DC Motor Brush Base Locking via Centred Coupling
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Solution Overview
Problem
The assembly of direct current electric motors with brushes is laborious and time-consuming due to the need for multiple screws and locking rings, which does not meet current market requirements for quick assembly.
Innovation Solution
The brush-carrying base is locked directly between the cap and the stator using centred coupling means on the cap, eliminating the need for additional connection members and allowing for precise blocking without extra assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple screws and locking rings are used to fix the brush-carrying base, then the connection strength and reliability are improved, but the assembly time and operational complexity increase
Solution Approach 1:
The patent combines multiple fastening functions into a single integrated spring clip that simultaneously provides both connection and locking functions. The spring clip engages with the cap and brush-carrying base in one piece, eliminating the need for separate screws and locking rings, thus reducing assembly steps while maintaining connection reliability
Solution Approach 2:
The invention extracts and eliminates unnecessary intermediate connection elements (screws and locking rings) by using a direct spring clip mechanism that attaches the brush-carrying base to the cap without requiring these additional components, thereby simplifying the assembly process
2Strength
If multiple connection members are used to secure the brush-carrying base, then the mechanical strength of the connection is improved, but the device complexity and number of parts increase
Solution Approach 1:
The spring clip integrates both the connection function (attaching to the cap) and the securing function (locking the brush-carrying base) into a single component, eliminating the need for multiple separate connection members and reducing overall device complexity
Solution Approach 2:
The spring clip serves multiple functions simultaneously: it acts as both a connector and a locking mechanism, and its elastic properties provide both mechanical strength and ease of assembly, demonstrating multi-functionality that reduces the total number of parts needed
3Manufacturing precision
If traditional screw fixation is used for the brush-carrying base, then the precision of positioning is improved, but the ease of assembly and disassembly deteriorates
Solution Approach 1:
The spring clip utilizes its own elastic properties to automatically position and secure the brush-carrying base without requiring additional alignment tools or complex assembly procedures, achieving both precision and ease of assembly through self-service characteristics
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
Direct current electric motor, comprising a stator (2; 102; 202; 302), a rotor (3; 103; 203; 303) able to rotate inside the stator (2; 102; 202; 302) and a brush-carrying cap (4; 104; 204; 304) with which a brush-carrying base (13; 113; 213; 313) for feeding said rotor (3; 103; 203; 303) is coupled, characterised in that said brush-carrying base (13; 113; 213; 313) is locked in a pack between said stator (2;102; 202; 302) and said cap (4; 104; 204; 304), said cap (4; 104; 204; 304) being provided with centred coupling means (14; 114; 214; 314) with said stator (2;102; 202; 302) in which peripheral portions (15; 115; 215; 315) of said base (13; 113; 213; 313) engage.