Core Or Pole Shape, Structure Or Material Patents (Class 335/281)
-
Patent number: 7535328Abstract: In an electromagnet switch, a stationary iron core is composed mainly of a base part and a disk part. The base part is faced to a plunger and the disk part is forcedly inserted and fixed to a boss part formed in the base part. The disk part is composed of a metal plate of ferromagnetic substance (iron plate) and another substance plate (made of resin or rubber and the like, for example,) of a smaller spring constant or a larger damping coefficient than that of the metal plate. The metal plate and another substance plate are laminated. Another substance plate absorbs or reduces the impact force when the plunger is electromagnetically attracted toward and collides with the base part. The propagation of a large impact noise or crashing sound is thereby suppressed, and as a result the impact noise can be reduced.Type: GrantFiled: February 21, 2007Date of Patent: May 19, 2009Assignee: Denso CorporationInventors: Tadahiro Kurasawa, Shinji Usami, Tomohiro Teramachi
-
Patent number: 7520488Abstract: A two-port solenoid valve, which opens and closes a valve seat by operating a tabular valve member by using electromagnetic force and fluid pressure, capable of improving the responsiveness when the valve member closes the valve seat by the action of the fluid pressure is provided. The slender tabular valve member is disposed inside a valve chamber to which an elongate output orifice and an input orifice are open, and opens and closes the valve seat disposed around the output orifice in the same manner as a poppet valve. The valve seat is opened by attracting the valve member by the action of electromagnetic force applied to a rectangular fixed core, and is closed by the action of pressurized fluid flowing from the input orifice. In this two-port solenoid valve, a fluid chamber for introducing the pressurized fluid flowing from the input orifice and applying the fluid pressure to the valve member is formed in a slender rectangular pole face of the fixed core.Type: GrantFiled: April 21, 2006Date of Patent: April 21, 2009Assignee: SMC CorporationInventor: Shinichi Yoshimura
-
Patent number: 7504920Abstract: A powdered metal electromagnetic is provided that has much less variance between units, increased frictional drag, reduced wear of itself and the brake drum disk during use and an increased resistance to moisture due to the use of a donor material that increases performance and reliability. In addition it can withstand much higher surface speeds while producing higher frictional drag.Type: GrantFiled: September 26, 2001Date of Patent: March 17, 2009Assignee: Tekonsha Engineering CompanyInventor: William E. Richeson
-
Patent number: 7481242Abstract: Directional control valve, in particular a hydraulic 3/2-way directional control valve, having an actuating unit (1) and a valve unit (2), which is operatively connected to the actuating unit and in which a valve element (9), displaceable by the actuating unit (1) and having a tappet (14), controls ducts (4, 5, 6) of the valve unit (2) carrying hydraulic pressure medium, the actuating unit (1) having at least one coil (21), a magnetic core (18), which is arranged at least partially inside the coil (21), is of cylindrical design and has an end-face limit (22), and a moveable armature (15) interacting electromagnetically with the magnetic core (18) and comprising an end face (16), the armature being operatively connected to the tappet (14), the internal dimensions of the magnetic core (18) being larger than the external dimensions of the armature (15) and the magnetic core (18) and the armature (15) being arranged, formed and aligned in conjunction with the length of the tappet (14) so that the end face (16) ofType: GrantFiled: November 29, 2005Date of Patent: January 27, 2009Assignee: Ina-Schaeffler KGInventor: Eduard Golovatai-Schmidt
-
Publication number: 20090002109Abstract: A pole tube including a non-magnetic spacer ring configured to join a pole piece along a control cone and also configured to join a tube piece along a back annular surface. The annular surface includes a first face section and a second face section. The first face section and the second face section are disposed at an angle with respect to each other.Type: ApplicationFiled: June 27, 2008Publication date: January 1, 2009Applicant: Robert Bosch GmbHInventor: Matthias Stitz
-
Patent number: 7468647Abstract: A solenoid includes a stator core, a plunger, a ring core, and a magnetic circuit component. The stator core has a fixed axial end and a free axial end. The free axial end is unfixed. The stator core is formed of a magnetic material. The plunger is slidable along an inner surface of the stator core. The plunger is formed of a magnetic material. The ring core surrounds an outer surface of the free axial end of the stator core. The ring core is formed of a magnetic material. The magnetic circuit component is adjacent to the stator core. The magnetic circuit component conducts magnetic flux with the stator core. The ring core radially conducts radial magnetic flux with the stator core. The ring core axially conducts axial magnetic flux with the magnetic circuit component.Type: GrantFiled: April 28, 2006Date of Patent: December 23, 2008Assignee: Denso CorporationInventors: Ryo Ishibashi, Hiroo Tsujimoto, Motoyoshi Ando
-
