Split piston ring unit

Patent metadata

Field	Value
Publication number	US-12247667-B2
Application number	US-202318196423-A
Country	US
Kind code	B2
Filing date	May 11, 2023
Priority date	May 11, 2023
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A split piston ring unit may include a first ring body, a second ring body, and a spacer insert. The first ring body may define a first circumferential gap. The second ring body may define a second circumferential gap. The spacer insert may be coupled to the first ring body and the second ring body. The first ring body and the second ring body may be arranged coaxially and oriented in an offset orientation where the first circumferential gap and the second circumferential gap are disposed circumferentially offset from one another by an offset distance. The spacer insert may be disposed in the offset distance between the first circumferential gap and the second circumferential gap to maintain the offset orientation.

First claim

What is claimed is:

1. A split piston ring unit, comprising:
a first ring body defining a first circumferential gap;
a second ring body defining a second circumferential gap;
a spacer insert coupled to the first ring body and the second ring body;
the first ring body and the second ring body arranged coaxially and oriented in an offset orientation where the first circumferential gap and the second circumferential gap are disposed circumferentially offset from one another by an offset distance; and
wherein the spacer insert is disposed in the offset distance between the first circumferential gap and the second circumferential gap to maintain the offset orientation.

2. The split piston ring unit according to claim 1 , wherein:
the first ring body includes a first recess disposed at the first circumferential gap;
the second ring body includes a second recess disposed at the second circumferential gap;
the first recess and the second recess overlap one another; and
the spacer insert is disposed in the first recess and the second recess to separate the first circumferential gap from the second circumferential gap.

3. The split piston ring unit according to claim 2 , wherein the first recess and the second recess are disposed on a radially inner side of the first ring body and the second ring body, respectively.

4. The split piston ring unit according to claim 2 , wherein:
the first ring body has a first circumferential end face and a second circumferential end face defining the first circumferential gap therebetween;
the first recess opens into the first circumferential gap through the first circumferential end face of the first ring body;
the second ring body has a first circumferential end face and a second circumferential end face defining the second circumferential gap therebetween; and
the second recess opens into the second circumferential gap through the first circumferential end face of the second ring body.

5. The split piston ring unit according to claim 4 , wherein at least one of:
the first recess is defined by a first recess base surface of the first ring body and a first radially outwardly sloped surface of the first ring body extending from the first recess base surface to the first circumferential end face of the first ring body; and
the second recess is defined by a second recess base surface of the second ring body and a second radially outwardly sloped surface of the second ring body extending from the second recess base surface to the second circumferential end face of the second ring body.

6. The split piston ring unit according to claim 4 , wherein:
the first ring body extends from the first circumferential end face to the second circumferential end face in a first circumferential direction; and
the second ring body extends from the first circumferential end face to the second circumferential end face in a second circumferential direction opposite the first circumferential direction.

7. The split piston ring unit according to claim 1 , wherein the spacer insert includes:
a base body;
a first projection extending circumferentially from a first end of the base body; and
a second projection extending circumferentially from a second end of the base body.

8. The split piston ring unit according to claim 7 , wherein the first projection and the second projection protrude radially outward from the base body.

9. The split piston ring unit according to claim 8 , wherein the first projection and the second projection are angled radially outward and extend obliquely relative to the base body.

10. The split piston ring unit according to claim 1 , wherein the second ring body has a plasma-coated layer disposed thereon.

11. The split piston ring unit according to claim 1 , wherein:
the first ring body covers an axial end of the second circumferential gap; and
the second ring body covers an axial end of the first circumferential gap.

12. The split piston ring unit according to claim 1 , wherein at least one of the first ring body and the second ring body is at least one of a barrel-shaped outer diameter ring body and a tapered outer diameter ring body.

13. The split piston ring unit according to claim 1 , wherein:
the first ring body, the second ring body, and the spacer insert are movable relative to one another; and
relative movement of the first ring body, the second ring body, and the spacer insert is limited via the spacer insert.

14. A piston for a combustion engine, comprising at least one ring groove and a split piston ring unit arranged in the at least one ring groove, the split piston ring unit including:
a first ring body defining a first circumferential gap;
a second ring body defining a second circumferential gap;
a spacer insert coupled to the first ring body and the second ring body;
the first ring body and the second ring body arranged coaxially and oriented in an offset orientation where the first circumferential gap and the second circumferential gap are disposed circumferentially offset from one another by an offset distance; and
wherein the spacer insert is disposed in the offset distance between the first circumferential gap and the second circumferential gap to maintain the offset orientation.

15. The piston according to claim 14 , wherein:
the first ring body includes a first recess disposed at the first circumferential gap;
the second ring body includes a second recess disposed at the second circumferential gap;
the first recess and the second recess overlap one another; and
the spacer insert is disposed in the first recess and the second recess to separate the first circumferential gap from the second circumferential gap.

16. The piston according to claim 15 , wherein:
the first ring body covers an axial end of the second circumferential gap; and
the second ring body covers an axial end of the first circumferential gap.

17. The piston according to claim 14 , wherein the spacer insert includes:
a base body;
a first projection extending circumferentially from a first end of the base body; and
a second projection extending circumferentially from a second end of the base body;
wherein the first projection and the second projection are angled radially outward and extend obliquely relative to the base body.

18. An internal combustion engine, comprising at least one cylinder, a piston slidably arranged in the at least one cylinder, and a split piston ring unit arranged in a ring groove of the piston, the split piston ring unit including:
a first ring body defining a first circumferential gap;
a second ring body defining a second circumferential gap;
a spacer insert coupled to the first ring body and the second ring body;
the first ring body and the second ring body arranged coaxially and oriented in an offset orientation where the first circumferential gap and the second circumferential gap are disposed circumferentially offset from one another by an offset distance; and
wherein the spacer insert is disposed in the offset distance between the first circumferential gap and the second circumferential gap to maintain the offset orientation.

19. The internal combustion engine according to claim 18 , wherein:
the first ring body includes a first recess disposed at the first circumferential gap;
the second ring body includes a second recess disposed at the second circumferential gap;
the first recess and the second recess overlap one another; and
the spacer insert is disposed in the first recess and the second recess to separate the first circumf

Assignees

• Mahle Int Gmbh

Inventors

• Berghian Petru M
• Mendes De Araujo Fabio

Classifications

• F16J9/24

  Members preventing rotation of rings in grooves · CPC title

• F16J9/18

  with separate bridge-elements · CPC title

• F16J9/20 Primary

  Rings with special cross-section (L-section rings F16J9/02); Oil-scraping rings {(F16J9/06 takes precedence)} · CPC title

• F16J9/16 Primary

  obtained by stacking of rings · CPC title