Cable Tensioner Pawl Support Structure for Window Lifters
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Solution Overview
Problem
The durability of the pawl in existing window lifting devices is compromised due to the strong forces exerted by the cable, leading to operation failures and potential breakage.
Innovation Solution
A reinforced pawl structure is implemented, featuring a hook portion that snaps onto ratcheting notches and is supported by an inner cylinder to withstand the forces, with a spring providing preload to maintain the position and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pawl structure is used in the cable tensioner, then the cable tension can be maintained through ratcheting notches, but the pawl is easily broken under strong cable force and has poor durability
Solution Approach 1:
The pawl and outer cylinder are merged into a single integrated component. The pawl is formed as an integral part of the outer cylinder, eliminating the need for separate pawl components and their associated fastening elements. This merging strengthens the overall structure by removing potential weak points at connection interfaces and ensures the pawl maintains structural integrity under high cable tension forces.
Solution Approach 2:
The outer cylinder (and integrated pawl) is constructed from a composite material or structure that combines high strength and toughness properties. This allows the pawl to withstand the strong forces exerted by the cable during window operation while maintaining durability and resistance to breaking.
2Reliability
If the pawl is made stronger to withstand cable force, then durability improves, but the device complexity increases
Solution Approach 1:
The pawl and outer cylinder are merged into a single integrated component. The pawl is formed as an integral part of the outer cylinder, eliminating the need for separate pawl components and their associated fastening elements. This merging strengthens the overall structure by removing potential weak points at connection interfaces and ensures the pawl maintains structural integrity under high cable tension forces.
3Device complexity
If the cable tensioner is designed with a simple pawl structure, then device complexity is reduced, but the pawl breaks easily under operation
Solution Approach 1:
The pawl and outer cylinder are merged into a single integrated component. The pawl is formed as an integral part of the outer cylinder, eliminating the need for separate pawl components and their associated fastening elements. This merging strengthens the overall structure by removing potential weak points at connection interfaces and ensures the pawl maintains structural integrity under high cable tension forces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The reinforced pawl structure effectively prevents breakage, ensuring reliable operation of the cable tensioner and window lifting device by maintaining the position of the regulating stick relative to the tube assembly, even under strong cable forces.
Implementation Method 1
a spring arranged to surround the outer cylinder and clamped with preload between the first abutting portion and the second abutting portion
Implementation Method 2
the ratchet rack has a plurality of ratcheting notches, and each of the ratcheting notches has a stopping surface and a slope disposed therein and opposite to each other
Data Source
AI summary
This disclosure is directed to a cable tensioner having a regulating stick, a tube assembly and a spring. The regulating stick has an abutting portion and a ratchet strip. The ratchet strip has multiple ratcheting notches having a stop surface and a slope opposite to each other. The tube assembly sleeving the regulating stick has an outer cylinder and an inner cylinder. The outer cylinder has A second abutting portion and a pawl. The pawl has an elastic arm and a hook portion. The hook portion has a stopping side abutting against the stop surface. The hook portion engages one of the ratcheting notches. The spring is preloaded and clamped between the first and second abutting portions. One end of the inner cylinder abuts a side of the hook portion opposite to the stopping side.