JP3243127B2 - Swing type work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking type work vehicle which is suitable for mowing work on slopes such as a bank of a riverbed or a mountainous area or a ski resort.

[0002]

2. Description of the Related Art Conventionally, a rocking type work vehicle disclosed in U.S. Pat. No. 3,728,909 has been known as a rocking type work vehicle for mowing work on a slope. In this swing type work vehicle, one HST (hydrostatic continuously variable transmission) composed of one hydraulic pump and one hydraulic motor is attached to each side wall of the reduction case, and one HST (hydrostatic stepless transmission) is mounted on each side wall of the reduction case. 2P with an axle shaft that directly transmits power from the wall to the sprockets of the left and right traveling device
(Pump) / 2M (motor) HST.

[0003]

However, in the conventional apparatus described above, the HST is rigidly fixed, and the pipe connecting the hydraulic pump and the hydraulic motor is not flexible. There was a problem that the range of use of the traveling section was limited.

[0004] Conventionally, a hydraulic pump and a hydraulic motor directly attached to a lawn mowing frame are connected by a 2P pipe.
U.S. Pat.
The one disclosed in Japanese Patent No. 20733 is known.
However, this conventional device does not swing in response to an inclined surface, but relates to an operating device of a walking lawn mower.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to increase the strength, rigidity and stability of an oscillating body,
An object of the present invention is to provide an oscillating work vehicle having a simplified configuration of a transmission device for transmitting power to a traveling device.

[0006]

According to a first aspect of the present invention, there is provided an oscillating work vehicle, comprising: a traveling device provided on left and right portions of a traveling vehicle body; An axis of a support shaft along the front-rear direction of the traveling vehicle body is located at a substantially middle portion in the left-right direction of the traveling vehicle body, and supports the swinging vehicle body so as to be swingable in the left-right direction about the support shaft. A driving device for driving, a hydraulic pressure generator fixed to the rocking vehicle body and a prime mover for driving the hydraulic pressure generation device ,
; And a right and left hydraulic motor connected to the drive shaft of the traveling device of the lateral portion is fixed to the vehicle body, said hydraulic pressure generating
Apparatus, and two lateral traction pump, a charge pump for HST (hydrostatic continuously variable device), Ri consists a working machine vertically / swinging body swinging pump, the rotation axis of the traction pump the The rotating shaft of the HST charge pump and the rotating shaft of the work machine vertical / swinging body swing pump are connected to each other so as to be able to rotate in conjunction with each other, and the rotation shaft of the supporting shaft of the swinging body is centered on one side. the travel pump and the HST charge pump and said working machine vertically / swinging body swinging pump disposed respectively, each arranged engine and hydraulic oil tank on the other side, the before and Symbol oil pressure generator An engine is connected so as to transmit power, and the hydraulic motor and the hydraulic pressure generating device are connected via a flexible pipe. Also,
Oscillating type work according to claim 2 of the present invention to achieve the object.
The industrial vehicle is the rocking work vehicle according to claim 1,
That the hydraulic oil tank is mounted on the rocking body
It is a feature. Furthermore, in order to achieve the above purpose
The oscillating work vehicle according to claim 3 of the present invention is characterized by claim 1
The swing-type work vehicle according to claim 1, wherein the traveling vehicle body and the swing
It moves between the moving body and the vehicle by hydraulic pressure from the hydraulic pressure generator.
A double-acting hydraulic cylinder is
The swing angle of the swing body can be adjusted.
It is a sign.

In order to achieve the same object, a hydraulic oil tank is mounted on the oscillating body, or a double-acting type operated by hydraulic pressure from the hydraulic pump between the traveling body and the oscillating body. It is preferable that the hydraulic cylinder is provided and the swing angle of the swing vehicle body can be adjusted by the hydraulic cylinder.

[0008]

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view showing a configuration of an oscillating work vehicle according to a first embodiment of the present invention, FIG. 2 is a plan view showing the configuration of the oscillating work vehicle, and FIG.
FIG. 3 is a partially cutaway plan view showing a main part of FIG. 2. 1 and 2
In the drawing, reference numeral 1 denotes a traveling vehicle body having a flat rectangular frame shape, and traveling devices 2 are provided on left and right portions thereof, respectively. The traveling devices 2 have the same configuration, and include a plurality of guide rollers 3 rotatably disposed on the lower surfaces of the left and right portions of the traveling vehicle body 1 and one guide roller 3 disposed rotatably on the front left and right portions of the traveling vehicle body 1. , A single sprocket 5 rotatably disposed at the rear left and right of the traveling vehicle body 1, and a crawler 6 rotated by the guide roller 3, the tension roller 4, and the sprocket 5. The tension roller 4 is mounted movably in the front-rear direction with respect to the traveling vehicle body 1, and is urged forward by a spring 7 to apply a predetermined tension to the crawler 6. Sprocket 5
The right and left hydraulic motors 9 mounted on brackets 8 projecting from the rear left and right of the traveling vehicle body 1 are fixed to rotating shafts 10 thereof. The left and right hydraulic motors 9 rotate the right and left crawlers 6 via the right and left sprockets 5 so that the traveling vehicle body 1 travels.

A work implement 11 is disposed at the front of the traveling vehicle body 1 so as to be able to move up and down (turn freely in the vertical direction). The work machine 11 performs mowing work.
A first rotating shaft 13 rotatably supported inside the cover 12 with an axis thereof oriented in the left-right direction;
A plurality of hammer knives 14 for mowing are mounted radially on the outer periphery of the first rotary shaft 13 and evenly to both ends of the first rotary shaft 13, and a front mounted on a front portion of the cover 12 so as to be rotatable in a vertical direction. And a protector 15. One end of a support arm 16 is fixed to the rear left and right of the cover 12, and the other end of the support arm 16 is rotatably attached to a bracket 17 protruding from the front upper surface of the traveling vehicle body 1 via a shaft 18. Have been. Then, the entire work machine 11 rotates vertically about the shaft 18.

