Light plunger piston for internal combustion engines
First Claim
1. A light plunger piston for internal combustion engines, especially gasoline engines for passenger automobiles, comprisinga piston having a head with ring grooves, a skirt having hub bores and a pin, whereinL/D=0.45-0.8H/D=0.25-0.5A/D=0.3-0.5T/D=0.45-0.8 whereL=maximum length of the pistonD=maximum diameter of the pistonH=compression heightA=maximum skirt height below the bottom ring groove in a peripheral area having the approximate same skirt height of at least 45 degrees on the major thrust face of said piston with approximately symmetrical division of this area on both sides of a plane extending perpendicular to the pin axis and passing through the longitudinal axis of said piston,T=diametrically opposite distance between the hub bore ends located radially on the outside, and whereinsaid skirt bulging along the axis of the piston and having an oval cross-section, with the large diameter of the oval oriented perpendicular to the pin axis;
- an axis of the hub bores being offset slightly towards the major thrust face;
said piston includes a horizontal slit, which separates the head from the skirt, located on the minor thrust face side of a plane extending through the longitudinal axis of said pin, and said piston;
said skirt having greater ovality on the minor thrust face side than on the major thrust face side in a polar plane perpendicular to the piston axis;
the minor thrust face side of said skirt being structured to bulge less in its upper area, adjacent to the bottom ring groove, than the major thrust face;
said skirt being longer on the major thrust face than on the minor thrust face; and
the wall thickness of the piston on the major thrust face being greater than on the minor thrust face.
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Accused Products
Abstract
A piston having a head with ring grooves, a skirt having hub bores, and a pin, with the following dimensions:
L/D=0.45-0.8
H/D=0.25-0.5
A/D=0.3-0.5
T/D=0.45-0.8
where
L=maxium length of the piston
D=maximum diameter of the piston
H=compression height
A=maximum skirt height below the bottom ring groove in a peripheral area having the approximate same skirt height of at least 45 degrees on the major thrust face of the piston with approximately symmetrical division of this area on both sides of a plane extending perpendicular to the pin axis and passing through the longitudinal axis of the piston,
T=diametrically opposite distance between the hub bore ends located radially on the outside.
The skirt bulges along the axis of the piston and has an oval cross-section. An axis of the hub bores is offset slightly towards the major thrust face. The piston includes a horizontal slit, which separates the head from the skirt. In a polar plane perpendicular to the piston axis the skirt has a greater ovality on the minor thrust face. The minor thrust face side of the skirt is structured to bulge less in its upper area, adjacent to the bottom ring groove. The skirt is longer on the major thrust face. The wall thickness is greater on the major thrust face.
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Citations
3 Claims
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1. A light plunger piston for internal combustion engines, especially gasoline engines for passenger automobiles, comprising
a piston having a head with ring grooves, a skirt having hub bores and a pin, wherein L/D=0.45-0.8 H/D=0.25-0.5 A/D=0.3-0.5 T/D=0.45-0.8 where L=maximum length of the piston D=maximum diameter of the piston H=compression height A=maximum skirt height below the bottom ring groove in a peripheral area having the approximate same skirt height of at least 45 degrees on the major thrust face of said piston with approximately symmetrical division of this area on both sides of a plane extending perpendicular to the pin axis and passing through the longitudinal axis of said piston, T=diametrically opposite distance between the hub bore ends located radially on the outside, and wherein said skirt bulging along the axis of the piston and having an oval cross-section, with the large diameter of the oval oriented perpendicular to the pin axis; -
an axis of the hub bores being offset slightly towards the major thrust face; said piston includes a horizontal slit, which separates the head from the skirt, located on the minor thrust face side of a plane extending through the longitudinal axis of said pin, and said piston; said skirt having greater ovality on the minor thrust face side than on the major thrust face side in a polar plane perpendicular to the piston axis; the minor thrust face side of said skirt being structured to bulge less in its upper area, adjacent to the bottom ring groove, than the major thrust face; said skirt being longer on the major thrust face than on the minor thrust face; and the wall thickness of the piston on the major thrust face being greater than on the minor thrust face. - View Dependent Claims (2, 3)
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Specification