JPH02237823A - Gear shifting structure of working vehicle - Google Patents

Abstract

PURPOSE:To make a link mechanism in simple structure and facilitate assemble by protruding an operational shaft upward from a transmission for running in a place near the base of a steering wheel post. CONSTITUTION:To the lower part of a rotary shaft 23, No.1 drive arm 29 rotating in a single piece therewith is fixed, and to the lower part of a cylindrical shaft 25 a No.2 drive arm 30 rotating ion a single piece is secured. No.1 operational shaft 31 for gear shifting and No.2 operational shaft 32 of a transmission for running 8 are installed upright in a place near the lower part of the rotary shaft 23 and near the base of a steering wheel post 22 in such a condition as protruding upward from the transmission for running 8. Thus an operational linkage structure can be accomplished in simple construction without using a ball joint or any complicated link mechanism. Thereby the moving direction of a shift level 19 becomes identical to the machine advancing direction, and the lever 19 can be located no apart much from a steering wheel 18.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a gear shift control lever that is disposed near the sideways side of the steering wheel, and is interlocked and connected to the operating shaft of the driving transmission via a link mechanism. This invention relates to a speed change operation structure for a certain work vehicle.

[Conventional technology]

The conventional operation structure described above is, for example, disclosed in Japanese Patent Application Laid-Open No. 63
As disclosed in Japanese Patent Publication No. 275435, there was one in which the operation shaft of the traveling transmission was disposed at the lower rear of the aircraft body, and the speed change lever and the transmission were mechanically linked.

[Problem that the invention attempts to solve]

However, the conventional structure described above has a vertical interlocking mechanism part that extends from the operating lever located near the side of the steering handle to a location below the driver step directly below the lever, and a longitudinal interlocking mechanism part that extends from the lower part of the operating step to the transmission operating shaft. However, the interlocking distance becomes long and a mechanical operation linkage mechanism with a curved path must be provided, which has the disadvantage that the structure becomes complicated from the viewpoint of the linkage mechanism.

An object of the present invention is to eliminate the above-mentioned disadvantages through a rational arrangement structure.

(Means for Solving the Problems) A feature of the present invention is that in the shift operation structure for a work vehicle described at the beginning, the operation shaft projects upward from the traveling transmission at a position near the base of the steering handle post. There is a certain point, and its action/effect is as follows.

(Function) In other words, the gear shift operating lever is located horizontally above the steering handle post, and the operating shaft is located near the base of the steering handle post, so the operating shaft is located approximately directly below the gear shifting operating lever. It turns out. Therefore,
The linkage is along the steering handle post;
Even if the link mechanism is made relatively simple in terms of both the distance and route for linkage, the speed change operation lever and the speed change operation shaft can be connected so as to interlock as desired while preventing the link mechanism from becoming an obstacle to the driver's feet.

[Effects of the Invention] As a result, the above-mentioned rational arrangement structure of the gear shift operation shaft can be used. Therefore, the link mechanism has a simple structure, and the entire operating structure can be obtained at low cost and in a state where it is easy to damage the assembly.

〔Example〕

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

FIG. 5 shows a heavy duty rice transplanter which is an example of a working vehicle according to the present invention. This rice transplanter is a passenger type traveling machine (1)
A seedling planting device (3) is connected to the rear portion of the device via a link mechanism (2) so as to be movable up and down. A spare seedling stand (4) for storing spare seedlings is provided above the rear part of the traveling body (1).

The traveling aircraft (1) includes a driving unit (6) in the bonnet (5) at the front, and a control unit (7) at the upper rear thereof.
), and a traveling transmission (8) is provided below the control section (7).
are arranged. As shown in No. 4, the driving portion (
In step 6), the engine (9) is disposed below the driving section (6) with its cylinder head section (9a) facing sideways, and an engine cooling radiator (10) is disposed above the engine (9). ) and a cooling fan (11) are arranged, and an engine muffler (12) and an air cleaner (13) are arranged on both left and right sides of the engine (9).

The cylinder head portion (9a), engine mast (12), air cleaner (13), etc. are formed on both left and right sides of the bonnet l-(5), and the elevating step portions (14), (14) are formed on both sides of the bonnet l-(5). Provided in a downward position 4
, make the width of the bonnet l-(5) as small as possible,
Consideration has been given to widening the field of view from the control section (7).

