DE102009025691A1 - Piston for internal combustion engine, particularly reciprocating internal combustion engine, has upper piston area, which has ring carrier with ring groove and piston bowl - Google Patents

Abstract

The piston (10) has an upper piston area (12), which has a ring carrier (14) with a ring groove (16,18,20) and a piston bowl (22), and has a lower piston area (24), which has a piston skirt (26) and a hub (28) for receiving a piston pin. The ring carrier and the piston skirt are formed by a piston section (32), and the piston bowl is formed by another piston section (34). The latter piston section is sectionally accommodated by the former piston section. The piston is formed of steel.

Description

The The invention relates to a piston for an internal combustion engine according to the preamble of claim 1.

A generic piston is from the EP 1 419 328 B1 known. This piston for a diesel engine has a piston body, which is made of steel. A piston skirt of this piston is integrally formed with connecting projections for piston pins and has an upper end portion which in turn has a lower edge defining a lowermost part of the piston skirt in the longitudinal direction of the piston body, the lower edge being below a pin bore axis and at the bottom lying tangency point of bolt holes or above it is arranged.

The DE 1 2007 005 268 A1 discloses a piston which consists of a piston upper part and a piston lower part, wherein in the region of the upper piston part, a ring element is provided, which is designed as a separate component and connected to a piston body via joints.

The DE 102 44 512 A1 discloses a multi-piece piston for an internal combustion engine, which consists of a piston upper part with a piston recess and a ring portion and a piston lower part, wherein the piston recess and the ring portion are integrally formed and connected to the piston lower part via corresponding joints.

A similar piston is also from the DE 10 2004 061 778 A1 known, which also consists of a piston upper part and a piston lower part, wherein in the region of a piston upper part a piston recess and a ring field are formed from a one-piece component, which is connected to the piston lower part via corresponding joints.

The known solutions have the disadvantage that a design a cooling channel for piston cooling in an upper Area of such a piston is realized only insufficient.

It is therefore an object of the present invention, a piston of the above be further developed such that an improved Cooling of the piston is possible.

These Task is by a piston for an internal combustion engine solved with the features of claim 1.

One such piston for an internal combustion engine, in particular a reciprocating engine, with an upper piston area, which a ring carrier with at least one annular groove and a piston recess and with a lower piston portion which is a piston skirt and a hub for receiving a piston pin draws According to the invention characterized in that the ring carrier and the piston skirt through a first piston part and the piston recess are formed by a second piston part, which at least partially is received by the first piston part. So that means that the ring carrier and the piston skirt through the first piston part are integrally formed, which the second piston part, which forms the piston recess, at least partially receives. By This embodiment is an optimal design of a Cooling channel for piston cooling between the ring carrier and the piston recess possible, resulting in a significantly improved cooling of the piston allows. This results in the advantage that the piston according to the invention as a result of the improved Cooling is more resilient.

moreover allows the piston according to the invention a representation of a higher-load piston by a use of higher-strength materials to strong charged areas.

The the first piston part and the second piston part are for example by a thermal joining method, in particular a welding method, or by at least one screw connection or by a friction welding process connected with each other.

Possible Manufacturing method of the first piston part and the second piston part are for example a casting, a sintering, a Forging or the like.

Of the piston according to the invention, which for example made of steel, allows a representation of a low piston height, resulting in a low weight of the Piston results because for a contribution of the cooling channel no clearance between the ring carrier and the piston skirt must exist.

Farther is the piston according to the invention advantageous in that as he with different internal combustion engine variants with same piston dimensions but different compression ratios (Epsilon) only a slight change of his even requires. So it is only the piston recess, so that adapt the second piston part to the respective internal combustion engine variant, while the first piston part with the ring carrier and can be maintained unchanged with the piston skirt.

At It should be noted that advantageously also the hub and the first piston part are integrally formed, ie the first piston part also includes the hub of the piston. The above described modularity of the invention Kolben goes along with a significant cost reduction, since the Pistons as described mostly for different Internal combustion engine variants can be maintained.

