JP2002036808A - Caster of tractor working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster for tractor working machine to be fixed to a tractor in the directly mounted, semi-directly mounted or towed mode includes casters each fitted with a large tire sustaining a large load and having a large outside diameter, wherein the height of its installation space can be lessened. SOLUTION: On the machine body 1 of this tractor working machine, supporting rods 10.10 are mounted as protruding on the left and right sides of the machine body 1, and at its outer end a machine frame for mounting 13 is installed, and a rotary frame f is borne by the machine frame 13 in such a way as rotatable to the left and right about a fulcrum axis P stretching in the vertical direction, and an axle supporting member g to support the axle 20 of each wheel 2 is mounted on the rotary frame f slidably fore and aft and borne thereby in such an arrangement that the axle 20 supported by the member g displaces between a position ahead of the fulcrum axis P and a position behind, and the hub 21 of each wheel 2 is fitted on the axle 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor working machine which is mounted directly or semi-directly on a tractor or towed and connected to the tractor to travel and perform various agricultural works by operating the tractor. The present invention relates to an improvement on a free wheel or a free wheel which is mounted so as to be freely rotated with respect to a vehicle.

[0002]

2. Description of the Related Art A universal wheel B in a conventional agricultural tractor working machine A is, for example, a fertilizer spreader that is mounted on a tractor in a semi-direct mounting type via a three-point connecting hitch to perform a fertilizer spraying operation. As shown in FIGS. 1 to 3, a tractor (not shown) is provided on the front side of a body 1 on which a fertilizer hopper a and a spraying device b for spraying fertilizer fed from a feeding outlet thereof are mounted. The upper connecting hitch c that connects to the top link of the three-point link hitch mounted on the rear side of the fuselage, and the lower connecting hitch d that connects to the left and right lower links
d and a stand e that can be folded and stored.

[0003] Support rods 10 protruding outward are fixedly mounted on the left and right sides of the body of the body 1, respectively, and the protruding ends thereof are respectively substantially horizontally directed rearward. A projecting support frame 11 is provided, and a fulcrum axis P in a vertical direction is provided at each rear end of the support frame 11, and a predetermined fulcrum axis is provided at each lower end thereof with respect to the axis direction of the fulcrum axis P. Rotating frame f that slants at an angle and hangs down
Is mounted so as to freely pivot about the fulcrum axis P, and a horizontal axle 20 is axially supported on the lower end side of the rotating frame f. The hub 21 is rotatably supported so as to form a universal wheel B, whereby the vehicle body 1 is supported so as to be able to travel freely, and when the vehicle body 1 advances, the traveling that the wheels 2 receive Due to the resistance, the turning frame f that supports the wheels 2 is turned around the fulcrum axis P in a posture protruding backward with respect to the traveling direction of the body 1, and in this state, the body 1
The free wheel B turns so as to follow the change in the traveling direction of the vehicle.

[0004]

The universal wheel B in the conventional agricultural tractor working machine A has a large working machine, so that the load bearing capacity can be increased and the traction resistance on a soft ground can be increased. It is desired to increase the tire width of the wheels 2 and increase the outer diameter in order to improve the running performance by reducing the rotation speed, so that when the turning frame f turns around the fulcrum axis P, As shown in FIG. 3, the turning locus W of the wheel 2 enters the lower surface side of the body 1, thereby supporting the turning frame f so as to be pivotable about the fulcrum axis P as shown in FIG. 1. The mounting height H from the frame 11 to the grounding surface of the wheels 2 is increased, and the body 1 is pushed upward, which causes a problem that the entire body 1 is raised.

[0005] In order to improve the turning performance when turning by the operation of the steering wheel of the tractor, the universal wheel B is mounted on the fuselage 1 by being moved forward so as to approach the tractor side with the pivot position. Interference occurs on the front side of the body 1 where the connecting hitch c and the lower connecting hitches d and d are provided, thereby causing a problem that the configuration of the body 1 is restricted.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems which occur in the conventional means, and can be freely applied to a tractor working machine which is mounted on a tractor in a form of direct mounting, semi-direct mounting, or towed. It is an object of the present invention to provide a new means capable of reducing the height of a mounting space for a wheel as a large tire having a large load resistance and a large outer diameter.

