DE102008032937A1 - Oil scraping piston ring comprises base body with bearing surface formed by bearing surface bar, and inner peripheral surface is provided with groove - Google Patents

Abstract

The oil scraping piston ring (1) comprises a base body (2) with a bearing surface formed by a bearing surface bar. An upper flank (5), a lower flank (6), and an inner peripheral surface (4) are provided, where the inner peripheral surface is provided with a groove (7). A hose spring (8) is provided inside the groove.

Description

The The invention relates to a Ölabstreifkolbenring, at least including a tread, an inner peripheral surface and upper and lower flanks, which are in operative connection with a Hose spring is.

Ölabstreifkolbenringe, which are in operative connection with a hose spring and tread with side a wear protection layer, in particular a chromium layer are provided, obtained by the hose spring even when using round annealed springs an increased contact pressure at the butt ends. Depending on the material the mating surface (cylinder wall, cylinder liner) From customer side again and again rills on the mating surface objected.

In the DE 1 292 447 a Ölabstreifring for engine pistons is described which has a, causing his voltage resting in an annular coil spring ring. The helical spring ring receiving annular groove has a shallow recess in the region of the annular joint. By this measure, the wear of the coil spring ring is to be reduced without the sealing effect of the piston ring is impaired.

Of the Invention is based on the object, a Ölabstreifkolbenring, which is in operative connection with a hose spring, such to modify that contact pressure at the butt ends can be reduced.

These The object is achieved by an oil control piston ring, including a main body with one, in particular by at least one tread web formed, tread, a grooved inner peripheral surface, upper and lower flanks and a hose spring provided inside the groove, wherein the base body provided with a predetermined wall thickness is and at specifiable location of the ring cross-section has a shock as well as the wall thickness of the main body, starting from the side opposite the kick, in direction the butt ends tapered, leaving the hose spring opposite the tread with defined eccentricity positioned within the groove.

advantageous Further developments of the subject invention are the dependent claims refer to.

advantageously, the wall thickness of the base body tapers, starting from the opposite of the shock Side (ring back), towards the butt ends continuously.

The Inventive wall thickness reduction in the opposite shock the ring back leads to the desired change in curvature in the butt area, pushing out the butt ends reduced by the hose spring.

Ölabstreifkolbenringe, for example, a center offset (eccentricity) 0.15 mm, get a 0.3 mm larger Chipping path and thereby a larger change in curvature at the push as in the ring back.

The Eccentricity is article specific and of the dependent hose spring dependent.

Of the Subject of the invention is based on an embodiment shown in the drawing and is described as follows. It demonstrate:

1 and 2 Different views of the Ölabstreifkolbenringes invention;

3 Section according to line AA of 2 ;

4 Section according to line BB of 2 ,

1 shows a Ölabstreifkolbenring 1 including a main body 2 , the two tread bars 3 having. The main body 2 furthermore has an inner circumferential surface 4 as well as an upper flank 5 and a lower edge 6 , Inside a groove 7 in the area of the inner peripheral surface 4 of the basic body 2 is a hose spring 8th positioned. At the circumference of the main body 2 are distributed oil drain holes 9 intended.

2 shows a plan view of the main body 2 , Visible is the upper flank 5 as well as the tread bar 3 , The main body 2 is with a push 10 Mistake. Further recognizable is the groove 7 as well as the hose spring arranged therein 8th ,

From the pictorial representation it can be seen that the wall thickness of the main body 2 , starting from the push 10 opposite side 11 , in the direction of the buttocks 12 . 13 , in this example continuous, rejuvenated. The wall thickness reduction in the push 10 opposite to the push 10 opposite side 11 (Ring back) leads to a predeterminable change in curvature in the shock area, the pushing out of the butt ends 12 . 13 through the hose spring 8th reduced.

The 3 and 4 show sections according to the lines AA ( 3 ) and BB ( 4 ). It can be seen that the wall thickness a, as in the area of the ring back 11 is formed larger than that b in the push 10 ,

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 1292447 [0003]

Claims (3)

Oil scraper piston ring, comprising a main body ( 2 ) with a, in particular by at least one tread web formed tread, one with a groove ( 7 ) provided inner peripheral surface ( 4 ), upper ( 5 ) and lower flanks ( 6 ) as well as one within the groove ( 7 ) provided hose spring ( 8th ), where the basic body ( 2 ) is provided with a predeterminable wall thickness and at specifiable location of the ring cross section a shock ( 10 ) and the wall thickness of the main body ( 2 ), starting from the shock ( 10 ) opposite side ( 11 ), in the direction of the butt ends ( 12 . 13 ), so that the hose spring ( 8th ) opposite the tread ( 3 ) with defined eccentricity (E) within the groove ( 7 ) is positioned. Oil scraper ring according to claim 1, characterized in that the wall thickness of the base body ( 2 ), starting from the shock ( 10 ) opposite side ( 11 ), in the direction of the butt ends ( 12 . 13 ) continuously rejuvenated. Oil scraper ring according to claim 1, characterized characterized in that by the eccentricity (E) (a-b) defined center offset depending on the piston ring diameter and the wall thickness is between 0.1 and 2 mm.