Internal-combustion engines – Particular piston and enclosing cylinder construction – Piston
Patent
1997-05-08
1998-06-09
Okonsky, David A.
Internal-combustion engines
Particular piston and enclosing cylinder construction
Piston
92208, F02B 7526, F02F 322
Patent
active
057620385
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a piston and connecting rod arrangement for internal combustion engines having: an upper piston part including a piston bottom, a fire land and a ring land; a lower piston part which forms the shaft; and a spherical connecting rod end. The spherical connecting rod end is slidingly supported with an upper spherical segment in a spherical-segmental indentation in the underside of the piston bottom, and with a lower spherical segment surrounding a connecting rod in a spherical-layer-like indentation of a retaining ring connected to the inside of the piston shaft.
Piston and connecting rod arrangements of this kind are distinguished by good rectilinear guidance of the piston, a comparatively short piston shaft, an absolutely axially symmetrical thermal expansion, and little play between the piston and the cylinder travel path.
German published Patent Application DE A 4 016 723 describes a piston and connecting rod arrangement for internal combustion engines that comprises a cast aluminum alloy piston with and upper and lower part and a ball-like connecting rod end.
On the side remote from the connecting rod, in a spherical-segmental indentation of the underside of the piston bottom and in the region bordering the connecting rod, the connecting rod end is supported in a swivel-bearing-like retaining ring that is detachably connected to the piston shaft and comprises two halves that are joined together by cotter pins. Located on the outer circumference of the retaining ring, in its lower portion and immediately opposite above the bottleneck of the piston shaft, is a turned groove, which is provided with a thread on the side of the piston shaft. A threaded ring is rotated into the hollow-cylindrical recess formed by the turned groove, in such a way that the retaining ring is braced against the collar cast onto the inside of the piston shaft. Producing the piston and connecting rod arrangement requires joining together multiple components that are manufactured to close tolerances with joining fits.
SUMMARY OF THE INVENTION
It is an object of the present invention to furnish a piston and connecting rod arrangement of the type referred to at the outset in which the mechanical structure of the joining parts is easy to assemble and in which these parts can be assembled in only a few assembly operations.
This object is attained according to the present invention by providing a recess of a snoutlike cross section which is mounted between the upper and lower spherical segments and/or in that one or more flats are provided between the upper and lower spherical segments of the connecting rod end.
Particularly as a result of the embodiment according to the present invention of the connecting rod end, the effort and expense of assembly for producing the piston and connecting rod arrangement is markedly reduced; the demands for tolerances and tight fits can be comparatively lower. Moreover, a marked reduction in weight is attained by means of the recessing and flattening of the connecting rod end.
The insertion of the connecting rod into the piston is made easier in that the axes of symmetry of the connecting rod end and connecting rod are preferably offset from and parallel to one another, and/or the diameter of the smaller opening of the retaining ring connected to the piston shaft is manufactured larger in at least one sector than in the remaining circumferential region.
In terms of further details of the embodiment of the piston and connecting rod arrangement, the piston is joined together from an upper part and a lower part, which are connected by soldering, welding, shrinkage, screwing, adhesive bonding, or the like; expediently, the bearing faces for the connecting rod end and the fitting surfaces of the piston components undergo their final machining prior to the joining operation.
The upper part of the piston can include the fire land, ring land, piston bottom, and the upper portion of the piston shaft. To make it possible to reach the connecting rod en
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patent: 5094195 (1992-03-01), Gonzalez
patent: 5560332 (1996-10-01), Chang
Kolbenschmidt AG
Okonsky David A.
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