Vehicle Window Regulator Guide Rail Pressing Portion
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Solution Overview
Problem
Window regulators face 'bowing deformation' due to reduced thickness and changed cross-sectional profiles of guide rails, which are exacerbated by tension from drive wires and motor torque, leading to instability and potential failure.
Innovation Solution
A window regulator design featuring a guide rail with a wire guide having a winding part offset from the rail, supported by a retainer and pressing portion to prevent movement and deformation, with the pressing portion positioned to counteract tension and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the guide rail is reduced to achieve lighter weight, then the weight of the window regulator is reduced, but the guide rail deforms due to insufficient stiffness
Solution Approach 1:
The guide rail is designed with varying thickness along its length, with the thickest section at the mounting position where stiffness is most needed to prevent bowing deformation, and thinner sections elsewhere to reduce overall weight. This local quality variation allows the guide rail to maintain sufficient stiffness at critical locations while achieving weight reduction overall.
2Device complexity
If the end portions of the guide rail are cut out to arrange wire-guide members and drive wires, then the window regulator structure is simplified, but the section coefficients are reduced causing increased bowing deformation
Solution Approach 1:
The guide rail features a localized thickened section at the mounting position that compensates for the reduced section coefficients caused by cutting out the end portions. This local quality enhancement ensures that the critical mounting area maintains sufficient structural strength and stiffness to prevent bowing deformation, while the overall structure remains simplified.
3Area of stationary object
If the mounting positions of the guide rail are at inner positions from wire guide members, then space within the door is utilized efficiently, but the guide rail deforms upwardly and downwardly from the mounting position
Solution Approach 1:
The guide rail is designed with a thickened section specifically at the mounting position where it attaches to the door panel. This local quality enhancement provides increased stiffness and strength at the mounting location, preventing bowing deformation even when the mounting positions are set at inner positions from the wire guide members for efficient space utilization.
Data Source
AI summary
A vehicle window regulator includes a slider base supported on a guide rail; a drive wire connected to the slider base; a wire guide supported at one end of the guide rail and having a winding part, onto which the drive wire is wound, at a position offset from the guide rail in a vehicle width direction; and a driver which raises and lowers the slider base via the drive wire. The wire guide is supported by the guide rail by a retainer and a pressing portion, the retainer engaged with the guide rail, and the pressing portion being engaged with the guide rail to press the guide rail toward the other end of the guide rail. The pressing portion is formed at a position toward the other end and formed at a position offset from the retainer toward the winding part.