Vehicular Rotating Electric Machine Bushing Mounting
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Solution Overview
Problem
Conventional automotive alternators have a bushing with low rigidity, which complicates the mounting of the output wire due to axial movement, reducing mounting workability.
Innovation Solution
An automotive rotary electric machine design that includes a bushing constrained by an intermediary member with increased rigidity, using snap-fitting engagement to prevent axial movement and improve mounting stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bushing is fixed to the rear cover with little rigidity, then the structure is simple, but the bushing moves axially during output wire mounting, complicating the mounting work
Solution Approach 1:
The patent introduces an intermediary member (output terminal portion) between the rear cover and the bushing. This intermediary member has increased rigidity compared to the rear cover, and the bushing is fixed to this intermediary member rather than directly to the rear cover. The intermediary member acts as a mediator that provides a stable mounting surface for the bushing, preventing axial movement during output wire mounting while maintaining overall structural simplicity.
2Volume of moving object
If the bushing is fixed to the rear cover, then the assembly is compact, but the low rigidity of the rear cover causes axial movement of the bushing, reducing mounting precision
Solution Approach 1:
The intermediary member serves as a mediator that enables precise bushing positioning without increasing overall assembly volume significantly. By fixing the bushing to the rigid intermediary member rather than the flexible rear cover, the patent achieves stable and precise mounting of the output wire while maintaining a compact overall structure.
Solution Approach 2:
The patent segments the mounting structure into distinct functional parts: the rear cover for structural support, the intermediary member for precise positioning and rigid mounting, and the bushing for insulation and protection. This segmentation allows each component to perform its specific function optimally, with the intermediary member specifically designed to provide the rigidity needed for precise mounting.
Data Source
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AI summary
The present invention provides an automotive rotary electric machine that can improve mounting workability of an output wire. In the automotive rotary electric machine of the present invention, an output terminal portion includes: an output terminal that includes: a shaft portion on which an external screw thread portion is formed; and a head portion that is formed integrally on a first axial end of the shaft portion; and an intermediary member that includes: a nut portion that is screwed onto the external screw thread portion to fix a positive electrode output end of a rectifier by fastening against the head portion; and a fastening seat on a first axial end of which the nut portion is formed integrally, and that is mounted so as to be fitted over the shaft portion such that a second axial end protrudes axially out of a bushing, the bushing is mounted to the intermediary member such that axial movement of the bushing is constrained, and an external output wire is mounted to a second axial end surface of the fastening seat in a state of contact by a fastening force from a fixing nut that is screwed onto the external screw thread portion such that the external output wire is fixed by fastening between the fixing nut and the fastening seat.