JPH0558355A - Crawler type traveling device - Google Patents

Abstract

(57) [Summary] [Object] The present invention is intended to embody a device capable of turning operation without impairing the durability of the crawler as much as possible. [Structure] A crawler 3 is wound between a drive sprocket 1 and a tension roller 2 to form a traveling device 4, and the crawler 3 is provided.
A plurality of rolling wheels 5a, 5b for guiding the lower part of the intermediate portion of
A central wheel group 5c composed of 5c is provided so as to be movable downward in relation to the steering operation, and the central wheel group 5 can push down either one of the left and right braking action side crawlers 3 downward. The central wheel group 5 is configured so that it can be activated when the traveling speed of the braking-side crawler 3 reaches a low speed or a stopped state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler type traveling device, and is used for a traveling vehicle body such as a combine.

[0002]

2. Description of the Related Art A conventional device of this type, for example,
According to the construction described in Japanese Patent No. 2291, the roller roller located on the center side in the front-rear direction of the crawler is replaced by another roller.
Crawler supporting a roller and a crawler wheel
It is separated from the la-frame and is axially supported by another member. An up-and-down telescopic operating device is provided between the shaft-supporting portion of the center side roller and the crawler frame. -The center side roll so that the front and rear sides of the lash float.
The cradle frame can be raised with respect to the drawer.

[0003]

A traveling device composed of this type of crawler, that is, the center wheel group moves downward when the direction is changed (vehicle body turning), and only the central part of the crawler is grounded. A traveling device that can shorten the ground contact length and turn with less resistance is used as an extremely effective device.

However, this traveling device causes various obstacles when the grounding length of the braking side crawler is shortened during traveling in wetlands or at high speeds, etc., resulting in a smooth turning action. There is a problem that can not be done. That is, as in the previous example, the contact length was shortened when traveling in wetlands, etc., so that the aircraft could not be supported at that part and it would sink and cause an obstacle, or when traveling at high speed, turn up with the braking side raised. The aircraft lacked stability and caused problems.

Further, when the center portion of the crawler is pushed down in a high-speed running state, the grounding resistance becomes extremely high, and since it is made of rubber, there is a problem that wear is severe and durability is impaired.

[0006]

The present invention takes the following technical means in order to achieve the above object. That is, the crawler 3 is wound between the drive sprocket 1 and the tension roller 2 to form the traveling device 4, and a plurality of roller wheels 5a for guiding the lower part of the intermediate portion of the crawler 3 are provided. 5b, 5
A central wheel group 5 composed of c is provided so as to be movable downward in relation to the steering operation, and the central wheel group 5 can push down either one of the left and right side crawlers 3 to the lower side. The central wheel group 5 is a crawler-type traveling device configured to operate when the traveling speed of the braking-side crawler 3 reaches a low speed or a stopped state.

[0007]

EXAMPLE First, the structure will be described. The drive sprocket 1 is configured to be driven by being supported by an axle of a mission case 7 provided in the front portion of a chassis 6 as is conventionally known. It is connected to the side clutches and side brakes of the car and is configured so that power can be turned on and off and braking can be applied individually to the left and right.

Reference numeral 8 is a power steering lever,
The left and right side clutches and side brakes can be operated to steer the chassis 6. Tension roller 2
Is provided at the rear of the traveling frame 9 of the chassis 6 so as to be movable back and forth. The crawler 3 is made of rubber and has an endless belt shape. The drive sprocket 1 and the tension roller 2 are
It is wound between and.

The central rolling wheel group 5 includes three rolling wheels 5a, 5b,
5c is supported by the connecting body 10 and is disposed inside the intermediate portion of the crawler 3, and is supported by the swing arm 11 provided at the axis of the rolling wheel 5b. The swing arm 11 is bent in a dogleg shape, the middle portion is pivotally attached to the machine body, and the hydraulic device 12 is connected to the other end to swing the swing arm 11. It should be noted that the hydraulic device 12, like the switching valve 13 shown in the hydraulic circuit of FIG. 4, extends so that the connecting body 10 can be moved downward by the pressure oil, but on the contracted side, the oil is stored in the tank so that it can be freely contracted. It is designed to be able to return to.

The swing arm 11 is provided with a buffer spring 1
4, the central wheel group 5 is tensioned downward so as to keep the central wheel group 5 at the same level as the front wheel wheels 15 and the rear wheel wheels 16. Therefore, the central wheels 5a, 5b, 5c
Can be moved below the front wheel 15 and the rear wheel 16 by the operation of the hydraulic device 12, and when the switching valve 13 is set to neutral, the oil returns to the tank and the buffer spring 14 acts. There is.

