JPS6230589Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a damper device for a shock absorber suitable for, for example, a motorcycle.

Generally, automobiles, motorcycles, etc. are equipped with a shock absorber to absorb the impact of the wheels, and a damper device is usually attached to the shock absorber to encourage the convergence of spring waves after absorbing the shock. do. Most of these damper devices are called oil dampers, and are designed to achieve the above-mentioned purpose by sealing oil in a cylinder and changing the flow resistance of the oil in the direction of action and the direction of extension of the cushion. It is something that exists. However, due to the nature of relatively small and simple motorcycles, there is a tendency in the design to omit this type of complicated oil damper. However, even in this type of simple motorcycle, it is possible to obtain even better damping characteristics if the damper action itself can be obtained, and there has been a demand for the development of such a damper.

The present invention was made in response to such demands, and it is an object of the present invention to propose a damper device that is particularly suitable for use as a relatively simple shock absorber for motorcycles of this type. The feature is that in a device in which a shock absorber is interposed between a cylindrical body and a sliding rod that are loosely fitted inside and outside with almost the same axis position, a sliding contact piece inscribed in the cylindrical body is attached to the sliding rod. Attachment: This sliding contact piece has a tapered shape around the entire circumference within the axial thickness range of the sliding rod on the side in the direction of shock absorbing action, thereby allowing quick movement in the direction in which the cushion operates. At the same time, the friction resistance is relatively increased upon return, and the repeated action of the buffer body made of a coil spring or the like is made to converge more quickly.

The present invention will be explained in detail below based on the illustrated embodiments. FIG. 1 shows an example of a motorcycle M to which the present invention is applied, and the front fork of the motorcycle M to which the present invention is applied will be described in detail below. Of course, the present invention is not limited to this type of motorcycle, and may be applied to even larger models of motorcycles, or may be used in parallel with a motorcycle equipped with an oil damper. . Further, in the embodiment, the case where the present invention is used in a front wheel shock absorbing device has been described, but it may of course be incorporated into a rear wheel shock absorbing device unit. Further, the present invention is not limited to use in vehicles, but can also be applied to various industrial shock absorbers. First, code 1
This is the front fork of the motorcycle M, which is of the so-called bottom link type.
It goes without saying that the present invention can be applied not only to a bottom link type shock absorber but also to a telescope type shock absorber, a trailing link, or an Earl's type cushion device.
For example, this front fork 1 is formed by bending a fork pipe 2 into an arch shape so that it can be placed on both sides of the front wheel 3. A holder arm 4 is provided behind the lower end of the fork pipe 2, and a pivot at the lower end of the holder arm 4 is provided. A pivot arm 6 is rotatably attached to the shaft 5, and a cushion rod 7, which is a sliding rod, is rotatably attached to the tip of the pivot arm 6. The upper end of the cushion rod 7 is loosely fitted into a spring case 8, which is a cylindrical body formed by using the lower part of the hawk pipe 2. Regarding the internal structure of this part, a partition piece 9 is provided above the spring case 8, and a coil spring 10 serving as a buffer is housed below the partition piece 9. The lower end of this coil spring 10 is configured to abut against the upper end of the cushion rod 7, which is the sliding rod, via a retainer 11. Reference numeral 12 is an upper stopper rubber provided inside the coil spring 10, and 13 is a lower stopper rubber for absorbing the shock when the cushion is fully extended.

A sliding contact piece 1 is attached to the upper end of the cushion rod 7.
Fix 4. This sliding contact piece 14 is made of an elastic material such as rubber or synthetic resin, has a substantially disk shape, and is fixed to the cushion rod 7 by a holding piece 15. In this embodiment, since the absorbing operation direction of the cushion is upward, the shape of the outer peripheral part is such that the cushion rod 7 has an entire circumference on the absorption operation direction side, that is, above the sliding contact piece 14 within the axial thickness range of the cushion rod 7. A tapered surface 16 is formed over the entire length.

In such a structure, when the motorcycle receives a shock and acts as a buffer, the cushion rod 7 first moves upward, and this movement is absorbed by the deformation of the coil spring 10, which serves as a shock absorber. After absorbing the shock, the cushion rod 7 is moved again by the return action of the coil spring 10.
It pushes down. At this time, in the present invention, the sliding contact piece 14 fixed to the cushion rod 7 is sliding against the inner circumferential surface of the cylindrical spring case 8, and a tapered surface 16 is formed on the upper side. As shown in FIG. 2, the sliding contact piece 14 easily points its tip downward when the cushion is acting, and smoothly slides inside the spring case 8 and moves upward, enabling quick contraction of the coil spring 10. be.

When the coil spring 10 returns to its extended state, since the tapered surface of the sliding contact piece 14 is not formed in the return direction, its tip edge (rip part) curls up and becomes a cylinder, as shown in FIG. It acts as if it bites into the inner peripheral surface of the body, increasing its frictional resistance. Therefore, when the cushion expands, its movement is extremely slow, and the energy of the coil spring 10 contracted during shock absorption is released slowly.

As described above, according to the present invention, a shock absorber having an excellent damping effect can be obtained with an extremely simple structure, and has excellent practical effects. In addition, in the embodiment of the present invention, an example in which one sliding contact piece was provided was shown, but it may be formed by laminating two or more pieces in order to obtain a stronger damping effect. Alternatively, the same effect may be obtained by forming grooves with a sawtooth cross section on the outer peripheral surface of a single cylindrical block.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a motorcycle to which the present invention is applied, Fig. 2 is a partially cutaway front view of a shock absorber equipped with the damper device of the present invention, and Fig. 3 is a state in which the cushion rod is raised. FIG. 4 is a cross-sectional front view showing the sliding contact piece in a state where the cushion rod is lowered. 1 is the front fork, 2 is the hawk pipe, 7 is the cushion rod, 8 is the spring case, 10
1 is a coil spring, 14 is a sliding contact piece, and 16 is a tapered surface.

Claims (1)

[Scope of utility model registration request] In a device in which a buffer is interposed between a cylindrical body and a sliding rod that are loosely fitted inside and outside with almost the same axis center position, a sliding contact piece inscribed in the cylindrical body is attached to the sliding rod, and this sliding 1. A damper device for a shock absorber, characterized in that the contact piece is formed in a tapered shape over the entire circumference within the axial thickness range of the sliding rod on the side in the direction of shock absorbing action.