JPS6126655Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an initial setting load adjusting device for a suspension spring in a hydraulic shock absorber.

For example, a hydraulic shock absorber used as a conventional rear suspension unit for two-wheeled vehicles has a suspension spring interposed between the piston rod and the cylinder. Generally, the initial setting load is adjusted according to the weight of the cargo.

For example, the device shown in FIG. 1 is known as an initial setting load adjusting device for this suspension spring.

A screw 2 is cut on the outer periphery of the cylinder 1, and spring guides 3 and 4 are screwed into the screw 2 so as to be movable in the axial direction. 5, the initial load of the suspension spring 5 is adjusted as the spring guides 3, 4 move in the axial direction.

To move the spring guides 3, 4, gear-shaped grooves 6, 7 are provided on the flanges of the spring guides 3, 4, and a tool is inserted into these grooves 6, 7 to rotate the spring guides 3, 4. ，
The suspension spring 5 expands and contracts depending on the position of 4, and its initial load is set.

On the other hand, in recent years, rear suspension units for motorcycles and the like have been put into practical use in a vehicle body structure in which the conventional two units are placed on each side of the left and right sides of the vehicle body, but the burden is replaced by a single unit. For this reason, in response to this structure, the rear compression unit has also come to be located in the middle of the car body frame, so the spring guides 3 and 4 are hidden behind the car body frame, and this body frame becomes an obstruction to the outside. It is difficult to insert a tool into the grooves 6 and 7, and it is difficult to rotate the spring guides 3 and 4. For this reason, conventionally, a long rod is inserted into the grooves 6, 7 of the spring guides 3, 4, and the long rod is hit strongly with a hammer or the like to rotate the spring guides 3, 4.

Therefore, since the rotation operation of the spring guides 3 and 4 is troublesome, the workability of the initial adjustment of the suspension spring is poor, and the spring guides 3 and 4 may be damaged when struck with a hammer, or the unit or vehicle body may be deformed due to vibration. There was a risk that this could lead to malfunction or deterioration of the product.

Therefore, the purpose of this invention is to
To provide an initial setting load adjustment device for a suspension spring in a hydraulic shock absorber suitable for use in a rear suspension unit of a motorcycle, which allows the spring load to be easily adjusted from the outside and prevents damage to equipment.

For this purpose, the present invention has one end of the worm gear in contact with one end of the spring guide, and the worm gear meshes with the worm in the direction perpendicular to this, so that when the worm is rotated from the outside laterally, the worm gear and the spring guide move in the axial direction. The present invention is characterized in that the initial load of the suspension spring that is displaced to abut the other end of the spring guide is set in accordance with the positions of the worm gear and the spring guide.

Embodiments of the present invention will be described below with reference to the drawings.

In the hydraulic shock absorber A, a piston rod 9 is slidably inserted into a cylinder 8, and a bracket 10 is provided at one end of the cylinder 8.
protrudes to the left from the cylinder 8, and a bracket 11 is fixed to its end.

A mounting member 12 is screwed onto the piston rod 9 on the right side of the bracket 11, and an annular groove is formed on the outer periphery of the mounting member 12. A horizontal support plate 13 is fitted into this annular groove. Plate body 13
A spring guide 14 is removably fitted therein.

A cushion rubber 15 is fixed to the outer periphery of the piston rod 9 on the right side of the mounting member 12, and the spring guide 14 is inserted into the outer periphery of the cushion rubber 15 so as to be movable left and right.

A spring guide 16 is inserted into the outer periphery of the cylinder 8 so as to be freely movable in the axial direction, and a suspension spring 17 is interposed between this spring guide 16 and the spring guide 14 on the piston rod side, and this spring 17 always extends the piston rod 9. It's pushing in the direction.

A screw 18 is carved on the outer periphery of the cylinder 8, and a cylindrical worm gear 19 is formed on the outer periphery of the screw 18.
The housing 20 and the inner periphery of a cylindrical holding member 21 are screwed together so as to be movable in the axial direction.

The worm gear 19 has a screw 22 formed on its inner periphery, and gear teeth 23 formed on its outer periphery in the circumferential direction, and the left end of the worm gear 19 is always in contact with the right end of the spring guide 16 due to the tension of the spring 17.

