JPH0597049A - Drive operation method for mowing machine having rubber crawler and device therefor - Google Patents

Abstract

PURPOSE:To simplify driving operation itself simultaneously improving the reliability of driving operation and the safety of a driver by stabilizing the operating posture of a driver in a state that the driver stands at a driver's stand at the rear part of a machine body, in a mowing machine having a rubber crawler. CONSTITUTION:A single operation lever 8 is arranged to the right front part of a driver stand 5 at the rear part of a machine body 2. By means of the operation lever 8, the trunnion shafts of right and left hydraulic pumps 6a and 6b are rotated in the same angle arc in synchronism with each other. Steering clutches 57 are respectively arranged to right and left handles 55 and 56 arranged at the rear part of the machine body 2. When the right and left clutches 57 are operated, the trunnion shafts of the right and left hydraulic pumps 6a and 6b are returned in a given angle arc to a neutral position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is provided with rubber crawlers on both sides of the machine body for running the machine body, and mainly cuts grasses, small trees, etc. growing on the slope of a dike along contour lines, The present invention relates to a method and an apparatus for operating a mower equipped with a rubber crawler used for collecting harvested vegetation.

[0002]

2. Description of the Related Art This type of mower is hydraulically driven and has a pair of left and right hydraulic motors for driving left and right rubber crawlers, and a pair of hydraulic motors for supplying pressure oil to the respective hydraulic motors. Equipped with hydraulic pump. This hydraulic pump is provided with a trunnion shaft for adjusting the amount of pressure oil supplied to the hydraulic motor, and the trunnion shaft is rotated by an operation lever provided in the rear part of the machine body immediately in front of the cab. To be made. In a conventional mower, two operating levers for operating the rotation of each trunnion shaft of a pair of left and right hydraulic pumps are independently provided. Then, in order to cut the contours of the plants on the slope of the embankment, the driver gets on the driver's cab at the rear of the aircraft and operates the above-mentioned two operating levers in a standing posture to move the front and rear of the aircraft. I was moving and turning. That is, the driver always holds the two operation levers with both hands while standing on the driver's cab at the rear of the machine body, and moves the operation levers back and forth in this state to move the operation levers with respect to the neutral position. , And the amount of movement are adjusted to move the aircraft forward and backward and turn.

As described above, the driver stands on the driver's cab of the machine body, and his / her both hands are always holding the respective operation levers to perform the driving operation, so that the driving posture is not stable. In addition to this, when cutting the slope of a dike with contour lines using a mower, a part of the aircraft climbs up or into the unevenness on the slope, and the posture of the aircraft changes suddenly. Sometimes. In this case, the posture of the driver may be greatly changed, and the operation levers held by both hands may be moved unintentionally, or the driver's body may collide with the body. In this case, the traveling direction of the machine body is changed, which greatly hinders the mowing work and may damage the driver.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional method of operating a mower, and stabilizes the driving posture of the driver who operates while standing on the cab at the rear of the machine. Therefore, it is an object to improve both the certainty of the driving operation and the safety of the driver and to simplify the driving operation itself.

[0005]

According to the present invention, there is provided a driving and operating device for a mower equipped with a rubber crawler, which is provided with a pair of rubber crawlers respectively provided on both sides of the machine body and for driving the rubber crawlers separately. In a mower provided with a pair of hydraulic motors and a pair of hydraulic pumps having a trunnion shaft for changing the amount of pressure oil supplied to the hydraulic motors depending on the rotation angle, the mower is provided in front of the cab at the rear of the machine body. It also has one operating lever, a pair of left and right handles provided on the rear part of the machine body, and a V-shaped engaging portion at one end, and the other end is fixed to the trunnion shaft, and is constantly operated by the returning means. A pair of trunnion levers that are returned to the neutral position of the trunnion shaft, and a pair of lateral movement members that are arranged near the trunnion lever and that laterally move in a direction orthogonal to the trunnion shaft. A pair of clutch levers, one end of which is axially attached to each of the lateral moving members, and a cylindrical portion of which the other end is axially engaged with an engaging portion of the trunnion lever, and the pair of lateral levers. A lateral operation rod that is connected to both moving members and that is laterally moved through a vertical operation rod that is rotated by the operation of the operation lever, and the clutch lever that is attached to each of the left and right handles and that is connected via a cable. It is characterized by comprising a pair of left and right steering clutches connected to each other.

