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Piston pump with improved pressure build-up dynamicsRelated Patent Categories: Pumps, Expansible Chamber Type, Having Pumping Chamber Pressure Responsive DistributorPiston pump with improved pressure build-up dynamics description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080025857, Piston pump with improved pressure build-up dynamics. Brief Patent Description - Full Patent Description - Patent Application Claims
PRIOR ART [0001] The present invention relates to a piston pump for delivering hydraulic fluid with improved pressure build-up dynamics. [0002] A wide variety of piston pump designs are known from the prior art. Piston pumps for vehicle brake systems are frequently embodied in the form of radial piston pumps, in which at least one piston can be set into a reciprocating motion by means of a cam. Piston pumps of this kind are frequently used in connection with electronic stability systems (ESP) or electrohydraulic brake systems (EHB). Basically, the known piston pumps have a pressure chamber situated between an inlet valve and an outlet valve and the movement of the piston builds up a pressure in this pressure chamber. In order to achieve the most compact design possible, there are known piston pumps in which the hydraulic fluid is supplied to the pressure chamber by means of bores provided in the piston. The inlet valve is situated at the pressure chamber end of the piston in the pressure chamber. In this connection, a cage-like retainer must be provided in the pressure chamber for a return spring of the inlet valve. The pressure chamber also contains a return spring for the piston. This large number of parts in the pressure chamber requires a relatively large amount of clearance in such piston pumps. In addition, piston pumps of this kind have only limited pressure build-up dynamics. In the known piston pumps, outlet valves are also used, which are comprised of a sealing seat, a valve-closing ball, a spring for the ball, and a retaining element for the spring. Consequently, the valves of the known piston pumps have a relatively large number of parts, which entails a certain assembly expenditure. Moreover, the known piston pumps have a certain length in the axial direction. ADVANTAGES OF THE INVENTION [0003] The piston pump according to the invention, which is for delivering hydraulic fluid and has the characterizing features of claim 1, has the advantage over the prior art of having a small number of parts. This permits a significant reduction in the manufacturing and assembly costs. Due to the reduced number of parts, the piston pump according to the invention is also compact, particularly in the axial direction of the piston pump. This is achieved according to the invention by virtue of the fact that at least one valve of the piston pump has a spring sealing element. The spring sealing element is composed of a spring region and a sealing region. In other words, according to the invention, a one-piece spring sealing element is provided, which performs both the function of a valve-closure element and the function of a valve spring. Consequently, the number of parts in a pressure chamber of the piston pump is reduced so that the structural size is minimized. [0004] The dependent claims disclose advantageous modifications of the invention. [0005] Preferably, the spring sealing element is embodied in the form of a plate-shaped element and includes a sealing region, a spring region, and a retaining region. As a result, the piston pump according to the invention can be particularly compact and small since the valve requires only the amount of space occupied by the thickness of the plate-shaped element. In addition, a retaining region is also integrated into the spring element. [0006] It is particularly preferable for the spring region of the spring sealing element to be embodied so that it has at least one spring coil. [0007] It is also preferable for the retaining region of the spring sealing element to be embodied in an annular form. On the one hand, this permits a rapid and simple fixing of the spring sealing element and on the other hand, the annular retaining region lends the spring sealing element a certain amount of stability. [0008] In order to obtain an improved sealing action, the spring sealing element preferably seals against a through opening in a valve plate. In this case, the valve plate performs the function of a valve seat. It is particularly preferable for the valve plate to be manufactured of a plastic, in particular PEEK. It is also preferable for the plastic to be reinforced by means of carbon fibers. [0009] Preferably, the valve is situated together with the spring sealing element inside a cylinder element in which the piston moves. [0010] The piston pump valve according to the invention can be provided as an inlet valve and/or outlet valve of the piston pump. It is particularly preferable, however, for the valve to be provided as an inlet valve and for the spring sealing element to be situated in the pressure chamber of the piston pump. The integral design of the spring sealing element makes it possible to minimize the clearance in the piston pump. In addition, it is possible for an inlet bore of the piston pump to have a very large diameter so as to achieve the lowest possible flow resistance through the inlet bore during the intake phase. This makes it possible to further improve the efficiency of the pump. [0011] The plate-shaped spring sealing element is thus a kind of leaf spring placed over a through opening of the valve and has a disk-shaped sealing region that has a diameter slightly larger than the diameter of the through opening. A seal is thus produced at the edge of the disk-shaped sealing region. [0012] It is also preferable if a return spring for a piston is situated in the pressure chamber of the piston pump in such a way that the return spring is supported against the retaining region of the spring sealing element. This permits an additional fixing of the spring sealing element. [0013] It is particularly preferable if the valve is embodied in the form of an inlet valve of the piston pump and is situated in a cylinder element of the piston pump in such a way that a through flow direction of the inlet valve is the same as a movement direction of the piston during the intake phase of the piston pump. This achieves a particularly flow-favorable path during the intake phase of the piston pump. This can improve the efficiency of the piston pump. [0014] In addition, it is possible to achieve a piston pump with a very small structural size in the radial direction of the piston. This is achieved by virtue of the fact that a spring element of a valve of the piston pump is preferably embodied in the form of a spring ring. Embodying the spring element in the form of a spring ring means that in addition to its spring function, the spring element can also be situated in the piston pump in such a way that no additional components are required for fixing the spring ring since the annular form of the spring ring allows it to be affixed to an existing component of the piston pump without requiring additional parts. [0015] The spring ring preferably has a slit. It is possible to adjust the spring force of the spring ring by embodying this slit in different ways. Consequently, one spring ring can be used for various applications and its spring force can be changed by varying the embodiment of the slit in the spring ring. It is preferable for the slit in the spring ring to be embodied as Z-shaped. The slit preferably passes through the width of the spring ring so that the spring ring is split in the circumference direction. It is also possible, however, to provide a number of slits in the spring ring, which do not divide the spring ring all the way across its width. [0016] Preferably, the spring ring is placed in a groove provided in a cylinder element of the piston pump. This makes it possible to implement a particularly compact design. [0017] In order to affix a valve-closure element to the spring ring, the inside of the spring ring is preferably provided with a recess. If the valve-closure element is a ball, then the recess is preferably a U-shaped channel or a partially spherical recess. This permits an automatic centering of the ball. [0018] It is particularly preferable for the valve including the spring ring to be an outlet valve of the piston pump. [0019] Preferably, a through opening, which can be opened or closed by the outlet valve, is situated in a cylinder element of the piston pump in such a way that a movement direction of the piston is perpendicular to an outflow direction through the through opening. [0020] It is particularly preferable for the piston pump according to the invention to be used in vehicle brake systems, for example to control and regulate a pressure in a wheel brake cylinder. Preferably, the piston pump according to the invention is used in connection with electronic control and regulating systems of the brake system, e.g. ESP, EHB, TCS, etc. On the one hand, this can achieve cost advantages for such brake systems since the piston pump according to the invention is particularly inexpensive to manufacture and on the other hand, an efficiency of pump pistons and improved pressure build-up dynamics can be achieved, thus permitting a reduction in the reaction times of such brake systems. DRAWINGS [0021] The invention will be described in detail below in a preferred exemplary embodiment in conjunction with the drawings. Continue reading about Piston pump with improved pressure build-up dynamics... Full patent description for Piston pump with improved pressure build-up dynamics Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Piston pump with improved pressure build-up dynamics patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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