JP2003254373A - Hydraulic shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic shock absorber, in which a tank is mounted to a cylinder body easily and smoothly and whose structure is simple, by forming a passage connecting an oil chamber on a side opposite to a rod of a cylinder tube and an oil chamber in a tank with simple machining to solve a problem. <P>SOLUTION: The hydraulic shock absorber comprises: a tube portion 8 with a joint portion 4 extended from the cylinder tube 21 to a side; a tubular socket 9 extended from a tank case 1; and a hollow bolt 10 for tightening to attach the tubular socket to a tube portion side and incorporating a damping valve. The hollow bolt is screwed from the outside of the tubular socket into a tubular portion to hold the tubular socket between the tubular portion and the hollow bolt. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hydraulic shock absorber suitable for use in suspension systems such as motorcycles and snowmobiles.

[0002]

2. Description of the Related Art As a hydraulic shock absorber of this type, one shown in FIGS. 4 and 5 has been developed.
Cylinder body B consists of cylinder body B and tank C
Includes a cylinder tube 21 and a rod-side oil chamber and an anti-rod-side oil chamber 22 that are partitioned by a piston in the cylinder tube 21, and the tank C is a tank case 23 and a gas partitioned in the tank case 23. The tank case 23 is provided with a chamber 24 and an oil chamber 25, and is connected via a joint portion 27 formed between the tank case 23 and the outer circumference of the cylinder tube 21, and the rod-side oil chamber 22 and the tank oil chamber 25 are connected to each other. Joint part 2
The passages a and b formed in 7 communicate with the valve mechanism D.

The tank case 23 and the joint portion 27 are generally integrally formed by casting, and the passages a and b are formed inside the joint portion 27 by a core of the casting.

[0004]

Although the conventional hydraulic shock absorber described above has no functional problem, when the mounting position of the tank C with respect to the cylinder body B is changed, a mold is prepared according to its shape. Therefore, there are various problems in terms of production.

Further, the passages a and b formed in the joint portion 27
Is cast and formed inside the joint portion 27 by a cast shell core, so that the cost for the shell core increases, and
There are also disadvantages in casting problems such as defective porosity.

Therefore, in order to solve this problem, a method of separately forming a cylinder body and a tank case and then joining the two together has also been adopted. In this case, the conventional method is as follows.
It has a large number of parts and a large number of assembling steps, which complicates the manufacturing process and increases the manufacturing cost, which is economically disadvantageous.

In order to solve the above problems, the present invention provides a hydraulic shock absorber in which the tank can be easily and smoothly mounted on the cylinder body, and the mounting angle to the tank can be easily adjusted and the structure is simple. To aim.

[0008]

In order to achieve the above object, the means of the present invention comprises a cylinder body and a tank, and the cylinder body includes a rod-side oil chamber defined by a piston in a cylinder tube. Equipped with an oil chamber on the opposite side of the rod,
The tank includes a tank case and a gas chamber and an oil chamber defined in the tank case, the tank case is coupled to the cylinder tube through a joint portion, and the non-rod side oil chamber and the tank side oil chamber are the joint portion. In the hydraulic shock absorber communicating with the oil passage provided in the oil passage via the valve provided in the oil passage, the joint portion has a tubular portion that extends laterally from the cylinder tube, and a tubular socket that extends from the tank case. , A hollow bolt that has a damping valve built into the tubular socket and is fastened to the tubular part side, and the hollow bolt is screwed into the tubular part from the outside of the tubular socket. It is assumed that the cylindrical socket is clamped.

In this case, the cylindrical portion is provided with a first oil passage communicating with the oil chamber on the side opposite to the rod, the cylindrical socket is provided with a second oil passage communicating with the oil chamber on the tank side, and the hollow bolt is provided with first and second oil passages. A third oil passage communicating with the second oil passage and a damping valve provided in the third oil passage are provided, and a hollow bolt is screwed from the outside of the cylindrical socket toward the first oil passage. Is preferred.

