JPH0597072A - Crawler type running device - Google Patents

Abstract

PURPOSE:To reliably cope with the slack of a crawler throughout a wide range by a method wherein a stretch rolling wheel at the rear part of a cralwer is pivotally mounted on the one end of a rod, the rod is forced into an externally stretched through the force of a pressure stretch spring, and the other end of the pressure stretch spring is stretched by means of a jack. CONSTITUTION:A crawler 3 is run around and between a drive sprocket 1 and a stretch rolling wheel 2 and central rolling wheels 4, 4', and 4'' are brought into a vertically regulatable state and arranged in a stretched downward state, and front rolling wheels 5 and 5' and rear rolling wheels 6 and 6' are supported to rocking arms 7 by means of bearings. The stretch rolling wheel 2 is mounted on the one end of the rod 9, slidably arranged internally of a guide cylinder 8, by means of bearings, the rod 9 is stretched outward through the force of the pressure stretch spring 10, and the other end of the pressure stretch spring 10 is stretchable by means of a hydraulic jack 11. The rolling wheels 4..., 5..., and 6... are supported to the outer peripheral part of the guide cylinder 8. The stretch rolling wheel 2 stretches the crawler 3 through the pressure stretch springs 10 and the rod 9 by operating the hydraulic jack 11, i.e. a plunger pump 24, when the crawler 3 is slacked.

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, SAIkai Sho 58
The idle wheel shock absorber for a tracked vehicle described in Japanese Unexamined Patent Publication No. 98287 is provided with an idle wheel attached to one end of a fork, and a guide fixed to the other end of the fork to provide one side in the axial direction. Has a stepped lot formed with a sliding portion that allows the guide to slide within a certain range and a spring receiving portion on the other side, and the guide is slidable on the stepped lot. A spring is stretched between the spring receiving portion and the guide, and position regulating means for the stepped lot is provided on the other side of the stepped lot.

[0003]

[Problems to be Solved by the Invention]
La uses multiple central wheel groups in order to safely and reliably drive on rough roads, over ridges, and change direction (vehicle body turning), and without breaking the field scene as much as possible when turning. It has a configuration that allows vertical movement adjustment. With such a structure, the crawler is inevitably required to expand and contract over a wide range, and if it is not taken into consideration, it cannot be a smooth running and highly durable traveling device.

In particular, the structure according to the present invention is intended to realize a device which is easy to operate for adjusting the movement of the tension roller depending on the expansion and contraction and which is durable and does not overload the crawler. To do. Further, each of the rolling wheels has a structure in which the supporting structure thereof is centrally supported by the guide tube of the tensioned rolling wheel so that the structure is simply summarized.

[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
And a plurality of central rollers 4, 4'for guiding the lower part of the intermediate part of the crawler 3 around the crawler 3,
4 "is provided integrally with the central rolling wheels 4, 4 ', 4" by freely adjusting the vertical movement and tensioning downward, and a pair of front rolling wheels 5, 5'provided on the front side and the rear side of the central rolling wheels 4, 4', 4 ', respectively. Rear wheel 6,
6'is a swinging arm which is swingable with the middle portion as a fulcrum a.
The tension roller 2 is mounted on a bearing 7, and the tension roller 2 is axially attached to one end of a lot 9 which is slidably mounted on a guide cylinder 8 and the lot 9 is tensioned outward by a tension spring 10. , The other end of the tension spring 10 to the hydraulic jack 1
1 is a crawl-type traveling device which is constructed so as to be capable of being tensioned and which supports the above-mentioned respective rolling wheels 4, ..., 5 ..., 6 on the outer peripheral portion of the guide cylinder 5.

[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 13 provided in the front portion of a chassis 12 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 or braking can be applied.

The tension roller 2 is supported by the end of a lot 9 which is slidably mounted in a guide cylinder 8. The lot 9 is structured such that it is pressed by the tension spring 10 in the axial direction to move, but is engaged by a spline so that it cannot rotate. 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 wheels 4, 4 ', 4 "are arranged inside the intermediate portion of the crawler 3 by bearings on the connecting body 14, and are supported by a connecting rod 15 provided at the axial center of the wheels 4'. The connecting rod 15 is bent in a dogleg shape to pivotally connect the middle portion to the guide cylinder 8 and to connect the hydraulic cylinder 16 to the other end so that the connecting rod 15 can swing. , Hydraulic cylinder 1
6 is a switching valve 17 shown in the hydraulic circuit of FIG.
The connecting body 14 is extended by the pressure oil so that the connecting body 14 can be moved downward, but on the contracted side, the oil can be returned to the tank so that it can be freely contracted.

The connecting rod 15 is provided with a buffer spring 18
Supported by the central rollers 4, 4'4 "on the front wheels 5,
5'and the rear wheels 6,6 'are tensioned downward to maintain the same level. Therefore, the central wheel 4,
4 ′, 4 ″ can be moved below the front wheels 5, 5 ′ and the rear wheels 6, 6 ′ by the operation of the hydraulic cylinder 16, and when the switching valve 17 is set to neutral, the oil returns to the tank. It is configured to receive the action of the buffer spring 18.

As shown in FIG. 3, the hydraulic cylinder 16 and the buffer spring 18 are arranged on both sides of the guide cylinder 8 and accommodated within the width of the crawler 3. The front wheels 5, 5 ′ are formed in a V shape and the middle portion is the guide tube 8
The rocking arm 7 pivotally attached to the hydraulic jack 11 (in the embodiment) is pivotally attached to both ends of the rocking arm 7 to form a rocking-free bogie type.

