Motor Connector Through Hole for Mold Sealability
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Solution Overview
Problem
The existing motor designs face challenges in maintaining sealability between the connector portion and external power supplies due to unevenness caused by welding mold pins, which reduces the rigidity of the mold and affects the mold's thickness, leading to potential sealability issues.
Innovation Solution
The motor design incorporates a through hole in the connector portion with the air hole positioned inside the outer edge of the external connection terminal group, allowing the mold pin to be inserted without welding, thus maintaining mold thickness and preventing unevenness, ensuring improved sealability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mold pin is fixed to the mold body portion by welding, then the air hole can be formed near the outer edge of the connector portion, but unevenness occurs on the mold body portion and molded connector portion, deteriorating sealability
Solution Approach 1:
The invention divides the mold pin into two separate parts: a pin body portion and a head portion. The pin body portion is inserted into a concave portion of the mold body, while the head portion extends into the molding space. This segmentation allows the air hole to be formed near the outer edge without welding, eliminating surface unevenness while maintaining manufacturability.
Solution Approach 2:
The pin body portion is inserted into and nested within the concave portion of the mold body. This nesting structure provides secure positioning and support for the mold pin without requiring welding, thereby preventing unevenness on the mold surface while enabling air hole formation near the outer edge.
2Manufacturing precision
If the mold pin is inserted into the concave portion of the mold body, then welding is avoided and unevenness is reduced, but the thickness of the mold body area becomes thinner, reducing mold rigidity
Solution Approach 1:
The concave portion is strategically positioned in an area of the mold body where the thickness is sufficient to maintain rigidity. By localizing the concave portion insertion in a structurally sound area, the mold pin can be secured without welding while preserving overall mold rigidity. The head portion of the pin provides additional structural support in the molding space.
Solution Approach 2:
The mold pin structure extends into the molding space with its head portion, utilizing the third dimension (depth into the mold) to provide structural reinforcement. This dimensional extension compensates for the localized thinning at the concave portion insertion point, maintaining overall mold rigidity without welding.
Data Source
AI summary
A motor may include a motor body portion; a connector portion disposed to the motor body portion; and a wiring member electrically connected to the motor body portion. The connector portion has a surface exposed to an outside of the motor body portion. The wiring member includes a plurality of external connection terminals which are connected to the external power supply to protrude from the exposed surface of the connector part. The connector portion is provided with a through hole which extends from the exposed surface toward the accommodating space and connects the outside of the motor body portion and the accommodating space. When viewed in the normal direction of the exposed surface, at least a portion of the through hole is positioned inside an edge of an external connection terminal group which consists of the plurality of external connection terminals.