Engine piston
First Claim
1. A piston for an internal combustion engine, comprising a piston skirt and piston bosses formed with piston pin holes, wherein said piston skirt is so shaped as to define therewithin a cavity having a width parallel to said piston pin holes that vertically varies in such a manner as to become smaller adjacent said piston bosses and larger above and below said piston bosses.
1 Assignment
0 Petitions
Accused Products
Abstract
A piston skirt has narrowed relief sections adjacent piston bosses and between first and second relief sections. The first relief sections extend between a piston head and respective piston bosses whist the second relief sections extend downward from the respective piston bosses. The narrowed relief sections are spaced from each other in parallel to piston pin holes at a distance which is smaller than that at which the first and second relief sections are space from each other, respectively. The narrowed relief sections are formed thicker and therefore more rigid than the first and second relief sections so that the piston skirt is more rigid adjacent the piston bosses and less rigid above and below the piston bosses, whereby to effectively lessen side thrust of the piston to the cylinder wall without deteriorating the durability.
-
Citations
12 Claims
- 1. A piston for an internal combustion engine, comprising a piston skirt and piston bosses formed with piston pin holes, wherein said piston skirt is so shaped as to define therewithin a cavity having a width parallel to said piston pin holes that vertically varies in such a manner as to become smaller adjacent said piston bosses and larger above and below said piston bosses.
- 6. A piston for an internal combustion engine, comprising a piston head, a piston skirt and piston bosses formed with piston pin holes, wherein said piston skirt has on thrust sides thereof bearing portions for contact with an associated cylinder wall of the engine and on piston boss sides thereof relief portions which are located radially more inward than said bearing portions, said relief portions having vertically separated first and second relief sections, said first relief sections extend between said piston head and said piston bosses whilst said second relief sections extend downward from said piston bosses, said relief portions further having narrowed relief sections adjacent said piston bosses and between said first and second relief sections.
Specification