Nsk Corporation

Kioxia Corporation

Toshiba Memory Corporation

Yasuyuki Matsuda

Daisuke Gunji

Kazutaka Tanaka

Masafumi Hikida

Noboru Shibata

Hiroyasu Yoshioka

Takashi Imanishi

Shin Yamamoto

Eiji Inoue

Tetsu Takehara

Tomoharu Saito

Shunsuke Suzuki

Yuya Daikoku

Yuka Kaneko

Ryuho Morita

Hirotaka Kishida

Hiroshi Kawahara

Toshirou Toyoda

Tsutomu Hibi

Shinya Nakatani

Gen Kimura

Mitsuru Oike

Tohru Ueda

Masahiko Yamazaki

Hirotoshi Miyajima

Tooru Ueda

Eisaku Suzuki

Fumiaki Soda

Hiroki Hamada

Yoshiya Mukai

Shuhei Souma

According to one embodiment, a memory system includes a semiconductor memory device including a memory cell capable of holding at least 4-bit data and a controller configured to control a first write operation and a second write operation based on the 4-bit data. The controller includes a conversion circuit configured to convert 4-bit data into 2-bit data. The semiconductor memory device includes a recovery controller configured to recover the 4-bit data based on the converted 2-bit data and data written in the memory cell by the first write operation. The first write operation is executed based on the 4-bit data received from the controller, and the second write operation is executed based on the 4-bit data recovered by the recovery controller.

Semiconductor memory device, memory system, and write method

An electric vehicle drive device includes: a first motor; a second motor; a transmission mechanism coupled to the first motor and the second motor; and a control unit configured to control operation of the first motor and the second motor based on a drive signal. The transmission mechanism includes: a sun gear shaft coupled to the first motor; a first planetary gear mechanism; a second planetary gear mechanism; and a one-way clutch configured to restrict a rotation direction of a first carrier to a predetermined positive rotation direction. The drive signal includes gear change information indicating a first state in which the second motor is controlled based on torque or a second state in which the second motor is controlled based on rotation speed, and throttle information indicating an acceleration of rotation speed of a wheel.

Electric vehicle drive device

A vehicle weight measurement device includes a diaphragm which covers an opening area of a groove portion of a mounting part to form an oil chamber of a predetermined space together with the groove portion; a pressure sensor which detects a change in pressure of measurement fluid in the oil chamber; a first piston which presses the diaphragm; a second piston which presses the first piston; and a bearing unit interposed between the second piston and a spring bush which receives one end of a spring of a suspension device and is relatively rotatable. The bearing unit includes a thrust needle bearing which swingably supports a load in a longitudinal direction of the suspension device, and a slide bush which does not receive a load in the longitudinal direction and receives a load in a radial direction while causing constant damping to swinging.

Vehicle weight measurement device

An electric vehicle driving device includes a first motor, a second motor, a transmission device to which power of at least one of the first motor and the second motor is transmitted, and an output member that rotates with power output from the transmission device. A rotation axis of the first motor, a rotation axis of the second motor, and a rotation axis of the transmission device are arranged in parallel to a rotation axis of the output member. When seen from an axial direction parallel to the rotation axis of the output member, the rotation axis of the first motor is located on one side of a straight line passing through the rotation axis of the output member and the rotation axis of the transmission device and the rotation axis of the second motor is located on the other side of the straight line.

Electric vehicle driving device

An extension-retraction link includes: a stationary shaft having a tubular shape; a first universal joint that connects the stationary shaft to a vehicle body side member; a movable shaft that can slide with respect to the stationary shaft; a second universal joint that connects the movable shaft to a hub carrier; and an actuator that moves the movable shaft. The movable shaft includes: a first plane surface; a second plane surface making an angle with respect to the first plane surface; a third plane surface opposite the first plane surface; and a fourth plane surface opposite the second plane surface. The stationary shaft includes: first to fourth bushes in contact with the first to fourth plane surfaces, respectively; a first elastic member pressing the third bush to the third plane surface; and a second elastic member pressing the fourth bush to the fourth plane surface.

Extension-retraction link and suspension

An electric vehicle drive device includes: a first motor; a second motor, and a transmission mechanism coupled to the first motor and the second motor and capable of switching a reduction ratio. The transmission mechanism includes a sun gear shaft coupled to the first motor. The first motor includes: a first stator core, a first rotor core disposed radially outward of the first stator core, and a first rotor holding member that couples the first rotor core and the sun gear shaft.

