Vehicle Seat Screw Rod Support Mechanism for Load Distribution
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Solution Overview
Problem
Existing vehicle seat sliding devices with bearing members can generate biased loads and operating noise due to the inclination and rotation of screw rods, disrupting smooth operation.
Innovation Solution
A vehicle seat sliding device with a support mechanism that includes a holding member with an insertion hole and a holding nut, where the screw rod is inserted and pinched between the holding nut and a bulging portion, with curved surfaces forming concentric spherical surfaces, allowing the screw rod to tilt as a fulcrum and reducing biased loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bearing member supports an intermediate portion of the screw rod, then the screw rod is supported during rotation, but a biased load is generated between the screw rod and the support when the screw rod is inclined and rotated, causing operating noise and interrupting smooth operation
Solution Approach 1:
The support is designed with a spherical contact surface that matches the curvature of the screw rod. This spherical geometry allows the screw rod to rotate freely while maintaining uniform contact, eliminating biased loads and operating noise that occur with flat or rigid support structures.
2Ease of operation
If the screw rod is inclined and rotated, then the seat sliding mechanism operates, but a biased load is generated between the screw rod and the bearing member support
Solution Approach 1:
The spherical contact surface of the support conforms to the curvature of the screw rod, allowing inclined rotation without generating biased loads. This curved geometry distributes the load uniformly during seating adjustment operations.
3Ease of operation
If a conventional bearing member is used to support the screw rod, then the screw rod can rotate, but operating noise is generated and smooth operation is interrupted
Solution Approach 1:
The support features a spherical contact surface that matches the screw rod's curvature, enabling smooth rotation without operating noise. This curved geometry eliminates the friction and vibration problems associated with conventional bearing members.
Data Source
AI summary
A vehicle seat sliding device includes: a lower rail fixed to a vehicle floor; an upper rail slidably engaging with the lower rail and supports a vehicle seat upward; a nut member fixed to a first rail which configures one side of the lower rail and the upper rail; a screw rod screwed into the nut member; a drive unit rotating the screw rod; and a support supporting the screw rod on a second rail which configures the other side of the lower rail and the upper rail. The support includes a holding member that is provided with an insertion hole into which the screw rod is inserted and that is fixed to the second rail, and a holding nut that is provided with a through-hole into which the screw rod is inserted and that is screwed to a screwing portion provided on the screw rod or the holding member.