Aktiebolaget Skf

Skf Engineering and Research Centre B.v.

Transrol

Aktiebolaget 3kf

Ewellix Ab

Christian Boch

Jerome Dubus

Folly Abevi

Jérôme Dubus

Hendrikus Jan Kapaan

Clair Druet

Thomas Wilhelm Fucks

Jiri Gurka

Alberto Visconti

J&eacute;r&ocirc;me Dubus

Asbjorn Bundgart

Jacobus Zwarts

Parveen K Chandila

Albert Van Den Kommer

Gerard Buvril

Sebastien Lecluse

Frans Grove

Georges Claret

Peter K Hayward

Bernard Guetaz

Marcus Hong Yeow Lee

Jérome Dubus

The roller screw mechanism provides a screw having an outer thread, a nut surrounding and coaxial with the screw, the nut including an inner thread, and a plurality of rollers radially disposed between the screw and the nut and cooperating with the outer and inner threads. Magnets for attracting metal particles are disposed inside the roller screw mechanism.

Roller screw mechanism with magnetized means

A planetary roller screw mechanism includes a screw shaft provided with at least one external thread, a nut provided with at least three internal threads and at least three rollers arranged, radially with respect to a central axis of the screw shaft, between the screw shaft and the nut. Each roller is provided with at least two external threads. The number of external threads of the screw shaft is a multiple of the number of external threads of a roller. The number of internal threads of the nut is a multiple of the number of external threads of a roller.

Planetary roller screw mechanism

An actuating device having a longitudinal shaft, an internal sleeve, an external sleeve, internal screw connecting means provided between the longitudinal shaft and the intermediate sleeve, external screw connecting means provided between the intermediate sleeve and the external sleeve. The direct efficiency of the internal screw connecting means is higher than the direct efficiency of the external screw connecting means. The self-releasable coupling means are provided between the longitudinal shaft and the internal sleeve.

Actuating device with double screw connecting means

A valve actuated device for a valve having a valve body and a valve translating member; a housing; a rotary and non-translating sleeve mounted in the housing and connected to an input rotary means; an axial shaft means positioned coaxially to the sleeve and adapted to be connected to the valve translating member; screw connecting means provided between the axial shaft means and the sleeve for convert applied rotation of the sleeve into axial translation of the axial shaft means; anti-rotation and axial guidance means installed between the housing and the shaft means; the anti-rotation and axial guidance means providing a linear ball bearing including a sleeve mounted to the housing and at least one rolling element recirculation system, the rolling elements thereof engaging axial groove of the shaft means.

Valve actuating device with anti-rotation and axial guidance means

The valve operator assembly is provided for a valve and includes a housing, an input member rotatably mounted, and a transmission mechanism including a translating element and a rotating element connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further includes at least one locking mechanism radially interposed between the transmission mechanism and the housing, and provided with friction means in radial contact with the housing, and with at least one pre-stressing element acting on said friction means to maintain said radial contact. The pre-stressing element and the friction means cooperate together to lock the transmission mechanism with the housing in a static position of said assembly.

Valve operator assembly with friction means and pre-stressing element

A roller screw mechanism comprising a screw having an outer thread, a nut disposed around and coaxially with the screw. The nut includes an inner thread. A plurality of rollers are disposed radially between the screw and the nut and are each 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 additionally comprises two synchronizing gear teeth that are formed on the nut and are each engaged with one of the gear teeth of the rollers. The root diameter of each gear teeth is less than the inside diameter of the inner thread of the nut.

Roller screw mechanism with integrated ring gears and associated manufacturing method

A valve operator assembly for a valve includes a valve body and an axially moveable valve translating member, a housing mounted on the valve, an input member rotatably mounted with respect to the housing, and a transmission mechanism. The transmission mechanism including a translating element connected to the valve translating member and a rotating element connected to the input member. The transmission mechanism configured to convert applied rotation of the input member into axial translation of the translating element. The valve operator assembly providing a spacing element having a tubular shape defining an axial bore through which passes the valve translating member and the translating element of the transmission mechanism. The spacing element connected by intermediate fixing means on the valve body on one end and on the housing on the other end to define cooperating mounting surfaces between the spacing element.

