Elevator Drive Shaft Axial Stop Torque Transmission
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Solution Overview
Problem
Existing drive shafts for elevator systems face challenges in providing a strong and efficient connection between separate support and traction sheaves, particularly with small component sizes where groove-based connections weaken the structural integrity.
Innovation Solution
A drive shaft design featuring axially projecting traction sheave-side circumferential stops that engage with support shaft-side stops, eliminating the need for radial stops and allowing for a more efficient use of radial space, with guide faces having circular cross sections to avoid weakening, and a sleeve-like traction sheave configuration to optimize strength and minimize weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a groove-based connection is used between support shaft and traction sheave, then a drive face can be provided for torque transmission, but the structural integrity and strength of the components are weakened
Solution Approach 1:
The invention transitions from radial groove-based torque transmission to axial key-based torque transmission. Instead of cutting grooves radially into the components, a rectangular key protrudes axially from the support shaft and engages with a corresponding rectangular recess in the traction sheave. This dimensional shift from radial to axial engagement allows full-strength components while maintaining effective torque transmission.
2Volume of moving object
If the component size is reduced for small-diameter traction sheaves, then device compactness is improved, but the ability to withstand high mechanical loading is compromised
Solution Approach 1:
The invention changes the geometric parameters of the connection interface by using a rectangular key profile instead of a radial groove profile. This parameter change allows the torque transmission surface area to be increased relative to the component volume, enabling small-diameter traction sheaves to withstand high mechanical loads through optimized stress distribution in the key connection.
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 enhances the structural integrity and stability of the drive shaft, enabling efficient torque transmission and balancing while minimizing component size and weight, particularly beneficial for small-diameter traction sheaves under high mechanical loading.
Implementation Method 1
The connection comprises at least one axially projecting traction sheave-side circumferential stop which is in positively locking engagement with a support shaft-side circumferential stop.
Data Source
AI summary
A drive shaft for an elevator system, includes a support shaft and a traction sheave with at least one traction face for driving a traction mechanism, for example a drive belt, of the elevator system. A connection is provided for the transmission of a drive torque from the support shaft to the traction sheave, the traction sheave being of separate configuration from the support shaft. The traction sheave is held with an inner guide face on an outer guide face of the support shaft. The connection includes at least one axially projecting traction sheave-side circumferential stop which is in positively locking engagement with a support shaft-side circumferential stop.