Sensor Fixing Structure With Holder And Lid For Vibration Resistance
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Solution Overview
Problem
Existing physical quantity sensors, such as temperature sensors in internal combustion engines, face durability issues due to vibration, which affects detection accuracy and support rigidity, especially when detecting temperature in heat-generating components.
Innovation Solution
A physical quantity sensor-fixing structure that uses a holder with a main body and lid member to securely attach the sensor to conductive support members, providing increased support rigidity through a housing portion and recessed grooves for lead wires, ensuring reliable connection and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the temperature sensing element is supported by the lead wire in a contactless manner, then the sensor structure is simple and easy to manufacture, but the support rigidity is insufficient and the sensor is likely to be shaken by vibration
Solution Approach 1:
The patent introduces a support member as an intermediary component between the lead wire and the temperature sensing element. The support member has a first end connected to the lead wire and a second end supporting the temperature sensing element, providing additional structural support and rigidity while maintaining the contactless support configuration. This mediator resolves the contradiction by enhancing support strength without complicating the manufacturing process.
2Device complexity
If the temperature sensing element is supported by the lead wire, then the sensor structure is simple, but the detection accuracy decreases due to changes in distance caused by vibration
Solution Approach 1:
The support member acts as a mediator that stabilizes the position of the temperature sensing element relative to the lead wire. By providing rigid support at the second end of the support member, the system maintains consistent positioning for temperature detection while keeping the overall structure relatively simple. This resolves the contradiction between device simplicity and measurement precision.
3Adaptability or versatility
If the sensor is mounted in a position to detect temperature of heat-generating portions, then the detection capability is improved, but the durability decreases due to vibration impact
Solution Approach 1:
The support member serves as a mediator that enhances the mechanical strength and durability of the sensor assembly. By providing additional support structure between the lead wire and the temperature sensing element, it enables the sensor to withstand harsh environments including vibration from heat-generating portions like electric motors, while maintaining the detection capability in these challenging positions.
Data Source
AI summary
A physical quantity sensor-fixing structure includes a holder holding a physical quantity sensor including a detection unit to detect a physical quantity and a plurality of lead wires connected to the detection unit. The holder fixes the physical quantity sensor to a plurality of conductive support members to be respectively connected to the plurality of lead wires. The holder includes a main body member including a housing portion to house at least a portion of the physical quantity sensor, and a lid member covering at least a portion of the housing portion.