The front protector 15 is for opening and closing the front opening of the cover 12.
2 is rotatably attached to the cover 12 so as to be rotatably attached to the left and right portions. One end of a coil spring 20 is rotatably attached to the left and right portions of the front protector 15, and the other end of the coil spring 20 is rotatably attached to the left and right portions of the cover 12. These coil springs 20 are located above the turning arm 19 in FIG. 1, and the front protector 15 is turned by the coil springs 20 in the closing direction (counterclockwise in FIG. 1). Further, the front protector 15 has an upper edge 15a formed at the front upper edge 1 of the cover 12.
By contacting the cover 2a, as shown in FIG.
The front opening 2 is held at a rotation limit position in the closing direction where the amount of opening of the front opening is minimized.

Then, the front protector 15 is rotated according to the height of the grass to be cut, and the opening amount of the front opening of the cover 12 is controlled. That is, when the height of the grass is relatively low, the front protector 15 is in the state shown in the drawing, and the opening amount of the front opening of the cover 12 is kept to a minimum. Prevent jumping out. When the height of the grass is high, the front protector 15 is pushed up by the grass, so that the front protector 15 tilts around the fulcrums A, B, and C against the urging force of the coil spring 20. By rotating so as to slide along the surface 12b, the opening amount of the front opening of the cover 12 is increased, and a large amount of grass can be taken in from the front opening of the cover 12. It can respond to any grass height, allowing a wide range of work. That is, the fulcrum A rotates only, the fulcrum B vertically rotates with respect to the rotation and the fulcrum A, and the fulcrum C slides along the inclined surface 12a.

A V pulley 21 is fixed to one end of the rotating shaft 13. The V-pulley 21 is fixed to one end of a second rotating shaft 22 that is rotatably mounted on the rear upper portion of the cover 12 in parallel with the first rotating shaft 13.
Are connected via an endless V-belt 24 so as to be able to transmit power. A V pulley 25 is fixed to the other end of the second rotation shaft 22. The V pulley 25 is connected to a V pulley 28 fixed to an output shaft 27 of a gear reduction mechanism 26 fixed to a front central upper surface of the traveling vehicle body 1 via an endless V belt 29 so as to be able to transmit power. The axis L of the input shaft 30 of the gear reduction mechanism 26 is located substantially at the center of the traveling vehicle body 1 in the left-right direction. The input shaft 30 has a V pulley 5 described later.
8, 55, 56, 60 and endless V-belts 59, 61 are connected to the drive source 48 so as to be able to transmit power. Then, the power of the driving source 48 is supplied to the V pulleys 58, 55, 56,
60 and the endless V-belts 59 and 61 through the gear reduction mechanism 2
6, the rotation of the input shaft 30 is transmitted to the output shaft 27, and the rotation of the output shaft 27 is transmitted to the V-pulley 2
8, endless V-belt 29, V-pulley 25, second rotating shaft 2
2, transmitted to the first rotating shaft 13 via the V pulley 23, the endless V-belt 24, and the V pulley 21 in this order.
By the rotation of the hammer knife 14 together with 3,
Mowing work is performed.

The work machine 11 is moved up and down by a double-acting lift cylinder 31. The lift cylinder 31 is
A lower end of the cylinder body 31a is rotatably mounted via a shaft 34 on a bracket 33 which is rotatably mounted in a vertical direction via a shaft 32 at a substantially central portion of a front portion of the traveling vehicle body 1. The piston rod 31b of the lift cylinder 31 is rotatably mounted via a shaft 35 to a bracket 89 mounted at a substantially central portion in the left-right direction of the cover 12. When the piston rod 31b of the lift cylinder 31 is in the retracted state as shown in FIG. 1, the work implement 11 is at the lowest position, and at this time, the rear end 33a of the bracket 33 is The contact with the front part of the work 1 prevents the work implement 11 from rotating downward. When the piston rod 31b of the lift cylinder 31 projects from this state, the work implement 11 rotates upward (clockwise in FIG. 1) about the shaft 18.

A swinging body 36 is supported on the traveling body 1 so as to swing left and right. The oscillating body 36 has a box shape of a plane quadrangle, and as shown in FIGS. 1 and 2,
The bearing 37 at the lower center of the front side is a plain bush 38
And is rotatably supported on the input shaft 30 of the gear reduction mechanism 26 through the shaft. Therefore, the input shaft 30 of the gear reduction mechanism 26
Serves both as a drive shaft for rotationally driving the hammer knife 14 of the work machine 11 and a support shaft for swingably supporting the swinging vehicle body 36 with respect to the traveling vehicle body 1. Thereby unnecessary extra support shaft, achieving reduction in the number of parts
Can be . As shown in FIGS. 1 and 3, a support shaft 39 is protruded from the center of the rear lower portion of the swinging vehicle body 36. The support shaft 39 is rotatably supported via a plain bush 42 on a bearing 41 attached to a bracket 40 projecting from the rear central upper surface of the running vehicle body 1. The axis L of the support shaft 39 matches the axis L of the input shaft 30 of the gear reduction mechanism 26. The swinging vehicle body 36 is located at a substantially middle portion in the left-right direction of the traveling vehicle body 1 with respect to the traveling vehicle body 1 and is centered on the axis L of the input shaft 30 and the support shaft 39 along the front-rear direction of the traveling vehicle body 1. Swings right and left. As shown in FIG. 1, the lower end surface 36 a of the swinging vehicle body 36 is
Is set below the upper end surface 6a of the crawler 6. This further lowers the center of gravity of the entire vehicle body and increases stability.

