Chapter 2 - Page 10
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Crank drive and valve drive
The crank drive comprises crankshaft, con rod, piston, rotary vibration damper and the flywheel.
The drop-forged crankshaft 1 is hung in multilayer bearings in the crankcase 7. Every bearing cover is
secured by four studs. Multilayer bearings offer greater lubrication security and emergency running proper-
ties. The shaft and crank journals and the contact surfaces of the axial bearings are inductively hardened.
The counterweights 9 screwed to the crank webs serve to dissipate the internal mass effect and relieve the
crankshaft bearing. The rotary vibration damper and the flywheel ensure smooth running of the engine with
their structure calculated exactly for every application.
The double T-shank con rods 2 are divided at an angle. This allows removal of the piston with con rod up
through the cylinder liner 3. The con rods run on the crankshaft in sputter bearings. A liner is pressed into the
upper con rod eye in which the piston bolt 4 is mounted on a floating bearing.
The pistons 6 are cast from a lightweight metal. The piston rings 5 (trapeze ring, minute ring and a narrow
land drain oil control ring) are in cast steel beams. The pistons are supplied with cooling lube oil through a
spray nozzle 8. The lube oil flows through the cooling channels of the piston base where it emits heat.
The cylinder liners 3 are made by a spin casting technique. Special emphasis is placed on honing in the fur-
ther processing. The cross grinding angle created during honing is asymmetrical is response to the demand
for low oil consumption and optimum run-in times. The cylinder liners touch the crankcase and are guided in
a collar at the top and bottom.
The use of wet cylinder liners enables fast and low cost exchange of a cylinder unit.
Summary of Contents for TBD 616 OEM
Page 1: ...Operating Instructions TBD 616 OEM Operating Instructions TBD 616 OEM ...
Page 2: ......
Page 138: ...Chapter 8 Page 6 300200137 en 00 fm 0103 Technische Angaben TBD 616 OEM ...
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