Crankshaft and cranktrain for internal combustion engine

A crankshaft comprising:

• a main journal surrounded by a main bearing defining a groove configured to be provided with oil from an oil gallery and at least one oil inlet formed in the main journal configured to provide oil from the groove into the main journal;
• a first crankpin journal connected to a first side of the main journal by way of a first web and a second crankpin journal connected to an opposite, second side of the main journal by way of a second web;
• and
• a pair of crankpin bearings provided around each of the first and second crankpin journals, each crankpin bearing configured to support a piston rod thereon;
• wherein each of the first and second crankpin journals has a pair of oil outlets formed therein, each oil outlet configured to provide oil to a respective crankpin bearing;
• wherein oil passageways in the crankshaft are configured to provide the pairs of oil outlets in both the first and second crankpin journals with oil from the main journal;
• and
• wherein each oil outlet in the pairs of oil outlets is located between 20 and 60 degrees from top-dead-center of the respective first or second crankpin journal in which the oil outlet is formed.

A cranktrain comprising:

• a crankshaft comprising a first crankshaft section having:
• a first main journal surrounded by a first main bearing defining a groove configured to be provided with oil from an oil gallery and at least one oil inlet formed in the first main journal configured to provide oil from the groove into the first main journal;
• a first crankpin journal connected to a first side of the first main journal by way of a first web and a second crankpin journal connected to an opposite second side of the first main journal by way of a second web;
• a first pair of crankpin bearings provided around the first crankpin journal;
• and
• a second pair of crankpin bearings provided around the second crankpin journal;
• a first pair of rods and associated pistons provided on the first pair of crankpin bearings, respectively;
• a second pair of rods and associated pistons provided on the second pair of crankpin bearings, respectively;
• a second crankshaft section of the crankshaft having:
• a second main journal surrounded by a second main bearing defining a groove configured to be provided with oil from the oil gallery and at least one oil inlet formed in the second main journal configured to provide oil from the groove into the second main journal;
• a third crankpin journal connected to a first side of the second main journal by way of a third web and a fourth crankpin journal connected to an opposite second side of the second main journal by way of a fourth web;
• a third pair of crankpin bearings provided around the third crankpin journal;
• and
• a fourth pair of crankpin bearings provided around the fourth crankpin journal;
• a third pair of rods and associated pistons provided on the third pair of crankpin bearings, respectively;
• and
• a fourth pair of rods and associated pistons provided on the fourth pair of crankpin bearings, respectively;
• wherein both of the first and second crankpin journals have a pair of oil outlets formed therein, each oil outlet configured to provide oil to a respective crankpin bearing;
• wherein oil passageways in the crankshaft are configured to provide the pairs of oil outlets in both the first and second crankpin journals with oil from the first main journal;
• wherein each of the third and fourth crankpin journals has a pair of oil outlets formed therein, each oil outlet configured to provide oil to a respective crankpin bearing;
• wherein additional oil passageways in the crankshaft are configured to provide the pairs of oil outlets in both the third and fourth crankpin journals with oil from the second main journal;
• and
• wherein the first and second crankshaft sections are separated by a third main journal having no oil inlet formed therein.

A cranktrain comprising:

• a crankshaft comprising a first crankshaft section having:
• a main journal surrounded by a main bearing defining a groove configured to be provided with oil from an oil gallery and at least one oil inlet formed in the main journal configured to provide oil from the groove into the main journal;
• a first crankpin journal connected to a first side of the main journal by way of a first web and a second crankpin journal connected to an opposite second side of the main journal by way of a second web;
• a first pair of crankpin bearings provided around the first crankpin journal;
• and
• a second pair of crankpin bearings provided around the second crankpin journal;
• a first pair of rods and associated pistons provided on the first pair of crankpin bearings, respectively;
• and
• a second pair of rods and associated pistons provided on the second pair of crankpin bearings, respectively;
• wherein both of the first and second crankpin journals have a pair of oil outlets formed therein, each oil outlet configured to provide oil to a respective crankpin bearing;
• wherein oil passageways in the crankshaft are configured to provide the pairs of oil outlets in both the first and second crankpin journals with oil from the main journal;
• and
• wherein the at least one oil inlet is located between 50 and 70 degrees from top-dead-center of at least one of the first and second crankpin journals.

A cranktrain comprising:

• a crankshaft comprising a first crankshaft section having:
• a main journal surrounded by a main bearing defining a groove configured to be provided with oil from an oil gallery and at least one oil inlet formed in the main journal configured to provide oil from the groove into the main journal;
• a first crankpin journal connected to a first side of the main journal by way of a first web and a second crankpin journal connected to an opposite second side of the main journal by way of a second web;
• a first pair of crankpin bearings provided around the first crankpin journal;
• and
• a second pair of crankpin bearings provided around the second crankpin journal;
• a first pair of rods and associated pistons provided on the first pair of crankpin bearings, respectively;
• and
• a second pair of rods and associated pistons provided on the second pair of crankpin bearings, respectively;
• wherein both of the first and second crankpin journals have a pair of oil outlets formed therein, each oil outlet configured to provide oil to a respective crankpin bearing;
• wherein oil passageways in the crankshaft are configured to provide the pairs of oil outlets in both the first and second crankpin journals with oil from the main journal;
• and
• wherein each oil outlet in the pairs of oil outlets is located between 20 and 60 degrees from top-dead-center of the respective first or second crankpin journal in which the oil outlet is formed.