Hydraulic Unit Pump Elements with Matched Deliveries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle brake systems experience noise and vibration issues due to the transmission of pressure pulses through rigid connections between hydraulic units and brake master cylinders, leading to unwanted phenomena in the vehicle interior.
Innovation Solution
The hydraulic unit is designed with pump elements assigned to brake circuits of varying volumes, allowing for matched deliveries and reduced motor speed, which decreases vibrations and noise, enabling the use of smaller and lighter motors, and eliminating the need for additional damping elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump elements with the same delivery are used for both brake circuits, then the system can use a standardized design, but the motor speed must be increased to meet the higher demand of the larger brake circuit, resulting in increased vibrations and noise
Solution Approach 1:
The patent applies local quality by assigning different deliveries to pump elements based on their specific brake circuit requirements. The first pump element has a first delivery matched to the first brake circuit volume, while the second pump element has a second delivery matched to the second brake circuit volume. This localized optimization allows each pump element to operate efficiently at lower speeds without compromising overall braking performance.
2Productivity
If the motor speed is increased to meet the demand of the larger brake circuit, then sufficient brake fluid delivery is achieved, but vibrations and noise are amplified and transmitted to the vehicle interior
Solution Approach 1:
The patent changes the delivery parameter of pump elements to match brake circuit volumes. By adjusting the delivery parameter rather than increasing motor speed, the system achieves sufficient brake fluid delivery while operating at lower speeds that generate less vibration and noise.
3Object-generated harmful factors
If additional damping elements are added to reduce vibrations and noise, then the harmful effects are mitigated, but the device complexity and cost increase
Solution Approach 1:
The patent converts the potential harm of pressure pulses into a benefit by matching pump deliveries to brake circuit volumes. This allows the system to operate at lower speeds where pressure pulses are naturally reduced, transforming what could be a harmful vibration issue into a benefit of reduced NVH without requiring additional damping components.
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 reduces vibrations and noise, allows for a more efficient and cost-effective design with lower energy consumption, and enhances the reliability of braking performance by matching pump deliveries to specific brake circuit demands.
Implementation Method 1
The eccentric drive is achieved by means of a drive shaft driven by a pump motor
Data Source
AI summary
In a hydraulic unit of a vehicle brake system having a first pump element, which is assigned to a first brake circuit, and a second pump element, which is assigned to a second brake circuit, the second pump element has a different delivery from the first pump element.