Patent number: 7441746Abstract: An injection valve includes a housing that movably accommodates a needle. A movable core is axially movable together with the needle in the housing. A stationary core is fixed in the housing for forming a magnetic circuit together with the movable core. At least one of the movable core and the stationary core has an end that has an annular first protrusion protruding toward an end of an other of the movable core and the stationary core. At least one of the movable core and the stationary core has an end that has an annular second protrusion protruding toward an end of an other of the movable core and the stationary core. The first protrusion is substantially coaxial with respect to the second protrusion.Type: GrantFiled: January 16, 2007Date of Patent: October 28, 2008Assignee: Denso CorporationInventor: Kouichi Sugiyama
-
Patent number: 7423506Abstract: An annular magnet is formed by coupling a plurality of arc-shaped divided magnets with each other in an annular shape as well as such being magnetized with N and S magnetic poles on the end surfaces thereof in an axial direction, wherein the annular magnet is formed such that each of the divided magnets has joint portions at both ends thereof so that the divided magnets are joined to each other. Each of the joint portions also has a joint surface to overlap the joint portions of adjacent divided magnets in the axial direction. The joint surface is magnetized to a magnetic pole different from that of a joint surface to which such is joined, and the divided magnets are coupled with each other by the magnetic attraction force of different magnet poles.Type: GrantFiled: July 7, 2006Date of Patent: September 9, 2008Assignee: SMC CorporationInventor: Atsushi Terasaki
-
Patent number: 7405640Abstract: Certain exemplary embodiments comprise an apparatus, comprising: a circuit breaker comprising: an integral thermo-magnetic trip device adapted to trip said circuit breaker upon an occurrence of a current overload and adapted to trip said circuit breaker upon an occurrence of a voltage spike of at least a predetermined level; and an integral electronic trip device adapted to trip said circuit breaker upon detection of a ground fault and adapted to trip said circuit breaker upon detection of an arc fault, said integral electronic trip device comprising a solenoid adapted to actuate upon at least one of said ground fault and said arc fault, said solenoid comprising a plunger, said plunger comprising a plunger tip located at an end of said plunger and defined about a longitudinal axis of said solenoid, said plunger tip adapted to contact and move a biased armature.Type: GrantFiled: March 2, 2005Date of Patent: July 29, 2008Assignee: Siemens Energy & Automation, Inc.Inventor: Brian Timothy McCoy
-
Publication number: 20080157905Abstract: A first aspect of the invention includes a power relay assembly having a motor assembly and actuator assembly disposed in a housing. The actuator assembly includes at least one bridge assembly having one or more contacts arranged to provide selective electrical connections. The actuator assembly is attached to an armature of the motor assembly. The armature is arranged and disposed to drive the actuator assembly. The motor assembly includes an electromagnetic coil assembly disposed around at least a portion of the armature. A magnetic pole piece is configured adjacent to an end of the coil assembly. The pole piece includes an armature seat configured to attract and receive the armature when the coil assembly is magnetized. The armature seat has a taper configured to provide a substantially constant attractive force along the stroke length.Type: ApplicationFiled: December 27, 2006Publication date: July 3, 2008Applicant: TYCO ELECTRONICS CORPORATIONInventors: David Parker, Kurt T. Zarbock
-
Patent number: 7375606Abstract: The metal housing of the case of a contactor includes an annular rib extending continuously opposite the cylindrical periphery of the main stationary core, the rib having an internal diameter respectively greater than that of the ferrule and smaller than that of the housing, so as to ensure the locking of the different parts of the case and the crimping of the housing on the stationary magnet following local deformations exerted on the reduced diameter of the swaged part defining the rib.Type: GrantFiled: March 26, 2004Date of Patent: May 20, 2008Assignee: Valeo Equipements Electriques MoteurInventors: Frédéric Talon, Pierre Magnier, Christophe Gruet
-
Patent number: 7350763Abstract: A linear solenoid includes a pole tube; a housing jacket that encloses the pole tube; a coil that encompasses the pole tube; and a displaceable armature that is received in the pole tube. An overlap range between the housing jacket and an axially displaceable component that is in operative connection with the pole tube adjusts in order to adjust a magnetic force. The component is adapted to be actuated from outside in a mounted condition of the linear solenoid. The pole tube guides the component axially and the component has an external thread engaged with an internal thread of the housing jacket.Type: GrantFiled: July 7, 2005Date of Patent: April 1, 2008Assignee: Bosch Rexroth AGInventor: Klaus Höfling
-
