JPH024875Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a steering device for a vehicle, and particularly to a vehicle having a single steering wheel such as a motorcycle.

A single steering wheel of a vehicle such as a motorcycle is arranged on the center line of the width of the vehicle, which is the direction of travel of the vehicle, because it is necessary to equalize left and right turning performance.

For this reason, the front wheel holding structure of this type of vehicle is such that the steering shaft is inserted and held through a steering shaft tube provided on the center line of the vehicle body, and two The front forks are supported in a symmetrical position with respect to the steering axis, and the front wheels are held at the center of the lower ends of these front forks, so that the front wheels are positioned on the center line.

By the way, even if a steering device is constructed with such consideration in mind, various devices are added to the steering device before it is used as a complete vehicle. In reality, in this type of vehicle, no special consideration is given to the effects of adding such various devices (such devices are referred to as additional devices in this specification).

As a result of intensive study of the current situation, the inventor came to the conclusion that the installation of these additional devices hinders the improvement of the steering operability of this type of vehicle.

This invention was developed under these circumstances, and is an attempt to improve the steering operability of this type of steering device.

In order to achieve this purpose, this invention makes the distances of the two front forks placed on both sides of the steering wheel to the steering center unequal, and the mass of the attached additional device is larger. The distance from the front fork on the other side is greater than the distance from the front fork.

An embodiment of the motorcycle shown in the drawings will be described below.

1 is the vehicle body, 2 is the steering shaft tube, and 3, 3R, and 3L are the front forks. front fork 3,3
R and 3L are connected to each other at the upper and lower positions of the steering shaft tube 2 by an upper bracket 4 and a lower bracket 5. Although not shown, a steering shaft connecting the upper bracket 4 and the lower bracket 5 is provided inside the steering shaft tube 2 so that the front wheels 6 can be steered.

7 is a disc brake device, which corresponds to an additional device in this invention. And this is front wheel 6
It consists of a disc 8 mounted on one side displaced from the center line of the vehicle (line C-C in Figure 2) and a caliper 9 held on the front fork 3, and therefore held on the steering shaft tube. The symmetry of the mass of the steering system as a whole with respect to the center line is disrupted. On the other hand, front fork 3, 3R, 3
L is arranged as shown in FIG.

That is, with respect to the center line C-C, the brake device including the disc 8 is provided in the lower part of the figure.
The front fork 3R on this side is provided at a distance a from the center line CC. The front fork 3L on the other side is provided at a distance b from the center line CC.

Here, the relationship a<b holds between these distances a and b. Therefore, the length of the arm on the lighter mass side is longer than the other arm, so that a compensating component is generated in the moment of inertia around the steering axis M on the center line CC.

As a result, the steering operability of the steering device can be improved.

In the embodiment described above, the disk brake device 7 is used as an additional device that impairs the symmetry of the mass around the steering axis M. However, this invention is not limited to this, and the invention is not limited to this. The same applies to cylinders for cars and other parts and devices that are installed on completed vehicles.

As explained above, the mass of the device added to the steering system of this type of vehicle is unequal on the left and right sides of the center line. If the mass is not equal,
The distance of the front fork on the side with less mass to the steering axis is made larger than that on the side of the front fork on the side with more mass to generate a component that offsets the moment of inertia.

Therefore, this offsetting component of the moment of inertia reduces the difference between the left and right moments of inertia, thereby improving steering operability.

[Brief explanation of the drawing]

The drawings relate to an embodiment of the invention; FIG. 1 is a front side view of the motorcycle, and FIG. 2 is an explanatory diagram of the front wheel portion thereof viewed from above. 1: Vehicle body, 2: Steering shaft tube, 3, 3R, 3L: Front fork, 6: Wheel, C-C: Center line in the direction of vehicle movement, M: Steering shaft center.

Claims (1)

[Scope of Claim for Utility Model Registration] A single wheel is provided as a steering wheel, this wheel is arranged on the center line in the traveling direction of the vehicle, and front forks are provided on both sides of this wheel to support the axle of this wheel, A steering device is provided in which the steering wheel is held swingably in the left and right direction via the front fork around the steering shaft tube provided on the center line, and is attached to at least one side of the steering device. In a vehicle steering system in which the device is installed and the mass on both sides with respect to the center line is different, among the front forks on both sides, the front fork on the side with the mass of the additional device has more mass than the front fork on the side with the mass of the additional device. A vehicle steering device consisting of a front fork with a large distance to the steering axis.