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1
US20030051712A1
Publication/Patent Number: US20030051712A1
Publication date: 2003-03-20
Application number: 09/955,528
Filing date: 2001-09-18
Abstract: A subassembly module including a pintle bearing, bearing retaining spring, and bearing splash shield for an exhaust gas recirculation (EGR) valve for an internal combustion engine. The bearing is provided with a circumferential flange for sealing with an outer surface of the valve body, and with an annular step in the flange for receiving the rolled or crimped skirt of the bearing splash shield. The bearing retaining spring surrounding the valve pintle is compressed and captured within the splash shield as the skirt is formed onto the annular step to form the module. The axial length of the module is slightly greater than the assembled distance between the valve body and the actuator of the EGR valve, such that the module is compressed by installation of the actuator onto the valve body, allowing the compressed spring to urge the bearing face sealingly against the valve body. Advantageously, the subassembly module may be pre-assembled offline by known methods to reduce complexity during assembly of the valve. A subassembly module including a pintle bearing, bearing retaining spring, and bearing splash shield for an exhaust gas recirculation (EGR) valve for an internal combustion engine. The bearing is provided with a circumferential flange for sealing with an outer surface of the ...more ...less
2
US20020104977A1
Publication/Patent Number: US20020104977A1
Publication date: 2002-08-08
Application number: 09/777,471
Filing date: 2001-02-06
Abstract: An improved electric solenoid for providing linear mechanical actuation. The outer polepiece of the solenoid is provided with an axial, self-lubricated, non-magnetic bearing for closely supporting and centering an actuating shaft extending coaxially from the solenoid armature. Preferably, the radial tolerance between the diameters of the bearing inner bore and the shaft is as small as in practically possible without inducing drag of the shaft in the bearing, permitting reduction of the air gap between the armature and the polepieces to a minimal thickness. Preferably, the armature is axially tapered to avoid contact of the armature with the polepieces as a result of residual tolerances between the bearing and shaft. A significant increase in actuating force is realized in comparison with a prior art solenoid, and the improved solenoid may be used in any desired orientation. An improved electric solenoid for providing linear mechanical actuation. The outer polepiece of the solenoid is provided with an axial, self-lubricated, non-magnetic bearing for closely supporting and centering an actuating shaft extending coaxially from the solenoid armature ...more ...less
3
US20020113222A1
Publication/Patent Number: US20020113222A1
Publication date: 2002-08-22
Application number: 09/790,271
Filing date: 2001-02-21
Abstract: A system for containing leakage along a pintle shaft in a pintle-type gas control valve, such as an exhaust gas recirculation valve for an internal combustion engine or a reformate diverter valve for a fuel cell, comprising a novel seal element and means for sealing the element to the valve's pintle shaft bearing and to an interrupted pintle shaft. The system comprises two elements: a positive vapor block in the form of an elastomeric boot or folded diaphragm disposed across the pintle interruption, and a pintle shaft bearing disposable in the valve's body and sealingly secured to the boot or diaphragm. The system may include a coil spring disposed in compression within the boot or diaphragm. A system for containing leakage along a pintle shaft in a pintle-type gas control valve, such as an exhaust gas recirculation valve for an internal combustion engine or a reformate diverter valve for a fuel cell, comprising a novel seal element and means for sealing the element ...more ...less
4
US20020104978A1
Publication/Patent Number: US20020104978A1
Publication date: 2002-08-08
Application number: 09/778,538
Filing date: 2001-02-07
Abstract: The present invention is directed to an annular metal-bristled brush for cleaning the pintle shaft of a pintle valve, such as an exhaust gas recirculation valve for an internal combustion engine, to prevent coking and failure of the valve. The brush surrounds the shaft, the tips of the bristles making contact with the shaft with sufficient force to dislodge incipient coke deposits but with insufficient force to inhibit the axial motion of the pintle shaft in actuation. Preferably, the brush is disposed in an annular space in the valve body between the pintle shaft bearing and the gas-metering chamber such that the shaft is brushed in both directions during each actuative cycle of the valve. Preferably, the annular space is slightly larger both axially and radially than the corresponding dimensions of the brush so that the brush is free to float without binding the pintle shaft. The present invention is directed to an annular metal-bristled brush for cleaning the pintle shaft of a pintle valve, such as an exhaust gas recirculation valve for an internal combustion engine, to prevent coking and failure of the valve. The brush surrounds the shaft, the tips ...more ...less
5
US20020112707A1
Publication/Patent Number: US20020112707A1
Publication date: 2002-08-22
Application number: 09/790,267
Filing date: 2001-02-21
