JP4588562B2 - Steering device for tea garden management machine - Google Patents

Description

  The present invention relates to a steering device for a tea garden management machine.

  Conventionally, in a tea garden management machine, a hydraulic continuously variable transmission mechanism (hydrostatic) is provided in a hydraulic pump as a drive source so that the left and right hydraulic crawler travel devices can be individually driven and controlled according to the steering angle of the steering wheel. There are two assembled transmissions (hereinafter referred to as HST) (for example, see Patent Document 1).

FIG. 3 is an exploded configuration diagram of a conventional tea garden management machine steering apparatus, and FIG. 4 is a side view of a hydraulic pump in which two HSTs are assembled.
As shown in FIGS. 3 to 4, in the steering device 1 of the tea garden management machine equipped with such an HST, lots 4, 4, and so on according to the steering angle of the handle 3 by the operator seated on the seat 2. The link mechanism 6 including the links 5, 5, etc. is configured so that the two rod arms 7, 7 individually move forward and backward in a predetermined direction set in advance. Then, these two rod arms 7, 7 supply hydraulic oil to a pair of hydraulic crawler travel devices (not shown) provided on the left and right sides of the airframe via the two pump arms 8, 8. The two HST control shafts 10 and 10 of the hydraulic pump 9 (shown in FIG. 4) to be supplied are individually rotated in the forward direction or the reverse direction, so that there are two main ports A1, A2 or B1 per HST. , B2 is configured so that the left and right crawler travel devices can be individually driven and controlled by switching the oil amount to one of the two and switching to the high pressure side.

However, in such a conventional tea garden management machine steering apparatus 1, as shown in FIG. 3, the rod arms 7, 7 and the pump arms 8, 8 are made of urethane rubber washer (urethane washer). 11 and 11 are coupled and fixed.
Therefore, in particular, the vibration generated by the drive source when the running resistance is increased, for example, when the torque fluctuation is increased such as when climbing or fully open, that is, the engine for driving the hydraulic pump 9 (not shown). In addition, the vibration generated from the hydraulic pump 9 is transmitted from the pump arms 8 and 8 to the rod arms 7 and 7 via the urethane washers 11 and 11.

Then, the vibration of the drive source transmitted to the rod arms 7 and 7 is transmitted to the handle 3 through the link mechanism 6, giving an uncomfortable feeling to the operator who holds the handle 3, and increasing fatigue. Furthermore, the vibrations of the drive source transmitted to the rod arms 7 and 7 cause each part of the airframe to resonate and generate problems such as abnormal noise and damage to the link mechanism 6 and the pump arms 8 and 8 due to vibration.
In addition, the operation of the rod arms 7 and 7 is sensitively transmitted to the pump arms 8 and 8 by the urethane washers 11 and 11, so that an inadvertent handle operation not only makes the aircraft move awkwardly, but also moves forward and backward. There is also a problem that a rodeo phenomenon that makes the aircraft jerky when switching between and quickly.

JP 2002-178774 A

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and it ensures that the operability is maintained while the driving resistance is increased and the rod is moved from the pump arm to the rod. It is an object of the present invention to provide a tea plant management machine steering apparatus that can further reduce vibration from a drive source transmitted to an arm, smooth the movement of the machine, and the like.

In order to achieve the above object, the present invention provides a rod arm that moves forward and backward in a predetermined direction according to a steering angle of a steering wheel, and a hydraulic continuously variable transmission that is incorporated in a hydraulic pump continuously with the rod arm. In a steering apparatus for a tea garden management machine provided with a pump arm that rotates a control shaft of a mechanism to control an oil amount to a hydraulic crawler traveling device, the pump arm includes a long side portion extending in a longitudinal direction and the length of the pump arm. A first arm member having a short side portion extending in a direction orthogonal to the long side portion at one end portion of the side portion and a coupling portion formed on the long side portion and coupled to the control shaft; A second arm member disposed opposite to the arm member and formed with a coupling portion for coupling with the rod arm, and sandwiched between opposing surfaces of the first arm member and the second arm member And a plurality of vibration isolation members fixed until a state, a part of the plurality of vibration isolation members, the provided at both ends of the short sides, the remaining of the plurality of vibration isolation members The vibration-proof member is provided at the end of the long side opposite to the short side (first invention).

