WO1999050509A1 - Hydraulic shovel - Google Patents
Hydraulic shovel Download PDFInfo
- Publication number
- WO1999050509A1 WO1999050509A1 PCT/JP1998/004132 JP9804132W WO9950509A1 WO 1999050509 A1 WO1999050509 A1 WO 1999050509A1 JP 9804132 W JP9804132 W JP 9804132W WO 9950509 A1 WO9950509 A1 WO 9950509A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- hydraulic
- blade
- spool
- operating
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
- E02F3/325—Backhoes of the miniature type
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/7609—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers
- E02F3/7613—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers with the scraper blade adjustable relative to the pivoting arms about a vertical axis, e.g. angle dozers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
- E02F3/963—Arrangements on backhoes for alternate use of different tools
- E02F3/964—Arrangements on backhoes for alternate use of different tools of several tools mounted on one machine
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
- E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
Definitions
- the present invention belongs to the technical field of a hydraulic control device for a hydraulic shovel, particularly a small hydraulic shovel.
- a hydraulic excavator or the like is provided with a plurality of hydraulic actuators and works by appropriately combining the hydraulic actuators.
- the hydraulic oil supply control to each hydraulic actuator is controlled.
- These valves are centrally mounted on one knoll base and mounted on the aircraft.
- a dozer work using a dozer blade may be performed separately from the bucket work.
- the dozer blade needs to be moved up and down on the valve base. It is essential to provide a valve and a spool operating means for operating the spool of the valve, and these are usually provided as standard.
- Some of these dozer blades have special specifications that have a tilt function to raise or lower one side or an angle function to move back and forth, but these special specifications are optional as requested by users and others. It is generally equipped.
- valve base is provided with a spare valve (optional valve) for taking out the external hydraulic pressure in order to support various attachments such as a dozer blade, a hydraulic breaker, pressure, and a pile punching machine.
- a spare knob is used to provide the above functions.
- the spool actuation means of the spare valve includes a pedal operating part 44 (or lever operation) provided on the spool 19 a of the spare valve 19. And the pedal operation section 4 4 can be operated manually (foot movement). And a manual spool actuating means for switching by means of Here, especially in a small hydraulic excavator, it is common to have one spare valve 19 due to space and other reasons. In this case, in order to add a tilt-angle switching function to the dozer blade, a tilt-to-angle switching function is required.
- the switching of the reserve valve be replaced with an automatic switching instead of a manual operation such as a stepping operation of a pedal, so that the selector valve can be switched in conjunction with the switching operation. Is done.
- it is difficult to secure the space for installing the automatic switching mechanism that switches the spare valve and if it is attempted to secure it at a position close to the spare valve, it is difficult because the piping of the hydraulic hose is in the way.
- a link error or the like may be generated and smooth operation may not be performed, and there is a problem.
- a valve unit In addition to disposing blades that move up and down by operating the operating lever, a valve unit is provided with centralized equipment for each valve for controlling the supply of hydraulic oil from the hydraulic pump to a plurality of hydraulic factories.
- a hydraulic excavator having a spool operating means for operating each valve spool on one side of a blade, a hydraulic cylinder for tilt and a hydraulic cylinder for angle are provided on the blade.
- the optional valve provided on the valve unit is used.
- an auxiliary spool operating means for operating a spool of the optional valve is disposed between the spool operating means and a valve unit which is centrally mounted.
- the auxiliary spool actuating means can be arranged close to the spool of the option valve, and the spool actuating means without any looseness can be performed.
- the auxiliary spool operating means of the present invention includes a solenoid, hydraulic cylinder means switched by the operation of the solenoid, a cylinder rod of a cylinder constituting the hydraulic cylinder means, and a spool of an optional valve.
- the hydraulic cylinder means are disposed between the spool operating means and the valve unit, and the connecting means is arranged in parallel with the spool operating means. can do.
- a selector for a blade for supplying pressure oil from a hydraulic pump to a tilt and angle hydraulic cylinder is provided in an oil passage from an option valve switched by the auxiliary spool operating means of the present invention.
- a valve is connected to the selector valve for the blade, and a pilot switching valve for switching the selector valve for the blade is provided.
- the auxiliary spool operating means and the pilot switching valve are selectively switched between tilt and angle operations.
- An operation switch operated to output a command may be provided. Thereby, the auxiliary spool operating means and the pilot switching valve can be switched by operating the operation switch, thereby improving operability.
- the operation switch of the present invention can be provided on a grip portion of an operation lever for moving the blade up and down, whereby the blade can be moved up and down, tilted. Operation and angle operation can be combined into one operation lever, and operability is further improved.
- a delay time is set for the output of the switching command to the auxiliary spool operating means by operating the operation switch of the present invention.
- the pressure oil from the option valve of the present invention is selectively switched and supplied to an option hydraulic operation mechanism different from tilt and angle operations and to the blade selector knob.
- a switching means for switching the optional selector valve based on the operation of the operating tool can be selectively supplied to the optional selector valve in addition to the blade selector valve.
- the optional valve and the optional selector valve of the present invention are such that when the operating tool is operated to operate the optional hydraulic operating mechanism, the optional valve is switched after the optional selector valve is switched. It may be controlled to be switched.
- Fig. 1 is a perspective view of a hydraulic excavator
- Fig. 2 is a plan view with the upper revolving structure removed
- Fig. 3 is a view taken in the direction of arrows A-A in Fig. 2, and
- Fig. 5 is a perspective view of the blade part
- Fig. 6 is a plan view of the valve unit
- Fig. 7 is a plan view of the main part
- Fig. 8 is a side view of the main part
- 9 (A) and 9 (B) are perspective views of the operating lever portion, a perspective view of the grip portion of the operating lever
- FIG. 10 is a block diagram showing a control state in the blade control portion
- FIG. 10 is a block diagram showing a control state in the blade control portion
- FIG. 11 is a blade. Hydraulic circuit diagram for attitude control
- Fig. 12 is an explanatory diagram of the operation of the arm
- Fig. 13 is a plan view showing the battery mounted state
- Figs. 14 (A) and (B) are side views showing the battery mounted state, respectively.
- FIG. 15 is a front view
- FIG. 15 is a hydraulic circuit diagram of blade attitude control according to the second embodiment
- FIG. 16 is a hydraulic circuit diagram of the third embodiment.
- FIG. 17 is a side view of the bell
- FIG. 17 is an enlarged plan view of a main part according to the third embodiment
- FIG. 18 is a view taken along the arrow A in FIG. 17, and
- FIG. 19 is a control unit according to the third embodiment.
- FIG. 20 is a control block diagram showing a control state in the control unit in the third embodiment
- FIG. 21 is a block diagram showing a control state in the third embodiment
- FIG. 22 is a hydraulic circuit diagram of blade attitude control and breaker operation control according to the embodiment
- FIG. 22 is a perspective view of a part of an operation lever according to the fourth embodiment
- FIGS. 23 (A) and (B) are conventional figures. It is the top view and side view which show an example.
- FIGS. 1 to 14 a first embodiment is shown in FIGS. 1 to 14, in which 1 is a small hydraulic excavator body, and the body 1 is a crawler type lower traveling body 2, Upper revolving structure 3 provided on lower traveling structure 2 for free rotation, operation formed on upper revolving structure 3 ⁇ ⁇ It is composed of various member devices such as mulberry vertical section 4 and working section 5 extending from upper revolving structure 3. All are the same as before.
- Reference numeral 6 denotes a pair of left and right arms which support the lower traveling body 2 so that the S3 ⁇ 4 portion is pivotable up and down.
- a bracket 7 is physically connected between the distal ends of the arms 6.
- a tilt support shaft 8 whose axis is oriented in the front-rear direction is rotatably supported on the lower side of the bracket 7 at the front center in the left-right direction so as to be rotatable around the axis.
- the front end of the tilt support shaft 8 is
- the bracket (dozer blade) 10 is provided with a bracket 10a provided on the rear surface of the blade 10 via an angle support shaft 9 whose axis is oriented in the vertical direction. Supported.
- 11 L and 11 R are left and right angle hydraulic cylinders, and each of the hydraulic cylinders 11 L and 11 R is connected to each arm 6 whose 3 ⁇ 4i portion is supported via a support shaft 11 a. It is swingably supported, and its front end is swingably supported on the right and left back surfaces of the blade 10 via support shafts 11b.
- the left and right angle cylinders 11 L and 11 R perform reciprocal expansion and contraction, so that the blade 10 swings forward and backward with the angle support shaft 9 as a fulcrum.
- the blade 10 is configured to have an angle posture in which the left and right positions are inclined forward and backward.
- reference numeral 12 denotes a hydraulic cylinder for tilt.
- the hydraulic cylinder 12 includes a support shaft 12 provided on the bracket 7 so that the S portion is concentrically located with respect to the support shaft 9 for angle. a is pivotally supported by a, while the tip is positioned concentrically with respect to the support shaft 1 lb that supports the tip of one of the angle hydraulic cylinders 11 (left side in this embodiment).
- W denotes a hydraulic cylinder for tilt.
- the hydraulic cylinder 12 includes a support shaft 12 provided on the bracket 7 so that the S portion is concentrically located with respect to the support shaft 9 for angle. a is pivotally supported by a, while the tip is positioned concentrically with respect to the support shaft 1 lb that supports the tip of one of the angle hydraulic cylinders 11 (left side in this embodiment).
- the blade 10 is swingably supported by a support shaft 12 b provided on the blade 10.
- the tilt hydraulic cylinder 12 expands and contracts as described later, the blade 10 swings up and down around the tilt support shaft 8, thereby changing to a tilt posture.
- Reference numeral 13 denotes a hydraulic cylinder for vertically moving up and down the blade provided between the lower traveling body 2 and the bracket 7a.
- Each of the hydraulic cylinders 11 L, 11 R, and 12 is connected by piping to a later-described blade selector valve 14 attached to the left arm 6 as an external member.
- 4 further includes a pilot pressure oil force bracket 16 and an operating pressure oil force bracket 17 provided for an optional attachment to a rotary joint 15 provided between the undercarriage 2 and the upper revolving superstructure 3. It is connected to a pipe, which allows each hydraulic cylinder 11 L, 11 R, 12 and a spare valve (optional valve of the present invention) 19 pre-installed in a valve unit (main valve) 18 described later. Force; connected to configure the oil path for tilting and changing the attitude of blade 10.
- the valve unit 18 has a plurality of valves assembled and assembled in a row (centralized equipment).
- the valve unit 18 has a valve base 20 fixed to the lower surface thereof and a rubber damper 2. It is fixed to the main frame 3a of the upper swing body 3 with 0a interposed.
- the valve unit 18 is, for example, a valve for controlling the supply of pressurized oil to the working unit 5 or a valve for controlling the supply of pressurized oil to the rotary joint 15 and the rotary motor 15a.
- a plurality of knob spools 18a of these knob groups are arranged so as to protrude inward in the left-right direction of the fuselage.
- the above-mentioned spare knob 19 is arranged.
- 15b is a turning circle.
- Reference numeral 21 denotes a bracket positioned inside the valve unit 18 and fixed to the valve base 20.
- the bracket 21 includes two first and second phosphors in a state of being arranged vertically.
- Shafts 22 and 23 are supported.
- the first and second link shafts 22 and 23 are formed to be long left and right, and a plurality of link bosses 22a and 23a are rotatably supported in a state of being adjacent to each other: ⁇
- One link arm 2 2b, integrally formed with the link boss 2 2a, 2 3a 23 b are respectively connected to the corresponding valve spools 18a via connecting links 22c and 23c.
- each link boss 2 2a, 23 a swings based on each operation such as an operation lever connected to the other link arm 2 2d, 23 d, whereby a necessary valve is provided. It is set so as to perform the valve switching operation by performing the push / pull operation of the spool 18a, and thus the spool operating means is constituted.
- one of the link bosses 22 a pivotally supported by the first link wheel 22 located on the upper side, one of the link bosses (lower side in FIG. 6) faces the spare valve 19.
- the opposite link boss constitutes an auxiliary spool operating means of the present invention as a spare link boss 22e, and pushes and pulls the spare spool 19a to operate the spare valve 19 as described later. It is configured to switch. That is, a spare link arm 22 f is physically protruded from the other side of the spare link boss 22 e, and the spare link arm 22 f is provided via the connecting link 22 g. It is linked to the spool 19a.
- a pair of link arms 22 h and 22 i projecting up and down is formed on one side of the link boss 22 e, and one of these link arms 22 h and 22 i is formed.
- a connecting means is constituted by connecting an operating means for moving the link boss 22 e to one of them, and in this embodiment, a hydraulic cylinder means 24 described later is attached to the lower link arm 22 i.
- the spare link boss 22 e swings based on the operation of the hydraulic cylinder means 24, whereby the spare spool 19 a is pushed and pulled to actuate the spare lube 19.
- the hydraulic cylinder means 24 is constituted by an operating hydraulic cylinder 25 and an electromagnetic switching valve 26 disposed on the upper surface thereof.
- the operating hydraulic cylinder 25 is composed of a cylinder cylinder 25a and a cylinder load 25b, and the cylinder end of the cylinder cylinder 25a is fixed in abutting manner to the upright piece 27a.
- the cylinder rod 25b projects rearward while penetrating the upright piece 27a, and the projecting end portion 25c is connected to the lower link arm 22i of the spare link boss 22e. 5d, and the auxiliary spool actuation in which the connecting means and the hydraulic cylinder means 24 are connected. Means are configured.
- the hydraulic cylinder means 24 is a three-position switching valve having a ⁇ standing position provided for left and right operation, and an electromagnetic switching valve 26 corresponding to a first pilot switching valve described later.
- the solenoids 26 L and 26 R operate, hydraulic oil is supplied to the cylinder cylinder 25 a, and based on this, the cylinder rod 25 b moves to move through the lower link arm 22 i.
- the spare link boss 22 e is swung to push and pull the spare spool 19 a, so that the spare valve 19 can be automatically switched.
- the spool actuating means includes a spare spool 19 a, which is provided in advance, a spare link boss 2 2 e, a link arm 22 f, a connecting link 22, and upper and lower link arms 22 h and 22 i. Is already attached.
- the configuration is the same as that of the conventional example, but in the form of the present sickle, not only the upper link arm 22 h but also the lower side
- the link arm 22 i facing the body is formed so that when the pedal device 44 is removed, the hydraulic cylinder means 24 is connected to the lower link arm 22 i so that the necessary By performing piping, it is possible to change to a configuration in which the spare valve 19 is automatically switched and operated.
- the operation lever L is an operation lever disposed on the operation control section 4, and the operation lever L is configured to operate the hydraulic cylinder 13 for vertically moving the blade up and down by operating the front and rear directions. ing. Further, the grip portion of the operation lever L is provided with four operation switches, that is, tilt operation switches 28 and 29 and angle operation switches 30 and 31. These operation switches 28, 29, 30 and 31 are connected to a blade control unit 32 configured using a micro-computer and the like. A setting for outputting a control signal to the first pilot switching valve (electromagnetic switching valve of auxiliary spool operating means) 26 and a second pilot switching valve 33 described later based on the input of the switch signal of the operation switch 28 to 31 It has become.
- the first pilot switching valve electromagagnetic switching valve of auxiliary spool operating means
- the second pilot switching valve 33 is connected to the selector valve 14 for the blade, and switches the selector valve 14 for the blade to either the tilt side or the angle side, but one switching solenoid 33 3 a two-position switching valve with a
- the solenoid 33a is not in operation, it is switched to the side (tilt side) for supplying hydraulic oil to the tilt hydraulic cylinder 12 as described later by receiving the urging force of the return spring 3b. It has become.
