JPS633482Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spring load adjustment mechanism for a hydraulic shock absorber that adjusts the initial load of a coil spring fitted around the outer periphery of a cylinder.

This type of mechanism has an adjuster that receives one end of a coil spring on one end surface and has a wavy cam surface on the other end surface and is rotatably and slidably fitted, and the wavy cam surface of the adjuster and the outer periphery of the cylinder are fitted together. A type is known in which the adjuster is slid in the axial direction relative to the cylinder by changing the engagement position with a stopper protruding from the cylinder, thereby adjusting the set length of the coil spring.

However, such a mechanism requires a great deal of effort to drive, and furthermore, there are disadvantages in that adjustments cannot be made steplessly and continuously. In addition, when adjusting, a work space is required to engage tools and the like to rotate the adjuster, and this is especially true for the rear wheel suspension system of a two-wheeled vehicle, which is located under the seat and supports the rear body of the vehicle. However, there was also the problem that this type of mechanism was impractical.

The present invention was made to solve such problems, and its purpose is to fix a cylindrical member having a threaded portion on the outer periphery of a cylinder, and further attach a case member to the outer periphery of the cylindrical member. a rotatable shaft that is fixedly fixed, passes through the case member, and has its tip supported by the cylindrical member; and a pinion gear that is installed between the case member and the cylindrical member and rotates together with the rotary shaft. one end surface of the threaded portion of the cylindrical member is screwed to an adjuster; the adjuster has a face gear that meshes with the pinion gear; the adjuster rotates integrally with the adjuster in the circumferential direction; To provide a spring load adjustment mechanism for a hydraulic shock absorber that allows reliable and easy adjustment operation and does not require a working space by engaging an adjustment gear that allows sliding.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a half-cut sectional view of a hydraulic shock absorber having an adjustment mechanism according to the present invention, and FIG. 2 is an exploded perspective view of the adjustment mechanism.

In FIG. 1, 1 is a cylinder. Inside the cylinder 1, a piston rod 2 faces from below. At the upper end of the piston rod 2, a piston 3 is fitted onto the inner periphery of the cylinder 1 so as to be slidable up and down. Fixed. A plurality of oil holes 3a are formed in the piston 3, and a valve mechanism 5 for opening and closing these oil holes 3a is provided on the lower end surface of the piston 3.

An upper bracket 6 is fixed to the upper end of the cylinder 1, and a rod guide 8 consisting of an oil seal 7 fitted on the outer periphery of the piston rod 2 is fixed to the lower inside of the cylinder 1. is the plate 9 screwed onto the inner circumference of this
It is blocked by.

The inside of the cylinder 1 is divided by the piston 3 into an upper working chamber S ₁ and a lower working chamber S ₂ , and hydraulic oil is sealed in both working chambers S ₁ and S ₂ .

An under bracket 10 is fixed to the lower end of the piston rod 2, as shown, and a spring receiver 11 is fixed to the upper edge of the under bracket 10. A stop lever 12 is provided on the upper surface side of the under bracket 10.

By the way, on the upper outer periphery of the cylinder 1, there is a second
As shown in detail in the figure, a cylindrical member 13 having a circular hole 13a on its side and a threaded portion 13b provided on the lower outer periphery of the circular hole 13a is fixed. A case member 14 is further fixed to the outer periphery of this cylindrical member 13, and a rotary shaft 15 is rotatably inserted through the side of the case member 14, and the rotary shaft 15 protrudes outside the case member 14. An adjustment dial 16 is fastened to one end of the shaft by a nut 17 so as to rotate together, and the other end of the rotating shaft 15 is rotatably fitted into a circular hole 13a provided in the cylindrical member 13. There is. Note that a ball 19 that is urged toward the dial 16 by a spring 18 embedded in the groove 14a provided in the case member 14 abuts and engages with the groove 16a provided on the back surface of the adjustment dial 16. This gives a click feeling to the rotation of the dial 16.

