JPH04101831U - Hydraulic shock absorber valve structure - Google Patents

Abstract

(57) [Summary] [Purpose] The orifice characteristics generated in the orifice hole that communicates the oil chambers on both sides separated by the piston sliding inside the cylinder of the hydraulic shock absorber are evaluated during compression or expansion. Occurs only in one stroke. [Structure] A tongue piece 7" integrally attached to the outer periphery of the pressure side valve 7 that closes the upper oil chamber A opening of the main port 5.
The opening of the orifice hole 17 on the upper oil chamber A side is closed.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a valve structure for a hydraulic shock absorber installed in a vehicle such as an automobile.

0002

[Conventional technology]

A piston is attached to the tip of the piston rod that is inserted into the cylinder. The oil chamber inside the cylinder is divided into two chambers, and the piston has multiple mechanisms that communicate the two chambers. The import is drilled in the axial direction, and the oil is inserted into the open end of the main port on both sides of this piston. A disc valve is installed that generates damping force when the pressure buffer is expanded and compressed. In addition to the main port, there is an orifice hole that communicates the oil chambers on both sides of the piston. disc valves arranged at the main port opening ends on both sides of the piston. The valve makes the operation smooth at low speeds until the piston speed reaches the speed at which the valve opens. There is a lube mechanism.

0003 In such a valve device, the damping force characteristics at low speeds depend on this orifice hole. The result is the same when compressing and decompressing. Therefore, for example, at low speeds An attempt is made to make the damping force characteristics during extension different from the damping force characteristics during compression. Inconveniences arise when

0004

[Problem that the idea aims to solve]

This proposal attempts to solve the above problem, and the damping force characteristics of one side are different from those of the other. The aim is to provide a valve structure that does not affect the damping force characteristics. target

[0005]

[Means to solve the problem]

In order to solve the above problems, the feature of this invention is that the opening of the main port of the piston The piston is connected to one of the expansion side valves or pressure side valves installed in the piston. Features an integrally formed tongue piece that closes the orifice hole that communicates the oil chambers on both sides. shall be.

[0006]

[Effect]

One opening of the orifice hole is formed by a tongue piece integrally formed on the disc valve. Since the piston is closed, both sides of the piston must be closed when moving in one direction. Close the communicating orifice hole and close the tongue of the disc valve when moving in the other direction. The orifice hole opens and communicates with the orifice hole, so the orifice characteristics at low speed of the piston are improved. Obtained only when the piston moves in one direction.

[0007]

【Example】

Hereinafter, an embodiment of the present invention will be described based on FIG. Tip of piston rod 1 A piston 2 is attached to the small diameter part of the piston 2, and the piston 2 is fitted into an annular groove on the outer periphery of the piston 2. It is slidably inserted into the cylinder 4 via the piston ring 3. fixie The cylinder 2 has a plurality of annular main ports 5 and 6 communicating with the oil chamber in the cylinder 4. It is located in

[0008] A disc valve is installed at the upper open end of one main port 5 formed on the piston. 7 is provided to normally close the main port 5. Also, below the other main port 6. A disc valve 11 is provided at the opening end of the section to close the main port 6 and close the main port 6. The lower open end of the port 5 forms an opening 20 that is always open between it and the disc valve 11. However, when the piston rod moves downward, the hydraulic oil in the oil chamber B on the high pressure side is It flows from the lower opening 20 of the port 5, passes through the main port 5, and enters the main port. The oil flows into the upper oil chamber A by bending the disc valve 7 that closes the upper opening end of the oil tank 5 upward. to generate damping force during compression.

[0009] Similarly, the upper open end of the main port 6 is always connected to the disc valve 7. When the piston rod moves upward, it forms an opening 21 that opens when the piston rod is moved upward. The hydraulic oil in the oil chamber A flows through the upper opening 21 of this main port 6 and enters the main port. The disc valve 11 that closes the lower opening end of 6 is bent downward to flow into the oil chamber B and expand. Generates a damping force during time.

