Multi-position camshaft phaser with two one-way clutches

Abstract

A camshaft phaser, including an input component receiving torque from an engine, an advance hub, an advance wedge plate radially between the input component and advance hub, and an actuation assembly including an advance shoe arranged in a channel in a camshaft and an actuator pin. For an advance mode, the actuator pin can radially displace the advance shoe into non-rotatable connection with the advance hub, the advance hub is arranged to rotate, with respect to the input component, in a first circumferential direction, and the advance wedge plate is arranged to block rotation of the advance hub, with respect to the input component, in a second circumferential direction, opposite the first circumferential direction. Components permitting operation in a phase retard mode where retard shoes are in non-rotatable connection with a retard hub and a drive mode where the advance and retard shoes are both in contact with their hubs.

What is claimed is: 
     
         1 . A camshaft phaser, comprising:
 an input component arranged to receive torque from an engine;   an advance hub;   an advance wedge plate radially disposed between the input component and the advance hub; and,   an actuation assembly including:
 an advance shoe arranged to be disposed in an advance channel for a camshaft; and, 
 an actuator pin, arranged to radially displace the advance shoe into non-rotatable frictional contact with the advance hub, the advance hub arranged to rotate with respect to the input component, in a first circumferential direction, the advance wedge plate arranged to block rotation of the advance hub, with respect to the input component, in a second circumferential direction, opposite the first circumferential direction in an advance mode. 
   
     
     
         2 . The camshaft phaser recited in  claim 1 , wherein:
 the advance hub includes a first plurality of ramps extending radially outward along the first circumferential direction;   the advance wedge plate includes a second plurality of ramps extending radially inward along the second circumferential direction and engaged with the first plurality of ramps; and,   the first and second pluralities of ramps are arranged to displace the advance wedge plate radially outward to non-rotatably connect the input component, the advance wedge plate, and the advance hub, in the second circumferential direction, in the advance mode.   
     
     
         3 . The shaft phaser recited in  claim 1 , further comprising:
 a retard hub; and,   a retard wedge plate radially disposed between the input component and the retard hub, wherein the actuation assembly includes a retard shoe arranged to be disposed in a retard channel for the camshaft, the actuator pin is arranged to radially displace the retard shoe into non-rotatable frictional contact with the retard hub, the retard hub is arranged to rotate, with respect to the input component, in the second circumferential direction, and, the retard wedge plate is arranged to block rotation of the retard hub, with respect to the input component, in the first circumferential direction, in a retard mode.   
     
     
         4 . The camshaft phaser recited in  claim 3 , wherein the retard hub includes a first plurality of ramps extending radially outward along the second circumferential direction, the retard wedge plate includes a second plurality of ramps extending radially inward along the first circumferential direction and engaged with the first plurality of ramps, and, the first and second pluralities of ramps are arranged to displace the retard wedge plate radially outward to non-rotatably connect the input component, the retard wedge plate, and the advance hub, for rotation of the camshaft, with respect to the input component, in the first circumferential direction in the retard mode. 
     
     
         5 . The camshaft phaser recited in  claim 3 , wherein the retard hub is rotatable with respect to the retard shoe or the input component in the advance mode, and the advance hub is rotatable with respect to the advance shoe or the input component in the retard mode. 
     
     
         6 . The camshaft phaser recited in  claim 3 , wherein the actuator pin includes first and second portions having first and second outer radii, respectively, and a third portion having a third outer radius greater than the first and second radii, respectively, wherein the actuator pin is displaceable so that the third and second portions directly engage the advance and retard shoes, respectively, in the advance mode, and the actuator pin is displaceable so that the first and third portions directly engage the advance and retard shoes, respectively, in the retard mode. 
     
     
         7 . The camshaft phaser recited in  claim 6  wherein the camshaft includes at least one slot having first and second ends and the phaser includes at least one stop pin non-rotatably connected to the phaser and disposed in said at least one slot such that each stop pin in each respective slot act as stops for rotation of the camshaft with respect to the input component. 
     
     
         8 . The camshaft phaser recited in  claim 7 , wherein for a drive mode:
 the actuator pin is displaceable so that the third portion directly engages the advance and retard shoes;   the advance and retard shoes are in non-rotatable frictional contact with the advance and retard hubs, respectively, and,   the advance and retard hubs each transmit torque from the input component.   
     
     
         9 . The camshaft phaser recited in  claim 8 , wherein:
 the input component is arranged to rotate in the first circumferential direction;   the camshaft is arranged to rotate with respect to the input component in the first and second circumferential directions during first and second alternating time periods;   the retard hub is arranged to transmit torque from the input component to the camshaft during the first time period in the drive mode; and,   the advance hub is arranged to transmit torque from the input component to the camshaft during the second time period in the drive mode.   
     
     
         10 . A camshaft phaser, comprising:
 a camshaft including an advance channel and a retard channel; and,   a camshaft phaser including:
 an advance hub; 
 a retard hub; and, 
 an actuation assembly including:
 an advance shoe disposed in the advance channel; 
 a retard shoe disposed in the retard channel; and, 
 an actuator pin, wherein:
 the actuator pin is arranged to radially displace the advance shoe into non-rotatable frictional contact with the advance hub, the camshaft is arranged to rotate, with respect to the input component, in a first circumferential direction, and the advance hub is arranged to block rotation of the camshaft, with respect to the input component, in a second circumferential direction, opposite the first circumferential direction, in an advance mode; and, 
 the actuator pin is arranged to radially displace the retard shoe into non-rotatable frictional contact with the retard hub, the camshaft is arranged to rotate, with respect to the input component, in the second circumferential direction, and the retard hub is arranged to block rotation of the camshaft, with respect to the input component in the first circumferential direction, in a retard mode. 
 
