JPH0422779Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a steering device for a children's vehicle.

(Prior art and its problems) Conventionally, for example, the steering device of a children's four-wheeled vehicle was
As shown in the figure, knuckle arms 21, 21 are rotatably attached to both ends of the wheel holding shaft 20, and a steered wheel 2 is attached to one end of each knuckle arm 21.
6, the other end is connected to the end of the tie rod 22, and the center of the tie rod 22 is connected to an operating rod 23 that can be rotated left and right, and the operating rod 23 is connected to the steering shaft 25 of the steering handle 24. The structure is such that it is operatively connected to. During steering, for example, when the steering handle 24 is rotated, the operating rod 23 rotates to the right, the tie rod 22 moves to the right, and the knuckle arm 21 rotates, as shown by the dotted line in the figure. As a result, the steering wheels 26, 26 turn to the right. If the steering wheel 24 is rotated to the left, the steering wheels 26, 26 will turn to the left for the same reason.

However, conventional steering devices have the following drawbacks.

(a) The number of parts increases.

(b) Machining accuracy is required because both steering wheels must rotate in parallel.

(c) Since the movement of the steering wheel is transmitted through a complex mechanism that transmits it to the knuckle arm via the steering shaft, operating rod, and tie rod, errors are likely to occur during transmission, and for this reason, the steering is not as smooth. isn't it.

(d) All four wheels are not always in contact with the road surface. In particular, one of the steering wheels may lift off the road surface, potentially making driving unstable.

(Technical Problem of the Invention) The technical problem of the present invention is to provide a steering device for a children's vehicle that can eliminate the above-mentioned drawbacks with a simple structure.

(Means for Solving the Problems) In order to solve the above problems, a steering device for a children's vehicle according to the present invention has a steering wheel supported at both ends of an axle, and rotates with respect to the vehicle body in conjunction with a steering wheel. A steering shaft is mounted on the steering shaft, the tip of the steering shaft is bent into a dogleg shape, and the bent end is supported on a bearing member provided substantially perpendicular to the axle of the steering wheel. shall be.

(Operations and effects of the invention) As described above, according to the invention, when the steering shaft is rotated by turning the steering wheel, the bent end of the steering shaft moves left and right in accordance with the direction of rotation. Since it rotates, the axle provided at right angles to this bent end also rotates left and right, allowing you to steer as you wish.

In this way, in the steering system of the present invention, the steering wheels are attached to both ends of the axle in a simple manner.
Since steering is performed by rotating the axle, the structure is simple and the number of parts is small.Moreover, since the movement of the steering wheel is immediately transmitted to the axle, there is little transmission error and the machining accuracy is also low. Not required. Additionally, the axle can rotate independently of the steering axis. In other words, since the steering shaft is provided on the vehicle body, the axle can rotate independently with respect to the vehicle body. Therefore, even if one of the steering wheels runs on a stone and the axle tilts, the vehicle body will not tilt and the vehicle will maintain stable running. In addition, the tip of the steering handle is bent into a dogleg shape, and this bent end is supported in the center of the axle, so it has good straight-line performance (details will be described later).

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, the symbol A indicates a four-wheeled vehicle for children.
1 is a vehicle body, 2 is a seat, 3, 3 are drive wheels (rear wheels), 4 is a pedal, 6 is a drive chain, 7 is a steering handle, and 8, 8 are steering wheels (front wheels).

The steering system of this children's four-wheeled vehicle is constructed as follows.

First, the steered wheels 8, 8 are supported on both ends of an axle 10. Next, in the center of the axle 10 is an axle 10.
A cylindrical bearing part 11 that is orthogonal to this is fixed, and a steering shaft 12 is supported on the bearing part 11 . The steering shaft 12 is formed integrally with the steering handle 7, and is supported by a bearing portion 13 of the vehicle body 1 at the intermediate portion thereof, and furthermore, the tip thereof is bent into a “dog” shape, and the bent end portion 12a is formed as described above. It is supported by a bearing portion 11 of an axle 10 .

In the above-mentioned steering device configuration, when the traveling direction of the four-wheeled vehicle A is turned to the right, when the steering wheel 7 is turned and the steering shaft 12 is rotated in conjunction with this,
As shown in FIG. 2, the bent end portion 12a of the steering shaft 12 rotates to the right around the bent portion A while freely rotating within the bearing portion 11 according to the direction of rotation. The axle 10 provided perpendicularly to the bent end 12a also rotates to the right around the bent portion A.
Therefore, it is possible to run the vehicle to the right. To run the vehicle to the left, the steering wheel 7 may be operated in the opposite direction.

As described above, the steering wheels 8, 8 are attached to both ends of the axle 10 and are steered by directly rotating the axle 10 with the steering handle 7, so the structure is simple and the number of parts is reduced. Not only does the number of points need to be reduced, but since the movement of the steering wheel 7 is immediately transmitted to the axle 10, the movement is smooth and transmission errors are small, so that machining accuracy is not required.

Further, according to the above-mentioned steering device, since the bearing portion 11 at the center of the axle 10 rotatably supports the bent end portion 12a of the steering shaft 12, the axle 10 is connected to the steering shaft 12.
2 and can be rotated independently. In other words, since the steering shaft 12 is provided on the vehicle body 1, the axle 10 can rotate independently with respect to the vehicle body 1. For this reason,
Even when driving on an uneven road surface, even if one steering wheel 8 rides on a stone and the axle 10 is tilted, the vehicle body 1
does not tilt and therefore provides very stable running.

Furthermore, since the tip of the steering handle 7 is bent into a dogleg shape, when the steering handle is rotated and the steering shaft 12 is rotated, the bent end is bent as shown in FIG. 4a and b. Theoretically, the tip B of 12a will draw a circular locus in which B1, B2, and B3 are continuous. In other words, the bent end 12a is in a straight line state (at this time, the tip B is at the same height level as the bent part A)
By changing the direction from left to right, the tip B will be lower than the height level before rotation.
Relatively, the height of the bent portion A (and the vehicle body 1) increases by that amount, and rises above the road surface.
As a four-wheeled vehicle, the most stable state is when the bent part A is at the lowest height level (the tip B of the bent end 12a is the highest), that is, in the straight-ahead position. With respect to the above-mentioned changes caused by the rotation of the portion 12a, a restoring force against the rotation always acts on the steering shaft 12. Therefore,
Since a restoring force always acts on the steering shaft 12 so that the steered wheels 8, 8 face straight ahead, the straight running performance is very good.

In addition, although the above-mentioned example is an example of a four-wheeled vehicle, the present invention is not limited thereto. For example, the vehicle may be a tricycle with two steering wheels and one driving wheel.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a four-wheeled vehicle for children according to the present invention;
Fig. 2 is a plan view showing the main parts of the steering system of the four-wheeled vehicle, Fig. 3 is an explanatory diagram of the main parts showing the state of absorption of unevenness on the road surface, and Fig. 4 a and b show the restoring state of the steering axis. FIG. 5 is an explanatory diagram of a conventional steering device. Symbol A... Children's four-wheel vehicle, 7... Steering handle, 8... Steering wheel, 9... Bearing portion, 10... Axle, 12... Steering shaft, 12a... Bent end.

Claims (1)

[Scope of utility model registration request] In addition to bearing the steering shaft on both ends of the axle,
A steering shaft that rotates in conjunction with a steering wheel is supported on the vehicle body, the tip of the steering shaft is bent into a dogleg shape, and the bent end is provided approximately at right angles to the axle of the steering wheel. A steering device for a children's vehicle, characterized in that the steering device is mounted on a bearing member that is made of metal.