Oil Pressure Sensor Attachment Structure for Compact Engine Control
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Solution Overview
Problem
Existing oil pressure sensor attachment methods result in increased size of the oil pressure control device to ensure sufficient attaching strength, leading to size enlargement issues.
Innovation Solution
An oil pressure sensor attachment structure that includes a sensor case with a columnar portion and flange portion, fixed by a fixing member with a pressing portion, which contacts the oil path body to secure the sensor without the need for external threads, thereby maintaining strength while minimizing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the male thread portion of the oil pressure sensor is fastened into the female thread hole of the control valve to secure attaching strength, then the attaching strength is improved, but the oil pressure sensor and entire control device increase in size
Solution Approach 1:
The fixing member is divided into distinct functional portions: a fixing portion that contacts the oil path body and a pressing portion that contacts the flange portion. This segmentation allows each portion to perform its specific function efficiently, securing the sensor without requiring a large engagement length
Solution Approach 2:
The fixing member acts as an intermediary component between the sensor case and the oil path body. It transfers and distributes the securing force through its fixing and pressing portions, achieving strong attachment without requiring the sensor itself to be large or have threaded portions
2Strength
If the engagement length between thread portions is lengthened to secure attaching strength under high pressure, then the attaching strength is improved, but the oil pressure sensor becomes larger
Solution Approach 1:
Instead of increasing attachment strength by extending the engagement length in one dimension (thread depth), the invention transitions to a different dimensional approach using a flange portion that distributes force radially, and a fixing member that secures the sensor through a pressing action in a different spatial configuration
3Volume of moving object
If a fixing member with fixing portion and pressing portion is used to secure the sensor case, then the device size is reduced, but the attaching strength must be maintained under high pressure
Solution Approach 1:
The fixing member concentrates its securing function at specific locations: the fixing portion contacts the oil path body at a localized area, while the pressing portion contacts the flange portion at another localized area. This local quality approach ensures strong attachment at critical points without requiring the entire structure to be large
Solution Approach 2:
The fixing member is designed to apply pressing force to the flange portion before final securing, ensuring the sensor case is firmly attached to the oil path body from the outset. This preliminary pressing action prevents detachment under subsequent high pressure conditions
Data Source
AI summary
According to one aspect of the present invention, there is provided an oil pressure sensor attachment structure including: the oil path body; the sensor case; and a fixing member which fixes the sensor case to the oil path body. The sensor case has a columnar portion which is disposed along a central axis extending in an up and down direction, and a flange portion which protrudes from the columnar portion to an outside in a radial direction. The fixing member has a fixing portion which comes into contact with the oil path body and is fixed thereto, and a pressing portion which comes into contact with the upper surface of the flange portion and presses the flanges portion against the oil path body. The fixing portion and the pressing portion are disposed with an interval therebetween.