Magnetic Wobble Transmission With Ferromagnetic Teeth Assembly
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Solution Overview
Problem
Existing magnetic wobble gears require complex manufacturing processes due to the use of brittle permanent magnets, which increase production time, cost, and assembly difficulty, and are dependent on an external power supply.
Innovation Solution
The stator and rotor are made from ferromagnetic materials, with a magnet arranged transversely to the toothed rows, allowing for easy machining and assembly, and a ring magnet is used to ensure a homogeneous magnetic field distribution, optionally supplemented by an electromagnet for torque adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional wobble transmission design is used, then the structure is relatively simple, but the transmission accuracy deteriorates due to clearance between meshing teeth
Solution Approach 1:
The gear body is divided into a tooth root portion and a tooth crown portion that are selectively movable relative to each other. The tooth crown portion can rotate independently about an axis extending along the tooth width direction, allowing the meshing teeth to adaptively adjust and eliminate clearance without requiring complete redesign of the entire gear structure.
Solution Approach 2:
The gear structure transitions from a static rigid design to a dynamic adaptive design. The tooth crown portion is designed to rotate dynamically in response to meshing forces, enabling the transmission system to automatically compensate for clearance variations during operation while maintaining high transmission accuracy.
2Manufacturing precision
If the gear structure is made more complex to improve transmission accuracy, then the manufacturing cost increases
Solution Approach 1:
By segmenting the gear into movable tooth crown and tooth root portions, the patent achieves high transmission accuracy through a relatively simple manufacturing process. The segmented design allows for conventional manufacturing methods to be used while still obtaining precision-adaptive performance, avoiding the need for expensive complex mechanisms.
Solution Approach 2:
The gear structure performs self-adjustment through the automatic rotation of the tooth crown portion in response to meshing clearance. This self-service mechanism eliminates the need for external adjustment devices or complex control systems, thereby reducing manufacturing costs while maintaining high transmission accuracy.
3Manufacturing precision
If clearance is reduced to improve transmission accuracy, then the force transmission between meshing teeth deteriorates
Solution Approach 1:
The dynamic rotation of the tooth crown portion allows the gear to maintain optimal meshing contact under varying force conditions. When force is applied, the tooth crown rotates to adjust the meshing position, ensuring both high transmission accuracy and effective force transmission are achieved simultaneously through adaptive positioning.
Solution Approach 2:
The patent changes the positional parameter of the tooth crown portion dynamically during operation. By allowing the tooth crown to rotate and change its position relative to the tooth root, the system adapts the meshing parameters to simultaneously achieve high transmission accuracy and maintain strong force transmission capability.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a wobble transmission, comprising: - an input shaft (1); - an output shaft (2); - a stator (4), which has, peripherally, at least one row of teeth (3); - a rotor (6), which has, peripherally, at least one row of teeth (5) and is freely rotatably mounted on a shaft portion (7), which shaft portion is rigidly connected to the input shaft (1) and is tilted by an angle relative to the input shaft (1), the rotor being spaced apart from the stator (4) by a peripherally continuous air gap (8) lying directly between the rows of teeth of the stator (4) and of the rotor (6); and - at least one magnet (9) for producing a magnetic flux between the rotor (6) and the stator (4); wherein the rotor (6) and the stator (4) each have a different number of rows of teeth (3, 5), and axially adjacent rows of teeth (3, 5) of the stator (4) and of the rotor (6) are arranged at a mutual rotational offset. According to the invention, in order to allow simple processing of the magnetic components of the wobble transmission, despite efficient, magnetic coupling properties and a precisely determinable pattern of field lines, and thus to facilitate the assembling of the magnetic wobble transmission, the stator (4) and the rotor (6) are ferromagnetic and the dipole of the magnet (9) runs perpendicularly to a plane spanned by a row of teeth.