[0007]

According to the present invention, as means for achieving the above-mentioned object, the body 1 of the tractor working machine A is provided with supporting rods 10 projecting to the left and right sides thereof. A mounting frame 13 is provided at the outer end of the frame, and a rotating frame f is mounted on the mounting frame 13 so as to be rotatable left and right by a vertical fulcrum axis P. An axle support member g for supporting the axle 20 of the wheel 2
So that the axle 20 supporting it is displaced from a position occupying the front of the fulcrum shaft P to a position occupying the rear.
A universal wheel in a tractor working machine in which the axle 20 has the hub 21 of the wheel 2 fitted thereto is slidably mounted on the axle 20 to support the tractor working machine. Axle support member g supporting axle 20 on a rotating frame f that is rotatably supported
Are mounted slidably in the front-rear direction, and mounted on the hub 21 of the wheel 2 fitted on the axle 20 supported by the axle support member g.
Are provided on the rotating frame f at positions forward and rearward of the fulcrum axis P for supporting the rotating frame f. Ratchet claws 51, 51 meshing with the engaging teeth 53 are rotated by their rotation. The body 1 is arranged symmetrically so that the moving ends abut against each other and the axle 20 is located rearward.
When the body 1 is moved forward while the axle 20 is located forward, the engagement teeth 53
Are engaged with one of the ratchet pawls 51, and the axle supporting member g is moved forward and backward by the rotational force of the wheels 2 when the body 1 moves forward and backwards, with the meshing engaging teeth 53 as a fulcrum. A free wheel is provided in the tractor working machine according to claim 1, wherein the movable wheel is moved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the means of the present invention, a tractor working machine A connected to and mounted on a tractor has its body 1 mounted thereon.
As shown in FIG. 4, the top link 30 and the left and right lower links 31.
31 and a three-point link hitch consisting of a semi-direct mounting type, and a case where the tractor T is mounted on the vehicle body as a direct mounting type in which the body 1 is directly connected and mounted by a mounting frame (not shown). Further, any configuration may be adopted, such as a case in which the body 1 is connected and towed to a towing hitch provided on the rear surface side of the vehicle body of the tractor T and mounted as a towing type.

The wheel 2 which is formed as a universal wheel B in the vehicle body 1 and which is pivotally supported may have a tire width and an outer diameter which satisfy the required load resistance and running performance on soft ground. As shown in FIG. 5, a tire 22, a rim 23 for supporting the tire 22, a disk 24 connected to the tire 22, and a hub (wheel boss) 21 for pivotally supporting the axle 20 at the center of the disk 24, You may comprise like a normal wheel.

However, in order to form the wheel 2 into a universal wheel B, a rotating frame f that rotates by a fulcrum axis P in a vertical direction is provided at the outer end of a supporting rod 10 mounted on the body 1. The axle 20 of the wheel 2 is deflected on the rotating frame f in the front-rear direction, which is the traveling direction of the wheel 2 with respect to the fulcrum axis P, and the hub 21 of the wheel 2 is mounted on the axle 20. When forming the caster mechanism K by supporting it, the caster mechanism K
In the case where the disc 24 is connected to the inner periphery of the rim 23 as shown in FIG. On the other hand, the tire is mounted so as to be deviated in one direction, and a large space U is formed on the inner peripheral side of the tire 22 so that the caster mechanism can be stored in the space U.

A caster mechanism K for rotatably supporting a turning frame f supporting the axle 20 of the wheels 2 about a vertical fulcrum axis P is, for example, fixedly mounted on the body 1 as shown in FIG. As shown in FIG. 8, a mounting machine frame 13 formed in a U-shape when viewed from the front and rear is fixedly mounted at the distal end of the supporting rod 10 and a pair of upper and lower faces of the mounting machine frame 13 are opposed to each other. The fulcrum axis P is connected to the upper fulcrum axis P
-1 and a lower fulcrum shaft P-2, which are separately mounted, and the rotating frame f is freely rotated around the fulcrum shaft P by the vertical fulcrum shaft P on the mounting machine frame 13. By supporting the axle 20 of the wheel 2 on the rotating frame f, and mounting the hub 21 of the wheel 2 on this,
The traveling direction of the wheels 2 is freely changed around the fulcrum axis P by the rotation of the rotation frame f, and the axle 20 of the wheels 2 mounted on the rotation frame f is attached to the mounting machine. A vertical fulcrum axis P provided at a fixed position on the frame 13
On the other hand, as shown in FIGS. 6 and 7, the vehicle is deflected in the front-rear direction with respect to the traveling direction of the wheels 2 and is mounted on a rotating frame f, whereby a predetermined caster angle is obtained. 1, the rotation of the wheel 2 about the fulcrum axis P is automatically performed in accordance with the change of the traveling direction, and the mounting machine frame 13 and the vertical fulcrum axis P provided on the A caster mechanism K is provided by a rotatable frame f rotatably supported and an axle 20 of a wheel 2 which is deflected in the front-rear direction with respect to the fulcrum axis P along the vertical direction. May be configured.

