JPH085910Y2 - Crawler traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a crawler traveling device mainly used for a work vehicle that works on a soft ground.

[Conventional technology]

In the above-mentioned crawler traveling device, conventionally, for example
As disclosed in Japanese Patent Laid-Open No. 58-186978, there is a hydraulic cylinder in which the rear side of the track frame is lowered with respect to the machine body.

[Problems to be solved by the device]

The above-mentioned reference is for driving the hydraulic cylinder to return the posture of the machine body tilted backward to the horizontal to improve the traveling performance and workability. In order to move it with respect to it, an elevating structure with high rigidity is required, and there is a problem that the manufacturing cost becomes high.

An object of the present invention is to control the attitude of the machine body in the front-rear direction using a simpler device.

[Means for solving the problem]

A feature of the present invention is that among the plurality of rolling wheel groups that guide the crawler belt to the ground, the plurality of rolling wheels located in the front-rear center side can freely move up and down, and the rearmost rolling portion that can move up and down. The point is that an actuator is provided that can switch the wheel between a state in which the wheel can freely move up and down and a state in which the wheel protrudes downward from other rolling wheel groups.

[Action]

According to the above configuration, the movable wheel on the rear end side is projected downward by the actuator, whereby the machine body in the forward ascending posture is made horizontal, and the traveling performance of the machine body can be improved. Further, when the actuator is not operated, the movable wheels on the front and rear of the machine body cause the ridge to be overrun,
You can smoothly and safely cross the ridge.

[Effect of device]

Therefore, according to the present invention, it is possible to improve both the traveling performance of the aircraft and the safety at the time of climbing over ridges and ridges by using the movable wheel provided at the rear of the aircraft, and the structure is simple while traveling. It was possible to provide a crawler traveling device with high performance.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 4, a mowing pretreatment unit (A) for conveying the planted grain culms to the rear of the mowing is provided at the front of the traveling machine body in which the crawler traveling device (1) according to the present invention is provided in a pair on the left and right. In addition to the above, an all-culm throw-in type combine is configured by mounting a threshing device (B) for threshing while holding and transporting the harvested culm at the rear part of the traveling machine body.

As shown in FIG. 1, the crawler traveling device (1) is
A track frame (6) provided with a drive sprocket (2) at the front part and a crawler tensioning wheel body (3) at the rear part and connected to a vehicle body frame (4) via a parallel four-link mechanism (5) so as to be able to move up and down in parallel. ), A plurality of ground rollers (7) are arranged in parallel so that they can freely rotate, and these wheel bodies (2),
A crawler belt (8) is wound around (3) and (7).

As shown in FIGS. 1 and 2, the parallel quadruple link mechanism (5) has a horizontal axis at one end of a pair of front and rear fulcrum pins (10) rotatably supported by the vehicle body frame (4). The swinging arms (11) rotatable around (P ₁ ) are fixed respectively, and the swinging arm (11) on the front side is capable of swinging back and forth around the horizontal axis (P ₁ ) (12). ) Is pivotally connected to the track frame (6) and the rear swing arm (1
1) is pivotally connected to the track frame (6).

An operation arm (13) is fixed to the other ends of the pair of front and rear fulcrum pins (10), and a double-acting hydraulic cylinder extends between the rear operation arm (13) and the body frame (4). (15) is installed, and a link link (9) is installed across both operation arms (13).

 Next, the grounding wheel (7) will be described.

The grounding wheels (7a), (7a) on the foremost side and the rearmost side
Is of the outer wheel type and is supported by the track frame (6) in a fixed position. And 4 located in the middle of the front and back
The individual wheel bodies (7b) are respectively supported on both ends of a pair of front and rear swing members (14) and (16) pivotally supported on the track frame (6) so as to swing freely. And the swinging member (16) on the rear side
A hydraulic cylinder (17) (corresponding to an actuator) for driving and swinging is mounted on the body frame (4).

The drive mechanism of the rearmost wheel (7b) supported by the swing member (16) will be described. As shown in FIG. 3, the drive mechanism includes a hydraulic pump (P) to a hydraulic cylinder (17). The control valve (18) is installed in the oil passage,
By switching the control valve (18), it is possible to switch between the state in which the rearmost wheel (7b) is fixed at the position protruding downward and the state in which it can be moved up and down. (1) Rolling wheel at the rearmost part when driving in a wetland where the rear side sinks and becomes a downward slope (7b)
Is used by forcibly lowering, and the hydraulic cylinder (17) is freed to use the entire group of rolling wheels (7b) as movable rolling wheels when the ridges or ridges are crossed.

Note that the front and rear intermediate wheel (7b) may be a normal one-wheel type.

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

[Brief description of drawings]

The drawings show an embodiment of the crawler traveling device according to the present invention,
1 is a side view of the crawler traveling device, FIG. 2 is a partially cutaway cross-sectional plan view of the crawler traveling device, FIG. 3 is an explanatory view showing a drive mechanism of a hydraulic cylinder, and FIG. It is the whole side view of the culm throw type combine. (7b) …… Roller wheels, (8) …… Crawler belt, (17)…
... actuator.

Claims (1)

[Scope of utility model registration request] 1. A plurality of rolling wheels (7b) located on the front-rear center side of a group of a plurality of rolling wheels (7b) for guiding a crawler belt (8) to contact with the ground are configured to be freely movable up and down, A crawler traveling device provided with an actuator (17) capable of switching a movable rearmost rolling wheel (7b) between a state in which it can freely move up and down and a state in which it projects downward from other rolling wheel groups.