CN100451385C - Gearbox for tractor - Google Patents

Abstract

A transmission for a tractor having a change speed device operable when an engine and the transmission are connected to transmit, in varied speeds, power from the engine to a driving wheel, a main drive shaft for receiving power from the engine when the engine and the transmission are connected, and a reverse and forward drive switching device disposed between the engine and the change speed device operable to switch a direction of rotation of power from the engine. The reverse and forward drive switching device being shiftable between a high-speed forward drive position, a low-speed forward drive position, and a reverse drive position, and including a high-speed forward drive clutch, a low-speed forward drive clutch, and a reverse drive clutch wherein each clutch is mounted on the main drive shaft for switching the reverse and forward drive switching device to each respective clutch drive position.

Description

The speed changer that is used for tractor

Technical field

The present invention relates to be used for the speed changer of tractor.

Background technique

The power transmitting deice (opening flat 4-107348 number) that a kind of tractor is arranged in the prior art with reference to the spy, this power transmitting deice constitutes as follows, that is: motor and will power speed changing from this motor after pass to the COMM communication that seesaws (being sometimes referred to as the to-and-fro motion gearshift) that the sense of rotation of switching power is set between the speed change gear of driving wheel, this COMM communication that seesaws can be 2 grades of height with the speed change of advancing, and also comprises: will be the high-speed clutch that advances of high-speed side of advancing from the powershift of motor; To be the low-speed clutch that advances of low speed side of advancing from the powershift of motor; To be the back clutch that retreats side from the powershift of motor, the power transmitting deice of this tractor constitutes described these clutches by the wet multi-plate hydraulic coupling.

In this power transmitting deice, the high-speed clutch that will advance be arranged on the direct-connected cardan shaft of the output shaft of motor on, will advance low-speed clutch and back clutch are arranged on the jack shaft of the below that is configured in above-mentioned cardan shaft.

The constituted mode of wet multi-plate hydraulic coupling is as follows, promptly by pressure oil being supplied to the back side of piston, driven plunger with driving plate and clutch plate roof pressure on pressing plate, come transferring power thus, but the oil circuit that pressure oil is transported to this piston back side is formed on the axle that clutch is set.

In above-mentioned existing power transmitting deice, high-speed clutch is arranged on the cardan shaft because will advance, to advance low-speed clutch and back clutch is arranged on the jack shaft, so must form the oil circuit of supply pressure oil usefulness respectively, has room for improvement thus in design.

High-speed clutch, advance low-speed clutch and back clutch have been arranged on 1 axle owing to will advance, so as when these clutches of hydraulic control, can realize the simplification of the Clutch Control structure of oil circuit etc.

Summary of the invention

The objective of the invention is, in view of the problem of above-mentioned prior art and a kind of power transmitting deice of improved tractor is provided.

The speed changer that is used for tractor of the present invention comprises: speed change gear when motor that connects above-mentioned tractor and speed changer, is delivered to driving wheel after making the power speed changing from above-mentioned motor; Cardan shaft when motor that connects above-mentioned tractor and speed changer, transmits the power from above-mentioned motor; COMM communication seesaws, when motor that connects above-mentioned tractor and speed changer, be configured between above-mentioned motor and the above-mentioned speed change gear, switching is from the sense of rotation of the driving force of above-mentioned motor, this COMM communication that seesaws can high speed position, the low-speed position when advancing and going-back position when advancing between displacement, this COMM communication that seesaws has: high-speed clutch advances, be installed on the above-mentioned cardan shaft, the above-mentioned COMM communication that seesaws is switched on the above-mentioned high speed position of advancing; The low-speed clutch that advances is installed on the above-mentioned cardan shaft, and the above-mentioned COMM communication that seesaws is switched on the above-mentioned low-speed position; Back clutch is installed on the above-mentioned cardan shaft, and the above-mentioned COMM communication that seesaws is switched on the above-mentioned going-back position; The 1st input gear; The 2nd input gear; The high speed of advancing output gear is meshed with above-mentioned the 1st input gear and by the high-speed clutch transmission onward impulse that advances, the high speed transmission of power of will advancing thus is to speed change gear; The low speed output gear that advances is meshed with above-mentioned the 2nd input gear and transmits onward impulse by the low-speed clutch that advances, and the low speed transmission of power of will advancing thus is to speed change gear; Retreat driving gear, be meshed and retreat power, will retreat transmission of power thus and arrive above-mentioned speed change gear by the back clutch transmission with a side of above-mentioned the 1st input gear and the 2nd input gear.

Description of drawings

Fig. 1 is the unfolded drawing of the side cross-sectional of the expression COMM communication that seesaws of the present invention.

Fig. 2 is the side cross-sectional, view of the front portion of power transmitting deice.

Fig. 3 is the side cross-sectional, view at the rear portion of power transmitting deice.

Fig. 4 is the block diagram of control system of COMM communication of seesawing.

Fig. 5 is the side cross-sectional, view of the speed change gear of 4 grades of formulas of main transformer speed.

Fig. 6 is the side cross-sectional, view of the front portion of power transmitting deice.

The back side sectional view of Fig. 7 clutch housing and lid etc.

Fig. 8 is the side view of lid.

Fig. 9 be among Fig. 8 along the A-A line to looking sectional view.

Figure 10 is that the main transformer quick-mounting is put, the side view of the gearshift mechanism of secondary speed-changing device and wriggling speed change gear.

Figure 11 be among Fig. 8 along the B-B line to looking sectional view.

Figure 12 be among Fig. 9 along the C-C line to looking sectional view.

Figure 13 is that the main transformer quick-mounting is put, the plan view of the gearshift mechanism of secondary speed-changing device and wriggling speed change gear.

Figure 14 is the top cross-sectional view of the operating device put of main transformer quick-mounting.

Figure 15 is the bottom surface sectional view of secondary speed-changing device and wriggling speed change gear.

Figure 16 is the cross section enlarged view of the gear shift part of secondary speed-changing device and wriggling speed change gear.

Figure 17 is the side cross-sectional, view of the speed change gear of 6 grades of formulas of main transformer speed.

Figure 18 is the corresponding figure of Figure 11 with the speed change gear of 6 grades of formulas of main transformer speed.

Figure 19 is the corresponding figure of Figure 10 with the speed change gear of 6 grades of formulas of main transformer speed.

Figure 20 is the corresponding figure of Figure 14 with the speed change gear of 6 grades of formulas of main transformer speed.

Figure 21 is the side cross-sectional, view that the main transformer quick-mounting described in other mode of execution is put.

Figure 22 be the expression hydraulic type PTO clutch that has an inertia braking mechanism of the present invention mode of execution want portion's longitudinal cross-section side view.

Figure 23 is the clutch body and the plan view that is braked the engagement portion structure of plate among expression Figure 22.

Figure 24 is the longitudinal cross-section side view that is suitable for the whole transmission mechanism of tractor of the present invention.

Figure 25 be the pump power carry-out part want portion's longitudinal cross-section side view.

Figure 26 be expression Figure 25 variant embodiment the pump power carry-out part want portion's longitudinal cross-section side view.

Embodiment

Below, with reference to the accompanying drawings the working of an invention mode is described.

The present invention includes a plurality of mode of executions, but only otherwise conflicting, the specific feature in mode of execution also is applicable to other mode of execution, and such situation is also included within the scope of the present invention.

1 is clutch housing in Fig. 2, this clutch housing 1 is connected on the rear end side of the flywheel casing 2 that is connected with the side, rear end of motor, in Fig. 3, the 3rd, be connected the gearbox on the rear end side of clutch housing 1, the rear end side opening of this gearbox 3 is with 4 sealings of rear portion lid.

The transmission case 5 of the part of the car body of formation tractor is made of above-mentioned clutch housing (anterior casing) 1 and gearbox (rear portion casing) 3, and the car body of tractor mainly is made of this transmission case 5, motor, flywheel casing 2 etc.

Hold dynamic transfer unit 7 in above-mentioned transmission case 5, this power transmitting deice 7 has: the PTO system dynamic delivery system that will unify and pass to PTO axle 6 for the driving system power conveying system of driving wheel from the transmission of power of motor.

The driving system of this power transmitting deice 7 comprises: cardan shaft 10, from the bent axle 8 of motor through flywheel 9 even flowing; Speed change gear 11, the conversion moment of torsion will be arriving trailing wheel (driving wheel) etc. from the transmission of power of this cardan shaft 10; The COMM communication that seesaws (reciprocating mechanism) 12 changes the sense of rotation of 11 power that transmit from cardan shaft 10 towards speed change gear, thereby switches seesawing of tractor; Trailing wheel differential motion 13, the trailing wheel about will arriving from the transmission of power of speed change gear 11; Front-wheel cardan shaft 14 will be through the transmission of power behind the speed change gear 11 to front-wheel (driving wheel).

Cardan shaft 10 and front-wheel cardan shaft 14 have the axis of fore-and-aft direction.

In addition, the PTO system of power transmitting deice 7 comprises: PTO live axle 16 directly is connected on the rear portion of above-mentioned cardan shaft 10 coaxially; PTO transmission shaft 17 is arranged on the rear of this PTO live axle 16 coaxially; PTO clutch 18 is delivered to PTO transmission shaft 17 from PTO live axle 16 with power freely being communicated with/disconnecting; Speed reducer (PTO gear) 19 makes from the dynamic retarding of PTO transmission shaft 17 and is delivered to PTO transmission shaft 6.

The toe lateral of cardan shaft 10 is propped up through bearing and is held on the next door 22,22 pairs in this next door is provided with Room 20 the 1st of the clutch housing 1 of flywheel 9 and divides with the Room 21 the 2nd that is provided with the clutch housing 1 of the COMM communication 12 that seesaws, the rear portion side of cardan shaft 10 is propped up through bearing and is held on the partition 25, and 25 pairs of above-mentioned Room 21 the 2nd of this partition are divided with the Room 24 the 3rd that is provided with the clutch housing 1 of speed change gear 11.

As Fig. 1 and shown in Figure 2, the sense of rotation of the both changeable rotational power from cardan shaft 10 of the COMM communication that seesaws 12, thereby onward impulse or retreat transmission of power to speed change gear 11, but also can be two-stage just with the onward impulse speed change.Fig. 1 is a unfolded drawing, and the input shaft 32 of cardan shaft 10, aftermentioned explanation and the axial direction that retreats transmission shaft 28b are configured in respectively on the position of the axle shown in 16 shown in Fig. 7,129 and 144 places to the position of looking.Thereby input shaft 32 is configured in cardan shaft 10 and retreats the side of the position between the transmission shaft 28b, and parallel with cardan shaft 10.

