JPS6242823Y2 - - Google Patents

Description

[Detailed description of the invention] The invention consists of a pair of left and right front wheels that are driven via a differential device and can be freely steered, and a pair of left and right rear wheels that can be independently driven and stopped by a steering clutch. Regarding a riding rice transplanter equipped with

The riding rice transplanter with the above configuration drives the left and right rear wheels at a constant speed regardless of the difference in propulsion load, so it has high straight-line performance on soft ground, and since it does not use a differential device, there is little rear wheel drive loss. Furthermore, when the inside steering clutch is disengaged and the aircraft makes a sharp turn, the outer rear wheels are not driven at double speed, so the front wheels are backed by the outer rear wheels, which can make the mud surface rough. can be avoided.

However, when the rear wheels are driven via a steering clutch, as in the case where the rear wheels are driven via a differential device, when the inner steering clutch is disengaged and the aircraft turns, the outer rear wheels are Due to the double speed drive, there is no traction force to push the front wheels from behind, so when the aircraft turns, the front wheels slip,
In other words, in order to make a sharp turn at the edge of a ridge in a wet field and turn the vehicle body into a U-turn, in the above driving mode, the front wheels must be largely steered, and the steering clutch of the rear wheel on the inside of the turn must be disengaged. Become. In this case, the rear wheels on one side (on the outside of the turn) are used to drive the vehicle body while turning, and the front wheels are driven to move laterally, so the lateral deviation of the front wheel on the outside of the turn becomes particularly large, and the propulsion load on the front wheel on the outside of the turn increases. In deep wet fields or wet fields with high viscosity, the propulsion load on the front wheel on the outside of the turn may be extremely larger than the propulsion load on the inside of the turn. In such a situation, the rotation of the front wheel on the outside of the turn will be reduced. When the vehicle stops, only the front wheel on the inside of the turn is driven at double speed via the differential device, resulting in a slip condition, and the front wheels are no longer able to exert propulsive force, resulting in a lack of overall propulsive force, resulting in an extremely low turning speed. , there is an inconvenience that it becomes impossible to turn.

SUMMARY OF THE INVENTION An object of the present invention is to fully utilize the characteristics of driving the front wheels through a drive device and the rear wheels through a pair of left and right steering clutches.

The characteristic structure of this invention to achieve the above purpose is as follows:
A differential lock mechanism is provided for the differential device, and the differential lock mechanism is operated in conjunction with each of the pair of left and right steering clutch pedals when each of the steering clutch pedals is operated to a rear wheel drive stop position. This structure has the following effects.

In other words, when turning sharply by steering the front wheels significantly and disengaging the steering clutch of one rear wheel, the front wheel differential device is activated by disengaging the steering clutch of the inner rear wheel. Locked. As a result, the left and right front wheels are driven at a constant speed regardless of the difference in propulsion load, so a state with less slip is brought about and the turning can be continued.

Since the differential mechanism for the differential gear is linked to the steering clutch pedal, when operating the differential mechanism independently, one foot depresses the steering clutch while the other foot depresses the differential pedal. There is no need to do this, and there is no need to operate the aircraft in an unstable position with both feet on the pedals.

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a seedling planting section 3 is vertically swung by a hydraulic cylinder 4 at the rear of a traveling vehicle having a pair of left and right steering front driving wheels 1a, 1b and driving rear wheels 2a, 2b. The rice transplanters are connected to each other so that they can be raised and lowered by a link mechanism 5 that can be moved up and down, and are configured to transmit rotational power from the traveling body to the seedling planting section 3, thereby configuring a riding rice transplanter capable of planting four rows. be.

As shown in FIG. 2, the transmission structure for the front and rear wheels 1a, 1b, 2a, and 2b includes an auxiliary transmission capable of switching the output of the engine 6 between two high and low speeds, and a main clutch. The transmission is transmitted via a double tension belt clutch 7, which also serves as a driving transmission, to a traveling transmission _M1 that can be switched to two forward speeds and one reverse speed.
The output of M ₁ is transmitted to the differential mechanism (differential device) 8 for the left and right front wheels 1a, 1b, and the rotational force of the input gear of this differential mechanism 8 is transmitted to the rear wheel transmission M ₂ . .

As shown in FIG. 3, a bevel gear mounting member that rotates integrally with the input gear of the differential mechanism includes a differential gear 10 fitted externally with a spline so that it can rotate and slide freely on one output shaft 9 of the front wheel differential mechanism 8. 11, the differential lock mechanism 12 is configured to be activated by engaging with the traveling transmission.
It is installed inside the case 13 of _M1 , and is interlocked with the operating sliding fork 14 of the differential lock device 10 via a first swing interlocking tool 15, a push/pull rod 16, and a second swing interlocking tool 17. A certain first part that can be raised and lowered freely.
By operating the operating pedal 18, the differential lock mechanism 12 is activated.
It is designed to perform the following operations.

The rear wheel transmission M ₂ includes left and right rear wheels 2a,
A pair of steering clutches 19a, 19b are provided for separately driving and stopping the two steering clutches 19a, 19b to direct the aircraft.
The respective rocking operation tools 20a or 20b are individually linked to a pair of swingable left and right second pedals 21a, 21b, and in conjunction with the steering operation of the front wheels 1a, 1b,
By depressing the second pedal 21a or 21b for the rear wheel 2a or 2b corresponding to the inner side of the turn, the vehicle can make a small turn.

When the second pedal 21a or 21b is operated to the rear wheel drive stop position, the first rocking interlocking device 15 is configured to be operated to the differential lock mechanism operating position, and both steering clutches 19 are configured to be operated.
The first rocking interlocking tool 15 and both wheels are connected to each other by an interlocking mechanism 23 provided with a long hole 22 to enable the first pedal 18 to operate the differential lock mechanism 12 without turning off the first pedal 18. The second pedals 21a and 21b are operated in conjunction with each other to operate the differential lock mechanism 12 when the second pedal 21a or 21b is operated to the rear wheel drive stop position with respect to both second pedals 21a and 21b, respectively. This enables the first pedal 18 to operate the differential lock mechanism 12 independently, and the second pedal 21a or 21b to activate the differential lock mechanism 12 and the rear wheels 2a or 2b. It is designed so that a linked operation can be performed to bring the drive to a stopped state.

The interlocking mechanism 23 can be changed to an electric type or a hydraulic type.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings show an embodiment of the riding rice transplanter according to the present invention, in which Fig. 1 is a side view of the riding rice transplanter, Fig. 2 is a transmission system diagram, and Fig. 3 is a diagram of the operation structure of the differential lock mechanism and steering clutch. . 1a, 1b...Front wheels, 2a, 2b...Rear wheels, 8...Differential device, 12...Diff lock mechanism,
21a, 21b... Steering clutch pedal.

Claims (1)

[Scope of utility model registration request] A pair of left and right front wheels 1a, 1b which can be freely steered are driven via a differential device 8, and a steering clutch 1.
In a riding rice transplanter equipped with a pair of left and right rear wheels 2a, 2b which can be independently driven and stopped by wheels 9a, 19b, a differential lock mechanism 12 is provided for the differential device 8, and the differential mechanism 12 is connected to the left and right rear wheels 2a, 2b. A pair of steering clutch pedals 21
A riding rice transplanter characterized in that each of the steering clutch pedals 21a and 21b is connected to a state in which the steering clutch pedals 21a and 21b are operated in conjunction with being operated to a rear wheel drive stop position.