Actuated Hydraulic Mount for Low-Frequency Rigidity and Isolation
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Solution Overview
Problem
Hydraulic mounts face challenges in achieving optimal damping for quasi-static loads and low-frequency vibrations while maintaining effective isolation for high-frequency vibrations, with existing solutions often compromising on dynamic rigidity and increasing installation space.
Innovation Solution
The hydraulic bearing incorporates a pressure chamber, a cylinder channel, and a control piston that is slidably displaceable within the cylinder channel, driven by an actuator, to control pressure and volume changes in the working chamber, eliminating the need for a flexible control membrane and allowing for increased rigidity without expanding the actuator size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a flexible control membrane is used to change working chamber volume, then high-frequency vibration isolation is improved, but dynamic rigidity for low-frequency vibrations deteriorates
Solution Approach 1:
The patent replaces the flexible control membrane with a piezoelectric ceramic element that uses piezoelectric effect to change working chamber volume. This substitution eliminates the compromise between flexibility and rigidity by using an active material that can dynamically adjust its properties - providing rigidity when needed and volume change capability when needed, without the inherent flexibility limitations of a membrane structure.
Solution Approach 2:
The piezoelectric ceramic element changes its physical dimensions (volume) in response to applied electric fields, enabling dynamic adjustment of the working chamber volume. This parameter change approach allows the system to maintain rigid structural boundaries while achieving the volume changes necessary for high-frequency vibration isolation, resolving the contradiction between structural rigidity and volume adaptability.
2Reliability
If the actuator size is increased to improve control capability, then vibration isolation performance is improved, but installation space requirements increase
Solution Approach 1:
The patent replaces a traditional mechanical actuator with a piezoelectric ceramic element that directly couples to the pressure chamber. Piezoelectric elements can achieve precise control with much smaller dimensions compared to conventional mechanical actuators, thereby maintaining vibration isolation performance while significantly reducing the installation space required.
Solution Approach 2:
The system uses a pressure chamber filled with hydraulic fluid that is hydraulically connected to the working chamber. The piezoelectric element controls the pressure chamber, which in turn controls the working chamber volume through hydraulic pressure transmission. This hydraulic coupling mechanism enables effective vibration control with a compact actuator design, as the hydraulic system amplifies the control effect.
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 enhances dynamic rigidity for low-frequency vibrations and improves high-frequency vibration isolation, reducing installation space and maintaining effective damping across frequency ranges.
Implementation Method 1
the control element (42) is designed as a piezoelectric ceramic element which is subjected to a voltage in order to change its volume
Implementation Method 2
a control channel (24) which is assigned to the working chamber (4) and leads into the pressure chamber (46)... the pressure chamber (46) is filled with a hydraulic fluid
Implementation Method 3
The throttle channel represents a flow resistance for the flowing hydraulic fluid. Flowing through the correspondingly designed throttle channel therefore generates dissipation and thus damping work.
Data Source
Figure 1
AI summary
The invention relates to a hydraulic mount (2) having a suspension spring (36), a working chamber (4) that is at least partially surrounded by the suspension spring (36) and filled with a hydraulic fluid, a compensation chamber (6), and a restriction channel (10) for exchanging hydraulic fluid, configured between the working chamber (4) and the compensation chamber (6), the hydraulic mount (2) further comprising: a pressure chamber (46), a cylinder channel (42) extending between the pressure chamber (46) and the working chamber (4), a control plunger (12) that is inserted into the cylinder channel (42) and can be displaced in the cylinder channel (42) by sliding in a corresponding longitudinal cylinder direction Z, and an actuator (16) for the controlled deflection of the control plunger (12) in the longitudinal cylinder direction Z. The invention further relates to a vehicle comprising a hydraulic mount (2) of this type.