Toroidal CVT Outlet Placement for Power Roller Cooling and Lubrication
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Solution Overview
Problem
In toroidal continuously variable transmissions, the oil feed for lubrication and cooling is inefficient due to oil scattering in the air before reaching the cooling target, leading to inadequate lubrication and cooling of the power roller.
Innovation Solution
The arrangement of lubrication and cooling outlets is optimized such that the cooling outlet discharges oil closer to the power roller than the lubrication outlet, ensuring quicker oil delivery for effective cooling and reliable lubrication, with the cooling outlet positioned to reach the power roller's surface in a shorter distance than the lubrication outlet, and the outlets are integrated into the holder to simplify the transmission's configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling outlet discharges oil from a longer distance, then the lubrication coverage area increases, but the oil scatters in the air and fails to reach the cooling target efficiently
Solution Approach 1:
The invention divides the single oil discharge function into two separate outlets: a cooling outlet positioned close to the power roller for direct cooling, and a lubrication outlet positioned for optimal lubrication coverage. This segmentation allows each outlet to perform its specific function efficiently without the oil scattering problem affecting both functions simultaneously.
Solution Approach 2:
The invention applies different oil discharge characteristics to different locations: the cooling outlet is positioned with a short discharge distance directly adjacent to the power roller surface, while the lubrication outlet is positioned to cover the contact interface area. This local differentiation ensures that cooling receives direct, concentrated oil flow while lubrication receives broader coverage, resolving the contradiction between cooling efficiency and oil scattering.
2Reliability
If the lubrication outlet is positioned closer to the contact interface, then lubrication effectiveness improves, but the cooling effectiveness decreases due to oil scattering
Solution Approach 1:
The invention separates the lubrication and cooling functions into distinct outlets with different positional characteristics. The lubrication outlet is optimized for contact interface coverage, while the cooling outlet is optimized for direct power roller surface contact, eliminating the trade-off between the two functions.
Solution Approach 2:
The holder structure serves as an intermediary that integrates both outlets in optimal positions. By incorporating both the cooling outlet and lubrication outlet into the holder, the system achieves coordinated delivery of oil to both the power roller surface and the contact interface without interference between the two functions.
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
This configuration ensures efficient and reliable lubrication at contact interfaces and cooling of the power roller, preventing oil scattering and maintaining the transmission's efficiency by directing oil directly to the high-temperature regions of the power roller.
Implementation Method 1
a cooling outlet that discharges the oil toward the power roller... the oil discharged from the cooling outlet reaches the circumferential surface of the power roller quickly
Implementation Method 2
a lubrication outlet that discharges an oil toward a contact interface between the input or output disc and the power roller... lubrication at the contact interface can be reliably achieved
Data Source
AI summary
Provided is a toroidal continuously variable transmission that can achieve suitable oil feed both for lubrication at contact interfaces between a power roller and discs and for cooling of the power roller; and a drive mechanism-integrated electricity generation apparatus for an aircraft, the electricity generation apparatus including the toroidal continuously variable transmission. The toroidal continuously variable transmission includes at least one lubrication outlet that discharges an oil toward at least one contact interface between an input or output disc and the power roller; and at least one cooling outlet that discharges the oil toward the power roller. The cooling outlet and the lubrication outlet are arranged such that a distance between the cooling outlet and a point at which the oil discharged from the cooling outlet contacts the power roller is smaller than a distance between the lubrication outlet and the contact interface.