Ntn Corporation

Seiichi Takada

Hiroyoshi Ito

Masaaki Honda

Tsutomu Maiwa

Atsushi Yoshioka

Chiyori Satou

Atsushi Morooka

Katsumi Nagano

Masahiro Kawai

Hidenobu Mikami

Kazuo Hirose

Masahiro Kurita

Toshiyuki Mizutani

Masakazu Hirata

Takashi Yamamoto

Hideshi Nishiwaki

Yoshihiko Oeda

Chiharu Ito

Yukihiro Takeda

Chikara Katagiri

Ikuma Fujitsuka

Makoto Seriu

Makoto Tanaka

Noriko Kurita

Kaoru Omoto

An electric lock includes an input switching clutch for selectively transmitting electric or manual driving force to an output line. The input switching clutch includes an outer ring that rotates together with an electrically driven input gear, and an inner ring which rotates together with an output gear. Wedge-shaped spaces are defined between the outer ring and the inner ring. Two rollers are mounted in each wedge-shaped space and are biased toward narrow portions of the wedge-shaped space by a coil spring also mounted in the wedge-shaped space. The input switching clutch further includes an unlocking piece having crossbars inserted at both circumferential ends of the respective wedge-shaped spaces, and coupled to a manually driven input shaft so that rotation of the manually driven input shaft can be transmitted thereto; and a torque transmission mechanism for transmitting the rotation of the manually driven input shaft to the inner ring.

Electric lock

An annular sensor holder () has an axial end () including a protrusion (). The axial end () is fitted in a circumferential groove (), such as a seal groove, of a bearing race () fitted to a stationary member () so that the sensor holder () can slide in the circumferential direction relative to the bearing race (). In this state, the sensor holder () is coupled to the stationary member () by a fixing arrangement (). Thus, when the bearing race () creeps, the sensor holder () slides relative to the bearing race () and does not rotate relative to the stationary member (). This prevents breakage of connecting wires.

Bearing assembly with rotation sensor

A spring type one-way clutch includes an outer ring rotatable about a rotary shaft and having an inner tubular portion, and a clutch spring mounted in the outer ring. The clutch spring includes a large-diameter coil spring portion, a transition portion connected to the winding end of the large-diameter coil spring portion, and a small-diameter coil spring portion connected to the radially inner end of the transition portion and wound in the opposite direction from the large-diameter coil spring portion. When the outer ring is rotated in the direction opposite the winding direction of the large-diameter coil spring portion, the large- and small-diameter coil spring portions are radially compressed and pressed against the inner tubular portion and the rotary shaft, allowing the rotary shaft to rotate together with the outer ring. The transition portion spirals radially inwardly in the winding direction of the large-diameter coil spring portion.

Spring type one-way clutch

The bearing unit includes a bearingand bearing unit forming component parts such as, for example, a housingin which the bearing is incorporated, a shaft, coversandand a sealing memberfor the housing. In this bearing unit, at least one of the bearing unit forming component parts is fitted with an IC tagand an IC tagis also fitted to the bearing. The IC tagfitted to the bearing unit forming component part is of a read/write type whereas the IC tagfitted to the bearingis of a read-only type. The read-only IC tagfitted to the bearingis recorded with information necessary to correlate the bearing unit forming component part, to which the IC tagis fitted, with the bearing unit

IC tag equipped bearing unit

A bearing unit is provided in an inner peripheral portion of a sensor housing in which a sensor portion is installed. The sensor portion includes a sensor mounting substrate and a sensor fixed to this sensor mounting substrate. The sensor housing is provided with an axially extending substrate mounting groove formed in a direction of a chord which will define the circular section of the outer peripheral surface of the sensor housing. The sensor mounting substrate is mounted on this substrate mounting groove to install the sensor portion within the sensor housing.

Rotation sensor-equipped bearing

A rotation transmission device includes coaxial input and output shafts (and), a pair of opposed bevel gears (and) rotatably mounted around the input shaft (), and an intermediate bevel gear () meshing with the opposed bevel gears (and). The output shaft () and one of the opposed bevel gears () are rotationally fixed to each other. A first one-way clutch () is provided through which the rotation of the input shaft () is transmitted to the one of the opposed bevel gears (). A second one-way clutch () is provided through which the rotation of the input shaft () in the reverse direction is transmitted to the other of the opposed bevel gears (). Thus, the output shaft () can be rotated in the normal direction irrespective of whether the input shaft () is rotated in the normal direction or in the reverse direction.

Rotation transmission device

It is an object of the present invention to provide a sliding bearing which has a simple construction and thus can be produced easily and at a low cost and yet eliminates the need for the use of a heat insulation sleeve and the like and is capable of maintaining a frictional torque to a low extent. A sliding bearing () has an inner ring (), an outer ring (), and a sliding contact member () interposed therebetween. The inner ring () has a curved surface () formed along an outer circumference thereof and a shaft-receiving hole which fits on a supporting shaft along an inner circumference thereof. The sliding contact member () is a molded body, made of resin composition, which has a curved surface () making sliding contact with the curved outer circumferential surface () of the inner ring () with the curved surface () being opposed to the curved outer circumferential surface (). The outer ring () does not contact the inner ring () and holds the sliding contact member () on an inner circumferential side thereof with the outer ring () covering the sliding contact member (). The outer ring () has an open portion () formed on an axial one end surface thereof and a pawl portion () formed at an edge of the open portion (). The sliding contact member () is combined with the outer ring () by inserting the sliding contact member () into the outer ring () from the open portion () thereof and fixed by the pawl portion ().

