Disc Brake Pad Spreading Mechanism to Eliminate Residual Grinding
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Solution Overview
Problem
Disc brakes in commercial vehicles often fail to sufficiently separate the brake pads from the brake disc after the brake is relieved, leading to residual grinding torque due to static friction, which causes one or both pads to rub against the disc.
Innovation Solution
A spreading device supported by hold-down springs is used to lift the brake pads away from the disc, counteracting static friction and utilizing external influences like shocks and vibrations for centering, ensuring equal clearance on both sides and reducing residual grinding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake is released, then the brake pads should separate from the brake disc, but static friction prevents sufficient separation causing residual grinding torque
Solution Approach 1:
The spreading device applies a preliminary separating force to the brake pads before the braking force is completely released. This preliminary anti-action counteracts the static friction that would otherwise prevent the pads from lifting off the disc, ensuring complete separation and eliminating residual grinding torque.
Solution Approach 2:
The spreading device acts as an intermediary mechanism between the brake pads and the disc. It provides an additional separating force that mediates the interaction between the pads and disc during the release phase, ensuring sufficient clearance is established even when the primary braking force is being reduced.
2Object-generated harmful factors
If a spreading device is introduced to lift brake pads, then residual grinding is reduced, but device complexity increases
Solution Approach 1:
The spreading device is integrated with the existing brake caliper structure, merging the spreading function with the holding device of the brake pads. This combination allows the spreading mechanism to be implemented without adding completely separate components, thereby reducing the increase in device complexity.
Solution Approach 2:
The spreading device is designed to perform multiple functions: it spreads the brake pads during release to eliminate grinding, and can be integrated with the holding device structure. This multi-functionality reduces the need for additional dedicated components, minimizing the increase in overall device complexity.
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 eliminates residual grinding by ensuring both brake pads lift off the disc, maintaining reliable operation without affecting the braking process and allowing for adjustable spreading forces to accommodate different operating conditions.
Implementation Method 1
The invention is based on the understanding that spreading the two brake pads causes both pads to lift off the brake disc, thus eliminating residual rubbing. The spreading mechanism is supported by a retaining spring for the first and second brake pads.
Implementation Method 2
According to a further preferred embodiment of the invention, the spreading device can comprise a spring wire. This solution is mechanically particularly simple and robust.
Implementation Method 3
The spreading device has two helical springs. Such a helical spring can generate the aforementioned elastic restoring force under load, for example in the form of axial compression.
Implementation Method 4
External influences, such as shocks and vibrations, support the spreading effect and center the brake pads.
Data Source
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AI summary
The invention relates to a disc brake, in particular for utility vehicles, comprising a brake disc (13), a first brake lining (14) on a first side of the brake disc (13) and a second brake lining (16) on a second side of the brake disc (13), which is opposite the first side. According to the invention, a spreading device (28, 30, 42, 44, 48, 50) is provided, which generates a force for moving the first (14) and the second (16) brake lining away from each other.