This COMM communication 12 that seesaws comprises: the high gear that advances is 26, and 11 transmit the high speed power that advances from cardan shaft 10 towards speed change gear; The high-speed clutch 27 that advances is 26 transferring power intermittently towards this high gear that advances; Backward gear driving mechanism 28,11 transmission retreat power from cardan shaft 10 towards speed change gear; Back clutch 29 is towards this backward gear driving mechanism 28 transferring power intermittently; The low speed gear train 30 that advances, 11 transmit the low speed power that advances from cardan shaft 10 towards speed change gear; The low-speed clutch 31 that advances is towards this low speed gear train 30 transferring power intermittently of advancing.

The high gear that advances is 26 to comprise: the high speed of advancing output gear 26a, be embedded in cardan shaft 10 outward, and support with rotating relatively freely; The 1st input gear 26b, the outer freely to rotate input shaft 32 that is embedded in speed change gear 11 becomes one with input shaft 32, and is meshed with the above-mentioned high speed output gear 26a that advances, to import power towards speed change gear 11.

The low speed gear train 30 that advances comprises: the low speed output gear 30a that advances, be embedded in cardan shaft 10 outward, and support with rotating relatively freely; The 2nd input gear 30b, the outer freely to rotate input shaft 32 that is embedded in speed change gear 11 becomes one with input shaft 32, and is meshed with the above-mentioned low speed output gear 30a that advances, to import power towards speed change gear 11.

Backward gear driving mechanism 28 comprises: retreat output gear 28a, be embedded in cardan shaft 10 outward, support with rotating relatively freely; Retreat transmission shaft 28b, be configured in the lower side of cardan shaft 10, parallel with this cardan shaft 10, twelve Earthly Branches free to rotate are held between next door 22, the partition 25; Counter gear 28c, one is embedded in this freely to rotate and retreats transmission shaft 28b, and is meshed with the above-mentioned output gear 28a that retreats, to switch sense of rotation; Retreat driving gear 28d, one is outer freely to rotate to be embedded in the above-mentioned transmission shaft 28b that retreats, and is meshed with above-mentioned the 2nd input gear 30b, thereby will retreat transmission of power to speed change gear 11.

The input shaft 32 of above-mentioned speed change gear 11 is configured in the right side of cardan shaft 10 and PTO live axle 16, and parallel with this cardan shaft 10 and PTO live axle 16, the middle part of this input shaft 32 is supported at partition 25 through bearing, the rear portion is supported at through bearing and is used for the front bulkhead 33 of gearbox 3 of open rearward end of closed clutch housing 1, the front portion of input shaft 32 is outstanding from partition 25 towards front side, on the part of giving prominence to, be provided with the above-mentioned the 1st towards Room 21 the 2nd, the 2nd input gear 26b, 30b, the 1st input gear 26b is configured in the forward end of input shaft 32, the 2nd input gear 30b is configured near the front side of partition 25.

Advance high-speed clutch 27, advance low-speed clutch 31 and back clutch 29 is made of hydraulic coupling, described hydraulic coupling is worked by pressure oil being supplied to these clutches 27,31 and 29, in the present embodiment, constitute by wet multi-plate clutch, and be to be provided with as follows, be about to its with axle direction shape in upright arrangement be configured on the cardan shaft 10.

In the present embodiment, order from the front by the high-speed clutch 27 that advances, back clutch 29 and the low-speed clutch 31 that advances disposes, the high speed of will advancing output gear 26a is configured in the front side of the high-speed clutch 27 that advances, the front side that output gear 28a is configured in back clutch 29 will be retreated, the low speed output gear 30a that will advance is configured in the rear side of the low-speed clutch 31 that advances, counter gear 28c is configured in the below that retreats output gear 28a, will retreats the below that driving gear 28d is configured in the low speed output gear 30a that advances.

Advance high-speed clutch 27, advance low-speed clutch 31 and back clutch 29 comprises: clutch body 34, and coaxial wire ground is fixed on the cardan shaft 10, with cardan shaft 10 unitary rotation; Piston 35 is arranged in this clutch body 34; Inner barrel 36 is arranged on the cardan shaft 10 to coaxial wire, and freely rotates with respect to cardan shaft 10; Pressing plate 37 is with clutch body 34 unitary rotation; Driving plate 38 and clutch plate 39 are replacing the status between this pressing plate 37 and piston 35 on the axial direction.

Driving plate 38 and clutch body 34 unitary rotation, clutch plate 39 and inner barrel 36 unitary rotation, advance high-speed clutch 27 inner barrel 36 with advance high speed output gear 26a unitary rotation, advance low-speed clutch 31 inner barrel 36 with advance low speed output gear 30a unitary rotation, the inner barrel 36 of back clutch 29 with retreat output gear 28a unitary rotation.

In addition, in the present embodiment, the clutch body 34 of back clutch 29 and the clutch body 34 of the low-speed clutch 31 that advances are integrally formed, thereby realize versatility.

In the clutch 27,29,31 of said structure, by back side supply pressure oil towards piston 35, make this piston 35 towards pressing plate 37 side shiftings, this piston 35 had both promoted driving plate 38, but also promote clutch plate 39, their roof pressures are crimped on the pressing plate 37, are thus connected clutch 27,29,31, clutch body 34, driving plate 38, pressing plate 37, clutch plate 39 and inner barrel 36 and cardan shaft unitary rotation.

In addition, by the back side head pressure oil from piston 35, piston is got back to initial position under the effect of Returnning spring 40, and driving plate 38 oppositely separates with clutch plate 39, thereby cuts off clutch 27,29,31.

And, by the connection high-speed clutch 27 that advances, the high speed of will advancing power is 26 to be delivered to input shaft 32 through the high gear that advances, by the connection low-speed clutch 31 that advances, the low speed power that will advance is delivered to input shaft 32 through the low speed gear train 30 that advances, in addition, by connecting back clutch 29, will retreat power and be delivered to input shaft 32 through backward gear driving mechanism 28.

Be formed with the 1st oil circuit 41a, the 2nd oil circuit 41b, the 3rd oil circuit 41c on cardan shaft 10, they are on the axle direction of cardan shaft 10 and be parallel to each other, the 1st oil circuit 41a be used for the marching forward back side supply pressure oil of piston 35 of high-speed clutch 27; The 2nd oil circuit 41b be used for the drawing back back side supply pressure oil of piston 35 of clutch 29; The 3rd oil circuit 41c be used for the marching forward back side supply pressure oil of piston 35 of low-speed clutch 31.

In addition, on the outer circumferential face of the part on the next door 22 that is interspersed in cardan shaft 10, forming the 1st all groove 45a, the 2nd all groove 45b, the 3rd all groove 45c, above-mentioned the 1st oil circuit 41a is communicated in the 1st all groove 45a, above-mentioned the 2nd oil circuit 41b is communicated in the 2nd all groove 45b, above-mentioned the 3rd oil circuit 41c is communicated in the 3rd all groove 45c, selection is from shuttle valve 42 described later, the pressure oil of high low speed switching valve 44, and supply to the above-mentioned the 1st all groove 45a, the 2nd all groove 45b, a certain all grooves among the 3rd all groove 45c make the high-speed clutch 27 that advances thus, a certain clutch work in the back clutch 29 and the low-speed clutch 31 that advances.

In the COMM communication 12 that seesaws of said structure, the high-speed clutch 27 that advances that will be made of hydraulic coupling, advance low-speed clutch 31 and back clutch 29 are arranged on the cardan shaft 10 with being axle direction shape in upright arrangement, so when the oil circuit 41a that on these clutches 27,31,29, forms supply pressure oil～c, but simplification of implementation structure.

When seesawing of tractor switched, for example want near the operating devices such as rocker arm of operation setting handle, can switch shuttle valve 42 by this rocker arm.

As shown in Figure 4, the pressure oil of self-hydraulic pump P supplies to shuttle valve 42 in the future, by clutch 27,31 or the back clutch 29 of path (flowing) pressure oil is supplied to advance side of these shuttle valve 42 switchable pressure oil.

In addition, immediately, pressure oil can not supply to the clutch 27,31 of advance side or the either party in the back clutch 29 in shuttle valve 42.

In addition, on the hydraulic path between the clutch 27,31 of shuttle valve 42 and advance side, be provided with and be used for the high low speed switching valve 44 of path (flowing) of switch pressure oil, thereby the pressure oil that will be supplied to through shuttle valve 42 supplies to the advance high-speed clutch 27 or the low-speed clutch 31 that advances.

The handover operation of this high low speed switching valve 44 for example is to be undertaken by near the operating devices such as high low speed changer lever that are arranged on the driver's seat.

In the above-described configuration, be used for the high low speed switching valve 44 of path (flowing) of switch pressure oil being provided with between the clutch of the shuttle valve 42 of the switching that seesaws and advance side or between the clutch 27,31 in shuttle valve 42 and advance side, supplying to the advance high-speed clutch 27 or the low-speed clutch 31 that advances through the pressure oil that shuttle valve 42 is supplied with.

The handover operation of this high low speed switching valve 44 for example is to be undertaken by near the operating devices such as high low speed changer lever that are arranged on the driver's seat.

At the clutch 27 of shuttle valve 42 with advance side, device has high low speed switching valve 44 between the hydraulic path between 31, this high low speed switching valve 44 can supply to pressure oil the advance high-speed clutch 27 or the low-speed clutch 31 that advances, thus, advance high-speed clutch 27 or advance low-speed clutch 31 and will switch high low speed switching valve 44 for pressure oil is supplied to, under the situation after the switching, shuttle valve 42 is carried out handover operation, thereby not only can make the function of shuttle valve 42 performances, and can control the high-speed clutch 27 that advances by the regulatory function or the fine motion function of shuttle valve 42 as main clutch, low-speed clutch 31 advances, back clutch 29.

Above-mentioned shuttle valve 42 and high low speed switching valve 44 are installed on the gearbox 3, from these valves 42,44, hydraulic pipe lines such as oil circuit through on the wall portion of gearbox 3 and next door 22 etc., forming and pipeline, the arbitrary all groove supply pressure oil among all groove 45a～c of the above-mentioned the 1st～3 on being arranged on cardan shaft.

Above-mentioned shuttle valve 42 and high low speed switching valve 44, other power steering control valve, aux. control valve, to the oil hydraulic pump P of hydraulic equipment supply pressure oil such as hydraulic type lifting device of working machine, constitute by duplex pump, be installed in the front upper part of the right flank of gearbox 3 with 2 adjacent gear pumps of the left and right sides.

Next, describe for the 2nd mode of execution that is contained in the COMM communication 112 that seesaws in the Room 21 the 2nd and the speed change gear 111 that is contained in the Room 24 the 3rd.

The COMM communication 112 that seesaws of the 2nd mode of execution is not equipped with the mechanism of speed change for 2 grades of height that advance.

