Two-Part Piston Having an Open Cooling Channel
First Claim
1. A piston of an internal combustion engine, formed from a bottom part and a top part, having a piston crown and a cooling passage, wherein the bottom part is connected to the top part by a materially bonding connection, characterized in that the bottom part has a bottom part flat joint region with at least one recess and the top part has a top part flat joint region and an annular recess which extends from the top part flat joint region into the bottom part, wherein the at least one recess of the bottom part is in overlapping alignment with a section of the top part annular recess after the materially bonding connection.
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Accused Products
Abstract
An internal combustion engine piston formed by a lower part connected to an upper part through a form-fitting connection. In one example, the piston lower part has a flat joining area with at least one recess and the piston upper part has a flat joining area including an annular recess. The upper part annual recess extends from the joining area into the lower part, wherein the at least one recess of the lower part is in overlap with a partial area of the annular recess in the upper part after the form-fitting connection. In one example, a sealing element is used between the upper part and the lower part.
13 Citations
13 Claims
- 1. A piston of an internal combustion engine, formed from a bottom part and a top part, having a piston crown and a cooling passage, wherein the bottom part is connected to the top part by a materially bonding connection, characterized in that the bottom part has a bottom part flat joint region with at least one recess and the top part has a top part flat joint region and an annular recess which extends from the top part flat joint region into the bottom part, wherein the at least one recess of the bottom part is in overlapping alignment with a section of the top part annular recess after the materially bonding connection.
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8. An internal combustion engine piston comprising:
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a bottom part having a planar joining region defining at least one recess; a top part having a top surface and a bottom surface opposite the bottom part planar joining region, the top part defining a through annular recess, the bottom surface having a planar joining region radially aligned with a portion of the bottom part planar joining region, the top part bottom surface further defining a radial recess axially extending toward the top surface, wherein on permanent attachment of the top part to the bottom part, the top part radial recess is positioned in radial and angular alignment with a portion of the bottom part at least one recess forming a coolant channel. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification