Reciprocating-piston internal combustion engine

Patent metadata

Field	Value
Publication number	US-11873779-B2
Application number	US-202117911062-A
Country	US
Kind code	B2
Filing date	Feb 22, 2021
Priority date	Mar 12, 2020
Publication date	Jan 16, 2024
Grant date	Jan 16, 2024

Abstract

A reciprocating combustion engine includes at least one cylinder, in which a reciprocating piston is arranged back and forth movable. The reciprocating combustion engine includes a pin structure arranged on the combustion chamber side in the area of the cylinder head or the piston bottom. Due to the pin structure, local peak temperatures can be avoided during the combustion process, so that NOx emissions can be avoided or at least greatly reduced. A motor vehicle, for example a commercial vehicle, includes a reciprocating combustion engine.

First claim

What is claimed is:

1. A reciprocating-piston internal combustion engine, comprising at least one cylinder in which a reciprocating piston is disposed so as to be movable in a reciprocating manner, a cylinder head, the reciprocating piston having a piston crown, a combustion chamber formed between the cylinder head and the piston crown, wherein a pin structure comprising a plurality of pins is disposed in the combustion chamber in the region of the cylinder head or of the piston crown, and further comprising a baffle pin being disposed in the region of the pin structure for deflecting or distributing introduced fuel toward the pin structure, wherein the baffle pin comprises at least one of the following attributes:
a) a diameter of the baffle pin is larger than a diameter of the pins,
b) the baffle pin is shorter than the pins.

2. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure, by way of the surface thereof is configured to develop a heat-storing or temperature-equalizing effect during combustion in the combustion chamber; or
is a pin structure for homogenizing a mixture generation or a combustion in the combustion chamber, or is a pin structure for promoting a more homogeneous mixture generation or combustion in the combustion chamber.

3. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure occupies a volumetric proportion in the range from 5% to 40% of the combustion chamber when the reciprocating piston is at the top dead center, TDC.

4. The reciprocating-piston internal combustion engine as claimed in claim 3 , wherein the pin structure occupies a volumetric proportion int eh range from 10% to 20% of the combustion chamber when the reciprocating piston is at the top dead center, TDC.

5. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure, disposed in the combustion chamber in the region of the piston crown, is disposed in a bowl of the piston crown or extends in the manner of stalagmites in the direction of the combustion chamber.

6. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure, disposed in the combustion chamber in the region of the cylinder head is dispose din the cylinder head; or
is disposed in a recess of the cylinder head; or
is disposed below the cylinder head; or
from the cylinder head extends in the manner of stalagtites in the direction of the combustion chamber.

7. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure includes a plurality of pins, or is configured by a plurality of pins.

8. The reciprocating-piston internal combustion engine as claims in claim 7 , wherein,
the pin structure includes at least 10 pins; or
the pin structure includes at least 20 pins; or
the pin structure includes at least 30 pins; or
the plurality of pins is disposed so as to be mutually spaced apart or so as not to be interconnected in the combustion chamber.

9. The reciprocating-piston internal combustion chamber as claimed in claim 7 , wherein,
a length of the plurality of pins is greater than the diameter of the pins; or
the plurality of pins is embodied so as to be cylindrical or in the shape of studs; or
the plurality of pins extend so as to be parallel or substantially parallel to the direction of movement of the piston.

10. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the baffle pin is disposed in a central region of the pin structure; or
in terms of an introduction direction of the fuel into the combustion chamber and the pin structure is disposed and configured such that introduced fuel at least largely impacts the baffle pin and by the latter is deflected or distributed in the radial direction toward the pin structure.

11. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure is formed from a metallic material or a ceramic material.

12. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the pin structure, when the piston is at the TDC position, is disposed in the compression chamber of the combustion chamber or in a region of the combustion chamber in which combustion of the compressed air/fuel mixture takes place.

13. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the reciprocating-piston internal combustion engine is a reciprocating-piston internal combustion engine which is operated using gaseous of liquid fuel.

14. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the reciprocating-piston internal combustion engine is configured to supply to the combustion chamber a pressurized fuel required for a combustion procedure in only one injection procedure before or when the top dead center is reached.

15. The reciprocating-piston internal combustion engine as claimed in claim 1 , wherein the reciprocating-piston internal combustion engine is configured to supply to the combustion chamber a sub-quantity of a fuel required for a combustion procedure, for generating a lean, non-ignitable mixture by a movement of the piston toward the top dead center; and
to subsequently supply a residual quantity of the fuel required for a combustion procedure in the region of the top dead center, TDC, for initiating the compressed ignition or the induced ignition.

16. A motor vehicle, comprising:
a reciprocating-piston internal combustion engine, the reciprocating-piston internal combustion engine including at least one cylinder in which a reciprocating piston disposed so as to be movable in a reciprocating manner, a cylinder head, the reciprocating piston having a piston crown, a combustion chamber formed between the cylinder head and the piston crown, wherein a pin structure comprising a plurality of pins is disposed in the combustion chamber in the region of the cylinder head or of the piston crown; and further comprising a baffle pin being disposed in the region of the pin structure for deflecting or distributing introduced fuel toward the pin structure, wherein the baffle pin comprises at least one of the following attributes:
a) a diameter of the baffle pin is larger than a diameter of the pins,
b) the baffle pin is shorter than the pins.

Assignees

• Man Truck & Bus Se

Inventors

• Cypris Jochen

Classifications

• F02F3/285 Primary

  the head being provided with an insert located in or on the combustion-gas-swept surface · CPC title

• F02B1/12

  with compression ignition (with fuel-air charge ignited by compression ignition of an additional fuel F02B7/00) · CPC title

• F02F3/26

  having combustion chamber in piston head (the surface thereof being covered F02F3/14) · CPC title

• F02B9/06 Primary

  with non-timed positive ignition, e.g. with hot-spots · CPC title

• F02B23/0678

  Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets · CPC title