The COMM communication that seesaws 112 comprises: be arranged on the forward clutch 126 on the cardan shaft 10; The output gear 127 that advances at the rear side of this forward clutch 126, rotates relatively freely twelve Earthly Branches and is held on the cardan shaft 10; Back clutch 123; Retreat output gear 128,, freely prop up with relatively rotating and be held on the cardan shaft 10 in the front side of this back clutch 123; Retreat transmission shaft 129, be configured in the lower side of cardan shaft 10, parallel, prop up freely to rotate and be held in 25 of next door 22, partitions with this cardan shaft 10; Retreat the 1st driving gear 130, one is arranged on this front portion that retreats transmission shaft 129 freely to rotate; Retreat the 2nd driving gear 131, one is arranged on the rear portion that retreats transmission shaft 129 freely to rotate.

Advance output gear 127 and retreat the 2nd driving gear 131 and be meshed with the input gear 132 of input power in speed change gear 111 retreats the 1st driving gear 130 and retreats output gear 128 and be meshed.

Forward clutch 126 and back clutch 123 are made of the wet multi-plate hydraulic coupling, this wet multi-plate hydraulic coupling is fixed on the general clutch body 133 on the cardan shaft 10 with having coaxial line, make by hydraulic pressure and to advance with piston 138 or retreat with piston 139 work, with the driving plate of crimping and clutch body 133 unitary rotation and with advance output gear 127 or retreat the clutch plate of output gear 128 unitary rotation, thus, in the future the transmission of power of self-propelled axle 10 is to advancing output gear 127 or retreat output gear 128, output gear 127 transmits onward impulse to above-mentioned input gear 132 from advancing, or, transmit to above-mentioned input gear 132 and retreat power via retreating output gear 128 → retreat the 1st driving gear 130 → retreat transmission shaft 129 → retreat the 2nd driving gear 131.

In addition, when advancing with piston 138 or retreating with piston 139, just can not be delivered to from the power of cardan shaft 10 and to advance output gear 127 or to retreat output gear 128 to inoperative.

Below, describe for the speed change gear 111 that is contained in the Room 24 the 3rd.

Speed change gear 111 comprises: 4 grades the main transformer quick-mounting that can be the 1st speed～the 4th speed with the power speed changing through the COMM communication 112 that seesaws puts 141; Can be the secondary speed-changing device 142 of 2 grades of height further with the power speed changing of putting 141 through this main transformer quick-mounting; The power speed changing of putting through the main transformer quick-mounting after 141 can be the wriggling speed change gear 143 of the Ultra-Low Speed also slower than the low speed of secondary speed-changing device 142; Input shaft 144 from front and back movement means 112 input power; Put the jack shaft 145 of 141 transferring power through the main transformer quick-mounting from this input shaft 144; Output is by the output shaft 146 of the power after speed change gear 111 speed changes.

Input shaft 144 is configured in the right side of the rear side and the PTO live axle 16 of the COMM communication 112 that seesaws, and parallel with PTO live axle 16, the front portion of this input shaft 144 is propped up through bearing and is held on the partition 25, prop up through bearing on the front bulkhead 147 of gearbox 3 of the open rearward end that is held in closed clutch housing 1 at the rear portion, the front end of input shaft 144 is forwards side-prominent from partition 25, and one is provided with above-mentioned input gear 132 freely to rotate on the part of giving prominence to towards Room 21 the 2nd.

Make the front end motion COMM communication forwards, backwards 112 of input shaft 144 side-prominent, input gear 132 is set on this projection, with the side that input shaft 144 is configured in cardan shaft 10 and retreats 129 of transmission shafts, can make input gear 132 thus and advance output gear 127 and retreat the 2nd driving gear 131 and mesh simultaneously.

Jack shaft 145 be shaped as tubular, rotate relatively freely the extraterrestrial above-mentioned PTO live axle 16 that is embedded in.

Output shaft 146 has the axis of fore-and-aft direction, be configured in parellel the above-mentioned rear that retreats transmission shaft 129 jack shaft 145 under, with this output shaft 146 through bearing, to prop up freely to rotate around the mode of rotational on the front bulkhead 147 that is held in partition 25 and gearbox 3, and insert in the gearbox 3, the rear end side of this output shaft 146 is connected on the differential mechanism live axle 48 of trailing wheel differential motion 13 transferring power through coupling.

Thereby, with the configuration mutually of these input shafts 144, jack shaft 145 and output shaft 146 parellel ground, and be configured on leg-of-mutton each summit.

As shown in Figure 5, the main transformer quick-mounting is put 141 and is comprised: the train of gearings 149～152 of the 1st～the 4th speed, adopt the gear of synchromesh, from input shaft 144 to jack shaft 145 transferring power; 1st, the 2nd main transformer speed switch clutch 155,156 switches the transmission of power path, with train of gearings 149～152 transferring power of a certain train of gearings in the train of gearings 149～152 of the 1st～the 4th speed.

The train of gearings 149～152 that makes above-mentioned the 1st～the 4th speed is backward by the arranged in order of the 4th fast train of gearings the 152, the 3rd train of gearings the 151, the 2nd fast train of gearings the 150, the 1st fast train of gearings 149, between the 3rd train of gearings 151 and the 2nd fast train of gearings 150, be provided with space 140 (spacer), the train of gearings of appending 2 grades on 141 can be put at the main transformer quick-mounting in this space 140, in the present embodiment, the main transformer quick-mounting is put 141 and can be transformed into 6 grades of speed changing types from 4 grades of speed changing types.

The driving side gear 149a～152a of the train of gearings 149～152 of the 1st～the 4th speed is rotated relatively freely the extraterrestrial input shaft 144 that is embedded in, will be driven the outer freely to rotate jack shaft 145 that is embedded in of side gear 149b～154b one.

The 1st main transformer speed switch clutch 155 is arranged between driving side gear 149a, the 150a of the 1st fast train of gearings 149 and the 2nd train of gearings 150, carry out the switching of 1 speed or 2 speed, the 2nd main transformer speed switch clutch 156 is arranged between driving side gear 151a, the 152a of the 3rd fast train of gearings 151 and the 4th fast train of gearings 152, carries out the switching of 3 speed or 4 speed.

The 1st main transformer speed switch clutch the 155, the 2nd main transformer speed switch clutch 156 adopts the synchronous mode clutch, this synchronous mode clutch has adopted and has made power transmission side (input shaft 144) and synchronous from the revolution of power back flow side (the main transformer quick-mounting is put the driving side gear of 141 train of gearings), to switch the synchromesh mechanism of (gear shift) train of gearings 149～152, each main transformer speed switch clutch 155,156 comprises: coupling 155a, 156a, the outer freely to rotate input shaft 144 that is embedded in of one; Main transformer speed gearshift (clutch gear) 155b, 156b, one is freely rotated and is moved freely extraterrestrial this coupling 155a, the 156a of being embedded at axial direction (fore-and-aft direction).

The main transformer speed of the 1st main transformer speed switch clutch 155 is called the 1st main transformer speed gearshift 155b with gearshift 155b, and the main transformer speed of the 2nd main transformer speed switch clutch 156 is called the 2nd main transformer speed gearshift 156b with gearshift 156b.

Between the driving side gear 150a of the driving side gear 151a of the 3rd fast train of gearings 151 of input shaft and the 2nd fast train of gearings 150, also be formed with spline, this spline is used for the coupling etc. of the chimeric main transformer speed switch clutch that appends, between driving side gear 151a, the 150a of the 3rd fast train of gearings 151 and the 2nd fast train of gearings 150, the spacing body 158 of tubular in outer embedding.

On the driving side gear 149a～152a of the train of gearings 149～152 of the 1st～the 4th speed, be respectively equipped with and the 1st, the 2nd main transformer speed gearshift 155b, the engaging piece 149c 152c that 156b is meshed, the 1st, the 2nd main transformer speed gearshift 155b, 156b is not non-power transmission state with the intermeshing state of this engaging piece 149c 152c, this non-power transmission state can not be delivered to jack shaft 145 through the train of gearings 149～152 of 1 4th speed from input shaft 144 with power, therefore be in the neutral position, make the 1st, the 2nd main transformer speed gearshift 155b, a certain side among the 156b slides from the neutral position to axial direction (fore-and-aft direction), a certain side and coupling 155a in engaging piece 149c～152c of the driving side gear 149a～152a of the train of gearings 149～152 of the 1st～the 4th speed, be meshing with each other on the 156a, be constructed as follows structure thus, that is: through input shaft 144 → coupling 155a, 156a → main transformer speed gearshift 155b, 156b → engaging piece 149c～152c → driving side gear 149a～152a → be driven side gear 149b～154b, to jack shaft 145 transferring power, the power that is input to input shaft 144 is become the main transformer quick-mounting to put a certain side in the 1st speed～the 4th speed of 141 by speed change selectively, transmits to jack shaft 145.

As Fig. 6 and shown in Figure 7, on the sidewall on the right side of clutch housing 1, form opening portion 159, this opening portion 159 can seal by the lid 160 that is installed on the clutch housing 1 with freely loading and unloading.

As Fig. 8～shown in Figure 14, on this lid 160, be provided with the 1st, the 2nd main transformer speed with reverse shift fork 161,162, they be fastened on above-mentioned the 1st, the 2nd main transformer speed with gearshift 155b, 156b is last and to the axial direction move operation, switch the transmission of power path thus.The 1st main transformer speed is fastened on the 1st main transformer speed with on the gearshift 155b with reverse shift fork 161, and the 2nd main transformer speed is fastened on the 2nd main transformer speed with on the gearshift 156b with reverse shift fork 162.

In addition, be provided with corresponding to this main transformer speed on lid 160 and dial 2 shift levels 164,165 of 161,162 with gear shift, they are used for supporting the 1st, the 2nd main transformer speed reverse shift fork 161,162.

A pair of supporting wall 167,168 and middle supporting wall 169 before and after the inner face upper side of lid 160 is provided with, this centre supporting wall 169 is set between the top of this front and back supporting wall 167,168.

Above-mentioned shift level 164,165 has the axis of fore-and-aft direction, support fast the 1st shift level 164 of the 1st main transformer to move freely twelve Earthly Branches and be held between the top of back supporting wall 168 and middle supporting wall 169, support fast the 2nd shift level 165 of the 2nd main transformer to move freely twelve Earthly Branches and be held in preceding supporting wall 167 and middle supporting wall 169 along fore-and-aft direction with reverse shift fork 162 along fore-and-aft direction with reverse shift fork 161.

The bottom of the 1st main transformer speed with reverse shift fork 161 is fixedly mounted on the 1st shift level 164, the bottom of the 2nd main transformer speed with reverse shift fork 162 is fixedly mounted on the 2nd shift level 165,1st, the 2nd main transformer speed, moves freely twelve Earthly Branches along fore-and-aft direction and is held in and covers 160 through the 1st shift level the 164, the 2nd shift level 165 with reverse shift fork 161,162.

