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A technology for internal combustion engines and pistons, applied in the field of internal combustion engine pistons, can solve difficult and impossible problems, and achieve the effect of improving cooling efficiency
Inactive Publication Date: 2015-04-22
MAHLE INT GMBH
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[0003] The problem here is that it is very difficult or even impossible to introduce other structures in the cooling channel to improve the cooling efficiency
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[0023] figure 1 A particularly preferred embodiment of the piston 10 according to the invention is shown. The piston 10 has a piston base body 11 and a piston ring part 12 . The two components may be constructed of any metallic material suitable for component joining. The piston base body 11 and the piston ring part 12 together form a piston crown 13 and a piston skirt 14 of the piston 10 . In the present exemplary embodiment, the piston 10 is a piston with a so-called thermally insulated piston skirt, ie an annular groove 15 is arranged between the piston head 13 and the piston skirt 14 . However, the invention also enables the use of piston skirts (attached image 3 and 4 ).
[0024] The piston skirt 14 has, in a known manner, a hub 16 and a hub bore 17 for receiving a piston pin (not shown), as well as an active surface 18 .
[0025] The piston base body 11 also forms, in the region of the piston head 13 , an inner part 19 a of the piston crown and a piston crown rece...
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Abstract
The present invention relates to a piston (10, 110, 210, 310) for an internal combustion engine having a piston head (13) and a piston skirt (14), the piston (10, 110, 210, 310) comprising a piston base (11, 111, 211, 311) and a piston ring element (12, 112, 212, 312), the piston head (13) having a combustion recess (21, 121, 221). The invention is characterized in that the piston ring element (12, 112, 212, 312) has a portion (19b) of a piston crown, a circumferential fire land (22) and a circumferential ring section (23) with ring grooves, in that the piston base (11, 111, 211, 311) and the piston ring element (12, 112, 212, 312) form a circumferential cooling channel (24, 124, 224, 324) that extends between an inner lateral surface (25, 125, 225) in the region of the combustion recess (21, 121, 221) and an outer lateral surface (26, 126, 226, 326) in the region of the ring section (23), in that in the cooling channel (24, 124, 224, 324) on the outer lateral surface (26, 226) at least one flow guide element (31, 331) and / or on the inner lateral surface (125, 225) at least one heat conducting element (132, 232) is provided; and in that the piston base (11, 111, 211, 311) and the piston ring element (12, 112, 212, 312) have a circumferential seam (28) in the region of the piston crown (19a, 19b), via which they are non-detachably connected to one another.
Description
technical field [0001] The invention relates to a piston for an internal combustion engine, the piston comprising a piston head and a piston skirt, wherein the piston has a piston base body and a piston ring part, wherein the piston head has a piston crown recess. Background technique [0002] German patent application DE 10 2011 111 319.7 discloses a piston with reduced structural height, which consists of a piston base body and a piston ring part and has a crown recess, wherein the piston base body and piston ring part are recessed in the piston crown. In the region of the pit there is an annular seam via which the two parts are inseparably connected to one another. [0003] The problem here is that it is very difficult or even impossible to introduce other structures in the cooling channel for improving the cooling efficiency. Contents of the invention [0004] The object of the present invention is to further improve a piston of this type, so that the piston can produ...
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