JP2000232802A - Tractor top link fixing device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To enable storage of a top link holder that holds a top link at a retracted position when not in use by swinging left and right, and at a holding position that holds the top link, The top link and the top link holder are prevented from swinging left and right and interfering with other members. SOLUTION: In a tractor in which a top link 9 is pivotably attached to a rear part of a tractor vehicle body so as to be vertically swingable, a top link holder 17 for holding the top link 9 at a retracted position where the top link 9 is swung upward is provided at the rear part of the tractor. A positioning member 20 is provided so as to be swingable to the left and right, and is removably engaged with the top link holder 17 to position the top link holder at a holding position for holding the top link 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor top link fixing device.

[0002]

2. Description of the Related Art Normally, a three-point link can be attached to a rear portion of a tractor, and a top link of the three-point link is pivotally attached to a rear portion of a tractor body so as to be vertically swingable.

[0003]

In a tractor,
When not using the three-point link, a top link holder that holds the top link at the retracted position that is swung upward is provided at the rear of the tractor body so that the top link does not need to be removed. A tractor that is provided at the rear of the vehicle body so as to be able to swing left and right is considered. In this top link holder, a state in which the top link protrudes rearward from the rear surface side of the tractor body is a holding position for holding the top link at the retracted position. It can be stored by swinging in the direction.

However, if the top link holder can be swung right and left, the top link and the top link holder wobble left and right (sway left and right) during traveling, for example, and the top link or the top link holder is positioned near the top link and the top link holder. There is a risk of interference with a member (for example, a hydraulic hose or the like). The present invention has been made in view of the above problems, and prevents a top link holder from swinging left and right at a holding position for holding a top link at a retracted position, even when the top link holder is swingable left and right. It is an object of the present invention to provide a top link fixing device capable of performing the following.

[0005]

The technical means taken by the present invention to achieve the above object is to provide a tractor in which a top link is pivotally attached to the rear of the tractor body so as to be vertically swingable. A top link holder for holding the top link in a retracted position in which the top link is swung upward is provided so as to be swingable left and right, and a holding position for holding the top link by being detachably engaged with the top link holder. A positioning member for positioning the top link holder.

A positioning member is fixed to a rear portion of the tractor body, and a top link holder is supported so as to be able to swing up and down. Can be configured to be released. Further, the top link holder is preferably biased by a spring so as to return to the holding position from a position deviating upward or downward from the holding position. Further, the positioning member may include a guide portion for guiding the top link holder to the holding position.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show a first embodiment. In FIG. 2, reference numeral 1 denotes a two-axis four-wheel tractor, 2 denotes a tractor body, and the tractor body 2 includes an engine, a clutch housing behind the engine, The main structure is directly connected to the mission case on the rear side. On the rear of the tractor body 2 (mission case), a tractor 1
A hydraulic device 3 for raising and lowering a work machine mounted on the rear part of the vehicle is provided.

A rear wheel fender 5 is provided on both left and right sides of the rear portion of the tractor body 2 to cover the rear wheel 4 from inside.
Between the left and right rear wheel fenders 5 is provided a floor sheet 6 made of a plate material such as metal that covers the upper and front sides of the hydraulic device 3. The left and right ends of the floor sheet 6 are fixed to the rear wheel fender 5. ing. Note that the rear wheel fender 5 and the floor seat 6 are supported by the tractor vehicle body 2 via support members, and a driver's seat 7 is provided on the floor seat 6 via a support device. A steering device 8 is provided in front of the vehicle.

At the rear of the tractor body 2, there is provided a three-point link 11 comprising an upper top link 9 located at the center in the left-right direction and a pair of lower links 10 on the left and right. I have. A mounting base 12 for mounting the top link 9 is provided on the rear surface side of the tractor vehicle body 2, and a ball joint on the front end side of the top link 9 is attached to the mounting base 12 via a pin in the left and right direction. The top link 9 is pivotally attached to the rear of the tractor vehicle body 2 so as to be vertically swingable.

