Patents by Inventor Helmut Kollotzek
Helmut Kollotzek has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8733315Abstract: A soluble and substantially ring-shaped casting core may include a cooling channel in a piston having at least one inflow and at least one outflow. The casting core may form a closed ring and the inflow may be arranged directly adjacent to the outflow. The casting core may have a cross-sectional taper for forming a choke in the circumferential direction between the inflow and the outflow.Type: GrantFiled: May 24, 2012Date of Patent: May 27, 2014Assignee: Mahle International GmbHInventors: Helmut Kollotzek, Thomas Hettich, Frank Ehmann
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Publication number: 20120325166Abstract: A soluble and substantially ring-shaped casting core may include a cooling channel in a piston having at least one inflow and at least one outflow. The casting core may form a closed ring and the inflow may be arranged directly adjacent to the outflow. The casting core may have a cross-sectional taper for forming a choke in the circumferential direction between the inflow and the outflow.Type: ApplicationFiled: May 24, 2012Publication date: December 27, 2012Inventors: Helmut Kollotzek, Thomas Hettich, Frank Ehmann
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Patent number: 8122935Abstract: The invention relates to a soluble and essentially annular casting core (2) for forming a cooling channel that transitions into two areas (14, 15) which are approximately parallel to the piston axis (16) and are facing away from the piston head (3), via a respective bending of the core (17, 18) in the shape of a quadrant, wherein the second area (14) transitions into a part of the casting core (2) that forms the feed opening (12) of the cooling channel, and the first area (15) transitions into a part of the casting core (2) that forms the discharge opening (13) of the cooling channel. The two areas (14, 15) of the casting core (2) are disposed at a distance from one another, which corresponds at a maximum to two times the cross-sectional diameter of one of the two areas (14, 15). As a result, the throughflow of the cooling oil traversing the cooling channel is accelerated and the cooling of the piston improved.Type: GrantFiled: April 25, 2008Date of Patent: February 28, 2012Assignee: MAHLE International GmbHInventor: Helmut Kollotzek
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Patent number: 8079403Abstract: A soluble casting core for forming a cooling channel in a piston has a formed-on part for forming an oil supply opening and a formed-on part for forming an oil drain opening. In order to improve the mechanical strength of the piston, the oil supply opening and the oil drain opening lie in a different pin boss support of the pin bosses of the piston. A third formed-on part, which lies in the circumferential direction and is configured in oblong manner, is disposed between the first formed-on part and the end of the casting core, which part has a shape that narrows conically towards the end of the casting core and forms a continuation of the cooling channel, which narrows conically towards the end of the cooling channel.Type: GrantFiled: April 21, 2009Date of Patent: December 20, 2011Assignee: MAHLE International GmbHInventor: Helmut Kollotzek
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Publication number: 20110174245Abstract: Disclosed is a cooling duct (6) for a piston (1) of a combustion engine. The cooling duct (6) has an annular shape and comprises two openings (7, 8) which are arranged next to each other and are alternately used as inlets as well as at least one outlet (15, 16) on the side of the cooling duct (6) located radially opposite the openings (7, 8). In order to allow the oil to more easily flow through the cooling duct (6) and thus the piston (1) to be better cooled, the cooling duct (6) has two outlets (15, 16) that are arranged next to each other as well as a reduced cross-section (17) which lies between the two outlets and acts as a throttle.Type: ApplicationFiled: August 19, 2009Publication date: July 21, 2011Applicant: MAHLE INTERNATIONAL GMBHInventor: Helmut Kollotzek
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Publication number: 20110155091Abstract: The present invention relates to an inlay part (10, 110) for a piston of an internal combustion engine, wherein the piston has a piston head (21, 121) which is provided with a piston crown (22) which has a combustion depression (23), with an encircling fire land (24) and with an encircling ring part and with an encircling cooling duct (12) which is arranged at the level of the ring part. It is provided according to the invention that the inlay part (10, 11) is formed as a single-piece component which has an encircling cooling duct (12), a ring carrier region (11) and a depression region (13, 113) for a depression edge reinforcement. The present invention also relates to a piston or piston head (21, 121) provided with such an inlay part (10, 110).Type: ApplicationFiled: July 2, 2009Publication date: June 30, 2011Applicant: MAHLE International GmbHInventors: Helmut Kollotzek, Sven Schilling, Juergen Rudi
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Patent number: 7921555Abstract: A piston for an internal combustion engine has annular cooling passage arranged in the vicinity of the piston crown and radially on the outside, which, in those regions of the pin bosses which lie close to the boss holes, has boss cooling passages which are connected to the cooling passage and are intended for improved cooling of the pin bosses.Type: GrantFiled: December 15, 2006Date of Patent: April 12, 2011Assignee: Mahle International GmbHInventors: Arnold Benz, Helmut Kollotzek, Markus Leitl, Sven Schilling, Ernst Limbach, Josip Zvonkovic
