Multi-position camshaft phaser with two one-way wedge clutches

Patent metadata

Field	Value
Publication number	US-9447709-B1
Application number	US-201514730468-A
Country	US
Kind code	B1
Filing date	Jun 4, 2015
Priority date	Jun 4, 2015
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A camshaft phaser, including a stator arranged to receive torque from an engine; a rotor arranged to be non-rotatably connected to a camshaft; first and second ramp rings radially disposed about the rotor and non-rotatably connected to the rotor; a first wedge plate radially disposed between the stator and the first ramp ring; a second wedge plate radially disposed between the stator and the second ramp ring; and a displacement assembly arranged to, for an advance mode, displace the first ramp ring in a first axial direction to enable rotation of the rotor, with respect to the stator, in a first circumferential direction, and for a retard mode, displace the second ramp ring in a second axial direction, opposite the first axial direction, 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;
a rotor arranged to be non-rotatably connected to a camshaft;
first and second ramp rings:
radially disposed about the rotor; and,
non-rotatably connected to the rotor;

a first wedge plate radially disposed between the stator and the first ramp ring;
a second wedge plate radially disposed between the stator and the second ramp ring; and,
a displacement assembly arranged to:
displace the first ramp ring in a first axial direction to enable rotation of the rotor, with respect to the stator, in a first circumferential direction, for an advance mode; and,
displace the second ramp ring in a second axial direction, opposite the first axial direction, to enable rotation of the rotor, with respect to the stator, in a second circumferential direction, opposite the first circumferential direction, for a retard mode.

2. The camshaft phaser of claim 1 , wherein:
the displacement assembly is arranged to displace the second ramp ring in the first axial direction to block rotation of the rotor, with respect to the stator, in the second circumferential direction, in the advance mode; and,
the displacement assembly is arranged to displace the first ramp ring in the second axial direction to block rotation of the rotor, with respect to the stator, in the first circumferential direction, in the retard mode.

3. The camshaft phaser of claim 1 , wherein:
the first ramp ring includes a first plurality of ramps;
the second ramp ring includes a second plurality of ramps;
the first and second wedge plates include third and fourth pluralities of ramps, respectively, engaged with the first and second pluralities of ramps, respectively;
the second plurality of ramps is arranged to slide along the fourth plurality of ramps in the second circumferential direction in the advance mode; and,
the first plurality of ramps is arranged to slide along the third plurality of ramps in the first circumferential direction in the retard mode.

4. The camshaft phaser of claim 3 , wherein:
each ramp in the first plurality of ramps includes a respective first portion sloping radially inward in the second axial direction;
each ramp in the second plurality of ramps includes a respective second portion sloping radially inward in the first axial direction:
for the advance mode, the displacement assembly is arranged to:
engage the first wedge plate with the respective first portions; and,
disengage the second wedge plate from the respective second portions; and,

for the retard mode, the displacement assembly is arranged to:
engage the second wedge plate with the respective second portions; and,
disengage the first wedge plate from the respective first portions.

5. The camshaft phaser of claim 3 , wherein:
each ramp in the first plurality of ramps includes a respective first portion sloping radially inward in the first axial direction;
each ramp in the second plurality of ramps includes a respective second portion sloping radially inward in the second axial direction:
for the advance mode, the displacement assembly is arranged to:
engage the first wedge plate with the respective first portions; and,
disengage the second wedge plate from the respective second portions; and,

for the retard mode, the displacement assembly is arranged to:
engage the second wedge plate with the respective second portions; and,
disengage the first wedge plate from the respective first portions.

6. The camshaft phaser of claim 1 , wherein:
the rotor includes a central portion axially disposed between the first and second ramp rings; and,
the first axial direction is from the central portion toward the first wedge plate and the second axial direction is from the central portion toward the second wedge plate; or,
the first axial direction is from the first wedge plate toward the central portion and the second axial direction is from the second wedge plate toward the central portion.

7. The camshaft phaser of claim 1 , wherein the displacement assembly includes:
a first resilient element arranged to displace the first ramp ring in the first axial direction; and,
a second resilient element arranged to displace the second ramp ring in the second axial direction.

8. The camshaft phaser of claim 7 , wherein:
the rotor includes:
a central opening through which an axis of rotation for the camshaft phaser passes; and,
a central portion of the rotor axially disposed between the first and second ramp rings;

the displacement assembly includes:
at least one first channel in the rotor:
with at least one first opening at the central opening and at least one second opening at the central portion; and,
arranged to receive pressurized fluid to displace the first ramp ring in the second axial direction; and,

at least one second channel in the rotor:
with at least one third opening at the central opening and at least one fourth opening at the central portion; and,
arranged to receive pressurized fluid to displace the second ramp ring in the first axial direction.

9. The camshaft phaser of claim 7 , wherein the first and second resilient elements are wave washers.

10. The camshaft phaser of claim 1 , wherein for a drive mode the displacement assembly is arranged to:
displace the second ramp ring in the first axial direction to block rotation of the rotor, with respect to the stator, in the second circumferential direction; and,
displace the first ramp ring in the second axial direction to block rotation of the rotor, with respect to the stator, in the first circumferential direction.

11. The camshaft phaser of claim 1 , wherein the displacement assembly includes:
a first resilient element arranged to displace the first ramp ring in the second axial direction; and,
a second resilient element arranged to displace the second ramp ring in the first axial direction.

12. The camshaft phaser of claim 11 , further comprising:
first and second side plates, wherein:
the first and second ramp rings are axially disposed between the first and second side plates;
the first resilient element is axially disposed between the first ramp ring and the first side plate; and,
the second resilient element is axially disposed between the second ramp ring and the second side plate.

13. The camshaft phaser of claim 12 , wherein:
the rotor includes:
a central opening through which an axis of rotation for the camshaft phaser passes; and,
a central portion of the rotor axially disposed between the first and second ramp rings;

the displacement assembly includes:
at least one first channel in the rotor:
with at least one first opening at the central opening and at least one second opening at the central portion; and,
arranged to receive pressurized fluid to displace the first ramp ring in the first axial direction; and,

at least one second channel in the rotor:
with at least one third opening at the central opening and at least one fourth opening at the central portion; and,
arranged to receive pressurized fluid to displace the second ramp ring in the second axial direction.

14. The camshaft phaser of claim 1 , wherein the displacement assembly includes:
a first magnetic actuator arranged to displace the first ramp ring in the first axial direction; and,
a second magnetic actuator arranged to displace the second ramp ring in the second axial direction.

15. The camshaft phaser of claim 1 , wherein:
the rotor is arranged to receive a plurality of torque cycles from the camshaft;
each torque cycle included in

Assignees

• Schaeffler Technologies Ag

Inventors

• Manther Debora

Classifications

• F01L1/34403

  using helically teethed sleeve or gear moving axially between crankshaft and camshaft · CPC title

• F01L2820/031

  Electromagnets · CPC title

• F01L1/34409 Primary

  by torque-responsive means · CPC title

• F01L1/3442

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

• F01L2001/34459

  Locking in multiple positions · CPC title