JPH0674061B2 - Crawler traveling device for work vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a crawler traveling device used for a working vehicle such as a combine, a transport vehicle, and an earthmoving machine. More specifically, the drive wheel of the crawler traveling device has a body frame. A supporting frame provided with a crocodile and equipped with idle wheels for guiding the crawler belt is connected to the machine frame via a rocking link mechanism so that it can be raised and lowered with respect to the machine frame, and the rocking link mechanism is rocked. The present invention relates to a crawler traveling device for a work vehicle provided with a drive mechanism for moving the work vehicle.

[Conventional technology]

The crawler traveling device with the above-mentioned configuration lifts the aircraft to a desired level on the ground surface when the aircraft sinks in soft ground, or when the aircraft tilts to the left or right, adjusts the left and right traveling devices to level the aircraft. It can be maintained at the same time, and an example thereof is shown in Japanese Utility Model Publication No. 48-38651.

[Problems to be Solved by the Invention]

However, the above-mentioned known techniques have drawbacks such as durability of the crawler belt and resistance to derailing, and it has been difficult to put them into practical use as they are.

That is, in the above-mentioned known technique, an automatic crawler tension wheel that is spring-biased is attached to the machine body frame side, and the automatic crawler tension wheel is elastically moved back and forth in response to lifting and lowering of the crawler belt on the ground contact side. Therefore, the tension of the crawler belt fluctuates greatly as the crawler belt grounding side moves up and down with respect to the machine frame, and if the reference tension is set too much, the crawler belt grounding side will be excessive when descending with respect to the machine body. If the crawler belt is overloaded or the running load increases due to tension, and if the reference tension is small, the tension becomes extremely small when the crawler belt ground contact side rises against the machine body The reference spring urging force of the automatic crawler tension wheel, that is, the reference tension of the crawler belt, can be used for both the durability and the wheel removal resistance of the crawler belt. Had to be set to insufficient value be.

By the way, in recent years, in a crawler traveling device, as disclosed in, for example, Japanese Utility Model Laid-Open No. 61-3179, a movable roll that can move up and down is provided at an intermediate position in the front and rear of a track frame having a group of idler wheels for guiding a crawler belt. When the vehicle is equipped with wheels and runs on uneven work areas, when crossing fields, or when loading or unloading a truck from a loading platform, the bumps and corners of the running surface reach the front and rear intermediate parts of the crawler running device. By bending the front and rear intermediate parts of the crawler belt upward as the movable wheels escape upward, the ridges and corners can be smoothly and safely passed with little back and forth swing of the machine body. Is being developed.

Therefore, it is expected that the traveling performance will be further improved by introducing the practically useful movable wheel into the crawler traveling device having the above-mentioned configuration. In this case, if the movable roller is introduced into the configuration of the known example, if the reference tension of the automatic crawler tension is large, it is difficult to bend the movable roller upward while the movable roller is moving upward, and the crawler belt is difficult to bend. However, if the reference tension is small, the crawler belt is easily bent, and when the front and back of the crawler traveling device approaches the recess of the traveling surface, the crawler belt bends downwards and the movable wheel rolls. It becomes easy to take off.

The present invention has been made paying attention to such an actual situation, without imposing a force on the crawler belt, and
The height of the machine and the tilt of the machine to the left and right can be adjusted satisfactorily in a state in which derailing does not occur easily. Moreover, the introduced movable roller can be made to function well, and it can be run on uneven terrain or in the field, over ridges, or transported. An object of the present invention is to provide a crawler traveling device capable of smoothly loading and unloading a vehicle.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention is characterized in that the drive wheels of the crawler traveling device are provided on the frame of the machine frame, and the supporting frame having the idle wheel group is movable up and down relative to the machine frame. A crawler traveling of a working vehicle in which a crawler belt is wound around the driving wheel and the rocking group while being provided with a drive mechanism that is connected to the machine body frame through a mechanism and rocks the rocking link mechanism. In the device, the idler wheel provided on the support frame on the side opposite to the side where the drive wheels are installed is configured to adjust the tension of the crawler belt by adjusting and fixing the forward and backward positions, and is kept in a fixed state when the support frame is moved up and down. In addition, the swing link mechanism is configured such that the support frame moves toward the drive wheel existing side in the front-rear direction as the support frame lowers relative to the machine body frame, and A movable wheel that can move up and down is provided in the front-rear intermediate portion of the support frame.

[Action]

According to the above configuration, for example, as indicated by a virtual line in FIG. 2, the swing link mechanism (11) is swung down to lower the support frame (6) relative to the machine body frame (2). Then, the distance between the frontmost idle wheel (7) provided on the support frame (6) and the drive wheel (5) becomes large, whereas the entire support frame (6) moves in the front-back direction ( 5)
By moving to the existence side, the distance between the drive wheel (5) and the tension freewheel (8) becomes smaller, and the increase of the crawler belt winding path length [the frontmost freewheel (7) Drive wheel (5)
Between the driving wheel (5) and the idle wheel for tensioning (8)], and the supporting frame (6) relative to the machine frame (2). The crawler belt winding path length when lowered is substantially the same as that before the descent. As a result, even if the support frame (6) moves up and down relatively to the machine body frame (2), the tension of the crawler belt (9) remains almost constant.