- Pm is a main hydraulic pump
- Ps is a sub-hydraulic pump, both of which are activated based on the driving of an engine (not shown).
- the oil is supplied to a spare valve 19 serving as a main switching valve, and the oil is supplied to the selector valve 14 for the blade by switching the spare valve 19.
- the switching of the reserve valve 19 is performed by supplying the pilot pressure oil from the sub-hydraulic pump Ps to the operating hydraulic cylinder 25 serving as a pilot cylinder as described above.
- the operating hydraulic cylinder 25 is switched in response to switching of the first pilot switching valve (electromagnetic switching valve) 26 corresponding to tilt or angle operation.
- the selector knob 14 is for switching the supply of pressurized oil to the tilt hydraulic cylinders 12 or the angle hydraulic cylinders 11 L and 11 R.
- the second pilot switching valve 33 is executed by the switching operation.
- the first pilot switching valve 26 is switched to the neutral state, and the second pilot switching valve 33 is switched to the tilt position side. ing.
- the second pilot switching valve 33 closes the pilot pressure oil supply oil passage 14 a from the sub hydraulic pump P s to the selector valve 14 while the pilot tank oil passage 1
- the selector valve 14 receives the urging force of the return spring 14 c and the oil passage 14 d leading to the spare valve 19 is connected to the tilt hydraulic cylinder 12. It is located at the tilt side position communicating with the oil passage 14 e for supplying the pressurized oil.
- the spare valve 19 since the spare valve 19 is in the neutral state, the hydraulic pressure is not supplied from the main hydraulic pump Pm, and the tilt operation is not performed.
- the blade controller 32 when one of the angle operation switches 30 and 31 is operated, the blade controller 32 outputs the operation command of the solenoid 33 a of the second pilot switching valve 33.
- the second pilot switching valve 33 When the second pilot switching valve 33 is switched based on this, the pilot pressure oil supply oil passage 14a of the selector valve 14 is opened, and the pilot pressure oil from the sub hydraulic pump Ps is supplied.
- the selector valve 14 switches to the angle side position.
- the blade controller 32 changes the solenoids 26 L and 26 R on the corresponding side to the first pilot switching valve 26. An operation command is output to any one of the above, and the pilot hydraulic oil from the sub hydraulic pump Ps is supplied to the operating hydraulic cylinder 25.
- the spare valve 19 opens to the corresponding side, and the hydraulic oil from the main hydraulic pump Ps is supplied to the corresponding angle hydraulic cylinders 11 L, 11 R, whereby the blade 10 Is set so that either one of the left and right sides is in the front posture.
- a throttle valve 34 is provided in the pilot pressure oil supply oil passage 14a of the selector valve 14 so as to avoid a sudden switching of the selector valve 14 and to perform a smooth switching without shock. Due to this, the self-delay time T is set to a value corresponding to this switching time (slightly longer than the switching time). In this case, as shown in FIG. 12, the following consideration is given to the working unit 5.
- an arm 36 6 is pivotally supported at the tip of the boom 35, which is swingably supported by the upper revolving structure main frame 3 a, via the swing shaft 36 a, and the arm 36 is
- the boom 35 and the arm 36 are substantially displaced from the bending posture (solid line) that swings downward with the swing shaft 36 a as the fulcrum due to the expansion and contraction of the arm cylinder 37 provided to the boom 35. It is configured to swing up and down in a straight extended posture (virtual line).
- a bucket cylinder 38 is provided on the arm 36, and the bucket 39, which is supported on the tip end of the arm 36, is oscillated in accordance with the expansion and contraction of the bucket cylinder 38, but the bucket cylinder 38 is provided.
- the pipe 38a for supplying pressure oil to the cylinder 38 is drawn out from the main frame 3a side, and passes through the arm 3 via one side of the boom 35 and the upper side of the swing shaft 36a. 6 and connected to the bucket cylinder 38 in this way.
- a piping guide body 36b is provided at the S3 ⁇ 4 portion of the arm 36, and the guide 36b is set so that the upward movement of the piping 38a is regulated. ing.
- the pipe 38 a which is dimensioned to be just the right length in the bent position of the arm 36, will have a surplus due to the transformation of the arm 36 to the extended position, and will escape upward. It is set so as to restrict this in the case where it is set to be so that flapping and damage of the pipe 38a is avoided.
- the fixing plate 41 is addressed to the upper surface of the battery 40, and vertically long fixing bolts 42 are inserted into both sides of the fixing plate 41 located outside the battery 40, and the fixing bolts 41
- the main frame 3a is fixed to the main frame 3a by locking the distal end 42a to a locking portion 3b provided on the main frame 3a.
- the battery 40 has an advantage in that the vertical movement is restricted, and the battery 40 can be prevented from sticking and being displaced.
- a cushion member 43 interposed between the side surface of the battery 40 and the side surface of the main frame 3a is interposed in the fixing bolt 42, and the size of the cushion member 43 is reduced. It is set so that it can respond to changes in battery size by changing it.
- the blade 10 is tilted.
- the spare valve 19 will be used for tilt-angle attitude control, and the spare spool 19 a will be provided with auxiliary spool actuation
- the hydraulic cylinder means 24 controlled by the operation of the operating lever L is attached as the auxiliary spool operating means, and the switching of the hydraulic cylinder means 24 is performed.
- the hydraulic cylinder means 24 is provided with a conventional dead space formed between the valve unit 18 and the first and second link shafts 22, 23 on one side of the valve base 20. Space can be used effectively, and there is no need to secure a separate space for mounting the hydraulic cylinder means 24, and it can be provided in the vicinity of the spare valve 19 can be smoothly push pull operation of the spare spool 1 9 a a (switching operation) can cause fi 1.
- auxiliary spool operating means is fixed together with the valve unit 18 on the valve base 20 provided via the damper 20a in order to avoid vibration from the body frame 3a. Since the operating means is vibration-isolated together with the valve unit 18, even if it vibrates, the same vibration state is obtained, so that a smooth spool operation can be realized and the tilt operation can be controlled accurately.
- a link arm 22 d, a spare link boss 22 e, and upper and lower link arms 22 h and 22 e are provided in advance on the spare spool 19 a as standard equipment. Therefore, the operation mode can be freely changed by selectively providing a manual type that connects the pedal device or the like or an automatic type that connects the hydraulic cylinder means 15 as necessary, and the change work is easy. Can be.
- the operation switch 28 to 31 provided on the operation lever L is a first pilot which is an electromagnetic switching valve of the hydraulic cylinder means 24 for switching the spare spool 19 a of the spare valve 19.
- the switching valve 26 it is connected to the second pilot switching valve 33 for switching the blade selector valve 14 and is operated by one operation switch 28-31.
- the switching control of the corresponding first and second pilot switching valves 26, 33 can be performed, and as a result, the blade 1
- the operability is improved because the operator only needs to selectively press the necessary operation switches 28 to 31.
- these operation switches 28 to 31 are collectively arranged on the grip of the operation lever L for moving the blade 10 up and down, the operation switch for operating the blade 10 is operated. The operability is further improved because the operations are concentrated.
- the first pilot switching valve 26 is switched after the second pilot switching knob 33 is switched, so that the angle-tilt operation is switched. In this case, pressure oil is not supplied to the hydraulic cylinder before switching at the beginning of operation, and smooth cylinder operation can be performed.
- the present invention is not limited to the above-described first embodiment, and may also be a second Hi3 ⁇ 4 type shown in FIG. 53 ⁇ 4 can be.
- a second pilot switching valve 45 for switching the blade selector valve 14 is constituted by a three-position switching valve having a neutral position.
- a second pilot switching knob is provided. 4 5 is in a neutral state when the switch is not operated and is not operated, and when the operation switches 28 to 31 are operated, the pilot pressure is switched to switch the blade selector valve 14 to the corresponding side. It opens an oil passage and can be implemented in this way.
- FIG. 16 to FIG. 22 a third embodiment is shown in FIG. 16 to FIG. 22.
- the same reference numerals are given to components common to (same as) the first embodiment. The details will be omitted with the withdrawal.
- the machine body 1 of the present embodiment is provided with a breaker 46 as an attachment (option attachment) in place of the bucket at the tip of the working section 5, and the oil passage for operating the breaker 46 is the same as that described above. It is provided in a state where it is added to an oil passage for changing the attitude of the blade 10 using the spare valve 19.
- the first and second pilot switching valves 26 based on the operation of the operation lever L are provided for the oil passages for changing the blade 10 into the angle posture and the tilt posture.
- the pressure oil is supplied to the angle cylinders 11 L, 11 R, and the tilt cylinder 12 via the spare valve 19 by switching between, 33.
- the breaker 46 is detachably supported by an arm 36 constituting the working unit 5, and the breaker 46 is provided with a hydraulic operating mechanism (breaker operating mechanism).
- breaker operating mechanism When the pressurized oil is supplied to the cylinder 47, the chisel 46a provided at the tip of the breaker 46 vibrates, so that breaker work such as crushing is performed.
- the piping from the hydraulic cylinder 47 for the breaker passes through an arm 36 and a boom 35 constituting the working unit 5 and a selector valve for a breaker disposed in front of the upper revolving unit 3 (an option of the present invention).
- the breaker selector valve 48 is connected to an oil passage between the externally provided blade selector valve 14 and the spare valve 19, and is connected to the hydraulic fluid supplied through the spare valve 19. Is selected and supplied to either the blade selector valve 14 side or the breaker hydraulic cylinder 47 side.
- reference numeral 49 denotes a pedal corresponding to the operating tool of the present invention provided on the floor of the driving control section 4, and the breaker operation of the chisel 46a is performed by depressing the pedal 49. It is set. That is, the pedal 49 has a structure in which an intermediate portion of a pedal plate 49 a which is long in the front-rear direction is swingably supported on the floor via the support shaft 49 b.
- the breaker operation switches 50 and 51 are set to be switched.
- the switches 50 and 51 are connected to a breaker control unit 52.
- the break force control unit 52 switches the switch signals from the breaker operation switches 50 and 51. Is input, a third pilot switching valve for switching the first pilot switching valve 26 and the breaker selector valve 48 based on the input signal.
- the breaker control unit 52 is housed in the lower part of the operation lever L.
- the third pilot switching valve 53 is connected to the breaker selector valve 48, and the breaker selector valve 48 is connected to either the breaker hydraulic cylinder 47 or the blade selector valve 14. It is set to switch to.
- third party The throttle switching valve 53 is composed of a two-position switching valve having one switching solenoid 53a, and receives the urging force of the return spring 53b when the solenoid 53a is not operated. In this state, as described later, the setting is made so that the pressure can be switched to supply the pressure oil to the blade selector valve 14 side (blade side).
- the pressure oil supplied to the breaker selector valve 48 is switched to be supplied to the breaker hydraulic cylinder 47 or the blade selector valve 14 based on the switching of the breaker selector valve 48.
- the operation is set to be performed by the third pilot switching valve 53.
- the pressure oil that has passed through the breaker selector valve 48 is switched by the blade selector valve 14 so as to be supplied to the tilt hydraulic cylinder 12 or the angle hydraulic cylinders 11 L and 11 R.
- the switching of the blade selector valve 14 is performed by switching the second pilot switching valve 33 in the same manner as in the first embodiment.
- the first pilot switching valve 26 is not operated.
- the third pilot switching valve 53 is switched to the blade side position, and the second pilot switching valve 33 is switched to the tilt side position.
- the third pilot switching valve 53 closes the pilot pressure oil supply oil passage 48a from the sub-hydraulic pump Ps to the breaker selector valve 48, whereby the breaker selector valve 4 8 is set so as to be positioned on the blade side communicating with an oil passage 14 d communicating with the blade selector valve 14 by receiving the urging force of the return bomb 48 b.
- the pedal 49 is depressed forward or backward and any of the corresponding breaker operation switches 50, 51 is operated.
- the break force control unit 52 performs the first and third pilot switching valves 26, 5 based on the operation signal.
- the switching control of 3 is performed, but at this time, the second pilot switching valve 26 is maintained in a state of being switched to the tilt side in a non-operating state.
- the breaker controller 52 outputs an operation command to the solenoid 53 a of the third pilot switching valve 53 based on the signal, and the third pilot switching valve 53 is switched based on this.
- the pilot pressure oil supply oil passage 48 a of the selector valve 48 opens, the pilot pressure oil from the sub-hydraulic pump Ps is supplied, and the breaker selector valve 48 becomes the breaker hydraulic cylinder 47 side. Switch to position.
- the breaker control unit 52 outputs an operation command to the first pilot port switching valve 26, but the breaker control unit 52 is provided with a delay circuit 52a, An operation command is output to the port switching valve 26 when the delay time T has elapsed. Then, one of the solenoids 26 L and 26 R on the corresponding side operates to supply the pilot pressure oil from the sub hydraulic pump Ps to the operating hydraulic cylinder 25. Based on this, the spare valve 19 is opened to the corresponding side, and the hydraulic oil from the main hydraulic pump Ps is supplied to the breaker hydraulic cylinder 47, so that the breaker 46 performs the breaker work. Is set. Incidentally, the breaker hydraulic cylinder 47 is configured to supply pressure oil regardless of which side of the spare valve 19 is opened.
- the breaker 46 will operate even if the user steps on 49 before or after.
- the operation control unit 4 What is necessary is just to depress the pedal 49 provided on the floor of the vehicle, and thereby the breaker 46 can be operated by the breaker 46.
- the blade 10 is deformed by operating one of the operation switches 28 to 31 and the pedal 49 is depressed.
- the breaker 46 can be operated by the breaker 46 attached to the tip of the working unit 5.
- the breaker selector valve 48 is replaced with the spare valve 19 for supplying hydraulic oil and the blade. 10
- the spare valve 19 Provided between the blade selector valve 14 for deforming operation and the spare oil valve 19 and supply the hydraulic oil supplied from the spare valve 19 to the blade side or breaker based on the switching operation of the third pilot switching valve 53. Since the hydraulic cylinder 47 is switched to the hydraulic cylinder side, the pressure oil from one switching valve, the spare valve 19, can be selectively supplied to both the blade transformation and the breaker operation. It is for 1 9 of the co.
- the hydraulic oil can be supplied to a plurality of operating mechanisms without increasing the number of spare switching valves by increasing the size of the valve unit 18, thereby not only reducing the size and weight of the airframe, but also making these mechanisms possible. Both can be retrofitted, making it easy to operate.
- the first and second pilot switching valves 26 and 33 are switched after the second and third pilot switching valves 33 and 53 are switched.
- the switching valves 24, 32 Prior to the switching of the switching valves 24, 32, there was no problem that the hydraulic oil was inadvertently supplied to the hydraulic cylinders 11 L, 11 R, 12 and 47, and smooth operation was achieved. Operations can be performed.
- a delay circuit 52a is provided in the breaker control unit 52 so that the signal output to the first pilot switching valve 26 is obtained from the signal output to the second and third pilot switching valves 33, 53.
- the delay can also be implemented by connecting a diode to the electrical wiring between the breaker controller and the first pilot switching valve.
- a fourth ⁇ form shown in FIG. 22 may be adopted.
- the operation lever for changing the blade is configured to be operated by a joystick type operation lever 54.
- the left tilt and the right tilt posture are controlled by the operation lever 54.
- the left and right angles are controlled by the levers in the forward and backward directions of the levers 54, and a control signal corresponding to the blade controller 32 is output with each lever operation. It is set.
- the operation lever 54 is set to return to the neutral position in the non-operation state.
- the inclination amount of the blade 10 is set to change according to the operation amount of the operation lever 54. Have been.
- the auxiliary spool operating means and the pilot switching valve can be switched by operating the operation switch, thereby improving operability.
