Caliper Slide Mechanism Variable Guide for Brake Noise Reduction
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Solution Overview
Problem
Conventional pin slide type disc brake devices experience noise issues due to the lack of effective noise reduction mechanisms, particularly in the caliper slide mechanism.
Innovation Solution
A disc brake device with a caliper slide mechanism that incorporates a variable mechanism allowing the permissible swing angle of the slide pin to change in response to braking actions, featuring a guide section with adjustable support parts and a hydraulic pressure chamber to optimize noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slide pin is fixed with a rigid guide structure, then the caliper is stably supported, but noise (rattle and moan) increases due to insufficient swing freedom
Solution Approach 1:
The guide structure transitions from a fixed rigid configuration to a dynamic variable guide length structure. The guide length is adjusted based on braking conditions: extended during non-braking to permit swing freedom and reduce noise, and shortened during braking to provide stable support. This dynamic adaptation resolves the contradiction between stability and noise reduction.
Solution Approach 2:
The guide length parameter is changed in response to braking conditions. By varying the guide length between two support parts of the guide section, the system optimizes the balance between caliper support stability and noise reduction. The parameter change is achieved through hydraulic pressure acting on the moving element.
2Object-generated harmful factors
If the guide length between support parts is increased, then the slide pin swing freedom is enhanced reducing noise, but the caliper support stability decreases
Solution Approach 1:
The guide length is made dynamic rather than static. The moving element allows the guide length to vary between extended and retracted positions based on braking conditions, enabling the system to optimize both noise reduction and stability at different operational states.
Solution Approach 2:
The guide length alternates between extended and retracted states in response to periodic braking actions. During non-braking periods, the guide is extended for noise reduction; during braking periods, it retracts for stability. This periodic adaptation resolves the contradiction.
3Object-generated harmful factors
If a variable mechanism is added to adjust guide length, then noise is reduced through dynamic adaptation, but the device complexity increases
Solution Approach 1:
Hydraulic pressure from the brake system is utilized to actuate the moving element and adjust the guide length. This approach leverages existing hydraulic infrastructure in the brake system, avoiding the need for separate actuators or complex control mechanisms, thus minimizing the increase in device complexity.
Solution Approach 2:
The hydraulic pressure chamber serves multiple functions: it acts as both the braking force transmission medium and the actuation mechanism for the variable guide length. This multi-functionality reduces the need for additional components and simplifies the overall system.
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 solution effectively reduces noise by increasing the permissible swing angle during braking and adjusting the guide length between support parts, thereby minimizing rattle and moan noises simultaneously.
Implementation Method 1
a variable mechanism pressure chamber which is supplied with a hydraulic medium and generates force to make the variable mechanism moving element approach the other of the two support parts
Implementation Method 2
a elastic member which is interposed between the slide pin and the sleeve and is capable of compressive deformation in a braking state
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A disc brake device (1) includes: a disc rotor (2) rotating around a rotational axial line; a friction pad (4) facing a friction surface of the disc rotor (2); a caliper (5) capable of pressing the friction pad (4) to the friction surface of the disc rotor (2); a mounting (6) provided with the caliper (5); and a caliper slide mechanism (7) supporting the caliper (5) on the mounting (6) in a manner enabling slide movement via a slide pin (71) inserted in a guide section (75) provided in a hole section (62) of the caliper (5) or the mounting (6), in which the caliper slide mechanism (7) has a variable mechanism (74) making a permissible swing angle of the slide pin (71) with respect to a slide movement direction variable in response to a braking action along with slide movement of the caliper (5). Accordingly, the disc brake device (1) and the caliper slide mechanism (7) can provide an effect of reducing noises.