Thrust Needle Roller Bearings

Transcript

1 Thrust needle roller bearings offer high reliability for a wide range of applications, from automobile drive trains to industrial machinery, featuring compact sizes, high load capacity, and high limiting speed.

2 A wide selection of high-quality series and cage-roller assemblies available for a variety of applications. 1. Compact Design 2. Wear resistant and highly rigid 3. Economical 4. Easy handling Offer same cross-section height as conventional urface-hardened cage provides both wear imple design suited for mass production makes Unitization of needle roller assemblies (integrated- thrust washers. resistance and high rigidity. these bearings highly economical. type and cage-roller assemblies) facilitates the positioning and mounting of bearings in spacelimited areas. 1 2

3 Thrust needle roller bearings are a type of needle roller bearing with a cage. They are compact and offer large load capacity and high limiting speed. The two-piece cage, consisting of precision-pressed steel, guides the rollers accurately (see Figs. 1 and 2). The surface-hardened cage offers superior wear resistance and strength. Our integrated-type bearings with raceway washer are designed for applications where a low profile is desired and can easily replace conventional thrust washers. Different thicknesses of various types of raceway washers are available for these bearings, which allow selection of the appropriate thickness suited to bearing mounting conditions (see Fig. 3). An integrated (unitized) bearing, which consists of a cage, rollers, and raceway, is also available (see Fig. 4). These bearings are widely used in automobile drive trains, compressors, hydraulic pumps, machine tools, and industrial machinery. 2. pecification Number The composition of bearing numbers is as follows: Example (Metric): FNTA Example (Inch): FH Outside diameter (mm) Type Code Bore diameter (mm) Type Code Unique number For inch bearings, each dimension is expressed with whole numbers in units of 1/16 of an inch. Integrated bearings have their own unique bearing number configuration. Fig. 1 Fig Accuracy tandards The metric FNTA type conforms to IO standards. The fitting tolerance of the inner dimension of the cage is class E11, and the outside diameter is class c12 (see Table 3). The inch NTA type and dimension tolerance for thrust raceways of both systems of measurement are provided in the dimension table. Roller precision is equivalent to grade 3 of IO For details on precision of integrated bearings and raceways with flange, contact NK. Fig. 3 FG K eries outer flange FG F eries inner flange Fig. 4 Integrated bearings FH Raceway washer 2 1. Types everal types of thrust bearings are shown in Table 1. For inch bearings, the dimension number is expressed in integers in units of 1/16. Raceway washers are available for use when the raceway surface cannot be hardened by heat treatment and ground to the proper finish. Types of raceway washers used for cage and roller assemblies in thrust needle roller bearings are shown in Table 2. JK type JF type Fig. 5 hape of Raceway Washers with Flange FNTA ZNTA NTA FA Code FG (K eries) FG (F eries) FH Table 1 Bearing hape Table 2 Raceway Washers for hape symbol FTRA, FTRB, FTRC, FTRD, FTRE TRA, TRB, TRC, TRD, TRE Description Cage and roller assemblies for thrust needle roller bearings Integrated type with raceway washer Raceway washer: JK type (with outer flange) Integrated type with raceway washer Raceway washer: JF type (with inner flange) Integrated type with raceway washer Raceway washer: JK type + JF type Description Raceway washers without flange Table 3 Dimension for Bore Diameter and Outside Diameter Classification of nominal dimensions of Inner bore tolerance Outer bore tolerance outside diameter and bore diameter E11 c12 (mm) (µm) (µm) over incl