The swing angle of the swing body 36 is adjusted by a swing cylinder 43. This swing cylinder 4
3 is a bracket 4 projecting from a position where the lower end of the cylinder main body 43a is deviated to the left on the rear upper surface of the traveling vehicle body 1.
As shown in FIG. 4 and FIG. The outer end of the piston rod 43b of the swing cylinder 43 is
6 Bracket fixed in place at the rear (not shown)
Is rotatably mounted via a shaft 46. Then, as shown in FIG. 5, the entire swing body 36 swings right and left around the input shaft 30 and the support shaft 39 in accordance with the reciprocating operation of the piston rod 43b of the swing cylinder 43, and the swing angle becomes Adjusted.

The drive unit 4 is mounted on the upper surface of the bottom of the swinging vehicle body 36.
7 is fixed. The driving device 47 is a driving device 2
And the work implement 11 and the swinging vehicle body 36 are driven and moved. The driving device 47 includes an engine (motor) 48 as a driving source and the power of the engine 48 for the traveling device 2.
Transmission 49 for transmitting power to work machine 11 and swinging body 36
Consists of As shown in FIG. 2, the engine 48 and the transmission 49 are disposed on the left and right sides of the axis L of the support shaft 39 of the swing body 36, and the engine 48 is disposed on the left side of the axis L, and the transmission 49 is disposed on the left. It is located on the right side of the axis L. As a result, the balance of the swinging vehicle body 36 is improved, and the entire vehicle is stabilized. Also, an electric motor can be considered as the drive source.

The transmission 49 has a hydraulic pressure generator 50. This hydraulic pressure generating device 50 is composed of two traveling hydraulic pumps 51, 51 each composed of a variable swash plate type axial piston pump that generates a hydraulic pressure for driving the left and right traveling devices 2.
And one charge pump 52 and one work machine vertical / swinging body swing pump 53 composed of a gear pump. The rotation shafts of the pumps 51 to 53 are connected to each other so as to be able to rotate freely. A power transmission shaft 54 is connected to a rotating shaft (not shown) of the traveling hydraulic pump 51 (the front in FIG. 2). The transmission shaft (not shown) of the power transmission shaft portion 54 has two (integrated with each other)
V pulleys 55 and 56 are fixed. One V-pulley 55 is connected to a V-pulley 58 fixed to an output shaft 57 of the engine 48 via an endless V-belt 59 so as to be able to transmit power. The other V-pulley 56 is connected to a V-pulley 60 fixed to the input shaft 30 of the gear reduction mechanism 26 via an endless V-belt 61 so that power can be transmitted.

The rotational force of the output shaft 57 of the engine 48 is controlled by the V pulley 58, the endless V belt 59, and the V pulley 5.
5. One traveling hydraulic pump 5 via the power transmission shaft 54
1, the other traveling hydraulic pump 51, the charge pump 52
The pump 51 is transmitted to the work machine vertical / swinging body swing pump 53, and these pumps 51 to 53 rotate to generate hydraulic pressure.

The rotational force of the output shaft 57 of the engine 48 is controlled by the V pulley 58, the endless V belt 59, the V pulley 55,
The power is transmitted to the input shaft 30 of the gear reduction mechanism 26 via the power transmission shaft 54, the V pulley 56, the endless V belt 61, and the V pulley 60, and the input shaft 30 rotates.

A pilot mounting table 62 is provided at a substantially middle position in the left-right direction and at a substantially middle position in the vertical direction at the rear of the swinging vehicle body 36. The operator mounting table 62 has a seat 62b on which the operator 63 sits mounted on the rear upper surface of a step plate 62a on which the operator (see FIG. 5) 63 places his or her feet.
A fuel tank 86 for the engine 48 is provided below the seat 62b. An operation panel 64 is provided on the rear upper surface of the swinging vehicle body 36. As shown in FIG. 4, the operation panel 64 includes a work implement on / off lever 65 for turning on / off the rotation of the hammer knife 14 of the work implement 11, switching of the lifting / lowering (up / down) operation of the work implement 11, and the swinging body 36. Work machine vertical / swinging body swing lever 66 for adjusting the swinging angle of the traveling device 2 to the left and right,
An HST operation lever 67 for reversing and turning left and right and a throttle lever 68 for adjusting the throttle opening of the engine 48 are provided. The work implement on / off lever 65 and the throttle lever 68 are provided movably in the vertical direction (the directions of arrows A and B in FIG. 4). Also, the working machine up / down / swinging body swing lever 66
Are provided so as to be movable in a vertical direction (directions of arrows A and B in FIG. 4) and a horizontal direction (directions of arrows C and D in FIG. 4) around the neutral position. Furthermore, HS
The T operation lever 67 is moved up and down (arrows A and
B direction) and left and right direction (arrow C and D directions in FIG. 4)
It is provided movably. Each of the levers 65 to 68 is operated by the operator 63 on the operator mounting table 62. The operation panel 64 includes an engine 48.
A starter switch (not shown) for starting the motor is provided. Further, a support base 85 on the front side of the operation panel 64 is provided.
A battery 85 is mounted on a.

There is a merit that the HST operation lever 67 can be operated with one hand and the levers 65, 66, 68 can be simultaneously operated with the other hand, so that the steering performance is improved and the fatigue of the operator is minimized.

When the working machine on / off lever 65 is operated to move in the on direction, the tension roller 69 shown in FIGS. 1 and 2 moves the V pulley 25 at the other end of the second rotary shaft 22 and the output shaft 27 of the gear reduction mechanism 26. When the endless V-belt 29 between the V-pulley 28 is pressed upward, tension is applied to the endless V-belt 29, and the power is transmitted (on), so that the hammer knife 14 rotates. When the work implement on / off lever 65 is moved in the off direction, the upward pressing of the endless V-belt 29 by the tension roller 69 is released, and the tension on the endless V-belt 29 is released. 29 slips and power is not transmitted (off), and the hammer knife 14 does not rotate.

