Cup Seal Intermediate Lip Segmentation for Master Cylinder
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Solution Overview
Problem
The existing cup seals in plunger type master cylinders are stiff, making it difficult for the base portion to elastically deform and form a large liquid passage area, which limits hydraulic fluid supply and responsiveness when the piston withdraws.
Innovation Solution
A cup seal design with easy and difficult elastic deformation portions, where the intermediate lip portions are disposed alternately with predetermined intervals, allowing the base portion to easily deform and separate from the housing, forming a larger passage area and improving fluid supply and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intermediate lip portion is provided continuously over the whole periphery, then the sealing function is improved, but the base portion becomes stiff and difficult to elastically deform
Solution Approach 1:
The continuous intermediate lip portion is divided into multiple segments with gaps between them. This segmentation reduces the rib effect and allows the base portion to elastically deform more easily, resolving the contradiction between maintaining sealing function and reducing stiffness.
Solution Approach 2:
The intermediate lip portion is designed with different properties in different regions: it provides sealing contact where needed while creating gaps in other regions to allow elastic deformation of the base portion. This local differentiation resolves the contradiction between sealing reliability and base portion flexibility.
2Stability of the object's composition
If the base portion is stiff, then the structural stability is improved, but the liquid passage area is insufficient and hydraulic fluid supply is limited
Solution Approach 1:
By segmenting the intermediate lip portion, the base portion gains elastic deformability while maintaining overall structural stability. This allows the base portion to separate from the housing wall and form a larger liquid passage area, increasing hydraulic fluid supply capability.
Solution Approach 2:
The base portion is designed to dynamically change its configuration through elastic deformation. During hydraulic fluid supply, the base portion separates from the housing wall to create a larger passage area, while maintaining structural stability during normal operation.
3Manufacturing precision
If the base portion does not elastically deform, then the manufacturing precision is improved, but the responsiveness when piston withdraws is reduced
Solution Approach 1:
The segmented intermediate lip portion allows controlled elastic deformation of the base portion, enabling rapid response during piston withdrawal while maintaining manufacturing precision for the overall component dimensions and sealing surfaces.
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
The design enables effective elastic deformation of the base portion, creating a larger passage area for hydraulic fluid supply, enhancing responsiveness and hydraulic pressure generation in the master cylinder.
Implementation Method 1
the base portion includes an easy elastic deformation portion, which elastically deforms in the axial direction comparatively easily
Data Source
AI summary
A cup seal (21) of the invention includes an intermediate lip portion (21d), positioned between an inner lip portion (21b) and an outer lip portion (21c), provided in a base portion (21a). The intermediate lip portion (21d) is configured in such a way that first intermediate lip portions (21d1), communication passages (21d3), second intermediate lip portions (21d2), whose axial direction length is less than that of the first intermediate lip portions (21d1), and the communication passages (21d3), which have no lip portion, are cyclically disposed, in this order, in the peripheral direction. An easy elastic deformation portion of the base portion (21a) which elastically deforms easily is formed by the second intermediate lip portions (21d2) and communication passages (21d3) and, by the easy elastic deformation portion elastically deforming easily when supplying liquid, a flow passage with a larger passage area is formed.