Back to results
US 10,502,158 B2Granted
Piston for a reciprocating-piston internal combustion engine
AssigneeMan Truck & Bus AG
InventorsThomas Malischewski, Jürgen Ritter
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to a piston for a reciprocating-piston internal combustion engine, comprising a piston head and a piston barrel, wherein the piston head has an encircling ring belt with at least one ring groove for a piston ring and has, in the region of the ring belt, an encircling cooling duct. The cooling duct extends from the ring belt as far as a wall of the piston barrel in order to increase an oil film temperature of the oil film in the cylinder liner between the piston barrel and cylinder and to thereby reduce the piston barrel friction.
Claims18
A piston for a reciprocating-piston internal combustion engine, comprising:
- a piston head including an encircling ring belt with at least one ring groove configured for receiving a piston ring;
- a piston barrel;
- a cooling duct including an encircling upper cooling duct portion formed in the region of the ring belt, and a lower cooling duct portion duct extending from the ring belt as far as a wall of the piston barrel;
- wherein the lower cooling duct portion is, in the region of the wall of the piston barrel, in fluid communication by way of at least one first passage opening to a cylinder liner for the piston;
- and
- an oil-catching rib arranged in the cooling duct such that a part of the oil flung back and forth in the cooling duct as a result of the piston movement strikes the oil-catching rib and is conducted by the oil-catching rib to the at least one first passage opening.
3 more elements
An arrangement, comprising:
- a) a piston including a piston head having an encircling ring belt with at least one ring groove configured for receiving a piston ring, a piston barrel, and a cooling duct including an encircling upper cooling duct portion formed the region of the ring belt, and a lower cooling duct portion extending from the ring belt as far as a wall of the piston barrel wherein the lower cooling duct portion is, in the region of the wall of the piston barrel, in fluid communication by way of at least one first passage opening to a cylinder liner for the piston;
- and an oil-catching rib arranged in the cooling duct such that a part of the oil flung back and forth in the cooling duct as a result of the piston movement strikes the oil-catching rib and is conducted by the oil-catching rib to the at least one first passage opening;
- b) a volume-flow-regulated lubricant pump which is provided for the supply of lubricant to the piston;
- and
- c) a control device of the lubricant pump, wherein the control device is designed such that, in a manner dependent on an operating parameter of an internal combustion engine, from which operating parameter the present engine load can be derived, said control device controls or regulates a lubricant volume flow for the supply of lubricant to the piston such that, in the presence of a first value of the operating parameter, which corresponds to a first engine load, a first volume flow is set, and in the presence of a second value of the operating parameter, which corresponds to a second engine load greater than the first engine load, a second volume flow is greater than the first volume flow.
2 more elements
A motor vehicle, comprising:
- a reciprocating-piston internal combustion engine;
- at least one piston including, a piston head having an encircling ring belt with at least one ring groove configured for receiving a piston ring;
- a piston barrel;
- a cooling duct comprising an encircling upper cooling duct portion formed in the region of the ring belt, and a lower cooling duct portion wherein the cooling duct extends from the ring belt as far as a wall of the piston barrel, wherein the lower cooling duct portion is, in the region of the wall of the piston barrel, in fluid communication by way of at least one first passage opening to a cylinder liner for the piston;
- and
- an oil-catching rib arranged in the cooling duct such that a part of the oil flung back and forth in the cooling duct as a result of the piston movement strikes the oil-catching rib and is conducted by the oil-catching rib to the at least one first passage opening.
3 more elements
Dependencies are inferred from the claim text.