Chain Drive Damping Element for Vibration Suppression
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Solution Overview
Problem
Chain drives, particularly in lifting systems, experience unwanted vibrations due to the polygon effect, which are typically addressed by using expensive tooth chains or belts with limited lifetimes.
Innovation Solution
A chain drive unit with a damping element that utilizes two parallel sprockets with a partial pitch difference to phase-shift adjacent chains, combined with a force transmission unit like arc-shaped leaf springs or magnets, to distribute and transmit forces between chains, reducing vibrations without the need for smaller teeth or belts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If roller chains are used with standard sprockets, then the chain drive unit is cost-effective and simple, but vibrations occur due to the polygon effect
Solution Approach 1:
The invention intentionally introduces controlled vibrations through a damping element that connects adjacent chains. This damping element is designed to vibrate at a frequency that counteracts the polygon effect vibrations, effectively canceling them out through destructive interference. The damping element includes a vibration-generating component that creates counter-vibrations to suppress the harmful vibrations caused by the polygon effect.
Solution Approach 2:
The damping element acts as an intermediary component between adjacent chains. It includes connection elements that attach to both chains and a force transmission unit that transmits and balances forces between them. This intermediary structure distributes the polygon effect forces across multiple chains, reducing the amplitude of vibrations in each individual chain.
2Object-affected harmful factors
If tooth chains are used to prevent vibrations, then chain vibrations are suppressed, but the cost increases significantly
Solution Approach 1:
The invention replaces expensive tooth chains with a combination of standard roller chains and a relatively inexpensive damping element. The damping element can be a simple mechanical component such as a spring, damper, or flexible connector that is much cheaper than tooth chains but effectively achieves vibration suppression through force distribution and counter-vibration mechanisms.
Solution Approach 2:
The damping element may incorporate composite structures combining different materials with complementary properties. For example, combining elastic materials for vibration absorption with rigid connection elements for force transmission, creating a cost-effective composite damping solution that outperforms single-material approaches.
3Object-affected harmful factors
If tooth belts are used to prevent vibrations, then chain vibrations are suppressed, but the service life is limited
Solution Approach 1:
The invention replaces tooth belts with a damping element made from durable materials designed for long service life. Instead of relying on the toothed engagement of belts that wear over time, the solution uses robust mechanical damping components such as metal springs, hydraulic dampers, or friction-based elements that can withstand repeated cyclic loading without degrading rapidly.
Solution Approach 2:
The damping element's physical parameters such as stiffness, damping coefficient, and mass are optimized to provide effective vibration suppression over the entire service life of the chain drive unit. The parameters are selected to maintain effectiveness even as the system ages and operating conditions change.
4Object-affected harmful factors
If chain wheels with increased number of teeth are used, then vibrations are reduced, but the device complexity and cost increase
Solution Approach 1:
Instead of modifying the sprockets to have increased teeth, the invention introduces a damping element as an intermediary component between the chains. This element mediates the forces and vibrations without requiring changes to the existing sprocket design, maintaining simplicity while achieving vibration suppression.
Solution Approach 2:
The invention changes the parameters of the chain system by introducing a damping element with specific mass, stiffness, and damping characteristics, rather than changing the sprocket tooth parameters. This approach achieves vibration control through additive modification rather than redesigning the existing components.
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
This solution effectively suppresses chain vibrations while maintaining the original pitch and tooth size, ensuring a cost-effective and long-lasting damping solution for chain drives.
Implementation Method 1
a force transmission unit arranged between the first and the second fixation transmitting an applied force from the first fixation to the second fixation and vice versa
Implementation Method 2
at least one damping element connecting two adjoining chains... effectively suppresses chain vibrations
Implementation Method 3
a force transmission unit like arc-shaped leaf springs or magnets
Data Source
AI summary
A chain drive unit (4, 5, 6) for reducing chain vibrations comprising a chain wheel unit (43) with at least two sprockets (431, 432) that are arranged parallel on a common rotation axle, at least two parallel chains (51, 52) engaging these sprockets (431, 432). At least one damping element (6) connecting two adjoining chains (51, 52). The circumferential orientation of two adjoining sprockets (431, 432) differs by a partial pitch (pP) and the damping element (6) comprises a first fixation (61) on its one free end for the lateral fixation to the first chain (51), a second fixation (62) on its opposite free end for the lateral fixation to the second chain (52) and a force transmission unit (63, 8, 9) arranged between the first and the second fixation transmitting an applied force from the first fixation (61) to the second fixation (62) and vice versa.