- the auxiliary spool operating means can be arranged in close proximity to the spool of the optional valve, and the spool operating means with no looseness can be performed.
- the auxiliary spool actuating means and the pie port switching valve can be switched by operating the operation switch, thereby improving operability.
- the operation switch of the present invention can be provided on a grip portion of an operation lever for moving the blade up and down, whereby the blade can be moved up and down and tilted. Operation and angle operation can be combined into one operation lever, and operability is further improved.
- a delay time can be set for the output of the switching command to the auxiliary spool operating means by operating the operation switch of the present invention.
- the pressure oil from one optional valve is In addition to the selector valve for the blade, it can be selectively supplied to the selector valve for the option. Further, according to claims 6 and 7, the option valve and the option selector valve of the present invention can be combined with the option hydraulic valve. When the operating tool is operated to operate the operating mechanism, the option valve can be controlled to be switched after the option selector valve is switched.
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Hydraulic shovel, in which, when optional functions are to be added by using an optional valve of a hydraulic shovel, ease of operation as an automatic system is improved without impairing its light weight and compactness; comprising an auxiliary spool working means having a hydraulic cylinder means (24) and provided between a spool working means and a valve unit (18), and a selector valve (14) for blade disposed on the path of oil supplied from a hydraulic pump via an auxiliary valve (19) while the auxiliary spool working means is connected to the auxiliary valve (19), wherein the tilt-angle operation of a blade (10) can be carried out by selecting, by switching operation of a control lever (L), between pressure oil supply to hydraulic cylinders (11L, 11R) for angle of the blade (10) and that to a hydraulic cylinder (12) for tilting.
Description
明 細 書 '- 油圧ショベレ 技術分野 Description '-Hydraulic excavator technical field
本発明は、 油圧ショベル、 特に小型の油圧ショベルにおける油圧制御装置の技術分 野に属するものである。 The present invention belongs to the technical field of a hydraulic control device for a hydraulic shovel, particularly a small hydraulic shovel.
一般に、 油圧ショベル等においては、 複数の油圧ァクチユエ一夕が備えられ、 これ ら油圧ァクチユエ一夕を適宜組み合わせて作業をすることになるが、 これら各油圧ァ クチユエ一夕への圧油供給制御をするバルブは、 一つのノ レブべ一スに集中装備され て機体に搭載される。 In general, a hydraulic excavator or the like is provided with a plurality of hydraulic actuators and works by appropriately combining the hydraulic actuators. The hydraulic oil supply control to each hydraulic actuator is controlled. These valves are centrally mounted on one knoll base and mounted on the aircraft.
ところでこのような油圧ショベルにおいて、 バケヅト作業とは別にドーザブレード (ブレード) を用いたドーザ作業をすることがあり、 このようなことに対応するため 、 前記バルブベースには、 ドーザブレードを昇降するためのバルブと、 該バルブのス プールを作動させるためのスプール作動手段を設けることは必須で、 これらのものは 通常標準装備される。 そして、 このようなド一ザブレードのなかには、 左右一方を昇 降させるチルト機能や前後させるアングル機能を持たせた特殊仕様のものがあるが、 このような特殊仕様はユーザ一等の希望によりオプションで装備されるのが一般であ る。 By the way, in such a hydraulic excavator, a dozer work using a dozer blade (blade) may be performed separately from the bucket work. In order to cope with such a situation, the dozer blade needs to be moved up and down on the valve base. It is essential to provide a valve and a spool operating means for operating the spool of the valve, and these are usually provided as standard. Some of these dozer blades have special specifications that have a tilt function to raise or lower one side or an angle function to move back and forth, but these special specifications are optional as requested by users and others. It is generally equipped.
一方、 バルブベースには、 ドーザブレードを始めとして油圧ブレーカ、 圧 、 杭 打ち抜き機等の各種アタッチメントに対応させるため、 外部油圧取出しをするための 予備バルブ (オプション用バルブ) が設けられているのが一般であり、 前記のような 機能を付帯させるためには予備ノ レブを用いることになる。 On the other hand, the valve base is provided with a spare valve (optional valve) for taking out the external hydraulic pressure in order to support various attachments such as a dozer blade, a hydraulic breaker, pressure, and a pile punching machine. Generally, a spare knob is used to provide the above functions.
ところで、 予備バルブのスプール作動手段としては、 ¾*、 図 2 3 (A)、 ( B ) に 示すように、 予備バルブ 1 9のスプール 1 9 aに、 ペダル操作部 4 4 (あるいはレバ 一操作部であってもよい) を連結し、 該ペダル操作部 4 4を手動 (足動) 操作するこ
とにより切換わる手動式のスプール作動手段を設けていた。 とこ で特に小型の油圧 ショベルでは、 スペース等の関係から予備バルブ 1 9は一つとすることが一般で、 そ の場合、 ドーザブレードにチルト—アングル切換え機能を付加するには、 チルトーァ ングル切換え用のセレクタバルブを設ける必要があり、 このため、 前記予備バルブ 1 9の手動による切換え操作の他にセレクタノ ルブを切換えるための切換え操作が別途 必要となり、 操作が面倒かつ煩雑になって操作性に劣るという問題があり、 ここに本 発明が しょうとする課題がある。 By the way, as shown in FIGS. 23 (A) and (B), the spool actuation means of the spare valve includes a pedal operating part 44 (or lever operation) provided on the spool 19 a of the spare valve 19. And the pedal operation section 4 4 can be operated manually (foot movement). And a manual spool actuating means for switching by means of Here, especially in a small hydraulic excavator, it is common to have one spare valve 19 due to space and other reasons. In this case, in order to add a tilt-angle switching function to the dozer blade, a tilt-to-angle switching function is required. It is necessary to provide a selector valve, and therefore, in addition to the manual switching operation of the spare valve 19, a switching operation for switching the selector knob is separately required, which makes the operation complicated and complicated, resulting in poor operability. There is a problem, and here is the subject of the present invention.
そこで前記問題を解決するために、 予備バルブの切換えをペダルの踏み操作等の手 動操作に代えて自動切換えとし、 該切換え操作に連繋してセレクタバルブの切換えが できるように構成することが提唱される。 しかるに、 この場合、 予備バルブの切換え をする自動切換え機構の配設スペースの確保が難しく、 予備バルブに近接した位置に 確保しょうとした場合では油圧ホースの配管が邪魔になって難しい一方で、 遠方に配 した場合ではリンク誤差等の発生が考えられ円滑な作動が行えなくなる惧れがあつて 問題があり、 ここにも本発明が角 夬しょうとする課題がある。 Therefore, in order to solve the above-mentioned problem, it is proposed that the switching of the reserve valve be replaced with an automatic switching instead of a manual operation such as a stepping operation of a pedal, so that the selector valve can be switched in conjunction with the switching operation. Is done. However, in this case, it is difficult to secure the space for installing the automatic switching mechanism that switches the spare valve, and if it is attempted to secure it at a position close to the spare valve, it is difficult because the piping of the hydraulic hose is in the way. However, there is a problem that a link error or the like may be generated and smooth operation may not be performed, and there is a problem.
さらにこの様なものに、 例えばァ一ム先端に取付けられるバケツトに換えてブレー 力のように油圧作動をするものをオプションとして取り付けようとしたときに、 該ブ レ一力用油圧シリンダを接続するための予備ノ ルブが既に使用されていてないことに なる。 この結果、 ブレードのチルト、 アングル作動とブレーカ作動との両者を備えた ものにできないという問題があり、 ここに本発明が解夬しょうとする課題がある。 発明の開示 In addition, when an option that operates hydraulically such as a brake force is to be installed as an option in place of a bucket attached to the tip of the arm, for example, the hydraulic cylinder for brake force is connected. The spare knob is no longer used. As a result, there is a problem that the blade cannot be provided with both the tilt and angle operation and the breaker operation of the blade, and there is a problem to be solved by the present invention. Disclosure of the invention
本発明は、 上記の如き実情に鑑み、 これらの課題を解決することを目的として 創作されたものであって、 上部旋回体が旋回自在に設けられる下部走行体に、 運 転操縦部に配した操作レバーの操作で上下昇降作動をするブレードを配すると共 に、 油圧ポンプから複数の油圧ァクチユエ一夕への圧油供給制御をするための各 バルブが集中装備されるバルブュニッ トを設け、 該バルブュニッ卜の一側部に、 各バルブスプールを作動させるためのスプール作動手段を対向配設してなる油圧 ショベルにおいて、 前記ブレードにチルト用油圧シリンダ、 アングル用油圧シリ
ンダを設け、 これら油圧シリンダへの圧油供給でチルト—ァ グル姿勢の変姿機 能を設けるにあたり、 前記バルブュニッ トに装備したオプション用バルブをチル ト、 アングル用油圧シリンダに圧油供給するためのバルブとし、 該オプション用 バルブのスプールを作動させるための補助スプール作動手段を、 前記スプール作 動手段と集中装備されるバルブュニットとのあいだに配したものである。 SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been created with the object of solving these problems. In addition to disposing blades that move up and down by operating the operating lever, a valve unit is provided with centralized equipment for each valve for controlling the supply of hydraulic oil from the hydraulic pump to a plurality of hydraulic factories. In a hydraulic excavator having a spool operating means for operating each valve spool on one side of a blade, a hydraulic cylinder for tilt and a hydraulic cylinder for angle are provided on the blade. In order to supply the hydraulic oil to these hydraulic cylinders, and to provide the function of changing the tilt angle posture by supplying hydraulic oil to these hydraulic cylinders, in order to supply hydraulic oil to the tilt and angle hydraulic cylinders, the optional valve provided on the valve unit is used. And an auxiliary spool operating means for operating a spool of the optional valve is disposed between the spool operating means and a valve unit which is centrally mounted.
そして、 このようにすることにより、 補助スプール作動手段をオプション用バ ルブのスプールに近接状態で配することができて、 ガ夕付きのないスプール作動 手段を行うことができる。 By doing so, the auxiliary spool actuating means can be arranged close to the spool of the option valve, and the spool actuating means without any looseness can be performed.
このものにおいて、 本発明の補助スプール作動手段は、 ソレノィ ドと、 該ソレ ノィ ドの作動により切換えられる油圧シリンダ手段と、 該油圧シリンダ手段を構 成するシリンダのシリンダロッ ドとオプション用バルブのスプールとを連動連結 する連結手段とから構成されるものとし、 ソレノィ ドおよび油圧シリンダ手段は スプール作動手段とバルブュニッ卜との対向間に配され、 連結手段はスプール作 動手段と平行状に配したものとすることができる。 In this, the auxiliary spool operating means of the present invention includes a solenoid, hydraulic cylinder means switched by the operation of the solenoid, a cylinder rod of a cylinder constituting the hydraulic cylinder means, and a spool of an optional valve. And the hydraulic cylinder means are disposed between the spool operating means and the valve unit, and the connecting means is arranged in parallel with the spool operating means. can do.
また、 このものにおいて、 本発明の補助スプール作動手段により切換えられるォプ シヨン用バルブからの油路には、 油圧ポンプからの圧油をチルト、 アングル用油圧シ リンダへ供給するためのブレード用セレクタバルブを連結し、 該ブレード用セレクタ バルブには、 ブレード用セレクタバルブを切換えるためのパイ口ット切換えバルブを 設け、 前記補助スプール作動手段およびパイロット切換えバルブには、 チルト、 アン グル作動の選択切換え指令を出力するため操作される操作スィツチが設けられている とすることもできる。 これによつて、 操作スイッチの操作で補助スプール作動手段お よびパイロット切換えバルブを切換えることができて、 操作性の改善が計れる。 Further, in this apparatus, a selector for a blade for supplying pressure oil from a hydraulic pump to a tilt and angle hydraulic cylinder is provided in an oil passage from an option valve switched by the auxiliary spool operating means of the present invention. A valve is connected to the selector valve for the blade, and a pilot switching valve for switching the selector valve for the blade is provided. The auxiliary spool operating means and the pilot switching valve are selectively switched between tilt and angle operations. An operation switch operated to output a command may be provided. Thereby, the auxiliary spool operating means and the pilot switching valve can be switched by operating the operation switch, thereby improving operability.
さらに、 このものにおいて、 本発明の操作スィッチは、 ブレードを昇降動するため の操作レバーの握り部に設けられているものとすることができ、 これによつて、 ブレ —ドの上下動、 チルト作動、 アングル作動を一つの操作レバーにまとめることができ 、 操作性がさらに向上する。 Further, in this case, the operation switch of the present invention can be provided on a grip portion of an operation lever for moving the blade up and down, whereby the blade can be moved up and down, tilted. Operation and angle operation can be combined into one operation lever, and operability is further improved.
さらにまた、 このものにおいて、 本発明の操作スィッチを操作したことによる補助 スプール作動手段への切換え指令の出力に遅延時間が設定されているものとすること
ができ、 チルトーアングルの切換えの際に、 補助スプール作動 段がパイロット切換 えバルブより先に切換わつてしまう不具合を回避できる。 Still further, in this apparatus, a delay time is set for the output of the switching command to the auxiliary spool operating means by operating the operation switch of the present invention. When switching the tilt toe angle, it is possible to avoid a problem that the auxiliary spool operation stage is switched earlier than the pilot switching valve.
また、 このものにおいて、 本発明のオプション用バルブからの圧油を、 チルト、 ァ ングル作動とは別のォプション用油圧作動機構と前記ブレードセレクタノヽ"ルブとに選 択的に切換え供給するするためのォプシヨン用セレクタバルブを設けると共に、 操作 具操作に基づいてオプション用セレクタバルブの切換えをするための切換え手段とを 備えて構成されたものとすることができる。 これによつて、 一つのオプション用バル ブからの圧油を、 ブレード用セレクタバルブの他にオプション用セレクタバルブへの 選択して供給できる。 Further, in this apparatus, the pressure oil from the option valve of the present invention is selectively switched and supplied to an option hydraulic operation mechanism different from tilt and angle operations and to the blade selector knob. And a switching means for switching the optional selector valve based on the operation of the operating tool. Pressure oil from the valve can be selectively supplied to the optional selector valve in addition to the blade selector valve.
