KR-102962986-B1 - HYDRAULIC DAMPER FOR SEPARATELY ADJUSTING COMPRESSION AND REBOUND DAMPING FORCES

KR102962986B1KR 102962986 B1KR102962986 B1KR 102962986B1KR-102962986-B1

Abstract

A hydraulic damper for separately controlling compression and rebound damping forces according to an embodiment of the present invention comprises a cylinder housing that provides a space for receiving oil inside, a piston that reciprocates while dividing the inside of the cylinder housing into a first chamber and a second chamber, a manifold block coupled to one end of the cylinder housing and having an internal passage formed therein, and a return passage that communicates the manifold block and the second chamber, wherein a chamber communication hole communicating with the first chamber, a first check valve, a connecting passage connected to the first check valve, and a second check valve connected between the return passage and the connecting passage are disposed inside the manifold block, and the chamber communication hole, the first check valve, the connecting passage, the second check valve, and the return passage can form a single passage path through which oil flows between the first chamber and the second chamber.

Inventors

유경호

Assignees

주식회사 에스제이코퍼레이션

Dates

Publication Date: 20260511
Application Date: 20260304

Claims (10)

A cylinder housing that provides a space for accommodating oil inside; A piston that reciprocates while dividing the interior of the cylinder housing into a first chamber and a second chamber; A manifold block coupled to one end of the cylinder housing and having an internal fluid path formed therein; and It includes a return path connecting the above manifold block and the above second chamber, and Inside the above manifold block, a chamber communication hole communicating with the first chamber, a first check valve, a connecting passage connected to the first check valve, and a second check valve connected between the return passage and the connecting passage are arranged. A hydraulic damper that separately controls compression and rebound damping forces, wherein the chamber communication hole, the first check valve, the connecting passage, the second check valve, and the return passage form a single passage path through which oil flows between the first chamber and the second chamber.
In paragraph 1, The first check valve controls the damping force of the oil during the compression stroke of the piston, and The second check valve above is a hydraulic damper that separately controls compression and rebound damping forces to control the damping force of the oil during the rebound stroke of the piston.
In paragraph 1, The opening condition of the first check valve is controlled by a first adjustment screw, and the opening condition of the second check valve is controlled by a second adjustment screw. A hydraulic damper for separately controlling compression and rebound damping forces, wherein each of the first and second adjustment screws is positioned to be exposed to the outside of the manifold block, so as to allow the opening conditions of the first check valve and the second check valve to be controlled by external operation.
In paragraph 1, The first check valve above operates to restrict fluid flow in the compression stroke direction and is configured to open for fluid flow in the rebound stroke direction. A hydraulic damper that separately controls compression and rebound damping forces, wherein the second check valve above operates to restrict fluid flow in the rebound stroke direction and is configured to open to fluid flow in the compression stroke direction.
In paragraph 1, The above manifold block is a hydraulic damper that separately controls compression and rebound damping forces, provided in a modular structure that is detachably coupled to the cylinder housing.
In paragraph 1, The above connecting channel is a hydraulic damper that separately controls compression and rebound damping forces, comprising a regulating member that varies the effective cross-sectional area of the above connecting channel.
In paragraph 1, The above return path is a hydraulic damper that separately controls compression and rebound damping forces, which is disposed along the outer surface of the cylinder housing or inserted into the internal space of the cylinder housing.
In paragraph 1, A hydraulic damper for separately controlling compression and rebound damping forces, wherein the first check valve and the second check valve are formed to have different valve seat diameters, so that the basic damping characteristics in the compression stroke and rebound stroke are set differently.
In paragraph 1, Each of the first check valve and the second check valve is a hydraulic damper that separately controls compression and rebound damping forces, provided as at least one of a poppet-type valve, a ball-type valve, a flap-type valve, and a disc-type valve that are opened and closed by a spring.
In paragraph 1, In the above return euro, A hydraulic damper for separately controlling compression and rebound damping forces, further equipped with a diameter variable mechanism disposed adjacent to the inner surface and changing the effective diameter according to rotational movement.

Description

Hydraulic damper for separately adjusting compression and rebound damping forces The present invention relates to a hydraulic damper that separately controls compression and rebound damping forces. Hydraulic dampers are widely used in various mechanical and vehicle systems to absorb external vibrations or shocks and to stably control motion. Hydraulic dampers have a structure in which oil is filled inside a cylinder, and damping force is generated by utilizing the pressure difference between the two sides of the piston when the piston reciprocates. Generally, hydraulic dampers generate damping force by controlling the flow of fluid through an orifice provided inside a piston or cylinder to be limited to a specific speed. However, such single-path based damping structures have limitations in achieving consistent and precise damping characteristics under various external force conditions, such as becoming excessively soft in low-speed regions and excessively stiff during high-speed impacts. Particularly in environments where repetitive vibrations and sudden, large shocks exist simultaneously, such as in vehicle suspension systems or industrial equipment, it is difficult to provide appropriate damping force by adapting to changing speed and pressure conditions using only a single orifice or a single check valve. While soft damping force must be provided in the low-speed range where the piston moves slowly to maintain ride comfort and equipment stability, problems arise when sufficient damping force is not secured. When rapid displacement occurs at high speeds, internal pressure surges, causing the oil to attempt to pass through the existing single flow path quickly. This problem persists even in structures with added piped return passages, where non-linear damping characteristics occur—such as the valve remaining closed or opening excessively under certain conditions—making precise control difficult. FIG. 1 is a perspective view of a hydraulic damper according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating the compression stroke of a hydraulic damper according to an embodiment of the present invention. FIGS. 3A and FIGS. 3B are drawings for illustrating a manifold block in a compression stroke according to an embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating the rebound stroke of a hydraulic damper according to an embodiment of the present invention. FIGS. 5A and FIGS. 5B are drawings for illustrating a manifold block in a rebound stroke according to an embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating the compression stroke of a hydraulic damper according to another embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating the rebound stroke of a hydraulic damper according to an embodiment of the present invention. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the present invention, and the present invention is defined only by the scope of the claims. The terms used in this specification are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. The terms "comprises" and/or "comprising" as used in this specification do not exclude the presence or addition of one or more other components in addition to the components mentioned. Throughout the specification, the same reference numerals refer to the same components, and "and/or" includes each of the mentioned components and all combinations of one or more. Although terms such as "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical scope of the invention. Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a perspective view of a hydraulic damper according to an embodiment of the present inventio