According to the first invention, the pump arm has a configuration in which a plurality of vibration isolating members are sandwiched between opposing surfaces of the first arm member and the second arm member, thereby fixing the pump arm from the control shaft. The vibration from the drive source transmitted to the pump arm is greatly reduced, and the torsional rigidity when rotating the control shaft linked to the rod arm is ensured. Accordingly, it is possible to further reduce the vibration from the drive source transmitted from the pump arm to the rod arm in a state where the running resistance is increased without deteriorating the steering feeling . In addition , when the rod arm movement is transmitted to the pump arm, the anti-vibration member is moderately twisted within a range that does not deteriorate the steering performance, so that the rod arm movement is absorbed and relaxed. Is prevented from being transmitted sensitively to the pump arm. As a result, even if an inadvertent steering operation or quick switching between forward and reverse is performed, the aircraft does not get jerky as before, and anyone can move the aircraft smoothly. Furthermore, some of the plurality of vibration isolation members are provided at both ends of the short side portion, and the remaining vibration isolation members of the plurality of vibration isolation members are on the side opposite to the short side portion of the long side portion. It is provided at the end. Thereby, since the rigidity with respect to the torsion generated in the pump arm when the control shaft is rotated is further strengthened, the steering feeling is not impaired even if the vibration isolation member is set to be soft.

  According to the present invention, the pump arm is fixed in a state where a plurality of vibration isolating members are sandwiched between the opposing surfaces of the first arm member and the second arm member, thereby ensuring operability. However, it is possible to reduce the vibration from the drive source that is transmitted from the pump arm to the rod arm when the running resistance is increased, and to make the movement of the machine smoother. An apparatus can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded configuration diagram of a steering apparatus for a tea garden management machine to which the present invention is applied, and FIG. 2 is an exploded perspective view of a pump arm in the same example. In addition, the same code | symbol is attached | subjected about the structural member substantially the same as a prior art example.

First, a steering apparatus 100 for a tea garden management machine to which the present invention is applied will be described.
As shown in FIG. 1, the steering device 100 of the tea garden management machine includes lots 4, 4, links 5, 5, etc. connected to the handle 3 according to the steering angle of the handle 3 by the operator seated on the seat 2. The link mechanism 6 allows the two rod arms 7 and 7 to move forward and backward individually in a predetermined direction set in advance.

  Specifically, the lower portion of the handle 3 is coupled and fixed to the floor 20 in front of the seat 2 so as to be tiltable in the front-rear direction. On the other hand, the upper part of the handle 3 formed in a T-shape is pivotally supported by the lower part of the handle 3 so as to be rotatable about an axis extending in the vertical direction of the machine body. Further, a flat plate-like flange 21 extending in the left-right direction of the machine body is attached to the upper part of the handle 3, and a lot extending in the front-rear direction of the machine body via a pair of left and right lot ends 22 is provided on both left and right sides of the flange 21. The rear ends of 4 and 4 are rotatably attached.

  The front end portions of the lots 4 and 4 are rotatably attached to the upper end portions of the links 5 and 5 extending in the vertical direction of the machine body via the lot ends 23 and 23. These links 5, 5 are connected to the rear ends of bearing stays 25, 25 that are attached and fixed inside the operation box 24 so as to extend toward the rear of the fuselage via a bearing shaft 26 that extends in the left-right direction of the fuselage. It is pivotally supported so that it can rotate. Further, the front end portions of the lots 7 and 7 are rotatably attached to the lower end portions of the links 5 and 5 via the lot ends 27 and 27.

