Pump Unit Noise Reduction via Extraction and Damping
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Solution Overview
Problem
Existing pump units for pneumatic brake force boosters face challenges in noise reduction, production and assembly optimization, reliability, and water ingress protection, particularly in automotive applications where space and durability are critical.
Innovation Solution
The solution involves reducing contact areas between the working chamber cover and pump housing using molded protuberances for three-point support, incorporating elastic decoupling elements, and employing check valves with elastic tabs for water protection, along with streamlined designs and damping elements to minimize noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If sound deadening measures are incorporated into the pump unit interior, then noise emissions are reduced, but device complexity and production costs increase
Solution Approach 1:
The patent extracts the sound deadening function from the pump housing interior and relocates it to the base holder through which the drive shaft passes. This is achieved by providing a damping element in the base holder that attenuates vibrations and noise generated by the drive unit, thereby reducing noise emissions without complicating the pump unit's internal construction.
2Volume of moving object
If the pump unit is positioned at an installation location accessible for water ingress, then space requirements are met, but reliability decreases due to corrosion and wear risks
Solution Approach 1:
The patent introduces an intermediate sealing structure at the air outlet unit where the drive shaft penetrates the pump housing. A seal element is provided in the base holder that prevents water ingress along the drive shaft, acting as a mediator between the external environment and the internal pump components, thereby protecting against corrosion and wear while maintaining installation flexibility.
3Reliability
If diaphragm-type pump units with complex construction are used, then pumping function is achieved, but manufacturing and assembly costs increase
Solution Approach 1:
The patent extracts the diaphragm component from the traditional pump unit construction and relocates it to the base holder. The diaphragm is arranged in the base holder and acts as a piston bottom, simplifying the overall pump construction by eliminating the need for complex diaphragm-type pump bodies while maintaining the pumping function through the interaction of the drive shaft and diaphragm.
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 approach results in a quieter, more reliable, and cost-effective pump unit with reduced assembly complexity, improved durability, and enhanced protection against water ingress, addressing the limitations of existing technologies.
Implementation Method 1
two elastic decoupling elements, in each case in the form of a damping element, being provided between the drive unit and the pump housing for reducing a transmission of vibrations
Implementation Method 2
at least three molded protuberances distributed over the circumference of a housing flange... spatially stable support, preferably three-point support, can be realized
Data Source
AI summary
The invention relates to a pump unit that can be driven by an electric motor, in particular for providing vacuum for a pneumatic brake booster, including a pump housing that can be closed by a working-chamber cover and at least one elastic displacement element, wherein a working chamber is bounded between the displacement element and the working-chamber cover and wherein inlet valves and outlet valves and inlet channels and outlet channels associated with the valves are associated with the working chamber. According to the invention, in order to reduce noise emissions, devices for reducing a contact surface between the working-chamber cover and the pump housing are provided.