Thus, in the embodiment, the caster mechanism K of the universal wheel of the tractor working machine according to the present invention is capable of adjusting the rotation angle of the wheel 2 by the rotation of the rotation frame f about the fulcrum axis P to a desired angle. The angle range is restricted.

This is because when the caster mechanism K is stored in the space U formed on the inner peripheral side of the tire 22 of the wheel 2 as described above, the wheel 2 and the rotating frame f supporting the wheel 2 are stored. However, in order to restrict the range so as not to interfere with the mounting machine frame 13 and the support rod 10, the wheels 2 and 2 were mounted on both sides of the machine body 1 close to the machine body 1 as shown in FIG. Sometimes, the steered wheels 32 of the tractor T
When the tractor T is turned by rotating the tractor T, the rotation of the tractor T is restricted within a range where the wheels 2 that follow the tractor T do not interfere with the body 1.

In the illustrated example, the rotation angle of the wheel 2 is regulated by a vertical machine wall 131 serving as a main portion of the mounting machine frame 13 formed in a U-shape as shown in FIG. 9 and 10, the front and rear ends of the rear side of the rotating frame f abut against the left and right side edges 131a of the rotating frame f. The rear surface serves as a regulating member to regulate the rotation range within a predetermined angle range θ. In the illustrated example, the rotation range is regulated by about 30.
In this manner, the wheels 2 are pivotally supported at desired positions in the front-rear direction of the aircraft 1 as long as there is no interference with the aircraft 1 at the end of the restricted rotation range. To get.

In the means of the present invention, the rotation range around the fulcrum axis P of the rotation frame f around which the axle 20 of the wheel 2 is mounted is restricted to a certain angle range.
When the traveling direction of the body 1 is switched between forward and reverse, the positive / negative switching of the caster angle with respect to the traveling direction does not depend on the rotation about the fulcrum axis P of the rotating frame f.
By moving the supporting position of the axle 20 of the wheel 2 supported on the rotating frame f back and forth with respect to the rotating frame f, the fulcrum shaft P
By switching between a position occupying the front and a position occupying the rear.

For this reason, the turning frame f has a guide function for guiding the axle supporting member g, which supports the axle 20 of the wheels 2 and is supported by the turning frame f, to be freely displaced in the front-rear direction. The configuration is as follows.

For example, as shown in FIG. 8, the rotating frame f itself is formed in a guide frame shape that is continuous in the front-rear direction with a cross-sectional shape that forms a channel when viewed in the front-rear direction. An axle support member g provided with an axle 20 that supports the hub 21 of the wheel 2 via a bearing 201 is inserted so as to freely slide back and forth, and the slide is inserted into the front and rear ends of the axle support member g. Provided on the upper and lower portions of the axle support member g, and a stopper S protruding toward the guide surface 40 of the rotating frame f is provided at the center of the rear side of the axle support member g. The stopper S is provided on the guide surface 40 of the rotating frame f so as to extend in the front-rear direction so as to straddle the fulcrum axis P in the plan view. When the stopper S abuts against the rear end of the restriction slot 41 and the rearward movement of the axle support member g is stopped, the axle 20 is positioned behind the fulcrum shaft P. When the vehicle 1 moves forward and the wheels 2 are operated as free wheels, and when the stopper S abuts against the front end of the restriction slot 41, the forward movement of the axle support member g is stopped. The axle 20 is positioned ahead of the fulcrum axis P, and the wheels 2 are operated as free wheels when the body 1 moves backward.

An axle support member g for supporting the axle 20 of the wheel 2 is slid back and forth with respect to the rotating frame f so that the axle 20 to be supported on the axle 20 is located at a position behind the fulcrum axis P, and The operation of switching and moving to the forward position is such that the wheels 2 are dragged in that direction by the advance of the body 1, and the axle support member g is automatically moved with respect to the rotating frame f by the load received at that time. May be performed by sliding in the direction.

