Coil Spring Pulley Structure for Stable One-Way Clutch Wear
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Solution Overview
Problem
The pulley structure with a coil spring clutch experiences abnormal wear in the clutch engagement portion due to sliding, leading to decreased torque transmission and reduced lifespan, as conventional configurations fail to stabilize the coil spring's posture and maintain uniform surface pressure during disengagement.
Innovation Solution
A pulley structure with a coil spring having a specific number of windings within the range of M-0.125 to M, or more preferably M-0.069 to M, to stabilize the coil spring's posture and prevent moment-induced incline, ensuring uniform surface pressure during disengagement and reducing wear by controlling torsional torque between 1 N·m and 10 N·m.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil spring is used as a one-way clutch to transmit or block torque, then the belt slipping is prevented, but the clutch engagement portion wears due to sliding when the clutch is disengaged
Solution Approach 1:
The invention changes the physical parameters of the coil spring, specifically setting the number of windings to a precise range (M-0.125 to M where M is a natural number) and controlling the torsional torque within 1 N·m to 10 N·m. These parameter adjustments optimize the spring's mechanical behavior to prevent abnormal wear while maintaining reliable torque transmission and blocking functions.
2Power
If the coil spring is compressed in the axial direction between the outer rotating body and the inner rotating body, then torque transmission is enabled, but the posture of the coil spring becomes unstable causing moment-induced incline and non-uniform surface pressure
Solution Approach 1:
The invention optimizes the coil spring's geometric parameters, specifically the number of windings (M-0.125 to M), to achieve optimal balance between torque transmission capability and posture stability. This parameter optimization prevents moment-induced incline and ensures uniform surface pressure distribution during operation.
3Power
If the number of windings of the coil spring is increased, then the torque transmission capability is improved, but the coil spring posture becomes less stable increasing wear
Solution Approach 1:
The invention identifies and implements an optimal range for the number of windings (M-0.125 to M) that balances two competing requirements: sufficient torque transmission capability and adequate posture stability to prevent abnormal wear. This precise parameter specification resolves the trade-off between power transmission and durability.
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
This configuration effectively prevents abnormal wear in the clutch engagement portion by stabilizing the coil spring's posture and maintaining uniform surface pressure, thereby extending the pulley structure's lifespan and ensuring reliable torque transmission.
Implementation Method 1
the coil spring is configured to be engaged with the outer rotating body and the inner rotating body due to torsional deformation in a diameter expansion or diameter reduction direction to transmit torque between the outer rotating body and the inner rotating body
Implementation Method 2
when the inner rotating body relatively rotates with respect to the outer rotating body in a reverse direction, the coil spring is in a disengaged state where the coil spring slides (slips) with respect to the outer rotating body or the inner rotating body in the circumferential direction
Data Source
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AI summary
The present invention relates to a pulley structure (1) equipped with an outer rotating body (2), an inner rotating body (3), and a coil spring (4) provided between the outer rotating body (2) and the inner rotating body (3). The coil spring (4) is configured so as to undergo torsional deformation in a diameter-expanding or a diameter-contracting direction, thereby engaging the outer rotating body (2) and the inner rotating body (3) and transmitting torque, and to undergo torsional deformation in the direction opposite the direction in which torque is transmitted, thereby entering a disengaged state in which the coil spring slides with the outer rotating body (2) or the inner rotating body (3), thus interrupting the transmission of torque. The number of windings of the coil spring (4) is in a range between [M - 0.125] and M (both inclusive), where M is a natural number.