Nsk Corporation

Sony Corporation

Other

Nippon Seiko Kabushiki Kaisha

Takeshi Takizawa

Shigeru Endo

Ikunori Sakatani

Hiromasa Fukuyama

Kouichi Morita

Tomoyuki Yanagisawa

Yoshio Shoda

Koichiro Ono

Toshio Takahashi

Yasushi Mutoh

Tatsunobu Momono

Satoshi Imai

Toshiro Higuchi

Tatsuo Makii

Mamoru Aoki

Fujio Kanai

Hideo Okamoto

Shinichi Orimo

Takatoshi Uneme

Motoshige Ito

Keishi Iwana

Takeshi Sawamoto

A preload measuring device for a double row rolling bearing unit includes an outer bearing ring member having double rows of outer ring raceways on an inner circumferential surface, an inner bearing ring member having double rows of inner ring raceways on an outer circumferential surface, rolling elements rollably arranged between the outer ring raceways and the inner ring raceways in each of the rows such that contact angles given to the respective rows are opposite to one another, axial displacement measuring means for obtaining an axial relative displacement between the outer bearing ring member and the inner bearing ring member, inclination angle measuring means for obtaining an inclination angle between center axes of the outer bearing ring member and the inner bearing ring member, and preload calculating means for obtaining a preload applied to the rolling elements based on the inclination angle and the axial relative displacement.

Preload measuring device for double row rolling bearing unit

A lens unit includes: a lens barrel; a movable section including a movable lens and configured to be moved in an optical axis direction relative to the lens barrel; a linear actuator including a drive magnet and a drive coil and configured to move the movable section in the optical axis direction by supplying a current to the drive coil; and a pair of biasing blade springs including holding portions for holding the movable section, a plurality of spring portions biasing the movable section in the optical axis direction, and attachment portions to be attached to the lens barrel. One of the biasing blade springs is formed with two spring members through which the current is supplied to the drive coil.

Lens unit and imaging apparatus

The wireless sensor adds identification information peculiar to respective sensor modules to detection data of vibration, temperature, and soon, detected by the sensor modules respectively. The wireless sensor transmits the detection data with the identification information as a signal through a communication unit by radio waves. On the other hand, the management apparatus receiving the signal classifies and files the detection data on the basis of the identification information included in the signal. Then, the monitoring system is designed to make the management apparatus manage a plurality of wireless sensors attached to movable shafts of processing machines or the like.

Wireless sensor, rolling bearing with sensor, management apparatus and monitoring system

A stability control apparatus, includes: a grip detector that changes an output based on a grip force applied in a direction hindering a slippage of a wheel, acting on a contact face between the wheel supported by a wheel supporting rolling bearing unit and the road surface, the wheel supporting rolling bearing unit for supporting freely rotatably the wheel to a vehicle body; and a controller that performs a control for keeping a running stability of the vehicle in response to an input of a detection signal of the grip detector.

Stability control apparatus and load measuring instrument for wheel supporting rolling bearing unit

Revolution speeds n, nof rolling elementsare sensed by a pair of revolution speed sensors. Also, a rotational speed nof a hubis sensed by a rotational speed sensor. A sum 'n+n' or a difference 'n&#x2212;nb' the revolution speeds of rolling elementsin double rows is calculated based on sensed signals of the revolution speed sensors, and then a ratio &#x201c;n+nb/ni&#x201d; or &#x201c;n&#x2212;n/n&#x201d; of this sum or difference to the rotational speed nis calculated. Then, the radial load or the an axial load is calculated based on the ratio &#x201c;n+nb/ni&#x201d; or &#x201c;&#x2212;n/ni&#x201d;.

Load measuring device for rolling bearing unit and load measuring rolling bearing unit

A sensor unit is supported on a stationary ring which does not rotate even when it is in use, and the rotation of the rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, besides the rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby being able to detect the rotation speed and the rotation number of the wheel supported on the rotary ring, and the other car driving conditions.