 
   
     
     
         11 . The camshaft phaser recited  claim 10 , wherein:
 the camshaft phaser includes an advance wedge plate radially disposed between the input component and the advance hub;   the advance hub includes a first plurality of ramps extending radially outward along the first circumferential direction;   the advance wedge plate includes a second plurality of ramps extending radially inward along the second circumferential direction and engaged with the first plurality of ramps; and,   the first and second pluralities of ramps are arranged to circumferentially displace with respect to each other to displace the advance wedge plate radially outward to non-rotatably connect the input component, the advance wedge plate, and the advance hub for rotation of the camshaft, with respect to the input component, in the second circumferential direction, in the advance mode.   
     
     
         12 . The camshaft phaser recited  claim 10 , wherein:
 the camshaft phaser includes a retard wedge plate radially disposed between the input component and the retard hub;   the retard hub includes a first plurality of ramps extending radially outward along the second circumferential direction;   the retard wedge plate includes a second plurality of ramps extending radially inward in the first circumferential direction and engaged with the first plurality of ramps; and,   the first and second pluralities of ramps are arranged to circumferentially displace with respect to each other to displace the retard wedge plate radially outward to non-rotatably connect the input component, the retard wedge plate, and the retard hub for rotation of the camshaft, with respect to the input component, in the first circumferential direction, in the retard mode.   
     
     
         13 . The camshaft phaser recited in  claim 10 , wherein:
 the retard hub is rotatable with respect to the retard shoe or the input component, in the advance mod, and the advance hub is rotatable with respect to the advance shoe or the input component in the retard mode.   
     
     
         14 . The camshaft phaser recited in  claim 10 , wherein:
 the actuator pin includes:
 first and second portions having first and second outer radii, respectively; and, 
 a third portion having a third outer radius greater than the first and second radii, respectively; and, 
   the actuator pin is displaceable so that the third and second portions directly engage the advance and retard shoes, respectively, in the advance mode, and the actuator pin is displaceable so that the first and third portions directly engage the advance and retard shoes, respectively, in the retard mode.   
     
     
         15 . The camshaft phaser recited in  claim 14 , wherein for a drive mode:
 the actuator pin is displaceable so that the third portion directly engages the advance and retard shoes;   the advance and retard shoes are in non-rotatable frictional contact with the advance and retard hubs, respectively, and,   the advance and retard hubs each transmit torque from the input component to the camshaft.   
     
     
         16 . The camshaft phaser recited in  claim 15 , wherein:
 the input component is arranged to rotate in the first circumferential direction;   the camshaft is arranged to rotate with respect to the input component in the first and second circumferential directions during first and second alternating time periods;   the retard hub is arranged to transmit torque from the input component to the camshaft during the first time period in the drive mode; and,   the advance hub is arranged to transmit torque from the input component to the camshaft during the second time period in the drive mode.   
     
     
         17 . The camshaft phaser recited in  claim 10 , wherein the camshaft phaser includes:
 a first resilient element, for the advance shoe, arranged to displace the advance shoe radially away from friction contact with the advance hub in the retard mode, and   a second resilient element, for the retard shoe, arranged to displace the retard shoe radially away from the retard hub in the advance mode.   
     
     
         18 . A method of phasing a camshaft, comprising:
 receiving, using an input component for a camshaft phaser, torque from an input component from an engine;   radially displacing, with an actuator pin for an actuator assembly, an advance shoe into non-rotatable frictional contact with an advance hub for the camshaft phaser, the actuator pin being located in an advance channel in the camshaft, rotating the camshaft, with respect to the input component, in a first circumferential direction, and blocking, rotation of the camshaft, with the advance hub, with respect to the input component, in a second circumferential direction, opposite the first circumferential direction, in an advance mode; and,   axially displacing the actuator pin; radially displacing, with the actuator pin, a retard shoe into non-rotatable frictional contact with a retard hub for the camshaft phaser, the retard shoe being located in a retard channel in the camshaft, rotating the camshaft, with respect to the input component, in a second circumferential direction, opposite the first circumferential direction, and, blocking, with the retard hub, rotation of the camshaft, with respect to the input component, in the first circumferential direction, in a retard mode.   
     
     
         19 . The method recited in  claim 18 , further comprising:
 engaging a first plurality of ramps, for the advance hub, extending radially outward along the first circumferential direction, with a second plurality of ramps for an advance wedge plate radially located between the input component and the advance hub, extending radially inward in the second circumferential direction;   circumferentially displacing the first and second pluralities of ramps with respect to each other for rotation of the camshaft, with respect to the input component, in the second circumferential direction; and,   displacing the advance wedge plate radially outward to non-rotatably connect the input component, the advance wedge plate, and the advance hub in the advance mode.   
     
     
         20 . The method recited in  claim 18 , further comprising:
 engaging a first plurality of ramps, for the retard hub, extending radially outward along the second circumferential direction with a second plurality of ramps, for a retard wedge plate radially located between the input component and the retard hub, extending radially inward in the first circumferential direction;   circumferentially displacing the first and second pluralities of ramps with respect to each other for rotation of the camshaft, with respect to the input component, in the second circumferential direction; and,   displacing the retard wedge plate radially outward to non-rotatably connect the input component, the retard wedge plate, and the retard hub in the retard mode.