Abstract: A flow modifier for insertion into the chamber of a large pintle valve to change the apparent flow range of the valve to that of a smaller valve. The flow modifier includes a perforated cup-shaped restrictor disposed within the valve on the valve pintle and sealingly surrounding the valve seat such that all flow through the valve must pass through the passageways in the restrictor. The restrictor is held in place by a compression spring surrounding the pintle. The total open area of the passageways may be varied by varying their number and/or size and is preferably substantially less than the open area of the valve seat. The restrictor thus acts as a flow choke or fixed throttle to reduce the flow range of the valve. Different restrictors may be provided as required to size a single large valve having a large inherent flow range to a plurality of applications requiring valves having smaller flow ranges. A further embodiment includes a valve head resiliently and articulably mounted on the internal end of the valve pintle. The head is free to move axially and/or radially and/or rotationally with respect to the pintle as directed by the mating surface of the valve seat to effect a seal therewith. A flow modifier for insertion into the chamber of a large pintle valve to change the apparent flow range of the valve to that of a smaller valve. The flow modifier includes a perforated cup-shaped restrictor disposed within the valve on the valve pintle and sealingly surrounding ...more ...less
6
US20020060620A1
Publication/Patent Number: US20020060620A1
Publication date: 2002-05-23
Application number: 10/004,638
Filing date: 2001-12-05
Abstract: A proportionally-controllable solenoid including primary and secondary pole pieces that surround an armature axially movable along an axial channel within the pole pieces. The pole pieces are separated axially by an air gap and are conically tapered toward the gap. The leading and trailing faces of the armature are substantially orthogonal to its direction of travel to minimize radial parasitic forces on these faces. Further, the armature is also lengthened such that the trailing face is always outside the axial channel in the secondary pole piece at all points of axial travel to minimize the pullback effect of axial flux vectors on the trailing face. A proportionally-controllable solenoid including primary and secondary pole pieces that surround an armature axially movable along an axial channel within the pole pieces. The pole pieces are separated axially by an air gap and are conically tapered toward the gap. The leading ...more ...less
7
US20010033214A1
Publication/Patent Number: US20010033214A1
Publication date: 2001-10-25
Application number: 09/777,322
Filing date: 2001-02-06
Abstract: The present invention is directed to an improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with a plurality of radially-dispersed labyrinthine passageways in communication between the exterior of the solenoid and an interior region including the armature and the interior of the windings. The polepiece is further provided with at least one passageway in communication between the exterior of the solenoid and an outer periphery of the windings within the housing. The two sets of passageways impede particles and droplets of moisture from entering the solenoid, while simultaneously permitting moisture such as condensation within the solenoid to evaporate and escape. The present invention is directed to an improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with a plurality of radially-dispersed labyrinthine passageways in communication between the exterior of the solenoid and an interior region ...more ...less
8
US20010032678A1
Publication/Patent Number: US20010032678A1
Publication date: 2001-10-25
Application number: 09/778,571
Filing date: 2001-02-07
Abstract: An expanded-range pintle valve comprising a plurality of stages. Each stage comprises a valve seat and head capable of regulating flow through the valve over its own dynamic range. The valve head of a higher-flow stage includes the valve seat for the next-lower flow stage. The heads and seats for the multiple stages are nested concentrically, the progressively lower-flow stages having progressively smaller diameters. All valve heads except the lowest-flow head have axial and radial bores permitting flow therethrough so that flow may be regulated first by actuating the lowest-flow stage, then by actuating successively higher flow stages. A single pintle shaft connected to a solenoid actuator is adapted to engage each of the valve heads sequentially as the actuator progresses, beginning with the lowest-flow head, thereby extending incrementally the dynamic range of the valve as each stage is successively engaged. An expanded-range pintle valve comprising a plurality of stages. Each stage comprises a valve seat and head capable of regulating flow through the valve over its own dynamic range. The valve head of a higher-flow stage includes the valve seat for the next-lower flow stage. The ...more ...less
9
US20010032633A1
Publication/Patent Number: US20010032633A1
Publication date: 2001-10-25
Application number: 09/781,646
Filing date: 2001-02-12
Abstract: An improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with an axial journal bearing for supporting an actuating shaft extending from the solenoid armature. Radial tolerance between the bearing inner bore and the shaft is as small as in practically possible, which feature permits elimination of the prior art portion of the guiding sleeve extending into the outer polepiece, thereby retaining frictional losses with only the remaining sleeve portion in the inner polepiece. Small prior art air gaps at interfaces 42,44 between the polepieces and the housing are eliminated to minimize reluctance of the magnetic circuit. A significant increase in actuating force is realized in comparison with a prior art solenoid actuator. An improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with an axial journal bearing for supporting an actuating shaft extending from the solenoid armature. Radial tolerance between the bearing inner bore and the shaft is as small as ...more ...less
10
US20010032950A1
Publication/Patent Number: US20010032950A1
Publication date: 2001-10-25
Application number: 09/788,738
Filing date: 2001-02-20
Abstract: A novel spatial arrangement of valve ports and hold-down bolt holes in the body of an exhaust gas recirculation valve, wherein the centers of the ports are between and aligned with the centers of the bolt holes, thereby producing maximum sealing force around the ports against the surface to which the valve is bolted, such as the exhaust and intake manifolds of an internal combustion engine. A novel spatial arrangement of valve ports and hold-down bolt holes in the body of an exhaust gas recirculation valve, wherein the centers of the ports are between and aligned with the centers of the bolt holes, thereby producing maximum sealing force around the ports against ...more ...less
