Automotive Cable Tie with Standoff Spacing
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Solution Overview
Problem
Cable ties used in automotive applications to secure electrical wires against valve covers often cause insulation chafing due to wire contact, leading to potential hazardous electrical conditions as the valve cover heats up during vehicle operation.
Innovation Solution
A one-piece cable tie with a serrated strap and a fir-tree type fastener integrated with an elongated standoff, which includes a disc-shaped enlarged member to space the wires away from the valve cover, preventing direct contact and insulation wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cable tie with a Christmas-tree fastener is used to secure wires against the valve cover, then the wires are retained securely against the valve cover, but the wire insulation chafes and wears away due to direct contact with the hot surface
Solution Approach 1:
The patent introduces a foam material intermediary between the cable tie and the valve cover. This foam material contacts the hot valve cover surface while the wires remain suspended above it, preventing direct contact and insulation chafing. The foam acts as a thermal and physical buffer that protects the wire insulation from damage.
Solution Approach 2:
The cable tie system is segmented into distinct functional zones: a contact region with foam material that interfaces with the valve cover, and a non-contact region where wires are suspended above the foam. This segmentation allows the harmful thermal contact to be isolated from the wires while maintaining secure retention.
2Stability of the object's composition
If wires are bundled tightly against the valve cover to prevent movement, then the bundle is secured against rattling, but the insulation suffers from friction and heat exposure
Solution Approach 1:
The foam material serves as an intermediary layer that provides a stable base for cable tie attachment while creating a gap between the wires and the hot valve cover surface. This maintains bundle stability through secure anchoring to the foam, which itself is stabilized against the valve cover, while eliminating harmful friction and heat exposure to the insulation.
3Volume of moving object
If the cable tie is positioned close to the valve cover surface to minimize space, then the assembly is compact, but the wires are exposed to harmful thermal and mechanical conditions
Solution Approach 1:
The solution utilizes the depth dimension by positioning the foam material directly against the valve cover surface and allowing the wires to extend upward into a non-contact zone. This vertical arrangement maintains compact horizontal footprint while creating sufficient thermal separation in the vertical dimension to protect the insulation.
Data Source
AI summary
A cable tie includes a locking head and an attached strap, the locking head being adapted to receive and engage the strap when the tie is formed into a closed loop. The cable tie additionally includes a fir-tree fastener connected to the locking head by an elongated standoff that includes a stem and an enlarged member which separates the stem into first and second sections. In use, a plurality of wires bundled together by the tie can be secured to an automotive valve cover by inserting the fastener and the first section of the stem through a corresponding bore formed in the valve cover. With tie inserted as such, the second section of the stem serves to space the bundled wires away from the valve cover, with the first section of the stem and the enlarged member together serving to stabilize the tie within the bore of the valve cover.