Infinitely Variable Wrench Anti-Rotation Mechanism
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Solution Overview
Problem
Bearing-type wrenches are prone to deformation and slippage under high torque conditions due to the outward force applied by roller bearings, which inhibits rotation and can cause the wrench housing to move or slip.
Innovation Solution
An anti-rotation mechanism with a reversible, bearing-type clutch featuring coaxial races with convoluted configurations and rollers that engage with a line of contact to prevent relative rotation, along with a direction switching mechanism using a control plate and prongs to allow selective rotation in either direction or lock, preventing deformation by distributing forces effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If roller bearings are used to inhibit rotation, then rotational control is improved, but the wrench housing deforms and slippage occurs under high torque
Solution Approach 1:
A hardened steel insert is introduced as an intermediary component between the roller bearing and the wrench housing. This insert absorbs and distributes the outward radial forces generated by the roller bearing, preventing these forces from deforming the housing. The insert acts as a force mediator that protects the housing structure while maintaining the rotational control function of the bearing.
Solution Approach 2:
The contact interface parameters are changed by replacing the direct bearing-to-housing contact with bearing-to-insert contact. The insert has optimized surface properties and geometric parameters that allow it to withstand high radial loads without causing housing deformation, thereby changing the force transmission parameters in the system.
2Ease of operation
If ratchet teeth are used for unidirectional rotation, then rotation control is achieved, but the angular rotation steps are limited and discrete
Solution Approach 1:
The traditional ratchet tooth mechanism is replaced with a roller bearing-based friction control system. Instead of discrete mechanical engagement points, the roller bearing provides continuous frictional contact that can accommodate any angular rotation increment. This substitution transitions from a discrete mechanical engagement system to a continuous friction-based control system, enabling infinitely variable rotation steps.
Solution Approach 2:
The system transitions from static ratchet tooth engagement to dynamic roller bearing friction control. The roller bearing can adapt its engagement characteristics based on the applied load and rotation direction, providing dynamic rotation control rather than fixed discrete steps. This allows the system to respond continuously to operational requirements.
3Adaptability or versatility
If bearing-type clutch is used for reversible operation, then bidirectional control is improved, but silent operation and infinite engagement points are achieved
Solution Approach 1:
The noisy mechanical tooth engagement of traditional ratchets is replaced with silent friction-based roller bearing contact. The roller bearing provides smooth, quiet operation by distributing contact forces continuously across its surface, eliminating the discrete clicking noises associated with tooth engagement. This substitution achieves silent operation while maintaining bidirectional control capability.
Solution Approach 2:
The engagement mechanism changes from discrete tooth-to-pawl contact to continuous roller-to-raceway friction contact. This parameter change in the contact mechanism eliminates the impact and vibration that cause noise, while the hardened steel insert further reduces noise by providing a stable, vibration-damping interface.
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 mechanism operates silently with an infinite number of engagement points, ensuring the driver is instantly engaged and preventing deformation of the wrench housing, allowing for smooth operation under high torque conditions without slippage.
Implementation Method 1
The rollers each have a line of contact that engages a side of the protrusion and inhibits relative rotation between the two races
Implementation Method 2
The rollers are biased toward the protrusions
Data Source
AI summary
Apparatus for an anti-rotation mechanism, such as used in a wrench. The space between a pair of races contains a plurality of pairs of rollers. One race has a protrusion centered inside each pair of rollers, with the rollers biased against the protrusion. Adjacent the protrusion and between the rollers of each pair is a prong that selectively biases one or the other of the rollers of the pair away from the protrusion. When one roller in the pair of rollers is biased away from the corresponding protrusion, relative motion between the pair of races is enabled in only one direction. The protrusions extend into the space between the pair of races sufficiently to prevent the rollers from moving under load when relative motion is inhibited.