Disc Brake Pad Guideway With Elastic Damping Wing
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Solution Overview
Problem
Motor vehicle disc brakes experience noise due to vibrations between the brake pad and clevis, despite the use of spring-damped slideways, as the friction coefficients between the pad and slide are uneven, leading to residual contact and friction losses.
Innovation Solution
A slider with an elastic damping wing and a fold, made from a sheet covered with damping material on one face, ensures consistent friction coefficients across contact zones by positioning the damping face opposite a bearing zone on the pad, reducing contact with the skate and using a rounded contact zone to enhance friction with the shoe, and is fixed to the yoke with interlocking wings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a slide with damping spring is provided between the lug and housing to absorb shock, then noise attenuation is improved, but the friction coefficient becomes uneven causing residual contact and friction losses
Solution Approach 1:
The slide is designed with differentiated contact surfaces: one surface has damping material applied for high-friction contact with the pad, while other surfaces remain smooth metal for low-friction contact with the housing. This local quality differentiation ensures that damping occurs where needed (pad contact) while minimizing friction losses in guiding surfaces (housing contact).
Solution Approach 2:
The slide structure segments the friction interfaces into distinct zones: the damping material contact zone with the pad and the smooth metal contact zones with the housing. This segmentation allows independent optimization of each interface - high friction for damping where required, low friction for guiding where required.
2Ease of operation
If the pad is allowed to slide freely in the slideway, then sliding smoothness is improved, but vibration noise occurs due to uneven friction coefficients
Solution Approach 1:
The slide provides free sliding through smooth metal surfaces in the housing contact zones, while introducing controlled damping through localized damping material application in the pad contact zone. This creates different local qualities - smooth for friction reduction in guiding areas, and damped for vibration control in loading areas.
Solution Approach 2:
The damping material acts as an intermediary layer between the pad and the slide, mediating the interaction by providing consistent friction characteristics. This intermediary prevents direct metal-to-metal contact with uneven friction coefficients, thereby reducing vibration noise while maintaining sliding smoothness.
3Object-affected harmful factors
If damping material is applied on all faces of the slide, then vibration damping is improved, but the coefficient of friction becomes too high causing increased friction losses
Solution Approach 1:
Damping material is applied selectively only on the face that contacts the pad, while other faces contacting the housing remain as smooth metal. This local quality approach ensures vibration damping is provided where needed (pad interface) without introducing excessive friction in the guiding interfaces (housing interface).
Solution Approach 2:
The damping material application is segmented to specific contact zones rather than covering the entire slide surface. This segmentation allows the system to achieve vibration damping benefits from the damping material while maintaining low friction characteristics in the housing contact zones through exposed smooth metal surfaces.
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 and vibrations by maintaining consistent friction coefficients, improving braking sensitivity and reducing residual torque, while ensuring smooth sliding and minimizing friction losses.
Implementation Method 1
the damping is obtained by the deformation of a spring formed by a wing of the slide whose shape is adapted to the force exerted by the brake pad during its tangential movement
Implementation Method 2
To absorb the shock of the lugs in their housing and thus attenuate the noise, a slide is provided between each lug and its housing
Implementation Method 3
brake pads secured to the chassis of the vehicle which come by friction to brake the disc
Data Source
AI summary
Guideway for a motor vehicle disc brake which comprises at least one brake pad (5) which is slidably mounted in at least one guideway (7) with respect to a brake disc (8) along an axially oriented axis of sliding and comprises at least one brake pad application element (4) which is able to act axially; of the type in which the guideway (7), which is fixed to a fixed carrier (3) comprising an elastically deformable leg (10) and a guide face (11) comprising a contact zone, the brake pad (5) exerting a constant elastic force F and comprising elastic damping means on all the face of the guideway likely to be in contact with the carrier and made from a sheet metal covered with said damping means on just one of its faces, characterized in that the damping face comprises zones of contact with the carrier (3) and the guideway (7) and in that said guideway comprises an elastic leg (10) in contact with the pad (5) and has a bent-over portion (11) so that the face comprising the damping means (13) is opposite to a zone for pressing against the pad (5).