Brake Caliper Pad Retraction to Prevent Residual Braking Torque
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Solution Overview
Problem
Existing brake calipers face issues with residual braking torque generation due to pad contact with the disc after braking, leading to noise, fuel consumption, and performance reduction, which current solutions like piston retraction and springs fail to adequately address due to complexity and reliability concerns.
Innovation Solution
A brake caliper design featuring a retraction device with inclined pad surfaces and a movable working portion that guides the pad outside the tapered space, allowing controlled retraction orthogonal to the axial direction, separate from the thrust device, to prevent residual torque and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is arranged to constantly bias the pads away from the brake disc, then residual braking torque is prevented, but construction complexity increases
Solution Approach 1:
The patent extracts the harmful residual contact between pad and disc by introducing a retraction device that actively moves the pad away from the disc after braking. This separates the braking function from the retraction function, eliminating the need for continuous spring biasing while preventing residual torque.
Solution Approach 2:
The retraction device transforms the static pad position into a dynamic one, where the pad can actively retract after braking. This dynamic adjustment allows the system to adapt to different braking states without requiring complex continuous biasing mechanisms.
2Object-affected harmful factors
If the pad is retracted significantly from the braking surface, then residual torque and noise are reduced, but braking responsiveness decreases
Solution Approach 1:
The retraction device applies partial retraction - just enough to eliminate residual contact and noise, but not so much as to compromise braking responsiveness. This controlled partial action optimizes both noise reduction and braking performance.
Solution Approach 2:
The retraction device automatically adjusts pad position based on braking state, retracting only when necessary. This self-regulating mechanism ensures optimal pad positioning without requiring external control input, maintaining responsiveness while eliminating residual effects.
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
Effectively prevents residual braking torque, reduces noise and fuel consumption, maintains pad proximity to the disc, and ensures reliable retraction without excessive movement, enhancing braking performance and user responsiveness.
Implementation Method 1
a retraction device (4) of the brake pad (3) from a braking disc (5)... a working portion (16, 17) pressed in abutment on the retraction surface (14), slidably along the latter, to retract the brake pad (3)
Data Source
AI summary
A brake caliper for a disc brake having a caliper body, a brake pad and at least one retraction device of the brake pad from a braking disc is described. The device is configured to retract the brake pad from at least one of opposite braking surfaces delimited by the braking disc. The caliper body delimits a first pad abutment surface to delimit a tapered space with the braking surface of the braking disc, the first pad abutment surface being oriented so that, during the braking action, the surface guides the brake pad wedging in the tapered space. The brake pad delimits a retraction surface, inclined in a non-orthogonal direction with respect to the pad plane and oriented so that, during the retraction action, the brake pad is guided partially outside of the tapered space.