Piston Pump Groove Constriction for Torque Retention
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Solution Overview
Problem
Hydraulic power vehicle braking systems face challenges in preventing torque support elements from exiting the groove in piston pump assemblies, which can lead to misalignment and inefficiency in generating brake pressure and conveying brake fluid, especially during slip regulation in systems like ABS, TCS, and ESP.
Innovation Solution
The piston pump assembly incorporates a groove with a constriction in the cylinder or piston to secure torque support elements, using a reshaping mechanism to prevent axial exit, ensuring proper engagement and alignment with a helical gear and reduction gear unit, facilitating assembly by allowing groove insertion before constriction formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the groove is open at both ends to allow torque support element insertion, then ease of assembly is improved, but the torque support element may exit the groove and enter adjoining components
Solution Approach 1:
The groove is segmented into two functional zones: an open insertion zone that allows easy insertion of the torque support element, and a closed retention zone at the end that prevents axial exit. This segmentation resolves the contradiction by providing both easy assembly (through the open zone) and reliable retention (through the closed zone with constriction).
Solution Approach 2:
The constriction is formed at one end of the groove before assembly, creating a pre-prepared retention barrier. This preliminary action allows the torque support element to be easily inserted through the open end while being automatically retained by the pre-formed constriction, preventing it from exiting into adjoining components.
2Reliability
If the groove is closed at both ends to prevent torque support element exit, then reliability is improved, but assembly complexity increases due to constriction formation
Solution Approach 1:
Instead of closing the entire groove, only a localized constriction is formed at one end of the groove. This local quality change provides the necessary retention function while maintaining the simplicity of the overall groove structure, avoiding the need for complex closed-end configurations throughout the entire groove length.
Solution Approach 2:
The constriction acts as an intermediary element within the groove that provides the retention function. Rather than making the entire groove complex and closed, the simple constriction feature serves as a mediator that prevents torque support element exit while keeping the groove structure relatively simple and easy to manufacture.
3Ease of manufacture
If the torque support element is inserted before constriction formation, then assembly is simplified, but the torque support element may be damaged or misaligned
Solution Approach 1:
The constriction is formed as a preliminary feature before the torque support element is inserted. This preliminary action ensures that when the element is inserted, the constriction is already in place to guide and retain it, preventing damage and misalignment while maintaining simple assembly procedures.
Solution Approach 2:
The constriction serves as a beforehand protective feature that cushions and guides the torque support element during insertion. By having the constriction in place before insertion, the element is protected from damage and ensured proper alignment, while the assembly process remains simple and straightforward.
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 effectively prevents torque support element exit, ensuring stable operation and efficient brake pressure generation and fluid conveyance in hydraulic power and slip-controlled vehicle braking systems, enhancing system reliability and performance during service braking and slip regulation.
Implementation Method 1
a helical gear, for example a spindle drive, which converts a rotary driving motion of the electric motor into a translatory motion
Implementation Method 2
a constriction, so that the torque support element is not able to axially exit. For example, the groove is closed by a reshaping of the material surrounding that end
Data Source
AI summary
A piston pump assembly for a hydraulic power vehicle braking system including an electric motor, a planetary gear set, a helical gear, and a piston which is displaceable in a cylinder. To prevent the piston from rotating in the cylinder, cylinder pins are situated in grooves at an inner side of the cylinder and engage with the recesses in a flange of the piston. Due to reshaping, the grooves are closed at one end, so that the cylinder pins are axially secured.