Piston Pump Restoring Spring Design for Brake Systems
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Solution Overview
Problem
Conventional piston pumps in vehicle brake systems face challenges in cost, complexity, and pressure resistance due to the use of polished end windings in restoring springs and the distribution of axial and radial forces, which complicates component production and assembly.
Innovation Solution
A piston pump design featuring a restoring spring without polished end windings, an elastic high-pressure sealing element with a radial receiving groove and flexible sealing lip, and components made from wear-resistant materials to absorb and distribute forces efficiently, allowing for simpler production and improved sealing at elevated pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polished end windings are used in the restoring spring, then the spring can be braced on the cylinder wall and cylinder bottom, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the polished end windings from the restoring spring design, eliminating the complex manufacturing process while maintaining spring functionality through alternative bracing arrangements using the cylinder bottom corner radius and wall transition
Solution Approach 2:
Instead of polishing the spring end windings to achieve proper bracing, the patent inverts the approach by designing the cylinder bottom corner radius and wall transition to accommodate the spring wire directly, reversing the solution from modifying the spring to modifying the housing
2Length of moving object
If the cylinder bottom is made thin to reduce component length, then the overall pump size is reduced, but the structural strength decreases
Solution Approach 1:
The patent applies local quality by creating a reinforced corner radius region at the cylinder bottom where the spring wire contacts, providing localized strength enhancement only where needed rather than thickening the entire cylinder bottom
Solution Approach 2:
The patent uses a curved corner radius transition between the cylinder bottom and wall, distributing stress more evenly and preventing stress concentration that would occur with sharp corners, thereby maintaining strength with thinner material
3Strength
If axial and radial forces are distributed to multiple components, then the load on each component is reduced, but the device complexity increases
Solution Approach 1:
The high-pressure sealing element serves multiple functions: it provides sealing against the cylinder wall, absorbs radial force components, and transmits axial forces to the piston assembly, eliminating the need for separate force-absorbing components
Solution Approach 2:
The patent merges the sealing function and force absorption function into a single high-pressure sealing element, combining what would traditionally require multiple separate components into one integrated element
4Duration of action of stationary object
If wear-resistant materials are used for the inlet valve seat, then the valve durability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the material parameter of the inlet valve seat to a wear-resistant material, significantly extending the service life of the valve assembly while the cost increase is offset by the extended component lifecycle and reduced maintenance requirements
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 reduces production costs, enhances pressure resistance, and simplifies assembly while maintaining effective sealing and reduced component stress, enabling a more economical and efficient piston pump for vehicle brake systems.
Implementation Method 1
a restoring spring (30), disposed in the compression chamber (28.1) and embodied as a simple spiral spring, without polished winding ends
Implementation Method 2
a restoring force F2 of a restoring spring 10, disposed in the compression chamber 8.1 and guided by a cylinder wall 8.4, which spring is embodied for instance as a spiral spring with polished end windings
Implementation Method 3
the cage element (31) has an elastic high-pressure sealing element (31.1), which toward one cylinder wall (28.4) has a radial contact region (31.2) for receiving and centering the upper end winding (30.1) of the restoring spring (30)
Implementation Method 4
the second piston element 2.2 with the inlet valve seat 5.1 is pressed sealingly onto the inlet valve sealing element 5.3, via the first piston element 2.1 driven by an eccentric element 14 disposed in an eccentric chamber 15, and the inlet valve 5 is closed
Implementation Method 5
the outlet valve 6 is opened when a pressure in a compression chamber 8A is greater than a spring force, acting on an outlet valve sealing element 6.2 of the outlet valve 6 of an outlet valve spring 6.3, as a result of which the outlet valve sealing element 6.2 is pressed out of an outlet valve seat 6.1
Implementation Method 6
the first piston element 2.1 driven by an eccentric element 14 disposed in an eccentric chamber 15
Implementation Method 7
fluid is aspirated radially via a filter sleeve 9
Data Source
AI summary
A piston pump includes a piston assembly which has at least one transverse bore which corresponds to a longitudinal bore. The piston pump further includes a cylinder in which the piston assembly is guided in a longitudinally movable manner, and an inlet valve which includes a cage element, in which an inlet valve spring and sealing element are arranged, and a corresponding inlet valve seat which is arranged on the piston assembly. The inlet valve sealing element can be pressed sealingly into the corresponding inlet valve seat by means of a restoring spring in order to close off the longitudinal bore. The restoring spring is designed as a simple cylindrical spiral spring which is supported axially with an upper end winding against the cage element and with a lower end winding against a cylinder base. The cage element has an elastic high-pressure sealing element which, in the direction of a cylinder wall, has a radial support region for holding and centering the upper end winding of the restoring spring. In order to guide the restoring spring, the cylinder has, at the transition between the cylinder wall and the cylinder base, a cylinder base corner radius which is adapted to the lower end winding.