Meshing CVT Speed Shifting for Large-Torque Slippage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current speed shifting apparatuses, particularly continuously variable transmissions, face limitations in transmitting large torque due to slippage issues in friction-based power transmission, which restricts their application in heavy-load environments.
Innovation Solution
A speed shifting apparatus utilizing meshing transmission between an outer and inner rotating wheel with sliding grooves and fixed meshing teeth, where the meshing members slide along the grooves, allowing for continuous variable speed and reduced slippage, enabling efficient transmission of large torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If friction-based power transmission is used in continuously variable transmissions, then smooth speed shifting is achieved, but slippage occurs under large torque conditions
Solution Approach 1:
The patent introduces meshing members as an intermediary mechanism between the friction-based pulleys. These meshing members engage with teeth on both the movable and fixed pulleys, providing a positive mechanical connection that prevents slippage while allowing the friction surfaces to maintain smooth operation. The meshing members act as a mediator that combines the advantages of both friction and toothed engagement.
Solution Approach 2:
The transmission system combines two different transmission mechanisms: friction-based contact for smooth operation and toothed meshing for reliable power transmission. This composite approach uses both friction surfaces and engaged teeth simultaneously, creating a hybrid system that leverages the benefits of both methods to resolve the contradiction between smooth shifting and slippage resistance.
2Ease of operation
If more gear sets are arranged to reduce transmission ratio difference, then shifting impact is reduced, but gearbox size increases
Solution Approach 1:
The patent employs a continuously variable transmission mechanism where the transmission ratio can be dynamically adjusted without discrete gear changes. The movable pulley can continuously change its effective diameter by adjusting the position of the meshing members along the conical surfaces, providing infinite transmission ratios within a range. This dynamic adjustment eliminates the need for multiple discrete gear sets while maintaining smooth transitions.
Solution Approach 2:
The transmission system changes the geometric parameters of the pulleys dynamically. By varying the effective radius of the movable pulley through the position of meshing members on conical surfaces, the transmission ratio is continuously adjusted. This parameter-based approach replaces the need for multiple gear sets with different fixed tooth counts, achieving smooth shifting within a compact structure.
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
The meshing transmission method enhances speed shifting efficiency and reduces slippage, allowing for the transmission of large torque with smooth gear changes, improving performance in heavy-load conditions compared to friction-based systems.
Implementation Method 1
a friction-type continuously variable speed shifting apparatus, mainly a continuously variable transmission (CVT)... power is transmitted by a frictional force between the steel belt and the main pulley assembly and the secondary pulley assembly
Implementation Method 2
A speed shifting apparatus utilizing meshing transmission between an outer and inner rotating wheel with sliding grooves and fixed meshing teeth
Data Source
AI summary
Embodiments of this application provide a speed shifting apparatus, a control method thereof, a steering system, and a control method thereof, and relate to the field of mechanical transmission technologies. The speed shifting apparatus includes: an outer rotating wheel; an inner rotating wheel, where a rotation axis of the inner rotating wheel is parallel to and different from a rotation axis of the outer rotating wheel; and a plurality of meshing members, arranged along a circumferential direction of the inner rotating wheel or the outer rotating wheel. Either the outer rotating wheel or the inner rotating wheel is provided with a plurality of sliding grooves, and the plurality of sliding grooves are in a one-to-one correspondence with the plurality of meshing members.