Elevator Actuator Resetting Device Using Planetary Gear Transmission
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Solution Overview
Problem
Conventional resetting devices for elevator actuators require high force levels, leading to large electric motors and unwanted stresses and displacements due to bending of the motor support in ropeless overspeed governor systems.
Innovation Solution
A resetting device using a transmission means with a positive gear ratio to apply resetting force to the actuation spring, combined with an electromagnetic clutch for interrupting force transmission, allowing a small electric motor and reducing stresses and displacements, and incorporating a planetary gear set for a compact and robust design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional resetting device with a linear motor (spindle drive) is used to compress the actuation spring, then the actuator can be reset, but the force levels required are very high causing the electric motor to be large and the motor support to bend
Solution Approach 1:
A transmission means (gear mechanism) is introduced as an intermediary between the electric motor and the actuation spring. The gear mechanism with positive gear ratio transmits the resetting force from the motor to the spring, enabling a small motor to generate sufficient compression force through mechanical advantage while avoiding direct high-force requirements on the motor and its support structure
Solution Approach 2:
The gear mechanism changes the force parameter through a positive gear ratio, transforming the low-force output of a small electric motor into the high-force requirement for compressing the actuation spring. This parameter transformation allows the system to meet force requirements without scaling up motor size
2Force
If a conventional resetting device with a linear motor (spindle drive) is used to compress the actuation spring, then the actuator can be reset, but high force levels cause unwanted stresses and displacements due to bending of the motor support
Solution Approach 1:
The gear mechanism serves as a mediator that decouples the high-force requirement from the motor support structure. By introducing mechanical advantage through gears, the system transmits force to the spring without requiring the motor support to withstand high bending stresses, thus eliminating the unwanted stresses and displacements
3Reliability
If a ropeless overspeed governor system is used, then the safety gear can be activated by an actuator with an actuation spring, but the actuation spring needs to be stronger requiring higher force for resetting
Solution Approach 1:
The transmission means with positive gear ratio acts as an intermediary that bridges the gap between the small electric motor's output force and the high force requirement of the strengthened actuation spring. This allows the system to maintain reliable safety gear activation with a stronger spring while using a compact motor through mechanical force multiplication
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 the use of a smaller, cost-efficient electric motor with reduced stresses and displacements, ensuring quick and reliable operation of the safety gear even during power breakdown.
Implementation Method 1
A resetting device (1) for resetting an actuator (2; 102) for actuating a safety gear (14; 114) of an elevator is proposed. The resetting device comprises an electric motor (3; 103), a transmission means (4; 104), an electromagnetic clutch (5; 105)
Implementation Method 2
the holding magnet is activated such that the catch 43a and the holding device 34 are engaged
Data Source
AI summary
A resetting device for resetting an actuator for actuating a safety gear of an elevator includes an actuation spring to be brought into a compressed state by a resetting force, an electric motor for providing the resetting force and a transmission for transmitting the resetting force of the electric motor to the actuation spring. The transmission provides a positive gear ratio.