Roller Drive With Friction Coupling and Plastic Gears
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Solution Overview
Problem
Existing roller drives face challenges in achieving high speed translation in a compact space while protecting the electric motor and gearbox from overload, and require lubrication, which complicates the design.
Innovation Solution
A roller drive system where an electric motor drives a transport roller through an epicyclic gear with a non-positive connection, using a disc mounted on a rotor shaft via a bearing, connected to a cheek via axially arranged bolts, allowing for coaxial planetary gear operation and eliminating the need for lubrication by using plastic components and metal bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an epicyclic gear is used to achieve high speed translation in a compact space, then the speed translation is improved, but the risk of overload damage to the motor and gearbox increases
Solution Approach 1:
The patent changes the connection parameter from rigid to frictional by using a friction wheel instead of a rigid coupling between the epicyclic gear output and the transport roller. This allows the system to maintain high speed translation while providing overload protection through the friction connection that slips under excessive load.
2Strength
If traditional mechanical components are used in the gearbox, then the structural strength is improved, but the requirement for lubrication increases device complexity
Solution Approach 1:
The patent changes the material parameter from traditional metal-on-metal contact to plastic-metal contact by using plastic gears and a metal friction wheel. This parameter change eliminates the need for lubrication while maintaining sufficient structural strength for the application.
Solution Approach 2:
The patent employs composite material selection by combining plastic components (gears, friction wheel) with metal bolts and housing elements. This composite approach provides the necessary strength while eliminating lubrication requirements that would be needed with traditional all-metal constructions.
3Power
If a rigid connection is used between the gearbox output and transport roller, then the power transmission efficiency is improved, but the protection against overload is reduced
Solution Approach 1:
The patent changes the connection parameter from rigid to frictional by using a friction wheel that contacts the output disc of the epicyclic gear. This frictional connection provides sufficient power transmission for normal operation while automatically slipping to protect against overload conditions.
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
Enables high speed translation in a compact space with overload protection and reduced wear, eliminating the need for lubrication, thus simplifying the design and enhancing operational reliability.
Implementation Method 1
the relative speed between the inner ring and outer ring of the bearing can be reduced because the radius is smaller than in an arrangement in which the outer ring of the bearing is arranged on the hollow part and the inner ring on the cheek
Implementation Method 2
The cheek is mounted on the hollow part or on the motor housing via a bearing, in particular a ball bearing
Implementation Method 3
A respective bolt receives a respective rotating disk, which is in contact with the hollow part, which is fixed to the motor housing, and with the cyclo-disc, which is fixed for rotation with the rotor shaft
Implementation Method 4
the cyclone disc, the hollow part and/or the revolving discs are made of plastic. The advantage here is that no lubricant is required in the gearbox
Data Source
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AI summary
The invention relates to a roller drive, wherein a transport roller (42) is driven by an electric motor arranged within the transport roller (42), the rotor shaft (1) of the electric motor being rotatably supported relative to the housing of the motor, wherein the rotor shaft (1) is the driving shaft of a planetary gear train or is connected to the driving shaft in a rotationally fixed manner, and the output of the gear train is non-positively connected to the transport roller (42), in particular