JPH0544182Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a rear wheel reduction device for a rice transplanter.

(Prior Art) In the case of a conventional riding rice transplanter, the planting part is towed by the passenger vehicle body, and when turning, the steering wheel and handbrake are operated to turn.

(Problem that the invention aims to solve) In the conventional rice transplanter as described above, the speed of the rear wheels is greater than the front wheels when turning, making it impossible to perform ideal turns. Because the vehicle turned while being pushed from the ground, there was a problem in that the front wheel marks were dirty and pushed mud. For this reason, Japanese Patent Application Laid-Open No. 60-203534 proposes a system in which the rear wheels are rotated at a low speed by operating a turning operation tool.

However, since a one-way clutch is not used on the rear wheel drive shaft, the gears may reverse or slip during the transition from high speed to low speed, preventing a forced and reliable power transmission, resulting in a smooth transition from high speed to low speed. There is no hope of transition, and the structure has become complicated.

(Means for solving the problem) Therefore, the technical problem of this project is to create a rice transplanter that not only ensures reliable power transmission when changing from high speed to low speed, but also has a simple structure and can ideally rotate when turning. The technical means of this proposal to solve this technical problem is a clutch operated by a turning operation tool that turns the aircraft. This is a rear wheel reduction device for a rice transplanter, which is provided with a one-way clutch that is engaged only when driving the wheels at a low speed and can drive the rear wheel drive shaft at a low speed.

(Effect of the invention) According to this technical means, when turning operation tools such as the steering wheel and brake pedal are operated, the rear axle can be rotated at a low speed via the rear wheel reduction mechanism. , the rear wheels can be decelerated to make an ideal turn, so the wheel tracks are not dirty and unnecessary load is not expended. It has the characteristic of being able to turn smoothly and easily without running out of torque even when turning.

In addition, there is a clutch on the rear wheel drive shaft that can be released from the high-speed drive side using a turning operation tool, and a one-way clutch that engages only when driving the rear wheels at low speeds, allowing the rear wheel drive shaft to be driven at low speeds, allowing straight-line steering. Even if the one-way clutch is used and the rear wheel drive shaft rotates at high speed, when the clutch operated by the turning operation device is released, the one-way clutch rotates the rear wheel drive shaft at a low speed, reversibly reducing the shock at high speed. There is a characteristic that Moreover, since a one-way clutch is used, the rear wheel deceleration is simple, and since the one-way clutch can stop the opposite rotation, the gears will not reverse when switching from high speed to low speed and there will be no slip, ensuring reliable deceleration. This allows for smooth turning.

(Example) The embodiments shown in the drawings will be described below.

First, to explain the entire riding rice transplanter, 1 is a passenger vehicle body, and a planting section 3 is connected to the rear part of this passenger vehicle body 1 via a lift mechanism 2.

An engine 5 is mounted on a vehicle body frame 4, and front wheels 6 are located below the engine 5. Reference numeral 7 denotes a transmission case, and there is a transmission case 8 on both left and right sides of the transmission case 7, and a rear wheel 9 is provided at the rear end of the transmission case 8.

10 is a driver's seat, 11 is a footrest, and 12 is a steering wheel.

A top link 13 and a lower link 14 of a link frame are attached to the lift mechanism 2, and the planting part 3 is raised and lowered by swinging the links 13 and 14 by expansion and contraction of a hydraulic cylinder.
The planting section 3 consists of a seedling stand 15, a float 16, and a transmission case 17. Further, 18 is a rotary case, and 19 is a planting arm.

The above-mentioned transmission device will be explained based on FIG. 2.
A pulley 22 is driven via the hydraulic pump 2
3 is driven.

This hydraulic pump 23 is used to send hydraulic oil to the elevating and lowering parts of the planting section.

A split pulley 25 is also provided on the shaft 24 of the pulley 22, and a split pulley 27 is driven from this via a belt 26.

Split pulley 27 also drives shafts 29, 30 via a main clutch 28 and a gear mechanism within transmission case 7.

The split pulley 27 is connected to a clutch petal (not shown), and is configured to be able to continuously change gears so that when the clutch pedal is depressed, low-speed transmission occurs, and when the clutch pedal is released, high-speed transmission occurs.

A gear 31 driven by a gear mechanism in the transmission case 7 drives a propeller shaft 32, and the front wheels 6 and rear wheels 9 are driven via differential gear mechanisms 33 and 34 in the differential case.

Reference numeral 35 indicates a gear mechanism within the transmission case 8 for driving the rear wheels, and reference numerals 36 and 37 indicate drive shafts for the front and rear wheels. Note that the shaft 30 is a planting drive shaft, and the propeller shaft 32 is a front wheel drive shaft.

In the present invention, in the rice transplanter as described above, when the turning operating tool is operated, the rear axle is caused to rotate at a low speed via the rear wheel reduction mechanism.

That is, in FIG. 3, the high-speed side gear 47, which is always in mesh with the gear 31 of the propeller shaft 32, which is the front wheel drive shaft, during straight forward steering, can be directly connected via the clutch 52 to the shaft 50 that drives the rear axle. The clutch 52 connects the lever 44 and the link 4 from the yoke 43 of the steering wheel 41.
5, which can slide on the shaft 50 through the gear 3.
A low-speed gear 48 meshing with a gear 49 coaxial with the gear 1 is directly connected to a shaft 50 via a one-way clutch 51. Therefore, during straight-ahead steering, the shaft 50 rotates at high speed with the gear 47 overcoming the one-way clutch 51;
When the shaft 50 is released, the shaft 50 is rotated at a low speed by a one-way clutch 51 via gears 49 and 48. Therefore, by using a one-way clutch, the shock at high speed can be made as small as possible.

From the above, when the steering wheel 41 is operated, the rear wheels are decelerated, and an ideal turn is made when turning.

[Brief explanation of the drawing]

FIG. 1 is an overall front view of the rice transplanter, FIG. 2 is an explanatory diagram of the transmission device, and FIG. 3 is an explanatory diagram showing the proposed device. DESCRIPTION OF SYMBOLS 1... Passenger vehicle body, 2... Lift mechanism, 3... Planting part, 4... Vehicle body frame, 5... Engine, 6
...Front wheel, 7...Mission case, 8...Transmission case, 9...Rear wheel, 20, 22...Pulley, 2
1...Belt, 24...Shaft, 25, 27...Split pulley, 26...Belt, 32...Propeller shaft, 4
1... Steering wheel, 31, 47... High speed side gear, 49, 48... Low speed side gear, 50...
Shaft driving the rear axle, 52...Clutch, 51...
...One-way clutch.

Claims (1)

[Scope of utility model registration request] The clutch is operated by a turning control tool that turns the aircraft, and is a one-way clutch that engages the rear wheel drive shaft, which can be disengaged from the high-speed drive side, only when the rear wheels are being driven at low speeds, and can drive the rear wheel drive shaft at low speeds. A rear wheel reduction device for a rice transplanter.