JPS6212425A - Steering and running control arrangement in working machine for paddy field - Google Patents

Abstract

PURPOSE:To ensure a satisfactory turning performance of a working machine for paddy field, by providing steering brakes which are independently actuatable, onto a pair of right and left unsteerable wheels such that a differential locking mechanism is released in association with operation of each brake and with steering operation by an amount exceeding a predetermined amount. CONSTITUTION:The output power of an engine 1 transmitted through an output shaft 7 extending from a mission casing 2 may be transmitted to rear wheels 5 through a differential gear mechanism 9. A differential gear lock mechanism 16 is provided on either one of right and left differential side gears in the differential gear mechanism 9, and steering brakes 18A, 18B are provided for the right and left rear wheels 5, respectively. Further, the differential gear lock mechanism 16 is released by means of a linkage mechanism 23 when a pedal 22A is depressed by one stage while the brake 18A is actuated when the pedal 22A is depressed by two stages, and the brake 18B is actuated by means of a linkage mechanism 27 when a pedal 22B is depressed by two stages. Further, the differential gear mechanism 16 is released by means of a linkage mechanism 35 when a steering wheel 32 is turned exceeding a set value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the steering/travel operation structure of a paddy field working machine.

[Conventional technology]

Conventionally, this type of paddy field working machine has been provided with independently operable steering brakes for a pair of left and right non-steering wheels, and also provided with a differential mechanism for the non-steering wheels.

[Problem that the invention seeks to solve]

However, in this case, the differential mechanism is in operation, so
It had poor straightness, and this tendency was especially noticeable when working in rice fields.

Therefore, some models are equipped with a differential lock mechanism for the purpose of improving straight-ahead running, but in this case, when the steering brake is operated with the differential lock mechanism activated and the steering brake is operated to perform a turn, it is necessary to drive on the outside of the turn. The problem remained that the wheels were dragged, making it impossible to perform a good turning operation.

The object of the present invention is to organically link a steering brake that allows for small turns and a differential lock mechanism that improves straight-line performance, so that both straight-line and turning operations can be performed smoothly, and the differential lock mechanism that allows for smooth turning is achieved. The point is to provide something that can prevent damage.

[Means for solving problems]

The characteristic configuration of the present invention is that each of the pair of left and right non-steering wheels is provided with a steering brake that can be operated independently, and a locking mechanism is provided for the differential mechanism for the non-steering wheels, which is linked to the steering brake. actuating the locking mechanism in the releasing direction in conjunction with the braking operation of the steering operating tool that has been applied;
A first linkage mechanism is provided that operates the brake after the lock is released, and a second linkage mechanism is further provided that releases the differential lock mechanism in conjunction with a turning operation of the steering handle that exceeds a set amount. Its effects are as follows.

[For production]

In other words, the differential lock mechanism can be released in conjunction with the operation of the steering brake, so when driving straight, the differential lock mechanism is activated to maintain good straight-line performance, and when turning, the differential lock is released. Good turning performance can be ensured by the operation of the differential mechanism.

〔Effect of the invention〕

As a result, a configuration suitable for the operating state of the work equipment can be automatically displayed, improving driving performance and improving operability. Moreover, one of the operating tools and the differential lock mechanism are interlocked and connected, and the brake is operated after the differential lock mechanism is released according to the amount of operation of the operating tool, so excessive loads are placed on the differential gear etc. This means that the brakes must be operated while maintaining the differential lock state, which could cause destruction or damage, and the brake operation can be performed with the differential lock state reliably released.

Moreover, if the differential lock state is released only by operating the steering brake, the steering brake may shift to turning operation with the differential locked state without operating the steering brake, and the steering brake may be released midway through the turn. When releasing the differential lock state by operating the
) is stronger than when driving straight, so the operation force is greater when releasing (and there is a disadvantage that it produces shock or impact noise), but in the case of the present invention, the setting amount of the handle Since the differential lock mechanism is released by the above-mentioned turning operation, it can be released before the engaged state of the defrot claws becomes strong, so it is possible to suppress the shock and impact noise when releasing. It offers smooth and comfortable turning operations and prevents mechanical damage to the differential lock mechanism itself, allowing stable use over a long period of time.

〔Example〕

As shown in Fig. 5, the aircraft (A) is equipped with an engine (1) and a mission case (2) at the front, and a driving section (3) at the center, with steering wheels (4) and (4) at the front. It is supported by rear non-steering wheels (5) and (5), and is connected to a seedling planting device (B) via a lifting link (6) provided at the rear end of the aircraft (A) for paddy field work. This is a riding-type rice transplanter as an example of the machine.

To explain the traveling drive structure in detail, as shown in Fig. 1, the output shaft (7) extending from the transmission case (2) is interlocked and connected to the transmission case (8) for the rear wheels (5).
The output from the engine (1) transmitted via the output shaft (7) is transmitted to the rear wheels (5) via a differential mechanism (9) within a transmission case (8).

As shown in FIG. 4, the support structure of the rear wheel (5) is explained in detail. Gear cases (19) are attached to both lateral outer sides of the transmission case (8),
9), the axle (21) is pivotally supported. This axle (21) is extended laterally outward in order to widen the tread, and a wheel (5) is fixed to the end of this extension. An axle cover (29) fixed to the gear case (19) is provided for the extending portion up to the wheel mounting portion to prevent grass from wrapping around the extending shaft portion and collisions with flying stones, etc. It is.

