JP2600122B2 - Work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a traveling vehicle such as a tractor having a left-right steering clutch and a left-right steering brake on right and left rear wheels of a four-wheel drive type and a riding rice transplanter. It is about vehicles.

[Conventional technology]

2. Description of the Related Art Conventionally, this type of work traveling vehicle often travels straight in a field and travels, turns when reaching the edge of the field, and repeats reciprocating work travel to carry out work. To proceed with the work in this manner, a four-wheel drive configuration is adopted in order to improve the working efficiency by turning a small turn at the field edge and to reduce the drive rotation difference between the front and rear wheels so that the field can be turned without ruining the field. There is a left and right steering clutch for turning on and off the transmission of the left and right rear wheels, and a left and right steering brake for braking the left and right rear wheels, respectively. When turning in a field, the left and right steering pedals are separately operated to cut off the transmission on the left or right side of the rear wheel. A work traveling vehicle such as a riding rice transplanter, which is capable of braking and turning, and when driving on the road, operates the left and right steering pedals both left and right to brake the left and right rear wheels. That.

In the conventional working vehicle as described above, the operation of the steering clutch and the steering brake during turning, which is frequently performed in the field, causes the steering brake to operate before the steering clutch is disengaged. With this configuration, the steering brake is likely to be temporarily decelerated during turning and the steering brake is easily worn. Therefore, the steering brake is operated after the steering clutch is disengaged.

[Problems to be solved by the invention]

However, when the working traveling vehicle is configured as described above,
When traveling on the road, where the traveling resistance is much smaller than when traveling in the field and the vehicle often travels at high speed, if the left and right steering wheels are operated to operate the left and right steering pedals to apply brakes during traveling, only the left and right rear wheels are used. Is braked and the left and right front wheels are not braked, so it is difficult to stop, and a dangerous situation is likely to occur. Further, when the left and right steering pedals are operated both left and right, the steering brake is operated after the steering clutch is disengaged. Therefore, the braking action of the left and right rear wheels does not contribute to the braking of the left and right front wheels at all. Therefore, it is even harder to stop.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention solves the above problem by driving left and right front wheels 39 and 39 and driving and rotating left and right rear wheels 1.1.
Left and right steering clutches 2.2 for turning on and off the transmission of the left and right rear wheels 1.1 and left and right steering brakes 28 for braking the left and right rear wheels 1.1 respectively. Left and right steering pedals 29 and 30 are provided for the left and right steering brakes 29 and 30, respectively, for operating the steering clutches 2 left and right respectively on and off and braking the left and right steering brakes 28 and 28 respectively.
30 is configured to be freely switchable between a state operated separately for the left and right and a state operated both for the left and right, and the left and right steering pedals 29
When the left and right 30 are operated separately, the steering wheel 28 brakes the rear wheel 1 after the steering clutch 2 is disengaged. And a brake 3 for braking both the left and right steering pedals 29 and 30 before the left and right steering clutches 2 and 2 are disengaged.
This is a working traveling vehicle characterized in that it is configured to brake the 39, 39 and the rear wheels 1.1.

[Operation and Effect of the Invention] The working vehicle of the present invention operates the left and right steering pedals 29 and 30 separately for left and right when turning in a field, but in this case, after the steering clutch 2 is disengaged. The steering brake 28 brakes the rear wheel 1. When the vehicle is running on the road and the brake is applied during driving to stop the vehicle, the left and right steering pedals 29 and 30 are operated on both the left and right. In this case, the front wheels 39 and 39 and rear wheel 1.1
The brake 3 that brakes both is operated.

