JPH11268503A - Tread adjusting device for wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously adjust the right and left treads of a front wheel and a rear wheel by coupling a connecting member for connecting the end sides of a spindle of a front wheel and a spindle of a rear wheel to each other to a front wheel arm and a rear wheel arm in such a manner as to be relatively rotated freely and be relatively immovable in the axial direction. SOLUTION: The front end of a connecting member 27 is fixed to the outer peripheral part of a front wheel moving shaft 22, and the rear end of the connecting member 27 is fixed to the outer peripheral part of a rear wheel moving shaft 29. Thus, the rear wheel moving shaft 29 and the front wheel moving shaft 22 are kept constant in the longitudinal shaft-to-shaft distance by the connecting member 27, and the front wheel and the rear wheel moving shafts 22, 29 are enabled to move in the axial direction simultaneously. The rotation of the right and left rear wheel spindles 12 is transmitted to the right and left sleeve shafts through an interlocking link 21 of an interlocking device, so that the right and left front wheel spindles 11 are rotated through the sleeve shaft for the same amount as that of the rear wheel spindle 12. The rotation is transmitted to the right and left front wheel moving shafts 22, so that the right and left front wheel arms 23 are oscillated in the same vertical direction for the same amount.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel adjuster for adjusting the distance between left and right wheels of a vehicle, and more particularly to a wheel adjuster for agricultural vehicles such as vegetable transplanters.

[0002]

2. Description of the Related Art As this kind of vehicle wheel adjuster, for example, one disclosed in Japanese Patent Application Laid-Open No. 9-285211 (hereinafter referred to as "prior art 1") is known. The vehicle of this conventional transplanter includes a front wheel support shaft and a rear wheel support shaft which are provided so as to protrude in the left-right direction from the vehicle body, and a front wheel arm and a rear wheel shaft which are rotatably provided around the axis of the support shaft. A wheel arm, a front wheel and a rear wheel rotatably provided at a distal end portion of the arm, an interlocking device for interlockingly connecting the rotation of the front wheel arm and the rear wheel arm around each of the support shafts, and the front wheel support; And a connecting member for connecting the end portions of the rear wheel supporting shaft to each other.

In order to adjust the distance between the left and right front wheels and the distance between the left and right rear wheels, the front wheel arm and the rear wheel arm are separately and independently moved in the axial direction. Also,
Japanese Unexamined Patent Application Publication No. 10-4726 (hereinafter referred to as “prior art 2”) has a structure in which a front wheel and a rear wheel are supported by left and right frames of a support frame having a rectangular shape in a plan view and constituting a vehicle body.
The left and right frames are movable in the left and right directions to adjust the wheelbase.

[0004]

In the wheel adjusting device of the "prior art 1", the front wheel and the rear wheel have to be adjusted separately, and the adjustment is very troublesome. Further, in the above-mentioned "Prior Art 2", the respective wheelbases of the front wheel and the rear wheel can be adjusted at the same time, but since the supporting frame must be configured to be extendable and contractible in addition to the support shaft, the body structure becomes complicated. Was something.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle wheel adjuster capable of simultaneously adjusting the right and left wheels of a front wheel and a rear wheel without complicating the body structure.

[0006]

In order to achieve the above object, the present invention takes the following measures. That is, the present invention relates to a front wheel support shaft and a rear wheel support shaft which are provided so as to protrude in the left-right direction from the vehicle body, and a front wheel arm and a rear wheel arm which are provided rotatably around the axis of the support shaft. A front wheel and a rear wheel rotatably provided at a distal end portion of the arm, an interlocking device for interlocking the rotation of the front wheel arm and the rear wheel arm around each of the support shafts, A connecting member for connecting the end portions of the wheel supporting shafts to each other, wherein the connecting member is connected to the front wheel arm and the rear wheel arm so as to be rotatable relative to each other and not to move relatively in the axial direction.

