Disc Brake Elastic Return Mechanism for Pad Detachment
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Solution Overview
Problem
Conventional motor vehicle disc brakes experience unnecessary wear and energy consumption due to the brake pad remaining glued to the disc when the caliper returns to its rest position, especially at reduced speeds, causing noise and inefficiency.
Innovation Solution
The brake pad is elastically biased towards its rest position using a slideway with radially inclined guide wings, ensuring it remains detached from the disc when the caliper is not clamping, utilizing a piston and caliper nose for constant contact and controlled movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the brake pad is allowed to slide freely in the slideway without elastic biasing means, then the device complexity is reduced and manufacturing is easier, but the brake pad remains glued to the disc at reduced speeds causing unnecessary wear, energy consumption, and noise
Solution Approach 1:
The patent introduces elastic biasing means that modify the friction parameter between the brake pad and disc by applying a controlled elastic force. This changes the normal force parameter, creating sufficient friction to prevent gluing at reduced speeds while maintaining the ability to slide freely during normal operation. The elastic force parameter is tuned to activate only when needed.
Solution Approach 2:
The elastic biasing means acts as an intermediary element between the brake pad and the slideway. This intermediary applies a controlled elastic force that prevents the brake pad from remaining glued to the disc, mediating the interaction between the pad and disc surfaces without requiring complex mechanical constraints.
2Device complexity
If the brake pad is allowed to slide freely in the slideway without elastic biasing means, then the device complexity is reduced, but energy consumption increases due to overconsumption to counter frictional force
Solution Approach 1:
The elastic biasing means modifies the friction parameter by controlling the normal force between brake pad and disc. By adjusting the elastic force parameter, the system achieves optimal friction levels that prevent gluing without requiring excessive energy to counteract friction, thus reducing overall energy consumption.
Solution Approach 2:
The elastic biasing means is a passive element that automatically adjusts the brake pad position based on operating conditions. It self-regulates the friction force without requiring active control systems, reducing device complexity while preventing energy-wasting gluing phenomena through inherent elastic properties.
3Device complexity
If the brake pad is allowed to slide freely in the slideway without elastic biasing means, then the structure is simpler, but noise is generated due to vibrations of the pad rubbing against the disc
Solution Approach 1:
The elastic biasing means changes the contact parameter between brake pad and disc by applying controlled elastic force. This parameter modification prevents violent vibrations and gluing phenomena that generate noise, creating a more stable contact condition without requiring complex noise-damping structures.
Solution Approach 2:
The elastic biasing means serves as a mediator that smooths the interaction between brake pad and disc. By introducing this intermediary elastic element, the system prevents direct rigid contact that causes vibrations and noise, while maintaining the simplicity of the overall structure.
4Loss of substance
If elastic biasing means are introduced to prevent gluing, then wear and noise are reduced, but the device complexity increases
Solution Approach 1:
The elastic biasing means is introduced as a simple intermediary element between the brake pad and slideway. This single intermediate component prevents gluing and reduces wear without requiring complex mechanisms, maintaining relatively low device complexity while achieving the desired protective function.
Solution Approach 2:
The elastic biasing means is a self-regulating passive element that automatically adjusts brake pad position based on operating conditions. This self-service capability eliminates the need for complex active control systems, reducing device complexity while effectively preventing wear through automatic friction control.
5Use of energy by moving object
If elastic biasing means are introduced to prevent gluing, then energy consumption is reduced, but the device complexity increases
Solution Approach 1:
The elastic biasing means modifies the friction parameter by controlling normal force, optimizing the balance between preventing gluing and minimizing frictional energy loss. This parameter optimization reduces energy consumption without requiring complex active control systems to manage energy efficiency.
Solution Approach 2:
The elastic biasing means automatically adjusts friction conditions based on operating parameters, self-regulating to prevent energy-wasting gluing phenomena. This passive self-service mechanism reduces energy consumption without requiring complex active control systems or sensors.
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 solution prevents unnecessary wear and noise by ensuring the brake pad is immediately detached from the disc when the caliper is not clamping, reducing energy consumption and maintaining smooth operation at reduced speeds.
Implementation Method 1
a first elastically deformable wing which comprises a guide face comprising a zone of contact with a guide lug of the brake pad and which exerts a constant elastic force of pinching
Implementation Method 2
the leaf springs are intended to reduce the vibrations which exist between the brake pad and the yoke by allowing a certain freedom of transverse and radial movement of the brake pad with respect to the yoke
Implementation Method 3
a brake pad which is mounted to slide relative to a brake disc along a sliding axis of axial orientation
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The brake has a brake shoe slidingly mounted with respect to a brake disc along an axial sliding orientation axis in a slider (22) e.g. leaf spring, between front braking and back rest positions. The slider has a radial orientation web (24) arranged near a radial orientation face of a clevis. An axial edge (45) of a rib (44) of a lower guiding wing (26) is radially inclined relative to an axial sliding direction of the shoe such that total toe-in force is exerted by the guiding wing on a lug, where an axial return component (F1a) of the force is directed toward the back.