Vehicle Seat Scissors Mechanism Play Compensation
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Solution Overview
Problem
Existing vehicle seat designs fail to effectively compensate for play in both the transverse and vertical directions, leading to inefficiencies in force distribution and adjustment.
Innovation Solution
A vehicle seat design featuring a wheel on a second guide that is angled to align with the force flow, accompanied by a slider on a first guide that is inclined to compensate for play, with a preload mechanism using a spring to ensure precise interaction between the wheel and slider, allowing for independent movement and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slider is used on an inclined guide, then transverse play is compensated, but vertical force distribution is inefficient
Solution Approach 1:
The force distribution function is segmented between two separate elements: the slider on the inclined first guide handles transverse play compensation, while the wheel on the vertical second guide handles vertical force distribution. This segmentation allows each element to be optimized for its specific function.
Solution Approach 2:
The wheel acts as an intermediary that directly transmits vertical forces from the cross tube to the frame through the vertical second guide, providing efficient vertical force distribution without being affected by the inclination of the first guide.
2Reliability
If the guide is inclined to compensate for play, then multi-directional play compensation is achieved, but the structure becomes more complex
Solution Approach 1:
The first guide and second guide are merged into a single integrated guide structure formed as one piece with the frame. This combining of functions into a unified structure reduces the number of separate components and simplifies manufacturing while maintaining multi-directional play compensation capabilities.
Solution Approach 2:
The integrated guide structure serves multiple functions simultaneously: the inclined first guide section compensates for transverse play, the vertical second guide section compensates for vertical play, and both work together to provide stable support. This multi-functionality reduces the need for separate components.
3Stability of the object's composition
If the wheel is constrained to a fixed path, then vertical alignment is maintained, but transverse adjustment freedom is reduced
Solution Approach 1:
The wheel is given freedom to move dynamically in the transverse direction along the vertical second guide while maintaining contact. This dynamic capability allows the wheel to adjust its transverse position to accommodate play compensation while the vertical alignment is maintained through the guide's geometry and the preload mechanism.
Solution Approach 2:
The preload force applied to the wheel through the spring mechanism can be adjusted to optimize the balance between maintaining vertical alignment and allowing transverse movement freedom. By changing the preload parameter, the system can adapt to different operating conditions and play levels.
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
This design enhances the vehicle seat's ability to compensate for play in multiple directions, ensuring precise force distribution and smooth adjustment, improving the overall stability and usability of the seat.
Implementation Method 1
The slider is preferably preloaded, for example by means of a preload between different bearing elements, which is preferably applied by a spring.
Implementation Method 2
The wheel rolls along the preferably profiled second guide, which is provided, for example, on a lower leg of the frame, in order to run through a defined path.
Implementation Method 3
The first guide is inclined—at least in sections—to the transverse direction of the vehicle seat at an angle different from 0° in order to be able to compensate for play in the transverse direction as well as in the vertical direction.
Data Source
Figure 1~2
Figure 3
AI summary
Disclosed is a vehicle seat (1), particularly a commercial vehicle seat, comprising a seat base (3) which is designed as a scissors-type stand and is provided with intersecting rockers (15) and at least one frame (11, 13) that movably guides at least one of the rockers (15) in the longitudinal direction (x) of the vehicle seat (1) by means of a bearing mechanism (21). The bearing mechanism (21) features at least one compensating element that rests against a first guide (33), at least some sections of which are inclined at an angle (α) relative to the transversal direction (y) of the vehicle seat (1), and can be moved along said first guide (33) in the longitudinal direction (x). The bearing mechanism (21) further features at least one rotatably mounted wheel (23) which is supported on a second guide (35) and can be rolled along said second guide (35) in the longitudinal direction (x). A slider (31) which can be displaced along the first guide (33) is used as a compensating element.