Patent number: 7315230Abstract: Embodiments of the present invention provide solenoid plungers, solenoid actuators, and solenoid-actuated mechanisms, that provide for an adjustable stroke, adjustable rated force, and adjustable plunger extension that overcome the problems and issues associated with non-adjustable solenoid actuators. In accordance with an embodiment of the present invention, an adjustable solenoid plunger is provided that comprises a stem and an armature including an axial armature bore. The stem engages the armature bore and is adapted for advancement of the armature along at least a portion of the stem.Type: GrantFiled: August 19, 2004Date of Patent: January 1, 2008Assignee: The Hoffman Group, LLCInventor: Lawrence Andrew Hoffman
-
Publication number: 20070290581Abstract: A solenoid (10) includes a shell (12), a lower stator member (20) associated with the shell, and an upper stator member (30) in the shell. The upper stator member is separate from the lower stator member and has a wire receiving member (34). A half bobbin (40) is associated with the upper stator member and has a wire receiving portion (44). Wire is wound directly about the portion of the half bobbin and directly about the member of the upper stator member to define a winding (46). An armature (54) is movable with respect to at least the lower stator member upon energizing the winding.Type: ApplicationFiled: June 1, 2007Publication date: December 20, 2007Applicant: Siemens Canada LimitedInventors: Keith Burnett, Bernard J. Hrytzak, Alfred J. Whitman
-
Patent number: 7280021Abstract: A linear solenoid is provided which works to pull a plunger to a stator magnetically. The plunger and the stator are aligned to have ends opposed to each other. The end of the stator has formed therein a recess into which the end of the plunger is insertable. The recess has an inward magnetic attraction surface formed on a peripheral edge. The plunger has an outward magnetic attraction surface formed on an outer peripheral edge of the end thereof which faces the inward magnetic attraction surface through a magnetic gap. The inward and outward magnetic attraction surfaces have greater areas defining the magnetic gap, thereby ensuring a greater amount of magnetic attraction pulling the plunger to the stator upon energization of a coil. The recess may alternatively be formed in the end of the plunger.Type: GrantFiled: July 25, 2005Date of Patent: October 9, 2007Assignee: Denso CorporationInventor: Kanehisa Nagasaki
-
Patent number: 7266883Abstract: The invention discloses methods for the production of pressure pipes of a tractive solenoid for a hydraulic valve and pressure pipes that are manufactured using these methods, wherein the pressure pipes are thermally joined.Type: GrantFiled: February 7, 2003Date of Patent: September 11, 2007Assignee: Bosch Rexroth AGInventors: Roland Schempp, Uwe Baerenwaldt, Hermann Sanzenbacher
-
Publication number: 20070200655Abstract: An electromagnetic actuator includes a cylindrical coil, a stator core disposed in the cylindrical coil, a plate attached to one axial end of the stator core and an armature positioned to face the other axial end of the stator core. Upon energizing the coil, the armature is attracted to the stator core against a biasing force of a spring disposed in an inner space of the stator core. A depressed portion is formed on the plate and/or the stator core to suppress a magnetic flux passing therethrough and to reduce an amount of leakage flux. The magnetic flux generated by the coil is effectively used to drive the armature, and thereby a response time of the actuator is shortened. In other words, the armature is quickly driven upon energizing the coil.Type: ApplicationFiled: December 5, 2006Publication date: August 30, 2007Applicant: DENSO CORPORATIONInventors: Fumiaki Murakami, Shigeru Nonoyama, Naoki Mitsumata
-
Patent number: 7249749Abstract: A solenoid valve capable of handling a corrosive control fluid and developing an increased attraction force. The solenoid valve 1 is adapted such that a fixed core is located in a wound coil 29 and protruding through the lower surface of the coil, a plunger 16 holding a valve sheet 17 is supported by a plate spring 18 under the fixed core, the valve sheet 17 is normally retained in contact with a valve seat 13 by spring force of the plate spring 18, and the valve sheet 17 is separated from the valve seat against the spring force of the plate spring 18 when the coil 29 is energized.Type: GrantFiled: November 9, 2004Date of Patent: July 31, 2007Assignee: CKD CorporationInventors: Tsuneo Niwa, Masayuki Watanabe, Yukio Ozawa, Shigenobu Nishida, Yasunori Nishimura, Akiko Kosaka
-
Patent number: 7243680Abstract: The invention relates to a hydraulic valve (1), which comprises an electromagnet (2) with a magnet armature (3) as well as the valve part (4) with at least two valve seats (5, 6). The electromagnet (2) is formed by a hollow-cylindrical plastic coil former (8), a coil winding (10) which is accommodated in the latter and a magnet housing (11) which encloses the coil winding (10), the hollow cylinder of the coil former (8) being formed as an armature space (14) of the magnet armature (3), into which an upper magnet pole (15) and a lower magnet pole (16) protrude. The valve part (4) is formed by a hollow-cylindrical valve housing (18), which has a pressure connection (P) at the end as well as a consumer connection (A) and a tank connection (T), respectively arranged in its lateral surface (19), in the hollow cylinder of which housing two cup-shaped deep-drawn parts (23, 24) with the valve seats (5, 6) are pressed.Type: GrantFiled: June 16, 2006Date of Patent: July 17, 2007Assignee: Schaeffler KGInventors: Eduard Golovatai-Schmidt, Michael Kraemer