On the bottom of the 1st shift level 164 and the 2nd main transformer speed, be respectively equipped with the engagement portion 170A, the 170B that constitute by groove etc. with reverse shift fork 162, this engagement portion 170A, 170B are being set up in parallel (engagement portion that is formed on the 1st shift level 164 is called the 1st engagement portion 170A, is arranged on the 2nd main transformer speed and is called the 2nd engagement portion 170B with the engagement portion on the bottom of reverse shift fork 162) on the left and right directions.

In addition, be provided with operating device 172 on lid 160, this operating device 172 is connected and is propping up on the main shift lever of the car body that is held in tractor in the mode of the operation that freely swings, and is used for operating the 1st, the 2nd main transformer speed reverse shift fork 161,162.

This operating device 172 has: service axis 173, operate with choosing one of them the reverse shift fork 161,162 wantonly from the 1st, the 2nd main transformer speed; Alternative pack 174 is fastened on this service axis 173, and this service axis 173 is moved to axial direction, so as from the 1st, the 2nd main transformer speed with the reverse shift fork 161,162 optional one of them; Rotatable parts 175 to move freely relatively at axial direction and one is installed on the service axis 173 freely to rotate, make this service axis 173 rotate, so that selected main transformer speed moves with reverse shift fork 161,162; Returnning spring 176 is used for making service axis 173 to get back to the reference position.

On the other hand, on lid 160, be provided with the support part 177 of the integrally formed direction to the left and right of standing shape foreign side, be formed with the supporting hole 178 that connects shape in this support part 177, this supporting hole 178 has the axis of left and right directions, interspersed service axis 173 in this supporting hole 178.

Service axis 173 has: distolateral large-diameter portion 173a in the left and right directions; The diameter that forms is less than the middle footpath 173b of portion of the left and right directions middle part of this large-diameter portion 173a; The diameter that forms is less than the outer distolateral minor diameter part 173c of the left and right directions of the 173b of footpath portion in this.

Above-mentioned large-diameter portion 173a moves freely twelve Earthly Branches at axial direction (left and right directions) and is held in the above-mentioned supporting hole 178, and in the left and right directions of large-diameter portion 173a, be provided with arm member 179 on distolateral, this arm member is outstanding in footpath direction foreign side's side and upper side, and the whole Zhou Fangxiang in distolateral upper edge is formed with engagement groove 180 outside the left and right directions of this large-diameter portion 173a.

The tip side of above-mentioned arm member 179 (upper end side, joint) 179a forms following structure, that is: be fastened on the 2nd main transformer speed with on the engagement portion 170B of reverse shift fork 162 at the place, reference position of service axis 173, from this reference position towards left and right directions foreign side side (the 1st mobile position) move operation axle 173, tip side 179a with arm member 179 is fastened on the engagement portion 170A of the 1st shift level 164 thus, thereby service axis 173 is moved towards left and right directions, with from the 1st, the 2nd main transformer speed with the reverse shift fork 161,162 optional one of them.

But also form following structure, that is: in the reference position or the 1st mobile position around axis (position, the left and right sides) rotating operation axle 173, make arm member 179 around the Y-axis swing thus, selected main transformer speed is moved forward and backward with reverse shift fork 161,162.

Be provided with accommodating part 182 on the position corresponding with above-mentioned engagement groove 180 of the front portion of above-mentioned support part 177, this accommodating part 182 is used for holding above-mentioned alternative pack 174.

Both be provided with accommodating chamber 183 in this accommodating part 182 and also be provided with rotatingshaft 184, when forming accommodating chamber 183, it is enclosed in connects the front side that this accommodating part 182 forms the hole of part on the fore-and-aft direction, and be communicated with the supporting hole 178 of support part 177, when rotatingshaft 184 is set, make it cross this accommodating chamber 183, supported freely to rotate around the axis of above-below direction at above-below direction.

In above-mentioned accommodating chamber 183, hold alternative pack 174, this alternative pack 174 forms following structure, that is: give prominence in footpath direction foreign side and rearward from above-mentioned rotatingshaft 184, its bottom end side is fixed in this rotatingshaft 184, and in supporting hole 178, insert the tip side 74a of this alternative pack 174 and fasten with engagement groove 180, around rotational rotatingshaft 184, alternative pack 174 is swung thus, thereby service axis 173 is moved up at right and left.

The lower end side of above-mentioned rotatingshaft 184 is 182 outstanding towards the below from the accommodating part, on part outstanding below this, fixing the 1st rod unit 185, it is standing shape on footpath direction foreign side and left and right directions foreign side side, be provided with the pin 186 that is used for connecting wire on the 1st rod unit 185.

Above-mentioned rotatable parts 175 form tubular, in the left and right directions of these rotatable parts 175 square side around Y-axis be inserted in freely to rotate the left and right directions of above-mentioned supporting hole 178 outer distolateral on, and the interior outer freely to rotate embedding of square side one (spline fitted) of the left and right directions of the interior perimembranous of these rotatable parts 175 is in the middle footpath 173b of portion of service axis 173.

The plate 187 of the outside of these rotatable parts 175 by being fixed by bolts to support part 177 prevents to break away from around the axis of left and right directions rotationally.

In addition, make the left and right directions foreign side side of the interior perimembranous of rotatable parts 175 become receiving bore 188, these receiving bore 188 formed diameters are greater than the spline part of interior side's side, the interior perimembranous of rotatable parts 175 forms and has stair-stepping hole, makes the minor diameter part 173c of service axis 173 outstanding in above-mentioned receiving bore 188.

On the minor diameter part 173c of this service axis 173, outside moving freely relatively, left and right directions (axial direction of service axis 173) is embedded with pairing left and right ring-spring support unit 189,190, these spring-loaded parts 189,190 are configured on the left and right directions relatively, and Returnning spring 176 is made of the compression shape helical spring that is positioned between these spring-loaded parts 89,90.

Abutting part (being referred to as outside abutting part) 191 can make the spring-loaded parts (being referred to as outside spring-loaded parts) 189 of left and right directions foreign side side not break away from from minor diameter part 173c, and this abutting part 191 is made of the stop ring on distolateral outside the left and right directions that is embedded in minor diameter part 173c.

In addition, limitation part (being called outside limitation part) 192 is embedded in the left and right directions foreign side side of outside spring-loaded parts 189, limitation part 192 is made of to the cylindrical shell that opposition side moves restriction outside spring-loaded parts 189, and anticreep parts 193 can prevent that this outside limitation part 192 is from receiving bore 188 direction foreign side side disengaging to the left and right.

In addition, the interior Zhou Jing of outside limitation part 192 is greater than the outside abutting part 191 on the minor diameter part 173c that is arranged on service axis 173, and minor diameter part 173c and outside abutting part 191 can relatively move at left and right directions in the side limitation part 192 outside.

Aforesaid operations axle 173 is on the reference position, as shown in figure 14, outside spring-loaded parts 189 are subjected to the active force of Returnning spring 176 and connect with outside limitation part 192 and outside abutting part 191, the spring-loaded parts (being referred to as inboard bearing part) 190 of square side are subjected to the active force of Returnning spring 176 and (this part is the abutting part 194 that is connected to inboard spring support unit 190 in the left and right directions exterior edge face of the 173b of footpath portion in being connected in the left and right directions, be referred to as inboard abutting part) and the end difference of the interior perimembranous of rotatable parts 175 (this part is the limitation part 195 of the inboard spring support unit 190 of restriction towards opposite direction one side shifting, be referred to as inboard limitation part) on, by the active force of Returnning spring 176 service axis 173 is remained on the reference position.

If for the tip portion 179a that makes arm member engages with the 1st engagement portion 170A, make service axis 173 from the reference position axle direction foreign side side shifting to the left and right, inboard spring support unit 190 is by inboard abutting part 194 pushings, thereby when compression reseting spring 176, direction foreign side side shifting to the left and right, make service axis 173 direction foreign side side shifting to the left and right thus, once from the steering force of this state releasing to service axis 173 left and right directions foreign side sides, then inboard spring support unit 190 is subjected to the active force of Returnning spring 176 and is urged, square side shifting in the direction to the left and right, service axis 173 will be returned to the reference position.

The 2nd rod member 196 radially outwards and rearward be fixed on highlightedly rotatable parts 175 on the outstanding part of support part 177.

In addition, outer distolateral with the left and right directions of lid 197 sealing receiving bores 188.

Above-mentioned the 1st rod member 185 is connected by selection wire and the main shift lever that is made of push-and-pull wire etc., the 2nd rod member 196 is connected with main shift lever by bindiny mechanism etc., main shift lever a direction and with the other direction of a described direction quadrature on the operation that freely swings, by swinging operation in a direction, by the 1st rod member 185, rotatingshaft 184 and alternative pack 174 service axis 173 is moved on the Y-axis direction, and by in the operation of other direction, service axis 173 is rotated around Y-axis by the 2nd rod member 196, rotatable parts 175.

In addition, the assembly 198 that the outer wire of above-mentioned selection wire is installed is fixed on and covers 160 outside.

As shown in Figure 5, secondary speed-changing device 142 is to be made of normal engagement type speed changing structure, and have: high gear is 201; Low speed gear train 202 is positioned at this high gear and is 201 rear; The outer freely to rotate embedding of splined projections 303, one (spline fitted) in the high gear of output shaft 146 be 201 and low speed gear train 202 between; Secondary speed change is with gearshift 204, axial direction move freely and one freely to rotate outside embedding (spline fitted) on this splined projections 303.

High gear is that 201 driving side gear is that the side gear 151b that is driven by the 3rd fast train of gearings 151 of speed change gear 141 constitutes, and both can realize the dual-purposeization of parts, also helps the compactness of speed change gear 111.

In addition, high gear is that 201 the side gear 201b that is driven rotates relatively freely extraterrestrial being embedded on the output shaft 146, at the front side that is driven side gear 201b of output shaft 146, is embedded in outward this is driven on the spacing body 181 that side gear 201b positions usefulness.

In addition, what the driving side gear 202a of low speed gear train 202 was integrally formed in the 2nd fast gear 150 on the jack shaft 145 is driven being driven between the side gear 151b of side gear 150b and the 3rd fast gear 151, is driven side gear 202b and rotates relatively freely extraterrestrial being embedded on the output shaft 146.

Thereby, put the space 140 that is used for appending 2 grades of train of gearings on 141 at above-mentioned main transformer quick-mounting and be in the corresponding position of driving side gear 202a with low speed gear train 202.

In addition, being driven of the driving side gear 202a of the low speed gear train 202 of jack shaft 145 and the 3rd train of gearings 151 forming the spline that is used for the gear tabling between the side gear 151b.

