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1、Engineering Details2 - 8 FAG Code System2 Materials3 Sealing3 Steel Chemistry4 Bearing Clearance4 Standard Housing to Bearing Outer Ring Fits5 Recommended Fit and Mechanical Properties of Housing Material 5 Water Pump Bearing Mounting Recommendations 6 Lubrication6 Bearing Life and Load Ratings7 Red
2、uction of Bearing Life8 Dimensional Information9 - 49 W Bearing Family9 W-S Bearing Family15 WN Bearing Family19 WN-S Bearing Family23 WS Bearing Family25 WNS Bearing Family29 WK Bearing Family33 WKN Bearing Family39 Special Features43 Interchange Data49 - 56 NSK to FAG50 NSK/RHP to FAG52 Koyo to FA
3、G53 SKF to FAG55 New Departure to FAG56 Application Data57 - 79 Sorted by OEM PUMP BODY Casting Number 58 Sorted by Manufacturer71 Table of Contents Dimensional interchange and application data has been carefully reviewed and is accurate to the best of our knowledge. FAG Automotive does not accept l
4、iability for errors or omissions. Additions or corrections would be appreciated. PAGEPAGE 1 I FAG FAG I 2 FAG Code System Bearing part numbers are arranged in this catalogue in numerical order. The part number coding is described below. Example: Standard Size Bearings 5/8“ Shaft x 1.1811” Outer Ring
5、 Diameter Special Features, contact FAG engineering for details Variation of Basic Part Number in terms of shaft Stickout or Stepdown length Shaft Overall length in inches O.E.M Shaft Diameter (“6” would indicate respective oversize aftermarket diameter) Ball/Ball Water Pump Bearing (“WN” = Ball/Rol
6、ler) Example: King Size Bearings 3/4“ Shaft x1.5000” Outer Ring Diameter Special Features, contact FAG engineering for details Variation of Basic Part Number in terms of shaft Stickout or Stepdown length Shaft Overall Length in Inches O.E.M. Shaft Diameter (“6” would indicate respective oversize aft
7、ermarket diameter) Ball/Ball Water Pump Bearing (“WKN” = Ball/ Roller) Non-standard bearings with different shaft diameters and/or different outer ring diameters or outer ring lengths are prefixed “WS” for ball/ball units or “WNS” for ball/rollers units. W 2 3 4 6 - 1 . T 1 5 4 4W K 2 4 5 4 - 1 . T
8、1 3 1 1 W WK W WK Triple Lip Interlocking Design For severe applications Inward facing seal lip for improved grease retention Upgraded rubber material for better sealing against coolant Positive lock in outer ring, reduces possibility of seal spinning Optimized lip cross-section for torque and seali
9、ng performance Additional stainless steel slinger and third lip for increased sealing protection Spring Loaded Double Lip Interlocking Design For applications exposed to engine oil Inward facing seal lip for improved grease retention Fluoroelastomer material for better sealing against hot oil Positi
10、ve lock in outer ring, reduces possibility of seal spinning Optimized lip cross-section for torque and sealing performance Additional stainless steel garter spring to guarantee protection from oil ingress into the bearing 3 I FAG Engineering Details The function of the waterpump bearing seals is to
11、exclude contaminants, such as dust or coolant vapour, while retaining the lubricant. It is normal for a small quantity of grease to come out of the seal lip, as part of the lubrication of the seal lip interface. This quantity should not exceed 0.2g. The seal performance is determined by the material
12、 properties and the lip design, as detailed below. Conventional Single Lip Snap Type Design For normal automotive applications Vulcanized elastomer sealing element Ease of assembly Economical Standard Double Lip Interlocking Design For demanding applications Inward facing seal lip for improved greas
13、e retention Upgraded rubber material for better sealing against coolant Positive lock in outer ring, reduces possibility of seal spinning Optimized lip cross-section for torque and sealing performance In a water pump bearing, very high local stresses can occur in the rolling element raceways. They a
14、re generally in the range of 1050 MPa to 4200 MPa. Interference fits further increase the stresses. Under standard operating conditions, wear of the sliding and rolling surfaces must be taken into account. Cantilever loads on the shaft necessitate excellent bending strength. As such our outer ring,
