JPS6220760Y2 - - 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 formed 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. is arranged so that the initial load of the suspension spring 5 is adjusted as the spring guides 3 and 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, 7, and it is difficult to rotate the spring guides 3, 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. This could lead to malfunction or deterioration of quality.

In contrast, the present applicant has developed an initial suspension spring in a hydraulic shock absorber suitable for use in a motorcycle rear suspension unit, which allows the spring load to be easily adjusted from the outside even in a narrow space and without causing damage to the equipment. We provide setting load adjustment devices.

First, this initial setting load adjusting device will be described.

In FIG. 2, the hydraulic shock absorber A is cylinder 8.
A piston rod 9 is slidably inserted into the cylinder 8, and a bracket 10 is provided at one end of the cylinder 8.
The piston rod 9 protrudes from the cylinder 8 to the left in the figure and has a bracket 11 fixed to its end.

A mounting member 12 is screwed onto the piston rod 9 on the right side of the bracket 11, an annular groove is formed on the outer periphery of the mounting member 12, and a flat support plate 13 is fitted into the annular groove. This support plate 1
A spring guide 14 is removably fitted into the spring guide 3.

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 in the axial direction.

A spring bearing member 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 the spring bearing member 16 and the spring guide 14 on the piston rod side. is energized in the direction of elongation.

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, 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 receiving member 16 due to the reaction force 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, teeth provided on the outer periphery of the worm body 27 mesh with gear teeth 23 of the worm gear 19, and an operation hole 29 made of a hexagonal hole is formed at the front end of the worm body 27. There is. This operation hole 29 may be a normal screw groove or a hole of other shape.

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.

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 worm gear 19 rotates clockwise via the gear teeth 23, and this worm gear 19
Move to the left while rotating through. Therefore, the worm gear 19 moves to the left by an amount corresponding to the amount of rotation of the worm 26, and at this time, the spring receiving member 16 that is in contact with the left end of the worm gear 19 resists the suspension spring 17, and moves by the same amount as the amount of movement of the worm gear 19. moves to the left, thereby further compressing the suspension spring 17,
The initial load is set according to the operation amount of the worm 26, or in other words, the position of the worm gear 19.

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 such a conventional example, the worm 26 and the worm gear 19 are perpendicular to each other, and the operation hole 29 is provided on the front side of the worm 26. Therefore, even in a narrow space, a handle-like tool can be inserted and the worm 2 can be easily operated.
6 can be rotated, and the worm gear 19 and spring bearing member 16 hidden behind the vehicle body can also be moved in the axial direction.

However, in such an initial setting load adjustment device for the suspension spring 17, the worm 26 is attached to the housing 2.
0, when the worm 26 rotates and the worm gear 19 moves, the worm 2
Sliding resistance in the axial direction occurs between the worm gear 6 and the worm gear 19, and therefore it is necessary to increase the rotational operating force of the worm 26. Furthermore, worm gear 1
9 has problems such as requiring an axial length for adjusting the deflection of the suspension spring 17.

In order to solve the above problems, the present invention disposes the worm on the spring bearing member that supports the suspension spring, thereby eliminating the axial sliding resistance between the worm and the worm gear and shortening the axial length of the worm gear. To provide an initial setting load adjustment device for a suspension spring in a hydraulic shock absorber.

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

3 and 4 are a front sectional view and a side sectional view of essential parts showing one embodiment of the initial setting load adjusting device according to the present invention, and the same components as shown in FIG. 2 have the same reference numerals. is attached. In FIGS. 3 and 4, reference numeral 30 denotes a cylindrical guide member fitted into the outer periphery of the end of the cylinder 8 in the direction of the bracket 10. A guide groove 30a is formed on a part of the outer periphery of the cylinder 8 in the direction of the piston rod 9. It is formed in the axial direction by approximately the deflection adjustment amount. Further, a stopper 31 is provided protruding from the outer periphery of the guide member 30 on the side where the guide groove 30a is not provided. This stopper 31 can be formed integrally with the guide member 30 or can be provided by caulking a separate member.
Reference numeral 32 denotes a bottomed cylindrical spring bearing member disposed on the outer periphery of the guide member 30 so as to be movable in the axial direction, and a tongue piece 32a protruding from a part of the center hole of this member slides into the guide groove 30a. The spring bearing member 32 is movably fitted in the guide member 30 so that the spring bearing member 32 cannot be rotated around the guide member 30 and can only be moved in the axial direction.
Reference numeral 33 denotes a ring-shaped worm gear interposed between the stopper 31 and the spring receiving member 32 so that both end surfaces are in contact with them, and the inner peripheral surface of the worm gear is in rotatable sliding contact with the outer periphery of the guide member 30. There is.

