1. A spindle motor having a fluid dynamic bearing system comprising:
a base, a stationary shaft connected to the base, a hub rotatably supported with respect to the shaft, a first bearing plate and a second bearing plate that are disposed at a mutual spacing about the shaft and connected to the hub, a bushing that is disposed between the first bearing plate and the second bearing plate and separated from the first bearing plate by a first gap at least partly filled with bearing fluid and separated from the second bearing plate by a second gap at least partly filled with bearing fluid, a first stopper plate and a second stopper plate that are fixedly connected to the shaft, the first stopper plate abutting one side of the first bearing plate and separated from the first bearing plate by a first bearing gap filled with bearing fluid, the second stopper plate abutting one side of the second bearing plate and separated from the second bearing plate by a second bearing gap filled with bearing fluid, a first fluid dynamic bearing system which is disposed about the first bearing plate, a second fluid dynamic bearing system which is independent of the first fluid dynamic bearing system and which is disposed about the second bearing plate, and an electromagnetic drive system.
2. A spindle motor according to claim 1, characterized in that the bushing is fixedly connected to the shaft.
3. A spindle motor according to claim 1, characterized in that the bushing is fixedly connected to the hub.
4. A spindle motor according to claim 1, characterized in that each of the first fluid dynamic bearing system and the second fluid dynamic bearing system consists of a radial and an axial bearing, and is spatially separated and sealed towards the interior of the motor by said bushing disposed between the first bearing plate and the second bearing plate.
5. A spindle motor according to claim 1, characterized in that a first radial bearing is formed between the inside diameter of the first bearing plate and the shaft with the aid of an appropriate first bearing pattern and in that a second radial bearing is formed between the inside diameter of the second bearing plate and the shaft with the aid of an appropriate second bearing pattern.
6. A spindle motor according to claim 5, characterized in that the first bearing pattern and the second bearing pattern are formed as symmetric or asymmetric groove patterns.
7. A spindle motor according to claim 1, characterized in that a first axial bearing is formed between the opposing surfaces of the first bearing plate and the abutting first stopper plate with the aid of an appropriate first bearing pattern and in that a second axial bearing is formed between the opposing surfaces of the second bearing plate and the abutting second stopper plate with the aid of an appropriate second bearing pattern.
8. A spindle motor according to claim 7, characterized in that the first bearing pattern and the second bearing pattern are formed as symmetric or asymmetric groove patterns.
9. A spindle motor according to claim 1, characterized in that in the first bearing plate at least one recirculation channel is provided that connects the opposing end faces of the first bearing plate to each other and in that in the second bearing plate at least one recirculation channel is provided that connects the opposing end faces of the second bearing plate to each other.
10. A spindle motor according to claim 1, characterized in that a first reservoir having a conical cross-section is provided between the first stopper plate and the hub, the first reservoir being connected to the first bearing gap, and in that a second reservoir having a conical cross-section is provided between the second stopper plate and the hub, the second reservoir being connected to the second bearing gap.
11. A spindle motor according to claim 1, characterized in that the first bearing gap is sealed by an active pumping seal that is formed by a first narrow gap provided with suitable pumping patterns formed between the bushing and the hub and in that the second bearing gap is sealed by an active pumping seal that is formed by a second narrow gap provided with suitable pumping patterns formed between the bushing and the hub.
12. A spindle motor according to claim 1, characterized in that the first bearing gap is sealed by an active pumping seal that is formed by a first narrow gap provided with suitable pumping patterns formed between the outside diameter of the first stopper plate and the corresponding inside diameter of the hub and in that the second bearing gap is sealed by an active pumping seal that is formed by a second narrow gap provided with suitable pumping patterns formed between the outside diameter of the second stopper plate and the corresponding inside diameter of the hub.
13. A spindle motor according to claim 1, characterized in that a first tapered reservoir for the first fluid dynamic bearing system is disposed adjoining the first gap between the bushing and the hub in the region of the interior of the motor and in that a second tapered reservoir for the second fluid dynamic bearing system is disposed adjoining the second gap between the bushing and the hub in the region of the interior of the motor.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A scroll structure of a rotary machine, comprising:
a scroll main body that entirely covers an area surrounding an annular channel extending in a circular shape about a rotational axis in a rotating portion of the rotary machine and a cylindrical channel extending from the annular channel and extending towards the rotating portion;
a casing constituting an outer shape of the rotary machine and accommodating the scroll main body therein; and
a fitting portion that supports the scroll main body with respect to a support portion, so as to enable expansion and contraction of the scroll main body in a radial direction centered on the rotational axis,
wherein the fitting portion includes:
a turbine portion-side restraining portion that restrains movement of the scroll main body along the rotational axis, with respect to the support portion, and
a casing-side restraining portion that restrains movement of the scroll main body along the rotational axis, with respect to the support portion,
wherein each of the turbine portion-side restraining portion and the casing-side restraining portion comprises:
a ring which is provided on the scroll main body,
a ring which is provided on the support portion,
protrusions which are disposed on the ring on the scroll main body, and which protrude in a radial direction;
a groove which is disposed on the ring which is provided on the support portion, the groove being open in the radial direction and into which the protrusions are fitted, and
depressions which are formed in the ring which is provided on the support portion and which are formed in one wall of a pair of wall portions defining the groove and through which the protrusions pass by moving relative to the one wall, along the rotational axis, and
wherein the turbine portion-side restraining portion and the casing-side restraining portion are disposed on opposite sides of the cylindrical channel.
2. A rotary machine comprising:
the scroll structure according to claim 1; and
a turbine into which or from which a working fluid flows, between the turbine and the scroll structure, and which extracts a rotational driving force from the supplied working fluid.
3. A scroll structure of a rotary machine, comprising:
a scroll main body that entirely covers an area surrounding an annular channel extending in a circular shape about a rotational axis of a rotating portion of the rotary machine and a cylindrical channel extending from the annular channel and extending towards the rotating portion;
a casing constituting an outer shape of the rotary machine and accommodating the scroll main body therein; and
a fitting portion that supports the scroll main body including the annular channel and the cylindrical channel with respect to the casing, so as to enable expansion and contraction of the scroll main body in a radial direction centered on the rotational axis, with respect to the casing, whilst restraining movement of the scroll main body along the rotational axis,
wherein the fitting portion includes:
a turbine portion-side restraining portion that restrains movement of the scroll main body along the rotational axis, with respect to the casing,
a casing-side restraining portion that restrains movement of the scroll main body along the rotational axis, with respect to the casing,
a horizontal restraining portion that is disposed above the annular channel that restrains movement of the scroll main body in a horizontal direction with respect to the casing, and
a vertical restraining portion that is disposed diagonally below the annular channel and that restrains movement of the scroll main body in a vertical direction with respect to the casing,
wherein the casing-side restraining portion comprises:
protrusions which are disposed on the casing and which protrude in a radial direction; and
depressions which are disposed on the scroll main body, and which are open in the radial direction and into which the protrusions are fitted, and
wherein the turbine portion-side restraining portion and the casing-side restraining portion are disposed on opposite sides of the cylindrical channel.