US-12618449-B2 - Shock absorber

US12618449B2US 12618449 B2US12618449 B2US 12618449B2US-12618449-B2

Abstract

This shock absorber includes a cylinder having an inner chamber; a cage body partitioning the inner chamber into first and second chambers, and includes a first passage allowing communication between the first and second chambers, a first seat part, a second passage allowing communication between the first and second chambers, and a second seat part. A first valve which is a first valve coming into contact with the first seat part to close the first passage and being separated from the first seat part to open the first passage, and in which a communication hole communicating with the second passage is formed. A second valve comes into contact with the second seat part to close the second passage and is separated from the second seat part to open the second passage. A passage adjusting disc is provided between the first valve and the cage body.

Inventors

Markus STEEB
Shivanand Sankaran
Andrew Feldkamp

Assignees

HITACHI ASTEMO, LTD.

Dates

Publication Date: 20260505
Application Date: 20230427

Claims (3)

1 . A shock absorber comprising: a cylinder having an inner chamber; a cage body partitioning the inner chamber into a first chamber and a second chamber, the cage body including a first passage allowing communication between the first chamber and the second chamber, a first seat part provided to surround an end portion of the first passage on the first chamber side, a second passage allowing communication between the first chamber and the second chamber, and a second seat part provided to surround an end portion of the second passage on the second chamber side; a first valve configured to come into contact with the first seat part to close the first passage and being separated from the first seat part to open the first passage, and in which a communication hole communicating with the second passage is formed; a second valve configured to come into contact with the second seat part to close the second passage and being separated from the second seat part to open the second passage; and a passage adjusting disc provided between the first valve and the cage body to reduce the second passage, wherein the passage adjusting disc has an annular shape, the passage adjusting disc has a through hole penetrating in an axial direction between an inner circumferential portion and an outer circumferential portion thereof, and an engaging part is provided in the cage body and the passage adjusting disc to engage them with each other for positioning the passage adjusting disc in a circumferential direction with respect to the cage body.
2 . The shock absorber according to claim 1 , wherein the passage adjusting disc has an annular shape and partially covers the second passage in a radial direction of the cage body.
3 . The shock absorber according to claim 1 , wherein the passage adjusting disc has an annular shape with a part missing and partially covers the second passage in a circumferential direction of the cage body.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a shock absorber. Description of Related Art There are shock absorbers including a valve assembly having valve discs on both sides of a valve body (see, for example, the specification of U.S. Pat. No. 8,297,418). Incidentally, there has been a demand to suppress an increase in cost in shock absorbers. Accordingly, an objective of the present invention is to provide a shock absorber in which an increase in cost can be suppressed. SUMMARY OF THE INVENTION In order to achieve the above-described objective, one aspect of a shock absorber of the present invention includes a cylinder having an inner chamber inside, a cage body partitioning the inner chamber into a first chamber and a second chamber, and including a first passage allowing communication between the first chamber and the second chamber, a first seat part provided to surround an end portion of the first passage on the first chamber side, a second passage allowing communication between the first chamber and the second chamber, and a second seat part provided to surround an end portion of the second passage on the second chamber side, a first valve coming into contact with the first seat part to close the first passage and being separated from the first seat part to open the first passage, and in which a communication hole communicating with the second passage is formed, a second valve coming into contact with the second seat part to close the second passage and being separated from the second seat part to open the second passage, and a passage adjusting disc provided between the first valve and the cage body to reduce the second passage. According to the above-described aspect of the present invention, it is possible to suppress an increase in cost. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a shock absorber of a first embodiment according to the present invention. FIG. 2 is a cross-sectional view showing a body valve assembly of the shock absorber of the first embodiment according to the present invention. FIG. 3 is a plan view showing a cage body of the shock absorber of the first embodiment according to the present invention. FIG. 4 is a cross-sectional perspective view showing a portion of components of the body valve assembly of the shock absorber of the first embodiment according to the present invention. FIG. 5 is a perspective view showing a portion of components of the body valve assembly of the shock absorber of the first embodiment according to the present invention. FIG. 6 is a plan view showing another passage adjusting disc of the shock absorber of the first embodiment according to the present invention. FIG. 7 is a plan view showing yet another passage adjusting disc of the shock absorber of the first embodiment according to the present invention. FIG. 8 is a plan view showing still another passage adjusting disc of the shock absorber of the first embodiment according to the present invention. FIG. 9 is a plan view showing modified example 1 of the cage body of the shock absorber of the first embodiment according to the present invention. FIG. 10 is a plan view showing a cage body of a shock absorber of a second embodiment according to the present invention. FIG. 11 is a plan view showing a passage adjusting disc of the shock absorber of the second embodiment according to the present invention. FIG. 12 is a plan view showing a state in which the passage adjusting disc is placed on the cage body of the shock absorber of the second embodiment according to the present invention. FIG. 13 is a perspective view showing a cage body of a shock absorber of a third embodiment according to the present invention. FIG. 14 is a perspective view showing a passage adjusting disc of the shock absorber of the third embodiment according to the present invention. FIG. 15 is a perspective view showing a state in which the passage adjusting disc is placed on the cage body of the shock absorber of the third embodiment according to the present invention. FIG. 16 is a plan view showing a state in which one passage adjusting disc is placed on a cage body of a shock absorber of a fourth embodiment according to the present invention. FIG. 17 is a plan view showing a state in which another passage adjusting disc is placed on the cage body of the shock absorber of the fourth embodiment according to the present invention. FIG. 18 is a plan view showing a state in which yet another passage adjusting disc is placed on the cage body of the shock absorber of the fourth embodiment according to the present invention. FIG. 19 is a plan view showing a state in which one passage adjusting disc is placed on a cage body of a shock absorber of a fifth embodiment according to the present invention. FIG. 20 is a plan view showing a state in which another passage adjusting disc is placed on the cage body of the shock absorber of the fifth embodiment according to the p