Low-height articulated piston with skirt-overhanging guide porti

Details Low-height articulated piston with skirt-overhanging guide porti Low-height articulated piston with skirt-overhanging guide porti

1987-08-04

1989-07-04

Garrett, Robert E.

Expansible chamber devices

Piston

With separable means for pivotally mounting connecting rod...

92237, 92238, 92239, F16J 102, F16J 116

Patent

active

048439525

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to pistons especially pistons for internal combustion engines.
2. Description of the Prior Art
Such pistons are known from Fed. German P.S. No. 2,351,994. A low compression height of the piston is achievable due to the fact that a ring band of the piston head surrounds the skirt whereby the piston pin can be placed so far upwards in the piston skirt that the upper zone of the skirt bore receiving the piston pin can come to lie above the lowermost piston ring groove in the piston head.
In pistons of such formation it can occur that in specific cases, especially those where the lateral guidance of the connection rod takes place in the piston head, with a low height of the cylindrical guide portion of the piston head there is no longer adequate lateral guidance of the piston head in the direction of the axis of the piston pin.


SUMMARY OF THE INVENTION

The object of the present invention is to provide a remedy of this defect.
According to the invention a piston comprises
a head part having a substantially cylindrical surface for sliding engagement within the inner cylindrical surface of a cylinder bore of an interal combustion engine, gudgeon pin bosses extending from said head part and spaced radially inwardly of said cylindrical surface, said bosses having coaxial skirt part lying within a projection of the cylindrical surface and surrounding the gudgeon pin bosses, said skirt part having axial bores therein coaxial with the bores of the bosses, and a gudgeon pin passing through the bores of said bosses and said skirt to secure the skirt pasrt to the head part, the improvement comprising the provision of
(a) two oppositely diposed flat surfaces of said skirt through which pass the axial bores, said flat surfaces being substantially parallel to each other and form chords of the projected cylindrical surface, defining with the latter segmental spaces, and
(b) guide portions integral with the head overhanging the exterior of the skirt by at least 10% of the longitudinal length of the skirt and located adjacent the opposite ends of the pin against said flat surfaces of said skirt, said guide portions extending in a direction away from said head into the segmental spaces and having part circular recesses permitting passage of the gudgeon pin on assembly.
Also from Fed. German P.S. No. 1,291,955 a piston is already known in which the skirt extends out far above the pin bosses lying therebeneath. However this construction is not comparable with the construction according to the invention, since piston head and skirt are not separate from one another.


BRIEF DESCRIPTION OF THE DRAWINGS

An example of embodiment of the invention is illustrated in the accompanying drawing, wherein:
FIG. 1 shows a piston partially in longitudinal section and partially in elevation,
FIG. 2 shows a lateral elevation of the piston,
FIG. 3 shows a section through the piston along the line III--III on FIG. 2 .


DESCRIPTION OF THE PREFERRED EMBODIMENT(S)

The piston is composed of a piston head 1 and a piston skirt 2. These two parts are connected with one another by a piston pin (not shown) which engages in boss bores 3 of the piston head 1 and bores 4 in the piston skirt 2. At opposite ends of the piston pin a guide portion 5 on each side extends from the piston head 1 radially out beyond the skirt 2 and extends in the direction of the piston axis approximately to the level of the piston pin axis. Openings for the passage of the piston pin are provided in these guide portions 5 which overhang the skirt 2. The guide portions 5 extend beyond the lower edge of the head part in the direction of the piston axis, at least 10%, preferably at least 20% and preferably by about 40% of the length of the piston skirt 2. In the circumferential direction the region in which the guide portion 5 overlaps the skirt 2 measures about 60.degree., the portion 5 extending in each case symmetrically in relation to each side of the piston pin axis.
The skirt 2 adjacent opposite ends

REFERENCES:
patent: 1221419 (1917-04-01), Clark
patent: 1559800 (1925-11-01), Spillman
patent: 1772931 (1930-08-01), Dusevoir
patent: 1926329 (1933-09-01), Chilton
patent: 3452649 (1969-07-01), Cornet
patent: 3971355 (1976-07-01), Kottman
patent: 3987709 (1976-10-01), Day
patent: 4180027 (1979-12-01), Taylor
patent: 4702151 (1987-10-01), Munro et al.

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