Winding Drum Drive Unit Torque Reduction
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Solution Overview
Problem
Existing drive units for traction devices in stage technology require high torque to rotate the winding drum against tensile force, especially when a significant length of the flat belt is wound, leading to a large effective diameter and increased axial length, which is inefficient and noisy.
Innovation Solution
A cylindrical drive area is integrated on the winding drum adjacent to the receiving area, allowing the belt-shaped drive means to wind or unwind, generating torque through its own tensile force, reducing the need for high torque and enabling a smaller gear unit with a shorter axial length, and incorporating a self-locking gear and independent brakes for secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flat belt is used as a traction means and wound onto the winding drum, then the axial length can be kept short, but a high torque is required to rotate the winding drum against the tensile force of the load
Solution Approach 1:
The winding drum is divided into two distinct areas: a receiving area for the flat traction belt and a separate cylindrical drive area for the drive means. This segmentation allows the drive means to wind onto itself and generate torque internally, rather than requiring external high-torque transmission to the winding drum, thus reducing the torque requirement while maintaining short axial length
Solution Approach 2:
The belt-shaped drive means acts as an intermediary element between the motor and the winding drum. It transmits torque by winding onto itself on the cylindrical drive area, converting motor rotation into torque generation through its own tensile force, thereby mediating the power transmission without requiring direct high-torque coupling to the winding drum
2Power
If a large torque is generated to rotate the winding drum against tensile force, then the load can be lifted, but the gear unit must be large and the axial length increases
Solution Approach 1:
The drive means serves itself by winding onto the cylindrical drive area and generating its own drive torque through its tensile force during winding. This self-service mechanism eliminates the need for a large gear unit to generate high torque externally, allowing the system to maintain lifting capability while keeping the axial length short
3Device complexity
If the drive means is wound onto the winding drum to generate torque, then the system is compact, but the drive means may lose tension and become detached when traction means tension decreases
Solution Approach 1:
A torsion tension spring is introduced as a counterbalancing element that prestresses the winding drum against the direction of rotation that tensions the traction means. This creates a constant opposing force that maintains tension on the drive means, preventing it from becoming loose or detaching, thereby ensuring reliable retention while maintaining system compactness
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 design reduces the rotational torque requirement, minimizes noise, and allows for a compact drive unit with a small axial length, ensuring reliable and quiet operation, even with varying winding diameters and tensions.
Implementation Method 1
the winding drum is set in rotation by the tensile force of a belt-shaped drive means wound onto itself, with a comparatively low tensile force of a drive means being sufficient
Implementation Method 2
the winding drum is coupled to a torsion tension spring, which prestresses the winding drum against a direction of rotation that tensions the at least one traction means
Data Source
Figure 1
Figure 2~4
AI summary
A drive unit for at least one traction means, especially in stage machinery, with a winding drum comprising at least one take-up region, on (each of) which a traction means is received which can be wound up or unwound, characterized in that axially adjacent to the take-up region there is a cylindrical drive region disposed on the winding drum, on which is received a belt-shaped drive means that can be wound up or unwound and which can be wound up onto a drivable drive drum, generating a drive torque acting on the winding drum, or can be unwound from the drive drum, releasing the winding drum.