CVT Belt Lubrication Path for Saddle Surface Friction
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Solution Overview
Problem
The existing transmission belts experience friction issues between the saddle surface of the elements and the ring, leading to reduced durability and power transfer efficiency, with no specific measures described in prior art to address this problem.
Innovation Solution
A continuously variable transmission system is designed with a lubricant supply portion on the inner side of the transmission belt, featuring elements with rocking edge portions and non-contact portions that reduce contact between adjacent elements and allow lubricant to be supplied to the space between the saddle surface and the ring, thereby reducing friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission belt is looped around the pulley to transfer torque, then power transfer function is achieved, but friction occurs between the saddle surface and the ring leading to reduced durability and power transfer efficiency
Solution Approach 1:
A lubricant supply portion is introduced as an intermediary substance (lubricant) between the saddle surface and the ring to reduce direct frictional contact. The lubricant forms a protective film that mediates the interaction between these two surfaces, thereby reducing friction and wear while maintaining the torque transfer function.
Solution Approach 2:
The invention employs a lubricant supply system that utilizes hydraulic principles to deliver lubricant to the friction interface. The lubricant supply portion is configured to inject lubricant under pressure into the contact region between the saddle surface and the ring, creating a fluid film that separates the solid surfaces and reduces friction through hydrodynamic or elastohydrodynamic lubrication.
2Stability of the object's composition
If adjacent elements are brought into contact to suppress misalignment and yawing, then positional stability is improved, but friction and wear between elements increase
Solution Approach 1:
The lubricant supply portion acts as an intermediary that reduces friction between adjacent elements while allowing them to maintain contact for stability. The lubricant film enables the elements to slide past each other with reduced friction, maintaining positional stability without excessive wear.
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 design enhances the durability and power transfer efficiency of the transmission belt by minimizing friction between the ring and the saddle surface, improving the overall performance.
Implementation Method 1
a lubricant supply portion arranged on an inner side of the transmission belt in a radial direction and configured to supply a lubricant to the transmission belt... the lubricant can be supplied to the space between the saddle surface of the element and the ring by using the non-contact portion as a lubricant passage. As a result, it is possible to reduce the friction caused between the ring and the saddle surface
Data Source
AI summary
A continuously variable transmission includes a transmission belt including a plurality of elements each including a pair of pillar portions and a ring arranged between the pair of pillar portions of each of the plurality of elements, and a lubricant supply portion arranged on an inner side of the transmission belt in a radial direction. Each of the plurality of elements further includes a pair of rocking edge portions formed away from each other in a width direction, and a non-contact portion extending between the pair of rocking edge portions in the width direction along a saddle surface. A clearance that communicates the non-contact portion and a region on an inner side in the radial direction with respect to the transmission belt is formed between the elements included in a looped portion of the transmission belt around a first or second pulley.