JPH0741665Y2 - Self-propelled steering wheel device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled steerable wheel device which enables stable straight traveling by a stabilizing means when traveling straight.

[0002]

2. Description of the Related Art Conventionally, a self-propelled steerable wheel device rotatably supports a wheel by a fork, and a steering rod is connected to the fork, and an upper portion of the steering rod is connected to the steering rod. The steering wheel is attached directly or via a speed reducer, and a drive motor is attached to the fork so that the wheels can be driven by this drive motor. And stable steering of this wheel device
Japanese Patent Laid-Open No. 61-205559 discloses a method of controlling the operation.
The rotation of the rudder shaft is reduced by the gear mechanism, and the required angle is applied to the outer peripheral surface.
Has a plurality of bilaterally symmetrical cam surfaces, and the inner surface
Transmission to a cam ring that has a gear that meshes with the gear mechanism
Then, press the cam surface with a pusher to make the steering shaft neutral.
The initial torque is applied at the position and
Torque that gradually decreases as the steering wheel that rotates
The steering stabilizer of the vehicle configured to add
It is disclosed. Furthermore, the machine issued on February 10, 1948
Pages 259 to 265 of the Machinery and Equipment Design Handbook (Publisher Taikaku)
As a click motion and its application example,
Use a pin-shaped member whose step is elastically pressed against the cam body.
And are listed.

[0003]

In the above-mentioned conventional wheel device, the direction change during traveling can be freely performed by operating the steering wheel. However, when traveling straight, the traveling operator manually moves the steering wheel to a position where he or she can proceed straight. You have to keep it,
Also, you can manually return the handle that is not in the straight-ahead position to the straight-ahead position.
It is slow to return, and the position cannot be returned accurately, so the operation of finely adjusting the steering wheel and making corrections is unavoidable, and it takes time for the vehicle to travel straight ahead accurately. This is especially true
Many straight lines such as road marking line coating devices require accuracy.
When used in a device that has
Even if it is applied to
Therefore, the first straight part is applied in a somewhat meandering state.
Or, even if you move to an accurate straight line, the steering wheel will
Must always be held in position by hand,
The wheel device has problems in straightness and workability.

Further , in Japanese Patent Laid-Open No. 61-205559,
Positively move the steering wheel that is not in the straight-ahead position to the neutral position (straight-ahead position
Can be returned to and held in place, but has a complicated gear mechanism.
Has the drawback of being extremely expensive due to the use of
It was In addition, the click motion mechanism in the mechanical equipment manual
Is to move at high speed, stop at a certain position, vibrate, etc.
It is used to avoid loosening or movement due to
Use it for the wheel device instead of returning it at any position.
Even if you use it, the handle that is not in the straight position will not automatically return,
It had a problem that it had to be put back in.

The present invention has been made in view of the above-mentioned problems of the prior art, and is to solve this problem. That is, when the vehicle travels straight ahead, the rising of straight ahead travel is accelerated and the steering wheel is not always held by hand. (EN) It is possible to provide a self-propelled steerable wheel device capable of stable straight traveling. Other purposes are complicated
Self-propelled steerable wheels with simple, inexpensive and stable means
To provide the equipment.

[0006]

According to the present invention, a fork (2) for rotatably supporting a wheel (1) or a steering rod (6) connected to the fork (2) is fixed to them. Do
Gradually progressing as the entire outer circumference moves away from the recess (91a)
A heart-shaped cam (91) with a large core diameter and the heart-shaped cam
A pin (92) elastically pressed against the outer periphery of the frame (91),
A rotatable lever (94) that supports the pin (92) and the lever (94).
Composed of a spring (95) for elasticizing the bar (94)
A straight traveling stabilizing means (9) is provided.

