Sub-assembly consisting of a piston and an injection nozzle for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-9951715-B2
Application number	US-201414913660-A
Country	US
Kind code	B2
Filing date	Aug 22, 2014
Priority date	Aug 23, 2013
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A sub-assembly may include a piston and an injection nozzle for cooling oil for an internal combustion engine. The piston may have a piston skirt and a piston head, where the piston may have a piston crown with an underside, a circumferential ring part, and in the region of the ring part, a circumferential cooling channel with at least one feed opening for the cooling oil. The piston may also have a jet divider for the cooling oil on the underside of the piston crown adjacent to the at least one feed opening. The injection nozzle may be arranged below the jet divider and may be oriented toward the jet divider.

First claim

The invention claimed is:

1. A sub-assembly comprising a piston and an injection nozzle for cooling oil for an internal combustion engine, the piston having:
a piston skirt,
a piston head having a piston crown with an underside, a circumferential ring part and, in the region of the ring part, a circumferential cooling channel with at least one feed opening for the cooling oil, and
a jet divider for the cooling oil on the underside of the piston crown adjacent to the at least one feed opening,
wherein the injection nozzle is arranged below the jet divider and is oriented toward the jet divider and with respect to the piston such that at top and bottom dead center positions, the oil jet enters directly into the cooling channel and past the jet divider, and in a middle stroke position, the oil jet strikes the jet divider such that a portion of the oil jet enters the cooling channel and another portion of the oil jet is steered in a direction of an underside of the piston crown.

2. The sub-assembly as claimed in claim 1 , wherein a center axis of the injection nozzle is oriented parallel to a center axis of the piston.

3. The sub-assembly as claimed in claim 1 , wherein a center axis of the injection nozzle encloses an acute angle with a center axis of the piston.

4. The sub-assembly as claimed in claim 1 , wherein the jet divider has a substantially V-shaped cross section with an edge oriented in a direction from a center axis of the piston toward the cooling channel.

5. The sub-assembly as claimed in claim 1 , wherein the jet divider is configured in one piece with the piston head.

6. The sub-assembly as claimed in claim 1 , wherein the jet divider is configured as a separate component connected fixedly to the piston head.

7. The sub-assembly as claimed in claim 1 , wherein the jet divider has a first guiding face and a second guiding face, the first guiding face being assigned to the cooling channel and the second guiding face being assigned to the underside of the piston crown.

8. The sub-assembly as claimed in claim 7 , wherein the first guiding face merges continuously into an inner wall of the cooling channel.

9. The sub-assembly as claimed in claim 7 , wherein the second guiding face merges continuously into the underside of the piston crown.

10. The sub-assembly as claimed in claim 1 , wherein the piston is configured as a single-piece piston.

11. The sub-assembly as claimed in claim 1 , wherein the piston consists of at least two components connected to one another.

12. The sub-assembly as claimed in claim 1 , wherein the piston is configured as a box-type piston.

13. The sub-assembly as claimed in claim 1 , wherein the cooling channel of the piston is configured as a closed cooling channel.

14. The sub-assembly as claimed in claim 1 , wherein the cooling channel of the piston is configured as a cooling channel which is open toward the bottom and is closed by way of a closure element.

15. The sub-assembly as claimed in claim 14 , wherein the piston has a thermally decoupled piston skirt.

16. A sub-assembly comprising a piston and an injection nozzle for cooling oil for an internal combustion engine, the piston having:
a piston skirt,
a piston head having a piston crown with an underside, a circumferential ring part and, in the region of the ring part, a circumferential cooling channel with at least one feed opening for the cooling oil, and
a jet divider for the cooling oil on the underside of the piston crown adjacent to the at least one feed opening, the jet divider having a first guiding face and a second guiding face, the first guiding face merging continuously into an inner wall of the cooling channel, and the second guiding face merging continuously into the underside of the piston crown,
wherein the jet divider has a substantially V-shaped cross section with an edge oriented in a direction from a center axis of the piston toward the cooling channel, and
wherein the injection nozzle is arranged below the jet divider and is oriented toward the jet divider and with respect to the piston such that at top and bottom dead center positions, the oil jet enters directly into the cooling channel and past the jet divider, and in a middle stroke position, the oil jet strikes the jet divider such that a portion of the oil jet enters the cooling channel and another portion of the oil jet is steered in a direction of an underside of the piston crown.

17. The sub-assembly as claimed in claim 16 , wherein a center axis of the injection nozzle is oriented parallel to the center axis of the piston.

18. The sub-assembly as claimed in claim 16 , wherein the piston is configured as a single-piece piston.

19. The sub-assembly as claimed in claim 16 , wherein the jet divider is configured in one piece with the piston head.

20. The sub-assembly as claimed in claim 16 , wherein the cooling channel of the piston is configured as a closed cooling channel.

Assignees

• Mahle Int Gmbh

Inventors

• Scharp Rainer

Classifications

• F02F3/22 Primary

  the fluid being liquid · CPC title

• F01P3/08

  Cooling of piston exterior only, e.g. by jets · CPC title

• F01P3/10

  Cooling by flow of coolant through pistons · CPC title