4 4. Applications for Optimal Performance Mounting When using a bearing with cage and roller assembly, a separate raceway washer is not needed if the gear side is used as a raceway. This saves space and allows the bearing to be more compact. With a housing that will not allow the gear side to be used as a raceway, using an integrated bearing facilitates handling and mounting (see Fig. 6). In general, the accuracy, surface roughness, and hardness of the raceway components should satisfy the specifications shown in Table 4. When a cage and roller assembly cannot be used alone, a thrust raceway washer should be selected according to the washer support face and the volume of the load. The thrust raceway washer should be set to prevent sliding between the contact surfaces. When the area supporting the raceway washer is sufficiently large and rigid, a thin raceway washer, such as FTRA or TRA type, can be used. Even if washers are warped, an axial load of more than approximately 196 N (20 kgf) will flatten them. When the support face of the shaft or housing is small, thick-wall raceway washers (FTRE or TRD type), or one of the other thicker types should be used (see Fig. 7). When using raceway washers, the accuracy, shape, and size of the support face affect performance of the bearing. For squareness of the raceway washer support face, the values given in Table 4 must be applied and the support face must be sufficiently large. Please contact NK regarding shape and accuracy. Bearing guide Thrust needle roller bearings often use the bore guiding method, as relative speed at the guide face may be slow. If used for particularly high speeds, bore guiding is required. If design requires an outer guide, it is necessary to harden the outer guide surface to prevent wear of the housing guide. The various FG types for integrated bearings use the raceway flange surface of the guide. The FH type can use either bore and outside surface as a guide surface, but it is important to keep one side free. Fig. 8 shows the guide methods for the various types. FG K eries FH FH FG F eries Bore guide Outside guide Bore guide Fig. 8 Fig. 6 Fig. 7 Fitting Table 5 shows the recommended fittings for cages, roller assemblies, and raceways for thrust needle bearings. For each type of integrated bearing, the table gives recommended mounting dimensions. Table 5 Recommended Fittings for Units: mm Classification Cage and roller assembly for thrust needle roller bearing Raceway washer for thrust needle roller bearing Type FNTA NTA FTRA~FTRE TRA~TRF Cage or raceway guide haft Housing Bore Outside Bore h D c + over 1.0 H10 D c + over 1.0 Outside Bore H10 D c + over 1.0 Outside Bore Outside class or dimension tolerance h H10 D c + over 1.0 H10 quareness A quareness B Roughness, R a Hardness Table 4 pecifications of Thrust Bearing Raceway urface Max. 0.5/1000 (mm/mm) Max. 1.0/1000 (mm/mm) 0.4 (µm) HRC58~64 (HRC60~64 is advisable.) Mounting Observe the following precautions when mounting: (1) Mount so the shape of the cage is not distorted. (2) Remove contamination from the raceway and support surface. (3) Check the squareness of the raceway and support face. (4) If using a raceway, check the guide type. (5) Make sure that clearance of the guide is not too large. Hardening layer depth t (0.08~0.10) D w t: Effective hardening layer depth (mm) (depth to HV550) D w : Roller diameter (mm) 5 6

5 FH ➀ T D D i d D e FH Bore guide Outside guide Basic Load Ratings (N) d D D e D i T Roller Diameters C a C 0a FH ➀ FH501802A ➀ FH501802B ➀ FH502006A ➀ FH ➀ FH502204B ➀ FH ➀ FH502306A ➀ FH ➀ FH502702A ➀ FH ➀ FH502807B ➀ FH502807B ➀ FH502807B ➀ FH ➀ FH503003B ➀ FH503003C ➀ FH503006E ➀ FH ➀ FH ➀ FH ➀ FH503211A ➀ FH503301C ➀ FH503306D ➀ FH503310B ➀ FH ➀ FH503405C ➀ FH ➀ Basic Load Ratings (N) d D D e D i T Roller Diameters C a C 0a FH ➀ FH ➀ FH ➀ FH ➀ FH ➀ FH ➀ FH503810C ➀ FH503810D ➀ FH503901A ➀ FH504003B ➀ FH504009B ➀ FH ➀ FH504114A ➀ FH504308A ➀ FH ➀ FH504502A ➀ FH504507A ➀ FH504509A ➀ FH ➀ FH504801B ➀ FH ➀ FH ➀ FH505603A ➀ FH ➀ FH ➀ FH ➀ FH508801A ➀ 7 8