The HST operating lever 67 is locked in its neutral position when it is in the neutral state, and the locked state is released by pulling the lock release lever 67a upward in FIG. 4 from this locked state, and the HST operating lever 67 is operated. The vehicle has the advantage of being able to perform left and right turning operations in the locked state, and to be able to make left and right super turning operations centering on the center of the entire vehicle.

As shown in FIGS. 1 and 2, an oil tank 70 is fixed on the upper surface of the oscillating body 36 in parallel with the engine 48. The oil tank 70 is mounted on the swinging vehicle body 36.
Engine 48 about the axis L of the support shafts 30, 39 of the engine 48
And the rear side of the engine 48. Thereby, the space of the swinging vehicle body 36 is effectively used.

FIG. 6 is a hydraulic circuit diagram of the swing type working vehicle of the present invention. In the figure, reference numeral 71 denotes a first switching valve for switching the working machine up and down, and reference numeral 72 denotes a second switching valve for switching the right and left swing of the swinging body 36. Each of these switching valves 71 and 72 is a 6-port, 3-position spool valve of a manual switching type.
Is switched by the operation of. The first port 71a of the first switching valve 71 and the first port 72a of the second switching valve 72
It is connected to the discharge port of the work machine vertical / swinging body swing pump 53. The second port 71b of the first switching valve 71 and the second port 72b of the second switching valve 72 are connected to the inflow port (return port) of the oil tank 70. The third and fourth ports 71c, 71d of the first switching valve 71 are connected to hydraulic chambers 73a, 73a in the cylinder body 31a of the lift cylinder 31.
73b. The third and fourth ports 72c, 72d of the second switching valve 72 are connected to hydraulic chambers 74a, 74b in the cylinder body 43a of the swing cylinder 43.

The swash plate of each traveling hydraulic pump 51 can be set to neutral, forward, backward, and left / right turning by controlling the swash plate by operating the HST operating lever 67 on the operation panel 64.

The oil flow ports 51a and 51b of the traveling hydraulic pump 51 are connected to the oil flow ports 9b and 9a of the left hydraulic motor 9 via flexible pipes 75a and 75b. The oil flow ports 51a and 51b of the other traveling hydraulic pump 51 are connected to flexible pipes 76a and 7b.
6b, an oil circulation port 9a of the right hydraulic motor 9 is provided.
9b. Further, the discharge port of the charge pump 52 is connected to the oil circulation port 5 of both the traveling hydraulic pumps 51.
1a and 51b. The suction port of the work machine vertical / swinging body swing pump 53 and the suction port of the charge pump 52 are connected to the outlet of the oil tank 70 via a flexible pipe 77a.

In FIG. 6, 78 is a check valve interposed in a predetermined pipe, 79 is a relief valve interposed in a predetermined pipe,
80 denotes a fourth port 71d of the first switching valve 71 and the other hydraulic chamber 73 in the cylinder body 31a of the lift cylinder 31.
Orifices 81 interposed in the pipeline between b and b are filters provided at the inlet and outlet of the oil tank 70, respectively.

Next, the operation of the swing type work vehicle of the present embodiment having the above-described structure will be described.

"Running operation" The engine 48 is started by operating a starter switch, and the throttle lever 68 is operated to adjust the rotational speed of the engine 48. Then, the pumps 51 to 53 are rotated by the driving of the engine 48, and hydraulic pressure is generated. In this state, the lock state of the neutral position of the HST operation lever 67 is released by pulling up the lock release lever 67a.
When the HST operation lever 67 is moved in the direction of arrow A in FIG. 4, the discharge pressures of the traveling pumps 51 of the left and right traveling devices 2 are sent to the hydraulic motor 9 in a state where they are equal to each other. By rotating forward (counterclockwise in FIG. 1) and rotating the right and left crawlers 6 forward,
The entire swinging work vehicle moves forward. Further, when the lock release lever 67a is pulled up and the HST operation lever 67 is moved in the direction of arrow B in FIG. 4, the discharge pressures of the traveling pumps 51 of the left and right traveling devices 2 are sent to the hydraulic motor 9 in a state where they are equal to each other. The left and right hydraulic motors 9 reversely rotate at an equal rotational speed to each other (clockwise in FIG. 1), and the right and left crawlers 6 reversely rotate at an equal rotational speed. I do.

When the HST operating lever 67 moving in the direction of arrow A in FIG. 4 is rotated to the left (in the direction of arrow C in FIG. 4), the discharge pressure of the left traveling pump 51 is reduced.
1, the rotation speed of the left hydraulic motor 9 becomes lower than the rotation speed of the right hydraulic motor 9 or the reverse rotation speed becomes low, and the left crawler 6 becomes the right crawler 6.
Since the work vehicle rotates (or stops or reverses) at a lower rotation speed, the entire swingable work vehicle makes a forward left turn. FIG.
When the HST operation lever 67 moving in the direction of arrow A is rotated to the right (the direction of arrow D in FIG. 4), the discharge pressure of the right traveling pump 51 becomes lower than the discharge pressure of the left traveling pump 51? The rotation speed of the right hydraulic motor 9 becomes lower than the rotation speed of the left hydraulic motor 9, and the right crawler 6 rotates (or stops or reverses) at a lower rotation speed than the left crawler 6. The entire dynamic work vehicle makes a forward right turn.

