Disc Brake Caliper Positioning Mechanism for Wear Compensation
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Solution Overview
Problem
Conventional disc brake devices face issues with stable retraction due to pad wear, leading to increased caliper movement stroke and potential dragging, especially under high fluid pressure, which affects the caliper's ability to return properly.
Innovation Solution
A disc brake device with a positioning mechanism that adjusts the relative position of the slide pin and sleeve based on pad wear, utilizing an elastic member and movable element to define the maximum compression deformation, ensuring stable retraction by changing the caliper's position accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the caliper is supported to be freely movable by the mounting bracket through a slide mechanism, then the caliper can move forward to push the pads against the disc rotor during braking, but the caliper cannot be sufficiently moved backward by the elastic restoring force of the retraction seal when the pad wears and the movement stroke increases
Solution Approach 1:
The invention introduces a positioning mechanism that dynamically adjusts the relative position of the slide pin and sleeve based on pad wear. The movable element can shift position to compensate for increased caliper movement stroke, ensuring the retraction seal maintains effective engagement and continues to provide sufficient retraction force throughout the pad's service life.
Solution Approach 2:
The positioning mechanism changes the geometric parameters of the slide mechanism by allowing relative movement between the slide pin and sleeve. This adjustment modifies the effective length and positioning of the retraction seal, adapting the system to accommodate pad wear and maintain reliable retraction functionality.
2Force
If high fluid pressure is input to the piston during braking, then the braking force is increased, but the retractor amount becomes small causing dragging
Solution Approach 1:
The positioning mechanism dynamically compensates for the reduced retraction effect caused by high fluid pressure. By adjusting the relative position of the slide pin and sleeve, the system optimizes the retraction seal's engagement and ensures adequate retraction amount even when high braking forces are applied, preventing dragging.
3Reliability
If the retraction seal is interposed between the slide pin and the caliper arm to provide elastic restoring force, then the caliper can return during depressurization, but the retraction seal compresses and deforms during braking reducing its effectiveness
Solution Approach 1:
The movable element acts as an intermediary between the slide pin and the retraction seal. It transmits and regulates the force applied to the retraction seal, preventing excessive compression and deformation during braking while ensuring the seal maintains its elastic restoring force for effective retraction during depressurization.
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 device ensures stable retraction and prevents dragging by adjusting the caliper's position according to pad wear, maintaining consistent retraction functionality even under varying fluid pressures.
Implementation Method 1
the caliper returns to the state before the movement by the elastic restoring force of the retraction seal at the time of depressurization after the braking
Data Source
AI summary
A disc brake device is configured to include friction pads facing the friction surface of a disc rotor, a caliper and a piston capable of pushing the friction pads against the friction surface of the disc rotor, and a mounting for supporting the caliper in a freely movable manner to a vehicle body side through a slide mechanism including a slide pin and a sleeve. A positioning mechanism capable of changing a relative position of the slide pin and the sleeve is arranged to appropriately change the position of the caliper according to the wear of the pad and ensure stable retract function.