CVT Side Cover Lubrication Pipe Layout for Stable Bearing Oil Supply
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Solution Overview
Problem
The use of leaked working oil as a lubricant in driving force transmission apparatuses leads to fluctuations in lubricant amount, necessitating a more stable lubricant supply method.
Innovation Solution
A driving force transmission apparatus is designed with a lubrication pipe system that includes a case member with supporting portions for bearings, a lubricant path connecting these portions, and a boss portion for inserting the lubrication pipe, which is positioned between bolt holes to enhance strength and stability of lubricant supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If leaked working oil is used as lubricant, then the lubrication system is simple, but the lubricant amount fluctuates
Solution Approach 1:
A lubricant supply pipe is introduced as an intermediary component to deliver lubricant from the lubricant supply port to the bearing. This mediator ensures stable lubricant supply by providing a dedicated conduit, resolving the contradiction between system simplicity and lubricant amount stability.
Solution Approach 2:
The lubrication system is segmented into distinct functional components: lubricant supply port, lubricant supply pipe, boss portion, and bearing. This segmentation allows each component to perform its specific function optimally, with the pipe ensuring stable delivery and the boss portion providing structural support, thereby maintaining reliability while keeping the overall system relatively simple.
2Reliability
If lubrication pipe is extended to supply lubricant stably, then lubricant amount stability improves, but device complexity increases
Solution Approach 1:
The boss portion serves multiple functions: it provides structural support for the lubrication pipe, reinforces the case member at a critical location, and facilitates the connection between the lubricant supply pipe and the bearing. By merging these functions into a single integrated component, the system achieves stable lubricant supply without proportionally increasing complexity.
Solution Approach 2:
The boss portion is designed as a multi-functional element that simultaneously acts as a support structure for the lubrication pipe, a reinforcement feature for the case member, and a mounting feature for bolts. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving stable lubricant delivery.
3Strength
If boss portion is positioned between bolt holes, then structural strength improves, but manufacturing precision requirements increase
Solution Approach 1:
The boss portion is pre-positioned between the bolt holes during case member manufacturing, before final assembly. This preliminary positioning ensures that the structural reinforcement is built into the base structure, and the subsequent bolt hole drilling can be performed with standard precision rather than requiring high-precision positioning of the boss portion itself.
Data Source
AI summary
A side cover of a continuously variable transmission includes a recess portion supporting a bearing and a recess portion supporting a bearing. The recess portions are connected to each other through a lubricant path. An oil path into which a small diameter portion of a pipe-shaped member is inserted and a connection oil path connecting between the oil path and the lubricant path are connected to each other via a boss portion. The side cover includes a circumference wall portion provided with a plurality of bolt holes. The boss portion is disposed at a position between two of the bolt holes adjacent to each other in a circumference direction.