When the HST operation lever 67 moving in the direction of arrow B in FIG. 4 is turned to the left (in the direction of arrow C in FIG. 4), the oil discharge pressure is opposite to that in the case of forward turning, and the left crawler 6 is rotated.
, The rotation speed of the right crawler 6 decreases (or stops or rotates forward), so that the entire vehicle turns backward and turns right. When the HST operation lever 67 moving in the direction of arrow B in FIG. 4 is turned to the right (the direction of arrow D in FIG. 4),
Since the oil discharge pressure is again opposite to that in the case of forward turning, the rotational speed of the right crawler 6 increases, and the rotational speed of the left crawler 6 decreases (or stops or rotates forward). Turn.

When the HST operation lever 67 is set to the neutral position, the discharge pressures of the left and right traveling pumps 51 become zero, so that the left and right hydraulic motors 9 do not rotate, and accordingly the right and left crawlers 6 do not rotate. The entire swing type work vehicle is stopped. When the HST operation lever 67 is turned to the left or right in the neutral position, the HST operation lever is turned around the substantially center of the entire vehicle in the same direction as the turned direction. That is, in the case of a left turn, the right hydraulic motor 9 rotates in the reverse direction and the left hydraulic motor 9 rotates in the normal direction.

Since such operations can be performed, smooth straight running, turning, and sharp turning can be performed, and the operator can operate with one hand with one lever, so that the operator does not get tired.
In addition, another operation can be performed with the other hand.

"On / off operation of work machine"
When the off lever 65 is turned on, the tension roller 69
Presses the endless V-belt 29 between the V-pulley 25 at the other end of the second rotary shaft 22 and the V-pulley 28 of the output shaft 27 of the gear reduction mechanism 26 upward, so that the endless V-belt 29
State where tension is applied and power is transmitted (ON)
As a result, the hammer knife 14 rotates. The rotating hammer knife 14 cuts the grass. Also, when the work implement on / off lever 65 is moved in the off direction,
The upward pressing of the endless V-belt 29 by the tension roller 69 is released, and the tension on the endless V-belt 29 is released, so that the endless V-belt 29 slips and power is not transmitted (off), and the hammer is turned off. Knife 14 does not rotate.

When the work machine vertical / swinging body swing lever 66 is moved upward (in the direction of arrow A in FIG. 4), the first switching valve 71 is switched to the first position.
One hydraulic chamber 73a of the cylinder body 31a of the lift cylinder 31 is communicated with the inflow port of the oil tank 70 via the third port 71c and the second port 71b of the first switching valve 71, and the other hydraulic chamber 73b is The first switching valve 71 is connected to a discharge port of a work machine vertical / swinging body swing pump 53 via a first port 71a and a fourth port 71d. Accordingly, oil flows into the other hydraulic chamber 73b, and the piston rod 31b of the lift cylinder 31 moves to the right in FIG. When the work implement vertical / swinging body swing lever 66 is moved downward (in the direction of arrow B in FIG. 4), the first switching valve 71 is switched to the second position, and one of the cylinder bodies 31a of the lift cylinder 31 is moved. Of the first switching valve 71
The first hydraulic pressure chamber 73b is connected to the discharge port of the work machine vertical / swinging vehicle swing pump 53 through the first port 71a and the third port 71c, and the other hydraulic chamber 73b is connected to the fourth port 71d of the first switching valve 71 and the fourth port 71d. The oil tank 70 is communicated with the inflow port of the oil tank 70 via the two ports 71b. Therefore, since the piston rod 31b of the lift cylinder 31 moves to the left in FIG. 6, the work implement 11 descends. And work machine 1
When 1 comes into contact with the ground and receives a reaction force upward from the ground, both the bracket 33 and the lift cylinder 31 rotate upward about the shaft 32.

"Rolling operation of rocking vehicle body" When mowing a flat ground, the work machine up / down / rocking vehicle swing lever 66
5 (a) by setting to a neutral position.
As shown in FIG. 7, the swinging vehicle body 36 and the traveling vehicle body 1 are in a state of being parallel to each other.

When mowing an inclined ground, the work machine up / down / swinging body swing lever 66 is moved in the left-right direction according to the inclination direction and the inclination angle. For example, as shown in FIG. 5B, in the case of a slope that rises to the right with respect to the traveling direction of the traveling vehicle body 1, when the work implement vertical / swinging body swing lever 66 is moved rightward, the second switching valve 72 is moved. Switches to the second position, and the cylinder body 43a of the swing cylinder 43
The other hydraulic chamber 74b is connected to the oil tank 70 via the fourth port 72d and the second port 72b of the second switching valve 72.
And the oil is returned to the oil tank 70, and one hydraulic chamber 74a is used for working machine vertical / swinging body swing through the first port 72a and the third port 72c of the second switching valve 72. The discharge oil of the pump 53 is communicated with the discharge port of the pump 53, and flows into one hydraulic chamber 74 a of the swing cylinder 43. Therefore, since the piston rod 43b of the swing cylinder 43 moves rightward (extends) in FIG. 6, the swinging vehicle body 36 moves clockwise in FIG. 5 around the input shaft 30 and the support shaft 39 as viewed from the rear. To rotate. Also, contrary to FIG.
In the case of a sloping ground that rises to the left with respect to the traveling direction of the traveling vehicle body 1, when the work implement vertical / swinging body swing lever 66 is moved to the left, the first switching valve 72 is switched to the first position, and the swing cylinder is rotated. The other hydraulic chamber 74 b of the cylinder body 43 a of the first valve 43 is connected to the first port 72 of the second switching valve 72.
a and the fourth port 72d, is connected to the discharge port of the work machine vertical / swinging body swing pump 53, and the pump 5
The oil discharged from the third cylinder 3 flows into the other hydraulic chamber 74b of the swing cylinder 43, and the one hydraulic chamber 74a flows through the oil tank 70 via the third port 72c and the second port 72b of the second switching valve 72. The oil is communicated with the inlet and returned to the oil tank 70. Therefore, the swing cylinder 4
Since the third piston rod 43b moves to the left in FIG. 6, the swinging vehicle body 36 rotates around the input shaft 30 and the support shaft 39 in FIG. In this way, by moving the work implement up / down / swinging body swing lever 66 in the left-right direction according to the inclination direction and the inclination angle of the sloped ground, the swinging body so that the pilot mounting table 62 is always substantially horizontal. 36 is controlled to swing.

