1. A Ram Air Turbine (RAT), comprising:
a turbine hub having an end plate and a nose cone attached thereto at trailing and leading ends, respectively;
a governor shaft, to which turbine blades are connected, which is coupled to the end plate and supported within the nose cone to be rotatable with the turbine blades about a central axis thereof and axially movable from a first position relative to the turbine hub to a second position relative to the turbine hub; and
a hub assembly operably coupled to the turbine hub, the governor shaft and the turbine blades whereby the hub assembly biases the governor shaft toward:
the first position at low rotational speeds such that the turbine blades assume a partial coarse pitch angle of about 30 degrees, and
the second position at high rotational speeds such that the turbine blades assume a fine pitch angle,
wherein the nose cone comprises a body having an aft facing surface, the body and the aft facing surface defining a forwardly extending recess from the aft facing surface at the central axis in which the governor shaft is supported, and
wherein the hub assembly further comprises a shaft spring anchored to the end plate to apply bias to the governor shaft and a plurality of governor springs anchored to a forward spring seat disposed aft of a leading edge of the governor shaft.
2. The RAT according to claim 1, wherein a leading end of the governor shaft is supported within the recess.
3. The RAT according to claim 2, wherein the leading end occupies a shallow section of the recess when the governor shaft is moved to the second position and a distal end of the recess when the governor shaft is moved to the first position.
4. The RAT according to claim 1, wherein the turbine blades assume about a 9 degree fine pitch angle.
5. The RAT according to claim 1, wherein the low rotational speeds include 0 to intermediate rotational speeds and the high rotational speeds include the intermediate to high rotational speeds.
6. A Ram Air Turbine (RAT), comprising:
a turbine hub having an end plate and a nose cone attached thereto at trailing and leading ends, respectively;
a governor shaft, to which turbine blades are connected, which is coupled to the end plate and supported within the nose cone to be rotatable with the turbine blades about a central axis thereof and axially movable from a first position relative to the turbine hub to a second position relative to the turbine hub; and
a hub assembly operably coupled to the turbine hub, the governor shaft and the turbine blades whereby the hub assembly biases the governor shaft toward:
the first position at low rotational speeds such that the turbine blades assume a partial coarse pitch angle of about 30 degrees, and
the second position at high rotational speeds such that the turbine blades assume a fine pitch angle, wherein the hub assembly comprises guide pins coupled to the yoke plate to axially move with the governor shaft.
7. The RAT according to claim 1, wherein the hub assembly comprises a flyweight, which is rotatable about a pivot pin to affect a pitch angle of the turbine blades at predefined rotational speeds between the low and high rotational speeds.
8. The RAT according to claim 1, wherein the hub assembly comprises a cam follower, which is movable to change a pitch angle of the turbine blades at predefined rotational speeds between the low and high rotational speeds.
9. A Ram Air Turbine (RAT), comprising:
a turbine hub having an end plate and a nose cone attached thereto at trailing and leading ends, respectively, the nose cone being formed to define a recess therein;
a governor shaft, to which turbine blades are connected, which is coupled to the end plate and supported within the nose cone recess to be rotatable with the turbine blades about a central axis thereof and axially movable from a first position relative to the turbine hub to a second position relative to the turbine hub; and
a hub assembly operably coupled to the turbine hub, the governor shaft and the turbine blades whereby the hub assembly biases the governor shaft toward:
the first position at low rotational speeds such that the turbine blades assume a partial coarse pitch angle of about 30 degrees, and
the second position at high rotational speeds such that the turbine blades assume a fine pitch angle,
wherein the nose cone comprises a body having an aft facing surface, the body and the aft facing surface defining the recess as a forwardly extending recess from the aft facing surface at the central axis, and
wherein the hub assembly comprises a shaft spring anchored to the end plate to apply bias to the governor shaft and a plurality of governor springs anchored to a forward spring seat disposed aft of a leading edge of the governor shaft.
10. The RAT according to claim 9, wherein the turbine blades assume about a 9 degree fine pitch angle.
11. The RAT according to claim 9, wherein the low rotational speeds include 0 to intermediate rotational speeds and the high rotational speeds include the intermediate to high rotational speeds.
