Disk Brake Seal Pretensioning via Integrated Carrier Structure

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Solution Overview

Problem

Traditional disk brake designs require additional structural parts for seal pretensioning, leading to increased assembly complexity, risk of seal failure, and susceptibility to corrosion, compromising the sealing effectiveness and sliding function.

Innovation Solution

An integrated pretensioning device on the carrier automatically pretensions the seal upon placement of the holding device, eliminating the need for separate parts and ensuring reliable sealing without distortion or corrosion exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate additional part (loose ring or set-on holder) is used to pretension the seal, then the seal can be held in position, but the assembly complexity increases and the risk of seal failure increases

Engineering Contradiction:

Improveseal retention reliabilityVSAvoidnumber of additional parts

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates the pretensioning function directly into the holding device by forming a pretensioning device on the carrier that contacts the seal. This merging of functions eliminates the need for separate additional parts (loose rings or set-on holders) while maintaining reliable seal pretensioning. The holding device now performs both the holding function and the pretensioning function through its integrated structure.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If a separate additional part is used to pretension the seal, then the seal can be secured, but the assembly expense and manufacturing cost increase

Engineering Contradiction:

Improveseal sealing effectivenessVSAvoidassembly expense

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent reduces manufacturing and assembly expenses by integrating the pretensioning function into the holding device structure. The pretensioning device is formed directly on the carrier as part of the holding device, eliminating the need to manufacture and assemble separate additional parts. This integration simplifies the manufacturing process and reduces overall assembly costs while maintaining effective seal pretensioning.

Inventive Principle:

Principle #5Merging (Combining)

3Strength

If the guide bolt is supported non-positively and positively on the carrier, then the guide bolt can be fastened, but the contact area is exposed to corrosion

Engineering Contradiction:

Improveguide bolt fastening strengthVSAvoidcorrosion susceptibility

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent addresses the corrosion issue by extending the seal's protective function to the support area of the guide bolt on the carrier. The seal, already present for radial sealing, is configured to also protect the contact area between the guide bolt and carrier from environmental influences. This dimensional extension of the seal's protective function covers the previously exposed support area without compromising the fastening strength.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

4Ease of operation

If an annular cord is used to pretension the seal radially, then the sliding function is maintained, but the pretensioning requires a separate assembly step

Engineering Contradiction:

Improvesliding functionVSAvoidassembly time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The patent eliminates the separate assembly step for pretensioning by integrating the pretensioning function into the holding device structure. The pretensioning device is pre-formed on the carrier and automatically engages with the seal when the holding device is assembled. This preliminary integration of the pretensioning mechanism ensures that the seal is pretensioned in the radial direction to maintain sliding function without requiring an additional assembly step, thereby reducing assembly time.

Inventive Principle:

Principle #10Preliminary action

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 enhances the sealing efficiency and reliability by providing automatic seal pretensioning, reducing assembly complexity and protecting the guide bolt's support area from environmental influences, while maintaining the caliper's sliding functionality.

Implementation Method 1

a seal (4) fastened in a recess (9, 17) on the holding device (3, 1) and with a pretensioning device (18) for pretensioning the seal (4) in the recess (9, 17). The pretensioning device (18) reacts to the placing of the holding device (3, 1).

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS9506511B2Disk brake, in particular for utility vehicles, and seal of a disk brake of said type

Publication Date: 2016.11.29 ZF CV SYST EURO BV

AI summary

The invention relates to a disk brake, in particular for utility vehicles, having a carrier, a caliper, a holder device for displaceably holding the caliper on the carrier, a seal which is fixed in a recess on the holder device, and a pretensioning device for pretensioning the seal in the recess, wherein the pretensioning device is activated by the mounting of the holder device.