Rotor for cam phaser with improved geometry

Abstract

A rotor for a cam phaser, the rotor rotating about a rotation axis and the rotor including a first face; a receiving face arranged opposite to the first face; a central portion; at least one lobe that is arranged at the central portion and which extends away from the central portion in a radial direction; and a cam shaft receiving recess provided at the receiving face and configured to receive a cam shaft, wherein the cam shaft receiving recess includes an inside surface, wherein at least two cam shaft centering elements are arranged at the inside surface for centering the cam shaft, and wherein the cam shaft centering elements are configured as protrusions. The invention also relates to a joining kit.

Claims

1. A rotor for a cam phaser, the rotor rotating about a rotation axis and the rotor comprising: a first face; a receiving face arranged opposite to the first face; a central portion; at least two lobes that are arranged at the central portion and which extend away from the central portion in a radial direction; and a cam shaft receiving recess provided at the receiving face and configured to receive a cam shaft, wherein the cam shaft receiving recess includes an inside surface, wherein each of the at least two lobes has an associated cam shaft centering element arranged at the inside surface for centering the cam shaft, wherein each of the associated cam shaft centering elements is configured as a protrusion, wherein each lobe of the at least two lobes has an angular orientation that corresponds to an angular orientation of its associated cam shaft centering element, and wherein each of the at least two lobes shares a plane of symmetry that includes the rotation axis with the associated cam shaft centering element.

2. The rotor according to claim 1, wherein a number of the associated cam shaft centering elements corresponds to a number of the at least two lobes.

3. The rotor according to claim 1, wherein the cam shaft receiving recess has a circular opening surface.

4. The rotor according to claim 3, wherein each of the associated cam shaft centering elements protrude along a circular circumferential cut out of the inside surface radially in a direction towards the rotation axis.

5. The rotor according to claim 3, wherein an angular extension of at least two associated cam shaft centering elements is identical or an angular offset between two respective adjacent associated cam shaft centering elements is identical.

6. The rotor according to claim 1, wherein the rotor is joined from two separately produced rotor elements.

7. The rotor according to claim 1, wherein the rotor is produced partially or completely by a metal powder method.

8. The rotor according to claim 7, wherein the rotor is partially or completely made from a sinter metal, a sinter steel or a sinter ceramic material.

9. The rotor according to claim 1, wherein the associated cam shaft centering elements are produced by a master forming method and adjusting a radial dimension of the associated cam shaft centering elements includes calibrating.

10. The rotor according to claim 1, wherein a surface of the associated cam shaft centering elements is open porous or free from traces of mechanical surface finishing.

11. A joining kit, comprising: at least one rotor according to claim 1; and at least one cam shaft provided for insertion into the cam shaft receiving recess, the at least one cam shaft provided with a cross sectional dimension predetermined for this purpose in an insertion portion of the cam shaft, wherein a radial extension of the protrusions has a tolerance range of less than 30 m and more than 10 m with the cam shaft of the joining kit.

12. The rotor according to claim 1, wherein an angular extension of at least two associated cam shaft centering elements is identical and an angular offset between two respective adjacent associated cam shaft centering elements is identical.

13. The rotor according to claim 1, wherein a surface of the associated cam shaft centering elements is open porous and free from traces of mechanical surface finishing.

14. The rotor according to claim 1, wherein each of the at least two lobes and the associated cam shaft centering element of each of the at least two lobes have a geometric center of gravity located in the plane of symmetry.

15. A rotor for a cam phaser, the rotor rotating about a rotation axis and the rotor comprising: a first face; a receiving face arranged opposite to the first face; a central portion; at least two lobes that are arranged at the central portion and which extend away from the central portion in a radial direction; and a cam shaft receiving recess provided at the receiving face and configured to receive a cam shaft, wherein the cam shaft receiving recess includes an inside surface, wherein each of the at least two lobes has an associated cam shaft centering element arranged at the inside surface for centering the cam shaft, wherein each of the associated cam shaft centering elements is configured as a protrusion, wherein each lobe of the at least two lobes has an angular orientation that corresponds to an angular orientation of its associated cam shaft centering element, and wherein each of the at least two lobes in combination with the associated cam shaft centering element have a plane of symmetry which includes the rotation axis.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further advantageous embodiments and improvements can derived from the subsequent figures. The details and features that can be derived from the figures are not limited to the embodiments illustrated in the figures. Rather one or plural features can be combined with one or plural features from the description provided supra to form new embodiments. In particular the subsequent descriptions do not define limitations of the scope of the invention but they describe individual features and their possible cooperation. In the drawings:

(2) FIG. 1 illustrates a rotor for a cam phaser in a top view of a receiving face; and

(3) FIG. 2 illustrates a rotor for a cam phaser in a slanted view, wherein the slanted view shows the receiving face.

