A pump a shaft portion arranged to extend in a vertical direction; a rotor portion arranged to surround an outer circumference of the shaft portion, and including a magnet; and a housing joined to the shaft portion, and arranged to contain the rotor portion. The housing includes a stator arranged opposite to the magnet; a rotor accommodating portion arranged to accommodate the rotor portion; and an inlet and an outlet each of which is arranged to pass through a portion of the rotor accommodating portion. A surface of at least one of the rotor portion, the shaft portion, and the rotor accommodating portion includes at least one first dynamic pressure groove arranged to support rotation of the rotor portion. A surface of at least one of the rotor portion and the rotor accommodating portion includes at least one second dynamic pressure groove arranged to transfer a fluid from the inlet to the outlet.

Dynamic pressure bearing pump

There is provided a hydrodynamic bearing assembly including a sleeve; and a shaft rotatably inserted into a shaft hole and constituting a bearing clearance, wherein at least one of an inner circumferential surface of the sleeve and an outer circumferential surface of the shaft includes upper and lower radial dynamic pressure grooves having a herringbone pattern, and conditional expressions a+b>c+d and b−a>c−d>0 are satisfied.

Hydrodynamic bearing assembly and spindle motor having the same

A motor includes a shaft, a shell, a sleeve, an abrasion-resistance piece, a bearing, an oil seal, and several compressed springs. The shaft has an axial line. The shell is connected to the shaft. The sleeve has an accommodating space, and the wall of the accommodating space forms a first inclined surface which is inclined at an angle with respect to the axial line. The abrasion-resistance piece is disposed at the bottom of the accommodating space. The bearing is disposed in the accommodating space, and the outer wall of the bearing forms a second inclined surface corresponding to the first inclined surface. The shaft passes through the bearing and abuts the abrasion-resistance piece. The oil seal is affixed to the wall of the accommodating space and covers the bearing. The compressed springs are connected between the oil seal and the bearing.

Motor having shock-proof design

The invention discloses a structure for protecting a bearing adopting bidirectional spiral grooves. The structure comprises a radial protection sleeve and an axial protection baffle, wherein the radial protection sleeve sleeves a rotor needing to be protected and is eccentrically arranged with the rotor, the axial protection baffle closes to one end face of the rotor but does not in contact with the end face, the end face, close to the rotor, of the axial protection baffle is provided with a plurality of spiral grooves which are wide in exteriors and thin in interiors, opened in outer ends andclosed in inner ends, and a plurality of spiral grooves which have the same width and are in one-to-one symmetry are formed in the inner wall of the radial protection sleeve from the two ends towardsthe middle; air passages leading to the spiral grooves in the axial protection baffle and the spiral grooves in the radial protection sleeve are arranged on the axial protection baffle and the radialprotection sleeve correspondingly; and when the rotor rotates at a high speed, a radial dynamic pressure gas film can be formed between the inner wall of the radial protection sleeve and the outer surface of the rotor and an axial dynamic pressure gas film can be formed between the axial protection baffle and the rotor end face close to the axial protection baffle. According to the structure, theburden on the magnetic suspension bearing can be reduced, and the function of protecting the bearing can be borne when the magnetic suspension bearing loses efficacy.

Structure for protecting bearing adopting bidirectional spiral grooves

Eine Nabenlagereinheit vom Magnetkodierer-Typ kann aufweisen: eine abgedichtete Kappe (10), die mit einem Gelenkteil (7) zum Fixieren eines an einer Nabe angeordneten Nabenlagers (5) derart verbunden ist, dass ein Innenraum zum Abschirmen des Nabenlagers (5) nach ausen hin definiert ist, ein aus Stahl ausgebildetes Innengehause (11), das zu dem Innenraum hin exponiert ist, einen Kodierer (20), der in dem Innenraum angeordnet ist, wahrend er von einer Oberflache des Innengehauses (11) beabstandet ist, und einen WSS (Wheel Speed Sensor – Radgeschwindigkeitssensor) (30), der in die abgedichtete Kappe (10) derart eingefuhrt ist, dass ein Sensor-Kopfabschnitt zu der Oberflache des Innengehauses (11) hin angeordnet ist, wobei ein Luftspalt durch einen Abstand zwischen dem Kodierer (20) und der Oberflache des Innengehauses (11) und aufgrund einer Dicke des Innengehauses (11) gebildet ist.

Nabenlagereinheit vom Magnetkodierer-Typ

There are provided a hydrodynamic bearing assembly and a spindle motor including the same. The hydrodynamic bearing assembly includes: a sleeve including a shaft hole to have a shaft rotatably installed therein; and a cover member covering the shaft hole at a lower portion of the shaft hole in an axial direction, wherein an inner surface of the sleeve is provided with depression parts depressed in an outer diameter direction between upper and lower portions of the sleeve and portions in which radial bearings are formed, such that the portions in which the radial bearings are formed are provided with bearing closure adhesion parts allowing the portions in which the radial bearings are formed to be closer to the shaft than portions other than the portions in which the radial bearings are formed.

Sung Yeol Park

Papers

Hydrodynamic bearing assembly and spindle motor including the same