A hinge assembly includes a rotation shaft, a first connection member provided at the rotation shaft, a second connection member provided at the rotation shaft, located at one side of the first connection member along an axial direction of the rotation shaft, and configured to rotate around the rotation shaft, and an adjustment member connected to the rotation shaft and configured to press the second connection member along the axial direction of the rotation shaft.

To provide a fluid dynamic bearing lubricating oil base oil which is within a suitable 40° C. and 100° C. kinematic viscosity range capable of achieving both energy saving and high bearing rigidity, and is excellent in viscosity index, heat resistance (evaporation resistance), and low temperature fluidity. Provided is a fluid dynamic bearing lubricating oil base oil containing a trimellitic acid triester compound represented by the following general formula (1)

##STR00001##

wherein R1 to R3 are the same or different and each represent a linear alkyl group having 6 to 10 carbon atoms.

To provide a fluid dynamic bearing lubricating oil base oil which is within a suitable 40° C. and 100° C. kinematic viscosity range capable of achieving both energy saving and high bearing rigidity, and is excellent in viscosity index, heat resistance (evaporation resistance), and low temperature fluidity. Provided is a fluid dynamic bearing lubricating oil base oil containing an isophthalic acid diester compound represented by the following general formula (1)

##STR00001## wherein R1 and R2 are the same or different and each represent a linear alkyl group having 6 to 10 carbon atoms.

A fan clutch assembly includes several features. A first feature relates to a lubrication passage that runs through the clutch package and has a return collection passage that extends through the operating piston. As a result, pitot tubes employed behind the piston may not be necessitated. Additionally, an anti-tamper device may be installed on the lead screw body to prevent adjustment of the fan hub and unintentional adjustment of the load carried on various bearings contained within the fan clutch assembly. Additionally, to position the speed sensor appropriately, a transfer shaft is provided that extends from the fan hub and/or lead screw back to the backside where a sensor is provided. This transfer shaft can be adjusted to precisely locate the sensor target relative to the sensor.

A device is provided that includes a heat conductive structure; a heat transfer structure for extracting heat from the heat conductive structure by means of a boundary layer; a motor for rotating the heat transfer structure relative to the heat conductive structure; and a vertical fixing mechanism for allowing the heat transfer structure to rotate above the heat transfer structure without making contact with the heat transfer structure so as to define a boundary layer between the heat conductive structure and heat transfer structure, wherein the heat transfer structure extracts heat from the heat conductive structure by means of the boundary layer, and wherein the heat conductive structure includes small geometric turbulators.

An oil bearing structure of a fan includes a shaft seat, a rotating shaft, and an oil bearing. The shaft seat includes a boss. A middle portion of the boss defines a slot. One end of the rotating shaft is inserted into the slot. Another end of the rotating shaft is a free end. The oil bearing is sleeved on an outer periphery of the rotating shaft. An axis of the rotating shaft and an axis of the oil bearing are perpendicular to the shaft seat. An effective length of the oil bearing and the rotating shaft is 50%-70% of a length of the fan.

A discharge excitation gas laser device may include a laser chamber in which a laser gas containing a halogen gas is encapsulated, a pair of discharge electrodes disposed to face each other inside the laser chamber, a fan disposed inside the laser chamber to make the laser gas flow between the pair of discharge electrodes, a motor for rotating the fan, a motor power supply for supplying power to the motor, a magnetic bearing configured to levitate the rotary shaft of the fan magnetically, a displacement sensor for detecting the position of the rotary shaft through a can, and a controller configured to measure the rotational speed of the fan on the basis of a detection signal from the displacement sensor and control the motor power supply in such a manner that the measured rotational speed becomes a target rotational speed.

A dynamic pressure bearing apparatus includes a bearing portion, a shaft, a radial dynamic pressure bearing portion, and a seal gap. An annular member arranged in an annular shape, fixed to the shaft axially between the seal portion and the attachment surface, and arranged to extend radially outward beyond an opening of the seal gap. A minute horizontal gap extending radially is defined between an upper surface of the bearing portion and a lower surface of the annular member. The seal gap is arranged to be in communication with an exterior space through the horizontal gap.

A fan device with oil-retaining bearing includes a base seat and an oil-retaining bearing. The base seat has a central tubular section and a bearing cup extending from the central tubular section to one side. The bearing cup has an internal bearing hole. The central tubular section has at least one mating section in adjacency to the bearing hole. The oil-retaining bearing is disposed in the bearing hole. The oil-retaining bearing has at least one connection section mated with the mating section. The connection section and the mating section are mated with each other so that the oil-retaining bearing is securely disposed in the bearing hole. In addition, the operation of the shaft will not be affected due to the press fit and the difficulty in controlling the glue dispensing process.

A bushing structure cooperating with a shaft is disclosed. The bushing structure includes a cylindrical body and an extension portion. The cylindrical body has a shaft hole and the shaft is disposed in the shaft hole. The extension portion is disposed at one end of the cylindrical body and surrounds the cylindrical body. The cylindrical body and the extension portion are made of an iron-contained material.