[0006]

The lateral movement members are laterally moved by operating one operating lever, and the trunnion shafts of the pair of hydraulic pumps are rotated by the same angle in synchronization with each other via the clutch lever and the trunnion lever. Then, the amount of pressure oil supplied from each hydraulic pump to each hydraulic motor becomes equal and the left and right rubber crawlers travel at a constant speed, whereby the machine body moves straight forward or backward. Also, by operating one or both of the pair of steering clutches while the vehicle is traveling straight to rotate one or both trunnion shafts via the clutch lever and the trunnion lever, the rotation of each trunnion shaft is increased. If the angles are made different, the amount of pressure oil supplied from each hydraulic pump to each hydraulic motor becomes unequal, causing a difference in the traveling speed of the left and right rubber crawlers, causing the machine body to turn. Whether the vehicle is going straight on or turning, the driver standing on the driver's cab at the rear of the vehicle has at least one hand on the steering wheel, so the driving posture is stable, Both the certainty of driving operation and the safety of the driver are enhanced. In addition, since the number of operating levers is one, the driving operation is simpler than in the case of using two operating levers.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on the embodiments shown in the drawings. 1 to 4, the body 2 of the mower 1
Rubber crawlers 3 are attached to both sides of
A mowing unit 4 is mounted on the front part of the machine body 2 so as to be able to move up and down. At the rear part of the machine body 2, a driver's cab 5 is provided for the driver M to get on in a standing posture, and at the lower front portion of the driver's cab 5, left and right integrated hydraulic pumps 6a, 6b are provided. There is. A pair of hydraulic motors 7a, 7b for driving the rubber crawlers 3 are attached to the machine body 2 inside the rubber crawlers 3, respectively. The operation lever 8 adjusts the amount of pressure oil supplied from the hydraulic pumps 6a and 6b to the hydraulic motors 7a and 7b, controls the rotational speed of the hydraulic motors 7a and 7b, and controls the rotational speed of the rubber crawler 3. Used when doing.

The operating device A of the mower 1 is provided with a single operating lever 8, which is attached to a bracket 9 fixed to the machine body 2 by a spindle 11. The rear end 12a of the operating rod 12 is connected to the lower end of the operating lever 8 which projects downward from the support shaft 11. The front end portion 12b of the operating rod 12 has a vertical operating rod 13
Is connected to the first arm 14. This vertical operation rod 1
3, the upper end 13a is attached to a horizontal frame 16 fixed to the upper part of a pair of vertical frames 15 provided at a predetermined interval in the machine body 2 in front of the hydraulic pumps 6a and 6b, and the rear side of the horizontal frame 16 is attached. By the bearing member 17 formed to project to
The lower end portion 13b is attached below the horizontal frame 16 to a lower horizontal frame 18 provided on the vertical frame 15 in parallel with the horizontal frame 16, and a bearing member provided so as to project rearward from the lower horizontal frame 18. 19 rotatably support each.