Further, when the crawler traveling device (1) moves forward through the raised portion on the ground, first, the front part of the crawler traveling device (1) rides on the raised portion and the vehicle body moves forward and the crawler traveling device ( When the front-rear intermediate portion of 1) is covered with the raised portion, the crawler belt (9) portion near the movable wheel (15) acts to bend upward, and the aircraft relatively descends. The forward ascent is relaxed, the aircraft further moves forward, and the center of gravity of the machine crosses the ridge, and the aircraft returns to the front due to its own weight. After that, when the rear part of the crawler traveling device (1) gets over the ridge, the airframe temporarily moves backward.

Therefore, according to the present invention, the tension of the crawler belt is stable even when the support frame is moved up and down with respect to the machine frame,
There are few problems such as premature deterioration of the crawler belt due to excessive tension, or increase in running load, and conversely, the crawler belt tension is weak and there is no problem of easy derailing. Adjustments and tilt adjustments can now be performed.

In addition, it is possible to introduce movable wheels to run on uneven terrain, to cross ridges, and to load and unload the vehicle onto the bed of a transport vehicle smoothly and safely, while maintaining stable crawler belt tension as described above. Therefore, there is little risk that abnormal tension will be generated when the movable roller moves up and the crawler belt will bend, and the movable roller will not be released. It is now possible to exert good performance and bring high running performance.

As a result, it became possible to improve the work performance and running performance by making good use of the function of the movable wheel as well as the height adjustment and left / right tilt adjustment functions.

〔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 drive wheel (5) attached to a machine body frame (2) constituting the machine body via a transmission case (10), and a swing link described later on the machine body frame (2). A plurality of idle wheels (7) for the crawler grounding portion attached to the support frame (6) connected through the mechanism (11) and an idle wheel (8) for tensioning the crawler are made of rubber. It is made by winding the crawler belt (9), and the transmission case (10)
The drive wheels (5) are driven by the power from 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).
Along with this swing, as the entire support frame (6) moves downward relative to the machine body frame (2), it moves up and down with respect to the machine body frame (2) while moving toward the drive wheel (5) existing side in the front-rear direction. Is done.

Since the support frame (6) moves toward the drive wheel (5) existing side as the support frame (6) lowers relative to the body frame (2), the support frame (6) lowers relative to the front end of the support frame (6). While the distance between the idle wheel and the drive wheel becomes large, the entire support frame (6) moves in the front-rear direction to the drive wheel (5) present side, so that the idle wheel for tensioning the drive wheel (5) is loosened. The distance from the rolling wheels (8) is reduced, and the increase and decrease in the crawler belt winding path length are offset, and the crawler belt winding when the support frame is lowered relative to the machine frame. The hanging path length is almost the same as that before the descent. Therefore, irrespective of the traveling of the support frame (6), the degree of tension change in the crawler belt (9) wound around the drive wheel (5) and the front idler wheels (7), ... (8) does not change so much. It does not happen.

Incidentally, (17) in FIGS. 1 and 2 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 wheels (8) for tensioning the crawler with respect to the support frame (6), the crawler belt (9) is tensioned. Is adjusted. Further, (19) in FIG. 2 is a rubber which also serves as a cushioning material for restricting the most raised position of the support frame (6). The sub swing link (20) is the first swing link (11a), (1
It prevents twisting due to the assembly error in 1b).

Further, a movable wheel (15) which is vertically movable is provided at a front and rear intermediate portion of the support frame (6) via a support arm (16) which is vertically swingably attached to the support frame (6). By swinging the support arm (16) downward, the movable wheel (15) is pressed against the inner peripheral surface of the crawler belt (9) with an appropriate force. The movable wheel (15) has a function of engaging with a core bar protrusion (not shown) of the crawler belt (9) during normal traveling to prevent the crawler belt (9) from coming off laterally, and also the crawler. When the traveling device (1) passes over a ground ridge such as a ridge or a ridge, the front and rear intermediate portions of the ground contact portion of the crawler belt (9) are allowed to bend upward, and the aircraft is tilted too much forward and backward. It has the function of smoothly passing through.

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 an earthmoving 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, (5) …… Drive wheels,
(6) ... Support frame, (7), (8) ... Idler wheel for crawler winding guide, (11) ... Swing link mechanism, (1
4) …… Drive mechanism, (15) …… Movable rolling wheels.

Claims (1)

[Claims] 1. A drive wheel (5) of a crawler traveling device (1) is provided on the machine frame (2) side, and a support frame (6) having a group of idler wheels (7) and (8) is provided on the machine frame (2). A drive mechanism (14) is provided which is connected to the machine body frame (2) via a swing link mechanism (11) so as to be capable of moving up and down relative to 2) and which swings the swing link mechanism (11). A crawler traveling device for a working vehicle, in which a crawler belt (9) is wound around the drive wheel (5) and the idler wheels (7), (8) group, wherein the drive wheel (5) is installed. On the opposite side, the idler wheel (8) provided on 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 is fixed when the support frame (6) is moved up and down. And the support frame (6) is The swing link mechanism (1) is moved so as to move to the drive wheel (5) existing side in the front-rear direction as it descends relative to (2).
A crawler traveling device for a work vehicle, comprising the movable roller wheel (15) which is configured as 1) and is movable up and down in the front-rear intermediate portion of the support frame (6).