Patents Assigned to NTN Corporation
-
Patent number: 11766890Abstract: An in-wheel motor drive device (10) includes a wheel hub bearing unit (11) having an outer ring (13), an inner ring (12) protruding from the outer ring to one side in an axial (O) direction, rolling elements (14) between the outer ring and the inner ring, and a fixing bolt (15) for fixing the outer ring to a non-rotary member (102); and a brake disk (55) having a connecting portion (58) configured to connect with one end of the inner ring, a cylindrical portion (57) extending from the connecting portion to the other side in the axial direction and disposed coaxially to the inner ring, and at least a part of the fixing bolt is received in an internal space of the cylindrical portion.Type: GrantFiled: January 16, 2018Date of Patent: September 26, 2023Assignee: NTN CORPORATIONInventors: Naoya Takeuchi, Shiro Tamura, Shinya Taikou
-
Patent number: 11767876Abstract: A power transmission shaft includes a metal shaft member, and a resin shaft member connected to the metal shaft member in an axial direction of the power transmission shaft. The resin shaft member is made of fiber reinforced plastic. The metal shaft member and the resin shaft member are joined to each other through a close-contact fitting portion between a male spline, which is formed in an outer surface of the metal shaft member, and a female spline formed by press-fitting the male spline into the resin shaft member. An edge is formed at a radially outer edge portion of a press-fitting-start end surface of the male spline of the metal shaft member.Type: GrantFiled: December 21, 2018Date of Patent: September 26, 2023Assignee: NTN CORPORATIONInventors: Taku Itagaki, Minoru Ishijima
-
Publication number: 20230296132Abstract: A ball bearing is provided which includes a cage circular annular portion and a seal member. The cage circular annular portion has a cage-side sliding contact surface axially opposed to the seal member and configured to come into sliding contact with the seal member. The seal member has a seal-side sliding contact surface configured to come into sliding contact with the cage-side sliding contact surface. A plurality of axial protrusions each having an axially convex circular arc shape in cross sections along a circumferential direction are formed on one of the cage-side sliding contact surface and the seal-side sliding contact surface at constant pitches in the circumferential direction.Type: ApplicationFiled: August 6, 2021Publication date: September 21, 2023Applicant: NTN CORPORATIONInventors: Katsuaki SASAKI, Susumu MIYAIRI
-
Patent number: 11761492Abstract: A boot for a constant velocity universal joint includes large- and small-diameter mounting portions to be mounted to an outer joint member and a shaft, respectively, with boot clamps, a bellows portion integrally coupling the large- and small-diameter mounting portions to each other, and a cylindrical shoulder portion formed at a bellows portion-side end of the large-diameter-side mounting portion, and connected to the bellows portion through two auxiliary crest portions and one auxiliary trough portion between the auxiliary crest portions. A radial distance between each of the auxiliary crest portions and the auxiliary trough portion is shorter than a radial distance between a crest portion and a trough portion. A diameter passing through a center of the radial distance between each of the auxiliary crest portions and the auxiliary trough portion is larger than a diameter of the cylindrical shoulder portion.Type: GrantFiled: March 14, 2018Date of Patent: September 19, 2023Assignee: NTN CORPORATIONInventor: Shingo Yoshinaga
-
Publication number: 20230286178Abstract: An operation device including a combination of a rotation unit and a linear motion unit. The rotation unit includes a link actuation apparatus and a rotation actuator. The link actuation apparatus includes a proximal end side-link hub, and a distal end side-link hub coupled thereto through three or more link mechanisms so as to enable a varying attitude relative thereto. The link actuation apparatus is mounted to an output shaft of the rotation actuator such that a central axis of the proximal end side-link hub forms an angle relative to an axis of rotation of the rotation actuator. The linear motion unit includes a linear actuator serving as an output portion thereof, and the rotation unit is mounted to this linear actuator.Type: ApplicationFiled: May 17, 2023Publication date: September 14, 2023Applicant: NTN CORPORATIONInventors: Hiroshi ISOBE, Jun MIDOUMAE, Masaki KAGAMI
