JPH0640358A - Crawler type travel device - Google Patents

Abstract

PURPOSE:To manufacture a crawler guide which can engage and guide a crawler reliably even if central rolling wheels move vertically. CONSTITUTION:A crawler type travel device is constituted in such a way that a crawler 3 is wound between one driving sprocket 1 and another rolling wheel 2, and a plurality of central rolling wheels 4a, 4b and 4c to guide a lower inner peripheral surface of an intermediate part of the crawler 3, are supported pivotally by a connecting body 5 arranged so as to capable of adjusting vertical movement freely, and are made to serve as a crawler guide to guide the lower end of the connecting body 5 while being engaged with a central groove of the crawler 3, and a pair of respective front part rolling wheels 8 and 8' and rear part rolling wheels 9 and 9' arranged on the front side and the rear side of the crawler guide 7 are formed in a bogie type capable of swinging freely with an intermediate part of an installing arm 10 as its fulcrum (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawl-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, Japanese Patent Laid-Open No. 63-63.
According to the configuration described in Japanese Patent Laid-Open No. 321273/1998, a plurality of outer wheels that hang a crawler belt having two protrusions on its inner peripheral surface in contact with the outside of the protrusions and an inner peripheral surface of a grounding portion of the crawler belt. And a crow roller guide located between the two protrusions, and the outer wheel located at the center of the ground contact portion of the crawler belt of the plurality of outer wheels is a movable wheel that is movable in the vertical direction. A tracked vehicle in which the movable wheel is sometimes moved downward to press the center of the grounding portion of the crawler belt, wherein the crawler guide is formed in two at the center of the grounding portion of the crawler belt, and A tracked vehicle provided with a crawler guide interlocking means for interlocking the movable roller side end of the rail guide with the movable roller.

[0003]

In the structure in which the movable roller for pushing down the crawler is mounted on the central portion of the crawler, the crawler is easily disengaged with the upper and lower sides of the movable roller. The guide function cannot be fully exerted unless the crawler guide moves up and down. In the above-mentioned conventional type, the center portion of the folded crawler guide is moved up and down together with the movable roller to exert its function.

However, when there are a plurality of movable wheels, a complicated structure is required in which a crawler guide must be provided separately from the member for supporting each wheel.

[0005]

The present invention takes the following technical means in order to achieve the above object. That is, one drive sprocket 1 and the other tension roller 2
A plurality of central rollers 4a, 4a, 4b,
b and 4c are axially mounted on a connecting body 5 which is freely adjustable in vertical movement, and a crawler guide 7 for engaging and guiding the lower edge of the connecting body 5 with the central groove 6 of the crawler 3 is provided. A pair of front rolling wheels 8 and 8'and rear rolling wheels 9 and 9'provided on the front side and the rear side of the crawl guide 7 are used as the fulcrum a at the intermediate portion of the mounting arm 10. It is a crawler-type traveling device having a bogie type that can freely swing.

[0006]

EXAMPLE First, the structure will be described. The drive sprocket 1 is configured to be driven by bearings on an axle of a mission case 12 provided in the front portion of a chassis 11 as is conventionally known. Although not shown, left and right side clutches and side brakes provided inside are provided. -Connected to the key, the left and right power can be turned on and off individually and braking can be applied.

The tension roller 2 is a traveling frame 1 of the chassis 11.
It is provided at the rear of 3 so that it can be moved back and forth. And black
The la 3 is made of rubber and has a central groove 6 formed along the inner side of the central portion to form an endless belt shape, which is wound around the drive sprocket 1 and the tension roller 2.

The central rollers 4a, 4b, 4c are arranged on the inner peripheral surface of the intermediate portion of the crawler 3 by bearing on the connecting body 5.
It is supported by a swing arm 14 provided at the axis of the wheel 4b.
The swing arm 14 is bent in a dogleg shape, the intermediate portion is pivotally attached to the machine body, and the hydraulic cylinder 15 is connected to the other end so as to swing. The hydraulic cylinder 15 extends like the switching valve 16 shown in the hydraulic circuit diagram of FIG. 4 so that the connecting body 5 can be moved downward by the pressure oil.
Neutral so that you can freely shrink on the shrink side,
Oil is always returned to the tank.

The swing arm 14 is provided with a buffer spring 1
7 and the switching valve 16 is in the neutral state, the central wheels 4a, 4b, 4c are connected to the front wheels 8,
8'and the rear wheels 9,9 'are tensioned downward to maintain the same level. The connecting body 5 has the central rollers 4a, 4b, and 4c mounted on the shaft as described above, and the lower edge of the connecting body 5 is fitted in the central groove 6 of the crawler 3. It has become.