さらに、 このものにおいて、 本発明のオプション用バルブとオプション用セレ クタバルブとは、 オプション用油圧作動機構の作動をすべく操作具操作した場合 に、 オプション用セレクタバルブが切換わってからオプション用バルブが切換わ るべく制御されているものとすることができる。 図面の簡単な説明 Further, in this apparatus, the optional valve and the optional selector valve of the present invention are such that when the operating tool is operated to operate the optional hydraulic operating mechanism, the optional valve is switched after the optional selector valve is switched. It may be controlled to be switched. BRIEF DESCRIPTION OF THE FIGURES
図 1は油圧ショベルの斜視図、 図 2は上部旋回体を取外した状態の平面図、 図 3は図 2における A— A矢視図、 図 4 ( A ) 、 ( B ) はそれそれ図 2における B 一 B断面図、 C一 C断面図、 図 5はブレード部の斜視図、 図 6バルブユニット部 位の平面図、 図 7は要部の平面図、 図 8は要部の側面図、 図 9 ( A ) , ( B ) は それそれ操作レバー部の斜視図、 操作レバーの握り部の斜視図、 図 1 0はブレー ド用制御部における制御状態を示すブロック図、 図 1 1はブレード姿勢制御の油 圧回路図、 図 1 2はアーム部の作用説明図、 図 1 3はバッテリ取付け状態を示す 平面図、 図 1 4 ( A) 、 ( B ) はそれそれバッテリ取付け状態を示す側面図、 正 面図、 図 1 5は第二の実施の形態におけるブレード姿勢制御の油圧回路図、 図 1 6は第三の実施の形態における油圧ショベルの側面図、 図 1 7は第三の実施の形 態における要部の拡大平面図、 図 1 8は図 1 7の A矢視図、 図 1 9は第三の実施 の形態における制御部における制御状態を示すブロック図、 図 2 0は第三の実施 の形態における制御部における制御状態を示す制御ブロック図、 図 2 1は第三の
実施の形態におけるブレード姿勢制御、 ブレーカ作動制御の油圧回路図、 図 2 2 は第四の実施の形態における操作レバ一部の斜視図、 図 2 3 ( A ) 、 ( B ) はそ れそれ従来例を示す平面図、 側面図である。 発明を実施するための最良の形態 Fig. 1 is a perspective view of a hydraulic excavator, Fig. 2 is a plan view with the upper revolving structure removed, Fig. 3 is a view taken in the direction of arrows A-A in Fig. 2, and Figs. B-B cross-section, C-C cross-section, Fig. 5 is a perspective view of the blade part, Fig. 6 is a plan view of the valve unit, Fig. 7 is a plan view of the main part, Fig. 8 is a side view of the main part, 9 (A) and 9 (B) are perspective views of the operating lever portion, a perspective view of the grip portion of the operating lever, FIG. 10 is a block diagram showing a control state in the blade control portion, and FIG. 11 is a blade. Hydraulic circuit diagram for attitude control, Fig. 12 is an explanatory diagram of the operation of the arm, Fig. 13 is a plan view showing the battery mounted state, Figs. 14 (A) and (B) are side views showing the battery mounted state, respectively. FIG. 15 is a front view, FIG. 15 is a hydraulic circuit diagram of blade attitude control according to the second embodiment, and FIG. 16 is a hydraulic circuit diagram of the third embodiment. FIG. 17 is a side view of the bell, FIG. 17 is an enlarged plan view of a main part according to the third embodiment, FIG. 18 is a view taken along the arrow A in FIG. 17, and FIG. 19 is a control unit according to the third embodiment. FIG. 20 is a control block diagram showing a control state in the control unit in the third embodiment, and FIG. 21 is a block diagram showing a control state in the third embodiment. FIG. 22 is a hydraulic circuit diagram of blade attitude control and breaker operation control according to the embodiment, FIG. 22 is a perspective view of a part of an operation lever according to the fourth embodiment, and FIGS. 23 (A) and (B) are conventional figures. It is the top view and side view which show an example. BEST MODE FOR CARRYING OUT THE INVENTION
次に、 本発明の実施の形態を図面に基づいて説明する。 Next, embodiments of the present invention will be described with reference to the drawings.
まず、 第一の実施の形態を図 1〜図 1 4に示すが、 該図面において、 1は小型の油 圧ショベルの機体であって、 該機体 1は、 クローラ型の下部走行体 2、 該下部走行体 2に旋回自在に設けられる上部旋回体 3、 上部旋回体 3に形成される運転 ί桑縦部 4、 上部旋回体 3から延設される作業部 5等の各種部材装置により構成されていることは 何れも従来通りである。 First, a first embodiment is shown in FIGS. 1 to 14, in which 1 is a small hydraulic excavator body, and the body 1 is a crawler type lower traveling body 2, Upper revolving structure 3 provided on lower traveling structure 2 for free rotation, operation formed on upper revolving structure 3 さ れ It is composed of various member devices such as mulberry vertical section 4 and working section 5 extending from upper revolving structure 3. All are the same as before.
6は下部走行体 2に S¾部が上下揺動自在に軸支される左右一対のアームであって 、 該アーム 6の先端部間にはブラケット 7がー体的に連結されている。 このブラケッ ト 7の左右方向中央前部下側には、 軸心が前後方向を向いたチルト用支軸 8が軸周り 方向回動自在に軸支されており、 該チルト用支軸 8の前端部には、 軸心が上下方向を 向くアングル用支軸 9を介してブレード (ドーザブレード) 1 0の後面に設けたブラ ケット 1 0 aがアングル用支軸 9の軸周り方向揺動自在に軸支されている。 Reference numeral 6 denotes a pair of left and right arms which support the lower traveling body 2 so that the S¾ portion is pivotable up and down. A bracket 7 is physically connected between the distal ends of the arms 6. A tilt support shaft 8 whose axis is oriented in the front-rear direction is rotatably supported on the lower side of the bracket 7 at the front center in the left-right direction so as to be rotatable around the axis. The front end of the tilt support shaft 8 is The bracket (dozer blade) 10 is provided with a bracket 10a provided on the rear surface of the blade 10 via an angle support shaft 9 whose axis is oriented in the vertical direction. Supported.
1 1 L、 1 1 Rは左右のアングル用油圧シリンダであって、 該各油圧シリンダ 1 1 L、 1 1 Rは、 何れも ¾i 部が支軸 1 1 aを介して対応する各アーム 6に揺動自在に 支持され、 前端部がブレード 1 0の左右両側裏面に支軸 1 1 bを介して揺動自在に支 持されている。 そして後述するように、 左右のアングル用シリンダ 1 1 L、 1 1 Rが 背反的な伸縮作動をすることで、 ブレード 1 0は、 アングル用支軸 9を支点として前 後方向に揺動することになつてブレード 1 0は、 左右位置が前後に傾斜したアングル 姿勢となるように構成されている。 11 L and 11 R are left and right angle hydraulic cylinders, and each of the hydraulic cylinders 11 L and 11 R is connected to each arm 6 whose ¾i portion is supported via a support shaft 11 a. It is swingably supported, and its front end is swingably supported on the right and left back surfaces of the blade 10 via support shafts 11b. As will be described later, the left and right angle cylinders 11 L and 11 R perform reciprocal expansion and contraction, so that the blade 10 swings forward and backward with the angle support shaft 9 as a fulcrum. In the meantime, the blade 10 is configured to have an angle posture in which the left and right positions are inclined forward and backward.
一方、 1 2はチルト用油圧シリンダであって、 該油圧シリンダ 1 2は、 S¾部が前 記アングル用支軸 9に対して同心状に位置する関係でブラケヅト 7に設けられた支軸 1 2 aに揺動自在に支持される一方、 先端部がアングル用油圧シリンダ 1 1の何れか —方 (本実施の形態では左側) の先端部を支持する支軸 1 l bに対して同心状に位置
W On the other hand, reference numeral 12 denotes a hydraulic cylinder for tilt. The hydraulic cylinder 12 includes a support shaft 12 provided on the bracket 7 so that the S portion is concentrically located with respect to the support shaft 9 for angle. a is pivotally supported by a, while the tip is positioned concentrically with respect to the support shaft 1 lb that supports the tip of one of the angle hydraulic cylinders 11 (left side in this embodiment). W
する関係でブレード 1 0に設けられた支軸 1 2 bに揺動自在に支持されている。 そし て、 チルト用油圧シリンダ 1 2が後述するように伸縮作動することで、 ブレード 1 0 はチルト用支軸 8を軸心にして上下方向に揺動し、 これによつてチルト姿勢に変姿で きるようになつている。 尚、 1 3は下部走行体 2とブラケット 7 aとのあいだに設け られたブレード上下昇降用の油圧シリンダである。 In this relation, the blade 10 is swingably supported by a support shaft 12 b provided on the blade 10. When the tilt hydraulic cylinder 12 expands and contracts as described later, the blade 10 swings up and down around the tilt support shaft 8, thereby changing to a tilt posture. You can now. Reference numeral 13 denotes a hydraulic cylinder for vertically moving up and down the blade provided between the lower traveling body 2 and the bracket 7a.
前記各油圧シリンダ 1 1 L、 1 1 R、 1 2は左側アーム 6に外付け部材として取付 けられた後述のブレード用セレクタバルブ 1 4にそれぞれ配管接続されているが、 該 ブレード用セレクタバルブ 1 4は、 下部走行体 2と上部旋回体 3とのあいだに設けら れるロータリジョイント 1 5にオプションのアタッチメント用として設けられたパイ ロヅト圧油用力ブラ 1 6と作動圧油用力ブラ 1 7にさらに配管接続されており、 これ によって、 各油圧シリンダ 1 1 L、 1 1 R、 1 2と後述するバルブュニット (メイン バルブ) 1 8に予め組込まれた予備バルブ (本発明のオプション用バルブ) 1 9と力; 接続され、 ブレード 1 0のチルト、 アングル姿勢変姿用の油路を構成する設定となつ ている。 Each of the hydraulic cylinders 11 L, 11 R, and 12 is connected by piping to a later-described blade selector valve 14 attached to the left arm 6 as an external member. 4 further includes a pilot pressure oil force bracket 16 and an operating pressure oil force bracket 17 provided for an optional attachment to a rotary joint 15 provided between the undercarriage 2 and the upper revolving superstructure 3. It is connected to a pipe, which allows each hydraulic cylinder 11 L, 11 R, 12 and a spare valve (optional valve of the present invention) 19 pre-installed in a valve unit (main valve) 18 described later. Force; connected to configure the oil path for tilting and changing the attitude of blade 10.
さて、 前記バルブュニット 1 8は複数のバルブが一列状に集合組付け (集中装備) されたものになっているが、 該バルブユニット 1 8は、 その下面に固定されるバルブ ベース 2 0がゴムダンバ 2 0 aを介在する状態で上部旋回体 3のメインフレーム 3 a に止着されている。 このバルブュニット 1 8は、 例えば前記作業部 5に圧油供給制御 をするためのバルブや、 ロー夕リジョイント 1 5およびロータリモ一夕 1 5 aへの圧 油供給制御をするためのバルブ等のノ レブ群で構成され、 これらノ レブ群の複数のノ ルブスプール 1 8 aは機体の左右方向内方に向けて突出する姿勢で配されているが、 ノ "レブュニット 1 8の左右方向略中間位置に前記予備ノ ルブ 1 9が配されている。 尚、 図中、 1 5 bは旋回サークルである。 The valve unit 18 has a plurality of valves assembled and assembled in a row (centralized equipment). The valve unit 18 has a valve base 20 fixed to the lower surface thereof and a rubber damper 2. It is fixed to the main frame 3a of the upper swing body 3 with 0a interposed. The valve unit 18 is, for example, a valve for controlling the supply of pressurized oil to the working unit 5 or a valve for controlling the supply of pressurized oil to the rotary joint 15 and the rotary motor 15a. A plurality of knob spools 18a of these knob groups are arranged so as to protrude inward in the left-right direction of the fuselage. The above-mentioned spare knob 19 is arranged.In the figure, 15b is a turning circle.
2 1はバルブュニット 1 8の内方に位置してバルブベース 2 0に固定されるブラケ ッ卜であって、 該ブラケヅト 2 1には、 上下に並列する状態で二本の第一、 第二リン ク軸 2 2、 2 3が支持されている。 これら第一、 第二リンク軸 2 2、 2 3は左右に長 く形成され、 複数のリンクボス 2 2 a、 2 3 aが隣接する状態で回動自在に軸支され る:^、 これら各リンクボス 2 2 a、 2 3 aに一体形成される一方のリンク腕 2 2 b、
2 3 bが連結リンク 2 2 c、 2 3 cを介して対応するパルブスプール 1 8 aにそれそ れ連結されている。 そして、 各リンクボス 2 2 a、 2 3 aは、 他方のリンク腕 2 2 d 、 2 3 dに連結される操作レバ一等の各操作に基づいて揺動し、 これによつて必要な バルブスプール 1 8 aの押し引き作動を行ってバルブ切換え操作をするように設定さ れており、 このようにしてスプール作動手段が構成されている。 Reference numeral 21 denotes a bracket positioned inside the valve unit 18 and fixed to the valve base 20. The bracket 21 includes two first and second phosphors in a state of being arranged vertically. Shafts 22 and 23 are supported. The first and second link shafts 22 and 23 are formed to be long left and right, and a plurality of link bosses 22a and 23a are rotatably supported in a state of being adjacent to each other: ^ One link arm 2 2b, integrally formed with the link boss 2 2a, 2 3a 23 b are respectively connected to the corresponding valve spools 18a via connecting links 22c and 23c. Then, each link boss 2 2a, 23 a swings based on each operation such as an operation lever connected to the other link arm 2 2d, 23 d, whereby a necessary valve is provided. It is set so as to perform the valve switching operation by performing the push / pull operation of the spool 18a, and thus the spool operating means is constituted.
そして、 前記上側に位置する第一リンク車由 2 2に軸支されるリンクボス 2 2 aのう ち、 一側部 (図 6における下側) のものが前記予備バルブ 1 9に対向しており、 該対 向部位のリンクボスが予備リンクボス 2 2 eとして本発明の補助スプール作動手段を 構成しており、 後述するように予備スプール 1 9 aを押し引き作動して予備バルブ 1 9を切換えるように構成されている。 つまり、 前記予備リンクボス 2 2 eの他側部に は予備リンク腕 2 2 fがー体的に突設されており、 該予備リンク腕 2 2 fが連結リン ク 2 2 gを介して予備スプール 1 9 aに連動連結されている。 一方、 リンクボス 2 2 eの一側部には、 上下に突出する一対のリンク腕 2 2 h、 2 2 iがー体形成されてお り、 これらリンク腕 2 2 h、 2 2 iの何れか一方にリンクボス 2 2 eを摇動させるた めの作動手段を連結することで連結手段が構成され、 本^の形態では、 下側リンク 腕 2 2 iに後述する油圧シリンダ手段 2 4を連結することで、 該油圧シリンダ手段 2 4の操作に基づいて予備リンクボス 2 2 eが揺動し、 これによつて、 予備スプール 1 9 aを押し引き作動して予備ノ、"ルブ 1 9の切換えがなされるように設定されている。 前記油圧シリンダ手段 2 4は、 作動用油圧シリンダ 2 5とその上面に配される電磁 切換え弁 2 6とで構成される力 該油圧シリンダ手段 2 4はバルブュニヅト 1 8の一 側部であって、 かつバルブュニット 1 8と第一、 第二リンク軸 2 2 , 2 3とのあいだ に配されるようになっており、 該対応部位のバルブベース 2 0上に固定された略 L字 状の取付けブラケット 2 7の起立片 2 7 aを介して設けられている。 そして、 前記作 動用油圧シリンダ 2 5は、 シリンダ筒 2 5 aとシリンダロヅ ド 2 5 bとで構成されて おり、 シリンダ筒 2 5 aの筒端が前記起立片 2 7 aに突当て状に固定され、 またシリ ンダロッド 2 5 bは起立片 2 7 aを貫通する状態で後方に突出し、 該突出端部 2 5 c が前記予備リンクボス 2 2 eの下側リンク腕 2 2 iにリンク杆 2 5 dを介して連結さ れており、 而して連結手段と油圧シリンダ手段 2 4とが連結された補助スプール作動
手段が構成されている。 Then, of the link bosses 22 a pivotally supported by the first link wheel 22 located on the upper side, one of the link bosses (lower side in FIG. 6) faces the spare valve 19. The opposite link boss constitutes an auxiliary spool operating means of the present invention as a spare link boss 22e, and pushes and pulls the spare spool 19a to operate the spare valve 19 as described later. It is configured to switch. That is, a spare link arm 22 f is physically protruded from the other side of the spare link boss 22 e, and the spare link arm 22 f is provided via the connecting link 22 g. It is linked to the spool 19a. On the other hand, a pair of link arms 22 h and 22 i projecting up and down is formed on one side of the link boss 22 e, and one of these link arms 22 h and 22 i is formed. A connecting means is constituted by connecting an operating means for moving the link boss 22 e to one of them, and in this embodiment, a hydraulic cylinder means 24 described later is attached to the lower link arm 22 i. By being connected, the spare link boss 22 e swings based on the operation of the hydraulic cylinder means 24, whereby the spare spool 19 a is pushed and pulled to actuate the spare lube 19. The hydraulic cylinder means 24 is constituted by an operating hydraulic cylinder 25 and an electromagnetic switching valve 26 disposed on the upper surface thereof. Is one side of the valve unit 18, and the valve unit 18 and the first and second link shafts 2 2, 2 3, and is provided via an upright piece 27a of a substantially L-shaped mounting bracket 27 fixed on the valve base 20 at the corresponding portion. The operating hydraulic cylinder 25 is composed of a cylinder cylinder 25a and a cylinder load 25b, and the cylinder end of the cylinder cylinder 25a is fixed in abutting manner to the upright piece 27a. The cylinder rod 25b projects rearward while penetrating the upright piece 27a, and the projecting end portion 25c is connected to the lower link arm 22i of the spare link boss 22e. 5d, and the auxiliary spool actuation in which the connecting means and the hydraulic cylinder means 24 are connected. Means are configured.