The trunnion shafts 21a and 21b provided on the hydraulic pumps 6a and 6b are respectively the hydraulic pumps 6a and 6b.
To adjust the amount of pressure oil supplied to the left and right hydraulic motors 7a and 7b, and to adjust the trunnion shafts 21a and 21b.
The trunnion lever 23 for rotating them.
The lower end of is fixed. This trunnion lever 23
Has a V groove 24 with an opening angle of about 90 degrees formed on its upper end, and both sides of the V groove 24 are a left arm 23a and a right arm 23b. The bottom of the V groove 24 is an arc-shaped engaging portion that engages with the cam roller 34 of the clutch lever 32, which will be described later. When the left trunnion shaft 21a is in the neutral position where pressure oil is not output from the hydraulic pump 6a, the center of the left trunnion shaft 21a,
The center line C connecting the centers of the V grooves 24 of the trunnion lever 23 of the trunnion shaft 21a is vertical. The same applies to the right trunnion shaft 21b. Above and behind each trunnion lever 23, upper and lower guide bars 25 and 26 are horizontally arranged at predetermined intervals in the vertical direction, and both end portions of the guide bars 25 and 26 project rearward from the vertical frames 15 on both sides. It is attached to a pair of support plates 27 that are provided. The upper and lower guide bars 25 and 26 are arranged horizontally and orthogonal to the trunnion shafts 21a and 21b, and the lower guide bar 26 is the V groove 2 of the trunnion lever 23.
It is located in the vicinity of 4. The pair of lateral movement members 28 has a rectangular substrate 29 having a predetermined length, a lower bearing member 30 arranged at the lower end of the substrate 29, and the lower bearing member 3.
Consisting of an upper bearing member 31 arranged above 0,
The lower bearing member 30 of each lateral movement member 28 is the lower guide bar 26.
Further, the upper bearing member 31 is slidably supported in the lateral direction by the upper guide bar 25.

As shown in FIG. 5, each lateral movement member 28 is
A pair of clutch levers 32 having a predetermined length are arranged on the front surface of the lower bearing member 30, and one end portion of the clutch lever 32 is disposed on the shaft 33.
Is axially attached to the lateral moving member 28 via a cam roller 34, and a cam roller 34 is axially attached to the front surface of the other end of each clutch lever 32. Further, each clutch lever 32 is connected to the cam roller 3
An engagement pin 36 is provided on the opposite side to the No. 4, and the lower end portion of the tension spring 35 is fixed to the engagement pin 36. The upper end of the tension spring 35 is locked by a screw member 38 attached to a support fitting 37 fixed to the upper portion of the lateral movement member 28. Each clutch lever 32 has its engagement pin 36 always pulled upward by a tension spring 35 and is biased to rotate clockwise about a shaft 33, and its cam roller 34 is in a neutral position. It is fitted in the V groove 24 of 23. As shown in FIG. 4, the lateral operation rod 39 is arranged midway between the upper and lower guide bars 25 and 26 and in parallel with them. The lateral operation rod 39 is the left rod 39
a and a right rod 39b to which a connecting member 41 is attached at the left end thereof. With both clutch levers 32 in the neutral position, the left rod 39a has the left end thereof at the left side lateral movement member 2
8 is fixed to the support plate 42 provided on the horizontal movement member 28, and the right end of the support plate 42 is fixed to the horizontal movement member 28 so as to sandwich the support plate 43 provided on the right side movement member 28 together with the connecting member 41. The right end portion of the horizontal operation rod 39 has a second arm 4 that projects rearward from the vertical operation rod 13 below the first arm 14.
It is connected to 4. The second arm 44 is provided at a right angle to the first arm 14. Here, when the grass mower 1 is moved forward, the vertical operation rod 13 is rotated in the direction of arrow D in FIG. 4, but in this case, the left rod whose both ends are fixed to the lateral movement members 28, 28. The reference numeral 39a indicates that the lateral movement members 28, 28 are guided by the upper and lower guide bars 25, 26 to move in parallel to the paper surface, while the right rod 39b rotates right about the connecting member 41 to the right. Is configured to move to. Left rod 3 of this right rod 39b
Rotation with respect to 9a is possible by a rod end bearing (not shown) provided inside the connecting member 41.

