Belt Drive Transmission with Differential Coupling
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Solution Overview
Problem
Existing belt drive transmission systems for vehicles, such as agricultural tractors, face high component failure and increased service costs due to stress from continual drive direction changes between forward and reverse drives, and are often expensive and heavy.
Innovation Solution
A belt drive transmission system with a differential coupling that uses two belt drives with adjustable input:output ratios to provide a continuously variable transmission, allowing for wide variation in drive speed with minimal weight and cost, and featuring a forward-reverse selector to manage drive direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a belt drive system is used to provide continuously variable transmission, then the system cost and weight are reduced, but component failure increases due to stress from continual drive direction changes
Solution Approach 1:
The transmission system is segmented into two separate belt drives (first and second belt drives) that operate in opposite directions. Each belt drive handles one direction of rotation, preventing the stress of continual direction changes from affecting a single belt. This segmentation resolves the contradiction by maintaining reliability while keeping the system lightweight and cost-effective.
Solution Approach 2:
Instead of using a single belt drive that reverses direction, the system uses two belt drives rotating in opposite directions. The differential coupling combines these opposite-direction rotations to produce the final output. This inversion approach eliminates the harmful stress of direction reversal on individual belts while maintaining the advantages of belt drive technology.
2Device complexity
If a single belt drive is used for forward and reverse drive, then the system structure is simplified, but stress from continual direction changes leads to high component failure
Solution Approach 1:
The single belt drive is segmented into two separate belt drives, each dedicated to one direction of rotation. This segmentation prevents the harmful effect of continual direction changes on a single belt while maintaining relatively simple system structure through the use of standard belt drive components and a differential coupling.
Solution Approach 2:
The differential coupling serves multiple functions: it combines the outputs of two opposite-direction belt drives, enables both forward and reverse drive operations, and allows for continuous variable transmission ratios. This multi-functionality resolves the contradiction by achieving reliable bidirectional operation without significantly increasing structural complexity.
3Adaptability or versatility
If hydrostatic CVT is used, then continuously variable transmission is achieved, but the system becomes expensive to implement and service
Solution Approach 1:
The hydrostatic mechanical system is replaced with a belt drive system that uses friction and tension rather than fluid pressure. The two belt drives with adjustable input:output ratios provide continuously variable transmission capability using simpler, more cost-effective mechanical components that are easier to manufacture and service.
Solution Approach 2:
The transmission ratio is changed by adjusting the input:output ratios of the belt drives rather than using complex hydrostatic displacement control. This parameter change approach allows continuous variable transmission while using simpler, more cost-effective belt drive mechanics instead of expensive hydrostatic components.
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 system achieves low-cost, lightweight, and easily serviceable continuously variable transmission with reduced component stress and lower service costs by adjusting the input:output ratios of the belt drives to control drive speed and direction.
Implementation Method 1
a differential coupling having an output to be connected to a vehicle driven axle, the differential coupling driven by the outputs of the first belt drive and the second drive to provide an aggregate drive at the output of the differential coupling
Implementation Method 2
a first belt drive having an input and an output, the first belt drive driven in a first direction by the input shaft, the first belt drive having an adjustable input:output ratio
Data Source
AI summary
A transmission system for a vehicle having a belt drive transmission. The belt drive has an adjustable input and output ratio, where the output of the belt drive is provided as a first input to a differential coupling. A further rotating connection is provided as a second input to the differential coupling, so that the output of the differential coupling is arranged as the output of the transmission system. Accordingly, the transmission output is based on the aggregate sum of the rotation of the first and second inputs to the differential coupling, wherein adjustment of the input and output ratio of the belt drive allows for a continuously variable transmission system.