Gearbox With Synchronous Planetary Gears For Low Vibration
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Solution Overview
Problem
Existing gearboxes used in power lift gates for automobiles experience vibration and noise issues due to high-frequency use, leading to potential safety hazards and reduced service life, primarily because of the multi-stage planetary gearing mechanism.
Innovation Solution
A gearbox design featuring a single planetary gear with a first and second gear rotating synchronously, a mounting shaft to reduce friction and parts count, and a gap between the planetary gear and the rotating frame to minimize vibration and noise, along with a protrusion to prevent sun gear displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a multi-stage planetary gearing mechanism is used, then the transmission ratio is increased, but vibration and noise increase during high-speed rotation
Solution Approach 1:
The planetary gear is divided into two independent rotating parts that can rotate relative to each other, allowing the first gear part to engage with the sun gear while the second gear part engages with the ring gear, distributing the transmission load and reducing vibration and noise during high-speed rotation
2Duration of action of moving object
If high-frequency use occurs, then the support function is maintained, but internal parts loosen causing safety hazards
Solution Approach 1:
The planetary gear is designed with dynamic adjustment capability where the two gear parts can rotate relative to each other, allowing the system to adapt to high-frequency use conditions and prevent internal parts from loosening, thereby maintaining safety and reliability throughout the service life
3Force
If the planetary gear contacts the rotating frame, then support is provided, but friction increases causing more vibration and noise
Solution Approach 1:
A mounting shaft is introduced as an intermediary component between the planetary gear and the rotating frame, allowing the planetary gear to rotate on the mounting shaft while the mounting shaft rotates on the rotating frame, thereby reducing direct friction contact and minimizing vibration and noise
Data Source
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AI summary
A gearbox (20) includes a sun gear (30), a plurality of planetary gears (40) meshed with the sun gear (30), a rotating frame (60) supporting the planetary gears (40), and a housing with an internal ring gear (71) meshed with the planetary gears (40). The the planetary gears (40) includes a first gear (41) and a second gear (42) coaxially connected to each other along an axial direction and rotating synchronously, the first gear (41) meshed with the sun gear (30), and the second gear (42) meshed with the internal ring gear (71) of the housing (70). The rotating frame (60) received in the housing (70) has an upper frame (61) and a lower frame (62) with a central hole, each of the plurality of planetary gears (40) is arranged between the upper frame (61) and the lower frame (62) by a mounting pin (50), the lower frame (62) is supported by a flange (80) connected to the housing (70), the sun gear (30) is driven to rotate so as to operate the rotating frame (60). The gearbox (20) of the present disclosure has low vibration and low noise.