JP-7857138-B2 - Damping valves and shock absorbers

Inventors

• 村上 侑平
• 鈴木 均
• 鈴木 潤次郎

Assignees

• カヤバ株式会社

Dates

Publication Date

20260512

Application Date

20220330

Claims (5)

1. A valve seat member having a port and a valve seat that rises from the outer circumference of the open end of the port and surrounds the port, A leaf valve that is annular in shape and movable toward and away from the valve seat member, and that seats toward and away from the valve seat, A shim that is movable relative to the valve seat member, overlaps the leaf valve on the side opposite the valve seat member, and has an outer shape smaller than the leaf valve, A disk that is movable relative to the valve seat member and has a disk-side port that penetrates axially in a range on the inner side of the leaf valve's outer circumference from the axial direction, and is superimposed on the side of the shim opposite the valve seat member, A damping valve characterized by comprising a spring member disposed on the side of the disc opposite to the valve seat member and biasing the disc, the shim, and the leaf valve toward the valve seat member.
2. The damping valve according to claim 1, characterized in that the valve seat member side end of the disc is flat.
3. The valve seat member is axial in shape and extends axially with respect to the valve seat member, and includes a guide member on which the shim and the disk are mounted so as to be slidable in the axial direction, The damping valve according to claim 1 or 2, characterized in that the shim has a notch on its inner circumference that forms a gap between it and the guide member.
4. It has an annular top and a plurality of legs hanging down from the outer circumference of the top, and is equipped with a spring receiver whose lower end is fitted onto the outer circumference of the valve seat member, The spring member is interposed between the top of the spring receiver and the disk. The end of the spring member opposite the valve seat member is in contact with the top and leg portions of the spring support. The damping valve according to any one of claims 1 to 3, characterized in that the side end of the disc opposite the valve seat member is flat.
5. A buffer body having an outer shell, a rod inserted into the outer shell so as to be movable in the axial direction, and at least two working chambers through which liquid flows as the rod moves relative to the outer shell, A shock absorber characterized by comprising a damping valve according to any one of claims 1 to 4 provided between the operating chambers.

Description

This invention relates to damping valves and shock absorbers. Damping valves are used in the base valve section of shock absorbers used in vehicle suspensions, etc. Such a damping valve, for example, comprises an annular valve case having a port that separates a compression chamber and a reservoir within the shock absorber and connects the two chambers, and an annular valve seat surrounding the outer circumference of the port; a cylindrical guide rod inserted through the inner circumference of the valve case; an annular leaf valve stacked on the valve case so as to be axially retractable and retractable to open and close the port; an annular disc slidably mounted on the outer circumference of the guide rod and retractable to the valve case, having a support projection that supports the inner circumference of the leaf valve on the side opposite the valve case; a spring receiver housing the leaf valve and disc, having a top and multiple legs that hang down from the outer circumference of the top and fit onto the outer circumference of the valve case; and a coil spring interposed between the top of the spring receiver and the disc, biasing the leaf valve toward the valve case together with the disc (see, for example, Patent Document 1). Furthermore, for the flow of hydraulic fluid from the reservoir to the pressure chamber, the leaf valve and disc compress the coil spring, separating them from the valve case and opening the port. Conversely, for the hydraulic fluid flow from the pressure chamber to the reservoir, the hydraulic fluid attempting to pass through the holes in the disc pushes the inner circumference of the leaf valve toward the valve case, causing it to flex. This creates a gap between the leaf valve and the support projection, through which the hydraulic fluid passes. The damping valve generates a damping force by resisting the flow of hydraulic fluid through this gap between the leaf valve and the support projection. Japanese Patent Publication No. 2005-69422 This is a cross-sectional view of a shock absorber to which a damping valve according to one embodiment is applied.This is an enlarged cross-sectional view of a piston portion to which a damping valve of one embodiment is applied.This is a plan view of a shim in a damping valve according to one embodiment. The valve and shock absorber of the present invention will be described below with reference to the figures. In one embodiment, the damping valve V is used as the damping valve for the piston portion of the shock absorber D, as shown in Figure 1. The damping valve V and shock absorber D will be described in detail below. The shock absorber D comprises a shock absorber body 1, which includes an outer shell 2 and a rod 3 inserted axially into the outer shell 2; and a damping valve V, which is provided between two working chambers formed within the shock absorber body 1: an extension chamber R1 and a compression chamber R2. The shock absorber body 1 comprises a cylinder 4, a piston 5 that is movably inserted into the cylinder 4 and divides the inside of the cylinder 4 into an extension chamber R1 and a compression chamber R2, a rod 3 inserted into the cylinder 4 and connected to the piston 5, and an outer shell 2 that covers the cylinder 4 and forms a reservoir chamber R between it and the cylinder 4. The cylinder 4 is cylindrical, and as described above, a piston 5 is movably inserted inside. An extension chamber R1 is located above the piston 5 in Figure 1, and a compression chamber R2 is located below it in Figure 1. Both the extension chamber R1 and the compression chamber R2 are filled with a liquid, specifically, for example, hydraulic fluid. Note that other liquids such as water or aqueous solutions may also be used. Furthermore, the cylinder 4 is housed within a bottomed cylindrical outer shell 2 positioned on its outer circumference, and a reservoir chamber R is formed in the annular gap between the cylinder 4 and the outer shell 2. In this case, the reservoir chamber R is filled with hydraulic fluid and gas. When using liquid hydraulic fluid, it is preferable to use an inert gas such as nitrogen to prevent deterioration of the hydraulic fluid. A valve case 6 is fitted to the lower end of the cylinder 4 in Figure 1, and the valve case 6 separates the pressure chamber R2 from the reservoir chamber R. A rod guide 8, which slidably supports the rod 3, is fitted to the upper end of the cylinder 4 in Figure 1. This rod guide 8 is fitted to the inner circumference of the outer shell 2 and fixed to the outer shell 2 by crimping the upper end of the outer shell 2. When the rod guide 8 is fixed to the outer shell 2 in this way, the cylinder 4 is sandwiched between the valve case 6 and the rod guide 8, which are placed on the bottom of the outer shell 2, and the cylinder 4 is fixed inside the outer shell 2 together with the valve case 6. Alternatively, instead of crimping the upper opening of the outer shell 2, a cap may be screwed onto the up