DE102010023877A1 - Piston ring for reciprocating piston engine, has spreading element with ends arranged at distance from each other over protection element, where distance of ends is largely formed in circumferential direction than slot - Google Patents

Abstract

The ring has a ring element with abutment ends limiting a slot of the ring element in a circumferential direction of the ring element. An interior extent-side spreading element e.g. spring element such as hose spring, has abutment ends arranged at a distance from each other over a wear protection element (16) e.g. hollow cylinder, where the distance of the abutment ends of the spreading element is largely formed in the circumferential direction than the slot of the ring element. The protection element is made of plastic e.g. PTFE.

Description

The The invention relates to a piston ring for a piston Reciprocating piston specified in the preamble of claim 1 Art.

Such a piston ring is already the DE 7433666 U to be known as known. This piston ring comprises a fitting on its inner circumference expansion element and a mounted in the region on both sides of the piston ring butt, wear-inhibiting tool between the spreader and the piston ring. Adhesive is applied between the wear-inhibiting aids and the piston ring and / or the spreading element.

The DE 1425551 discloses a multi-piece oil scraper ring for engines, which consists of two slotted annular ridges and a radially and axially exciting expander ring and this is arranged in a piston groove. The joints of the annular webs are arranged in the highest region of the groove. The ring lands are secured against rotation by providing a plug connection between the piston and the expander ring consisting of a protruding part and a recess. These piston rings have further potential to reduce their wear.

It is therefore an object of the present invention, a piston ring of to provide the aforementioned type, which has a low wear.

These Task is by a piston ring for a piston the reciprocating engine solved with the features of claim 1. Advantageous embodiments and expedient and non-trivial developments of the invention are in the rest Claims specified.

One Such piston ring for a piston of a reciprocating engine comprises a ring element which has two butt ends, in the circumferential direction of the ring member, a slot of the ring member limit. Furthermore, the piston ring comprises an inner peripheral side in a receptacle of the ring element at least partially absorbed spreading element, which also has two butt ends, in the circumferential direction of the expansion element to limit a slot of the expansion element.

According to the invention provided that the butt ends of the expansion element over a bridging the slot of the ring member in the circumferential direction Wear protection element are spaced apart, wherein the distance of the butt ends of the expansion element in the circumferential direction is formed larger than the slot of the ring member in the circumferential direction.

The Wear protection element is for example made of plastic, For example, made of polytetrafluoroethylene (PTFE), and trained reduces the wear of the piston ring, in particular of the expansion element. Thus, the piston ring has only a very small Wear over a very long life, too at high loads in an internal combustion engine operation of the Reciprocating on. Costly and unwanted Repairs to replace the piston ring are thus avoided or reduced in number.

Of the Piston ring is formed for example as an oil scraper ring and has the primary task of lubricating oil from one To strip the tread of the piston, so that the lubricating oil not in a combustion chamber or in a cylinder of the reciprocating engine gets burned and thus unwanted emissions could cause.

The Spreader is, for example, as a spring element, in particular as a hose spring, formed. It causes a particularly advantageous Spread the ring element so that the ring element defines the tread of the piston rests and, for example, the Lubricating oil from the tread can strip.

In an advantageous embodiment of the invention is that Wear protection element designed as a hollow cylinder and surrounds the expansion element, in particular the hose spring, the outer peripheral side Completely. This avoids contact of the expansion element with the butt ends of the ring element, so that the piston ring a particularly low wear and therefore a very has a long service life.

advantageously, has the wear protection element on the outer peripheral side at least partially adapted to the inclusion of the ring element Counter contour on. This is the wear protection element safe and defined in the recording and against one unwanted movement or even secured against losing.

In a further embodiment, the piston ring comprises a fixing element, in particular a fixing wire, which penetrates spring coils of the spring element and through which the spring element is held in a ring shape. In this case, the preferably designed as a hollow cylinder wear protection element on the fixing this outside circumference arranged surrounding, wherein the butt ends of the expansion element are supported on corresponding end faces of the wear protection element. The piston ring is characterized by a particularly defined on the tread and the Schmierö l peel off this very well. At the same time, the piston ring has a particularly low wear and a very long service life, which is also associated with reduced warranty costs.

The Ring element advantageously has a longitudinal extent in the axial direction of the ring element and thus an axial ring height of at least substantially two millimeters. This holds the Required space of the piston ring and its weight low. Furthermore is the mold filling capacity of the thus formed Piston ring especially good.

Further Advantages, features and details of the invention will become apparent the following description of a preferred embodiment as well as the drawing. The above mentioned in the description Features and feature combinations as well as below in the figure description mentioned and / or shown in the figures alone features and Feature combinations are not only in the specified Combination, but also in other combinations or in isolation usable without departing from the scope of the invention.

there demonstrate:

1 a schematic plan view of a Fixierdrahts for a tube spring of a Ölabstreifrings, which is completely surrounded in a partial arc segment in the circumferential direction of a wear protection element;

2 a schematic plan view of a hose spring with the fixing wire according to 1 wherein the tubular spring is held in a ring shape by means of the fixing wire and wherein butt ends of the tubular spring are spaced from one another supported on the wear protection element;

3 a schematic plan view of a Ölabstreifrings with the fixing wire according to 1 and the hose spring according to 2 wherein a limited by two butt ends of a ring member of the oil control ring slot is bridged by the wear protection element.

The 1 shows a fixing wire 10 , by means of which a hose spring 12 ( 2 ) in a ring shape of the hose spring 12 to hold. Like in the 1 is highlighted by a region A, is the fixing wire 10 in a partial arc segment 14 in the circumferential direction of the fixing wire 10 with a wear protection element 16 Enclosed on the outer peripheral side.