However, by utilizing the rotational force of the wheel 2 at this time, the position of the axle 20 of the wheel 2 is forcibly displaced between a position forward and a position behind the fulcrum axis P. It becomes possible to.

An example of means for displacing the axle 20 of the wheel 2 in the front-rear direction of the rotating frame f using the rotational force of the wheel 2 will be described with reference to the embodiment shown in FIGS. More specifically, the pivot frame f is positioned at two positions, a front portion and a rear end portion, at a position straddling a fulcrum axis P that supports the pivot frame f. f, supporting shafts 50 projecting toward the outer surface side which is the side facing the wheel 2 on one of the left and right side surfaces of the supporting shaft 50
The ratchet pawls 51, 51 are rotatably fitted to the respective ratchet pawls 50, and the ratchet pawls 51, 51
Are arranged in such a manner that their rotating end sides abut against each other on the front surface of the axis of the fulcrum shaft P, and abut against the upper surfaces of the rotating frames f on the back sides of the ratchet claws 51. In addition, regulating pins 52 for regulating the downward rotation from the state position are provided, and the ratchet claw 51 pivotally supported by the front supporting shaft 50 is shown in FIG.
7, the ratchet claw 51 pivotally supported counterclockwise from the position shown in FIG.
From the state position described above. A plurality of engaging teeth 53 meshing with the ratchet claws 51 are provided on the hub 21 of the wheel 2 fitted to the axle 20 so as to be substantially equally arranged in the circumferential direction thereof. .

As a result, the axle support member g for supporting the axle 20 of the wheel 2 is moved by the stopper S provided on the axle 20 reaching the rear end of the restriction elongated hole 41. In a state where the hub 21 of the wheel 2 is rotated in the double-headed arrow A direction in FIG. The engaging teeth 53 rotate freely by pushing up the ratchet pawl 51 at the rear position, and therefore, when the wheel 2 advances in the direction of arrow B in this state, it acts as a free wheel.

In the state shown in FIG.
When the wheel 2 is pushed backward in the direction of arrow C in FIG. 12, the wheel 2 and the hub 21 rotate in the direction of arrow d, thereby engaging with the hub 21. As shown in FIG. 13, one of the teeth 53 abuts against the end surface 51a of the rear ratchet claw 51 on the rotation end side, and is locked at that position. As a result, the hub 21 rotates clockwise in FIG. 13, and the stopper S provided on the axle support member g that supports the axle 20 sequentially moves forward in the regulating long hole 41, When the axle support member g moves forward in the order shown in FIGS. 13 to 18, and when the axle 20 moves to a position displaced forward by a distance w2 with respect to the fulcrum axis P as shown in FIG. , Stopper S at that position
Reaches the end on the front end side of the restriction elongated hole 41 and abuts on the front end side of the restriction elongated hole 41, whereby the position is maintained.

In this state, the hub 2
1 and the engaging teeth 53 that rotate with the hub 21.
Are disengaged from the ratchet claw 51 at the rear position, and while pushing up the ratchet claw 51 at the front position from below, FIGS.
It will rotate as shown in FIG.

Accordingly, in the state shown in FIG. 18 to FIG. 21, the wheel 2 moves in the direction of the arrow E and rotates in the direction of the arrow to function as a free wheel when the vehicle moves backward.

Thus, the mounting machine frame 13 and a rotating frame f which is rotatably mounted on the fulcrum shaft P in a vertical or substantially vertical posture so as to be rotatable to the left and right. Axle support member g that is slidably assembled and supported
And an axle 20 supported by the caster mechanism K, a support rod 10 for mounting the mounting machine frame 13 on the body 1.
May be directly attached to the outer end of the support rod 10, or an appropriate assembling frame may be provided at the outer end of the support rod 10, and the mounting machine frame 13 may be mounted thereon.

When the mounting frame 13 is directly mounted on the outer ends of the supporting rods 10 mounted on the body 1, the mounting ends of the mounting rods 13 may be mounted on the outer ends of the supporting rods 10 via an assembly frame. When mounted on the mounting machine frame 13, the mounting machine frame 13 is positioned so as to be positioned inwardly away from the wheels 2 mounted via the rotating frame f and the axle support member g. And support rod 10
・ 10 may be provided.

