WO2008001516A1 - Operation link structure - Google Patents

Operation link structure

Info

Publication number
WO2008001516A1
WO2008001516A1 PCT/JP2007/055023 JP2007055023W WO2008001516A1 WO 2008001516 A1 WO2008001516 A1 WO 2008001516A1 JP 2007055023 W JP2007055023 W JP 2007055023W WO 2008001516 A1 WO2008001516 A1 WO 2008001516A1
Authority
WO
WIPO (PCT)
Prior art keywords
link
shaft
transmission
link side
unit
Prior art date
Application number
PCT/JP2007/055023
Other languages
French (fr)
Japanese (ja)
Inventor
Yozo Oka
Noboru Yamamoto
Sotoshi Nakatsuji
Takashi Nakagawa
Original Assignee
Yanmar Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yanmar Co., Ltd. filed Critical Yanmar Co., Ltd.
Priority to CN200780021885.1A priority Critical patent/CN101466567B/en
Publication of WO2008001516A1 publication Critical patent/WO2008001516A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles

Definitions

  • the present invention relates to an operation link structure applied to a work vehicle such as a tractor.
  • Transmission devices such as a forward / reverse switching mechanism and a transmission mechanism in which an artificial operation member such as an operation lever provided in the vicinity of a driver's seat is inserted in a transmission path extending from a drive source to an output unit such as a drive axle
  • An operation link structure that is linked and linked to a structure via a link mechanism to bring the transmission mechanism into a transmission state corresponding to the artificial operation to the artificial operation member is widely used in work vehicles such as tractors. .
  • Patent Document 1 includes a link mechanism that interlocks and links a control shaft of an HST supported by a transmission case and a shift operation lever in which a grip portion protrudes laterally from the dashboard.
  • the operation link structure is described.
  • the link mechanism is simply a series of the various link members constituting the link mechanism.
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-160545
  • the present invention has been made in view of the above prior art, and connects a transmission mechanism that can change a transmission state from a drive source to an output unit and an artificial operation member for operating the transmission mechanism.
  • An object of the present invention is to provide an operation link structure that is linked dynamically and that can improve the work efficiency during assembly and maintenance.
  • the present invention is configured so that a transmission mechanism capable of changing a transmission state from a drive source to an output unit and an artificial operation member for operating the transmission mechanism are linked to each other.
  • An operation link structure applied to a work vehicle wherein the transmission link structure is connected to a switching operation portion of the transmission mechanism and is supported by a first unit including the transmission mechanism and a transmission housing that houses the transmission mechanism.
  • the first operation link mechanism has a first link side operation shaft disposed along a substantially vertical direction so as to be rotatable around an axis
  • the second operation link mechanism includes the first operation link mechanism, A second link side operation shaft that rotates about an axis in response to a human operation on the artificial operation member, the first link side operation shaft in a state where the lower end portion faces the upper end portion of the first link side operation shaft.
  • it may have a second link side operation shaft that is connected so as not to be relatively rotatable around the axis and to be detachable.
  • the first unit houses a forward / reverse switching mechanism that functions as the transmission mechanism, a speed change mechanism that functions as another transmission mechanism, the forward / reverse switching mechanism, and the speed change mechanism.
  • the transmission unit includes the transmission housing, and the second unit includes an engine that functions as the drive source, a steering unit including a steering column, a steering shaft, and a steering wheel, and a dash that surrounds the steering column.
  • a fuel tank including a dashboard section including a board body, an operation lever section including a forward / reverse switching lever that operates as the artificial operation member, an operation pedal section including a brake pedal, and a fuel tank serving as a fuel source of the engine
  • the engine unit is equipped with a part.
  • the first link side operation shaft is a first link provided in the transmission housing.
  • the second link side operation shaft is directly or indirectly supported by the second link side support member provided on the steering column. It is supported so as to be rotatable around its axis.
  • the first and second link-side operation shafts have the first and second units relative to the vehicle front-rear direction.
  • it can be configured to be able to take an axial coincidence state in which the respective axes are coaxially positioned and a separated state in which the respective axes are displaced.
  • the connecting operation and the separating operation of the first and second operation link mechanisms can be easily performed.
  • the upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft are configured to overlap in a side view when the axes coincide with each other.
  • the first and second link side operation shafts can be connected so as not to rotate relative to each other around the axis.
  • connection work and the separation work of the first and second operation link mechanisms can be performed more easily.
  • one of the upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft has a concave shape having a pair of support plates facing each other through a slit that opens in the horizontal direction.
  • a member is provided.
  • a convex member disposed between the pair of support plates via the slit is provided on the other of the upper end of the first link side operation shaft and the lower end of the second link side operation shaft.
  • the transmission mechanism In the case where the transmission mechanism is configured to be in a neutral state in which power transmission to the output power unit is interrupted, it is preferable that the transmission mechanism be in a neutral state.
  • the slit When the artificial operation member is positioned at the position, the slit is in the vehicle longitudinal direction. May be configured to face.
  • the connecting operation and the separating operation of the first and second operation link mechanisms can be performed more easily.
  • the dashboard main body may be supported by a dashboard stay coupled to the engine.
  • the first and second link side operation shafts are above the upper surface of the transmission housing and below the dashboard stay and the dashboard body, and Force can be connected by the fastening member in an accessible position.
  • a first link side support member that rotatably supports the first link side operation shaft about an axis and a dashboard stay provided in the second unit are detachably connected via a fastening member. With this configuration, it is possible to achieve posture stability of the first link side support member and the dashboard stay.
  • the first link side support member includes a bottom plate fixed to an upper surface of the transmission housing, a main body including a pair of side plates extending upward from the bottom plate, and the first link side support member so as to be positioned on the front side of the main body. And a bearing portion supported by the main body portion.
  • the pair of side plates can be detachably coupled to the pair of side plates of the dashboard stay via a fastening member.
  • FIG. 1 is a left side view of a tractor to which an embodiment of an operation link structure according to the present invention is applied.
  • FIG. 2 is a right side view of the tractor shown in FIG.
  • FIG. 3 is a longitudinal side view of a transmission portion in the tractor shown in FIGS. 1 and 2.
  • FIG. 4 is an exploded perspective view of the tractor shown in FIGS. 1 and 2.
  • FIG. 5 is a perspective view of the engine unit in the tractor as viewed from the left rear, showing a state in which the dashboard portion is removed.
  • FIG. 6 is a perspective view of the engine unit as viewed from the right rear, showing the state where the dashboard portion is removed.
  • FIG. 7 is a partially enlarged perspective view of the engine unit.
  • FIG. 8 is an enlarged perspective view of the vicinity of the dashboard stay in the engine unit, showing a state in which the dashboard portion is removed.
  • FIG. 9 is an enlarged right side view of the vicinity of the driver's seat in the tractor.
  • FIG. 10 is a schematic view of a throttle operation link mechanism provided in the tractor.
  • FIG. 11 is a cross-sectional view taken along line XI-XI in FIG.
  • FIG. 12 is a rear perspective view of the front unit in the tractor.
  • FIG. 13 is a cross-sectional view taken along the line ⁇ - ⁇ in FIG.
  • FIG. 14 is a left perspective view of the assembly in which the engine unit and the transmission unit are connected, and shows a state in which some members are deleted to clearly show the operation link structure.
  • FIG. 15 is a right perspective view of an assembly formed by connecting the engine unit and the transmission unit, and shows a state in which some members are deleted to clearly show the operation link structure. .
  • FIG. 16 is a front view of the operation link structure.
  • FIG. 17 is a perspective view of the operation link structure.
  • FIG. 18 is a perspective view in the vicinity of the first link side first operation shaft in the operation link structure.
  • FIG. 19 is a left side view of an assembly made by connecting the engine unit and the transmission unit.
  • FIG. 20 is a perspective view of the vicinity of a second link side support member in the operation link structure.
  • FIG. 21 is a cross-sectional view of the coupling mechanism in the operation link structure, showing a cross section along the axis of the second link side operation shaft.
  • FIG. 22 is a left side view of the engine unit and the transmission unit separated from each other.
  • FIGS. 1 and 2 are a left side view and a right side view of the tractor 1 to which the operation link structure according to the present embodiment is applied, respectively.
  • the tractor 1 is configured to transmit power from the drive source 10 to the output unit 30 via the transmission unit 20.
  • the tractor 1 has a drive axle 31 and a PTO shaft (not shown) as the output unit 30!
  • the transmission unit 20 is configured to transmit the power from the drive source 10 to the drive axle 31 and also to the PTO shaft.
  • FIG. 3 shows a vertical side view of the transmission unit 20.
  • the transmission unit 20 includes a traveling system transmission mechanism 210 that transmits power from the drive source 10 to the drive axle 31, and power from the drive source 10 to the PTO.
  • a PTO transmission mechanism 280 that transmits to the shaft, and a transmission housing 290 that houses the traveling transmission mechanism 210 and the PTO transmission mechanism 280 are provided.
  • the transmission unit 20 further includes a clutch mechanism 200 on the upstream side of the traveling transmission mechanism 210 and the PTO transmission mechanism 280 in the transmission direction.
  • the clutch mechanism 200 includes a clutch body 201 operatively connected to the drive source 10 and a driving shaft 202 operatively connected to the output side of the clutch body 201.
  • the clutch body 201 is operatively connected to the drive source 10 via a flywheel 15.
  • the clutch source 201 is moved from the drive source 10 to the driving shaft 202 in response to an operation of the clutch pedal 155 provided near the driver's seat. It is configured to be able to engage or shut off the power transmission.
  • the traveling transmission mechanism 210 and the PTO transmission mechanism 280 are connected in parallel to the driving shaft 202 as shown in FIG.
  • the traveling transmission mechanism 210 includes a forward / reverse switching mechanism 220 operatively connected to the driving shaft 202, a main transmission mechanism 240 operatively connected to the forward / reverse switching mechanism 220, and the main transmission mechanism 240. And a differential mechanism (not shown) that differentially transmits the rotational power from the left and right main drive axles.
  • An auxiliary transmission mechanism may be provided between the main transmission mechanism and the differential gear mechanism according to specifications.
  • the forward / reverse switching mechanism 220 includes a drive shaft 221 operatively connected to the drive shaft 202, a driven shaft 222 disposed substantially parallel to the drive shaft 221, the drive shaft 221 and the driven shaft.
  • a forward / reverse switching shifter 224 configured to be able to take a forward rotation position for rotating 222 forward or a reverse rotation position for reversely rotating the driven shaft 222 via the reverse gear train 223R.
  • the forward / reverse switching shifter 224 can take a neutral position in which power transmission from the drive shaft 221 to the driven shaft 222 is interrupted in addition to the forward rotation position and the reverse rotation position.
  • the forward / reverse switching shifter 224 is operatively connected to a manually operated forward / reverse switching operation member 131 provided near the driver's seat via a forward / reverse switching operation mechanism 230 and a forward / reverse switching operation link mechanism 500, which will be described later.
  • the shifter 224 can selectively take the forward rotation position, the neutral position, or the reverse rotation position in accordance with the manual operation of the forward / reverse switching member 131.
  • the main transmission mechanism 240 shifts the rotation of the driven shaft 222 in multiple stages, and the subsequent transmission It is configured to be able to transmit to the differential gear mechanism.
  • the main transmission 240 includes a main input shaft 241, a main output shaft 242 disposed substantially parallel to the main input shaft 241, the main input shaft 241, And a gear transmission 250 that performs multi-stage shifting between the main output shafts 242.
  • the main input shaft 241 is operatively connected to the driven shaft 222 via a gear train 245.
  • the gear transmission 250 includes a plurality of main transmission gear trains 251a to 251d supported by the main input shaft 241 and the main output shaft 242 and one of the main transmission gear trains 251a to 251d.
  • the main output shaft 242 is connected to the main input shaft 241 and main shift shifters 255a to 255c are provided.
  • the gear transmission 250 is added to a gear stage that rotates the main output shaft 242 through the main transmission gear trains 2 51a to 255e.
  • a shift stage for directly connecting the main output shaft 242 to the driven shaft 222 is provided.
  • the main output shaft 242 is rotatable about the axis on the same axis as the driven shaft 222.
  • the main transmission shifter 255a transmits the rotation of the main input shaft 241 to the main output shaft 242 via the corresponding main transmission gear train 25la, and transmits the main output shaft 242 to the driven shaft. It is configured so that it can be connected directly to 222! RU
  • the main transmission shifters 255a to 255c are operatively connected to a main transmission lever 265 (see FIG. 4 below) provided near the driver's seat via a main transmission operation mechanism 260.
  • the differential mechanism may be configured to differentially transmit the rotational power from the main output shaft 242 to the pair of left and right main drive axles 31.
  • a pair of left and right brake mechanisms (not shown) are provided between the differential gear mechanism and the pair of main drive axles 31.
  • the pair of brake mechanisms are operatively connected to a pair of left and right brake pedals 158L and 158R provided near the driver's seat via an appropriate link mechanism.
  • the traveling transmission mechanism 210 may further include a sub-drive axle (for example, a front axle).
  • An auxiliary drive axle output mechanism (not shown) that outputs rotational power toward the shaft 32 (see FIGS. 1 and 2) may be provided.
  • the sub-drive axle output mechanism includes a sub-drive axle output shaft and a clutch that engages or interrupts power transmission from the main output shaft 242 to the sub-drive axle output shaft based on an external operation. obtain.
  • the PTO transmission mechanism 280 includes a PTO transmission shaft 281 operatively connected to the driving shaft 202, and a PTO clutch mechanism (not shown) interposed between the PTO transmission shaft 281 and the PTO shaft. And a PTO transmission mechanism (not shown).
  • the PTO clutch mechanism is configured to selectively engage or block power transmission from the PTO transmission shaft 281 to the PTO shaft based on an external operation.
  • the PTO speed change mechanism is configured to change the rotational power transmitted from the PTO transmission shaft 281 to the PTO shaft based on an external operation.
  • the transmission housing 290 is hollow so as to accommodate the clutch mechanism 200, the traveling transmission mechanism 210, and the PTO transmission mechanism 280.
  • the transmission housing 290 includes a clutch housing 291 that houses the flywheel 15 and the clutch mechanism 200, a front housing that houses the forward / reverse switching mechanism 220 and the main transmission mechanism 240. And a rear housing 294 that accommodates the differential mechanism, and the clutch housing 291, the front housing 292, and the rear housing 294 are connected in series with each other.
  • the transmission housing 290 includes an intermediate housing 293 (see FIG. 4 below) between the front housing 292 and the rear housing 294.
  • FIG. 4 shows an exploded perspective view of the tractor 1.
  • the tractor 1 is assembled by connecting a plurality of previously assembled units Ul to U5.
  • the tractor 1 includes an engine that functions as the drive source 10.
  • a unit U2 a transmission unit Ul constituting the transmission unit 20, a front unit U3 including front axle cases 52L and 52R, a step 'fender unit U4, and a bonnet unit U5!
  • FIG. 5 and 6 show a perspective view of the engine unit U2 as viewed from the left rear and a perspective view as viewed from the right rear, respectively.
  • FIG. 7 shows an enlarged left perspective view of the engine unit U2. 5 and 6 show a state in which the following dashboard 120 is removed.
  • the engine unit U2 includes the engine 10, a steering unit 110, a dashboard unit 120, an operation lever unit 130, and an operation pedal unit. 150, a bonnet support part 170, and a fuel tank part 180.
  • the engine unit U2 further includes a dashboard stay 100 connected to the rear surface of the engine 10, and the steering unit 110 is connected to the engine 10 via the dashboard door stay 100. It is supported.
  • FIG. 8 shows an enlarged perspective view of the vicinity of the dashboard stay 100.
  • FIG. 8 shows a state in which the dashboard 120 is removed.
  • the dashboard stay 100 is provided with a mounting plate 101 connected to the rear surface of the engine in a substantially vertical direction along the vehicle width direction, and a substantially vertical direction along the vehicle front-rear direction. In this state, it has a pair of left and right support plates 102a, 102b extending from the mounting plate 101 to the rear side.
  • the mounting plate 101 is wider than the engine 10 in the vehicle width direction. A lower end portion of a portion of the mounting plate 101 that protrudes outward in the vehicle width direction from the engine 10 is supported by reinforcing plates 109 respectively connected to both side surfaces of the engine 10.
  • the steering section 110 is connected to a valve block 111 connected between the rear portions of the pair of support plates 102a and 102b, and extends substantially vertically.
  • a hollow steering column 112 having an end portion connected to the valve block 111 and a lower end portion operatively connected to a power steering valve (not shown) provided in the valve block 111 are connected to the steering column 112.
  • Interpolated steering shaft And a steering wheel 114 connected to the upper end portion of the steering shaft 113 so as not to rotate relative to the steering shaft 113.
  • the dashboard portion 120 is attached to the dashboard body 121 supported by the dashboard stay 100 and the dashboard body 121 so as to surround the steering column 112. And an instrument panel 122.
  • the operation lever portion 130 includes the forward / reverse switching operation member 131 in the form of a lever, and a throttle lever 141 for operating the governor 11 of the engine 10. Is included.
  • the forward / reverse switching operation member 131 is operatively connected to the forward / reverse switching shifter 224 through a forward / reverse switching operation mechanism 230, which will be described in detail later, and an operation link structure 500 according to the present embodiment.
  • FIG. 9 shows a right side view of the vicinity of the driver seat of the tractor 1.
  • the throttle lever 141 is indirectly supported by the dashboard stay 100.
  • a throttle lever stay 140 is connected to the dashboard stay 100 !.
  • the throttle lever stay 140 includes a side plate 140a having a front end connected to the mounting plate 101 of the dashboard stay 100, and a rear end force of the side plate 140a extending inward in the vehicle width direction.
  • the rear plate 140b connected to the right support plate 101b has a substantially L shape in plan view.
  • the throttle lever 141 includes a base end portion 142 along the vehicle width direction and a gripping portion extending substantially upward from the vehicle width direction outer end portion of the base end portion 142. And 143.
  • the base end 142 is supported at its inner end in the vehicle width direction by the side plate 140b of the throttle lever stay 140 so as to be rotatable about its axis, and at the outer end in the vehicle width direction below the dashboard board 121.
