Source: http://www.google.com/patents/US4967966?dq=5754119
Timestamp: 2014-04-24 04:32:47
Document Index: 430736586

Matched Legal Cases: ['art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 6', 'art 39', 'art 6', 'art 39', 'art 39', 'art 39', 'art 39', 'art 39', 'art 6', 'art 39']

Patent US4967966 - Electromagnetically actuatable valve - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn electromagnetically actuatable valve having a connection fitting serving as a core and on which a magnet coil is disposed, is produced with a non-bulky valve housing of ferromagnetic metal. This valve housing is simple to manufacture with a reduced external valve size. The valve is provided with a...http://www.google.com/patents/US4967966?utm_source=gb-gplus-sharePatent US4967966 - Electromagnetically actuatable valveAdvanced Patent SearchPublication numberUS4967966 APublication typeGrantApplication numberUS 07/354,566Publication dateNov 6, 1990Filing dateMay 22, 1989Priority dateJul 23, 1988Fee statusPaidAlso published asCN1014352B, CN1039888A, DE3825135A1, EP0352445A1, EP0352445B1Publication number07354566, 354566, US 4967966 A, US 4967966A, US-A-4967966, US4967966 A, US4967966AInventorsRudolf Babitzka, Ferdinand Reiter, Max GreinerOriginal AssigneeRobert Bosch GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (7), Referenced by (21), Classifications (22), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetElectromagnetically actuatable valveUS 4967966 AAbstract An electromagnetically actuatable valve having a connection fitting serving as a core and on which a magnet coil is disposed, is produced with a non-bulky valve housing of ferromagnetic metal. This valve housing is simple to manufacture with a reduced external valve size. The valve is provided with a plastic sheathing that surrounds not only a connection fitting but also a magnet coil and at least in the region surrounding the magnet coil includes a ferromagnetic element that conducts magnetic field lines. These ferromagnetic elements are embodied by conducting elements and optionally by fillers having ferromagnetic properties, which at least partly surround the magnet coil in the circumferential direction. This embodiment of the valve is suitable for all types of electromagnetically actuatable components.
What is claimed and desired to be secured by letters patent of the United States is: 1. An electromagnetically actuatable valve for fuel injection systems of internal combustion engines, having a ferromagnetic metal connection fitting (1) which serves as a core having a core end (2) and which extends along a longitudinal valve axis, a valve seat body (8) including a fixed valve seat (9), a magnet coil (3) disposed about a portion of said core end (2) of said connection fitting, an armature (12) operable by said magnet coil and said core, a valve closing body (14) disposed on said armature, said valve closing body cooperating with said fixed valve seat, at least one tubular, non-magnetic sheet metal intermediate part (6) connected to said core end (2) of the connecting fitting (1) facing the armature (12) which extends toward said valve seat body (8), a plastic sheathing (24) surrounding a portion of said connection fitting, said plastic sheathing (24) likewise surrounds said magnet coil (3), and ferromagnetic, conducting elements that conduct magnetic field lines are provided at least in a part of said plastic sheathing (24) which surrounds at least a portion of said magnet coil (3), and at least one magnetic conducting ferromagnetic element (28) disposed in said plastic sheathing (24) such that said ferromagnetic element extends in an axial direction over the entire length of said magnet coil (3) and at least partly surrounds said magnetic coil (3) in a circumferential direction.
BACKGROUND OF THE INVENTION The invention is based on an electromagnetically actuatable valve as defined hereinafter. In a known electromagnetically actuatable valve (U.S. Pat. No. 4,610,080) the magnet coil, for conducting the magnetic field lines, is surrounded by a metal valve housing made of ferromagnetic material. The result is not only high labor costs for manufacturing the metal valve housing, but also a large diameter and an undesirably high weight of the valve, since for static reasons the wall thickness of the valve housing is made thicker than required for conducting the magnetic field lines. Eddy currents ar also undesirably developed in the metal housing. The known valve also has a plastic intermediate part disposed between the valve housing and the valve seat body, which presents a possibility that thermal expansion or swelling of the plastic will cause this part to change its position, such that the valve needle will jam or the stroke of the valve needle, provided between the armature and the core, will undesirably change.