Wheel rotation detecting device

In a lens driver apparatus using a linear actuator, spaces for installing a driving coil and a driving magnet are reduced to contribute to making the lens driver apparatus smaller. The present invention relates to the lens driver apparatus including a body that is to be driven and to which a lens is attached, a guide axis to guide and allow the body to be driven to move freely in a direction of the optical axis, a driving coil being flat-wound and fitted to the body to be driven, and a driving magnet being disposed opposite side of the driving coil and along a direction of movement of the body to be driven. In the lens driver apparatus according to the present invention, the driving coil and the driving magnet are shaped in curved forms so as to conform to an outer shape of the lens.

Lens driver and image capture apparatus

The wireless sensor adds identification information peculiar to respective sensor modules to detection data of vibration, temperature, and so on, detected by the sensor modules respectively. The wireless sensor transmits the detection data with the identification information as a signal through a communication unit by radio waves. On the other hand, the management apparatus receiving the signal classifies and files the detection data on the basis of the identification information included in the signal. Then, the monitoring system is designed to make the management apparatus manage a plurality of wireless sensors attached to movable shafts of processing machines or the like.

A rolling bearing apparatus with sensor includes a sensor unit retaining a plurality of types of sensors for detecting the status of a rolling bearing, in a single holder. The plurality of types of sensors are at least two types of sensors of a rotation speed sensor, a temperature sensor, and an acceleration sensor.

Sensor and rolling bearing apparatus with sensor

A rolling bearing with sensor includes an inner ring, an outer ring, a plurality of rolling elements disposed between the inner and outer rings, and a sensor having a detecting part detecting a state of the rolling bearing and a circuit part connected to the detecting part. The detecting part and the circuit part are attached to the rolling bearing.

Rolling bearing device and ring with sensor for the rolling bearing device

A wheel rotation detecting device including a sensor unit that is supported on a stationary ring which does not rotate even when the wheel is in use, and the rotation of the wheel that is attached to a rotary ring can be detected by a rotation detecting sensor held within the sensor unit. Within the sensor unit, in addition to a rotation detecting sensor, there are disposed other sensors such as a temperature sensor and a vibration sensor, thereby allowing detection of the rotation speed and the rotation number of the wheel supported on the rotary ring, as well as detection of other car driving conditions.

A magnetic bearing system includes a rotor shaft,, stationary electromagnetic pole, a radial displacement sensor,for detecting the position of the rotor shaft,with respect to the electromagnetic polarity, and a control circuit,which supplies a control current in accordance with an output from the radial displacement sensor,. A permanent magnet,is disposed in the magnetic bearing so as to constitute a portion of a magnetic member,which forms a magnetic circuit between the rotor shaft,and the electromagnetic pole. The position where a balance exists between an attraction force developed in the permanent magnet,and static force, which acts on the rotor shaft,when no load is imposed on the rotor shaft,, is set as a target position for the rotor shaft

Magnetic bearing system

There is disclosed a magnetic bearing which is an improvement over conventional radial magnetic bearings, and has a very small bearing loss. At least three U-shaped laminates 10 of electromagnetic steel sheets are circumferentially arranged around a rotation shaft 1, and are fixedly mounted on a housing 100. Exciting coils 31 and 32 are wound on each electromagnetic steel sheet laminate 10, and permanent magnets 20 and 21 are provided in the laminate 10. Rotor cores 2, each comprising a laminate of I-shaped electromagnetic steel sheets stacked together in the circumferential direction, are mounted on the rotation shaft 1 in such a manner that each rotor core 2 is opposed to magnetic pole surfaces of the electromagnetic steel sheet laminates 10. In accordance with a signal from position sensors 5 which detect the radial position of the rotation shaft 1, control current is caused to flow through the exciting coils 31 and 32 to thereby control the position of the rotation shaft 1. Thus, merely by causing the control current to flow through the exciting coils 31 and 32 when this is required, the control of the rotation shaft 1 can be achieved, and with this method, the energy consumption can be much reduced.

Magnetic bearing

A bearing unit comprising a rotating body, a rotating shaft and a bearing, wherein there is provided a construction with a plurality of electromagnetic poles is arranged, together with a plurality of sensors for detecting the run-out of the rotating shaft, and also comprises a control circuit for controlling the intensity of a magnetic force according to a detection output of these sensors, thereby controlling the bearing unit so that vibration and run-out of the rotating body due to inbalance thereof are effectively suppressed while making the unit to revolve around the principle axis of shape.

Growing community of inventors

Kanagawa, Japan

Takeshi Takizawa