Multi-positional camshaft phaser with two one-way wedge clutches and spring actuator

Patent metadata

Field	Value
Publication number	US-9869214-B2
Application number	US-201514978821-A
Country	US
Kind code	B2
Filing date	Dec 22, 2015
Priority date	Dec 22, 2015
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A camshaft phaser including a gear arranged to receive torque from an engine, a housing non-rotatably connected to the gear and arranged to connect to a camshaft and a phase adjustment assembly including first gear teeth, second gear teeth and a hub arranged to non-rotatably connect to the camshaft and including third gear teeth and a displacement assembly arranged to for an advance mode, displace the hub in a first axial direction so that the third gear teeth non-rotatably connect to the second gear teeth and the hub is rotatable with respect to the housing in a first circumferential direction and for a retard mode, displace the hub in a second axial direction, opposite the first axial direction, so that the third gear teeth non-rotatably connect to the first gear teeth and the hub is rotatable with respect to the housing in a second circumferential direction.

First claim

What is claimed is:

1. A camshaft phaser, comprising:
a gear arranged to receive torque from an engine;
a housing non-rotatably connected to the gear and arranged to connect to a camshaft; and,
a phase adjustment assembly including:
first gear teeth;
second gear teeth; and,
a hub arranged to non-rotatably connect to the camshaft and including third gear teeth; and,
a displacement assembly arranged to:
for an advance mode, displace the hub in a first axial direction so that:
the third gear teeth non-rotatably connect to the second gear teeth; and,
the hub is rotatable with respect to the housing in a first circumferential direction; and,

for a retard mode, displace the hub in a second axial direction, opposite the first axial direction, so that:
the third gear teeth non-rotatably connect to the first gear teeth; and,
the hub is rotatable with respect to the housing in a second circumferential direction opposite the first circumferential direction.

2. The camshaft phaser of claim 1 , wherein:
for the advance mode, the hub is non-rotatable with respect to the housing in the second circumferential direction; and,
for the retard mode, the hub is non-rotatable with respect to the housing in the first circumferential direction.

3. The camshaft phaser of claim 1 , wherein the displacement assembly is arranged to:
for a drive mode, displace the hub axially so that:
the third gear teeth non-rotatably connect to the first and second gear teeth; and,
the hub is non-rotatable with respect to the housing.

4. The camshaft phaser of claim 3 , wherein the displacement assembly includes:
a first resilient element urging the hub in the first axial direction;
a second resilient element urging the hub in the second axial direction; and,
an actuator engaged with the second resilient element and arranged to:
displace a portion of the second resilient element to a first position such that the first resilient element urges the third gear teeth into non-rotatable connection with one of the first or second gear teeth;
displace the portion of the second resilient element to a second position such that the first and second resilient elements urge the third gear teeth into non-rotatable connection with the first and second gear teeth; and,
displace the portion of the second resilient element to a third position such that the second resilient element urges the third gear teeth into non-rotatable connection with the other of the first or second gear teeth.

5. The camshaft phaser of claim 4 , wherein:
the second resilient element urges the hub in the second axial direction with a first force;
in the first position, the first resilient element urges the hub in the first axial direction with a second force greater than the first force; and,
in the second position, the first resilient element urges the hub in the first axial direction with a third force less than the second force.

6. The camshaft phaser of claim 1 , wherein the displacement assembly includes:
a first resilient element urging the hub in the first axial direction; and,
a second resilient element urging the hub in the second axial direction.

7. The camshaft phaser of claim 6 , wherein the first resilient element is a diaphragm spring.

8. The camshaft phaser of claim 7 , wherein the diaphragm spring is pivotably supported on the housing.

9. The camshaft phaser of claim 1 , wherein:
the phase adjustment assembly includes first and second one-way clutches;
the first one-way clutch includes the first gear teeth; and,
the second one-way clutch includes the second gear teeth.

10. The camshaft phaser of claim 9 , wherein:
the first one-way clutch includes:
a first inner race including the first gear teeth; and,
a first outer race non-rotatably connected to the housing; and,

the second one-way clutch includes:
a second inner race including the second gear teeth; and,
a second outer race non-rotatably connected to the housing.

11. A camshaft phaser, comprising:
a gear arranged to receive torque from an engine;
a housing non-rotatably connected to the gear and arranged to connect to a camshaft;
a phase adjustment assembly including:
an advance one-way clutch non-rotatably connected to the housing and including first gear teeth;
a retard one-way clutch non-rotatably connected to the housing and including second gear teeth; and,
a hub arranged to non-rotatably connect to the camshaft and including third gear teeth; and,
a displacement assembly arranged to:
for an advance mode, displace the hub in a first axial direction so that:
the third gear teeth non-rotatably connect to the second gear teeth; and,
the hub is rotatable with respect to the housing in a first circumferential direction; and,

for a retard mode, displace the hub in a second axial direction, opposite the first axial direction, so that:
the third gear teeth non-rotatably connect to the first gear teeth; and,
the hub is rotatable with respect to the housing in a second circumferential direction, opposite the first circumferential direction.

12. The camshaft phaser of claim 11 , wherein the displacement assembly is arranged to:
for a drive mode, displace the hub axially so that:
the third gear teeth non-rotatably connect to the first and second gear teeth; and,
the hub is non-rotatable with respect to the housing.

13. The camshaft phaser of claim 11 , wherein:
for the advance mode, the hub is non-rotatable with respect to the housing in the second circumferential direction; and,
for the retard mode, the hub is non-rotatable with respect to the housing in the first circumferential direction.

14. The camshaft phaser of claim 12 , wherein the displacement assembly includes:
a first resilient element urging the hub in the first axial direction;
a second resilient element urging the hub in the second axial direction; and,
an actuator engaged with the second resilient element and arranged to:
displace a portion of the second resilient element to a first position such that the first resilient element urges the third gear teeth into non-rotatable connection with one of the first or second gear teeth;
displace the portion of the second resilient element to a second position such that the first and second resilient elements urge the third gear teeth into non-rotatable connection with the first and second gear teeth; and,
displace the portion of the second resilient element to a third position such that the second resilient element urges the third gear teeth into non-rotatable connection with the other of the first or second gear teeth.

15. The camshaft phaser of claim 14 , wherein:
the second resilient element urges the hub in the second axial direction with a first force;
in the first position, the first resilient element urges the hub in the first axial direction with a second force greater than the first force; and,
in the second position, the first resilient element urges the hub in the first axial direction with a third force less than the second force.

16. The camshaft phaser of claim 14 , wherein the first resilient element is a diaphragm spring.

17. The camshaft phaser of claim 16 , wherein the diaphragm spring is pivotably supported on the housing.

18. The camshaft phaser of claim 14 , wherein the second resilient element is a spring applying a constant force on the hub.

19. The camshaft phaser of claim 18 , wherein the spring is supported on the housing.

20. A method of phasing a camshaft, comprising:
receiving,

Assignees

• Schaeffler Technologies Ag

Inventors

• Berndt Eric

Classifications

• F01L1/34409

  by torque-responsive means · CPC title

• F01L2820/031

  Electromagnets · CPC title

• F01L1/34406 Primary

  the helically teethed sleeve being located in the camshaft driving pulley · CPC title

• F01L2820/03

  Auxiliary actuators · CPC title

• F01L1/047

  Camshafts · CPC title