Motor Unit Decelerator Board Inclination
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Solution Overview
Problem
Conventional motor units with decelerators face challenges in achieving a compact design while maintaining an appropriate board shape, leading to increased manufacturing costs and reduced reliability due to interference between motor fastening portions and the control board.
Innovation Solution
The motor unit is designed with a control board that is inclined to avoid overlap with motor fastening portions, allowing for a general rectangular shape without the need for relief portions, and features a board housing with a small opening for the connector, reducing the size of waterproof packing and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the motor is fastened to the main body casing with four screws, then the motor is securely fixed, but the motor fastening portions overlap with the control board, requiring large relief portions that increase manufacturing cost and reduce reliability
Solution Approach 1:
The control board is arranged in an inclined posture relative to the axis of the motor output shaft, changing the spatial dimension of board placement. This inclination allows the control board to pass through the overlapping region without interference, eliminating the need for relief portions while maintaining both motor fastening strength and board integrity
2Shape
If the motor fastening portions are displaced away from the main body casing to avoid overlap with the control board, then the control board can maintain its shape, but the motor is also arranged apart from the main body casing, increasing the overall unit size
Solution Approach 1:
Instead of displacing components along the axial direction (one dimension), the control board is inclined relative to the motor output shaft axis, utilizing angular orientation to resolve the overlap issue. This allows the control board to maintain its rectangular shape without requiring the motor to be positioned farther from the main body casing, thus preventing unit size increase
3Strength
If large relief portions are formed on both sides of the control board to avoid interference with motor fastening portions, then the fastening is maintained, but the board area is reduced and manufacturing cost increases
Solution Approach 1:
The control board is arranged in an inclined posture relative to the motor output shaft axis, changing the spatial configuration to eliminate overlap with motor fastening portions. This allows the control board to maintain its full rectangular area without requiring relief portions, thereby reducing manufacturing cost and enabling optimal element arrangement
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 design achieves compactness, cost reduction, and improved reliability by avoiding interference and optimizing the board arrangement, while maintaining the strength and waterproofing of the motor unit.
Implementation Method 1
a decelerator including a worm and a worm wheel
Data Source
AI summary
A worm wheel is installed inside a wheel accommodation chamber of a body casing; a motor is fastened by screws from the right side perpendicular to the axis line of the worm wheel, thus forming a motor fastening part; and a worm fixed to an output shaft of the motor is engaged with the worm wheel. A board accommodation chamber is formed so as to be adjacent to the right of the wheel accommodation chamber, and a control board is inserted inside the board accommodation chamber from below. The control board is disposed so as to be inclined in a direction in which the upper end of the control board is displaced toward the wheel accommodation chamber from an erect attitude perpendicular to the axis line of the output shaft of the motor, and thus the upper end is separated from the motor fastening part in the direction of the axis line of the output shaft.