OBJECT AND SUMMARY OF THE INVENTION The valve according to the invention has an advantage over the prior art in that the outer contour of the valve can easily and simply be adapted to requirements at an intended installation site of the valve. The valve can be manufactured simply and cost effectively with smaller circumferential dimensions in a manner that assures that operating safety requirements for the valve are met. The development of eddy currents at the circumference of the valve is also avoided.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first exemplary embodiment of a valve equipped in accordance with the invention;
DESCRIPTION OF THE PREFERRED EMBODIMENTS The electromagnetically actuatable valve shown in FIG. 1, shown in the form of an injection valve for fuel, forms a component of a fuel injection system of a mixture-compressing internal combustion engine with externally supplied ignition, and has a tubular metal connection fitting 1 of ferromagnetic material, on the core end 2 of which a magnet coil 3 is disposed. The connection fitting 1 thus simultaneously serves as the core. Adjoining the core end 2 of the connection fitting 1, concentrically with the longitudinal valve axis 4, an intermediate part 6 is tightly joined to the connection fitting 1 for instance by soldering or welding. The intermediate part 6 is made of nonmagnetic metal and includes a collar 7 which fits around the core end 2. Remote from the connection fitting 1, a metal valve seat body 8 is joined to the intermediate part 6 and has a fixed valve seat 9 toward the core end 2 of the connection fitting 1. The connection between the intermediate part 6 and the valve seat body 8 is likewise made tight; it can be effected by screwing, welding or soldering, for example. The alignment of the connection fitting 1, intermediate part 6 and valve seat body 8 with one another furnishes a rigid metal unit. The intermediate part 6 is tubular in embodiment and has a coaxial guide bore 11 into which an armature 12 extends. The armature is guided during its displacement movement by the guide bore and is tubular in embodiment. A valve closing body 14 is disposed in a inner bore 13 of the armature 12, on its end facing the valve seat 9, and is joined to the valve seat and may for instance take the form of a cylindrical segment 15 having a hemispherical end, or some other form which will form a good seat with the valve seat. Flattened areas 16 leading outward are provided on the circumference of the cylindrical segment 15; fuel flowing in from the upper end of the connection fitting 1 can flow past these flattened areas 16 on the inside of the armature 12, out of the inner bore 13 to the valve seat 9, downstream of which at least one injection port 17 is formed in the valve seat body 8.
In the third exemplary embodiment of FIG. 4, elements that remain the same as and function like those of the above embodiments are identified by the same reference numerals. Once again, as in the above embodiments, the magnet coil 3 is surrounded by a plastic sheathing 24, in which at least one conducting element 28 is embedded such that it fits over the magnet coil 3 in the axial and radial directions and has end segments 31 or shell ends 32 on each end, that serve to guide the magnetic field lines around the magnet coil 3. In contrast to the above embodiments, although the armature 12 is still tubular, it is shorter and is connected to a connecting tube 36, which is connected at its other end to the valve closing body 14 embodied as a ball. Through flow openings 37 of the connecting tube 36 that are provided in the wall, radially penetrating it, the fuel flowing in from the interior of the armature 12 can reach the valve seat 9. The intermediate part 6, which is likewise nonmagnetic and is connected to the connection fitting 1, has a radially inwardly extending guide collar 38 with a very short guide bore 11 for guiding the armature 12. A connecting part 39, likewise tubular and made of ferromagentic metal, is tightly connected to the intermediate part 6, and the armature 12 protrudes partway, with play, into this part 39, so that the magnetic field lines close i.e. make a closed circuit toward the armature via the conducting element 28, the end segment 31 and the lower shell end 32 resting on the connecting part 39. The valve seat body 8 is inserted into a retaining bore 41 of the connecting part 39 that is coaxial with the longitudinal valve axis 4 and is retained in this bore by a encompassing crimped rim 42 of the connecting part 39. The