Brake Caliper Pad Pin Assembly With Elastic Axial Stop
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Solution Overview
Problem
The manufacturing of pad supporting pins for brake calipers is complex and costly due to the need for precise machining of pin abutment portions, which also complicates assembly and maintenance, and there is a need to standardize pin geometry for different caliper types.
Innovation Solution
A caliper body and pin assembly with a cylindrical-tubular-shaped elastic element that forms a radial seal and axial abutment, eliminating the need for complex pin body abutments and allowing for simplified machining and standardization of pin geometry, enabling easier assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex pin abutment portions are machined to ensure axial constraint and positioning, then reliability of pin retention is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the abutment function from the pin body and relocates it to the elastic element. The pin body is simplified to a uniform cylindrical shape without complex abutment portions, while the elastic element is designed with an abutment portion that engages with the caliper body to provide axial constraint and positioning.
Solution Approach 2:
The elastic element serves as an intermediary between the pin body and the caliper body. It provides both the axial constraint through its abutment portion and the radial sealing function, eliminating the need for complex direct engagement features between the pin and caliper body.
2Manufacturing precision
If precise machining of pin abutment portions is performed to achieve correct axial positioning, then positioning precision is improved, but manufacturing time and cost increase
Solution Approach 1:
The axial positioning function is extracted from the pin body machining operations and transferred to the elastic element design. The pin body can be manufactured with simple cylindrical geometry using basic turning operations, while the axial positioning is achieved through the elastic element's abutment portion that engages with a shoulder in the caliper body housing.
Solution Approach 2:
The patent changes the design parameter from complex pin geometry with precision-machined abutments to a simplified pin geometry where the elastic element provides the positioning function. This parameter change allows the use of less precise and faster machining operations for the pin body while maintaining axial positioning precision through the elastic element-caliper body interface.
3Ease of manufacture
If standardized pin geometry is implemented across different caliper types, then ease of manufacture and inventory management are improved, but adaptability to different caliper configurations may be reduced
Solution Approach 1:
The pin body is designed as a universal standardized component with uniform cylindrical geometry that can be used across different caliper types. The adaptability to different caliper configurations is achieved through the elastic element, which can be varied in dimensions and properties to suit different caliper body housing requirements, while the pin body remains standardized.
Solution Approach 2:
The pin assembly is segmented into two independent components: a standardized pin body and a configurable elastic element. This segmentation allows the pin body to be manufactured once to a standard specification for use in multiple caliper types, while the elastic element can be customized for each specific application to ensure proper fit and function.
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 solution simplifies the machining of supporting pins, reduces manufacturing costs, and standardizes pin geometry across different caliper types, facilitating easier assembly and maintenance while maintaining effective axial constraint and radial sealing.
Implementation Method 1
the expanding elastic element is constrained by friction to the caliper body housing
Implementation Method 2
the expanding elastic element is radially compressed by the walls of the caliper body housing in the direction of the supporting pin
Data Source
AI summary
A caliper body, pin and an elastic element assembly having a caliper body, a brake pad supporting pin, and an elastic element is provided. The elastic element is fitted on the brake pad supporting pin. The brake pad supporting pin has portions that can be accommodated in a caliper body first housing and in a caliper body second housing made in the caliper body without interfering in an axial direction with surfaces of the caliper body having an extension in a radial direction. The elastic element is accommodated in a first housing first portion of the caliper body first housing. The elastic element abuts against a first housing abutment portion to define a limit stop of the brake pad supporting pin in the caliper body.