JPH0373492B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is used by being installed in, for example, a rice transplanter, etc., and more specifically, the present invention is used in a rice transplanter, etc., and more specifically, it is used in a traveling operation equipped with a differential mechanism capable of deflocking and a brake mechanism for a traveling axle. Regarding structure.

[Conventional technology]

In this type of travel operation structure, conventionally, the member that acts on the travel brake and the shift member that creates the deflock state are constructed as separate members (for example, as disclosed in Japanese Utility Model Application Publication No. 52-91921, Akira
57-10970).

[Problem that the invention seeks to solve]

Therefore, operating members are required for each of the travel brake and the differential lock mechanism, resulting in an increase in the number of parts.

An object of the present invention is to provide a rational arrangement of the shift member for the differential lock, so that not only the operating member acting on the differential mechanism and the operating member acting on the handbrake, but also the differential operating tool and the handbrake operating tool can be controlled. The object of the present invention is to provide a handbrake operating tool that can provide a better operating feeling while also simplifying the linkage mechanism.

[Means for solving problems]

The characteristic configuration of the present invention is to provide side brakes connected to left and right hand brake operating tools near both ends of an axle having a differential mechanism, and
A shift member is provided on the axle and is located between one of the handbrakes and the differential mechanism and is capable of sliding forward and backward along the axis of the axle, and the shift member is moved toward the side brake to indicate the braking state. For a differential lock, one of the handbrake operation tools to be released and the shift member are interlocked and connected via a linkage mechanism, and the shift member is moved in a direction opposite to the brake operation direction to lock the differential mechanism. An operating tool is linked in the middle of the linkage mechanism, and further,
One of the handbrake operating tools and the linking mechanism are connected via an elastic flexibility mechanism, and the effects thereof are as follows.

[Function] Focusing on the fact that brake mechanisms are provided on both sides of the differential mechanism, this shift member can be changed by simply providing a shift member that can slide forward and backward between one side brake and the differential mechanism. Sliding in one direction acts on the differential case to create a differential lock state, and sliding in the opposite direction acts on the brake to operate the brake.

Further, since the shift member is configured to act on the differential mechanism and the handbrake, the linking mechanism to the differential lock operating tool can be connected from the middle of the mechanism linking one side brake to the handbrake operating tool. In this way, the linkage mechanism between the shift member and one of the handbrakes can also be used as the linkage mechanism between the shift member and the deflock operating tool.

Furthermore, since the differential lock operating tool is linked to one side brake operating tool linkage mechanism,
Even when the differential operating tool is operated, the elastic flexibility mechanism provided at the connecting portion between the one handbrake operating tool and the linkage mechanism is elastically deformed, thereby causing the differential locking to be performed on the one handbrake operating tool. The operating force applied to the operating tool can be absorbed and alleviated.
In addition, this elastic flexibility mechanism is also configured as a return mechanism that returns the defrock operating tool to its original position by applying a biasing force when the operating force applied to the defrock operating tool is released.

〔Effect of the invention〕

In terms of operation, the structure can be simplified by combining the operating member for one side brake and the shift member for the differential lock, and in particular, a structure in which the differential mechanism and the hand brake mechanism are disposed close to each other. , the shift member acting on both is one
This makes it easy to arrange the shift member itself.

In terms of operation, since the linking mechanism to the differential lock operating tool is connected from the middle of the mechanism linking one of the handbrakes and the handbrake operating tool, the linking mechanism from the linking part to the shift member is also used. Therefore, the dual-purpose effect of using a single shift member can be made even more effective, and the operation structure can be further simplified.

In terms of operation, in order to connect the linking mechanism to the differential handbrake operating tool to the linking mechanism of the one handbrake operating tool, one of the handbrake operating tools has a structure that does not transmit the operating force to the defrock operating tool to the handbrake operating tool. There is also a method of providing flexibility in the form of an elongated hole at the connecting part between the handbrake operating tool and the linkage mechanism, but in this case, the play of the elongated hole is available when operating one of the handbrake operating tools, which improves the operating feel. However, in the case of the present invention, by selecting a rational installation position for the elastic accommodating mechanism, the elastic accommodating mechanism can be improved. It is possible to perform the function of the return mechanism, and also to provide a reaction force corresponding to the amount of operation to the driver when operating with one handbrake operating tool, so the operation feeling for the driver is less strange. This allows for smoother operation.

