Dynamic pressure pneumatic bearing structure and method of manufacturing the same
US6082900A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1998 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Oct 28, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2226/18
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Provided is a hydrodynamic gas bearing structure which can prevent occurrence of whirl not only in high-speed rotation but also in low-speed rotation, reduces such frequency that a floating rotational frequency in starting or stoppage of rotation increases, and is capable of shifting the floating rotational frequency to a low rotational frequency side. The hydrodynamic gas bearing structure comprises a shaft body (1) and a bearing body (2). A groove (11) is formed on the outer peripheral surface of the shaft body (1). The groove (11) consists of at least two concave parts, whose depths substantially differ from each other, which are formed serially in the circumferential direction, and has a circumferentially asymmetrical shape in a cross section perpendicular to the axis. The circumferential distance a between the intersection point (15) of a line (C) connecting the deepest point (14) of the groove (11) and the center (O) of the shaft body (1) and the outer peripheral line (Q) of the shaft body (1) and one edge (16) of the groove (11) positioned downward an air current (P) generated in rotation in relation to the intersection point (15) is larger than the circumferential distance …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.