Bearing unit, and motor using same

A bearing unit comprising:

• a shaft consisting of a body having a circular section and a disc-shaped radial projection formed on one end of the shaft body and having a larger diameter than the shaft body;
• a radial bearing to support the shaft circumferentially of the latter;
• a thrust bearing disposed opposite to the radial projection of the shaft to support the shaft at one of thrusting-directional ends of the latter;
• and
• a housing having disposed therein the radial and thrust bearings which support together the shaft, filled with a viscous fluid, and having a closed structure except for a shaft insertion hole through which the shaft is introduced;
• the housing including a first compartment to receive and hold the radial bearing, a second compartment to receive and hold the thrust bearing, a radial projection compartment formed between the radial and thrust bearings to receive the radial projection of the shaft rotatably, and a partition member provided in a position where the first compartment and radial projection compartment are to be parted from each other;
• and
• there being formed on either the side of the partition member opposite to the radial projection of the shaft or the side of the radial projection opposite to the partition member a dynamic pressure producing means for producing a dynamic pressure by the viscous fluid.

A motor including a rotor and stator and provided with a bearing unit which supports the rotor rotatably in relation to the stator, the bearing unit included in the motor comprising:

• a shaft consisting of a body having a circular section and a disc-shaped radial projection formed at one end of the shaft body and having a larger diameter than the shaft body;
• a radial bearing to support the shaft circumferentially of the latter;
• a thrust bearing disposed opposite to the radial projection of the shaft to support the shaft at one of thrusting-directional ends of the latter;
• a housing having disposed therein the radial and thrust bearings which support together the shaft, filled with a viscous fluid, and having a closed structure except for a shaft insertion hole through which the shaft is introduced;
• and
• a spacer member disposed in the housing to keep a gap between the end face of the radial bearing and one side of the radial projection of the shaft;
• there being formed on the end face of the radial bearing opposite to one side of the radial projection a first dynamic pressure producing means for producing a dynamic pressure by the viscous fluid;
• and
• there being formed on the side of the thrust bearing opposite to the other side of the radial projection a second dynamic pressure producing means for producing a dynamic pressure by the viscous fluid.

A motor including a rotor and stator and provided with a bearing unit which supports the rotor rotatably in relation to the stator, the bearing unit included in the motor comprising:

• a shaft consisting of a body having a circular section and a disc-shaped radial projection formed at one end of the shaft body and having a larger diameter than the shaft body;
• a radial bearing to support the shaft circumferentially of the latter;
• a thrust bearing disposed opposite to the radial projection of the shaft to support the shaft at one of thrusting-directional ends of the latter;
• and
• a housing having disposed therein the radial and thrust bearings which support together the shaft, filled with a viscous fluid, and having a closed structure except for a shaft insertion hole through which the shaft is introduced;
• the housing including a first compartment to receive and hold the radial bearing, a second compartment to receive and hold the thrust bearing, a radial projection compartment formed between the radial and thrust bearings to receive the radial projection of the shaft rotatably, and a partition member provided in a position where the first compartment and radial projection compartment are to be parted from each other;
• and
• there being formed on the side of the partition member opposite to the radial projection of the shaft a dynamic pressure producing means for producing a dynamic pressure by the viscous fluid.