6 FG (K eries) ➁ FG (F eries) ➂ T 1 T 1 D D 1 D c1 D i D e d 1 d D c D i D e K eries Mounting diagram F eries Mounting diagram Basic Load Ratings (N) d, D 1 D c1 D, d 1 D c T 1 D i D Roller e Diameters C a C 0a FG ➂ FG501803A ➁ FG501804A ➂ FG ➁ FG502009B ➂ FG ➂ FG ➂ FG502305A ➂ FG ➂ FG502407A ➁ FG ➁ FG502605C ➁ FG ➁ FG ➂ FG ➂ FG502705B ➂ FG ➂ FG ➂ FG ➁ FG ➂ FG ➁ FG ➂ FG ➁ FG ➁ FG ➁ Basic Load Ratings (N) d, D 1 D c1 D, d 1 D c T 1 D i D Roller e Diameters C a C 0a FG ➁ FG ➂ FG ➁ FG ➂ FG ➂ FG503301A ➂ FG ➂ FG ➁ FG503503A ➁ FG ➂ FG ➁ FG ➁ FG ➁ FG503708A ➁ FG ➂ FG503806A ➁ FG503806C ➁ FG503814E ➂ FG ➂ FG ➁ FG ➁ FG ➁ FG ➁ FG ➁ FG ➁ 9 10

7 FG (K eries) ➁ FG (F eries) ➂ T 1 T 1 D D 1 D c1 D i D e d 1 d D c D i D e K eries Mounting diagram F eries Mounting diagram Basic Load Ratings (N) d, D 1 D c1 D, d 1 D c T 1 D i D Roller e Diameters C a C 0a FG ➂ FG ➁ FG ➂ FG ➂ FG504403A ➁ FG504403B ➁ FG ➁ FG504406A ➁ FG ➁ FG ➁ FG504604A ➂ FG ➂ FG ➁ FG ➂ FG ➂ FG ➂ FG ➂ FG ➂ FG ➂ FG ➂ FG ➁ FG ➂ FG ➁ FG505007A ➁ FG ➂ Basic Load Ratings (N) d, D 1 D c1 D, d 1 D c T 1 D i D Roller e Diameters C a C 0a FG ➁ FG505009A ➁ FG ➂ FG ➁ FG ➁ FG ➁ FG ➁ FG505507A ➁ FG ➁ FG ➂ FG505603A ➁ FG ➂ FG ➁ FG ➂ FG ➁ FG ➁ FG ➁ FG ➁ FG ➁ FG ➁ FG506802A ➁ FG506905A ➁ FG ➁ FG ➂ FG ➁ 11 12

8 Cage and Roller Assemblies ➃ D w ➄ D w D c D e D c1 D i D c D e D c1 D i Roller Contact Basic Load Ratings (N) urfaces D c1 high low D c high low D w C a C 0a D i D e NTA ➄ NTA ➄ FNTA ➄ FNTA ➄ NTA ➄ FNTA ➄ FA ➃ FNTA ➄ FNTA ➄ FNTA ➄ FA ➃ ZNTA-1737Z ➄ FNTA ➄ FA ➃ NTA ➄ FA ➄ FNTA ➄ FA ➃ FA ➃ FA ➃ FA ➃ NTA ➄ Roller Contact Basic Load Ratings (N) urfaces D c1 high low D c high low D w C a C 0a D i D e FA ➃ FA ➃ FA ➃ FA ➄ FA ➃ FAH ➃ FA ➄ FA ➃ FA ➃ FNTA ➄ FA502527D ➄ FA ➄ FA ➃ NTA ➄ FA ➄ FA ➃ FA ➃ FA ➃ FA46659-R ➄ FA ➃ FNTA ➄ FA ➄ 13 14