On the other hand, the worm gear 33 has the worm 2
6 are in mesh with each other, and this worm 26 is integrally connected to an adjuster rod 34 rotatably supported by a spring receiving member 32. Further, the surface of the worm gear 33 that comes into contact with the stopper 31 serves as a cam surface 35 serving as a spring receiving member feeding portion.

Next, we will discuss the operation.

First, when compressing the suspension spring 17, the adjuster rod 34 is rotated in one direction manually or manually using a tool. This rotation is transmitted to the worm gear 33 via the worm 26, and the worm gear 33 rotates in one direction. Therefore, the cam surface 35 of the worm gear 33 is connected to the suspension spring 17.
The worm gear 33 is guided along the stopper 31 while receiving a reaction force, and the worm gear 33 moves to the left in the axial direction.
By moving the worm gear 33 to the left, the spring receiving member 3
2 also moves to the left, and the suspension spring 17 is compressed. on the other hand,
If it is desired to extend the suspension spring 17, the adjuster rod 34 may be rotated in the opposite direction.

In this way, the initial setting load of the suspension spring is adjusted.

FIG. 5 shows another embodiment of the suspension spring initial setting load adjusting device. The guide member 30A is made of a thick material, and a screw 36 is provided on the outer periphery of the guide member 30A to engage with a screw serving as a spring receiving member feeding portion provided on the inner periphery of the worm gear 33A. A guide groove 30a is provided to guide the piece 32a. Further, the above-described stopper 31 and cam surface 35 have been removed.

In this device, when the adjuster star rod 34 is rotated, the rotation is transmitted to the worm gear 33A via the worm 26, and the worm gear 33A itself is fed along the screw 36 that meshes with the worm gear 33A, and the spring bearing member 32 is rotated around the shaft. Move in direction.
In this way, the initial setting load of the suspension spring 17 that is engaged with the spring receiving member 32 is adjusted.

In this way, the worm 26 is supported by the spring bearing member, and the worm 26 and the worm gears 33, 33A are connected to each other.
The worm gear 33,
By shortening the axial length of 33A, the configuration can be made smaller and more compact.

As described above, the configuration of the present invention includes a guide member provided on the outer periphery of the cylinder, a spring bearing member movable in the axial direction on the outer periphery of the guide member, and a feeding portion for the spring bearing member movable in the axial and rotational directions. A guide groove is formed in the guide member in the axial direction, a tongue provided on the spring bearing member is slidably fitted into the guide groove, and the worm gear is arranged in a direction perpendicular to the guide groove. The worm is engaged with a provided worm, and one end is brought into contact with the spring receiving member, so that the worm is rotatably supported by the spring receiving member.

As a result, in the present invention, the initial setting load of the suspension spring can be easily adjusted, the configuration can be made compact, the axial sliding resistance between the worm and the worm gear can be eliminated, and the axial length of the worm gear can be reduced. It can be shortened and the spring receiving member can be guided in the axial direction without rotating.

[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 sectional view showing an improved conventional hydraulic shock absorber, and Figures 3 and 4 are front sectional views of essential parts showing an embodiment of the suspension spring initial setting load adjustment device according to the present invention. A side sectional view, and FIG. 5 is a front sectional view of main parts showing another embodiment. 8...Cylinder, 9...Piston rod, 17
...Suspension spring, 26... Worm, 32... Spring receiving member, 33, 33A... Worm gear, 35...
...cam face.

Claims (1)

[Claims for Utility Model Registration] (1) A piston rod is inserted into and out of the cylinder, a spring bearing member is fitted to the outer periphery of the cylinder so as to be movable in the axial direction, and a part of the piston rod and the spring bearing member are fitted to the outer periphery of the cylinder. In a hydraulic shock absorber in which a suspension spring is interposed between the cylinders, a guide member is provided on the outer periphery of the cylinder, a spring bearing member movable in the axial direction is provided on the outer periphery of the guide member, and a spring bearing member is movable in the axial and rotational directions. A worm gear having a feeding portion is provided, a guide groove is formed in the guide member in the axial direction, a tongue piece provided on the spring receiving member is slidably fitted into the guide groove, and the worm gear is fitted into the guide groove. Initial setting load adjustment of a suspension spring in a hydraulic shock absorber in which the worm is engaged with a worm disposed in a perpendicular direction, one end is brought into contact with the spring receiving member, and the worm is rotatably supported by the spring receiving member. Device. (2) The initial setting load adjustment device for a suspension spring in a hydraulic shock absorber according to claim 1, wherein the feeding portion provided on the worm gear is a cam. (3) The initial setting load adjustment device for a suspension spring in a hydraulic shock absorber according to claim 1, wherein the feed portion provided on the worm gear is a screw that is screwed into a thread on the outer periphery of the guide member.