Cable Drum Nipple Chamber for Secure Window Lifter Assembly
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Solution Overview
Problem
Existing cable drive devices for vehicle window lifters face challenges in reliable assembly of the traction cable onto the cable drum, particularly in securely inserting the cable nipple into the nipple chamber, leading to assembly errors due to size mismatches and difficulty in automated insertion.
Innovation Solution
The cable drive device incorporates a cable drum with a helical or spiral groove and nipple chambers featuring delimiting elements, such as radial ribs, that securely hold the cable nipple in place through tensile forces, ensuring reliable assembly by allowing the nipple to be tilted and snapped into position, preventing it from sliding out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the nipple chamber is made larger to accommodate the cable nipple, then the cable nipple can be inserted more easily, but the cable nipple may slide out of the nipple chamber during assembly
Solution Approach 1:
The nipple chamber is designed with an asymmetric geometry where the chamber opening is larger than the cable nipple diameter to facilitate insertion, while the chamber bottom features a constricting ring that creates a smaller retention diameter. This asymmetric design allows the cable nipple to be easily inserted through the larger opening while being securely retained by the smaller constricting ring at the bottom, preventing it from sliding out during assembly.
2Productivity
If automated insertion of the cable nipple into the nipple chamber is implemented, then assembly efficiency is improved, but assembly errors occur due to size mismatches between the nipple chamber and cable nipple
Solution Approach 1:
The nipple chamber is pre-configured with a constricting ring that creates a retention zone with a diameter smaller than the cable nipple. This preliminary structural arrangement guides the cable nipple into the correct position during automated insertion, ensuring that the nipple is properly retained once inserted, thereby preventing assembly errors while maintaining high assembly efficiency.
3Reliability
If the cable nipple is securely retained in the nipple chamber, then assembly errors are prevented, but the cable nipple insertion becomes more difficult
Solution Approach 1:
The nipple chamber is segmented into two functional zones: an upper insertion zone with a larger opening diameter that facilitates easy cable nipple insertion, and a lower retention zone with a constricting ring that creates a smaller diameter for secure retention. This segmentation allows the same structure to perform both insertion and retention functions effectively, resolving the contradiction between ease of insertion and reliability of retention.
Data Source
AI summary
A cable drive device of an adjustment system of a motor vehicle has an actuating drive and a cable drive housing in which a cable drum that is rotatably coupled to the actuating drive and has a traction cable wound thereon is received. The cable drum, for receiving a cable nipple fastened to the traction cable, on at least one end side has a nipple chamber having a chamber opening and mutually spaced apart chamber walls. The nipple chamber on at least one of the chamber walls has a delimiting element. The cable nipple when introduced into the nipple chamber by way of the chamber opening engaging below the delimiting element.