Vehicle Seat Drive Backlash Compensation
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Solution Overview
Problem
Existing vehicle seat drive devices face issues with backlash and noise due to assembly inaccuracies and tolerances, leading to incorrect tooth positioning and reduced force transmission in height adjustment kinematics.
Innovation Solution
The implementation of a compensating body with a chamfer and ribs to align the drive's position relative to the side part, eliminating production-related tolerances and ensuring backlash-free tooth meshing between the pinion and toothed segment, thereby reducing noise and improving assembly ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drive devices are assembled using standard mounting methods, then assembly is straightforward, but assembly inaccuracies and tolerances cause backlash and noise in the tooth engagement
Solution Approach 1:
The compensating body is pre-integrated into the drive device assembly before mounting to the side part. This preliminary positioning action ensures that the pinion and toothed segment are pre-aligned with zero backlash, compensating for manufacturing tolerances before the final mounting operation occurs.
Solution Approach 2:
The compensating body acts as an intermediary element between the drive device and the side part. It mediates the alignment and positioning, absorbing dimensional variations and ensuring precise tooth engagement without requiring complex adjustment procedures during assembly.
2Manufacturing precision
If the gear teeth are positioned too close together to reduce play, then backlash is reduced, but assembly becomes more difficult due to tolerance accumulation
Solution Approach 1:
The compensating body introduces a variable parameter (compensation amount) that can be adjusted to optimize the tooth engagement. This allows the system to achieve zero backlash by compensating for tolerance variations without requiring extremely tight manufacturing tolerances on all components.
Solution Approach 2:
The compensating body is positioned in advance during drive assembly to pre-establish the optimal tooth engagement geometry. This preliminary positioning eliminates the need for difficult field adjustments and allows standard tolerance ranges to be used while still achieving precise zero-backlash engagement.
3Object-affected harmful factors
If standard mounting procedures are used, then assembly is simple, but noise is generated due to play between gear teeth during operation
Solution Approach 1:
The compensating body serves as a mediator that eliminates play between the pinion and toothed segment. By providing precise positioning and alignment, it prevents impact and noise during operation without requiring complex active control systems or adjustment mechanisms.
Solution Approach 2:
The zero-backlash condition is established in advance through the compensating body's integration into the drive assembly. This preliminary action ensures noise-free operation from the start, eliminating the need for post-assembly adjustments or complex noise mitigation systems.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A vehicle seat (1) having adjustment kinematics, in particular height-adjustment kinematics (6), with movable rockers (12, 14), in particular for adjusting the height of a seat frame of the vehicle seat (1) relative to a connectable vehicle structure, wherein at least one rocker (14) is mounted rotatably about an axis (A), in particular about an axis (A) of a transverse tube (16), and a toothed segment (18) which is connected to the at least one rocker (14) is provided, wherein the vehicle seat (1) has a drive (20) for moving the at least one rocker (14), and the drive (20) is mounted on a seat frame, in particular on a side part (100) of the seat frame, wherein a pinion (26) of the drive (20) meshes with the toothed segment (18), wherein, by aligning the position of the entire drive (20) relative to the side part (100) by means of a compensating body (200), the pinion (26) is positioned relative to the toothed segment (18) in a manner free from play.