JP2000233774A - Rocking device for semi-crawler unit - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a work vehicle having a semi-crawler unit mounted on the rear part of a vehicle body, the semi-crawler unit is formed to be swingable, and the swing is regulated to make the finished surface of the work wavy. Not to occur. A crawler 1 of a semi-crawler unit 12
The semi-crawler unit 12 is formed so as to be able to swing around the axis of the sprocket wheel 14 in a range from a state where the flat 7 is in contact with the ground to a state where it is raised forward. The right and left semi-crawler units 12, 12 are connected by a bar 18r, and a biasing means 2 is provided between the bar 18r and the transmission case 20.
2, the semi-crawler unit 12 is urged in a direction in which the semi-crawler unit 12 comes into flat contact with the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swinging device for a semi-crawler unit, and more particularly to a swinging motion of a semi-crawler unit formed to swing around a sprocket wheel mounted on a rear wheel mounting portion. It concerns the device.

[0002]

In a work vehicle such as a tractor, wheels with tires (not shown) are usually mounted on the rear part of the vehicle body. However, depending on the condition of the field and the contents of work, a semi-crawler unit may be used. May be attached. The semi-crawler unit ranges from a state where the crawler is flatly grounded to a state where the crawler is raised forward by a predetermined angle,
It is formed so that it can swing around the axis of the sprocket wheel. For this reason, the semi-crawler unit swings back and forth when stepping on unevenness of the ground, so that the running feeling is good for the operator, but when the swing of the semi-crawler unit is repeated, the work connected to the rear of the vehicle body is performed. There is a problem that the machine moves up and down, causing a waving phenomenon on the tilling trail. Also, when the tractor is switched from the forward to the reverse position and starts, the front of the semi-crawler unit rises and the facing angle of the crawler becomes smaller, and in wetlands, the semi-crawler unit may sink or roughen the headlands. become.

Therefore, in a working vehicle having a semi-crawler unit mounted on the rear part of a vehicle body, the semi-crawler unit is formed so as to be swingable, and the swing is regulated to prevent the finished surface of the work from waving. Therefore, a technical problem to be solved arises, and an object of the present invention is to solve this problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object. A semi-crawler unit is mounted on a rear portion of a vehicle body, and the crawler of the semi-crawler unit is brought into a flat ground contact state. In a work vehicle in which the semi-crawler unit is formed so as to be swingable around the axis of a sprocket wheel within a range up to a predetermined angle, the left and right semi-crawler units are connected by a bar, And a biasing means between the body and
An object of the present invention is to provide a swinging device for the semi-crawler unit in which the biasing means biases the semi-crawler unit in a direction of flatly contacting the ground.

[0005]

An embodiment of the present invention will be described below in detail with reference to the drawings. In FIG. 1 to FIG.
Indicates a tractor as an example of a work vehicle, and has semi-crawler units 12, 12 mounted on left and right rear wheel flanges 11, 11, respectively. The semi-crawler unit 1
2 is the sprocket wheel 1 on the crawler frame 13
4 and track rollers 15, 15, ... and tension roller 1
6 and a crawler 17 is wound around the sprocket wheel 14, the track rollers 15, 15... And the tension roller 16.

Each of the semi-crawler units 12 has a sprocket wheel 1 in a range from a state in which the crawler 17 is in flat contact with the ground to a state in which the crawler 17 is raised forward by a predetermined angle.
4 so as to be able to swing around the axis. Also,
Bars 18f, 18r are provided in the front lower part and the rear lower part of the sprocket wheel 14 in the left-right direction, respectively, and both ends of the bars 18f, 18r are connected to the left and right crawler frames 1 respectively.
It is fixed inside 3,13. Therefore, the bars 18f, 1
At 8r, the left and right semi-crawler units 12, 12 are connected, and the left and right semi-crawler units 12, 12 swing substantially integrally.

[0007] A bracket 19 protrudes forward substantially at the center of the rear bar 18r on the left and right sides, and the transmission case 2
A biasing means 22 is interposed between the bracket 21 fixed to the lower surface of the bracket 0 and the bracket 19 of the bar 18r. The urging means 22 is formed so as to rebound when compressed in the axial direction. The front end of the urging means 22 is pivotally attached to the bracket 21 by a pin 23, and the rear end of the urging means 22 is It is pivotally attached to the bracket 19 by pins 24. Further, since the urging means 22 is supported by the bracket 19 from both the left and right sides, the lateral movement of the bar 18r is restricted, so that the semi-crawler unit 12 can be prevented from rolling.

The structure of the urging means 22 is not particularly limited. For example, as shown in FIG. 4, a stopper 26 is provided on an outer (outer cylinder) 25a of the telescopic rod 25, and the telescopic rod 25 is provided. A stopper 27 is provided at the front end of the inner (inner cylinder) 25b, that is, at a position near the pin 23, and a coil spring 28 is interposed between the two stoppers 26 in a compressed state. By the coil spring 28, the inner 25b of the telescopic rod 25 is urged in the direction in which the inner 25b projects from the outer 25a, that is, the telescopic rod 25 is extended. Thus, the telescopic rod 25 and the coil spring 28
Are combined to form the urging means 22, but in addition, a hydraulic damper or a gas damper may be used,
Alternatively, various configurations such as a combination of these dampers and coil springs can be considered, and the present invention is not limited to this embodiment.