-
Patent number: 7227440Abstract: An electromagnetic actuator comprises an driven member and magnetostrictive elements which change the dimensions thereof when activated or deactivated by selectively applying magnetic flux therein. The driven member is moved in a selected direction when the appropriate elements are activated and deactivated in a controlled manner.Type: GrantFiled: March 3, 2005Date of Patent: June 5, 2007Assignee: Pratt & Whitney Canada Corp.Inventor: Kevin Allan Dooley
-
Patent number: 7209020Abstract: A variable force solenoid is described, wherein the solenoid has a relatively long stroke and a relatively low profile. The solenoid includes an armature with at least one tapered surface and a pole piece with at least one tapered surface. The armature and the pole piece may each be provided with multiple tapers on more than one surface thereof.Type: GrantFiled: June 8, 2004Date of Patent: April 24, 2007Assignee: BorgWarner Inc.Inventor: Robert J. Telep
-
Patent number: 7095304Abstract: According to a solenoid air valve, a flange portion of a moving core and a flange portion area of a bobbin implement a stop area defining a distance of travel of the moving core in a direction away from a fixed core. An end portion of a shaft portion of the moving core can project outward through an opening of a frame cover, so that a gap between a surface of the frame cover facing the shaft portion and a side surface of the shaft portion (distance: L2) can be minimized. Consequently, a solenoid air valve having a structure allowing improvement in magnetic efficiency by making smaller the gap between the frame and the moving core is provided.Type: GrantFiled: July 8, 2005Date of Patent: August 22, 2006Assignee: Omron Healthcare Co., Ltd.Inventors: Yoshihiko Sano, Yasutaro Miyatani, Hisatomi Matsuda, Hiroshi Kishimoto, Hiromichi Karo, Ryoichi Fukui
-
Patent number: 7091808Abstract: A solenoid that has a small body and increased propulsion in a controlled range is provided. The solenoid is characterized by being provided with a bearing 40 formed of a nonmagnetic body, n (where n is a positive integer of zero or above) grooves 56 and n+1 tooth parts 58 that are adjacent to the grooves 56 and function as magnetic poles being provided in a facing surface 52 of a first upper yoke 54a, m (where m is a positive integer of zero or above) grooves 70 and m+1 tooth parts 72, 74 that are adjacent to the grooves 70 and function as magnetic poles being provided in a facing surface 55 of a second upper yoke 54b, n+1 grooves 56 and n+1 tooth parts 58, 59 that are adjacent to the grooves 56 and function as magnetic poles being provided in a surface 52 of the slider 36 that faces the first upper yoke 54a, and m grooves 76 and m tooth parts 78 that are adjacent to the grooves 76 and function as magnetic poles being provided in a surface 55 of the slider 36 that faces the second upper yoke 54b.Type: GrantFiled: October 20, 2003Date of Patent: August 15, 2006Assignee: Shinano Kenshi Kabushiki KaishaInventor: Masashi Okubo
-
Patent number: 7059453Abstract: An electromagnetic brake interposed between a fixed housing and a rotating member. The electromagnetic brake includes a multiplate brake mechanism, a ringlike core member fixed through an annular brake guide inside the fixed housing, an exciting coil accommodated in an annular groove formed on the core member, and a ringlike armature member arranged radially outside of the core member. Each of the core member and the armature member has a plurality of tapering surfaces. The tapering surfaces of the core member are respectively complementary in shape to the tapering surfaces of the armature member. The electromagnetic brake further includes a cylindrical pressure member movable in a direction of pressing the multiplate brake mechanism. The cylindrical pressure member has one end fixed to the armature member and another end engaged with the multiplate brake mechanism.Type: GrantFiled: June 26, 2003Date of Patent: June 13, 2006Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Yoichiro Yamamoto, Katsuhiro Kitamura, Rikiya Kunii, Keiichi Ooiso, Kenji Honda, Akihiro Iwazaki
-
Patent number: 7049917Abstract: A moving core of a solenoid air valve has a flange portion arranged on a side of a fixed core, provided in a radially projecting manner and having a first diameter, and a shaft portion having a second diameter smaller than the first diameter. Therefore, a sufficient area of magnetic pole is ensured around a rubber packing in the flange portion of the moving core. Consequently, the solenoid air valve structured such that an area of magnetic pole is sufficiently ensured even if the moving core is made thinner in order to ensure a volume of a coil body in reducing the solenoid air valve in size can be provided.Type: GrantFiled: July 8, 2005Date of Patent: May 23, 2006Assignee: Omron Healthcare Co., Ltd.Inventors: Yoshihiko Sano, Yasutaro Miyatani, Hisatomi Matsuda, Hiroshi Kishimoto, Hiromichi Karo, Ryoichi Fukui
-
