Motor Device Elastic Member Concave Portion Air Flowability
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Solution Overview
Problem
Conventional motor devices have poor air flowability between the outer peripheral surface of the elastic member and the housing, leading to reduced efficiency in airtightness tests due to the entire periphery of the elastic member being in contact with the housing, which hinders air evacuation.
Innovation Solution
A motor device configuration featuring a motor case with a protrusion portion and a housing with a cylindrical surface, where the elastic member has concave portions between its outer peripheral surface and the housing's cylindrical surface, allowing air to pass through and enhance flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire periphery of the elastic member is in contact with the housing, then the elastic member provides effective vibration damping and positioning, but air flowability between the elastic member and the housing deteriorates
Solution Approach 1:
The contact periphery of the elastic member is segmented into multiple discrete contact points rather than continuous contact. The first and second through-holes create separation in the contact region, allowing air to pass through while the elastic member still contacts the housing at multiple locations to provide vibration damping and positioning stability.
2Stability of the object's composition
If the entire periphery of the elastic member is in contact with the housing, then the motor is firmly positioned, but air evacuation during airtightness testing becomes time-consuming
Solution Approach 1:
The continuous contact periphery is segmented by providing through-holes that create air passage channels. This segmentation allows air to evacuate through multiple paths during airtightness testing, significantly reducing test time while the elastic member maintains firm motor positioning through distributed contact at the remaining peripheral regions.
3Strength
If the elastic member maintains full peripheral contact with the housing, then structural integrity is ensured, but heat dissipation through convection is reduced
Solution Approach 1:
The full peripheral contact is segmented by introducing through-holes that create convection channels. These holes allow air to flow through the elastic member housing interface, enhancing convective heat dissipation while the elastic member maintains structural integrity through its material properties and distributed contact configuration.
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 improves air flowability between the elastic member and the housing, enhancing the efficiency of airtightness tests and heat dissipation through convection, while maintaining the elastic member's vibration-damping properties.
Implementation Method 1
an elastic member interposed between the motor case and the housing... configured to urge the motor case toward the first inner surface
Implementation Method 2
air can pass between the outer peripheral surface of the elastic member and the cylindrical surface of the housing by passing through the first concave portion, thereby enhancing flowability of air
Data Source
AI summary
This motor device is provided with, e.g.: a motor having a motor case and a shaft supported by the motor case so as to be capable of rotating about a rotation center; a housing in which the motor is housed; and an elastic member interposed between the motor case and the housing. A first concave part in communication with both sides of the elastic member in the axial direction is provided between the outer peripheral surface of the elastic member and a cylindrical surface of the housing.