Rotary Tool Housing Structure for Stator-Rotor Coaxial Alignment
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Solution Overview
Problem
Existing electric rotary tools have a dividable housing that is less rigid, leading to misalignment of the stator and rotor, which affects the tool's overall performance and stability.
Innovation Solution
An electric rotary tool design featuring a cylindrical housing with integral parts and a dividable housing that uses screws to fasten together, ensuring the stator and rotor are coaxially aligned and increasing the tool's rigidity, with support and positioning ribs for precise alignment and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dividable housing is used to accommodate the motor, then the housing can be easier to manufacture and assemble, but the rigidity of the housing decreases leading to misalignment of stator and rotor
Solution Approach 1:
The housing is divided into a motor housing and a gear case housing that are separately manufactured and then assembled together using fastening members. This segmentation allows each part to be manufactured independently with appropriate precision, while the overall assembly achieves the required alignment through dedicated positioning structures.
Solution Approach 2:
Positioning ribs are introduced as intermediary structures that extend from the motor housing into the gear case housing. These positioning ribs act as mediators that precisely locate and align the stator and rotor components during assembly, ensuring coaxial alignment even though the housing is dividable.
2Device complexity
If the stator and rotor are held by different parts of the housing, then the housing structure can be more modular, but the alignment between stator and rotor becomes difficult to maintain
Solution Approach 1:
Positioning ribs serve as intermediary structures that physically connect the motor housing (holding the stator) and the gear case housing (holding the rotor). These ribs ensure that when the housings are assembled, the stator and rotor are automatically aligned coaxially through the geometric constraints provided by the positioning ribs.
Solution Approach 2:
The positioning ribs extend in the radial dimension from the motor housing into the gear case housing, creating a three-dimensional positioning system. This radial extension provides precise location in multiple directions, ensuring coaxial alignment of the rotational components while maintaining structural modularity.
3Ease of operation
If multiple separate housing parts are used, then assembly flexibility is improved, but the number of fastening components and assembly steps increases
Solution Approach 1:
The housing is segmented into two main parts (motor housing and gear case housing) that are joined by a limited number of fastening members. This segmentation provides assembly flexibility for manufacturing and maintenance, while the limited number of joining points keeps the overall component count manageable.
Solution Approach 2:
The positioning ribs are integrated directly into the housing structure rather than being separate components. This merging of the positioning function into the housing itself eliminates the need for additional alignment components, reducing the total number of parts while maintaining assembly flexibility.
Data Source
AI summary
A housing holding a stator has increased rigidity. A vibration driver drill includes a motor including a stator and a rotor rotatable relative to the stator, a gear case in front of the motor, a gear in the gear case to receive rotation of the rotor, an output shaft protruding frontward from the gear case to receive rotation from the gear, an integral cylindrical housing accommodating the motor and including a front portion with an opening and a rear portion closed, a gear case housing connected to the front portion of the integral cylindrical housing and including a right part and a left part and holding the gear case, and a grip housing extending downward from the gear case housing.