Spring Clutch Mechanism Coaxial Alignment High Speed
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Solution Overview
Problem
Existing spring clutch mechanisms fail to maintain co-axial arrangement at high speed rotations and are prone to disengagement due to vibrations in power tools like screwdrivers.
Innovation Solution
A spring clutch mechanism with a bearing section and seat section made of low-friction metal, featuring a tightly wound coil spring that increases friction in the forward direction and allows reverse rotation, ensuring coaxial alignment and preventing disengagement, combined with a one-way clutch for efficient power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a coil spring is used to connect the drive member and driven member, then power transmission is enabled, but the co-axial arrangement cannot be maintained at high speed rotation
Solution Approach 1:
The clutch mechanism is divided into separate functional components: a drive member with drive grooves, a driven member with corresponding grooves, and a coil spring positioned between them. This segmentation allows each component to perform its specific function while maintaining overall co-axial stability during high-speed rotation.
Solution Approach 2:
The coil spring acts as an intermediary element between the drive member and driven member. It transmits torque while accommodating radial movements and maintaining co-axial alignment through its elastic properties, enabling stable high-speed rotation.
2Reliability
If a coil spring is used to connect the drive member and driven member, then power transmission is enabled, but the coil spring may be disengaged due to vibration
Solution Approach 1:
The coil spring is pre-compressed between the drive member and driven member before operation begins. This preliminary compression ensures that the spring maintains constant contact with both members during vibration and operation, preventing disengagement while allowing torque transmission.
Solution Approach 2:
The elastic nature of the coil spring provides beforehand cushioning against vibrational forces. The spring's ability to deform and recover absorbs shock and vibration impacts, maintaining reliable engagement between the drive member and driven member throughout operation.
3Power
If the coil spring inner diameter decreases to transmit torque, then power transmission is achieved, but friction is insufficient for high-speed rotation
Solution Approach 1:
The friction characteristics are enhanced by changing the surface parameters of the drive and driven members. Grooves are formed on the outer peripheral surface of the drive member and corresponding grooves on the inner peripheral surface of the driven member, increasing the friction coefficient and enabling effective torque transmission at high speeds.
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
Enables high-speed rotation and prevents coil spring disengagement, ensuring reliable power transmission and durability by maintaining coaxial alignment and reducing noise and vibration impacts.
Implementation Method 1
The rotation of the drive member causes decrease in inner diameter of the coil spring to drivingly connect the drive member and the driven member through the coil spring
Implementation Method 2
When the driven member is rotated in reverse, the inner diameter of the coil spring increases, and hence reverse rotation of the driven member is allowed
Implementation Method 3
A spring clutch mechanism with a bearing section and seat section made of low-friction metal
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
A spring clutch mechanism for transmitting a driving force of a driving part (4) to a driven part (5), including a first part (61), a second part (62), and a spring (63) disposed between the first part (61) and the second part (62). The first part (61) is connected to the driven part (5). The second part (62) is connected to the driving part (4) and is rotatable relative to the first part (61) coaxially therwith. The first part (61) has a first end (61c) provided with a frusto-conical portion having a first tapered surface, and the second part has a second end (62c) formed with a recess provided with a second tapered surface in contact with the first tapered surface, the first part (61) and the second part (62) are aligned linearly and coaxially in a state that the first end (61c) is inserted into the second end (62c) maintaining contact of the first tapered surface with the second tapered surface.