When the swinging body 36 becomes substantially horizontal on this slope and the user releases his hand from the work machine vertical / swinging body swing lever 66, the spring (shown in FIG. The work implement vertical / swinging body swing lever 66 returns to the neutral position. That is, the second switching valve 72 switches to the third position between the first and second positions, and the first, second, third, and fourth ports 72a, 7
2b, 72c, and 72d are closed, the fifth port 72e and the sixth port 72f communicate with each other, and the discharge oil of the work machine vertical / swinging body swing pump 53 is supplied to the fifth and sixth ports 72.
e, and 72f to return to the oil tank 70. In this state, the swing cylinder 43 stops.

As described above, since the swinging body 36 is controlled to swing so as to always keep substantially horizontal, the swinging body 3 is controlled.
The oil level of the prime mover mounted on the motor 6, that is, the fuel tank 86 of the engine 48 and the oil tank 70 for the hydraulic system can be kept substantially horizontal at all times, and the drive system operates stably and the durability is improved.

[Operation of Front Protector] The front protector 15 rotates according to the height of the grass to be cut, and the opening amount of the front opening of the cover 12 is controlled. That is, when the grass height is relatively low, the front protector 1
Reference numeral 5 denotes the state shown in FIG. 1, in which the opening amount of the front opening of the cover 12 is kept to a minimum state, and stones and the like are prevented from jumping forward from the front opening of the cover 12. If the grass to be cut is high, the front protector 1
5 is pushed up by the grass, and pivots so as to slide along the inclined surface 12b at the front portion of the cover 12 around the fulcrums A, B, and C against the urging force of the coil spring 20. Therefore, the opening amount of the front opening of the cover 12 becomes large, and it becomes possible to take in multiple grasses from the front opening of the cover 12.

By providing such a front protector 15, the cover 1 can be used when mowing short grass.
The stone can be prevented from jumping from the front opening of No. 2 and is safe.

Further, since the support shaft at the front part of the swinging vehicle body 36 is the drive shaft 30 of the work machine 11, there is no need to provide them separately, and it is possible to reduce the number of components and reduce the weight.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the basic structure of the swing type work vehicle is the first structure described above.
Since the configuration is the same as that of the embodiment, the description will be made with reference to FIGS. 1 to 5. FIG. 7 is a hydraulic circuit diagram of an oscillating work vehicle according to a second embodiment of the present invention. In FIG. 7, the same parts as those in FIG. is there. 7 differs from FIG. 6 in that the first and second switching valves 71 and 72 of FIG. 6 are replaced with first and second switching ports 71 and 72 of electromagnetic switching type 6-port three-position type spool valves. Mercury sensors (angle sensors) 8 that provide switching valves 71 ′ and 72 ′ and detect the swing angle of the swing body 36.
2,83 are provided. The first changeover valve 71 'is switched by a changeover (on / off) switch 84. The changeover switch 84 replaces the work implement up / down / swinging body swing lever 66 in the first embodiment with an operation panel 64. At a predetermined position.

The first terminal 82a of one mercury sensor 82
Is connected to a connection terminal of an electromagnetic solenoid at one end of a second switching valve 72 ', and a first terminal 83a of the other mercury sensor 83 is connected to a connection terminal of an electromagnetic solenoid at the other end of the second switching valve 72'. Have been. In addition, mercury sensors 82 and 83
Are connected to the (+) terminal of the battery 85.
The terminal 85a is connected to the terminal 85a, and the (-) terminal 85b of the battery 85 is grounded. Mercury sensor 8
2, 83 are positions where the influence of vibration of the swinging vehicle body 36 is small,
That is, as shown in FIG.
4a, and as shown in FIG.
Are arranged on the rocking axis L of each other and are arranged in front of and behind each other. One mercury sensor 82 is located on the front side of the other mercury sensor 83. By arranging the mercury sensors 82 and 83 in this way, the mercury sensor 8
Since 2, 83 are not affected by vibration, the detection operation is reliably performed.

When both of the mercury sensors 82 and 83 are turned on for some reason, the signal from the mercury sensor which is turned on first is given priority, and the mercury which is turned on later is given priority. A safety circuit (not shown) is installed so that the signal from the sensor is canceled. This prevents malfunction.

Next, the operation of the swing type work vehicle according to the present embodiment having the above-described configuration will be described.