In addition, high gear is that 201 the rear portion side that is driven side gear 201b and the toe lateral that is driven side gear 202b of low speed gear 202 are provided with the engaging piece 205 that is meshed with secondary speed-change and gearshift device 204,206, secondary speed-change and gearshift device 204 not with this engaging piece 205,206 states that are meshed are non-dynamic regimes, secondary speed-change and gearshift device 204 is forwards slided along axial direction, making this pair speed-change and gearshift device 204 and splined projections 303 and high gear is that 201 the engaging piece that is driven side gear 201b 205 is meshed, and becoming by high gear thus is 201, the fast state of secondary speed-change and gearshift device 204 and splined projections 303 secondary speed-changing device 142 of the high-speed side power of the secondary speed change of 146 transmission from jack shaft 145 towards output shaft; From above-mentioned non-power transmission position secondary speed-change and gearshift device 204 is slided along the axial direction rear, this pair speed-change and gearshift device 204 is meshed with the engaging piece that is driven side gear 202b 206 of splined projections 303 and low speed gear train 202, become by low speed gear 202, secondary speed change gearshift 204, splined projections 303 lower-speed state of the secondary speed-changing device 142 of the low speed side power of the secondary speed change of 146 transmission thus from jack shaft 145 towards output shaft.

In addition, the engaging piece that is driven side gear 202b 206 of low speed gear train 202 makes secondary speed change be positioned at the position that breaks away from splined projections 303 with gearshift 204 than the axle direction length long (or roughly the same length) of secondary speed change with gearshift 204.The position that this pair speed-change and gearshift device 204 breaks away from splined projections 303 is neither to be in the position that fast state is not in lower-speed state yet, makes wriggling speed change gear 143 become the wriggling speed change switching position C of on-state as being used to.By make secondary speed change with gearshift 204 from the forward end position of this moving area towards the rear (to a side of axial direction) mobile, then can be in the high speed position H of fast state, low-speed position L that secondary speed-changing device 142 is in lower-speed state and speed change gear 142 neither fast state is not again that secondary speed change is freely shifted one's position with gearshift 204 between the wriggling speed change switching position C of lower-speed state at secondary speed-changing device 142.

In addition, secondary speed change can be remained on high speed position H, low-speed position L, wriggling speed change switching position C with gearshift 204 by detent mechanism.In addition, also can remain on neutral position between high speed position H and the low-speed position L.

The integrally formed wriggling output gear 207 at the rear portion of low speed gear train 202 towards wriggling speed change gear 143 outputting powers, at the final gear 208 of the rear of this wriggling output gear 207 configuration wriggling, this final gear 208 of wriggling is by the power of wriggling speed change gear 143 after output shaft 146 inputs are slowed down, and these final gear 208 one of wriggling are embedded on the output shaft 146 freely to rotate.

In addition, the final gear 208 of described wriggling being arranged on the main transformer quick-mounting puts between 141 the 1st fast train of gearings and the 2nd fast train of gearings.

In addition, if consider abrasion etc., then also above-mentioned the 1st main transformer speed switch clutch 155 can be arranged on jack shaft 145 sides slower than input shaft 144 rotating speeds usually, if be arranged on the jack shaft 145, then the moment of inertia can become big, it is big that the synchromesh amount also becomes, synchromesh amount in addition becomes with reduction speed ratio and becomes big greatly, the 1st main transformer speed switch clutch 155 becomes big along the footpath direction thus, put between 141 the 1st fast train of gearings 149 and the 2nd fast train of gearings 150 thereby the bigger final gear 208 of wriggling in gear footpath can not be configured in the main transformer quick-mounting, the main transformer quick-mounting can not be put 141, secondary speed-changing device 142 and wriggling speed change gear 143 are contained in a pair of wall portion 25 of transmission case 5, between 147.

In addition, the axle base between jack shaft 145 and output shaft 146 is because of the restriction that is subjected to other gear can not become big.

For this reason, in the present embodiment, be arranged on the input shaft 144 by the 1st the 1st main transformer speed switch clutch 155 fast and the 2nd speed that will switch main transformer speed, make the 1st main transformer speed clutch 155 become compact along the footpath direction, thereby the final gear 208 of wriggling that can gear is bigger is configured in the main transformer quick-mounting and puts between 141 the 1st fast train of gearings 149 and the 2nd fast train of gearings 150, with the main transformer quick-mounting put 141, secondary speed-changing device 142 and wriggling speed change gear 143 are contained in transmission case 5 between a pair of wall portion 25,147.

In addition, at the integrally formed front-wheel power output gear of the rear portion side of the final gear 208 of above-mentioned wriggling 209 driving side gear 209a, the side gear 209b that is driven of this front-wheel power output gear 209 rotates relatively freely extraterrestrial being embedded on the above-mentioned front-wheel cardan shaft 14, by be arranged on the slide of the clutch 210 on the described front-wheel cardan shaft 14 along fore-and-aft direction, can will be delivered to front-wheel through the power behind the speed change gear 11 with being free to slide with freely being communicated with/disconnecting.

The major part of above-mentioned wriggling speed change gear 143 is assemblied on the above-mentioned lid 160, be installed in clutch housing 1 by covering 160, wriggling speed change gear 143 freely can be engaged/is installed in discretely in the power-transmission system between secondary speed-changing device 142 and the trailing wheel differential motion 13, also can be assemblied in to cover at the speed change gear 143 of will wriggling having wriggling speed change form and the speed change gear 143 of will wriggle to be assemblied in the nothing of covering on 160 to wriggle between the speed change form, simply speed change gear 111 is carried out formal argument on 160.

As Fig. 5, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 15 and shown in Figure 16, this wriggling speed change gear 143 is except that the above-mentioned wriggling output gear 207 and the final gear 208 of wriggling, the transmission shaft 211,212 that also has pairing left and right, described transmission shaft 211,212 is arranged between the bottom of the front and back supporting arm 167,168 that covers 160 internal surfaces, axis around fore-and-aft direction is supported freely to rotate, (left and right directions foreign side side) transmission shaft 211 of one side is as the input side transmission shaft, and (the interior square side of left and right directions) transmission shaft 212 of the opposing party is as the outlet side transmission shaft.

In addition, wriggling speed change gear 143 comprises: the 1st wriggling speed change gear 213 rotates relatively freely and extraterrestrially is embedded in the middle part of outlet side transmission shaft 212 and is meshed with above-mentioned wriggling output gear 207; The 2nd the wriggling speed change gear 214, be integrally formed in the 1st the wriggling speed change gear 213 rear portion side; The 3rd wriggling speed change gear 215 both was meshed with the 2nd wriggling speed change gear 214, and another body is outer freely to rotate to be embedded on the input shaft side transmission shaft 211; The 4th wriggling speed change gear 216 is configured in the rear side of the 3rd wriggling speed change gear 215, and one is outer freely to rotate to be embedded on the input side transmission shaft 211; The 5th wriggling speed change gear 217 is meshed with the 4th wriggling speed change gear 216; Transmission cylinder 218 rotates relatively freely and extraterrestrially is embedded on the outlet side transmission shaft 212 and one is outer freely to rotate is embedded on the 5th wriggling speed change gear 217; The wriggling speed change is with transmission cylinder 218, moves freely and one is embedded in freely to rotate on this transmission cylinder 218 along axis; The 6th wriggling speed change gear 220 is configured in the rear side of above-mentioned the 2nd wriggling speed change gear 214, both is meshed with the final gear 208 of above-mentioned wriggling, and another body is outer freely to rotate to be embedded on the outlet side transmission shaft 212.

In addition, in the rear end side of wriggling speed change, will be arranged on outlet side transmission shaft 212 with the engaging piece 221 that gearshift 219 is meshed with the wriggling speed change with the moving area of the fore-and-aft direction of gearshift 219.

In the wriggling speed change gear 143 of said structure, when the wriggling speed change is meshed with engaging piece 221 with gearshift 219, then become the on-state (wriggling speed change state) of wriggling speed change gear 143, in described on-state, power from jack shaft 145 through low speed gear trains 202 → wriggling output gear 207 → the 1st wriggling speed change gears 213 → 2 wriggling speed change gears 214 → 3 wriggling speed change gears, 215 → input side transmission shaft, 211 → the 4th wriggling speed change gears 216 → 5 wriggling speed change gears, 217 → transmission cylinder, 218 → wriggling speed change with the final gear 208 of gearshift 219 → engaging piece 211 → outlet side transmission shaft 212 → the 6th wriggling speed change gear 220 → wrigglings, and be delivered to output shaft 146 with the Ultra-Low Speed deceleration.If the wriggling speed change is thrown off with the engagement of gearshift 219 and engaging piece 221, then becomes power is not delivered to the wriggling speed change gear 143 of outlet side transmission shaft 212 from input side transmission shaft 211 off state.

Be used to move forward and backward secondary speed change with the secondary speed change of gearshift 204 with reverse shift fork 222 be used to move forward and backward the wriggling speed change and all be assemblied in above-mentioned lid 160 with reverse shift fork 223 with the wriggling speed change of gearshift 219, in addition, the speed change of wriggling is integrally formed in secondary speed change with on the reverse shift fork 222 with reverse shift fork 223, can be with a secondary speed change lever (operating stem) at equidirectional while sliding pair speed change reverse shift fork 222 and wriggling speed change reverse shift fork 223.

The 4th shift level 224 is arranged on the front and back supporting wall 168 set on the above-mentioned lid 160 along the axial direction of fore-and-aft direction with moving freely, secondary speed change is installed on the 4th shift level 224 with the bottom of reverse shift fork 223 with the reverse shift fork 222 and the speed change of wriggling, by this shift level 224 is moved towards axial direction, make secondary speed change move freely with reverse shift fork 223 fore-and-aft directions, thereby secondary speed change is moved to a direction with gearshift 219 with gearshift 204 and wriggling speed change simultaneously with reverse shift fork 222 and wriggling speed change.

In addition, secondary speed change separately forms with gearshift 219 with gearshift 204 and wriggling speed change, by being installed on the same reverse shift fork, secondary speed change is moved with gearshift 219 one with gearshift 204 and wriggling speed change.

In addition, when secondary speed change is positioned on high speed position H and the low-speed position L with gearshift 204, form the state that above-mentioned wriggling speed change is thrown off with the engagement of gearshift 219 and engaging piece 221, when secondary speed change was positioned at wriggling speed change COMM communication C with gearshift 204, above-mentioned wriggling speed change can be meshed with engaging piece 221 with gearshift 219.

Thereby, secondary speed change lever of straight line swinging operation on a direction, switch the switching successively of the lower-speed state → wriggling speed change state of the fast state → secondary speed change of formation secondary speed-changing device 142 at high speed position H, low-speed position L, wriggling position C with gearshift 204 by making secondary speed change.

On the other hand, rear and low part at lid 160 is provided with the support part 229 with inserting hole 228, this support part 229 has the axis of left and right directions and forms the opening shape in the axial direction both end sides, rotatingshaft 230 interts in the inserting hole 228 of this support part 229, and this rotatingshaft 230 can be supported freely to rotate around the axis of left and right directions.