9 Cage and Roller Assemblies ➃ D w ➄ D w D c D e D c1 D i D c D e D c1 D i Roller Contact Basic Load Ratings (N) urfaces D c1 high low D c high low D w C a C 0a D i D e FA ➃ FA ➃ FA ➃ FA ➃ FA ➄ FA ➃ FA ➄ NTA ➄ FNTA ➄ FA ➃ FA ➃ FA ➃ NTA ➄ FA ➃ FNTA ➄ FA504020A ➃ FA ➄ FA504202A ➄ FA504202B ➄ FA ➃ FA504309A ➃ Roller Contact Basic Load Ratings (N) urfaces D c1 high low D c high low D w C a C 0a D i D e NTA ➄ FNTA ➄ FA ➄ FA ➃ FNTA ➄ NTA ➄ NTA ➄ FNTA ➄ FA505507C ➃ NTA ➄ FNTA ➄ NTA ➄ FA ➃ FNTA ➄ FNTA ➄ FNTA ➄ NTA ➄ FNTA ➄ NTA ➄ FNTA ➄ FNTA ➄ 15 16

10 Thrust raceway washers FTRA ( = 1.0) FTRB ( = 1.5) FTRC ( = 2.0) FTRD ( = 2.5) FTRE ( = 3.0) ➅ Thrust raceway washers TRA ( = 0.81) TRB ( = 1.6) TRC ( = 2.4) TRD ( = 3.2) ➆ D p 0.75 D p D p 0.75 D p FTR TR D p1 D high low p high low TRA ➆ TRC ➆ TRA ➆ TRB ➆ TRC ➆ FTRA FTRB ➅ FTRA ➅ TRC ➆ FTRB ➅ FTRA ➅ FTRC ➅ FTRE ➅ TRA ➆ FTRA ➅ FTRA ➅ A A A A A A A A A D p1 D high low p high low A FTRA ➅ FTRB ➅ FTRC ➅ TRC ➆ A FTRA ➅ FTRC ➅ FTRE ➅ B A B A TRA ➆ FTRA ➅ 17 18

11 Thrust raceway washers FTRA ( = 1.0) FTRB ( = 1.5) FTRC ( = 2.0) FTRD ( = 2.5) FTRE ( = 3.0) ➅ Thrust raceway washers TRA ( = 0.81) TRB ( = 1.6) TRC ( = 2.4) TRD ( = 3.2) ➆ D p 0.75 D p D p 0.75 D p FTR TR D p1 D high low p high low FTRB ➅ FTRC ➅ FTRE ➅ A A TRA ➆ FTRA ➅ FTRB ➅ FTRC ➅ FTRE ➅ TRA ➆ D p1 D p high low high low TRB ➆ FTRA ➅ FTRB ➅ FTRC ➅ FTRD ➅ FTRE ➅ TRA ➆

12 Thrust raceway washers FTRA ( = 1.0) FTRB ( = 1.5) FTRC ( = 2.0) FTRD ( = 2.5) FTRE ( = 3.0) ➅ Thrust raceway washers TRA ( = 0.81) TRB ( = 1.6) TRC ( = 2.4) TRD ( = 3.2) ➆ D p 0.75 D p D p 0.75 D p FTR TR D p1 D p high low high low FTRA ➅ FTRC ➅ FTRE ➅ TRC ➆ FTRA ➅ FTRA-4565A ➅ FTRC ➅ FTRE ➅ FTRA ➅ FTRC ➅ TRC-3244B ➆ TRD ➆ FTRA ➅ FTRC ➅ FTRE ➅ A D p1 D high low p high low TRC ➆ TRD ➆ FTRB ➅ FTRC ➅ FTRE ➅ TRC ➆ TRD ➆ FTRC ➅ TRC ➆ FTRA ➅ FTRA ➅ FTRC ➅ FTRE ➅ FTRC ➅ FTRE ➅ TRD ➆ FTRA ➅ TRD ➆ FTRC ➅ FTRE ➅ FTRA ➅ 21 22