Each of the left and right lower links 10 has a ball joint at the front end thereof rotatably mounted on a left and right direction pin provided on the rear side surface of the tractor body 2. The ball joints on the rear end side of the top link 9 and the left and right lower links 10 are pivotally attached to the connecting portion of the working machine so as to be rotatable around a left-right axis. The middle part of the left and right lower links 10 is connected to a lift arm 14 of the hydraulic device 3 via a lift rod 13.
It is connected to. As shown in FIGS. 1 and 2, the rear portion of the floor sheet 6 is formed to be inclined so as to move upward as it goes rearward.
On the upper end side of the rear portion, an upper wall portion 6a extending rearward from the main body side, a rear wall portion 6b extending downward from the rear end side of the upper wall portion 6a, and an inner side of the rear wall portion 6b. An L-shape is formed from a vertical wall portion 15a that is overlapped and fixed to the (front side) and a lower wall portion 15b that extends forward from the front end side of the vertical wall portion 15a and is fixed to the main body side of the floor sheet 6. A long tubular portion 16 is formed in the left-right direction from the reinforcing plate 15 and the like.

The lower wall 15 b of the reinforcing plate 15, which forms the lower surface of the cylindrical portion 16, serves as a support wall for supporting the top link holder 17. This top link holder 17
The top link 9 holds the top link 9 at a retracted position (shown by a phantom line in FIG. 2) which is swung upward when not in use, and is attached to the lower wall portion 15b by support means 18. A mounting bracket 19 is fixed to the cylindrical portion 16. The mounting bracket 19 is detachably engaged with the mounting bracket 19 to be detachably engaged with the top link holder 17. Is fixed.

The mounting bracket 19 is disposed at the center in the left-right direction of the tractor 1 (between the left and right rear wheel fenders 5), and is superimposed on the rear surface of the rear wall portion 6b constituting the rear surface side of the tubular portion 16. A vertical wall portion 19a fixed to the rear wall portion 6b by bolts or welding, and a lower wall portion 15b extending forward from the front end side of the vertical wall portion 19a and constituting the lower surface side of the cylindrical portion 16; It is formed in an L-shape from the horizontal wall portion 19b superposed on the lower surface. The top link holder 17
Is formed by bending a rod. As shown in FIG. 4, a supported portion 21 having a circular shape in a plan view is formed on one end side (front portion), and a flat surface is formed on the other end side (rear portion). An open hook-shaped holding portion 22 is formed toward one end side as viewed.

Note that the top link holder 17 is not limited to a rod, but may be formed of a plate material or other members. As shown in FIGS. 1, 3 and 4, the supported portion 21 of the top link holder 17 is a cylindrical member vertically arranged on the lower surface side of the horizontal wall portion 19 b (lower wall portion 15 b) of the mounting bracket 19. The collar 23 is loosely fitted to the collar 23, and the collar 23 includes a bolt 26 and a nut 2.
5 attaches and is fixed to the side wall 19b (support wall). That is, the nut 25 is fixed to the upper surface side of the lower wall portion 15b by welding or the like, and the bolt 26 is attached to the collar 2 from below through the washer 24 located on the lower surface side of the collar 23.
3 and the horizontal wall portion 19b and the lower wall portion 15b.
Are screwed into the nut 25.

The collar 23 has a pair of washers 27 and 28 disposed so as to vertically sandwich the supported portion 21 of the top link holder 17, and a lower washer 28 and a collar 23. Spring 29 interposed in a compressed state between the washer 24 and the washer 24 located on the lower surface side of the coil 29
Is externally fitted. The collar 23, washer 24, 2
7, 28, a nut 25, a bolt 26, and a spring 29 constitute a support means 18 for supporting the top link holder 17, and the support means 18 causes the top link holder 17 to move from the bolt 26 in the horizontal direction (the bolt 26).
(In the radially outward direction), is supported in a horizontal posture (rotatable about a vertical axis) in the horizontal posture, and resists the urging force of the spring 29. And swingably supported from a horizontal position up and down.

The top link holder 17 has a horizontal wall 19
The position protruding rearward from b is the holding position for holding the top link 9 at the retracted position, and when not in use, the top link holder 17 is swung from the holding position in the left-right direction so that the side wall portion 19b Can be stored at the lower side (storage position). In order to cause the top link 9 to be held by the top link holder 17, for example, in a state where the top link holder 17 is in the storage position, the top link 9 is swung upward to be located forward of the retreat position, and then Then, the top link holder 17 is swung to the holding position, and thereafter, the top link 9 is swung downward to be engaged with the holding portion 22 in an in-fit state.

