Embodiments are directed toward an engine. In some embodiments, the engine includes a water pump and a balancer shaft. In some embodiments, the water pump has a plain bearing. In some embodiments, plain bearing is supplied with pressurized oil. In some embodiments, the balancer shaft drives the water pump as well as cam shafts.

The present disclosure relates to a device for lubricating an internal combustion engine having a crankshaft, which is connected to at least one connecting rod. The device has at least one first flow limiter, in particular a restrictor, for reducing a lubricating fluid flow of a lubricating fluid stream passed to the at least one first flow limiter. The device has a plurality of crankshaft bearings for the rotatable support of the crankshaft, wherein the plurality of crankshaft bearings is provided in fluid communication downstream of the at least one first flow limiter. The device has at least one big end bearing for the rotatable support of the at least one connecting rod, wherein the at least one big end bearing is provided in fluid communication downstream of at least one crankshaft bearing of the plurality of crankshaft bearings.

Embodiments are directed toward an engine. In some embodiments, the engine includes a water pump and a balancer shaft. In some embodiments, the water pump has a plain bearing. In some embodiments, plain bearing is supplied with pressurized oil. In some embodiments, the balancer shaft drives the water pump as well as cam shafts.

A cylinder block has a different amount of oil supply for each journal, in which a plurality of bearing saddles are arranged at intervals and main bearings, which support main journals of a crank shaft, are respectively mounted to the plurality of bearing saddles. The bearing saddles comprise oil galleries formed in the cylinder block. Oil chambers are recessed from surfaces of the plurality of bearing saddles, to which an oil is supplied through the oil galleries, and communicate with end portions of the oil galleries to store the oil supplied from the oil galleries. The main bearings have oil holes through which the oil introduced into the oil chambers flow to the main journals. The amount of oil supplied to the main journals is determined according to an overlapped amount between the oil chambers and the oil holes.

The bearing apparatus 1 includes a crankshaft having multiple journals, main bearings supporting the crankshaft, and a bearing housing. The plurality of journals include a first journal with a lubricating oil passage and a second journal without a lubricating oil passage. The first and second journals are supported by first and second main bearings, respectively. The bearing housing is constituted by an Al-alloy upper housing and an Fe-alloy lower housing. The depth of the oil groove of the upper half bearing of the second main bearing at least in a ±45° region is equal to or smaller than a half of the depth of the oil groove of the upper half bearing of the first main bearing in the ±45° region.

An engine is described having a crankcase, a liner and a head assembly. The crankcase is split along a plane defining a two part crankcase, where fluid passages are passing through only one of the crankcase portions, so as to not require crossing the split line. A connecting rod also includes a tapered end, and the piston has a complementary carrier receiving the connecting rod.

A lubrication device of an engine includes a crankshaft supported and rotatably mounted by a main bearing and disposed at one side of a cylinder block, wherein the crankshaft includes a first main journal and a second main journal at a center in an axial direction, the first main journal being disposed between a first pin journal and a second pin journal, the second main journal being disposed between the second pin journal and a third pin journal, and two oil holes formed at the first main journal, wherein one of the oil holes is extended so as to supply oil to the first pin journal, and another oil hole is extended so as to supply oil to the second pin journal.

A crankshaft has a main journal surrounded by a main bearing defining a groove provided with oil from an oil gallery and at least one oil inlet formed in the main journal providing oil from the groove into the main journal. A first crankpin journal is connected to a first side of the main journal by way of a first web. A second crankpin journal is connected to a second side of the main journal by way of a second web. Pairs of crankpin bearings are provided around each of the first and second crankpin journals. Each crankpin bearing supports a piston rod thereon. Each of the first and second crankpin journals has a pair of oil outlets providing oil to a respective crankpin bearing. Oil passageways in the crankshaft provide the pairs of oil outlets in both the first and second crankpin journals with oil from the main journal.

A crankshaft assembly for a vehicle, a method of operating a crankshaft assembly, and a method of manufacturing a crankshaft assembly. The crankshaft assembly includes a crankshaft, a first pin bearing journal and a main journal, an oil passage having a main passage wall, the oil passage extending from the first pin bearing journal to or through the main bearing journal, a crankpin exit hole located in the main passage wall, and a blocking element positioned in the oil passage, wherein the blocking element is located in a radially outward position with respect to the crankpin exit hole.

A crankshaft and conrod assembly (100) comprising a crankshaft (110) and a conrod (150), wherein the crankshaft (110) comprises at least one main journal (111) and one crankpin journal (112), where the crankshaft (110) is provided with an oil supply structure for supplying the crankpin journal (112) with lubrication oil and the conrod (150) with an oil pressure, wherein the oil supply structure comprises: an oil supply conduit (113) provided between the main journal and the crankpin journal (112), at least a first and a second oil supply opening (114, 115) provided at the crankpin journal (112), and a connection point (116) where the oil supply conduit (113) connects to the first and second oil supply opening (114, 115).