[0007] According to the above configuration, the front wheel arm and the rear wheel arm simultaneously swing in the vertical direction via the interlocking device, so that the height of the vehicle body can be freely changed. In addition, by moving the connecting member in the left-right direction, the front wheel arm and the rear wheel arm move in the left-right direction at the same time, and the wheel distance adjustment of the front and rear wheels can be performed simultaneously. The front wheel support shaft and the rear wheel support shaft are rotatably supported by the vehicle body, and the front wheel movement shaft and the rear wheel movement shaft which are rotatable integrally with the support shaft and are axially movable are provided concentrically with the support shaft. The front wheel arm is fixed to the front wheel moving shaft, and the rear wheel arm is fixed to the rear wheel moving shaft, and the end of the connecting member is rotatable relative to each moving shaft and cannot move relative to the axial direction. Preferably they are connected.

It is preferable that a lock device is provided at at least one between the front wheel support shaft and the front wheel movement shaft or between the rear wheel support shaft and the rear wheel movement shaft to prevent relative movement of the two in the axial direction.
It is preferable that a drive shaft is inserted through the shaft portion of the rear wheel support shaft, and a transmission that transmits power from the drive shaft to the rear wheel is provided in the rear wheel arm.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a transplanter is illustrated as a vehicle. This transplanter includes a traveling device 1 and
And a transplant device 2 provided in the traveling device 1. The traveling device 1 has a vehicle body 3, and an engine (not shown), a transmission case 4, and the like are attached to the vehicle body 3. The engine and the transmission case 4 are covered with a hood 5. The vehicle body 3 is supported by a pair of left and right front wheels 6 and a rear wheel 7. These wheels 6, 7
A lock device, a transmission device, which will be described later,
A wheel adjusting device, an interlocking device, a vehicle height adjusting device, a rolling device, and the like are interposed.

A machine frame 8 extending rearward is fixed to an upper portion of a rear portion of the transmission case 4. A handle 9 is attached to the rear end of the machine frame 8. Further, a planting frame 10 is attached to a lower portion of a rear portion of the mission case 4 so as to extend rearward and swing vertically. The transplanting device 2 is provided on the machine frame 8 and the planting frame 10.

The vehicle body 3 is provided with a front wheel support shaft 11 and a rear wheel support shaft 12 projecting from both sides in the left-right direction.
As shown in FIG. 3, the front wheel support shaft 11 includes a pair of left and right base shafts 13 rotatably supported by the vehicle body 3, and the base shaft 1.
3 and an outer shaft 14 fixed to the outer end. The base shaft 13 is a shaft having a circular cross section, and a circumferential groove 15 is formed in the outer periphery thereof. A set screw 16 screwed to the vehicle body 3 is engaged with the circumferential groove 15 to move in the axial direction. Has been prevented. The outer shaft 14 is formed as a hexagonal cylinder shaft, and lock holes 17 are formed at an outer end of the outer shaft 14 at a predetermined pitch.

A cylindrical shaft 18 is externally fitted to the outer shaft 14 on the side closer to the vehicle body. The cylindrical shaft 18 is formed of a hexagonal cylindrical shaft similar in shape to the outer shaft 14, and the outer shaft 14 and the cylindrical shaft 18 can rotate integrally. An axial relative movement between the outer shaft 14 and the cylindrical shaft 18 is prevented by a set screw 19. A bracket 20 projects upward from the cylindrical shaft 18, and a front end of an interlocking link 21 is pivotally supported by the bracket 20 so as to be rotatable.

A front wheel moving shaft 22 is fitted to the outer shaft 14 outside the cylindrical shaft 18 so as to be movable in the axial direction. The front wheel moving shaft 22 is formed of a hexagonal cylinder shaft similar in shape to the outer shaft 14, and the outer shaft 14 and the front wheel moving shaft 22 can rotate integrally. A front wheel arm 23 is fixed to the outer peripheral surface of the front wheel moving shaft 22 in a protruding manner. The front wheel arm 22 has a telescopic structure, and the length of the arm is adjustable. This front wheel arm 2
A front axle 24 is fixed to the front end of the front wheel 2, and the front wheel 6 is rotatably supported on the axle 24. The mounting direction of the front axle 24 is freely replaceable in the left-right direction as shown by a virtual line in FIG.

