Tool Chuck Clutch Mechanism Torque Limiting
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Solution Overview
Problem
Conventional keyless tool chucks experience inconsistent torque application during chuck actuation, leading to issues like under-tightening, over-tightening, and potential damage to transmission elements due to variable operator force and high-speed impacts.
Innovation Solution
A tool chuck design featuring a clutch mechanism with cooperating clutch parts that selectively engage and disengage to limit torque, allowing for uniform torque application and differentiation between tightening and loosening thresholds, thereby preventing excessive force and ensuring consistent accessory retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If operator manipulates the sleeve with high force, then chuck actuation torque increases, but risk of over-tightening and transmission element damage increases
Solution Approach 1:
The clutch mechanism changes the torque parameter by engaging at a predetermined torque threshold, converting unlimited operator force into a capped, controlled torque application that prevents over-tightening while still allowing sufficient tightening force
Solution Approach 2:
The clutch mechanism acts as an intermediary between the operator's manual torque input and the chuck jaw actuation, mediating the force transmission by engaging friction surfaces to limit maximum torque and protect transmission elements from excessive forces
2Object-affected harmful factors
If operator manipulates the sleeve with low force, then transmission element damage is reduced, but chuck may be under-tightened causing accessory slippage
Solution Approach 1:
The clutch mechanism establishes a minimum effective torque threshold for reliable accessory retention by providing consistent torque multiplication through the friction engagement, ensuring that even moderate operator input produces sufficient tightening force
3Manufacturing precision
If clutch mechanism is added to limit torque, then torque consistency improves, but device complexity increases
Solution Approach 1:
The clutch mechanism is segmented into separate, modular components including the clutch sleeve with friction surfaces, clutch keys, and spring-loaded actuators, allowing the complex torque-limiting function to be achieved through simple, discrete parts that can be manufactured and assembled using conventional processes
Data Source
AI summary
A tool chuck may include a chuck body defining a longitudinal axis. A sleeve may be mounted on the chuck body and axially fixed relative to the chuck body. A clutch part may be provided on the sleeve. The clutch part may interact with a cooperating clutch part mounted on the power driver housing. The cooperating clutch part may be mounted on the power driver housing for movement between a first axial position in which the chuck body is rotatable together with the sleeve, and a second axial position in which the chuck body is rotatable relative to the sleeve to actuate the tool chuck. The chuck body may be rotatable in a first direction to actuate the tool chuck up to a first torque threshold, and rotatable in a second direction to actuate the tool chuck up to a second, different torque threshold.