Wiper Motor Gearbox Latching With Integrated Rotational Centering
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Solution Overview
Problem
Existing wiper motors require additional centring means that occupy installation space and material, complicating the mounting process and increasing component count.
Innovation Solution
The centring means are integrated into the latching connections, with specific geometric arrangements of bearing faces on latching elements to ensure rotational angle play-free mounting without additional space or components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate centring means are provided in addition to latching connections, then rotational angle play-free arrangement is achieved, but device complexity and material requirements increase
Solution Approach 1:
The patent combines the centring function and latching function into a single integrated latching connection system. The bearing faces on the latching elements perform both centring (aligning rotational angle) and latching (securing positional connection) functions simultaneously, eliminating the need for separate centring pins or openings and reducing overall device complexity
Solution Approach 2:
The latching elements are designed to serve multiple functions: they provide mechanical latching to secure the gearbox cover to the housing, and simultaneously provide centring through their bearing face geometry. This multi-functionality reduces the total number of components needed while achieving both positioning precision and secure attachment
2Manufacturing precision
If additional centring means are provided, then rotational angle play-free arrangement is achieved, but installation space requirement increases
Solution Approach 1:
The centring function is merged into the existing latching connection structure. The bearing faces on the latching elements are geometrically configured to provide centring action without requiring separate centring pins, openings, or additional installation space on the gearbox housing or cover
3Manufacturing precision
If bearing faces are arranged on the same side of latching elements, then rotational angle play-free connection is achieved, but latching element design complexity increases
Solution Approach 1:
The bearing faces are positioned at specific locations on the latching elements (on the same side) to create the necessary geometric constraints for rotational angle play-free connection. This localized geometric feature provides precise centring while keeping the overall latching element design relatively simple and manufacturable
Data Source
Figure 1~2
Figure 3~5
AI summary
The invention relates to a wiper motor (10), having a gearbox housing (12) which comprises a preferably pot-shaped main body (16) for forming a receiving space (22) for a gear mechanism, wherein an opening (18) in the main body (16) can be closed by a gearbox cover (20), wherein a plurality of latching connections (30, 31, 32), which act in the direction of a joining direction (28) between the main body (16) and the gearbox cover (20), are formed between the main body (16) and the gearbox cover (20) and each comprise an elastically deformable first latching element (36, 37, 58) and a second latching element (49, 50, 60) which interacts with the first latching element (36, 37, 58) in a form-fitting manner, and wherein centring means (55) are provided on the gearbox housing (12) for the play-free positioning of the gearbox cover (20) relative to the main body (16) in a rotational angle position, which extends perpendicularly to the joining direction (28), between the main body (16) and the gearbox cover (20).