Continuously Variable Transmission Input End Bucket Wheel Torque
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Solution Overview
Problem
Existing continuously variable transmissions face challenges in achieving rapid increases in output torque during activation or acceleration, as the revolution speed of the cavity planetary gear carrier is reduced proportionally, limiting power density and suitability for high-torque conditions.
Innovation Solution
A continuously variable transmission design with an input end and output end planetary gear set, where a cavity planetary gear carrier is positioned between them, and a bucket wheel planetary gear set is integrated on the side close to the cavity input end cover, allowing independent rotation speed control and enabling flexible, high-torque transmission without external resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bucket wheel planetary gear set is positioned on the side close to the cavity output end cover, then the structure is simplified, but the rotation speed of the bucket wheel is reduced proportionally while the output torque increases, causing slow power density increase that is unsuitable for rapid torque requirements
Solution Approach 1:
The transmission system is segmented into two independent planetary gear sets: an input end planetary gear set and an output end planetary gear set. The bucket wheel planetary gear set is positioned at the input end rather than the output end, creating functional separation that allows independent optimization of speed and torque characteristics for each gear set.
Solution Approach 2:
The patent changes the spatial dimension of the bucket wheel planetary gear set positioning from the output end to the input end of the cavity planetary gear carrier. This dimensional repositioning fundamentally alters the speed-torque relationship, enabling the bucket wheel to rotate at higher speeds while the output end planetary gear set provides torque multiplication.
2Device complexity
If the bucket wheel planetary gear set is positioned on the side close to the cavity output end cover, then the structure is simplified, but the power density increase becomes slow and cannot meet rapid torque increase requirements during activation or acceleration
Solution Approach 1:
The transmission system is segmented into two independent planetary gear sets: an input end planetary gear set and an output end planetary gear set. The bucket wheel planetary gear set is positioned at the input end rather than the output end, creating functional separation that allows independent optimization of speed and torque characteristics for each gear set.
Solution Approach 2:
The patent changes the operational parameters by repositioning the bucket wheel planetary gear set at the input end, which fundamentally alters the speed and power density characteristics. This parameter change enables rapid power density increase during activation or acceleration while maintaining structural simplicity.
3Reliability
If a control system is added to the hydraulic torque converter to overcome synchronization problems, then the transmission capacity loss is prevented, but the system complexity and manufacturing cost increase
Solution Approach 1:
The hydraulic torque converter is designed to achieve synchronization automatically through its own operational characteristics without requiring external control systems. The fluid coupling and torque transmission mechanisms inherently maintain synchronization between the pump wheel and turbine, eliminating the need for additional control apparatus.
Solution Approach 2:
The patent removes the control system from the hydraulic torque converter by designing it to self-regulate synchronization. This extraction of the control system simplifies the overall structure while maintaining reliable synchronization capability through the inherent properties of the hydraulic transmission mechanism.
4Ease of operation
If a hydraulic torque converter is used for power transmission, then the transmission is smooth, but the transmission capacity is lost when pump wheel and turbine speeds are close to synchronization
Solution Approach 1:
The patent merges the hydraulic torque converter with a planetary gear transmission system. The hydraulic converter provides smooth power transmission and torque multiplication, while the planetary gear set maintains transmission capacity during synchronization by providing mechanical gear engagement that prevents slip and maintains drive capability.
Solution Approach 2:
The transmission system uses a composite approach combining hydraulic transmission and mechanical gear transmission. The hydraulic torque converter handles smooth power flow and initial torque multiplication, while the planetary gear set provides rigid mechanical transmission capacity when speeds approach synchronization, creating a hybrid system that leverages the strengths of both transmission types.
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 enables zero-speed activation, rapid torque multiplication, wide torque range adjustment, and self-adaptive matching of torque and speed, suitable for high-power flexible transmission without the need for complex control systems.
Implementation Method 1
an input end planetary gear set and an output end planetary gear set, a cavity planetary gear carrier is disposed between the input end planetary gear set and the output end planetary gear set
Implementation Method 2
an input end planetary gear set and an output end planetary gear set, a cavity planetary gear carrier is disposed between the input end planetary gear set and the output end planetary gear set
Data Source
AI summary
Provided is a continuously variable transmission capable of solving a technical problem in which upon activation of a continuously variable transmission, speed increase in vaned-wheel power density is low and unable to meet the requirement for rapidly increasing output torque. The present continuously variable transmission comprises a planetary gear set (101) at an input end and a planetary gear set (102) at an output end. A planetary carrier (104) having a cavity is provided between the planetary gear set (101) at the input end and the planetary gear set (102) at the output end. The planetary carrier (104) comprises an input end cover (6) and an output end cover (13). A vaned-wheel housing (14) having a cavity is fixed between the input end cover (6) and the output end cover (13). An inner side of the planetary gear set (101) at the input end is connected to the input end cover (6). An inner side of the planetary gear set (102) at the output end is connected to the output end cover (13). A vaned-wheel-based planetary gear set (103) is provided at one internal side of the vaned-wheel housing (14).