Eccentric Gear Door Drive With Self-Locking Toothed Disks
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Solution Overview
Problem
Existing drive arrangements for door devices are complex and costly due to the need for mechanical or electronic safety features to prevent unintentional door movement, and they often require additional safety catches or brakes.
Innovation Solution
A drive arrangement featuring an eccentric gear transmission with at least two orbiting toothed disks that engage via internal toothing with a driven shaft, providing a simple, cost-effective, and self-locking solution that meets safety requirements without the need for additional brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex mechanical or electronic safety arrangements are used to prevent unintentional door opening, then safety requirements are met, but device complexity and manufacturing cost increase
Solution Approach 1:
The transmission arrangement is designed to be self-locking through its inherent mechanical structure, automatically preventing unintentional door opening without requiring external safety catches, brakes, or electronic safety systems. The system serves its own safety needs through the properties of the transmission mechanism itself.
Solution Approach 2:
The invention extracts and eliminates the need for separate safety catches, brakes, and electronic safety arrangements by integrating safety functionality directly into the transmission arrangement's mechanical structure, thereby reducing overall device complexity while maintaining safety.
2Reliability
If additional safety catches and brakes are provided to prevent unintentional door movement, then safety is improved, but manufacturing and assembly costs increase
Solution Approach 1:
The invention merges the safety function with the transmission function by designing a self-locking transmission arrangement where the same mechanical components that transmit motion also provide the locking action. This consolidation eliminates the need for separate safety catches and brakes, reducing manufacturing and assembly costs.
Solution Approach 2:
The transmission arrangement performs multiple functions simultaneously: it transmits motion from the drive to the door mechanism and provides self-locking safety functionality. This multi-functionality eliminates the need for dedicated safety components, reducing overall system cost and complexity.
3Device complexity
If conventional transmission arrangements are used, then simplicity is maintained, but wear is high and precision is reduced
Solution Approach 1:
The invention employs curved cam surfaces instead of conventional straight-line or simple rotational interfaces. The cam profiles are specifically designed to provide precise motion control and smooth force transmission, reducing wear while maintaining simplicity of the overall mechanical arrangement.
4Reliability
If the transmission arrangement is designed to be self-locking, then safety is improved, but additional mechanical arrangements are required
Solution Approach 1:
The transmission arrangement achieves self-locking through its inherent mechanical geometry, where the cam surfaces and follower arrangement naturally prevent reverse motion without requiring additional locking mechanisms. The system's own structural properties provide the safety function.
Solution Approach 2:
The transmission arrangement combines multiple mechanical elements (cam profiles, followers, gears) into an integrated self-locking system where the interaction between components creates the locking effect, avoiding the need for separate mechanical safety arrangements.
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 proposed drive arrangement achieves high precision and low wear, is self-locking, and meets safety requirements by using multiple orbiting toothed disks, thus reducing manufacturing and assembly costs while ensuring reliable operation.
Implementation Method 1
The transmission arrangement (12) comprises an eccentric gear transmission (17) which comprises at least two orbiting toothed disks (52, 54, 56) each of which comprise an internal toothing. The at least two orbiting toothed disks are configured to be driven by the at least one eccentric drive shaft (72, 74, 76).
Data Source
AI summary
A drive arrangement for a door device which includes a door member. The drive arrangement includes a door shaft, a driven shaft which is operatively connected to the door shaft, a transmission arrangement which drives the door shaft, and at least one electric motor which is coupled to the transmission arrangement to move the door member of the door device from a closed state to an open state and vice versa. The at least one electric motor has at least one eccentric drive shaft. The transmission arrangement includes an eccentric gear transmission which has at least two orbiting toothed disks, each of which have an internal toothing. The at least two orbiting toothed disks are driven by the at least one eccentric drive shaft of the at least one electric motor, and, via the internal toothing, engage with the driven shaft.