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Piston pumpRelated Patent Categories: Pumps, Expansible Chamber Type, Valved Piston, Reciprocating, Ball TypePiston pump description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070092389, Piston pump. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a piston pump for supplying pressure fluid into at least one vehicle brake, into a master cylinder, into a pressure fluid reservoir or into a pressure fluid accumulator of a controlled vehicle brake system. [0002] A piston pump of this type is e.g. disclosed in DE 100 22 811 A1 and comprises, among others, a sleeve retained in a stepped bore. This sleeve is pressed into the stepped bore by a closing member that abuts axially on a bottom of the sleeve. It is disadvantageous in this type of construction that the pressing and attaching forces introduced into the sleeve may cause a deformation of a seat for a non-return valve. This jeopardizes the operational safety of the vehicle brake system. [0003] A generic piston pump is described in DE 197 53 083 A1. A closing member bears in an axial direction directly against the sleeve, pressing it axially against a bore step. The forces introduced through the sleeve and a conical abutment surface of the sleeve in the area of the non-return valve can cause a deformation of the sleeve in the area of the valve seat. [0004] In view of the above, an object of the invention is to disclose a means permitting an integration of a piston-pump subassembly into an accommodating member, while in particular valve seats of non-return valves can be retained so as to be free from pressing or attaching forces being due to the assembly and from resultant deformations. SUMMARY OF THE INVENTION [0005] According to the invention, this object is achieved in that the sleeve includes a radial flange, and in that the radial flange is compressed between the closing member and the accommodating member for securing the sleeve in position in an axial direction. This measure is used to retain the pump subassembly in the accommodating member, while the necessary attaching forces are introduced into the sleeve at a point spaced from the seat of non-return valves, thereby preventing that the sealing effect of the non-return valves is impaired. [0006] In a favorable embodiment of the invention, the stepped bore has a bore step with a bore diameter that is designed larger than the radial flange so that an exclusively axial abutment of the radial flange prevails. This prevents an application of force at the periphery of the sleeve which causes out-of-true operation or deformations of the sleeve. [0007] It is furthermore favorable that the sleeve includes a bowl-shaped portion which is used as a support for the resetting spring and has a cylindrical wall and a bottom on which one end of the resetting spring is abutting. This obviates the need for a separate assembly of a separate spring retainer in the accommodating member. [0008] A portion of the sleeve can be substantially V-shaped or U-shaped in cross-section so that an indentation provided between the wall and a collar is used to accommodate the resetting spring, and an outside indentation formed by the collar accommodates a non-return valve in such a fashion that resetting spring, sleeve and non-return valve intersect at least in the area of the portion in a radial direction. An arrangement of the components involved that achieves especially short dimensions is thereby given, and a seat for a non-return valve can be provided in the bottom area of the sleeve. The seat is preferably provided at the collar. [0009] Centering of the spring is enabled when the collar in the seat area has a substantially conical portion, the diameter of said portion corresponding basically to the diameter of the resetting spring and the portion engaging the resetting spring. The conicalness facilitates the placement in the event of an inexact feeding of components. [0010] The mounting space requirement is furthermore reduced when the closing member has a bowl-shaped design and includes a wall and a bottom, and the bowl-shaped portion of the sleeve is accommodated in an inner space of the closing member, and an end surface of the wall maintains the radial flange in abutment on the bore step. [0011] Essential parts of the piston pump, in particular the sleeve and the portion, due to the protuberances are formed as sheet-metal shaped parts being fastened in the area of the radial flange to the closing member by means of calked or pressed engagement. [0012] In principle, the pump of the invention shows a good aspiration behavior, even at low temperatures of the pressure fluid, because the construction allows correspondingly expanded aspiration cross-sections especially as regards the channel routing and the piston configuration. [0013] Further details of the invention can be taken from the following description making reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS [0014] In the drawings: [0015] FIG. 1 shows a cross-sectional, enlarged view of a first and second embodiment of a piston pump separated by an axle center; [0016] FIG. 2 shows an enlarged view of a variant according to FIG. 1; [0017] FIG. 3 shows a third embodiment of a piston pump; [0018] FIGS. 4a-c show details of different sleeves, which are principally based on the embodiment shown in FIG. 3. DETAILED DESCRIPTION OF THE DRAWINGS [0019] FIG. 1 shows an assembly 1 with a schematically illustrated drive 2, in particular an electric motor, which is flanged to an accommodating member 3 for electromagnetically operable valves, channels, accumulator or damper chambers and to a piston pump 10. An electronic control unit 4 (shown only schematically) is provided on an opposite side of the accommodating member 3. The illustrated assembly 1 is in particular used for slip control or driving stability control in motor vehicles, yet similar or different cases of application are also feasible. [0020] A preferably central stepped bore 5 of the accommodating member 3 accommodates a sealed roller bearing 6 of the drive shaft 7 whose free end is designed as an eccentric 8 projecting into a crank chamber 9 of the stepped bore 5. It is principally possible that the eccentric 8 is ground out directly at the drive shaft 7 or motor shaft, or is designed as a separate component and attached to the drive shaft. For an extended pump operation life the crank chamber 9 can be flooded with leakage fluid, especially with brake fluid, and a reservoir connected to the crank chamber 9 is used for the fluid take-up within the drive 2, the accommodating member 3 or the electronic control unit 4. Continue reading about Piston pump... Full patent description for Piston pump Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Piston pump 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. Start now! - Receive info on patent apps like Piston pump or other areas of interest. ### Previous Patent Application: Pump assembly for an emergency eyewash station Next Patent Application: Scroll compressor Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Piston pump patent info. IP-related news and info Results in 0.64411 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , 174 |
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