Bonding Intermediating Member for Cable Sealing
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Solution Overview
Problem
Existing electronic apparatuses with sealed internal spaces using resin face challenges in maintaining environmental resistance, particularly in harsh environments with temperature changes and exposure to oils, as the bonding force between cables and sealing resin parts is insufficient, leading to potential separation issues.
Innovation Solution
An electronic apparatus design featuring a bonding intermediating member with a cylindrical protrusion that reduces residual stress and tracks expansion and contraction of the sealing resin part, ensuring a strong bonding force between the cable and the sealing resin part, using a combination of resin materials for the bonding intermediating member, sealing resin, and cable sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cable is merely held by an elastically deformable clamp that fits into an opening in the case, then the cable can be drawn out from the case, but the bonding force between the cable and the sealing resin part is insufficient leading to separation
Solution Approach 1:
The bonding intermediating member serves as a mediator between the cable and the sealing resin part. It has a base that covers the cable outer sheath and a protrusion that extends into the sealing resin part, creating a mechanical interlocking structure. This intermediary component provides both cable holding function and reliable bonding to the sealing resin part, resolving the contradiction between ease of cable installation and bonding reliability.
Solution Approach 2:
The bonding intermediating member is segmented into two functional parts: a base portion that interfaces with the cable outer sheath and a protrusion portion that interfaces with the sealing resin part. This segmentation allows each part to be optimized for its specific function - the base for cable attachment and the protrusion for sealing resin bonding, thereby achieving both ease of operation and high reliability.
2Reliability
If the sealing resin part is made large to ensure adequate bonding area, then bonding force improves, but residual stress increases causing separation in harsh environments
Solution Approach 1:
The bonding intermediating member concentrates the bonding function in a localized protrusion structure rather than requiring a large-area sealing resin part. The protrusion provides sufficient bonding area in a compact form, reducing the overall volume of sealing resin needed and thereby minimizing residual stress while maintaining reliable bonding force.
3Reliability
If a protrusion is provided on the bonding intermediating member to reduce resin amount and residual stress, then environmental resistance improves, but the structure becomes more complex
Solution Approach 1:
The bonding intermediating member merges multiple functions into a single component: cable attachment (via the base), bonding to sealing resin (via the protrusion), and stress relief (through the protrusion geometry). This integration achieves improved environmental resistance without requiring multiple separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
To provide an electronic apparatus having particularly excellent environmental resistance. An electronic apparatus includes a case, a cable drawn out from the case, a bonding intermediating member that is made of a resin and joined to the cable, a cylindrical clamp holding the cable, and a sealing resin part filling an internal space defined by the case and the clamp. The cable has a core wire and a sheath that is made of a resin covering the core wire and the core wire is exposed not to be covered by the sheath at an end of the cable. The bonding intermediating member has a cylindrical base covering an outer circumferential face of the sheath and a cylindrical protrusion protruding toward a tip side of the cable. All of an inner circumferential face and an outer circumferential face of the protrusion and an end face at a tip side of the protrusion in an axial direction are covered by the sealing resin part.