Resilient Spindle Lock Assembly for Torque Shock Reduction
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Solution Overview
Problem
Conventional power tool spindle lock designs experience abrupt seizing when transitioning to a locked state, causing undesirable jerking forces, reducing the operating-life cycle of the chuck assembly and tool bits, and leading to increased wear and noise.
Innovation Solution
Incorporation of a spindle lock assembly with resilient members that absorb torque impulses during the transition from an unlocked to a locked state, reducing the abruptness of the locking mechanism and minimizing jerking forces transmitted to the operator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional spindle lock design is used, then the locking mechanism is simple, but abrupt seizing occurs causing jerking forces and reduced operating life
Solution Approach 1:
A resilient member is positioned between the gearcase ring and gearcase to absorb torque impulses before they are transmitted to the chuck assembly and tool bit. The resilient member deforms under torque loading, cushioning the abrupt seizing that occurs during locking state transitions and preventing jerking forces from reaching the operator and damaging components.
2Object-affected harmful factors
If the spindle lock assembly uses resilient members to absorb torque impulses, then wear and noise are reduced, but the device complexity increases
Solution Approach 1:
The resilient member serves as an intermediary element positioned between the gearcase ring and gearcase. It mediates the torque transmission by absorbing impulses through elastic deformation, thereby reducing wear on the chuck assembly and tool bit while minimizing noise. The intermediary resilient member protects the system from direct torque shocks without requiring major structural changes.
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 resilient members in the spindle lock assembly reduce wear on the chuck assembly and tool bits, minimize noise, and enhance operator comfort by absorbing torque impulses, thereby improving the durability and operational life of the power tool components.
Implementation Method 1
The first resilient member is configured to at least partially absorb a torque impulse from the output spindle when rotating in a first direction and when the spindle lock assembly transitions from the unlocked state to the locked state
Implementation Method 2
The first and second resilient members are configured to at least partially absorb a torque impulse from the output spindle when rotating, respectively, in a forward direction and a reverse direction, when the spindle lock assembly transitions from the unlocked state to the locked state
Data Source
AI summary
A power tool includes a housing, a motor supported by the housing, and an output spindle rotatably supported relative to the housing about an axis. The motor is operable to drive the output spindle about the axis. The power tool includes a spindle lock assembly between the motor and the output spindle. The spindle lock assembly is adjustable between an unlocked state in which the output spindle is rotatable relative to the housing about the axis and a locked state in which the output spindle is rotationally fixed relative to the housing. The spindle lock assembly includes a first resilient member, positioned between the housing and the output spindle. The first resilient member is configured to at least partially absorb a torque impulse from the output spindle when rotating in a first direction and when the spindle lock assembly transitions from the unlocked state to the locked state.