Multi-position camshaft phaser with two one-way wedge clutches and viscous damping

Patent metadata

Field	Value
Publication number	US-9879573-B2
Application number	US-201615085503-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Mar 30, 2016
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

A camshaft phaser, including: a stator including radially inwardly extending protrusions with radially outermost ends; a rotor including radially outwardly extending protrusions radially outermost ends; chambers at least partially bounded by a inwardly extending protrusion and an outwardly extending protrusion; first seals disposed in the radially innermost ends and facing the rotor; second seals disposed in the radially outermost ends and facing the stator; first and second wedge plates radially disposed between the rotor and the stator; and a displacement assembly arranged to for an advance mode, displace the first wedge plate to enable rotation of the rotor, with respect to the stator, in the first circumferential direction and for a retard mode, displace the second wedge plate to enable rotation of the rotor, with respect to the stator, in a second circumferential direction opposite the first circumferential direction.

First claim

What is claimed is:

1. A camshaft phaser, comprising:
a stator arranged to receive torque from an engine and including a plurality of radially inwardly extending protrusions, each radially inwardly extending protrusion including a radially outermost end; a rotor arranged to be non-rotatably connected to a camshaft and including a plurality of radially outwardly extending protrusions, each radially outwardly extending protrusion including a radially outermost end;
a plurality of chambers, each chamber at least partially bounded by a respective radially inwardly extending protrusion and a respective radially outwardly extending protrusion circumferentially adjacent to the radially inwardly extending protrusion;
a first plurality of seals, each seal in the first plurality of seals disposed in a respective radially innermost end and facing the rotor in a first radial direction;
a second plurality of seals, each seal in the second plurality of seals disposed in a respective radially outermost end and facing the stator in a second radial direction opposite the first radial direction;
first and second wedge plates radially disposed between the rotor and the stator; and,
a displacement assembly arranged to:
for an advance mode, displace the first wedge plate to enable rotation of the rotor, with respect to the stator, in the first circumferential direction; and,
for a retard mode, displace the second wedge plate to enable rotation of the rotor, with respect to the stator, in a second circumferential direction opposite the first circumferential direction.

2. The camshaft phaser of claim 1 , wherein:
said each seal in the first plurality of seals is separated, in the first radial direction, from the rotor by a first distance;
each radially innermost end is separated, in the first radial direction, from the rotor by a second distance greater than the first distance;
said each seal in the second plurality of seals is separated, in the second radial direction, from the stator by a third distance; and,
each radially outermost end is separated, in the second radial direction, from the stator by a fourth distance greater than the third distance.

3. The camshaft phaser of claim 1 , further comprising:
respective fluid in said each chamber, wherein:
said each seal in the first plurality of seals prevents flow of the respective fluid between the rotor and the respective radially inwardly extending protrusion; and,
said each seal in the second plurality of seals prevents flow of the respective fluid between the stator and a respective radially inwardly extending protrusion.

4. The camshaft phaser of claim 1 , further comprising:
respective fluid in said each chamber, wherein:
said each seal in the first plurality of seals restricts flow of the respective fluid between the rotor and the respective radially inwardly extending protrusion; and,
said each seal in the second plurality of seals restricts flow of the respective fluid between the stator and a respective radially inwardly extending protrusion.

5. The camshaft phaser of claim 1 , further comprising:
a plurality of channels through the rotor, each channel leading to a respective chamber; and,
a respective check valve between said each channel and the respective chamber.

6. The camshaft phaser of claim 5 , wherein:
the plurality of channels are arranged to receive pressurized fluid at a first pressure; and,
each respective check valve is arranged to open to enable flow of the pressurized fluid into the respective chamber for pressure of the respective fluid less than the first pressure.

7. The camshaft phaser of claim 1 , further comprising:
a cover plate fixedly secured to an axial end of the stator; and,
a resilient element axially disposed between the cover and the rotor and in contact with the cover and the rotor.

8. The camshaft phaser of claim 7 , wherein the resilient element reacts against the cover and the rotor to oppose rotation of the rotor with respect to the stator.

9. The camshaft phaser of claim 1 , wherein:
for the advance mode, the displacement assembly is arranged to displace the first wedge plate in the first circumferential direction to enable rotation of the rotor, with respect to the stator, in the first circumferential direction; and,
for the retard mode, the displacement assembly is arranged to displace the second wedge plate in the second circumferential direction to enable rotation of the rotor, with respect to the stator, in the second circumferential direction.

10. The camshaft phaser of claim 9 , wherein:
to block rotation of the rotor, with respect to the stator, in the second circumferential direction, the displacement assembly is arranged to non-rotatably connect the rotor, the second wedge plate, and the stator; and,
to block rotation of the rotor, with respect to the stator, in the first circumferential direction, the displacement assembly is arranged to non-rotatably connect the rotor, the first wedge plate, and the stator.

11. The camshaft phaser of claim 1 , wherein:
the rotor includes first and second pluralities of ramps, respectively;
the first and second wedge plates include third and fourth pluralities of ramps engaged with the third and fourth pluralities of ramps, respectively;
for the advance mode:
the first plurality of ramps are arranged to slide along the third plurality of ramps in the first circumferential direction; and,
the displacement assembly is arranged to slide the fourth plurality of ramps along the second plurality of ramps in the first circumferential direction; and,

for the retard mode:
the second plurality of ramps are arranged to slide along the fourth plurality of ramps in the second circumferential direction; and,
the displacement assembly is arranged to slide the third plurality of ramps along the first plurality of ramps in the second circumferential direction.

12. A camshaft phaser, comprising:
a stator arranged to receive torque from an engine and including a plurality of radially inwardly extending protrusions;
a rotor arranged to be non-rotatably connected to a camshaft and including a plurality of radially outwardly extending protrusions;
a plurality of chambers, each chamber at least partially bounded by a respective radially inwardly extending protrusion and a respective radially outwardly extending protrusion circumferentially adjacent to the radially inwardly extending protrusion;
a plurality of channels through the rotor, each channel leading to a respective chamber;
a respective check valve between said each channel and the respective chamber;
a first plurality of seals, each seal in the first plurality of seals radially disposed between the rotor and a respective radially inwardly extending protrusion;
a second plurality of seals, each seal in the second plurality of seals radially disposed between the stator and a respective radially outwardly extending protrusion;
first and second wedge plates radially disposed between the rotor and the stator; and,
a displacement assembly arranged to:
for an advance mode, displace the first wedge plate to enable rotation of the rotor, with respect to the stator, in a first circumferential direction; and,
for a retard mode, displace the second wedge plate to enable rotation of the rotor, with respect to the stator, in a second circumferential direction opposite the first circumferential direction.

13. The camshaft phaser of claim 12 , further comprising:
respective fluid in said each chamber, wherein:
said each seal in the first plurality of seals restricts flow, in a circumferential direction, of the respective fluid between the

Assignees

• Schaeffler Technologies Ag

Inventors

• Manther Debora
• Stallmann John
• George Philip

Classifications

• F01L2001/34423

  Details relating to the hydraulic feeding circuit · CPC title

• F01L2001/34479

  Sealing of phaser devices · CPC title

• F01L1/34409

  by torque-responsive means · CPC title

• F01L2001/34463

  Locking position intermediate between most retarded and most advanced positions · CPC title

• F01L1/3442 Primary

  using hydraulic chambers with variable volume to transmit the rotating force · CPC title