A rotation transmission device having a high torque measurement resolution is provided. The rotation transmission device is provided with: a rotary-shaft unit () having a first and second rotary shaft () combined so as to be coaxial and such that the end sections thereof can rotate relative to each other and a torsion bar () that is provided on the inner-diameter side of the first and second rotary shafts so as to be coaxial therewith, has one end section connected to the first rotary shaft (), and has the other end section connected to the second rotary shaft (); a first gear () fastened to the outer peripheral surface of the first rotary shaft (); a second gear () fastened to the outer peripheral surface of the second rotary shaft (); a coupling shaft () provided on the inner-diameter side of the torsion bar () so as to be coaxial therewith, having one end section connected to one rotary shaft (), and having the other end section protruding from an end of the torsion bar () in the axial direction; a first encoder disposed and fixed on the other end of the coupling shaft () so as to be coaxial with the first rotary shaft () and having a first detected section (); a second encoder fastened on the other end of the second rotary shaft () so as to be close to the first encoder and having a second detected section (); and a sensor unit having at least one sensor () that faces the first and second detected sections ().

Rotation transmission device

A vehicle wheel supporting rolling bearing unit includes a stationary side bearing ring member, a rotation side bearing ring member, and plural rolling elements. The rotation side bearing ring member is provided with a first acceleration sensor, a second acceleration sensor, and a third acceleration sensor which are fixed on a virtual plane orthogonal to a center axis of the rotation side bearing ring member. The first acceleration sensor and the second acceleration sensor are arranged on a virtual line passing through a rotation center of the rotation side bearing ring member with a same distance from the rotation center while detection directions thereof are directed in a radial direction and are opposite to each other in the radial direction. The third acceleration sensor is arranged such that a detection direction thereof is non-parallel to the detection directions of the first acceleration sensor and the second acceleration sensor.

Vehicle wheel supporting rolling bearing unit

A sun roller of a friction roller-type transmission includes a movable sun roller element () capable of moving in an axial direction. Furthermore, the sun roller is provided with a loading cam mechanism which is formed along the circumferential direction of an input shaft (), the loading cam mechanism having a first cam surface (), a second cam surface () arranged facing the first cam surface () and secured to the input shaft (), rolling elements () held between the first and second cam surfaces (), and an annular holding device (), and the loading cam mechanism axially displacing the movable sun roller element (). The holding device () has an inside-diameter-surface guiding part () for positioning the holding device relative to the input shaft by being fitted over the input shaft, the guiding part being provided to the inside diameter surface.

Friction roller-type transmission

A friction roller type reduction gear includes a first sun roller so mounted on an input shaft movably in the axial direction of the input shaft, a plurality of first cam grooves formed in the end face of the first sun roller, a cam plate so mounted on the input shaft as is opposed to the first cam groove side of the first sun roller, a plurality of second cam grooves so formed in the cam plate as are opposed to the first cam grooves, rolling elements interposed between the first and second cam grooves, and a cage for holding the rolling elements rollably, while a pitch circle diameter of the position for holding the rolling elements is different from pitch circle diameter of the first and second cam grooves.

Friction roller type reduction gear

In order to implement a structure capable of improving the resolution of torque measurement while preventing the plastic deformation of a torsion bar (), an input-side stopper () having an uneven shape (gear shape) in the circumferential direction is provided in a portion of an input-side rotating body () that includes an input shaft () and an input gear (), and an output-side stopper () having an uneven shape (gear shape) in the circumferential direction is provided in a portion of an output-side rotating body () that includes an output shaft () and an output gear (). The input-side stopper () and the output-side stopper () are combined so as to be engaged to be able to transmit torque only when the torsional angle within the elastic range of the torsion bar () reaches a predetermined amount.

Torque measurement device-equipped rotation transmission apparatus

Construction of a friction roller reducer is achieved wherein displacement of intermediate rollers due to the change in thickness in the axial direction of loading cam apparatuses can be performed smoothly, and excellent transmission efficiency can be obtained. Long guide holes that are long in the radial direction of a sun roller and ring-shaped roller are provided in guide blocks that are fastened to a support frame for supporting the end sections of rotation shafts of intermediate rollers. The outer rings of ball bearings, of which the inner rings are fitted around and fastened to the outside of the end sections of the rotation shafts, engage with the long guide holes so as to be able to displace in the radial direction of the sun roller and the ring-shaped roller.

Growing community of inventors

Kanagawa, Japan

Yasuyuki Matsuda