"Rolling operation of swinging body" swinging body 3
6 is horizontal, both mercury sensors 82, 83
Are in the off state. And, for example,
As shown in FIG. 5 (b), in the case of a slope that rises to the right with respect to the traveling direction of the traveling vehicle body 1, the swinging vehicle body 36 inclines to the right and only one of the mercury sensors 82 is turned on. The second switching valve 72 'is switched to the second position, and the other hydraulic chamber 74b of the cylinder body 43a of the swing cylinder 43 is connected to the oil tank via the fourth port 72d and the second port 72b of the second switching valve 72'. The oil is returned to the oil tank 70, and the one hydraulic chamber 74a is connected to the working machine up / down / swinging body via the first port 72a and the third port 72c of the second switching valve 72 '. The discharge oil of the pump 53 is communicated with the discharge port of the swing pump 53, and the oil discharged from the pump 53 is supplied to one hydraulic chamber 7 of the swing cylinder 43.
4a. Therefore, since the piston rod 43b of the swing cylinder 43 moves rightward (extends) in FIG. 7, the swinging vehicle body 36 moves clockwise in FIG. 5 around the input shaft 30 and the support shaft 39 as viewed from the rear. When the one mercury sensor 82 is turned off while the other mercury sensor 83 is kept off, the current is cut off for the first time, and the second switching valve 72 'is switched between the first and second positions. It is returned to the third position located in the middle by neutral biasing springs 87, 88 mounted on the left and right solenoids,
The fifth port 72e and the sixth port 72f communicate with the inlet of the oil tank 70, and the swing cylinder 4
3 is stopped, and the horizontal state is maintained. On the other hand, in the case of a sloping land rising leftward with respect to the traveling direction of the traveling vehicle body 1, only the other mercury sensor 83 is turned on, and the second switching valve 72 'is moved to the first position. Switches to
The other hydraulic chamber 74b of the cylinder body 43a of the swing cylinder 43 is connected to the first port 72a of the second switching valve 72 '.
And a discharge port of a working machine vertical / swinging body swing pump 53 through a fourth port 72d.
Is discharged into the other hydraulic chamber 74b of the swing cylinder 43, and the one hydraulic chamber 74a flows into the oil tank 70 via the third port 72c and the second port 72b of the second switching valve 72 '. The oil is communicated with the inlet, and the oil is returned to the oil tank 70. Accordingly, since the piston rod 43b of the swing cylinder 43 moves to the left in FIG. 7, the swinging body 36 rotates counterclockwise around the input shaft 30 and the support shaft 39 in FIG. While one mercury sensor 82 maintains the off state,
When the other mercury sensor 83 is turned off, the current is interrupted for the first time, and the second switching valve 72 'is set at the third position located between the first and second positions at the neutral position mounted on the left and right solenoids. It is returned by the urging springs 87 and 88, communicates with the inflow port of the oil tank 70 via the fifth port 72e and the sixth port 72f, the swing cylinder 43 is stopped, and the horizontal state is maintained. In this way, the mercury sensors 82 and 83 are turned on / off in accordance with the inclination direction and the inclination angle of the sloped land, so that the swinging vehicle body 36 is automatically moved so that the pilot mounting table 62 is always substantially horizontal. The swing is controlled.

As described above, since the swinging body 36 is automatically controlled so as to always maintain a substantially horizontal state, the swinging body 36 is controlled manually by the operator in comparison with the first embodiment. As a result, the number of operations required by the operator can be simplified, and work stability can be further improved.

When the "working machine lifting / lowering operation" switch 84 is switched to the down position, the first switching valve 71 'is switched to the first position, and the cylinder body 31 of the lifting cylinder 31 is moved.
One hydraulic chamber 73a is communicated with the inlet of the oil tank 70 via the third port 71c and the second port 71b of the first switching valve 71 ', and the other hydraulic chamber 73b is connected to the first hydraulic chamber 73b.
First port 71a and fourth port 71d of switching valve 71 '
Through the outlet of the work machine vertical / swinging body swing pump 53. Accordingly, since the piston rod 31b of the lift cylinder 31 moves to the left in FIG. 7, the work implement 11 descends. The changeover switch 84
Is switched to the ascending side, the first switching valve 71 'switches to the second position, and the cylinder body 3 of the lift cylinder 31
One hydraulic chamber 73a of the first switching valve 71 '
The oil tank 70 is communicated with the inlet of the oil tank 70 via the port 71d and the second port 71b. Accordingly, the piston rod 31b of the lift cylinder 31 moves to the right in FIG. 7, so that the work implement 11 rises.

(Third Embodiment) In the second embodiment,
Although the mercury sensors 82 and 83 are provided inside the top plate 64a of the operation panel 64, the present invention is not limited to this.
As shown in (a), the step board 62 of the pilot mounting table 62
9 (b), and may be located on the swing axis L of the swing body 36 and arranged in front and rear of each other as shown in FIG. 9 (b). Also in this case, one mercury sensor 82 is located on the front side of the other mercury sensor 83. Even when the mercury sensors 82 and 83 are provided in this way, the mercury sensors 82 and 83 are not affected by vibration, so that the detection operation is reliably performed.

(Other Embodiments) In each of the above embodiments, the lower end of the lift cylinder 31 of the work machine 11 is attached to the bracket 33 rotatably attached to the traveling vehicle body 1 via the shaft 32. 34, but is not limited to this.
May be rigidly fixed to the traveling vehicle body 1. In this way, for example, when the working machine 11 rides on an uneven portion such as a ridge, the piston rod 31b of the lift cylinder 31
, The work machine 11 can be easily moved over the ridge.

Further, in each of the above embodiments, the front support shaft of the swinging vehicle body 36 is the drive shaft of the work machine 11, but the invention is not limited to this. When attached, the rear support shaft of the swinging vehicle body 36 may be used as the drive shaft of the rear work machine. In this case, it is necessary to prevent the rear working machine and the pilot mounting table 62 from interfering with each other.

Further, in each of the above embodiments, the pilot mounting table 6 is used.
2 is disposed on the swing axis L of the swinging body 36, but is not limited to this.
6 may be disposed slightly offset in the left-right direction from the swing axis L.

In the second and third embodiments, the mercury sensor is used as the angle sensor. However, the present invention is not limited to this. For example, a pendulum sensor may be used.
In short, any configuration may be used as long as the sensor can detect the swing angle of the swing body 36.

