Adjustable damping valve device for a vibration damper

The damping valve device addresses the challenge of achieving a large damping force ratio in both working directions by using a pre-stage valve with series throttle points and check valves, enhancing the damping force control and performance of vibration dampers.

DE102024202489B3Active Publication Date: 2025-07-31ZF FRIEDRICHSHAFEN AG
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Patent Information

Application Number
DE102024202489
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-03-18
Publication Date
2025-07-31
Estimated Expiration
2044-03-18

AI Technical Summary

Technical Problem

Existing damping valve devices for vibration dampers face challenges in achieving a sufficiently large damping force ratio, particularly when subjected to alternating flow directions, due to insufficient control over the damping force in both working directions.

Method used

The damping valve device incorporates a pre-stage valve with a first and second throttle point, connected in series, to control the pressure in the control chamber of the main stage valve, enhancing the damping force ratio by influencing the closing force through the pressure drop in the pre-stage valve, and utilizing check valves to prevent hydraulic short circuits.

Benefits of technology

This configuration allows for a differentiated damping force characteristic in both working directions, ensuring a robust damping force ratio by controlling the closing force effectively, thereby improving the performance of the vibration damper.

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Abstract

Adjustable damping valve device for a vibration damper, comprising a damping valve housing in which a pre-stage valve for hydraulically controlling a main stage valve is arranged, wherein the damping valve housing is hydraulically connected to a piston rod-side and a piston rod-remote working chamber of a working cylinder of the vibration damper, wherein the damping valve device has a check valve arrangement for rectifying a control volume flow from the working chambers of the working cylinder to the pre-stage valve, wherein a first flow connection from the piston rod-side working chamber to the pre-stage valve has a greater throttle resistance than a second flow connection from the piston rod-remote working chamber to the pre-stage valve.
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Claims

[1] Adjustable damping valve device (1) for a vibration damper (3), comprising a damping valve housing (5) in which a pre-stage valve (19) for hydraulically controlling a main stage valve (23) is arranged, wherein the damping valve housing (5) is hydraulically connected to a piston rod-side and a piston rod-remote working chamber (25; 27) of a working cylinder (9) of the vibration damper (3), wherein the damping valve device (1) has a check valve arrangement for rectifying a control volume flow from the working chambers (25; 27) of the working cylinder (9) to the pre-stage valve (19), characterized byin that a first flow connection (57) from the working chamber (25) on the piston rod side to the pre-stage valve (19) has a greater throttle resistance than a second flow connection (68) from the working chamber (27) remote from the piston rod to the pre-stage valve (19), in that the first flow connection (57) comprises a first throttle point (47) and, hydraulically in series, a second throttle point (53), wherein the second flow connection (68) has a check valve chamber (59) which is connected upstream of the throttle (64) of the second flow connection (68) and which accommodates at least one check valve disc (69S) which interacts with at least one inflow channel (63). [2] Adjustable damping valve device (1) according to claim 1, characterized by that the first and the second flow connection (57; 68) open into a common control chamber (61) of the pre-stage valve (19). [3] Adjustable damping valve device (1) according to at least one of claims 1 or 2, characterized by that a hydraulic connection between the two working chambers (25; 27) via the first and the second flow connection (57; 68) is blocked by the check valve arrangement (47; 67; 64; 69). [4] Adjustable damping valve device (1) according to at least one of claims 1 to 3, characterized by that both flow connections (57; 68) are designed within the main stage valve body (37).

Citation Information

Patent Citations

  • Adjustable damping valve device for a vibration damper

    DE102015218292A1

  • shock absorbers to dampen movements

    DE3835705A1

  • Variable damper for vehicle suspension strut

    DE4418972A1