Hydraulic Rotary Vibration Reduction Device for Drivetrain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Internal combustion engines with a reciprocating piston design produce uneven drive torque, leading to rotary vibrations that detract from driving comfort due to their inherent rotational irregularities, which existing dual mass flywheel systems struggle to fully mitigate.
Innovation Solution
A rotary vibration reduction device featuring a hydraulic or gas pressure actuator with a piston chamber and pressure-generating device, coupled with a pressure-balancing system, to control working pressure and decouple rotational irregularities, allowing for efficient transmission of mean torque without twisting the primary and secondary connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dual mass flywheel with spring and damper devices is used to reduce rotary vibrations, then driving comfort is improved, but the device complexity increases
Solution Approach 1:
The patent replaces the traditional mechanical spring and damper devices with a hydraulic system consisting of a hydraulic cylinder, piston, and pressure-generating device. This substitution maintains the vibration reduction function while simplifying the overall device structure and enabling more precise control of the coupling between primary and secondary connectors.
Solution Approach 2:
The patent employs a hydraulic system with a cylinder and piston to create a controllable coupling between the primary and secondary connectors. The pressure-generating device adjusts hydraulic pressure to dynamically control the coupling stiffness, providing effective vibration reduction while maintaining structural simplicity and controllability.
2Productivity
If a rigid coupling between primary and secondary connectors is used, then torque transmission efficiency is improved, but rotary vibrations are transmitted directly to the drivetrain
Solution Approach 1:
The patent implements a dynamic coupling system where the stiffness between primary and secondary connectors can be adjusted in real-time based on operating conditions. The pressure-generating device modifies hydraulic pressure to optimize the balance between torque transmission efficiency and vibration isolation, allowing the system to adapt to varying load and speed conditions.
Solution Approach 2:
The patent changes the physical parameter of coupling stiffness by adjusting hydraulic pressure in the cylinder-piston system. This allows the coupling characteristics to be dynamically modified according to operating conditions, achieving high torque transmission efficiency during normal operation while effectively isolating rotary vibrations during transient conditions.
3Object-affected harmful factors
If a soft coupling with spring devices is used to reduce rotary vibrations, then driving comfort is improved, but torque transmission efficiency decreases due to elastic deformation
Solution Approach 1:
The patent uses a hydraulic cylinder-piston system to create a controllable coupling that can operate in different stiffness modes. By adjusting hydraulic pressure, the system can provide soft coupling characteristics for vibration reduction or stiffer coupling for efficient torque transmission, eliminating the need for elastic deformation-based springs.
Solution Approach 2:
The patent replaces elastic spring devices with a hydraulic pressure-based coupling system. This substitution eliminates energy losses associated with elastic deformation while maintaining the ability to reduce rotary vibrations through controlled hydraulic pressure and adjustable coupling stiffness.
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 solution effectively reduces rotary vibrations, enhancing driving comfort by minimizing the transmission of rotational irregularities to the drivetrain, enabling improved torque transmission and reduced energy consumption, and allowing for fault-free starting and smooth operation across varying load conditions.
Implementation Method 1
a rotary vibration reduction device which is configured to transmit a drive power, in the form of a torque and a rotation speed, from a drive machine to a drivetrain... configured as a hydraulic device
Implementation Method 2
A rotary vibration reduction device featuring a hydraulic or gas pressure actuator with a piston chamber and pressure-generating device
Implementation Method 3
since the fluids normally used in such a device are incompressible, preferably includes a device which has a spring stiffness or an elasticity in order to form a vibratable system
Implementation Method 4
a spring and damper device. A rotary vibration provokes a rotational movement of the primary connector relative to the secondary connector, wherein these rotary vibrations are firstly reduced by the vibratable sprung mass system, and also can be damped and hence further reduced by the damper device
Data Source
AI summary
A rotary vibration reduction device for a motor vehicle for transmitting drive power from a drive machine to a drivetrain is provided. The vibration reduction device includes a primary and secondary connectors between the drive machine and drivetrain, and a coupling device between the primary connector and the secondary connector. The coupling device has a vibration reduction actuator with a piston chamber and has a piston element movable to generate a vibration reduction force in response to changes in working pressure in the piston chamber controlled by a pressure-generating device.