Friction Drive for Vehicle Wheel Spindle Rotation
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Solution Overview
Problem
Existing conveyor systems for vehicle wheels in powder coating processes face issues with high wear, shock loading, maintenance intensity, limited spindle speed, and difficulty in changing direction or speed, especially in explosion-protected areas due to chain-driven turning stations.
Innovation Solution
The system employs spindle and drive friction bodies with rotationally symmetrical surfaces in frictional contact, eliminating sharp transitions and allowing for low-wear, controlled rotational speeds, and easy adaptation to various configurations, using drive belts for smooth operation and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chain-driven turning stations with sprockets are used, then the spindles can be rotated, but high wear and maintenance intensity occur
Solution Approach 1:
The patent replaces the chain-driven mechanical system with a friction-based drive system. Instead of using sprockets and chains with interlocking teeth, the invention uses friction bodies that press against each other to transmit rotational motion. This substitution eliminates the wear and maintenance issues associated with chain-driven systems while maintaining the spindle rotation function.
Solution Approach 2:
The patent employs curved, rotationally symmetrical friction surfaces on both the drive friction body and the spindle friction body. These curved surfaces allow for smooth contact and rotation, distributing wear evenly and enabling continuous operation without the sharp transitions and impact loads characteristic of toothed mechanical interfaces.
2Reliability
If sprockets plunge into chains, then the spindles can be driven, but shock loading occurs
Solution Approach 1:
The curved friction surfaces enable gradual engagement and disengagement of the drive mechanism. As the drive friction body presses against the spindle friction body, the curved geometry ensures smooth contact transitions, eliminating the shock loads that occur when sprockets abruptly engage with chain links.
Solution Approach 2:
The friction-based drive system inherently cushions the transmission of force through the friction contact. The friction bodies act as a buffer, absorbing and distributing forces smoothly rather than transmitting them as sharp impacts, thereby preventing shock loading on the spindles and workpieces.
3Reliability
If chain-driven turning stations are used, then spindles can be rotated, but spindle speeds are limited to low values
Solution Approach 1:
By replacing the chain-driven system with a friction-based system, the patent removes the mechanical constraints that limited spindle speed. The friction drive allows for higher rotational speeds because it lacks the inertia and mechanical binding characteristics of chain and sprocket systems, enabling the spindles to rotate at higher velocities without mechanical interference.
4Reliability
If chain-driven turning stations are used, then spindles can be rotated, but changing direction or speed is difficult and expensive
Solution Approach 1:
The friction-based drive system is inherently more dynamic and adaptable than chain-driven systems. The contact pressure and rotational speed of the friction bodies can be easily adjusted to change the spindle's direction and speed. This dynamic control is achieved through simple adjustments to the friction drive mechanism, making the system highly versatile without requiring expensive mechanical reconfigurations.
5Reliability
If chain-driven turning stations are used in explosion-protected areas, then spindles can be rotated, but frictional heat and sparks are generated
Solution Approach 1:
The patent replaces the chain-driven mechanical system with a friction-based system that generates minimal frictional heat and no sparks. The friction bodies are designed to slide against each other with minimal resistance, and the absence of metal-to-metal impact eliminates spark generation. This makes the system suitable for use in explosion-protected areas where fire and explosion hazards must be minimized.
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 provides a low-maintenance, jerk-free, and controlled drive for spindle rotation, enabling higher spindle speeds and easier operation in critical areas, with reduced wear and no risk of sparks or frictional heat, allowing for flexible adaptation and efficient conveyor operation.
Implementation Method 1
the drive friction surface being in frictional contact locally with the spindle friction surface
Data Source
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AI summary
A device for processing workpieces is described, in particular vehicle wheels (12), in particular as part of a powder coating step, having a conveyor (10), which guides the workpieces (12) along a motion path through the device. The conveyor (10) comprises a moving conveyor element (18). The workpieces (12) can be arranged on spindle-shaped elements (24), which are attached on the conveyor element (18) and can be rotated about the spindle axis of rotation thereof by means of a rotary device (47a, 47b). The spindle-shaped elements (24) in each case have at least one spindle friction body (40) with a spindle friction surface (42) rotationally symmetric to the spindle axis of rotation. The rotary device (47a, 47b) comprises at least one drive friction body (50) with a rotationally symmetric drive friction surface (52). The drive friction body (50) can be arranged to rotate by motor about the axis of symmetry of the drive friction surface (52) not coincident with the spindle axis of rotation, wherein the drive friction surface (52) rests locally on the spindle friction surface (42) with frictional contact.