Gas exchange valve seat ring and gas exchange valve

Abstract

To provide a valve seat ring (10) for a gas exchange valve of a cylinder of an internal combustion engine.SOLUTION: The valve seat ring (10) includes: a multi-part main body (11) forming a through-flow opening (12); and a valve seat region (13) formed on a portion of the multi-part main body (11) in the region of the through-flow opening (12), where a surface of the valve seat region (13) forms a valve seat (14) for a valve body of the gas exchange valve. At least one recess (15) is disposed at least in the multi-part main body (11), and at least partly filled with a solder material (16).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seat ring for a gas exchange valve of an internal combustion engine.Furthermore, the present invention relates to a gas exchange valve for an internal combustion engine.

[0002] Prior art internal combustion engines are equipped with gas exchange valves, i.e. inlet gas exchange valves, through which the cylinders of the internal combustion engine can be supplied with charge air or charge air mixture and through which exhaust gases can be discharged from the cylinders of the internal combustion engine.

[0003] Each gas exchange valve of an internal combustion engine comprises a valve body which interacts with a valve seat ring, by closing the gas exchange valve the valve body abuts or rests on the seat of the valve seat ring, by opening the gas exchange valve the valve body is no longer resting on the seat of the valve seat ring but is separated or lifted away from the seat of the valve seat ring.

[0004] As is known from DE 10 200 03 133 A1, a seat ring of a gas exchange valve of an internal combustion engine is configured as a cooled seat ring. The seat ring disclosed in DE 10 200 03 133 A1 has a body configured from a number of parts, in particular from at least two ring parts which are connected to one another via a soldered joint. The two ring parts form a coolant passage for cooling the seat ring.

[0005] Patent document 2 discloses a further seat ring for a gas exchange valve of an internal combustion engine. The seat ring disclosed in Patent document 2 comprises an integrated body forming a through flow opening. A seat area forming a valve seat is connected to the body, and the seat ring is manufactured by hot isostatic pressing. Coolant passages for cooling the seat ring are arranged in the integrated body.

[0006] Patent document 3 discloses a further valve seat ring for a gas exchange valve of an internal combustion engine. Patent document 3 proposes that the valve seat ring is made of different materials. Thus, a three-dimensional structure is formed from a first material and a second material. The cavity of the three-dimensional structure is filled with a second material, the first material having a high strength compared to the second material and the second material having a high thermal conductivity compared to the first material. The valve seat area forming the actual valve seat is manufactured from a third material having a high ductility compared to the first and second materials. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] DE 102004027084 [Patent Document 2] DE 102011007140 [Patent Document 3] DE 102017102544 Summary of the Invention [Problem to be solved by the invention]

[0008] There is a need for further improvements in the valve seat ring, in particular with regard to improved heat dissipation with a view to reducing wear. Starting from this, the object of the present invention is to provide a new type of valve seat ring for a gas exchange valve, and a gas exchange valve equipped with said valve seat ring. [Means for solving the problem]

[0009] In a first embodiment of the invention, the object is solved by a seat ring according to claim 1, whereby at least one recess is arranged in the body and preferably in the seat area and is partially filled with brazing material. Since the at least one recess is filled with brazing material, heat is effectively dissipated from the seat ring, in particular from the seat area of ​​the seat ring.

[0010] At least one recess, preferably filled with brazing material, is arranged in the body and in the valve seat area, preferably Valve Up to the seat Through the valve seat area In this case, the brazing material is not only unavailable for heat dissipation, but also as lubricating material in the area of ​​the valve seat in order to reduce wear of the seat ring.

[0011] Preferably, an insert body is arranged in each recess and is secured thereto by a brazing material, the insert body serving as a heat transfer surface and / or a lubricating surface and / or a hard surface. By securing the insert body in each recess by the brazing material, wear of the seat ring can be further reduced.

[0012] In a second embodiment of the invention, the object is solved by a seat ring according to claim 10, whereby the seat area is made up of layers of different metallic materials, which layers form concentric rings on the seat, which allows for the dissipation of heat from the seat area and reduces wear on the seat ring.

[0013] The gas exchange valve according to the invention is defined in claim 12.

