Overlapping Gear Arrangement for Compact Drive Rod Lining
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Solution Overview
Problem
Existing gear arrangements for window and door connecting rod fittings have limited load-carrying capacity due to the 'flying' bearing of the output-side gear element, which restricts the transmission's ability to handle large loads and requires larger gear housings, weakening the window or door sash.
Innovation Solution
The gear arrangement features a free space on the overlapping side between the covered and overlapping gear elements, allowing for a larger mutual overlap and closer placement of their axes of rotation, enabling a more compact design that accommodates long strokes without cantilever mounting, and provides bearing points on both sides for enhanced load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the output-side gear element is mounted with a 'flying' bearing (single-sided bearing point), then the gear arrangement can be simpler and more compact, but the load-carrying capacity is limited
Solution Approach 1:
The bearing support is segmented into two separate bearing points located on opposite sides of the gear element, rather than using a single bearing point. This allows the gear element to be supported at both ends, significantly improving load-carrying capacity while maintaining a relatively simple overall structure.
2Volume of stationary object
If the gear elements overlap more to reduce the distance between axes of rotation, then the gear housing can be smaller and more compact, but the bearing point of the covered gear element becomes constrained
Solution Approach 1:
The bearing points are positioned in the axial direction (along the axis of rotation) rather than only in the radial direction. By extending the bearing points axially beyond the overlap region, the gear elements can overlap more in the radial direction to reduce gear housing size, while the bearing points remain accessible and unconstrained in the axial dimension.
3Strength
If bearing points are provided on both sides of the gear element, then the load-carrying capacity is enhanced, but the gear arrangement requires more space and becomes less compact
Solution Approach 1:
The bearing points on both sides of the gear element are merged with the gear element itself, forming an integrated structure. The bearing points are directly formed as part of the gear element body, eliminating the need for separate bearing housings or mounting structures, thereby enhancing load-carrying capacity without significantly increasing the overall gear housing volume.
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
The arrangement (1) has a gear (16) arranged at an operating device and at a drive rod. The gear has gear elements (17, 18) that are designed as tooth elements and rotatable around rotational axes (19, 20). The gear elements are displaced opposite to each other in the direction of the axes and overlap each other in a radial direction of the axes, where one of the gear elements has a bearing surface (32). A free area (33) is formed between the gear element and the bearing surface, where the other gear element is moved in the free space during rotation.