Motor Pump Housing Connection via Segmented Caulking
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Solution Overview
Problem
Existing pump with motor connecting structures face challenges in caulking workability due to high reaction forces on connecting pieces, leading to increased manufacturing costs and complexity from multiple compression molding processes.
Innovation Solution
A pump with a motor housing made of metal and a pump housing made of plastic, featuring a connecting structure with through holes and projections that allow for easier caulking of connecting pieces, reducing the load on these pieces and simplifying the compression molding process by distributing the reaction force through additional projections and holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connecting pieces are firmly formed to withstand rotation reaction forces, then reliability is improved, but ease of manufacture deteriorates due to low caulking workability
Solution Approach 1:
The connecting structure is segmented into multiple components: connecting pieces for radial connection, projections for axial connection, and through holes for alignment. This segmentation allows each component to handle specific forces independently, enabling easier caulking while maintaining reliability
Solution Approach 2:
The invention adds projections that extend in the axial direction (another dimension) to complement the radial connecting pieces. This dimensional addition distributes reaction forces across multiple directions, reducing the load on connecting pieces and improving caulking workability
2Manufacturing precision
If multiple compression molding processes are used to form the motor housing, then manufacturing precision is improved, but manufacturing cost increases
Solution Approach 1:
The invention merges the forming of connecting pieces and projections into a single compression molding process. The motor housing is designed with integrated features that can be formed in one molding cycle, eliminating the need for separate press working operations and reducing manufacturing cost
Solution Approach 2:
The compression molding process is made multi-functional by designing the motor housing to form both the bearing storage portion and the connecting structure features (connecting pieces and projections) in a single operation, reducing the number of manufacturing steps
Data Source
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AI summary
A pump with a motor includes a pump housing, a motor housing, and a connecting structure configured to connect the motor housing to the pump housing. The connecting structure includes a motor connecting portion provided at an end of the pump housing, and a pump connecting portion provided at an end of the motor housing. The motor connecting portion includes a bearing configured to rotatably support the other end of the rotating shaft (15) whose one end supported by the motor housing, a plurality of through holes, and projections projecting to the side of the motor housing. The pump connecting portion includes a first hole in which the bearing is fitted, a plurality of connecting pieces inserted into the plurality of through holes, respectively, and caulked on the motor connecting portion, and second holes in which the projections are fitted.