The wear protection element 16 is designed as a hollow cylinder and made of polytetrafluoroethylene (PTFE) and in the axial direction of the wear protection element 16 according to a directional arrow 18 from the fixing wire 10 penetrated. The wear protection element 16 reduces wear of the hose spring 12 during its use as a spreading element for a piston ring 20 ( 3 ).

Again 2 can be seen, the hose spring 12 two butts 22 and 24 on, which in the circumferential direction of the hose spring 12 according to a directional arrow 26 a slot 28 the hose spring 12 limit. The butt ends 22 and 24 are at corresponding end faces of the wear protection element 16 supported and thus by means of the wear protection element 16 spaced apart. Again 2 can be clearly seen, is the hose spring 12 through the fixing wire 10 in one in the 2 shown ring shape held.

The 3 shows a piston ring 20 with a ring element 30 which also has two butt ends 32 and 34 having. The butt ends 32 and 34 limit in the circumferential direction of the ring member 30 according to a directional arrow 36 a slot 38 of the ring element 30 , In the piston ring 20 , which is designed as an oil scraper, is now the hose spring 12 with the fixing wire 10 and the wear protection element 16 inside circumference of the ring element 30 in a receptacle of the ring element 30 inserted, wherein the hose spring 12 by the inclusion of the ring element 30 is held. The hose spring 12 has the purpose of the ring element 30 in the radial direction according to a directional arrow 40 to spread, so that the ring element 30 abuts a cylinder surface of a cylinder of a reciprocating engine to strip lubricating oil from the cylinder surface. This is to prevent lubricating oil from entering a combustion chamber of the reciprocating engine, where it is burned and leads to undesirable emissions.

Again 3 it can be seen, is the hose spring 12 with the fixing wire 10 and on the fixation wire 10 arranged wear protection element 16 such in the ring element 30 or in its inclusion inserted that the wear protection element 16 the slot 38 bridged. The of the wear protection element 16 spaced butt ends 22 and 24 the hose spring 12 have a distance, which in the circumferential direction of the ring member 30 according to the directional arrow 36 is formed larger than the slot 38 of the ring element 30 , In other words, the wear protection element prevents contact of the hose spring 12 or their butt ends 22 and 24 with the ring element 30 or the butt ends 32 and 34 of the ring element 30 , This keeps the wear of the hose spring 12 especially in the Area A of the slot 28 respectively. 30 very low. This can be the hose spring 12 in this area no longer wear A or only very slightly.

This shows the piston 20 a very long life even at high loads in an internal combustion engine operation of the reciprocating engine. The likelihood of costly repairs or the number of such repairs is reduced. This is accompanied by a very long service life of the entire reciprocating engine and low warranty costs. The piston ring 20 can have only a very small axial ring height of, for example, two millimeters, whereby the piston ring 20 has a very small space requirement and a very low weight. This low weight and the small space requirement goes hand in hand with the possibility, also one to the piston ring 20 corresponding piston of the reciprocating engine low in its dimensions and low in its weight form. At the same time, the piston ring ensures 20 a very good function for stripping the lubricating oil from the cylinder surface, whereby oil consumption of the reciprocating engine can be kept low.

LIST OF REFERENCE NUMBERS

10

pinning

12

hose spring

14

Part arc segment

16

Wear protective element

18

arrow

20

piston ring

22

Thrust

24

Thrust

26

arrow

28

slot

30

ring element

32

Thrust

34

Thrust

36

arrow

38

slot

40

arrow

A

Area

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 7433666 U [0002]
• - DE 1425551 [0003]

Claims (7)

Piston ring ( 20 ) for a piston of a reciprocating engine, with a ring element ( 30 ), which has two butt ends ( 32 . 34 ), which in the circumferential direction ( 36 ) of the ring element ( 30 ) a slot ( 38 ) of the ring element ( 30 ), and with an inner peripheral side in a receptacle of the ring element ( 30 ) at least partially absorbed spreading element ( 12 ), which has two butt ends ( 22 . 24 ), which in the circumferential direction ( 26 ) of the expansion element ( 12 ) a slot ( 28 ) of the expansion element ( 12 ), characterized in that the butt ends ( 22 . 24 ) of the expansion element ( 12 ) over a slot ( 38 ) of the ring element ( 30 ) in the circumferential direction ( 26 . 26 ) bridging wear protection element ( 16 ) are spaced apart, wherein the distance of the butt ends ( 22 . 24 ) of the expansion element ( 12 ) in the circumferential direction ( 26 . 36 ) is larger than the slot ( 38 ) of the ring element ( 30 ). Piston ring ( 20 ) according to claim 1, characterized in that the. wear protection element ( 16 ) is formed at least substantially of a plastic, in particular of polytetrafluoroethylene. Piston ring ( 20 ) according to one of claims 1 or 2, characterized in that the expansion element ( 12 ) as a spring element ( 12 ), in particular as a hose spring ( 12 ), is trained. Piston ring ( 20 ) according to claim 3, characterized in that the spring element ( 12 ) by a spring coils of the spring element ( 12 ) penetrating fixing element ( 16 ), in particular a fixing wire ( 16 ), in a ring shape of the spring element ( 12 ) is held. Piston ring ( 20 ) according to claim 4, characterized in that the wear protection element ( 16 ) the fixing element ( 12 ) outside circumference, in particular completely, surrounds. Piston ring ( 20 ) according to one of claims 4 or 5, characterized in that the fixing element ( 16 ) in the extension direction of the fixing element ( 16 ) only partially within the wear protection element ( 16 ) is recorded. Piston ring ( 20 ) according to one of the preceding claims, characterized in that the wear protection element ( 16 ) on the outer peripheral side, at least in regions, to the receptacle of the ring element ( 30 ) has adapted counter contour.

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