The anticreep plate 231 of the outside by being fixed by bolts to support part 229 can prevent that described rotatingshaft 230 from outwards deviating from along left and right directions.

The interior distolateral of described rotatingshaft 230 given prominence in clutch housing 1 from covering 160, be provided with the outside and side-prominent upward arm member 232 of footpath direction this rotatingshaft 230 interior distolateral, the tip side of this arm member 232 (upper end side) 232a be arranged on secondary speed change and fasten with the engagement groove 236 of the bottom 233 of reverse shift fork 223 with the reverse shift fork 222 and the speed change of wriggling.

In addition, the left and right directions of this rotatingshaft 230 is outer distolateral outstanding from support part 229, and cartridge 234 outer being embedded on this projection and with pin are fixed, and is provided with the footpath direction outwards and outstanding rearward rod member 235 on this cartridge 234.

The rear end side of this rod member 235 is connected by linking mechanism and secondary speed change lever.

Thereby by secondary speed change lever is carried out swinging operation, rod member 235 swings up and down, and rotatingshaft 230 rotates and arm member 232 swings, thereby by the 4th shift level 224 secondary speed change is moved forward and backward with reverse shift fork 223 with reverse shift fork 222 and wriggling speed change.

The main transformer quick-mounting that Figure 17～Figure 20 shows above-mentioned mode of execution is put 141 the mode of executions of power transmitting deice when being 6 grades of speed changing types.

Put in 141 at illustrated main transformer quick-mounting, with the 5th fast train of gearings the 154, the 6th fast train of gearings 152 with they are carried out the 3rd main transformer speed switch clutch 157 that speed change switches be assembled to space 140.

In addition, in the present embodiment, begin to dispose successively the 4th fast train of gearings the 151, the 3rd fast train of gearings the 150, the 6th fast train of gearings the 152, the 5th fast train of gearings the 154, the 2nd fast train of gearings the 153, the 1st fast train of gearings 149 in the past, and append at the main transformer quick-mounting of above-mentioned 4 grades of speed change forms and put the 1st fast train of gearings 149 and the train of gearings of the gear ratio between the 2nd fast train of gearings 150 and the train of gearings of the gear ratio between the 3rd fast train of gearings 150 and the 4th fast train of gearings 151 in 141, put 141 as the main transformer quick-mounting of 6 grades of speed changing types thus.

Thereby, the main transformer quick-mounting of 6 grades of speed changing types of expression is put in 141 among Figure 17～Figure 20, the 1st fast train of gearings 149 is identical with the 1st fast train of gearings 149 gear ratio of 4 grades of speed changing types, the 2nd fast train of gearings 153 is the 1st fast train of gearings 149 of 4 grades of speed changing types and the gear ratio between the 2nd fast train of gearings 150, the 3rd train of gearings 150 is identical with the 2nd fast train of gearings 150 gear ratio of 4 grades of speed changing types, the 4th fast train of gearings 151 is identical with the 3rd fast train of gearings 151 gear ratio of 4 grades of speed changing types, the 5th fast train of gearings 154 is the 3rd fast train of gearings 151 of 4 grades of speed changing types and the gear ratio between the 4th fast train of gearings 152, and the 6th fast train of gearings 152 is identical with the 4th fast train of gearings 152 gear ratio of 4 grades of speed changing types.

In addition, the main transformer quick-mounting of these 6 grades of speed changing types is put 141 the 2nd fast train of gearings 153 and be driven side gear 153b, the 154b of the 5th fast train of gearings 154 is made of 2 integrally formed gears, thereby realizes the dual-purpose with the mate of jack shaft 145.

In addition, in the speed change gear 111 of this mode of execution, the high gear that is driven side gear 151b and becomes secondary speed-changing device 142 of the 4th fast train of gearings 151 is 201 driving side gear 151b, this high gear is 201 the rear portion formation tubular that is driven side gear 201b, is provided with the engaging piece 205 of secondary speed change usefulness gearshift 204 in the rear end side of this one.

In addition, on above-mentioned lid 160, be provided with the 3rd main transformer speed reverse shift fork 163, the 3rd main transformer speed engages with gearshift (being referred to as the 3rd main transformer speed gearshift) 157b with the main transformer speed of the 3rd main transformer speed switch clutch 157 with reverse shift fork 163, along the axial direction move operation it, thus power transfer path is switched to the 5th speed or the 6th speed, and on above-mentioned lid 160, also being provided with shift level 166 (being called the 3rd shift level 166), this shift level 166 is supported described the 3rd main transformer speed reverse shift fork 163.The 3rd main transformer speed is fixedly mounted on the 3rd shift level 166 with the bottom of reverse shift fork 163, the 3rd shift level 166 has the axis of fore-and-aft direction, and the interior square side of the left and right directions that is configured in above-mentioned the 1st shift level 164, move freely twelve Earthly Branches along fore-and-aft direction and be held on back supporting wall 168 and the middle supporting wall 169.

Be provided with the engagement portion 170C (the 3rd engagement portion) that is made of groove etc. on the 3rd shift level 166, the engagement portion 170A～170C with the 1st～3 is set up in parallel along left and right directions, makes the 2nd engagement portion 170B between the 1st engagement portion 170A and the 3rd engagement portion 170C.

In the present embodiment, place, reference position at service axis 173, the tip side 179a of above-mentioned arm member 179 and the 2nd engagement portion 170B fasten, (the 1st mobile position) move operation axle 173 from this reference position towards left and right directions, the tip side 179a of arm member 179 engages with the 1st engagement portion 170A thus, square side in from the reference position towards left and right directions (the 2nd mobile position) move operation axle 173, the tip side 179a of arm member 179 engages with the 3rd engagement portion 170C thus, service axis 173 is moved towards left and right directions, select some with in the reverse shift fork 161～163 of the 1st～3 main transformer speed thus.

Around axis (around Y-axis) rotating operation axle 173, arm member 179 can be around the Y-axis swing on reference position, the 1st mobile position or the 2nd mobile position, and selected main transformer speed moves forward and backward with reverse shift fork 161～163.

In addition, for the tip portion 179a that makes arm member 179 engages with the 1st engagement portion 170A from the reference position during along Y-axis direction foreign side side shifting service axis 173, inboard spring support unit 190 by inboard abutting part 194 pushings and on one side compression reseting spring 176 on one side towards left and right directions foreign side side shifting, allow service axis 173 towards left and right directions foreign side side shifting thus, if from this state remove for service axis 173 apply towards the steering force of left and right directions foreign side side the time, then inboard spring support unit 190 be subjected to Returnning spring 176 active force pushing and in the left and right directions square side shifting, make service axis 173 turn back to the reference position.

In addition, make for the tip portion 179a that makes arm member 179 engages with the 3rd engagement portion 170C service axis 173 from the reference position in the Y-axis direction during square side shifting, outside spring-loaded parts 189 are compression reseting spring 176 square side shifting in the Y-axis direction on one side by 191 pushings of outside abutting part and on one side, allow service axis 173 square side shifting in the left and right directions thus, when removing the steering force of square side in left and right directions that service axis 173 is applied from this state, outside spring-loaded parts 189 are subjected to the active force of Returnning spring 176 and are urged, so, make service axis 173 turn back to the reference position towards left and right directions foreign side side shifting.

Thereby, can make the reference position that can turn back to the centre of above-mentioned three positions by a Returnning spring 176 at the service axis 173 of three free conversion in position of Y-axis direction.

Other structure is identical with the structure of the mode of execution shown in above-mentioned Fig. 5～Figure 16.

Figure 21 relates to other mode of execution, assembles thereby easily the main transformer quick-mounting is put 141 driving side gear, the 1st, 2 main transformers speed switch clutch 155,156.

The driving side train of gearings 149a of the driving side gear 150a of the 2nd fast gear 150 among the figure, the 1st main transformer speed switch clutch the 155, the 1st fast train of gearings 149 is embedded in input shaft 144 from rear end side outside successively according to this order, the front end of driving side gear 150a by being installed in 237 pairs the 2nd fast train of gearings 150 of retainer ring on the input shaft 144 positions, to adjust the front side that the axle collar 239 is placed on the retainer ring 238 that the rear end to the driving side gear 149a of the 1st fast train of gearings 149 positions, thereby can eliminate loosening.

On the other hand, the driving side gear 151a of the 3rd fast train of gearings 151, the 2nd main transformer speed switch clutch 156, the driving side gear 152a of the 4th fast train of gearings 152, bearing 240 is embedded in input shaft 144 outward successively according to this order and assembles, the rear end of driving side gear 151a by being installed in 241 pairs the 3rd fast train of gearings 151 of retainer ring on the input shaft 144 positions, as the driving side gear 151a that has assembled the 3rd fast train of gearings 151, the 2nd main transformer speed switch clutch 156, the driving side gear 152a of the 4th fast train of gearings 152, after the bearing 240, from the rear forward end of input shaft 144 inserted and to lead to the supporting hole 242 of the bearing 240 on being formed on partition 25, insert logical back and will import from the front end of input shaft 144 and be embedded in outside the gear 132 on this input shaft 144, will be connected to the front end that anticreep plate 243 on the forward end of input shaft 132 is fixed on input shaft 144 with bolt 244.

This anticreep plate 244 is formed by sheet materials such as spring nets, and fastening above-mentioned bolt 244 pushes input gear 132 in the wings with this anticreep plate 244, can eliminate loosening thus.

In this embodiment, also replaceable input shaft 144 when becoming 6 grades of speed changing types.

In addition, the present invention is not limited to above-mentioned mode of execution, can also put at the main transformer quick-mounting of a plurality of speed change levels and append one or more speed change levels in 141.

Below clutch mechanism 18 and inertia braking mechanism 319 are described.

PTO live axle 16 is delivered to PTO transmission shaft 17 with engine power by clutch mechanism 18, and this PTO transmission shaft 17 arrives transmission of power by PTO gear 19 the PTO axle 6 at the rear portion of gearbox 3.PTO live axle 16 is configured on the same axis by relative in gearbox 3 with PTO transmission shaft 17, they in gearbox 3 by bearing by separate and support rotationally.

As shown in figure 22, clutch mechanism 18 comprises: disc type fixing body 312 is connected on the PTO live axle 16; Clutch body 313 is connected on the PTO transmission shaft 17; Clutch plunger 317, be intercalated in slidably in the cylinder chamber 314 of clutch body 313, by supplying to the oil pressure in this cylinder chamber 314, with the clutch plate 315 of the above-mentioned disc type fixing body 312 of crimping and the driving plate 316 of above-mentioned clutch body 313, become the clutch coupled condition towards clutch connecting direction forward motion; Clutch spring 318 makes above-mentioned clutch plunger 317 cut off the direction backward movement towards clutch by getting rid of above-mentioned oil pressure, thereby removes the crimping of clutch plate 315 and driving plate 316, becomes clutch and cuts off state.