Further, the rotating shaft 1 facing the inside of the cylindrical member 13
As shown in the figure, a pinion gear 20 is fitted into the ring 5 so as to rotate together with the ring, and further, below the pinion gear 20 inside the cylindrical member 13, a face gear 21a that meshes with the pinion gear 20 is provided on the upper end surface of the ring. A shaped adjustment gear 21 is positioned by a stopper ring 22 and installed inside. A cylindrical adjuster 23 having a flange portion 23a on the lower end surface is spline-fitted to the inner circumferential side of the adjuster gear 21. Therefore, the adjuster 23 is connected to the adjuster gear 23 in the circumferential direction.
1 and slides up and down in the axial direction. Furthermore, the inner periphery of this adjuster 23 is connected to a threaded portion 13b provided on the outer periphery of the cylindrical member 13.
The adjuster 23 is configured to move up and down as the adjuster 23 rotates. Further, as shown in the figure, a spring receiver 24 that fits vertically and slidably on the outer periphery of the cylinder 1 is in contact with the lower surface of the flange portion 23a of the adjuster 23.
4 is fitted with a dust cover 25 so as to cover the adjuster 23, adjuster gear 21, etc. from the outside.
A coil spring 2 is installed between the spring receivers 11 and 24 as shown in the figure.
6 is hung.

Next, the operation of the adjustment mechanism explained above will be described.

When the rotating shaft 15 is rotated using the adjusting dial 16 from the state where the adjuster 23 is located at its upper limit as shown in FIG. 1, the pinion gear 21 is rotated. As the adjuster gear 21 rotates, the adjuster 23 rotates together with the adjuster 23, and since its inner peripheral portion is screwed into the threaded portion 13b of the cylindrical member 13, the adjuster 23 gradually moves downward from its current position.

Due to the downward movement of this adjuster 23, the spring receiver 24
The spring supports 11 and 24 also move downward, thereby shortening the distance between the spring supports 11 and 24, and the set length of the coil spring 26 stretched between the spring supports 11 and 24. As a result, the length of the coil spring 26 is reduced. The load is adjusted higher.

Next, when the rotary shaft 15 is rotated in the opposite direction using the dial 16, the adjuster 23 moves upward, contrary to the above, and as a result, the load on the coil spring 26 is adjusted to be low.

In the above, the spring load can be adjusted by simply turning the dial 16 located at a fixed position relative to the cylinder 1, so the work is easy.
The adjustment mechanism does not require much work space, and the adjustment mechanism includes a case member 14 fixed to the cylinder 1, a pinion gear 20 rotatably supported by the cylindrical member 13, and a face gear 21 that meshes with the pinion gear 20.
By adopting a gear mechanism consisting of a and a, not only is the adjustment operation reliable, but it also promotes torque amplification, and in fact, the work can be easily performed with only a small amount of effort.

Furthermore, if the rotating shaft 15 is extended to a location where it can be easily operated via a wire cable or the like, adjustment work can be performed by remote control.

According to the present invention, the above effects can be obtained.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a half-cut sectional view of a hydraulic shock absorber having an adjustment mechanism according to the invention, and FIG. 2 is an exploded perspective view of the adjustment mechanism. In the drawing, 1 is a cylinder, 11 and 24 are spring bearings, 13 is a cylindrical member, 14 is a case member, 15 is a rotating shaft, 16 is an adjustment dial, 20 is a pinion gear, 21 is an adjustment gear, 21a is a face gear, 23 is an adjuster, and 26 is a coil spring.

Claims (1)

[Scope of utility model registration request] In a spring load adjustment mechanism for a hydraulic shock absorber, one end of a coil spring provided on the outer periphery of the cylinder is supported by an adjuster, and the load of the coil spring is adjusted by displacing the adjuster. A cylindrical member having a threaded portion is fixed to the cylindrical member, a case member is fixed to the outer periphery of the cylindrical member, and a rotatable rotating shaft is inserted through the case member and whose tip is supported by the cylindrical member;
A pinion gear is provided between the case member and the cylindrical member and rotates integrally with the rotating shaft,
A threaded portion on the outer periphery of the cylindrical member is screwed into the adjuster, and the adjuster is provided with a face gear that meshes with the pinion gear, and rotates integrally with the adjuster in the circumferential direction to prevent the adjuster from sliding in the axial direction. A spring load adjustment mechanism for a hydraulic shock absorber, characterized in that a permissible adjustment gear is engaged.