Patent number: 7044438Abstract: An electromagnetic actuator for actuating a gas-reversing valve on a piston internal combustion engine includes two electromagnets. Each electromagnet includes a one yoke body presenting a pole face. The pole faces of the two electromagnets face each other at a distance. Each yoke body has two parallel grooves that are open toward the pole face and form a coil window with a coil disposed in the coil window. An armature is arranged to move back and forth between the pole faces counter to the force of at least one restoring spring. The two electromagnets each have a different load profile.Type: GrantFiled: April 19, 2004Date of Patent: May 16, 2006Assignee: FEV Motorentechnik GmbHInventors: Günter Feyerl, Hans Kemper, Christian Boie, Lukas Wagener
-
Patent number: 7028978Abstract: A proportional solenoid-driven valve control assembly comprised of a moveable, magnetic armature adjacent to a fixed magnetic pole piece, providing fluid leakage containment, and having no non-magnetic element for alignment, support, or magnetic flux path control. A valve unit coupled with the armature contains a fluid cavity in fluid communication with a fluid inlet port and a fluid exit port. The valve is closed by a poppet coupled to the armature. To compensate for fluid pressures exerted against the poppet, a flow restriction is provided between an armature cavity and the fluid cavity. In addition, a bore is formed through the armature to provide fluid communication between the fluid exit port and the armature cavity. This serves to balance fluid pressures at the fluid inlet and exit ports applied to the opposite sides of the fluid flow restriction.Type: GrantFiled: February 25, 2002Date of Patent: April 18, 2006Inventor: Viraraghavan S. Kumar
-
Patent number: 6980072Abstract: A linear actuator has inner yokes, outer yokes forming gaps between themselves and the inner yokes, and a movable body provided with planar magnets in the gaps. Eight pieces each of the inner yokes and the outer yokes are arranged at equal angular intervals in a circumferential direction with planar faces of each of the inner yokes and the of the outer yokes being opposed to each other. The movable body has magnet retaining portions having a substantially triangular shape and placed between adjacent inner yokes and between adjacent outer yokes. A linear actuator having high magnetism usability can be structured using magnetic parts suitable for mass production.Type: GrantFiled: June 17, 2003Date of Patent: December 27, 2005Assignees: Nidec Sankyo Corporation, Sharp Kabushiki KaishaInventors: Yukinobu Yumita, Shohzoh Tanaka, Kazuhiko Ueda
-
Patent number: 6959732Abstract: At least one solenoid actuator and a valve are at least partially positioned within a body of an hydraulic device. The solenoid actuator includes at least one solenoid coil mounted to a stator that defines a guide bore in which a push pin moves between a first position and a second position. The valve includes a valve member that is operably coupled to move with the push pin. The push pin is attached to an armature that is positioned adjacent the solenoid coil. In order to increase the durability of the solenoid actuator, a relatively hard, nonmagnetic material is positioned between an inner surface of the stator that is made from a relatively soft, magnetic material and an outer surface of the push pin.Type: GrantFiled: February 21, 2003Date of Patent: November 1, 2005Assignee: Caterpillar Inc.Inventors: Clifford E. Cotton III, Alan R. Stockner, Ronald D. Shinogle, Olaf Ohligschläger
-
Patent number: 6956454Abstract: Magnetic subassembly for electrical breaker apparatus, comprising a magnetic yoke (10), a fixed core (39) and a moveable core (30) sliding along an axis (X) inside an insulating sheath (20) under the action of an induction coil (25) arranged around the sheath (20). The moveable coil (30) possesses a radial annulus (33) separating a first part (31) and a second part (32) of different radial section, the magnetic yoke (10) comprises a radial face (11) perpendicular to the axis (X) with an opening (19) centred on the axis (X) and traversed by the first part (31) of the moveable core (30). The opening (19) comprises a fluted perimeter composed of a plurality (N) of teeth (17) directed towards the axis (X), hollow zones (15) situated between each tooth (17) accommodating an end of the insulating sheath (20).Type: GrantFiled: March 29, 2005Date of Patent: October 18, 2005Assignee: Schneider Electric Industries SASInventors: José Garcia, Patrick Larcher, Arnaud Rivals
-
Patent number: 6929242Abstract: A solenoid having increased axial force and low static friction on the armature is disclosed and provides an improved solenoid-driven hydraulic valve actuator. The solenoid includes a coil member, a pole piece having an inside surface with recessed and non-recessed portions to form an inner recess in the pole piece, an armature inside the pole piece, and a bearing held in the recess between the pole piece and armature, the bearing having an inner surface extending inwardly just beyond the inside surface of the pole piece non-recessed portion.Type: GrantFiled: February 11, 2003Date of Patent: August 16, 2005Assignee: Thomas Magnete GmbHInventors: Bernhard Kirsch, Manfred Muschalle
-