Next, the structure of the transmission case (8) will be described in detail.
As shown in the figure and FIG. 3, the bevel gear (10) fitted to the shaft end of the output shaft (7) is engaged with the differential input gear (12) fitted externally to the differential case (11). The cylindrical differential case (11) is configured to transmit engine output, and the differential case (11) axis center (P
) The differential pinion gear (13), (13) is rotatably supported by a pin around the axis (B) perpendicular to the axis (B), and
P) differential side gear (14) that can rotate around (
14) are held in metal contact. The left and right differential side gears (14), (14) are rotatable integrally with the output transmission shaft (15) to the rear wheels (5) whose axes are aligned with the differential case (11) axis (P), respectively. A clutch sleeve (17) for the differential lock mechanism (16) is fitted onto the outside of the output transmission shaft (15) and forms a transmission system to the rear wheels (5), and is disposed on the outside of one of the differential side gears (14). A friction plate type steering brake (18A) is further provided on the outer side.

The clutch sleeve (17) is attached to the cylindrical differential case (
An engaging claw (17) that can be fitted with an engaging claw (lla) also provided on the differential case (11) side on the side opposite to the engaging claw (11).
a) and this occlusal nail (lla), (17a)
Mechanism that creates a differential lock state by interlocking the two (1)
6), and is biased toward the occlusal side (that is, the differential lock side) by a spring (20). On the brake (18A) side of this clutch sleeve (17) is a sleeve (
31), and when the clutch sleeve (17) is operated in the direction of disengaging the differential case (11), the sleeve (
31) is configured to come into contact with the steering brake (18A). The shift fork (24) for the clutch sleeve (17) and one pedal (22A) are linked with a wire (23), so that this pedal (22A)
By depressing the first step, the engagement between the clutch sleeve (17) and the differential case (11) is released and the differential lock state is released (the sleeve (31) is not in contact with the brake (18A)), and the next step is pressed. When the lever is depressed, the sleeve (31) is brought into contact with the brake (18A) and the lever (18A) is actuated.

On the other hand, hold the differential case (11) between the clutch sleeve (
There is a shift fork (25) on the opposite side to the side where 17) is located.
) is slidably operated by a sleeve (26).

(31), and the other steering brake (18B) is activated by depressing the other pedal (22B) in two steps, which is linked to the shift fork (25) by a wire that is one of the first linkage mechanisms (27). The sleeve (31) is brought into contact with the sleeve (31). However, in this case, the sleeve (31) does not act on the steering brake (18B) even if the pedal (22B) is depressed one step.

As shown in FIG. 1, the other pedal (22B) is provided with a linking lock (28) that comes into contact with the one pedal (22A) from above, and this other pedal (22B)
1. The locking device (28) does not operate one of the pedals (22^) even if the pedal is depressed one step. In addition, the locking device (28) is spaced apart from the one pedal (22A) when not in operation so that the subsequent two-step depression operation activates only the one-step depression operation bone of the one pedal (22A)'. It is installed in good condition. This separation distance is set smaller than the one-step depression stroke of one pedal (22A), so that the differential lock state is released before the brake operation by the other pedal (22B).

As shown in FIGS. 1 and 2, the front steering axle (4),
The knuckle arm (30) provided in (4), (
30) and a pitman arm (33) linked to the steering handle (32) are interlocked and connected by tie rods (34) and (34) to form a steering operation structure, and the pitman arm (33) is connected to the pitman arm (33). A rocking motion in conjunction with the control handle (32) of the man arm (33) is transmitted to the clutch sleeve (17) via the second linkage mechanism (35).

The linkage mechanism (35) has an engagement groove (36) that can be integrally operated by swinging the focusman arm (33) at a set angle or more.
The swinging arm (36) having the structure a) and the actuation arm (37) for the shift fork (24) for the clutch sleeve (17) are linked by two wire mechanisms (38), and the control handle (32) The differential lock mechanism (16) is released in conjunction with turning movement exceeding a set amount. Note that the operating arm (37) and the wire mechanism (38
) is provided with an elongated hole (39a) in the connection part (39) with the steering brake pedal (22B) so that the operating force is not transmitted to the second linkage mechanism (35) even when the steering brake pedal (22B) is depressed in the second step. . Further, the wire mechanism (38) and the swing arm (36
) is also provided with a long hole-shaped flexibility (38a), and the other wire mechanism (38
) is no longer working.

[Another example]

(2) The steering operating tool (22) may be a set of levers, and its form is not specified.

◎ A fertilizing/seeding machine may be used as a paddy field working machine.

[Brief explanation of drawings]

The drawings show an embodiment of the steering/traveling operation structure for a paddy field working machine according to the present invention, in which FIG. 1 is an overall configuration diagram, FIG. 2 is a perspective view showing the linkage between the pitman arm and the swing arm, and FIG. FIG. 4 is a sectional view showing the rear wheel transmission case structure, FIG. 4 is a sectional view showing the rear axle structure, and FIG. 5 is a side view of the riding rice transplanter. (5)...Non-steering wheels, (9)...Differential mechanism, (16)...Differential lock mechanism, (18
A), (18B)... Steering brake, (
22A), (22B)... Steering operation tool,
(23), (27)...First linkage mechanism, (
32)... Steering handle, (35)...
...Second linkage mechanism.

Claims (1)

[Claims] A pair of left and right non-steering wheels (5), (5) is provided with steering brakes (18A), (18B) that can be operated independently, and is locked to the non-steering wheel differential mechanism (9). A mechanism (16) is provided, and a steering brake (18A), (
Steering operation tool (22A) linked to (18B), (22
A first linkage mechanism (B) that operates the lock mechanism (16) in the release direction in conjunction with the braking operation of B) and operates the brakes (18A) and (18B) after the lock is released.
23) and (27), and further a steering handle (32) is provided.
) A steering/travel operation structure for a paddy field work machine, which is provided with a second linkage mechanism (35) that releases the differential lock mechanism (16) in conjunction with a turning operation exceeding a set amount.