Patent ID: 11885378
Assignee: nan
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. An inline four-cylinder engine, comprising:
four piston assemblies arranged in a line and each connected to a crankshaft, each one of the piston assemblies including:
a piston having a head and a connecting boss extending from a bottom of the head;
a piston connecting frame member having a top boss that is centrally located on the piston connecting frame member and that is coupled to the connecting boss of the piston, the piston connecting frame member further having a pair of lateral portions extending outward in opposing directions, each lateral portion having a vertical end face with a respective vertical linear bearing mounted on the vertical end face, the piston connecting frame member further having a bottom on which a bottom linear bearing is mounted;
wherein the piston connecting frame member includes a pair of vertical side extensions, each one of the vertical side extensions mounted on a respective one of opposing sides of the piston connecting frame member, and having a lower portion that extends inward, under the bottom linear bearing, and wherein the lower portion of each vertical side extension include a linear bearing under the bottom linear bearing on the bottom of the piston connecting frame member, wherein the lateral rail of the crank connecting member is captured between the bottom linear bearing and the linear bearings on each of the vertical side extensions; and
a crank connecting member having a lateral rail at a top of the crank connecting member, and a journal opening configured to receive a crank throw of the crankshaft therein, wherein the lateral rail is captured at the bottom of the piston connecting frame member and reciprocates laterally along the bottom of the piston connecting frame member.