Kuwana, Japan
Kuwana, Japan

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Patent
Ntn Corporation | Date: 2016-11-18

Provided is an electric brake device that is able to achieve redundancy when an abnormality occurs in a load sensor, without increasing the size of the load sensor. The electric brake device includes a brake rotor, a friction pad, an electric motor, a transmission mechanism, braking force command section, braking force estimation section, motor rotation angle detector, and a controller. The braking force estimation section includes a load sensor configured to detect elastic deformation of a determined member forming the electric brake device. The controller includes sensor abnormality detector configured to store a sensor output of the load sensor at a motor rotation angle at which a braking force becomes zero, and infer the occurrence of plastic deformation in the load sensor from transition of the stored sensor output.


Traction control unit interposed between torque allocation unit and torque control unit for left and right wheels and each configured to inhibit a slip of the drive wheel during acceleration or deceleration are provided. A longitudinal force estimation unit for estimating longitudinal forces acting on the respective left and right wheels and longitudinal force coincidence control unit are provided. The longitudinal force coincidence control unit compares absolute values of the longitudinal forces on the left and right wheels estimated by the longitudinal force estimation unit, and provides a driving torque command that generates a longitudinal force equal to the longitudinal force whose absolute value is smaller, to the torque control unit for the drive wheel at which the absolute value is larger.


Patent
Ntn Corporation | Date: 2016-11-03

A brake controller is provided with a positive efficiency operation limiter configured to provide a time for maintaining or decreasing a torque to be generated by a motor, such that a braking force generated by pressing between a brake rotor and friction pads does not decrease, while a braking force command value outputted from a braking force command section increases. For example, the limiter limits a ratio of a time for increasing the braking force, relative to a sum of the time for increasing the braking force and the time for maintaining or decreasing the braking force, to a predetermined value or less.


Patent
Ntn Corporation | Date: 2016-10-18

Provided is a brake device that is able to achieve an improvement in versatility of the device, and which is able to reduce an uncomfortable feeling and annoyance caused by an operating noise of a parking brake. This brake device includes: left and right parking brake mechanisms configured to independently apply braking forces to left and right wheels of a vehicle, respectively, and hold the vehicle stationary; and a control device configured to control these parking brake mechanisms. The control device includes a parking brake actuation determiner configured to adjust respective timings at which the left and right parking brake mechanisms are actuated so as to reduce an uncomfortable feeling caused to an occupant of the vehicle.


Patent
NTN Corporation | Date: 2016-09-28

A rolling bearing includes rolling elements incorporated between an outer race and an inner race, a resin seal ring covering the opening of at least one end of the bearing space, and a filter covering an oil hole formed in the seal ring for capturing foreign matter contained in lubricating oil. The filter and the resin seal ring are integrated by insert molding. The filter and the seal ring are made of the same material. An annular lip portion, which is separate from the seal ring, is in contact with the outer race. An engaged portion provided on the radially inner side of the seal ring is engaged in a recess formed in the inner race such that, during thermal expansion of the seal ring, the engaged portion is engaged such that the seal ring is movable in the radial direction relative to the inner race.


Patent
Ntn Corporation | Date: 2016-11-03

A bearing device has rolling bearings each having an inner ring mounted on a main shaft and an outer ring; an inner ring spacer interposed between the inner rings of the neighboring rolling bearings and mounted on the main shaft; an outer ring spacer interposed between the outer rings of the neighboring rolling bearings; and a cooling structure. The cooling structure includes a nozzle provided in the outer ring spacer to supply a cooling fluid to the rolling bearings by blowing the cooling fluid to an outer peripheral surface of the inner ring spacer. The nozzle has a discharge port side that is inclined forwardly with respect to a direction of rotation of the main shaft. The outer peripheral surface of the inner ring spacer is shaped to guide the cooling fluid, discharged from the nozzle, towards the neighboring rolling bearings on both sides.


Patent
NTN Corporation | Date: 2016-09-10

A wheel bearing apparatus has an outer member, an inner member, and double row rolling elements contained between the outer raceway surfaces and inner raceway surfaces of the outer member and the inner member. A cup-shaped steel protective cover is mounted on the inner-side end of the outer member. The cover fitting portion has a cylindrical portion, a radially reduced portion and an elastic member. The elastic member has an annular projection and a contact lip. When the protective cover is fit into the outer member, the annular projection closely contacts with the fitting surface while elastically deforming and the contact lip elastically contacts the inner-side end of the outer member.


Patent
NTN Corporation | Date: 2016-05-18

A slip control device for an electric vehicle which accurately determines slippage occurrence with only a rotation angle sensor for motor rotation control and perform rapid control to eliminate the slippage, is provided. A threshold calculation module (21) calculates a normal angular acceleration of a motor depending on a manipulation amount of an accelerator to obtain a threshold, and an angular acceleration calculator (22) differentiates a detection value from a rotation angle sensor (3a) twice to calculate an angular acceleration. A slip determination (23) determines whether a drive wheel (7) has slipped, and a torque limitation (25) limits a torque when a slippage has occurred. The determination (23) determines the angular acceleration and a threshold. The determination (23) counts a number of consecutive times it is determined that the threshold is exceeded, and determines that a slippage has occurred, if the number of consecutive times has reached a set value. The limitation (25) limits a torque developed by a motor unit for a drive wheel laterally opposite to the drive wheel determined as having slipped.


Patent
NTN Corporation | Date: 2016-09-14

Six track grooves (7) formed in a spherical inner peripheral surface (6) of an outer joint member (2) are each formed into an arc shape having a curvature center at a joint center (O) . The track grooves (7) are inclined in a circumferential direction of the outer joint member (2) with respect to a joint axial line (N-N), and are adjacent to each other in the circumferential direction with their inclination directions opposite to each other. Six track grooves (9) formed in a spherical outer peripheral surface (8) of an inner joint member (3) are formed so as to be mirror-image symmetrical with the track grooves (7) paired therewith of the outer joint member (2) with respect to a joint center plane (P) at an operating angle of 0. An inclination angle () of each of the track grooves (7) of the outer joint member (2) with respect to the joint axial line (N-N) is set to 8 or more and 16 or less.


One object of the present invention is to provide method for controlling bearing clearance of wheel bearing apparatus which can exactly and stably control the bearing clearance. According to the present invention, there is provided method for controlling bearing clearance of wheel bearing apparatus comprising steps of measuring an axial distance T0 and an initial axial clearance 0 between reference surfaces of the hub wheel and the inner ring with temporally stopping press-fitting operation under a positive bearing clearance state during press-fitting the inner ring onto the cylindrical portion of the hub wheel; measuring an axial distance T1 between the reference surfaces of the hub wheel and the inner ring after further continuation and completion of the press-fitting operation and then obtaining an axial clearance 1 under this state from a formula 1=0-(T0-T1), and obtaining an axial distance T2 after the caulking operation between the reference surfaces of the hub wheel and the inner ring from a formula T2=2-1-T1 so that the axial distance T2 becomes a target value of the bearing clearance 2 after the caulking operation and then changing a completion end position of caulking operation of a caulking apparatus.

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