Patent number: 6922124Abstract: An electromagnetic drive device for lineally reciprocatilvely moving an operating member like a spool of a spool valve is reduced in the manufacturing cost without being degraded in its operational performance. In the electromagnetic drive device, a stator body is excited by an electromagnetic coil to axially move a plunger guided in an inner bore of the stator body, against the resilient force of a spring. The stator body is constituted by arranging a plurality of core portion annular plate elements made of a magnetic material, a plurality of yoke portion annular plate elements made of a magnetic material and a plurality of non-magnetic portion annular plate elements made of a non-magnetic material and placed between the core portion annular plate elements and the yoke portion annular plate elements and by piling up and bodily joining these annular plate elements in axial alignment with one another.Type: GrantFiled: February 20, 2004Date of Patent: July 26, 2005Assignee: Toyoda Koki Kabushiki KaishaInventors: Masaya Segi, Mikio Suzuki, Koichi Takanishi, Masaru Suzuki, Yoshinori Kaneda
-
Patent number: 6856222Abstract: A solenoid includes first and second armatures disposed on either side of a solenoid core. The core includes first and second sets of legs disposed on opposite sides of a central member. A drive circuit provides a first current level to cause flux to flow in a first path through the core and thereby move the first armature without substantially moving the second armature. The drive circuit can provide a second current level greater than the first current level to saturate the first path and thereby redirect flux into a second core path to move the second armature.Type: GrantFiled: August 31, 2001Date of Patent: February 15, 2005Assignee: Caterpillar Inc.Inventor: Glen F Forck
-
Patent number: 6853276Abstract: An electromagnetically actuable device includes a base. A magnetic core is fixedly mounted to the base. An armature is movably mounted to the base proximate the magnetic core. A coil is fixedly mounted to the base and is selectively energized to draw the armature to the magnetic core. The armature and magnetic core have mating surfaces adapted to provide three contact areas in a triangular configuration to provide minimal magnetic air gap and a stable interface when the coil is energized.Type: GrantFiled: September 20, 2001Date of Patent: February 8, 2005Inventor: Richard G. Smith
-
Patent number: 6800983Abstract: Opposing concave structures formed in an end portion 22b of a stator yoke 22 and an end portion 23b of a magnetic core 23 are mated in a staggered manner and are joined. An upper projecting portion 22b-1 of the stator yoke 22 is fitted in a recessed portion formed on a lower projecting portion 23b-2 of the magnetic core 23, and the lower projecting portion 23b-2 of the magnetic core 23 is fitted in a recessed portion formed under the upper projecting portion 22b-1 of the stator yoke 22. In this state, the stator yoke 22 and the magnetic core 23 are fixedly fastened by a joint screw 24 and a tube 26. This structure makes it possible to reduce magnetic resistance in a magnetic circuit structure and to improve power-generating efficiency of a power-generating device using the structure.Type: GrantFiled: October 6, 2000Date of Patent: October 5, 2004Assignee: Seiko Epson CorporationInventors: Yoshitaka Iijima, Kinya Matsuzawa
-
Patent number: 6778051Abstract: An electromagnetic valve has: a coil unit including a bobbin around which a coil winding is wound, the bobbin having a central hole; a pipe body in which a fixed core is press-fitted and welded; and a valve operating unit with the pipe body inserted in the central hole of the bobbin at an one end thereof, a valve of the valve operating unit being opened or closed when the coil unit is energized, wherein, in an inserted portion of the pipe body opposed to the central hole of the bobbin, a welding portion in which a fixed core is welded is formed in a thin-wall sectional shape reduced only an outer diameter thereof, and a difference in the outer diameter between the welding portion and the inserted portion serves to absorb the swelling of a bead due to the welding.Type: GrantFiled: September 5, 2003Date of Patent: August 17, 2004Assignee: Nissin Kogyo., Ltd.Inventors: Takaomi Shirase, Naoki Masuda
-
Patent number: 6768406Abstract: The apparatus for controlling valves that move linearly along respective axes comprises a number of actuators that is equal to the number of valves. Each actuator has an armature (22) of ferromagnetic material fixed to a valve push rod (24) and movable in a housing (16) of the actuator by a coil mounted on a ferromagnetic circuit. The ferromagnetic circuits of the two actuators allocated to two valves of the same type for a single cylinder are contained in the same housing.Type: GrantFiled: October 5, 2001Date of Patent: July 27, 2004Assignee: Johnson Controls Automotive ElectronicsInventor: Calogero Fiaccabrino
-
Patent number: 6763789Abstract: A system and method for increasing force density of a valve actuator particularly suited for use in actuation of intake and/or exhaust valves of an internal combustion engine include at least one electromagnet having a coil wound about a core, and an armature fixed to an armature shaft extending axially through the coil and the core, and axially movable relative thereto. The actuator includes a flux generator, such as at least one permanent magnet positioned between the coil and the armature, oriented so that magnetic flux of the generator travels in a direction opposite to magnetic flux produced by the coil through the core during coil energization to reduce saturation of the core, but in the same direction as the magnetic flux produced by the coil through the armature, to increase an attractive force between the armature and the electromagnet, resulting in an actuator with an increased force density.Type: GrantFiled: April 1, 2003Date of Patent: July 20, 2004Assignee: Ford Global Technologies, LLCInventors: Feng Liang, Michael W. Degner