In FIG. 4, the left and right trunnion levers 2
A pair of brackets 45 attached to a support portion (not shown) of the machine body 2 is provided on the left side of the body 3, and a pair of return levers 46 is provided with a shaft 48 at one end thereof for each bracket 45. Each is pivoted. Each return lever 46 has a V groove 47a formed on the inner side surface of the pushing portion 47 at the other end, and the V groove 47a of each of the left and right return levers 46 is formed.
Is an engagement pin 49 rotatably attached to each trunnion lever 23 above each trunnion shaft 21a, 21b.
Can be engaged with each other. Each return lever 46 has a stopper 51 at an intermediate portion between the V groove 47a and the shaft 48.
Is attached to the stopper 51.
One end of is attached. The screw member 53 to which the other end of the tension spring 52 is attached is attached to the bracket 45 via an L-shaped support tool 54. Therefore, the return lever 46 is rotated clockwise about the shaft 48 by the urging force of the tension spring 52 whose one end is locked to the stopper plate 51. Therefore, the left and right trunnion shafts 2
In the return levers 1a and 21b of the trunnion shafts 21a, the V-grooves 47a always push the engaging pins 49 of the trunnion levers 23 toward the trunnion shafts 21a.
The function of returning a and 21b to the neutral position is achieved.

In FIG. 2, 55 is a left handle,
56 is a right steering wheel. A steering clutch 57 is provided on each of the handles 55 and 56, and the other end of the left cable 58 whose one end is attached to the steering clutch 57 of the left handle 55 has the other end on the left lateral movement member 28 in FIG. The right cable 59, which is attached to the support fitting 37 fixed to the right handle 56 and has one end attached to the steering clutch 57 of the right handle 56, is attached to the support fitting 37 fixed to the right lateral movement member 28. Has been. And the left cable 5
The tip of the left wire 61 of No. 8 is connected to the left clutch lever 32 by a pin 62 near the cam roller 34. The tip end of the right wire 63 of the right cable 59 is connected to the right clutch lever 32 by a pin 64. Therefore, the steering clutch 57 of the left handle 55
The left wire 61 is pulled into the left cable 58 and the pin 6
Since the left clutch lever 32 connected to the left wire 61 is rotated counterclockwise about the shaft 33 by 2, the cam roller 34 of the clutch lever 32 is disengaged from the V groove 24 of the trunnion lever 23. The operation of the steering clutch 57 of the right handle 56 is exactly the same.

Next, the case of advancing the mower 1 will be described. In FIG. 3, when the operation lever 8 in the neutral position is pushed forward to rotate the support shaft 11 in the clockwise direction, the operation rod 12 is moved. Is pulled backwards and the vertical operation rod 1
The first arm 14 of No. 3 is rotated rearward. The rotation of the first arm 14 causes the vertical control rod 13 to rotate in the same direction as shown in FIG. 6, and the second arm 44 provided on the vertical control rod 13 also rotates in the same direction. Be moved. Therefore, the lateral operation rod 39 connected to the second arm 44 of the vertical control rod 13 moves to the right in FIG. 4, so that both lateral movement members 28, 28 are guided by the upper and lower guide bars 25, 26. Move in the same direction. By the movement of both lateral movement members 28, 28, the clutch lever 32 pivotally attached to each lateral movement member 28 moves in the same direction and pushes the trunnion lever 23 engaged with the cam roller 34 thereof to the right. Therefore, the left and right trunnion levers 23 rotate the left and right trunnion shafts 21a and 21b in the clockwise direction, so that the pressure oil sent from the left and right hydraulic pumps 6a and 6b passes through the left and right trunnion shafts 21a and 21b. The same amount is supplied to the left and right hydraulic motors 7a and 7b. Therefore,
The left and right hydraulic motors 7a and 7b rotate at a constant speed, and the left and right rubber crawlers 3 and 3 travel at a constant speed, whereby the mower 1 goes straight. Then, when the vehicle 2 is run at a constant speed along the contour line of the slope of the embankment while the reaping unit 4 is operated to reaper the vegetation, the driver M keeps standing on the cab 5. In each posture, the left and right handles 55, 56 are held with both hands. When changing the speed of the machine body 2 during the reaping work, the operating lever 8 is grasped by one hand to move it forward or backward, and at the same time, the other hand is used to operate one of the handles 55, Hold 56 and do. In this way, the operating lever 8 can be gripped with one hand, and either handle 55 or 56 can be gripped with the other hand to perform the driving operation of the machine body 2, so that its posture is stable. During the mowing, it is necessary to change the speed depending on the amount of vegetation and the unevenness of the traveling portion of the machine body 2. In this case, if one operating lever 8 is operated, the left and right trunnion shafts 21a are operated as described above. , 21b are rotated by the same angle, the speed of the machine body 2 is changed while the straight movement of the machine body 2 is maintained.

