JPH0585397A - Crawler type running gear - Google Patents

Abstract

PURPOSE:To safely perform the over-levee movement from a field to the next field in the case where a crawler has been mounted on a combine. CONSTITUTION:A crawler type running gear, in which a crawler 3 is arranged so as to be wound around a driving sprocket 1 located in one side and a tension pulley 2 located in another side, and a pulley group 4 composed of, at least, three central pulleys, which guides a bottom of the intermediate part of the crawler 3, is arranged so as to move vertically as one body for giving downward pressure, respective pairs of a front pulley 5 and a rear pulley 6 provided at a front side and a rear side of the central pulley group 4 are constituted as a bogie type structure so as to rock about a middle part of a fixing arm 7 as a fulcrum (a), and the central pulley group 4 is supported by bearings so that its middle pulley 4b is arranged higher than its front and rear pulleys 4a and 4c.

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]

[Problems to be Solved by the Invention]
La is intended to drive on rough roads, over ridges, and to change direction (vehicle body turning) safely and surely, and at the same time as much as possible without destroying the field scene during turning. In particular, the crawler according to the present invention is intended to embody a device that, when mounted on a combine, can be safely operated when moving from one field to the next field.

[0004]

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
And a crawler 3 wound around the crawler, and at least three central rolling wheel groups 4 for guiding the lower part of the intermediate part of the crawler 3 are integrally provided so as to be freely adjustable in vertical movement and tensioned downward.
A pair of front and rear rolling wheels 5 and 6 provided on the front side and the rear side of the central rolling wheel group 4 are formed into a swingable bogie type with an intermediate portion of the mounting arm 7 as a fulcrum a. It is a crawler type traveling device in which the central rolling wheel group 4 is configured so that the intermediate rolling wheels are set higher than the front and rear rolling wheels.

[0005]

EXAMPLE First, the structure will be described. The drive sprocket 1 is configured to be driven by being supported by an axle 10 of a mission case 9 provided in a front portion of a chassis 8 as conventionally known, and although not shown, left and right side clutches provided inside, Connected to the side brakes, it has a structure that allows intermittent powering and braking on the left and right.

[0006] The tension roller 2 is a traveling frame 11 of the chassis 8.
It is provided at the rear of the car so that it can be moved back and forth. The crawler 3 is made of rubber as an endless belt and is wound around the drive sprocket 1 and the tension roller 2. The central rolling wheel group 4 includes three rolling wheels 4a, 4b, and 4c connected to one another.
2, the front and rear parts 4a and 4c are provided at positions lower than the intermediate part 4b.

The central wheel group 4 includes the crawlers 3
It is arranged inside the intermediate portion of and is supported by a swing arm 13 provided at the axis of the rolling wheel 4b. The swing arm 13 is bent in a dogleg shape, the intermediate portion is pivotally attached to the machine body, and the other end is connected to a hydraulic cylinder-14 so as to swing. Note that the hydraulic cylinder 14 extends like the switching valve 15 shown in the hydraulic circuit of FIG. 5 so that the connecting body 12 can be moved downward by the pressure oil, but the compression cylinder side is provided with oil so that it can be freely contracted. It is designed so that it can be returned to the tank.

The swing arm 13 is provided with a buffer spring 1
It is configured to be supported by 6 and to be tensioned downward so as to keep the central roller group 4 at the same level as the front roller 5 and the rear roller 6. Therefore, the central wheels 4a, 4b, 4c can be moved below the front wheels 5 and the rear wheels 6 by the operation of the hydraulic cylinder 14, and when the switching valve 15 is set to neutral, the oil returns to the tank. It is configured to receive the action of the buffer spring 15.

The arrangement of the hydraulic cylinder 14 and the buffer spring 16 is, as shown in FIG.
It is provided on both sides of the frame 11 and is housed within the width of the crawler 3. The front roller 5 is constructed in a swingable bogie type by pivoting a V-shaped mounting arm 7 having two rollers 5a and 5b axially attached to both ends to the machine body.