-
Patent number: 6759934Abstract: 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 pull-back effect of axial flux vectors on the trailing face.Type: GrantFiled: December 5, 2001Date of Patent: July 6, 2004Assignee: Delphi Technologies, Inc.Inventors: Raul A. Bircann, Melissa Bargmann, Dwight O. Palmer
-
Patent number: 6739843Abstract: A control valve has a valve body for opening and closing a valve hole and a solenoid mechanism for urging the valve body by energizing a solenoid. The solenoid mechanism includes a yoke, a plunger housing, a fixed core and a plunger. The yoke accommodates the solenoid and forms a magnetic path. The plunger housing made of stainless steel connects with the yoke, and has a central axis. The fixed core connects with the yoke. The plunger is accommodated in the plunger housing and connects with the valve body. The plunger is attracted to the fixed core to move in the direction of the central axis by applying electromagnetic force from the solenoid. Black oxide treatment is performed to the yoke after the plunger housing is brazed to the yoke.Type: GrantFiled: July 3, 2002Date of Patent: May 25, 2004Assignee: Kabushiki Kaisha Toyota JidoshokkiInventors: Satoshi Umemura, Kazuhiko Minami, Tatsuya Hirose, Masami Niwa, Yuji Hashimoto, Masaki Ota
-
Patent number: 6737946Abstract: A solenoid with improved pull-in and landing characteristics. As a solenoid armature closes toward contact with the pole faces of a yoke, a geometric redistribution of a constant total flux causes the force to increase with decreasing gap. Latching force at saturation is maximized when the latching contact area matches the tightest bottleneck in the flux path. The addition of ferromagnetic area not making latching contact preserves the maximum latching force, increases power efficiency for pulling at a distance, and increases the flux redistribution effect of increasing force with decreasing gap at constant flux. The extra constant-flux force change at small gaps may be abrupt, for a high deceleration followed by a quick passive force increase to latch with low impact, or gradual, for tight servo control and very low impact. Conductive material can provide selective inductive damping near latching. Armature mass can be kept low despite the extra ferromagnetic area.Type: GrantFiled: February 21, 2001Date of Patent: May 18, 2004Inventors: Joseph B. Seale, Gary E. Bergstrom
-
Patent number: 6731043Abstract: A spin-roll formed one-piece field core shell formed from a blank disc of sheet metal. The one-piece field core has an outer annular ring integral to and encircling a center axis of the disc and extending from a bottom external surface in a direction that is perpendicular to the bottom surface of the disc and parallel to the center axis of the disc. The core has an inner annular ring integral to and encircling a center axis of the disc, the inner annular axis is spaced radially inward from the outer annular ring and extends from the bottom external surface in a direction that is perpendicular to the bottom surface of the disc and parallel to the center axis of the disc. The one-piece field core also contains a mounting flange that encircles a center axis of the disc and extends in a perpendicular direction to a top external surface of the disc and parallel to the center axis of the disc.Type: GrantFiled: October 22, 2001Date of Patent: May 4, 2004Assignee: A. J. Rose Manufacturing Co.Inventors: Robert D. Pritchard, Michael Hamulak, Randy Monahan
-
Patent number: 6731191Abstract: A DC electromagnet system used in an electrical switchgear, for example in a contactor having a driving coil, includes a fixed, C-shaped magnet yoke and a movable, rod-shaped armature. The yoke has a central web and two legs. The armature is guided in its displacement stroke by guide devices, the free end of the armature being directed toward the central web of the magnet yoke. There is a single working air gap between the free end of the armature and the center of the central web, perpendicular to the longitudinal axis of the armature. The ends of the yoke legs extend to the proximity of the armature and are separated from the armature, each forming a parasitic air gap.Type: GrantFiled: April 4, 2003Date of Patent: May 4, 2004Assignee: Moeller GmbHInventors: Volker Lang, Rudolf Scholz
-
Patent number: 6674353Abstract: The magnet system is part of a relay, which displays particularly low-noise switching. Components of the magnet system include a core unit (1), an armature (6) and a not represented coil, whereby the armature (6) is preloaded in an open position. The low-noise switching behavior is achieved in that the armature (6) is designed in such a manner that the armature pole face in the region of its front end (8a) in the closing direction is essentially perpendicular to a connecting line (16) towards the bearing edge (12). In addition, when the armature (6) is attracted, the core pole face (9) extends at least substantially parallel to the armature pole face (8). The arrangement according to the invention requires no additional parts for the purpose of noise reduction, resulting in a particularly simple and compact structure.Type: GrantFiled: June 17, 2002Date of Patent: January 6, 2004Assignee: Tyco Electronics Logistics AGInventors: Martin Hanke, Ralf Hoffmann, Josef Kern, Karsten Pietsch
