One-Way Clutch for Handled Tool with Planetary Torque Amplification
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Solution Overview
Problem
Existing clamping structures for handled tools, such as drill chucks, face issues with high contact stress and friction between jaws and nuts, leading to inadequate clamping force under heavy loads and vibrations, and suffer from unreliable pawl disengagement, resulting in teeth scraping between the pawl and ratchets.
Innovation Solution
A one-way clutch mechanism with a ratchet member, pawl seat, and control outer sleeve, where the pawl engages and disengages from the ratchet using a resilient member and control portion, ensuring complete disengagement and avoiding half-disengagement states, and a planetary transmission mechanism enhances torque and clamping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the thread between jaws and nut is used for clamping, then the structure is simple, but the contact stress and friction are very large leading to insufficient clamping force under heavy load
Solution Approach 1:
The patent introduces a planetary transmission mechanism as an intermediary between the control outer sleeve and the jaws. The planetary gears amplify the torque applied to the jaws, enabling sufficient clamping force under heavy loads while maintaining a relatively simple overall structure. The control outer sleeve rotates the planetary carrier, which in turn rotates the jaws through gear engagement.
Solution Approach 2:
The patent employs a one-way clutch mechanism with resilient pawls that dynamically engage and disengage based on operational needs. During clamping, the pawls engage with ratchets to lock the jaws in position. During release, the resilient pawls automatically disengage when the control outer sleeve rotates in the reverse direction, eliminating the need for complex reverse-threaded sections.
2Ease of operation
If the control outer sleeve rotates to disengage the pawl, then the release function is achieved, but the incomplete disengagement causes pawl and ratchet teeth to scrape
Solution Approach 1:
The resilient pawls dynamically respond to the rotation direction of the control outer sleeve. When rotated in the release direction, the pawls are forced to lift off the ratchets completely due to the resilient bias and geometric design of the disengagement surface, ensuring no partial engagement remains and preventing teeth scraping during subsequent re-clamping.
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 solution effectively prevents teeth scraping by ensuring reliable pawl disengagement and provides a higher tightening torque, enabling secure clamping and release of tool handles even under heavy loads and vibrations.
Implementation Method 1
at least one of the control portion or the pawl member has a first surface which may be in contact with the other one of the control portion or the pawl member such that the pawl member exerts a force towards the second direction onto the control portion
Data Source
AI summary
The present invention discloses a one-way clutch capable of eliminating the phenomenon of “teeth scraping”, comprising: ratchet member, pawl seat, pawl member, control outer sleeve and control member provided with control portion, wherein at least one of the control portion or the pawl member has a first slope capable of being in contact with the other one of the control portion or the pawl member and said pawl member exerts a force towards the second direction on the control portion.