12. A Ram Air Turbine (RAT), comprising:
a turbine hub having an end plate and a nose cone attached thereto at trailing and leading ends, respectively;
a governor shaft, to which turbine blades are connected, which is coupled to the end plate and supported within the nose cone to be rotatable with the turbine blades about a central axis thereof and axially movable from a first position relative to the turbine hub to a second position relative to the turbine hub; and
a hub assembly operably coupled to the turbine hub, the governor shaft and the turbine blades whereby the hub assembly biases the governor shaft toward:
the first position at low rotational speeds such that the turbine blades assume a partial coarse pitch angle of about 30 degrees, and
the second position at high rotational speeds such that the turbine blades assume a fine pitch angle, wherein the hub assembly comprises guide pins coupled to the yoke plate to axially move with the governor shaft.
13. The RAT according to claim 9, wherein the hub assembly comprises a flyweight, which is rotatable about a pivot pin to affect a pitch angle of the turbine blades at predefined rotational speeds between the low and high rotational speeds.
14. The RAT according to claim 9, wherein the hub assembly comprises a cam follower, which is movable to change a pitch angle of the turbine blades at predefined rotational speeds between the low and high rotational speeds.
15. A Ram Air Turbine (RAT), comprising:
a turbine hub having an end plate and a nose cone attached thereto at trailing and leading ends, respectively;
a governor shaft with a yoke plate attached thereto, to which turbine blades are connected such that the turbine blades extend in and are rotatable about a radial dimension, the governor shaft being coupled to the end plate and supported within the nose cone to be rotatable with the turbine blades about a central axis thereof and axially movable from a first position relative to the turbine hub to a second position;
a seat member biased toward the yoke plate to constrain a cam follower between the yoke plate and the seat member; and
a hub assembly comprising a shaft spring and governor springs anchored to aft and forward portions of the turbine hub, respectively, and to the governor shaft whereby the hub assembly biases the governor shaft toward:
the first position at low rotational speeds such that the cam follower is positioned at a first cam follower position and the turbine blades assume a partial coarse pitch angle of about 30 degrees, and
the second position at high rotational speeds such that the cam follower is positioned at a second cam follower position and the turbine blades assume a fine pitch angle,
wherein a leading edge of the governor shaft is positioned forward of an anchoring of the governor springs to the forward portion of the turbine hub.
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 semiconductor integrated circuit device used in a mobile communication system, the device comprising:
a base band processing unit for controlling a wireless communication base band processing;
a first system processing unit for controlling the mobile communication system except the base band processing; and
a second system processing unit for controlling image and voice processings,
wherein the base band processing unit, the first system processing unit and the second system processing unit are provided on one semiconductor chip.
2. The semiconductor integrated circuit device according to claim 1,
wherein the base band processing unit executes base band processings in a GSM method and a WCDMA method.
3. The semiconductor integrated circuit device according to claim 1, further comprising a bus bridge for connecting a first bus to which the first system processing unit is connected and a second bus to which the second system processing unit is connected,
wherein the first system processing unit and the second system processing unit can be communicated with each other by the bus bridge, and
the first system processing unit and the second system processing unit have a common memory address space.
4. The semiconductor integrated circuit device according to claim 1,
wherein the base band processing unit has an independent memory address space other than the memory address space held in common by the first system processing unit and the second system processing unit.
5. The semiconductor integrated circuit device according to claim 4,
wherein the memory address space held by the base band processing unit is provided with an access window capable of accessing to an arbitrary memory address space held in common by the first system processing unit and the second system processing unit, and
the memory address space held in common by the first system processing unit and the second system processing unit is provided with an access window capable of accessing to an arbitrary memory address space held by the base band processing unit.
6. The semiconductor integrated circuit device according to claim 1, further comprising:
a first interface connected between an interruption controller for executing interruption control of the base band processing unit and an interruption controller for executing interruption control of the first system processing unit; and
a second interface connected between the interruption controller for executing the interruption control of the first system processing unit and an interruption controller for executing interruption control of the second system processing unit,
wherein an interruption request to each other via the first interface is made in the base band processing unit and the first system processing unit, and an interruption request to each other via the second interface is made in the first system processing unit and the second system processing unit.
7. The semiconductor integrated circuit device according to claim 1,
wherein the first system processing unit has a first central processing unit and executes a first OS,
the second system processing unit has a second central processing unit and executes a second OS,
the base band processing unit has a third central processing unit,
the first and second system processing units and the base band processing unit each have different memory address spaces, and
the base band processing unit executes base band processings in a GSM method and a WCDMA method.