  • the dashboard body 121 is positioned outside the dashboard body 121 in the vehicle width direction.
  • the grip portion 143 is more outward in the vehicle width direction than the dashboard body 121, The upper end extends to the vicinity of the steering wheel 114.
  • the throttle lever 141 is operatively connected to the governor 11 via the throttle operation link mechanism 300 as shown in FIGS.
  • the governor 11 is configured to be operated by a throttle pedal 330 in addition to the throttle lever 141.
  • FIG. 10 shows a schematic diagram of the throttle operation link mechanism 300.
  • FIG. 11 is a sectional view taken along line XI-XI in FIG.
  • the throttle operation link mechanism 300 includes a lever-side operation member 301 provided at the base end 142 of the throttle lever 141 so as not to rotate relative to the throttle lever 141, and the throttle lever 141.
  • An actuating member 305 that is rotatable about an axis with respect to the base end 142, a governor side link member 310 that actuates and connects the actuating member 305 and the governor 11, and the actuating member 305 and the throttle.
  • a pedal-side link member 315 for operatively connecting the pedals 330 to each other.
  • the lever side operation member 301 includes a main body portion 302 that is relatively non-rotatable with a base end portion 142 of the throttle lever 141 outward from the side plate 140a of the throttle lever stay 140 in the vehicle width direction, And an operating piece 303 that extends inwardly in the vehicle width direction from the peripheral edge of the main body 302 beyond the side plate 140a.
  • the operating piece 303 is engaged with one side surface (a front end surface in the illustrated embodiment) of the operating member 305 disposed on the inner side in the vehicle width direction from the side plate 140a.
  • the throttle pedal 330 includes a base end portion 331 that is supported so as to be rotatable about an axis along the vehicle width direction, and the step fader from the base end portion 331.
  • the rod part 332 extending above the step part 41 in the unit U4, the pedal part 333 provided at the distal end part of the mouth part 332, and the pedal side which is relatively non-rotatable at the base end part
  • An arm portion 334 and a return spring 335 for urging the base end portion 331 toward one side around the axis are provided.
  • the return spring 335 has one end fixed and the other end connected to the pedal-side arm 334 below the step portion 41.
  • the pedal side link member 315 includes the operating member 305 and the pedal side arm portion 3. 34 and a pedal side rod extending between the two.
  • the governor side link member 310 includes a governor side rod extending between the actuating member 305 and the governor 11.
  • the throttle operation link mechanism 300 includes a friction member 320 between the side plate 140a of the throttle lever stay 140 and the lever side operation member 301.
  • the friction member 320 generates a sliding resistance against the lever side operation member 302 so as to hold the position of the throttle lever 141 against the biasing force of the return spring 335.
  • the throttle operation link mechanism 300 having such a configuration operates as follows.
  • the operating piece 303 is located in a notch formed in the side plate 140a of the throttle lever stay 140, and the operating range of the operating piece 303 is defined by the notch. Therefore, the operating member 305 that swings around the lever rotation center R in the second direction R2 by the biasing force of the return spring 335 contacts the operating piece 303. This stops the movement in the second direction R2 around the lever rotation center R.
  • the initial position force is also shifted to the operation position via the pedal side link member 315 against the urging force of the return spring 335. Accordingly, the throttle lever 141 tends to be returned to the initial position by the return spring 335. As described above, the throttle lever 141 is not provided between the side plate 140a of the throttle lever stay 140 and the lever side operation member 301. The friction member 320 is provided.
  • the throttle lever 141 is held in the operating position by the friction member 320.
  • the throttle pedal 330 is depressed to operate only when the throttle pedal 330 is depressed.
  • the governor 11 can be placed in the operating position.
  • the governor 11 when the governor 11 is to be continuously positioned at the operating position, the throttle lever 141 is piled on the sliding resistance of the friction member 320 and the biasing force of the return spring 335 to set the initial position. By moving to the force operation position, the governor 11 can be held at the operation position even after the operation force to the throttle lever 141 is released.
  • the operation pedal portion 150 includes a hollow support member 151 supported by the dashboard tee 100 and a state in which both end portions extend outward.
  • the pedal shaft 152 inserted in the hollow support member 151, and a clutch boss 153 externally inserted in a relatively rotatable manner at one end side extension portion (the left end portion in the illustrated embodiment) of the pedal shaft 152.
  • a right brake boss 156R which is rotatably inserted, a left brake arm 157L supported by the left brake boss 156L, a left brake pedal 158L provided at a free end of the left brake arm 157L, and the right A right brake arm 157R supported by the brake boss 156R, and a right brake pedal 158R provided at the free end of the right brake arm 157R.
  • the clutch boss 153 is operatively connected to the clutch mechanism 200 via a clutch link mechanism (not shown).
  • a portion of the extended portion on one end side of the pedal shaft 152 that is located outwardly in the vehicle width direction from the clutch boss 153 is operatively connected to the left brake mechanism via a left brake link mechanism (not shown). Yes.
  • the right brake boss 157R is operatively connected to the right brake mechanism via a right brake link mechanism (not shown).
  • the bonnet support 170 has a bonnet support member 171 provided above the engine 10 as shown in FIGS.
  • the bonnet support member 171 has a rear portal shape having a pair of left and right vertical members 172 extending substantially in the vertical direction and a horizontal member 173 connecting between the upper ends of the pair of vertical members 172.
  • the fuel tank section 180 includes a fuel tank frame 181 provided above the engine 10, and a fuel supported by the fuel tank frame 181. With tank 182!
  • the fuel tank frame 181 extends in the vehicle front-rear direction between the pair of left and right vertical members 172, and the fuel tank 182 is inserted into the bonnet support member 171 in the fuel tank frame 181. It is supported.
  • the cap 183 of the fuel tank 182 can be accessed from the outside through an opening provided in the dashboard main body 121.
  • FIG. 12 shows a rear perspective view of the front unit U3.
  • the front unit U3 is detachably connected to the engine unit U2 via a pair of left and right connecting plates 5.
  • the front unit U2 includes a front body 50 that is forged, a front case 51 that is connected to the front body 50, and the front case.
  • Left and right front axle cases 52L, 52R respectively connected to the left and right side surfaces of 51, and a front weight (not shown) removably attached to a front weight mounting portion 53 provided at the front end of the front body 50,
  • a battery 54 supported by the front body 50 and a radiator (not shown) supported by a frame 55 provided on the front body 50 are provided.
  • the step fender unit U4 has a pair of left and right step 'fenders 40! /.
  • the step fender 40 is integrally provided with a step part 41 and a fender part 42.
  • the bonnet unit U5 has a hood 60 that is detachably connected to the bonnet support member 171.
  • the bonnet hood 60 is swingable to the bonnet support member 171 so as to be able to take a housing position covering the engine 10, the fuel tank 182 and the front unit U3 and an open position for opening them. It is connected.
  • FIG. 13 is a longitudinal front view of the transmission unit U1 taken along line ⁇ - ⁇ in FIG.
  • the forward / reverse switching operation mechanism 230 includes a fork shaft 231 disposed in the transmission housing 290 in a state substantially parallel to the drive shaft 221 and the driven shaft 222, A fork 232 having a base end portion slidably supported by the fork shaft 231 in an axial direction and a tip end portion engaged with the forward / reverse switching shifter 224, and one end portion positioned outside the transmission housing 290
  • the operation shaft 233 supported by the transmission housing 290 so as to be rotatable about the axis along the direction substantially orthogonal to the fork shaft 231 is connected to the base end portions of the operation shaft 233 and the fork 232.
  • An operating arm 234 and an operating arm 235 supported on the outwardly extending portion of the operating shaft 233 so as not to rotate relative to each other are provided.
  • the operation arm 235 includes the forward / reverse switching mechanism 220. Acts as a switching operation section for switching the operating state.
  • the fork 232 slides along the fork shaft 231, thereby the forward / reverse switching shifter 224. Is in the forward rotation position, neutral position or reverse rotation position.
  • the front housing 292 constituting the transmission housing 290 includes a front housing body 292a having an opening on the right side, and the A cap-like case member 292b detachably coupled to the front housing body 292a so as to close the opening.
  • the operation shaft 233 is supported by the case member 292b so as to be rotatable about its axis.
  • the operation link structure 500 is configured to operatively connect the switching operation portion 235 of the forward / reverse switching mechanism 220 and the forward / backward switching operation member 131 that can be manually operated.
  • FIGS. 14 and 15 show a left perspective view and a right perspective view of an assembly in which the engine unit U2 and the transmission unit U1 are connected. In FIGS. 14 and 15, some members are deleted so that the operation link structure 500 is clearly shown.
  • FIGS. 16 and 17 show a front view and a front perspective view of only the operation link structure 500, respectively.
  • the operation link structure 500 includes a first operation link mechanism 510 supported by the transmission unit U1 in a state of being connected to the switching operation unit 235, and the front link And a second operation link mechanism 550 supported by the engine unit U2 in a state of being connected to the reverse switching operation member 131.
  • the first and second operation link mechanisms 510 and 550 can be connected to and separated from each other while being supported by the corresponding units U1 and U2, respectively.
  • the operation link structure 500 the first operation link mechanism 510 is attached to the transmission gear U1
  • the second operation link mechanism 550 is attached to the engine unit U2.
  • the transmission unit Ul and the engine unit U2 can be connected or separated.
  • the first operation link mechanism 510 is disposed on the first link side substantially along the vertical direction while being rotatable about the axis.
  • the first operation shaft 511 is provided, and the first link side first operation shaft 511 rotates around the axis, whereby the operation shaft 233 is connected to the axis via the operation arm 235 acting as a switching operation unit. Rotating around! /
  • the first operation link mechanism 510 moves in the direction of its own axis according to the rotation of the first link side first operation shaft 511 and the first link side first operation shaft 511 around the axis.
  • the first link side first rod 513 operatively connected to the first link side first operating shaft 511 to move along the first link side first rod 513 and its own axis line according to the movement of the first link side first rod 513
  • the first link side second operating shaft 515 operatively connected to the first link side first rod 513 so as to rotate about the first link side and the first link side second operating shaft 515 are self-responsive to rotation around the axis.
  • the first link side second rod 517 is operatively connected to the first link side second operation shaft 515 so as to move along the axis of the first link side second rod 517. Operatively connected to arm 235.
  • the first link side first arm 512 is provided at the lower end portion of the first link side first operating shaft 511 so as not to be relatively rotatable.
  • first link side first rod 513 is operatively connected to the free end of the first link side first arm 512 and the other end is connected to the upper end of the first link side second operating shaft 515. It is operatively connected to a first link side second upper arm 514 provided so as not to rotate relative to the first link side.
  • the first link side first operating shaft 511 is disposed substantially vertically in the vicinity of the steering column 112 at the approximate center in the vehicle width direction of the transmission housing 290, as shown in FIG. .
  • the first link side second operation shaft 515 is disposed substantially along the vertical direction on the right side of the transmission housing 290, as shown in FIG. Therefore, the first link side first rod 513 is arranged along the vehicle width direction so that the first link side first and second operation shafts 51 1 and 515 can be operatively connected.
  • a first link side second lower arm 516 is provided at the lower end portion of the first link side second operation shaft 515 so as not to be relatively rotatable.
  • the first link side second rod 517 is arranged in the vehicle front-rear direction so that the free end portion of the first link side second lower arm 516 and the free end portion of the operation arm 235 can be operatively connected. Extending along.
  • FIG. 18 is a perspective view of the vicinity of the first link side first operating shaft 511.
  • the first link side first operating shaft 511 is supported by a first link side first support member 530 provided in the transmission housing 290 so as to be rotatable about its axis. It has been.
  • the first link side first support member 530 includes a main body portion 531 including a bottom plate fixed to the upper surface of the transmission housing 290 and a pair of side plates extending upward from the bottom plate, and a front portion of the main body portion 531. And a bearing portion 535 supported by the main body portion 531 so as to be positioned on the side.
  • the first link side first operating shaft 511 is supported by the bearing portion 535 so as to be rotatable about the axis line with the upper end portion and the lower end portion extending outward.
  • FIG. 19 shows a left side view of an assembly obtained by connecting the engine unit U2 and the transmission unit U1.
  • the pair of side plates in the main body 531 are respectively connected to the pair of side plates 102a, 102b in the dashboard stay 100 via fastening members 533 such as bolts and nuts. And can be detachably connected.
  • both the dashboard stay 100 and the first link side first support member 530 can be stabilized.
  • the second operation link mechanism 550 has a second link side operation shaft 551 that rotates around the axis line in response to an artificial operation to the forward / reverse switching operation member 131. is doing.
  • the second link side operation shaft 551 includes the transmission unit U1 and the engine unit U2. Are connected to each other so that the lower end portion of the first link side first operating shaft 511 faces the upper end portion of the first link side first operation shaft 511 so that the lower end portion is relatively non-rotatable and detachable. .
  • the first link side operation shaft 551 is operated in response to an artificial operation to the forward / reverse switching operation member 131. 1
  • the operation shaft 511 rotates around the axis, and the operation arm 235 acting as a switching operation portion swings around the operation shaft 233.
  • the second operation link mechanism 550 supports the second link side operation shaft 551 and the second link side operation shaft 551 directly or indirectly in a state of being freely rotatable about an axis.
  • a link-side support member 560 supports the second link side operation shaft 551 and the second link side operation shaft 551 directly or indirectly in a state of being freely rotatable about an axis.
  • FIG. 20 is a perspective view of the vicinity of the second link side support member 560.
  • the second link side support member 560 supports the second link side operation shaft 551 while being fixed to the steering column 112. It is configured as follows.
  • the second link side support member 560 includes a base portion 561 connected to the steering column 112, and a support portion 562 extending laterally from the base portion 561.
  • the second link side operation shaft 551 is supported so as to be rotatable about an axis via a bearing member 565 provided on the support member 562.
  • the second operation link mechanism 550 rotates the second link side operation shaft 511 around the axis in response to an artificial operation to the forward / reverse switching operation member 131.
  • a connecting mechanism 600 capable of locking the forward / reverse switching operation member 131 in the neutral position.
  • the forward / reverse switching operation member 131 includes a reference shaft portion 132 that is coaxially opposed to the second link side operation shaft 551, and extends obliquely upward from the upper end of the reference shaft portion 132.
  • the operation shaft portion 133 is provided.
  • the operation shaft portion 133 has a free end portion extending outward from the dashboard 120 (see FIG. 7 and the like). That is, when the user grasps and operates the free end portion of the operation shaft portion 133, the forward / reverse switching operation member 131 rotates around the axis of the reference shaft portion 132.
  • the coupling mechanism 600 couples the forward / reverse switching operation member 131 so that the second link side operation shaft 551 rotates about the axis by rotation of the reference shaft portion 132 about the axis. Further, the connecting mechanism 600 is configured to exhibit a detent action for holding the forward / reverse switching operation member 131 in a neutral position.
  • FIG. 21 is a longitudinal sectional view of the coupling mechanism 600 taken along the axis of the second link side operation shaft 551.
  • the connection mechanism 600 includes a link side connection member 610 that is connected to the upper end portion of the second link side operation shaft 551 so as not to rotate relative to the axis.
  • the link side connecting member 610 has a hollow portion 611 that is extrapolated to the upper end portion of the second link side operation shaft 511 so as not to be relatively rotatable, and the hollow portion 611 so as to face each other with the hollow portion 611 interposed therebetween.
  • a pair of support plate portions 612 connected to the portion 611.
  • the coupling mechanism 600 includes a pivot shaft 620 supported by the pair of support plate portions 612 so as to intersect the axis of the second link side operation shaft 551, and the forward / reverse switching operation member 13. 1 is fixed to the reference shaft portion 132, and is extended radially outward to the bearing portion 630 externally attached to the pivot shaft 620 and the reference shaft portion 132 of the forward / reverse switching operation member 131.
  • a detent piece 640 provided to be present, a guide hole 650 through which the detent piece 640 is inserted, and a neutral holding spring that urges the forward / reverse switching operation member 131 to one side around the pivot 620 It is equipped with 660.
  • the guide hole 650 allows the detent piece 640 to swing around the reference shaft portion 132 when the forward / reverse switching operation member 131 rotates about the axis of the reference shaft portion 132.
  • the size is such that you get.
  • the detent piece 640 can be engaged with the guide hole 650 at a position facing the detent piece 640 when the forward / reverse switching operation member 131 is positioned at the neutral position.
  • a slit 651 of a certain size is formed.
  • the neutral holding spring 660 urges the bearing portion 630 in a direction in which the detent piece 640 is engaged with the slit 651.
  • connection mechanism 600 having such a configuration operates as follows.
  • the forward / reverse switching operation member 131 When the forward / reverse switching operation member 131 is positioned at a neutral position around the axis of the reference shaft portion 132, and when the forward / reverse switching operation member 131 is not subjected to an artificial operation force, The detent piece 640 is engaged in the slit 651 by the neutral holding spring 660. In this state, the detent piece 640 is held so as not to rotate around the axis of the reference shaft portion 132. Therefore, the forward / reverse switching operation member 131 is held in the neutral position.
  • the neutral holding spring 660 is attached in the direction in which the detent piece 640 is detached from the slit 651.
  • the forward / reverse switching operation member 131 is swung about the pivot shaft 620 against the force.
  • the detent piece 640 can swing around the reference shaft 132 in the guide hole 650. Therefore, by rotating the forward / reverse switching operation member 131 around the axis of the reference shaft portion 132, the second link side operation shaft 551 rotates around the axis via the link side connecting member 610.
  • the opening width of the guide hole 650 (the opening length in the direction along the axis of the reference shaft portion 132) and the width of the detent piece 640 (the direction along the axis of the reference shaft portion 132) can be made substantially the same.
  • the forward / reverse switching operation member 131 around the reference shaft portion 132 can be stably rotated.
  • the guide hole 650 is formed in the base portion 561 of the second link side support member 560.
  • the opposing ends of the first link side first operating shaft 511 and the second link side operating shaft 551 are connected by a pin 540 that acts as a fastening member. And are detachably connected.
