Multipiston Pump Phase-Offset Cam Design for Brake Pulsation
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Solution Overview
Problem
Existing multipiston pumps for vehicle brake systems face issues with pressure pulsation, complex manufacturing processes, and structural volume due to the geometric arrangement of piston pumps and hydraulic connections, leading to increased costs, tool wear, and potential leaks.
Innovation Solution
The multipiston pump design allows for independent selection of piston pump locations and placement of hydraulic connections within the same sectional planes, enabling a more direct hydraulic connection, reducing manufacturing complexity, and allowing for flexible geometric arrangement of piston pumps, which shortens hydraulic connecting bore lengths and simplifies machining and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If connecting conduits are embodied in multiple housing planes spaced apart from the piston pumps, then installation space is reduced, but the structural volume of the pump housing increases and manufacturing complexity increases
Solution Approach 1:
The patent transitions from a multi-plane spatial arrangement to a single-plane arrangement by repositioning connecting conduits to the same housing plane as the piston pumps. This dimensional simplification reduces the structural volume requirement while maintaining installation space efficiency.
Solution Approach 2:
The patent merges the location of connecting conduits with the piston pump housing plane, consolidating hydraulic connections into the same spatial plane rather than distributing them across multiple planes. This merging reduces the overall structural volume while maintaining functional connectivity.
2Area of stationary object
If connecting conduits are embodied in multiple housing planes, then installation space is reduced, but the number of individual partial bores increases leading to higher machining effort and cost
Solution Approach 1:
By relocating all connecting conduits to a single housing plane, the patent reduces the number of directional changes and partial bores required during machining. This single-plane approach simplifies the manufacturing process and reduces machining effort and cost.
3Device complexity
If piston pumps are arranged in a 6×60° configuration, then the pump structure is simplified, but pressure pulsation increases affecting brake pedal performance
Solution Approach 1:
The patent applies different angular spacing configurations to different piston pump groups within the same pump unit. By using 120° spacing for some pistons and 60° for others, it creates local variations in the hydraulic flow pattern that reduce overall pressure pulsation while maintaining structural simplicity.
4Adaptability or versatility
If connecting bores are made relatively long and diverted multiple times, then the pump housing can accommodate more components, but pressure buildup time increases and gas bubbles accumulate
Solution Approach 1:
The patent repositions connecting conduits in the same housing plane as piston pumps, creating shorter and more direct hydraulic pathways. This eliminates the need for multiple diversions and reduces the length of connecting bores, thereby reducing pressure buildup time and preventing gas bubble accumulation.
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 design enhances manufacturing efficiency, reduces structural volume, and improves brake system pressure buildup times, while maintaining pulsation performance, leading to cost savings and increased durability of components.
Implementation Method 1
a pump drive comprising a rotatably supported shaft and a single cam located on the shaft in a manner fixed against relative rotation. This cam drives an arrangement of a total of six piston pumps
Implementation Method 2
Both pump units are in operative communication with one another on the intake side, but serve as pressure generators for two separate brake circuits of a vehicle brake system
Data Source
AI summary
A multipiston pump including a plurality of piston pumps hydraulically combined into at least two pump units are coupled on the intake side, but supply two separate hydraulic circuits of a vehicle brake system with pressure fluid. To reduce brake pedal pulsation the piston pumps are driven in phase-offset fashion.An eccentric unit comprising two spaced-apart cams rotated counter to one another, with the individual piston pumps being located in a number of sectional planes through the pump housing corresponding to the number of cams and locate the connecting conduits for hydraulically coupling the pump units are located in a region of the pump housing defined by the sectional planes.