Electric Fluid Machine Mounting Structure for Vibration Damper Durability
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Solution Overview
Problem
Existing vehicle electric compressor mounting structures experience stress concentration and damage due to excessive elastic deformation of vibration dampers, leading to durability issues and noise generation during vibration damping.
Innovation Solution
The vehicle electric fluid machine incorporates a housing with mounting legs featuring insertion holes, fasteners with sleeves and annular plates, and elastic vibration dampers with collars and elongated protrusions, where the elongated protrusion defines a deformation limit to prevent excessive collar deformation and reduce stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic vibration dampers are used to damp vibration, then vibration damping performance is improved, but stress concentration and damage occur due to excessive elastic deformation
Solution Approach 1:
The collar portion is designed with different local properties: the main body allows elastic deformation for vibration damping, while the protrusion portion provides a rigid stop to limit maximum deformation. This local differentiation enables the damper to simultaneously achieve effective vibration damping and prevent excessive deformation that causes stress concentration.
Solution Approach 2:
The protrusion portion of the collar acts as a pre-designed deformation limit structure that prevents excessive elastic deformation before it can cause damage. By providing this mechanical stop in advance, the system cushions against the harmful effects of over-deformation and prevents stress concentration and material fatigue.
2Reliability
If the collar is allowed to deform elastically for vibration damping, then vibration damping is effective, but noise is generated due to excessive deformation
Solution Approach 1:
The protrusion portion of the collar serves as a pre-established mechanical stop that limits the maximum elastic deformation of the collar. By preventing excessive deformation in advance, this structure eliminates the source of noise generation while maintaining effective vibration damping within the controlled deformation range.
3Ease of manufacture
If adhesive or adhesion prevention measures are taken, then manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the need for adhesive materials or complex adhesion prevention treatments by using a purely mechanical solution. The protrusion portion of the collar provides a mechanical stop that prevents excessive deformation without requiring any adhesive substances, thereby reducing manufacturing cost while ensuring reliable adhesion prevention.
Solution Approach 2:
The collar structure itself provides the adhesion prevention function through its own geometric design (the protrusion portion), without requiring external adhesive materials or additional processing. The structure serves its own purpose of limiting deformation and preventing adhesion issues, eliminating the need for separate adhesive management processes.
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 effectively limits collar deformation, reduces stress concentration, enhances durability, and maintains effective vibration damping while preventing noise and cost increases from adherence processes.
Implementation Method 1
each of the elastic vibration dampers having a cylindrical portion disposed between an inner circumferential surface of the mounting leg and an outer circumferential surface of the sleeve, and a collar extending from one of opposite ends of the cylindrical portion in a radial outward direction of the cylindrical portion
Implementation Method 2
elastic vibration dampers disposed on opposite sides of the mounting leg in the axial direction of the mounting leg
Data Source
AI summary
A vehicle electric fluid machine includes: a housing provided with a mounting leg; a fastener having a shaft portion and a head portion at one end of the shaft portion, the fastener fastening the other end of the shaft portion to a mounting object; a sleeve disposed between the mounting leg and the shaft portion; elastic vibration dampers each having a cylindrical portion and a collar extending from one of opposite ends of the cylindrical portion in its radial outward direction; and an annular plate through which a fastening force is applied to the mounting leg. The annular plate has an elongated protrusion protruding toward the mounting leg, the elongated protrusion spaced from the collar with a predetermined clearance formed radially outside the collar. A deformation limit of the collar is defined by the elongated protrusion being in contact with the collar.