JTEKT Patente

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A steering system 1 includes an upper jacket 10 that is movable in an axial direction X, a first stopper member 41 fixed to the upper jacket 10, and a second stopper member 42 on a vehicle body. When a lock and unlock mechanism 4 unlocks the upper jacket 10, the second stopper member 42 moves to an advanced position where the second stopper member 42 faces the first stopper member 41 in the axial direction X. When the lock and unlock mechanism 4 locks the upper jacket 10, the second stopper member 42 moves to a retracted position where the second stopper member 42 retracts from the advanced position.

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A manufacturing device for a rotor core 1 includes: a magnetization device 3 that magnetizes magnet raw materials before being magnetized disposed in magnet insertion holes 10 of the rotor core 1 to turn the magnet raw materials before being magnetized into permanent magnets 2; and a detachment device 80 that detaches the rotor core 1 from the magnetization device 3. The detachment device 80 also functions as a mounting device that mounts a jig 7 around the rotor core 1 when the rotor core 1 is detached from the magnetization device 3.

A flexible manufacturing system that makes it possible to give a higher priority to machining of a workpiece that is a super-urgent item is provided. When a pallet (P) to which a workpiece (1A), which is a super-urgent item, is attached is loaded on a loading station (41), a second controller (70) gives a command to a conveyor (50) to convey a pallet (P) to which a workpiece (3C), which is a normal item, is attached and which is located at a standby position (M2) of a pallet changer (20) to a pallet storage room (30). Then, the second controller (70) controls the conveyor (50) to convey the pallet (P) to which the workpiece (1A), which is the super-urgent item, is attached and which is loaded on the loading station (41) to the standby position (M2).

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A ratio of the distance by which a rack shaft (12) moves in a first direction relative to the angle by which a pinion shaft (14) rotates in a circumferential direction is defined as a stroke ratio. The stroke ratio is larger when the pinion (141) meshes with one of a third rack (1215) and a fifth rack (1213) than when the pinion meshes with a first rack (1211). The stroke ratio changes while the pinion moves on one of a second rack (1214) and a fourth rack (1212). A clearance defined between a rack guide (16) and a guide plug (20) is smaller when the pinion meshes with one of the third rack and the fifth rack than when the pinion meshes with the first rack. The clearance defined between the rack guide and the guide plug changes while the pinion moves on one of the second rack and the fourth rack.

A rack guide unit includes a closure member secured to an external opening end of an accommodation portion of a housing, and a rack guide. A compression coil spring and a coned disc spring that urge the rack guide toward a rack shaft are interposed between the closure member and the rack guide. A holding member that holds the coned disc spring includes a guide tube that guides a radially inner portion of the coned disc spring and a seat plate that receives a load from the coned disc spring. An elastic member held in an accommodation groove formed in the outer periphery of the guide tube is frictionally engaged with the inner periphery (opposed portion) of a tubular portion of the rack guide.

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A rotation detection apparatus, a rotation angle detection apparatus, and an electric power steering system are provided which allow appropriate detection of an abnormality in a portion that detects rotation of a rotating shaft. A first arithmetic circuit (51) calculates a rotating direction (D1) and a number of rotations (N1) of the rotating shaft (12a) based on a change in a combination of positivity and negativity of a first electric signal (S1) (first sine signal) and a third electric signal (S3) (first cosine signal). A second arithmetic circuit (52) calculates a rotating direction (D2) and a number of rotations (N2) of the rotating shaft (12a) based on a change in a combination of positivity and negativity of a second electric signal (second sine signal) and a fourth electric signal (second cosine signal). An abnormality determination circuit (53) determines whether each of the first and second arithmetic circuits (51) and (52) is abnormal based on the two rotating directions (D1) and (D2) calculated by the first and second arithmetic circuits (51) and (52), respectively.

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A steering control apparatus is provided which more adequately detects a driver's operating state. A steered-angle command value calculation circuit (54) calculates a steered-angle command value (θt*) by adding a steering torque to a first assist component (Ta1*) that is a sum of a basic assist control amount (Tas*) and compensation components (a hysteresis control amount (Th*) and a damping control amount (Td*)). A steered-angle feedback control circuit (55) calculates a second assist component (Ta2*) by performing angle feedback control based on the steered-angle command value (θt*). A compensation control circuit (52) generates the hysteresis control amount (Th*) and the damping control amount (Td*) based on a determination flag generated by a hand release determination circuit (80) and indicating whether or not the steering state corresponds to a hand release state. The hand release determination circuit (80) determines whether or not the steering state corresponds to the hand release state based on signs of a steering angle (θs) calculated by a steering-angle calculation circuit (70), a steering angular velocity that is a differential value of the steering angle (θs), and a steering angle acceleration.

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There is provided a drive control method for a motor including multiple sets of coils and drive circuits in an electric power steering system. In order to reduce computational load when sensorless control is executed, an electrical angle estimator (110) includes an ±-axis voltage component adder (115) and a ²-axis voltage component adder (116) that add together voltage vectors of a first coil (221) and a second coil (222) expressed in a two-phase fixed coordinate system, an ±-axis current component adder (117) and a ²-axis current component adder (118) that add together current vectors of the first coil (221) and the second coil (222) expressed in a two-phase fixed coordinate system, and an induced voltage computing unit (119) that computes an induced voltage (E) based on an added voltage vector and an added current vector.

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