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Patent number: 7900551Abstract: A piston for an internal combustion engine has an annular cooling channel provided with oil admission boreholes and oil discharge boreholes, the oil discharge boreholes being oriented in the direction of the bolt hubs for the cooling thereof.Type: GrantFiled: December 15, 2006Date of Patent: March 8, 2011Assignee: Mahle International GmbHInventors: Arnold Benz, Helmut Kollotzek, Markus Leitl, Sven Schilling, Ernst Limbach, Josip Zvonkovic
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Publication number: 20100163203Abstract: The invention relates to a soluble and essentially annular casting core (2) for forming a cooling channel that transitions into two areas (14, 15) which are approximately parallel to the piston axis (16) and are facing away from the piston head (3), via a respective bending of the core (17, 18) in the shape of a quadrant, wherein the second area (14) transitions into a part of the casting core (2) that forms the feed opening (12) of the cooling channel, and the first area (15) transitions into a part of the casting core (2) that forms the discharge opening (13) of the cooling channel. The two areas (14, 15) of the casting core (2) are disposed at a distance from one another, which corresponds at a maximum to two times the cross-sectional diameter of one of the two areas (14, 15). As a result, the throughflow of the cooling oil traversing the cooling channel is accelerated and the cooling of the piston improved.Type: ApplicationFiled: April 25, 2008Publication date: July 1, 2010Applicant: MAHLE INTERNATIONAL GMBHInventor: Helmut Kollotzek
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Publication number: 20090261232Abstract: A soluble casting core for forming a cooling channel in a piston has a formed-on part for forming an oil supply opening and a formed-on part for forming an oil drain opening. In order to improve the mechanical strength of the piston, the oil supply opening and the oil drain opening lie in a different pin boss support of the pin bosses of the piston. A third formed-on part, which lies in the circumferential direction and is configured in oblong manner, is disposed between the first formed-on part and the end of the casting core, which part has a shape that narrows conically towards the end of the casting core and forms a continuation of the cooling channel, which narrows conically towards the end of the cooling channel.Type: ApplicationFiled: April 21, 2009Publication date: October 22, 2009Inventor: Helmut Kollotzek
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Publication number: 20090025550Abstract: A piston for an internal combustion engine has annular cooling passage arranged in the vicinity of the piston crown and radially on the outside, which, in those regions of the pin bosses which lie close to the boss holes, has boss cooling passages which are connected to the cooling passage and are intended for improved cooling of the pin bosses.Type: ApplicationFiled: December 15, 2006Publication date: January 29, 2009Inventors: Arnold Benz, Helmut Kollotzek, Markus Leitl, Sven Schilling, Ernst Limbach, Josip Zvonkovic
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Publication number: 20090007776Abstract: A piston for an internal combustion engine has an annular cooling channel provided with oil admission boreholes and oil discharge boreholes, the oil discharge boreholes being oriented in the direction of the bolt hubs for the cooling thereof.Type: ApplicationFiled: December 15, 2006Publication date: January 8, 2009Inventors: Arnold Benz, Helmut Kollotzek, Markus Leitl, Sven Schilling, Ernst Limbach, Josip Zvonkovic
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Patent number: 5746169Abstract: In a light-metal piston for highly stressed internal combustion engines with a combustion chamber in the piston head, in order to keep the stresses at the edge of the combustion chamber low without unnecessarily increasing the stresses in the support and the gudgeon pin boss, the following features are provided in combination: the combustion chamber in the piston head is not reinforced; the drilling of gudgeon pin boss is widened (crowned) at and towards its inner end at least in a partial region X of its entire length; the drilling in each gudgeon pin boss is a shaped drilling widening conically from the outside at least in a partial region Z; the drilling of each gudgeon pin boss has two oblique wells running from its inner end.Type: GrantFiled: January 7, 1997Date of Patent: May 5, 1998Assignee: Mahle GmbHInventors: Wolfgang Issler, Helmut Kollotzek
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Patent number: 5653156Abstract: A light metal piston for highly stressed internal combustion engines has a combustion cavity in the piston head. In order to keep low the stresses at the edge of the combustion cavity without unnecessarily increasing the stresses in the support and hub of the piston pin, the piston has the following combination of characteristics: the combustion cavity (5) in the piston head (4) is not armoured; the bore (9) of each piston pin hub (8) is flared (cambered) towards the inner end of the hub in at toast the inner end (10) of a partial area X of the total length of the hub bore; the bore (9) of each piston pin hub (8) is designed as a molded bore (9) that is outwardly enlarged with a substantially conical shape at least in one partial area Z; the bore (9) of each piston pin hub (8) has on one side a slanted pocket (12) that starts at its inner end (10).Type: GrantFiled: September 7, 1995Date of Patent: August 5, 1997Assignee: Mahle GmbHInventors: Wolfgang Issler, Helmut Kollotzek