Double-Sprocket Chain Drive Assembly for Compact, Low-Wear Lifting
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Solution Overview
Problem
Existing lifting devices with single-strand chain drives face issues of reduced service life, increased space requirements, and decreased lifting speed due to multiple deflections and larger chain dimensions, which are exacerbated by the use of multiple strands.
Innovation Solution
A chain drive arrangement with two sprockets arranged side by side on a shaft, maintaining the same angular position, allowing for a double-strand configuration without additional deflections, using smaller chain links and sprockets, and incorporating a housing to guide the chains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple strand chain drive arrangement is used to double the load-bearing capacity, then the load capacity is improved, but the chain service life is significantly reduced due to tripling of chain deflections
Solution Approach 1:
The invention divides the chain drive system into multiple independent chain strands (typically two or more) that are guided over separate sprockets. Each chain strand operates independently with its own sprocket, eliminating the need for additional deflection pulleys. This segmentation allows the load to be distributed across multiple chains while maintaining simpler geometry and reducing wear on individual chain links.
Solution Approach 2:
The invention transitions from a single-chain vertical arrangement to a multi-chain horizontal arrangement where chains are guided over sprockets positioned at different locations along the lifting mechanism. This spatial reconfiguration allows multiple chains to share the load without requiring the chains to deflect vertically over additional pulleys, thus reducing wear while maintaining increased load capacity.
2Strength
If multiple strand chain drive arrangement is used to double the load-bearing capacity, then the load capacity is improved, but the lifting speed is reduced inversely to the number of strands
Solution Approach 1:
By segmenting the load-bearing function across multiple independent chain strands, each chain can operate at full speed without the constraints imposed by additional deflection pulleys. The segmentation allows parallel operation of multiple chains, maintaining lifting speed while distributing the load.
Solution Approach 2:
The invention ensures continuous useful action by having multiple chains operate simultaneously and independently, each contributing to the load-bearing capacity without interrupting the lifting motion. This eliminates the speed reduction that would occur with sequential operation of multiple strands through deflection pulleys.
3Strength
If multiple strand chain drive arrangement is used to double the load-bearing capacity, then the load capacity is improved, but the space required by the sprockets is significantly increased
Solution Approach 1:
The invention segments the sprocket arrangement into multiple smaller sprockets positioned at different locations along the lifting mechanism, rather than using one or two large sprockets. This segmentation reduces the overall space requirement while maintaining the ability to guide multiple chain strands effectively.
Solution Approach 2:
The invention reconfigures the sprocket arrangement from a concentrated vertical arrangement to a distributed horizontal arrangement. By positioning sprockets at different locations along the lifting mechanism rather than stacking them vertically, the design reduces the space requirement while maintaining functional effectiveness.
Data Source
Figure 1a~2
Figure 3~5c
Figure 4a~6c
AI summary
A lifting device with an electric or pneumatic motor and two link chains has two sprockets (R11, R12) arranged side by side on a shaft (d) driven by the motor. Each sprocket serves to guide a section of a link chain with alternating horizontal (L) and vertical (T) links, namely with pockets for receiving horizontal links and with a circumferential groove for receiving vertical links. The sprockets (R11, R12) are arranged in a rotationally fixed position relative to each other at the same angular orientation, in which the angular pockets of the two sprockets are offset from each other by only a distance parallel to the shaft, but are not rotated relative to each other.