  • the first link side first operating shaft 511 and the second link side operating shaft 551 move the engine unit U2 and the transmission unit U1 relative to each other in the vehicle longitudinal direction. By doing so, they are arranged so that they can be in a state where the axes coincide with each other on the same axis and a separated state where the positions of the axes are displaced! RU
  • the upper end portion of the first link side first operation shaft 511 and the lower end portion of the second link side operation shaft 551 are configured to overlap in a side view when the axes coincide with each other.
  • the first link side first operation shaft 511 and the second link side operation shaft 551 are connected to each other so as not to rotate relative to each other around the axis by connecting the overlap portions with the pin 540, and the pin 540
  • the first link side first operating shaft 511 and the second link side second operating shaft 511 can be separated by removing (see FIG. 22).
  • a concave member 541 is provided at the lower end portion of the second link side operation shaft 551.
  • the concave member 541 has a pair of support plates 542 facing each other via a slit 543 that opens in the horizontal direction.
  • the first link side first operation shaft 511 is interposed between the pair of support plates 542 via the slit 543.
  • a convex member 545 is provided.
  • the slit 543 may be configured to face the vehicle longitudinal direction.
  • the engine unit U2 and the transmission unit U1 can be connected and separated in a state where the forward / reverse switching mechanism 220 is in a neutral state.
  • the first operation link mechanism 510 may further include a first link side second support member 520 that supports the first link side second operation shaft 515 so as to be rotatable about an axis (see FIG. 15 See).
  • the first link side second support member 520 is fixed to the right side surface of the transmission housing 290 in a state where the first link side second operation shaft 515 is inserted.
  • the second link side operation shaft 551, the first link are linked to the manual operation to the forward / reverse switching operation member 131.
  • the link side first operation shaft 511 and the first link side second operation shaft 515 rotate around the axis.
  • the second link side operation shaft 551 is supported by the second link side support member 560 so as to be rotatable about its axis
  • the first link side first operation shaft 511 is the first link side first shaft. 1 Supported by a support member 530 so as to be rotatable about its axis.
  • first link side second operation shaft 515 by supporting the first link side second operation shaft 515 by the first link side second support member 520, a link member that rotates about the axis (that is, the first link side first operation shaft 511, The first link-side second operation shaft 515 and the second link-side operation shaft 551) are all supported so as to be rotatable about the axis, and thereby the operation link structure interlocked with the forward / reverse switching operation member 131. 500 operation stability can be achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Control Devices (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

To provide an operation link structure enabling an increase in working efficiency during the assembly and maintenance. The operation link structure comprises a first operation link mechanism supported on a first unit having a transmission mechanism and a transmission housing for storing the transmission mechanism in the state that the first operation link mechanism is connected to the switchover operation part of the transmission mechanism; and a second operation link mechanism supported on a second unit having a manual operation member in the state that the second operation link mechanism is connected to the manual operation member. The first and second operation link mechanisms are detachably connected to each other while being supported on their corresponding first and second units.

Description

明 細 書  Specification
操作リンク構造  Operation link structure
技術分野  Technical field
[0001] 本発明は、トラクタ等の作業車輛に適用される操作リンク構造に関する。  The present invention relates to an operation link structure applied to a work vehicle such as a tractor.
背景技術  Background art
[0002] 運転席近傍に備えられた操作レバー等の人為操作部材を、駆動源カゝら駆動車軸 等の出力部へ至る伝動経路に介挿された前後進切替機構や変速機構等の伝動機 構にリンク機構を介して連動連結し、前記伝動機構を前記人為操作部材への人為操 作に応じた伝動状態とさせる操作リンク構造は、トラクタ等の作業車輛にぉ 、て広く 利用されている。  [0002] Transmission devices such as a forward / reverse switching mechanism and a transmission mechanism in which an artificial operation member such as an operation lever provided in the vicinity of a driver's seat is inserted in a transmission path extending from a drive source to an output unit such as a drive axle An operation link structure that is linked and linked to a structure via a link mechanism to bring the transmission mechanism into a transmission state corresponding to the artificial operation to the artificial operation member is widely used in work vehicles such as tractors. .
しカゝしながら、従来の操作リンク構造は、組立時及びメンテナンス時の作業効率とい う観点では十分な考慮がなされて 、なかった。  However, the conventional operation link structure has not been sufficiently considered from the viewpoint of work efficiency during assembly and maintenance.
[0003] 即ち、例えば、下記特許文献 1には、ミッションケースに支持された HSTの制御軸と 把持部がダッシュボードから側方へ突出された変速操作レバーとを連動連係するリン ク機構を備えた操作リンク構造が記載されて ヽる。 [0003] That is, for example, Patent Document 1 below includes a link mechanism that interlocks and links a control shaft of an HST supported by a transmission case and a shift operation lever in which a grip portion protrudes laterally from the dashboard. The operation link structure is described.
し力しながら、この従来の操作リンク構造においては、前記リンク機構は該リンク機 構を構成する種々のリンク部材が単に直列に連結されているだけである。  However, in this conventional operation link structure, the link mechanism is simply a series of the various link members constituting the link mechanism.
従って、前記ミッションケースや前記ダッシュボード内に配設されるステアリングコラ ムを車輛本体に設置して力 でな 、と、前記リンク機構の組み立てを行うことができず 、車輛の組立作業効率が悪いという問題があった。  Therefore, the link mechanism cannot be assembled, and the vehicle assembly work efficiency is poor, because the transmission case and the steering column disposed in the dashboard cannot be assembled with force. There was a problem.
さらに、メンテナンス時においては、前記リンク機構を個々のリンク部材のレベルに まで分解しないと、前記ミッションケースを車輛本体力 分離させることができず、メン テナンス時の作業効率も悪 、と 、う問題があった。  Furthermore, during maintenance, if the link mechanism is not disassembled to the level of each link member, the transmission case cannot be separated from the vehicle body force, and the work efficiency during maintenance is poor. was there.
特許文献 1 :特開 2002— 160545号公報  Patent Document 1: Japanese Patent Laid-Open No. 2002-160545
発明の開示  Disclosure of the invention
[0004] 本発明は、前記従来技術に鑑みなされたものであり、駆動源から出力部への伝動 状態を変更させ得る伝動機構と前記伝動機構を操作する為の人為操作部材とを連 動連係する操作リンク構造であって、組立時及びメンテナンス時の作業効率を向上さ せ得る操作リンク構造の提供を、一の目的とする。 [0004] The present invention has been made in view of the above prior art, and connects a transmission mechanism that can change a transmission state from a drive source to an output unit and an artificial operation member for operating the transmission mechanism. An object of the present invention is to provide an operation link structure that is linked dynamically and that can improve the work efficiency during assembly and maintenance.
[0005] 本発明は、前記目的を達成するために、駆動源から出力部への伝動状態を変更さ せ得る伝動機構と前記伝動機構を操作する為の人為操作部材とを連動連係するよう に作業車輛に適用される操作リンク構造であって、前記伝動機構の切替操作部に連 結された状態で、該伝動機構及び該伝動機構を収容する伝動ハウジングを含む第 1 ユニットに支持された第 1操作リンク機構と、前記人為操作部材に連結された状態で 、該人為操作部材を含む第 2ユニットに支持された第 2操作リンク機構とを備え、前記 第 1及び第 2操作リンク機構は対応する前記ユニットに支持されたままで互いに対し 着脱可能に連結される操作リンク構造を提供する。  [0005] In order to achieve the above object, the present invention is configured so that a transmission mechanism capable of changing a transmission state from a drive source to an output unit and an artificial operation member for operating the transmission mechanism are linked to each other. An operation link structure applied to a work vehicle, wherein the transmission link structure is connected to a switching operation portion of the transmission mechanism and is supported by a first unit including the transmission mechanism and a transmission housing that houses the transmission mechanism. A first operation link mechanism, and a second operation link mechanism supported by a second unit including the artificial operation member in a state of being connected to the artificial operation member, the first and second operation link mechanisms corresponding to each other. There is provided an operation link structure that is detachably connected to each other while being supported by the unit.
斯かる構成の本発明によれば、作業車輛の組立作業効率及びメンテナンス作業効 率を向上させることができる。  According to the present invention having such a configuration, it is possible to improve the assembly work efficiency and the maintenance work efficiency of the work vehicle.
[0006] 好ましくは、前記第 1操作リンク機構は、軸線回り回転可能な状態で略上下方向に 沿って配設された第 1リンク側操作軸を有し、前記第 2操作リンク機構は、前記人為 操作部材への人為操作に応じて軸線回りに回転する第 2リンク側操作軸であって、 下端部が前記第 1リンク側操作軸の上端部と対向した状態で該第 1リンク側操作軸に 対して軸線回り相対回転不能に且つ着脱可能に連結される第 2リンク側操作軸を有 し得る。 [0006] Preferably, the first operation link mechanism has a first link side operation shaft disposed along a substantially vertical direction so as to be rotatable around an axis, and the second operation link mechanism includes the first operation link mechanism, A second link side operation shaft that rotates about an axis in response to a human operation on the artificial operation member, the first link side operation shaft in a state where the lower end portion faces the upper end portion of the first link side operation shaft. On the other hand, it may have a second link side operation shaft that is connected so as not to be relatively rotatable around the axis and to be detachable.
[0007] 一態様においては、前記第 1ユニットは、前記伝動機構として作用する前後進切換 機構と、他の伝動機構として作用する変速機構と、前記前後進切換機構及び前記変 速機構を収容する前記伝動ハウジングとを備えた伝動ユニットとされ、且つ、前記第 2ユニットは、前記駆動源として作用するエンジンと、ステアリングコラム，ステアリング シャフト及びステアリングホイールを含むステアリング部と、前記ステアリングコラムを 囲繞するダッシュボード本体を含むダッシュボード部と、前記人為操作部材として作 用する前後進切替レバーを含む操作レバー部と、ブレーキペダルを含む操作ペダル 部と、前記エンジンの燃料源となる燃料タンクを含む燃料タンク部とを備えたエンジン ユニットとされる。  [0007] In one aspect, the first unit houses a forward / reverse switching mechanism that functions as the transmission mechanism, a speed change mechanism that functions as another transmission mechanism, the forward / reverse switching mechanism, and the speed change mechanism. The transmission unit includes the transmission housing, and the second unit includes an engine that functions as the drive source, a steering unit including a steering column, a steering shaft, and a steering wheel, and a dash that surrounds the steering column. A fuel tank including a dashboard section including a board body, an operation lever section including a forward / reverse switching lever that operates as the artificial operation member, an operation pedal section including a brake pedal, and a fuel tank serving as a fuel source of the engine The engine unit is equipped with a part.
[0008] 好ましくは、前記第 1リンク側操作軸は、前記伝動ハウジングに設けられた第 1リンク 側支持部材によって直接的又は間接的に軸線回り回転自在に支持され、且つ、前 記第 2リンク側操作軸は、前記ステアリングコラムに設けられた第 2リンク側支持部材 によって直接的又は間接的に軸線回り回転自在に支持される。 [0008] Preferably, the first link side operation shaft is a first link provided in the transmission housing. The second link side operation shaft is directly or indirectly supported by the second link side support member provided on the steering column. It is supported so as to be rotatable around its axis.
[0009] 前記第 1及び第 2ユニットが車輛前後方向に沿って連結される態様においては、前 記第 1及び第 2リンク側操作軸は、前記第 1及び第 2ユニットを車輛前後方向に相対 移動させることによって、互いの軸線が同軸上に位置する軸線一致状態と、互いの 軸線が変位された分離状態とをとり得るように構成され得る。  In the aspect in which the first and second units are connected along the vehicle front-rear direction, the first and second link-side operation shafts have the first and second units relative to the vehicle front-rear direction. By moving, it can be configured to be able to take an axial coincidence state in which the respective axes are coaxially positioned and a separated state in which the respective axes are displaced.
斯かる構成によれば、前記第 1及び第 2操作リンク機構の連結作業及び分離作業 を容易に行うことができる。  According to such a configuration, the connecting operation and the separating operation of the first and second operation link mechanisms can be easily performed.
[0010] より好ましくは、前記第 1リンク側操作軸の上端部及び前記第 2リンク側操作軸の下 端部は、前記軸線一致状態の際に、側面視においてオーバーラップするように構成 され、前記オーバーラップ部分を締結部材によって連結することで、前記第 1及び第 2リンク側操作軸が軸線回り相対回転不能に連結され得る。  [0010] More preferably, the upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft are configured to overlap in a side view when the axes coincide with each other. By connecting the overlap portions with a fastening member, the first and second link side operation shafts can be connected so as not to rotate relative to each other around the axis.
斯かる構成によれば、前記第 1及び第 2操作リンク機構の連結作業及び分離作業 をより容易に行うことができる。  According to such a configuration, the connection work and the separation work of the first and second operation link mechanisms can be performed more easily.
[0011] 例えば、前記第 1リンク側操作軸の上端部及び前記第 2リンク側操作軸の下端部の 一方には、水平方向に開くスリットを介して互いに対向する一対の支持板を有する凹 状部材が設けられる。そして、前記第 1リンク側操作軸の上端部及び前記第 2リンク側 操作軸の下端部の他方には、前記スリットを介して前記一対の支持板の間に配置さ れる凸状部材が設けられる。前記凸状部材及び前記凹状部材が前記締結部材によ つて連結されることで、前記第 1及び第 2リンク側操作軸が軸線回り相対回転不能に 連結される。  [0011] For example, one of the upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft has a concave shape having a pair of support plates facing each other through a slit that opens in the horizontal direction. A member is provided. A convex member disposed between the pair of support plates via the slit is provided on the other of the upper end of the first link side operation shaft and the lower end of the second link side operation shaft. By connecting the convex member and the concave member by the fastening member, the first and second link side operation shafts are connected so as not to be relatively rotatable around the axis.
斯かる構成によれば、前記第 1及び第 2操作リンク機構の連結作業及び分離作業 の容易を図りつつ、連結状態での前記第 1及び第 2操作リンク機構の動作安定化を 図ることができる。  According to such a configuration, it is possible to stabilize the operation of the first and second operation link mechanisms in the connected state while facilitating the connection operation and the separation operation of the first and second operation link mechanisms. .
[0012] 前記伝動機構が、前記駆動源力 前記出力部への動力伝達を遮断する中立状態 をとり得るように構成されている場合には、好ましくは、前記伝動機構を中立状態とさ せる中立位置に前記人為操作部材を位置させた際に、前記スリットは車輛前後方向 を向くように構成され得る。 [0012] In the case where the transmission mechanism is configured to be in a neutral state in which power transmission to the output power unit is interrupted, it is preferable that the transmission mechanism be in a neutral state. When the artificial operation member is positioned at the position, the slit is in the vehicle longitudinal direction. May be configured to face.
斯かる構成によれば、前記第 1及び第 2操作リンク機構の連結作業及び分離作業 をより簡便に行うことができる。  According to such a configuration, the connecting operation and the separating operation of the first and second operation link mechanisms can be performed more easily.
[0013] 前記ダッシュボード本体は、前記エンジンに連結されたダッシュボードスティに支持 され得る。斯カる態様において、好ましくは、前記第 1及び第 2リンク側操作軸は、前 記伝動ハウジングの上面より上方で且つ前記ダッシュボードスティ及び前記ダッシュ ボード本体よりも下方であって、車輛側方力 アクセス可能な位置において、前記締 結部材によって連結され得る。 [0013] The dashboard main body may be supported by a dashboard stay coupled to the engine. In such an aspect, preferably, the first and second link side operation shafts are above the upper surface of the transmission housing and below the dashboard stay and the dashboard body, and Force can be connected by the fastening member in an accessible position.
[0014] 前記第 1リンク側操作軸を軸線回り回転自在に支持する第 1リンク側支持部材と、前 記第 2ユニットに備えられるダッシュボードスティとを、締結部材を介して着脱可能に 連結するように構成すれば、前記第 1リンク側支持部材及び前記ダッシュボードステ ィの姿勢安定ィ匕を図ることができる。  [0014] A first link side support member that rotatably supports the first link side operation shaft about an axis and a dashboard stay provided in the second unit are detachably connected via a fastening member. With this configuration, it is possible to achieve posture stability of the first link side support member and the dashboard stay.
[0015] 前記第 1リンク側支持部材は、前記伝動ハウジングの上面に固着された底板及び 該底板から上方へ延びる一対の側板を含む本体部と、前記本体部の前方側に位置 するように該本体部に支持された軸受部とを有し得る。斯カる態様において、好まし くは、前記一対の側板は、それぞれ、前記ダッシュボードスティにおける一対の側板 に締結部材を介して着脱可能に連結され得る。  [0015] The first link side support member includes a bottom plate fixed to an upper surface of the transmission housing, a main body including a pair of side plates extending upward from the bottom plate, and the first link side support member so as to be positioned on the front side of the main body. And a bearing portion supported by the main body portion. In such an aspect, preferably, the pair of side plates can be detachably coupled to the pair of side plates of the dashboard stay via a fastening member.
図面の簡単な説明  Brief Description of Drawings
[0016] [図 1]図 1は、本発明に係る操作リンク構造の一実施の形態が適用されたトラクタの左 側面図である。  FIG. 1 is a left side view of a tractor to which an embodiment of an operation link structure according to the present invention is applied.
[図 2]図 2は、図 1に示すトラクタの右側面図である。  FIG. 2 is a right side view of the tractor shown in FIG.
[図 3]図 3は、図 1及び図 2に示すトラクタにおける伝動部の縦断側面図である。  FIG. 3 is a longitudinal side view of a transmission portion in the tractor shown in FIGS. 1 and 2.
[図 4]図 4は、図 1及び図 2に示すトラクタの分解斜視図である。  FIG. 4 is an exploded perspective view of the tractor shown in FIGS. 1 and 2.
[図 5]図 5は、前記トラクタにおけるエンジンユニットを左後方力 視た斜視図であり、 ダッシュボード部を取り外した状態を示している。  FIG. 5 is a perspective view of the engine unit in the tractor as viewed from the left rear, showing a state in which the dashboard portion is removed.
[図 6]図 6は、前記エンジンユニットを右後方力 視た斜視図であり、前記ダッシュボ 一ド部を取り外した状態を示して ヽる。  [FIG. 6] FIG. 6 is a perspective view of the engine unit as viewed from the right rear, showing the state where the dashboard portion is removed.
