Lathe Chuck Shifter Mechanism With Roller to Reduce Wear
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Solution Overview
Problem
The shifter and claw in existing lathe chucking mechanisms experience wear due to friction, and the shifter bearing wears quickly due to heat generated when it contacts the side surfaces of the outward groove during operation.
Innovation Solution
A lathe design that includes a chuck operating apparatus with a tilt claw and a shifter, where the shifter bearing is kept separated from the side surfaces of the outward groove by using a roller to reduce friction and wear, and by positioning the shifter bearing to touch only one side surface during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shifter bearing is kept in contact with the side surface of the outward groove during operation, then the shifter bearing rotates faster and can maintain positioning, but the shifter bearing wears quickly due to heat generated from friction
Solution Approach 1:
A roller is introduced as an intermediary element between the shifter and the claw. The roller receives the pushing force from the shifter and transmits it to the claw, eliminating direct contact and friction between the shifter bearing and the groove side surface. This mediator reduces wear and heat generation while maintaining the positioning function.
Solution Approach 2:
The direct sliding contact mechanical system between the shifter bearing and the groove side surface is replaced with a rolling contact system using the roller. This substitution reduces friction and wear, allowing the shifter bearing to maintain positioning accuracy without rapid degradation from heat-generated friction.
2Device complexity
If the shifter and claw are in direct contact to transmit force, then the chucking mechanism operates simply, but the shifter and claw wear due to repeated rubbing
Solution Approach 1:
The roller serves as a mediator between the shifter and the claw, replacing direct contact with rolling contact. This simple intermediary element significantly reduces wear on both the shifter and claw while maintaining the force transmission function, thereby extending their service life without substantially increasing device complexity.
3Duration of action of stationary object
If the shifter bearing is separated from both side surfaces of the outward groove when the shifter is not activated, then wear is reduced, but the shifter bearing must be precisely positioned to maintain separation
Solution Approach 1:
The roller acts as a mediator that takes over the force transmission function, allowing the shifter bearing to be separated from both side surfaces of the outward groove. This separation reduces wear on the shifter bearing, and the roller ensures proper positioning without requiring high manufacturing precision for the shifter bearing itself.
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 design elongates the life of the shifter bearing by reducing friction and wear, and simplifies maintenance by allowing for easier replacement of parts, such as the roller, without needing to replace the entire shifter.
Implementation Method 1
A roller is provided on one of the claw and the shifter in a contact position with the other to roll in the direction of the spindle axis
Data Source
AI summary
A chuck operating apparatus includes a claw, a shifter, and a shifter drive unit. The rotatable claw has a first posture to bring the chuck into the opened state and a second posture to bring the chuck into the closed state. The rotatable shifter is brought in a first position to bring the claw into the first posture and in a second position to bring the claw into the second posture. The shifter drive unit has a shifter lever having an insertion part provided with a shifter bearing capable of being brought into contact with a side surface of an outward groove of the shifter. A roller is provided on one of the claw and the shifter in a contact position with the other to roll in a spindle axis direction and a groove is formed on the other to receive the roller when the chuck is in the opened state.