A further cost reduction and a higher piston load are further realized by that by a multi-part the piston is an insert of different materials and / or manufacturing processes for the piston recess and / or for the ring carrier, the hub and the piston skirt are possible.

Further Advantages, features and details of the invention will become apparent the following description of a preferred embodiment as well as from the drawings. The above in the description mentioned features and feature combinations and the following mentioned in the description of the figures and / or in the figures alone shown features and feature combinations are not only in the each specified combination, but also in other combinations or used alone, without the scope of the invention to leave.

The Drawings show in:

1 a sectional perspective view of a piston for an internal combustion engine with a first piston part and a second piston part and

2 in sections, a longitudinal sectional view of the piston according to 1 ,

The 1 shows a piston 10 for an internal combustion engine with an upper piston area 12 which is a ring bearer 14 with three ring grooves 16 . 18 and 20 and a piston recess 22 having.

In addition, the piston includes 10 a lower piston area 24 , which is a piston shirt 26 , a hub 28 for receiving a piston pin and a ring land 30 having.

Again 1 it can be seen, are the ring carrier 14 , the piston shirt 26 and the ringwalk 30 through a first piston part 32 formed integrally while the piston recess 22 through a second piston part 34 is formed, wherein the second piston part 34 through the first piston part 32 is included. The second piston part 34 So it is in the first part of the piston 32 used and via appropriate connection points 36 and 37 for example, connected by a welding process with this.

Between the piston recess 22 or the second piston part 34 and the ring bearer 14 or the first piston part 32 is a cooling channel 38 provided, which by the design of the piston 10 is shown in an optimal way, whereby optimum cooling of the piston 10 is possible.

In the 2 like reference characters designate like elements as in FIG 1 ,

The 2 illustrates a multi-part of the piston 10 , in which therefore the first piston part 32 with the second piston part 34 over the connection points 36 and 37 for example, connected by a welding process. Of the 2 can be seen particularly clearly is a favorable Darstellbarkeit the cooling channel 38 for optimum cooling of the piston 10 , whereby a higher piston load of the piston 10 is possible.

10

piston

12

upper piston area

14

Ringbearer

16

ring groove

18

ring groove

20

ring groove

22

piston bowl

24

lower piston area

26

skirt

28

hub

30

ring land

32

first piston part

34

second piston part

36

junction

37

junction

38

cooling channel

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

• EP 1419328 B1 [0002]
• - DE 12007005268 A1 [0003]
• - DE 10244512 A1 [0004]
• DE 102004061778 A1 [0005]

Claims (6)

Piston ( 10 ) for an internal combustion engine, in particular a reciprocating piston engine, with an upper piston area ( 12 ), which a ring carrier ( 14 ) with at least one annular groove ( 16 . 18 . 20 ) and a piston recess ( 22 ), and with a lower piston area ( 24 ), which is a piston shirt ( 26 ) and a hub ( 28 ) for receiving a piston pin, characterized in that the ring carrier ( 14 ) and the piston skirt ( 26 ) by a first piston part ( 32 ) and the piston recess ( 22 ) by a second piston part ( 34 ) are formed, which at least partially by the first piston part ( 32 ) is recorded. Piston ( 10 ) according to claim 1, characterized in that the hub ( 28 ) and the first piston part ( 32 ) are integrally formed. Piston ( 10 ) according to one of claims 1 or 2, characterized in that between the first piston part ( 32 ) and the second piston part ( 34 ) at least one cooling channel ( 38 ) is provided. Piston ( 10 ) according to one of the preceding claims, characterized in that the first piston part ( 32 ) and the second piston part ( 34 ) are connected by a thermal joining method, in particular a welding method. Piston ( 10 ) according to one of the preceding claims, characterized in that the first piston part ( 32 ) and the second piston part ( 34 ) are connected by at least one screw connection Piston ( 10 ) according to one of the preceding claims, characterized in that the piston ( 10 ) is formed essentially of steel.