JPH09291963A - Non-return spring in hydraulic shock absorber - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A non-return spring is prevented from being entangled with each other while being packaged or transported in a component state, thereby enabling automatic supply of the non-return spring by a parts feeder, and a piston rod assembly. To facilitate automatic assembly of the. SOLUTION: The valve stopper is a non-return spring that seats a rear seat surface of a piston that constitutes a hydraulic shock absorber and biases a non-return valve that is vertically movable in a cylindrical portion of a valve stopper from the rear side. The inner peripheral side 103A is supported by the cylindrical part of the outer peripheral side 103A, and the outer peripheral side end 103 for urging the non-return valve from the rear side
B was brought into contact with the inner winding portion 103C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a piston part of a hydraulic shock absorber for suppressing vibration of a vehicle body such as a suspension system of an automobile, and more particularly to an improvement of a non-return spring.

[0002]

2. Description of the Related Art FIG. 3 shows a structure of a main part of a conventional hydraulic shock absorber mainly including a piston part. Generally, a hydraulic shock absorber mounted on the wheel side via a coupling member accommodates a cylinder 13 equipped with a piston rod assembly 1 and a base valve BV in an outer cylinder 17 and seals the outside air.
Packing case 16 with rod guide 14 inserted
Is press-fitted from above the outer cylinder 17, and then the upper end of the outer cylinder 17 is sealed by welding or the like. A tank chamber C filled with about half of the hydraulic oil is formed between the cylinder 13 and the outer cylinder 17.

[0003] This configuration will be described below in the order of assembling the parts. A base valve BV is mounted at a lower end of the cylinder 13 which forms an outer shell of the hydraulic chamber of the hydraulic shock absorber. The main function of the base valve BV is that when the piston rod assembly 1 descends, the disc-shaped leaf valve 21 whose inner peripheral side is fixed is pushed open by passing through the inner peripheral port 20B of the base valve case 20, and the piston rod assembly 1 is opened. When the hydraulic oil corresponding to 1 inflow volume is discharged from the piston lower chamber B to the tank chamber C, a compression-side damping force is generated by the passage resistance.

A sub-function is that when the piston rod assembly 1 is raised, it passes through the outer peripheral port 20A of the base valve case 20, is urged by the non-return spring 19, and is guided vertically by the cylindrical portion 18A of the valve stopper 18. Then, the non-return valve 22 is pushed open to suck the hydraulic oil from the tank chamber C for the retreated volume of the piston rod assembly 1.

[0005] A piston 5 which defines the inside of a cylinder 13 as upper and lower chambers is attached to the piston rod assembly 1, and the upper end of the piston rod assembly 1 is attached to a vehicle body via a connecting member (not shown). ), Operating in the state shown in FIG. When assembling the piston rod assembly 1, the piston rod body 1B is turned upside down in FIG.
And fix it on the turntable.

As a result, the piston rod spigot part 1A inevitably faces upward, so that the valve stopper 2, the spiral non-return spring 3 and the cylindrical portion 2A of the valve stopper 2 are provided on the inner peripheral side. The non-return valve 4 in which the support leg formed on the guide is guided, the piston 5 having the piston ring 6 and the guide metal 7, the leaf valve 8, the canzer 9, the main valve 10 and the spring 11
Insert in the order of. Finally, screw in the piston nut 12,
The piston rod assembly 1 is fastened by a fastening tool such as an air runner, and is inserted into the state shown in FIG. 3 from above the cylinder 13 filled with hydraulic oil. After that, the upper end of the cylinder 13 is closed by the rod guide 14 that guides the piston rod 1 to form a sealed hydraulic chamber.

Here, in the non-return spring 3, as shown in FIG. 3B, an inner peripheral side support portion 3A formed in a substantially annular shape is supported by the cylindrical portion 2A of the valve stopper 2. The outer peripheral side is formed so as to bias the non-return valve 4 from the back surface.

Next, the operation of the piston rod assembly 1 will be briefly described. When the piston rod assembly 1 rises in the cylinder 13 filled with the hydraulic oil, the hydraulic oil in the closed upper piston chamber A is supplied to the opening 4A between the support legs of the non-return valve 4 and the piston 5
Then, the disc-shaped leaf valve 8 urged by the spring 11 via the main valve 10 to push open the inner peripheral side, and flows out into the piston lower chamber B. The passage resistance at this time becomes the extension side damping force. Hydraulic oil corresponding to the withdrawal volume that is insufficient due to the rise of the piston rod assembly 1 is sucked from the tank chamber C via a base valve BV disposed at the lower end of the cylinder 13.

The non-return valve 4 is a valve stopper 2
Is vertically movably guided by the cylindrical portion 2A of the piston 5 and is urged by the non-return spring 3 to be seated on the rear seat surface 5C of the piston 5 to close the outer peripheral port 5A of the piston 5 and the piston rod assembly 1 rises. In doing so, the working oil acts so as to pass only through the inner peripheral port 5B. Conversely, when the piston rod assembly 1 descends, the hydraulic oil in the lower chamber B is replenished to the piston upper chamber A whose capacity increases by pushing and opening the non-return valve 4 through the outer peripheral port 5A.

[0010]

As described above, the outer peripheral side of the non-return spring 3 urges the non-return valve 4 from the back side by its elastic force. In order to facilitate the above, the gap F wider than the wire diameter of the winding is opened. For this reason, the windings of other components enter through the gap F while being packed or transported in a component state, so that they are entangled with each other. As a result, during automatic assembly of the piston rod assembly,
It was difficult to automatically supply the parts using the parts feeder, and the neck process required human labor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the non-return springs from being entangled with each other while being packaged or transported in a component state. Enables the automatic supply of non-return springs by the parts feeder,
It is to facilitate automatic assembly of the piston rod assembly.

