Disk Brake Transmission Member Anti-Rotation Locking
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Solution Overview
Problem
In disk brake manufacturing, the anti-rotation locking between the transmission member and the cylinder is often released due to air pressure in the cam chamber, causing a phase shift and reducing fabrication efficiency, especially when incorporating subsequent components like the piston.
Innovation Solution
The anti-rotation locking portions on the transmission member are fitted into the axial grooves on the cylinder before the sealing member is inserted, ensuring the locking mechanism remains engaged even when the cam chamber is sealed, preventing the release of the anti-rotation fitting and guiding the sealing member's insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cam chamber is sealed with a seal provided to the transmission member at the time of incorporation, then the cam chamber is hermetically sealed, but the anti-rotation locking fitting is released due to air pressure in the cam chamber
Solution Approach 1:
The anti-rotation locking portion is fitted into the fitting area before the sealing member is installed. This preliminary locking action ensures that the transmission member maintains its rotational position relative to the cylinder before the cam chamber is sealed, preventing phase shift issues that would occur if locking were attempted after sealing.
Solution Approach 2:
The transmission member is divided into functional segments: an anti-rotation locking portion for rotational constraint, a sealing member for hermetic sealing, and other functional components. This segmentation allows the locking and sealing operations to be performed in separate, optimized sequences without interfering with each other.
2Ease of manufacture
If the transmission member is pressed in temporarily during assembly, then incorporation is facilitated, but air pressure causes the transmission member to return and release the anti-rotation locking
Solution Approach 1:
The anti-rotation locking portion is engaged in the fitting area before the sealing member is installed and before the transmission member is fully pressed in. This preliminary engagement maintains precise phase alignment even when the transmission member is temporarily pressed in or returns due to air pressure, as the locking portion prevents rotational displacement.
Solution Approach 2:
The anti-rotation locking portion provides preliminary anti-action against rotational displacement caused by air pressure. By engaging the locking portion before pressure equalization occurs, the system prevents the phase shift that would otherwise occur when the transmission member returns to the cylinder opening side.
3Productivity
If another member is incorporated after the transmission member, then complete assembly is achieved, but fabrication efficiency is lowered due to potential fitting release and phase shift
Solution Approach 1:
The anti-rotation locking portion is engaged before the sealing member is installed, establishing a stable rotational reference. This preliminary locking ensures that subsequent incorporation of other members (such as the piston) can proceed without concern for phase shifts, thereby maintaining high fabrication efficiency while ensuring reliable fitting engagement throughout the assembly process.
Data Source
AI summary
A disk brake capable of improving fabrication efficiency and having a transmission member. The transmission member (101) includes: an anti-rotation locking portion (130) formed on an outer circumferential portion of the transmission member, the anti-rotation locking portion being slidably fitted into a fitting area (72) on a cylinder (35) side so as to restrict rotation relative to the cylinder; and a seal groove (109) formed in an inserted portion (105). The seal groove stores a sealing member (118) for defining an internal space in the cylinder (35) and a cam chamber (62). The anti-rotation locking portion is fitted into the fitting area (72) on the cylinder side before the sealing member is positioned inside a hole (59) when the inserted portion (105) of the transmission member (101) is inserted into the hole.