摘要:
Provided is a magnetic fluid sealed bearing with which torque can be reduced without impairing a water and dust proof effect. A magnetic fluid sealed bearing according to the present disclosure includes a magnetic fluid retained by a ring-shaped magnet in an opening between an inner ring and an outer ring to seal a plurality of rolling members. The magnet is magnetized such that their magnetic poles point to an axial direction. The bearing further includes a ring-shaped outer polar plate and a ring-shaped inner polar plate sandwiching the ring-shaped magnet therebetween, one side of the polar plates being fixed to one of the inner ring and the outer ring, and the other side of the polar plates facing a clearance.
摘要:
A ball bearing (rolling bearing) containing lubricant sealed therein is provided between a shaft and a sleeve. A labyrinth seal (seal gap) is provided at an end portion of the shaft or the sleeve in the axial direction. A permanent magnet is disposed such that a magnetic pole is located in proximity to the labyrinth seal. A magnetic seal effect that utilizes diamagnetism acting on evaporating oil is provided at the labyrinth seal.
摘要:
Provided is a bearing with a magnetic fluid seal reliably maintaining sealing of a rolling element section in the bearing and having a structure ensuring high productivity. In a bearing with a magnetic fluid seal according to the present invention, a plurality of rolling elements 7 are disposed between an inner ring and an outer ring, and a ring-shaped magnet is arranged at an opening side of the inner and outer rings so as to retain magnetic fluid, so that the plurality of rolling elements are sealed. The magnet is magnetized so that magnetic poles are oriented in an axial direction. A ring-shaped pole plate is arranged to be in contact with an outer side surface of the magnet in the axial direction. Outer-ring-side magnetic fluid is retained between the outer ring and the magnet, and inner-ring-side magnetic fluid is retained between the inner ring and the pole plate.
摘要:
A bearing mechanism includes: a bearing that includes an inner and outer races, the outer race facing the inner race and a rolling element being interposed between the inner and outer races; a magnet that includes a first and second magnetic poles and extends between the first and second magnetic poles along an axial direction of the bearing, the first magnetic pole being in contact with an end surface of the outer race and the second magnetic pole opposing the first magnetic pole; a yoke that forms a magnetic circuit together with the bearing and the magnet, the yoke extending between the second magnetic pole and an end surface of the inner race so that the yoke is in contact with the second magnetic pole and faces the end surface of the inner race with a gap interposed therebetween; and a magnetic fluid held by the magnetic circuit.
摘要:
One object is to provide a fishing reel including a magnetic fluid sealed bearing wherein foreign substances are shut out from the magnetic fluid seal to prevent degradation of the magnetic fluid (degradation of the magnetic sealing function). In accordance with one aspect, the fishing reel of the present invention includes a magnetic fluid sealed bearing rotatably supporting a drive shaft (pinion). Protection walls are disposed opposite to each other on or near the sides of the bearing body so as to shut out foreign substances from the bearing body of the magnetic fluid sealed bearing.
摘要:
A rolling bearing used in a power transmission device for transmitting power such as turning force, characterized in that a magnet for holding in a lubrication portion of the rolling bearing a lubricating magnetic fluid for lubricating the lubrication portion is provided on at least one side of an outer race of the rolling bearing, and an annular yoke made of a magnetic material loosely fitted to a rotating shaft is provided on the opposite side of said magnet relative to said outer race, and a cross-sectional profile of the yoke has an I-shape.
摘要:
The present disclosure describes a magnetic fluid sealing device having a shaft centered with respect to a magnetic structure and rolling element bearing, as well as a method for centering the shaft in the device. A compressible ring located in a groove on the shaft is used to partially fill the gap between the shaft and the rolling element bearing and to make contact with the rolling element bearing. The compressible ring aligns and centers the shaft with the rolling element bearing. A liquid locking material is added to the gap and hardened to couple the shaft and compressible ring to the rolling element bearing. An alternative self-alignment mechanism is also disclosed.
摘要:
A fluid seal is disposed in a radial gap between a shaft of a motor and a hub rotatably held about the shaft, for preventing contaminates such as oil dusts and the like within the motor from leaking to the outside of the motor. The fluid seal has an annular body disposed about the axis of the motor shaft that is fixed to the hub directly or with a fluid seal holder. The annular sealing surface of the annular body is spaced from the outer sealing surface of the shaft by a minute gap, and a sealing portion is formed in the gap. The gap is filled with a fluid having a sufficient barrier pressure to prevent contaminates from flowing out of the motor. The fluid seal may have an approximately concave shape facing the axis of the shaft when the shaft is cut away by a plane passing through the axis of the shaft. This structure prevents the fluid from being scattered due to centrifugal force arising during operation of the motor. The fluid seal also may have an angled seal structure to keep the fluid in against external shocks. A fluid seal built-into a ball bearing is also disclosed.
摘要:
The present invention relates to a spindle motor with a magnetic seal. A method and an apparatus are described for sealing spindle motors, preferably those used for disk storage units.
摘要:
A sealing apparatus which is disposed between the media side and the bearing side and adapted to hermetically seal members rotating concentrically relative to each other, wherein a passageway having in a U-shaped cross section is formed by an outer shielding member on the media side, an outer shielding member on the bearing side and an inner shielding member, the end portion of which is inserted into the cavity between the outer shielding members. The end portion of the inner shielding member has a T-shape or L-shape. A magnet is arranged at either the inner shielding member or the outer shielding member. A ferrofluid is retained in the cavity by the surrounding magnet. An oil repellent material may be coated on the surface of the inner shielding member except for a portion extending into the cavity and an adhered portion on its inner diameter side.