# US 4,398,507 A · Connecting rod spray orifice for cooling of a piston > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,398,507 A - Document ID: US4398507A - Status: Granted - Kind: A - Application number: 06/314,132 - Filed: 1981-10-23 - Granted: 1983-08-16 - Earliest claimed: 1981-10-23 - Assignees: Allis-Chalmers Corporation - Inventors: James F. Belsanti - Web page: https://patentgrep.com/patent/US4398507A ## CPC - F01M 1/06: Lubricating systems characterised by the provision therein of crankshafts or connecting rods with lubricant passageways, e.g. bores (crankshafts, connecting-rods, per se F16C) - F01P 3/06: Arrangements for cooling pistons - F01M: LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING - F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28) ## Abstract Connecting rod orifices spray oil on the underside of a piston of an internal combustion engine. The orifices are constructed to produce a wide spray evenly distributed across the underside of the piston beneath the combustion chamber in the internal combustion engine. ## Claims ### Claim 1 A hydraulic fluid cooling system for an internal combustion engine comprising, a source of pressurized fluid, a crankshaft having passage means connected to said source of pressurized fluid, a connecting rod having passage means connected to said passage means in said crankshaft, a piston, a wrist pin bearing connecting said piston to said connecting rod, an orifice means on said wrist pin bearing connected to said passage means in said connecting rod, said orifice means on said wrist pin bearing including a shorter axial length dimension than the cross-sectional dimension across the orifice thereby providing a widely diverging spray on the underside of said piston. ### Claim 2 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said orifice defines a circular cross-section, the length of said orifice over the diameter of said orifice is less than unity. ### Claim 3 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein the length of the orifice is slightly less than the cross-sectional width of said orifice. ### Claim 4 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 including, means defining a longitudinal axis of said connecting rod, means defining central axis of said orifice means angularly displaced relative to the longitudinal axis of said connecting rod for uniformly sweeping across all of the undersurface of said piston as said piston moves downwardly and the cooling fluid is discharged from said orifice. ### Claim 5 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said orifice is angularly displaced from the longitudinal center of said connecting rod. ### Claim 6 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 including, a crank pin bearing connecting said crankshaft to said connecting rod, valve means in the crank pin bearing for spraying cooling fluid on the underside of said piston on the downward stroke of said piston. ### Claim 7 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said connecting rod defines a longitudinal center line, said piston defining a center line, said orifice means define a central axis, means angularly offsetting the central axis of said orifice relative to the longitudinal center of said connecting rod for sweeping to both sides of said piston center line during the downward stroke of said piston. ### Claim 8 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said piston defines a combustion chamber immediately above said orifice means on said wrist pin bearing, said orifice means includes a plurality of orifices. ### Claim 9 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said connecting rod defines a longitudinal axis, said orifice means in said wrist pin bearing including a plurality of orifices defining axes angularly offsetting relative to said longitudinal axis of said connecting rod for providing a spray across a wide area of the undersurface of said piston. ### Claim 10 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said orifice means defines a drilled cylindrical opening, a countersunk portion determining the effective length of the orifice and for providing a wide spray. ### Claim 11 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein the orifice means defines a cylindrical opening, a recessed portion on the radially outer end of said cylindrical opening for providing a ratio of length over diameter of less than unity. ### Claim 12 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said orifice means defines a cylindrical opening, a countersink end portion determining the effective length of said orifice means causing the length over diameter ratio of said orifice to be less than unity. ### Claim 13 (depends on 1) A hydraulic fluid cooling system for an internal combustion engine as set forth in claim 1 wherein said orifice means includes a drilled opening on the radially inner end, a countersunk outer end on said orifice means determining the effective length of said orifice.