Man Nutzfahrzeuge Ag

Man Nutzfahrzeuge Gmbh

Josef Winter

Heribert Kubis

Heribert M&ouml;ller

Heribert Moller

An auxiliary drive is provided for an internal combustion engine and includes a shaft supported in a housing by means of radial and axial bearings and a gear having the shaft non-rotatably secured thereto. The gear is driveable by a crankshaft of the internal combustion engine via intermediary gearing. The auxiliary drive also includes a power take off flange non-rotatably secured to a free end of the shaft for transferring power to a working engine such as, for example, a cement mixer. The shaft with the radial and axial bearings and the gear are integrated into the crankcase of the internal combustion engine and the gear is located directly between the radial bearings.

Auxiliary drive for internal combustion engines

A piston cooling system is provided for an internal combustion engine having a crankshaft, a plurality of pistons connected to the crankcase shaft, and a crankcase housing partitioned by a plurality of partition walls into a plurality of partitioned sections, and a pressurized lubrication fluid circuit integrated with the crankcase housing for the circulation of lubricant therethrough. The piston cooling system includes a plurality of bores each formed in a respective partition wall and communicated with the pressurized lubricant fluid circuit. The piston cooling system also includes a plurality of spray nozzles, each spray nozzle being mounted in a longitudinal bore formed in a respective partition wall. Each spray nozzle is oriented for spraying lubricant onto the underside of a piston. Each spray nozzle is formed by a lathe process.

Piston cooling system for an internal combustion engine

A crankshaft rotational support for an internal combustion engine having a crankshaft supported by rotational support elements spaced from one another along the longitudinal direction of the internal combustion engine is provided. The crankshaft rotational support includes a plurality of bearing blocks and a plurality of bearing covers. Stiffening elements extend longitudinally for interconnecting H-shaped side projections of the bearing covers to one another. The bearing blocks, the bearing covers, and the stiffening elements collectively form a unit which is cast as an integral unit during a casting process with the cast bearing covers and the cast bearing blocks being separable from one another along a break line. The side projections and the stiffening elements each have an open profile that does not comprise any fully encircled apertures in which a casting sand core may remain after casting.

Crankshaft rotational support arrangement for an internal combustion engine

A crankcase with integrated exhaust chambers and crank chambers partitioned from one another by partitions is provided and includes a plurality of cylinder liners and a plurality of bores each for receiving therein one of the cylinder liners. The crankcase also includes plenum chambers extending lengthwise on both sides of the crankcase for passage thereinto of the blow by and a plurality of bands each for partitioning off the plenum chambers relative to a respective crank chamber in cooperation with the cylinder liners. Window openings in the partition walls and transition passages associated with a respective one of the plenum chambers effect the connection of the crank chambers with the plenum chambers.

Crankcase with integrated exhaust chambers

A fluid cooled cylinder liner for mounting in a cylinder of an internal combustion engine is provided. The fluid cooled cylinder liner includes a collar and a seal element. The collar has an outer circumferential surface dimensioned with respect to the inner circumference of the cylinder so as to be in substantially fluid sealing contact therewith, an annular cooling fluid channel formed radially inwardly of the outer circumferential surface, and a radial bore extending radially from the fluid channel through the outer circumferential surface and having one end communicated with the fluid channel and an opposite end communicated with a branch bore of the crankcase of the engine. The seal element substantially seals the interface between the branch bore of the crankcase and the radial bore of the collar of the cylinder liner against the leakage of cooling fluid.

Fluid cooled cylinder liner for a cylinder of an internal combustion engine

A cylinder head sealing arrangement for reciprocating piston engines, especially internal combustion engines. An end of each cylinder liner that faces a cylinder head is provided with a raised collar that includes a centering portion. A preferably metallic combustion chamber seal in the form of a ring having a constant thickness in a starting position is guided with clearance fit. When cylinder head screws are tightened, the ring undergoes a plastic deformation of at least one end face. The ring has an inner surface that is guided relative to the centering portion only via a cylindrical guide region of the ring or the raised collar. The free space between the ring and the centering portion increases continuously proceeding from the guide region so that after plastic deformation the ring rests flat upon the cylinder liner beyond the region of a radius that defines a transition between the liner and the collar.

Cylinder head sealing arrangement for reciprocating piston engines

A cylinder head sealing element for reciprocating piston engines, especially internal combustion engines, and advantageously engines having cylinder liners, is provided. To solve the increasingly more difficult problem of sealing the cylinder head where the power density of internal combustion engines is increased, a ring-like sealing element is provided, the end faces of which plastically deform when the cylinder head screws are tightened. The inner deformations of the cylinder head resulting from pressure forces in the cylinder are compensated for by elastic yielding of the sealing ring of the combustion chamber. The dimensions of the rib of a collar of a cylinder liner, of the groove of the cylinder head, and of the end faces of the sealing ring are coordinated with one another in such a way that the plastic deformation of the sealing ring is not of such a magnitude that the cylinder liner can deform. The sealing ring can therefore be disposed directly in a centering means of the cylinder liner, thus eliminating the need for special centering devices.

Cylinder head sealing element for reciprocating piston engines

A cylinder head and combustion chamber sealing arrangement that is subdivided into a sealing element in the cylinder liner region (especially for sealing gas) and a sealing element in the cylinder block region. Both sealing elements are made of solid metal. The sealing element for gas sealing, which is disposed in the liner-collar recess, is stressed in a certain range beyond the yield limit of the material by tightening the cylinder head screws. To improve the gas sealing, on the one hand a circumferential groove is provided in the cylinder head opposite the recess in the cylinder liner collar, and on the other hand the recess itself is provided with either a circumferential groove or a circumferential rib. By this means, the liner sealing element is stressed beyond the material yield level in the specific region of its outer and inner perimeters.

Cylinder head and combustion chamber sealing arrangement for a

A reciprocating piston engine having a sealing system between the cylinder head and the cylinder liner, or the cylinder block, using a metal gasket. It is proposed to improve such a system in a manner that, while large manufacturing tolerances are permitted, i.e. tolerances on the dimensional design of the cooperating parts as well as on the cylinder head bolt torque, reliable gastight sealing of the combustion chamber is ensured at all times. This is essentially achieved in that a circumferential raised portion on the liner flange is the only part that projects beyond the top end (sealing face) of the cylinder block and is matched to the metal gasket in a manner that when the cylinder head is tightened down on the cylinder block, the cylinder head gasket is always stressed above the yield point, with the metal gasket having such a stress/strain characteristic that once the yield point is exceeded, the horizontal deformation range (i.e. where the compressive stress is constant) is as great as possible.

Reciprocating piston engine

A multi-cylinder internal combustion engine has flangeless wet cylinder liners to reduce the size of the engine. Each cylinder liner has a shoulder near its crankcase end for sealing a coolant space around the liner and for compression against a seat of an engine block with an individual cylinder head at its opposite, flangeless cylinder head end. Near the cylinder head ends, the liners have side sealing lands cooperative with sealing lands on a web of the engine block without affixation thereto for sealing the adjacent end of the coolant space, the web being thin because it does not support the cylinder head to reduce further the engine size.

Growing community of inventors

Rednitzhembach, Germany

Josef Winter