JPH07100461B2 - Crawler traveling device for work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to various agricultural work vehicles including a combine,
The present invention relates to a crawler traveling device having a function of adjusting a machine body height and a machine body lateral inclination in a work vehicle such as a carrier vehicle and a woodworking machine.

[Conventional technology]

Conventionally, as a means for lifting the aircraft to a desired level on the ground surface when the aircraft sinks in soft ground, and for maintaining the aircraft horizontally on sloping ground and ups and downs, for example
As disclosed in JP-A-176714 [Prior Art 1], a drive wheel of a crawler traveling device is provided in a position-fixed state on a machine body frame side, and a support frame having idle wheels for crawler belt winding guide is provided. Attached to the machine frame via front and rear swing links so as to be able to move up and down with respect to the machine frame, connect a hydraulic cylinder that swings and drives the swing links to the machine frame, and supports the support frame relative to the machine frame. There is known a structure in which the swing link is swung in a region below horizontal so that the support frame moves toward the drive wheel body as it lowers.

A similar construction is shown in US Pat. No. 3,658,146 [Prior Art 2].

Further, as a structure similar to the crawler traveling device of the present invention, as shown in Japanese Patent Publication No. S51-35004 [Prior Art 3], a support frame provided with a free wheel group including a tension wheel. It is also known that this is attached to a machine body frame via front and rear swing links, and this support frame is configured to be capable of being elastically raised and lowered relative to the machine body frame.

[Problems to be Solved by the Invention]

In the above-mentioned conventional technique 1 (No. Shokai 58-176714), when the support frame descends relative to the machine body frame, the crawler belt winding path length in the wheel group becomes larger than that before the movement, so that the tension wheel is It is necessary to displace to the drive wheel side, and in such a case, it is general to configure the tension structure in which the tension wheel provided on the machine body frame side is biased.

However, if an automatic tension type tension wheel is provided on the machine frame side in this way, it is certain that the tension wheel will automatically move in response to the lifting and lowering of the support frame with respect to the machine frame, and the crawler belt winding path length will be reduced. Although it is maintained constant, the tensioning force changes as the tension wheel moves, and the tension of the crawler belt changes. In this case, if the reference tension is set too high, excessive tension will be generated when the support frame is lowered relative to the machine frame, which will reduce the durability of the crawler belt and increase the driving load. When the tension is low, the tension is unduly low when the support frame is relatively raised with respect to the machine frame, and wheel slippage easily occurs.

Further, in the above-mentioned publicly known example, the tensioning force of the tension wheel of the automatic tension type is not changed so much regardless of the relative elevation of the support frame with respect to the machine frame,
A structure has been proposed and disclosed in which the tension of the crawler belt is made almost constant, but in order to avoid derailment in response to fluctuations of the crawler belt due to relative elevation, an automatic tension structure applies a considerably large tension to the crawler belt. If the crawler belt is made of rubber to improve riding comfort and avoid damage to the road surface when driving on public roads, the crawler belt stretches due to the large tension that is constantly applied. Is expected to be shortened and the life of the rubber crawler belt will be shortened.

Further, the above-mentioned prior art 2 (US Pat. No. 3,658,146) has a structure in which all the rolling wheels other than the drive wheels are provided on the side of the support frame which moves up and down relative to the body frame, but when the support frame moves up and down. In order to absorb changes in the crawler belt winding path length, an automatic tension structure is adopted in which the tension roller provided on the support frame is elastically biased.

Therefore, also in the prior art 2, the tension of the crawler belt by the automatic tension type tension wheel fluctuates due to the relative elevation of the support frame with respect to the machine body frame, and in this case too, excessive tension is generated depending on how the reference tension is set. It can be easily inferred that the above-mentioned inconvenience such as the occurrence of wheel slippage or the tendency of wheel derailment occurs. It is also expected that the crawler belt may be stretched due to the large tension constantly applied to shorten the life, as described above.

Further, in the above-mentioned prior art 3 (Japanese Patent Publication No. 51-35004), it is taken into consideration that the tension of the crawler belt does not fluctuate significantly even if the support frame moves up and down relative to the machine frame, but this crawler traveling device is good. It is only proposed as a vehicle with a running shock absorption function and does not have a function to adjust the aircraft attitude, and adjust the height of the left and right crawler traveling devices by the same amount to adjust the aircraft height. In addition, it is not possible to make adjustments such as making a difference in the height of the left and right crawler traveling devices to correct the lateral inclination of the machine body, which is not a technology that can be used as a traveling device for work vehicles.

