Electric Rotating Machine End Frame Bolt Insertion
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Solution Overview
Problem
Existing electric rotating machines for vehicle power steering devices face challenges in effectively supporting the stator between end frames, leading to oscillation and mechanical stress on the electric control portion due to inadequate axial force application from through-bolts, which are restricted by the space for the control portion.
Innovation Solution
The electric rotating machine design includes through-holes on the radial outer periphery of the second end frame, allowing through-bolts to be inserted from the side of the second end frame and screwed into the first end frame, effectively applying axial force to the stator and supporting member, thereby firmly connecting the end frames and reducing mechanical stress on the control portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If through-bolts are inserted from the first end frame side, then the electric control portion can be fixed to the first end frame, but the axial force of the through-bolts cannot be effectively applied to the stator
Solution Approach 1:
The patent inverts the traditional through-bolt insertion direction by inserting bolts from the second end frame side (opposite to the control portion side) rather than from the first end frame side. This inversion allows the bolts to pass through the stator effectively, applying axial force to firmly support the stator between both end frames while still enabling control portion fixation.
2Stability of the object's composition
If the axial force of the through-bolts is made larger to suppress oscillation, then the oscillation of the end frame is suppressed, but the end frames may be bent in the axial direction
Solution Approach 1:
The patent applies preliminary action by pre-positioning the through-bolts to firmly support the stator between the end frames before oscillation occurs. The bolts are inserted through the stator and tightened to create preliminary clamping force, preventing end frame oscillation and bending under subsequent radial loads from the steering mechanism.
Data Source
AI summary
An electric rotating machine has a first end frame and a second end frame for firmly supporting a stator between them in an axial direction of the electric rotating machine. An electronic control portion is mounted to a rear side of the first end frame. Multiple through-holes are formed at a radial-outer periphery of the second end frame. Each of multiple through-bolts is inserted into the respective through-holes from a side of the second end frame and screwed into the first end frame, to thereby firmly connect the first and the second end frames to each other.