The hydraulic device 12 and the buffer spring 1
As shown in FIG. 2, the arrangement of 4 is provided on both sides of the traveling frame 9 and accommodated within the width of the crawler 3.
The front roller 15 has a bobbin type which is swingable by pivotally mounting a V-shaped mounting arm 17 having two rollers 15a and 15b axially attached to both ends on the machine body. Next is the rear wheel 16
Is the same as the front rolling wheel 15 and has two rolling wheels 16a, 1
The buffer spring 14 is constructed in a bogie type so as to be swingable by pivotally attaching a heap-shaped mounting arm 17 having 6b axially attached to both ends to the body of the machine. ..

The vehicle speed sensor 18 is provided in the transmission portion after the side clutch, and the left and right crawlers 3 are separately provided.
The speed (rotation speed) is measured and a signal is sent to the controller 19. When the power steering lever 8 is operated, the switching valve 13 described above is switched and extended when the output signal from the controller 19 is received and one of the rollers 3 is stopped to push down the central wheel group 5. It has become.

In this embodiment, the rolling operation of the vehicle body horizontal control is interrupted when the switching valve 13 starts to operate as described above. As described above, the crawler 3 is the power steering lever of the cockpit.
8 is operated to disengage one of the side clutches, and the side brake is continuously applied. In conjunction therewith, the hydraulic device 12 on the side of the central wheel 5 of the crawler 3 on the side where the braking force is exerted can be extended. It is configured.

In the combine shown in the embodiment, a thresher 20 is mounted on a chassis 6, and a cutting and conveying frame 21 is attached to the front part thereof so as to be vertically rotatable. Next, the operation will be described. First, when the work is started while starting the prime mover and driving the rotating parts of the machine body, the crawler 3 is driven by the drive sprocket 1 to propel the chassis 6.

Then, the grain culms in the field are mowed by the mowing device provided on the mowing and conveying frame 21 at the front part, and are supplied to the threshing machine 20 by the conveying device to undergo the threshing action. In this way, the combine performs the cutting and threshing work. When the crawler 3 travels on an ordinary flat ground, the central rollers 5a, 5b, 5c receive the buffering action of the buffering spring 14 via the connecting body 10 and the swing arm 11 to rotate the front and rear wheels. It is pressed downward while maintaining the same level as the wheels 15 and 16.

Therefore, the crawler 3 has a long ground contact area and can be stably propelled. Next, when the crawler 3 gets over a small high portion such as a ridge, the front wheel 15 and the rear wheel 16 are each of a bogie type, so that the crawler 3 can conform to the surface of the ridge and travel safely. ..

Next, the case of turning will be described.
One side clutch is disengaged by the operation of the power steering lever 8 and the operation is further continued to apply a side brake to give a braking action to the crawler 3. Then, the crawler 3 detects the vehicle speed by the vehicle speed sensor 18 and transmits the vehicle speed to the controller 19 to stop the hydraulic device 1 on the stopped side.
The switching valve 13 of No. 2 switches to the oil feeding side, and the cylinder extends.

Along with this, in the crawler 3, the rolling wheels 5a, 5b, 5c are pushed downward from the front and rear rolling wheels 15, 16 via the swing arm 11 and the connecting body 10, and the grounding portion is at the center thereof. Only the wheel group 5 is provided. Therefore, Crawler 3
On the braking side, the undercarriage 9 can be turned in a state where the pushing of the soil is reduced and the surface of the field is not destroyed, and the consumption horsepower is small.

At this time, the vehicle body 6 is a horizontal control roller.
Since the ring operation is interrupted, complicated movements such as control during operation of the hydraulic device 12 and correction control after completion are reduced.

[0020]

As described above, according to the present invention, when the vehicle is turned, the vehicle is braked to reduce the traveling speed.
Alternatively, when stopped, the central roller group can be pushed down to shorten the grounding length of the crawler. Therefore, the crawler has a feature that the sliding resistance is reduced and abrasion is prevented in advance, and a device having high durability is created.

[Brief description of drawings]

FIG. 1 is a side view of a main part according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part in FIG. 1, which is an embodiment of the present invention.

FIG. 3 is a block circuit diagram showing an embodiment of the present invention.

FIG. 4 is a hydraulic circuit diagram according to the embodiment of the present invention.

FIG. 5 is a side view of the combine according to the embodiment of the present invention.

[Explanation of symbols]

1 Drive sprocket 2 Tension roller 3
Crawler 4 Traveling device 5 Central wheel group 5a, 5b, 5c Wheels

Claims (1)

[Claims] 1. A traveling device 4 is constructed by winding a crawler 3 between a drive sprocket 1 and a tension roller 2.
A plurality of rolling wheels 5a, 5 which guide the lower part of the middle portion of the la 3
A central wheel group 5 composed of b and 5c is provided so as to be movable downward in relation to the steering operation, and the central wheel group 5 has one of the left and right side crawlers 3 on which the braking action is applied downward. The central wheel group 5 is configured so that it can be pushed down, and
Crawler type traveling device configured to operate when the traveling speed of the vehicle reaches a low speed or reaches a stopped state