Similarly, a cylindrical portion and a locking step portion connected to the cylindrical portion are formed at the end portion of the cylindrical portion, and a hollow bolt is constituted by a valve body having a flange at the outer end, and is inserted into the cylindrical portion. The socket may be sandwiched between the locking step portion and the flange.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
3 to FIG. 3, the hydraulic shock absorber A of the present invention will be described.
1 is a cylinder body B1 and a tank C as shown in FIG.
1 and a suspension spring S, and a cylinder body B1
Is provided with a rod-side oil chamber and an anti-rod-side oil chamber 22 that are partitioned by a piston P in a cylinder tube 21, and a tank C1 is a tank case 1 and a gas chamber 2 and an oil that are partitioned in the tank case 1. And chamber 3.

Further, the tank case 1 is connected to the cylinder tube 21 through the joint portion 4, and the oil chamber 2 on the side opposite to the rod side is formed.
2 and the tank-side oil chamber 3 communicate with each other through the first and second oil passages 5 and 6 provided in the joint portion 4 and the valve 7 provided in the oil passages 5 and 6.

In the present embodiment, the joint portion 4 is
Is composed of a tubular portion 8 extending from the cylinder tube 21, a tubular socket 9 extending from the tank case 1, and a hollow bolt 10 also serving as a valve body for fastening the tubular socket 9 to the tubular portion 8 side. There is.

Further, the tubular socket 9 is fitted to the end of the tubular portion 8, and the hollow bolt 10 is screwed into the tubular portion 8 from the outside of the tubular socket 9, and the tubular portion 8 and the hollow bolt 10 are joined together. The cylindrical socket 9 is clamped.

Specifically, a cylindrical portion 11 and a locking step portion 12 connected to the cylindrical portion 11 are formed at the end of the cylindrical portion 8, and the hollow bolt 10 is formed as a valve body having a flange 13 at the outer end. Then, the cylindrical socket 9 inserted in the cylindrical portion 11 is held between the locking step portion 12 and the flange 13.

By the way, when FIG. 2 is a front view of the hydraulic shock absorber A1, the cylinder body B1 has a mounting bracket 14
The tank C1 is connected to the vehicle body side via the mounting bracket 15 and is connected to the wheel side via the mounting bracket 15, and the tank C1 is disposed laterally with respect to the cylinder body B1.

As shown in FIG. 1, the cylinder portion 8 is provided so as to project laterally from the cylinder body B1, and the tank C1 rotates about the cylinder portion 8 as will be described later.
This tank C1 is indicated by an arrow Y so as not to interfere with other members.
The mounting position can be arbitrarily adjusted in the direction (FIG. 1).

A first oil passage 5 communicating with the oil chamber 22 on the opposite rod side is machined from the front side in the cylindrical portion 8, and similarly, the cylindrical socket 10 communicates with the oil chamber 3 on the tank side. Two
The oil passage 6 is cut.

Further, a vertical and horizontal third oil passages 15 and 16 communicating with the first and second oil passages 5 and 6 to the hollow bolt 10 and a valve 7 provided in the third oil passages 15 and 16. The hollow bolt 10 is screwed from the outside of the cylindrical socket 9 toward the inside of the first oil passage 5.

As a result, the cylindrical socket 9 is sandwiched between the locking step portion 12 and the flange 13 while being fitted into the cylindrical portion 11 as described above, and moreover, before the hollow bolt 9 is fastened. By rotating about, the mounting position is adjusted in the vertical direction as shown by the arrow Y in FIG.

The valve 7 is composed of a compression side damping valve 17 which is a leaf valve as well known, a spring 19 which biases the compression side damping valve 17 in a closing direction, and a check valve 18 which is a leaf valve that overlaps with the compression side damping valve 17. I am letting you.

The hollow bolt 10 also serves as a valve body, and an adjuster 20 is provided in the end portion of the hollow bolt 10.
Is rotatably screwed, a spring 19 is interposed between the adjuster 20 and the compression side damping valve 17, and the initial spring load of the spring 19 is adjusted according to the stroke of the adjuster 20 to reduce the damping force of the compression side valve 17. Can be adjusted arbitrarily.

The spring 19 may be brought into direct contact with the end face of the adjuster 20, but it may be carried by a washer that is slidable in the axial direction as shown in the drawing, and this washer may be brought into contact with the adjuster 20.