Valve operator assembly and valve equipped with such assembly

A roller screw mechanism comprising a screw, provided with an outer thread, a nut positioned around and coaxially to the screw, the nut being provided with an inner thread, and a plurality of rollers inserted between the screw and the nut, each comprising an outer thread engaged with the outer thread of the screw and with the inner thread of the nut. Each of the threads of the screw, rollers and nut comprise first and second axially opposite flanks, respectively forming a first and second angle with a plane perpendicular to the central axis of the screw, the first and second flanks of each thread of the rollers respectively being in contact with the first and second flanks of the nut's thread and with the first and second flanks of the screw's thread. The value of the first angle is different from the value of the second angle.

Roller screw mechanism

The valve operator assembly is provided includes a housing, an input member rotatably mounted, and a transmission mechanism including a translating element and a rotating element connected to the input member, said transmission mechanism being adapted to convert applied rotation of the input member into axial translation of said translating element. The assembly further includes a locking mechanism provided with a casing mounted on the transmission mechanism and/or the housing, with a freewheel including a plurality of locking members mounted in radial contact with the transmission mechanism and with the casing, and with friction means axially disposed between the casing and the housing and mounted in axial contact with said housing. The friction means, the freewheel and the casing cooperate together to lock the transmission mechanism with the housing in a static position of said assembly.

Valve operator assembly with freewheel and axial friction means

A valve operator assembly is adapted for use with a valve. The assembly comprises a housing, an input member rotatably mounted with respect to the housing and comprising a rotational drive input, and a transmission mechanism connected to the input member and comprising a stem, the transmission mechanism being adapted to convert applied rotation of the rotational drive input into axial translation of the stem. The assembly further comprises at least one elastic actuator axially located between the input member and the stem to obtain a compression of the actuator during an axial translation of the stem towards the input member and a release of the actuator during an axial translation in the opposite direction.

Valve operator assembly with compensating actuator

The system comprises a roller screw mechanismwhich is provided with a screwwhich comprises at least a first outer threaded portion, a nutand a plurality of rollerswhich cooperate with the first outer portionand an inner thread of the nut. The system further comprises a roller thrust bearingwhich is mounted on a second outer portionof the screw and which is provided with a bushingand a plurality of rollerswhich comprise flanks which cooperate with flanks of the second outer portionof the screw and the bushing. The flanks of the screw, the bushing and the rollers are configured so that, during a rotation of the screw, the rollersare fixed axially relative to the screwand relative to the bushing

System comprising a roller screw and a roller thrust bearing

A bearing lubricating housing () comprising a lubricating housing body (). The bearing housing () is designed to retain a rolling element bearing assembly () while providing axial motion when the housing () is assembled within an interior of a guiding tube (). The bearing housing () includes a series of channels () and/or passageways () forming a lubrication matrix for collecting a lubricant from an interior surface () of the guiding tube () to the rolling element bearing assembly ().

Self lubricating robust centralizer bearing design and method of use

Actuating device comprising a longitudinal shaft (), an intermediate tailstock spindle (), an outside sleeve (), internal thread means () making it possible to connect the longitudinal shaft and the intermediate tailstock spindle to generate an axial movement of one with respect to the other, external thread means () making it possible to couple the intermediate tailstock spindle and the outside sleeve and suitable for generating an axial movement of one with respect to the other, the said internal coupling means comprising internal roller elements () engaged on the one hand with the external and internal threads of the intermediate tailstock spindle and/or the said external coupling means comprising external roller elements () engaged on the one hand with the external thread of the intermediate tailstock spindle and the internal thread of the outside sleeve and comprising coupling means making it possible to couple the shaft and the intermediate tailstock spindle or the intermediate tailstock spindle and the internal thread of the outside sleeve selectively while rotating.

Actuating device with intermediate rolling elements

A screw actuator comprises a nut and a screw each comprising helical grooves, said nut and screw engaging each other by rollers or balls which are in contact with said grooves, a lubricant being provided for the grooves and rollers or balls. Integrated in the actuator is a module, which is connected to at least the helical grooves of the nut and/or screw for replenishing the lubricant for the grooves and rollers or balls of the actuator.

Screw actuator with lubricant dosing, and brake calliper

A screw actuator comprises a screw ( ) and a nut ( ) which are each provided with at least a helical groove ( ), and a series of rollers or balls ( ) which are in rolling contact with the grooves ( ). A sleeve ( ) is provided which surrounds the nut ( ) at least partly. The sleeve ( ) may carry a seal ( ) which acts between the nut ( ) and screw ( ); e.g. a wiper seal. The seal ( ) may be fixedly connected to the nut ( ), and frictionally engage the screw ( ).

Growing community of inventors

Chambery, France

Christian Boch