Hydraulic Unit Pump Pressure Side Damping
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Solution Overview
Problem
Existing hydraulic units in controllable-slip vehicle brake systems face challenges in reducing pressure pulsations caused by piston pumps, leading to operating noise and compromised pressure buildup dynamics, especially in emergency braking scenarios where quick pressure medium volume supply is critical.
Innovation Solution
A second fluid duct is introduced to the pump receptacle, separate from the first fluid duct that intersects the pump, and both ducts are sealed off from each other using existing components, allowing for efficient damping of pressure pulsations without affecting the overall size or functional characteristics of the hydraulic unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a damping device with a restriction element is connected to the first fluid duct to damp pressure pulsations, then pressure pulsations are reduced, but the pressure buildup dynamics are impaired due to flow resistance
Solution Approach 1:
The hydraulic system is segmented into two separate fluid ducts: the first fluid duct maintains unrestricted flow for rapid pressure buildup, while the second fluid duct connects the damping device to enable pressure pulsation reduction. This segmentation allows both functions to operate independently without compromising each other's performance.
Solution Approach 2:
A separation point is introduced as an intermediary element between the two fluid ducts, enabling them to be sealed off from each other while both connecting to the pump receptacle. This intermediary structure allows the damping device to be integrated without interfering with the primary pressure buildup pathway.
2Area of stationary object
If the hydraulic unit is made compact to save installation space, then installation space is reduced, but the integration of damping devices becomes more difficult
Solution Approach 1:
The damping device is integrated into the existing hydraulic unit structure by utilizing the pump receptacle and housing block. The second fluid duct is routed through the housing block to connect the damping device, allowing compact integration without requiring additional external components or increasing the overall footprint of the hydraulic unit.
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 effectively reduces pressure pulsations and improves operating noise without impairing pressure buildup dynamics, ensuring reliable performance even in high-pressure situations like emergency braking.
Implementation Method 1
damping devices are provided on the pump pressure side, said devices generally having at least one pressure medium accumulator with an accumulator capacity (C element) that can vary in accordance with the pressure
Implementation Method 2
spring-operated piston accumulators as pressure medium accumulators
Data Source
AI summary
A hydraulic unit, in particular for a controllable-slip vehicle brake system, includes a housing block, a pump, a first fluid duct, and a second fluid duct. The housing block defines a pump receptacle that receives the pump, which has a suction side and a pressure side. The first duct crosses the pump receptacle in a region of the pressure side of the pump. The second duct leads into the pump receptacle in the region of the pressure side. The first and second ducts are sealed off from each over via a separation point. The hydraulic unit is configured to enable contact with a damping device configured to damp pulsations and reduce operating noise of the hydraulic unit without negatively impacting functional properties of the hydraulic unit, in particular on pressure build-up dynamics of the vehicle brake system, or without jeopardizing a compact construction of the hydraulic unit.