V-belt CVT Motor Extraction for Cooling and Maintenance
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Solution Overview
Problem
Conventional V-belt continuously variable transmissions (CVTs) face challenges in controlling speed change ratios flexibly due to the placement of electric motors within a power unit case, leading to heat-related issues and increased complexity, which complicates cooling and maintenance.
Innovation Solution
The electric motor driving the groove width adjustment mechanism is positioned outside the case, allowing airflow to cool it and reducing heat exposure, with the motor located opposite to the power source to minimize heat impact, and integrated into a compact design with a case cover for protection and easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electric motor is disposed inside the case for the power unit, then the structure is more compact, but the electric motor is exposed to heat from the power source and cannot be easily maintained
Solution Approach 1:
The electric motor is extracted from the case for the power unit and disposed outside the case. This separation removes the electric motor from the harmful thermal environment created by the power source inside the case, while still maintaining a compact overall structure through strategic external placement.
2Volume of moving object
If the electric motor is disposed inside the case for the power unit, then the structure is more compact, but the electric motor cannot be easily maintained or inspected
Solution Approach 1:
The electric motor is extracted from the enclosed case space and positioned externally, making it readily accessible for maintenance and inspection operations without requiring disassembly of the case structure.
3Device complexity
If the electric motor is disposed inside the case for the power unit, then the structure is simpler, but the heat resistance requirements increase and cooling complexity increases
Solution Approach 1:
The electric motor is extracted from the heat-generating environment inside the case, eliminating the need for specialized heat-resistant components or complex active cooling systems. The motor operates in a thermally favorable external environment.
4Device complexity
If the centrifugal governor is used as the groove width adjustment mechanism, then the structure is simpler, but the speed change ratio cannot be controlled flexibly according to operating state
Solution Approach 1:
The centrifugal governor mechanism is replaced with an electric motor that can be controlled by a control unit. This substitution enables flexible, programmable control of the groove width adjustment based on various operating parameters such as vehicle speed, acceleration, and load conditions, rather than relying solely on mechanical centrifugal force.
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 enables active cooling of the electric motor, reduces heat-related stress, simplifies the structure, and improves maintainability, while allowing for more precise control of speed change ratios based on operating conditions.
Implementation Method 1
the case is formed with an opening for sucking and exhausting air into and out of the case, and the electric motor is disposed in a flow path of the air outside the case
Data Source
AI summary
To place an electric motor, which composes a groove width adjustment mechanism, away from a heat source so that the electric motor can be cooled actively, and to improve both the protection and the maintainability of the electric motor.A primary sheave 113 and a secondary sheave 123 each forming a V-groove with a variable width for receiving a belt are provided. A case 105 for housing the primary sheave 113 and the secondary sheave 123 is formed with an opening 110 for sucking and exhausting air into and out of the case 105. An electric motor 140 for driving a groove width adjustment mechanism 141 for the V-groove of the primary sheave 113 is disposed in an airflow path outside the case 105.