The present invention has been made in view of such a point, and in consideration of improvement of riding comfort and road surface protection, the crawler belt is made of rubber to construct a crawler traveling device for a working vehicle. Even if the frame is moved up and down relative to the machine body, it prevents excessive tension and unreasonable slack in the rubber crawler belt, and prevents damage and damage to the crawler belt and derailment. An object of the present invention is to provide a crawler traveling device suitable for traveling while maintaining a stable body on a soft work site or a work site with a lot of ups and downs.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is characterized in that, in a crawler traveling device disposed on the left and right of the traveling machine body, the crawler driving wheels of each crawler traveling device are fixedly positioned on the machine body frame side, and crawler belt winding is performed. A support frame provided with idler wheels for turning guides is attached to the machine body frame via front and rear first swing links so as to be able to move up and down with respect to the machine body frame, and is swingable integrally with the first swing link. A hydraulic cylinder that extends the second swing link upward and drives the second swing link to swing is provided in the machine body frame, and the support frame is lowered as the support frame descends relative to the machine body frame. The first swing link is configured to swing in a region lower than the horizontal so as to move toward the drive wheel body, and the crawler belt is made of rubber. The idler wheel provided at the end of the support frame on the side opposite to the side is configured to adjust the tension of the crawler belt by adjusting and fixing the front and rear positions, and integrally with the support frame in the adjusted and fixed state. The point is that it is configured to move.

[Action]

As shown in FIG. 2 of the embodiment, when the supporting frame is moved downward from the ascending state in which it is close to the body frame,
Although the distance between the idler wheel for the front crawler grounding part provided on the support frame and the crawler drive wheel body increases, the entire support frame approaches the crawler drive wheel side and adjusts with the crawler drive wheel body. Since the distance from the fixed tension wheel is shortened, the crawler belt winding path length when the support frame is lowered relative to the machine frame is substantially the same as that before the descent.

In this case, it is difficult to completely reduce the change in the crawler belt winding path length due to the relative vertical position change of the support frame, but a slight change in the path length uses the elasticity of the crawler belt itself. It will correspond to absorption.

〔The invention's effect〕

As described above, the present invention has the following effects.

The idler wheel, which adjusts the tension of the crawler belt, is maintained in a position-adjusted fixed state and is configured to move up and down relative to the machine frame together with the support frame, and the support frame is moved up and down relative to the machine frame. Despite the fact that the crawler belt wrapping path length can be kept almost constant at all times, there is no large change in tension due to the relative elevation of the support frame, which occurs with the automatic tension structure. It has become possible to prevent damage and damage to the crawler belt by eliminating the occurrence thereof, and also to effectively prevent the occurrence of derailment by eliminating unreasonable slack in the crawler belt.

In addition, since the automatic tension structure that constantly applies a large tension force is not adopted, it is possible to suppress the early elongation of the rubber crawler belt, which is seen in the automatic tension structure, and to prolong the life of the crawler belt. Became.

This makes it possible to adjust the height of the rubber crawler and the tilt of the lateral crawler in a smooth and stable manner while keeping the circumferential length of the rubber crawler belt substantially constant without adversely affecting the crawler belt and the crawler running. became.

〔Example〕

As shown in FIG. 3, a pair of left and right crawler traveling devices (1) and (1) are provided, and a planting culm is raised and mowed at the front part of the traveling machine equipped with the threshing device (3). A combiner is configured by providing a pretreatment device (4) for supplying the cut grain culm to the threshing device (3).

Since the left and right crawler traveling devices (1) and (1) have the same structure, the left crawler traveling device (1) will be described below.
Will be described only.

As shown in FIGS. 1 and 2, a crawler drive wheel (5) attached to a machine body frame (2) constituting the machine body via a transmission case (10), and a machine body frame (2) described later. A plurality of idler wheels for crawler grounding part (7) attached to a support frame (6) connected through an oscillating link mechanism (11) and an idler wheel for crawler tension (8). A crawler belt (9) made of rubber is wound, and the crawler driving wheel (5) is driven by the power from the transmission case (10) to drive the crawler belt (9).

