Electric Pump Housing Locking Structure Against Molded-Part Separation
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Solution Overview
Problem
The risk of separation between injection-molded bodies in an electric pump under external forces is a challenge that existing technologies have not adequately addressed.
Innovation Solution
The electric pump design incorporates a housing with a first and second housing, where one of the housings is formed by insert molding with the stator winding as an insert, and includes protrusions and fitting parts in a limiting fit to prevent separation, enhancing the connection strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the housing is formed by multiple injection molding processes, then manufacturing flexibility and material selection are improved, but the risk of separation between injection-molded bodies increases
Solution Approach 1:
The housing is divided into multiple injection-molded bodies that can be manufactured separately with different materials and processes, then assembled together. This segmentation allows each part to be optimized independently while maintaining manufacturing flexibility.
Solution Approach 2:
A protrusion structure is added in the axial direction to create a limiting fit between injection-molded bodies. This dimensional addition prevents separation without compromising the multi-material injection molding benefits.
2Ease of manufacture
If the housing is formed by multiple injection molding processes, then production cost is reduced, but connection strength between housing parts decreases
Solution Approach 1:
The protrusion structure is incorporated into the injection molding process itself, creating the limiting fit feature during manufacturing. This preliminary action ensures strong connection without requiring additional assembly steps or fasteners.
Solution Approach 2:
The protrusion limiting fit structure merges the connection function with the housing structure itself, eliminating the need for separate fastening components and reducing overall production cost while maintaining strength.
3Strength
If the protrusion limiting fit structure is added, then connection strength between housings is improved, but device complexity increases
Solution Approach 1:
The protrusion limiting fit structure is implemented locally at specific connection points between injection-molded bodies rather than throughout the entire housing. This localized approach provides necessary strength without adding overall structural complexity.
Solution Approach 2:
The protrusion structure serves dual purposes: it is part of the normal housing geometry and simultaneously provides the limiting fit function. This self-service design avoids adding separate complexity while achieving the connection strength goal.
Data Source
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Figure 3
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AI summary
An electric pump, comprising a stator winding (131) and a housing (134). The housing (134) comprises a first housing (1341) and a second housing (1342), wherein the first housing (1341) is injection-molded by taking the stator winding (131) as an insert, so as to form a first assembly (136). The second housing (1342) is injection-molded by taking the first assembly (136) as an insert; and the housing (134) comprises a protrusion (1341c) and a fitting portion (1342d). One of the protrusion (1341c) and the fitting portion (1342d) is arranged on the first housing (1341), and the other one is arranged on the second housing (1342). The protrusion (1341c) is in limiting fit with the fitting portion (1342d) in the axial direction of the electric pump (100). In the electric pump, the limiting of the second housing is facilitated, thereby facilitating a reduction in the risk of the first housing being separated from the second housing of the electric pump under an external acting force.