Vehicle Wheel Vibration Damper Throttle Valve
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Solution Overview
Problem
Existing vehicle wheel vibration dampers struggle to effectively dampen relatively high frequency vibrations, leading to hardening of the rubber-elastic body in the damper mount, which worsens high-frequency vibration decoupling and introduces tensioning issues during roll stabilization, limiting the transmission of high-frequency vibrations into the vehicle body.
Innovation Solution
Incorporating a throttle valve in the fluid-conducting connection between the hydraulic pressure chamber and the damper cylinder, allowing for variable damping of high-frequency vibrations by adjusting the throttle effect based on peripheral conditions, thereby relieving the rubber-elastic body of loading and preventing hardening, and using a hydraulic pressure chamber to support the vibration damper on the vehicle body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubber-elastic body in the damper mount is used to support the vibration damper on the vehicle body, then the vibration damper is securely mounted and can dampen low-frequency vibrations, but the rubber-elastic body hardens under high-frequency vibration loads, worsening high-frequency vibration decoupling and introducing tensioning issues
Solution Approach 1:
A hydraulic pressure chamber is introduced as an intermediary between the vibration damper and the vehicle body. This hydraulic mount serves as a mediator that transfers loads while maintaining the rubber-elastic body in a tension-free state, preventing its hardening under high-frequency vibrations. The hydraulic fluid transmits pressure forces while allowing the rubber component to remain soft and effective for high-frequency decoupling.
Solution Approach 2:
The invention replaces the direct mechanical support structure with a hydraulic support system. The hydraulic pressure chamber filled with fluid provides the mounting function, utilizing hydraulic pressure to support the vibration damper on the vehicle body. This hydraulic support mechanism handles high-frequency vibration loads without causing the rubber-elastic body to harden, as the hydraulic fluid naturally accommodates high-frequency pressure variations.
2Stability of the object's composition
If the rubber-elastic body is used to decouple high-frequency vibrations, then mounting stability is achieved, but the body becomes tensioned during roll stabilization, limiting effective high-frequency vibration transmission damping
Solution Approach 1:
The hydraulic pressure chamber acts as an intermediary that separates the roll stabilization function from the high-frequency vibration damping function. During roll stabilization, the hydraulic system handles the tensioning loads, allowing the rubber-elastic body to remain untensioned and maintain its high-frequency damping capability. The hydraulic mount mediates between these two opposing requirements.
Solution Approach 2:
The mounting system is segmented into two functional components: the hydraulic pressure chamber handles roll stabilization and high-frequency vibration loads, while the rubber-elastic body is dedicated solely to high-frequency vibration decoupling. This functional segmentation allows each component to optimize its performance without compromising the other.
3Device complexity
If hydraulic fluid is conveyed from the damper cylinder into the pressure chamber of the hydraulic mount during wheel deflection, then the volume of expelled hydraulic fluid is absorbed and a gas pressure accumulator can be dispensed with, but the rubber-elastic body hardens and high-frequency vibration decoupling worsens
Solution Approach 1:
The hydraulic pressure chamber serves as an intermediary volume that absorbs hydraulic fluid during wheel deflection, eliminating the need for a separate gas pressure accumulator. However, the chamber is designed with a throttle valve that mediates the fluid flow, allowing it to perform the accumulator function while preventing the rubber-elastic body from hardening under high-frequency vibrations.
Solution Approach 2:
The system dynamically adjusts fluid flow between the damper cylinder and hydraulic pressure chamber through a throttle valve. The throttle valve allows rapid fluid displacement during wheel deflection (accommodating the accumulator function) while restricting high-frequency vibration-induced fluid movements, thereby preventing rubber body hardening and maintaining high-frequency decoupling effectiveness.
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 solution enables frequency-selective damping of high-frequency vibrations, preventing the rubber-elastic body from hardening and maintaining effective decoupling of high-frequency vibrations from the vehicle body, while allowing for improved roll stabilization without tensioning the elastic body, thus enhancing the overall damping performance.
Implementation Method 1
A throttle valve whose throttle effect can be varied as a function of peripheral conditions is arranged in the fluid-conducting connection between the hydraulic pressure chamber of the damper mount and the chamber in the damper cylinder which is reduced in the case of deflection of the wheel
Implementation Method 2
a rubber-elastic body which is embodied in the manner of a hollow cylinder and in whose center the piston rod is located
Implementation Method 3
dampen not only the low-frequency vibrations of the vehicle wheels within the scope of their visible deflection and rebound movements, but also relatively high frequency vibrations
Implementation Method 4
a hydraulic pressure chamber is formed which is connected via a fluid-conducting connection having a throttle valve to a first damper chamber
Data Source
AI summary
A vibration damper of a vehicle wheel is supported on a vehicle body by a damper mount having an elastic body. The vibration damper includes a fluid-filled cylinder, a piston guided in the cylinder, and a piston rod. A wherein a damper chamber is formed in the cylinder on each side of the piston. The damper mount includes a hydraulic pressure chamber connected via a fluid-conducting connection to the damper chambers, whose volumes are respectively reduced when the vehicle wheel is deflected in relation to the vehicle body. In addition, a throttle valve is provided in the fluid-conducting connection, wherein the throttle value comprises a valve body that is displaceable in relation to a valve seat counter to a spring force, and a throttle bore.