The swing link mechanism (11) includes a pair of front and rear first swing links (11a) and (11b) and a sub swing link (20). The support frame (6) is connected to the free ends of the front and rear pair of first swing links (11a) and (11b), respectively, and the pair of first swing links (11a) and (11b) is connected. The hydraulic cylinder (14) is interlocked with the hydraulic cylinder (14) as a drive mechanism.
The support frame (6) can be moved up and down. The hydraulic cylinders (14) are arranged on the left and right so that the right support frame (6) can be similarly moved up and down. The hydraulic cylinders (14), (14)
By operating each of them individually, the inclination and height of the machine body with respect to the traveling ground can be adjusted.

More specifically, of the second swing links (12), (12) pivotally attached to the body frame (2) so as to swing integrally with the first swing links (11a), (11b). The free ends are interlockingly connected by a rod (13), and the piston rod (14a) of the hydraulic cylinder (14) is connected to the second swinging link (12) on the rear side. )
To swing the pair of front and rear first swing links (11a) and (11b) through the second swing links (12) and (12).
With this swing, the support frame (6) moves up and down with respect to the body frame (2) while moving toward the crawler driving wheel (5) as the support frame (6) descends with respect to the body frame (2). is there.

Then, as the supporting frame (6) is lowered, the supporting frame (6) moves toward the crawler driving wheel body (5) side. Therefore, regardless of whether the supporting frame (6) is lifted or lowered, all the wheel bodies (5), (7).
., The length of the crawler belt (9) wound around (8),
In addition, the degree of tension does not change, or does not change much before and after the raising and lowering.

In addition, (15) in FIG. 2 is an idle wheel, and a support arm (16) for supporting this idle wheel (15) is vertically swingable around the horizontal axis and attached to the descending side. It is provided in a urged state.

Further, in FIG. 1 and FIG. 2, (17) is a screw shaft for adjusting the tension of the crawler belt (9), and a rotary operation part (17a) provided on the screw shaft (17) is provided. By operating the slide frame (18) having the idler wheel (8) for tensioning the crawler with respect to the support frame (6), the crawler belt (9) is extended and contracted.
The tension is adjusted and fixed. Further, the sub swing link (20) is the first swing link (11a), (11
It prevents twisting due to assembly error in b).

As shown in FIG. 2, cushion rubbers (19) and (19) are provided on the front and rear upper surfaces of the support frame (6). The cushion rubbers (19) and (19) are provided on the support frame. When (6) is raised, the first swing link (11
a) and (11b) are contacted with the fulcrum bosses from below to buffer the uppermost position of the support frame (6) so that the support frame (6) is restrained, and the support frame (6) is raised to the maximum during running. The traveling vibration is suppressed from being transmitted to the body frame (2).

INDUSTRIAL APPLICABILITY The present invention can be applied not only to combine harvesters, but also to various work vehicles including a crawler traveling device such as a transport vehicle and a woodworking machine.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a crawler traveling device for a work vehicle according to the present invention. Fig. 1 is a cutaway plan view of the crawler traveling device, Fig. 2 is a side view of the crawler traveling device, and Fig. 3 is a side view of the entire combine. It is a figure. (1) ... Crawler traveling device, (2) ... Machine frame, (5) ... Crawler drive wheel, (6) ... Support frame, (7), (8) ... Crawler belt winding guide Wheel, (11a), (11b) ... 1st swing link, (1
2) …… Second swing link, (14) …… hydraulic cylinder.

Claims (1)

[Claims] 1. In a crawler traveling device (1) arranged on the left and right of a traveling machine body, a crawler driving wheel (5) of each crawler traveling device (1).
The support frame (6) provided with the idler wheels (7) and (8) for guiding the crawler belt winding can be lifted up and down with respect to the body frame (2) Attached to the machine body frame (2) via the front and rear first swing links (11a) and (11b), and the second swing link (12) is swingable integrally with the first swing link (11b). And a hydraulic cylinder (14) for swinging and driving the second swing link (12) is connected to the body frame (2), and the support frame (6) is connected to the body frame (2). The support frame (6) moves toward the drive wheel body (5) side as it descends relative to the first frame.
The swing links (11a) and (11b) are configured to swing in a region lower than the horizontal, and the crawler belt (9) is made of rubber, and on the side opposite to the side where the drive wheel body (5) is installed. The idle wheel (8) provided at the end of the support frame (6) is configured to adjust the tension of the crawler belt (9) by adjusting and fixing the front and rear positions, and the support is maintained in the adjusted and fixed state. A crawler traveling device for a work vehicle, characterized in that it is configured to move integrally with a frame (6) and is capable of adjusting the height of the machine body and the inclination of the machine body left and right.