[図 7]図 7は、前記エンジンユニットの部分拡大斜視図である。 [図 8]図 8は、前記エンジンユニットにおけるダッシュボードスティ近傍の拡大斜視図 であり、前記ダッシュボード部を外した状態を示して 、る。 FIG. 7 is a partially enlarged perspective view of the engine unit. [FIG. 8] FIG. 8 is an enlarged perspective view of the vicinity of the dashboard stay in the engine unit, showing a state in which the dashboard portion is removed.
[図 9]図 9は、前記トラクタにおける運転席近傍の右拡大側面図である。  FIG. 9 is an enlarged right side view of the vicinity of the driver's seat in the tractor.
[図 10]図 10は、前記トラクタに備えられたスロットル操作リンク機構の模式図である。  FIG. 10 is a schematic view of a throttle operation link mechanism provided in the tractor.
[図 11]図 11は、図 10における XI-XI線断面図である。  FIG. 11 is a cross-sectional view taken along line XI-XI in FIG.
[図 12]図 12は、前記トラクタにおけるフロントユニットの後方斜視図である。  FIG. 12 is a rear perspective view of the front unit in the tractor.
[図 13]図 13は、図 3における ΧΠΙ-ΧΠΙ線に沿った断面図である。  FIG. 13 is a cross-sectional view taken along the line ΧΠΙ-ΧΠΙ in FIG.
[図 14]図 14は、前記エンジンユニット及び伝動ユニットを連結させてなるアッセンブリ の左斜視図であり、前記操作リンク構造を明示する為に一部の部材を削除した状態 を示している。  [FIG. 14] FIG. 14 is a left perspective view of the assembly in which the engine unit and the transmission unit are connected, and shows a state in which some members are deleted to clearly show the operation link structure.
[図 15]図 15は、前記エンジンユニット及び前記伝動ユニットを連結させてなるアツセ ンプリの右斜視図であり、前記操作リンク構造を明示する為に一部の部材を削除した 状態を示している。  FIG. 15 is a right perspective view of an assembly formed by connecting the engine unit and the transmission unit, and shows a state in which some members are deleted to clearly show the operation link structure. .
[図 16]図 16は、前記操作リンク構造の正面図である。  FIG. 16 is a front view of the operation link structure.
圆 17]図 17は、前記操作リンク構造の斜視図である。 圆 17] FIG. 17 is a perspective view of the operation link structure.
圆 18]図 18は、前記操作リンク構造における第 1リンク側第 1操作軸近傍の斜視図で ある。 18] FIG. 18 is a perspective view in the vicinity of the first link side first operation shaft in the operation link structure.
[図 19]図 19は、前記エンジンユニット及び前記伝動ユニットを連結させてなるアツセ ンプリの左側面図である。  FIG. 19 is a left side view of an assembly made by connecting the engine unit and the transmission unit.
[図 20]図 20は、前記操作リンク構造における第 2リンク側支持部材近傍の斜視図で ある。  FIG. 20 is a perspective view of the vicinity of a second link side support member in the operation link structure.
[図 21]図 21は、前記操作リンク構造における連結機構の断面図であり、前記第 2リン ク側操作軸の軸線に沿った断面を示して 、る。  FIG. 21 is a cross-sectional view of the coupling mechanism in the operation link structure, showing a cross section along the axis of the second link side operation shaft.
[図 22]図 22は、前記エンジンユニット及び前記伝動ユニットを分離させた状態の左側 面図である。  FIG. 22 is a left side view of the engine unit and the transmission unit separated from each other.
符号の説明 Explanation of symbols
1 卜ラクタ  1 卜
U1 伝動ユニット（第 1ユニット） エンジンユニット（第 2ユニット） U1 transmission unit (first unit) Engine unit (second unit)
エンジン  Engine
ダッシュボードスティ  Dashboard stay
ステアリング部  Steering part
ステアリングコラム  Steering column
ステアリングシャフト  Steering shaft
ステアリングホイ一ノレ  Steering wheel
ダッシュボード部  Dashboard part
ダッシュボード本体  Dashboard body
操作レバー部  Operation lever
前後進切替操作部材 (前後進切替レバー） 操作ペダル部  Forward / backward switching operation member (forward / backward switching lever) Operation pedal
クラッチぺダノレ Clutch Pedanore
L 左側ブレーキぺダノレL Left brake pedal
R 右側ブレーキぺダノレ R Right brake pedal
燃料タンク部  Fuel tank
燃料タンク  Fuel tank
前後進切替機構  Forward / reverse switching mechanism
操作アーム (前後進切替機構の切替操作部） 変速機構  Operating arm (switching operation part of forward / reverse switching mechanism)
伝動ハウジング  Transmission housing
操作リンク構造  Operation link structure
第 1操作リンク機構  First operation link mechanism
第 1リンク側第 1操作軸  First link side first operation axis
第 1リンク側第 1支持部材  First support member on the first link side
本体部  Body part
軸受部  Bearing part
ピン 541 凹状部材 pin 541 Concave member
542 支持板  542 Support plate
543 スリット  543 slit
545 凸状部材  545 Convex member
550 第 2操作リンク機構  550 Second operation link mechanism
551 第 2リンク側操作軸  551 Second link side operation axis
560 第 2リンク側支持部材  560 Second link side support member
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0018] 以下、本発明に係る操作リンク構造の好ましい実施の形態について、添付図面を 参照しつつ説明する。  Hereinafter, a preferred embodiment of an operation link structure according to the present invention will be described with reference to the accompanying drawings.
図 1及び図 2は、それぞれ、本実施の形態に係る操作リンク構造が適用されたトラク タ 1の左側面図及び右側面図である。  FIGS. 1 and 2 are a left side view and a right side view of the tractor 1 to which the operation link structure according to the present embodiment is applied, respectively.
[0019] 前記トラクタ 1は、駆動源 10からの動力を伝動部 20を介して出力部 30へ伝達する ように構成されている。 The tractor 1 is configured to transmit power from the drive source 10 to the output unit 30 via the transmission unit 20.
本実施の形態においては、前記トラクタ 1は、前記出力部 30として駆動車軸 31及 び PTO軸（図示せず）を有して!/ヽる。  In the present embodiment, the tractor 1 has a drive axle 31 and a PTO shaft (not shown) as the output unit 30!
従って、前記伝動部 20は、前記駆動源 10からの動力を駆動車軸 31へ伝達すると 共に、前記 PTO軸へも伝達するように構成されている。  Therefore, the transmission unit 20 is configured to transmit the power from the drive source 10 to the drive axle 31 and also to the PTO shaft.
[0020] 図 3に、前記伝動部 20の縦断側面図を示す。 FIG. 3 shows a vertical side view of the transmission unit 20.
詳しくは、図 3に示すように、前記伝動部 20は、前記駆動源 10からの動力を前記駆 動車軸 31へ伝達する走行系伝動機構 210と、前記駆動源 10からの動力を前記 PT O軸へ伝達する PTO系伝動機構 280と、前記走行系伝動機構 210及び前記 PTO 系伝動機構 280を収容する伝動ハウジング 290とを備えている。  Specifically, as shown in FIG. 3, the transmission unit 20 includes a traveling system transmission mechanism 210 that transmits power from the drive source 10 to the drive axle 31, and power from the drive source 10 to the PTO. A PTO transmission mechanism 280 that transmits to the shaft, and a transmission housing 290 that houses the traveling transmission mechanism 210 and the PTO transmission mechanism 280 are provided.
[0021] なお、本実施の形態においては、前記伝動部 20は、さらに、前記走行系伝動機構 210及び前記 PTO系伝動機構 280の伝動方向上流側に、クラッチ機構 200を備え ている。 In the present embodiment, the transmission unit 20 further includes a clutch mechanism 200 on the upstream side of the traveling transmission mechanism 210 and the PTO transmission mechanism 280 in the transmission direction.
前記クラッチ機構 200は、前記駆動源 10に作動連結されたクラッチ体 201と、前記 クラッチ体 201の出力側に作動連結された原動軸 202とを備えている。 前記クラッチ体 201は、前記駆動源 10にフライホイール 15を介して作動連結され ており、運転席近傍に備えられた下記クラッチペダル 155の操作に応じて、前記駆動 源 10から前記原動軸 202への動力伝達を係合又は遮断させ得るように構成されて いる。 The clutch mechanism 200 includes a clutch body 201 operatively connected to the drive source 10 and a driving shaft 202 operatively connected to the output side of the clutch body 201. The clutch body 201 is operatively connected to the drive source 10 via a flywheel 15. The clutch source 201 is moved from the drive source 10 to the driving shaft 202 in response to an operation of the clutch pedal 155 provided near the driver's seat. It is configured to be able to engage or shut off the power transmission.
[0022] 前記走行系伝動機構 210及び前記 PTO系伝動機構 280は、図 3に示すように、前 記原動軸 202に対して並列的に接続されている。  The traveling transmission mechanism 210 and the PTO transmission mechanism 280 are connected in parallel to the driving shaft 202 as shown in FIG.
詳しくは、前記走行系伝動機構 210は、前記原動軸 202に作動連結された前後進 切替機構 220と、前記前後進切替機構 220に作動連結された主変速機構 240と、前 記主変速機構 240からの回転動力を左右一対の主駆動車軸へ差動的に伝達する ディファレンシャル機構（図示せず）とを備えて!/、る。  Specifically, the traveling transmission mechanism 210 includes a forward / reverse switching mechanism 220 operatively connected to the driving shaft 202, a main transmission mechanism 240 operatively connected to the forward / reverse switching mechanism 220, and the main transmission mechanism 240. And a differential mechanism (not shown) that differentially transmits the rotational power from the left and right main drive axles.
なお、仕様に応じて、前記主変速機構及び前記ディファレンシャルギヤ機構の間に 、副変速機構を備え得る。  An auxiliary transmission mechanism may be provided between the main transmission mechanism and the differential gear mechanism according to specifications.
[0023] 前記前後進切替機構 220は、前記原動軸 202に作動連結された駆動軸 221と、前 記駆動軸 221に略平行に配設された従動軸 222と、前記駆動軸 221及び前記従動 軸 222に支持された正転用ギヤ列 223Fと、前記駆動軸 221及び前記従動軸 222に 支持された逆転用ギヤ列 223Rと、外部操作に基づき、前記正転用ギヤ列 223Fを 介して前記従動軸 222を正回転させる正転位置又は前記逆転用ギヤ列 223Rを介し て前記従動軸 222を逆回転させる逆転位置をとり得るように構成された前後進切替 シフター 224とを備えて!/、る。 The forward / reverse switching mechanism 220 includes a drive shaft 221 operatively connected to the drive shaft 202, a driven shaft 222 disposed substantially parallel to the drive shaft 221, the drive shaft 221 and the driven shaft. A forward gear train 223F supported by the shaft 222, a reverse gear train 223R supported by the drive shaft 221 and the driven shaft 222, and the driven shaft via the forward gear train 223F based on an external operation. A forward / reverse switching shifter 224 configured to be able to take a forward rotation position for rotating 222 forward or a reverse rotation position for reversely rotating the driven shaft 222 via the reverse gear train 223R.
前記前後進切替シフター 224は、前記正転位置及び前記逆転位置に加えて、前 記駆動軸 221から前記従動軸 222への動力伝達を遮断させる中立位置をとり得るよ うになつている。  The forward / reverse switching shifter 224 can take a neutral position in which power transmission from the drive shaft 221 to the driven shaft 222 is interrupted in addition to the forward rotation position and the reverse rotation position.
[0024] 前記前後進切替シフター 224は、後述する前後進切替操作機構 230及び前後進 切替操作リンク機構 500を介して、運転席近傍に備えられる人為操作可能な前後進 切替操作部材 131に作動連結されており、該前後進切替操作部材 131への人為操 作に応じて、前記シフター 224が前記正転位置，前記中立位置又は前記逆転位置 を選択的にとり得るようになって!/、る。  [0024] The forward / reverse switching shifter 224 is operatively connected to a manually operated forward / reverse switching operation member 131 provided near the driver's seat via a forward / reverse switching operation mechanism 230 and a forward / reverse switching operation link mechanism 500, which will be described later. The shifter 224 can selectively take the forward rotation position, the neutral position, or the reverse rotation position in accordance with the manual operation of the forward / reverse switching member 131.
[0025] 前記主変速機構 240は、前記従動軸 222の回転を多段変速して、後続する前記 ディファレンシャルギヤ機構へ伝達し得るように構成されて 、る。 [0025] The main transmission mechanism 240 shifts the rotation of the driven shaft 222 in multiple stages, and the subsequent transmission It is configured to be able to transmit to the differential gear mechanism.
具体的には、前記主変速装置 240は、図 3に示すように、主入力軸 241と、前記主 入力軸 241に略平行に配設された主出力軸 242と、前記主入力軸 241及び前記主 出力軸 242の間で多段変速を行うギヤ変速装置 250とを備えている。  Specifically, as shown in FIG. 3, the main transmission 240 includes a main input shaft 241, a main output shaft 242 disposed substantially parallel to the main input shaft 241, the main input shaft 241, And a gear transmission 250 that performs multi-stage shifting between the main output shafts 242.
[0026] 本実施の形態においては、前記主入力軸 241は、前記従動軸 222にギヤ列 245を 介して作動連結されている。  In the present embodiment, the main input shaft 241 is operatively connected to the driven shaft 222 via a gear train 245.
前記ギヤ変速装置 250は、前記主入力軸 241及び前記主出力軸 242に支持され た複数の主変速ギヤ列 251a〜251dと、前記主変速ギヤ列 251a〜251dの何れか 一のギヤ列を介して前記主出力軸 242を前記主入力軸 241に作動連結させる主変 速シフタ一 255a〜255cとを備えて!/、る。  The gear transmission 250 includes a plurality of main transmission gear trains 251a to 251d supported by the main input shaft 241 and the main output shaft 242 and one of the main transmission gear trains 251a to 251d. The main output shaft 242 is connected to the main input shaft 241 and main shift shifters 255a to 255c are provided.
[0027] なお、本実施の形態にお!、ては、前記ギヤ変速装置 250は、前記主変速ギヤ列 2 51a〜255eを介して前記主出力軸 242を変速回転させる変速段に加えて、前記主 出力軸 242を前記従動軸 222に直接的に連結させる変速段を有するようになつてい る。  [0027] In the present embodiment, the gear transmission 250 is added to a gear stage that rotates the main output shaft 242 through the main transmission gear trains 2 51a to 255e. A shift stage for directly connecting the main output shaft 242 to the driven shaft 222 is provided.
即ち、前記主出力軸 242は、前記従動軸 222と同軸上において軸線回り回転自在 とされている。  That is, the main output shaft 242 is rotatable about the axis on the same axis as the driven shaft 222.
そして、前記主変速シフター 255aは、対応する前記主変速ギヤ列 25 laを介して 前記主入力軸 241の回転を前記主出力軸 242に伝達する状態と、前記主出力軸 24 2を前記従動軸 222に直接連結させる状態とをとり得るように構成されて！、る。  The main transmission shifter 255a transmits the rotation of the main input shaft 241 to the main output shaft 242 via the corresponding main transmission gear train 25la, and transmits the main output shaft 242 to the driven shaft. It is configured so that it can be connected directly to 222! RU
なお、前記主変速シフター 255a〜255cは、主変速操作機構 260を介して、前記 運転席近傍に備えられた主変速レバー 265 (下記図 4参照）に作動連結されている。  The main transmission shifters 255a to 255c are operatively connected to a main transmission lever 265 (see FIG. 4 below) provided near the driver's seat via a main transmission operation mechanism 260.
[0028] 前記ディファレンシャル機構は、前記主出力軸 242からの回転動力を左右一対の 主駆動車軸 31に差動的に伝達し得るように構成されて ヽる。 [0028] The differential mechanism may be configured to differentially transmit the rotational power from the main output shaft 242 to the pair of left and right main drive axles 31.
なお、前記ディファレンシャルギヤ機構と前記一対の主駆動車軸 31との間には、左 右一対のブレーキ機構 (図示せず)が備えられる。  A pair of left and right brake mechanisms (not shown) are provided between the differential gear mechanism and the pair of main drive axles 31.
前記一対のブレーキ機構は、適宜のリンク機構を介して、前記運転席近傍に備えら れた左右一対の下記ブレーキペダル 158L, 158Rに作動連結されている。  The pair of brake mechanisms are operatively connected to a pair of left and right brake pedals 158L and 158R provided near the driver's seat via an appropriate link mechanism.
[0029] 仕様に応じて、前記走行系伝動機構 210には、さらに、副駆動車軸 (例えば、前車 軸 32 (図 1及び図 2参照)）へ向けて回転動力を出力する副駆動車軸用出力機構 (図 示せず)を備え得る。 [0029] Depending on the specifications, the traveling transmission mechanism 210 may further include a sub-drive axle (for example, a front axle). An auxiliary drive axle output mechanism (not shown) that outputs rotational power toward the shaft 32 (see FIGS. 1 and 2) may be provided.
前記副駆動車軸用出力機構は、副駆動車軸用出力軸と、外部操作に基づき、前 記主出力軸 242から前記副駆動車軸用出力軸への動力伝達を係合又は遮断させる クラッチとを備え得る。  The sub-drive axle output mechanism includes a sub-drive axle output shaft and a clutch that engages or interrupts power transmission from the main output shaft 242 to the sub-drive axle output shaft based on an external operation. obtain.
[0030] 前記 PTO系伝動機構 280は、前記原動軸 202に作動連結された PTO伝動軸 281 と、前記 PTO伝動軸 281及び前記 PTO軸の間に介挿された PTOクラッチ機構（図 示せず)及び PTO変速機構 (図示せず)とを備え得る。  [0030] The PTO transmission mechanism 280 includes a PTO transmission shaft 281 operatively connected to the driving shaft 202, and a PTO clutch mechanism (not shown) interposed between the PTO transmission shaft 281 and the PTO shaft. And a PTO transmission mechanism (not shown).
前記 PTOクラッチ機構は、外部操作に基づき、前記 PTO伝動軸 281から前記 PT O軸への動力伝達を選択的に係合又は遮断させ得るように構成されている。  The PTO clutch mechanism is configured to selectively engage or block power transmission from the PTO transmission shaft 281 to the PTO shaft based on an external operation.
