Electric Wire Holder Serration for Parking Brake
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Solution Overview
Problem
Conventional electric wire holders for electric parking brakes require additional components like tubular rubber members, increasing costs and complicating attachment due to the need for precise positioning and frictional forces.
Innovation Solution
An electric wire holder with a fixed portion and a holding portion featuring a serration on the inner surface for crimping, allowing direct engagement with the electric wire's outer coating and reducing the need for additional components, facilitating easy attachment by eliminating the tubular rubber member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tubular rubber member is used to hold the electric wire, then the wire can be securely held, but the component cost increases and the attachment becomes more complex
Solution Approach 1:
The holding function previously performed by the separate tubular rubber member is merged into the fixing bracket itself. The fixing bracket is equipped with a holding portion that directly engages with the electric wire through a crimping operation, eliminating the need for the rubber member and reducing component count while maintaining secure wire holding.
Solution Approach 2:
The tubular rubber member, which was an additional component used to provide frictional holding, is extracted (removed) from the system. The holding function is achieved directly by the fixing bracket's holding portion through mechanical crimping, simplifying the overall structure.
2Reliability
If the outer diameter of the electric wire is set to match the tube inner diameter for intimate contact, then the wire can be held securely, but frictional force makes it difficult to position the rubber member
Solution Approach 1:
The holding portion is designed with a predetermined geometry that facilitates easy positioning before crimping. The opening of the holding portion allows the electric wire to be inserted without requiring precise friction-based positioning, and the crimping operation is performed after the wire is in place, ensuring both ease of operation and secure holding.
3Reliability
If precise positioning of the rubber member and fixing bracket is required, then secure attachment is achieved, but the attaching operation becomes difficult
Solution Approach 1:
The holding portion is designed with specific local geometric features (opening configuration, crimping surface) that guide the electric wire into the correct position during attachment. These localized structural characteristics ensure proper positioning without requiring complex alignment procedures, making the attaching operation easier while maintaining secure attachment.
4Reliability
If additional components like tubular rubber members are used, then wire holding reliability improves, but component cost increases
Solution Approach 1:
The holding function is merged into the fixing bracket structure itself, eliminating the need for separate tubular rubber members. This reduces the quantity of components and associated costs while maintaining reliable wire holding through the integrated holding portion with crimping capability.
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 reduces component costs and simplifies attachment by securely holding the electric wire without lateral shifts or rotations, using a serration that engages directly with the wire's outer coating, thus enhancing reliability and ease of use.
Implementation Method 1
a serration 16 is formed on an inner surface of the holding portion 14 at a position corresponding to a region to be crimped using a crimping tool... the serration 16 is pressed against the outer insulating coating material 26 of the electric wire 20 for an EPB, and the protrusions 16b in the serration 16 firmly engage with the outer insulating coating material 26
Implementation Method 2
The holding portion 14 is crimped using a crimping tool, so that the diameter of the space in the recessed portion 14a is reduced
Implementation Method 3
a frictional force is generated between the electric wire 20 for an EPB and the tubular rubber member 106... the clearance of the opening 104b is made into a size such that the tubular rubber member 106 cannot dislodge
Data Source
AI summary
An electric wire holder includes a fixed portion to be fixed to a support panel provided on a vehicle body and a holding portion that extends from one end of the fixed portion and is configured to hold an electric wire to be routed to an electric parking brake. The holding portion is provided with an opening for receiving the electric wire, the opening being open between a leading end of the holding portion and the one end of the fixed portion, and a recessed portion for accommodating the electric wire that has passed through the opening. In the recessed portion, a serration is formed on an inner surface at a position corresponding to a region to be crimped by a crimping tool.