Next, the case where the vehicle body 2 is turned while it is moving forward will be described. When the driver M operates the operation lever 8 with his left hand and grips the steering clutch 57 of the right handle 56 with his right hand, 7, the right wire 63 of the right cable 59 is pulled up as shown by the arrow. Therefore, the right clutch lever 32, which is connected to the right wire 63 by the pin 64, is rotated counterclockwise about the shaft 33.
4 moves out upward from the bottom of the V groove 24 of the right trunnion lever 23. In this way, the clutch lever 32 that regulates the movement of the right trunnion lever 23
Since the cam roller 34 of No. 2 separates from the bottom of the V groove 24, the tension spring 52 acting in the direction of pulling down the stopper plate 51
However, the return lever 46 is rotated clockwise about the shaft 48. Therefore, the push lever 47 at the tip of the return lever 46 pushes down the engagement pin 49 of the right trunnion lever 23 by the V groove 47a, and the engagement pin 49 becomes V.
It is moved to the top of the groove 47a. In this way, when the engaging pin 49 is moved to the top of the V groove 47a of the return lever 46, the right trunnion shaft 21b is rotated to the neutral position, and the pressure oil is supplied to the right hydraulic motor 7b. Stops, the rotation of the right rubber crawler 3 stops, and the machine body 2 turns to the right. On the other hand, when the machine body 2 is turned to the left, the driver M uses the right hand to operate the steering lever 8 in the same manner as described above.
The steering clutch 57 of the left handle 55 may be gripped with the left hand while operating. In the above description, the steering clutch 57 of either the left or right handle 55, 56.
In the case where the steering wheel 57 is completely gripped, the steering clutch 57 of the right handle 56 is weakly gripped and is squeezed about half (so-called half-clutch state).
In particular, the rotation of the clutch lever 32 with respect to the shaft 33 becomes smaller than that shown in FIG. Therefore, the return lever 46 cannot return the clutch lever 32 to the neutral position, and the right trunnion shaft 21b is in a slightly opened state, so that the rotation speed of the right hydraulic motor 7b is reduced. Therefore, the turning radius of the machine body 2 becomes larger than that in the case where the steering clutch 57 is completely gripped.

Further, while the airframe 2 is moving, the traveling speed of the airframe 2 can be adjusted by finely adjusting the amount of grip of each of the left and right steering clutches 57 (the degree of the half-clutch state). You can also adjust the running direction. To move the machine body 2 backward, the operation lever 8 may be rotated in the opposite direction to the above, and by operating the left and right steering clutches 57 when the machine body 2 moves backward, the machine body 2 moves backward. You can turn.

[0016]

According to the present invention, a single operating lever provided in front of the driver's cab at the rear of the machine body is operated to rotate the trunnion shafts of the pair of left and right hydraulic pumps in synchronization with each other and rotate the same angle. The aircraft is moved straight forward and backward, and while the aircraft is moving straight, one or both steering clutches attached to the pair of left and right handles at the rear of the aircraft are operated to operate each trunnion of the pair of hydraulic pumps. Since the structure is such that the turning angle of the shaft is different and the machine body is turned, the driver standing at the rear of the machine should direct at least one hand to the steering wheel both when the machine body goes straight and when it makes a turn. Get out. For this reason, the driving posture of the driver in the standing posture is stabilized, and even if a part of the driving posture gets into the unevenness of the slope or gets on the slope while the aircraft is moving, the driving posture is not greatly deteriorated. Both the certainty of driving operation and the safety of the driver are enhanced. Further, since the number of the operating lever is one, the driving operation becomes easier as compared with the case of the conventional two operating levers.