前記 PTO変速機構は、外部操作に基づき、前記 PTO伝動軸 281から前記 PTO 軸へ伝達される回転動力を変速させ得るように構成されて 、る。  The PTO speed change mechanism is configured to change the rotational power transmitted from the PTO transmission shaft 281 to the PTO shaft based on an external operation.
[0031] 前記伝動ハウジング 290は、前記クラッチ機構 200,前記走行系伝動機構 210及 び前記 PTO系伝動機構 280を収容し得るように中空形状とされている。 [0031] The transmission housing 290 is hollow so as to accommodate the clutch mechanism 200, the traveling transmission mechanism 210, and the PTO transmission mechanism 280.
本実施の形態においては、前記伝動ハウジング 290は、前記フライホイール 15及 び前記クラッチ機構 200を収容するクラッチハウジング 291と、前記前後進切替機構 220及び前記主変速機構 240を収容する前部ハウジング 292と、前記ディファレンシ ャル機構を収容する後部ハウジング 294とを備えており、前記クラッチハウジング 291 ,前記前部ハウジング 292及び前記後部ハウジング 294は互いに直列連結されてい る。  In the present embodiment, the transmission housing 290 includes a clutch housing 291 that houses the flywheel 15 and the clutch mechanism 200, a front housing that houses the forward / reverse switching mechanism 220 and the main transmission mechanism 240. And a rear housing 294 that accommodates the differential mechanism, and the clutch housing 291, the front housing 292, and the rear housing 294 are connected in series with each other.
なお、前記副変速機構が備えられる場合には、前記伝動ハウジング 290には、前 記前部ハウジング 292及び前記後部ハウジング 294の間に中間ハウジング 293 (下 記図 4参照）が備えられる。  When the auxiliary transmission mechanism is provided, the transmission housing 290 includes an intermediate housing 293 (see FIG. 4 below) between the front housing 292 and the rear housing 294.
[0032] ここで、前記トラクタ 1の組立方法について説明する。 [0032] Here, a method of assembling the tractor 1 will be described.
図 4に、前記トラクタ 1の分解斜視図を示す。  FIG. 4 shows an exploded perspective view of the tractor 1.
図 4に示すように、前記トラクタ 1は、予めアッセンブリ化された複数のユニット Ul〜 U5を連結することで組み立てられるようになって 、る。  As shown in FIG. 4, the tractor 1 is assembled by connecting a plurality of previously assembled units Ul to U5.
[0033] 詳しくは、前記トラクタ 1は、前記駆動源 10として作用するエンジンを含むエンジン ユニット U2と、前記伝動部 20を構成する伝動ユニット Ulと、フロントアクスルケース 5 2L, 52Rを含むフロントユニット U3と、ステップ 'フェンダーユニット U4と、ボンネット ユニット U5とを備えて!/ヽる。 Specifically, the tractor 1 includes an engine that functions as the drive source 10. A unit U2, a transmission unit Ul constituting the transmission unit 20, a front unit U3 including front axle cases 52L and 52R, a step 'fender unit U4, and a bonnet unit U5!
[0034] 図 5及び図 6に、それぞれ、前記エンジンユニット U2を左後方力 視た斜視図及び 右後方から視た斜視図を示す。又、図 7に、前記エンジンユニット U2の拡大左斜視 図を示す。なお、図 5及び図 6においては、下記ダッシュボード部 120を取り外した状 態を示している。 5 and 6 show a perspective view of the engine unit U2 as viewed from the left rear and a perspective view as viewed from the right rear, respectively. FIG. 7 shows an enlarged left perspective view of the engine unit U2. 5 and 6 show a state in which the following dashboard 120 is removed.
図 1,図 2及び図 5〜図 7に示すように、前記エンジンユニット U2は、前記エンジン 1 0と、ステアリング部 110と、ダッシュボード部 120と、操作レバー部 130と、操作ぺダ ル部 150と、ボンネット支持部 170と、燃料タンク部 180とを含んでいる。  As shown in FIGS. 1, 2, and 5 to 7, the engine unit U2 includes the engine 10, a steering unit 110, a dashboard unit 120, an operation lever unit 130, and an operation pedal unit. 150, a bonnet support part 170, and a fuel tank part 180.
[0035] 詳しくは、前記エンジンユニット U2は、さらに、前記エンジン 10の後面に連結され たダッシュボードスティ 100を有しており、前記ステアリング部 110は前記ダッシュボ 一ドスティ 100を介して前記エンジン 10に支持されている。  Specifically, the engine unit U2 further includes a dashboard stay 100 connected to the rear surface of the engine 10, and the steering unit 110 is connected to the engine 10 via the dashboard door stay 100. It is supported.
[0036] 図 8に、前記ダッシュボードスティ 100近傍の拡大斜視図を示す。なお、図 8におい ては、前記ダッシュボード部 120を取り外した状態を示して 、る  FIG. 8 shows an enlarged perspective view of the vicinity of the dashboard stay 100. FIG. 8 shows a state in which the dashboard 120 is removed.
詳しくは、前記ダッシュボードスティ 100は、図 8に示すように、略垂直且つ車輛幅 方向に沿った状態で前記エンジンの後面に連結される取付板 101と、略垂直且つ車 輛前後方向に沿った状態で前記取付板 101から後方側へ延在された左右一対の支 持板 102a, 102bとを有して!/ヽる。  Specifically, as shown in FIG. 8, the dashboard stay 100 is provided with a mounting plate 101 connected to the rear surface of the engine in a substantially vertical direction along the vehicle width direction, and a substantially vertical direction along the vehicle front-rear direction. In this state, it has a pair of left and right support plates 102a, 102b extending from the mounting plate 101 to the rear side.
なお、本実施の形態においては、前記取付板 101は前記エンジン 10より車輛幅方 向に幅広とされている。そして、前記取付板 101のうち前記エンジン 10より車輛幅方 向外方へ突出する部分の下端部は、前記エンジン 10の両側面にそれぞれ連結され た補強板 109によって支持されている。  In the present embodiment, the mounting plate 101 is wider than the engine 10 in the vehicle width direction. A lower end portion of a portion of the mounting plate 101 that protrudes outward in the vehicle width direction from the engine 10 is supported by reinforcing plates 109 respectively connected to both side surfaces of the engine 10.
[0037] 前記ステアリング部 110は、図 5〜図 8に示すように、前記一対の支持板 102a, 10 2bの後部寄りの間に連結されたバルブブロック 111と、略上下方向に延びるように下 端部が前記バルブブロック 111に連結された中空のステアリングコラム 112と、下端 部が前記バルブブロック 111に内装されたパワーステアリング用バルブ（図示せず） に作動連結された状態で前記ステアリングコラム 112に内挿されたステアリングシャフ ト 113と、前記ステアリングシャフト 113の上端部に相対回転不能に連結されたステア リングホイール 114とを有して!/、る。 [0037] As shown in Figs. 5 to 8, the steering section 110 is connected to a valve block 111 connected between the rear portions of the pair of support plates 102a and 102b, and extends substantially vertically. A hollow steering column 112 having an end portion connected to the valve block 111 and a lower end portion operatively connected to a power steering valve (not shown) provided in the valve block 111 are connected to the steering column 112. Interpolated steering shaft And a steering wheel 114 connected to the upper end portion of the steering shaft 113 so as not to rotate relative to the steering shaft 113.
[0038] 前記ダッシュボード部 120は、図 7に示すように、前記ステアリングコラム 112を囲繞 するように、前記ダッシュボードスティ 100に支持されたダッシュボード本体 121と、前 記ダッシュボード本体 121に装着された計器パネル 122とを有して 、る。 As shown in FIG. 7, the dashboard portion 120 is attached to the dashboard body 121 supported by the dashboard stay 100 and the dashboard body 121 so as to surround the steering column 112. And an instrument panel 122.
[0039] 前記操作レバー部 130は、図 5〜図 8に示すように、レバーの形態をなす前記前後 進切替操作部材 131と、前記エンジン 10のガバナ 11を操作する為のスロットルレバ 一 141とを含んでいる。 As shown in FIGS. 5 to 8, the operation lever portion 130 includes the forward / reverse switching operation member 131 in the form of a lever, and a throttle lever 141 for operating the governor 11 of the engine 10. Is included.
前記前後進切替操作部材 131は、詳細は後述する前後進切替操作機構 230及び 本実施の形態に係る操作リンク構造 500を介して、前記前後進切替シフター 224〖こ 作動連結されている。  The forward / reverse switching operation member 131 is operatively connected to the forward / reverse switching shifter 224 through a forward / reverse switching operation mechanism 230, which will be described in detail later, and an operation link structure 500 according to the present embodiment.
[0040] 図 9に、前記トラクタ 1の運転席近傍の右側面図を示す。 FIG. 9 shows a right side view of the vicinity of the driver seat of the tractor 1.
前記スロットルレバー 141は、前記ダッシュボードスティ 100に間接的に支持されて いる。  The throttle lever 141 is indirectly supported by the dashboard stay 100.
詳しくは、図 6及び図 9に示すように、前記ダッシュボードスティ 100には、スロットル レバーステー 140が連結されて!、る。  In detail, as shown in FIGS. 6 and 9, a throttle lever stay 140 is connected to the dashboard stay 100 !.
前記スロットルレバーステー 140は、前端部が前記ダッシュボードスティ 100の前記 取付板 101に連結された側板 140aと、前記側板 140aの後端部力も車輛幅方向内 方へ延びて前記ダッシュボードスティ 100の前記右側の支持板 101bに連結された 後板 140bとを有する平面視略 L字状とされて ヽる。  The throttle lever stay 140 includes a side plate 140a having a front end connected to the mounting plate 101 of the dashboard stay 100, and a rear end force of the side plate 140a extending inward in the vehicle width direction. The rear plate 140b connected to the right support plate 101b has a substantially L shape in plan view.
[0041] 前記スロットルレバー 141は、図 6及び図 9に示すように、車輛幅方向に沿った基端 部 142と、前記基端部 142の車輛幅方向外端部から略上方へ延びる把持部 143と を有している。 [0041] As shown in Figs. 6 and 9, the throttle lever 141 includes a base end portion 142 along the vehicle width direction and a gripping portion extending substantially upward from the vehicle width direction outer end portion of the base end portion 142. And 143.
前記基端部 142は、車輛幅方向内端部が前記スロットルレバーステー 140の前記 側板 140bに軸線回り回転自在に支持され、且つ、車輛幅方向外端部が前記ダッシ ュボード本体 121の下方にお 、て該ダッシュボード本体 121よりも車輛幅方向外方 に位置されている。  The base end 142 is supported at its inner end in the vehicle width direction by the side plate 140b of the throttle lever stay 140 so as to be rotatable about its axis, and at the outer end in the vehicle width direction below the dashboard board 121. The dashboard body 121 is positioned outside the dashboard body 121 in the vehicle width direction.
前記把持部 143は、前記ダッシュボード本体 121よりも車輛幅方向外方において、 上端部が前記ステアリングホイール 114の近傍まで延びて 、る。 The grip portion 143 is more outward in the vehicle width direction than the dashboard body 121, The upper end extends to the vicinity of the steering wheel 114.
斯カるスロットルレバー 141は、図 6及び図 9に示すように、スロットル操作リンク機構 300を介して、前記ガバナ 11に作動連結されて!ヽる。  The throttle lever 141 is operatively connected to the governor 11 via the throttle operation link mechanism 300 as shown in FIGS.
[0042] 本実施の形態においては、前記ガバナ 11は、前記スロットルレバー 141に加えて、 スロットルペダル 330によっても操作され得るように構成されている。  In the present embodiment, the governor 11 is configured to be operated by a throttle pedal 330 in addition to the throttle lever 141.
図 10に、前記スロットル操作リンク機構 300の模式図を示す。  FIG. 10 shows a schematic diagram of the throttle operation link mechanism 300.
又、図 11に、図 10における XI-XI線断面図を示す。  FIG. 11 is a sectional view taken along line XI-XI in FIG.
[0043] 図 9〜図 11に示すように、前記スロットル操作リンク機構 300は、前記スロットルレバ 一 141の基端部 142に相対回転不能に設けられたレバー側操作部材 301と、前記 スロットルレバー 141の前記基端部 142に対して軸線回り回転自在とされた作動部 材 305と、前記作動部材 305及び前記ガバナ 11の間を作動連結するガバナ側リンク 部材 310と、前記作動部材 305及び前記スロットルペダル 330の間を作動連結する ペダル側リンク部材 315とを備えて 、る。  As shown in FIGS. 9 to 11, the throttle operation link mechanism 300 includes a lever-side operation member 301 provided at the base end 142 of the throttle lever 141 so as not to rotate relative to the throttle lever 141, and the throttle lever 141. An actuating member 305 that is rotatable about an axis with respect to the base end 142, a governor side link member 310 that actuates and connects the actuating member 305 and the governor 11, and the actuating member 305 and the throttle. A pedal-side link member 315 for operatively connecting the pedals 330 to each other.
[0044] 前記レバー側操作部材 301は、前記スロットルレバーステー 140の前記側板 140a より車輛幅方向外方において前記スロットルレバー 141の基端部 142に相対回転不 能とされた本体部 302と、前記本体部 302の周縁から前記側板 140aを超えて車輛 幅方向内方へ延びる作動片 303とを有して 、る。  [0044] The lever side operation member 301 includes a main body portion 302 that is relatively non-rotatable with a base end portion 142 of the throttle lever 141 outward from the side plate 140a of the throttle lever stay 140 in the vehicle width direction, And an operating piece 303 that extends inwardly in the vehicle width direction from the peripheral edge of the main body 302 beyond the side plate 140a.
前記作動片 303は、前記側板 140aより車輛幅方向内方側に配置された前記作動 部材 305の一側面（図示の形態のおいては前端面）に係合されている。  The operating piece 303 is engaged with one side surface (a front end surface in the illustrated embodiment) of the operating member 305 disposed on the inner side in the vehicle width direction from the side plate 140a.
[0045] 前記スロットルペダル 330は、図 10に良く示されるように、車輛幅方向に沿った軸 線回り回転自在に支持された基端部 331と、前記基端部 331から前記ステップ ·フエ ンダーユニット U4におけるステップ部 41の上方へ延在されたロッド部 332と、前記口 ッド部 332の先端部に設けられたペダル部 333と、前記基端部に相対回転不能とさ されたペダル側アーム部 334と、前記基端部 331を軸線回り一方側へ付勢する戻し ばね 335とを有している。  As shown in FIG. 10, the throttle pedal 330 includes a base end portion 331 that is supported so as to be rotatable about an axis along the vehicle width direction, and the step fader from the base end portion 331. The rod part 332 extending above the step part 41 in the unit U4, the pedal part 333 provided at the distal end part of the mouth part 332, and the pedal side which is relatively non-rotatable at the base end part An arm portion 334 and a return spring 335 for urging the base end portion 331 toward one side around the axis are provided.
本実施の形態においては、前記戻しばね 335は、前記ステップ部 41の下方におい て、一端部が固定され且つ他端部が前記ペダル側アーム部 334に連結されている。  In the present embodiment, the return spring 335 has one end fixed and the other end connected to the pedal-side arm 334 below the step portion 41.
[0046] 前記ペダル側リンク部材 315は、前記作動部材 305及び前記ペダル側アーム部 3 34の間に延びるペダル側ロッドとを有して 、る。 The pedal side link member 315 includes the operating member 305 and the pedal side arm portion 3. 34 and a pedal side rod extending between the two.
前記ガバナ側リンク部材 310は、前記作動部材 305及び前記ガバナ 11の間に延 びるガバナ側ロッドを有して 、る。  The governor side link member 310 includes a governor side rod extending between the actuating member 305 and the governor 11.
[0047] さらに、前記スロットル操作リンク機構 300は、図 11に示すように、前記スロットルレ バーステー 140の前記側板 140aと前記レバー側操作部材 301との間に、摩擦部材 320を備えている。 Further, as shown in FIG. 11, the throttle operation link mechanism 300 includes a friction member 320 between the side plate 140a of the throttle lever stay 140 and the lever side operation member 301.
前記摩擦部材 320は、前記レバー側操作部材 302に対して、前記戻しばね 335の 付勢力に抗して前記スロットルレバー 141の位置を保持し得るような摺動抵抗を生じ させる。  The friction member 320 generates a sliding resistance against the lever side operation member 302 so as to hold the position of the throttle lever 141 against the biasing force of the return spring 335.
[0048] 斯カる構成の前記スロットル操作リンク機構 300は、以下のように作動する。  [0048] The throttle operation link mechanism 300 having such a configuration operates as follows.
図 10に示すように、前記スロットルペダル 330を前記戻しばね 335の付勢力に抗し て初期位置 (例えば、低出力位置 L)力も操作位置 (例えば、高出力位置 H)へ踏み 込み操作すると、前記作動部材 305が前記基端部 142の軸線 (以下、レバー回転中 心 Rという）回り第 1方向 R1へ揺動し、これにより、前記ガバナ側リンク部材 310を介し て前記ガバナ 11が初期位置 (低出力状態)力 操作位置 (高出力状態)へ移行する なお、前記レバー側操作部材 301の前記作動片 303は、前記レバー回転中心 Rを 基準にして、前記作動部材 305の第 2方向側に位置している。  As shown in FIG. 10, when the throttle pedal 330 is operated to depress the initial position (e.g., low output position L) to the operating position (e.g., high output position H) against the biasing force of the return spring 335, The actuating member 305 swings in the first direction R1 around the axis of the base end 142 (hereinafter referred to as lever rotation center R), whereby the governor 11 is moved to the initial position via the governor side link member 310. (Low output state) Force Move to the operation position (High output state) The operating piece 303 of the lever side operating member 301 is on the second direction side of the operating member 305 with respect to the lever rotation center R. Is located.
従って、前記スロットルペダル 330を踏み込み操作する際には、前記スロットルレバ 一 141は初期位置 (低出力位置 L)〖こ位置したままである。  Therefore, when the throttle pedal 330 is depressed, the throttle lever 141 remains in the initial position (low output position L).
