Screw rod self-locking device, and height-adjustable leg and height-adjustable desk applying the same
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Solution Overview
Problem
Existing height-adjustable desks with self-locking mechanisms have insufficient self-locking force and inconsistent friction forces due to unadjustable friction between one-way bearings and bearing seats, leading to inconsistent product performance.
Innovation Solution
A screw rod self-locking device with an adjustable one-way bearing and mounting seat structure, where the one-way bearing is fitted into an arc-shaped mounting hole with adjustable locking force, allowing for customization of friction resistance and consistent performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a one-way bearing is used to realize self-locking, then the self-locking force is improved, but the friction force between the bearing and bearing seat becomes un-adjustable and inconsistent
Solution Approach 1:
The bearing seat is designed with an adjustable structure that allows the friction force between the one-way bearing and bearing seat to be dynamically adjusted after assembly. This enables the self-locking force to be customized according to different application requirements, resolving the contradiction between achieving sufficient self-locking force and maintaining adjustability.
Solution Approach 2:
The patent introduces an adjusting mechanism that changes the friction parameter between the bearing and bearing seat. By modifying the contact pressure or surface properties through the adjusting mechanism, the friction force can be precisely controlled to achieve consistent and adjustable self-locking performance.
2Ease of manufacture
If standard one-way bearings are mounted in fixed bearing seats, then assembly is simplified, but the friction force cannot be adjusted according to user requirements
Solution Approach 1:
The bearing seat incorporates an adjusting mechanism that allows post-assembly adjustment of the friction force. This maintains the simplicity of initial assembly while enabling customization of the friction parameter to meet different user requirements, effectively resolving the contradiction between ease of manufacture and adaptability.
3Ease of manufacture
If one-way bearings are assembled with standard tolerances, then manufacturing is easier, but the reversing friction forces become inconsistent due to unequal tolerances
Solution Approach 1:
The adjusting mechanism provides a feedback loop that allows measurement and adjustment of the friction force after assembly. By measuring the actual friction force and adjusting the bearing seat parameters, the system compensates for tolerance variations, achieving consistent friction force without requiring tight manufacturing tolerances.
Solution Approach 2:
The patent uses the adjusting mechanism to change the friction parameter to compensate for tolerance-induced variations. This allows standard tolerance manufacturing while achieving consistent friction force through parameter adjustment rather than relying solely on precise manufacturing.
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 adjustable friction resistance ensures consistent product performance by allowing customization of the reverse driving force required, maintaining consistent friction resistance and driving force needs across products.
Implementation Method 1
a friction force between an outer wall of the one-way bearing and an inner wall of a mounting hole
Data Source
AI summary
A screw rod self-locking device includes a one-way bearing and a mounting seat, and an inner hole of the one-way bearing is sleeved at an end of a screw rod. A mounting hole for receiving the one-way bearing is disposed on the mounting seat, and the one-way bearing is rotatably fitted into the mounting hole along a circumferential direction. An adjusting mechanism for adjusting a circumferential locking force of the mounting hole for the one-way bearing is disposed on the mounting seat so as to adjust a size of a friction force between an outer wall of the one-way bearing and an inner wall of the mounting hole. A height-adjustable leg and a height-adjustable desk applying the same are further provided. In this way, a size of a self-locking friction force to be overcome during backward rotation of a screw rod can be self-defined, thereby guaranteeing consistency of product performances.