According to the above hydraulic shock absorber A1, the piston rod enters the cylinder tube 21 during the compression operation, and at this time, the oil corresponding to the piston rod intrusion volume from the oil in the oil chamber 22 opposite to the rod is the first oil. Pressure side damping valve 17 from line 5
And further flows out to the oil chamber 3 on the tank side through the third oil passage 15 and the second oil passage 6, and the compression side damping valve 17 generates a compression side damping force.

During the extension operation, the piston rod retracts from the cylinder tube 21, and the third oil passage 6 from the tank C1.
-Second oil passage 15-Check valve 18-Oil of the piston rod retreat volume is introduced into the anti-rod side oil chamber 3 which expands via the first oil passage 5.

[0026]

The present invention has the following effects.

According to the inventions of the respective claims, since the cylinder body and the tank case are simply connected by the three members of the tubular portion, the tubular socket, and the hollow bolt having the damping valve built therein, the mounting portions for both are attached. The structure is simple, the mounting angle of the tank with respect to the cylinder can be changed, the number of parts is small, the workability and the assemblability are improved, and it is economically advantageous.

Similarly, since the tank case can be detachably connected via a hollow bolt, the cylinder body, the tank case, the hollow bolt and the valve can be freely repaired and replaced, and the position of the tank case can be adjusted each time.

According to the invention of claim 2, since the first and second oil passages can be formed by mechanical cutting without using the core, the cost for the core can be saved and the casting can be performed. Problems such as nest defects do not occur and workability and economic efficiency can be improved.

According to the third aspect of the present invention, since the tank-side tubular socket is inserted into the tubular portion-side cylindrical portion, the tubular socket can be rotated around this tubular portion, and the tank case can be rotated along the rotational direction. The arrangement position can be adjusted arbitrarily to prevent interference with other members.

[Brief description of drawings]

FIG. 1 is an enlarged plan view crossing the line KK of FIG.

FIG. 2 is a partially longitudinal front view of the hydraulic shock absorber according to the present invention.

3 is a partially cutaway left side view of FIG. 2. FIG.

FIG. 4 is a partial vertical front view of a conventional hydraulic shock absorber.

5 is a cross-sectional plan view taken along the line EE of FIG.

[Explanation of symbols]

1 tank case 2 gas chamber 3 oil chamber 4 joint 5 first oil passage 6 Second oil passage 7 valves 8 tube 9 Cylindrical socket 10 Hollow bolt 11 cylindrical part 12 Lock step 13 flange 15, 16 Third oil passage 17 damping valve 21 cylinders 22 Anti-rod side B1 Cylinder body C1 tank

Claims (3)

[Claims] 1. A cylinder body and a tank, wherein the cylinder body includes a rod-side oil chamber and an anti-rod-side oil chamber that are defined in a cylinder tube through a piston, and the tank is divided into a tank case and a tank case. The tank case is coupled to the cylinder tube through a joint, and the oil chamber opposite the rod side and the tank side oil chamber are provided in the joint and an oil passage in this oil passage. In a hydraulic shock absorber that communicates via a valve provided on the cylinder tube, the joint part is laterally extended from the cylinder tube, the tubular socket is extended from the tank case, and the tubular socket is tightened to the tubular portion side. It consists of a hollow bolt that has a damping valve built-in inside, and the hollow bolt is screwed into the tubular part from the outside of the tubular socket, and the tubular socket is sandwiched between the tubular part and the hollow bolt. Characteristic hydraulic shock absorber. 2. A first oil passage communicating with the oil chamber opposite to the rod is provided in the tubular portion, a second oil passage communicating with the oil chamber in the tank is provided in the cylindrical socket, and the hollow bolt is provided with first and first oil passages. A third oil passage communicating with the second oil passage and a damping valve provided in the third oil passage are provided, and a hollow bolt is screwed from the outside of the cylindrical socket toward the first oil passage. The hydraulic shock absorber according to claim 1. 3. A tubular body formed by forming a cylindrical portion and a locking step portion connected to the cylindrical portion at an end portion of the tubular portion, and forming a hollow bolt with a valve body having a flange at an outer end, and inserting the hollow bolt into the cylindrical portion. The socket is sandwiched between the locking step portion and the flange.
Or a hydraulic shock absorber of 2.