A bearing 25 is provided on the outer periphery of the front wheel moving shaft 22.
Are provided rotatably and immovable in the axial direction.
The front end of the connecting member 27 is fixed to a flange 26 protruding from the fifth member 5. A lock pin 28 is radially inserted through the front wheel moving shaft 22 so that the lock pin 28 can be inserted into and removed from the front wheel moving shaft 22. And the front wheel moving shaft 22 is positioned in the axial direction, and the relative movement between the two is prevented. Thus, the lock device is constituted by the lock hole 17 and the lock pin 28.

As shown in FIG. 4, the rear wheel support shaft 12 is
It comprises a hexagonal cylinder shaft rotatably supported by the vehicle body 3. A rear wheel moving shaft 29 formed of a hexagonal cylindrical shaft is rotatably fitted on the rear wheel supporting shaft 12 so as to be integrally rotatable and movable in the axial direction.
Further, a traveling drive shaft 30 penetrates through the axis of the rear wheel moving shaft 29. The traveling drive shaft 30 is rotatably supported by the transmission case 4 and transmits a power from an engine. A base spline shaft 31 and a cylinder spline-fitted to the base spline shaft 31 and movable in the axial direction. Shaft 32
And an output shaft 33 fixed to the outer end of the cylindrical shaft 32.

An outer end of the rear wheel moving shaft 29 projects outward from the rear wheel support shaft 12, and the rear wheel arm 3
4 is fixed. The rear wheel arm 34 is configured as a transmission case, and the output shaft 33 is rotatably supported by the rear wheel arm 34. A drive sprocket 35 is provided on the output shaft 33. At the distal end of the rear wheel arm 34, a cylindrical shaft 37 having a driven sprocket 36 is rotatably supported. A chain 38 is looped between the driven sprocket 36 and the driving sprocket 35.

A rear axle 39 is inserted into and supported by the driven sprocket cylinder shaft 37 so as to be integrally rotatable. The rear axle 39 is provided with fixing holes 40 at a predetermined pitch in the axial direction. The rear wheel 7 is fixed to the rear axle 39 by any one of the fixing holes 40 by a pin 41,
It is mounted so that the mounting position can be changed. Also, rear wheel 7
Can be attached to the rear axle 39 with the left and right directions reversed. Further, as shown by the phantom line in FIG.
Reference numeral 9 indicates that the insertion direction of the driven sprocket cylinder shaft 37 can be changed.

Thus, the transmission is constituted by the traveling drive shaft 30, the drive and driven sprockets 35 and 36, and the like. A bearing 42 is provided on an outer peripheral portion of the rear wheel moving shaft 29.
Are provided so as to be relatively rotatable and immovable in the axial direction. The rear end of the connecting member 27 is fixed to the flange 43 of the bearing 42. Thus, this connecting member 27
As a result, the distance between the rear wheel moving shaft 29 and the front wheel moving shaft 22 in the front-rear direction is constant. The connecting member 27 allows the front and rear wheel moving shafts 22 and 29 to simultaneously move in the axial direction.

Therefore, the front and rear wheel moving shafts 22, 2
9, the connecting member 27 and the like constitute the above-mentioned wheel adjusting device. A bracket 44 is provided on the outer peripheral surface of the rear wheel support shaft 12.
Is projected upward, and the rear end of the interlocking link 21 is pivotally supported by the bracket 44 so as to be rotatable. Then
Since the rear wheel support shaft 12 and the front wheel support shaft 11 rotate in conjunction with each other by the interlocking link 21, the interlocking link 21
Constitutes the interlocking device. This link 21
A turnbuckle 45 is interposed in the middle of the link, and the length of the interlocking link 21 is adjustable.

A lock bolt 46 for preventing relative movement with the rear wheel moving shaft 29 is screwed to the rear wheel support shaft 12. Returning to FIGS. 1 and 2, the vehicle height adjusting device and the rolling device will be described. The vehicle body 3 is provided with a lifting cylinder 47 composed of a hydraulic cylinder, and a piston rod of the cylinder 47 is movable in the front-rear direction. An elevating shaft 48 having a left-right axis is disposed on the piston rod. The elevating shaft 48 is supported by the vehicle body 3 by a slide bearing 49 so as to be rotatable and freely in the front-rear direction. Arms 50R and 50L protruding vertically opposite to each other are fixed to left and right ends of the elevating shaft 48, respectively. The two arms 50R, 50L and the bracket 44 projecting from the rear wheel support shaft 12 are connected by links 51R, 51L. Therefore, when the piston rod of the lifting cylinder 47 expands and contracts, the lifting shaft 48 moves in the front-rear direction, and the left and right rear wheel support shafts 12 rotate by the same amount around the axis via the links 51R and 51L. This rotation is transmitted to the left and right rear wheel moving shafts 29, and the left and right rear wheel arms 34 simultaneously swing by the same amount in the same vertical direction, so that the height between the left and right rear wheels 7 and the vehicle body 3 is increased. Is adjusted. The bracket 44 is provided with a plurality of mounting holes so that the mounting position with the link 51 can be adjusted.