Therefore, according to the present invention, in the field, the left and right steering pedals 29 and 30 can be operated separately for the left and right sides to cut off the transmission on one of the left and right sides of the rear wheel 1.1 and to be able to brake and turn. This makes it possible to make a small turn, thereby improving work efficiency, making it possible to make a turn without damaging the field with a small difference in driving rotation between the front and rear wheels, and providing a left and right steering pedal 29.
When the left and right steering wheels 30 are individually operated, the steering brake 28 brakes the rear wheel 1 after the steering clutch 2 is disengaged, so that the steering brake brakes the rear wheel before the steering clutch is disengaged. With this configuration, it is possible to prevent the temporary deceleration during turning and the tendency of the steering brake to be easily worn.

In addition, while driving as described above, when driving on the road, if both the left and right steering pedals 29 and 30 are operated to apply the brakes during driving and stop, the front wheels 39 and 39
And the rear wheels 1 and 1 are both braked, so that there is no case where the left and right rear wheels are braked to make it difficult to stop unlike the prior art, and the traveling can be stopped reliably. Also,
When the left and right steering pedals 29 and 30 are both operated, the front wheels 39 and 39 and the rear wheels 1 before the left and right steering clutches 2.2 disengage.
・ Because the brake 3 that brakes 1 and 2 operates,
Even if the left and right steering clutches 2.2 are disengaged, the rear wheels 1.1 are braked by the steering brakes 28, 28, and the brake 3 is operated after the steering clutch 2.2 is disengaged. The front wheels 39, 39 and the rear wheels 1, 1 are quickly braked as compared with, so that the traveling can be stopped quickly and reliably.

〔Example〕

A riding rice transplanter according to an embodiment of the present invention will be described in detail with reference to the drawings.

The tractor arranges the front wheel 39 and the rear wheel 1 as a pair on the left and right,
A cockpit 5 and a steering handle 6 are provided on the vehicle body 4, and a seedling plant 8 is connected by a lifting link 7 at the rear. The vehicle body 4 is provided with a transmission case 9 at a front portion thereof. The transmission case 9 is provided from a prime mover 10 under the cockpit 5 via a transmission belt 11, a shaft 12, a continuously variable belt transmission 13, a main clutch 14, and the like. To the input shaft 15. A traveling output shaft 16 and a work output shaft 17 are provided on the rear side of the transmission case 9, and the input shaft 15, the traveling output shaft 16, and the work output shaft 17 are provided.
Transmission gears 18, 19, 20 and the like are provided between the transmission shafts and the like so that the output shafts 16 and 17 can be transmitted by transmission.

On the rear side of the transmission case 9, there is provided a front wheel transmission case 22 containing a front wheel transmission mechanism 21 for transmitting to a front wheel 39, and the traveling output shaft 3 is provided with a differential gear mechanism 23 at the center of the front wheel transmission case 22. Provided to transmit.

A rear wheel transmission case 24 on which the rear wheel 1 is mounted is provided with a rear wheel transmission mechanism 25 for transmitting the rear wheel 1. The shaft 27 is interlocked. The rear wheel transmission mechanism 25 is provided with a steering clutch 2 and a steering brake 28, and after the steering clutch 2 is disengaged, the steering brake 28 is actuated to allow the rear wheels 1 to stop idling or turning. is there. The safety brake 3 is provided on a shaft 27 that enters the differential gear mechanism 26 so that the rotation of the shaft 27 can be braked.

Left and right steering pedals 29 and 30 are provided below the steering handle 6, and a rotatable rotating piece 31 is pivotally attached to one steering clutch pedal 29 by a pin 32. When the connecting piece 33 is pivotally connected with the pin 34 and the rotating piece 31 is turned sideways, one end protrudes outward of the steering pedal 29, and the connecting piece 33 at the other end engages the back side of the steering pedal 30. Then, the left and right steering pedals 29 and 30 are connected.

A pedal axle 35 that pivotally supports these steering pedals 29 and 30 includes:
A brake pedal 36 for operating the safety brake 3 is pivotally supported, and its distal end is located at a position close to the back side of the rotating piece 31 having a laterally protruding posture.

