Clearance control swash plate device and single-shaft two-speed drive system with friction clutch applied thereto

A clearance control swash plate device comprising:

• an action plate mounted on a power transfer shaft;
• a first thrust bearing disposed on a rear surface of the action plate, and configured to prevent rotation force, received from the action plate, from being transferred;
• a first clearance swash plate disposed on a rear surface of the first thrust bearing;
• a second clearance swash plate disposed on a rear surface of the first clearance swash plate;
• a worm engaged with a worm gear formed on a portion of an outer circumference of the second clearance swash plate;
• a second thrust bearing disposed on a rear surface of the second clearance swash plate, and configured to prevent rotation force, received from the second clearance swash plate, from being transferred;
• and
• a thrust washer disposed on a rear surface of the second thrust bearing;
• wherein the first clearance swash plate comprises a plurality of first swash surfaces configured to protrude from a surface thereof opposite to a surface thereof facing the first thrust bearing and inclined in one circumferential direction thereof;
• wherein the second clearance swash plate comprises a plurality of second swash surfaces configured to protrude from a surface thereof coming in contact with the first clearance swash plate and inclined in a remaining circumferential direction thereof opposite to the one circumferential direction in which the first swash surfaces are inclined;
• wherein the first swash surfaces of the first clearance swash plate and the second swash surfaces of the second clearance swash plate are disposed such that each of the first swash surfaces can come into contact with a corresponding one of the second swash surfaces;
• and
• wherein when the second clearance swash plate is rotated via the worm gear engaged with the rotated worm, the second swash surfaces of the second clearance swash plate push the first swash surfaces of the first clearance swash plate, the first thrust bearing and the action plate are pushed via the first pushed clearance swash plate, a location of the thrust washer is fastened, and the thrust washer sustains repulsive force generated when the second clearance swash plate pushes the first clearance swash plate, thereby fastening locations of the second clearance swash plate and the second thrust bearing.