Opposed-Piston Disc Brake Pipe Mounting for Low-Torque Assembly

Solution Overview

Problem

Existing opposed piston type disc brake devices face challenges in suppressing the floating of communication pipes with respect to calipers, which affects assembly efficiency and can lead to excessive tensile stress at connection points, potentially compromising sealing performance.

Innovation Solution

The design incorporates a cover tube made of elastic material that contacts the caliper with a radial fastening margin, eliminating central axis direction fastening margins and allowing contact only in predetermined directions orthogonal to the flare nuts' central axis, thereby reducing the need for increased elastic deformation and torque during assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the cover tube is made to contact the caliper with a fastening margin in all directions to suppress floating, then the communication pipe stability is improved, but the assembly work efficiency deteriorates due to increased tightening torque requirements

Engineering Contradiction:

Improvecommunication pipe stabilityVSAvoidassembly work efficiency

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent applies local quality by providing fastening margins only in radial directions (upward and downward) rather than in all directions including the central axis direction. The cover tube is configured to have fastening margins with respect to the caliper in radial directions while intentionally eliminating the fastening margin in the central axis direction where flare nuts are located. This localized approach maintains communication pipe stability where needed while avoiding interference with flare nut assembly operations.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the cover tube is made to contact the caliper with increased fastening margin to suppress floating, then the communication pipe stability is improved, but the tensile stress at connection points increases

Engineering Contradiction:

Improvecommunication pipe stabilityVSAvoidtensile stress at connection portion

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

The patent applies local quality by providing fastening margins only in radial directions (upward and downward) rather than in all directions including the central axis direction. The cover tube is configured to have fastening margins with respect to the caliper in radial directions while intentionally eliminating the fastening margin in the central axis direction where flare nuts are located. This localized approach maintains communication pipe stability where needed while avoiding interference with flare nut assembly operations.

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If the cover tube is made of elastic material to provide fastening margin, then the communication pipe stability is improved, but the tightening torque required for flare nuts increases due to increased elastic deformation

Engineering Contradiction:

Improvecommunication pipe stabilityVSAvoidtightening torque

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

The patent applies local quality by providing fastening margins only in radial directions (upward and downward) rather than in all directions including the central axis direction. The cover tube is configured to have fastening margins with respect to the caliper in radial directions while intentionally eliminating the fastening margin in the central axis direction where flare nuts are located. This localized approach maintains communication pipe stability where needed while avoiding interference with flare nut assembly operations.

Inventive Principle:

Principle #3Local quality

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 approach enhances assembly efficiency by minimizing the tightening torque required for flare nuts and reduces tensile stress at connection points, improving sealing performance and reducing defective fractions.

Implementation Method 1

a cover tube (28) made of an elastic material that covers a part of the pipe body (26) and that is in contact with the caliper (2) with a fastening margin

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20240309920A1Opposed piston type disc brake device

Publication Date: 2024.09.19 AKEBONO BRAKE IND CO LTD

AI summary

An opposed piston type disc brake device includes: a caliper including an inner body including an inner cylinder, and an outer body including an outer cylinder; and a communication pipe disposed around the caliper and connecting the inner cylinder and the outer cylinder. The communication pipe includes a pipe body, a pair of flare nuts, and a cover tube which covers a part of the pipe body and is in contact with the caliper with a fastening margin, the cover tube being made of an elastic material. The cover tube does not have the fastening margin with respect to the caliper in a central axis direction of each of the flare nuts.