Next, as in the case of the front rolling wheel 5, the rear rolling wheel 6 pivotally mounts a V-shaped mounting arm 7 in which two rolling wheels 6a and 6b are axially attached to both ends of the body. The shock-absorbing buffer spring 16 which is swingable and has a bogie structure is capable of adjusting its tension. When the steering lever 17 is operated to disengage one of the side clutches and the side brake is continuously applied, the crawler 3 is linked to the center of the crawler 3 on which the braking force is working. The hydraulic cylinder 14 on the side of the rolling wheel group 4 is configured to be extendable.

In the combine shown in the embodiment, a thresher 18 is mounted on the chassis 9, and a cutting and conveying frame 19 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 8.

[0012] Then, the grain culms in the field are mowed by the mowing device provided in the mowing and conveying frame 19 at the front part, and are supplied to the threshing machine 18 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 rolling wheels 4a and 4c receive the cushioning action of the cushioning spring 16 via the connecting body 12 and the swing arm 13 and the front and rear rolling wheels 5 are provided. , 6 and are pressed downward while maintaining the same level.

Therefore, the crawler 3 has a long ground contact area and can be stably propelled. Next, the crawler 3 is adapted to the surface of the ridge so that the front wheel 5 and the rear wheel 6 can be driven safely and reliably when riding over small and high parts such as ridges. .

Particularly, in the structure of the present invention, the intermediate member 4b forming the central wheel group 4 is replaced with the front and rear members 4a, 4
Since it is arranged higher than c, when that part comes into contact with the ridge surface, the ridge is surely caught and the stability can be exceeded well. Next, the case of turning will be described. One side clutch is disengaged by operating the steering lever 17 and the operation is continued to apply side brake to apply a braking action to the crawler 3.

Then, in the crawler 3, the switching valve 15 of the hydraulic cylinder 14 on the braking side is switched to the oil feeding side, and the cylinder 14 is extended, so that the swing arm 13, Rolling wheel 4 through connecting body 12
a, 4b, 4c are pushed downward from the front and rear rollers 5, 6 so that the ground contact portion is only the portion of the central roller group 4. Therefore, the crawler 3 can turn the undercarriage 8 in a state in which the soil pushing is reduced and the surface of the field is not destroyed on the braking side, and the consumption horsepower is small.

Since the hydraulic cylinder 14 and the buffer spring 15 are arranged within the width of the crawler 3 as in the embodiment shown in FIG. 2, the splashing mud is less affected, It has the feature of reducing the occurrence of corrosion.

[0017]

As described above, the black of the present invention is used.
The roller is wound around the drive sprocket on one side and the tension roller on the other side, and a plurality of central rollers which guide the lower part of the middle part of the crawlers are vertically moved and freely adjusted downward. A pair of front wheels and rear wheels provided on the front side and the rear side of this central wheel group are tensioned to form a rocking-free bogie type with the intermediate portion of the mounting arm as a fulcrum. Therefore, it has a unique effect that it can safely, reliably, and smoothly drive on rough roads, overruns, turns, and the like.

In particular, the central wheel group is excellent in that it works effectively when the ridges are exceeded and can be safely moved from field to field.

[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 Central wheel group 5 Front wheel 6
Rear wheel 7 Mounting arm

Claims (1)

[Claims] 1. A sprocket 1 on one side and a tension roller 2 on the other side are provided with a crawler 3 wound around them, and at least three central rollers which guide the lower part of the intermediate portion of the crawler 3. The group 4 is integrally provided so as to be freely adjustable in vertical movement and is tensioned downward. A pair of front and rear rolling wheels 5 and 6 provided on the front side and the rear side of the central rolling wheel group 4 are attached to each other. -The center portion of the center wheel group 4 is formed from the front and rear rollers 4a, 4c to the middle roller 4b by using the intermediate portion of the frame 7 as a fulcrum a to swing freely.
Crawler type traveling device with high bearing