[0014] Preferred further developments of the invention emerge from the dependent claims and the detailed description of the invention.Exemplary embodiments of the invention will now be described in detail with reference to the accompanying non-limiting drawings, in which: FIG. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a partial view of a valve seat ring of the gas exchange valve of the present invention in the first embodiment of the present invention. [Figure 1a] 2A-2D show intermediate states in the manufacture of the seat ring shown in FIG. 1; [Figure 1b] 2A-2D show intermediate states in the manufacture of the seat ring shown in FIG. 1; [Diagram 2] FIG. 2 is a partial view of a second valve seat ring of the gas exchange valve of the present invention in the first embodiment of the present invention. [Figure 2a] 3A-3D represent intermediate states in the manufacture of the seat ring shown in FIG. 2; [Figure 2b] 3A-3D represent intermediate states in the manufacture of the seat ring shown in FIG. 2; [Diagram 3] FIG. 2 is a partial view of a third valve seat ring of the gas exchange valve of the present invention in the first embodiment of the present invention. [Figure 4] FIG. 2 is a partial view of a fourth valve seat ring of the gas exchange valve of the present invention in the first embodiment of the present invention. [Figure 4a] 5A-5D represent intermediate states in the manufacture of the seat ring shown in FIG. 4; [Figure 4b] 5A-5D represent intermediate states in the manufacture of the seat ring shown in FIG. 4; [Diagram 5] FIG. 2 is a partial view of a fifth valve seat ring of the gas exchange valve of the present invention in the first embodiment of the present invention. [Figure 6] FIG. 4 is a partial view of a seat ring of a gas exchange valve according to the present invention in a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Figures 1, 1a and 1b show detailed views of a first seat ring 10 of the present invention according to a first embodiment of the invention. The seat ring 10 comprises a body 11 defining a through flow opening 12, which in the exemplary embodiment shown in Figures 1, 1a and 1b is integrally formed.

[0017] The seat ring 10 comprises a seat area 13 formed in a portion of the body 11. The surface of the seat area 13 forms the seat area 13 and thus the valve seat 14 of the seat ring 10, which interacts with a valve body of a gas exchange valve (not shown).

[0018] In the exemplary embodiment shown in Figures 1, 1a and 1b, at least one recess 15 is arranged in the body 11, the recess 15 being at least partially filled with the brazing material 16, but may also be completely filled with the brazing material 16 as shown in the exemplary embodiment shown in Figures 1, 1a and 1b.

[0019] 1, 1a and 1b, the recess 15 is disposed only in the body 11. Specifically, the recess 15 extends axially from the body 11 towards the seat area 13 and terminates short of the seat area 13. A brazing material 16 is disposed in the recess 15, which is used for heat transfer to dissipate heat from the seat ring 11, specifically from the seat area 13 of the seat ring 11.

[0020] Figures 1a and 1b show intermediate stages for the production of the seat ring 10 shown in Figure 1. Figure 1a thus shows a recess 15 arranged in the body 11. In Figure 1b, a semi-finished product 17 of brazing material 16 is arranged in the region above the recess 15. By applying heat to the arrangement shown in Figure 1b, the semi-finished product 17 of brazing material 16 is liquefied and collected in the recess 15, for example by vacuum brazing. After cooling, the recess 15 is filled with the brazing material 16.

[0021] Fig. 2 illustrates a second exemplary embodiment of a seat ring 20 according to the present invention, similar to the first exemplary embodiment of the present invention. Fig. 2a and Fig. 2b illustrate intermediate states of the seat ring 20 during its manufacture.

[0022] The seat ring 20 shown in Fig. 2 also comprises a body 21 which defines a through flow opening 22. In the exemplary embodiment shown in Fig. 2, the body 21 is made in two parts 21a, 21b which are connected to one another along an abutting joint surface 28, in particular by soldering. The two parts 21a, 21b define a coolant space 29 through which, during operation, for example water flows.

[0023] The seat ring 20 has a seat area 23 in a portion of the body 21 , the surface of which forms a valve seat 24 .

[0024] Also, at least one recess 25 is arranged in the body 21, in particular in the portion 21b of the body 21, the recess 25 being at least partially filled, but also in the illustrated embodiment being completely filled, with a brazing material 26. In particular, in FIG.

[0025] 2, the recess 25 is arranged only in the body 21. Specifically, the recess 25 extends from the body 21 towards the valve seat region 23 when viewed in the axial direction of the through-flow opening 22 and terminates short of the valve seat region 23.

[0026] To manufacture the seat ring 20 shown in FIG. 2, the procedure shown in FIGS. 2a and 2b is followed, in which recesses 25 are arranged in the portion 21b of the body 21, after which a semi-finished product 27 consisting of brazing material 26 is placed in the region of the recesses 25 and, by applying heat to such an arrangement, the semi-finished product 27 is liquefied, so that the brazing material 26 flows into each of the recesses 25.

