# US 2013/0156613 A1 · High performance electronic stability control pump assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156613 A1 - Document ID: US20130156613A1 - Status: Published application - Kind: A1 - Application number: 13/518,819 - Filed: 2010-11-03 - Published: 2013-06-20 - Earliest claimed: 2010-08-23 - Assignees: Beijingwest Industries Co., Ltd. - Inventors: David F. Reuter; Adam M. Osswald; Jay P. Johnson - Web page: https://patentgrep.com/patent/US20130156613A1 ## CPC - F04B 39/16: Filtration; Moisture separation - B60T 8/4031: {Pump units characterised by their construction or mounting (pump units in combination with valve blocks B60T8/36)} - B60T 17/02: Arrangements of pumps or compressors, or control devices therefor - B60T 17/04: Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses (traction couplings involving joints for supply lines, electric circuits, or the like B60D1/62; couplings peculiar to railway vehicles for, or combined with, couplings or connectors for fluid conduits or electric cables B61G5/06; pipes, cut-off valves, couplings, air hoses per se F16C, F16K, F16L) - F04B 1/0404: Details or component parts - F04B 1/0452: Distribution members, e.g. valves (machines or pumps with cam-actuated distribution members at the outer ends of the cylinders F04B1/0472; machines or pumps with cam-actuated distribution members at the inner ends of the cylinders F04B1/0531; the piston-driving cams being provided with inlets and outlets F04B1/0535) - F04B 11/0091: {using a special shape of fluid pass, e.g. throttles, ducts} - F04B 53/20: Filtering - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES ## Abstract A piston pump assembly for pumping a fluid including a pump housing defining a bore. The pump housing further defines a fluid inlet and a fluid outlet and a fluid flow path extending therebetween for conveying the fluid from the fluid inlet to the fluid outlet. A piston is slidably disposed in the bore of the pump housing, and an eccentric engages the piston to propel the fluid through the fluid flow path. An inlet check valve and an outlet check valve body are disposed in the bore for only allowing the fluid to flow in one direction from the fluid inlet to the fluid outlet. A filter is disposed in the fluid flow path downstream of the inlet check valve and the outlet check valve body and adjacent to a damper orifice for filtering debris from the fluid before the fluid is conveyed to the fluid outlet. ## Claims ### Claim 1 A pump assembly for pumping a fluid comprising: a pump housing defining: a bore extending along an axis; a fluid inlet for conveying the fluid into said bore; and a fluid outlet spaced axially from said fluid inlet for dispensing the fluid out of said bore; and presenting a fluid flow path extending from said fluid inlet to said fluid outlet, a piston slidably disposed in said bore of said pump housing for propelling the fluid through said fluid flow path, an eccentric engaging said piston for driving said piston to propel the fluid through said fluid flow path, at least one check valve disposed in said fluid flow path for only allowing the fluid in said fluid flow path to flow in one direction from said fluid inlet to said fluid outlet, a filter disposed in said bore of said pump housing and defining at least one filter orifice for filtering debris from the fluid before the fluid is conveyed to said fluid outlet of said pump housing, and said filter being disposed in said fluid flow path downstream of said at least one check valve. ### Claim 2 (depends on 1) The assembly as set forth in claim 1 wherein said filter includes a plurality of filter orifices. ### Claim 3 (depends on 1) The assembly as set forth in claim 1 further including a damper disposed in said fluid flow path of said bore of said pump housing downstream of said at least one check valve and including a damper orifice for damping pressure pulsations in the fluid. ### Claim 4 (depends on 3) The assembly as set forth in claim 3 wherein said filter engages said damper downstream of said at least one check valve. ### Claim 5 (depends on 1) The assembly as set forth in claim 1 wherein said bore comprises a first bore section having a first diameter, a second bore section having a second diameter greater than said first diameter and a third bore section having a third diameter greater than said second diameter. ### Claim 6 (depends on 5) The assembly as set forth in claim 5 wherein said fluid inlet is in fluid communication with said second bore section and said fluid outlet is in fluid communication with said third bore section. ### Claim 7 (depends on 6) The assembly as set forth in claim 6 further including a sleeve press-fit into said second bore section. ### Claim 8 (depends on 7) The assembly as set forth in claim 7 wherein said