The housing 20 is provided with a worm case 25 at the upper left end of a cylindrical main body 24, a worm gear 19 is movably inserted into the main body 24, and a worm 26 is rotatably inserted into the worm case 25. The worm 26 is perpendicular to the worm gear 19 and has teeth 28 provided on the outer periphery of the worm body 27.
meshes with the gear teeth 23 of the worm gear 19, and an operating hole 29 made of a hexagonal hole is formed at the front end of the worm body 27. The operating hole 29 can be a normal threaded groove or a multi-shaped hole.

The holding member 21 is screwed to the outer periphery of the cylinder 8 to prevent the housing 20 from moving to the right and coming off the cylinder 8, and the positions of the housing 20 and the holding member 21 are such that the hydraulic shock absorber A is installed on a motorcycle or the like. The time is set in advance, but it can be changed even after it is installed on the vehicle body, if necessary.

A flange 30 is formed on the front side of the worm 26, and this flange 30 abuts against a snap spring or other similar stopper 31 provided at the end of the case 25 to prevent the worm 26 from slipping out of the case 25.

Next, we will discuss the operation.

To further compress the suspension spring 17 from the position shown in FIG. Then, the worm 26 moves in conjunction with the tool.
rotate in the same direction.

When the worm 26 rotates clockwise, the teeth 28
Worm gear 19 via gear teeth 23 meshing with
rotates clockwise, and this worm gear 19
moves to the left while rotating via the screw 22 on the inner periphery. For this reason, worm gear 19 is worm 2
The spring guide 1 moves to the left according to the amount of rotation of the worm gear 19, and is in contact with the left end of the worm gear 19 at this time.
6 moves to the left against the suspension spring 17 and moves to the left by a stroke equal to the amount of movement of the worm gear 19, which further compresses the suspension spring 17 and changes the amount of operation of the worm 26, in other words, according to the position of the worm gear 19. Initial load is set.

Conversely, if it is desired to extend the suspension spring 17 from the position shown in FIG. 2, the worm 26 may be rotated in the opposite direction.

In this embodiment, the worm 26 and the worm gear 1
9 are perpendicular to each other, and an operation hole 2 is provided on the front side of the worm 26.
9 is provided, so you can easily insert the handle-shaped tool and warm it even in a narrow space.
can be rotated, and the worm gear 19 and spring guide 16 hidden behind the vehicle body can also be moved in the axial direction.

As described above, the present invention adjusts the initial load of the suspension spring via the worm and worm gear, so even if the worm gear, spring guide, etc. are located in a position where they are obstructed by the rear frame of a motorcycle, etc., it will save space. Even when restricted,
A tool can be inserted into the operation hole of the worm from the outside on the front side, and adjustment operations can be performed simply by rotating the tool, which significantly improves the operability. Further, since the adjusting member is not struck from the outside, the adjusting member is not damaged, and there is no risk of rattling or malfunction.

[Brief explanation of the drawing]

Figure 1 is a schematic longitudinal sectional front view of a hydraulic shock absorber using a conventional suspension spring initial setting load adjustment device;
The figure is a partially cutaway longitudinal sectional front view of a hydraulic shock absorber using the suspension spring initial setting load adjusting device of the present invention, and FIG. 3 is a cross-sectional side view taken along the line -- in FIG. 8...Cylinder, 9...Piston rod, 14
... Spring guide, 16 ... Spring guide, 17 ... Suspension spring, 18 ... Screw, 19 ...
Worm gear, 20...housing, 25...housing case, 26...worm, 29...operation hole.

Claims (1)

[Claims for Utility Model Registration] (1) A piston rod is slidably inserted into a cylinder, a spring guide is movably inserted into the outer circumference of the cylinder, and a suspension spring is inserted between the spring guide at the end of the piston rod and the spring guide. In the interposed hydraulic shock absorber, a screw is carved on the outer periphery of the cylinder, and a worm gear is interposed on the outer periphery of the cylinder via the screw so as to be movable in the axial and rotational directions. An initial setting load adjustment device for a suspension spring in a hydraulic shock absorber in which the worm gear is meshed with the spring guide and one end of the worm gear is always in contact with the spring guide. (2) An initial setting load adjustment device for a suspension spring in a hydraulic shock absorber according to claim 1, wherein a worm is rotatably provided in a housing case provided on the outer periphery of a cylinder. (3) An initial setting load adjustment device for a suspension spring in a hydraulic shock absorber according to claim 1 of the utility model registration claim, wherein an operating hole is formed at one end of the worm, and a tool is inserted into the operating hole and rotated. .