Compressor with transmission

Abstract

A compressor with a transmission includes a clutch that varies the rotational speed of an output shaft between two different speeds. The clutch includes a friction layer, which secures a ring roller by movement of the ring roller in a first direction (securing direction), a first control chamber, a first control piston accommodated in the first control chamber and movable in the direction of an input shaft axis, a first thrust bearing between the first control piston and the ring roller, a second control chamber facing the first control chamber, a second control piston accommodated in the second control chamber and movable in the direction of the axis), a second thrust bearing between the second control piston and the ring roller, and a pressure control mechanism, which controls a first control pressure supplied to the first control chamber and a second control pressure supplied to the second control chamber.

1 . A compressor with a transmission, comprising:
 a housing;   a compression mechanism formed in the housing and being capable of compressing refrigerant;   an input shaft extending into the housing from the outside of the housing, the input shaft being supported to be rotational about an axis;   an output shaft extending in the housing, the output shaft being supported to be rotational about the axis and being capable of driving the compression mechanism;   a transmission mechanism located between the input shaft and the output shaft in the housing, the transmission mechanism being capable of driving the compression mechanism at two different speeds by transmitting torque of the input shaft to the output shaft and also transmitting the rotational speed of the input shaft to the output shaft at an equal speed or an increased speed; and   a control mechanism for controlling the transmission mechanism, wherein   the transmission mechanism includes a planet roller mechanism having a sun roller, a plurality of planet rollers, a carrier, and a ring roller,   the carrier rotationally retains the planet rollers and is rotational integrally with the input shaft,   the sun roller engages with the planet rollers and is rotational integrally with the input shaft, and   the ring roller engages with the planet rollers and is secured to the housing by moving relative to the housing in a first direction parallel to the axis, and the ring roller is rotational with respect to the housing by moving relative to the housing in a second direction, which is opposite to the first direction,   wherein the control mechanism includes:   a one-way clutch arranged between the carrier and the ring roller, wherein the one-way clutch permits relative rotation of the carrier and the ring roller in one direction and restricts relative rotation in the other direction; and   a clutch arranged between the housing and the ring roller, the clutch selectively restricting and permitting rotation of the ring roller by engagement between the housing and the ring roller,   wherein the clutch includes:   a friction layer arranged between the housing and the ring roller, the friction layer securing the ring roller to the housing by movement of the ring roller in the first direction;   a first control chamber formed in the housing and open toward the ring roller;   a first control piston accommodated in the first control chamber and movable in the direction of the axis;   a first thrust bearing arranged between the first control piston and the ring roller;   a second control chamber formed in the housing, the second control chamber facing the first control chamber and open toward the ring roller;   a second control piston accommodated in the second control chamber and movable in the direction of the axis;   a second thrust bearing arranged between the second control piston and the ring roller; and   a pressure control mechanism for controlling a first control pressure supplied to the first control chamber and a second control pressure supplied to the second control chamber.   
     
     
         2 . The compressor with a transmission according to  claim 1 , wherein the housing includes a transmission chamber for accommodating the transmission mechanism, and a space in the transmission chamber is isolated from the refrigerant. 
     
     
         3 . The compressor with a transmission according to  claim 2 , wherein the first control piston has a first control pressure receiving area and the second control piston has a second control pressure receiving area, the second control pressure receiving area being set to be greater than the first control pressure receiving area, the first control pressure is one of a suction pressure of the refrigerant drawn into the compression mechanism and a discharge pressure generated by the compression mechanism, and the second control pressure is the suction pressure. 
     
     
         4 . The compressor with a transmission according to  claim 1 , wherein the first control piston and the second control piston each have an annular shape coaxial with the axis, the first control piston having an O-ring arranged between the first control piston and the first control chamber, and the second control piston having an O-ring arranged between the second control piston and the second control chamber.