[0049] 前記スロットルペダル 330への踏み込み操作を解除すると、前記戻しばね 335によ つて前記スロットルペダル 330は操作位置力 初期位置へ戻され、前記作動部材 30 5は前記レバー回転中心 R回り第 2方向 R2へ揺動し、これにより、前記ガバナ側リン ク部材 310を介して前記ガバナが初期位置へ戻る。 [0049] When the operation of depressing the throttle pedal 330 is released, the throttle spring 330 is returned to the initial position of the operation position force by the return spring 335, and the actuating member 305 is rotated around the lever rotation center R in the second position. The governor swings in the direction R2, and thereby the governor returns to the initial position via the governor side link member 310.
なお、前記作動片 303は、前記スロットルレバーステー 140における前記側板 140 aに形成された切り欠き内に位置しており、該切り欠きによって前記作動片 303の揺 動範囲が画されている。従って、前記戻しばね 335による付勢力によってレバー回転 中心 R回り第 2方向 R2へ揺動する前記作動部材 305は、前記作動片 303に当接す ることでレバー回転中心 R回り第 2方向 R2への移動が停止される。 The operating piece 303 is located in a notch formed in the side plate 140a of the throttle lever stay 140, and the operating range of the operating piece 303 is defined by the notch. Therefore, the operating member 305 that swings around the lever rotation center R in the second direction R2 by the biasing force of the return spring 335 contacts the operating piece 303. This stops the movement in the second direction R2 around the lever rotation center R.
[0050] これに対し、前記スロットルレバー 141を初期位置力も操作位置へ揺動操作すると 、前記作動片 303によって前記作動部材 305がレバー回転中心 R回り第 1方向 R1 へ揺動し、これにより、前記ガバナ 11が初期位置から操作位置へ移行する。 [0050] On the other hand, when the throttle lever 141 is swung to the operating position, the operating member 305 is swung in the first direction R1 around the lever rotation center R by the operating piece 303. The governor 11 moves from the initial position to the operation position.
この際、前記スロットルペダル 330は、前記戻しばね 335の付勢力に抗して、前記 ペダル側リンク部材 315を介して初期位置力も操作位置へ移行している。従って、前 記スロットルレバー 141は、前記戻しばね 335によって初期位置へ戻されようとするが 、前述の通り、前記スロットルレバーステー 140の前記側板 140aと前記レバー側操 作部材 301との間には前記摩擦部材 320が備えられている。  At this time, in the throttle pedal 330, the initial position force is also shifted to the operation position via the pedal side link member 315 against the urging force of the return spring 335. Accordingly, the throttle lever 141 tends to be returned to the initial position by the return spring 335. As described above, the throttle lever 141 is not provided between the side plate 140a of the throttle lever stay 140 and the lever side operation member 301. The friction member 320 is provided.
従って、前記スロットルレバー 141は、前記摩擦部材 320によって操作位置に保持 される。  Accordingly, the throttle lever 141 is held in the operating position by the friction member 320.
[0051] 斯カるスロットル操作機構 300によれば、以下の効果を奏する。  [0051] According to such a throttle operation mechanism 300, the following effects are obtained.
即ち、前記ガバナ 11を一時的に操作位置 (例えば、エンジン 10の高出力状態）に 位置させたい場合には、前記スロットルペダル 330を踏み込み操作することにより、 該スロットルペダル 330の踏み込み操作時のみ前記ガバナ 11を操作位置に位置さ せることができる。  That is, when it is desired to temporarily position the governor 11 at the operation position (for example, the high output state of the engine 10), the throttle pedal 330 is depressed to operate only when the throttle pedal 330 is depressed. The governor 11 can be placed in the operating position.
これに対し、前記ガバナ 11を継続的に操作位置に位置させたい場合には、前記ス ロットルレバー 141を前記摩擦部材 320の摺動抵抗及び前記戻しばね 335の付勢 力に杭して初期位置力 操作位置へ移行させることにより、該スロットルレバー 141へ の操作力解除後も前記ガバナ 11を操作位置に保持することができる。  On the other hand, when the governor 11 is to be continuously positioned at the operating position, the throttle lever 141 is piled on the sliding resistance of the friction member 320 and the biasing force of the return spring 335 to set the initial position. By moving to the force operation position, the governor 11 can be held at the operation position even after the operation force to the throttle lever 141 is released.
[0052] 前記操作ペダル部 150は、図 5,図 6及び図 8に示すように、前記ダッシュボードス ティ 100に支持された中空支持部材 151と、両端部が外方へ延在された状態で前記 中空支持部材 151に内挿されたペダル軸 152と、前記ペダル軸 152の一端側延在 部（図示の形態にぉ 、ては左端部）に相対回転自在に外挿されたクラッチボス 153と 、前記クラッチボス 153に支持されたクラッチアーム 154と、前記クラッチアーム 154 の自由端部に設けられたクラッチペダル 155と、前記ペダル軸 152の他端側延在部 (図示の形態においては右端部）に相対回転不能に外挿された左側ブレーキボス 15 6Lと、前記左側ブレーキボス 156Lよりも他端側において前記ペダル軸 152に相対 回転自在に外挿された右側ブレーキボス 156Rと、前記左側ブレーキボス 156Lに支 持された左側ブレーキアーム 157Lと、前記左側ブレーキアーム 157Lの自由端部に 設けられた左側ブレーキペダル 158Lと、前記右側ブレーキボス 156Rに支持された 右側ブレーキアーム 157Rと、前記右側ブレーキアーム 157Rの自由端部に設けられ た右側ブレーキペダル 158Rとを備えて!/、る。 [0052] As shown in Figs. 5, 6 and 8, the operation pedal portion 150 includes a hollow support member 151 supported by the dashboard tee 100 and a state in which both end portions extend outward. The pedal shaft 152 inserted in the hollow support member 151, and a clutch boss 153 externally inserted in a relatively rotatable manner at one end side extension portion (the left end portion in the illustrated embodiment) of the pedal shaft 152. A clutch arm 154 supported by the clutch boss 153, a clutch pedal 155 provided at a free end of the clutch arm 154, and an extension portion on the other end side of the pedal shaft 152 (the right end in the illustrated form) Left brake boss 15 6L extrapolated to be non-rotatable relative to the pedal shaft 152 on the other end side of the left brake boss 156L. A right brake boss 156R which is rotatably inserted, a left brake arm 157L supported by the left brake boss 156L, a left brake pedal 158L provided at a free end of the left brake arm 157L, and the right A right brake arm 157R supported by the brake boss 156R, and a right brake pedal 158R provided at the free end of the right brake arm 157R.
[0053] 前記クラッチボス 153は、クラッチリンク機構（図示せず)を介して前記クラッチ機構 2 00に作動連結されている。 [0053] The clutch boss 153 is operatively connected to the clutch mechanism 200 via a clutch link mechanism (not shown).
前記ペダル軸 152の一端側延在部のうち前記クラッチボス 153より車輛幅方向外 方に位置する部分は、左ブレーキリンク機構（図示せず)を介して前記左ブレーキ機 構に作動連結されている。  A portion of the extended portion on one end side of the pedal shaft 152 that is located outwardly in the vehicle width direction from the clutch boss 153 is operatively connected to the left brake mechanism via a left brake link mechanism (not shown). Yes.
前記右側ブレーキボス 157Rは、右側ブレーキリンク機構（図示せず)を介して前記 右側ブレーキ機構に作動連結されて 、る。  The right brake boss 157R is operatively connected to the right brake mechanism via a right brake link mechanism (not shown).
[0054] 前記ボンネット支持部 170は、図 5,図 6及び図 8に示すように、前記エンジン 10の 上方に設けられたボンネット支持部材 171を有している。 The bonnet support 170 has a bonnet support member 171 provided above the engine 10 as shown in FIGS.
前記ボンネット支持部材 171は、略上下方向に延びる左右一対の縦部材 172と、 前記一対の縦部材 172の上端部間を連結する横部材 173とを有する背面視門形形 状とされている。  The bonnet support member 171 has a rear portal shape having a pair of left and right vertical members 172 extending substantially in the vertical direction and a horizontal member 173 connecting between the upper ends of the pair of vertical members 172.
[0055] 前記燃料タンク部 180は、図 5,図 6及び図 8に示すように、前記エンジン 10の上方 に設けられた燃料タンク枠体 181と、前記燃料タンク枠体 181に支持される燃料タン ク 182とを有して!/ヽる。  As shown in FIGS. 5, 6 and 8, the fuel tank section 180 includes a fuel tank frame 181 provided above the engine 10, and a fuel supported by the fuel tank frame 181. With tank 182!
前記燃料タンク枠体 181は、前記左右一対の縦部材 172の間において車輛前後 方向に延びており、前記燃料タンク 182は前記ボンネット支持部材 171に内挿された 状態で前記燃料タンク枠体 181に支持されて 、る。  The fuel tank frame 181 extends in the vehicle front-rear direction between the pair of left and right vertical members 172, and the fuel tank 182 is inserted into the bonnet support member 171 in the fuel tank frame 181. It is supported.
なお、図 7及び図 9等に示すように、前記燃料タンク 182のキャップ 183は、前記ダ ッシュボード本体 121に設けられた開口を介して外部からアクセス可能とされている。  7 and 9 and the like, the cap 183 of the fuel tank 182 can be accessed from the outside through an opening provided in the dashboard main body 121.
[0056] 図 12に、前記フロントユニット U3の後方斜視図を示す。 FIG. 12 shows a rear perspective view of the front unit U3.
前記フロントユニット U3は、図 4に示すように、左右一対の連結板 5を介して前記ェ ンジンユニット U2に着脱可能に連結されている。 [0057] 具体的には、前記フロントユニット U2は、図 4及び図 12に示すように、铸造形成さ れたフロント本体 50と、前記フロント本体 50に連結されたフロントケース 51と、前記フ ロントケース 51の左右側面にそれぞれ連結された左右フロントアクスルケース 52L, 52Rと、前記フロント本体 50の前端部に設けられたフロントウェイト取付部 53に着脱 可能に装着されるフロントウェイト（図示せず)と、前記フロント本体 50に支持されたバ ッテリー 54と、前記フロント本体 50に設けられた枠体 55を介して支持されたラジェタ 一（図示せず）とを備えて 、る。 As shown in FIG. 4, the front unit U3 is detachably connected to the engine unit U2 via a pair of left and right connecting plates 5. Specifically, as shown in FIG. 4 and FIG. 12, the front unit U2 includes a front body 50 that is forged, a front case 51 that is connected to the front body 50, and the front case. Left and right front axle cases 52L, 52R respectively connected to the left and right side surfaces of 51, and a front weight (not shown) removably attached to a front weight mounting portion 53 provided at the front end of the front body 50, A battery 54 supported by the front body 50 and a radiator (not shown) supported by a frame 55 provided on the front body 50 are provided.
[0058] 前記ステップ ·フェンダーユニット U4は、図 4に示すように、左右一対のステップ 'フ エンダー 40を有して!/、る。  [0058] As shown in FIG. 4, the step fender unit U4 has a pair of left and right step 'fenders 40! /.
前記ステップ 'フェンダー 40は、ステップ部 41及びフェンダー部 42を一体的に備え ている。  The step fender 40 is integrally provided with a step part 41 and a fender part 42.
[0059] 前記ボンネットユニット U5は、図 4に示すように、前記ボンネット支持部材 171に着 脱自在に連結されるボンネットフード 60を有して!/、る。  [0059] As shown in FIG. 4, the bonnet unit U5 has a hood 60 that is detachably connected to the bonnet support member 171.
前記ボンネットフード 60は、前記エンジン 10,前記燃料タンク 182及び前記フロント ユニット U3の上方を覆う収容位置と、これらを開放する開放位置とをとり得るように、 前記ボンネット支持部材 171に揺動可能に連結されて 、る。  The bonnet hood 60 is swingable to the bonnet support member 171 so as to be able to take a housing position covering the engine 10, the fuel tank 182 and the front unit U3 and an open position for opening them. It is connected.
[0060] 次に、前記前後進切替操作機構 230について説明する。 Next, the forward / reverse switching operation mechanism 230 will be described.
図 13に、図 3における ΧΠΙ-ΧΠΙ線に沿った前記伝動ユニット U1の縦断正面図を示 す。  FIG. 13 is a longitudinal front view of the transmission unit U1 taken along line ΧΠΙ-ΧΠΙ in FIG.
[0061] 図 13に示すように、前記前後進切替操作機構 230は、前記駆動軸 221及び前記 従動軸 222と略平行な状態で前記伝動ハウジング 290内に配設されたフォーク軸 23 1と、基端部が前記フォーク軸 231に軸線方向摺動可能に支持され且つ先端部が前 記前後進切替シフター 224に係合されたフォーク 232と、一端部が前記伝動ハウジ ング 290の外方に位置した状態で前記フォーク軸 231に対して略直交する方向に沿 つて前記伝動ハウジング 290に軸線回り回転自在に支持された操作軸 233と、前記 操作軸 233及び前記フォーク 232の基端部を連結する作動アーム 234と、前記操作 軸 233の外方延在部に相対回転不能に支持された操作アーム 235とを備えている。  As shown in FIG. 13, the forward / reverse switching operation mechanism 230 includes a fork shaft 231 disposed in the transmission housing 290 in a state substantially parallel to the drive shaft 221 and the driven shaft 222, A fork 232 having a base end portion slidably supported by the fork shaft 231 in an axial direction and a tip end portion engaged with the forward / reverse switching shifter 224, and one end portion positioned outside the transmission housing 290 In this state, the operation shaft 233 supported by the transmission housing 290 so as to be rotatable about the axis along the direction substantially orthogonal to the fork shaft 231 is connected to the base end portions of the operation shaft 233 and the fork 232. An operating arm 234 and an operating arm 235 supported on the outwardly extending portion of the operating shaft 233 so as not to rotate relative to each other are provided.
[0062] 本実施の形態においては、前記操作アーム 235が、前記前後進切替機構 220の 作動状態を切り替える切替操作部として作用する。 In the present embodiment, the operation arm 235 includes the forward / reverse switching mechanism 220. Acts as a switching operation section for switching the operating state.
即ち、人為操作に基づき前記操作アーム 235が前記操作軸 233の軸線回りに揺動 操作されると、前記フォーク 232が前記フォーク軸 231に沿って摺動し、これにより、 前記前後進切替シフター 224が正転位置，中立位置又は逆転位置に位置する。  That is, when the operation arm 235 is swing-operated around the axis of the operation shaft 233 based on human operation, the fork 232 slides along the fork shaft 231, thereby the forward / reverse switching shifter 224. Is in the forward rotation position, neutral position or reverse rotation position.
[0063] なお、本実施の形態においては、図 13に示すように、前記伝動ハウジング 290を 構成する前記前部ハウジング 292は、右側面に開口が設けられた前部ハウジング本 体 292aと、前記開口を閉塞するように前記前部ハウジング本体 292aに着脱可能に 連結されるキャップ状のケース部材 292bとを有している。 In the present embodiment, as shown in FIG. 13, the front housing 292 constituting the transmission housing 290 includes a front housing body 292a having an opening on the right side, and the A cap-like case member 292b detachably coupled to the front housing body 292a so as to close the opening.
斯カる構成において、前記操作軸 233は、前記ケース部材 292bに軸線回り回転 自在に支持されている。  In such a configuration, the operation shaft 233 is supported by the case member 292b so as to be rotatable about its axis.
[0064] ここで、本実施の形態に係る操作リンク構造 500について説明する。 Here, operation link structure 500 according to the present embodiment will be described.
本実施の形態に係る操作リンク構造 500は、前記前後進切替機構 220の切替作動 部 235と人為操作可能な前記前後進切替操作部材 131とを作動連結するように構 成されている。  The operation link structure 500 according to the present embodiment is configured to operatively connect the switching operation portion 235 of the forward / reverse switching mechanism 220 and the forward / backward switching operation member 131 that can be manually operated.
[0065] 図 14及び図 15に、前記エンジンユニット U2及び前記伝動ユニット U1を連結させ てなるアッセンプリの左斜視図及び右斜視図を示す。なお、図 14及び図 15において は、前記操作リンク構造 500が明示されるように、一部の部材を削除している。  14 and 15 show a left perspective view and a right perspective view of an assembly in which the engine unit U2 and the transmission unit U1 are connected. In FIGS. 14 and 15, some members are deleted so that the operation link structure 500 is clearly shown.
又、図 16及び図 17に、それぞれ、前記操作リンク構造 500のみの正面図及び前方 斜視図を示す。  FIGS. 16 and 17 show a front view and a front perspective view of only the operation link structure 500, respectively.
[0066] 図 14〜図 17に示すように、前記操作リンク構造 500は、前記切替作動部 235に連 結された状態で前記伝動ユニット U1に支持された第 1操作リンク機構 510と、前記前 後進切替操作部材 131に連結された状態で前記エンジンユニット U2に支持された 第 2操作リンク機構 550とを備えている。  [0066] As shown in FIGS. 14 to 17, the operation link structure 500 includes a first operation link mechanism 510 supported by the transmission unit U1 in a state of being connected to the switching operation unit 235, and the front link And a second operation link mechanism 550 supported by the engine unit U2 in a state of being connected to the reverse switching operation member 131.
[0067] 前記第 1及び第 2操作リンク機構 510, 550は、それぞれ、対応する前記ユニット U 1, U2に支持された状態のままで、互いに対し連結 Z分離させ得るようになつている 斯カる操作リンク構造 500によれば、前記第 1操作リンク機構 510を前記伝動ュ- ット U1に取り付け且つ前記第 2操作リンク機構 550を前記エンジンユニット U2に取り 付けた状態で、前記伝動ユニット Ul及び前記エンジンユニット U2の連結作業又は 分離作業を行うことができる。 [0067] The first and second operation link mechanisms 510 and 550 can be connected to and separated from each other while being supported by the corresponding units U1 and U2, respectively. According to the operation link structure 500, the first operation link mechanism 510 is attached to the transmission gear U1, and the second operation link mechanism 550 is attached to the engine unit U2. In the attached state, the transmission unit Ul and the engine unit U2 can be connected or separated.
従って、前記トラクタ 1の組立作業及びメンテナンス作業の効率ィ匕を図ることができ る。  Therefore, the efficiency of assembly work and maintenance work of the tractor 1 can be improved.
