Self-adjusting Drive Wheel with Segmented Teeth
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Solution Overview
Problem
Conventional sprockets experience uneven wear and force distribution due to manufacturing tolerances in chain links, leading to increased wear on both chain links and sprocket teeth, as not all teeth are loaded evenly under force.
Innovation Solution
A self-adjusting drive wheel design featuring toothed segments with radial boundary surfaces and clamping sleeves that allow for tilting and rotating movements, distributing forces evenly across multiple segments and using seals to prevent dirt entry, with clamping sleeves transmitting both compressive and tensile forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sprockets with fixed teeth are used, then the structure is simple and easy to manufacture, but manufacturing tolerances in chain links cause uneven wear on the sprocket teeth and increased wear on chain links
Solution Approach 1:
The sprocket is divided into multiple toothed segments that can move independently relative to the base body. Each segment can rotate or tilt about a horizontal axis, allowing the sprocket to adapt to chain pitch variations and distribute wear more evenly across all teeth.
Solution Approach 2:
The toothed segments are designed to be movable rather than fixed, enabling them to adjust their position dynamically in response to chain tension and pitch variations. This dynamic adjustment ensures even load distribution and reduces wear.
2Reliability
If toothed segments are made movable to compensate for chain tolerances, then wear is reduced and force distribution is improved, but the device complexity increases due to additional components and mounting mechanisms
Solution Approach 1:
The sprocket is divided into multiple toothed segments that can move independently relative to the base body. Each segment can rotate or tilt about a horizontal axis, allowing the sprocket to adapt to chain pitch variations and distribute wear more evenly across all teeth.
Solution Approach 2:
The spring elements automatically adjust the toothed segments to compensate for chain pitch variations without external control. The system self-regulates by allowing segments to move and adjust their position based on the applied forces, eliminating the need for complex control mechanisms.
3Force
If radial boundary surfaces are used between toothed segments, then the segments can tilt and rotate freely to distribute forces, but the structure becomes more complex compared to conventional fixed teeth
Solution Approach 1:
The toothed segments are designed to be movable rather than fixed, enabling them to adjust their position dynamically in response to chain tension and pitch variations. This dynamic adjustment ensures even load distribution and reduces wear.
Solution Approach 2:
The lateral boundary surfaces of the toothed segments are continuously directed radially, allowing the segments to change their orientation parameters (tilting and rotating) in response to applied forces, thereby optimizing force distribution across all segments.
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 design achieves reduced wear and noise by distributing force over a larger number of segments and effectively compensating for manufacturing tolerances, resulting in a more uniform load distribution and reduced wear on both the sprocket and chain.
Implementation Method 1
an elastic, flexible spring element is arranged in each case, which is designed as a rubber element
Implementation Method 2
A seal is preferably provided between adjacent toothed segments radially outside of the spring element. This seal prevents dirt or dust particles from entering the radial gap between adjacent toothed segments.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The self-adjusting drive wheel has a base body (1), on whose periphery multiple toothed segments (2) are provided. The toothed segments are rotatable or tiltable around an axis in peripheral direction. The axis runs parallel to a central axis of the base body. An elastically flexible spring element is arranged between adjacent atoother sgements. The lateral boundary surfaces (3) of the toothed segments extend continuously radially. The opposite recesses are arranged in the radially extending boundary surfaces of the adjacent toothed segments. The spring element is formed as clamping sleeve.