JPS6212666Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention selectively engages a plurality of speed change operation shafts by pushing and pulling, and at the same time, an operation lever for performing a speed change operation on the selected speed change operation shaft is attached to a receiving member. This invention relates to a speed change operation structure for a work vehicle that is supported on a vehicle body frame via.

In the above devices, in order to display the shift operation position of the lever, the grip side of the lever is generally bent in an upward direction perpendicular or almost perpendicular to the push/pull operation direction, and the bent part is attached to the vehicle body frame. It was protruding from the attached lever guide. However, the lever must have a length above the lever guide that is sufficient to allow operation without being obstructed by the lever guide.
The disadvantage is that the installation space for the lever becomes larger.
Furthermore, in devices such as the walking type in which the operation part for the lever must be provided apart from the mission case, there is a drawback that a large lever guide is required.

In addition, in the above-mentioned method, for example, when cultivating the base of trees in an orchard, the operation of the speed change operation shaft that changes speed between low speed forward and reverse is often used, so the operation lever is not connected to the speed change operation shaft. Depending on the model, the lever is biased to engage the gear shift shaft that is used more frequently, making gear shifting operations easier and preventing unexpected high speed shifts. However, in the past, a spring receiver was generally attached to the lever and a spring was interposed between the spring receiver and the vehicle body side member, resulting in a complicated structure.

In view of the above points, the present invention makes it possible to display the gear shift operation position of the lever with a simple structure, and effectively utilizes the structure for that purpose. The purpose is to enable the operation lever to be engaged with the operation shaft.

In order to achieve the above object, the present invention provides a shift operation structure for a working vehicle as described above, in which a display member is fitted into one of the operating lever and the receiving member, and a guide groove in which the display member is fitted into the other. guides each having a shape formed therein are arranged in series, and the operating lever is positioned between the display member or the guide connected to the operating lever and the receiving member at a position where the operating lever is engaged with a specific one of the shift operating shafts. It is characterized by being equipped with a bullet that allows it to return to its original state.

In other words, by effectively utilizing the receiving member for supporting the lever on the vehicle body frame and the lever itself, a guide is connected to one side of the receiving member and the lever, and an indicating member is provided on the other side to protrude from the guide groove of the guide. This eliminates the need for the lever to have a large bent part in order to make the lever itself protrude from the guide groove, and also eliminates the need to extend the guide close to the operating part of the lever, making it easier to operate the lever. It is now possible to display the position using a simple structure.

Moreover, the display member or the guide and the receiving member are effectively used as spring supports, and a spring is interposed between them, making a dedicated spring support unnecessary.
It is possible to provide a structure that can bias the lever to return to the side where it engages with a specific speed change operation shaft and that can engage the operation lever with a frequently used speed change operation shaft with a simple configuration and at low cost.

Hereinafter, embodiments of the present invention will be described in detail with reference to illustrative drawings.

A rotary tilling device 5 is interlocked with the front part of the traveling machine body, which is constructed by providing a transmission case 2 with a pair of left and right wheels 1 and an engine 3, and extending a control handle 4 to the rear of the machine body, to perform walking. It is configured as a type tiller.

A pair of front and rear shift operation shafts 6 and 7 for the gear type transmission mechanism inside the case 2 are protruded from the lateral outer side of the transmission case 2, and a shift operation lever 8 is provided at the shaft end of each of the operation shafts 6 and 7. Engagement recesses 10 and 11 for engaging and disengaging the transmission arm 9 connected to the gearbox are provided with their opening sides facing each other.

A gear shift operating lever 8 is supported so as to be slidable and rotatable in the longitudinal direction of the aircraft via a receiving member 13 attached to the aircraft body frame 12, and both gear shift operating shafts 6 are supported by pushing and pulling the lever 8. .

A guide 15 in which an H-shaped guide groove 14 is formed is connected to the receiving member 13, and the operating lever 8
, a display member 1 protrudes through the guide groove 14;
6 attached to the outer surface of the guide 15, and the reverse position R, and the forward first to third speed positions F ₁ , F ₂ ,
Based on the relative position between the display of F ₃ and the display member 16,
It is constructed so that a gear shift operation to a desired position can be easily performed.

A compression spring 17 as an example of a bullet is interposed between the display member 16 and the receiving member 13 with both 16 and 13 serving as spring receivers, and the operating lever 8 is connected to the shift operating shafts 6 and 7. Of these, it is configured to be returned to the position where it engages with the gear 6 that changes gears between reverse and low-speed forward, thereby preventing unexpected high-speed travel and, for example, when plowing at the base of a tree in an orchard. It is constructed so that frequent switching between frequently used reverse and low-speed forward movements can be performed smoothly and satisfactorily.

In the present invention, the guide 15 is connected to the lever 8.
On the other hand, the display member 16 may be connected to the receiving member 13.

In the above embodiment, the rotary tiller 5 is interlocked with the front part of the machine, and a walk-behind cultivator suitable for tilling near the roots of trees in an orchard has been shown. It can also be applied to various types of work vehicles such as dozer work vehicles and dump-type transport vehicles.For example, when used in dump-type transport vehicles to intermittently discharge earth and sand at predetermined intervals as the vehicle travels, It is preferable to move at high speed to the release position and travel at a slightly low speed at the release position, and the desired speed change is frequently used in the forward state. Any structure may be used as long as the ammunition 17 is interposed so as to be engaged with the shaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the operator's speed change operation structure according to the present invention, in which Fig. 1 is an overall side view of the walk-behind cultivator, Fig. 2 is an enlarged side view with a partial cutaway of the main parts, and Fig. 3 is an essential part. FIG. 6, 7... Speed change operation shaft, 8... Speed change operation lever, 12... Vehicle body frame, 13... Reception member,
14... Guide groove, 15... Guide, 16... Display member, 17... Bullet machine.

Claims (1)

[Scope of utility model registration request] An operating lever 8 that selectively engages a plurality of shift operating shafts 6 and 7 by push/pull operations and performs a speed change operation of the selected shift operating shaft 6 or 7 by rotation is moved through the receiving member 13. This is a speed change operation structure for a working vehicle supported by a vehicle body frame 12, in which a display member 16 is provided on one side of the operating lever 8 and a receiving member 13, and a guide groove 14 into which the display member 16 is fitted is provided on the other side. The formed guides 15 are connected to each other, and a display member 16 connected to the operating lever 8 or between the guide 15 and the receiving member 13,
An ammunition machine 1 for returning the operation lever 8 to a position where it engages a specific one of the speed change operation shafts 6 and 7.
A gear shift operation structure for a work vehicle, characterized by having a gear shift mechanism (7) interposed therein.