Continuously Variable Transmission Coaxial Nested Shaft Design
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Solution Overview
Problem
The existing continuously variable transmission structure faces challenges in achieving a coaxial arrangement and compact structure when applied to hybrid power transmission, due to the location of the bucket wheel planet gear set between the first and second planet gear sets, and the hollow first shaft and third shaft configurations, leading to complex assembly and volume issues.
Innovation Solution
The solution involves reconfiguring the continuously variable transmission by locating the bucket wheel planet gear set outside the first planet gear set, with the third shaft connected to the bucket wheel sun gear as a hollow structure, allowing the first shaft to penetrate through the third shaft, enabling coaxial assembly and a compact structure suitable for hybrid power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bucket wheel planet gear set is located between the first planet gear set and the second planet gear set with hollow shafts configuration, then the transmission can be assembled, but the structure becomes complex and coaxial arrangement cannot be achieved
Solution Approach 1:
The invention places the first planet gear set inside the bucket wheel planet gear set by making the first shaft pass through the hollow third shaft. This nested configuration allows the first shaft to be coaxially arranged with the third shaft, achieving the desired coaxial arrangement while simplifying the overall structure. The first sun gear is positioned inside the bucket wheel sun gear, and the first planet gears mesh with both the first sun gear and the second planet gear, creating a compact nested layout.
2Adaptability or versatility
If the first shaft and third shaft are both hollow structures for hybrid power transmission, then hybrid power connection is enabled, but the assembly structure becomes difficult and volume increases
Solution Approach 1:
The first shaft is made to pass through the hollow third shaft, creating a nested shaft configuration. This allows both shafts to maintain their hollow structures for hybrid power transmission while occupying the same spatial envelope. The first shaft carries the first sun gear and first planet gears, while the third shaft carries the bucket wheel sun gear and bucket wheel planet gears. This nested arrangement significantly reduces the overall volume compared to having two separate hollow shafts side by side.
3Ease of operation
If the bucket wheel planet gear set is repositioned outside the first planet gear set, then coaxial arrangement is achieved, but the thickness of the transmission system increases
Solution Approach 1:
The invention resolves the thickness issue by utilizing the radial dimension through the hollow shaft configuration. Instead of arranging gear sets side by side in the axial direction (which would increase thickness), the first planet gear set is positioned radially inside the bucket wheel planet gear set. The first shaft passes through the third shaft in the radial direction, allowing both gear sets to be coaxially arranged without increasing the axial thickness of the transmission system.
Data Source
AI summary
Provided is a continuously variable transmission, comprising an outer shell (1), wherein a middle shell (101) is provided in the middle of the outer shell (1), two sides of the middle shell (101) are respectively provided with a first end cover (102) and a second end cover (103), a third shaft (12) is arranged in the middle of the first end cover (102) in a penetrating manner, the third shaft (12) is connected to a bucket-wheel sun gear (501), the inside of the third shaft (12) is a hollow structure, a second shaft (11) is arranged in the middle of the second end cover (103) in a penetrating manner, the second shaft (11) is connected to a second sun gear (401), the middle of a first sun gear (301) is fixedly provided with a first shaft (10), the first shaft (10) passes through the third shaft (12), the inside of which is a hollow structure, in a penetrating manner, and the radius of rotation of a bucket-wheel planetary gear (502) rotating around the bucket-wheel sun gear (501) is greater than the radius of rotation of a second planetary gear (402) rotating around the second sun gear (401) and the radius of rotation of a first planetary gear (302) rotating around the first sun gear (301). The continuously variable transmission solves the technical problems of it being difficult, when a continuously variable transmission is applied to hybrid power transmission, to achieve arrangement in the same axis and complicated hybrid power assembly structure when a first shaft is connected to an engine or an output device and a third shaft is connected to an electric motor and can be widely applied to the field of transmission.