Vehicle Seat Roller Guide Bearing for Play-Free Scissor Adjustment
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Solution Overview
Problem
Existing vehicle seats in commercial vehicles face issues with excessive play and wear due to component and assembly tolerances in the floating bearings of the scissors mechanism, impairing guidance and mobility.
Innovation Solution
A vehicle seat design incorporating a floating bearing with a combination of a rolling element and a sliding element, where the rolling and sliding planes are aligned at an angle α from 0° to 90°, eliminating play by ensuring optimal force transmission and minimizing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a floating bearing with a single roller is used in the scissors mechanism, then the structure is simple and easy to manufacture, but component and assembly tolerances cause excessive play and impaired guidance
Solution Approach 1:
The patent combines a rolling element (roller) and a sliding element (slider) into a single floating bearing assembly that interacts with the guide rail. The roller provides rolling contact while the slider provides sliding contact, and both are mounted on the same axle. This merging of two different contact mechanisms eliminates the play caused by tolerances in a single-roller design while maintaining ease of manufacture through modular assembly.
2Device complexity
If a floating bearing with a single roller is used in the scissors mechanism, then the structure is simple, but excessive play increases wear due to tolerance accumulation
Solution Approach 1:
The patent merges a rolling element and a sliding element into one floating bearing unit. The roller reduces friction through rolling contact, while the slider compensates for tolerances and guides the assembly along the rail. This combination improves reliability and reduces wear compared to a single-roller design, while the overall structure remains relatively simple and modular.
3Ease of operation
If the rolling plane and sliding plane are aligned parallel (0° angle), then the guidance is simple, but play cannot be eliminated and wear increases
Solution Approach 1:
The patent employs an asymmetric arrangement where the rolling plane and sliding plane are angled relative to each other (not parallel). The rolling element contacts the guide rail at one angle while the sliding element contacts at a different angle. This asymmetric geometry allows the floating bearing to self-align and eliminate play in multiple directions simultaneously, while maintaining smooth guidance through the scissors mechanism.
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 solution effectively eliminates play and reduces wear in the floating bearings, enhancing the mobility and durability of the scissors mechanism, thereby improving the overall performance and comfort of the vehicle seat.
Implementation Method 1
the rolling element rotates about a rolling axis of the axle
Implementation Method 2
the sliding element has at least one point of contact with a sliding plane of the first rail element or a second rail element of the frame part
Data Source
AI summary
A vehicle seat having a seat part and a vehicle seat base with a frame part for supporting the seat part or for attachment to a vehicle body and a height-adjustable scissors mechanism with a scissors arm. The frame part has a first rail element. An end of the first scissors arm is connected to the first rail element by a floating bearing that has a rolling element with an axle and a sliding element that are arranged one behind the other The rolling element has a contact point with a rolling plane of the first rail element and the sliding element has a contact point with a sliding plane of the first rail element or of a second rail element of the frame part. The rolling plane and the sliding plane are aligned at an angle α from a range 0<α<90° to one another.