Two-part piston pump for brake systems
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Solution Overview
Problem
Existing piston pumps for vehicle brake systems are expensive to produce and have high flow resistance due to the need for complex bore structures, which complicates the manufacturing process and reduces suction performance.
Innovation Solution
The piston pump is designed with a two-part piston, where a cylindrical first part and a piston base element second part eliminate the need for intricate bores, allowing for a simpler and more economical production with reduced flow resistance through an aspiration path between the parts and strategically placed inlet openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex bore structures are made in the piston to enable fluid delivery, then the piston can perform its pumping function, but the manufacturing cost increases and flow resistance increases
Solution Approach 1:
The piston is divided into two separate parts: a first piston part (cylinder) and a second piston part (piston base element). This segmentation eliminates the need for complex internal bores in the piston, as the aspiration path is formed between the two parts. The first piston part can be simply machined on its outer circumference, while the second piston part contains the necessary inlet and connection openings, significantly simplifying manufacturing.
Solution Approach 2:
Instead of creating complex three-dimensional bore structures within the piston, the invention uses the space between the two piston parts to form the aspiration path. This dimensional approach converts an internal complex structure problem into an external spatial arrangement, simplifying both manufacturing and fluid flow.
2Reliability
If complex bore structures are made in the piston to enable fluid delivery, then the piston can perform its pumping function, but the flow resistance increases
Solution Approach 1:
By segmenting the piston into two parts with the aspiration path formed between them, the fluid flow path is simplified and shortened. The inlet opening in the second piston part is positioned laterally close to the base, creating a direct aspiration path that minimizes flow resistance compared to deflection through transverse bores.
Solution Approach 2:
Instead of forcing fluid through complex internal bores from one side of the piston to the other, the invention inverts the approach by allowing fluid to be aspirated directly through inlet openings in the second piston part and delivered through connection openings, reversing the traditional flow path concept.
3Power
If stepped pistons are used to achieve pressure buildup, then the pumping function is enhanced, but the manufacturing complexity and cost increase due to plunge grinding
Solution Approach 1:
The stepped piston structure is achieved by segmenting the piston into two parts with different diameters. The first piston part has a smaller diameter while the second piston part has a larger diameter, creating the necessary step without requiring plunge grinding. This segmented approach allows standard machining processes to be used instead of complex specialized grinding.
Solution Approach 2:
The invention changes the manufacturing parameters from requiring plunge grinding (a complex, expensive process) to standard machining and assembly processes. By accepting the piston as a assembled two-part structure rather than a monolithic stepped component, the manufacturing parameters are simplified while maintaining the functional stepped geometry.
Data Source
AI summary
The invention relates to a piston pump for conveying a fluid, in particular in a vehicle brake system. The piston pump has a cylinder and a piston movably disposed in the cylinder. A restoring element preloads the piston, and a drive unit for actuates the piston in the cylinder to pump the fluid into a pressure chamber formed in the cylinder. The piston is embodied by a first piston par and a second piston part. The first piston part is a cylindrical body, which can be moved by the drive unit. The second piston part form the piston base, in which four radial inlet openings and one axial connection opening for communication with the pressure chamber are disposed. A flange for the disposition of a seal is disposed on the outer circumference of the piston base element. The openings are simple to make in the face ends and circumferential regions of the second piston part.