〔Example〕

As shown in Figure 6, the engine 1 is located at the front of the aircraft.
At the rear end of the passenger vehicle body A, in which the transmission case 2 is arranged and the driver's seat 3 is provided in the middle, a link mechanism 5 that can be raised and lowered by a hydraulic cylinder 4 is installed.
A seedling planting device B consisting of a seedling stand 6, a planting mechanism 7, and a grounding float 8 is interlocked to form a riding rice transplanter.

The transmission structure of the rear wheels 9, 9 pivotally supported on the passenger vehicle body A will be described in detail. As shown in Figure 3,
A pair of left and right main frames 10, 10 with forward and backward postures.
Near the rear end, a pair of front and rear plate-like frames 11, 11
A rear transmission case 13, which is transmission-connected to the transmission case 2 via a transmission shaft 12, is attached to the plate-shaped frames 11, 11.
The plate frames 11, 11 are connected to the mission case 2 via reinforcing rods 14 to form a rigid structure. Gear cases 15A and 15B are connected to both ends of the rear transmission case 13,
Rear wheels 9, 9 are pivotally supported at the lower ends of the gear cases 15A, 15B, respectively.

Above the transmission shaft 12 is a driving section deck 16.
is stretched and protrudes above the deck 16, and a pair of left and right side brake foot operating tools 17A, 17
B is provided. The hand brake foot operating tools 17A, 17B include left and right operating shafts 18A, 18B protruding from the rear transmission case 13, and left and right swinging arms that can swing integrally with the hand brake foot operating tools 17A, 17B. 19A, 19B are connected to left and right connecting rods 20A, 20, which are an example of a linking mechanism.
They are interlocked and connected at B to enable braking and turning operations. A foot operating tool 21 for a defroster is provided protrudingly on the deck 16 on the side of the driver's seat 3, and the lower end of this operating tool 21 is relatively swingably connected to one end of a bell crank 22 that can swing up and down around the horizontal support axis X. At the same time, the elongated engagement hole 23a of the plate member 23 fixed to the intermediate portion of the right connecting rod 20B is fitted into the protruding pin 22a of the bell crank 22, thereby forming the differential linkage mechanism 24. It has been done.
Then, the urging force acting on the left connecting rod 20B of the elastic accommodation mechanism 25, which will be described later, is applied to the protruding pin 22.
The engagement hole 23a is also used as a return force acting on the differential lock pedal 21.

The right swing arm 19B and the right connecting rod 20B
Two springs with different spring constants as an example of the elastic flexibility mechanism 25 are arranged concentrically at the connection site with the right side brake foot operation device 17 by pressing the defroc foot operation device 21.
Despite the operation of the right connecting rod 20B, which is operated in the opposite direction to the operating direction by B, the right side brake foot operating tool 17B, which is in a standby state, is not operated due to the elastic deformation of the spring itself. There is. Also, the engagement hole 23a of the plate material 23
The right connecting rod 20B is also formed into an elongated hole that is long in the operating direction, and the differential lock remains in a standby state even when the handbrake foot operating device 17B is operated to operate the brake beyond the elastic deformation of the spring 25. The foot operation tool 21 is designed not to operate.

As shown in FIG. 2, since the elastic accommodation mechanism 25 is composed of two springs with different spring constants, the two spring forces work effectively toward the latter half of the amount of pedal operation, and the structure does not increase the amount of operation. It's getting old.

