Rotor for Camshaft Phaser and Camshaft Phaser

Patent metadata

Field	Value
Publication number	US-2022049633-A1
Application number	US-201817267087-A
Country	US
Kind code	A1
Filing date	Aug 22, 2018
Priority date	Aug 22, 2018
Publication date	Feb 17, 2022
Grant date	—

Abstract

The present disclosure relates to a rotor for a camshaft phaser. A balance groove is formed inside the end face of one axial side of the rotor and inside the end face of the other axial side of the rotor. A through-hole penetrating through the rotor in an axial direction is formed in the rotor, and the balance grooves at the two sides of the rotor are in communication with each other by the through-hole. The rotor can balance gaps between the rotor and two end covers, so that the amount of engine oil leaking from the gaps of an oil chamber can be maintained at a low level, and the probability of hard contact between the rotor and the end covers is reduced, thus also reducing the wear between the rotor and the end covers.

First claim

1 . A rotor for a camshaft phaser, comprising:
a first balance groove formed on a first end face of a first axial side of the rotor; a second balance groove formed on a second end face of a second axial side of the rotor; at least one through-hole penetrating through the rotor in an axial direction; and, the first balance groove and the second balance groove are in fluid communication with each other via the at least one through-hole; and, each of the first and second balance grooves are arranged with spacing relative to a periphery of the rotor.

2 . The rotor of claim 1 , wherein a first total volume of the first balance groove is equal to a second total volume of the second balance groove.

3 . The rotor of claim 1 , wherein a minimum spacing between the first balance groove and a periphery of the rotor is greater than or equal to 3 mm.

4 . The rotor of claim 1 , wherein the rotor further comprises a cylindrical main body and a plurality of rotor blades protruding from the main body, and
the first balancing groove includes a circumferential groove formed in the main body.

5 . The rotor of claim 4 , wherein the circumferential groove extends continuously for 360 degrees.

6 . The rotor of claim 4 , wherein the first balance groove further comprises a radial groove extending outwards one of the plurality of rotor blades in a radial direction from the circumferential groove, and the radial groove is in fluid communication with the circumferential groove.

7 . The rotor of claim 4 , wherein the at least one through-hole includes a plurality of through-holes evenly distributed in a circumferential direction within the circumferential groove.

8 . The rotor claim 6 , wherein the at least one through-hole includes a through-hole formed in the radial groove.

9 . The rotor of claim 1 , wherein the rotor is formed by powder metallurgy.

10 . The rotor of claim 1 , wherein the rotor is a component of a camshaft phaser.

11 . A camshaft phaser, comprising:
a stator configured with radially inwardly extending protrusions; a rotor having:
a first balance groove formed on a first end face of a first axial side of the rotor, the first balance groove; and,
a second balance groove formed on a second end face of a second axial side of the rotor;
at least one through-hole penetrating through the rotor in an axial direction, the first balance groove and the second balance groove in fluid communication with each other via the at least one through-hole; and,
radially outwardly extending blades; and,
a first end cover; and, a second end cover; and, the first and second end covers, the blades, and the protrusions configured to form a first oil chamber and a second oil chamber; and, the first oil chamber configured receive engine oil to rotate the rotor in a first rotational direction relative to the stator, defining a first working state; and, the second oil chamber configured to receive engine oil to rotate the rotor in a second rotational direction relative to the stator, defining a second working state; and, in the first working state:
the first balance groove is configured to receive engine oil from the second balance groove via the at least one through-hole to move the rotor in a first axial direction; and,
the second balance groove is configured to receive engine oil from the second balance groove via the at least one through-hole to move the rotor in a second axial direction.

12 . The camshaft phaser of claim 11 , wherein:
the first end cover forms a first gap with the first end face; the second end cover forms a second gap with the second end face; and, in the first working state:
the first balance groove is configured to receive engine oil from the second gap via the second balance groove and the at least one through-hole; and,
the second balance groove is configured to receive engine oil from the first gap via the second balance groove and the at least one through-hole.

13 . The camshaft phaser of claim 11 , wherein in the second working state:
the first balance groove is configured to receive engine oil from the second balance groove via the at least one through-hole; and, the second balance groove is configured to receive engine oil from the second balance groove via the at least one through-hole.

14 . The camshaft phaser of claim 13 , wherein:
the first end cover forms a first gap with the first end face; the second end cover forms a second gap with the second end face; and, in the second working state:
the first balance groove is configured to receive engine oil from the second gap via the second balance groove and the at least one through-hole; and,
the second balance groove is configured to receive engine oil from the first gap via the second balance groove and the at least one through-hole.

15 . The camshaft phaser of claim 11 , wherein a first total volume of the first balance groove is equal to a second total volume of the second balance groove.

16 . The camshaft phaser of claim 11 , wherein the first and second balance grooves are arranged on a cylindrical main body of the rotor.

17 . The camshaft phaser of claim 16 , wherein the first and second balance grooves each include a circumferential groove.

18 . The camshaft phaser of claim 17 , wherein the circumferential groove extends continuously for 360 degrees.

19 . A rotor for a camshaft phaser, comprising:
a first balance groove formed on a first end face of a first axial side of the rotor; a second balance groove formed on a second end face of a second axial side of the rotor; at least one through-hole penetrating through the rotor in an axial direction; and, the first balance groove and the second balance groove are in fluid communication with each other via the at least one through-hole; and, a plurality of blades having:
a first side configured to receive engine oil to move the rotor in a first rotational direction, defining a first working state; and,
a second side configured to receive engine oil to move the rotor in a second rotational direction, defining a second working state; and,
in the first working state:
the first balance groove is configured to receive engine oil from the second balance groove via the at least one through-hole to move the rotor in a first axial direction; and,
the second balance groove is configured to receive engine oil from the first balance groove via the at least one through-hole to move the rotor in a second axial direction.

20 . The rotor of claim 19 , wherein each of the first and second balance grooves include a circumferential groove and a radial groove, the radial groove extending within one of the plurality of blades from the circumferential groove.

Assignees

• Wang Peng
• Schaeffler Technologies Ag

Inventors

• Wang Peng

Classifications

• F01L2001/34479

  Sealing of phaser devices · CPC title

• F01L1/047

  Camshafts · CPC title

• F01L1/3442 Primary

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

• F01L2250/02

  the camshaft being driven by chains · CPC title

• F01L2001/3445

  Details relating to the hydraulic means for changing the angular relationship · CPC title