Rotary Drive for Pivoting Door with Intermediate Shaft
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Solution Overview
Problem
Existing rotary drives for sashes, such as doors and windows, face challenges in ensuring safe and compact operation, particularly during power failures or fires, where automatic closure is critical but often compromised by the need for complex and costly energy storage solutions.
Innovation Solution
A rotary drive system featuring a motor-automated design with a power storage module, utilizing a linear force storage module and an intermediate shaft to transmit torque efficiently, ensuring safe closure of sashes through a cam mechanism that stores energy for both opening and closing operations, and is compact and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power storage module with rigid transmission elements is used to ensure safe closure during power failures, then reliability is improved, but device complexity increases
Solution Approach 1:
An intermediate shaft is introduced as a mediator between the cam disk and the output shaft. This intermediate shaft carries a roller lever that translates the cam disk's rotational movement into linear motion of the power storage module while simultaneously transmitting torque. This intermediary component simplifies the overall transmission system by decoupling the cam disk rotation from direct output shaft connection, thereby maintaining reliability without excessive complexity.
Solution Approach 2:
The patent replaces complex multi-stage gear transmissions with a simplified mechanical system using a cam disk, roller lever, and intermediate shaft. The cam disk's circumferential pressing surface directly engages with the roller lever, converting rotational motion to linear motion of the power storage module in a single stage, eliminating the need for multiple gear stages and reducing overall system complexity while maintaining torque transmission capability.
2Power
If an intermediate shaft with roller lever is introduced for torque transmission, then torque transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The roller lever utilizes a cylindrical roller that rotates on the intermediate shaft, converting the cam disk's circumferential pressing force into efficient torque transmission. The curved rolling surface of the roller lever maintains continuous contact with the cam disk's circumferential pressing surface, ensuring smooth torque transmission with minimal friction losses. This curved mechanical interface improves power transmission efficiency compared to rigid angular connections.
3Volume of moving object
If the power storage module is arranged on the motor side of the intermediate shaft, then compactness is improved, but ease of operation deteriorates
Solution Approach 1:
The power storage module is nested within the motor housing on the motor side of the intermediate shaft, utilizing the existing motor housing space. The linear actuator is positioned concentrically within the motor assembly, with its rod extending toward the intermediate shaft. This nested arrangement maximizes space utilization, placing the power storage module within the motor's footprint rather than requiring additional external space, thereby achieving compact integration.
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
The system ensures reliable and efficient automatic operation of sashes during power failures or emergencies, providing a compact and cost-effective solution for energy storage and torque transmission, enabling safe closure and opening mechanisms.
Implementation Method 1
The door drive can be powered, at least temporarily, by an energy storage device (compression spring or hydraulic system). When a user moves the door leaf from a starting position (e.g., door closed) to an end position (e.g., door open), the energy storage device (e.g., via a compression spring) can absorb and temporarily store energy before releasing it to move the door leaf back from the end position to the starting position.
Implementation Method 2
For this purpose, swing door drives typically feature a cam disc with a rolling surface mounted on an output shaft, preventing rotation. A cam roller, pressed against this rolling surface by a operative connection with the energy storage device, allows the energy storage device to exert a torque on the output shaft.
Implementation Method 3
a roller lever rotatably mounted on the intermediate shaft with a cam roller provided at a distance from the intermediate shaft, wherein the cam roller is pressed circumferentially against the cam disc and interacts with the output shaft
Data Source
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AI summary
The present invention relates to a rotary drive for at least one leaf/casement, in particular a door leaf or a window casement, comprising: at least one output shaft (330) for coupling to the at least one leaf/casement; at least one motor (20), which acts on the output shaft (330) via at least one downstream gear mechanism (30); an energy-store module (112), which has a linear line of action and uses transmission elements (14, 32, 326) to subject the circumference of an eccentric cam disc (331), arranged in a rotationally fixed manner on the output shaft (330), to pressure; and an intermediate shaft (320), which is offset in relation to the line of action of the energy-store module (112) and is provided between the motor (20) and output shaft (330). The rotary drive is characterized in that the transmission elements (14, 32, 326) comprise a roller lever (32), which is mounted in a rotatable manner on the intermediate shaft (320) and has a cam-follower roller (326) spaced apart from the intermediate shaft (320), wherein the cam-follower roller (326), pressed circumferentially against the eccentric cam disc (331), interacts with the output shaft (330), and the energy-store module (112) is arranged on the motor side in relation to the intermediate shaft (320). The present invention also relates to a clamping piece for connection to the output shaft (330), wherein the clamping piece has a lateral lever which interacts with an eccentrically mounted and steplessly adjustable stop element.