-
Patent number: 11754384Abstract: The present invention addresses the problem of providing a method for measuring axial clearance of a wheel bearing device, with which it is possible to make a high-precision measurement of negative axial clearance. This method comprises: a step (S02) for press-fitting an inner race (4); a first negative axial clearance measurement step (S03); a swaging step (S04); an inner-race press-in amount measurement step (S05); a first inner-race outer-diameter increment measurement step (S06); a second inner-race outer-diameter increment calculation step (S07); an outer-diameter increment difference calculation step (S08); a first axial clearance decrement calculation step (S09); a second axial clearance decrement calculation step (S10); a third axial clearance decrement calculation step (S11); and a second negative axial clearance calculation step (S12).Type: GrantFiled: September 29, 2020Date of Patent: September 12, 2023Assignee: NTN CORPORATIONInventors: Nobukatsu Uchiyama, Satoshi Goto
-
Patent number: 11754121Abstract: A tapered roller bearing is configured such that, when considering: (i) a reference point which is the intersection point between the imaginary line extending from the generatrix of the raceway surface of the inner ring toward a grinding undercut, and the imaginary line extending from the generatrix of a large flange surface toward the grinding undercut; (ii) the undercut width A of the grinding undercut from the reference point to the large flange surface; and (iii) the width RC of a chamfer of each tapered roller in the direction along the generatrix of the large flange surface, the width RC is 0.7 mm or less and the relationship between A and RC is A<RC.Type: GrantFiled: September 14, 2020Date of Patent: September 12, 2023Assignee: NTN CORPORATIONInventor: Takashi Kawai
-
Patent number: 11746825Abstract: A tapered roller bearing is provided has a grinding undercut with an undercut width A of 0.5 mm or less from a reference point to a large flange surface. The reference point is the intersection point of the imaginary line extending from the generatrix of the raceway surface of the inner ring toward the grinding undercut, and the imaginary line extending from the generatrix of the large flange surface toward the grinding undercut.Type: GrantFiled: September 14, 2020Date of Patent: September 5, 2023Assignee: NTN CORPORATIONInventor: Takashi Kawai
-
Publication number: 20230272820Abstract: A bearing device is provided which achieves both creep resistance and electrolytic corrosion resistance. At least one of the radially inner surface of the inner ring and the radially outer surface of the outer ring is covered with a coating layer. The coating layer is a coating layer composite composed of a plurality of layers. Of the plurality of layers, the surface layer is composed of an anti-creep film having lubricity, and at least one layer other than the surface layer is composed of an insulating film having insulating properties.Type: ApplicationFiled: August 26, 2021Publication date: August 31, 2023Applicant: NTN CorporationInventors: Hayato KAWAGUCHI, Toshiki MASUDA
-
Patent number: 11738726Abstract: A vehicle brake system (1) includes a first control device (10) and a second control device (11) that respectively include a master controller (30), a first sub-controller (40), and a second sub-controller (41) that are connected to one another. Each of the master controller (30), the first sub-controller (40), and the second sub-controller (41) includes a braking force calculation unit that calculates braking force of electric brakes (16a to 16d), and a determination unit that compares braking force calculation results of the controllers to determine whether itself is normal. The determination unit includes an output block section that blocks, when the determination unit determines that any one of the controllers is not normal, an output of the controller that is determined to be not normal.Type: GrantFiled: March 29, 2018Date of Patent: August 29, 2023Assignees: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA, NTN CORPORATION, HITACHI ASTEMO UEDA CO., LTD.Inventors: Hiromasa Satoh, Toshihiro Obika, Yusuke Koga, Yasushi Aoki, Hiromitsu Toyota, Haruo Kotera, Tatsuya Yamasaki, Yui Masuda
