Seiko Instruments Inc

Futaba Corporation

Takafumi Suzuki

Hiromitsu Goto

Tadao Iwaki

Naoki Kawawada

Isamu Takehara

Koji Nitadori

Yukihiro Nakayama

Atsushi Ohta

Toshiharu Kogure

Atsushi Ota

Ryouji Yoneyama

Shigeru Ohki

Noriaki Morita

Mitsuharu Iwamoto

Radio remote control unit

A motor has a support member, a bearing member mounted in a hollow space of the support member for undergoing rotation, a rotor member having a shaft portion disposed in a hollow space of the bearing member for rotation therewith, at least one magnet connected to one of the support member and the rotor member, and electromagnets connected to the other of the support member and the rotor member and in confronting relation to the magnet for generating a rotational magnetic field that coacts with the magnet to rotate the rotor member. At least one of an inner peripheral surface of the bearing member and an outer peripheral surface of the shaft portion of the rotor member has contact portions disposed in contact with the other of the inner peripheral surface and the outer peripheral surface to form lubricating gaps each disposed between an adjacent pair of contact portions and between the inner and outer peripheral surfaces.

Motor and rotary apparatus having motor

Motor, method of manufacturing motor and rotary apparatus equipped with motor

A double sleeve type dynamic bearing comprises a fixed shaft having at least one end fixedly mountable to an apparatus in which the bearing is utilized, a rotary sleeve arranged coaxially with the fixed shaft so that a first fine gap is formed therebetween, a fixed sleeve arranged coaxially with the rotary sleeve so that a second fine gap is formed therebetween, and a lubrication oil filled in the fine gaps. The first fine gap and the second fine gap each have an open end exposed to air outside the bearing and an opposite end that is not exposed to the air, the opposite ends being in communication with each other. A holding member holds the fixed shaft and the fixed sleeve and is disposed adjacent to a lower end surface of the rotary sleeve to form a third fine gap between the holding member and the lower end surface of the rotary sleeve. The third fine gap is formed with a thrust dynamic pressure producing groove, and opposite ends of the first and second fine gaps meet each other through the third fine gap. A peripheral surface of at least one of the fixed shaft, the rotary sleeve and the fixed sleeve forming at least one of the first and second fine gaps has a dynamic pressure producing groove formed therein.

Hydraulic dynamic bearing and spindle motor and rotary assembly provided

In order to alleviate mutual interference between axial dynamic pressure portions and a radial dynamic pressure portion in a ring-like hydraulic dynamic pressure bearing, in the case of a ring-like hydraulic dynamic pressure bearing constituted by supporting a shaft portion constituted by fixing a ring to an end portion A of a shaft main body by a bearing portion , ring-like spaces and for storing lubricant for generating dynamic pressure are provided along contiguous portions of the radial dynamic pressure bearing portion and the axial dynamic pressure bearing portions formed between the ring and the bearing portion , and the ring-like spaces and are maintained at atmospheric pressure via paths formed at the bearing portion to thereby prevent negative pressure from generating at boundary regions of the two dynamic pressure bearing portions.

Hydraulic dynamic bearing and spindle motor

The present invention is a double sleeve type fluid dynamic pressure bearing, comprising a fixed shaft having respective ends to be fixed to a utilized apparatus; a rotary sleeve arranged to provide a first fine gap between an inner peripheral surface thereof and an outer peripheral surface of the fixed shaft, a fixed sleeve arranged to provide a second fine gap between an inner peripheral surface thereof and an outer peripheral surface of the rotary sleeve, a holder member arranged to cooperate with a lower end surface of the rotary sleeve to provide a third gap, and wherein the first fine gap and the second fine gap are formed with radial dynamic pressure producing grooves while the third fine gap is formed with a thrust dynamic pressure producing groove, the first, second and third fine gaps being filled with lubrication oil, the first fine gap and the second fine gap having one ends made as opening ends contacting with the air and the other ends made as closed ends communicated with each other through the third fine gap.

To provide a motor capable of solidly supporting a stator coil with high rigidity and having inconsiderable vibration and noise, a method of fabricating a motor and a rotary body apparatus, there is provided a motor including a base,, a sleeve,erected on the base, a yoke,having a hollow portion in a regular polygonal shape penetrating from one end to other end, the hollow portion being inserted to the sleeve,and coaxially fixed to the sleeve,, a stator coil,including coils,formed by winding lead wires at a, plurality of locations of the yoke,, a rotor member,supported coaxially with and rotatably by the sleeve,and a rotor magnet,fixed to the rotor member,and urged by rotational magnetic field in which an inner peripheral face portion of the yoke,is brought into contact with an outer peripheral face portion of the sleeve,at substantially central portions thereof among contiguous ones of corner portions thereof over an entire length along an axial direction and is constituted by the respective contact portions and separated portions where the respective plane portions reaching the corner portions on both sides are separated from and opposed to the sleeve

Motor, method of producing motor, and rotator device

A hydraulic dynamic bearing has a rotational assembly and a bearing member for rotationally supporting the rotational assembly. The bearing member has a main body having a recess portion and a cover for covering an open end of the recess portion. The rotational assembly has a shaft main body having an end portion extending into the recess of the bearing main body for undergoing rotation relative thereto and a ring member disposed in the recess of the bearing main body. The ring member is connected to the end portion of the shaft main body for rotation therewith. Axial dynamic pressure generating grooves are formed in upper and lower surface portions of the ring member for generating axial dynamic pressure during rotation of the rotational assembly. Radial dynamic pressure generating grooves are formed in an outer peripheral surface portion of the ring member for generating radial dynamic pressure during rotation of the rotational assembly. Spaces are formed between the bearing member and the rotational assembly for storing a lubricant.

Hydraulic dynamic bearing and spindle motor utilizing hydraulic dynamic bearing

In a method for assembling a spindle motor having a liquid dynamic pressure bearing having a flanged shaft member formed by press-fitting a dynamic pressure ring member on a cylindrical member, a hub is press-fit on the flanged shaft member without causing deviation in the press-fit position of the dynamic pressure ring member. A hub press-fitting apparatus press fits a mount hole of the hub on a cylindrical end portion of the cylindrical member. The hub press-fitting apparatus comprises a hub holding member, a rotation shaft member, a coupling member, and an anti-rotation member. During assembly, a temporary coupling between the hub press-fitting apparatus and the liquid dynamic pressure bearing is made by screwing a threaded tap in a tap hole provided in an end face of the cylindrical member.

Growing community of inventors

Chiba, Japan

Takafumi Suzuki