Connecting rod insert bearing for internal combustion engines

Claim 2

A connectinrg rod insert bearing comprising two semi-circular sections the ends of which are designed to be placed in abutting relation with the ends of the other to form a complete circle, both end portions of each section being rabbetted on its inner face the full width of the section to form a thin terminal portion with a shoulder spaced back from the end, the shoulders of the abutting ends being parallel such that each two abutting ends together provide a transverse oil groove of uniform width from one edge to the other of the bearing insert with the shoulders forming parallel boundaries of the grooves and the areas of the sections removed from the thin end portions immediately adjacent the shoulders form crank bearing surfaces immediately adjacent the grooves, the inner and outer surfaces of each sectioN between the shoulders at opposite ends being smooth and free of any recesses or cavities.

Claim 3

In a multiple cylinder engine with a rotatable crank shaft having a crank portion with an axial oil passage therein and radial oil passages extending in opposite directions from the axial one to the periphery thereof and a connecting rod having an end encircling said crank portion and wherein the connecting rod and crank are on dead center when the connecting rod is reversing its direction of travel, the invention comprising: a. a crank shaft connecting rod bearing insert fitted into said end of the connecting rod and surrounding said crank portion, said bearing comprising two like semi-circular sections with their confronting ends in abutting relation, each section having a rabbetted end portion across the full width thereof providing a recessed terminal area on the inner face of each end, the recessed terminal areas of confronting ends providing together a transverse lubricant escape groove of uniform width transversely across the entire inner surface of the two sections into the middle of which oil flows from one each of said radial passages on each revolution of the crank shaft, all of the rabbetted areas being bounded by a transverse shoulder with the shoulders all being parallel and forming boundaries along each side of the grooves and with the area of said sections removed from the recessed terminal portions but immediately adjacent said shoulders providing at all times a bearing surface for the crank portion, b. each section being of uniform thickness in the portion between the shoulder at one end and the shoulder at the other end, c. the two sections being so positioned in the connecting rod that the two grooves are 180* apart and each is 90* from the dead center position of the connecting rod and crank portion of the crank shaft.

Claim 4

In a multiple cylinder engine with a rotatable crank shaft having a crank portion with an axial oil passage therein and radial oil passages extending in opposite directions from the axial one to the periphery thereof and a connecting rod having an end encircling said crank portion and wherein the connecting rod and crank are on dead center when the connecting rod is reversing its direction of travel, the invention comprising: a. a crank shaft connecting rod bearing insert fitted into said end of the connecting rod and surrounding said crank portion, said bearing comprising two like semi-circular sections with their confronting ends in abutting relation, each section having a rabbetted end portion across the full width thereof providing a recessed terminal area on the inner face of each end, the recessed terminal areas of confronting ends providing together a transverse lubricant escape groove of uniform width transversely across the entire inner surface of the two sections into the middle of which oil flows from one each of said radial passages on each revolution of the crank shaft, all of the rabbetted areas being bounded by a transverse shoulder with the shoulders all being parallel and forming boundaries along each side of the grooves and with the area of said sections removed from the recessed terminal portions but immediately adjacent said shoulders providing at all times a bearing surface for the crank portion, b. each section being of uniform thickness in the portion between the shoulder at one end and the shoulder at the other end, c. the two sections being so positioned in the connecting rod that the two grooves are 180* apart and each is 90* from the dead center position of the connecting rod and crank portion of the crank shaft.

Claim 5

The invention defined in claim 2 wherein the insert has slight clearance in the direction of the length of the connecting rod but not in a direction at right angles thereto for the crank to move within the sleeve when the crank shaft and connecting rod are cold, the thickness of the sections in a radial direction between said end portions being substantially uniform and with the inner face free of any residue-retaining cavities.