DE7617370U1 - PISTONS, IN PARTICULAR FOR COMBUSTION MACHINERY - Google Patents

Description

HOFFMANN · EITLE & PARTNER

PATENTANWÄLTE DR.INO, E, HOFFMANN ■ DIPL ₁ -INQ, W, EITLE · DR, RER, NAT, K, HOFFMAN N ■ DIPL.-ING, W, LEH N D-BOOO MÖNCHEN Bl. ARABB LLASTRASS E 4 (STERNHAUS) TELEPHONE (089) 911087 VElEX 05-29619 (PATHE)

Alcan Aluminumwerk Nürnberg GmbH, Mürnborg

Pistons, in particular for internal combustion engines

The innovation relates to pistons, especially for internal combustion engines, with a ring carrier and an approximately in Height of the ring carrier provided in the piston head, which serves as a heat transfer barrier. Such pistons are in several Embodiments known. There is an annular cavity at a more or less large distance from the inside of the Provide ring carrier in the piston head. The manufacture of such Piston presents considerable difficulties in practice, in particular due to the need for the tube forming the channel with an oval cross-section, for example, to be reliably fixed in the piston mold before casting the piston.

The object of the innovation is to provide pistons with an annular channel provided in the piston head at the level of the ring carrier

^{hV /:} -VO 07.10.76

The object of the innovation is to provide pistons with an annular channel provided in the piston head at the level of the ring carrier to design so that the manufacture of the piston is simplified by casting. According to the innovation, this is achieved by that the tube forming the ring channel is connected to the inner wall of the ring carrier by soldering or welding. The ring carrier and the ring channel can only be connected to one another at individual points on the circumference.

In a preferred embodiment, the inner wall of the ring carrier itself forms part of the wall of the Ring channel, while the part of the wall of the ring channel not formed by the ring carrier is covered by a sheet metal ring with im substantially semicircular or U-shaped cross-section is formed, the edges of which with the ring carrier, e.g. by welding or soldering, tightly vprb "nd ° n.

In order to ensure a secure and tight connection between the sheet metal ring forming the channel and the ring carrier, the latter has expediently on its top and bottom flat turns, in which the tightly connected to the ring carrier engage both edges of the sheet metal ring. The cross-section of the sheet metal ring forming the channel can be, for example, semicircular or be oval, it can have a greater height than the ring carrier due to corresponding bulges in its cross-section.

In the drawing, pistons with the features of the innovation are shown in several exemplary embodiments. All figures show the part of the piston that receives the ring carrier in a vertical cross section.

Fig. 1 shows a piston head 1 with a for dia recording

7617370 07.io.ft

a ring formed ring carrier 2, the inner wall of which by a web 4 with the outer wall of the ring channel * 3 connected is. This web 4 can be formed by welding or soldering.

Fig. 2 shows a similar arrangement in a piston head 1 with a ring carrier 5, which is for receiving two piston rings is trained. It is sufficient that the ring carrier 2 or 5 and the ring channel 3 serving as a heat transfer barrier only to individual points of their scope are connected to one another.

Fig. 3 shows a piston head in which the inner wall of the ring carrier 10 is part of the wall of the ring channel forms, while the part of the wall of the ring channel not formed by the ring carrier is formed by a sheet metal ring 6 with an approximately semicircular Cross-section is formed. Flat turns 7 are provided on the top and bottom of the ring carrier 10, in which the two edges of the sheet metal ring 6 welded to the ring carrier engage.

Fig. 4 shows a similar embodiment. Here has the Sheet metal ring 8 has a greater height than the ring carrier 10 due to a bulge 9 in its cross section.

7617370 10/7/76

Claims (6)

Protection claims 1 . Pistons, especially for internal combustion engines, with a ring carrier and one at the level of the ring carrier in the piston head provided ring channel as a heat transfer barrier, characterized in that the ring channel (3) forming Tube is connected by soldering or welding (4) to the inner wall of the ring carrier (2,5). 2. Piston according to claim 1, characterized in that g e k e η η, that the ring carrier (2.5) and the ring channel (3) serving as a thermal barrier only at individual points of the Are connected to each other. 3. Piston according to claim 1, characterized marked CHN e t that the inner wall of the ring carrier (10) forms part of the wall of the Rinqkanal. 4. Piston according to claim 3, characterized in that the part of the wall not formed by the ring carrier of the annular channel of a sheet metal ring (6,8) with a substantially semicircular or U-shaped cross-section is aebilden, whose Edges are tightly connected to the ring carrier (10), e.g. by welding or soldering. 5. Piston according to claims 3 or 4, characterized in q e, that the ring carrier (10) has flat turns (7) on its top and bottom, in which engage the two edges of the sheet metal ring (6,8), which are tightly connected to the ring carrier. 6. Piston according to one of the claims 3 to 5, characterized in that the cross section of the sheet metal ring (8) by bulges (9) has a greater height than the ring carrier (10). 7617370 10/7/76