The rotation of the left and right rear wheel spindles 12 is transmitted to the left and right cylinder shafts 18 via an interlocking link 21 of an interlocking device. The rotation is transmitted to the left and right front wheel moving shafts 22, and the left and right front wheel arms 23 swing up and down by the same amount in the same direction up and down, so that the left and right front wheels 6 and the vehicle body are rotated. 3 is adjusted in the same direction by the same amount as the height of the rear wheel 7. Thus, the vehicle height is adjusted by the vehicle height adjusting device according to the ridge height.

A rolling cylinder 52 composed of a hydraulic cylinder is disposed in the vehicle body 3 in the front-rear direction. A rolling arm 53 protrudes from the elevating shaft 48, and the piston rod of the rolling cylinder 52 is connected to the rolling arm 53. When the piston rod expands and contracts in the front-rear direction, the lifting shaft 4
8 is rotated about its axis. Due to the rotation of the elevating shaft 48, one of the left and right arms 50R and 50L in the upside-down direction at both ends of the elevating shaft 48 rotates forward and the other rotates rearward, and the left and right arms 50R and 50L rotate. The connected left and right links 51R and 51L move in the front and rear opposite directions, and the left and right rear wheel spindles 12 rotate by the same amount in the opposite directions. Therefore, the left and right rear wheel arms 34
Swing in opposite directions.

The rotation of the left and right rear wheel spindles 12 is transmitted to the front wheel spindle 11 via an interlocking link 21 of an interlocking device.
The left and right front wheel arms 23 also swing in opposite directions. Thus, the left and right front and rear wheels 6, 7 move in directions opposite to each other, so that the vehicle body 3 rolls left and right. That is, when working on a sloped ground, the rolling device keeps the body 3 horizontal.

The transplanting device 2 includes a ground leveling device provided on the lower abdomen of the mission case 4, a seedling supply device provided over a rear portion of the machine frame 8 and a handle 9, and a seedling supply device in front of the seedling supply device. A seedling removal device provided on the machine frame 8, a planting device provided on the planting frame 10 below the seedling removal device, and a planting device provided on the planting frame 10 behind the planting device. It has a pressure suppression device.

The above-described leveling device has a bracket 54 provided on the lower abdomen of the transmission case 4 so as to be swingable in the vertical direction, and a leveling roller 55 is rotatably supported on the bracket 54. The leveling roller 54 is configured to roll on the top surface of the ridge. The seedling supply device has a seedling table 56 for intermittently feeding a seedling tray containing a large number of pot seedlings (soiled seedlings) vertically and horizontally. This seedling mounting table 56
The seedlings are inclined upward so as to reach the rear so that the seedlings can be taken out from the seedling tray.

The seedling take-out device is for taking out seedlings with soil from the seedling tray one by one and supplying them to the planting device, and a pair of left and right take-out claws 57 pierced into the root pot of the seedlings.
And a claw support device 58 for supporting the claw 57, and a claw driving device 59 for moving the claw support device 58. The pawl driving device 59 is fixed to the machine frame 8, and the power of the engine is transmitted from the transmission case 4 via the transmission shaft 60. A drive shaft 61 for driving the seedling supply device protrudes from the claw drive device 59.

The planting device has a planting tube 63 supported by a parallel link mechanism 62 and moving along an elliptical trajectory that is long in the vertical direction and short in the front-rear direction. The planting cylinder 63 receives the seedling from the seedling removal device at the top dead center, and plants the seedling in the ridge at the bottom dead center. The planting transmission 64 that swings the parallel link mechanism 62 to move the planting cylinder 63 in the elliptical orbit is provided by the planting frame 10.
It is provided in.

