Front Fork Design for Enhanced Damping and Stability
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Summary
Problems
Existing front fork systems for motorcycles experience variations in pressure balance and friction with piston speed, leading to deteriorated riding comfort and driving stability due to inadequate damping force feeling and limited adjustability.
Innovation solutions
A front fork design featuring coaxial cylindrical tubes with a damping force generating portion that includes two resistance-generating components in series, an intermediate oil chamber, and a pressurization portion with a reservoir chamber, allowing for stable damping force generation and easy adjustment through bypass flow paths and valves.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a single damping force generating portion is used in the inner tube, then the structure is simple, but the range of damping force adjustment is limited and the feeling of damping force is insufficient
Why choose this principle:
The damping force generating portion is divided into a first damping force generating portion and a second damping force generating portion disposed in series. Each portion can independently generate damping force, allowing for a wider adjustment range and better damping control. The segmentation enables each component to be optimized independently while working together to provide comprehensive damping coverage.
Principle concept:
If a single damping force generating portion is used in the inner tube, then the structure is simple, but the range of damping force adjustment is limited and the feeling of damping force is insufficient
Why choose this principle:
The invention introduces an external flow path that circulates working oil outside the inner tube, creating a parallel damping mechanism. This dimensional change from internal-only flow paths to external circulation enables additional damping force generation without interfering with the internal piston movement, thereby expanding the adjustment range.
Application Domain
Data Source
AI summary:
A front fork design featuring coaxial cylindrical tubes with a damping force generating portion that includes two resistance-generating components in series, an intermediate oil chamber, and a pressurization portion with a reservoir chamber, allowing for stable damping force generation and easy adjustment through bypass flow paths and valves.
Abstract
A front fork includes an inner cylinder disposed inside an inner tube, a piston rod moving with an outer tube, a piston attached to a lower end portion of the piston rod and sectioning an oil chamber in the inner cylinder into a lower oil chamber and an upper oil chamber and a damping force generating portion at an outside of the inner tube having a first damping force generating portion generating resistance in working oil flowing in one direction in an external flow path, a second damping force generating portion disposed in series with the first damping force generating portion in the external flow path to generate resistance in working oil flowing in the other direction, and a pressurization portion having an oil reservoir chamber communicated to an intermediate oil chamber and pressurizing working oil in the intermediate oil chamber.