Abstract: A vehicle weight measurement device includes a moving body, an attachment body, a stopper ring provided between the moving body and the attachment body, and a rotation prevention part configured to prevent the moving body and the attachment body from rotating relative to each other. The stopper ring includes a fixing part fixed to one of the moving body and the attachment body and a separation and detachment prevention part provided at the other of the moving body and the attachment body and configured to prevent the moving body and the attachment body from separating and detaching, without inhibiting movement of the moving body. The rotation prevention part includes a pin fitted from the moving body to the attachment body.

Abstract: The vehicle weight measurement device includes a bottom plate in contact with an arm of a suspension device, a piston which presses a diaphragm configuring an oil chamber on an upper surface side of the bottom plate, and a pressure sensor which detects pressure of a measurement fluid in the oil chamber on an lower surface side of the bottom plate. The bottom plate includes a rotation-preventing mechanism with respect to the arm of the suspension device around the pressure sensor. A hanging circumferential edge portion is formed in a flange portion of the piston. A gap is interposed between the flange portion and the bottom plate. A protruding portion of the piston engaged in a cutout of a stopper ring and a protruding portion protruding to an upper surface side and engaged to the cutout so as to be movable in a longitudinal direction are provided.

Abstract: A universal joint includes: a housing; an arm, part of which is located inside the housing; an external bush that is located between an inner circumferential surface of the housing and the arm; an internal bush that is located on the opposite side of the external bush with the arm being interposed therebetween; and a supporting member that supports the internal bush. The arm includes: an arm convex surface that is a spherical convex surface; and an arm concave surface that is a spherical concave surface. The external bush includes a bush concave surface that is a spherical concave surface in contact with the arm convex surface. The internal bush includes a bush convex surface that is a spherical convex surface in contact with the arm concave surface.

Abstract: 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.

Abstract: 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.

Abstract: An electric vehicle drive apparatus includes a first motor, a second motor, a speed change mechanism coupled to the first motor and the second motor, and a controller controlling operation of the first motor and the second motor. The speed change mechanism includes a first planetary gear mechanism, a second planetary gear mechanism, and a one-way clutch that limits a rotation direction of a first carrier of the first planetary gear mechanism to a certain forward rotation direction. When rotating the first motor in a backward rotation direction opposite to the certain forward rotation direction and rotating the second motor in the forward rotation direction, the controller determines rotation speeds of the first motor and the second motor within a range indicated by Expression (1).

Abstract: An extension-retraction link includes: a stationary shaft having a tubular shape; a movable shaft that can slide with respect to the stationary shaft; and an actuator that has a bearing unit supporting a screw shaft and moves the movable shaft. The stationary shaft includes: first to fourth bushes in contact with first to fourth plane surfaces of the movable shaft, 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. The bearing unit includes: a bearing in contact with the screw shaft; a bearing holder that fits in a mounting groove provided to the stationary shaft and holds the bearing; and a third elastic member located between a bottom surface of the mounting groove and the bearing holder.

Abstract: An electric vehicle driving device includes a first motor that includes a first rotor, a first stator, and a first coil, a second motor that includes a second rotor, a second stator, and a second coil, and a transmission device to which power of at least one of the first motor and the second motor is transmitted. A plane passing through a first end portion located on the endmost side in an axial direction among an end portion of the first rotor in the axial direction, an end portion of the first stator in the axial direction, and an end portion of the first coil in the axial direction and being orthogonal to the rotation axis is a first plane.

Abstract: A rotation transmission device having a high torque measurement resolution is provided.

Abstract: 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.

Abstract: A weight measuring device includes: a bottom plate (200) in contact with an arm of a suspension; a piston (300) capable of pressing a diaphragm (230) forming an oil chamber (201) on an upper surface side of the bottom plate; a pressure sensor (400) for detecting a pressure of measurement fluid (R) in the oil chamber on a lower surface side of the bottom plate; an oil discharge hole portion (240) which communicates an inner side of the oil chamber with the atmosphere side and is capable of discharging excess hydraulic oil in the oil chamber; and a sealing portion (242) which is provided in the oil discharge hole portion and seals the oil discharge hole portion after discharging the excess measurement fluid (R) and equilibrating an internal pressure to the atmospheric pressure in a state of no load.

Abstract: 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.

Abstract: A vehicle weight measurement device includes an annular diaphragm (11) configured to cover an opening area (9d) of a groove portion (9c) of a mounting part (7) and to form a predetermined oil chamber (9) together with the groove portion. The diaphragm (11) is hermetically fixed by an inner collar (33) and an outer collar (35). The diaphragm (11) is pressed by a piston (43) configured to be moveable by a resilient force of a spring of a suspension device, and a pressure of a fluid to be measured R filled in the oil chamber, which is to be applied by the movement of the piston, can change. A pressure sensor (21) configured to communicate with the oil chamber and to detect a change in pressure of the fluid to be measured R filled in the oil chamber is provided.

Abstract: 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.

Abstract: A sun roller of a friction roller-type transmission includes a movable sun roller element (23) 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 (12), the loading cam mechanism having a first cam surface (75), a second cam surface (77) arranged facing the first cam surface (75) and secured to the input shaft (12), rolling elements (63) held between the first and second cam surfaces (75, 77), and an annular holding device (51), and the loading cam mechanism axially displacing the movable sun roller element (23). The holding device (51) has an inside-diameter-surface guiding part (81) 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.

Abstract: A first motor includes a first member to be detected configured to rotate together with a first rotor core. A first rotation angle detector is coupled to the partition wall and faces the first member to be detected. A second motor includes a second member to be detected configured to rotate together with a second rotor core. A second rotation angle detector is coupled to the partition wall and facing the second member to be detected. A transmission mechanism is capable of switching a deceleration ratio. When seen from a direction of the rotation axis, a first line passing a root of the first signal line on a side of the first rotation angle detector and the rotation axis is overlapped with a second line passing a root of the second signal line on a side of the second rotation angle detector and the rotation axis.

Abstract: An internal gear configuring a reduction gear is supported and fixed to a rotation side flange provided on an axially outer end portion of a hub, and the hub is rotationally driven based on a driving force input through the internal gear. Accordingly, since a drive shaft for rotationally driving the hub is not necessarily connected to a center hole of the hub, an electric generator and a wireless communication device can be disposed in an accommodating space having a large space provided on an axially inner side of the hub.

Abstract: 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.

Abstract: A vehicle wheel supporting rolling bearing unit includes a bearing part having a stationary side bearing ring member which is supported and fixed to a suspension device and non-rotatable in a use state and a rotation side bearing ring member which is coupled and fixed to a vehicle wheel and rotate together with the vehicle wheel, an electric generator which generates electric power to be supplied to a sensor provided on the vehicle wheel, a battery which stores the electric power generated by the electric generator, and a wireless communication device which wirelessly communicates an output signal of the sensor with an electronic equipment arranged on a vehicle body side. The stator is supported and fixed to the stationary side bearing ring member, and the rotor, the battery and the wireless communication device are supported and fixed to the rotation side bearing ring member.

Abstract: 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.