11
US20010032630A1
Publication/Patent Number: US20010032630A1
Publication date: 2001-10-25
Application number: 09/778,609
Filing date: 2001-02-07
Abstract: An improved modular, radially-compliant, redundantly-sealing journal-type bearing assembly comprising two bearing elements retained in a housing and positively loaded in opposing directions by a compression spring disposed therebetween. A shaft to be supported and sealed against leakage by the bearing, such as a valve pintle shaft, is disposed in an axial bore in each of the bearing elements, which bores are fitted as closely to the diameter of the shaft as is possible without causing the shaft to bind in the bores. Each of the radial bearing faces opposite the spring forms a seal with a corresponding internal surface of the housing, defining thereby a redundant sealing system. The bearings are radially compliant within the housing by a predetermined small distance to allow the shaft to be operatively self-centered, such as by an attached valve head mating into a valve seat. The improved bearing assembly may be preassembled offline to facilitate its incorporation into an apparatus, for example, a fuel cell valve, and may also be retrofitted into existing apparatus, for example, an exhaust gas recirculation valve. An improved modular, radially-compliant, redundantly-sealing journal-type bearing assembly comprising two bearing elements retained in a housing and positively loaded in opposing directions by a compression spring disposed therebetween. A shaft to be supported and sealed against ...more ...less
12
US20010032634A1
Publication/Patent Number: US20010032634A1
Publication date: 2001-10-25
Application number: 09/788,741
Filing date: 2001-02-20
Abstract: A leakage arresting system comprising a novel gas arrestor for installation on an interrupted pintle shaft in a pintle-type valve, such as an exhaust gas recirculation valve for an internal combustion engine, for preventing leakage of gas and moisture along the pintle shaft into the actuator, to prevent corrosion and failure of the actuator. The system comprises two elements: a pintle shaft which is interrupted outside the actuator, and a positive vapor block in the form of a cup-shaped arrestor disposed across the pintle interruption. The invention is applicable to both unbalanced and force-balanced valves. A leakage arresting system comprising a novel gas arrestor for installation on an interrupted pintle shaft in a pintle-type valve, such as an exhaust gas recirculation valve for an internal combustion engine, for preventing leakage of gas and moisture along the pintle shaft into ...more ...less
13
US20010049043A1
Publication/Patent Number: US20010049043A1
Publication date: 2001-12-06
Application number: 09/738,535
Filing date: 2000-12-15
Abstract: A three-way gas control valve assembly for selectively controlling gas flow from one inlet port into two outlet ports or vice-versa, such as may be required for flow control of hydrogen-containing reformate in fuel cell applications. The valve assembly comprises three subassemblies: a metering subassembly disposable within the high-temperature environment in the fuel cell for mechanically regulating reformate flow; an actuating subassembly disposable outside the fuel cell and connected to the metering subassembly for actuating a pintle shaft and valve head in the metering subassembly; and a coupling tube subassembly extendable through an insulative shroud to mechanically couple and thermally isolate the metering and actuating subassemblies. A three-way gas control valve assembly for selectively controlling gas flow from one inlet port into two outlet ports or vice-versa, such as may be required for flow control of hydrogen-containing reformate in fuel cell applications. The valve assembly comprises three ...more ...less
14
US20010032953A1
Publication/Patent Number: US20010032953A1
Publication date: 2001-10-25
Application number: 09/788,740
Filing date: 2001-02-20
Abstract: A shield for a gas management pintle valve, such as an exhaust gas recirculation valve for an internal combustion engine, for mitigating leakage of gas and moisture along the valve pintle into the actuator, to prevent corrosion and failure of the actuator. The shield is a tubular member having an equatorial radial flange and is slidably mounted on the pintle in an annular chamber between the valve body and the actuator. The inner diameter of the tube is selected to be as close-fitting to the pintle as possible while still being slidable thereupon to be adapted to either of two operating positions. During engine shutdowns, the shield is drawn by gravity toward the valve body to form a first seal with the flange against the pintle bearing or a bearing splash shield, preventing or minimizing the escape of moist, hot gases under low pressure from the valve along the pintle. During engine running, high-pressure exhaust gases within the valve may be forced along the pintle through the bearing bore and bearing splash shield toward the actuator. The gases force the shield to slide along the pintle, opening the first seal and forming a second seal with the flange against the actuator, allowing the leaked gases to escape radially from the pintle without invading the actuator. A shield for a gas management pintle valve, such as an exhaust gas recirculation valve for an internal combustion engine, for mitigating leakage of gas and moisture along the valve pintle into the actuator, to prevent corrosion and failure of the actuator. The shield is a ...more ...less
15
WO0114772A1
Publication/Patent Number: WO0114772A1
Publication date: 2001-03-01
Application number: 0022606
Filing date: 2000-08-18
Abstract: A gas management valve (10) includes a metering subassembly (14)