-
Patent number: 11731693Abstract: Provided are a steering function-equipped hub unit that has a simple structure, high rigidity and a reduced size, a steering system, as well as a vehicle including the steering function-equipped hub unit. The steering function-equipped hub unit includes: a hub unit main body including a hub bearing supporting a wheel; a unit support member provided to a knuckle of a suspension device and rotatably supporting the hub unit main body about a turning axis extending in a vertical direction; and a steering actuator configured to rotationally drive the hub unit main body about the turning axis. The hub unit main body is supported by the unit support member through a preloaded rolling bearing.Type: GrantFiled: September 25, 2020Date of Patent: August 22, 2023Assignee: NTN CORPORATIONInventors: Hirokazu Ooba, Satoshi Utsunomiya, Norio Ishihara, Yusuke Ohata
-
Publication number: 20230256957Abstract: Provided is a vehicle posture control device configured to be installed in a vehicle provided with an actuator configured to generate a roll moment. The device includes a roll moment calculator (24) and an actuator controller (25). The roll moment calculator (24) is configured to calculate a roll moment command value to control the actuator such that a roll motion is generated in conjunction with a yaw motion in the vehicle (1) during turning thereof. The roll moment calculator (24) is configured to calculate the roll moment command value for output, on the basis of a sideslip angular velocity and a vehicle velocity of the vehicle. The actuator controller (25) is configured to control the actuator by using the calculated roll moment command value.Type: ApplicationFiled: April 13, 2023Publication date: August 17, 2023Applicants: NTN CORPORATION, SCHOOL JUDICIAL PERSON IKUTOKU GAKUENInventors: Junichi HIRATA, Makoto YAMAKADO
-
Patent number: 11725733Abstract: To provide a seal ring capable of suppressing wear of a mating housing and preventing protrusion from an annular groove and thereby being superior in low leak performance, which is an original object of the seal ring. A seal ring 1 formed of resin is attached to an annular groove 12 formed on an outer periphery of a butterfly valve 11 having a substantially disc shape so as to seal an annular gap 14 between the butterfly valve 11 and a housing 13 in which the valve is housed. A part of the seal ring 1 is protruded from the annular groove 12, so that the seal ring 1 adheres to the housing 13 to seal the annular gap 14 due to pressure from sealed fluid. A radial direction thickness t of the ring is set in a range of 7-11% of a ring outer diameter in a free state. A ring inner diameter in a state in which the diameter is enlarged due to pressure from the sealed fluid when the valve is opened, is smaller than an outer diameter r of the valve.Type: GrantFiled: March 19, 2019Date of Patent: August 15, 2023Assignee: NTN CORPORATIONInventors: Kohzoh Kakehi, Yuuki Yamazoe
-
Patent number: 11719126Abstract: Each of foils (22) includes: a top foil portion (22a) including a bearing surface (S); and a back foil portion (22b), which is formed on an upstream side of the top foil portion (22a), and is arranged so as to overlap behind the top foil portion (22a) of the adjacent foil (22) (on a side opposite to the bearing surface (S)). An angle (E) covering a radially inner end of an overlapping portion (P) between the adjacent foils (22) is smaller than an angle (D) covering a radially outer end of the overlapping portion (P).Type: GrantFiled: February 26, 2020Date of Patent: August 8, 2023Assignee: NTN CORPORATIONInventors: Kazuyoshi Harada, Masato Yoshino, Miki Okamoto
-
Patent number: 11708854Abstract: A thrust foil bearing 40 having a thrust bearing surface S formed by arranging a plurality of leaves 42 side by side in a circumferential direction, in which each of the leaves 42 has a top foil portion Tf that forms the thrust bearing surface S, and a ratio of a circumferential length A of the top foil portion Tf of one of the leaves 42 at a radially central position of the top foil portion Tf, to a radial length B from an inner diameter-side edge 423 to an outer diameter-side edge 424 of the top foil portion Tf is 0.66 or less.Type: GrantFiled: February 20, 2020Date of Patent: July 25, 2023Assignee: NTN CORPORATIONInventors: Masato Yoshino, Kazuyoshi Harada
