Hydraulic Gear Pump CVT for Slip-Free Heavy-Load Transmission
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Solution Overview
Problem
Existing continuously variable transmission systems, such as push belt transmissions, are prone to slipping, especially in heavy load applications, limiting their use to light applications due to inefficiencies in power transmission and limited transmission ratio options.
Innovation Solution
A continuously variable transmission system comprising two gear pumps with interconnected adjustment members that adjust their pump volumes in inverse correlation, utilizing a closed hydraulic circuit to enhance power transmission efficiency and reduce slipping, allowing for effective use in both light and heavy load applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If push belt transmissions are used for their simplicity, then device complexity is reduced, but reliability deteriorates due to slipping in heavy load applications
Solution Approach 1:
The patent replaces the mechanical friction-based push belt transmission with a hydraulic gear pump transmission system. The fluid coupling between gears eliminates slipping by using hydraulic pressure to transmit power, while the gear meshing provides positive engagement for reliable power transmission in heavy load applications.
Solution Approach 2:
The invention introduces a closed hydraulic circuit using gear pumps and fluid coupling to transmit power. The hydraulic system provides slip-free power transmission through fluid pressure, replacing the unreliable friction-based mechanical coupling of push belts while maintaining continuous variable transmission capability.
2Ease of manufacture
If push belt transmissions are used, then ease of manufacture is improved, but adaptability deteriorates due to limited transmission ratio options
Solution Approach 1:
The patent implements continuous variable transmission by making the effective gear ratio dynamically adjustable. The transmission ratio can be continuously varied by changing the engagement position of the gears or adjusting hydraulic pressure, providing unlimited transmission ratio options within the operating range, unlike fixed-ratio gear systems.
Solution Approach 2:
The hydraulic gear pump transmission system serves multiple functions: it provides continuous variable transmission ratio adjustment, eliminates slipping, handles heavy loads, and maintains efficient power transmission across a wide operating range, making it universally applicable to various load conditions.
3Device complexity
If conventional transmissions are used, then device complexity is reduced, but energy efficiency deteriorates due to power loss in heavy load applications
Solution Approach 1:
The patent replaces friction-based mechanical power transmission with hydraulic coupling through gear pumps. This substitution eliminates energy loss from belt slipping and provides more efficient power transmission, especially in heavy load conditions where friction-based systems suffer significant power loss.
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 effectively adjusts transmission ratios and optimizes engine operation by maintaining constant volumetric flow, reducing slipping, and enabling efficient power transmission across a wide range of loads, including heavy applications like trucks.
Implementation Method 1
By using a fluid as the medium to transmit power in a substantially closed hydraulic circuit, slipping can be reduced, prevented or even eliminated
Implementation Method 2
each gear pump further comprises an adjustment member for adjusting the pump volume of the respective gear pump
Data Source
AI summary
The invention relates to a continuously variable transmission and a transmission system comprising said continuously variable transmission, wherein the continuously variable transmission comprises a first gear pump and a second gear pump, wherein each gear pump comprises a first gear and a second gear meshing with the first gear over an overlap distance in an overlap direction parallel to the first gear axis, wherein each gear pump further comprises an adjustment member for adjusting the pump volume, wherein the adjustment member of the first gear pump and the adjustment member of the second gear pump are interconnected by a connecting member for adjusting the pump volume of the first gear pump and the pump volume of the second gear pump in an inverse correlation to each other.