However, the mounting frame 13 provided at the outer end of the support rods 10, 10 is provided with a rotating frame f which is mounted on the support shaft P via a fulcrum shaft P, and an axle support member which is slidably mounted on the support frame f. By setting the vertical and front and rear dimensions together with g and the like within the range of the inner circumference of the tire 22 of the wheel 2, the mounting machine frame 13, the fulcrum shaft P, and the rotation A rim 23 for supporting the tire 22 of the wheel 2 with the moving frame f and the axle support member g;
Can be stored in a space formed on the inner peripheral side of the vehicle.

At this time, the disc 24 connected to the inner periphery of the rim 23 of the wheel 2 and the hub 21 of the wheel 2 assembled thereto are displaced to one side in the axial direction of the wheel 2 so that the inner periphery of the rim 23 When the space U is formed on the inner peripheral side of the rim 23, the mounting machine frame 13
By projecting the outer end of the supporting rod 10 provided with the caster mechanism K, the caster mechanism K can be entirely stored in the wheel 2.

Further, when the disk 24 is displaced in the axial direction to form the space U on the inner peripheral side of the rim 23, the disk 24 is moved beyond the center line Y in the width direction of the contact surface of the tire 22. The caster mechanism K disposed in the space U has its fulcrum axis P positioned on the center line Y of the ground contact surface of the tire 22 as shown in FIGS. It is possible to store it in a state in which it can be stored, and it is possible to form a free wheel with good flexibility while being a built-in type.

At this time, the displacement of the disc 24 in the axial direction is increased so that the space U formed on the inner peripheral side of the rim 23 is positioned with respect to the center line Y in the width direction of the contact surface of the tire 22. By forming the caster mechanism K in this space U deeply so that the fulcrum axis P of the caster mechanism K is located at the center line of the ground contact surface of the tire 22, as shown in FIGS. It can be stored as a state located on Y.

[0031]

As described above, the universal wheel in the tractor working machine according to the present invention is mounted on the mounting machine frame mounted on the outer end portion of the support rod mounted on the body of the working machine, in the vertical support point. A rotating frame that freely rotates left and right around the shaft center is provided, and an axle support member that supports the axle of the wheel is assembled and supported so as to slide back and forth across the fulcrum shaft, Due to the sliding of the axle support member with respect to the turning frame, the position on the axle is switched between a state located behind the fulcrum axis and a state located forward.
Thus, the rotating frame does not need to be rotated 360 degrees about the fulcrum axis, since the rotating frame functions as a free wheel when the aircraft is moved forward and when the aircraft is moved backward. It suffices to rotate a certain angular range around the fulcrum axis, so that the mounting machine frame and the rotating frame pivotally supported via the fulcrum shaft and the axle support member mounted on it are attached to one side of the wheel. Since it can be arranged, the free mounting height including the wheel fitted to the axle supported by the axle support member can be reduced, and the mounting machine frame, rotating frame, axle support member, etc. The caster mechanism can also be configured as a built-in type housed in a space formed on the inner peripheral side of the rim of the wheel.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor working machine equipped with a conventional universal wheel.

FIG. 2 is a rear view of the same.

FIG. 3 is a plan view without the hopper.

FIG. 4 is an overall plan view of a tractor working machine equipped with a free wheel according to the means of the present invention.

FIG. 5 is a vertical sectional front view of the universal wheel.

FIG. 6 is a cross-sectional plan view of the universal wheel.

FIG. 7 is a partially cutaway side view of the same universal wheel.

FIG. 8 is an exploded perspective view of each member of the adjustable wheel.

FIG. 9 is an explanatory diagram of a state in which the rotation range of the rotation frame about the fulcrum axis of the adjustable wheel is regulated.

FIG. 10 is an explanatory diagram of a state in which a rotation range when the rotation frame of the universal wheel is rotated in the opposite direction is restricted.

FIG. 11 is an explanatory diagram of an angle range in which the rotating frame of the universal wheel rotates left and right.

FIG. 12 is an explanatory diagram of a displacement operation of an axle support member of the adjustable wheel.

FIG. 13 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 14 is an explanatory diagram of a displacement operation of an axle support member of the adjustable wheel.

FIG. 15 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 16 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 17 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 18 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 19 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 20 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

FIG. 21 is an explanatory diagram of a displacement operation of the axle support member of the adjustable wheel.