[0027] 3 shows a third exemplary embodiment of a seat ring 30 according to the invention, similar to the first embodiment of the invention. The body 31 of the seat ring 30 is formed in a multi-piece manner from parts 31a, 31b which are connected to each other along an abutment joint surface 38, similar to the exemplary embodiment shown in Figs. 2, 2a and 2b. The parts 31a, 31b form a coolant space 39.

[0028] The body 31 also defines a through flow opening 32 and a valve seat area 33 defining a valve seat 34 is formed in a portion of the body 31. Also, in the exemplary embodiment depicted in Fig. 3, at least one recess 35 is filled with brazing material 36, which in the exemplary embodiment depicted in Fig. 3 is disposed in the valve seat area 33 and in the body 31.

[0029] In the exemplary embodiment shown in FIG. 3, the recess 35 extends from the valve seat area 33 forming the valve seat 34 into the interior of the body 31 in the axial direction of the through-flow opening 32 . Penetrate 3, extending through the recesses 35 without interfering with the valve seat ring 30. A braze material 36 is disposed within each of the recesses 35. The braze material 36 is utilized to dissipate heat from the seat area 33 and also serves as a lubricant for the seat 34 to reduce wear on the seat ring 30 during operation.

[0030] Figures 4, 4a and 4b show a further exemplary embodiment of a seat ring 40 according to the invention, similar to the first embodiment of the invention, with intermediate states of the seat ring 40 during its production. The seat ring 40 shown in Figure 4 also has a multi-piece body 41 consisting of parts 41a, 41b connected in the region of the abutment joint surface 48, the parts 41a, 41b forming a through flow opening 42, and a seat area 43 forming a valve seat 44 is formed in one part of the body 41. In Figure 4, at least one recess 45 filled with brazing material 46 is arranged in the body 41 and in the seat area 43, the recess 45 extending from the body 41 towards the seat area 43, in particular into and through the seat area 43. In the case of FIG. 3, the brazing material 46 is used as a lubricant in the area of ​​the valve seat 44 and to dissipate heat towards the coolant passages 49, whereas in the case of FIG. 4, the brazing material 46 is allowed to come into contact with the cooling liquid flowing through the coolant passages 49.

[0031] The procedure for manufacturing the valve seat ring 40 shown in FIG. 4 includes preparing a body 41 having a valve seat area 43 and completely forming the valve seat area 43 from the beginning. penetration4b, recesses 45 are arranged in the body 41 and in the seat area 43 from the body 41, in particular from the part 41a of the body 41. After that, a semi-finished product 47 consisting of brazing material 46 is prepared and heat is applied to the semi-finished product 47. In this way according to FIG. 4b, the brazing material 46 flows into and fills each of the recesses 45. After this, the seat area 43 is machined by material cutting in order to form the seat ring 40. This makes the brazing material 46 in the area of ​​the seat 44 accessible, which is available for reducing wear.

[0032] 5 shows an exemplary embodiment of a seat ring 50 similar to the first embodiment of the invention. The seat ring 50 has a body 51 consisting of two parts 51a, 51b which are soldered together in the region of the abutment joint surface 58, the two parts 51a, 51b forming a coolant space 59. The body 51 of the seat ring 50 shown in FIG. 5 also forms a through-flow opening 52 and has a seat area 53 which forms the actual valve seat 54.

[0033] As in the exemplary embodiment shown in Fig. 4, at least one recess 55 is arranged in the body 51 and in the seat area 53, the recess 55 extending through the body 51, in particular through the portion 51b and through the seat area 53. However, in the exemplary embodiment shown in Fig. 5, in contrast to the exemplary embodiment shown in Fig. 4, the brazing material 56 and the insert body 57 are arranged in the recess 55, the insert body 57 being fixed or held in the respective recess 55 by the brazing material 56. Since the material of the insert body 57 is accessible in the area of ​​the valve seat 54, a certain lubricating surface and / or a surface with good heat transfer and / or a hard surface is provided in the area of ​​the valve seat 54, which can improve the wear resistance of the seat ring 50.

[0034] 6 shows an exemplary embodiment of a seat ring 60 as well as a second embodiment of the invention. The seat ring 60 comprises a body 61 consisting of parts 61a, 61b, which are connected along an abutment joint surface 68 and form a coolant space 69 for the coolant. The body 61 forms a through-flow opening 62 and comprises a seat area 63, the surface of which is formed as the actual valve seat 64.

