JPS6238874Y2 - - 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, as a method for adjusting the spring load of this type of conventional rear suspension unit for motorcycles, etc.,
As shown in Publication No. 594, an outer cylinder is extendably arranged around the outer circumference of the cylinder, a spring is interposed between a spring guide of this outer cylinder and a spring receiver on the piston rod side, and a plurality of outer cylinders are arranged at the upper end of the outer cylinder. The cam is formed into a step-like shape, a jig is inserted into the boss of the outer cylinder, the outer cylinder is rotated against the spring, and the stopper on the cylinder side is fitted to an arbitrary cam to adjust the height of this cam. It is known that the spring load is set depending on the situation.

In other words, rear suspensions for two-wheeled vehicles are designed to determine the fitting position of the cam and stopper depending on whether the bike is for one rider or two riders, or depending on the weight of the rider, and to set the spring load depending on the rider. .

Devices using such cams have been widely put into practical use, but in recent years, rear wheel hydraulic shock absorbers used on motorcycles have replaced the conventional rear wheel shock absorbers, which were installed on both the left and right sides of the vehicle body, with hydraulic shock absorbers. Vehicle body structures have been put into practical use that allow the burden to be borne by a single device. For this reason, the spring constant of the suspension spring mounted on the hydraulic shock absorber has become large, and its initial load has also been set larger than that of conventional shock absorbers. On the other hand, when adjusting the initial setting load, the operating force becomes large and a considerable amount of force is required, resulting in poor workability.Also, due to the structure of the car body, if you try to rotate the cam with a screwdriver, etc., the car body etc. will get in the way. Problems such as this have occurred.

Therefore, as a solution to these drawbacks, the tension of the spring can be adjusted hydraulically, and the adjustment can also be made while riding the motorcycle, making the adjustment process simple and speedy, and can be done manually. Spring load adjustment devices for rear cushion units for motorcycles that do not require force have also been developed.

This hydraulic adjustment device guides hydraulic pressure from a pump to a hydraulic cylinder constructed around the outer circumference of the hydraulic shock absorber.
This oil pressure sets the hydraulic cylinder at a certain position and adjusts the spring load. However, with this hydraulic type, the spring load acts on the hydraulic circuit constantly while the motorcycle is running, which can cause oil leaks and reduce the initial set load of the suspension springs, making it unreliable. be.

Therefore, the purpose of the present invention is to solve the above-mentioned conventional drawbacks by creating a system that requires little operating force, has good adjustment workability, is free from oil leaks, and is highly reliable, and is suitable for use in motorcycle rear suspension units, etc. An object of the present invention is to provide an initial setting load adjusting device for a suspension spring in a hydraulic shock absorber.

In order to achieve this objective, the configuration of the present invention compresses the suspension spring to a predetermined position using liquid or air pressure, and in this state sets the position corresponding to the initial setting load using a positioning member such as a nut. The suspension spring is then mechanically held at the set position by releasing the pressure.

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

FIG. 1 shows a preferred embodiment of the present invention, which includes a hydraulic shock absorber 1 such as a rear suspension unit of a motorcycle, a suspension spring 2, a movable member 3 supporting the suspension spring, and a movable member 3. It consists of an adjusting nut 4 which is a positioning member for setting the position, and a hydraulic pump which supplies hydraulic pressure to the pressure chamber 5 of the movable member 3.

In the hydraulic shock absorber 1, a piston rod 6 is slidably inserted into a cylinder 7 via a piston, and this hydraulic shock absorber 1 has a bracket 8 provided at the outer end of the cylinder 7 and a bracket 9 provided at the outer end of the piston rod 6. It is designed to be interposed between the wheel side of the motorcycle and the vehicle body side.

A cushion 10 and a spring seat 11 are fixed to the upper part of the piston rod 6, and a cylinder 7
A movable member 3 is slidably inserted into the outer periphery of the movable member 3 through a seal 12, and a flange-shaped spring seat 13 provided on the movable member 3 and the piston rod 6
A suspension spring 2 is telescopically interposed between the side spring seats 11, and the suspension spring 2 always urges the piston rod 6 in the direction of extension.

A movable adjustment nut 4 is provided on the outer periphery of the movable member 3.
and a fixed outer cylinder 15 are disposed, and the adjustment nut 4 is screwed onto the outer periphery of the movable member 3 via a screw 14 so as to be movable left and right, and also comes into contact with the end face of the outer cylinder 15 so as to be able to move toward and away from the outer periphery. The base end 15a of the cylinder 15 is held on the cylinder 7 side via a seal 16 and a stopper 17. The outer circumference of the movable member 3 is in sliding contact with the inner circumference of the outer cylinder 15, and a seal 18 is interposed between the inner circumference of the outer cylinder 15 and the outer circumference of the movable culture medium 3. A pressure chamber 5 is defined between the right end of the movable member 3 and the inner side of the base end of the outer cylinder 15, and this pressure chamber 5 is connected to a hydraulic pressure source through a through hole 19 provided in the outer cylinder 15. The outer cylinder 15 is provided with an extension 15b, which is inserted into the interior 20 of the adjustment nut 4 and guides the adjustment nut 4.

Hook parts a and b are provided on the right side of the adjustment nut 4 and the left side of the extension part 15b of the outer cylinder 15, and when the nut 4 and the movable member 3 stroke to the left, the maximum stroke is regulated, and the adjustment nut 4 comes into contact with the left end portion of the extension portion 15b when stroked in the right direction. It is also possible to use a stopper provided on the outer periphery of the cylinder 7 to restrict the stroke range of the movable member 3 and the nut 4. By providing the cover 21 on the left end side of the movable member 3 and moving the cover 21 along the cylinder 7 together with the movable member 3, dust can be prevented from entering the movable member 3. The outer cylinder 15 may be molded integrally with the cylinder 7, or may be configured to introduce air pressure into the pressure chamber 5.