-
Patent number: 11708012Abstract: A clutch unit used for a vehicle seat includes an input side clutch configured such that one member of an input side inner ring member and an input side outer ring member rotates with a rotation of an operation lever, and the other member is rotated via an input side transmission member, so that a rotation of the operation lever is transmitted to an output side clutch. A rotation suppressing member configured to apply a rotational resistance force greater than a force for the co-rotating is provided between the other member and a member that does not rotate during a return operation of the operation lever, so as to suppress co-rotation of the other member by the one member during the return operation to the neutral position.Type: GrantFiled: May 29, 2019Date of Patent: July 25, 2023Assignees: SHIROKI CORPORATION, NTN CORPORATIONInventors: Kunihiro Mikasa, Kyohei Sasanuma
-
Patent number: 11703081Abstract: A rolling bearing includes an outer ring as a fixed ring, an inner ring as a rotary ring, and rolling elements disposed between the outer ring and the inner ring. The outer ring includes, on the radially opposite side of its raceway surface, a fitting surface fitted to a mating member, two annular grooves in which elastic members are fitted, and a recess adjacent to the annular grooves, and the recess has a bottom surface having an outer diameter smaller than the outer diameter of the fitting surface.Type: GrantFiled: March 9, 2020Date of Patent: July 18, 2023Assignee: NTN CORPORATIONInventors: Takanori Ishikawa, Takashi Kawai, Nozomi Isobe
-
Patent number: 11697204Abstract: A link actuation device includes: a parallel link mechanism including a proximal-side link hub, a distal-side link hub, and three or more link mechanisms coupling the distal-side link hub to the proximal-side link hub such that a posture of the distal-side link hub can be changed with respect to the proximal-side link hub; actuators for changing the posture; and a teaching unit including a conversion unit configured to calculate coordinates (Wt (=Xt, Yt, Zt)) of a distal-side link center of the distal-side link hub, which are expressed in orthogonal coordinates, from rotation angles (?n; n=1, 2, . . . ) of the end link members. A normal vector is applied to equations of a plane and of a sphere, and the equations are rearranged and used in the conversion unit.Type: GrantFiled: May 28, 2021Date of Patent: July 11, 2023Assignee: NTN CORPORATIONInventor: Hideki Matsuzawa
-
Publication number: 20230213019Abstract: A linear-motion guiding device is disposed on the wall of the container. The wind turbine includes, at the lower end of the support column, a support-column lower end member capable of being fixed to the linear-motion guiding device. A slider of the linear-motion guiding device is provided with a guide member, and a bolt is inserted through a bolt insertion hole in the support-column lower end member and is screwed into a threaded hole in the guide member. The apparatus includes an attachment guide part including a stepped bolt and a flanged step part, the attachment guide part being configured to guide the support-column lower end member to a position and an attitude in which the bolt insertion hole in the support-column lower end member is aligned with the threaded hole in the guide member when the support-column lower end member is not fixed to the slider.Type: ApplicationFiled: March 14, 2023Publication date: July 6, 2023Applicant: NTN CORPORATIONInventor: Ryosuke KARASAWA
-
Patent number: 11691276Abstract: A link actuation apparatus that actuates a parallel link mechanism where a spherical drive mechanism is constructed includes a controller configured to calculate, based on spherical trigonometry, an attitude of a second link hub from angles ?A1 and ?A2 that represent the attitude of a first end link member with respect to a first link hub in two of at least three link mechanisms. The link actuation apparatus capable of performing forward transformation in real time is thus provided.Type: GrantFiled: May 29, 2020Date of Patent: July 4, 2023Assignees: KYUSHU INSTITUTE OF TECHNOLOGY, NTN CORPORATIONInventors: Akihiro Hayashi, Hirofumi Fukumaru, Toshiki Takagi, Kenzou Nose, Hideki Matsuzawa