Rotor part of a rotor for a camshaft adjuster and pressing tool for the production thereof

Patent metadata

Field	Value
Publication number	US-10753238-B2
Application number	US-201716466952-A
Country	US
Kind code	B2
Filing date	Dec 1, 2017
Priority date	Dec 6, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

The invention relates to a first rotor part for a camshaft adjuster, wherein the first rotor part is configured in the form of a disc, and wherein the first rotor part has an encircling shoulder in a circumferential direction, said shoulder extending in a first axial direction beyond the first end side, wherein the first rotor part has at least one inner first opening which is arranged on the first inner casing on that side of the shoulder that is remote from the first end side and which is connected to the first end side via a first fluid duct which extends outwards in the radial direction from the shoulder through the first rotor part; wherein the first rotor part is produced in one part by powder metallurgy with all the inner first openings and first fluid ducts and the shoulder. The invention also relates to a pressing tool for producing a first rotor part.

First claim

The invention claimed is:

1. A first rotor part of a rotor for a camshaft adjuster, wherein the first rotor part is configured in a form of a disc extending between a first end face and a second end face in an axial direction and extending between a first inner casing and a first outer casing in a radial direction, the first rotor part comprising:
an annular shoulder on the first inner casing, the shoulder extending inward from the first inner casing in the radial direction and extending beyond the first end face in the axial direction so as to form an outer circumferential surface; and
a first fluid duct extending outwardly from the shoulder through the first rotor part in the radial direction,
wherein the first inner casing further includes at least one first inner opening at a side of the shoulder facing away from the first end face, the at least one first inner opening fluidly connected to the first end face via the first fluid duct,
wherein the first rotor part is produced as a single piece by powder metallurgy.

2. The first rotor part according to claim 1 , wherein the at least one first inner opening and the first fluid duct are produced without cutting.

3. A rotor for rotatable arrangement in a stator of a camshaft adjuster, the rotor comprising:
the first rotor part according to claim 1 ,
wherein the shoulder of the first rotor part extends axially into a second rotor part such that the second rotor part is arranged on the outer circumferential surface of the shoulder.

4. The rotor according to claim 3 , wherein the shoulder defines a smallest internal diameter of the first rotor part,
wherein the shoulder includes an annular first end surface on the side of the shoulder facing away from the first end face extending between the first inner casing and the smallest internal diameter, the first end surface bounding the first fluid duct in the axial direction,
wherein the shoulder further includes an annular second end surface on a side facing toward the second rotor part extending between the outer circumferential surface and the smallest internal diameter, and
wherein the second rotor part includes:
a second inner casing including a second inner opening; and
a second fluid duct extending radially outwardly from the second inner opening through the second rotor part,

wherein the second end surface bounds the second fluid duct in the axial direction.

5. The rotor according to claim 3 , wherein the second rotor part is made as a single piece by powder metallurgy.

6. The rotor according to claim 4 , wherein the second inner opening and the second fluid duct, are produced without cutting.

7. The rotor according to claim 3 , wherein the first rotor part and the second rotor part are joined in force closure by a press fit between the outer circumferential surface of the shoulder and the second rotor part along the axial direction.

8. The rotor according to claim 7 , wherein the first rotor part and the second rotor part are joined at a further press fit in a location radially outward from the shoulder.

9. The rotor according to claim 8 , wherein the rotor further comprises at least one control vane extending radially outward from an outer casing of the rotor
wherein the further press fit is formed at the at least one control vane.

10. The rotor according to claim 3 , wherein the outer circumferential surface includes at least one profiling configured to join the first rotor part and the second rotor part by form fit in a circumferential direction.

11. A camshaft adjuster comprising:
a stator; and
the rotor according to claim 3 , the rotor rotatably arranged in the stator,
wherein the second rotor part includes:
a second inner casing including a second inner opening; and
a second fluid duct extending radially outwardly from the second inner opening through the second rotor part,

wherein the rotor further comprises at least one control vane, extending radially outward from at least one of the first outer casing and a second outer casing of the second rotor part toward the stator, wherein the at least one control vane divides a space within the stator into a first chamber and a second chamber,
wherein the first chamber is connected to the first fluid duct and the second chamber is connected to the second fluid duct.

12. A method for producing the rotor according to claim 3 , the method comprising:
sintering the first rotor part;
sintering the second rotor part; and
connecting of the first rotor part and the second rotor part by at least one press fit between the outer circumferential surface and the second rotor part so as to form the rotor.

13. A pressing tool for producing a first rotor part, configured in a form of a disc extending between a first end face and a second end face in an axial direction and extending between a first inner casing and a first outer casing in a radial direction the first rotor part including an annular shoulder on the first inner casing, the shoulder extending inward from the first inner casing in the radial direction so as to define a smallest internal diameter of the first rotor part, the shoulder further extending beyond the first end face in the axial direction so as to form an outer circumferential surface and an annular second end surface extending between the outer circumferential surface and the smallest internal diameter, the first rotor part further including a first fluid duct extending outwardly from the shoulder through the first rotor part in the radial direction and at least one first inner opening arranged on the first inner casing at a side of the shoulder facing away from the first end face, the at least one first inner opening fluidly connected to the first end face via the first fluid duct, the pressing tool comprising:
a plurality of rams, each ram configured to move along the axial direction, the plurality of rams including:
at least one upper ram, configured to contact the second end face,
at least one first lower ram, configured to contact the first end face and
at least one second lower ram, configured to travel along the at least one first lower ram,

wherein an inwardly-facing ram surface of the at least one second lower ram is configured to contact an outwardly-facing ram circumferential surface of the at least one upper ram.

14. A method for producing a first rotor part with the pressing tool according to claim 13 , the method comprising:
moving the at least one upper ram and the at least one first lower ram towards one another;
moving the at least one second lower ram along the at least one first lower ram such that the inwardly-facing ram surface of the at least one second lower ram travels along and contacts the outwardly-facing ram circumferential surface of the at least one upper ram; and
pressing a powder between the at least one upper ram, the at least one first lower ram, and the at least one second lower ram so as to compact the powder and form the first rotor part;
wherein, during the pressing:
forming a second end face of the first rotor part with the at least one upper ram,
forming a first end face of the first rotor part with the at least one first lower ram,
forming an annular shoulder of the first rotor part with the at least one upper ram and the at least one first lower ram,
forming a first fluid duct and at least one first inner opening of the first rotor part with the at least one upper ram, the at least one first lower ram, and the at least one second lower ram.

Assignees

• Gkn Sinter Metals Engineering Gmbh

Inventors

• Schmitt Rainer
• Tekines Hasim
• Frey Sascha
• Aydin Ümit

Classifications

• F01L2303/01

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• B22F3/03

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• F01L1/3442 Primary

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• F01L2303/00

  Manufacturing of components used in valve arrangements · CPC title

• F01L2001/34479

  Sealing of phaser devices · CPC title