Wiper Pivot Cover Snap-Lock Structure for Dirt and Water Sealing
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Solution Overview
Problem
Conventional rain caps for pivot assemblies in vehicle wiper systems are prone to easy removal due to forces acting during transit and use, leading to exposure of the pivot assembly to water and dirt, which can cause damage and abnormal noise.
Innovation Solution
A cover for the pivot shaft of the pivot assembly, featuring a tubular portion, a cylindrical step, a transition portion, and at least one cantilever snap with a locking profile, is designed to securely lock onto the pivot housing, preventing water and dirt ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional rain cap is fixed to the pivot shaft, then the pivot shaft is covered to prevent water and dirt ingress, but the rain cap rotates with the pivot shaft and can be easily removed from the pivot assembly
Solution Approach 1:
The rain cap is divided into two functional parts: a shaft engagement portion that fits over the pivot shaft, and a housing engagement portion with locking features that secures it to the pivot housing. This segmentation allows the cap to be differentiated between rotating with the shaft and being locked to the housing, preventing accidental removal while maintaining coverage protection.
Solution Approach 2:
The invention merges the rain cap function with additional locking features that engage with the pivot housing. By combining the protective covering function with positive locking mechanisms (such as lugs, tabs, or snap-fit features), the system achieves both water/dirt prevention and secure retention, eliminating the weakness of conventional caps that only covered the shaft.
2Reliability
If the rain cap is designed to be securely locked to prevent easy removal, then retention reliability improves, but device complexity increases
Solution Approach 1:
Instead of making the entire rain cap complex, the invention applies local quality by adding locking features only at specific engagement points with the pivot housing. The majority of the cap structure remains simple and straightforward, with locking lugs or tabs positioned only where needed to engage with corresponding features on the housing, minimizing overall complexity while achieving secure retention.
Solution Approach 2:
The rain cap utilizes a snap-fit or elastic deformation mechanism where flexible portions of the cap can deform during installation and then lock into place. This allows for a simple, lightweight structure that provides secure locking through material flexibility rather than complex mechanical fasteners, reducing overall device complexity.
Data Source
AI summary
The present invention relates to a pivot assembly for a vehicle wiper system. The assembly includes a pivot shaft rotatably supported in central passage of a pivot housing, a lever coupled to the pivot shaft, and a cover. The cover includes a tubular portion, cylindrical step and a transition portion integrally formed between the tubular portion and the cylindrical step. The cover further includes a cantilever snap extending from inner surface of the transition portion, in longitudinal direction of the cover. A protrusion is formed in the cylindrical step at a location adjacent to the snap. The tubular portion of the cover is received over pivot shaft and a locking profile formed at free end of the snap is received in a recess formed in top end of the pivot housing, thereby restricting longitudinal and rotational movements of the cover with respect to the pivot housing.