Disk Brake Pad Retainer Impact Suppression Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing disk brake systems experience backlash and generate cronk noise due to vibrations, particularly when driving over stepped parts, as the friction pad's lug pieces collide with the outer side surfaces of the pad guide grooves despite the urging force of the pad retainer.
Innovation Solution
A disk brake design featuring U-shaped pad guide grooves with impact suppressing parts, including stepped outer side pieces and elastic loop parts that absorb collision forces, ensuring the lug pieces are securely positioned and preventing collisions with the outer side surfaces of the pad guide grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pad retainer uses resilient parts to urge the lug pieces outward, then the backlash is suppressed and the friction pad is held at prescribed positions, but under large vibrations the lug pieces collide with the outer side surfaces of the pad guide grooves generating cronk noise
Solution Approach 1:
The patent introduces impact suppressing parts (buffer pieces) that protrude from the outer side pieces of the pad retainer toward the outer side surfaces of the pad guide grooves. These buffer pieces are positioned in advance to absorb collision forces before the lug pieces can directly strike the guide groove surfaces, thereby preventing cronk noise while maintaining the backlash suppression function of the resilient parts
Solution Approach 2:
The buffer pieces act as an intermediary element between the lug pieces and the outer side surfaces of the pad guide grooves. When collision occurs under large vibrations, the buffer pieces absorb the impact force, mediating the interaction between the moving lug pieces and the stationary guide groove surfaces, thus eliminating direct metal-to-metal contact and the resulting cronk noise
2Reliability
If the pad retainer is attached to caliper support arms using bent attaching pieces, then the attachment is secure, but the structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into the outer side pieces of the pad retainer: they provide attachment surfaces for the caliper support arms, serve as mounting structures for the resilient parts, and include protruding buffer pieces for impact suppression. By merging these functions into a single integrated component rather than separate parts, the overall structure is simplified while maintaining secure attachment and all required functionalities
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 design effectively suppresses backlash and cronk noise by maintaining the friction pad's position and absorbing collision forces, ensuring stable operation even under increased vibrations, while allowing for simple and secure attachment of the pad retainer to the caliper support arms.
Implementation Method 1
pad resilient parts that urge the friction pads outward in the radial direction of the disk
Implementation Method 2
impact suppressing parts that restrain the lug pieces from colliding with the outer side surfaces in the radial direction of the disk through the outer side pieces
Data Source
AI summary
A disk brake for a vehicle includes: a caliper bracket; a pair of caliper support arms; pad guide grooves that have outer side surfaces, inner side surfaces and opposed surfaces; and lug pieces that protrude on both side parts of back plates of friction pads supported by the pad guide grooves through a pad retainer, the pad retainer including a pair of retainer parts, a connecting piece and pad resilient parts, wherein: the retainer parts include inner side pieces arranged along the inner side surfaces of the pad guide grooves, outer side pieces arranged along the outer side surfaces of the pad guide grooves and interior pieces that connect the outer side pieces to the inner side pieces; and the outer side pieces include impact suppressing parts that restrain the lug pieces from colliding with the outer side surfaces through the outer side pieces.