[Explanation of symbols]

A: Tractor working machine, B: Free wheel, H: Mounting height, K:
Caster mechanism, P: fulcrum shaft, S: stopper, T: tractor, U: space, W: turning locus, Y: center line of tire contact surface, a: fertilizer hopper, b: spraying device, c: upper connecting hitch, d: lower connecting hitch, e: stand, f: rotating frame, g: axle support member, w1, w2: distance, θ:
Angle range, 1 ... body, 10 ... support rod, 11 ... support frame, 13
... Mounting machine frame, 130 ... Support plate, 131 ... Machine wall, 131a ...
Side edge, 2 ... Wheel, 20 ... Axle, 201 ... Bearing, 202 ...
Bearing, 21 hub, 22 tire, 23 rim,
24 ... Disc, 30 ... Top link, 31 ... Lower link, 32 ... Steering wheel, 40 ... Guide surface, 41 ... Regulated slot,
50: Support shaft, 51: Ratchet claw, 51a: End face, 52
... regulating pins, 53 ... engaging teeth.

Claims (5)

[Claims] 1. A body 1 of a tractor working machine A is mounted with supporting rods 10 protruding on both left and right sides thereof, and a mounting machine frame 13 is provided at an outer end thereof. An axle support member g for supporting the axle 20 of the wheel 2 is mounted on the axle frame f so that the axle 20 supports the axle 20 of the wheel 2. Is slidably mounted back and forth so as to be displaced between a position occupying the front of the fulcrum shaft P and a position occupying the rear thereof, and a tractor working machine having a hub 21 of a wheel 2 fitted on an axle 20 thereof. Freewheel in. 2. An attachment frame 13 mounted on the outer end of a support rod 10 supported on the body 1, and a rotation frame f rotatably supported on the support shaft P in a vertical direction so as to be able to turn left and right. And an axle support member g, which is slidably supported back and forth, in a space on the inner peripheral side of the rim 23 of the wheel 2, and the hub 21 of the wheel 2 is supported by the axle support member g. The universal wheel in the tractor working machine according to claim 1, wherein the universal wheel is fitted on the axle (20). 3. A disk 24 of the wheel 2 supporting the hub 21 at the center by connecting the outer peripheral side to the rim 23 is mounted on the tire 22.
The disc U is displaced to one side with respect to the center line Y of the ground plane and is connected to the inner periphery of the rim 23, and the space U having a depth exceeding the center line Y on the inner side of the rim 23 on the other side of the disc 24 is formed. In this space U, a mounting machine frame 13 mounted on the outer end of the support rod 10 supported on the machine body 1 and a rotation supporter which is rotatable left and right through a fulcrum shaft P in a vertical direction. Moving frame f
And an axle support member that can be slidably supported back and forth
g so that the fulcrum axis P is located on the center line Y, and the hub 21 of the wheel 2 is connected to the axle support member g.
2. The universal wheel in a tractor working machine according to claim 1, wherein the wheel is fitted on an axle 20 supported on the tractor. 4. An attachment frame 1 mounted on an outer end of a support rod 10.
3 and a rotating frame f rotatably supported on the left and right via a fulcrum axis P in the vertical direction.
3. A universal wheel in a tractor working machine according to claim 1 or 2, further comprising a regulating member for regulating rotation in the left-right direction about the fulcrum axis P within a predetermined angle range. 5. An axle 2 is provided on a rotating frame f which is rotatably supported on the mounting machine frame 13 so as to be rotatable left and right by a fulcrum axis P in a vertical direction.
The axle support member g supporting the axle 0 is slidably assembled in the front-rear direction and is supported. The hub 21 of the wheel 2 fitted on the axle 20 supported by the axle support member g is substantially equally distributed in the circumferential direction thereof. A plurality of engaging teeth 53 are provided, and on the rotating frame f, ratchet pawls meshing with the engaging teeth 53 are provided at positions forward and rearward of a fulcrum axis P for supporting the rotating teeth f. 51, 51 are arranged symmetrically so that their rotating ends abut each other, and when the body 1 is moved backward while the axle 20 is located rearward, and when the axle 20 is located forward. When the fuselage 1 is advanced in the state of being engaged, the engagement teeth 53.
51 so that the axle support member g is moved forward and backward by the rotational force of the wheels 2 when the body 1 moves forward and backwards, with the meshing engagement teeth 53 as a fulcrum. The universal wheel in the tractor working machine according to claim 1, wherein