Disc Brake Elastic Return Blade Wear Compensation
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Solution Overview
Problem
In motor vehicle disc brakes, insufficient force from the rotating disc to push brake pads back to their inactive position can lead to premature wear and overheating of friction linings, causing residual torque and increased fuel consumption.
Innovation Solution
The introduction of a disc brake design featuring a blade with a plastically deformable section that takes up wear clearance, allowing for controlled movement of brake pads between active and inactive positions, ensuring consistent clearance and reducing excessive clamping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the disc pushes brake pads back to inactive position, then brake pads return to spaced position, but the pushing force is insufficient causing pads to remain in contact
Solution Approach 1:
An elastic return member is introduced as an intermediary element between the brake pad and the support. This return member actively pushes the brake pad back to its inactive position, compensating for the insufficient pushing force from the rotating disc. The elastic member deforms during braking and then restores, reliably returning the pad without continuous contact.
Solution Approach 2:
The elastic return member utilizes its own elastic deformation and recovery properties to perform the return function. During braking, the member deforms elastically storing energy, and during the return phase, it releases this energy to push the brake pad back, making the system self-servicing without requiring additional active components.
2Reliability
If brake pads remain in contact with disc, then friction lining wears prematurely, but constant friction causes overheating and residual torque
Solution Approach 1:
The elastic return member provides continuous feedback through its deformation state. It actively monitors the position of the brake pad and exerts restoring force to maintain the correct spaced position. This feedback mechanism ensures the pad returns reliably to the inactive position, preventing continuous contact and the associated wear and overheating problems.
Solution Approach 2:
The elastic return member acts as an intermediary that actively manages the clearance between the brake pad and disc. By providing this intermediate pushing force, it ensures proper spacing is maintained, preventing the harmful effects of continuous friction such as premature wear, overheating, and residual torque.
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 design prevents premature wear and overheating by maintaining a constant operating clearance, reducing fuel consumption and maintaining engine performance by ensuring proper brake pad positioning and minimizing excessive clamping force.
Implementation Method 1
the elastic return member comprising a blade comprising at least a first section of axial orientation which is elastically deformable by traction between a state of rest and a state of maximum elongation
Implementation Method 2
the blade comprising at least a second section which is plastically deformable, under the effect of an axial tensile force, forming means for taking up play for wear
Data Source
Figure 1
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Figure 5~6
AI summary
The invention relates to a motor vehicle disc brake (10) comprising: - a rotating disc (12); - a fixed support (14); - a brake pad (18) sliding in the support (14) between an active position bearing against the disc (12), and an inactive position separated by a clearance (J1) operating of the disc (12); - means (60) for elastically returning the brake pad (18) to its inactive position; characterized in that the elastic return means (60) are fixed to the support (14) by means of clearance (J2) for wear of the brake pad (18) which deform plastically when the stroke of the brake pad (18) exceeds the clearance (J1) operating.