Next, as with the front wheels 5 and 5 ', the rear wheels 6 and 6'include a hessian swing arm 7 having an intermediate portion pivotally attached to the guide tube 8 at both ends. Bogies that are pivotally attached to the shaft
The crawler 3 operates the power steering lever 19 in the cockpit to disengage one side clutch, and when the side brake is continuously applied, the braking force interlocks with it. The hydraulic cylinder 16 on the side of the central wheels 4, 4 ', 4 "of the working crawler 3 can be extended.

In the combine shown in the embodiment, a threshing machine 20 is mounted on a chassis 12 and a cutting and conveying frame 21 is attached to a front part thereof so as to be vertically rotatable. The hydraulic jack 11 for pressing the tension spring 10 is connected to the terminal end of the guide cylinder 8, the pressure chamber 22 has an outer circumference as an oil chamber 23, and the plunger pump 24 is connected to the side portion. ..

Therefore, in the hydraulic jack 11, the lever is inserted into the support portion 25 on the outer side and the plunger pump 2 is provided.
4 is operated, the oil flows through the passage 26 into the pressure chamber 22 according to the arrow and pushes the pressing rod 27 to push the tension spring 10. 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 12.
Then, the grain culms in the field are mowed by the mowing device provided in 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 land, the central wheels 4, 4 ', 4 "are connected to the connecting body 14,
While being buffered by the buffer spring 18 via the connecting rod 15, it is pressed downward while maintaining the same level as the front and rear wheels 5, 5 ', 6, 6'. Therefore, the crawler 3 has a long ground contact area and can be stably propelled.

Next, the crawler 3 is provided with front wheels 5 and 5'and rear wheels 6 when overcoming a small and high portion such as a ridge.
Since each 6'has a bogie structure, it can adapt to the surface of the ridge and travel safely and securely. Explaining the case of turning, one side clutch is disengaged by the operation of the power steering lever 19 and the side brake is applied by continuing the operation to give a braking action to the crawler 3.

Then, in the crawler 3, the switching valve 17 of the hydraulic cylinder 16 on the side where the braking action is working is switched to the oil feeding side, and the cylinder 16 is extended. Along with that, the roller 3 is pushed down from the front and rear wheels 5, 5'6, 6'through the connecting rod 15 and the connecting body 14 so that the grounding portion is provided. The central wheels 4, 4 ',
Only the 4 "part.

Therefore, the crawler 3 can turn the chassis 12 on the braking side without pushing down the soil so that the surface of the field is not destroyed and the horsepower consumption is low. Then, the hydraulic cylinder 16 and the buffer spring 1
Since No. 8 is configured so as to be positioned within the width of the crawler 3 as in the embodiment shown in FIG. 3, it has a feature that splashing mud is less involved and corrosion and the like can be reduced.

During the above operation, the tension roller 2
The oil in the pressure chamber 22 and the tension spring 10 elastically tension the crawler 3 to absorb the expansion and contraction of the crawler 3 to facilitate smooth running. Then, when the crawler 3 extends, the tension roller 2 has hydraulic jacks 11,
That is, the plunger pump 24 can be operated to move outward through the pressing rod 27, the tension spring 10, and the lot 9, so that the crawler 3 can be tensioned.

[0020]

As described above, the black of the present invention is used.
The rotor is wound around one drive sprocket and the other tension roller, and a plurality of central rollers that guide the lower part of the intermediate portion of the crawler are freely adjusted to move vertically and tension is applied downward.
By constructing a pair of front and rear wheels provided on the front side and the rear side of the central roller, respectively, in a swingable bogie type with the intermediate portion of the swing arm as a fulcrum. When it is possible to safely, reliably, and smoothly perform traveling on rough roads, overrunning, turning, etc., the crawler is required to have an extremely wide range of expansion and contraction.

Therefore, the present invention has a feature that it can be surely adapted to a wide range of extension of the crawler and that smooth running is always possible.

[Brief description of drawings]

FIG. 1 is a side sectional view of an essential part of an embodiment of the present invention.

FIG. 2 is a side view of a main part according to the embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of the embodiment of the present invention.

FIG. 4 is a block circuit diagram showing an embodiment of the present invention.

FIG. 5 is a hydraulic circuit diagram according to the embodiment of the present invention.

FIG. 6 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, 4 ', 4 "Central wheel 5, 5' Front wheel 6, 6 'Rear wheel 7 Swing arm 8
Guide tube 9 lot 10 tension spring 11
Hydraulic jack

Claims (1)

[Claims] 1. A crawler 3 is wound around a drive sprocket 1 on one side and a tension roller 2 on the other side, and a plurality of central rollers for guiding the lower part of an intermediate portion of the crawler 3 are provided. Ring 4,
4'and 4 "are integrally provided so as to be vertically adjustable and tensioned downward, and a pair of front rollers 5 are provided on the front side and the rear side of the central rollers 4, 4 ', 4", respectively. 5'and rear wheels 6 and 6'are provided by bearing on a swing arm 7 which is freely swingable with an intermediate portion as a fulcrum a, and the tension roller 2 is slidable on a guide cylinder 8. The lot 9 installed inside is axially attached to one end, the lot 9 is tensioned outward by a tension spring 10, and the other end of the tension spring 10 is tensionable by a hydraulic jack 11. Crawler type traveling device in which each of the above-mentioned rolling wheels 4, ..., 6 ... Is supported on the outer peripheral portion of the cylinder 5.