Further, a plunger stay 28 for fixing the tilting of the handle 3 at an arbitrary position is attached to the inside of the operation box 24, and the plunger stay 28 is moved in the front-rear direction according to the tilting operation of the handle 3. The slider 29 is connected and fixed to the lower portion of the handle 3 so as to move forward and backward.
A plurality of concave portions 29 </ b> A formed in a hemispherical shape are formed on both left and right side surfaces of the slider 29 in the longitudinal direction. Then, the steel balls 30 and 30 attached to the left and right side portions of the plunger stay 28 so as to be fitted into the recesses 29A are applied to both side surfaces of the plunger stay 28 by the urging force of the compression springs 31 and 31 arranged sideways. It is energized so that each can move forward and backward. The steel balls 30, 30 and the compression springs 31, 31 are held by nuts 33, 33 and bolts 34, 34 assembled to the plungers 32, 32 fixed to the side surface of the plunger stay 28. As a result, the tilting operation of the handle 3 in the front-rear direction can be fixed at an arbitrary position. Further, the fixation of the handle 3 can be easily performed by tilting the handle 3 in the front-rear direction with a strong force against the urging force of the compression springs 31, 31. A panel 24 </ b> C having various meters 24 </ b> A and switches 24 </ b> B is attached to the upper portion of the operation box 24.

  A pair of hydraulic crawler travel devices provided on the left and right sides of the machine body so as to travel across the teacups via the two pump arms 12 and 12 respectively connected to the pair of rod arms 7 and 7. The two HST control shafts 10 and 10 (see FIG. 4) of the hydraulic pump 9 for supplying the hydraulic oil toward (not shown) are individually rotated in the forward direction or the reverse direction, for example, about 15 degrees. Thus, one of the two main ports A1, A2 or B1, B2 per HST is switched to the high pressure side to control the oil amount. As a result, when the handle 3 is tilted forward, the rods 4 and 4 are moved toward the front side of the aircraft almost simultaneously, so that the upper ends of the links 5 and 5 are directed forward of the aircraft and the lower ends thereof are directed rearward of the aircraft. By rotating and the rod arms 7 and 7 moving toward the rear side of the machine almost simultaneously, the control shafts 10 and 10 are rotated so that the main ports A1 and B1 are on the high pressure side, and the oil amount is controlled. The aircraft moves forward. Further, when the handle 3 is tilted backward, the rods 4 and 4 are moved almost simultaneously toward the rear side of the machine body so that the upper ends of the links 5 and 5 are moved rearward and the lower end part is directed forward of the machine body. When the rod arms 7 and 7 are moved toward the front side of the fuselage almost simultaneously, the control shafts 10 and 10 are rotated so that the main ports A2 and B2 are on the high pressure side, and the oil amount is controlled. The aircraft moves backward. The aircraft speed is determined according to the tilt posture of the handle 3. Further, when the steering wheel 3 is steered left and right, the rod arms 7 and 7 are individually moved forward and backward in different directions by the link mechanism 6 described above, so that the aircraft turns left when it comes to the left, and turns right when it comes to the right. The left and right crawler travel devices can be individually driven and controlled.

  In FIG. 1, the rod arm 7 and the pump arm 12 are shown to be coupled and fixed through the end fitting 13 in a state where the longitudinal direction of the rod arm 7 and the longitudinal direction of the pump arm 12 substantially coincide with each other. The longitudinal direction of the arm 7 and the longitudinal direction of the pump arm 12 are coupled and fixed in a state of being substantially orthogonal to each other via a tip fitting 13 (see FIG. 2; however, the tip fitting 13 is in FIG. 2). Is not shown).

  As shown in FIG. 2, the pump arm 12 includes a first arm member 12 </ b> A having a cylindrical boss portion 12 </ b> A <b> 1 as a coupling portion coupled to the lower end portion of the control shaft 10, and a first arm member 12 </ b> A. And a second arm member 12B in which a coupling hole 12B1 is formed as a coupling portion coupled to the rod arm 7 via the tip fitting 13, and the first arm member 12A and the second arm A plurality of anti-vibration rubbers 12 </ b> C serving as anti-vibration members are fixed to the first and second arm members 12 </ b> A and 12 </ b> B in a state of being sandwiched between surfaces facing the member 12 </ b> B.