The rear transmission case 13 and the left and right gear cases 15
The structure of A and 15B will be explained in detail. As shown in FIGS. 1 and 2, a bevel gear 32 is fitted to the inner end of the rear transmission case 13 of the transmission shaft 12, and a differential case 33 constituting the differential mechanism 40
It is configured to be able to engage with a bevel gear 34 fitted externally. The differential case 33 includes differential side gears 35, 35 and differential pinion gears 36, 36 internally, and a left and right transverse transmission shaft 37A constituting an axle on which the differential side gears 35, 35 are externally fitted with splines.
It is configured to be transmission connected to the left and right gear cases 15A and 15B via 37B. A right shift member 38B that is slidable in the direction of the axis Y is fitted onto the outer end of the right lateral transmission shaft 37B by a spline, and this right shift member 38B has a claw portion 38a that can engage and disengage from the differential case 33; An engagement portion 38b with the shift fork 26 operated by the right operation shaft 18B linked to the right side brake and defroc foot operation devices 17B and 21, and an engagement portion 38b with the right friction multi-plate brake 27B, which will be described later. Contact sleeve part 38c
It is made up of. With the above configuration, when the right side brake foot operating tool 17B is depressed, the right connecting rod 20B is pulled in the direction of the operating tool 17B from the point where the elastic displacement of the elastic accommodation mechanism 25 is exceeded, and the operating shaft 18B is moved. As it rotates, the right shift member 38A comes to act on the right side brake 27B. Further, when the differential foot operating tool 21 is depressed, the right connecting rod 20B is pushed in the opposite direction to the operating tool 17B, and the shift member 38 is pushed.
A operates in the direction in which it engages with the differential case 33.

On the opposite side to the side where the right shift member 38B is located, a left shift member 38A that can be slid in the axial direction is fitted onto the left horizontal transmission shaft 37A by a spline, and a left side brake is attached to the left shift member 38A. A sleeve portion 38d that acts on the left side brake pedal 27A and a portion 38e that engages with a shift fork linked to the left side brake foot operating tool 17A are provided.

The left and right friction multi-plate side brakes 27A, 27B are provided on the sideways transmission shaft sides of the left and right connecting shafts 28A, 28B which are disposed abutting against the left and right horizontal transmission shafts 37A, 37B. A spline portion for integral connection with the left and right shift members 38A, 38B is formed on the inner end side of the left and right shift members 27A, 27B. Also, left and right connecting shaft 2
Gear cases 15A, 1 are on the other end side of 8A, 28B.
Gears 29, 29 located within 5B are provided, and 2
Traveling power from the engine 1 is transmitted to the traveling axle 31 via the stepped reduction mechanism 30.

[Another example]

B. The defrock operating tool 21 and the handbrake operating tool do not have to be foot-operated.

○B The above embodiment may be applied not only to rice transplanters but also to other agricultural vehicles and general vehicles.

○C Running wheels may be provided on the horizontal transmission shafts 37, 37.

(D) The elastic accommodation mechanism 25 may be a single spring.

[Brief explanation of drawings]

The drawings show an embodiment of the traveling operation structure according to the present invention, FIG. 1 is a side view showing the elastic flexibility mechanism, FIG. 2 is a graph showing the operating force of the elastic flexibility mechanism, FIG. 3 is an overall side view, and FIG. Figure 4 is a vertical cross-sectional view showing the differential mechanism.
FIG. 5 is a sectional view showing the operation structure for the shift member, and FIG. 6 is a side view of the rice transplanter. 17A, 17B... Left and right side brake operating tool, 20B... Interlocking mechanism, 21... Deflock operating tool, 25... Elastic accommodation mechanism, 27A, 27B
... Left and right side brakes, 37A, 37B... Left and right axles, 38B... Shift member, 40... Differential mechanism.

Claims (1)

[Claims] 1. Left and right handbrake operating tools 17 are installed near both ends of the axles 37A and 37B having the differential mechanism 40, respectively.
A, hand brake 27A linked to 17B,
27B, and a shift member 38B is provided on the axle 37B, which is located between one side brake 27B and the differential mechanism 40 and capable of sliding forward and backward along the axis of the axle 37B.
One handbrake operating tool 1 that moves B to the side of the handbrake 27B to display the braking state
7B and the shift member 38B by a linking mechanism 20B.
A differential lock operating tool 21 is interlocked with the linking mechanism 20B and moves the shift member 38B in a direction opposite to the brake operation direction to lock the differential mechanism 40. Furthermore, one side brake operating tool 17
B and the linkage mechanism 20B are connected to each other by an elastic accommodation mechanism 25.
The driving operation structure is connected through the.