Driven Pulley Modular Roller Mounting for CVT Assembly
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Solution Overview
Problem
Current continuously-variable transmissions (CVTs) face challenges in reducing manufacturing costs while maintaining weight reduction and compactness, particularly in the design of driven pulleys.
Innovation Solution
The driven pulley design incorporates a first sheave with symmetrically disposed ramps and a second sheave with rollers and mounting supports, utilizing an annular member and axles with recesses for roller mounting, allowing for easy assembly and replacement, and featuring a spring for torque transmission and noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional driven pulley design with integrated roller mounting is used, then structural integrity is maintained, but manufacturing cost increases and maintenance difficulty increases
Solution Approach 1:
The driven pulley is divided into separate modular components: the pulley body, rollers, and mounting supports are distinct replaceable parts rather than an integrated structure. This segmentation allows independent manufacturing and replacement of worn components without replacing the entire pulley assembly, reducing manufacturing costs and facilitating maintenance.
Solution Approach 2:
The mounting supports are designed to be removable and reconfigurable, allowing the system to transition between different operational states. The dynamic capability to disassemble and reassemble components enables cost-effective manufacturing through specialized production of individual parts and simplifies maintenance operations.
2Ease of repair
If rollers are permanently fixed to the sheave, then structural stability is improved, but maintenance and component replacement become difficult
Solution Approach 1:
The roller mounting system is segmented into removable mounting supports that can be detached from the sheave. This allows individual rollers to be replaced independently while maintaining the overall structural integrity of the pulley assembly during normal operation.
Solution Approach 2:
The mounting supports are pre-configured with receptacles and fastening mechanisms that facilitate quick roller installation and removal. This preliminary preparation of the mounting structure enables rapid component replacement during maintenance without requiring complex disassembly procedures.
3Power
If more rollers and mounting supports are added to the driven pulley, then torque transmission efficiency improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The mounting supports serve multiple functions: they provide structural attachment points for rollers, facilitate easy roller replacement, and can be configured in different patterns. This multi-functionality allows the same component design to support various roller arrangements optimized for different torque transmission requirements without proportionally increasing complexity.
Solution Approach 2:
The number, position, and configuration of rollers and mounting supports can be adjusted as design parameters to optimize torque transmission for specific applications. The modular design allows selective addition or removal of rollers based on power transmission requirements without fundamentally changing the pulley 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
This design enhances the efficiency and durability of torque transmission, reduces noise, and simplifies maintenance by allowing for easy replacement of components, while potentially lowering manufacturing costs.
Implementation Method 1
This is counterbalanced in part by a return force, which is typically generated by a spring inside the driven pulley or another biasing mechanism.
Implementation Method 2
The cam system typically comprises a cam plate having a plurality of symmetrically-disposed and inclined ramps on which respective cam followers are engaged.
Implementation Method 3
when the rotation speed of the driving pulley increases, its movable sheave moves closer to the fixed sheave thereof under the effect of a centrifugal mechanism.
Data Source
AI summary
The driven pulley (10) comprises a first sheave (12) and a second sheave (40) coaxially mounted around a main shaft. The first sheave (12) is fixed with reference to the main shaft while the other sheave (40) is allowed to slide and rotate with reference to the main shaft. The driven pulley (10) is designed with a roller mounting unit (74) facilitating the assembling or the replacement of the rollers (70).