1. An engine valve actuation assembly comprising:
a shaft adapted to be coupled to an engine structure and defining a shaft bore;
a rocker arm rotationally supported on an outer surface of the shaft and including:
a first arm adapted to engage a first lobe of a camshaft and a first engine valve and defining a first longitudinal bore; and
a second arm adjacent the first arm, adapted to engage a second lobe of the camshaft and defining a second longitudinal bore;
a locking assembly including a first lock pin located within the first longitudinal bore, an actuation pin extending through a radial passage in the rocker arm and engaged with the first lock pin, and a first biasing member engaged with the first lock pin and urging the first lock pin toward the actuation pin and biasing the actuation pin radially inward; and
an actuation assembly located in the shaft bore and including an actuation member supported on an actuation rod, engaged with the actuation pin and linearly displaceable between first and second actuation positions, the first and second arms being rotatable relative to one another when the actuation member is in the first actuation position and being fixed for rotation with one another by the first lock pin when the actuation member is in the second actuation position.
2. The valve actuation assembly of claim 1, wherein the first lock pin is located within the first and second longitudinal bores when the actuation member is in the second actuation position to fix the first and second arms for rotation with one another.
3. The valve actuation assembly of claim 2, wherein the rocker arm includes a third arm adapted to engage a third cam lobe on the camshaft and a second engine valve and defining a third longitudinal bore, the first biasing member being located in the third longitudinal bore and the locking assembly including a second lock pin located within the second and third longitudinal bores and fixing the second and third arms for rotation with one another when the actuation member is in the second actuation position.
4. The valve actuation assembly of claim 1, wherein the locking assembly is displaceable between first and second lock positions by the actuation assembly, the first biasing member displacing the actuation pin to the first lock position when the actuation member is in the first actuation position and the actuation member forcing the actuation pin to the second lock position when the actuation member is in the second actuation position, the actuation pin being located radially outward when in the second lock position relative to the first lock position.
5. The valve actuation assembly of claim 1, wherein the actuation member is slidably disposed on the actuation rod.
6. The valve actuation assembly of claim 5, wherein the actuation assembly includes first and second stop members fixed for axial displacement with the rod on opposite ends of the actuation member and a biasing member located axially between the first and second stop members and engaged with the actuation member.
7. The valve actuation assembly of claim 1, wherein the actuation pin is perpendicular to the first lock pin.
8. The valve actuation assembly of claim 7, wherein the actuation pin and the first lock pin include angled surfaces abutting one another and providing axial displacement of the first lock pin via radial displacement of the actuation pin.
9. The valve actuation assembly of claim 1, wherein the shaft bore and the first and second longitudinal bores are parallel to a rotational axis of the camshaft.
10. An engine assembly comprising:
an engine structure;
a camshaft rotationally supported on the engine structure, defining a longitudinally extending rotational axis and including first and second lobes;
a shaft fixed to the engine structure and defining a shaft bore;
a rocker arm rotationally supported on an outer surface of the shaft and including:
a first arm engaged with the first lobe of the camshaft and a first engine valve and defining a first longitudinal bore; and
a second arm adjacent the first arm, engaged with the second lobe of the camshaft and defining a second longitudinal bore;
a locking assembly including a first lock pin located within the first longitudinal bore, an actuation pin extending through a radial passage in the rocker arm and engaged with the first lock pin, and a first biasing member engaged with the first lock pin and urging the first lock pin toward the actuation pin and biasing the actuation pin radially inward; and
an actuation assembly located in the shaft bore and including an actuation member supported on an actuation rod, engaged with the actuation pin and linearly displaceable between first and second actuation positions, the first and second arms being rotatable relative to one another when the actuation member is in the first actuation position and being fixed for rotation with one another by the first lock pin when the actuation member is in the second actuation position.
11. The engine assembly of claim 10, wherein the first lock pin is located within the first and second longitudinal bores when the actuation member is in the second actuation position to fix the first and second arms for rotation with one another.
12. The engine assembly of claim 10, wherein the locking assembly is displaceable between first and second lock positions by the actuation assembly, the first biasing member displacing the actuation pin to the first lock position when the actuation member is in the first actuation position, and the actuation member forcing the actuation pin to the second lock position when the actuation member is in the second actuation position, the actuation pin being located radially outward when in the second lock position relative to the first lock position.
