Roller Unit Cable Attachment Guide Pin Recess
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Solution Overview
Problem
Existing roller devices for power slide doors require a longer cable length due to the need to rotate the cable end by 90 degrees during attachment, leading to an increased work stroke and potential wear issues.
Innovation Solution
A roller unit design featuring a guide pin with a recessed leading end and a fastener that includes a supporting part and a protrusion for engaging with the recess, allowing the cable end to be attached without rotating, thus reducing the required cable length and preventing direct sliding contact between the guide pin and cable end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cable end is attached to the pin by rotating it 90 degrees, then secure engagement is achieved, but the cable length must be increased
Solution Approach 1:
Instead of rotating the cable end to engage with the pin, the invention inverts the approach by making the pin rotate or align automatically with the cable end through the recess structure. The recess at the leading end of the pin allows the pin to orient itself perpendicular to the cable axis during insertion, eliminating the need for 90-degree rotation of the cable end and reducing the required cable work stroke.
Solution Approach 2:
The recess structure acts as an intermediary mechanism that facilitates engagement between the cable end and pin. By providing a recessed leading end on the pin, the design creates an intermediate geometric feature that guides the cable end into proper alignment and enables secure attachment without requiring additional rotation movement of the cable.
2Manufacturing precision
If the cable end rotates 90 degrees during attachment, then proper positioning is achieved, but the work stroke is increased
Solution Approach 1:
The invention reverses the traditional attachment sequence where the cable end rotates to match the pin orientation. Instead, the pin's recessed leading end automatically orients itself during insertion, achieving proper positioning without requiring the cable end to undergo 90-degree rotation, thereby reducing attachment time and improving efficiency.
Solution Approach 2:
The recess structure is pre-formed on the pin before attachment occurs. This preliminary geometric configuration ensures that when the cable end is inserted, the pin is already positioned and oriented correctly to receive the cable end, eliminating the need for time-consuming rotation adjustments during the attachment process.
3Device complexity
If the guide pin and cable end have direct sliding contact, then simple structure is maintained, but wear increases
Solution Approach 1:
The recessed leading end of the guide pin serves as an intermediary surface that modifies the contact mechanics between the pin and cable end. By creating a recessed geometry, the design distributes contact stresses more evenly and reduces direct sliding friction, thereby minimizing wear while maintaining the overall simplicity of the attachment structure without introducing additional components.
Data Source
AI summary
A roller unit to which a cable end of a cable pulled by a door actuator is attached moves with a slide door along a guide rail on a vehicle body, and includes: a coupling part coupled to the slide door; a guide roller supported by the coupling part and moving along the guide rail; a guide pin fixed to the coupling part and inserted into the cable end; and a fastener fastening the cable end to the guide pin. A recess is formed toward an end of the guide pin. An external diameter of the end of the guide pin is smaller than an internal diameter of the shaft hole of the cable end. The fastener includes a supporting part supporting the cable end and a protrusion part engaged with the recess.