The positioning member 20 is formed by bending a rod, and has a vertical mounting portion 20a and a mounting portion 2a.
0a is provided with an open hook-shaped engaging portion 20b extending upward from the lower end side, and the mounting portion 20a is fixed to the vertical wall portion 19a of the mounting bracket 19 by welding or the like. Note that the hook-shaped engaging portion 20 of the positioning member 20
The front end side of b is bent in an arc shape downward so that the top link holder 17 is not caught. In the above configuration, as shown in FIGS. 1 and 5, in a state where the top link holder 17 is at the holding position, the middle part of the top link holder 17 is engaged with the engaging portion 20 b of the positioning member 20. The top link holder 17 swings left and right in this state.
Is regulated by the top link holder 1
7 is positioned at the holding position, and the top link 9 and the top link holder 17 are prevented from swinging left and right to interfere with members located around the top link 9 and the top link holder 17.

When the middle part of the top link holder 17 is engaged with the engaging portion 20b of the positioning member 20, the distance between the top link holder 17 and the engaging portion 20b in the left-right direction is reduced as much as possible (or It is preferable to configure so as to eliminate it. Also, the top link holder 17
Is stored below the lower wall 15b from the holding position.
The top link 9 is attached to the holding portion 22 of the top link holder 17.
From the front link holder 17 (in the direction indicated by the arrow B in FIG. 4), as shown by the phantom line in FIG.
9 upward (in the direction of arrow A) against the urging force of No. 9.

Then, the top link holder 17 is disengaged upward from the engaging portion 20b, and in this state, the left swing of the top link holder 17 is allowed (the right swing is allowed). May be configured). Then, while maintaining this state, by swinging the top link holder 19 to the left (in the direction of arrow C in FIG. 4), the middle part of the top link holder 17 is completely disengaged from the engaging portion 20b, and thereafter By releasing the lifting force of the top link holder 17 (for example, releasing the hand from the top link holder 17), the top link holder 17 is returned to the horizontal position by the spring 29, and can swing to the storage position.

In order to move the top link holder 17 from the storage position to the holding position, contrary to the above operation, the top link holder 17 is swung to the right, and against the urging force of the spring 29. Swing upward, positioning member 2
0, the top link holder 1 is located above the engagement portion 20b.
7 by lifting the lifting force,
The top link holder 17 can be easily positioned at the holding position with a single touch by simply swinging the top link holder 17 to the right, lifting it up, and hooking the top link holder 17 on the engaging portion 20b of the positioning member 20.

The positioning member 20 is used for the floor sheet 6.
It may be directly fixed to. Also, the top link holder 1
The positioning member 20 may be moved to remove the 7 from the engaging portion 20b of the positioning member 20. FIG. 6 shows the second embodiment. The difference from the first embodiment is that the positioning member 20 is formed by a pair of right and left vertical components 30L and 30R formed of a rod or the like. The other configuration is the same as that of the first embodiment.

The left and right components 30L and 30R are arranged at an interval in the left and right direction, and each upper portion has a vertical wall portion 19a of the mounting bracket 19 (or the floor sheet 6).
The lower part of the left and right components 30L, 30R is fixed to the rear side of the rear wall part 6b) of the cylindrical part 16 on the rear upper end side, and projects downward from the vertical wall part 19a of the mounting bracket 19, and An engagement portion 20b that positions the top link holder 17 at the holding position is provided between the lower portions of the components 30L and 30R. Therefore, in this embodiment, the top link holder 17 is pivoted downward against the spring 29 so as to be disengaged downward from the engaging portion 20b.

In this embodiment, the position of the lower end of the left component 30L is located above the position of the lower end of the right component 30R. It is easy to engage with the engaging portion 20b from the left side. Therefore, when detaching the top link holder 17 from the engaging portion 20b, the top link holder 17 is pivoted downward and then pivoted to the left. FIG.
Shows a third embodiment. The difference from the first embodiment is that a positioning member 20 formed by bending a rod or the like is used.
Are arranged in the left-right direction, and the vertical wall portion 19a of the mounting bracket 19 is provided.
Is provided at an intermediate portion in the left-right direction, and is provided with an engaging portion 20b formed of an open concave portion below, and the top link holder 17 is provided on the left side with the engaging portion 20b (that is, a holding position).
The other configuration is the same as that of the first embodiment.

The guide portion 32 is formed at the left end of the engaging portion 20b by bending in an inclined manner such that the guide portion 32 moves upward as it goes to the left. Also, the engaging portion 20b
The guide portion 32 projects downward from the vertical wall portion 19 a of the mounting bracket 19. In this embodiment, the top link holder 17 can be positioned at the holding position only by swinging the top link holder 17 rightward from the storage position to the holding position. That is, when the top link holder 17 is swung rightward from the storage position, the top link holder 17 is swung downward by being guided by the guide portion 32, and when the top link holder 17 gets over the bent portion 33, the restoring force of the spring 29 causes , Automatically engage with the engaging portion 20b.