13. The engine assembly of claim 10, wherein the actuation member is slidably disposed on the actuation rod.
14. The engine assembly of claim 13, wherein the actuation assembly includes first and second stop members fixed for axial displacement with the rod on opposite ends of the actuation member and a biasing member located axially between the first and second stop members and engaged with the actuation member.
15. The engine assembly of claim 10, wherein the actuation pin is perpendicular to the first lock pin.
16. The engine assembly of claim 15, wherein the actuation pin and the first lock pin include angled surfaces abutting one another and providing axial displacement of the first lock pin via radial displacement of the actuation pin.
17. The engine assembly of claim 10, wherein the shaft bore and the first and second longitudinal bores are parallel to a rotational axis of the camshaft.
18. An engine assembly comprising:
an engine structure;
a camshaft rotationally supported on the engine structure, defining a longitudinally extending rotational axis and including first and second lobes;
a shaft fixed to the engine structure and defining a shaft bore;
a rocker arm rotationally supported on an outer surface of the shaft and including:
a first arm engaged with the first lobe of the camshaft and a first engine valve and defining a first longitudinal bore;
a second arm engaged with the second lobe of the camshaft and defining a second longitudinal bore; and
a third arm engaged with a third cam lobe on the camshaft and a second engine valve and defining a third longitudinal bore, the second arm located between the first and third arms;
a locking assembly including a first lock pin located within the first longitudinal bore, a second lock pin located in the second longitudinal bore, an actuation pin extending through a radial passage in the rocker arm and engaged with the first lock pin, and a first biasing member located in the third longitudinal bore, the first biasing member engaged with the first lock pin and urging the first lock pin toward the actuation pin and biasing the actuation pin radially inward; and
an actuation assembly located in the shaft bore and including an actuation member supported on an actuation rod, engaged with the actuation pin and linearly displaceable between first and second actuation positions, the first and third arms being rotatable relative to the second arm when the actuation member is in the first actuation position, the first lock pin being located within the first and second longitudinal bores and the second lock pin being located within the second and third longitudinal bores when the actuation member is in the second actuation position to fix the first, second and third arms for rotation with one another.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A pulse width modulation (PWM) compressor, comprising:
a motor;
a first motor controller for supplying first level power to said motor during a loading operation of said compressor; and
a second motor controller for supplying second level power less than said first level power to said motor during an unloading operation of said compressor.
2. The PWM compressor according to claim 1, wherein said second motor controller comprises restricting means for restricting alternating current (AC) power.
3. The PWM compressor according to claim 2, wherein said restricting means restricts said AC power by reducing a voltage of said AC power.
4. The PWM compressor according to claim 3, wherein said restricting means is comprised of a switch and a reactor which are disposed between said AC power and said motor while being connected in series with each other.
5. The PWM compressor according to claim 4, wherein said reactor is a coil.
6. A compressor having operation cycles including a loading operation and an unloading operation, comprising:
a motor for receiving first level power during said loading operation of said compressor and receiving second level power less than said first level power during said unloading operation of said compressor.
7. An air conditioning unit, comprising:
a compressor for performing a loading operation and an unloading operation and compressing a cooling agent during said loading operation, said compressor including a motor for receiving first level power during said loading operation of said compressor and receiving second level power less than said first level power during said unloading operation.
8. The air conditioning unit according to claim 7, wherein said second level power is minimal power required to operate said compressor.
9. A method of operating a compressor in an air conditioning unit, said compressor having a loading operation for compressing a cooling agent and an unloading operation, comprising the steps of:
supplying first level power to a motor of said compressor during said loading operation; and
supplying second level power less than said first level power to said motor during said unloading operation.
10. An air conditioning unit comprising:
a compressor having a loading operation for compressing a cooling agent and an unloading operation; and
a controller for controlling said compressor, said controller comprising,
a power level control circuit for controlling power level supplied to a motor of said compressor, said power level control circuit allowing first level power to be supplied to said motor during said loading operation and allowing second level power less than said first level power to be supplied to said motor during said unloading operation.
11. The air conditioning unit according to claim 10, wherein said power level control circuit comprises restricting means for restricting alternating current (AC) power.
12. The air conditioning unit according to claim 11, wherein said restricting means restricts said AC power by reducing a voltage and a frequency of said AC power.
13. The air conditioning unit according to claim 12, wherein said restricting means is comprised of a converting unit for converting said AC power into direct current (DC) power, and an inverting unit for inverting the DC power into AC power and reducing the voltage and frequency of said AC power to be supplied to said motor of said compressor.