[0068] 本実施の形態においては、前記第 1操作リンク機構 510は、図 16及び図 17に示す ように、軸線回り回転可能な状態で略上下方向に沿って配設される第 1リンク側第 1 操作軸 511を有しており、該第 1リンク側第 1操作軸 511が軸線回りに回転することに よって切替操作部として作用する前記操作アーム 235を介して前記操作軸 233が軸 線回りに回転するようになって!/、る。  In the present embodiment, as shown in FIGS. 16 and 17, the first operation link mechanism 510 is disposed on the first link side substantially along the vertical direction while being rotatable about the axis. The first operation shaft 511 is provided, and the first link side first operation shaft 511 rotates around the axis, whereby the operation shaft 233 is connected to the axis via the operation arm 235 acting as a switching operation unit. Rotating around! /
[0069] 詳しくは、前記第 1操作リンク機構 510は、前記第 1リンク側第 1操作軸 511と、前記 第 1リンク側第 1操作軸 511の軸線回りの回転に応じて自己の軸線方向に沿つて移 動するように該第 1リンク側第 1操作軸 511に作動連結された第 1リンク側第 1ロッド 5 13と、前記第 1リンク側第 1ロッド 513の移動に応じて自己の軸線回りに回転するよう に該第 1リンク側第 1ロッド 513に作動連結された第 1リンク側第 2操作軸 515と、前記 第 1リンク側第 2操作軸 515の軸線回りの回転に応じて自己の軸線に沿って移動する ように該第 1リンク側第 2操作軸 515に作動連結された第 1リンク側第 2ロッド 517とを 備えており、前記第 1リンク側第 2ロッド 517が前記操作アーム 235に作動連結されて いる。  [0069] Specifically, the first operation link mechanism 510 moves in the direction of its own axis according to the rotation of the first link side first operation shaft 511 and the first link side first operation shaft 511 around the axis. The first link side first rod 513 operatively connected to the first link side first operating shaft 511 to move along the first link side first rod 513 and its own axis line according to the movement of the first link side first rod 513 The first link side second operating shaft 515 operatively connected to the first link side first rod 513 so as to rotate about the first link side and the first link side second operating shaft 515 are self-responsive to rotation around the axis. The first link side second rod 517 is operatively connected to the first link side second operation shaft 515 so as to move along the axis of the first link side second rod 517. Operatively connected to arm 235.
[0070] 本実施の形態においては、前記第 1リンク側第 1操作軸 511の下端部に、第 1リンク 側第 1アーム 512が相対回転不能に設けられている。  In the present embodiment, the first link side first arm 512 is provided at the lower end portion of the first link side first operating shaft 511 so as not to be relatively rotatable.
前記第 1リンク側第 1ロッド 513は、一端部が前記第 1リンク側第 1アーム 512の自由 端部に作動連結され且つ他端部が前記第 1リンク側第 2操作軸 515の上端部に相対 回転不能に設けられた第 1リンク側第 2上方アーム 514に作動連結されている。 なお、前記第 1リンク側第 1操作軸 511は、図 14等に示すように、前記伝動ハウジン グ 290の車輛幅方向略中央の前記ステアリングコラム 112近傍において略上下方向 に沿って配置されている。一方、前記第 1リンク側第 2操作軸 515は、図 15等に示す ように、前記伝動ハウジング 290の右側方にぉ 、て略上下方向に沿って配置されて いる。 従って、前記第 1リンク側第 1ロッド 513は、前記第 1リンク側第 1及び第 2操作軸 51 1, 515を作動連結し得るように、車輛幅方向に沿って配置されている。 One end of the first link side first rod 513 is operatively connected to the free end of the first link side first arm 512 and the other end is connected to the upper end of the first link side second operating shaft 515. It is operatively connected to a first link side second upper arm 514 provided so as not to rotate relative to the first link side. The first link side first operating shaft 511 is disposed substantially vertically in the vicinity of the steering column 112 at the approximate center in the vehicle width direction of the transmission housing 290, as shown in FIG. . On the other hand, the first link side second operation shaft 515 is disposed substantially along the vertical direction on the right side of the transmission housing 290, as shown in FIG. Therefore, the first link side first rod 513 is arranged along the vehicle width direction so that the first link side first and second operation shafts 51 1 and 515 can be operatively connected.
[0071] 前記第 1リンク側第 2操作軸 515の下端部には、第 1リンク側第 2下方アーム 516が 相対回転不能に設けられて 、る。 [0071] A first link side second lower arm 516 is provided at the lower end portion of the first link side second operation shaft 515 so as not to be relatively rotatable.
そして、前記第 1リンク側第 2ロッド 517は、前記第 1リンク側第 2下方アーム 516の 自由端部と前記操作アーム 235の自由端部とを作動連結し得るように、車輛前後方 向に沿って延びている。  The first link side second rod 517 is arranged in the vehicle front-rear direction so that the free end portion of the first link side second lower arm 516 and the free end portion of the operation arm 235 can be operatively connected. Extending along.
[0072] 図 18に、前記第 1リンク側第 1操作軸 511近傍の斜視図を示す。 FIG. 18 is a perspective view of the vicinity of the first link side first operating shaft 511.
図 18に示すように、本実施の形態においては、前記第 1リンク側第 1操作軸 511は 、前記伝動ハウジング 290に設けられた第 1リンク側第 1支持部材 530によって軸線 回り回転自在に支持されて 、る。  As shown in FIG. 18, in the present embodiment, the first link side first operating shaft 511 is supported by a first link side first support member 530 provided in the transmission housing 290 so as to be rotatable about its axis. It has been.
詳しくは、前記第 1リンク側第 1支持部材 530は、前記伝動ハウジング 290の上面に 固着された底板及び該底板から上方へ延びる一対の側板を含む本体部 531と、前 記本体部 531の前方側に位置するように該本体部 531に支持された軸受部 535とを 有している。  Specifically, the first link side first support member 530 includes a main body portion 531 including a bottom plate fixed to the upper surface of the transmission housing 290 and a pair of side plates extending upward from the bottom plate, and a front portion of the main body portion 531. And a bearing portion 535 supported by the main body portion 531 so as to be positioned on the side.
そして、前記第 1リンク側第 1操作軸 511は、上端部及び下端部がそれぞれ外方へ 延在された状態で前記軸受部 535によって軸線回り回転自在に支持されている。  The first link side first operating shaft 511 is supported by the bearing portion 535 so as to be rotatable about the axis line with the upper end portion and the lower end portion extending outward.
[0073] 図 19に、前記エンジンユニット U2及び前記伝動ユニット U1を連結させてなるアツ センプリの左側面図を示す。 FIG. 19 shows a left side view of an assembly obtained by connecting the engine unit U2 and the transmission unit U1.
好ましくは、図 7及び図 19に示すように、前記本体部 531における前記一対の側板 を、それぞれ、前記ダッシュボードスティ 100における一対の側板 102a, 102bにボ ルト 'ナット等の締結部材 533を介して着脱可能に連結させることができる。  Preferably, as shown in FIGS. 7 and 19, the pair of side plates in the main body 531 are respectively connected to the pair of side plates 102a, 102b in the dashboard stay 100 via fastening members 533 such as bolts and nuts. And can be detachably connected.
斯カゝる構成を備えることにより、前記ダッシュボードスティ 100及び前記第 1リンク側 第 1支持部材 530の双方の安定ィ匕を図ることができる。  By providing such a configuration, both the dashboard stay 100 and the first link side first support member 530 can be stabilized.
[0074] 前記第 2操作リンク機構 550は、図 14〜図 19に示すように、前記前後進切替操作 部材 131への人為操作に応じて軸線回りに回転する第 2リンク側操作軸 551を有し ている。 As shown in FIGS. 14 to 19, the second operation link mechanism 550 has a second link side operation shaft 551 that rotates around the axis line in response to an artificial operation to the forward / reverse switching operation member 131. is doing.
前記第 2リンク側操作軸 551は、前記伝動ユニット U1及び前記エンジンユニット U2 を連結させた状態において、下端部が前記第 1リンク側第 1操作軸 511の上端部に 対して対向した状態で軸線回り相対回転不能に且つ着脱可能に連結されるように構 成されている。 The second link side operation shaft 551 includes the transmission unit U1 and the engine unit U2. Are connected to each other so that the lower end portion of the first link side first operating shaft 511 faces the upper end portion of the first link side first operation shaft 511 so that the lower end portion is relatively non-rotatable and detachable. .
即ち、前記第 2リンク側操作軸 551を前記第 1リンク側第 1操作軸 511に連結させた 状態においては、前記前後進切替操作部材 131への人為操作に応じて前記第 1リ ンク側第 1操作軸 511が軸線回りに回転し、これにより、切替作動部として作用する 前記操作アーム 235が前記操作軸 233回りに揺動するようになって 、る。  That is, in the state where the second link side operation shaft 551 is connected to the first link side first operation shaft 511, the first link side operation shaft 551 is operated in response to an artificial operation to the forward / reverse switching operation member 131. 1 The operation shaft 511 rotates around the axis, and the operation arm 235 acting as a switching operation portion swings around the operation shaft 233.
[0075] 詳しくは、前記第 2操作リンク機構 550は、前記第 2リンク側操作軸 551と、前記第 2 リンク側操作軸 551を軸線回り回転自在な状態で直接又は間接的に支持する第 2リ ンク側支持部材 560とを備えて 、る。 [0075] Specifically, the second operation link mechanism 550 supports the second link side operation shaft 551 and the second link side operation shaft 551 directly or indirectly in a state of being freely rotatable about an axis. A link-side support member 560.
図 20に、前記第 2リンク側支持部材 560近傍の斜視図を示す。  FIG. 20 is a perspective view of the vicinity of the second link side support member 560. FIG.
[0076] 図 20に示すように、本実施の形態においては、前記第 2リンク側支持部材 560は、 前記ステアリングコラム 112に固定された状態で、前記第 2リンク側操作軸 551を支 持するように構成されている。 As shown in FIG. 20, in the present embodiment, the second link side support member 560 supports the second link side operation shaft 551 while being fixed to the steering column 112. It is configured as follows.
具体的には、前記第 2リンク側支持部材 560は、前記ステアリングコラム 112に連結 されるベース部 561と、前記ベース部 561から側方へ延びる支持部 562とを有してい る。  Specifically, the second link side support member 560 includes a base portion 561 connected to the steering column 112, and a support portion 562 extending laterally from the base portion 561.
そして、前記第 2リンク側操作軸 551は、前記支持部材 562に設けられた軸受部材 565を介して軸線回り回転自在に支持されて 、る。  The second link side operation shaft 551 is supported so as to be rotatable about an axis via a bearing member 565 provided on the support member 562.
[0077] さらに、本実施の形態においては、前記第 2操作リンク機構 550は、前記前後進切 替操作部材 131への人為操作に応じて前記第 2リンク側操作軸 511を軸線回りに回 転させると共に、前記前後進切替操作部材 131を中立位置に係止させ得る連結機 構 600を有している。 Furthermore, in the present embodiment, the second operation link mechanism 550 rotates the second link side operation shaft 511 around the axis in response to an artificial operation to the forward / reverse switching operation member 131. And a connecting mechanism 600 capable of locking the forward / reverse switching operation member 131 in the neutral position.
[0078] 詳しくは、前記前後進切替操作部材 131は、前記第 2リンク側操作軸 551と同軸上 で対向配置される基準軸部 132と、前記基準軸部 132の上端から斜め上方へ延在さ れた操作軸部 133とを有している。  Specifically, the forward / reverse switching operation member 131 includes a reference shaft portion 132 that is coaxially opposed to the second link side operation shaft 551, and extends obliquely upward from the upper end of the reference shaft portion 132. The operation shaft portion 133 is provided.
前記操作軸部 133は、自由端部が前記ダッシュボード 120から外方へ延在されて いる（図 7等参照)。 即ち、使用者が前記操作軸部 133の自由端部を把持して操作することにより、前記 前後進切替操作部材 131は、前記基準軸部 132の軸線回りに回転するようになって いる。 The operation shaft portion 133 has a free end portion extending outward from the dashboard 120 (see FIG. 7 and the like). That is, when the user grasps and operates the free end portion of the operation shaft portion 133, the forward / reverse switching operation member 131 rotates around the axis of the reference shaft portion 132.
[0079] 前記連結機構 600は、前記前後進切替操作部材 131の前記基準軸部 132の軸線 回りの回転によって、前記第 2リンク側操作軸 551が軸線回りに回転するように、両者 を連結しており、さらに、前記連結機構 600は、前記前後進切替操作部材 131を中 立位置に保持するディテント作用を奏するように構成されて 、る。  [0079] The coupling mechanism 600 couples the forward / reverse switching operation member 131 so that the second link side operation shaft 551 rotates about the axis by rotation of the reference shaft portion 132 about the axis. Further, the connecting mechanism 600 is configured to exhibit a detent action for holding the forward / reverse switching operation member 131 in a neutral position.
[0080] 図 21に、前記第 2リンク側操作軸 551の軸線に沿った前記連結機構 600の縦断面 図を示す。  FIG. 21 is a longitudinal sectional view of the coupling mechanism 600 taken along the axis of the second link side operation shaft 551.
図 20及び図 21に示すように、前記連結機構 600は、前記第 2リンク側操作軸 551 の上端部に軸線回り相対回転不能に連結されたリンク側連結部材 610を備えている 本実施の形態においては、前記リンク側連結部材 610は、前記第 2リンク側操作軸 511の上端部に相対回転不能に外挿された中空部 611と、前記中空部 611を挟ん で互いに対向するように該中空部 611に連結された一対の支持板部 612とを有して いる。  As shown in FIGS. 20 and 21, the connection mechanism 600 includes a link side connection member 610 that is connected to the upper end portion of the second link side operation shaft 551 so as not to rotate relative to the axis. In this case, the link side connecting member 610 has a hollow portion 611 that is extrapolated to the upper end portion of the second link side operation shaft 511 so as not to be relatively rotatable, and the hollow portion 611 so as to face each other with the hollow portion 611 interposed therebetween. And a pair of support plate portions 612 connected to the portion 611.
[0081] さらに、前記連結機構 600は、前記第 2リンク側操作軸 551の軸線と交差するように 前記一対の支持板部 612に支持された枢支軸 620と、前記前後進切替操作部材 13 1の前記基準軸部 132に固着された状態で、前記枢支軸 620に外挿された軸受部 6 30と、前記前後進切替操作部材 131の前記基準軸部 132に径方向外方へ延在す るように設けられたディテント片 640と、前記ディテント片 640が挿通されるガイド孔 6 50と、前記前後進切替操作部材 131を前記枢支軸 620回り一方側へ付勢する中立 保持ばね 660とを備えて 、る。  [0081] Further, the coupling mechanism 600 includes a pivot shaft 620 supported by the pair of support plate portions 612 so as to intersect the axis of the second link side operation shaft 551, and the forward / reverse switching operation member 13. 1 is fixed to the reference shaft portion 132, and is extended radially outward to the bearing portion 630 externally attached to the pivot shaft 620 and the reference shaft portion 132 of the forward / reverse switching operation member 131. A detent piece 640 provided to be present, a guide hole 650 through which the detent piece 640 is inserted, and a neutral holding spring that urges the forward / reverse switching operation member 131 to one side around the pivot 620 It is equipped with 660.
[0082] 前記ガイド孔 650は、前記前後進切替操作部材 131が前記基準軸部 132の軸線 回りに回転する際に、前記ディテント片 640が前記基準軸部 132回りに揺動すること を許容し得るような大きさとされて 、る。  The guide hole 650 allows the detent piece 640 to swing around the reference shaft portion 132 when the forward / reverse switching operation member 131 rotates about the axis of the reference shaft portion 132. The size is such that you get.
さらに、前記ガイド孔 650には、前記前後進切替操作部材 131が中立位置に位置 された際に前記ディテント片 640と対向する位置に、該ディテント片 640が係入し得 る大きさのスリット 651が形成されている。 Further, the detent piece 640 can be engaged with the guide hole 650 at a position facing the detent piece 640 when the forward / reverse switching operation member 131 is positioned at the neutral position. A slit 651 of a certain size is formed.
[0083] 前記中立保持ばね 660は、前記ディテント片 640が前記スリット 651に係入される 方向へ前記軸受部 630を付勢している。  The neutral holding spring 660 urges the bearing portion 630 in a direction in which the detent piece 640 is engaged with the slit 651.
[0084] 斯カる構成の連結機構 600は、以下のように作動する。  [0084] The connection mechanism 600 having such a configuration operates as follows.
前記前後進切替操作部材 131が前記基準軸部 132の軸線回り中立位置に位置さ れて 、る状態にぉ 、て、該前後進切替操作部材 131に人為操作力が付与されて 、 ない場合には、前記中立保持ばね 660によって前記ディテント片 640が前記スリット 651内に係入される。この状態においては、前記ディテント片 640は前記基準軸部 1 32の軸線回りに回転不能に保持される。従って、前記前後進切替操作部材 131は、 前記中立位置に保持される。  When the forward / reverse switching operation member 131 is positioned at a neutral position around the axis of the reference shaft portion 132, and when the forward / reverse switching operation member 131 is not subjected to an artificial operation force, The detent piece 640 is engaged in the slit 651 by the neutral holding spring 660. In this state, the detent piece 640 is held so as not to rotate around the axis of the reference shaft portion 132. Therefore, the forward / reverse switching operation member 131 is held in the neutral position.
[0085] 前記前後進切替操作部材 131を中立位置から正転位置又は逆転位置へ操作する 場合には、まず、前記ディテント片 640が前記スリット 651から脱離する方向へ前記 中立保持ばね 660の付勢力に抗して前記前後進切替操作部材 131を前記枢支軸 6 20回りに揺動させる。この状態においては、前記ディテント片 640は、前記ガイド孔 6 50内において前記基準軸部 132回り揺動可能となる。従って、前記前後進切替操 作部材 131を前記基準軸部 132の軸線回りに回転させることで、前記リンク側連結部 材 610を介して前記第 2リンク側操作軸 551が軸線回りに回転する。  When operating the forward / reverse switching operation member 131 from the neutral position to the forward rotation position or the reverse rotation position, first, the neutral holding spring 660 is attached in the direction in which the detent piece 640 is detached from the slit 651. The forward / reverse switching operation member 131 is swung about the pivot shaft 620 against the force. In this state, the detent piece 640 can swing around the reference shaft 132 in the guide hole 650. Therefore, by rotating the forward / reverse switching operation member 131 around the axis of the reference shaft portion 132, the second link side operation shaft 551 rotates around the axis via the link side connecting member 610.