When the crawler 17 of the semi-crawler unit 12 tries to swing from the state of flat contact shown by the solid line in FIG. A compressive force acts on the urging means 22 interposed between 19 and 21. In response to this compressive force, a repulsive force is generated in the urging means 22 in the extension direction, and the bar 18r is pushed back, so that the semi-crawler unit 12 is urged flat to contact the ground. Therefore, when the tractor 10 is traveling, even if there are small irregularities on the ground, the swing of the semi-crawler unit 12 is regulated, and it is possible to prevent the finished surface of the ground from waving.

Here, when the tractor 10 crosses the shore or the like, the inclination of the vehicle body increases, and the vehicle weight overcomes the repulsive force of the urging means 22, and as shown by the two-dot chain line in FIG. The crawler unit 12 is a sprocket wheel 14
And rotates until it is raised by a predetermined angle. Then, after the vehicle crosses the shore, the semi-crawler unit 12 is pushed back by the urging of the urging means 22, and is grounded flat.

Further, when the tractor 10 is switched to the reverse position and started, the front portion of the semi-crawler unit floats up in the conventional type to reduce the facing angle of the crawler. Since the semi-crawler unit 12 is urged in the direction of flat contact with the repulsive force, the semi-crawler unit 12 does not sink or roughen the headland even in a wetland or the like.

On the other hand, in order to stretch the crawler 17 of the semi-crawler unit 12, the slide shaft 30 of the tension arm 29 is slid to press the tension roller 16 against the inner surface of the crawler 17, as shown in FIG.
By providing the slide shaft 30 at an angle, the rear portion of the tension arm 29 is fitted between the sprocket wheel 14 and the track roller 15. Therefore, the distance between the sprocket wheel 14 and the tension roller 16 can be reduced, and the semi-crawler unit 12 can be made compact.

In addition, two brackets 31 are provided below the crawler frame 13 in the front-rear direction (the left-right direction in FIG. 3).
The center of a swing link 32 is pivotally attached to each bracket 31 with a pin 33, and track rollers 15, 15 are mounted before and after the swing link 32. Further, a pin 33, which is a pivot of the swing link 32, and the rotating shafts 15a, 15a of the track rollers 15, 15 are arranged on a straight line.

As shown in FIG. 5A, since the pin 33 of the swing link 32 is conventionally located above the rotating shaft 15a of the track roller, the swing links 32 are provided close to each other. In such a case, when the swing links 32 swing, the adjacent track rollers 15 may contact and interfere with each other. On the other hand, as shown in FIG. 5B, by arranging the pin 33 of the swing link 32 and the rotating shaft 15a of the track roller 15 on a straight line, the swing links 32, 32 swing. In this case, the adjacent track rollers 15 and 15 do not interfere with each other.
Therefore, the semi-crawler unit 12 can be made compact by bringing the swing links 32, 32 closer together.

Here, the sprocket wheel 14 may be configured to be able to be divided into two (or three or more). For example, as shown in FIG. 6, a sprocket wheel 14a having a boss and a sprocket wheel 1 having a partial circle
4b so that both can be integrated by fastening means such as bolting. When assembling the semi-crawler unit 12, as shown in FIG. 7 (a), first, the sprocket wheel 14a with the boss is attached to the rear wheel flange 11 with the joint portion thereof facing upward, and the track rollers 15, 15,. The crawler 17 is turned around the tension roller 16.

Next, when the engine is driven to rotate the sprocket wheel 14a by about 180 degrees, as shown in FIG. 7 (b), the crawler 17 meshes with the sprocket wheel 14a to apply tension. After that,
As shown in FIG. 7C, the sprocket wheel 1
If the partial circle sprocket wheel 14b is bolted to 4a, the sprocket wheel 14 is integrated to assemble the semi-roller unit 12. When disassembling the semi-crawler unit 12, the procedure is reversed. As described above, by forming the sprocket wheel 14 in a divided manner, the work of attaching and detaching the crawler 17 becomes easy even when the slide amount of the slide shaft 30 provided on the tension arm 29 is small.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0018]

As described in detail in the above embodiment, the present invention provides a work vehicle in which the semi-crawler unit is made swingable so that the crawler of the semi-crawler unit comes into flat contact with the crawler from a state in which it rises forward. The bias in the direction restricts the swing of the semi-crawler unit. In this manner, the semi-crawler does not inadvertently swing due to small irregularities on the ground, and it is possible to prevent the finished surface of the ground from waving.

[Brief description of the drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 is a side view of a tractor on which a semi-crawler unit is mounted.

FIG. 2 is a partial cross-sectional view of the tractor on which the semi-crawler unit is mounted, as viewed from the back.

FIG. 3 is an enlarged side view of a main part of the semi-crawler unit.

FIG. 4 is a side view showing an example of an urging unit.

FIG. 5A is a diagram showing an operation state of a conventional swing link. (B) The figure which shows the operating state of the rocking | linkage link of this invention.

FIG. 6 is a side view of a split-type sprocket wheel.

FIGS. 7A to 7C are explanatory views showing a procedure for assembling a semi-crawler unit using a split-type sprocket wheel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tractor 12 Semi crawler unit 14 Sprocket wheel 22 Urging means

Claims (1)

[Claims] 1. A semi-crawler unit is mounted on a rear portion of a vehicle body, and the semi-crawler unit is attached to a sprocket wheel within a range from a state in which a crawler of the semi-crawler unit is flatly grounded to a state in which the crawler is raised forward by a predetermined angle. In a work vehicle formed to be swingable around an axis,
The left and right semi-crawler units are connected by a bar, an urging means is interposed between the bar and the vehicle body, and the semi-crawler unit is urged by the urging means in a direction of flatly contacting the ground. Characteristic swinging device for semi-crawler unit.