そして、 前記油圧シリンダ手段 2 4は、 左右作動用に備えられた Φ立位置をもった 三位置切換えバルブであって後述する第一パイ口ット切換えバルブに相当する電磁切 換え弁 2 6のソレノイ ド 2 6 L、 2 6 Rが作動することにより、 シリンダ筒 2 5 aに 圧油供給をし、 これに基づいてシリンダロッド 2 5 bが移動することで下側リンク腕 2 2 iを介して予備リンクボス 2 2 eを揺動させ、 予備スプール 1 9 aの押し引き作 動をするようになっており、 しかして予備バルブ 1 9の自動的な切換え操作ができる ものである。 The hydraulic cylinder means 24 is a three-position switching valve having a Φ standing position provided for left and right operation, and an electromagnetic switching valve 26 corresponding to a first pilot switching valve described later. When the solenoids 26 L and 26 R operate, hydraulic oil is supplied to the cylinder cylinder 25 a, and based on this, the cylinder rod 25 b moves to move through the lower link arm 22 i. Thus, the spare link boss 22 e is swung to push and pull the spare spool 19 a, so that the spare valve 19 can be automatically switched.
因みに、 スプール作動手段には、 予め装備される予備スプール 1 9 aに対し、 予備 リンクボス 2 2 e、 リンク腕 2 2 f、 連結リンク 2 2 :、 上下のリンク腕 2 2 h、 2 2 iが既に取り付けられた状態になっている。 そして、 上側リンク腕 2 2 hにペダル 装置 4 4を備えた場合では、 前記従来例のものと同様の構成になるが、 本鎌の形態 では、 上側リンク腕 2 2 hだけでなく下側に向くリンク腕 2 2 iがー体形成されてお り、 これによつて、 ペダル装置 4 4を取外した場合に、 下側リンク腕 2 2 iに油圧シ リンダ手段 2 4を連結し、 必要な配管を行うことで、 予備バルブ 1 9を自動式に切換 え作動させる構成に変更することができる。 Incidentally, the spool actuating means includes a spare spool 19 a, which is provided in advance, a spare link boss 2 2 e, a link arm 22 f, a connecting link 22, and upper and lower link arms 22 h and 22 i. Is already attached. In the case where the pedal device 44 is provided on the upper link arm 22 h, the configuration is the same as that of the conventional example, but in the form of the present sickle, not only the upper link arm 22 h but also the lower side The link arm 22 i facing the body is formed so that when the pedal device 44 is removed, the hydraulic cylinder means 24 is connected to the lower link arm 22 i so that the necessary By performing piping, it is possible to change to a configuration in which the spare valve 19 is automatically switched and operated.
さて、 Lは運転操縦部 4に配される操作レバーであって、 該操作レバー Lは前後方 向に操作することで前記ブレード上下昇降用の油圧シリンダ 1 3の伸縮作動を行うよ うに構成されている。 さらに操作レバー Lの握り部にはチルト用操作スィツチ 2 8、 2 9と、 アングル用操作スィツチ 3 0、 3 1との都合四個の操作スィツチが設けられ ている。 そして、 これら操作スィッチ 2 8、 2 9、 3 0、 3 1はマイクロコンビュ一 夕等を用いて構成されたブレード用制御部 3 2に接続されており、 該ブレード用制御 部 3 2では、 これら操作スィツチ 2 8〜3 1のスィツチ信号の入力に基づいて前記第 一パイロット切換えバルブ (補助スプール作動手段の電磁切換え弁) 2 6および後述 する第二パイロヅト切換えバルブ 3 3に制御信号を出力する設定になっている。 L is an operation lever disposed on the operation control section 4, and the operation lever L is configured to operate the hydraulic cylinder 13 for vertically moving the blade up and down by operating the front and rear directions. ing. Further, the grip portion of the operation lever L is provided with four operation switches, that is, tilt operation switches 28 and 29 and angle operation switches 30 and 31. These operation switches 28, 29, 30 and 31 are connected to a blade control unit 32 configured using a micro-computer and the like. A setting for outputting a control signal to the first pilot switching valve (electromagnetic switching valve of auxiliary spool operating means) 26 and a second pilot switching valve 33 described later based on the input of the switch signal of the operation switch 28 to 31 It has become.
ここで、 第二パイロット切換えバルブ 3 3は前記ブレード用セレクタバルブ 1 4に 接続され、 該ブレード用セレクタバルブ 1 4をチルト側またはアングル側の何れかに 切換えるが、 一つの切換え用ソレノィ ド 3 3 aを有した二位置切換えバルブにより構
成されていて、 ソレノィド 3 3 aが非作動状態では復帰弾機 3 bの付勢力を受けて 後述するようにチルト用油圧シリンダ 1 2に圧油供給する側 (チルト側) に切換えら れる設定になっている。 Here, the second pilot switching valve 33 is connected to the selector valve 14 for the blade, and switches the selector valve 14 for the blade to either the tilt side or the angle side, but one switching solenoid 33 3 a two-position switching valve with a When the solenoid 33a is not in operation, it is switched to the side (tilt side) for supplying hydraulic oil to the tilt hydraulic cylinder 12 as described later by receiving the urging force of the return spring 3b. It has become.
次ぎに、 前記アングル用油圧シリンダ 1 1 L、 1 1 Rおよびチルト用油圧シリンダ 1 2への油圧回路について図 1 1に基づいて説明する。 図中、 P mはメインの油圧ポ ンプ、 P sはサブの油圧ポンプであって、 何れも図示しないエンジンの駆動に基づい て起動するものであるが、 メイン油圧ポンプ P mから吐出される圧油は、 メインの切 換えバルブとなる予備バルブ 1 9に供給され、 該予備バルブ 1 9の切換えによって前 記ブレード用セレク夕バルブ 1 4に圧油供給される設定になっている。 Next, a hydraulic circuit to the angle hydraulic cylinders 11 L and 11 R and the tilt hydraulic cylinder 12 will be described with reference to FIG. In the figure, Pm is a main hydraulic pump, and Ps is a sub-hydraulic pump, both of which are activated based on the driving of an engine (not shown). The oil is supplied to a spare valve 19 serving as a main switching valve, and the oil is supplied to the selector valve 14 for the blade by switching the spare valve 19.
一方、 前記予備バルブ 1 9の切換えは、 前述したようにパイロットシリンダとなる 作動用油圧シリンダ 2 5にサブ油圧ポンプ P sからのパイ口ット圧油が供給されるこ とによって実行される力 該作動用油圧シリンダ 2 5は、 チルトもしくはアングル作 動用に対応する前記第一パイロット切換えバルブ (電磁切換え弁) 2 6の切換えに対 応して切換えられる。 また、 セレクタノ 'ルブ 1 4は、 チルト用油圧シリンダ 1 2ある いはアングル用油圧シリンダ 1 1 L、 1 1 Rへの圧油供給の切換えをするものである 力、 該切換え作動は、 前言己第二パイロット切換えバルブ 3 3の切換え作動によって実 行されるようになっている。 On the other hand, the switching of the reserve valve 19 is performed by supplying the pilot pressure oil from the sub-hydraulic pump Ps to the operating hydraulic cylinder 25 serving as a pilot cylinder as described above. The operating hydraulic cylinder 25 is switched in response to switching of the first pilot switching valve (electromagnetic switching valve) 26 corresponding to tilt or angle operation. The selector knob 14 is for switching the supply of pressurized oil to the tilt hydraulic cylinders 12 or the angle hydraulic cylinders 11 L and 11 R. The second pilot switching valve 33 is executed by the switching operation.
つまり、 何れの操作スィッチ 2 8〜3 1も操作していない状態では、 第一パイロッ ト切換えバルブ 2 6は中立状態に、 また第二パイロ ヅト切換えバルブ 3 3はチルト位 置側に切換えられている。 そしてこの状態では、 第二パイロット切換えバルブ 3 3は サブ油圧ポンプ P sからのセレクタバルブ 1 4に対するパイロット圧油供給油路 1 4 aが閉じられる一方で、 セレクタバルブ 1 4のパイロットタンク油路 1 4 bが閧いた 状態になり、 これによつてセレクタバルブ 1 4は、 復帰弾機 1 4 cの付勢力を受けて 予備バルブ 1 9に通じる油路 1 4 dがチルト用油圧シリンダ 1 2に圧油供給する油路 1 4 eに連通するチルト側位置に位置する様になつている。 尤も、 予備バルブ 1 9は 中立状態にあるため、 メイン油圧ポンプ P mからの圧油供給はなされないことになつ てチルト作動はしない。 That is, when none of the operation switches 28 to 31 is operated, the first pilot switching valve 26 is switched to the neutral state, and the second pilot switching valve 33 is switched to the tilt position side. ing. In this state, the second pilot switching valve 33 closes the pilot pressure oil supply oil passage 14 a from the sub hydraulic pump P s to the selector valve 14 while the pilot tank oil passage 1 As a result, the selector valve 14 receives the urging force of the return spring 14 c and the oil passage 14 d leading to the spare valve 19 is connected to the tilt hydraulic cylinder 12. It is located at the tilt side position communicating with the oil passage 14 e for supplying the pressurized oil. However, since the spare valve 19 is in the neutral state, the hydraulic pressure is not supplied from the main hydraulic pump Pm, and the tilt operation is not performed.
この状態から、 チルト用操作スィツチ 2 8、 2 9の何れか一方を押し操作すると、
その操作信号がブレード用制御部 3 2に入力しこれに基づいて第:一、 第二パイロット 切換えバルブ 2 6、 3 3の切換え制御を行うことになるが、 非作動状態で既にチルト 側に切変わっている第二パイロヅト切換えバルブ 3 3に対しては作動指令を出力せず 、 O F F状態のままに維持するのに対し、 第一パイロット切換えバルブ 2 6に対して は、 対応する何れか一方のソレノィ ド 2 6 L、 2 6 Rに対して作動指令を出力するが 、 その出力は、 ブレード用制御部 3 2に内蔵する遅延回路 3 2 aによって予め設定さ れる遅延時間 T (例えば 0 . 5秒) だけ遅延して出力される。 そして、 第一パイロッ ト切換えバルブ 2 6が対応する側に切換えられると、 パイロット圧油が作動用油圧シ リンダ 2 5に供給され、 これに基づいて予備バルブ 1 9が対応する側に切換えられて 開成し、 メイン油圧ポンプ P mからの圧油がチルト用油圧シリンダ 1 2を伸長する側 または縮小する側に供給され、 これによつてブレード 1 0は、 左右何れか一方が上側 に高くなるチルト姿勢に変姿するように設定されている。 In this state, when one of the tilt operation switches 28 and 29 is pressed and operated, The operation signal is input to the blade control unit 32, and based on this, the first and second pilot switching valves 26, 33 are switched, but in the non-operation state, the valve is already switched to the tilt side. The operation command is not output to the changing second pilot switching valve 33 and is kept in the OFF state, whereas the first pilot switching valve 26 is set to one of the corresponding ones. An operation command is output to the solenoids 26 L and 26 R, and the output is output by a delay time T (for example, 0.5) preset by a delay circuit 32 a incorporated in the blade controller 32. The output is delayed by a second). Then, when the first pilot switching valve 26 is switched to the corresponding side, the pilot pressure oil is supplied to the operating hydraulic cylinder 25, and based on this, the spare valve 19 is switched to the corresponding side. When opened, pressure oil from the main hydraulic pump Pm is supplied to the side of extending or contracting the hydraulic cylinder for tilt 12, whereby the blade 10 is tilted such that one of the left and right is raised upward. It is set to transform into a posture.
これに対し、 アングル用操作スィッチ 3 0、 3 1の何れか一方を操作した場合に、 ブレード用制御部 3 2は、 第二パイロット切換えバルブ 3 3のソレノィド 3 3 aの作 動指令を出力し、 これに基づいて第二パイロヅト切換えバルブ 3 3が切換えられるこ とでセレクタバルブ 1 4のパイロット圧油供給油路 1 4 aが開いて、 サブ油圧ポンプ P sからのパイロット圧油が供給され、 セレクタバルブ 1 4がアングル側位置に切換 わる。 一方、 ブレード用制御部 3 2は、 スィッチ操作があった段階から前記遅延時間 Tを経過した段階で、 第一パイロット切換えバルブ 2 6に対して対応する側のソレノ イド 2 6 L、 2 6 Rの何れか一方に作動指令を出力し、 サブ油圧ポンプ P sからのパ イロット圧油を作動用油圧シリンダ 2 5に供給する。 これに基づいて予備バルブ 1 9 が対応する側に開成してメイン油圧ポンプ P sからの圧油が対応するアングル用油圧 シリンダ 1 1 L、 1 1 Rに供給され、 これによつてブレード 1 0は、 左右何れか一方 が前側に位置するァングル姿勢になるように設定されている。 On the other hand, when one of the angle operation switches 30 and 31 is operated, the blade controller 32 outputs the operation command of the solenoid 33 a of the second pilot switching valve 33. When the second pilot switching valve 33 is switched based on this, the pilot pressure oil supply oil passage 14a of the selector valve 14 is opened, and the pilot pressure oil from the sub hydraulic pump Ps is supplied. The selector valve 14 switches to the angle side position. On the other hand, when the delay time T has elapsed since the switch operation was performed, the blade controller 32 changes the solenoids 26 L and 26 R on the corresponding side to the first pilot switching valve 26. An operation command is output to any one of the above, and the pilot hydraulic oil from the sub hydraulic pump Ps is supplied to the operating hydraulic cylinder 25. Based on this, the spare valve 19 opens to the corresponding side, and the hydraulic oil from the main hydraulic pump Ps is supplied to the corresponding angle hydraulic cylinders 11 L, 11 R, whereby the blade 10 Is set so that either one of the left and right sides is in the front posture.
