Hydraulic Gear Pump Acoustic Decoupling via Split Support
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Solution Overview
Problem
Existing hydraulic pumps with external gear and acoustic insulation means are bulky and costly, making them unsuitable for space-constrained applications like the automobile industry, as they require heavy elastomer casings to dampen vibrations.
Innovation Solution
The hydraulic pump design features a pump support made in two parts with an acoustically insulating decoupling element, such as an elastomer sheet or O-rings, to prevent direct contact and vibration transmission between the pump body and manifold, allowing for effective acoustic insulation without increasing bulk or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a heavy elastomer casing is used to surround the pump for acoustic insulation, then vibration damping is improved, but the pump becomes bulky and manufacturing cost increases
Solution Approach 1:
The pump support is divided into two separate parts: a front support body and a rear support body (manifold). This segmentation allows the introduction of an acoustically insulating decoupling element between the two parts, enabling vibration damping without requiring a bulky surrounding casing. The segmentation isolates the acoustic insulation function to a specific interface rather than requiring envelopment of the entire pump.
Solution Approach 2:
An acoustically insulating decoupling element is introduced as an intermediary between the front support body and the rear support body (manifold). This decoupling element, which can be an elastomer sheet or O-rings, prevents direct contact and vibration transmission between the pump body and manifold. The intermediary provides effective acoustic insulation at the vibration transmission path without adding overall pump volume.
2Object-affected harmful factors
If a heavy elastomer casing is used to surround the pump for acoustic insulation, then vibration damping is improved, but manufacturing cost increases
Solution Approach 1:
The pump support is divided into two separate parts: a front support body and a rear support body (manifold). This segmentation allows the introduction of an acoustically insulating decoupling element between the two parts, enabling vibration damping without requiring a bulky surrounding casing. The segmentation isolates the acoustic insulation function to a specific interface rather than requiring envelopment of the entire pump.
Solution Approach 2:
The decoupling element uses simple, inexpensive elastomer components (O-rings or thin elastomer sheets) rather than expensive heavy elastomer casings. These simple elastomer elements provide effective acoustic insulation at a fraction of the cost of traditional heavy casings, making the solution economically viable for mass production in the automobile industry.
3Volume of moving object
If acoustic insulation means are integrated into the pump structure, then space is reduced, but effective acoustic decoupling across wide frequency range is difficult to achieve
Solution Approach 1:
An acoustically insulating decoupling element is introduced as an intermediary between the front support body and the rear support body (manifold). This decoupling element, which can be an elastomer sheet or O-rings, prevents direct contact and vibration transmission between the pump body and manifold. The intermediary provides effective acoustic insulation at the vibration transmission path without adding overall pump volume.
Solution Approach 2:
The decoupling element utilizes the viscoelastic properties of elastomer materials, which can effectively dampen vibrations across a wide frequency range. By selecting appropriate elastomer compounds and geometries (O-rings or sheets), the system achieves broad-spectrum acoustic decoupling within the compact integrated structure, maintaining effectiveness across different operating conditions and frequencies.
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 provides effective acoustic decoupling across a wide frequency range without adding bulk or increasing manufacturing costs, ensuring the pump remains compact and efficient.
Implementation Method 1
an acoustically insulating decoupling element in the form of an elastomer sheet or of O-rings made of an elastomer
Implementation Method 2
prevent direct contact and vibration transmission between the pump body and manifold
Data Source
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AI summary
The invention relates to an external gear hydraulic pump. The pump is of the type comprising a pump body (1) housing mutually meshing rotary gears (3) and, on either side of the body, a cover (3) and a support (4) forming a high-pressure fluid outlet manifold, as well as acoustic insulation means for damping vibrations produced by the gears. The pump is characterized in that the acoustic insulation means comprise acoustic decoupling elements (42, 33, 50) of the pump body (1) from its support (4). The invention is applicable to motor vehicles.