Ntn Corporation

Kyodo Yushi Co., Ltd.

Shinsuke Hirano

Tomomi Ishikawa

Atsushi Ikeda

Takushi Matsuto

Yoshinori Ikeda

Tatsunori Shimizu

Koji Sato

Junichi Imai

Makoto Seki

Yuta Sato

Daisuke Tsutsui

Tatsuji Inoue

Takushi Matsutou

A casingthat accommodates an electric motorand a ball screwas a motion conversion mechanismincludes a first casethat is made of an aluminum alloy and accommodates the electric motorand a second casethat is coupled to the first casein an axial direction in a state of accommodating the ball screw. The electric motoris supported by the second casevia a metal bracketand a screw, and the entire outer surface of at least one of the metal bracketand the second caseis covered with an insulating film C.

Electric actuator

An electric actuatorincludes a motorand a motion conversion mechanismthat converts a rotary motion generated by driving the motorinto a predetermined motion. A magnetas a sensor target is disposed on a movable part performing a predetermined motion, and magnetic sensorsdetecting position information of the magnetis disposed around the magnet. A magnetic shield plateis disposed between the motorand the magnetic sensors, and an outer surfaceof the motorand an inner surfaceof the magnetic shield plateface each other with a predetermined gaptherebetween.

An electric actuator includes an electric motor, and a motion conversion mechanismconfigured to convert a rotary motion of the electric motorinto a linear motion, in which the motion conversion mechanismhas a nutrotatably supported, and a screw shaftconfigured to axially move in accordance with a rotation of the nut, the electric actuator is provided with a casecovering an axial end surfaceof the screw shaft, and the electric actuator is provided with an elastic memberbetween the axial end surfaceof the screw shaftand an opposite surfaceof the casefacing the axial end surfaceof the screw shaft

An electric actuatorincludes a drive unit, a driving force transmission mechanism, a motion conversion mechanism, an accommodation space accommodating the drive unit, the driving force transmission mechanism, and the motion conversion mechanism, and a ventilation section. The ventilation sectionincludes a ventpenetrating a partition wall partitioning the driving force transmission mechanism, an air flow pathcommunicating with the vent, and a filter

An electric actuator includes: a drive part (); a motion conversion mechanism part () configured to convert a rotary motion from the drive part () to a linear motion in an axial direction parallel with an output shaft () of the drive part (); a driving force transmission part () including a transmission gear mechanism () configured to transmit a driving force from the drive part () to the motion conversion mechanism part (); and a motion-conversion-mechanism support part () including a double-row bearing () configured to support the motion conversion mechanism part (), wherein the double-row bearing () is arranged on one side in the axial direction with respect to the transmission gear mechanism ().

A screw shaftconstitutes a feed screw mechanism provided in an electric actuator. In the screw shafton which a mounting surfacefor mounting a sensor target is formed, a portion where the mounting surfaceis formed has a non-circular, line-symmetric cross section.

Screw shaft, feed screw mechanism, and electric actuator

Provided is an electric actuator, including: a drive part (); a motion conversion mechanism part () configured to convert a rotary motion from the drive part () into a linear motion in an axial direction in parallel to an output shaft of the drive part (); and a lock mechanism part () configured to prevent drive by the motion conversion mechanism part (). The lock mechanism part () includes: a rotary motor (); and a lock member (), which is driven by the rotary motor () so as to be brought into at least any one of a locking state of preventing the drive by the motion conversion mechanism part () and an unlocking state of releasing the locking state.

Provided is an electric actuator including: a drive part (); a motion conversion mechanism part () configured to convert a rotary motion from the drive part () into a linear motion a transmission gear mechanism () configured to transmit a driving force from the drive part () to the motion conversion mechanism part (); and a lock mechanism part () configured to prevent the drive by the motion conversion mechanism part (), wherein the transmission gear mechanism () includes a first gear () arranged on the drive part () side and a second gear () arranged on the motion conversion mechanism part () side, and wherein the lock mechanism part () is arranged on an opposite side of the drive part () with respect to the first gear (), and on the motion conversion mechanism part () side with respect to a rotation center line of the first gear ().

Provided is an electric actuator (), including: a motor (); a motor case () configured to accommodates the motor (); and a motion conversion mechanism () configured to convert a rotary motion generated through drive by the motor () into a linear motion in a direction parallel to an output shaft () of the motor (). The motion conversion mechanism () includes a movable part (, which is arranged in parallel with the output shaft () and is configured to perform the linear motion. The movable part () and the motor () overlap one another in a radial direction of the motor (). A sensor target () is arranged in the moveable part, and a non-contact sensor () configured to detect a position of the sensor target () in a linear motion direction in a non-contact manner is arranged in the motor case ().

Provided is an electric actuator, including: a drive part (); a motion conversion mechanism part () configured to convert a rotary motion from the drive part () into a linear motion in an axial direction parallel with an output shaft of the drive part (); a driving force transmission part () configured to transmit a driving force from the drive part () to the motion conversion mechanism part (); and a motion-conversion-mechanism support part () configured to support the motion conversion mechanism part (), and wherein the drive part () and the motion-conversion-mechanism support part () are capable of being coupled to and decoupled from the driving force transmission part ().

A sensor target of the present invention is mounted to a movable part (), which is arranged in parallel with an output shaft () of a motor (), and is configured to perform a linear motion in a direction parallel to the output shaft (). The sensor target includes a magnet () and a magnet holder () configured to hold the magnet (). One pair or a plurality of pairs of fitting claws () capable of being fitted to an outer peripheral surface of the movable part () are formed on the magnet holder ().

Sensor target, movable-part unit comprising the target, and electric actuator

Provided is a grease composition for a wheel bearing, containing (a) a base oil consisting of a mineral oil and a synthetic hydrocarbon oil, wherein the ratio of the synthetic hydrocarbon oil to the total amount of the mineral oil and the synthetic hydrocarbon oil is 40 to 60 mass %, and the base oil has a kinematic viscosity at 40&#xb0; C. of 40 to 65 mm/s; (b) a thickener of formula (A) wherein Ris diphenylmethane, and Rand R, which may be the same or different from each other, each represent cyclohexyl group or a straight-chain or branched alkyl group having 16 to 20 carbon atoms, with a molar ratio of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group being 50 to 90 mol %; (c) an amine type antioxidant; and (d) an amine phosphate type antiwear agent. 

Grease composition and grease-filled wheel bearing

Electrically operated actuator

A wheel bearing apparatus has a double row rolling bearing detachably united with a constant velocity universal joint. The double row rolling bearing has an outer member, an inner member, and double row rolling elements rollably disposed between the double row raceway surfaces of the outer member and inner member. The constant velocity universal joint has an outer joint member, a shoulder portion, and a shaft portion. A female thread is formed on the shaft portion. End faces of the shoulder portion and the caulked portion are formed with face splines, respectively. The face spline of the caulked portion has a portion where a tooth height of a tooth space of a portion radially outside the pitch circle diameter is set lower than that of other portions of the tooth space.

Growing community of inventors

Shizuoka, Japan

Shinsuke Hirano