sleeve defines at least one sleeve orifice axially aligned with said fluid inlet for conveying the fluid in said fluid flow path from said fluid inlet into said sleeve. ### Claim 9 (depends on 8) The assembly set forth in claim 8 wherein said sleeve has at least three different material thicknesses. ### Claim 10 (depends on 9) The assembly set forth in claim 9 wherein said sleeve includes a low thickness area around said sleeve orifice for ease of manufacture. ### Claim 11 (depends on 10) The assembly set forth in claim 10 wherein said sleeve includes a medium thickness area to present a clearance gap between said sleeve and said second bore section of said pump housing for permitting precise inside diameter tolerance control for fitting with said slidable piston and maintaining sufficient strength to support pump pressure loads. ### Claim 12 (depends on 11) The assembly set forth in claim 11 wherein said sleeve includes a high thickness area for precise outside diameter tolerance control for a fluid-tight press fit with said second bore section of said pump housing and wherein the inside diameter is positioned in a non-critical area of said pump assembly to allow for increased manufacturing tolerances and for allowing precise tolerance control for a fluid-tight press with an outlet check valve seat. ### Claim 13 (depends on 7) The assembly set forth in claim 7 wherein one end of said sleeve is bent radially inwardly at a 15 degree angle to facilitate ease of assembly of said slidable piston while being sufficient for forming a seal with said bore of said pump housing and an o-ring in said bore. ### Claim 14 (depends on 1) The assembly as set forth in claim 1 wherein said piston defines a flow passage for conveying the fluid from the fluid inlet along the fluid flow path. ### Claim 15 (depends on 1) The assembly as set forth in claim 1 wherein said at least one check valve includes an inlet check valve and an outlet check valve, said filter being disposed in said fluid flow path downstream of said outlet check valve. ### Claim 16 (depends on 15) The assembly as set forth in claim 15, wherein said inlet check valve engages said piston for conveying the fluid in said fluid flow path only out of said flow passage of said piston and into said bore of said pump housing. ### Claim 17 (depends on 16) The assembly as set forth in claim 16 wherein said inlet check valve includes a spring retainer defining an inlet valve spring seat spaced axially from said piston and includes a flat disc disposed between said piston and said inlet valve spring seat and includes an inlet check valve spring extending between said inlet valve spring seat of said spring retainer and said flat disc for biasing said flat disc against said piston to allow the fluid in said fluid flow path to flow out of said flow passage of said piston and into said bore only in response to the pressure of the fluid in said flow passage exceeding the pressure of the fluid in said bore by a predetermined magnitude. ### Claim 18 (depends on 17) The assembly as set forth in claim 17 wherein said outlet check valve including an outlet check valve seat spaced axially from said piston in said bore of said pump housing for defining a first chamber between said piston and said outlet check valve seat. ### Claim 19 (depends on 18) The assembly as set forth in claim 18 further including a piston return spring disposed in said first chamber and extending between said outlet check valve seat and said piston for biasing said piston against an eccentric. ### Claim 20 (depends on 19) The assembly as set forth in claim 19 further including a damper cup disposed in said bore of said pump housing and spaced axially from said outlet check valve seat to define a second chamber between said outlet check valve seat and said damper cup. ### Claim 21 (depends on 20) The assembly as set forth in claim 20 wherein said outlet valve seat defines an outlet valve seat orifice for conveying the fluid from said first chamber to said second chamber. ### Claim 22 (depends on 21) The assembly as set forth in claim 21 wherein said outlet check valve further includes an outlet valve body disposed in said second chamber. ### Claim 23 (depends on 22) The assembly as set forth in claim 22 further including an outlet check valve spring extending between said outlet valve body and said damper cup for biasing said outlet valve body against said outlet check valve seat to only allow the fluid to flow through the outlet valve seat in the direction from said first chamber to said second chamber. ### Claim 24 (depends on 23) The assembly as set forth in claim 23 wherein said outlet valve body has a spherical shape. ### Claim 25 (depends on 14) The assembly as set forth in claim 14 wherein said piston is of a polyether ether ketone material.