Sliding bearing

A bearing assembly with a sensor, includes an annular, synthetic resin sensor holder supported on an outer race using a circumferential groove of the outer race so as to be strongly fixed in position by a spring member having circumferential half-split elastic recovery portions. The spring member is a square sectional wire and includes a main portion fitted in an annular groove of the sensor holder, and opposite end portions that circumferentially protrude from the annular groove and are located inside an open recess of the sensor holder. The opposite end portions of the spring member overlap axially when fitted in the annular groove, and abut and are deflected when one of the end portions is shifted to remove the overlapping. Forces caused by elastic recovery of the deflected end portions increase the force of the main portion pushing the sensor holder in a radially outward direction.

Bearing with sensor

A switching device includes input and output gears, and a rotational direction switching mechanismdisposed between the input and output gears. The switching mechanism includes intermediate bevel gearssupported on an intermediate shaftand meshing with input and output bevel gears, a control gearhaving a release arm portionand a stopper arm portion, and a one-way clutch fitted in a radially inner surface of a clutch receiving portion integral with the input bevel gear. When a spring clutchis used as the one-way clutch, an adaptor portionis provided on a coupling memberof the spring clutch, which is fitted on the intermediate shaft. When a roller clutchis used as the one-way clutch, an adaptor portionof the same structure is provided on its inner ring

Switching device for switching driving force between forward and reverse directions

A device transmits input member rotation in one direction to output member rotation in one or the opposite direction, and includes input and output gears and a switch mechanism. The switch mechanism includes planetary gear, control, and clutch mechanisms. The planetary gear mechanism includes a sun gear integral with a rotation shaft, an internal gear integral with the output gear, planetary gears between the sun gear and the internal gear, and a carrier. The control mechanism includes a control gear selectively locked and unlocked by an actuator. With the actuator off, the roller clutch is locked, the planetary gears only revolve, and the input and output rotation directions are the same. With the actuator on, the roller clutch is unlocked, the planetary gears only rotate, and input rotation in the forward rotation direction is converted to output in the reverse direction.

Device for switching between normal and reverse drive force

A clutch unit includes axially arranged input, output and reverse input gears, and a spring clutch. The input and output gears respectively include radially opposed input and output clutch portions. The spring clutch is tightly bound to the input clutch portion and includes coil springs each having transmission and release hooks. With the transmission hooks in engagement with the output clutch portion, the release hooks are spaced forward from the transmission hooks. From an unlocking state, when the release portion is reverse rotated by distance c while pushing the release portions, the spring clutch is unlocked, and when a reverse rotational portion is reverse rotated by distance b, it engages a reverse rotation engaging portion. When the release portion is further reverse rotated after the spring clutch has been unlocked by distance a, the release portion engages the hook engaging portion and stops. a&#x3e;b&#x3e;c.

Rotational direction switching clutch unit

The object is to produce a magnetic encoder having a large outer diameter at a low cost, provide a sensor case which is compact in size and can be easily mounted and dismounted with a sensor element received therein, and to provide a double row rolling bearing with a preload application device and a rotational speed sensor which comprises a small number of parts and thus can be assembled easily. A magnetic memberof the magnetic encoderis made of a magnetic material bound by rubber. The magnetic memberis bonded to an annular presser member, which also serves as a metal core, by an adhesive, thus eliminating the need for a mold and other facilities for vulcanization bonding. This makes it possible to manufacture a magnetic encoderwith a large outer diameter at a low cost.

Rolling bearing with rotational speed sensor

To provide an IC-tagged bearing device, in which difficulties brought about by reflection and/or absorption of radio waves upon and/or in raceway members or the like can be avoided, information recording can be accomplished satisfactorily, an IC tag itself does not require an antenna, and the IC tag can have a compact, yet large capacity. The bearing device, having a bearing space delimited between inner and outer races () and sealed by a sealing member (), includes an IC tag () which utilizes a core metal () as an antenna and which is fitted to the sealing member (). The sealing member () is made of a rubber material or a synthetic resin having the core metal ().

Bearing with IC tag and seal for the same

A reversible transmission mechanism includes an input member rotatable about a fixed shaft and having a bevel gear, a first shaft member rotatable about the fixed shaft and having a shaft portion extending perpendicular to the fixed shaft, and a second shaft member rotatable about the fixed shaft and rotationally fixed to the first shaft member. An output member is rotatably mounted around the second shaft member and has a bevel gear at one end thereof axially facing the bevel gear of the input member. A planetary bevel gear is rotatably mounted around the shaft portion of the first shaft member so as to mesh with the bevel gears of the input and output members. The second shaft member is selectively coupled to and uncoupled from the output member by a clutch. When the second shaft member is uncoupled from the output member, the rotation of the second shaft member is stopped by a brake.

Growing community of inventors

Kuwana, Japan

Seiichi Takada