15、balls, and rollers are made of through hardened SAE 52100 or its European equivalent DIN 100Cr6. The Shaft is made of SAE 1070 which is induction hardened in order to maintain a soft, flexible core. All rolling surfaces are hardened to a range of HRC 58 to 64. Materials Sealing Both steels are melte
16、d in basic open- hearth or electric furnaces. The introduction of vacuum degassing for SAE 52100 improves the inclusion cleanliness of the product. SAE 1070 is processed by means of bloom continuous casting or ingot casting. Both methods are COMPOSITION % TYPE CSiMnPSCr DIN 100Cr6 or0.90 - 1.100.15
17、- 0.35 0.25 - 0.450.025 Max0.015 Max1.30 - 1.60 SAE 52100 SAE 10700.65 - 0.750.15 - 0.30 0.60 - 0.900.025 Max0.020 Max.20 Max Operating clearance affects the bearing life. High clearance results in a loose assembly, and low operating clearance results in bearing pre-load. The predicted effect on lif
18、e is shown in the chart at right. As can be seen, the roller raceway is much more sensitive to bearing pre-load when a moderate pre-load such as 15 microns is present. Operating clearance depends on the bearing manufactured clearance, temperature of operation, housing material and FAG I 4 Steel Chem
19、istry Bearing Clearance accurately controlled maintaining inclusion levels more stringent than ASTMA295 for bearing steel. press fit. See standard housing to bearing outer ring fit chart on the next page. 5 I FAG Engineering Details Standard Housing to Bearing Outer Ring Fits THERMAL MATERIAL ELASTI
20、C MODULUSYIELD STRESSEXPANSION RECOMMENDED FIT (mm) (MPa)(MPa)COEFFICIENT /mmC BORE DIAMETER 30.000mm38.100mm47.625mm55.000 mm Steel207,00030011 29.97238.07247.600 29.94638.04647.574 Aluminum70,00018022 29.94938.02947.55454.923 29.92438.00347.52854.898 Cast Iron G30114,00027511 29.96738.06747.58754.
21、946 29.94738.04747.56254.919 Cast Iron G55140,00027511 29.96738.06747.58754.946 29.94738.04747.56254.919 Recommended Fit and Mechanical Properties of Housing Material Material properties may vary significantly for some alloys. To determine the correct fit, the actual properties of the housing materi
22、al in question should be considered. FAG I 6 The highest life values are obtained with hydrodynamic state of lubrication, that is where no metal to metal contact exists between the rolling elements and their respective raceways. For this, high cleanliness is also a necessity. With the increase of op
23、erating temperature thinner lubricating films result causing metal to metal contact. This causes a decrease in bearing life. FAG has developed lubricants which can be selected to suit specific application needs. Our standard NLG1 3 lubricant has a temperature capability better than 120C (255F). Spec
24、ial customer requirements will require the input of FAG Engineering. Lubrication When mounting the bearing into the housing, care must be taken to prevent the transmitting of forces through the ball complement. In order to avert this, a sleeve should be used that contacts the outer ring face only. A
25、 mechanical press should be used. The hub, impeller and mechanical seal bores must be aligned with the shaft axis during their mounting. Again a press should be used and the opposite shaft end must be Water Pump Bearing Mounting Recommendations supported to prevent transmission of forces through the
26、 ball complement. Bearing Housing Fit The function of the outer ring interference fit is to retain the bearing in the housing over the intended service temperature range. It also must provide adequate bearing support without inducing ovality into the raceways. If the interference fit is too light, t
27、he bearing could walk out of the housing. If the fit is too heavy, pre-load of the bearing may occur. Housing Requirements Bore circularity 0.010mm. Bore taper .007 mm per 25 mm bore length. Smoothing During press in, material from the housing bore is removed resulting in less holding force. In cold
28、 conditions, material removal increases. This depends on the housing material and the housing bore surface finish. BEARING TYPE COMPONENTS BALLROLLER 5/8“ Standard Ball/Ball6.5 (1470) 5/8“ Standard Ball/Roller6.5 (1470)15.8 (3550) 3/4“ Standard Ball/Ball9.7 (2180) 3/4“ Standard Ball/Roller9.7 (2180)
