Needle roller and cage assemblies for crank pins and piston pins

Needle roller and cage assemblies for crank pins and piston pins Product overview Special designs Ordering example and ordering designation Features Design and safety guidelines Dimension tables Schaeffler Technologies

Product overview Needle roller and cage assemblies for crank pins and piston pins KZK Schaeffler Technologies

Needle roller and cage assemblies for crank pins and piston pins Features Needle roller and cage assemblies for connecting rod bearing arrangements are used in the crank mechanisms of 2 and 4 stroke engines as well as in compressors for supporting crank pins and piston pins. They consist of cages equipped with needle rollers, support high centrifugal and acceleration forces and are suitable for high speeds. They require very little radial space since the radial section height only corresponds to the diameter of the needle rollers. They give bearing arrangements with high runout accuracy which...

Needle roller and cage assemblies for crank pins and piston pins Figure 1 Crank end guidance – lateral guidance of the connecting rod Piston end guidance Figure 2 Piston end guidance – lateral guidance of the connecting rod The connecting rod and needle roller and cage assembly KZK are guided axially between the crank webs, Figure 1. The connecting rod eye at the crank end must have lubrication pockets and slots to allow the supply of lubricant. The KBK is guided axially between the piston boss abutment surfaces. Free lateral movement of the connecting rod between the piston bosses. Depending...

Design of adjacent parts Proven materials for adjacent parts The bores and pins for the needle roller and cage assemblies must be produced as rolling bearing raceways. A roughness Rz1 (Ra0,2) must be ensured. The rolling bearing raceways, thrust surfaces and thrust washers must be as follows: ■ case hardened to at least 0,5 mm deep; a surface hardness of at least 700 HV must be ensured. ■ The lateral thrust surfaces should be precision machined (Ra2 recommended) and wear resistant; thrust washers should be fitted if necessary. For lubrication of the needle roller and cage assemblies, holes or...

Needle roller and cage assemblies for crank pins and piston pins Accuracy Permissible geometrical tolerances for crank pin bearing arrangements The geometrical tolerances of the raceways must be in accordance with the tables and Figure 3 and Figure 4. Nominal dimension Figure 3 Geometrical tolerances for crank pin bearing arrangements Permissible geometrical tolerances for piston pin bearing arrangements Nominal dimension Figure 4 Geometrical tolerances for piston pin bearing arrangements Schaeffler Technologies

Radial internal clearance For crank pin bearing arrangements For piston pin bearing arrangements Schaeffler Technologies The radial internal clearance can be determined by means of the needle roller sort, see table Sort plan for crank pin and piston pin bearing arrangements, page 8. For simplification, the mean values of the needle roller sorts can be used. Example of determination of the radial internal clearance using the mean value of the needle roller sort: ■ Needle roller sort 0 –2, mean value –1. The radial internal clearance is dependent on the speed, rigidity and accuracy of the crankshaft...

Needle roller and cage assemblies for crank pins and piston pins Sort plan for crank pin bearing arrangements Sort plan for crank pin bearing arrangements Conditions: ■ Bore tolerance G6 for 18 mm to 30 mm in three groups ■ Pin tolerance h5 for 14 mm to 18 mm in three groups ■ Needle roller sort 0 –2 to –5 –7 ■ Radial internal clearance 17 ␮m to 30 ␮m. Bore deviations +7 +11 Crank pin deviation Needle roller sort Needle roller sort Radial internal clearance Needle roller sort Radial internal clearance Sort plan for piston pin bearing arrangements Radial internal clearance Sort plan for piston...

Special designs Ordering example and ordering designation Schaeffler Technologies Needle roller and cage assemblies KZK are available by agreement in the following designs: ■ split cage, suffix D ■ copper plated cage, suffix CU ■ silver plated cage, suffix AG ■ for high performance machines. Needle roller and cage assembly KZK for: ■ crank pin 16 mm ■ connecting rod bore 22 mm ■ width 12 mm ■ needle roller sorts (sort pair coded blue) –2 –4 and –3 –5 ■ copper plated cage. Ordering designation: ■ KZK16ϫ22ϫ12 SORT–2–4/–3–5–CU

Needle roller and cage assemblies for crank pins Dimension table · Dimensions in mm Designation1) 2) Basic load ratings stat. C0r Fatigue limit load The needle roller and cage assemblies are available by agreement only. Production is dependent on economically viable quantities. The designation describes the dimensions only. For a precise ordering designation, please contact us. Schaeffler Technologies

Needle roller and cage assemblies for piston pins Dimension table · Dimensions in mm Designation1)2) Basic load ratings Fatigue limit load The needle roller and cage assemblies are available by agreement only. Production is dependent on economically viable quantities. The designation describes the dimensions only. For a precise ordering designation, please contact us. Schaeffler Technologies

Needle roller and cage assemblies for crank pins and piston pins Appendix Calculation of rolling bearings in crank machines Our calculation method can be used to calculate the basic rating life L10 of the bearings (needle roller and cage assemblies for crank pins and piston pins, main bearings) in the crank mechanism of internal combustion engines on the basis of DIN ISO 281. In comparison with the standardised calculation to DIN ISO 281, it additionally takes into consideration the influence of internal load distribution in the bearing on the rating life. The calculation method takes account...

Datasheet · Needle roller and cage assemblies for crank pins and piston pins Customer data Enquiry data Proposal deadline Delivery date Annual volume Required rating life Engine data Engine type Cylinder bore Engine power Mass of longitudinally guided parts Mass of rotating parts Design data for connecting rod Connecting rod length Centre of gravity of connecting rod LS1) _________________ mm Design data for crankshaft main bearing arrangement2) Crank-conrod offset distance Position of brg. C xC1) _________________ mm Oscillating mass compensation Bearings for calculation Bearing A1) See functional...