Variable camshaft phaser with cone clutches

Patent metadata

Field	Value
Publication number	US-9719382-B2
Application number	US-201514942549-A
Country	US
Kind code	B2
Filing date	Nov 16, 2015
Priority date	Nov 16, 2015
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A camshaft phaser, including: a housing; and a phase adjustment assembly including: first and second frusto-conical shaped surfaces arranged to non-rotatably connect to a camshaft, a first one-way clutch including a third frusto-conical shaped surface; a second one-way clutch including a fourth frusto-conical shaped surface; and a displacement assembly including: a first resilient element arranged to, for an advance mode, displace the first surface in a first axial direction to non-rotatably connect the first and third surfaces and enable the second surface to rotate with respect to the housing in a first circumferential direction; and a second resilient element arranged to, for a retard mode, displace the second surface in a second axial direction to non-rotatably connect the second and fourth surfaces and enable the first surface to rotate with respect to the housing in a second circumferential direction, opposite the first circumferential direction.

First claim

What is claimed is:

1. A camshaft phaser, comprising:
a housing arranged to receive torque from an engine; and,
a phase adjustment assembly including:
first and second frusto-conical shaped surfaces:
tapering in first and second opposite axial directions, respectively; and,
arranged to non-rotatably connect to a camshaft;

a first one-way clutch including:
a first outer race non-rotatably connected to the housing; and,
a first inner race including a third frusto-conical shaped surface; and,

a second one-way clutch including:
a second outer race non-rotatably connected to the housing; and,
a second inner race including a fourth frusto-conical shaped surface; and,

a displacement assembly including:
a first resilient element arranged to, for an advance mode, displace the first frusto-conical shaped surface in the first axial direction so that:
the first frusto-conical shaped surface non-rotatably connects to the third frusto-conical shaped surface; and,
the second frusto-conical shaped surface is rotatable with respect to the housing in a first circumferential direction; and,

a second resilient element arranged to, for a retard mode, displace the second frusto-conical shaped surface in the second axial direction so that:
the second frusto-conical shaped surface non-rotatably connects to the fourth frusto-conical shaped surface; and,
the first frusto-conical shaped surface 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 non-rotatable connection of the first and third frusto-conical shaped surfaces is arranged to block rotation of the first frusto-conical shaped surface, with respect to the housing, in the second circumferential direction; and,
for the retard mode, the non-rotatable connection of the second and fourth frusto-conical shaped surfaces is arranged to block rotation of the second frusto-conical shaped surface, with respect to the housing, in the first circumferential direction.

3. The camshaft phaser of claim 2 , wherein the first and second one-way clutches are axially fixed with respect to the housing.

4. The camshaft phaser of claim 1 , wherein the phase adjustment assembly includes a cone-clutch component:
arranged to non-rotatable connect to the camshaft; and,
including the first and second frusto-conical shaped surfaces.

5. The camshaft phaser of claim 1 , wherein the displacement assembly further comprises a linear actuator arranged to displace the second resilient element.

6. The camshaft phaser of claim 1 , wherein the second resilient element is a diaphragm spring.

7. The camshaft phaser of claim 1 , wherein:
the first and third frusto-conical shaped surface tapers radially outward in the first axial direction; and,
the second and fourth frusto-conical shaped surface tapers radially outward in the second axial direction.

8. The camshaft phaser of claim 1 , wherein:
the first and third frusto-conical shaped surfaces taper radially inward in first axial direction; and,
the second and fourth frusto-conical shaped surfaces taper radially inward in the second axial direction.

9. A camshaft phaser, comprising:
a housing arranged to receive torque from an engine; and,
a phase adjustment assembly including:
a first one-way clutch with a first frusto-conical shaped surface;
a second one-way clutch with a second frusto-conical shaped surface;
a cone-clutch component:
arranged to non-rotatably connect to the camshaft; and,
including third and fourth frusto-conical shaped surfaces; and,

a displacement assembly including:
a first resilient element arranged to, for an advance mode, displace the cone-clutch component in the first axial direction so that:
the first frusto-conical shaped surface non-rotatably connects to the third frusto-conical shaped surface; and,
the second frusto-conical shaped surface is rotatable with respect to the housing in a first circumferential direction; and,

a second resilient element arranged to, for a retard mode, displace the cone-clutch component in the second axial direction so that:
the second frusto-conical shaped surface non-rotatably connects to the fourth frusto-conical shaped surface; and,
the first frusto-conical shaped surface is rotatable with respect to the housing in a second circumferential direction, opposite the first circumferential direction.

10. The camshaft phaser of claim 9 , wherein the displacement assembly further comprises a linear actuator arranged to displace the second resilient element.

11. The camshaft phaser of claim 9 , wherein the second resilient element is a diaphragm spring.

12. The camshaft phaser of claim 9 , wherein:
the first and third frusto-conical shaped surfaces taper radially outward in first axial direction; and,
the second and fourth frusto-conical shaped surfaces taper radially outward in the second axial direction.

13. The camshaft phaser of claim 9 , wherein:
the first and third frusto-conical shaped surfaces taper radially inward in first axial direction; and,
the second and fourth frusto-conical shaped surfaces taper radially inward in the second axial direction.

14. The camshaft phaser of claim 9 , wherein:
for the advance mode, the non-rotatable connection of the first and third frusto-conical shaped surfaces is arranged to block rotation of the cone-clutch component, with respect to the housing, in the second circumferential direction; and,
for the retard mode, the non-rotatable connection of the second and fourth frusto-conical shaped surfaces is arranged to block rotation of the cone-clutch component, with respect to the housing, in the first circumferential direction.

15. The camshaft phaser of claim 9 , wherein:
the first one-way clutch includes:
a first outer race non-rotatably connected to the housing; and,
a first inner race including the first frusto-conical shaped surface; and,

the second one-way clutch includes:
a second outer race non-rotatably connected to the housing; and,
a second inner race including the second frusto-conical shaped surface.

16. The camshaft phaser of claim 15 , wherein the first and second one-way clutches are axially fixed with respect to the housing.

17. A method of phasing a camshaft, comprising:
receiving, using a housing for a camshaft phaser, torque from an engine;
for an advance mode:
displacing, in a first axial direction and using a first resilient element, a first frusto-conical shaped surface for the camshaft phaser, the first frusto-conical shaped surface non-rotatably connected to the camshaft; and,
non-rotatably connecting the first frusto-conical shaped surface to a second frusto-conical shaped surface included in an inner race for a first one-way clutch included in the camshaft phaser and non-rotatably connected to a housing for the camshaft phaser; and,

for a retard mode:
displacing, in a second axial direction opposite the first axial direction and using a second resilient element, a third frusto-conical shaped surface for the camshaft phaser, the third frusto-conical shaped surface non-rotatably connected to the camshaft; and,
non-rotatably connecting the third frusto-conical shaped surface to a fourth frusto-conical shaped surface included in an inner race for a second one-way clutch included in the camshaft phaser and non-rotatably connected to the housing included in an inner race for the second one-way clutch.

18. The method of claim 17 , further comprising

Assignees

• Schaeffler Technologies Ag

Inventors

• Berndt Eric

Classifications

• F01L1/344

  changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear · CPC title

• F16D13/24

  with conical friction surfaces {cone clutches} · CPC title

• F16D41/08

  with provision for altering the freewheeling action · CPC title

• F01L1/46 Primary

  Component parts, details, or accessories, not provided for in preceding subgroups · CPC title

• F16D2125/64

  Levers · CPC title