[0035] In a second embodiment of the invention, the seat area 63 is made up of a number of layers 65, 66 of different metallic materials, which layers 65, 66 form concentric rings in the seat ring 64. Thus, layer 65 is preferably made of a metallic material having high ductility. Layer 66 is preferably made of a brazing material, which is beneficial for favorable heat transfer and lubrication properties. In the area of ​​the ring formed by layers 65, 66, each of these two metallic materials is accessible in the area of ​​the seat ring 64.

[0036] Furthermore, the invention relates to a gas exchange valve comprising such a seat ring, and to a valve body interacting with the respective seat of said seat ring. [Explanation of symbols]

[0037] 10 Valve seat ring 11 Main unit 12 Through flow opening 13 Valve seat area 14 Valve seat 15 Recess 16 Brazing materials 17 Semi-finished products 20 Valve seat ring 21 Main unit 21a part 21b part 22 Through flow opening 23 Valve seat area 24 Valve seat 25 Recess 26 Brazing materials 27 Semi-finished products 28 Abutting joint surface 29 Coolant space 30 Valve seat ring 31 Main unit 31a part 31b part 32 Through flow opening 33 Valve seat area 34 Valve seat 35 Recess 36 Brazing materials 37 Semi-finished products 38 Abutting joint surface 39 Coolant space 40 Valve seat ring 41 Main unit 41a part 41b part 42 Through flow opening 43 Valve seat area 44 Valve seat 45 Recess 46 Brazing materials 47 Semi-finished products 48 Butt joint surface 49 Coolant passage 50 Valve seat ring 51 Main unit 51a part 51b part 52 Through flow opening 53 Valve seat area 54 Valve seat 55 Recess 56 Brazing materials 57 Insert body 58 Abutting joint surface 59 Coolant space 60 Valve seat ring 61 Main unit 61a part 61b part 62 Through flow opening 63 Valve seat area 64 Valve seat 66 layers 68 Abutting joint surface 69 Coolant Space

Claims

1. A valve seat ring (30, 40, 50) for a gas exchange valve of a cylinder of an internal combustion engine, comprising a unitary or multi-piece body (31, 41, 51) defining a through-flow opening (32, 42, 52); a valve seat area (33, 43, 53) formed in a part of the body (11, 21, 31, 41, 51) in the region of the through-flow opening (32, 42, 52), the surface of which forms a valve seat (34, 44, 54) for a valve body of the gas exchange valve; In the valve seat ring (30, 40, 50), At least one recess (35, 45, 55) is disposed in at least said body (31, 41, 51) and is at least partially filled with a brazing material (36, 46, 56); at least one recess (35, 45, 55) filled with the brazing material (36, 46, 56) is arranged in the body (31, 41, 51) and in the valve seat area (33, 43, 53), 5. A valve seat ring comprising: a valve seat ring having a valve seat area and a valve body, the valve seat area being connected to a valve seat through which the valve seat is inserted; a valve seat region connected to a valve seat opening through which the valve seat is inserted;

2. 2. The seat ring according to claim 1, characterized in that the recess (35) extends in the axial direction of the through flow opening (32) from the seat area (33) towards the body (31) up to the inside of the body (31) but does not penetrate through the body (31).

3. 3. The seat ring of claim 1, wherein the brazing material (36, 46, 56) is utilized for heat transfer and lubrication.

4. An insert body (57) is disposed in each of the recesses (55) and is fixed in the recess (55) by the brazing material (56); 4. The seat ring according to any one of claims 1 to 3, characterized in that the insert body (57) serves as a heat transfer surface and / or a lubricating surface and / or a hard surface.

5. A valve seat ring (60) for a gas exchange valve of a cylinder of an internal combustion engine, comprising: a unitary or multi-piece body (61) defining a through flow opening (62); a valve seat area (63) formed in a part of the body (61) in the region of the through-flow opening (62), the surface of the valve seat area (63) forming a valve seat (64) for a valve body of the gas exchange valve; The seat ring (60) having the valve seat area (63) is made up of layers (65, 66) of different metallic materials, the layers (65, 66) forming concentric rings on the valve seat (64), the valve seat area (63) comprises a plurality of layers (65) of a highly ductile metallic material and a plurality of layers (66) of a brazing material; The brazing material is utilized for heat transfer and lubrication.

6. A gas exchange valve for an internal combustion engine, said gas exchange valve having a valve body and a valve seat ring (30, 40, 50, 60) for said valve body, A gas exchange valve, characterized in that the valve seat ring (30, 40, 50, 60) is a valve seat ring according to any one of claims 1 to 5.

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