Method for mounting a valve seat ring on a cylinder head of an internal combustion engine

Abstract

A method for mounting a valve seat ring on a cylinder head of an internal combustion engine includes providing a valve seat ring, which has a ring height, and which is measured along an axial direction. The valve seat ring includes a support portion made of a support material and a functional portion made of a functional material. The valve seat ring is arranged on the cylinder head and the support portion of the support material is at least partially removed, so that the ring height of the valve seat ring is reduced.

Claims

1. A method for mounting a valve seat ring on a cylinder head of an internal combustion engine, the method comprising: a) providing the valve seat ring having a ring height measured along an axial direction, the valve seat ring including a support portion made of a support material and a functional portion made of a functional material; b) arranging the valve seat ring on the cylinder head; and c) at least partially removing the support portion made of the support material, such that the ring height of the valve seat ring is reduced, and both the support portion and the functional portion at least partially abut a surface of the cylinder head.

2. The method according to claim 1, further comprising: after performing step b): at least partially forming a first axial end portion of the valve seat ring facing the cylinder head by the functional portion; and at least partially forming a second axial end portion of the valve seat ring facing away from the cylinder head by the support portion.

3. The method according to claim 1, wherein a separating surface between the functional portion and the support portion runs at least in portions along a radial direction of the valve seat ring.

4. The method according to one of claim 3, wherein the separating surface between the functional portion and the support portion runs at least in portions along the axial direction of the valve seat ring.

5. The method according to claim 1, wherein: after performing step b), the support portion and the functional portion are arranged next to one another along the axial direction.

6. The method according to claim 1, further comprising: after performing step b), abutting the functional portion at least partially against an inner jacket surface of the cylinder head.

7. The method according to claim 1, further comprising: performing the at least partially removing of the support portion in step c) in such a way that a boundary surface of the functional portion facing the support portion is at least partially exposed.

8. The method according to claim 1, further comprising: in step c), at least partially removing the functional portion made of the functional material in addition to the at least partially removing of the support portion made of the support material.

9. The method according to claim 1, wherein the ring height measured along the axial direction is the ring height formed at its maximum with respect to a radial direction of the valve seat ring.

10. A tribological system, comprising: the valve seat ring produced according to claim 1.

11. The internal combustion engine for a motor vehicle, comprising: at least one cylinder; and the valve seat ring being mounted according to claim 1.

12. The internal combustion engine for a motor vehicle, comprising: a tribological system according to claim 10.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure will now be described with reference to the drawings wherein:

(2) FIG. 1 shows a sectional view of a valve seat ring in a cross section along an axial direction of the valve seat ring according to a first exemplary embodiment of the disclosure, and

(3) FIG. 2 shows a sectional view of a valve seat ring in a cross section along an axial direction of the valve seat ring according to a second exemplary embodiment of the disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

(4) FIG. 1 shows a simplified valve seat arrangement 1 including a valve seat ring 2 mounted on a cylinder head 3 of an internal combustion engine according to a first exemplary embodiment of the disclosure. The valve seat ring 2 surrounds a valve opening 5, which can be closed by a valve body (not shown in FIG. 1) and which has a ring height H.sub.1 measured along an axial direction (A). In this first exemplary embodiment, the valve seat ring 2 includes a functional portion 2a made of functional material, which is arranged on a first axial end portion 6a of the valve seat 2 facing the cylinder head 3, and a support portion 2b made of support material, which is arranged on a second axial end portion 6b of the valve seat ring 2 facing away from the cylinder head 3. The functional portion 2a and the support portion 2b are separated by a separating surface T, which is arranged between the functional portion 2a and the support portion 2b. In the exemplary embodiment shown in FIG. 1, the separating surface T runs along a radial direction R of the valve seat ring 2. The functional portion 2a abuts against an inner jacket surface of the cylinder head 3.

(5) FIG. 2 illustrates a simplified valve seat arrangement 1 including a valve seat ring 2 mounted on a cylinder head 3 of an internal combustion engine according to a second exemplary embodiment of the disclosure. The valve seat ring 2 of the second example also includes a functional portion 2a made of functional material and a support portion 2b made of support material, which are separated by a separating surface T, which is arranged between the functional portion 2a and the support portion 2b. In this second exemplary embodiment, the functional portion 2a as well as the support portion 2b are arranged on both axial end portions 6a and 6b. In the exemplary embodiment shown in FIG. 2, the separating surface T runs along a radial axial direction A of the valve seat ring 2.

(6) The method according to the disclosure will be described below in an exemplary manner on the basis of FIGS. 1 and 2:

(7) After arranging the valve seat ring 2 on the cylinder head 3, the support portion 2b is at least partially removed in response to the finishing, so that the ring height H.sub.1 is reduced to the lower ring height H.sub.2. The functional portion 2a is also at least partially removed in response to the finishing. A dashed line shows the surface B, which limits the valve seat ring 2 after the removal of the functional and support portion 2a and 2b. A portion of the surface B, which is inclined to the axial direction A, forms the valve seat 4, against which a valve plate (not shown in FIGS. 1 and 2) of the valve body abuts in a closed position of the valve body.

(8) The valve seat ring 2 can be produced in a powder metallurgically manner, in particular monolithically. The functional portion 2a can be such that it is wear- and heat-resistant, and the support portion 2b can be such that it can be removed easily in response to the finishing, and, alternatively or additionally, is creep- and heat-resistant, and, alternatively or additionally, cost-efficient.

(9) It is understood that the foregoing description is that of the exemplary embodiments of the disclosure and that various changes and modifications may be made thereto without departing from the spirit and scope of the disclosure as defined in the appended claims.