0010 Note that above the disc valve 7, there is a disc valve 8 with a smaller diameter than this disc valve. The washer 9 serves as a fulcrum for the deflection of the disc valve 8, and the A valve stopper 10 that regulates the amount of lift is held between the stepped portion of the piston rod. has been done. The disc valves 7 and 8 constitute a pressure side valve. Also, disc Below the valve 11, a disc valve 1 having a smaller diameter than the disc valve 11 is also provided. 2, 13, washer 14, and valve stopper 15 are secured to the piston lock with nut 16. Fixed to the head. Disc valves 11, 12, and 13 constitute an extension valve. has been completed. Also, the orifice hole 17 that branches from the main port 5 and communicates with the upper oil chamber A is connected to the piston. The opening end of this orifice hole 17 on the upper oil chamber A side is shown in Figure 3. As shown in FIG. It is closed by a piece 7". Figure 2 is a top view of the piston 2, where the hatched area 18 is where the disc valve 7 is attached. It represents the seat surface on which you sit.

0012 Next, the operation of the valve mechanism configured as described above will be explained. First, during the compression stroke of the shock absorber, the piston moves downward and the lower oil chamber B is compressed. This results in high pressure. When the piston speed is low, the hydraulic oil flowing from the lower opening 20 is First, remove the tongue piece 7" with the smallest spring constant located on the outermost side of the disc valve. It bends and flows into the upper oil chamber A through the orifice hole 17. At this time, the hydraulic oil The resistance when passing through the hole 17 causes orifice characteristics at low piston speeds. then When the piston speed increases, the annular part 7' of the disc valve 7 is bent and the main port is closed. 5, it flows into the upper oil chamber A, and when the speed increases, it flows into the upper oil chamber A, and when the speed increases, it is arranged above the disc valve 7. The disc valve 8 that is bent also bends and flows into the oil chamber A. Therefore, at low speed of the piston is the orifice characteristic due to orifice hole 17 at higher piston speed. A damping force is generated during compression due to the valve deflection characteristics of the disc valves 7 and 8.

[0013] During the shock absorber's extension stroke, the piston rod moves upward and the upper oil chamber A closes. Since it is compressed, the upper oil chamber A becomes high pressure. During this extension, the orifice 17 is Since it is closed by the tongue piece 7'' of the valve 7, the hydraulic oil will not flow when the piston is at low speed. Pass through the main port 6 from the upper opening 21, bend the disc valve 10, and connect the lower oil to the main port 6. Flows into chamber B. Furthermore, as the piston speed increases, the back of the disc valve 11 The disc valves 12 and 13 arranged in the The damping force during expansion is determined by the valve deflection characteristics of the disc valves 11, 12, and 13. Occur. During this expansion, the orifice hole 17 is placed in the tongue portion 7'' of the disc valve 7. Therefore, since it is closed, orifice characteristics do not occur.

[0014] In addition, the shape of the valve does not have to be disc-shaped, but may be rectangular as shown in Figure 4. In addition, adding a constriction 30 to the tip makes it easier to open the piston even at low speeds. Ru.

[0015]

[Effect of the idea]

The main port through which hydraulic oil flows during compression or expansion is shaped into a piston. A valve that generates a damping force is disposed at the open end of this main port, and An orifice hole is formed in the piston that constantly communicates the oil chambers on both sides, and this orifice hole One opening of the main port is placed at the time of compression, and one opening of the main port is placed at the time of expansion. Since the orifice hole is closed by a tongue piece formed integrally with the Or, it flows only in one direction during extension, changing the orifice characteristics during compression or during extension. It can only occur on one side. Therefore, there is a difference between compression and expansion. It becomes possible to generate damping force characteristics. Also, the tongue part that closes the orifice Since it is formed integrally with the valve, manufacturing is easy.

[0016]

[Brief explanation of drawings]

[Figure 1] Cross-sectional view of the piston extension side and compression side valve mechanisms

[Figure 2] Top view of the piston

[Figure 3] Plan view of compression side disc valve

[Fig. 4] Other embodiments of the valve according to the present invention

[Explanation of symbols]

1... Piston rod, 2... Piston, 4...
Cylinder, 5, 6... Main port, 7... Compression side disc valve, 11... Rebound side disc valve, 1
7... Orifice hole, 7"... Tongue part

Claims (1)

[Scope of utility model registration request] Claim 1: The inside of the cylinder is divided into two chambers by a piston attached to a piston rod inserted into the cylinder, and a plurality of main ports communicating with the two chambers are formed in the piston, and one In a hydraulic shock absorber with a pressure side valve at the open end of the main port and a rebound side valve at the open end of the other main port, an orifice hole is formed that constantly communicates the oil chambers on both sides separated by a piston. In addition, a valve structure characterized in that a tongue portion for closing an orifice hole is integrally formed on one of the pressure side valve and the expansion side valve disposed at the open end of the main port.