The left steering pedal 29 is configured to operate the steering clutch 2 of the left rear wheel 1, and the right steering pedal 30 is configured to operate the steering clutch 2 of the right rear wheel 1. ing. In a state where the connecting piece 33 is engaged and connected across the left and right steering pedals 29 and 30, when one of these steering pedals 29 and 30 is depressed, the brake pedal is rotated by the rotating piece 31.
The safety brake 3 is actuated by pressing 36, but the safety brake 3 is braked before the left and right steering clutches 2 and 2 are not disengaged, and the safety clutch 3 is interlocked so that the steering clutch 2 does not reach the disengaged state. I have. A rod 37 connects the brake pedal 36 and the brake shifter arm 38 of the safety brake 3.

The safety brake 3 may be provided on the traveling output shaft 16 so that the safety brake 3 acts on the front wheels 39 together with the rear wheels 1.

In FIG. 4, the safety brake 3 is in the form of a multi-disc, and the rotation of a brake shifter arm 38 causes an operating body 40 fitted on the shaft 27 to be pressed against a friction plate to thereby transmit the transmission case 24.
And the integral seat 41 is braked. The steering clutch 2 can be engaged with the steering clutch 2 fitted to the transmission shaft 43 in the rear wheel transmission case 24 by engaging the bevel gear 42 from the rear end of the shaft 27. Shifter
By moving the steering clutch 2 to the steering brake 28 side by moving the steering clutch 28 to the steering brake 28 side by 44, the brake 28 in the form of a multi-disc form is moved to the rear wheel transmission case. The structure is such that it is sandwiched between the 24 seats 45 and frictionally braked. Clutch shifter 44
Is linked to the steering pedals 29 and 30.

The seedling plant 8 includes a seedling tank 46 for accommodating the seedlings, a seedling planting device 47 for separating and inserting the seedlings supplied from the seedling tank 46, a transmission case 48 having a power transmission mechanism inside for transmitting power to these, and supporting these. And has a float 49 or the like that slides on the soil surface, detects the contact pressure of the float 49 with the soil surface, switches the hydraulic valve 50, expands and contracts the hydraulic cylinder 51, and moves the lifting link 7 up and down. The seedling plant 47 is controlled and linked to maintain a constant height above the soil surface. The work output shaft 17 is connected to a transmission case 48 via a clutch 53, a universal shaft 52, and the like.
It is linked to the input shaft inside.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a plan view showing a transmission mechanism, FIG. 2 is an enlarged perspective view of a main part, FIG. 3 is an overall side view, and FIG. It is an expanded plan sectional view of the principal part shown. In the drawing, reference numerals 1.1 are left and right rear wheels, 2.2 is a left and right steering clutch, 3 is a brake, 29 and 30 are left and right steering pedals, 39 and 39.
Indicates left and right front wheels, and 28 and 28 indicate left and right steering brakes.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 60-9770 (JP, U) JP 49-19383 (JP, B1)

Claims (1)

(57) [Claims] The vehicle has left and right front wheels 39 which are driven and rotated, and left and right rear wheels which are driven and rotated.
・ Left and right steering clutch for turning on and off one transmission
And left and right steering brakes 28, 28 for braking the left and right rear wheels 1.1, respectively, are provided. The left and right steering clutches 2, 2 are turned on and off respectively, and the left and right steering brakes 28, 28 are respectively braked. The left and right steering pedals 29 and 30 to be operated are provided separately for the left and right, and the left and right steering pedals 29 and 30 are configured to be freely switchable between a state where the left and right steering pedals are individually operated and a state where both the left and right steering pedals are operated. When the left and right pedals 29 and 30 are operated separately, the steering brake 28 brakes the rear wheel 1 after the steering clutch 2 is disengaged.
A brake 3 for braking both the front wheels 39 and the rear wheels 1.1 is provided. When the left and right steering pedals 29 and 30 are operated left and right, the left and right steering clutches 2 and 3 are provided. A traveling vehicle for working, characterized in that the front wheels 39 and the rear wheels 1.1 are braked before the vehicle 2 is cut off.