(4) FIG. 3 illustrates a cam shaft 1 configured for insertion into the cam shaft receiving recess 106.

DETAILED DESCRIPTION OF THE INVENTION

(5) In the figures identical or equivalent components are designated with identical reference numerals. The figures only illustrate exemplary embodiments and do not limit the scope of the invention.

(6) FIG. 1 shows a rotor 101 for a cam phaser. The rotor 101 is thus illustrated in a top view of a receiving face 104. A first face which is arranged opposite to the receiving face and is thus provided on the other side of the rotor 101 is thus not illustrated in FIG. 1. The rotor furthermore includes a central portion which is provided as a hollow element with an approximately circular cross section in the present embodiment of the rotor 101. Thus, the rotor 101 is a rotor with a circular cylindrical enveloping surface and a rotation axis 102 which is identical with the center point of the circular cross section in the illustrated embodiment of the rotor 101.

(7) A first lobe 105 is arranged at the central portion and four additional lobes, wherein four of the five lobes in the illustrated embodiment of the rotor 101 are identically shaped lobes and the fifth lobe differs from the other lobes with respect to its configuration since the lobe has to perform another function. The central portion includes a cam shaft receiving recess 106 which is provided in the central portion. Since the cam shaft receiving recess 106 is provided an inside surface 107 is formed at the essentially circular central portion. The inside surface 107 includes at least two cam shaft centering elements 108.1 and 108.2. Additionally the rotor 101 includes additional cam shaft centering elements 108.3, 108.4 and 108.5. In the illustrated embodiment of the rotor 101 the cam shaft centering elements are protrusions which extend in a radial direction from the inside surface 107. In the illustrated embodiment of the rotor 101 the cam shaft centering elements 108.1, 108.2, 108.3, 108.4 and 108.5 are protrusions which are configured as partial bars as cut outs from an enveloping surface of a circular cylinder. Furthermore an angular extension of all cam shaft centering elements, thus of each of the cam shaft centering elements 108.1, 108.2, 108.3, 108.4 and 108.5 is identical. This means for example for the embodiment of the cam shaft centering elements 108.2 and 108.3 that an angle between the dashed path 109 and the dashed path 110 is identical with an angle between the dashed path 111 and the dashed path 112. This can be continued for the remaining cam shaft centering elements. Furthermore a rotor 101 is configured so that a distribution of the cam shaft centering elements is provided evenly so that an angular offset of two adjacent cam shaft centering elements is identical for each pair of two adjacent cam shaft centering elements. For the embodiment of the rotor 101 this means that for example the angle between the dashed path 110 and the dashed path 111 is identical with an angle between the dashed path 112 and the dashed path 113.

(8) FIG. 2 includes another embodiment of a rotor for a cam phaser. The rotor 201 of FIG. 2 is thus illustrated in a slanted perspective view.

(9) The slanted perspective view in this case is also illustrated comparable with the illustration of FIG. 1 looking at the receiving face 204. The first face that is arranged opposite to the receiving face is therefore not visible in FIG. 2 either. Furthermore a rotation axis 202 is drawn and the rotor 201 rotates about the rotation axis. The rotor 201 includes a central portion which is enveloped by an approximately circular cylindrical enveloping surface. A first lobe 205 is arranged at the central portion and four additional lobes in addition to the first lobe 205 wherein three of the lobes are visible in FIG. 2 and a fourth lobe is indicated in a lower portion of FIG. 2. A cam shaft receiving recess 206 is furthermore visible at the receiving face, wherein the cam shaft receiving recess essentially fills a circular cylindrical volume in the central portion of the rotor. This forms an inside surface 207 approximately corresponding to an enveloping surface of a circular cylinder.

(10) A total of five cam shaft centering elements are configured at the inside surface 207. A first cam shaft centering element 208.1 is indicated, a second cam shaft centering element 208.2 and a third cam shaft centering element 208.3 are visible and two additional cam shaft centering elements are covered in the perspective view. In the illustrated embodiment of the rotor 201 the distribution of the cam shaft centering elements is characterized by an even angle distribution at a circumference of the inside surface. Thus, the angle between the dashed path 209 and the dashed path 210 is identical to the angle between the dashed path 211 and the dashed path 212. The angular extension of each individual cam shaft centering element in the illustrated embodiment is also identical. The angular extension, thus the angle between the dashed path 210 and the dashed path 211 is identical to the angle between the dashed path 212 and the dashed path 213.