KS Kolbenschmidt GmbH

Neckarsulm, Germany

KS Kolbenschmidt GmbH

Neckarsulm, Germany
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Patent
KS Kolbenschmidt GmbH | Date: 2015-07-02

The invention relates to a cooling-channel piston for an internal combustion engine, having an upper part and a lower part, wherein the upper part and the lower part are connected to one another by way of a cohesive joint in the form of a weld seam, and the upper part and the lower part form an annularly encircling cooling channel which is arranged approximately behind a ring section, wherein a gap geometry is provided between a lower edge of the ring section and an upper edge of the lower part, wherein the gap geometry has at least one sliding surface which is arranged on a lower edge of the ring section of the cooling-channel piston and/or on the corresponding upper edge of the lower part of the cooling-channel piston, and to several methods for the operation of a cooling-channel piston.


The invention relates to a piston (1), in particular for an internal combustion engine, having a piston lower part (2) and a piston upper part (3), having an internally situated, preferably ring-shaped cooling channel (5), and having at least one inlet opening (10) arranged on the piston lower part (2) and at least one outlet opening (11) arranged on the piston lower part (2), via which inlet opening and outlet opening an inflow of coolant into and an outflow of coolant out of the cooling channel (5) take place, wherein the at least one inlet opening (10) and/or the at least one outlet opening (11) are/is formed by a rim hole (12), and the latter is formed integrally with the piston lower part (2), wherein the at least one rim hole (12) has a screw thread (14) into which at least one tubular element (15, 115) is inserted. The invention also relates to a method for regulating the coolant level in a cooling channel (5) of a piston (1), in particular for internal combustion engines, which has at least one inlet opening (10) and/or outlet opening (11) in the cooling channel (5), formed by a rim hole (12), wherein the coolant level in the cooling channel (5) is set by way of an adjustable tubular element (15, 115).


The invention relates to a piston (1, 100, 200, 300) for internal combustion engines, comprising a ring field (3), a shaft (4) and pin boss bores (5) and at least one cooling chamber (7) with oil guiding surfaces (10), at least one oil guiding surface (10) having a slope and to a method for cooling said piston (1, 100, 200, 300).


A method for producing a cooling channel system for an internal combustion engine, which has a cooling channel in the piston crown. The piston crown is adjoined by a lower piston part having a piston boss, pin bores and piston skirts. Firstly, a piston blank having a peripheral collar projecting radially in the region of the piston crown is produced, wherein the collar, forming a subsequent ring zone wall is then reshaped and, in a transition area between the piston crown and the lower piston part, a contact area for the collar is formed, and the collar is reshaped in such a way until the outer radially peripheral edge comes very close to or completely into contact with the contact area in order to form a closed cooling channel. Following the reshaping, the end region of the ring zone wall forms a defined gap (X) with respect to the upper edge of the piston skirt.


The invention relates to a piston (1, 100) for internal combustion engines, comprising a ring field (3), a shaft (4) as well as pin boss bores (5) and a cooling chamber (8) which is open in the direction of the pin boss bores (5). The invention also relates to a method for cooling said piston (1, 100).


Patent
KS Kolbenschmidt GmbH | Date: 2017-05-10

The invention relates to a cooling-channel piston (1, 100) for an internal combustion engine, having an upper part (2, 102) and a lower part (3, 103), wherein said two parts (2, 3; 102, 103) are connected to one another by way of a cohesive joint in the form of a weld seam (11), and said two parts (2, 3; 102, 103) form an annularly encircling cooling channel (6) which is arranged approximately behind a ring section (4), wherein a gap geometry (13, 113) is provided between a lower edge (16) of the ring section (4) and an upper edge (17) of a lower part (3, 103), wherein the gap geometry (3, 113) has at least one sliding surface (19) which is arranged on a lower edge (16) of the ring section (4) of the cooling-channel piston (1, 100) and/or on the corresponding upper edge (17) of a lower part (3, 103) of the cooling-channel piston (1, 100), and to several methods for the operation of a cooling-channel piston.


A method for producing a piston of an internal combustion engine and to a piston produced according to the method having a piston crown with annular grooves, a combustion-chamber bowl, and piston shaft having a pin bore for receiving a pin, wherein both a combustion-chamber rim and a combustion-chamber bowl base are melted and thereafter solidified.


A method for producing a cooling channel system for an internal combustion engine, which has a cooling channel in the piston crown. The piston crown is adjoined by a lower piston part having a piston boss, pin bores and piston skirts. Firstly, a piston blank having a peripheral collar projecting radially in the region of the piston crown is produced, wherein the collar, forming a subsequent ring zone wall is then reshaped and, in a transition area between the piston crown and the lower piston part, a contact area for the collar is formed, and the collar is reshaped in such a way until the outer radially peripheral edge comes very close to or completely into contact with the contact area in order to form a closed cooling channel. Following the reshaping, the end region of the ring zone wall forms a defined gap (X) with respect to the upper edge of the piston skirt.


A method for processing a constructed, liquid-cooled piston of an internal combustion engine, the piston including an upper piston part and a lower piston part, which are supported by a joining plane and are connected to each other in a bonded manner. An electrochemical method, such as electrochemical machining, is used to produce a passage opening or a hole in the piston. By means of the method, material is selectively removed after the completion of the upper part piston, the lower piston part, or the piston after the two piston parts have been joined. The electrochemical machining allows an arbitrarily geometrically designed topography having at least one passage opening, a hollow, or an oil pocket in cooling areas or non-cooling areas to be created on the piston.


Patent
Ks Kolbenschmidt Gmbh | Date: 2015-07-09

A cooling channel piston for an internal combustion engine which includes a piston bottom and a piston shaft that are joined thereto of a friction welding process. The piston bottom and the piston shaft jointly form a cooling channel. An annular wall which radially delimits the cooling channel towards the outside is formed by the piston bottom and/or the piston shaft. The annular wall can be sealed by a welding process once the piston bottom and the piston shaft have been joined together.

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