Patents by Inventor Eric Allegri
Eric Allegri has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10018257Abstract: A roller screw mechanism comprises a screw having an outer thread and a nut disposed around and coaxially with the screw. The nut comprises an inner thread. A plurality of rollers are disposed radially between the screw and the nut; each roller being provided with an outer thread engaged with the outer and inner threads of the screw and of the nut and with two outer gear teeth. The mechanism also comprises two synchronizing gear teeth that are each engaged with one of the gear teeth of the rollers. An outside diameter of each gear teeth of each roller is less than a diameter of a root of the thread of the roller. Each tooth of the gear teeth of the rollers comprises planar faces that engage with the synchronizing gear teeth.Type: GrantFiled: September 25, 2015Date of Patent: July 10, 2018Assignee: AKTIEBOLAGET SKFInventors: Folly Abevi, Eric Allegri
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Patent number: 9517518Abstract: A method of manufacturing a nut in a screw and nut system comprises a first material removal stage to form an internal thread of which the value of the nominal diameter is lower than a predetermined final nominal diameter value and a second plastic deformation stage of the thread formed during the first stage to obtain the predetermined final value by material displacement.Type: GrantFiled: October 30, 2013Date of Patent: December 13, 2016Assignee: AKTIEBOLAGET SKFInventors: Eric Allegri, Gilles Pajean
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Publication number: 20160091067Abstract: A roller screw mechanism comprises a screw having an outer thread and a nut disposed around and coaxially with the screw. The nut comprises an inner thread. A plurality of rollers are disposed radially between the screw and the nut; each roller being provided with an outer thread engaged with the outer and inner threads of the screw and of the nut and with two outer gear teeth. The mechanism also comprises two synchronizing gear teeth that are each engaged with one of the gear teeth of the rollers. An outside diameter of each gear teeth of each roller is less than a diameter of a root of the thread of the roller. Each tooth of the gear teeth of the rollers comprises planar faces that engage with the synchronizing gear teeth.Type: ApplicationFiled: September 25, 2015Publication date: March 31, 2016Applicant: AKTIEBOLAGET SKFInventors: Folly ABEVI, Eric ALLEGRI
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Patent number: 9267587Abstract: A roller screw mechanism provided with a screw having an external thread, a nut surrounding and coaxial with the screw, the nut including an internal thread, two gear wheels mounted in a non-threaded part of the nut, each gear wheel providing a first set of teeth having a plurality of internal teeth, and a plurality of rollers radially located between the screw and the nut, each roller having an external thread designed to engage the external and internal threads of the screw and the nut, and axially at each end a first set of teeth having a plurality of gear teeth designed to engage with the internal gear teeth of the gear wheels. The outer diameter of the gear teeth of each roller is less or equal to the diameter of the thread root of the external thread of the roller.Type: GrantFiled: March 25, 2014Date of Patent: February 23, 2016Assignee: AKTIEBOLAGET SKFInventors: Folly Abevi, Eric Allegri
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Publication number: 20150300467Abstract: A roller screw mechanism including a screw provided with an outer thread, a nut surrounding and coaxial with the screw, the nut being provided with an inner thread, a plurality of rollers radially disposed between the screw and the nut and each provided with an outer thread and with two outer gear teeth two gear wheels each provided with gear teeth meshing with the gear teeth of the rollers, and two spacer rings for maintaining the rollers circumferentially spaced apart. The spacer rings are axially offset towards the inside relative to the gear teeth of the gear wheels.Type: ApplicationFiled: April 21, 2014Publication date: October 22, 2015Applicant: Aktiebolaget SKFInventors: Eric ALLEGRI, Folly Abevi
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Publication number: 20150276030Abstract: A roller screw mechanism provided with a screw having an external thread, a nut surrounding and coaxial with the screw, the nut including an internal thread, two gear wheels mounted in a non-threaded part of the nut, each gear wheel providing a first set of teeth having a plurality of internal teeth, and a plurality of rollers radially located between the screw and the nut, each roller having an external thread designed to engage the external and internal threads of the screw and the nut, and axially at each end a first set of teeth having a plurality of gear teeth designed to engage with the internal gear teeth of the gear wheels. The outer diameter of the gear teeth of each roller is less or equal to the diameter of the thread root of the external thread of the roller.Type: ApplicationFiled: March 25, 2014Publication date: October 1, 2015Applicant: Aktiebolaget SKFInventors: Folly Abevi, Eric Allegri