  The first arm member 12A is laterally orthogonal to the longitudinal direction at one end portion of the long side portion 12A2 facing in the longitudinal direction, in other words, on the coupling portion side with the rod arm 7 so that the plan view is T-shaped. The short side portion 12A3 is integrally formed. Bolt holes 12A4 to 6A for attaching the anti-vibration rubber 12C are formed in the other end portion of the long side portion 12A2 and the both end portions of the short side portion 12A3, respectively. A part of the long side 12A1 sandwiched between the bolt holes 12A4 and the bolt holes 12A5, 6 is formed to bulge in the lateral direction, and on the upper surface side of the bulged portion, in FIG. A boss portion 12A1 protruding upward is integrally formed. In order to prevent the boss portion 12A1 from slipping out with the lower end portion of the control shaft 10 inserted and inserted, a bolt hole 12A7 into which a retaining bolt (not shown) is screwed extends in the radial direction of the boss portion 12A1. It is formed as follows.

The second arm member 12B is a cross-shaped arm member in plan view having a shape in which the longitudinal direction of the first arm member 12A is further extended toward the connecting portion side with the rod arm 7, and the longitudinal direction A laterally short side portion 12B3 corresponding to the short side portion 12A3 is integrally formed at a substantially central portion of the long side portion 12B2 facing the side.
Further, at one end portion of the long side portion 12B2, a coupling hole 12B1 through which a bolt 14 (illustrated in FIG. 1) for coupling to the rod arm 7 is inserted through the end fitting 13 and long. Bolt holes 12B4-6 for attaching the vibration isolating rubber 12C are drilled in the other end of the side 12B2 and both ends of the short side 12B3 according to the bolt holes 12A4-6, respectively.

  The anti-vibration rubber 12C is arranged on the central axis of the rubber body 12C1 formed in a cylindrical shape so that the bolt shafts 12C2 and 12C2 extend in the vertical direction. And these vibration-proof rubber 12C is the state arrange | positioned between the opposing surfaces of 1st and 2nd arm member 12A, 12B, and each bolt axis | shaft 12C2, 12C2 is bolt hole 12A4-6 or bolt hole 12B4 ~. 6, the pump arm 12 is configured by being fastened and fixed via a washer 16 by a nut 15 screwed into the bolt shafts 12C2 and 12C2.

  Then, with the bottom ends of the control shafts 10 and 10 inserted into the boss portions 12A1 and 12A1 of the pump arms 12 and 12, the retaining bolts are screwed into the 12A7 and 12A7 to thereby secure the control shafts 10 and 10. By performing the retaining, the pump arms 12 and 12 and the control shafts 10 and 10 are coupled and fixed. In addition, the bolts 14 and 14 are inserted from above with the end fittings 13 and 13 supporting the ends of the rod arms 7 and 7 positioned on the upper surfaces of the coupling holes 12B1 and 12B1 of the pump arms 12 and 12, respectively. In addition, the nuts 17 and 17 are screwed into the bolts 14 and 14 inserted through the coupling holes 12B1 and 12B1, so that the pump arms 12 and 12 are coupled and fixed to the rod arms 7 and 7 so as to be rotatable in a horizontal plane. Is done. Note that the hardness of the rubber main body 12C1 is such that the plurality of anti-vibration rubbers 12C are appropriately twisted within a range in which the steering performance is not deteriorated at the initial time when the movement of the rod arms 7, 7 is transmitted to the pump arms 12, 12. Is set to

