JPH0353714Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a speed sprayer that can easily travel on rough terrain, and more specifically, a three-wheeled speed sprayer that has a small turning radius and can drive double front tires. Regarding.

(Prior Art) Ensuring stable running performance by driving the front wheels on uneven ground is necessary for a speed sprayer that disinfects while patrolling orchards on steep slopes. A three-wheeled speed sprayer is especially suitable for such applications as it has a small turning radius, but if it only has one front wheel, it is easy to turn the steering wheel while driving.
When the vehicle is running at low speeds or when the vehicle is stopped, the tires are forced to rotate while the ground pressure remains high even though they are not rotating, resulting in the disadvantage that the steering wheel is heavy and difficult to turn.

Therefore, it is necessary to use double tires for the front wheels so that even when the vehicle is stopped, the tires rotate in a line-contact manner so that the steering wheel can be easily turned.

By the way, if the front wheels of such double tires arranged narrowly between each other are used as driving wheels (the rear wheels are also used as driving wheels, it becomes a four-wheel drive type),
There is a problem in that when the steering wheel is turned, the double tires come into contact with the drive shaft, which limits the rotation angle of the tires.

In other words, there is no problem if the tires are spaced sufficiently apart from each other by the width of the vehicle, but with narrow double tires like the one described above, when adopting the conventional mechanism in which the drive shaft is installed horizontally, the gap between the tires becomes When turning the steering wheel, one of the tires comes into contact with the horizontal drive shaft, which is connected to the constant velocity joint of A problem arises in that the requirements of speed sprayers cannot be met.

(Summary of the invention) This invention was devised in view of the above-mentioned problems, and its purpose is to make the front wheel a double-tire drive wheel with low ground resistance, and to make the turning angle of the steering wheel adjustable. Our goal is to provide a three-wheel speed sprayer with a wide range of approximately 140 degrees.The feature of this three-wheel speed sprayer is that the rear wheels are two driving wheels, and the front wheels are double tires, and the front wheels are connected to the front wheels through a differential gear box. In order to drive the differential gear box, the differential gear box itself or a hollow shaft directly connected to it is inserted into the vehicle chassis so as to be horizontally rotatable and serves as a handle shaft, and the hollow handle shaft is inserted from inside the differential gear box to drive. Provide a shaft, use the handle shaft as a handle,
This is where the drive shaft is connected to the motor via a clutch.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

In Figures 1 and 2, speed sprayer 1
The front wheels of 0 are double tires 12, 12', and the double tires are connected via the lower part of a vertically long differential gear box 14. At the bottom of the differential gear box 14, a pair of left and right axles 18 are connected to a pair of large differential gears 16, 16'.
18', which is connected to said double tires 12, 12'. Differential large gear 16,
A differential pinion 20 that rotates the differential gear box 16' is coupled to be rotated by a reduction gear 22, and the reduction gear 22 is connected to the differential gear box 1.
4 meshes with the upper reduction gear 24, reducing the reduction gear 2
4 is fixed to the lower end of the drive shaft 26. Drive shaft 2
6 extends vertically upward and is supported by a hollow shaft 28 directly connected to the top of the differential gear box. The hollow shaft 28 stands upright and is inserted into and fixed to the front end of the frame 30 of the speed sprayer 10 via a roller bearing 32 that can withstand thrust loads. An arm 40 is connected to an arm 42 fixed to the upper part of the hollow shaft 28 through a hole 44 perpendicularly bored therein, and the direction can be changed by about 140 degrees left and right by turning the handle 34. A sprocket 46 with a solenoid is attached as a clutch to the drive shaft 26 which passes through the inside of the hollow shaft 28 and protrudes upward, and a sprocket 46 with a solenoid is mounted on its lower surface opposite to the sprocket 46 with a solenoid and is driven by a hydraulic motor 48. 50.

To give another example, the differential gear box 14 itself has a vertically elongated cylindrical shape, and can be rotatably inserted and fixed directly into the frame without a hollow shaft, and the arm 42 can be attached to the differential gear box. 14 can be fixed directly.

(Effects of the invention) As described above, the invention does not require the use of a knuckle arm or a steering rod, and uses a mechanism such as steering from the outside of the double tires, so that the front wheels can only be turned by about 60 degrees left and right. By using the differential gear case itself or a hollow shaft directly connected to it as the handle shaft, and inserting the drive shaft into the hollow shaft, it is possible to achieve a small turning radius of 140° left and right, which is required for a three-wheeled speed sprayer. It is possible to obtain a three-wheeled speed sprayer with a simple structure, which ensures the stability of the vehicle and also has the feature that the steering wheel is easy to operate when running at low speed or when the vehicle is stopped.
Also, it can be rotated even if there is a difference between the inner rings.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

Both FIG. 1 and FIG. 2 are a partially sectional front view and a partially omitted front view of a front wheel of a three-wheeled speed sprayer. 10...Speed sprayer, 12,12'...
...Double tires, 14...Differential gear box, 16, 16'...Differential large gear, 18,
18'...Axle, 20...Differential pinion gear, 22...
Reduction large gear, 24... Reduction small gear, 26... Drive shaft, 28... Hollow shaft, 30... Frame, 32...
... Roller bearing, 34 ... Handle, 36 ... Pitman arm, 38 ... Hollow shaft, 40 ... Third arm, 42 ... Arm, 44 ... Hole, 46 ...
Sprocket with solenoid, 48... Hydraulic motor, 50... Sprocket.

Claims (1)

[Scope of utility model registration request] In a three-wheel speed sprayer, the rear wheels are two driving wheels, the front wheels are double tires, and in order to drive the front wheels via a differential gearbox, the differential gearbox itself or a hollow shaft directly connected to it is mounted on the chassis. The handle shaft is inserted through the shaft so that it can rotate horizontally, and the drive shaft is provided by inserting it through the hollow handle shaft from inside the differential gear box.The handle shaft is connected to the handle, and the drive shaft is connected to the motor via the clutch. A three-wheeled speed sprayer.