Webbing Winding Device Axial Engagement Lock Mechanism
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Solution Overview
Problem
Existing webbing winding devices for vehicle safety belts face issues with the transmission of rotational movement being affected by the inclination of components, leading to inefficient regulation of the spool rotation during rapid vehicle deceleration or webbing extraction.
Innovation Solution
A webbing winding device with a lock mechanism that includes a spool, a regulation member, a rotation member, and a link member, where the rotation member connects the spool and regulation member to regulate spool rotation, and a protrusion and hole configuration that minimizes interference and maintains alignment, ensuring smooth transmission of rotation even when components are inclined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inner peripheral portion of an elongated hole presses an outer peripheral portion of a protrusion to transmit rotation, then rotation transmission is achieved, but the driven body becomes influenced by inclination of the driving body
Solution Approach 1:
The invention changes the contact dimension from radial (inner peripheral portion pressing outer peripheral portion) to axial (front end surface pressing rear end surface). This dimensional shift allows rotation transmission while eliminating the harmful effect of inclination, as axial contact is not sensitive to radial misalignment or inclination of the components.
2Ease of manufacture
If the opening direction of the elongated hole is inclined with respect to the protruding direction of the protrusion, then assembly is simplified, but the inner peripheral portion presses the front end of the protrusion causing forced inclination
Solution Approach 1:
The invention transitions from radial contact (sensitive to inclination) to axial contact (insensitive to inclination). The protrusion's front end surface contacts the driven body's rear end surface axially, allowing assembly tolerance while maintaining stable alignment and preventing forced inclination during operation.
3Ease of operation
If a protrusion is inserted into an elongated hole for movement transmission, then mechanical connection is achieved, but movement transmission occurs in an inclined state
Solution Approach 1:
The invention changes the engagement mode from radial insertion (pr protrusion into elongated hole) to axial engagement (front end surface pressing rear end surface). This axial engagement method transmits movement reliably without the harmful effect of inclination, as the contact force is applied along the axis rather than radially.
Data Source
AI summary
Provided is a webbing winding device having a lock mechanism in which a driven body is less influenced by an inclination of a driving body. A peripheral wall extends from an edge portion of a penetration hole formed at a sensor gear constituting the lock mechanism toward a link member, and a guide hole is formed at a bottom wall formed at the front end of the peripheral wall. An engagement pin of the link member passes through the guide hole from the base end portion rather than the front end portion thereof in the protruding direction. Further, in the front end side of the engagement pin passing through and protruding from the guide hole, the outer peripheral portion is spaced apart from the inner peripheral portion of the peripheral wall.