29、26.3 (5900) 7 I FAG Engineering Details L10is the lifetime expressed in millions of revolutions. It is reached or exceeded by at least 90% of a large group of identical bearings. P is the life exponent. For a ball bearing it is 3, and for a roller bearing, 10/3. For a constant speed, the life in hou
30、rs is calculated: L10= Lh= L10106 (hours) n60 where n = speed in rpm Improvements in bearing materials and bearing greases can add further adjustment factors to the bearing life. FAG Engineering should be contacted in order to define the factors applicable for each application. Static Load Rating (C
31、o) This load causes a total permanent deformation of 0.0001% of the rolling element diameter at the most heavily loaded element/raceway contact. For the usual curvature ratios, this value corresponds to a contact pressure of approximately 4200 MPa. Rating Lifetime The rating life is determined by th
32、e formula: L10= (C)P(106revolutions) P P is the equivalent dynamic load. It is a combination of radial and axial loads which can act on the bearing simultaneously. P = X .Fr+ Y .Fa where: Fr= Radial Load Fa= Axial load X = Radial Factor Y = Thrust Factor C is the dynamic load rating. It is indicated
33、 in the included chart per the latest ABMA regulations. Bearing Life Basic Dynamic Load Rating C kN (lbF) FAG I 8 Engineering Details Reduction of Water Pump Bearing Lifetime Due to Improper Assembly Lack of attention to proper installation of pulleys, fans, fan spacers or viscous clutches will caus
34、e increased bearing loading during operation. Typically, the water pump belt forces and weights of rotating components on the bearing shafts will load the outer ring raceways over only one-half of its circumference. This is called a point loaded condition. Because of rotation with respect to the loa
35、ds, the shaft raceways are loaded over their full circumference or, circumferentially loaded. If the assembly procedure or mounted components contain or induce eccentricities at the mating surfaces, imbalance loads will be generated. If angularity occurs, gyroscopic moments are created due to the ti
36、lted, wobbling motion of the misaligned components during rotation. Angularity may also contribute to the eccentric imbalance loads. All eccentric and gyroscopic load components are non-stationary in direction and rotate with the shaft. This situation, if severe, will reverse the raceway loading pat
37、terns to that of point loaded shaft raceways and 360 degree circumferentially loaded outer ring raceways. The magnitudes of these loads increases with the square of the rotational speed. Other conditions generated under these circumstances are roller edge stressing and misaligned ball row tracking.
38、This acts to elevate cage and lubricant stressing and increase bearing operating temperatures. As well, the L10bearing fatigue life becomes shorter due to the increased equivalent load on each row. Taken to extremes, imbalance and gyroscopic loads may become so high reaching the strength limitations
39、 of the shaft material. The dynamic stress reversals may initiate tiny micro-cracks in the hardened case layer. If operation such as this continues, the cracks will propagate across the entire shaft cross section and cause the shaft to fracture, often with catastrophic results. As an assist to deter
40、mining the severity of these effects, FAG Applications Engineering can provide computer calculation services to assess the extent of imbalance and gyroscopic loads and their influence on bearing L10life. W 9 I FAG Bearing Family The W family consists of a ball / ball internal design. Standard design
41、 offers a 5/8“ main shaft diameter, 1.1811“ outer ring diameter, and a 1.530“ outer ring length. This bearing is typically used in automotive water pump applications. Some W bearings are available with special features. FAG I 10 Bearing NumberABCDE W22892.8900.1581.2030.6267 W23253.2500.1601.5610.62
42、67 W2355-33.5520.6701.3530.6267 W23663.6610.7281.4040.6267 W23713.7150.6891.4960.6267 W2375-33.7580.5631.6660.62670.189 W23853.8580.6701.6590.6267 W2401-34.0160.6711.8160.6267 W2406-14.0620.9241.6090.62670.189 W2415-14.1500.8011.8190.62670.189 W2417-24.1720.8151.8280.62670.189 W24314.3120.5782.2050.
