Reduction Gear Guide Pin Jamming Prevention
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Solution Overview
Problem
Existing reduction gear units in motor vehicle seats face jamming issues due to rounded transition regions between guide pins and guide grooves, leading to relative rotation and manufacturing challenges.
Innovation Solution
Incorporating cams on the first gearwheel or torque support disk to ensure that guide pins do not fully engage with guide grooves, allowing for linear guide with full surface area contact and preventing jamming, while maintaining low component count and suitable manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If guide pins are formed in one piece from the main body of the first gearwheel with rounded transition regions, then manufacturing is simplified, but jamming occurs between the guide pins and guide grooves
Solution Approach 1:
The guide pin is segmented into two separate components: the guide pin itself and the first gearwheel main body. This separation eliminates the rounded transition region that causes jamming, as the guide pin can be precisely fitted into the guide groove without manufacturing-induced rounding at the connection point.
Solution Approach 2:
A separate guide pin acts as an intermediary element between the first gearwheel and the torque support disk. This intermediary component can be precisely manufactured with sharp edges and exact dimensions, eliminating the jamming issue caused by rounded transition regions in integrated designs.
2Ease of manufacture
If guide pins are made cuboid and pushed through the material, then manufacturing is easier, but relative rotation cannot be fully prevented due to rounded transition regions
Solution Approach 1:
Separating the guide pin from the gearwheel main body eliminates the rounded transition region that compromises rotational stability. The guide pin can be precisely fitted into the guide groove, ensuring full surface area contact and preventing relative rotation between components.
Solution Approach 2:
This principle is not applicable to the mechanical guide pin system described in the patent.
3Ease of operation
If the guide pin fully engages into the guide groove, then linear guidance is achieved, but jamming occurs at the boundary edges due to rounded transition regions
Solution Approach 1:
The guide pin is separated from the gearwheel main body, allowing it to fully engage into the guide groove without rounded transition regions. This enables complete linear guidance functionality while eliminating jamming at boundary edges, as the guide pin can be precisely manufactured with sharp edges for optimal fit.
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
Prevents jamming between guide pins and guide grooves, ensuring smooth movement and reducing the risk of tilting or interlocking during relative movement, thereby enhancing the reliability and performance of the reduction gear unit.
Implementation Method 1
the first gearwheel has at least one cam which projects in the axial direction from a main body of the first gearwheel and bears against the torque support disk in such a way that the at least one guide pin does not engage completely into the guide groove
Implementation Method 2
a linear guide with full surface area contact and without or with only a small amount of play is provided
Implementation Method 3
a circulating eccentric which is driven by the first gear stage for driving a relative rolling movement of the second gearwheel on the first gearwheel, the first gearwheel being moved by the eccentric on a circular path
Data Source
AI summary
A reduction gear includes a housing (210) and gear stages with an externally toothed first gear wheel (240), and an internally toothed second gear wheel (260), meshing with the first gear wheel, and rotationally fixed to an output (270). The first gear wheel is moved circularly by an eccentric (226). A torque support disc prevents the first gear wheel rotating relative to the housing. The first gear wheel has a guide pin which engages in a guide groove of the torque support disc, or the torque support disc has a guide pin, which engages in a guide groove of the first gear wheel. The first gear wheel has a base body with a cam or the torque support disc has a base part with a cam which projects in the axial direction and contacts the torque support disc whereby the guide pin does not completely engage in the guide groove.