Toroidal CVT Power Roller Sealing for Oil Leakage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In toroidal continuously variable transmissions, a through hole in the power roller inner ring for processability and conveyability leads to oil leakage and reduced rigidity.
Innovation Solution
A toroidal continuously variable transmission design that includes a power roller with a power roller inner ring having an inner ring hole extending axially and an end surface hole communicating with the inner ring hole, which is closed by a separate closing member to reduce oil leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a through hole is provided in the power roller inner ring for processability and conveyability, then manufacturing and assembly are facilitated, but oil leakage occurs and rigidity decreases
Solution Approach 1:
The through hole is segmented into two parts: an inner ring hole extending axially through the power roller inner ring, and an end surface hole communicating with the inner ring hole at the inner end surface. This segmentation allows the hole to be closed at the end surface by a closing member, preventing oil leakage while maintaining the benefits of the through hole for manufacturing and assembly.
Solution Approach 2:
A closing member is introduced as an intermediary element to close the end surface hole. This closing member prevents oil from leaking through the hole while allowing the hole to remain open for manufacturing and assembly purposes. The closing member acts as a mediator that reconciles the conflicting requirements of having an open through hole versus preventing oil leakage.
2Ease of manufacture
If a through hole is provided in the power roller inner ring, then processability and conveyability are improved, but rigidity of the power roller decreases
Solution Approach 1:
The hole structure is segmented to extend only partially through the power roller inner ring in the axial direction, rather than completely through. This segmentation reduces the loss of structural integrity and rigidity compared to a complete through hole, while still providing sufficient access for manufacturing and assembly operations.
Data Source
AI summary
A toroidal continuously variable transmission. A power roller (40) of the transmission includes a power roller inner ring (50) sandwiched between both disks (1, 2), a power roller outer ring (60) provided in a trunnion (35) and rotatably supporting the power roller inner ring (50), and an inner ring hole (52) provided in the power roller inner ring (50) to extend in an axial direction of the power roller inner ring (50), in which an end surface hole (58) communicating with an inner ring hole (52) is provided in an inner end surface (54) of the power roller inner ring (50), and the end surface hole (58) is closed by a closing member (80) separate from the power roller inner ring (50).