On this clutch mechanism 18 inertia braking mechanism 319 is set, when cutting off clutch, the inertia of braking PTO transmission shaft 17 by clutch body 313 rotates.Described inertia braking mechanism 319 comprises: brake disc 320 fixedly remains in gearbox 3; Be braked plate 321, but unitary rotation be installed on the clutch body 313, and can be toward or away from above-mentioned clutch disk 320.Disc type fixing body 312 is cup-shaped, lug boss 312a is formed on the bottom at this cup-shaped, this lug boss 312a spline is embedded on the spline shaft 16a on the rearward end outer circumferential face that is formed on PTO live axle 16, by being fixedly mounted on the stop ring 16b on this spline shaft 16a, on axle direction, position.On the open end side outer circumferential face entire circumference of the ring-type of disc type fixing body 312, along axle direction in accordance with regulations length form concavo-convex rib, be formed with the concavo-convex rib that combines with this concavo-convex rib on the inner peripheral surface of many clutch plate 315, described clutch plate 315 is removable on axle direction, with the mode of disc type fixing body 312 unitary rotation by chimeric.

Clutch body 313 is diameter cup-like shape greater than disc type fixing body 312, in the bottom of this annular shape, extends to form lug boss 313a towards the axle direction rear end side, and extends to form protheca 313b towards the axle direction forward end.Lug boss 313a and protheca 313b spline are embedded on the spline shaft 17a on the axle direction forward end outer circumferential face that is formed on PTO transmission shaft 17.The outer circumferential face of lug boss 313a props up freely to rotate by bearing 327 and is held on the feed flow ring 326, and 326 fixing on this feed flow ring is held on the support rack 328 of gearbox 3.

Be formed with path axis hole 16c at the rear end of above-mentioned PTO live axle 16 central part, insert the path axial region 17b of the front end central part of PTO transmission shaft 17 freely to rotate in this path axis hole 16c, coaxial thus wire twelve Earthly Branches are held PTO live axle 16 and PTO transmission shaft 17.Clutch body 313 and above-mentioned disc type fixing body 312 are faced the opening portion side of mutual cup-like shape mutually, thereby cover the latter by the ground combination of coaxial wire with the former.The protheca 313b of clutch body 313 extends setting in the cup-like shape of disc type fixing body 312, the top of this protheca 313b is supported in the tubular shape portion of disc type fixing body 312 rotationally by bearing 329.

The cup-like shape portion of clutch body 313 forms like this, that is: the 313c of path inner peripheral surface is a bottom side, and big footpath inner peripheral surface 313d is the opening portion side.On the open end side inner peripheral surface entire circumference of the big footpath inner peripheral surface 313d of clutch body 313, form concavo-convex rib with specific length along axle direction, be formed with the concavo-convex rib that fastens with this concavo-convex rib on the outer circumferential face of many driving plates 316, described driving plate 316 is removable on axle direction, in the mode of rotating with clutch body 313 one by chimeric.Above-mentioned many clutches 315 and many driving plates 316 are along the axial direction alternate configurations.

Pressing plate 322 is entrenched in the opening portion side end of the big footpath inner peripheral surface 313d of clutch body 313, this pressing plate 322 is by stop ring 323a and cup spring 323b, similarly can on axle direction, move with driving plate 316 by engaging of concavo-convex rib and with clutch body 313 unitary rotation.On the ladder surface 313e of the boundary portion of the big footpath inner peripheral surface 313d of clutch body 313 and path inner peripheral surface 313c, axially run through the pin supporting hole 325 of formation as the support part of pin 324.A plurality of pin supporting holes 325 (in the diagram being three), axially equal intervals ground forms.

On clutch plunger 317, be formed with path inner peripheral surface 313c and corresponding path outer circumferential face 317a and the big footpath outer circumferential face 317b of big footpath inner peripheral surface 313d with above-mentioned clutch body 313.In addition, the inner peripheral surface 317c intercalation slidably of clutch plunger 317 is on the protheca 313b of clutch body 313.The annular seal 317d of the airtight O shape ring of the maintenance corresponding with the path inner peripheral surface 313d of clutch body 313 etc. is installed on the part of the path outer circumferential face 317a of clutch plunger 317, and the annular seal 317f of the airtight O shape ring of the maintenance corresponding with the inner peripheral surface 317c of clutch plunger 317 etc. is installed on the part of the outer circumferential face of protheca 313b.

By this structure, make the cylinder chamber 314 maintenance tightness of intercalation clutch plunger 317 slidably, prevent leak of liquid.By the lug boss 313g that is formed on the supply opening 326a on the feed flow ring 326 and is formed on clutch body 313, oil pressure is supplied with and imported in this cylinder chamber 314.Pump outside scheming carries out towards the cylinder chamber supply and the eliminating of the oil pressure in 314 by control valve.Clutch spring 318 adopts the pressure spring of spiral motion shapes, makes between the end face of near the top that is installed in above-mentioned protheca 313b in the annular shape portion that is located at disc type fixing body 312 after clutch spring 318 compressions spring seat 330 and clutch plunger 317.

The brake disc 320 of inertia braking mechanism 319 adopts discoid plate, its peripheral part fixedly remains on the part of gearbox 3, and the axle direction end face butt of interior perimembranous also props up the axle direction front end that is held in the feed flow ring 326 that fixedly is supported on the support rack 328, and the trip of concentric shape ground is embedded in the outer circumferential face of the lug boss 313a of clutch body 313.Shown in Figure 22,23, be braked plate 321 and adopt the discoid plate same with above-mentioned brake disc 320, at its outer circumferential face upper edge Zhou Fangxiang equally spaced to be formed with concavo-convex pawl 321a.In addition, on the outside, bottom side axle direction end of the cup-like shape of above-mentioned clutch body 313, equally spaced to be formed with concavo-convex pawl 313h, this concavo-convex pawl 313h is corresponding with the above-mentioned concavo-convex pawl 321a that is braked plate 321 along Zhou Fangxiang.The above-mentioned concavo-convex pawl 321a that is braked plate 321 and the concavo-convex pawl 313h of clutch plate 313 are fastened, be braked plate 321 thus and on same axis, axially can move, rotate with clutch body 313 with respect to clutch plate 313 with clutch body 313.By this structure, be braked plate 321 with respect to clutch body 313, can approach brake disc 320 and be separated from each other, and engage with clutch body 313 unitary rotation ground.

Above-mentioned brake disc 320 and be braked the side of surface of contact of plate 321 or two sides on brake lining is installed.Pin 324 and clutch plunger 317 and to be braked plate 321 all be disconnected and when cutting off clutch, with clutch plunger 317 be braked plate 321 and connect, by clutch plunger 317 spring force of clutch spring 318 is delivered to and is braked plate 321, for this is suppressed on brake disc 320 by check plate 321, then be free to slide the pin supporting hole 325 that twelve Earthly Branches are held in above-mentioned clutch body 313.

This pin 324 imports and supplies to cylinder chamber 314 with oil pressure, clutch plunger 317 moves up the clutch connecting part, thus, owing between the bearing surface of this pin 324 and clutch plunger 317, form axial gap, so utilizing the spring force of clutch spring 318 liberates by check plate 321, thereby possesses the function of suppressing that releasing applies for brake disc 320, the function that promptly has the braking force of removing PTO transmission shaft 17, so axial length for pin supporting hole 325, make pin 324 be longer than the length of pin supporting hole 325, when cutting off clutch operating, pin 324 is compared with pin supporting hole 325 will be towards being given prominence to by check plate 321, thereby can will be suppressed on brake disc 320 by check plate 321.Consider for the axle direction displacement distance of the brake body 320 that is braked plate 321 and set, as identical with the above-mentioned axle direction displacement distance degree that is braked plate 321 from the overhang of the pin supporting hole 325 of above-mentioned pin 324.

The supporting location of above-mentioned pin 324, promptly the formation position towards the clutch body 313 of above-mentioned pin supporting hole 325 is the position in the direction outside, footpath of above-mentioned cylinder chamber 314, becomes and the corresponding position of the peripheral part of clutch plunger 317.This position becomes path outer circumferential face 317a and the big directly corresponding position of interface (the large-diameter portion end face of clutch plunger 317) of outer circumferential face 317b with clutch plunger 317.In addition, the supporting location of pin 324 becomes and the corresponding position of protuberance that is braked the concavo-convex pawl 321a of plate 321.Neither can make the external diameter of clutch body 313 become big thus, the internal diameter of cylinder chamber 314 is diminished, thereby can add the footpath direction wall thickness between vat chamber 314 and the pin supporting hole 325.

The hydraulic type PTO clutch that has inertia braking mechanism of the present invention that constitutes by said structure, do not supplying with under the state of oil pressure to cylinder chamber 314, spring force by clutch spring 318, clutch plunger 317 is pushed to the bottom side of the cup-like shape of clutch body 313, remove the crimping of clutch plate 315 and driving plate 316, thereby keep the clutch dissengaged positions.Under this state, be braked the spring force of plate 321 by clutch spring 318, by clutch plunger 317 and sell 324 by being suppressed, thereby keep braking state towards brake disc 320.Thereby power can not be passed to the transmission shaft 17 of PTO.

When oil pressure is supplied with in above-mentioned cylinder chamber 314, clutch plunger 317 can opposing clutch springs 318 spring force and towards the open end side pushing of the cup-like shape of clutch body 313 and drive, towards pressing plate 322 crimping clutch plate 315 and driving plate 316, thereby become the clutch coupled condition.Under this state, be braked plate 321 by from clutch plunger 317 and sell 324 suppress and liberated, thus isolated rotatable with brake disc.Thereby, the transmission of power from PTO live axle 16 can be arrived PTO transmission shaft 17.When getting rid of the oil pressure of cylinder chamber 314, spring force by clutch spring 318, towards the bottom side pushing of the annular shape of clutch body 313 and drive clutch plunger 317, remove the crimping of clutch plate 315 and driving plate 316 and become the clutch dissengaged positions, be braked plate 321 by clutch plunger 317 and sell 324 by being suppressed towards brake disc 320, thereby the transmission shaft 17 through being braked plate 321 and 313 couples of PTO of clutch body applies braking, thereby the inertia that can brake the transmission shaft 17 of PTO rotates.

The situation that above-mentioned mode of execution is represented is to make the hydraulic type PTO clutch that has inertia braking mechanism of the present invention be applicable to the speed changer of the driving system of tractor, but the present invention also is applicable between the drive-side shaft and passive side shaft that is configured in relatively on the same axis, the general clutch that transmission of torque is cut off.Next the bearing structure to the PTO gear 19 of the speed changer of the driving system that is applicable to above-mentioned tractor describes.As shown in figure 24, for from PTO transmission shaft 17 speed changes and output to PTO axle 6, then along diaxon under driving gear 331,332 intermeshing states, thereby above-mentioned PTO gear 19 is arranged on the end cover 4 of the rearward end of gearbox 3.

