Vehicle Seat Fitting Eccentric Gear Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle seat fitting systems for adjusting the inclination of backrests lack effective sealing and protection of the eccentric mechanism, leading to grease displacement and potential contamination from dust or varnish during operation.
Innovation Solution
A fitting system utilizing an eccentric epicyclic gear with a separating ring that subdivides the installation space, providing additional protection to the eccentric and maintaining grease within the inner space, while allowing continuous adjustment of the backrest inclination through a gear system that includes a toothed ring and wheel, and a locking mechanism for dynamic loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing ring is used to seal the installation space, then sealing is improved, but grease displacement by the rotating eccentric cannot be prevented
Solution Approach 1:
The installation space is divided into two separate sealed spaces by the separating ring: a first sealed space for the gear and a second sealed space for the eccentric. This segmentation prevents grease from the eccentric from displacing into the gear area while maintaining sealing at both interfaces.
Solution Approach 2:
The separating ring acts as an intermediary element between the gear and the eccentric, creating a physical barrier that separates the two components and their respective grease environments, preventing mutual contamination and grease displacement.
2Adaptability or versatility
If the eccentric is allowed to rotate freely for continuous adjustment, then adjustability is improved, but grease is gradually displaced from the installation space
Solution Approach 1:
The installation space is segmented into two independently sealed areas, allowing the eccentric to rotate freely within its designated space without displacing grease to the gear area, thus maintaining both adjustability and grease retention.
Solution Approach 2:
The separating ring is made of flexible plastic material that can accommodate the rotation of the eccentric while maintaining the seal, allowing continuous adjustment motion without compromising the grease containment.
3Volume of stationary object
If the toothed wheel is positioned on the radially outer edge to save space, then installation space is reduced, but mounting area may be insufficient
Solution Approach 1:
The toothed wheel is positioned on the radially outer edge of the second fitting part, utilizing the radial dimension efficiently. The enclosing ring engages with this outer edge positioning, allowing compact radial arrangement while providing sufficient axial and circumferential mounting areas.
Solution Approach 2:
The toothed wheel is nested within the overall fitting structure such that it occupies the radially outer edge position, allowing the enclosing ring to engage over it while maintaining compact overall dimensions and sufficient mounting surface area on the fitting parts.
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 ensures effective sealing and protection of the eccentric mechanism, preventing grease displacement and contamination, while enabling continuous and reliable adjustment of the backrest inclination, even under dynamic loads, and reduces material usage and installation space.
Implementation Method 1
a separating ring (61), which subdivides the installation space B into a radially outer sealed installation space Ba and a radially inner sealed installation space Bi
Implementation Method 2
an eccentric (27, 27') which is supported rotatably in the collar (19) and has a direction of eccentricity which is changeable during rotation
Implementation Method 3
The basic part of the locking of the eccentric epicyclic gear is provided by the friction between the eccentric and one of the two fitting parts
Implementation Method 4
The basic part of the locking of the eccentric epicyclic gear is provided by the friction between the eccentric and one of the two fitting parts
Data Source
AI summary
A fitting for a vehicle seat, in particular for a motor vehicle seat, includes a first fitting part, on which a ring gear is formed, a second fitting part, on which a gear is formed. The gear meshes with the ring gear, whereby the two fitting parts are in transmission connection with each other. It also includes a rotatably supported eccentric for driving a relative rolling motion of the gear and the ring gear, wherein the eccentric rotates in the circumferential direction and is driven by a carrier. An installation space is provided between the first fitting part and the second fitting part, wherein a separating ring is arranged in the installation space. The separating ring divides the installation space into an outer installation space, and an inner installation space.