Webbing Winding Device Simplified Clutch Mechanism
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Solution Overview
Problem
The existing webbing winding devices have complex clutch mechanisms that increase the number of components and costs, making them less operable and more expensive.
Innovation Solution
A webbing winding device with a simplified clutch mechanism using a rotating body, a rotation transmission member, a retaining member with pair of retaining portions, and an interference member that allows displacement to connect the rotation transmission member to the spool, reducing the number of components and enhancing operability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex clutch mechanism and brake mechanism are used to connect the motor output shaft to the spool, then reliable operation is achieved, but the number of components increases and cost increases
Solution Approach 1:
The patent combines the clutch mechanism and brake mechanism into a single integrated clutch mechanism. The clutch includes both a clutch plate that connects the motor output shaft to the spool and a brake plate that prevents reverse rotation, merging two previously separate functions into one component assembly. This reduces the number of components while maintaining reliable operation during webbing winding.
Solution Approach 2:
The clutch mechanism serves multiple functions simultaneously: it transmits motor power to rotate the spool in the winding direction, prevents reverse rotation of the spool, and controls the engagement and disengagement of power transmission. By designing the clutch plate and brake plate to work together within a single mechanism, the patent achieves multi-functionality that reduces overall system complexity.
2Reliability
If a complex clutch mechanism with multiple components is used, then reliable power transmission is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the clutch mechanism and brake mechanism into a single integrated assembly with fewer discrete components. The clutch plate and brake plate are designed to work together within one mechanism, reducing the total number of parts that need to be manufactured, assembled, and quality-checked, thereby lowering manufacturing costs while maintaining reliable power transmission.
Solution Approach 2:
The patent employs a friction-based braking system where the brake plate creates friction against the clutch plate to prevent reverse rotation. This friction-based approach uses material properties rather than complex mechanical linkages, simplifying the manufacturing process and reducing costs while ensuring reliable one-way power transmission.
3Device complexity
If a simplified clutch mechanism is used, then cost is reduced and operability is improved, but the structure may become insufficient for reliable operation
Solution Approach 1:
The patent achieves a simplified yet reliable structure by merging the clutch and brake functions into one integrated mechanism. The clutch plate handles power transmission while the brake plate handles reverse rotation prevention, and both work together within a single clutch assembly. This unified design reduces structural complexity compared to having separate mechanisms while ensuring reliable operation through coordinated functionality.
Solution Approach 2:
The clutch mechanism is designed to perform multiple functions within a single structure: power transmission during winding, prevention of reverse rotation during webbing payout, and controlled engagement/disengagement. This multi-functional design maintains reliability while simplifying the overall mechanism structure and reducing the number of separate components needed.
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 simplified mechanism reduces costs, improves operability, and ensures reliable interference between components, minimizing assembly errors and frictional differences, resulting in efficient winding of webbing belts.
Implementation Method 1
an interference member which is provided between the pair of retaining portions so as to be elastically retained by the retaining portions in a press contact state
Data Source
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AI summary
A webbing winding device includes a clutch mechanism interposed between a spool and an output shaft of a motor and has a simple structure and high operability. In an interference piece (140) that has an interference portion (152) interfering with a connection pawl when an input gear of a clutch is rotated in the winding direction, a base portion (142) is disposed between an outer retaining ring (146) and an inner retaining ring (148) formed at a gear box (52), and the base portion (142) comes into press contact with an inner peripheral portion of the outer retaining ring (146) and an outer peripheral portion of the inner retaining ring (148). The interference portion (152) keeps interfering with the connection pawl until a pressing force more than a maximum static frictional force generated between the inner peripheral portion of the outer retaining ring (146) and the outer peripheral portion of the inner retaining ring (148), and the base portion (142) is applied to the interference portion (152), thereby rotating the connection pawl.