43、6267 W24344.3460.8431.9740.62670.189 W2434-14.3460.8431.9740.62670.189 W24354.3590.7662.0620.6267 W24394.3900.9391.9220.6267 W2440-44.4001.1511.7180.62670.189 W2441-14.4091.0621.8150.6267 W24464.4691.0811.8590.62670.189 W24544.5470.8062.2120.6267 W24564.5611.1001.9330.62670.189 W2456-14.5671.0701.96
44、90.6267 W24684.6871.4711.6870.62670.189 W2468-14.6881.4691.6900.62670.189 W24724.7201.4401.7510.62670.189 11 I FAG W Series Dimensions Bearing NumberABCDE W24754.7501.5011.7180.62670.189 W2475-14.7501.3411.8800.62670.189 W24764.7601.1622.0690.62670.189 W2476-24.7601.1622.0690.6267 W24814.8101.3361.9
45、450.62670.189 W2481-14.8121.1252.1560.62670.250 W24854.8500.7662.5550.6267 W2486-24.8691.2522.0880.62670.189 W25035.0311.0162.4840.62670.189 W2503-65.0311.7501.7500.62670.189 W25075.0781.2522.2970.62670.189 W25325.3262.0021.7950.62670.189 W25375.3701.5402.3010.62670.189 W25475.4720.9103.0340.62670.1
46、89 W2548-15.4851.3802.5760.62670.189 W25625.6251.5782.5160.62670.250 W2562-15.6251.5792.5150.62670.189 W25755.7552.5151.7110.62670.189 W2575-25.7502.4301.7890.62670.189 W26376.3752.3002.5460.62670.189 W33993.9960.6891.7780.6275 W3481-54.8121.5851.6990.6275 W3481-64.8121.5851.6990.62750.189 W3520-25.
47、2021.5822.0890.62750.189 W3520-35.2021.5822.0920.6275 FAG I 12 Bearing NumberABCDE W3522-15.2221.1742.5190.6275 W36076.0721.1723.3710.6275 W3607-16.0721.1743.3690.62750.189 W63643.6400.9901.1200.6290 W63663.6610.7281.4040.6290 W6375-33.7580.5621.6660.62900.189 W63853.8580.6701.6570.6290 W6401-34.016
48、0.6691.8170.6290 W6406-14.0620.9241.6090.62900.189 W6415-14.1500.8021.8190.62900.189 W6428-14.2811.0781.6720.62900.189 W6433-24.3301.1401.6590.62900.189 W64344.3460.8431.9700.62900.189 W64394.3910.9401.9220.62900.189 W6440-44.4001.1531.7180.62900.189 W64454.4531.2521.6720.62900.189 W64464.4691.0801.
49、8590.6290 W6450-24.5001.2601.7090.62900.360 W64544.5470.8092.2090.6290 W64564.5611.1001.9320.62900.189 W64684.6871.4721.6870.62900.189 W6468-14.6881.4691.6900.6290 W64704.7031.2831.8910.6290 W64764.7601.1622.0690.62900.189 W6478-14.7881.2372.0220.62900.189 13 I FAG W Series Dimensions Bearing NumberABCDE W64814.8101.3341.9450.62900.189 W6481-14.8121.1252.1560.62900.189 W64844.8441.4541.8620.62900.189 W6486-24.8691.2502.0900.62900.189 W65035.0311.0182.4840.62900.189 W65075.0781.2502.2970.62900.189 W65275.2701.6792.0600.62900.189 W6534-15.3442.
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