Power from the engine (9) is supplied to the traveling transmission (8) via the transmission belt (15) (-, transmission W
The output shifted in (8) is transmitted to the left and right front wheels (
16). (16) and rear wheel (17). (17)
The transmission is configured to drive the aircraft, and the transmission is controlled by the transmission lever (19) located near the horizontal position of the steering handle (18).
8) is configured to perform the gear change switching operation. Next, the gear shift operation structure will be explained. 31), (32
) are interlocked and connected. Specifically, as shown in FIGS. 1 and 3, the lower end of a rotation shaft (23) disposed along the vertical direction on the left side of the handle post (22) is connected to the transmission (8). It is rotatably mounted and supported on the upper surface of the handle post (22), and the -F part of the rotation shaft (23) is mounted on the handle post (22).
It is supported by a bracket (24) extending from the
A sleeve sleeve (25) is fitted around the rotation shaft (23) so as to be relatively rotatable.

The speed change operation j
/ Bar (19) can be freely swung back and forth around the longitudinal axis (X) via the fulcrum boss member (26), and can be swung back and forth around the vertical axis (Y) of the rotating shaft (23). Along with installing,
The rotation shaft (23) and sleeve sleeve (25) are provided with a lever engaging portion (27a) that can be selectively engaged with the vertical swing of the gear shift operation 1 knob (19). (27b) are connected to each other so as to be integrally rotatable. In other words, the gear shift operation lever (19)
by swinging the lever downwards to -F to connect the lever engaging portion (27a) and (27
engaging recesses (28a) and (28b) formed separately in b).
), the pivot shaft (23) or sleeve sleeve (25) can be rotated by operating the pivot shaft (23) or sleeve sleeve (25) back and forth.

A first drive arm (29), which rotates the body, is fixed to the lower part of the rotation shaft (23), and a second drive arm (3), which rotates, is fixed to the lower part of the sleeve (25).
0) is fixed. The first operating shaft (3I) and the second operating shaft (32) for shifting of the traveling transmission (8) are located near the lower part of the rotating shaft (23) and at the handle boss F (22). ) is erected in a state protruding from the traveling transmission (8) in the 1=direction.

The rotation operation arm (33) of the first stirring shaft (31) and the first drive arm (29) are interlocked and connected by the bin (34), and the second drive arm (30)
are pivotally connected via a push/pull rod (36) so that they can rotate in conjunction with each other.

The traveling transmission (8) has the first tunneling shaft (31).
By rotating, you can move between the forward high speed position (Fr) and the neutral position! (N) and the forward low speed position (I) by one operation around the second operating shaft (32).
, a reverse position (R), and a neutral position (N). The speed change operation lever (19) is operated by a helical spring (37). Therefore, it is biased toward the side that engages with the sleeve (25) side lever engaging portion (27a), that is, toward the f direction, and when it is rocked back and forth in this state, the second photographing axis (32) can be rotated to the neutral position (N
), the first operation shaft (31) can be rotated by swinging it upward and swinging it back and forth with the 17-bar engaging portion (27b) on the rotation shaft (23) side fully engaged. . Here, the direction in which the speed change operation l/bar (19) is simulated is a structure in which it is operated along the horizontal direction, as shown in FIG.
It is configured so that it can be set to the reverse position (R) by operating it from the neutral position (N) towards the rear power, and it can be set to the forward high speed position z (p2) by operating it towards the upper front. The gear shift operating lever (19) and the gear shift operating lever (19) are arranged in such a way that the operating direction of the 1 knob (19) matches the direction of movement of the aircraft, so that the gear shifting operating lever (19) is not far away from the steering handle (18). The handle (18) is designed to be

In this way, the operating shaft (31) of the driving transmission (8)
, (32) is placed near the base of the handle boss I- (22) and protrudes upward six times, so that
The imitation linkage structure can be constructed with a simple structure without using a pole join I or a complicated link mechanism.

[Another example]

The operating shafts (31), (32) may be of a J-2 lower sliding type instead of the rotating operating type, and the operating shafts (31), (32) may be of a single type. It may be composed of one thing.

The present invention is applicable not only to the rice transplanter G but also to various working vehicles such as agricultural tractors and lawn mowers.

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 drawings]

The drawings show an embodiment of the speed change operation structure for a work vehicle according to the present invention, in which FIG. 1 is a vertical cross-sectional rear view of the main parts, FIG. 2 is a view taken along the line 1 and 2 in FIG. 4 is a front view of the driving section, and FIG. 5 is an overall side view of the rice transplanter. (8)...Transmission device, (1B)...Steering handle, (19)...Transmission operation lever, (20)...Link mechanism, ( 22)...
...Steering handle post, (31),
(32)......Operation axis.

Claims (1)

[Claims] Move the gear shift control lever (19) to the steering wheel (18).
), and the driving transmission (
Link mechanism (20) to the operating shafts (31) and (32) of 8)
A shift operation structure for a work vehicle in which the operating shafts (31) and (32) are connected upward from the traveling transmission (8) at a position near the base of the steering handle post (22). The gear change operation structure of a work vehicle is protruded from the top.