The invention relates to a piston (10, 110, 210, 310, 410) for an internal combustion engine, comprising a piston crown (11) and a piston skirt (21), said piston crown (11) comprising a piston head (12), a peripheral top land (14), a peripheral annular zone (15) with annular grooves (16, 17, 18) and in the region of the annular zone (15), a peripheral cooling channel (19, 119, 419) which is open towards the base and which is closed by means of a closure element (35, 135, 235, 335, 435). Said cooling channel (19, 119, 419) has a cooling channel base (26, 126, 226, 326, 426) and a cooling channel cover (27), and the piston skirt (21) has two piston hubs (22) which are interconnected by means of two running surfaces (25a, 25b). According to the invention, the inner surface (37), exclusively a running surface (25a) of the piston (10, 110, 210, 310, 410) is connected to the lower side (11a) of the piston crown (11) by means of a connecting bar (38).

Piston for an internal combustion engine

A piston and method of construction is provided. The piston includes a top part fixed to a bottom part. The top part has an uppermost surface with annular inner and outer upper joining surfaces depending therefrom. The bottom part has a pair of pin bosses with pin bores aligned with one another along a pin bore axis; a pair of upwardly extending annular inner and outer lower joining surfaces and a combustion bowl wall. Inner and outer weld joints fix the inner and outer upper and lower joining surfaces to one another. An annular cooling gallery is formed laterally between the upper and lower joining surfaces. The inner weld joint joining the top part to the bottom part is located within the combustion bowl wall and configured to minimized the compression height of the piston.

Steel piston with cooling gallery and method of construction thereof

A multi-part piston for an internal combustion engine has an upper piston part having a piston crown, and a lower piston part. The lower piston part has pin boss supports and pin bosses connected with them and the upper piston part and the lower piston part each have an inner and an outer support element, which elements delimit an outer circumferential cooling channel. The inner support elements delimit a cavity that is open toward the pin bosses. The cavity has a separate cooling oil collector that has at least one cooling oil opening. The piston is produced by manufacturing the upper piston part and lower piston part, inserting the cooling oil collector into the upper piston part or lower piston part, and joining the upper and lower piston parts together by friction welding.

Multi-part piston for an internal combustion engine and method for its production

The present invention relates to a piston ( 10 ) for an internal combustion engine, which has a piston skirt ( 14 ) as well as a piston head ( 13 ) having a circumferential ring belt ( 21 ) and having a circumferential cooling channel ( 24 ) closed off with a closure element ( 26 ), wherein a circumferential recess ( 23 ) is formed between the piston head ( 13 ) and the piston skirt ( 14 ). According to the invention, it is provided that the closure element ( 26 ) consists of at least two subcomponents ( 27, 28 ), that each subcomponent ( 27, 28 ) has a radially oriented base plate ( 29 ) and at least one circumferential collar ( 31 ) oriented axially on the outer edge ( 29 a ) of the base plate ( 29 ), which collar is accommodated in at least one outer fold ( 34 ) that runs underneath the ring belt ( 21 ).

Die vorliegende Erfindung betrifft einen Kolben (10) fur einen Verbrennungsmotor mit einem Kolbenkopf (11) und einem Kolbenschaft (16) mit Kolbennaben (17), die jeweils mit einer Nabenbohrung (18) zur Aufnahme eines Kolbenbolzens versehen sind, wobei die Kolbennaben (17) die Form einer Trapez- oder stufenformigen Abstutzung aufweisen, bei der die Innenflachen (19) der Kolbennaben (17) einen spitzen Winkel (α) zur Kolbenmittelachse (M) einschliesen. Erfindungsgemas ist vorgesehen, dass jede Nabenbohrung (18) als Formbohrung ausgebildet ist, die zumindest in ihrem inneren Bereich aufgeweitet ist, derart, dass die Aufweitung sich in Richtung des inneren Endes (18') der Nabenbohrung (18) unter Ausbildung von Facetten (120, 220) auf der Mantelflache (18') der Nabenbohrung (18) vergrosert und dass die Facetten (120, 220) einen spitzen Winkel (α, s) zur Kolbenmittelachse (M) einschliesen.

Kolben für einen verbrennungsmotor

A method for the production of a piston made of steel, for an internal combustion engine, in which the upper piston part is produced using the forging method, and the lower piston part is produced using the forging or casting method, and they are subsequently welded to one another. To simplify the production method and make it cheaper, the upper piston part is forged using the method of hot forming and of cold calibration, to finish it to such an extent that further processing of the combustion bowl and of the upper cooling channel regions can be eliminated.

Method for the production of a piston for an internal combustion engine

A multi-part piston for an internal combustion engine has an upper piston part and a lower piston part. The upper piston part and the lower piston part each have an inner and an outer support element, which elements delimit an outer circumferential cooling channel and an inner cooling chamber, whose cooling chamber bottom has an opening. The opening is closed off with a separate closure element, which has at least one cooling oil opening

Multi-part piston for an internal combustion engine

A method for producing a piston for an internal combustion engine may include the steps of: producing a piston upper part from a first blank via a deformation process; producing a piston lower part from a second blank via at least one of a deformation process and a casting process; connecting the first blank of the piston upper part and the second blank of the piston lower part to form a piston body via a welding process; and performing at least one of a secondary machining process and a finish machining process of the piston body to produce the piston.

Method for producing a piston for an internal combustion engine and piston produced by said method

Pistons and methods of making the same are disclosed. An exemplary piston assembly may include a piston crown and skirt. The crown may include a crown collar wall extending downward toward a free end of the crown collar wall. The skirt may include a pair of oppositely disposed pin bosses that each define piston pin bores configured to receive a piston pin for securing a connecting rod between the pin bosses. The skirt may further include a radially inner skirt mating surface abutted along a radially inner interface region with the radially inner crown mating surface, and a radially outer skirt mating surface abutted along a radially outer interface region with the radially outer crown mating surface such that a cooling gallery is substantially enclosed. The skirt may further include an inner collar wall extending upwards to the free end of the crown collar wall.

Reiner Mueller

Papers

Method for the production of a piston for an internal combustion engine

Multi-part piston for an internal combustion engine

Method for producing a piston for an internal combustion engine and piston produced by said method

Piston with cooling gallery and closed collar chamber