When removing the top link holder 17 from the engaging portion 20b, the top link holder 17 is swung downward and then swung to the left. FIG. 8 shows the fourth embodiment, which is different from the first embodiment in that the positioning member 20 is constituted by a pair of left and right components 34L, 34R made of a rod or the like. The other configuration is the same as that of the first embodiment. The left side component 34L is disposed in an inclined shape that shifts upward as going to the left, the left end side is fixed to the lower end side of the vertical wall portion 19a of the mounting bracket 19, and from the middle to the right end side. It protrudes from the vertical wall 19a.

The right side structure 34R is arranged vertically, with the upper side fixed to the vertical wall 19a of the mounting bracket 19 and the lower side projecting downward from the vertical wall 19a. In this embodiment, a portion between the right end of the left component 34L and the lower portion of the right component 34R is an engagement portion 20b for positioning the top link holder 17 at the holding position. The lower surface side of the body 34L is the guide portion 32
It has been. In this embodiment, as in the third embodiment, the top link holder 17 can be positioned at the holding position only by swinging the top link holder 17 rightward from the storage position to the holding position. It has become.

That is, when the top link holder 17 is swung rightward from the storage position, the top link holder 17
Is guided downward by the guide portion 32 and swings downward, and when it is displaced rightward from the left side structure L, it automatically engages with the engagement portion 20b by the restoring force of the spring 29. . When removing the top link holder 17 from the engaging portion 20b, the top link holder 17 is swung downward and then swung to the left.

[0027]

According to the present invention, the top link holder for holding the top link at the retracted position where the top link is swung upward is provided at the rear of the tractor so as to be able to swing right and left.
By swinging the top link holder from the holding position for holding the top link in the left-right direction, the top link holder can be located at the non-use position (storage position). In addition, since the positioning member for removably engaging the top link holder and positioning the top link holder at the holding position for holding the top link is provided, the top link holder holds the top link at the retreat position. In the state
It is possible to prevent the top link and the top link holder from swinging in the left-right direction and interfering with members located around the top link and the top link holder.

Further, the positioning member is fixed to the rear part of the tractor, and the top link holder is supported so as to be able to swing up and down. By configuring so that the positioning is released, the top link holder can be positioned and released at the holding position only by operating the top link holder, and the operation is easy. Further, the top link holder is urged by a spring so as to return to the holding position from a position deviating upward or downward from the holding position, thereby facilitating the operation of the top link holder.

Further, by providing the positioning member with a guide portion for guiding the top link holder to the holding position,
Further, the operation of the top link holder is facilitated.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a top link fixing device according to a first embodiment.

FIG. 2 is a side view of the tractor.

FIG. 3 is an exploded perspective view of a top link holder and its supporting means.

FIG. 4 is a plan view of a top link holder.

FIG. 5 is a rear view of the positioning member.

FIG. 6 is a rear view of a positioning member according to a second embodiment.

FIG. 7 is a rear view of a positioning member according to a third embodiment.

FIG. 8 is a rear view of a positioning member according to a fourth embodiment.

[Explanation of symbols]

 2 Tractor body 9 Top link 17 Top link holder 20 Positioning member 29 Spring 32 Guide part

Claims (4)

[Claims] 1. A tractor in which a top link is pivotally attached to a rear portion of a tractor vehicle body so as to be vertically swingable, wherein a top link holder for holding the top link at a retracted position in which the top link is swung upward is swayed to the rear of the tractor. A top link for a tractor, wherein a positioning member is provided so as to be movable, and is removably engaged with the top link holder to position the top link holder at a holding position for holding the top link. Fixing device. 2. A positioning member is fixed to a rear portion of a tractor, and a top link holder is supported so as to be able to swing up and down. 2. The apparatus according to claim 1, wherein the positioning is released.
4. The top link fixing device for a tractor according to 4. 3. The tractor top according to claim 2, wherein the top link holder is biased by a spring so as to return to a holding position from a position deviating upward or downward from the holding position. Link fixing device. 4. The top link fixing device for a tractor according to claim 1, wherein the positioning member includes a guide portion for guiding the top link holder to a holding position.