Window Lift Cable Drum Stop Ring Design
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Solution Overview
Problem
Existing drive devices for vehicle parts, such as power window actuators, face challenges in assembly complexity and operational stability, particularly in maintaining the cable drum's position and preventing rotation of the cable exit housing during operation.
Innovation Solution
A drive device design featuring radially projecting bearing elements on the cable drum that engage with a counter bearing on the carrier element, combined with a latch-fit connection between the cable exit housing and carrier element, ensures secure assembly and prevents rotational movement of the cable exit housing, utilizing a single fastening element for axial bracing and maintaining wet/dry space separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cable drum is inserted through the opening of the carrier element, then the cable drum can be mounted on the carrier element, but the cable drum may slip through the opening during operation
Solution Approach 1:
The cable drum is divided into two functional parts: a first portion that inserts through the opening for mounting, and a second portion with bearing elements that engage the counter bearing to prevent slipping. This segmentation allows the cable drum to serve both assembly and operational retention functions.
Solution Approach 2:
The solution moves from a one-dimensional insertion through the opening to a two-dimensional engagement system by adding bearing elements that project radially outward to engage the counter bearing. This dimensional extension prevents the cable drum from slipping through the opening while maintaining assembly simplicity.
2Ease of manufacture
If the cable exit housing is mounted on the carrier element, then the cable drum can be enclosed and held, but the cable exit housing may rotate during operation
Solution Approach 1:
The cable exit housing features an asymmetric latch-fit connection design with a latch element that engages a corresponding feature on the carrier element. This asymmetric geometry prevents rotation in one direction while allowing simple attachment, ensuring operational stability without complicating assembly.
3Reliability
If multiple fastening elements are used to secure the cable drum and cable exit housing, then position stability and rotational stability are improved, but assembly complexity increases
Solution Approach 1:
The cable drum's bearing elements and the cable exit housing's latch element are integrated into the respective components themselves rather than being separate fastening elements. This merging reduces the total number of parts while maintaining position stability and rotational stability through the functional geometry of the cable drum and cable exit housing.
Data Source
AI summary
A power window actuator includes a carrier element having an opening, a cable drum includes a portion is inserted into the opening of the carrier element in such a manner that the portion at least partially extends through the opening, and a cable exit housing disposed on a first side of the carrier element includes a bearing element supporting the cable drum on the first side of the carrier element so as to be rotatable about a rotation axis. At least one bearing element projects radially with respect to the rotation axis from the portion, the bearing element engaging a counter bearing on a periphery of the carrier element surrounding the opening of the carrier element.