In the prior art, one side's driving gear 331 is integrally formed with minor axis (omitting diagram), the rear end of the front end of this minor axis and the transmission shaft of PTO 17 couples together with cup-like shape shaft coupling (omitting diagram), and above-mentioned minor axis is in the both sides of driving gear 331, props up with arm structure to be held on the end cover 4.In addition, the opposing party's driving gear 332 also props up with arm structure and is held on the end cover 4 in the prior art.For this reason, in the prior art, end cover 4 forms the double-walled structure, and this double-walled structure is installed parastate is formed on the both sides of driving gear 331,332 supporting wall (omitting diagram).The bearing structure complexity that causes the gear 19 of PTO of the prior art thus, components number also become many, thereby become the factor that cost reduces that hinders.

In order to improve above-mentioned point, as shown in figure 24, the present invention adopts following structure, promptly driving gear 331,332 all with the single armed structural support in end cover 4, make this end cover 4 become the structure of facing the wall and meditating.In addition, driving gear 331 replaces existing minor axis and forms spline axis hole 331a at central part, the spline shaft 17c of the rear end of PTO transmission shaft 17 is intercalated in this spline axis hole 331a, with respect to end cover 4, with 1 bearing 336 with single armed support rear end side.In addition, PTO axle 6 makes 2 places that isolate on axle direction prop up the bearing housing 4a of the central part that is held in end cover 4 freely to rotate by bearing 337,338.Bearing housing 4a is formed on end cover 4 highlightedly inside and outside axle direction.With tightening nut 33 driving gear 332 is fixedly mounted on the inner end of PTO axle 6, the inner end of this PTO axle 6 is by bearing 337,338, connects along the inward-outward direction of end cover 4 and is held in bearing housing 4a.By said structure, driving gear 332 from bearing housing 4a on interior side-prominent position, with the bearing housing 4a of single armed structural support in end cover 4.In addition, be formed with supply opening 4b obliquely, lid to be opened/closed is installed on the top of end cover 4.

Thus, make the driving gear 331 direct splines of PTO gear 19 be embedded in the rear end of PTO transmission shaft 17, omit the minor axis of this driving gear 331, and 331,332 of driving gears are held on the end cover 4 with the single armed structure, can make end cover 4 become a wall construction thus, owing to can realize the reduction of components number, thereby simplification and the cost of realizing the bearing structure of PTO gear 19 reduce.Below, drive hydraulic pressure supply mechanism as the power steering gear that is arranged on tractor with 3 connecting rod bindiny mechanisms on hydraulic pressure supply mechanism and the tractor rear portion, describe for the pump power export structure that is installed on the gearbox 3 with hydraulic pressure supply mechanisms etc.

In the prior art, use 3 straight-tooth gears (omitting diagram) to export pump power from the PTO cardan shaft of frequent rotation.In the prior art promptly, pump output shaft (not omitting diagram) is parallel with the PTO cardan shaft, disposes jack shaft (omitting diagram) between diaxon, respectively spur gear is installed on these 3 axles, thus driven pump.At this moment, be installed in gear and the gear that is installed on the jack shaft on the pump input shaft, all be installed in freely to rotate and installed with casing (omitting diagram), in this side that side who uses casing is installed pump main body (omitting diagram) is installed, thereby will be installed on the side of gearbox with the side of this side quadrature.

For this reason, not only components number is many for existing pump power output mechanism, and complex structure, thereby becomes the factor that cost reduces that hinders.So as shown in figure 25, the present invention from a pair of umbrella gear 341,342 outputting powers of PTO live axle 16 usefulness with rotating drive pump input shaft 443.At this moment, near the support rack 345 of gearbox 3 and being provided with position between of clutch mechanism 18 of the pump power outgoing position rear end of supporting PTO live axle 16 by bearing 344 freely to rotate.

One side's umbrella gear 341 has the lug boss 341a of the short tube axle shape of side extension axially, this lug boss 341a spline is embedded at the spline shaft 16a that is formed on the rear end outer circumferential face of PTO live axle 16, supports the support tube portion 345 of gearbox 3 freely to rotate and carry out axial location by the stop ring 346 that embeds in the PTO live axle by bearing 344.The opposing party's bevel gear 342 makes the lug boss 342a of the tube axle shape that extends on an axial side become the quill shaft structure, this lug boss 342a is at 2 places that isolate along axle direction, propped up freely to rotate to be held in by bearing 347,348 and installed, carried out axial location with positioning ring 350,351 with casing 349.End inner peripheral surface at above-mentioned lug boss 342a is formed with spline 342b, and pump input shaft 343 splines are embedded in this spline 342b.

Above-mentioned installation has with casing 349: cylindrical portion 349a; The outside mounting flange 349b of portion extends to form an end peripheral part at this cylindrical portion 349a along the footpath direction; Pump assembly department 349c, be embedded in the interior perimembranous of an end of above-mentioned cylindrical portion 349a, the mounting flange portion 353 of construction bolt mounted pump main body P on pump assembly department 349c, construction bolt is fixed on the outside mounting flange 349b of portion on the installation mating face (omitting diagram) of the side of gearbox 3.In addition, on the installation mating face of gearbox 3 (omitting diagram), be formed with the opening portion that is used for inserting cylindrical portion 349a.

At this moment, pump input shaft 343, is installed on the side of gearbox 3 under quadrature with respect to the PTO live axle.Because the components number that can cut down the pump power export structure by said structure, but also simplified structure, so can reduce cost.Figure 26 represents other mode of executions of pump power export structure, omits and installs with case 349, the mounting flange portion 353 of pump main body P is directly installed on the installation mating face 354 of the side of gearbox 3.At this moment, the installation mating face of the side of gearbox 3 354 on integrally formed cylindrical portion 355, this cylindrical portion 355 is supported the bevel gear 342 that is connected with pump input shaft 343 bevel gear 342 to be assembled on this cylindrical portion 355 freely to rotate by bearing 347,348 freely to rotate.In addition, other structure is identical with Figure 25.

By said structure, can further simplify the pump power export structure, also can cut down components number, realize the reduction of cost.

Claims (8)

1. speed changer that is used for tractor comprises:

Speed change gear (11) when motor that connects above-mentioned tractor and speed changer, is delivered to driving wheel after making the power speed changing from above-mentioned motor;

Cardan shaft (10) when motor that connects above-mentioned tractor and speed changer, transmits the power from above-mentioned motor;

The COMM communication that seesaws (12), when motor that connects above-mentioned tractor and speed changer, be configured between above-mentioned motor and the above-mentioned speed change gear (11), switching is from the sense of rotation of the driving force of above-mentioned motor, this COMM communication that seesaws (12) can be when advancing high speed position and low-speed position and going-back position between displacement

It is characterized in that the above-mentioned COMM communication that seesaws (12) comprising:

The high-speed clutch (27) that advances is installed on the above-mentioned cardan shaft, and the above-mentioned COMM communication that seesaws is switched on the above-mentioned high speed position of advancing;

The low-speed clutch (31) that advances is installed on the above-mentioned cardan shaft, and the above-mentioned COMM communication that seesaws is switched on the above-mentioned low-speed position;

Back clutch (29) is installed on the above-mentioned cardan shaft, and the above-mentioned COMM communication that seesaws is switched on the above-mentioned going-back position;

The 1st input gear (26b);

The 2nd input gear (30b);

The high speed of advancing output gear (26a) is meshed with above-mentioned the 1st input gear (26b) and by the high-speed clutch that advances (27) transmission onward impulse, the high speed transmission of power of will advancing thus is to speed change gear (11);

The low speed output gear (30a) that advances is meshed with above-mentioned the 2nd input gear (30b) and transmits onward impulse by the low-speed clutch that advances (31), and the low speed transmission of power of will advancing thus is to speed change gear (11);

Retreat driving gear (28d), be meshed with a side of above-mentioned the 1st input gear (26b) and the 2nd input gear (30b) and retreat power, will retreat transmission of power thus and arrive above-mentioned speed change gear (11) by back clutch (29) transmission.

2. the speed changer that is used for tractor as claimed in claim 1 is characterized in that, also comprises:

Retreat transmission shaft (28b), be configured in the below of above-mentioned cardan shaft (10) with paralleling with above-mentioned cardan shaft (10);

Input shaft (32), support above-mentioned the 1st input gear (26b) and the 2nd input gear (30b) rotationally, power is input to speed change gear (11), is configured in above-mentioned cardan shaft (10) with cardan shaft (10) with paralleling and retreats the side of the position between the transmission shaft (28b).

3. the speed changer that is used for tractor as claimed in claim 1 or 2 is characterized in that, the above-mentioned high speed output gear (26a) that advances, the above-mentioned low speed output gear (30a) and retreat output gear (28a) and prop up rotationally and be held on the above-mentioned cardan shaft (10) of advancing.

4. the speed changer that is used for tractor as claimed in claim 3, it is characterized in that, retreating on the transmission shaft (28b), supporting rotationally to have with above-mentioned to retreat that output gear (28a) is meshed and the counter gear (28c) of conversion sense of rotation and the above-mentioned driving gear (28d) that retreats.

5. the speed changer that is used for tractor as claimed in claim 1 or 2 is characterized in that, also comprises:

Shuttle valve (42) is used for pressure oil is selectively supplied to a certain side in the above-mentioned high-speed clutch that advances (27) and above-mentioned low-speed clutch that advances (31) and the above-mentioned back clutch (29);

High low speed switching valve (44), be arranged between above-mentioned shuttle valve (42) and the above-mentioned high-speed clutch that advances (27) and the above-mentioned low-speed clutch that advances (31), be used for pressure oil is selectively supplied to a certain side in above-mentioned high-speed clutch that advances (27) and the low-speed clutch that advances (31).

6. the speed changer that is used for tractor as claimed in claim 1 or 2, it is characterized in that, above-mentioned speed change gear (11) is arranged on along front and back and keeps between a pair of wall at interval, and above-mentioned speed change gear (11) comprising: the main transformer quick-mounting is put (141) and secondary speed-changing device (142).

7. the speed changer that is used for tractor as claimed in claim 6 is characterized in that, above-mentioned speed change gear (11) also comprises removable wriggling speed change gear (143).

8. the speed changer that is used for tractor as claimed in claim 1 or 2, it is characterized in that, has the 1st wall of supporting it in the place ahead of the above-mentioned COMM communication that seesaws (12), between above-mentioned COMM communication that seesaws (12) and above-mentioned speed change gear (11), has the 2nd wall of supporting them, rear at above-mentioned speed change gear (11) has the 3rd wall, has pto (343) at the rear of above-mentioned the 3rd wall.

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