[0086] 好ましくは、前記ガイド孔 650の開口幅 (前記基準軸部 132の軸線に沿った方向の 開口長さ）と、前記ディテント片 640の幅 (前記基準軸部 132の軸線に沿った方向の 長さ）とを略同一とすることができる。  [0086] Preferably, the opening width of the guide hole 650 (the opening length in the direction along the axis of the reference shaft portion 132) and the width of the detent piece 640 (the direction along the axis of the reference shaft portion 132) Can be made substantially the same.
斯かる構成により、前記基準軸部 132回りの前記前後進切替操作部材 131の回転 操作を安定的に行うことができる。  With such a configuration, the forward / reverse switching operation member 131 around the reference shaft portion 132 can be stably rotated.
なお、本実施の形態においては、前記ガイド孔 650は、前記第 2リンク側支持部材 560の前記ベース部 561に形成されて!ヽる。  In the present embodiment, the guide hole 650 is formed in the base portion 561 of the second link side support member 560.
[0087] 次に、前記第 1リンク機構 510及び前記第 2リンク機構 550の連結構造について説 明する。  Next, a connection structure of the first link mechanism 510 and the second link mechanism 550 will be described.
図 18に示すように、本実施の形態においては、前記第 1リンク側第 1操作軸 511及 び前記第 2リンク側操作軸 551の対向端部が締結部材として作用するピン 540によつ て着脱可能に連結されて 、る。 As shown in FIG. 18, in the present embodiment, the opposing ends of the first link side first operating shaft 511 and the second link side operating shaft 551 are connected by a pin 540 that acts as a fastening member. And are detachably connected.
[0088] 詳しくは、本実施の形態においては、前記第 1リンク側第 1操作軸 511及び前記第 2リンク側操作軸 551は、前記エンジンユニット U2及び前記伝動ユニット U1を車輛 前後方向に相対移動させることによって、互いの軸線が同軸上に位置する軸線一致 状態と、互 、の軸線位置が変位された分離状態とをとり得るように配置されて！、る。 前記第 1リンク側第 1操作軸 511の上端部及び前記第 2リンク側操作軸 551の下端 部は、前記軸線一致状態の際に、側面視においてオーバーラップするように構成さ れている。そして、前記オーバーラップ部分を前記ピン 540によって連結することで 前記第 1リンク側第 1操作軸 511及び前記第 2リンク側操作軸 551が軸線回り相対回 転不能に連結され、且つ、前記ピン 540を外すことによって前記第 1リンク側第 1操作 軸 511及び前記第 2リンク側第 2操作軸 511が分離され得るようになつている（図 22 参照)。  Specifically, in the present embodiment, the first link side first operating shaft 511 and the second link side operating shaft 551 move the engine unit U2 and the transmission unit U1 relative to each other in the vehicle longitudinal direction. By doing so, they are arranged so that they can be in a state where the axes coincide with each other on the same axis and a separated state where the positions of the axes are displaced! RU The upper end portion of the first link side first operation shaft 511 and the lower end portion of the second link side operation shaft 551 are configured to overlap in a side view when the axes coincide with each other. The first link side first operation shaft 511 and the second link side operation shaft 551 are connected to each other so as not to rotate relative to each other around the axis by connecting the overlap portions with the pin 540, and the pin 540 The first link side first operating shaft 511 and the second link side second operating shaft 511 can be separated by removing (see FIG. 22).
[0089] 本実施の形態においては、図 18に示すように、前記第 2リンク側操作軸 551の下端 部には、凹状部材 541が設けられている。前記凹状部材 541は、水平方向に開くスリ ット 543を介して互いに対向する一対の支持板 542を有して 、る。  In the present embodiment, as shown in FIG. 18, a concave member 541 is provided at the lower end portion of the second link side operation shaft 551. The concave member 541 has a pair of support plates 542 facing each other via a slit 543 that opens in the horizontal direction.
一方、前記第 1リンク側第 1操作軸 511の上端部には、前記エンジンユニット U2及 び前記伝動ユニット U1を連結させた際に、前記スリット 543を介して前記一対の支持 板 542の間に配置される凸状部材 545が設けられている。  On the other hand, when the engine unit U2 and the transmission unit U1 are connected to the upper end portion of the first link side first operating shaft 511, the first link side first operation shaft 511 is interposed between the pair of support plates 542 via the slit 543. A convex member 545 is provided.
そして、前記凸状部材 545及び前記凹状部材 541が前記ピン 540によって連結さ れることで、前記第 1リンク側第 1操作軸 511及び第 2リンク側操作軸 551が軸線回り 相対回転不能に連結され得るようになって!/、る。  Then, by connecting the convex member 545 and the concave member 541 by the pin 540, the first link side first operation shaft 511 and the second link side operation shaft 551 are connected so as not to be relatively rotatable around the axis. I'm getting! /
[0090] 好ましくは、前記前後進切替操作部材 131を中立位置に位置させた際に、前記スリ ット 543が車輛前後方向を向くように構成され得る。 [0090] Preferably, when the forward / reverse switching operation member 131 is positioned at the neutral position, the slit 543 may be configured to face the vehicle longitudinal direction.
斯カる構成によれば、前記前後進切替機構 220を中立状態とさせた状態において 、前記エンジンユニット U2及び前記伝動ユニット U1の連結作業及び分離作業を行う ことができる。  According to such a configuration, the engine unit U2 and the transmission unit U1 can be connected and separated in a state where the forward / reverse switching mechanism 220 is in a neutral state.
[0091] 好ましくは、前記第 1操作リンク機構 510は、さらに、前記第 1リンク側第 2操作軸 51 5を軸線回り回転自在に支持する第 1リンク側第 2支持部材 520を備え得る（図 15参 照)。 [0091] Preferably, the first operation link mechanism 510 may further include a first link side second support member 520 that supports the first link side second operation shaft 515 so as to be rotatable about an axis (see FIG. 15 See).
本実施の形態においては、前記第 1リンク側第 2支持部材 520は、前記第 1リンク側 第 2操作軸 515が内挿された状態で、前記伝動ハウジング 290の右側面に固定され ている。  In the present embodiment, the first link side second support member 520 is fixed to the right side surface of the transmission housing 290 in a state where the first link side second operation shaft 515 is inserted.
斯カる第 1リンク側第 2支持部材 520を備えることにより、前記前後進切替操作部材 131への人為操作に応じた前記操作リンク構造 500の動作安定ィ匕を図ることができ る。  By providing such a first link side second support member 520, it is possible to achieve stable operation of the operation link structure 500 in response to an artificial operation to the forward / reverse switching operation member 131.
[0092] 即ち、前述の通り、本実施の形態に係る操作リンク構造 500においては、前記前後 進切替操作部材 131への人為操作に連動して、前記第 2リンク側操作軸 551,前記 第 1リンク側第 1操作軸 511及び前記第 1リンク側第 2操作軸 515が軸線回りに回転 する。  That is, as described above, in the operation link structure 500 according to the present embodiment, the second link side operation shaft 551, the first link are linked to the manual operation to the forward / reverse switching operation member 131. The link side first operation shaft 511 and the first link side second operation shaft 515 rotate around the axis.
前述の通り、前記第 2リンク側操作軸 551は前記第 2リンク側支持部材 560によって 軸線回り回転自在に支持され、且つ、前記第 1リンク側第 1操作軸 511は前記第 1リ ンク側第 1支持部材 530によって軸線回り回転自在に支持されている。  As described above, the second link side operation shaft 551 is supported by the second link side support member 560 so as to be rotatable about its axis, and the first link side first operation shaft 511 is the first link side first shaft. 1 Supported by a support member 530 so as to be rotatable about its axis.
従って、前記第 1リンク側第 2支持部材 520によって前記第 1リンク側第 2操作軸 51 5を支持することにより、軸線回りに回転するリンク部材 (即ち、第 1リンク側第 1操作軸 511,第 1リンク側第 2操作軸 515及び第 2リンク側操作軸 551)の全てを軸線回り回 転自在に支持することになり、これにより、前記前後進切替操作部材 131に連動する 前記操作リンク構造 500の動作安定ィ匕を図ることができる。  Accordingly, by supporting the first link side second operation shaft 515 by the first link side second support member 520, a link member that rotates about the axis (that is, the first link side first operation shaft 511, The first link-side second operation shaft 515 and the second link-side operation shaft 551) are all supported so as to be rotatable about the axis, and thereby the operation link structure interlocked with the forward / reverse switching operation member 131. 500 operation stability can be achieved.
[0093] なお、本実施の形態においては、本発明に係る操作リンク構造を、前記前後進切 替機構 220に適用した場合を例に説明したが、当然ながら、ギヤ式多段変速機構等 の種々の伝動機構に適用することも可能である。 In the present embodiment, the case where the operation link structure according to the present invention is applied to the forward / reverse switching mechanism 220 has been described as an example. It is also possible to apply to the transmission mechanism.

Claims

請求の範囲 The scope of the claims
[1] 駆動源力 出力部への伝動状態を変更させ得る伝動機構と前記伝動機構を操作 する為の人為操作部材とを連動連係するように作業車輛に適用される操作リンク構 造であって、  [1] Drive source force An operation link structure applied to a work vehicle so as to link a transmission mechanism capable of changing a transmission state to an output unit and an artificial operation member for operating the transmission mechanism. ,
前記伝動機構の切替操作部に連結された状態で、該伝動機構及び該伝動機構を 収容する伝動ハウジングを含む第 1ユニットに支持された第 1操作リンク機構と、 前記人為操作部材に連結された状態で、該人為操作部材を含む第 2ユニットに支 持された第 2操作リンク機構とを備え、  A first operation link mechanism supported by a first unit including the transmission mechanism and a transmission housing that accommodates the transmission mechanism in a state of being connected to the switching operation unit of the transmission mechanism; and connected to the artificial operation member A second operation link mechanism supported by a second unit including the artificial operation member in a state,
前記第 1及び第 2操作リンク機構は対応する前記ユニットに支持されたままで互い に対し着脱可能に連結されることを特徴とする操作リンク構造。  The operation link structure, wherein the first and second operation link mechanisms are detachably connected to each other while being supported by the corresponding units.
[2] 前記第 1操作リンク機構は、軸線回り回転可能な状態で略上下方向に沿って配設 された第 1リンク側操作軸を有し、 [2] The first operation link mechanism has a first link side operation shaft disposed substantially along the vertical direction so as to be rotatable about an axis.
前記第 2操作リンク機構は、前記人為操作部材への人為操作に応じて軸線回りに 回転する第 2リンク側操作軸であって、下端部が前記第 1リンク側操作軸の上端部と 対向した状態で該第 1リンク側操作軸に対して軸線回り相対回転不能に且つ着脱可 能に連結される第 2リンク側操作軸を有して 、ることを特徴とする請求項 1に記載の操 作リンク構造。  The second operation link mechanism is a second link side operation shaft that rotates about an axis in response to an artificial operation on the artificial operation member, and a lower end portion thereof is opposed to an upper end portion of the first link side operation shaft. 2. The operation according to claim 1, further comprising a second link-side operation shaft that is connected to the first link-side operation shaft so as not to rotate relative to the first link-side operation and to be detachable. Work link structure.
[3] 前記第 1ユニットは、前記伝動機構として作用する前後進切換機構と、他の伝動機 構として作用する変速機構と、前記前後進切換機構及び前記変速機構を収容する 前記伝動ハウジングとを備えた伝動ユニットとされており、  [3] The first unit includes a forward / reverse switching mechanism that functions as the transmission mechanism, a transmission mechanism that functions as another transmission mechanism, and the transmission housing that houses the forward / reverse switching mechanism and the transmission mechanism. It is considered as a transmission unit with
前記第 2ユニットは、前記駆動源として作用するエンジンと、ステアリングコラム，ス テアリングシャフト及びステアリングホイールを含むステアリング部と、前記ステアリン グコラムを囲繞するダッシュボード本体を含むダッシュボード部と、前記人為操作部 材として作用する前後進切替レバーを含む操作レバー部と、ブレーキペダルを含む 操作ペダル部と、前記エンジンの燃料源となる燃料タンクを含む燃料タンク部とを備 えたエンジンユニットとされていることを特徴とする請求項 2に記載の操作リンク構造。  The second unit includes an engine that acts as the driving source, a steering unit including a steering column, a steering shaft, and a steering wheel, a dashboard unit including a dashboard body surrounding the steering column, and the human operation unit. An engine unit including an operation lever portion including a forward / reverse switching lever acting as a material, an operation pedal portion including a brake pedal, and a fuel tank portion including a fuel tank serving as a fuel source of the engine. 3. The operation link structure according to claim 2, wherein
[4] 前記第 1リンク側操作軸は、前記伝動ハウジングに設けられた第 1リンク側支持部材 によって直接的又は間接的に軸線回り回転自在に支持され、 前記第 2リンク側操作軸は、前記ステアリングコラムに設けられた第 2リンク側支持部 材によって直接的又は間接的に軸線回り回転自在に支持されていることを特徴とす る請求項 3に記載の操作リンク構造。 [4] The first link side operation shaft is supported by a first link side support member provided in the transmission housing so as to be directly or indirectly rotatable about an axis, 4. The second link side operation shaft is supported by a second link side support member provided on the steering column so as to be directly or indirectly rotatable about an axis line. Operation link structure.
[5] 前記第 1及び第 2ユニットは車輛前後方向に沿って連結されており、 [5] The first and second units are connected along the longitudinal direction of the vehicle,
前記第 1及び第 2リンク側操作軸は、前記第 1及び第 2ユニットを車輛前後方向に 相対移動させることによって、互いの軸線が同軸上に位置する軸線一致状態と、互 V、の軸線が変位された分離状態とをとり得るように構成されており、  The first and second link side operation shafts move relative to each other in the vehicle front-rear direction to move the first and second units in the vehicle front-rear direction so that the axes coincide with each other on the same axis and the axes of the two V are the same. It is configured to be able to take a displaced separation state,
前記第 1リンク側操作軸の上端部及び前記第 2リンク側操作軸の下端部は、前記軸 線一致状態の際に、側面視においてオーバーラップするように構成されており、 前記オーバーラップ部分を締結部材によって連結することで、前記第 1及び第 2リン ク側操作軸が軸線回り相対回転不能に連結されることを特徴とする請求項 3又は 4に 記載の操作リンク構造。  The upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft are configured to overlap in a side view when the axes coincide with each other. 5. The operation link structure according to claim 3, wherein the first and second link side operation shafts are connected so as not to be relatively rotatable around an axis by being connected by a fastening member.
[6] 前記第 1リンク側操作軸の上端部及び前記第 2リンク側操作軸の下端部の一方に は、水平方向に開くスリットを介して互いに対向する一対の支持板を有する凹状部材 が設けられ、 [6] One of the upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft is provided with a concave member having a pair of support plates facing each other through a slit that opens in the horizontal direction. And
前記第 1リンク側操作軸の上端部及び前記第 2リンク側操作軸の下端部の他方に は、前記スリットを介して前記一対の支持板の間に配置される凸状部材が設けられて おり、  The other of the upper end portion of the first link side operation shaft and the lower end portion of the second link side operation shaft is provided with a convex member disposed between the pair of support plates via the slit.
前記凸状部材及び前記凹状部材が前記締結部材によって連結されることで、前記 第 1及び第 2リンク側操作軸が軸線回り相対回転不能に連結されることを特徴とする 請求項 5に記載の操作リンク構造。  The said convex member and the said concave member are connected by the said fastening member, The said 1st and 2nd link side operating shaft is connected so that a relative rotation is impossible around an axis line. Operation link structure.
[7] 前記伝動機構は、前記駆動源力 前記出力部への動力伝達を遮断する中立状態 をとり得るように構成されており、 [7] The transmission mechanism is configured to be in a neutral state in which power transmission to the driving force and the output unit is interrupted,
前記伝動機構を中立状態とさせる中立位置に前記人為操作部材を位置させた際 に、前記スリットは車輛前後方向を向くことを特徴とする請求項 6に記載の操作リンク 構造。  7. The operation link structure according to claim 6, wherein the slit faces the vehicle front-rear direction when the artificial operation member is positioned at a neutral position where the transmission mechanism is in a neutral state.
[8] 前記ダッシュボード本体は、前記エンジンに連結されたダッシュボードスティに支持 されており、 前記第 1及び第 2リンク側操作軸は、前記伝動ハウジングの上面より上方で且つ前 記ダッシュボードスティ及び前記ダッシュボード本体よりも下方であって、車輛側方か らアクセス可能な位置において、前記締結部材によって連結されていることを特徴と する請求項 5から 7の何れかに記載の操作リンク構造。 [8] The dashboard main body is supported by a dashboard stay connected to the engine, The first and second link side operation shafts are above the upper surface of the transmission housing and below the dashboard stay and the dashboard body, and are accessible at the vehicle side. The operation link structure according to claim 5, wherein the operation link structure is connected by a fastening member.
前記第 1リンク側支持部材は、前記伝動ハウジングの上面に固着された底板及び 該底板から上方へ延びる一対の側板を含む本体部と、前記本体部の前方側に位置 するように該本体部に支持された軸受部とを有しており、  The first link side support member includes a main body including a bottom plate fixed to an upper surface of the transmission housing and a pair of side plates extending upward from the bottom plate, and the main body is positioned on the front side of the main body. And a supported bearing portion,
前記一対の側板は、それぞれ、前記ダッシュボードスティにおける一対の側板に締 結部材を介して着脱可能に連結されていることを特徴とする請求項 8に記載の操作リ ンク構造。  9. The operation link structure according to claim 8, wherein each of the pair of side plates is detachably connected to a pair of side plates of the dashboard stay via a fastening member.
PCT/JP2007/055023 2006-06-28 2007-03-14 Operation link structure WO2008001516A1 (en)

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