CVT Pulley Misalignment Reduction via Dynamic Shaft Positioning
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Solution Overview
Problem
In belt-type continuously variable transmissions, misalignment due to frictional forces between elements leads to stress concentration at contact points, reducing durability and increasing power loss.
Innovation Solution
A configuration that includes a primary and secondary pulley with moving sheaves and a moving apparatus to adjust the relative positional relationship between the pulleys, allowing for reduction in misalignment by changing the shaft-to-shaft or sheave-surface-to-sheave-surface distance, and incorporating a hydraulic actuator or feed screw to move the pulleys and bearings to minimize misalignment and meshing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an angular difference is provided between the primary and secondary pulley shafts to restrain belt misalignment, then belt misalignment is reduced, but frictional force causes element direction change, stress concentration, decreased durability, and increased power loss
Solution Approach 1:
The invention makes the pulley shafts dynamically adjustable rather than fixed at angular positions. The moving apparatus enables real-time adjustment of shaft positions to optimize belt alignment under varying operating conditions, eliminating the need for fixed angular offsets that cause frictional element direction changes
Solution Approach 2:
The invention changes the positional parameters of the pulley shafts dynamically. By adjusting the relative position between primary and secondary shafts using the moving apparatus, the system optimizes belt alignment without relying on fixed angular differences, thereby preventing stress concentration and element direction changes
2Manufacturing precision
If an angular difference is provided between the primary and secondary pulley shafts, then belt misalignment is restrained, but power loss increases due to frictional forces
Solution Approach 1:
The system transitions from static angular positioning to dynamic positional adjustment. The moving apparatus allows the shafts to be repositioned based on actual alignment needs, minimizing frictional forces and power loss while maintaining proper belt alignment
Solution Approach 2:
The invention replaces the mechanical approach of using fixed angular offsets with a movable positioning system. This substitution allows for optimized alignment that minimizes frictional power loss while maintaining belt alignment precision
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 effectively reduces misalignment, enhancing the durability of the transmission belt and reducing power loss by optimizing the positional relationship between pulleys and gears, thereby improving the overall performance of the continuously variable transmission.
Implementation Method 1
a moving apparatus that integrally moves either the primary shaft and a primary bearing supporting the primary shaft or the secondary shaft and a secondary bearing supporting the secondary shaft
Implementation Method 2
a direction of an element is changed due to a frictional force generated between the element and a ring
Data Source
AI summary
A continuously variable transmission is configured such that a transmission ratio continuously changes by continuously changing widths of belt winding grooves of a primary pulley and a secondary pulley, and includes: the primary pulley including a first fixed sheave and a first moving sheave provided in a primary shaft; the secondary pulley including a second fixed sheave and a second moving sheave provided in a secondary shaft; a metal transmission belt wound around the primary pulley and the secondary pulley; and a moving apparatus configured to integrally move the secondary shaft and a secondary bearing supporting the secondary shaft such that a relative positional relationship between the first fixed sheave and the second fixed sheave changes.