尚、 セレクタバルブ 1 4のパイロット圧油供給油路 1 4 aには絞りバルブ 3 4が設 けられていて、 セレクタバルブ 1 4の急激な切換えを回避してショックのない円滑な 切換えを行うべく配慮されており、 前言己遅延時間 Tは、 この切換えの時間に対応する (該切換え時間より僅かに長くなる) ベく設定されている。
そしてこのものでは、 図 1 2に示すように、 作業部 5に次のよ な配慮がなされて いる。 つまり、 上部旋回体メインフレーム 3 aに揺動自在に支持されるブーム 3 5の 先端部には揺動軸 3 6 aを介してアーム 3 6 ¾¾部が軸支され、 該アーム 3 6は、 ブ —ム 3 5に設けたァ一ムシリンダ 3 7の伸縮作動に伴い、 揺動軸 3 6 aを支点として 下方揺動する折曲姿勢 (実線) から、 ブーム 3 5とアーム 3 6とが略一直線状となる 伸長姿勢 (仮想線) に上下揺動する構成となっている。 一方、 アーム 3 6にはバケツ トシリンダ 3 8が設けられ、 該バケヅトシリンダ 3 8の伸縮作動に伴いアーム 3 6先 端部に軸承されたバケツト 3 9を揺動作動させる構成となっているが、 バケツトシリ ンダ 3 8に圧油供給するための配管 3 8 aは、 メインフレーム 3 a側から引き出され 、 ブーム 3 5の一側面、 揺動軸 3 6 a部の上側一側部を経由してアーム 3 6の一側部 に至り、 このようにしてバケヅトシリンダ 3 8に接続される設定となっている。 そし てこのものでは、 アーム 3 6の S¾部に配管ガイド体 3 6 bが設けられており、 該ガ ィド体 3 6 bによって前記配管 3 8 aの上動が規制されるように設定されている。 こ のため、 アーム 3 6の折曲姿勢で丁度よい長さになるよう寸法設定される配管 3 8 a が、 アーム 3 6の伸長姿勢への変姿に伴い余剰分が生じて上方に逃げようとした場合 にこれを規制するように設定されており、 配管 3 8 aのばたつきや損傷が回避される ように構成されている。 A throttle valve 34 is provided in the pilot pressure oil supply oil passage 14a of the selector valve 14 so as to avoid a sudden switching of the selector valve 14 and to perform a smooth switching without shock. Due to this, the self-delay time T is set to a value corresponding to this switching time (slightly longer than the switching time). In this case, as shown in FIG. 12, the following consideration is given to the working unit 5. That is, an arm 36 6 is pivotally supported at the tip of the boom 35, which is swingably supported by the upper revolving structure main frame 3 a, via the swing shaft 36 a, and the arm 36 is The boom 35 and the arm 36 are substantially displaced from the bending posture (solid line) that swings downward with the swing shaft 36 a as the fulcrum due to the expansion and contraction of the arm cylinder 37 provided to the boom 35. It is configured to swing up and down in a straight extended posture (virtual line). On the other hand, a bucket cylinder 38 is provided on the arm 36, and the bucket 39, which is supported on the tip end of the arm 36, is oscillated in accordance with the expansion and contraction of the bucket cylinder 38, but the bucket cylinder 38 is provided. The pipe 38a for supplying pressure oil to the cylinder 38 is drawn out from the main frame 3a side, and passes through the arm 3 via one side of the boom 35 and the upper side of the swing shaft 36a. 6 and connected to the bucket cylinder 38 in this way. In this apparatus, a piping guide body 36b is provided at the S¾ portion of the arm 36, and the guide 36b is set so that the upward movement of the piping 38a is regulated. ing. For this reason, the pipe 38 a, which is dimensioned to be just the right length in the bent position of the arm 36, will have a surplus due to the transformation of the arm 36 to the extended position, and will escape upward. It is set so as to restrict this in the case where it is set to be so that flapping and damage of the pipe 38a is avoided.
さらにこのものでは、 図 1 3、 1 4に示すように、 上部旋回体 3に搭載されるバッ テリ 4 0の固定構造においても次のような配慮がなされている。 つまり、 バッテリ 4 0の上面に固定プレート 4 1を宛てがい、 バヅテリ 4 0の外側に位置する固定プレー ト 4 1の両側部に上下に長い固定ボルト 4 2を挿通し、 該固定ボルト 4 2の先端 4 2 aを、 メインフレーム 3 aに設けた係止部 3 bに係止させることでメインフレームに 対する固定がなされている。 これによつて、 バヅテリ 4 0は上下方向の動きが規制さ れ、 ガ夕付きや位置ずれが防止されるという利点がある。 さらに固定ボルト 4 2には 、 バッテリ 4 0側面とメインフレーム 3 a側面とのあいだに介在する状態のクッショ ン材 4 3が介装される構成となっており、 該クッション材 4 3のサイズを変えること でバッテリサイズの変更に対応できるように設定されている。 Further, in this device, as shown in FIGS. 13 and 14, the following considerations are also made in the fixing structure of the battery 40 mounted on the upper-part turning body 3. That is, the fixing plate 41 is addressed to the upper surface of the battery 40, and vertically long fixing bolts 42 are inserted into both sides of the fixing plate 41 located outside the battery 40, and the fixing bolts 41 The main frame 3a is fixed to the main frame 3a by locking the distal end 42a to a locking portion 3b provided on the main frame 3a. As a result, the battery 40 has an advantage in that the vertical movement is restricted, and the battery 40 can be prevented from sticking and being displaced. Further, a cushion member 43 interposed between the side surface of the battery 40 and the side surface of the main frame 3a is interposed in the fixing bolt 42, and the size of the cushion member 43 is reduced. It is set so that it can respond to changes in battery size by changing it.
叙述の如く構成された本発明の第一の実施の形態において、 ブレード 1 0にチルト
—アングル機能 (仕様) を持つようなオプションを実施するには 5 予備バルブ 1 9を チルト一アングル姿勢制御用に用いることになり、 予備スプール 1 9 aに補助スプ一 ル作動手段を設けて予備スプール 1 9 aの切換え制御を行うことになるが、 この場合 に、 補助スプール作動手段として、 操作レノ 一 Lの操作で制御される油圧シリンダ手 段 2 4を取付け、 該油圧シリンダ手段 2 4のシリンダロヅド突出端部 2 5 cと下側リ ンク腕 2 2 eとを連結することで容易に装備することができる。 In the first embodiment of the present invention configured as described above, the blade 10 is tilted. — To implement an option that has an angle function (specification) 5 The spare valve 19 will be used for tilt-angle attitude control, and the spare spool 19 a will be provided with auxiliary spool actuation In this case, the hydraulic cylinder means 24 controlled by the operation of the operating lever L is attached as the auxiliary spool operating means, and the switching of the hydraulic cylinder means 24 is performed. By connecting the protruding end 25c of the cylinder load and the lower link arm 22e, it can be easily installed.
しかもこの場合に、 油圧シリンダ手段 2 4は、 バルブべ一ス 2 0の一側部でバルブ ュニヅト 1 8と第一、 第二リンク軸 2 2 , 2 3とのあいだに形成される従来デッドス ペースとなっているスペースを有効に利用して配設することができて、 油圧シリンダ 手段 2 4を取り付けるためのスペースを別途確保する必要がないうえ、 予備バルブ 1 9に近接した状態で設けることができて、 予備スプール 1 9 aの円滑な押し引き作動 (切換え作動) を fi1わせることができる。 Moreover, in this case, the hydraulic cylinder means 24 is provided with a conventional dead space formed between the valve unit 18 and the first and second link shafts 22, 23 on one side of the valve base 20. Space can be used effectively, and there is no need to secure a separate space for mounting the hydraulic cylinder means 24, and it can be provided in the vicinity of the spare valve 19 can be smoothly push pull operation of the spare spool 1 9 a a (switching operation) can cause fi 1.
しかも、 補助スプール作動手段は、 機体フレーム 3 aからの振動を回避すべくダン パ 2 0 aを介して設けたバルブベース 2 0上に、 バルブュニット 1 8と共に固定され ることになるので、 補助スプール作動手段はバルブュニヅ ト 1 8と共に防振されるう え、 振動しても同じ振動状態となるため、 円滑なスプール作動が実現できて、 チルト 作動を精度よく制御できる。 In addition, the auxiliary spool operating means is fixed together with the valve unit 18 on the valve base 20 provided via the damper 20a in order to avoid vibration from the body frame 3a. Since the operating means is vibration-isolated together with the valve unit 18, even if it vibrates, the same vibration state is obtained, so that a smooth spool operation can be realized and the tilt operation can be controlled accurately.
さらにこのものでは、 標準装備として予備スプール 1 9 aにリンク腕 2 2 d、 予備 リンクボス 2 2 e、 上下のリンク腕 2 2 h、 2 2 eが予め装備されている。 このため 、 ペダル装置等を連繋する手動式、 または油圧シリンダ手段 1 5を連繋する自動式の ものを必要において選択的に設けることで自由に作動様式を変更できることができる うえ、 その変更作業が容易にできる。 Further, in this device, a link arm 22 d, a spare link boss 22 e, and upper and lower link arms 22 h and 22 e are provided in advance on the spare spool 19 a as standard equipment. Therefore, the operation mode can be freely changed by selectively providing a manual type that connects the pedal device or the like or an automatic type that connects the hydraulic cylinder means 15 as necessary, and the change work is easy. Can be.
そしてこのものでは、 操作レバー Lに設けられている操作スィッチ 2 8〜3 1は、 予備バルブ 1 9の予備スプール 1 9 aを切換えるための油圧シリンダ手段 2 4の電磁 切換え弁である第一パイロット切換えバルブ 2 6に連繋されるだけでなく、 前記ブレ —ド用セレクタバルブ 1 4を切換えるための第二パイロット切換えバルブ 3 3に連繋 されており、 一つの操作スイッチ 2 8〜3 1の操作で対応する第一、 第二パイロット 切換えバルブ 2 6、 3 3の切換え制御が行えることになり、 これによつてブレード 1
0をチルト姿勢あるいはアングル姿勢に変姿させる場合に、 オペ:レ一タは、 必要な操 作スィヅチ 2 8〜3 1の選択的な押し操作でよいことになつて操作性が向上する。 しかもこのものでは、 これら各操作スィツチ 2 8〜3 1がブレード 1 0を上下動す るための操作レバ一 Lの握り部にまとめて配されているため、 ブレード 1 0の作動を するための操作が集中して位置されることになつて操作性が一段と向上する。 In this device, the operation switch 28 to 31 provided on the operation lever L is a first pilot which is an electromagnetic switching valve of the hydraulic cylinder means 24 for switching the spare spool 19 a of the spare valve 19. In addition to being connected to the switching valve 26, it is connected to the second pilot switching valve 33 for switching the blade selector valve 14 and is operated by one operation switch 28-31. The switching control of the corresponding first and second pilot switching valves 26, 33 can be performed, and as a result, the blade 1 When changing 0 to the tilt posture or the angle posture, the operability is improved because the operator only needs to selectively press the necessary operation switches 28 to 31. Moreover, in this device, since these operation switches 28 to 31 are collectively arranged on the grip of the operation lever L for moving the blade 10 up and down, the operation switch for operating the blade 10 is operated. The operability is further improved because the operations are concentrated.
そのうえ、 前記操作スィヅチ 2 8〜3 1を操作したときに、 第二パイロット切換え ノ ルブ 3 3が切換えられることを待って第一パイロット切換えバルブ 2 6が切換えら れるため、 アングル—チルト作動の切換えをする場合、 操作当初に切換え前の油圧シ リンダに圧油供給されることがなく、 円滑なシリンダ作動を行うことができる。 In addition, when the operation switches 28 to 31 are operated, the first pilot switching valve 26 is switched after the second pilot switching knob 33 is switched, so that the angle-tilt operation is switched. In this case, pressure oil is not supplied to the hydraulic cylinder before switching at the beginning of operation, and smooth cylinder operation can be performed.
本発明は、 前記第一の実施の形態のものに限定されるものではなく、 さらに図 1 5 に示す第二の Hi¾の形態のものでも! 5¾することができる。 このものは、 ブレード用 セレクタバルブ 1 4を切換えるための第二パイロット切換えバルブ 4 5が、 中立位置 を備えた三位置切換えバルブで構成されたもので、 このものでは、 第二パイロット切 換えノ ルブ 4 5は、 スィッチ操作のな 、非作動時には中立状態となっており、 そして 操作スィッチ 2 8 ~ 3 1が操作されることに伴い、 ブレード用セレクタバルブ 1 4を 対応する側に切換えるべくパイロット圧油の油路を開成するもので、 このようにして も実施することができる。 The present invention is not limited to the above-described first embodiment, and may also be a second Hi¾ type shown in FIG. 5¾ can be. In this device, a second pilot switching valve 45 for switching the blade selector valve 14 is constituted by a three-position switching valve having a neutral position. In this device, a second pilot switching knob is provided. 4 5 is in a neutral state when the switch is not operated and is not operated, and when the operation switches 28 to 31 are operated, the pilot pressure is switched to switch the blade selector valve 14 to the corresponding side. It opens an oil passage and can be implemented in this way.
次に、 第三の実施の形態を図 1 6〜図 2 2に示すが、 該図面において、 第一の 実施の形態と共通するもの (同一のもの) については、 同一の符号を付して引出 すと共にその詳細については省略する。 Next, a third embodiment is shown in FIG. 16 to FIG. 22. In the drawings, the same reference numerals are given to components common to (same as) the first embodiment. The details will be omitted with the withdrawal.
本実施の形態の機体 1は作業部 5先端のバケットに換えてァ夕ツチメント (ォ プシヨンアタッチメント) としてブレーカ 4 6が設けられ、 該ブレーカ 4 6を作 動させるための油路が、 前述の予備バルブ 1 9を用いたブレード 1 0の姿勢変姿 用の油路に追加される状態で設けられている。 The machine body 1 of the present embodiment is provided with a breaker 46 as an attachment (option attachment) in place of the bucket at the tip of the working section 5, and the oil passage for operating the breaker 46 is the same as that described above. It is provided in a state where it is added to an oil passage for changing the attitude of the blade 10 using the spare valve 19.
即ち、 ブレード 1 0をアングル姿勢、 チルト姿勢にそれそれ姿勢変姿するため の油路については、 前述したように、 操作レバ一 Lの操作に基づく第一、 第二パ ィロッ ト切換えバルブ 2 6、 3 3の切換えで、 予備バルブ 1 9を介してアングル 用シリンダ 1 1 L、 1 1 R、 チルト用シリンダ 1 2に圧油が供給される構成とな
つており、 これらの構成は前記第一の実施の形態と同様の構成となっている。That is, as described above, the first and second pilot switching valves 26 based on the operation of the operation lever L are provided for the oil passages for changing the blade 10 into the angle posture and the tilt posture. The pressure oil is supplied to the angle cylinders 11 L, 11 R, and the tilt cylinder 12 via the spare valve 19 by switching between, 33. These configurations are the same as those of the first embodiment.
—方、 前記ブレーカ 4 6は、 作業部 5を構成するアーム 3 6に着脱自在に支持 されているが、 このブレーカ 4 6には油圧作動機構 (ブレーカ作動機構) が備え られ、 該ブレーカ用油圧シリンダ 4 7に圧油を供給することに伴い、 ブレーカ 4 6の先端に設けられたチゼル 4 6 aが振動して、 破砕等のブレーカ作業が行われ るように構成されている。 前記ブレーカ用油圧シリンダ 4 7からの配管は、 作業 部 5を構成するアーム 3 6、 ブーム 3 5を経由して、 上部旋回体 3の前方に配さ れたブレーカ用セレクタバルブ (本発明のオプションセレクタバル部に相当する ) 4 8に配管接続されている。 このブレーカ用セレクタバルブ 4 8は、 前記外付 けされたブレード用セレクタバルブ 1 4と予備バルブ 1 9とのあいだの油路に配 管接続され、 予備バルブ 1 9を介して供給される圧油をブレード用セレクタバル ブ 1 4側またはブレーカ用油圧シリンダ 4 7側の何れかに選択して供給するよう に設定されている。 On the other hand, the breaker 46 is detachably supported by an arm 36 constituting the working unit 5, and the breaker 46 is provided with a hydraulic operating mechanism (breaker operating mechanism). When the pressurized oil is supplied to the cylinder 47, the chisel 46a provided at the tip of the breaker 46 vibrates, so that breaker work such as crushing is performed. The piping from the hydraulic cylinder 47 for the breaker passes through an arm 36 and a boom 35 constituting the working unit 5 and a selector valve for a breaker disposed in front of the upper revolving unit 3 (an option of the present invention). (Equivalent to the selector valve part.) The breaker selector valve 48 is connected to an oil passage between the externally provided blade selector valve 14 and the spare valve 19, and is connected to the hydraulic fluid supplied through the spare valve 19. Is selected and supplied to either the blade selector valve 14 side or the breaker hydraulic cylinder 47 side.