[0007]

Next, the operation of the present invention will be described with reference to the drawings corresponding to the embodiments. When the steering wheel (7) is turned and the direction is changed, the wheel (1) is not oriented in the straight direction, and therefore
The concave portion (91a) of the T-shaped cam (91) is rotated to a position separated from the pin (92). In this state, from the handle (7)
When you release your hand, the distance from the recess (91a) increases as you move left and right.
The heart-shaped cam (91) with a large center radius is
Pressed pin (92) automatically and quickly turns straight.
The steering rod (6) is also rotated accordingly. Eventually, the recess (91a) of the heart-shaped cam (91) approaches the pin (92), and when approaching to a certain extent, it moves toward the center of the recess (91a) that has gently fallen, and the lever (94) always moves the ball. The pin (92) that is pressed against it spontaneously falls. At this time
The T-shaped cam (91) stops rotating after abruptly rotating. In other words, the handle (7) will automatically
It is turned straight ahead at high speed. When the pin (92) falls to the center of the recess (91a), the pin (92) becomes stable, and the heart cam (91) also stops rotating,
Heart-shaped cam (91) unless you turn the handle (7) by hand
Is held in a stable straight position. As a result, the wheel (1) can stably travel in an accurate straight traveling state.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral (1) is a wheel, (2) is a fork that rotatably supports the wheel (1) below, and (3) is an axle of the wheel (1). Reference numeral (4) is a drive unit attached to the fork (2), which normally uses a hydraulic or electric motor. (5) is a belt for transmitting the power of the driving device (4) to the wheels (1),
Reference numeral (6) is a steering rod whose lower end is connected to the upper end of the fork (2), and the turning movement of the steering rod (6) is controlled by the fork (2).
It is connected so as to rotate in conjunction with. Reference numeral (7) is a handle, and (8) is a speed reducer provided between the steering rod (6) and the handle (7) to lighten the rotating operation of the handle (7). (9) is a stabilizing means, which is fixed to the steering rod (6) or the fork (2),
There is a recess (91a) on the outer circumference, and from this recess (91a) to the left and right
The heart- shaped cam (91) whose center radius of the outer circumference is gradually increased with increasing distance, the pin (92) constantly elastically pressed against the outer circumference of the heart-shaped cam (91), and the pin (92 ) Is supported at a right angle by a lever (94) rotatable about a support shaft (93), and a spring (95) for elastically imparting the lever (94). Since the pin (92) is pressed against the heart cam (91) and is worn, a roller pin is usually used. When the pin (92) is inserted in the recess (91a) of the heart cam (91), the heart cam (91) is operated so that the wheel (1) is in a straight traveling state. Mukai (6)
Alternatively, it is fixed to the fork (2) .

[0009]

As described above, according to the present invention, the outer peripheral shape is concave (91
The center radius gradually increases with increasing distance from left to right.
By providing the stabilizing means (9) having the heart-shaped cam (91) , no matter which position the handle (7) is released when returning the handle (7) not in the straight traveling position to the straight traveling position, It is possible to automatically return to the straight-ahead position, the handle (7) should be in the straight-ahead position, there is no need to make repeated adjustments, and the operation of the handle (7) is not necessary during straight-ahead traveling. Easy to use and stable according to the present invention
The structure of the means (9) is more than that using the conventional gear mechanism.
Since it has an extremely simple structure, it can be made inexpensive and
Maintenance is also easy.

In addition, a stable straight traveling state leads to a quick start-up, there is no meandering to the left and right unlike the conventional case, and the hand can be released from the steering wheel (7) even during straight traveling, When it is used for a self-propelled road segment applicator with a lot of straight-ahead work, the straight line drawn is straight and does not meander from the beginning, and the handle (7) does not need to be distracted. By doing so, it is possible to concentrate on the adjustment work such as the construction speed and the supply amount of the road material, and good construction can be performed.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Wheel 2 Fork 4 Drive Device 6 Steering Rod 7 Handle 8 Reducer 9 Stabilizer 91 Heart Cam 91a Recess 92 Pin 94 Lever 95 Spring

Claims (1)

[Scope of utility model registration request] 1. A fork (2) supporting a wheel (1).
To the handle (7) either directly or through the reducer (8)
Install the steering rod (6) to be connected with, and the follower - propelled steerable wheel device having a click drive said driving wheels (1) to (2) (4), said steering Rod
(6) Or fixed to the forks (2)
As the entire outer circumference moves away from the recess (91a) left and right
A heart-shaped cam (91) whose core diameter is gradually increased, and the heart
Pin (92) elastically pressed against the outer periphery of the mold cam (91)
And a rotatable lever (94) that supports the pin (92).
And a spring (95) for elastically applying the lever (94),
It is characterized by the provision of a straight traveling stabilizer (9)
A self-propelled steerable wheel device.