Internal combustion engine having valve seat pockets

Patent metadata

Field	Value
Publication number	US-10975799-B2
Application number	US-201816153038-A
Country	US
Kind code	B2
Filing date	Oct 5, 2018
Priority date	Oct 5, 2017
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

An internal combustion engine for a vehicle is provided, having at least one cylinder with a first gas exchange inlet valve, a second gas exchange inlet valve, a first gas exchange outlet valve, a second gas exchange outlet valve, and a piston with a piston crown which has a plurality of valve seat pockets. In each case one valve seat pocket is provided for the first gas exchange inlet valve, the second gas exchange inlet valve, the first gas exchange outlet valve and the second gas exchange outlet valve, and the plurality of valve seat pockets have at least partially different depths. Alternatively, one valve seat pocket is provided for the first gas exchange inlet valve and the first gas exchange outlet valve, and no valve seat pocket is provided for the second gas exchange inlet valve and/or for the second gas exchange outlet valve.

First claim

The invention claimed is:

1. An internal combustion engine for a motor vehicle, having at least one cylinder comprising:
a first gas exchange inlet valve and a second gas exchange inlet valve;
a first gas exchange outlet valve and a second gas exchange outlet valve; and
a piston configured to be moved to and fro and including piston crown having a plurality of valve seat pockets:
wherein,
in each case at least one valve seat pocket being provided for the first gas exchange inlet valve, the second gas exchange inlet valve, the first gas exchange outlet valve and the second gas exchange outlet valve, and the plurality of valve seat pockets having at least partially different depths, wherein
the first gas exchange outlet valve is closing or configured to be closing later than the second gas exchange outlet valve and/or the first gas exchange inlet valve is opening or configured to be opening earlier than the second gas exchange inlet valve; and
a valve overlap between the first gas exchange outlet valve and the first gas exchange inlet valve is configured to be lying in a range between 30° CA and 50° CA; and
a valve overlap between the second gas exchange outlet valve and the second gas exchange inlet valve is configured to be lying in a range between 0° CA and 30° CA.

2. The internal combustion engine according to claim 1 ,
wherein the first gas exchange outlet valve and the first gas exchange inlet valve is actuated or configured to be actuated with a valve overlap.

3. The internal combustion engine according to claim 1 ,
wherein the first gas exchange outlet valve and the first gas exchange inlet valve is actuated or configured to be actuated with a valve overlap which is greater than a valve overlap between the second gas exchange outlet valve and the second gas exchange inlet valve; or
wherein the first gas exchange outlet valve and the first gas exchange inlet valve is actuated or configured to be actuated with a valve overlap, and the second gas exchange outlet valve and the second gas exchange inlet valve is actuated or configured to be actuated without a valve overlap.

4. The internal combustion engine according to claim 2 ,
wherein a flushing operation of the cylinder during the valve overlap occurs:
substantially between the first gas exchange inlet valve and the first gas exchange outlet valve which lie directly or obliquely opposite one another; or
substantially between the first gas exchange inlet valve, the second gas exchange inlet valve and the first gas exchange outlet valve.

5. The internal combustion engine according to claim 1 ,
wherein the first gas exchange outlet valve and the second gas exchange outlet valve is actuated or configured to be actuated independently of one another; and/or
wherein the first gas exchange inlet valve and the second gas exchange inlet valve is actuated or configured to be actuated independently of one another.

6. The internal combustion engine according to claim 1 ,
wherein a valve lift of the first gas exchange outlet valve at a top dead centre of a piston movement of the piston being greater than a valve lift of the second gas exchange outlet valve at the top dead centre; and/or
wherein a valve lift of the first gas exchange inlet valve at a top dead centre of a piston movement of the piston being greater than or equal to a valve lift of the second gas exchange inlet valve at the top dead centre.

7. The internal combustion engine according to claim 1 ,
wherein the piston crown comprises a piston crown recess.

8. The internal combustion engine according to claim 1 ,
wherein a maximum depth of a first outlet valve valve seat pocket of the plurality of valve seat pockets which is provided for the first gas exchange outlet valve being greater than a maximum depth of a second outlet valve valve seat pocket of the plurality of valve seat pockets which is provided for the second gas exchange outlet valve.

9. The internal combustion engine according to claim 8 ,
wherein the maximum depth of the first outlet valve valve seat pocket lying in a range of up to 4 mm, and the maximum depth of the second outlet valve valve seat pocket lying in a range of up to 2 mm.

10. The internal combustion engine according to claim 1 ,
wherein a maximum depth of a first inlet valve valve seat pocket of the plurality of valve seat pockets which is provided for the first gas exchange inlet valve being greater than or equal to a maximum depth of a second inlet valve valve seat pocket of the plurality of valve seat pockets which is provided for the second gas exchange inlet valve.

11. The internal combustion engine according to claim 10 ,
wherein the maximum depth of the first inlet valve valve seat pocket lying in a range between greater than O mm and 2 mm; and
wherein the maximum depth of the second inlet valve valve seat pocket lying in a range between greater than O mm and 2 mm.

12. The internal combustion engine according to claim 1 ,
wherein a depth of the plurality of valve seat pockets being adapted in each case to a valve lift of the respective gas exchange inlet valve and gas exchange outlet valve at a top dead centre of a piston movement of the piston.

13. A motor vehicle, having an internal combustion engine according to claim 1 .

14. The internal combustion engine according to claim 1 ,
wherein a valve overlap between the first gas exchange outlet valve and the first gas exchange inlet valve is configured to be lying at approximately 40° CA; and/or
wherein a valve overlap between the second gas exchange outlet valve and the second gas exchange inlet valve is configured to be lying at approximately 20° CA.

Assignees

• Man Truck & Bus Ag

Inventors

• Renner Dominik
• Malischewski Thomas

Classifications

• F02B23/06

  the combustion space being arranged in working piston (F02B23/04 takes precedence) · CPC title

• F02F3/28 Primary

  Other pistons with specially-shaped head · CPC title

• F02F1/4214

  specially adapted for four or more valves per cylinder · CPC title

• F02D13/0261

  Controlling the valve overlap · CPC title

• F02D13/0257

  Independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or is opened partially while the other is fully opened · CPC title