Hydraulic Brake Pump Damper Unit for Pressure Pulsation Reduction
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Solution Overview
Problem
Hydraulic brake systems face challenges in completely reducing pressure pulsation caused by pump operation, leading to noise and increased manufacturing costs due to the need for more pistons and heavier motors.
Innovation Solution
A hydraulic brake system with a damper unit placed between the pump's outlet port and orifice, allowing communication between main flow passages of the first and second hydraulic circuits through a cylinder with a reciprocating piston and springs, which reduces pressure pulsation by achieving equilibrium between the circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the number of pistons of the pump is increased to reduce pressure pulsation, then pressure pulsation is reduced, but weight and volume of the motor increase leading to increased manufacturing costs
Solution Approach 1:
A damper unit is introduced as an intermediary component between the pump outlet and the hydraulic circuit. The damper unit includes a piston and spring mechanism that absorbs and dampens pressure pulsations generated by the pump, eliminating the need to increase the number of pump pistons or motor size while effectively reducing pressure fluctuations
Solution Approach 2:
The damper unit changes the physical parameters of the hydraulic system by introducing a compliant element (spring) and a damping element (piston moving in fluid). This allows the system to absorb pressure variations without requiring changes to the pump's operational parameters or increasing motor capacity
2Stability of the object's composition
If the number of pistons of the pump is increased to reduce pressure pulsation, then pressure pulsation is reduced, but manufacturing costs increase
Solution Approach 1:
The damper unit serves as a cost-effective intermediary device that can be added to existing pump designs without requiring expensive modifications to the pump itself. By using a simple piston-spring mechanism, the system achieves pressure pulsation reduction without the high manufacturing costs associated with increasing pump piston count or motor size
3Stability of the object's composition
If an orifice is provided to control cross-sectional area of flow passage for damping reduction, then pressure pulsation is partially reduced, but complete reduction cannot be achieved
Solution Approach 1:
The damper unit is positioned as an intermediary between the pump outlet and the orifice, providing primary pressure pulsation damping. This complementary arrangement allows the orifice to continue serving its flow control function while the damper handles the pulsation reduction, achieving complete pressure stabilization that neither component could accomplish alone
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
The damper unit effectively reduces pressure pulsation and noise, enhancing driver comfort by transmitting uniform oil pressure and improving system efficiency without increasing weight or volume.
Implementation Method 1
springs disposed at opposite sides of the piston to support the piston
Implementation Method 2
the damper unit allows main flow passages of the first and second hydraulic circuits to communicate with each other therethrough
Data Source
AI summary
Disclosed is a hydraulic brake system capable of reducing periodic pressure pulsation caused by operation of a piston. The hydraulic brake system includes a master cylinder generating braking hydraulic pressure by operation of a brake pedal, a wheel brake provided to each of front right and left wheels and rear right and left wheels of a vehicle to receive the braking hydraulic pressure from the master cylinder to generate braking force, a solenoid valve provided to each of an inlet and an outlet of each of the wheel brakes to control flow of the braking hydraulic pressure, a low pressure accumulator temporarily storing oil, which is ejected from the wheel brakes during operation of the solenoid valves, a pump compressing the oil stored in the low pressure accumulator such that the oil is ejected towards the wheel brakes or the master cylinder as needed, and an orifice disposed near an outlet port of the pump. Further, a damper unit is disposed between the outlet port of the pump and the orifice to reduce pressure pulsation caused by operation of the piston, thereby improving product reliability through noise reduction during brake control.