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Patent number: 8984979Abstract: Ball screw assembly comprising a screw (2) provided with an outer thread (3); a nut (4) provided with an inner thread (5); a series (6) of balls (7) able to circulate along a circulating path (10) between the screw and the nut, along which the balls are engaged in the threads thereof; and recirculating means (8) defining a recirculating channel (9) to carry balls from one end to the other end of said circulating path (10); The recirculating channel (9) comprising a return channel (14) provided on the nut and, between the ends of this return channel and the corresponding ends of said circulating path, deflecting channels (27, 28) which are defined respectively between surfaces (25) of deflecting elements (20, 21) engaged in respective holes (11, 12) of the nut (4) and local zones (26) of surfaces (16) of these respective holes.Type: GrantFiled: April 17, 2012Date of Patent: March 24, 2015Assignee: Aktiebolaget SKFInventors: Eric Allegri, Christophe Durand, Jerome Dubus, Romuald Lescorail
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METHOD OF MANUFACTURING THE THREAD OF A NUT IN A SCREW AND NUT SYSTEM AND ASSOCIATED DEFORMATION TAP
Publication number: 20140135135Abstract: A method of manufacturing a nut in a screw and nut system comprises a first material removal stage to form an internal thread of which the value of the nominal diameter is lower than a predetermined final nominal diameter value and a second plastic deformation stage of the thread formed during the first stage to obtain the predetermined final value by material displacement.Type: ApplicationFiled: October 30, 2013Publication date: May 15, 2014Applicant: Aktiebolaget SKFInventors: Eric Allegri, Gilles Pajean -
Publication number: 20130068052Abstract: The ball screw system comprises a screw having an external threading, a nut having an internal threading and a series of balls being engaged in said threadings to link the screw and the nut, the nut comprising ball recirculation means comprising at least one ball deflection element inserted into a through hole of the wall of the nut, from outside to inside as far as abutment means, in which the nut is equipped with a retaining ring which bears on a peripheral wall of this nut, over at least a part of its length, and which bears permanently against the bottom of at least one groove formed on an external face of said deflection element and in which the retaining ring is engaged.Type: ApplicationFiled: September 20, 2012Publication date: March 21, 2013Applicant: AKTIEBOLAGET SKFInventor: Eric ALLEGRI
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Publication number: 20130068058Abstract: Ball screw system comprising a screw having an external threading, a nut having an internal threading and a series of balls being engaged in the threadings to link the screw and the nut, the nut comprising ball recirculation means comprising at least one ball deflection element inserted into a through hole of the wall of the nut, from outside to inside as far as abutment means, in which the nut is equipped with a retaining means which bears on a peripheral wall of this nut, over at least a part of its length, and which bears on an external face of the deflection element, the permanent retaining means being self-held and ensuring that the deflection element is held permanently in the through hole.Type: ApplicationFiled: September 20, 2012Publication date: March 21, 2013Applicant: AKTIEBOLAGET SKFInventors: Eric ALLEGRI, Christophe DURAND
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Publication number: 20120266702Abstract: Ball screw assembly comprising a screw (2) provided with an outer thread (3); a nut (4) provided with an inner thread (5); a series (6) of balls (7) able to circulate along a circulating path (10) between the screw and the nut, along which the balls are engaged in the threads thereof; and recirculating means (8) defining a recirculating channel (9) to carry balls from one end to the other end of said circulating path (10); The recirculating channel (9) comprising a return channel (14) provided on the nut and, between the ends of this return channel and the corresponding ends of said circulating path, deflecting channels (27, 28) which are defined respectively between surfaces (25) of deflecting elements (20, 21) engaged in respective holes (11, 12) of the nut (4) and local zones (26) of surfaces (16) of these respective holes.Type: ApplicationFiled: April 17, 2012Publication date: October 25, 2012Applicant: AKTIEBOLAGET SKFInventors: Eric Allegri, Christophe Durand, Jerome Dubus, Romuald Lescorail