Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yosei Yoshikawa

Kaoru Uenosono

Takafumi Asada

Naoshi Kainoh

Akihito Shirai

Junichi Nakamura

Kazunori Maekawa

Akira Sakata

The object of the present invention is to provide a hydrodynamic bearing, a method for manufacturing the same, and a spindle motor, with which the gap in the axial direction required for the smooth operation of a bearing can be sufficiently ensured. A method for manufacturing a hydrodynamic bearing comprising a shaft, a sleeve attached so as to be capable of relative rotation with respect to the shaft, a first flange unitfixed to or integrated with the shaft, and a second flange unit fixed to the shaft, the method comprising at least inserting the shaft into the sleeve, and inserting the shaft into the second flange unit, pressing the top face of the second flange unit in the axial direction, and fixing the second flange unit to the shaft by welding the shaft and the second flange unit while maintaining the pressing state.

Hydrodynamic bearing and method for manufacturing the same, and spindle motor and method for manufacturing the same

A hydrodynamic bearing device in a hydrodynamic bearing device in which a sleeve () is covered with a cover (), which is capable of easily confirming that a working fluid is favorably filled between the cover and the sleeve, and easily confirming that an adhesive () which bonds the cover and the sleeve is favorably filled, and an inspection method of an amount of the working fluid are provided. By using the cover having translucency, the filled state of the working fluid is visually recognized through the cover, and is confirmed with an image recognition apparatus.

Hydrodynamic bearing device and inspection method of amount of working fluid

A shaft is rotatably inserted through a bearing hole of a sleeve, a screw hole for fastening a clamp to the shaft is formed along a direction of an axis from an upper end portion of the shaft, an operating fluid is charged in a gap between an inner peripheral surface of the sleeve and an outer peripheral surface of the shaft, and radial bearing parts constituted of dynamic pressure generating grooves are provided on the inner peripheral surface of the sleeve. As for an inside diameter of the sleeve, an inside diameter in a predetermined range from the opening upper end part is formed to be larger by an expected deformation amount in a diameter direction of the shaft than an inside diameter in a range at a lower end side from the predetermined range. The predetermined range corresponds to a range including a radial bearing part located at the upper end side.

Hydrodynamic bearing device and compact motor including hydrodynamic bearing device

The invention provides a hydrodynamic bearing device with a function of circulating the operating fluid by supplying the operating fluid to between the cover and the sleeve by way of a circular communication path, the hydrodynamic bearing device allowing the cover for covering the sleeve to be satisfactorily bonded, preventing the operating fluid from leaking outward, and preventing the adhesive from blocking the opening of the circular communication path; and a spindle motor. An adhesive inflow allowing space for allowing the adhesive from the adhesive setting and bonding part to flow in is formed between the adhesive setting and bonding part for setting the adhesive and bonding the cover and the sleeve, and a space region on the open end side between the cover and the sleeve for circulating and introducing the operating fluid so as to create a space in the cover.

Hydrodynamic bearing device and spindle motor

A hydrodynamic bearing device in which an introducing minimum clearance for causing capillary phenomenon is formed from the location in the proximity of the opening of a communicating path to the open end of the bearing hole in between the cover and the end face on the open end of the sleeve so that the operating fluid from the communicating path in the sleeve flows into the bearing hole by the capillary phenomenon; a vent hole leading to the outside air is formed on the cover; a fluid storage space for storing the operating fluid is formed on the inside surface of the cover or the end face on the open end of the sleeve to communicate the introducing minimum clearance and the vent hole in the circumferential direction; and the air bubbles separated at the fluid storage space are exhausted outward from the vent hole.

Growing community of inventors

Touon, Japan

Yosei Yoshikawa