Floating Disc Brake Caliper Structure for Uniform Outer Pad Pressure
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Solution Overview
Problem
The existing floating-type disc brake devices experience uneven wear and noise during braking due to locally high surface pressure at the radially outer side portion of the outer pad, caused by the cantilever structure of the outer body portion.
Innovation Solution
The floating-type disc brake device incorporates a protruding portion on the outer pad with a contact convex portion that rises axially and has a larger area facing the radially inner side half portion of the base plate, ensuring that only the distal end surface of the contact convex portion contacts the outer pad during braking, thereby distributing pressure more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a cantilever structure is used for the outer body portion to simplify the caliper body design, then device complexity is reduced, but surface pressure becomes uneven and causes local high pressure at the radially outer side portion of the outer pad
Solution Approach 1:
The invention applies local quality by making the pressing surface of the outer body portion have a specific shape that is different across its area. The pressing surface includes a radially inner side portion and a radially outer side portion with different geometries, allowing each region to compensate for the elastic deformation characteristics of the cantilever structure, thereby achieving uniform surface pressure distribution across the outer pad
Solution Approach 2:
The invention changes the geometric parameters of the pressing surface to resolve the pressure distribution issue. By carefully designing the shape parameters of the radially inner side portion and radially outer side portion of the pressing surface, the system compensates for the elastic deformation of the cantilever structure, transforming the pressure distribution from non-uniform to uniform
2Area of stationary object
If the pad pressing portion contacts the entire surface of the outer pad, then contact area is maximized, but surface pressure becomes locally high at the radially outer side portion causing uneven wear
Solution Approach 1:
The invention applies local quality by differentiating the pressing surface into distinct regions (radially inner side portion and radially outer side portion) with different geometric characteristics. This allows each region to apply pressure appropriately according to the local deformation behavior, ensuring uniform pressure distribution across the entire contact area and preventing localized high pressure that would cause uneven wear
3Ease of manufacture
If the outer body portion is designed as a simple cantilever structure, then manufacturing is simplified, but elastic deformation causes noise during braking
Solution Approach 1:
The invention changes the geometric parameters of the pressing surface to compensate for the elastic deformation of the cantilever structure. By optimizing the shape parameters of the radially inner side portion and radially outer side portion, the system reduces the impact of deformation-induced noise while maintaining the manufacturing simplicity of the cantilever structure
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 configuration effectively suppresses the local increase in surface pressure at the radially outer side portion of the outer pad, reducing the likelihood of uneven wear and noise during braking.
Implementation Method 1
a pad pressing portion 100a of an outer body portion 100 that presses an outer pad 101 produces elastic deformation to rise to a radially outer side and an axially outer side during braking
Data Source
AI summary
This floating-type disc brake device (1) is configured to comprise an inner pad (4), an outer pad (5), a support (2), and a caliper body (3). An overhanging part (32) is provided to substantially the entirety of a portion that is of an outer body part (21) constituting the caliper body (3) and that faces a substrate part (49b) of the outer pad (5) in the axial direction. An axially inner surface of the overhanging part (32) has formed thereon a projecting abutment part (33) where the area of a portion that faces a radially inner half of the substrate part (49b) in the axial direction is greater than the area of a portion that faces a radially outer half of the substrate part (49b) in the axial direction. At the time of braking, only the leading end surface of the projecting abutment part (33) is brought into contact with an axially outer surface of the substrate part (49b).