Brake Hold-Down Projection Prevents Radial Rebound
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Disc brakes in commercial vehicles face issues with the hold-down spring and pressure device moving relative to each other in the tangential direction, leading to potential loss of contact and impairment under extreme conditions like radial vibrations, which can cause the spring to lift off and fail to maintain the initial position.
Innovation Solution
The hold-down device is designed with a projection that engages behind the hold-down device, limiting its radial movement and preventing rebound, while allowing axial movement, with the projection protruding beyond the through-opening in the axial direction to ensure reliable contact, and the attachment is twisted or angled to prevent tilting and jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hold-down device is designed with elongated through-openings to allow lateral mobility, then the spring can follow axial movement of the pressure device, but the pressure device can carry out lateral movements against the elastic restoring force leading to loss of contact under extreme conditions
Solution Approach 1:
The attachment is designed to protrude beyond the through-opening in the axial direction (perpendicular dimension) rather than constraining only in the lateral direction. This dimensional extension prevents radial rebound while preserving tangential mobility, as the projection engages behind the hold-down device to limit radial movement without interfering with lateral motion.
Solution Approach 2:
The hold-down device has different constraint characteristics in different directions: the through-opening allows free lateral (tangential) movement, while the projection protruding in the axial direction provides localized constraint against radial rebound. This directional differentiation of constraint quality resolves the contradiction between mobility and stability.
2Reliability
If the attachment extends beyond the through-opening in the axial direction, then radial rebound is limited, but the device complexity increases
Solution Approach 1:
The projection is integrated as part of the attachment structure rather than being a separate component. The attachment serves dual purposes: it connects the pressure device to the hold-down device through the through-opening while simultaneously protruding to limit radial rebound. This merging eliminates the need for additional separate restraint components.
Solution Approach 2:
The attachment structure performs multiple functions: it provides lateral mobility through the elongated through-opening, maintains axial connection, and limits radial rebound through the protruding projection. This multi-functionality reduces the need for separate components and simplifies the overall device structure.
3Ease of operation
If the projection is twisted or angled, then tilting and jamming are prevented, but manufacturing precision requirements increase
Solution Approach 1:
The projection is designed with an asymmetric angular orientation (twisted or angled relative to the through-opening) rather than being perpendicular. This asymmetric configuration prevents the hold-down device from tilting or jamming during assembly and operation, as the angled surface guides proper alignment. While this increases angular accuracy requirements, the asymmetric design inherently guides assembly in the correct orientation.
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 configuration ensures that the hold-down spring remains securely attached to the pressure device, preventing 'springing out' and maintaining contact even under extreme conditions, allowing for axial movement while preventing tilting and jamming, thus ensuring consistent brake function.
Implementation Method 1
a lateral (tangential) relative movement can take place between the hold-down spring and the pressure device depending on the direction of rotation of the brake disc and the rotational entrainment of the brake pad. In other words, the pressure device can carry out lateral (tangential) movements against the elastic restoring force of the held-down spring
Data Source
Figure 1~2
Figure 3~4
Figure 5~9d
AI summary
The invention relates to a disk brake, in particular for utility vehicles, having a brake disk (30) with a rotational axis (D), having a pressing device (10, 38) which, for braking, is pressed in the direction of the rotational axis against the brake disk, and a holding-down device (40), wherein the pressing device has a projection (16) which, in an installed state, extends through a passage opening (46) in the holding-down device. It is provided according to the invention that the projection, in the installed state, projects in the axial direction of the brake disk beyond a delimitation of the passage opening.