Two-part oil control ring having axial stabilization and twist compensation

Patent metadata

Field	Value
Publication number	US-10871228-B2
Application number	US-201716331217-A
Country	US
Kind code	B2
Filing date	Jul 5, 2017
Priority date	Sep 8, 2016
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

The present invention relates to a two-part oil scraper ring, which comprises an L-shaped base body and an axial stabilization element. The L-shaped base body has a ring flank leg, which is pressed against a piston ring groove flank by the axial stabilization element, and a bearing surface leg, on which a scraping web is arranged. A twist compensation is attained by means of a suitable selection—and in particular variation—of hearing surface leg length, ring flank leg length and axial position of the scraping web.

First claim

The invention claimed is:

1. A two-part oil scraper ring comprising axial stabilization, comprising a base body ( 4 ) comprising an essentially L-shaped cross section, which has a bearing surface leg ( 8 ) and a ring flank leg ( 10 ), which together form two legs of the L-shaped cross section, and
an axial stabilization element ( 6 ), which is arranged so as to bear at least partially on the ring flank leg ( 10 ),
wherein a scraping web ( 12 ) is arranged so as to be located externally on the bearing surface leg ( 8 ),
wherein the stabilization element ( 6 ) is elastic in the axial direction, and
wherein an axial length (L) of the bearing surface leg ( 8 ) is smaller than an overall axial height (H) of the two-part oil scraper ring, wherein
the axial length (L) of the bearing surface leg ( 8 ) varies in the circumferential direction.

2. The two-part oil scraper ring according to claim 1 , wherein the axial length (L) of the bearing surface leg ( 8 ) is in the range of between 15% and 75%, of an overall axial height (H) of the two-part oil scraper ring.

3. The two-part oil scraper ring according to claim 1 , wherein the radial length (R) of the ring flank leg ( 10 ) lies in the range of between 20% and 100%, of a radial thickness (D) of the two-part oil scraper ring.

4. The two-part oil scraper ring according to claim 1 , wherein the radial length (R) of the ring flank leg ( 10 ) varies in the circumferential direction.

5. The two-part oil scraper ring according to claim 1 , wherein, wherein the scraping web ( 12 ) is arranged on the crankcase-side end of the bearing surface leg ( 8 ).

6. The two-part oil scraper ring according to claim 1 , wherein the scraping web ( 12 ) is arranged on the combustion chamber-side end of the bearing surface leg ( 8 ).

7. The two-part oil scraper ring according to claim 1 , wherein the axial position of the scraping web ( 12 ) on the bearing surface leg ( 8 ) varies in the circumferential direction.

8. The two-part oil scraper ring according to claim 1 , wherein the base body ( 4 ) has a twist in the non-installed state.

9. The two-part oil scraper ring according to claim 8 , wherein the twist of the base body ( 4 ) varies in the circumferential direction, wherein the twist is stronger on the ring back ( 14 ) than on the joint ends ( 16 ).

10. The two-part oil scraper ring according to claim 1 , wherein the radial height (S) of the scraping web ( 12 ) varies in the circumferential direction.

11. The two-part oil scraper ring according to claim 1 , wherein the axial stabilization element ( 6 ) is a meander spring, or wherein the axial stabilization element ( 6 ) is designed as L-shaped or rectangular tubular spring.

12. The two-part oil scraper ring according to claim 1 , wherein the axial stabilization element ( 6 ) has a free length, which is greater than a length of the piston ring groove, in which the two-part oil scraper ring is to be used.

13. The two-part oil scraper ring according to claim 1 , wherein the inner edge, at which the inner surface of the bearing surface leg ( 8 ) strikes the inner surface of the ring flank leg ( 10 ), has a rounding or an indent.

14. The two-part oil scraper ring according to claim 1 , wherein the non-installed two-part piston ring has an overall axial height (H), which is greater than an axial width of the piston ring groove, in which it is to be used.

15. The two-part oil scraper ring of claim 2 , wherein the range is between 20% and 60%.

16. The two-part oil scraper ring of claim 2 , wherein the range is between 25% and 45%.

17. The two-part oil scraper ring of claim 3 , wherein the range is between 50% and 90%.

18. The two-part oil scraper ring of claim 2 , wherein the range is between 15% and 85%.

Assignees

• Fed Mogul Burscheid Gmbh

Inventors

• Ruch Fabian
• Barenreuter Dirk

Classifications

• F16J9/06

  using separate springs {or elastic elements} expanding the rings; Springs therefor {; Expansion by wedging} · CPC title

• F16J9/02 Primary

  L-section rings · CPC title