The pressure-reducing device has a pressure-reducing frame 65 pivotally supported on the rear end of the planting frame 10 so as to be vertically movable. A pair of left and right pressure-reducing rollers 66 are rotatably supported by the pressure-reducing frame 65. Have been. The pressure-reducing rollers 66 are arranged in a C-shape in a front view so as to press the ridge top surfaces on both left and right sides of the planting hole drilled by the planting cylinder 63 to compact the root pot of planted seedlings. I have.

According to the transplanter having the above configuration, the leveling roller 5
5 and the pressure-reducing roller 66 roll on the top surface of the ridge appropriately.
The height of the wheels 6, 7 and the vehicle body 3 is adjusted by the lifting device. When working on a slope, the rolling device keeps the vehicle body 3 horizontal. When the width of the ridges is different or when the planting width is different, the distance between the left and right wheels 6, 7 is adjusted by the wheel adjusting device.

In adjusting the wheel distance, first, the lock pin 28 of the lock device is pulled out, and then the connecting member 27 is pushed to the left or right to move the front wheel moving shaft 22 and the rear wheel moving shaft 29 simultaneously. Then, the lock pin 28 is inserted, and the adjustment operation is completed. The present invention is not limited to the embodiment described above, and it is preferable to provide a driving device such as a cylinder for moving the connecting member 27 in the left-right direction. The vehicle is not limited to the transplanter.

[0031]

According to the present invention, the structure is simple, and at the same time, the distance between the front wheel and the rear wheel can be adjusted.

[Brief description of the drawings]

FIG. 1 is a side view of a work vehicle showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a detailed plan view of a wheel-wheel adjusting device for a front wheel.

FIG. 4 is a detailed plan view of a rear wheel wheel adjusting device.

[Explanation of symbols]

 Reference Signs List 3 vehicle body 6 front wheel 7 rear wheel 11 front wheel support shaft 12 rear wheel support shaft 17 lock hole (lock device) 21 interlocking link (interlock device) 22 front wheel moving shaft 23 front wheel arm 27 connecting member 28 lock pin (lock device) 29 rear wheel Moving shaft 30 traveling drive shaft 34 rear wheel arm 35 drive sprocket (transmission) 36 driven sprocket (transmission)

Continued on the front page (72) Inventor Nobuhide Yanagawa 64 Ishizukitamachi, Sakai-shi, Osaka Inside Kubota Sakai Works

Claims (4)

[Claims] 1. A front wheel support shaft and a rear wheel support shaft provided to protrude in the left-right direction from a vehicle body, and a front wheel arm and a rear wheel arm provided rotatably around an axis of the support shaft. A front wheel and a rear wheel rotatably provided at a distal end of the arm; an interlocking device for interlockingly connecting the rotation of the front wheel arm and the rear wheel arm around each of the support shafts; the front wheel support shaft and the rear wheel A connecting member for connecting end portions of the support shafts to each other, wherein the connecting member is connected to the front wheel arm and the rear wheel arm so as to be rotatable relative to each other and not to be relatively movable in the axial direction. Wheel adjuster. 2. The front-wheel support shaft and the rear-wheel support shaft are rotatably supported by a vehicle body, and the front-wheel movement shaft and the rear-wheel movement shaft that rotate integrally with the support shaft and can move in the axial direction are the support shafts. The front wheel arm is fixed to the front wheel moving shaft and the rear wheel arm is fixed to the rear wheel moving shaft, and the end of the connecting member is relatively rotatably mounted on each moving shaft. 2. The wheelbase adjusting device according to claim 1, wherein the wheelbase adjusting device is coupled so as not to move relative to the direction. 3. The lock device according to claim 2, wherein a lock device is provided between at least one of the front wheel support shaft and the front wheel travel shaft or between the rear wheel support shaft and the rear wheel travel shaft to prevent relative movement of the two. Vehicle wheel adjuster. 4. A drive shaft is inserted into a shaft center portion of the rear wheel support shaft, and a transmission device for transmitting power from the drive shaft to a rear wheel is provided in the rear wheel arm. The vehicle wheel adjuster according to any one of the preceding claims.