-
Patent number: 6642825Abstract: An iron core comprising an outer yoke, side poles disposed on both end portions of the outer yoke, and a center pole disposed between the side poles, wherein a magnetic path of polar portions of the center pole is formed as an open-circuit. There can be restricted for short-circuiting of magnetic flux of permanent magnets and thrust of an oscillator disposed at an air gap formed between electromagnets can be improved.Type: GrantFiled: September 9, 2002Date of Patent: November 4, 2003Assignee: Techno Takatsuki Co., Ltd.Inventor: Ikuo Ohya
-
Publication number: 20030189183Abstract: The method according to the present invention for manufacturing a magnet coil for a valve is characterized in that first a metal base element (2) of the valve is made available, then an electrically insulating winding support (50) is mounted on the outer wall of the base element (2), and lastly a winding (4) of the magnet coil (1) is introduced into the winding support (50).Type: ApplicationFiled: February 24, 1999Publication date: October 9, 2003Inventors: KLAUS NOLLER, DIETER MAIER
-
Patent number: 6628186Abstract: A proportional activation magnet (1) for a hydraulic solenoid valve has a pole (3) with a valve cone receiving bore (17) for receiving a valve cone (20) and a pole tube (14) for receiving an armature (30). An armature tappet (33) extends between the armature (30) and valve cone (20). A retention area (35) with a tappet passage opening (36) is provided around the armature tappet (33) in a region between the valve cone receiving bore (17) and pole tube (14). An annular gap with a predefined gap width is formed between the inside of the tappet passage opening (36) and the outside of the armature tappet (33) which extends in the tappet passage opening (36).Type: GrantFiled: August 3, 2001Date of Patent: September 30, 2003Assignee: Bosch Rexroth AGInventor: Hans Wölfges
-
Patent number: 6611186Abstract: A electrical solenoid suitable for fluid controls applications with an elastomeric retaining device of an elastomeric material arranged between the housing and the lamination stack. The elastomeric retaining device eliminates the need for potting compound and the associated steps of filling the housing with potting and curing the potting compound. The solenoid has a wire coil wound about the lamination stack in which the wire coil has an electrical connection extending through the housing for electrical communication with an external electrical control. The end of the lamination stack projects out of the housing slightly after manufacturing and assembly. When the solenoid is mounted, the elastomeric retaining device biases the lamination stack against the mounting surface. The wire coil is pre-assembled in a wire coil assembly comprising a bobbin, a wire coil wound about the bobbin and a plastic overmold encapsulating the wire coil and bonded to the bobbin.Type: GrantFiled: February 26, 2001Date of Patent: August 26, 2003Assignee: Woodward Governor CompanyInventors: Kent R. Hanson, Jon S. Pointer, Henri A. Siedow, Allan W. Larson, Jeffrey E. McBride
-
Proportional solenoid-controlled fluid valve assembly without non-magnetic alignment support element
Patent number: 6604726Abstract: A proportional solenoid-driven valve control assembly contains a moveable, magnetic armature positioned adjacent to one end of a fixed magnetic pole piece. The magnetic pole piece has a longitudinal axial pole piece portion, and a relatively thin, annular axial pole piece portion, that rapidly saturates, and is effectively mechanically solid with the longitudinal pole piece portion for fluid leakage containment. A radial portion is solid with the annular axial portion and provides support and alignment for the armature relative to the magnetic pole piece, without the need for non-magnetic material for alignment, support or magnetic flux flow path control.Type: GrantFiled: July 13, 2001Date of Patent: August 12, 2003Assignee: Teknocraft, Inc.Inventor: Viraraghavan S. Kumar -
Patent number: 6601822Abstract: In a magnetic driving device, a fixed core has a housing portion, in which a plunger is housed to reciprocatingly move, and an attracting portion toward which the plunger is attracted upon energizing a coil. The housing portion is provided with a ring portion, which is formed by machining an outer circumference wall thereof and whose thickness is thinner than that of a part of the housing portion adjacent to the ring portion to an extent that mechanical strength of the housing portion is not damaged. The ring portion is provided with a plurality of through-holes penetrating radially the wall thereof. A magnetic flux area of the ring portion is limited due to the thin wall and the through-holes so that magnetic resistance is enlarged.Type: GrantFiled: March 7, 2001Date of Patent: August 5, 2003Assignee: Denso CorporationInventors: Seiji Tachibana, Hiroyuki Nakane, Mitsuhiro Watanabe, Naoya Suda, Yoshitaka Kamiya