[0012]

[Means for Solving the Problems] The first means adopted by the present invention in order to solve the above problems will be described with reference to the reference numerals used in the first embodiment. A non-retan spring that urges the non-return valve 4 seated on the seat surface 5C of the piston 5 and vertically guided by the cylindrical portion 2A of the valve stopper 2 from the back side. The inner peripheral side 103A is supported, and the outer peripheral side terminal 103B for urging the non-return valve 4 from the back is brought into contact with the inner winding portion 103C. "

The second means will be described with reference to the reference numerals used in the second embodiment. "The cylinder portion 2A of the valve stopper 2 is seated on the seat surface 5C of the piston 5 which constitutes the hydraulic shock absorber. In the non-return spring for urging the non-return valve 4 guided up and down, the inner peripheral side 203A is supported by the cylindrical portion 2A of the valve stopper 2, and the non-return valve 4 is pushed from the back. The gap G between the urging outer peripheral side 203B and the inner winding portion 203C is made smaller than the wire diameter d. "

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The non-return spring of the hydraulic shock absorber is used for both the piston portion (3) and the base valve portion (19) as shown in FIG. 3, but is functionally the same. Therefore, hereinafter, a case where the non-return spring of the present invention is applied to the piston portion will be described based on the first embodiment shown in FIG. The biggest difference from the non-return spring explained in the prior art is the terminal 103B on the outer peripheral side.
In the part. That is, as shown in FIG. 3B, the conventional non-retan spring has a gap F wider than the wire diameter d between the outer peripheral end 3B and the inner winding portion. In the case of the non-return spring 103, the end of the terminal 103B is formed in contact with the inner winding portion 103C (generally the start portion of the end turn) by devising a forming jig of the winding machine.

That is, since the inner peripheral side support portion 103A and the outer peripheral side end turn portion are both formed in a substantially circular ring shape, they cannot be entangled with each other even if they are packed or transported in a component state, and they are not entangled with each other. Are maintained in an independent single part condition.
As a result, since it is easy to separate into a single part, it is possible to automatically supply the parts by the parts feeder at the time of automatically assembling the piston rod assembly, and it is possible to eliminate the need for a manual neck process.

In the above-described first embodiment, the case where the outer peripheral end contacts the inner winding portion has been described. However, in order to prevent the parts from being entangled with each other, the outer peripheral end is not always required. It is not necessary to limit the shape to abut the inner winding portion, and as shown in the second embodiment of FIG.
There may be some gap G between 3B and the inner winding portion 203C. That is, since the windings of other components do not get entangled with each other unless the windings of other components enter the gap G, the gap G may be formed to be smaller than the wire diameter d of the winding. The presence of the gap G simplifies the molding jig of the winding machine as compared with the first embodiment, and improves the productivity of the non-return spring 203.

The case where the non-return spring according to the present invention is applied to the piston part has been described above. However, in the case where the non-return spring is applied to the base valve BV part, due to the difference in the size of the mounting part and the set load, Only the dimensions of the circumferential side support portion and the outer circumferential side end turn portion, the wire diameter of the winding, the number of turns, the height, etc. are different, and structurally the same as the above-mentioned piston portion, it will be described. Is omitted.

[0018]

As described in detail above, in the present invention,
By contacting the outer peripheral side end of the non-return spring with the inner winding part, or by making the gap between the outer peripheral side end and the inner winding part smaller than the wire diameter of the winding, It is possible to automatically supply parts by the parts feeder when assembling the piston rod assembly automatically by simply molding so that it can not be entangled with each other, it is possible to eliminate the neck process that requires manual labor and greatly increase productivity. Can be improved.

[Brief description of drawings]

FIG. 1A is a plan view showing a shape of a non-retan spring according to a first embodiment of the present invention. (B) It is a side view of the non-return spring according to the first embodiment.

FIG. 2A is a plan view showing the shape of a non-retan spring according to the second embodiment of the present invention. (B) It is a side view of the non-return spring according to the second embodiment.

FIG. 3A is a vertical cross-sectional view of a hydraulic shock absorber showing a use part of a non-retan spring according to a conventional technique. (B) is a plan view showing the shape of a non-return spring according to the related art.

[Explanation of symbols]

 2, 18 Valve stopper 2A, 18A Cylindrical portion of valve stopper 4,22 Non-retan valve 5C Rear seat surface of piston 20C Rear seat surface of base valve case 103,203 Non-return spring 103A, 203A Inner peripheral side support portion 103B, 203B Terminals 103C, 203C on the outer peripheral side Inside winding part (starting part of end turn)

Claims (3)

[Claims] 1. A non-retan spring which seats on a rear seat surface of a piston constituting a hydraulic shock absorber, and biases a non-retan valve, which is vertically movable and guided by a cylindrical portion of a valve stopper, from a rear surface thereof. An inner peripheral side is supported by the cylindrical portion of the stopper, and an outer peripheral side end for urging the non-retan valve from the back is brought into contact with the inner winding portion. spring. 2. A non-retan spring for urging a non-retan valve seated on a rear seat surface of a piston constituting a hydraulic shock absorber and vertically guided by a cylindrical portion of a valve stopper from a rear surface thereof. The hydraulic pressure is characterized in that the inner peripheral side is supported by the cylindrical portion of the stopper, and the gap between the outer peripheral side end that biases the non-return valve from the rear side and the inner winding portion is narrower than the wire diameter. Non-return spring in shock absorber. 3. A non-retan valve which is seated on a rear seat surface of a base valve case which constitutes a hydraulic shock absorber and is vertically guided by a cylindrical portion of a valve stopper is biased from the rear surface. A non-return spring in the hydraulic shock absorber according to claim 1.