Motor Shaft Bearing Layout for Easier Assembly and Alignment
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Solution Overview
Problem
Existing motor devices require a large number of parts and complex assembly processes due to the need for accurate alignment of the armature shaft and worm shaft, which are supported by multiple bearings.
Innovation Solution
A motor device design that includes a stator, rotor, and a simplified bearing system with a first and second case supporting the rotation shaft at both ends, and a third bearing in between, along with a holder member to simplify assembly and reduce parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the armature shaft and worm shaft are supported by separate bearings in the yoke and gear case respectively, then the shafts can be rotatably supported, but the assembly work becomes troublesome and the number of parts increases
Solution Approach 1:
The patent merges the support functions for both the armature shaft and worm shaft into a single integrated bearing structure. The bearing unit includes a first bearing for the armature shaft and a second bearing for the worm shaft, both incorporated into one component that is mounted in the gear case, thereby reducing the number of separate parts and simplifying assembly operations while maintaining reliable shaft support.
Solution Approach 2:
The integrated bearing structure serves multiple functions simultaneously: it supports the armature shaft, supports the worm shaft, and provides a unified mounting interface in the gear case. This multi-functional design eliminates the need for separate bearing arrangements in both the yoke and gear case, reducing assembly complexity while maintaining structural reliability.
2Reliability
If the armature shaft and worm shaft are accurately disposed on the same axis, then proper power transmission is achieved, but the assembly work becomes troublesome
Solution Approach 1:
The patent introduces an intermediary bearing structure that mediates between the armature shaft and worm shaft positioning. The integrated bearing unit provides a common reference framework that automatically establishes proper axial alignment between the two shafts, eliminating the need for complex manual alignment procedures while ensuring accurate power transmission geometry.
Solution Approach 2:
The unified bearing structure creates an equipotential positioning system where both shafts are supported from a common baseline, making their axial alignment inherently equivalent and simplifying the manufacturing and assembly process. This approach ensures that both shafts are positioned on the same axis without requiring separate, complex alignment operations.
3Reliability
If multiple bearings are provided to support both shafts, then the shafts can be properly supported, but the number of parts increases
Solution Approach 1:
The patent combines multiple bearing functions into a single integrated bearing unit. Instead of providing separate bearings for the armature shaft and worm shaft in different locations (yoke and gear case), the invention incorporates both bearing functions into one unified structure that is mounted in the gear case, thereby reducing the total number of parts while maintaining adequate support for both shafts.
Data Source
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AI summary
Provided is a motor device capable of reducing the number of components and being easily assembled. The present invention comprises: a motor case 31 to which a stator 32 is fixed; a housing 41 against which the motor case 31 is butted; a rotary shaft 34 which is housed inside the motor case 31 and the housing 41; a first metal BR1 which is provided in the motor case 31 and supports the axial-direction base side of the rotary shaft 34; a second metal BR2 which is provided in the housing 41 and supports the axial-direction tip side of the rotary shaft 34; a ball bearing 36 which is provided between the first metal BR1 and the second metal BR2 in the axial direction of the rotary shaft 34 and supports the rotary shaft 34; and a holder member 38 which is positioned on the ball bearing 36 and holds a plurality of conductive members 39. The holder member 38 is sandwiched between the motor case 31 and the ball bearing 36.