JPH0253674A - Steering transmission structure for work truck - Google Patents

Abstract

PURPOSE:To prevent a turning radius from decreasing so small with a side clutch disconnected by providing a low torque transmitting friction transmission device to be interposed over each transmitting gear of right and left running gears in the lower part from the side clutch which disconnects transmission to one of the pair of right and left running gears. CONSTITUTION:In the inside of a transmission case 1 in a work truck of combine or the like, a pair of right and left side gears 4L, 4R are fitted with a play to a supporting shaft 3 of a drive gear 2 transmitting power of an engine, and power transmission is performed of the drive gear 2 and each side gear 4L, 4R through side clutches 8L, 8R. While the supporting shaft 3 provides in its both ends multi-disk side brakes 9L, 9R for right and left crawler running gears 7L, 7R. Further in this case, a low torque transmitting wet type multi-disk clutch 10 is connected to be mounted over both right and left axles 6L, 6R in a lower side of the side clutches 8L, 8R, and power transmission can be performed while slipping from one axle to the other axle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steering transmission structure for a working vehicle that is equipped with a pair of traveling devices such as crawler traveling devices that cannot be steered independently on the left and right sides of the vehicle.

[Conventional technology]

In the combine harvester, which is one of the above-mentioned work vehicles, as disclosed in, for example, Japanese Patent Laid-Open No. 13866, a side clutch is used to cut off power transmission to one of the pair of left and right crawler traveling devices, and Some models are equipped with a handbrake that applies braking to one side of the crawler traveling device. As a result, for example, by disengaging the right hand clutch, a gentle turn to the right can be made, and by engaging the right hand brake, a pivot turn can be made to the right.

[Problem to be solved by the invention]

Work vehicles such as combine harvesters often travel in areas with high running resistance, such as soft fields. In such a place where there is a lot of running resistance, even if the side clutch is disengaged, the running gear on the side clutch disengaged side will stop immediately due to the resistance from the ground, and the aircraft will unexpectedly make a small turn toward the side clutch disengaged side. As a result, there may be a case where the turning radius when the side clutch is disengaged and the turning radius when the handbrake is engaged are not much different.

The present invention has been made with attention to the above-mentioned situation, and it is an object of the present invention to provide a structure in which the turning radius does not become too small even when the side clutch is disengaged even in places where running resistance is large. .

[Means to solve the problem]

A feature of the present invention is that in the steering transmission structure of a working vehicle as described above, a friction transmission device for low torque transmission is interposed between each transmission mechanism of the left and right traveling device on the downstream side from the side clutch. The functions and effects are as follows.

[For production]

With the configuration described above, even if the right side clutch is disengaged on soft ground and the right side traveling gear is about to stop due to resistance from the ground, the power from the left side traveling gear is transferred to the friction transmission device. The signal is transmitted to the right-hand traveling device via the power source, and the right-hand traveling device is forcibly driven. In this case, a slip occurs in the friction transmission, and the power from the left traveling device is transmitted to the right traveling device while being decelerated.

In this way, by configuring the traveling device on the disengaged side of the side clutch to be driven by a certain amount of power even when the side clutch is disengaged, the turning radius when the side clutch is disengaged can be maintained even on ground with high running resistance. It's not particularly small.

〔Effect of the invention〕

As described above, the configuration can be configured so that the turning radius does not become particularly small when the side clutch is disengaged, and even on ground with high running resistance, it is possible to turn in a small radius with a large operation of the handbrake and disengage the side clutch. As a result, the turning performance of the work vehicle can be improved.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, a combine harvester which is one of the embodiments of the present invention will be described based on the drawings.

As shown in Figures 1 and 2, power from the main transmission and sub-transmission (not shown) on the upper side of the transmission case (1) for driving is transmitted to the drive gear (2). come. The support shaft (3) of this drive gear (2)
), a pair of left and right side gears (4R) and (4L) are slidably fitted on the outside, and this side gear (4R)
, (4L) are engaged with the drive gear (2), the transmission gears (5R), (5L), which are always engaged with the side gears (4R), (4L), and the axle (6R), (6
1,) through the left and right crawler traveling devices (7R), (
7L).

As described above, between the left and right side gears (4R), (4L) and the drive gear (2), the left and right crawler traveling devices (7
It consists of side clutches (8R) and (8L) that perform important operations for power transmission to R) and (7L). Multi-plate handbrakes (9R) and (9L) for the left and right crawler traveling devices (7R) and (7L) are provided at both ends of the support shaft (3).

With the above structure, for example, the right side gear (4R) can be separated from the drive gear (2) and the right side clutch (
When the right crawler traveling device (7R) is turned off, the right crawler traveling device (7R) is turned off.
Power to R) was cut off and the aircraft made a slow turn to the right. Then, from the above state, further slide the side gear (4R) to apply the right side brake (9R).
When the side gear (4R) is pressed in, the right crawler traveling device (7R) is braked and the aircraft turns to the right.

A wet multi-disc clutch as a friction transmission device (10) for transmitting low torque is installed across both the left and right axles (6R) and (6L), which are the lower side of the side clutches (8R) and (8L). connected. This multi-plate clutch (1
The allowable transmission torque of 0) is set low, and when the side clutches (8R) and (8L) are disengaged, the transmission from one axle (6R) or (6L) to the other axle (6L) or ( 6R).

Further, as the friction transmission device (10), not only a multi-plate clutch but also a viscous clutch, a tapered cone type clutch, etc. can be used. Furthermore, the friction transmission device (1
0) may be configured to be switchable between a transmission state and a transmission off state.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the steering transmission structure for a working vehicle according to the present invention, and FIG. 1 is a longitudinal sectional front view of the vicinity of the side clutch, handbrake, and multi-disc clutch in the transmission case;
FIG. 2 is a side view of the first half of the combine. (7R), (7L)... Traveling device, (8R)
, (8L)...Side clutch, (9R),
(9L)...Handbrake, (10)...
...Friction transmission device.

Claims (1)

[Claims] Side clutches (8R) and (8L) cut off power transmission to one of the pair of left and right running gears (7R) and (7L), and side clutches (8R) and (8L) cut off power transmission to one of the running gears ( This is a steering transmission structure for a work vehicle equipped with side brakes (9R) and (9L) that apply braking to the side clutches (8R) and (8L), wherein the left and right running side brakes are provided on the lower side of the side clutches (8R) and (8L). Device (7R), (7L)
A friction transmission device for low torque transmission between each transmission mechanism (
10) A steering transmission structure for a working vehicle that is interposed.