Two-Part Piston Pump Valve Tolerance Compensation
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Solution Overview
Problem
Existing piston pump valves for hydraulic vehicle brake systems face challenges in manufacturing and assembly, particularly in achieving good opening and closing behavior while compensating for manufacturing dimensional tolerances and ensuring long-term tightness.
Innovation Solution
A two-part closing body design with a damping piston and a mushroom-shaped closing element, featuring radial play and a central depression for improved sealing and damping, allows for easy assembly and automated manufacturing, with a channel for fluid flow and a throttle for controlled damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-piece closing element is used, then the structure is simple, but it is difficult to compensate for manufacturing tolerances and ensure long-term tightness
Solution Approach 1:
The closing element is divided into two separate parts: a damping piston and a closing element proper. This segmentation allows each part to be manufactured independently with appropriate tolerances, and their combination provides both tolerance compensation and sustained tightness throughout the valve's service life.
2Manufacturing precision
If the closing element is made complex to compensate for tolerances, then tightness is improved, but manufacturing and assembly costs increase
Solution Approach 1:
By segmenting the closing element into standardizable components (damping piston and closing element), each part can be manufactured using conventional processes and assembled together. This approach achieves tolerance compensation without requiring complex single-piece manufacturing.
3Ease of operation
If radial clearance is provided between the shaft and damping piston, then the closing element can self-align and contact the valve seat fully, but assembly precision requirements increase
Solution Approach 1:
The closing element is designed with radial clearance allowing it to move dynamically and self-align during operation. The shaft can shift radially within the damping piston to ensure full contact with the valve seat, compensating for minor misalignments automatically.
4Ease of manufacture
If a two-part closing element is used, then assembly is facilitated and tolerance compensation is improved, but the number of components increases
Solution Approach 1:
The closing element is divided into two functional parts that can be assembled in a convenient sequence using automated equipment. While the component count increases, the segmentation enables standardized manufacturing and simplified assembly processes.
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 the assembly process, ensures tightness over the service life, and improves the valve's opening and closing behavior, reducing manufacturing costs and vibration while maintaining effective operation.
Implementation Method 1
The radial clearance thus provided allows the closing element to move slightly radially within the damping piston and, in particular, to slide with its head along the end face of the damping piston.
Implementation Method 2
The central recess forms a concave area on the face of the closing element, which faces the fluid flowing towards the valve. This concave area creates a stagnation effect for the flowing fluid and results in particularly good opening behavior of the valve.
Implementation Method 3
Fluid that has passed through the valve seat opening can reach the damping piston via the channel, passing to the rear of the head and also to the rear of the damping piston. This fluid can be used for precisely controlled damping of the damping piston's movement.
Implementation Method 4
A constriction is formed in the channel, creating a throttle. The throttle restricts or dams the flow of fluid into the interior of the damping piston and towards its rear.
Implementation Method 5
The outlet valve 20 further comprises a one-piece, dome-shaped closing element 22, which is pressed against the sealing seat 18 by means of a coil spring 24.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
In a valve (20) of a piston pump, in particular for a hydraulic vehicle brake system, with a closing body (28) which can be moved in an axially guided manner against a sealing seat (18), according to the invention the closing body (28) is formed in two pieces with a damping piston (30) and a closing element (32) which is inserted in the latter.