According to such a configuration, the link mechanism 6 including the lots 4 and 4 and the links 5 and 5 connected to the handle 3 according to the steering angle when the operator seated on the seat 2 steers the handle 3 causes 2 The two rod arms 7 and 7 individually move forward and backward in a predetermined direction (here, the front-rear direction). The two pump arms 12 and 12 respectively connected to the pair of rod arms 7 and 7 individually rotate the control shafts 10 and 10 appropriately in the forward direction or the reverse direction, respectively, so that the two hydraulic pumps 9 By switching any one of the two main ports A1, A2 or B1, B2 for one HST of the HST to the high pressure side and controlling the oil amount, the left and right crawler travel devices are individually driven.
At that time, the pump arms 12 and 12 are driven from the control shafts 10 and 10 by a plurality of vibration isolating rubbers 12C sandwiched between opposing surfaces of the first arm member 12A and the second arm member 12B. Vibration, particularly when the running resistance is increased, is greatly reduced. Further, two of the plurality of anti-vibration rubbers 12C are arranged in parallel in the direction in which the control shaft 10 is rotated, so that the control shafts 10, 10 are moved forward and backward as the rod arms 7, 7 move forward and backward. Even if the torsional rigidity when rotating in the direction or the reverse direction is ensured and the hardness of the vibration-proof rubber 12C is set to be soft, the steering feeling is not impaired.
Further, at the initial time when the movement of the rod arms 7 and 7 is transmitted to the pump arms 12 and 12, the plurality of anti-vibration rubbers 12C are appropriately twisted within a range in which the steering performance is not deteriorated. Is absorbed and relaxed, and the movement of the rod arms 7, 7 is prevented from being transmitted to the pump arms 12, 12 in a sensitive manner. As a result, even if an inadvertent steering operation or quick switching between forward and reverse is performed, the aircraft does not get jerky as before, and anyone can move the aircraft smoothly.

  As described above, according to the present invention, the pump arm 12 is disposed opposite to the first arm member 12A having the boss portion 12A1 coupled to the control shaft and the first arm member 12A and the rod arm. A plurality of anti-vibration fixed in a state of being sandwiched between opposing surfaces of the second arm member 12B in which a coupling hole 12B1 to be coupled to 7 is formed and the first arm member 12A and the second arm member 12B Since the rubber 12C is provided, the vibration from the drive source transmitted from the pump arm 12 to the rod arm 7 in a state where the running resistance is increased while further ensuring operability is further reduced. It is possible to provide a tea garden management machine steering apparatus capable of smoothing the movement of the machine body.

  In addition, this invention is applicable not only to a tea garden management machine but to the agricultural working machine carrying HST.

It is a disassembled block diagram of the steering device of the tea garden management machine to which this invention was applied. It is a disassembled perspective view of the pump arm in the example. It is a disassembled block diagram of the steering apparatus of the conventional tea garden management machine. It is a side view of the hydraulic pump with which two HSTs were assembled.

100 Steering device 3 of tea garden management machine Handle 7 Rod arm 10 Control shaft 12 Pump arm 12A First arm member 12A1 Boss part (joint part)
12B 2nd arm member 12B1 coupling hole (joining part)
12C anti-vibration rubber (anti-vibration member)

Claims (1)

A rod arm that moves forward and backward in a predetermined direction according to the steering angle of the steering wheel and a control shaft of a hydraulic continuously variable transmission mechanism built in a hydraulic pump that is linked to the rod arm is rotated to hydraulic pressure. In the steering device of the tea garden management machine provided with a pump arm that controls the amount of oil to the crawler traveling device,
The pump arm has a long side portion extending in the longitudinal direction, a short side portion extending in a direction perpendicular to the long side portion at one end of the long side portion, and a coupling coupled to the control shaft. A first arm member having a portion;
A second arm member disposed opposite to the first arm member and having a coupling portion coupled to the rod arm;
A plurality of vibration isolation members fixed in a state of being sandwiched between opposing surfaces of the first arm member and the second arm member ,
Some of the plurality of vibration isolation members are provided at both ends of the short side portion, and the remaining vibration isolation members of the plurality of vibration isolation members are opposite to the short side portion of the long side portion. A steering apparatus for a tea garden management machine, characterized in that it is provided at an end portion on the side .

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