required stroke of the valve closing element 14 can be adjusted by means of a shim ring 44 also placed in the retaining bore 41 in the axial direction between the valve seat body 8 and a bore bottom 43 of the connecting part 39. In the exemplary embodiment of FIG. 4, two conducting elements 28 are provided, which may be disposed facing one another as shown in FIG. 5. An identical arrangement is also useful for the embodiment of FIG. 1. For reasons of space, it is also possible to have the electric connection plug 26 extend in a plane that is rotated by 90�, or in other words is vertically on a plane through the guide elements 28. In addition to the conducting elements 28, the exemplary embodiment of FIG. 4 may likewise have ferromagnetic fillers in the plastic sheathing 24, in the vicinity of the magnet coil 3. The elements comprising the connecting fitting 1, intermediate part 6, connecting part 39 and valve seat body 8 form a unit of metal parts rigidly coupled with one another.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3082359 *Jan 26, 1960Mar 19, 1963Peter Paul Electronics CompanySolenoid and valve assemblyUS3757263 *Jul 24, 1972Sep 4, 1973RichdelSolenoid valve operatorUS4483485 *Nov 22, 1982Nov 20, 1984Aisan Kogyo kabuskiki KaishaElectromagnetic fuel injectorUS4564145 *May 17, 1983Jan 14, 1986Aisan Kogyo Kabushiki KaishaElectromagnetic fuel injectorUS4610080 *Jul 29, 1985Sep 9, 1986Allied CorporationMethod for controlling fuel injector liftUS4651931 *Mar 21, 1985Mar 24, 1987Robert Bosch GmbhInjection valveGB1055490A * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5188297 *Feb 14, 1992Feb 23, 1993Aisan Kogyo Kabushiki KaishaPressure tight injectorUS5232167 *Nov 16, 1992Aug 3, 1993Robert Bosch GmbhElectromagnetically actuatable injection valveUS5301874 *May 10, 1991Apr 12, 1994Robert Bosch GmbhAdjusting sleeve for an electromagnetically actuatable valveUS5373992 *Apr 13, 1990Dec 20, 1994Robert Bosch GmbhArmature connection for an electromagnetically actuatable valveUS5518185 *Mar 7, 1994May 21, 1996Nipponfrndo Co., Ltd.Electromagnetic valve for fluid injectionUS5544816 *Aug 18, 1994Aug 13, 1996Siemens Automotive L.P.Housing for coil of solenoid-operated fuel injectorUS5560386 *Mar 19, 1994Oct 1, 1996Robert Bosch GmbhMethod for adjusting a valveUS5875975 *Jun 19, 1996Mar 2, 1999Robert Bosch GmbhFuel injectorUS6045116 *Jan 9, 1998Apr 4, 2000Robert Bosch GmbhElectromagnetically operated valveUS6199776Aug 20, 1998Mar 13, 2001Robert Bosch GmbhFuel injection valve and method for the production of a valve needle for a fuel injection valveUS6357676Nov 19, 1999Mar 19, 2002Robert Bosch GmbhFuel injection valveUS6601786 *May 11, 2001Aug 5, 2003Denso CorporationFuel injection valveUS6631857Dec 22, 2000Oct 14, 2003Caterpillar IncPartially plastic fuel injector component and method of making the sameUS6648298 *Jun 8, 2001Nov 18, 2003Hitachi Car Engineering Co., Ltd.Electromagnetic fuel injection valveUS7070128 *Jun 14, 2002Jul 4, 2006Robert Bosch GmbhFuel injection valveUS8047222 *Oct 18, 2004Nov 1, 2011Wilden Pump And Engineering LlcAir valve for an air driven reciprocating deviceEP0902222A2 *Sep 3, 1998Mar 17, 1999Illinois Tool Works Inc.Electric solenoid valveEP1217204A1 *Oct 31, 2001Jun 26, 2002Caterpillar Inc.Partially plastic fuel injector component and method of making the sameWO1998042976A1 *Jan 9, 1998Oct 1, 1998Bosch Gmbh RobertElectromagnetically operated valveWO1999027246A1 *Aug 20, 1998Jun 3, 1999Andorfer MartinFuel injection valve and method for the production of a valve needle for a fuel injection valveWO2000032926A1 *Nov 19, 1999Jun 8, 2000Bosch Gmbh RobertFuel injection valve* Cited by examinerClassifications U.S. Classification239/585.4, 239/900, 251/129.15International ClassificationF16K31/06, H01F7/16, F02M51/00, F02M51/06, F02M61/16, F02M51/08Cooperative ClassificationY10S239/90, F02M51/0614, H01F2007/085, F02M51/0667, F02M51/0682, F02M61/166, F02M2051/08, H01F7/1607European ClassificationF02M61/16F, F02M51/06B2E1, F02M51/06B2E2B, F02M51/06B1, H01F7/16ALegal EventsDateCodeEventDescriptionMay 21, 2002REMIMaintenance fee reminder mailedApr 25, 2002FPAYFee paymentYear of fee payment: 12Apr 27, 1998FPAYFee paymentYear of fee payment: 8Apr 25, 1994FPAYFee paymentYear of fee payment: 4May 22, 1989ASAssignmentOwner name: ROBERT BOSCH GMBH, STUTTGART, FEDERAL REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BABITZKA, RUDOLF;REITER, FERDINAND;GREINER, MAX;REEL/FRAME:005084/0329;SIGNING DATES FROM 19890417 TO 19890502RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google