In-Vehicle Sensor Fixing Member Axis Intersection
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Solution Overview
Problem
The increasing demand for downsized and lightened vehicles poses a challenge for the installability of detection devices, as conventional solutions require larger resin members to bend wires, which interferes with vehicle components and hinders compact design.
Innovation Solution
An in-vehicle detection device featuring a cable with insulated electric wires covered by a sheath, a sensor with a lead wire connected to the central conductor, and a fixing member with a tubular portion that houses the sensor and cable, where the sheath's central axis intersects with the tubular portion at a predetermined angle, allowing the wires to be bent and minimizing the fixing member's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wire is bent in the resin member to prevent interference with vehicle components, then interference prevention is improved, but the resin member size must increase according to the bending radius
Solution Approach 1:
The patent changes the wire routing from a planar bend within the resin member to a three-dimensional path that exits the resin member and bends externally. The wire leads from the sensor in the resin member, exits through a opening, and then bends in space away from vehicle components, eliminating the need for the resin member to accommodate the bending radius.
Solution Approach 2:
The patent extracts the wire bending function from the resin member structure. Instead of the resin member containing and bending the wire, the wire is allowed to exit the resin member and bend independently in the surrounding space, separating the structural function of the resin member from the wire routing function.
2Object-affected harmful factors
If the wire is led perpendicular to the Hall IC axis to avoid interference, then interference prevention is improved, but the resin member must accommodate a 90° circular bend increasing its size
Solution Approach 1:
The patent allows the wire to lead perpendicular to the Hall IC axis as desired, but instead of bending within the resin member plane, the wire exits the resin member and completes its perpendicular routing in three-dimensional space. This maintains the interference prevention benefit while eliminating the size penalty.
3Volume of moving object
If devices are disposed densely to meet downsized vehicle requirements, then vehicle size reduction is improved, but installability of detection devices deteriorates due to space constraints
Solution Approach 1:
The patent segments the detection device into two functional parts: a compact sensor portion housed in the resin member for dense mounting on the vehicle, and a flexible cable portion that can be routed externally to connect with other vehicle systems. This segmentation allows the sensor to be densely positioned while the cable provides installation flexibility.
Solution Approach 2:
The patent changes the cable configuration from a rigid in-member routing to a flexible external routing with adjustable path. The cable can be routed through openings in the resin member and bent at various angles and positions to accommodate different installation scenarios, making the detection device adaptable to densely packed vehicle environments.
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 configuration enhances the installability of the detection device by preventing interference with vehicle components, reducing the size of the fixing member, and ensuring effective mounting on vehicles while maintaining the integrity of the detection elements.
Implementation Method 1
a magnetic sensor that detects a magnetic field strength
Data Source
AI summary
An in-vehicle detection device includes a cable that includes a plurality of insulated electric wires that are formed by covering a central conductor with an insulator, and a sheath that collectively covers the insulated electric wires, a sensor that includes a sensor main body including a detection element, and a lead wire that is led from the sensor main body and connected to the central conductor, and a fixing member that includes a tubular portion to house the sensor and fixes the sensor and the cable to each other. The fixing member holds the insulated electric wires that are exposed from the sheath in a bent state thereof between an end of the sheath and the lead wire. A central axis of a part of the sheath that is held by the fixing member intersects with a central axis of the tubular portion at a predetermined angle.