In the second embodiment, the mercury sensor 8
2 and 83 are located inside the top plate 64a of the operation panel 64 and are arranged side by side with each other. However, the present invention is not limited to this, and the mercury sensors 82 and 83 are connected to the swing axis L of the swing body 36. The operation panel 64 may be disposed on the inside of the top plate 64a so as to be located on the left and right sides of the boundary and to be linear with each other.

In the third embodiment, the mercury sensor 8
2 and 83 are located inside the step plate 62a and arranged side by side with each other, but are not limited thereto.
The mercury sensors 82 and 83 may be disposed inside the step plate 62a so as to be located on the left and right sides of the swinging axis L of the swinging vehicle body 36 and to be aligned with each other.

With this arrangement, the detection error of the two mercury sensors 82 and 83 is minimized.

Further, in the above-described embodiment, the mowing machine is exemplified as the working vehicle. However, it is needless to say that the working vehicle is not limited to this and may be another working vehicle such as a tiller, a lawnmower, a snowplow, or the like. No. The workplace is almighty and can be used on flat or sloping terrain.

[0062]

As described in detail above, the swing type work of the present invention is performed.
According to the vehicle, when the traveling device is provided on the left and right portions of the traveling vehicle body,
In both cases, with respect to the traveling vehicle body,
The axis of the supporting shaft that runs along
It is located and swingable to swing left and right around the support shaft.
A driving device that supports the vehicle body and drives the traveling device is
Hydraulic pressure fixed to the rocking bodyGeneratorAnd the hydraulic pressureGenerator
PlaceAnd a right and left fixed to the traveling body
Left and right hydraulic motors connected to the drive shaft of the traveling device
Wherein the hydraulic pressure generator isTwo left and right running ports
Pump and charge pump for HST (hydrostatic continuously variable transmission)
And the work machine up / down / swinging body swing pumpSuccess
And the rotation shaft of the traveling pump and the charge for the HST.
For rotating shaft of pump and the work machine up / down / swinging body
The rotary shaft of the pump is connected to the pump so that it can rotate
The traveling on one side around the axis of the supporting shaft of the swinging body
Pump and HST charge pump and work machine
Bottom / Swinging body swing pumps are arranged separately,
Engine and hydraulic oil tanks on each side
Put in frontOil storagePower can be transmitted between the pressure generator and the engine
Connected to the hydraulic motor and the hydraulic pressureGeneratorAnd
Because it was connected via a flexible pipe,
The strength and rigidity and stability of the
The structure of the gearing to reach is simplified,
No special device is required for the body's left and right swing response.
It is possible to reduce the number of points and to support
Improves the right and left weight balance of a swinging body with
This has the effect of increasing the stability of the vehicle.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an oscillating work vehicle according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the configuration of the swing type work vehicle.

FIG. 3 is a partially cutaway plan view showing a main part of FIG. 2;

FIG. 4 is a plan view showing a configuration of an operation panel of the swing type work vehicle.

FIG. 5 is an operation explanatory view of the swing type work vehicle.

FIG. 6 is a hydraulic circuit diagram of the swing type work vehicle.

FIG. 7 is a hydraulic circuit diagram of an oscillating work vehicle according to a second embodiment of the present invention.

FIG. 8 is an explanatory view showing a mounting position of a mercury sensor in the swing type work vehicle.

FIG. 9 is an explanatory diagram showing a mounting position of a mercury sensor in an oscillating work vehicle according to a third embodiment of the present invention.

[Explanation of symbols]

 L Axis of Support Shaft 1 Running Car Body 2 Running Device 9 Hydraulic Motor 30 Support Shaft 36 Swing Car Body 39 Support Shaft 47 Drive 48 Engine (Motor) 51 Hydraulic Pump 70 Oil Tank 74 Swing Cylinder (Hydraulic Cylinder) 75a Flexibility 75b flexible pipe 76a flexible pipe 76b flexible pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-11584 (JP, A) Japanese Utility Model Application Sho 53-101618 (JP, U) Japanese Utility Model Application Utility Model Sho 61-129681 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) A01D 34/86 A01D 67/00 B60K 17/10 B62D 55/116

Claims (3)

(57) [Claims] When a traveling device is provided on the left and right portions of a traveling vehicle body,
In both cases, with respect to the traveling vehicle body,
The axis of the supporting shaft that runs along
It is located and swingable to swing left and right around the support shaft.
A driving device that supports the vehicle body and drives the traveling device is
Hydraulic pressure fixed to the rocking bodyGeneratorAnd the hydraulic pressureGenerator
PlaceAnd a right and left fixed to the traveling body
Left and right hydraulic motors connected to the drive shaft of the traveling device
Wherein the hydraulic pressure generator isTwo left and right running ports
Pump and charge pump for HST (hydrostatic continuously variable transmission)
And the work machine up / down / swinging body swing pumpSuccess
And the rotation shaft of the traveling pump and the charge for the HST.
For rotating shaft of pump and the work machine up / down / swinging body
The rotary shaft of the pump is connected to the pump so that it can rotate
The traveling on one side around the axis of the supporting shaft of the swinging body
Pump and HST charge pump and work machine
Bottom / Swinging body swing pumps are arranged separately,
Engine and hydraulic oil tanks on each side
Put in frontOil storagePower can be transmitted between the pressure generator and the engine
Connected to the hydraulic motor and the hydraulic pressureGeneratorAnd
Connected via a flexible pipe
Rocking work vehicle. 2. The swing type work vehicle according to claim 1, wherein the hydraulic oil tank is mounted on the swing body. 3. Between the traveling vehicle body and the swinging vehicle body,
2. The swinging angle of the swinging vehicle body is adjustable by a double-acting hydraulic cylinder that is operated by oil pressure from the oil pressure generating device.
The oscillating work vehicle as described in the above.