一方、 4 9は運転操縦部 4の床面に設けられた本発明の操作具に相当するペダルで あって、 該ペダル 4 9を踏み操作することで前記チゼル 4 6 aのブレーカ作動が行わ れる設定となっている。 つまり、 前記ペダル 4 9は前後方向に長いペダル板 4 9 aの 中間部が支軸 4 9 bを介して床面に揺動自在に支持される構成となっており、 該支軸 On the other hand, reference numeral 49 denotes a pedal corresponding to the operating tool of the present invention provided on the floor of the driving control section 4, and the breaker operation of the chisel 46a is performed by depressing the pedal 49. It is set. That is, the pedal 49 has a structure in which an intermediate portion of a pedal plate 49 a which is long in the front-rear direction is swingably supported on the floor via the support shaft 49 b.
4 9 bを支点としてペダル板 4 9 aの前方または後方の何れかを踏み操作することで 、 ブレーカ用操作スィヅチ 5 0、 5 1がスィッチ操作される設定となっている。 そし て、 これらスィッチ 5 0、 5 1は、 ブレーカ用制御部 5 2に接続されており、 該ブレ 一力用制御部 5 2では、 これらブレーカ用操作スイッチ 5 0、 5 1からのスィッチ信 号が入力された場合、 該入力信号に基づいて前記第一パイロット切換えバルブ 2 6と 、 前記ブレーカ用セレクタバルブ 4 8を切換えるための第三パイロヅト切換えバルブWhen either the front or the rear of the pedal plate 49a is depressed with the 49b as a fulcrum, the breaker operation switches 50 and 51 are set to be switched. The switches 50 and 51 are connected to a breaker control unit 52. The break force control unit 52 switches the switch signals from the breaker operation switches 50 and 51. Is input, a third pilot switching valve for switching the first pilot switching valve 26 and the breaker selector valve 48 based on the input signal.
5 3に制御信号を出力する設定になっている。 It is set to output the control signal to 53.
因みに、 ブレーカ用制御部 5 2は操作レバ一 Lの下部に収納されている。 また、 第 三パイロヅト切換えバルブ 5 3は、 前記ブレーカ用セレクタバルブ 4 8に接続され、 該ブレーカ用セレクタバルブ 4 8をブレーカ用油圧シリンダ 4 7側または前記ブレー ド用セレクタバルブ 1 4側の何れかに切換えるように設定されている。 また、 第三パ
イロヅト切換えバルブ 5 3は、 一つの切換え用ソレノイド 5 3 aき有した二位置切換 えバルブにより構成されていて、 ソレノイ ド 5 3 aの非作動状態では復帰弾機 5 3 b の付勢力を受けており、 この状態では後述するようにブレード用セレクタバルブ 1 4 側 (ブレード側) に圧油供給するべく切換えられる設定になっている。 Incidentally, the breaker control unit 52 is housed in the lower part of the operation lever L. The third pilot switching valve 53 is connected to the breaker selector valve 48, and the breaker selector valve 48 is connected to either the breaker hydraulic cylinder 47 or the blade selector valve 14. It is set to switch to. Also, third party The throttle switching valve 53 is composed of a two-position switching valve having one switching solenoid 53a, and receives the urging force of the return spring 53b when the solenoid 53a is not operated. In this state, as described later, the setting is made so that the pressure can be switched to supply the pressure oil to the blade selector valve 14 side (blade side).
次ぎに、 前記チルト用油圧シリンダ、 アングル用油圧シリンダ 1 0 R、 1 0 L、 ブ レ一力用油圧シリンダ 2 6への圧油を制御するのための油圧回路について図 2 1に基 づいて説明する。 各油圧ポンプ P m、 P sは図示しないエンジンの駆動に基づいて起 動して、 メイン油圧ポンプ P mから吐出される圧油は、 前記予備バルブ 1 9に供給さ れ、 該予備バルブ 1 9の切換えに基づいてブレーカ用セレクタバルブ 4 8側に供給さ れるように油路が形成されている。 Next, a hydraulic circuit for controlling hydraulic oil to the hydraulic cylinder for tilt, the hydraulic cylinder for angle 10 R, 10 L, and the hydraulic cylinder 26 for brake force will be described with reference to FIG. 21. explain. Each of the hydraulic pumps Pm and Ps is started based on the driving of an engine (not shown), and the hydraulic oil discharged from the main hydraulic pump Pm is supplied to the auxiliary valve 19, and the auxiliary valve 19 The oil passage is formed so as to be supplied to the breaker selector valve 48 side based on the switching of the above.
ブレーカ用セレクタバルブ 4 8に供給される圧油は、 該ブレーカ用セレクタバルブ 4 8の切換えに基づいてブレーカ用油圧シリンダ 4 7あるいはブレード用セレクタバ ルブ 1 4に供給されるよう切換えられるが、 該切換え操作は第三パイロヅト切換えバ ルブ 5 3によりなされるように設定されている。 そして、 ブレーカ用セレクタバルブ 4 8を経由した圧油は、 さらにブレード用セレクタバルブ 1 4によりチルト用油圧シ リンダ 1 2あるいはアングル用油圧シリンダ 1 1 L、 1 1 Rに供給するべく切り換え られるが、 該ブレード用セレクタバルブ 1 4の切換えは第二パイロヅト切換えバルブ 3 3の切換えによりなされることは tiff己第一の実拖の形態と同様になつている。 The pressure oil supplied to the breaker selector valve 48 is switched to be supplied to the breaker hydraulic cylinder 47 or the blade selector valve 14 based on the switching of the breaker selector valve 48. The operation is set to be performed by the third pilot switching valve 53. Then, the pressure oil that has passed through the breaker selector valve 48 is switched by the blade selector valve 14 so as to be supplied to the tilt hydraulic cylinder 12 or the angle hydraulic cylinders 11 L and 11 R. The switching of the blade selector valve 14 is performed by switching the second pilot switching valve 33 in the same manner as in the first embodiment.
このもにおいて、 操作レバ一 Lおよびペダル 4 9の操作がなく、 何れの操作スィ ヅ チ 2 8〜3 1、 5 0、 5 1も操作していない状態では、 第一パイロット切換えバルブ 2 6は中立状態に、 また、 第三パイロット切換えバルブ 5 3はブレード側位置、 そし て第二パイロット切換えバルブ 3 3はチルト側位置に切換えられている。 そしてこの 状態では、 第三パイロット切換えバルブ 5 3はサブ油圧ポンプ P sからのブレーカ用 セレクタバルブ 4 8に対するパイロット圧油供給油路 4 8 aが閉じられ、 これによつ てブレーカ用セレクタバルブ 4 8は復帰弾機 4 8 bの付勢力を受けてブレード用セレ クタバルブ 1 4に通じる油路 1 4 dに連通するブレード側に位置するように設定され ている。 In this case, if the operation lever L and the pedal 49 are not operated and none of the operation switches 28 to 31, 50 and 51 are operated, the first pilot switching valve 26 is not operated. In the neutral state, the third pilot switching valve 53 is switched to the blade side position, and the second pilot switching valve 33 is switched to the tilt side position. In this state, the third pilot switching valve 53 closes the pilot pressure oil supply oil passage 48a from the sub-hydraulic pump Ps to the breaker selector valve 48, whereby the breaker selector valve 4 8 is set so as to be positioned on the blade side communicating with an oil passage 14 d communicating with the blade selector valve 14 by receiving the urging force of the return bomb 48 b.
この状態から、 操作レバー Lからのスイッチ操作があった場合では、 その操作信号
がブレード用制御部 3 2に入力し、 これに基づいて第一、 第二パイロット切換えバル ブ 2 6、 3 3の切換え制御が行われる力 s、 このとき、 第三パイロット切換えバルブ 5 3は非作動状態のままであってブレーカ用セレクタバルブ 4 8はブレード側位置に位 置しており、 第一、 第二パイロット切換えバルブ 2 6、 3 3の切換えに基づいて予備 バルブ 1 9が切換えられ、 メイン油圧ポンプ P mからの圧油がブレーカ用セレクタバ ルブ 4 8を介してチルト用油圧シリンダ 1 2またはアングル用油圧シリンダ 1 1 L、 1 1 Rに適宜供給されてブレード 1 0の姿勢変姿を行うようになっており、 これにつ レ、ては編 3第一の雄の形態と同様の制御状態になっている。 In this state, when a switch is operated from operation lever L, the operation signal Is input to the blade control unit 32, and based on this, the force s at which the switching control of the first and second pilot switching valves 26, 33 is performed. At this time, the third pilot switching valve 53 is not activated. The breaker selector valve 48 remains in the operating state and the breaker selector valve 48 is located at the blade side position, and the spare valve 19 is switched based on the switching of the first and second pilot switching valves 26, 33. Hydraulic oil from the main hydraulic pump P m is supplied to the tilt hydraulic cylinder 12 or the angle hydraulic cylinders 11 L and 11 R via the breaker selector valve 48 as needed to change the attitude of the blade 10. In this case, the control state is the same as that of the first male embodiment.
次に、 ペダル 4 9が前後何れかに踏み込まれ、 対応する何れかのブレーカ用操作ス イッチ 5 0、 5 1がスィツチ操作された場合について説明する。 前記操作スィヅチ 5 0または 5 1が操作されて操作信号がブレーカ用制御部 5 2に入力した場合、 ブレー 力用制御部 5 2はこれに基づいて第一、 第三パイロット切換えバルブ 2 6、 5 3の切 換え制御を行うが、 このとき、 第二パイロット切換えバルブ 2 6は非作動状態でチル ト側に切換わったままの状態に維持されている。 そして、 ブレーカ用制御部 5 2は、 前記信号に基いて第三パイロット切換えバルブ 5 3のソレノイ ド 5 3 aに作動指令を 出力し、 これに基づいて第三パイロット切換えバルブ 5 3が切換えられることでブレ 一力用セレクタバルブ 4 8のパイロット圧油供給油路 4 8 aが開き、 サブ油圧ポンプ P sからのパイロヅト圧油が供給され、 ブレーカ用セレクタバルブ 4 8がブレーカ用 油圧シリンダ 4 7側位置に切換わる。 Next, a case will be described in which the pedal 49 is depressed forward or backward and any of the corresponding breaker operation switches 50, 51 is operated. When the operation switch 50 or 51 is operated and an operation signal is input to the breaker control unit 52, the break force control unit 52 performs the first and third pilot switching valves 26, 5 based on the operation signal. The switching control of 3 is performed, but at this time, the second pilot switching valve 26 is maintained in a state of being switched to the tilt side in a non-operating state. Then, the breaker controller 52 outputs an operation command to the solenoid 53 a of the third pilot switching valve 53 based on the signal, and the third pilot switching valve 53 is switched based on this. The pilot pressure oil supply oil passage 48 a of the selector valve 48 opens, the pilot pressure oil from the sub-hydraulic pump Ps is supplied, and the breaker selector valve 48 becomes the breaker hydraulic cylinder 47 side. Switch to position.
さらに、 ブレーカ用制御部 5 2は第一パイ口ット切換えバルブ 2 6に作動指令を出 力するが、 ブレーカ用制御部 5 2には遅延回路 5 2 aが設けられており、 第一パイ口 ット切換えバルブ 2 6に対しては前記遅延時間 Tを経過した段階で作動指令を出力す る。 そして、 対応する側のソレノィ ド 2 6 L、 2 6 Rの何れか一方が作動してサブ油 圧ポンプ P sからのパイロヅト圧油が作動用油圧シリンダ 2 5に供給される。 これに 基づいて予備バルブ 1 9が対応する側に開成し、 メイン油圧ポンプ P sからの圧油が ブレーカ用油圧シリンダ 4 7に供給され、 これによつてブレーカ 4 6はブレーカ作業 を行うように設定されている。 因みに、 ブレーカ用油圧シリンダ 4 7は予備バルブ 1 9の何れの側が開放されても圧油供給される構成となっており、 これによつてペダル
4 9を前後何れに踏み操作してもブレーカ 4 6の作動が行われる設定となっている。 この第三の実施の形態においては、 作業部 5のアーム 3 6の先端のバケツトを 外し、 破碎用のブレーカ 4 6を取付けて該ブレーカ 4 6によるブレーカ作動を行 いたい場合では、 運転操縦部 4の床面に設けられたペダル 4 9を踏み操作すれば よく、 これによつてブレーカ 4 6によるブレーカ作動を行うことができる。 このように、 第三の実施の形態のものでは、 操作スィッチ 2 8〜 3 1の何れかをス ィツチ操作をすることでブレード 1 0の変姿作動が行われ、 ペダル 4 9を踏み操作す ることで作業部 5の先端に付け換えられたブレーカ 4 6によるブレーカ作動を行うこ とができるが、 この場合に、 ブレーカ用セレクタバルブ 4 8を、 圧油を供給する予備 バルブ 1 9とブレード 1 0変姿作動用のブレード用セレクタバルブ 1 4とのあいだに 設けて、 予備バルブ 1 9から供給される圧油を第三パイロット切換えバルブ 5 3の切 換え作動に基づいてブレード側またはブレーカ用油圧シリンダ 4 7側に切換える構成 としたので、 一つの切換えバルブである予備バルブ 1 9からの圧油を、 ブレード変姿 用とブレーカ作動用の何れにも選択的に供給できることになり、 予備バルブ 1 9の共 用ができる。 この結果、 バルブュニット 1 8を大きくして予備の切換えバルブ数を増 加させることなく複数の作動機構に圧油を供給できることになつて、 機体の小形軽量 化を計れるばかりでなく、 これらの機構を両者共後付けすることもでき、 操作性に優 れたものにできる。 Further, the breaker control unit 52 outputs an operation command to the first pilot port switching valve 26, but the breaker control unit 52 is provided with a delay circuit 52a, An operation command is output to the port switching valve 26 when the delay time T has elapsed. Then, one of the solenoids 26 L and 26 R on the corresponding side operates to supply the pilot pressure oil from the sub hydraulic pump Ps to the operating hydraulic cylinder 25. Based on this, the spare valve 19 is opened to the corresponding side, and the hydraulic oil from the main hydraulic pump Ps is supplied to the breaker hydraulic cylinder 47, so that the breaker 46 performs the breaker work. Is set. Incidentally, the breaker hydraulic cylinder 47 is configured to supply pressure oil regardless of which side of the spare valve 19 is opened. It is set so that the breaker 46 will operate even if the user steps on 49 before or after. In the third embodiment, when the bucket at the tip of the arm 36 of the working unit 5 is removed, a breaker 46 for crushing is attached, and the breaker 46 is operated by the breaker 46, the operation control unit 4 What is necessary is just to depress the pedal 49 provided on the floor of the vehicle, and thereby the breaker 46 can be operated by the breaker 46. As described above, in the third embodiment, the blade 10 is deformed by operating one of the operation switches 28 to 31 and the pedal 49 is depressed. In this case, the breaker 46 can be operated by the breaker 46 attached to the tip of the working unit 5.In this case, the breaker selector valve 48 is replaced with the spare valve 19 for supplying hydraulic oil and the blade. 10 Provided between the blade selector valve 14 for deforming operation and the spare oil valve 19 and supply the hydraulic oil supplied from the spare valve 19 to the blade side or breaker based on the switching operation of the third pilot switching valve 53. Since the hydraulic cylinder 47 is switched to the hydraulic cylinder side, the pressure oil from one switching valve, the spare valve 19, can be selectively supplied to both the blade transformation and the breaker operation. It is for 1 9 of the co. As a result, the hydraulic oil can be supplied to a plurality of operating mechanisms without increasing the number of spare switching valves by increasing the size of the valve unit 18, thereby not only reducing the size and weight of the airframe, but also making these mechanisms possible. Both can be retrofitted, making it easy to operate.