Further, although fluid pressure is applied to the pressure chamber 5 through a passage 19, the position of this passage is not limited to that shown in the drawings.

Next, we will discuss the operation.

As is well known, the hydraulic shock absorber 1 is interposed between the wheel side and the vehicle body side, and damps vibrations from the wheel side while the vehicle is running. Further, when adjusting the initial setting load of the suspension spring according to the weight of the person riding the motorcycle or the like, the weight of the cargo, and the uneven conditions of the road on which the motorcycle is being ridden, the following procedure is performed.

In the state shown in FIG. 1, when pressure oil is supplied from a hydraulic or pneumatic source such as a pump to the pressure chamber 5 through the passage 19, the internal pressure of the pressure chamber 5 increases, and this internal pressure resists the suspension spring 2. The movable member 3 and the adjusting nut are moved to the left, thereby compressing the suspension spring 2 and holding the movable member 3 at a stopper position, for example. At this time, the right end of the adjusting nut 4 is separated from the outer cylinder 15, and only the adjusting nut 4 becomes movable to the right. For this reason, first, the suspension spring 2 and the movable member 3 are held in the compression direction on the left side using the pump's pressure oil, and in this state, for example, only the adjustment nut 4, which is the positioning member, is manually rotated to the right to a predetermined position. Move while moving. That is, the position where the adjustment nut 4 is held by the screw 14 becomes the position where the initial setting load of the suspension spring 2 is set. This setting position is determined by moving the adjustment nut 4 from side to side each time to suit the above-mentioned body weight, luggage weight, and running route conditions.

Once the holding position of the adjustment nut 4 is set,
Operate the pump in the opposite direction to the above to create a low pressure inside the pump, but let the pressure be sucked in. For this reason, pressure chamber 5
pressure oil is discharged into the pump through the passage 19,
Since the pressure chamber 5 becomes low pressure, the movable member 3 and the adjusting nut 4 are pushed by the restoring force of the suspension spring 2 and move to the right. At this time, the adjusting nut 4 contacts the left end surface of the extension part 15b of the outer cylinder 15, and this Movable member 3
The position of is also held corresponding to the holding position of the adjusting nut 4, and the amount of deflection of the suspension spring 2 is also determined, so the initial setting load of the suspension spring 2 is determined corresponding to the holding position of the adjusting nut 4. That will happen.

In the above operation, since the suspension spring 2 is compressed by the pressure oil of the pump, the tension of the suspension spring 2 does not act on the adjustment nut 4, and the operating force of the adjustment nut 4 is small, which improves work efficiency. is good.

Furthermore, once the spring load is set, the suspension spring 2 is mechanically held by the adjustment nut 4, so problems such as oil leakage from the hydraulic circuit due to the spring load do not occur, and the set position of the suspension spring 2 is shifted. It is highly reliable because there is no problem.

FIG. 2 shows another embodiment of the present invention, in which the positioning member is provided with a detent mechanism. That is, a detent mechanism 22 consisting of a ball and a spring is provided in the radial direction of the adjustment nut 4 serving as a positioning member, and an outer cylinder 15
One or more locking grooves 23 are provided on the side of the detent mechanism 22 with which the balls of the detent mechanism 22 selectively engage, and when the position of the adjustment nut 4 is set, the detent mechanism 22
meshes with one of the locking grooves 23 to position the adjusting nut 4 and prevent loosening or rattling.

Regarding FIG. 2, the other configurations, functions, and effects are the same as those in FIG. 1, so their description will be omitted.

As described above, the present invention has the following effects.

Since the positioning member is driven with the spring compressed by fluid pressure or gas pressure, the operating force is small and the operation is easy.

Since the suspension spring is supported by the outer cylinder via a positioning member such as a nut, its retention is mechanical, and no spring load acts on the pressure chamber.
Therefore, there is no risk of oil leakage, etc., and the spring load, once set, does not increase or decrease, making it highly reliable.

When supplying pressure oil, there is no need to attach a special tank, and the structure is compact.

Since the positioning member is movably attached while being guided along the outer circumference of the outer cylinder, the positioning member and the movable member are guided vertically along the axial direction, preventing misalignment of the axes of the movable member and the suspension spring. can.

Since the movable member and the positioning member are provided on the cylinder side, the positioning member can be operated without being obstructed by attached members on the vehicle body side.

The positioning member is screwed into a screw formed on the outer periphery of the movable member, and since no screw is formed in the cylinder, the cylinder is easy to process and the durability of the cylinder is improved.

[Brief explanation of the drawing]

1 and 2 are partially longitudinal sectional front views of a hydraulic shock absorber using a suspension spring initial setting load adjusting device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Hydraulic shock absorber, 2... Suspension spring, 3... Movable member, 4... Positioning member, 5... Pressure chamber, 6
...Piston rod, 7...Cylinder, 15...
Outer cylinder, 22...Daytent mechanism.

Claims (1)

[Scope of utility model registration request] In a hydraulic shock absorber, a piston rod is slidably inserted into a cylinder via a piston, and a suspension spring disposed on the outer circumference of the cylinder constantly biases the piston rod in the direction of extension, and an outer cylinder is provided along the cylinder. A movable member is slidably inserted between the cylinder and the outer cylinder, a pressure chamber for supplying and discharging pressure oil is provided on one side of the movable member, and a suspension spring is supported on the other side. A positioning member is movably provided on the outer circumference of the cylinder and is guided along the outer circumference of the outer cylinder. Initial setting load adjustment device for suspension springs in shock absorbers.