The front wheels 8'and 8'are formed in a V-shape, and the middle portion of the front wheels 8'and 8'is pivotally mounted on both ends of a mounting arm 10 pivotally mounted on the machine body. -It is configured as a formula.
Similarly, the rear wheels 9 and 9 ', like the above-mentioned front wheels 8 and 8', are pivotally attached to both ends of the heveoidal mounting arm 10 pivotally attached to the machine body. The crawler 3 is a power steering lever-1 in the cockpit.
8 is operated to disengage one of the side clutches, and when the side brake is continuously applied, the central cylinders 4a, 4b, 4c side hydraulic cylinders of the crawler 3 on the braking force side are interlocked with it. The structure is such that 15 can be extended.

In the combine shown in the embodiment, a thresher 19 is mounted on a chassis 11 and a cutting and conveying frame 20 is attached to a front part thereof so as to be vertically rotatable. A crawler guide 7 in another embodiment shown in FIG. 7 has a base portion pivotally mounted on a mounting shaft 21 provided on the traveling frame 13, and a tip edge thereof is fitted into a central groove 6 of the crawler 3, and a spring 22 is provided. It is constructed by applying a tension pressure to the chlora 3 side.

The rolling wheel 23 is mounted on the above-mentioned crawler guide 7. 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 moves the drive sprocket 1
Is driven to propel the chassis 11. Then, the grain culms in the field are mowed by the mowing device provided in the mowing and conveying frame 20 at the front part, and are supplied to the threshing machine 19 by the conveying device to be subjected to 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 wheels 4a, 4b, 4c are connected to the connecting body 5,
While being buffered by the buffer spring 17 via the swing arm 14, the front and rear rollers 8, 8 ', 9, 9'are kept at the same level and are pressed downward.

Therefore, the crawler 3 has a long ground contact area and can be stably propelled. Next, in case of overcoming a small and high portion such as a ridge, the chlora 3 has a front wheel 8 and 8'and a rear wheel 9 and 9 ', respectively.
Because it is structured like a formula, it can adapt to the surface of the ridge and drive safely.

Even during the traveling as described above, the crawler guide 7 is kept fitted in the central groove 6 of the crawler 3 to prevent the crawler 3 from coming off and to guide the crawler 3 reliably. . Next, the case of turning the chassis 11 will be described.
One side clutch is disengaged by the operation of the steering lever 18 and the operation is continued to apply a side brake to give a braking action to the crawler 3.

Then, in the crawler 3, the switching valve 16 of the hydraulic cylinder 15 on the braking side is switched to the oil feeding side so that the cylinder extends. Along with that,
The crawler 3 is provided with a rolling wheel 4 via a swing arm 14 and a connecting body 5.
a, 4b, 4c are pushed downward from the front and rear rollers 8, 8 ', 9, 9', so that the ground contact portion has its center wheels 4a, 4b,
Only the portion 4c is provided.

Therefore, on the braking side, the crawler 3 can turn the chassis 9 in a state where the pushing of the soil is reduced and the surface of the field is not destroyed, and the consumed horsepower is small. Even when the chassis 11 is turning like this, the
The raguide 7 moves integrally with the central rollers 4a4b, 4c, so that it can be guided without being separated from the central groove of the crawler 3.

[0018]

As described above, in the device according to the present invention, since the connecting body for axially mounting the vertically moving central rolling wheel is used as the crawler guide, the central rolling wheel pushes down the crawler to move it up and down. Even if you move to, you will not lose the crawler guide function. Therefore, the crawler has a characteristic that it can be stably run with almost no separation.

[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 cutaway plan view of a main part of the embodiment of the present invention.

FIG. 3 is a sectional plan view taken along the line SS of FIG.

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

FIG. 5 is a block circuit diagram showing an embodiment of the present invention.

FIG. 6 is a side view of the combine according to the embodiment of the present invention.

FIG. 7 is a cut front view showing another embodiment of the present invention.

[Explanation of symbols]

1 Drive sprocket 2 Tension roller 3
Crawler 4a, 4b, 4c Central rolling wheel 5 Connected body 6 Central groove 7 Crawler guide 8, 8'Front rolling wheel 9, 9'Rear rolling wheel
10 Mounting arm a Support point

Claims (1)

[Claims] 1. A plurality of central portions for guiding a lower inner peripheral surface of an intermediate portion of the crawler 3 by winding a crawler 3 around one drive sprocket 1 and the other tension roller 2. Rolling wheel 4
Crawler guides a, 4b, 4c are provided by being axially mounted on a connecting body 5 freely adjustable in vertical movement, and a lower edge of the connecting body 5 is engaged with and guided by a central groove 6 of the crawler 3. 7, a pair of front wheels 8 and 8'and rear wheels 9 and 9'provided on the front side and the rear side of the crawler guide 7 are attached, respectively, and an intermediate portion of the arm 10 is used as a fulcrum. A crawler type traveling device having a swingable bogie type as a