[Brief description of drawings]

FIG. 1 is a side view of a mower equipped with a drive operating device A according to the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is a side view of a drive operating device A according to the present invention.

FIG. 4 is a front view of the drive operating device A when the machine body 2 is stopped.

5 is a sectional view taken along line XX of FIG.

FIG. 6 is a front view of the drive operating device A when the machine body 2 is moving forward.

FIG. 7 is a front view of the drive operating device A when the machine body 2 that is moving forward turns right.

[Explanation of symbols]

 A: Driving operation device M: Driver 1: Mower 2: Machine body 3: Rubber crawler 5: Driver's cab 6a, 6b: Hydraulic pump 7a, 7b: Hydraulic motor 8: Operating lever 13: Vertical operating rod 21a, 21b: Trunnion Axis 23: Trunnion lever 24: V groove of trunnion lever 28: Lateral movement member 32: Clutch lever 34: Cam roller (cylindrical part) 39: Lateral operation rod 55: Left handle 56: Right handle 57: Steering clutch

Claims (2)

[Claims] 1. A pair of rubber crawlers provided on both sides of the machine body, a pair of hydraulic motors for separately driving the rubber crawlers, and a pressure oil amount supplied to the hydraulic motors is changed depending on a rotation angle. In a mower provided with a pair of hydraulic pumps having a trunnion shaft for
By operating a single operating lever provided in front of the driver's cab in the rear part of the machine body, the trunnion shafts of the pair of hydraulic pumps are synchronized with each other and rotated by the same angle to move the machine body straight forward and backward. While the vehicle is moving straight, one or both of the steering clutches attached to the pair of left and right handles at the rear of the vehicle are operated to make the turning angles of the trunnion shafts of the pair of hydraulic pumps different from each other. A method of operating a mower equipped with a rubber crawler, characterized in that the mower is rotated. 2. A pair of rubber crawlers provided on both sides of the machine body, a pair of hydraulic motors for separately driving the rubber crawlers, and the amount of pressure oil supplied to the hydraulic motor is changed according to a rotation angle. In a mower provided with a pair of hydraulic pumps having a trunnion shaft for
One operation lever provided at the front of the driver's cab at the rear of the machine, a pair of left and right handles provided at the rear of the machine, and a V-shaped engaging portion at one end, and the other end A pair of trunnion levers that are fixed to the trunnion shaft and that are constantly returned to the neutral position of the trunnion shaft by the returning means, and a pair of lateral members that are arranged in the vicinity of the trunnion lever and that move laterally in the direction orthogonal to the trunnion shaft. A moving member, and one end of each of which is axially attached to each of the lateral moving members,
A cylindrical portion pivotally attached to the other end is connected to both the pair of clutch levers that are respectively engaged with the engaging portions of the trunnion lever and the pair of lateral movement members, and is rotated by operating the operation lever. A horizontal operation rod that is horizontally moved via a vertical operation rod that is moved; and a pair of left and right steering clutches that are attached to the left and right handles and are connected to the clutch lever via a cable. By operating the lever, the lateral movement members are laterally moved,
Through the clutch lever and the trunnion lever, the trunnion shafts of the pair of hydraulic pumps are rotated in synchronization with each other by the same angle to move the machine body forward and backward, and at the same time, while the machine body is traveling straight, the pair of steering wheels are operated. By operating one or both of the directional clutches to rotate one or both trunnion shafts via the clutch lever and the trunnion lever, the turning angles of the respective trunnion shafts are made different to rotate the machine body. An operation device for a mower equipped with a rubber crawler.