Master Cylinder Cup Seal Inclined Assembly
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Solution Overview
Problem
The existing techniques for assembling seals in brake master cylinders are inefficient, particularly in terms of manufacturing efficiency, and face challenges when dealing with seals of small diameters and high stiffness, as they require complex deformation processes that can be difficult to execute.
Innovation Solution
A seal assembling method and apparatus that incline the cup seal with respect to the axial direction of the cylinder main body, using a center cored bar tool to define the insertion limit and an insertion jig to guide the seal into the seal groove, eliminating the need for complex deformation and allowing smooth assembly even for seals with small diameters and high stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the seal is inserted into the main body in a deformed horseshoe shape using pliers, then the seal can be disposed in the groove by releasing deformation, but the manufacturing efficiency is low
Solution Approach 1:
The cup seal is pre-formed with an inclined configuration before insertion. The insertion jig is also pre-configured with an inclined guide surface that matches the seal's inclination. This preliminary preparation eliminates the need for complex deformation operations during assembly, allowing the seal to be directly guided into the groove in its inclined state, thereby improving manufacturing efficiency while maintaining ease of installation
Solution Approach 2:
An insertion jig with an inclined guide surface is introduced as an intermediary tool. This jig facilitates the insertion process by providing a guided path that accommodates the inclined cup seal, eliminating the need for manual deformation with pliers. The intermediary jig enables efficient assembly while ensuring proper seal positioning in the groove
2Ease of manufacture
If complex deformation processes are used to insert the seal, then the seal can be installed in the groove, but the process becomes difficult to execute especially for seals with small diameters and high stiffness
Solution Approach 1:
The cup seal is pre-formed with an inclined configuration and the insertion jig is pre-configured with a matching inclined guide surface. This preliminary preparation eliminates the need for complex deformation operations during assembly, allowing direct guided insertion of the seal into the groove
Solution Approach 2:
An insertion jig with an inclined guide surface is introduced as an intermediary tool that facilitates the insertion process. The jig provides a guided path that accommodates the inclined cup seal, eliminating the need for manual deformation operations and simplifying the overall assembly process
3Productivity
If the cup seal is inserted while inclining it with respect to the axial direction using a center cored bar tool and insertion jig, then the seal can be smoothly assembled to the seal groove, but additional tools and process steps are introduced
Solution Approach 1:
The insertion jig combines multiple functions into a single tool: it provides the inclined guide surface for the cup seal, incorporates the center cored bar tool for positioning, and includes the insertion limit stop for controlling insertion depth. By merging these functions into one integrated apparatus, the patent achieves efficient inclined insertion while minimizing the number of separate tools and process steps required
Data Source
AI summary
A seal assembling method of a master cylinder for assembling a cup seal for sealing a piston slidably moving in a bottomed-tubular cylinder main body to a seal groove formed in the cylinder main body in an annular shape includes inserting the cup seal into the cylinder main body while inclining the cup seal with respect to an axial direction of the cylinder main body, and assembling the cup seal to the seal groove by moving the cup seal to the seal groove in a state that a position of a center cored bar tool for defining an insertion limit of the cup seal with respect to the cylinder main body is aligned with the seal groove.