さらにこの場合でも、 第二、 第三パイロット切換えバルブ 3 3、 5 3の切換えを待 つて第一パイロット切換えバルブ 2 6が切換えられる構成としたため、 操作当初に、 第二、 第三パイ口ット切換えバルブ 2 4、 3 2が切換えられる以前の段階で各油圧シ リンダ 1 1 L、 1 1 R、 1 2、 4 7に不用意に圧油が供給されるような不具合がなく なって、 円滑な操作を行うことができる。 Furthermore, in this case, the first and second pilot switching valves 26 and 33 are switched after the second and third pilot switching valves 33 and 53 are switched. Prior to the switching of the switching valves 24, 32, there was no problem that the hydraulic oil was inadvertently supplied to the hydraulic cylinders 11 L, 11 R, 12 and 47, and smooth operation was achieved. Operations can be performed.
この場合に、 ブレーカ用制御部 5 2に遅延回路 5 2 aを設けて、 第一パイロッ ト切換えバルブ 2 6への信号出力を第二、 第三パイロット切換えバルブ 3 3、 5 3に対する信号出力よりも遅れる構成にしている力 該遅れは、 ブレーカ用制御 部と第一パイ口ッ ト切換えバルブとのあいだの電気配線にダイォードを接続する ことでも実施できる。
さらに、 図 2 2に示す第四の^の形態のようにしてもよい。 このものは、 ブレー ド変姿用の操作レバーを、 ジョイスティヅク型の操作レバ一 5 4により行うように構 成されており、 この場合では、 左チルト、 右チルト姿勢を操作レバ一 5 4の左右方向 のレバ一操作で、 左アングル、 右アングル姿勢を操作レバ一 5 4の前後方向のレバー 操作で行い、 各レバー操作に伴い、 ブレード用制御部 3 2に対応する制御信号を出力 する設定となっている。 そして操作レバ一 5 4は、 非操作状態で中立位置に復帰する 設定となっていて、 この場合では、 操作レバ一 5 4の操作量に応じてブレード 1 0の 傾斜量が変化するように設定されている。 In this case, a delay circuit 52a is provided in the breaker control unit 52 so that the signal output to the first pilot switching valve 26 is obtained from the signal output to the second and third pilot switching valves 33, 53. The delay can also be implemented by connecting a diode to the electrical wiring between the breaker controller and the first pilot switching valve. Further, a fourth ^ form shown in FIG. 22 may be adopted. In this device, the operation lever for changing the blade is configured to be operated by a joystick type operation lever 54. In this case, the left tilt and the right tilt posture are controlled by the operation lever 54. The left and right angles are controlled by the levers in the forward and backward directions of the levers 54, and a control signal corresponding to the blade controller 32 is output with each lever operation. It is set. The operation lever 54 is set to return to the neutral position in the non-operation state. In this case, the inclination amount of the blade 10 is set to change according to the operation amount of the operation lever 54. Have been.
さらに請求項 3のようにすることで、 操作スィツチの操作で補助スプール作動 手段およびパイロット切換えバルブを切換えることができて、 操作性の改善が計 れる。 According to the third aspect of the present invention, the auxiliary spool operating means and the pilot switching valve can be switched by operating the operation switch, thereby improving operability.
産業上の利用可能性 Industrial applicability
そして、 請求項 1のようにすることで、 補助スプール作動手段をオプション用 バルブのスプールに近接状態で配することができて、 ガ夕付きのないスプール作 動手段を行うことができる。 According to the first aspect of the present invention, the auxiliary spool operating means can be arranged in close proximity to the spool of the optional valve, and the spool operating means with no looseness can be performed.
このものにおいて、 請求項 2のようにすることで、 ソレノイ ドおよび油圧シリ ンダ手段のコンパクト配置ができる。 In this case, according to the second aspect, a compact arrangement of the solenoid and the hydraulic cylinder means can be achieved.
また、 請求項 3のようにすることで、 操作スィヅチの操作で補助スプール作動手段 およびパイ口ヅト切換えバルブを切換えることができて、 操作性の改善が計れる。 さらに、 このものにおいて、 本発明の操作スィッチは、 ブレードを昇降動するため の操作レバーの握り部に設けられているものとすることができ、 これによつて、 ブレ ードの上下動、 チルト作動、 アングル作動を一つの操作レバーにまとめることができ 、 操作性がさらに向上する。 According to the third aspect of the present invention, the auxiliary spool actuating means and the pie port switching valve can be switched by operating the operation switch, thereby improving operability. Further, in this device, the operation switch of the present invention can be provided on a grip portion of an operation lever for moving the blade up and down, whereby the blade can be moved up and down and tilted. Operation and angle operation can be combined into one operation lever, and operability is further improved.
さらにまた、 請求項 4のようにすることで、 本発明の操作スィッチを操作したこと による補助スプール作動手段への切換え指令の出力に遅延時間が設定されているもの とすることができ、 チルトーアングルの切換えの際に、 補助スプール作動手段がパイ ロヅト切換えバルブより先に切換わってしまう不具合を回避できる。 Still further, according to the fourth aspect, a delay time can be set for the output of the switching command to the auxiliary spool operating means by operating the operation switch of the present invention. When the angle is switched, it is possible to avoid a problem that the auxiliary spool operating means is switched earlier than the pilot switching valve.
また、 請求項 5のようにすることで、 一つのオプション用バルブからの圧油を、 ブ
レード用セレクタバルブの他にオプション用セレクタバルブへの選択して供給できる さらに請求項 6、 7のようにすることで、 本発明のオプション用バルブとォプ シヨン用セレクタバルブとは、 ォプション用油圧作動機構の作動をすベく操作具 操作した場合に、 オプション用セレクタバルブが切換わってからオプション用バ ルブが切換わるべく制御されているものとすることができる。
In addition, the pressure oil from one optional valve is In addition to the selector valve for the blade, it can be selectively supplied to the selector valve for the option. Further, according to claims 6 and 7, the option valve and the option selector valve of the present invention can be combined with the option hydraulic valve. When the operating tool is operated to operate the operating mechanism, the option valve can be controlled to be switched after the option selector valve is switched.
Claims
1 . 上部旋回体が旋回自在に設けられる下部走行体に、 運転操縦部に配した 操作レバ一の操作で上下昇降作動をするブレードを配すると共に、 油圧ポンプか ら複数の油圧ァクチユエ一夕への圧油供給制御をするための各バルブが集中装備 されるバルブユニットを設け、 該バルブユニットの一側部に、 各バルブスプール を作動させるためのスプール作動手段を対向配設してなる油圧ショベルにおいて 、 前記ブレードにチルト用油圧シリンダ、 アングル用油圧シリンダを設け、 これ ら油圧シリンダへの圧油供給でチルトーアングル姿勢の変姿機能を設けるにあた り、 前記バルブユニットに装備したオプション用バルブをチルト、 アングル用油 圧シリンダに圧油供給するためのバルブとし、 該オプション用バルブのスプール を作動させるための補助スプール作動手段を、 前記スプール作動手段と集中装備 されるバルブュニットとのあいだに配した油圧ショベル。 1. On the lower traveling structure where the upper revolving structure is rotatably provided, a blade that moves up and down by operating the operating lever provided on the operation control unit is arranged, and from the hydraulic pump to a plurality of hydraulic actuators. A hydraulic excavator having a valve unit in which valves for centrally controlling the supply of pressure oil are provided, and spool operating means for operating each valve spool is provided on one side of the valve unit. In the above, the tilt hydraulic cylinder and the angle hydraulic cylinder are provided on the blade, and the tilt oil angle changing function is provided by supplying hydraulic oil to these hydraulic cylinders. The valve is a valve for supplying hydraulic oil to the hydraulic cylinder for tilt and angle, and the spool of the optional valve is operated. Hydraulic excavator auxiliary spool actuation means, arranged in between the Barubuyunitto being concentrated equipped with the spool actuating means for.
2 . 請求項 1において、 補助スプール作動手段は、 ソレノイドと、 該ソレノィ ド の作動により切換えられる油圧シリンダ手段と、 該油圧シリンダ手段を構成するシリ ンダのシリンダロヅドとオプション用バルブのスプールとを連動連結する連結手段と から構成されるものとし、 ソレノイ ドおよび油圧シリンダ手段はスプール作動手段と バルブュニッ卜との対向間に配され、 連結手段はスプール作動手段と平行状に配した 油圧ショベル。 2. The auxiliary spool operating means according to claim 1, wherein the auxiliary spool operating means is an interlocking connection between a solenoid, a hydraulic cylinder means switched by the operation of the solenoid, and a cylinder load of a cylinder constituting the hydraulic cylinder means and a spool of an optional valve. A hydraulic excavator in which the solenoid and the hydraulic cylinder means are disposed between the spool operating means and the valve unit, and the connecting means is disposed in parallel with the spool operating means.
3 . 請求項 1または 2において、 補助スプール作動手段により切換えられるォプ シヨン用バルブからの油路には、 油圧ポンプからの圧油をチルト、 アングル用油圧シ リンダへ供給するためのブレード用セレクタバルブを連結し、 該ブレード用セレクタ バルブには、 ブレード用セレクタバルブを切換えるためのブレード用パイロット切換 えバルブを設け、 前記補助スプール作動手段およびパイロット切換えバルブには、 チ ルト、 アングル作動の選択切換え指令を出力するため操作される操作スィツチが設け られている油圧ショベル。 3. The blade selector for supplying hydraulic oil from the hydraulic pump to the tilt and angle hydraulic cylinders in the oil passage from the option valve switched by the auxiliary spool operating means according to claim 1 or 2. The blade selector valve is provided with a blade pilot switching valve for switching the blade selector valve, and the auxiliary spool operating means and the pilot switching valve are selectively switched between tilt and angle operations. A hydraulic excavator equipped with an operation switch that is operated to output commands.
4 . 請求項 3において、 操作スィッチは、 ブレードを昇降動するための操作レバ —の握り部に設けられている油圧ショベル。 4. The hydraulic excavator according to claim 3, wherein the operation switch is provided on a grip portion of an operation lever for moving the blade up and down.
5 . 請求項 3または 4において、 操作スィッチを操作したことによる補助スプ一
ル作動手段への切換え指令の出力に遅延時間が設定されている油圧ショベル。 5. The auxiliary sprocket according to claim 3 or 4, which is obtained by operating the operation switch. A hydraulic shovel in which a delay time is set in the output of the switching command to the operating means.
6 . 請求項 1、 2、 3、 4または 5において、 前記オプション用バルブからの圧 油を、 チルト、 アングル作動とは別のオプション用油圧作動機構と前記ブレード用セ レクタバルブとに選択的に切換え供給するするためのオプション用セレクタバルブを 設けると共に、 操作具操作に基づいてオプション用セレクタバルブの切換えをするた めの切換え手段とを備えて構成された油圧ショベル。 6. The pressure oil from the option valve according to claim 1, 2, 3, 4 or 5, is selectively switched to an option hydraulic operation mechanism different from tilt and angle operation and to the blade selector valve. A hydraulic shovel comprising: an optional selector valve for supplying; and a switching means for switching the optional selector valve based on operation of an operating tool.
7 . 請求項 6において、 オプション用バルブとオプション用セレクタバルブとは 、 オプション用油圧作動機構の作動をすべく操作具操作した場合に、 オプション用セ レクタノ レブが切換わつてからォプション用バルブが切換わるべく制御されている油 圧ショベル。
7. In claim 6, the optional valve and the optional selector valve are configured such that when the operating tool is operated to operate the optional hydraulic operating mechanism, the optional valve is switched off after the optional selector knob is switched. Hydraulic excavators controlled to replace.
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10197198A JP3410359B2 (en) | 1998-03-30 | 1998-03-30 | Hydraulic control device for construction machinery |
JP10/101971 | 1998-03-30 | ||
JP10/101970 | 1998-03-30 | ||
JP10197098A JP3531903B2 (en) | 1998-03-30 | 1998-03-30 | Small excavator |
JP17480298A JP3420503B2 (en) | 1998-06-22 | 1998-06-22 | Hydraulic excavator |
JP10/174802 | 1998-06-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999050509A1 true WO1999050509A1 (en) | 1999-10-07 |
Family
ID=27309594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1998/004132 WO1999050509A1 (en) | 1998-03-30 | 1998-09-14 | Hydraulic shovel |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO1999050509A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1452650A1 (en) * | 2003-02-27 | 2004-09-01 | CAMS MACCHINE S.r.l. | Revolving blade for small excavators |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63104447U (en) * | 1986-12-24 | 1988-07-06 | ||
JPH04203030A (en) * | 1990-11-30 | 1992-07-23 | Insutaruko:Kk | Piping unit for centralized automatic grease feeding device for construction machine |
JPH08165773A (en) * | 1994-12-14 | 1996-06-25 | Sekisui Chem Co Ltd | End structure of stairs |
-
1998
- 1998-09-14 WO PCT/JP1998/004132 patent/WO1999050509A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63104447U (en) * | 1986-12-24 | 1988-07-06 | ||
JPH04203030A (en) * | 1990-11-30 | 1992-07-23 | Insutaruko:Kk | Piping unit for centralized automatic grease feeding device for construction machine |
JPH08165773A (en) * | 1994-12-14 | 1996-06-25 | Sekisui Chem Co Ltd | End structure of stairs |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1452650A1 (en) * | 2003-02-27 | 2004-09-01 | CAMS MACCHINE S.r.l. | Revolving blade for small excavators |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2255258B1 (en) | Carrier and backhoe control system and method | |
US7036248B2 (en) | Pattern select valve for control levers of a title work vehicle | |
US7730646B2 (en) | Swivel work machine | |
JPH0221605B2 (en) | ||
KR102032404B1 (en) | Construction machinery | |
US5235811A (en) | Control change system for a hydraulic work vehicle | |
JP3420503B2 (en) | Hydraulic excavator | |
WO1999050509A1 (en) | Hydraulic shovel | |
JP6770013B2 (en) | Demolition machine with clamp arm | |
JP3410359B2 (en) | Hydraulic control device for construction machinery | |
WO2022131376A1 (en) | Construction machine | |
JP3531903B2 (en) | Small excavator | |
JP7094679B2 (en) | Work vehicle | |
JP4469186B2 (en) | Work machine | |
JP2002038534A (en) | Operation change-over control circuit for a plurality of actuators retrofitted in multi-functional excavator | |
JP3833163B2 (en) | Fluid pressure circuit in work machines | |
JP2742682B2 (en) | Work lever operation lever structure | |
JP2742681B2 (en) | Work lever operation lever structure | |
JP4521866B2 (en) | Hydraulic control equipment for construction machinery | |
JPH0732901A (en) | Traveling operation device for construction machine | |
JPH0627408B2 (en) | Operating device for radio control type excavator | |
JP2555889Y2 (en) | Hydraulic operation structure of backhoe | |
JPS63171930A (en) | Operating lever structure of working machine | |
JP2000265497A (en) | Operational drive device for two-piece boom type working machinery | |
JP2002097675A (en) | Travel operation regulating device for work vehicle |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
122 | Ep: pct application non-entry in european phase |