JPH066409B2 - Work vehicle - Google Patents

Description

The present invention relates to the structure of an operating system of a work vehicle equipped with a clutch type forward / reverse switching device.

[Conventional technology]

In an agricultural tractor that is an example of a work vehicle, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 57-114729, a forward / reverse switching lever for operating a clutch-type forward / reverse switching device,
There is a type that is arranged in the vicinity of the control panel or the control handle and is operated by hand to operate the forward / reverse switching lever.

[Problems to be Solved by the Invention] In recent years, in agricultural tractors, front-loading work devices such as a dozer blade and a front loader are often attached to the front part of the machine body.

In such a case, the work is frequently performed by performing the forward / reverse switching operation, but at the same time as the forward / backward switching operation, the handle operation, the raising / lowering operation of the pre-installed work device, the gear shifting operation, etc. must all be performed by hand. However, continuous operation of these is complicated for the operator of the agricultural tractor, and there is room for improvement.

An object of the present invention is to reduce the manual operation of a worker in a work vehicle.

[Means for solving problems]

A feature of the present invention is that the work vehicle as described above is configured as follows.

A forward / reverse switching device composed of a forward clutch and a reverse clutch is provided, and the forward foot pedal and the backward foot pedal are arranged side by side in the lateral direction of the machine body in the control section, and the forward foot pedal is operated. Then, the forward clutch is operated, and the reverse foot pedal is returned and the reverse clutch is disengaged.
When the reverse foot pedal is stepped on, the reverse clutch is turned on, and the forward foot pedal is returned and the forward clutch is disengaged so that the forward and reverse foot pedals and forward / reverse switching are performed. A detent mechanism is provided, which is provided with a linkage mechanism for linking with the device and is capable of locking and holding the forward and backward foot pedals separately at the stepped position.

[Action]

(I) With the configuration according to the present invention, the forward / reverse switching operation, which has been performed by hand until now, can be performed with the foot, so that one required operation performed by hand is omitted.

(Ii) Also, by arranging the forward foot pedal and the reverse foot pedal in parallel, by swinging the toes left and right with the foot cut, the forward foot pedal and the reverse foot pedal are It becomes easier to step through.

(Iii) When the forward and backward foot pedals are depressed by the action of the linkage mechanism and the detent mechanism, this depressed state is maintained, and at the same time, the other depressed pedal is returned. To be done.

As a result, for example, when the forward foot pedal is depressed, the forward clutch is engaged and operated, and this state is maintained.
Since the backward-moving foot pedal, which has already been stepped on, returns to the original state and the backward-moving clutch is disengaged, the foot can be separated from the forward-moving foot pedal to move the vehicle forward.

〔The invention's effect〕

As described above, since the forward / reverse switching operation is configured to be performed by the foot and one required operation to be performed by hand is omitted, the burden on the hand is reduced and the operation performed by hand can be performed with a margin. As a result, the maneuverability of the worker can be improved.

Further, the forward / reverse switching operation performed by the foot can be easily performed by simply swinging the toe to the right and left, and the foot can be released once depressing, so that the forward / backward switching operation performed by the foot also has good operability.

〔Example〕

Hereinafter, an agricultural tractor which is one of the embodiments of the present invention will be described with reference to the drawings.

Fig. 1 shows the power transmission system of the agricultural tractor, in which the power from the engine (1) is the main clutch (2) and the first cylindrical shaft.
From (3) is transmitted to the forward / reverse switching device (4).

This forward / reverse switching device (4) is a multi-plate hydraulic type forward clutch.
(5) and a reverse clutch (6). When the forward clutch (5) is turned on and operated, the first cylindrical shaft (3) and the second cylindrical shaft on the output side (7) are directly connected to each other, and the engine The power of (1) is transmitted to the main transmission (8) for four-speed shifting in the forward rotation state, which is the forward traveling state. On the contrary, when the reverse clutch (6) is turned on and operated, the power of the engine (1) becomes the first transmission gear (9),
It is transmitted to the second cylindrical shaft (7) in the reverse rotation state via the first electric motor (10), which is the reverse drive state.

Next, the configuration of the operation system of the forward / reverse switching device (4) will be described. As shown in FIGS. 1 and 2, the main clutch (2) is provided on the left side of the floor (12) in the steering section (11) of the agricultural tractor.
There is a clutch pedal (13) for the on / off operation of the, and the forward foot pedal (14) and the reverse foot pedal (1
5) and are arranged side by side in the left-right direction of the aircraft. The forward and reverse foot pedals (14), (15) and the control valve (16) for the forward-reverse switching device (4) are mechanically interlocked via a seesaw-type linkage mechanism (17). Has been done.

As a result, when the forward foot pedal (14) is depressed, the control valve (16) is switched and the forward clutch (5) is turned on and the reverse foot pedal (15) is returned to the reverse position. The clutch (6) is disengaged. On the contrary, when the backward movement foot pedal (15) is depressed, the control valve (16) is reversely switched and the backward movement clutch (6) is operated.
The forward foot pedal (14) is returned and the forward clutch (5) is disengaged.

The forward and reverse foot pedals (14) and (15) are
A detent mechanism (not shown), which is installed once the pedal is depressed, maintains the depressed state and allows the foot to be separated from the forward and backward foot pedals (14) and (15). As a result, when the forward foot pedal (14) is depressed, the reverse foot pedal (15)
Returns to its original state, and the aircraft can be moved forward by releasing the foot from the forward foot pedal (14). On the contrary, when the reverse foot pedal (15) is depressed, the forward foot pedal (14) that was already depressed returns to its original state, and the aircraft should be moved backward by releasing the foot from the reverse foot pedal (15). You can

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 THE DRAWINGS The drawings show an embodiment of a work vehicle according to the present invention, and FIG. 1 is a view showing a linkage structure of a transmission system of an agricultural tractor, a forward / reverse switching device, and forward and backward foot pedals. FIG. 2 is a plan view of the vicinity of the control section of the agricultural tractor. (4) …… forward / reverse switching device, (5) …… forward clutch, (6)
…… Reverse clutch, (11) …… Control section, (14) …… Forward foot pedal, (15) …… Reverse foot pedal, (17) ……
Coordination mechanism.

Claims (1)

[Claims] 1. A forward clutch (5) and a reverse clutch (6)
And a forward / reverse switching device (4), which includes a forward foot pedal (14) and a reverse foot pedal (15).
When the forward movement foot pedal (14) is stepped on while being arranged in parallel in the machine left-right direction in (11), the forward movement clutch (5) is turned on and the reverse movement foot pedal (15) is returned. Operated by the reverse clutch
Conversely, when the reverse foot pedal (15) is stepped on so that (6) is turned off, the reverse clutch (6)
So that the forward movement foot pedal (14) is returned and the forward movement clutch (5) is disengaged.
5) A detent capable of retaining and holding the forward and reverse foot pedals (14) and (15) separately at the stepping position, provided with a linking mechanism (17) for linking the forward / reverse switching device (4). A work vehicle equipped with a mechanism.