Shock Absorber Bypass Lock Structure for Stroke-End Damping
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Solution Overview
Problem
Existing shock absorbers face limitations in increasing compression side damping force near the stroke end, as the gas chamber pressure cannot be elevated to match the compression side chamber pressure, and manual adjustment of needle valves is insufficient for enhancing damping force at maximum contraction.
Innovation Solution
The shock absorber incorporates a sub-cylinder with a hydraulic pressure lock chamber and compensation chamber, featuring a lock piece and closing body that increase hydraulic pressure during contraction, along with a bypass passage and damping force adjustment valve to enhance damping force near the stroke end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the compression side chamber pressure is increased to generate larger compression side damping force, then the damping force near stroke end is improved, but the pressure cannot exceed the gas chamber pressure limit in traditional structures
Solution Approach 1:
The invention divides the compression side chamber into two separate chambers: a first compression side chamber that communicates with the gas chamber and a second compression side chamber that does not communicate with the gas chamber. This segmentation allows the second chamber to achieve pressures exceeding the gas chamber pressure, thereby generating larger compression side damping force near the stroke end without being limited by the gas chamber pressure.
Solution Approach 2:
The invention introduces a bypass passage as an intermediary pathway that allows hydraulic oil to flow from the first compression side chamber to the second compression side chamber. This bypass passage enables pressure buildup in the second chamber beyond the gas chamber pressure limit, facilitating enhanced damping force generation while maintaining system integrity.
2Ease of operation
If manual adjustment of the needle valve is performed to increase damping force, then the damping force adjustment is possible, but the adjustment is insufficient for enhancing damping force at maximum contraction
Solution Approach 1:
The invention replaces the static manual needle valve adjustment with a dynamic bypass passage mechanism that automatically adjusts damping force based on piston position. The bypass passage enables progressive damping force increase during compression stroke, automatically providing maximum damping force near the stroke end without requiring manual intervention or complex adjustment mechanisms.
3Adaptability or versatility
If the bypass passage is used to allow communication between extension side chamber and compression side chamber, then the damping force adjustment is enabled, but the pressure increase needed for large damping force at stroke end is limited
Solution Approach 1:
The invention segments the compression side chamber into two distinct chambers with different communication characteristics. The first compression side chamber communicates with the gas chamber through the piston, while the second compression side chamber is isolated from the gas chamber. This segmentation allows the second chamber to build pressure beyond the gas chamber pressure limit, overcoming the pressure limitation of the traditional single-chamber bypass design.
Solution Approach 2:
The bypass passage serves as an intermediary that selectively connects the first and second compression side chambers. This intermediary pathway allows hydraulic oil to transfer from the first chamber to the second chamber, enabling pressure buildup in the second chamber beyond the gas chamber pressure limit while maintaining the benefits of bypass functionality for damping force adjustment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for the generation of a large damping force during contraction by increasing hydraulic pressure, overcoming the limitations of traditional shock absorbers and providing adjustable damping forces throughout the stroke.
Implementation Method 1
a hydraulic pressure lock chamber (L) in which a liquid is sealed
Implementation Method 2
a gas chamber (G) and a liquid chamber (A) communicating with the compression side chamber (R2)
Data Source
Figure 1
AI summary
A shock absorber (D) includes: a cylinder (1); a piston rod (2); a piston (3) that partitions the inside of the cylinder (1) into an extension side chamber (R1) and a compression side chamber (R2); a bypass passage (40) provided in the piston rod (2) and bypassing an extension side damping valve (7) and a compression side damping valve (8); a damping force adjustment valve (41); a sub-cylinder (4) that is housed in the compression side chamber (R2) and forms a hydraulic pressure lock chamber (L) and a compensation chamber (R); a lock piece (31); and a closing body (6), in which the compensation chamber (R) includes a gas chamber (G) and a liquid chamber (A) communicating with the compression side chamber (R2), the bypass passage (40) includes a longitudinal hole (2d), and the closing body (6) closes an opening of the longitudinal hole (2d).