Universal Joint - Renold Plc

1 Universal Joint High Shock and Overload Capacity Long Life Heat Treated Alloy Steel Components Minimal Lubrication Required Virtually Backlash- Free Quick Delivery Superior Technology Table of Contents Page Introduction ..2. Advantages and Features;. Typical Construction and Speed Limits .. 4-5. Selection Procedure .. 6-7. Engineering Data .. 8-17. Flange Adaptors .. 18-19. Design Variations and Custom Applications .. 20-21. Kinematics and Motion Characteristics .. 22-23. Bore Tolerances and Weights .. 24-25. Application Data for Selection and 26-27. The Renold Inc. Universal Joint Renold Inc., a leader in power transmission When compared to other high misalignment equipment for over 90 years, offers a complete couplings, Universal joints operate with negligible line of Universal joints. backlash or radial clearance. The difference can be The Universal Joint is considered to be one of the significant on applications where backlash is critical.

2 Oldest of all flexible couplings. It is commonly known Renold Universal Joint yokes are precisely for its use on automobiles and trucks. A Universal engineered using the latest design technologies. Joint in its simplest form consists of two shaft yokes They are manufactured as a one-piece, closed at right angles to each other and a four point cross bearing eye design, assuring the highest degree of which connects the yokes. The cross rides inside strength and minimum distortion under load. the bearing cap assemblies, which are pressed into The cross design is even more important and the yoke eyes. has received careful consideration through Industrial applications operate continuously and with extensive computer analysis to match the strength high torque loads. This demands maximum strength characteristics of the yoke. and long life of the Universal Joint components.

3 The Yokes and crosses are both precision machined modern Universal Joint has become much more from heat treated alloy steels. They are assembled complex than its simple ancestor. The Universal with minimum clearance bearing units using the joints manufactured by Renold are made for lastest in roller bearing technology including demanding industrial applications. crowned rollers that minimize friction and provide Universal joints have several unique features that long life. make them ideal for a variety of applications. Most The Universal Joint can be used as a single Joint or significant is the ability of the Universal Joint to it can be used in pairs. When used as a single Joint , operate at high misalignment angles. Operating only angular misalignment is accommodated. angles up to 15 degrees are not uncommon. Since nearly every installation requires the coupling Another feature of the Universal Joint is the bearing to also accommodate offset misalignment, Universal and seal design that resists lubrication loss and joints should be used in pairs.

4 Using Universal contamination. This makes Renold Universal joints in pairs also corrects for non-uniform angular Joints suitable for applications where severe velocity caused by the rotational characteristics of a atmospheric conditions would put other couplings single Joint . at a distinct disadvantage. 2 2. WE8491 APT 2 4/2/09 9:16 AM WE8. Advantages and Design: Typical Applications Advantages and Features Typical Applications Domestic manufacture Following is a partial list of applications for the Renold Universal Joint . High torque capacity Long bearing life Agitators Packaging High operating angle capability Balancing Machines Paper Mills Blowers and Fans Calender Drives One piece yoke and bearing housing construction Sizing and Press Eliminates unnecessary bolted connections and serrations in yokes Compressors Rolls Heat treated alloy steel components Conveyors Couch Rolls Ideal loading across entire bearing length due to balanced deflection Cooling Tower Fans Process Pumps between yokes and cross Cranes and Hoists Plastic Manufacturing Replaceable inner bearing race on size RA440 and larger Crushers Melt Pumps significantly reducing cross-maintenance expenses Farming Equipment Printing Presses Available in four basic types Generators Pumps Technical support and engineering services available Irrigation Glass Manufacturing Lift Extensive repair facility Lumber Mills Sewage

5 Special sizes and designs available upon request Marine Propulsion Railway Drives Large sizes available Mining Equipment Rubber Processing Oil and Gas Mixers Drilling Calenders Pumps Shredders Textile Equipment Metals Industry (Steel, Aluminum, Copper and Brass). Bar and Rod Mills Runout Tables Cold Reduction Piercers Transfer Cars Continuous Casters Structural Mills Hot Strip Mills Scale Breakers Levelers Shears Payoff Reels Side Trimmers Pinch Rolls Coilers Straighteners Brush Rolls Temper Mills Bridles Tension Reels Flatteners Tube Mills Slitters Vertical Edgers Pipe Mills Wire Mills 3 3. 16 AM WE8491 APT 3 4/2/09 9:17 AM. Construction: Yoke Assembly and Bearing Design Basic Designs The Renold Universal Joint is available in seven basic bearing designs: 1000 Series Yoke assembly parts furnished by domestic manufacturers. Sizes RA1310-RA1550: Needle bearing design.

6 Bearing caps are retained by snap rings. Sizes RA1610-RA1880: Needle bearing design. Bearing caps are retained by bolts. Sizes RA1990: Uses two rows of roller bearings. Bearing caps are retained by snap rings. Lube fitting in center of cross. 2000 Series Sizes RA058-RA100: Needle bearing design. Lube fitting in center of cross. Sizes RA120-RA225: Uses two rows of roller bearings. Bearing caps are retained by snap rings. Lube fitting in RA250 - RA435. center of cross. Sizes RA250-RA435: Uses two rows of roller bearings Bearing caps are retained by snap rings. Lube fittings in center bearing cap is optional. Sizes RA440-RA920: Uses three or more rows of roller bearings. Includes replaceable inner races in the bearing assemblies. Bearing caps are retained by large snap rings. Lube fittings are in each bearing cap. D. RA440 - RA920. U3440 - U3920. 4 4. WE8491 APT 4 4/2/09 9:17 AM WE8.

7 Selection Information and Speed Limits I. Speed Limit Based on Limits of Table 1. Mass Acceleration When Universal joints are operated at any RA1310 - RA225. RA250. RA250. angle greater than zero, the center section 3200. RA285. of the Universal Joint always runs irregularly, RA315. being accelerated and decelerated twice in RA350. every revolution. The maximum values of mass RA390. RA435. acceleration torque arising here are dependent A. on the operating speed and angle of deviation A. and upon the moment of inertia of the center shaft section [ RPM x A ]. To ensure smooth running of the Universal Joint , the mass acceleration torque must not be allowed to exceed the limits shown in Table 1. II. Speed Limit Based on Lateral Critical Speed In applications where long lengths of shafts are required, the speed is restricted by the lateral critical speed of the center section.

8 This speed is a function of the center tube diameter wall thickness, and the effective length. The maximum operating speed must be less than the lateral Table 2. critical speed Nc shown in Table 2. RA1310. RA1350. 2188-3175. RA1710/RA1810. 3200. NOTE: 3225. 2188-3175. RA120/RA1610. Allowable Operating Speed = 3200. RA225. 3225. RA250. Nc x .75. RA285. RA315. RA350. In many applications, operation at 1/2 critical RA390. speed will also create unacceptable vibration. RA435. For these applications the operating speed should be 8% above or below 50% of the maximum indicated. For flange-to-flange lengths greater than shown, or if allowable speed is exceeded, contact Renold . III. Balancing All standard Universal joints under 300 RPM. are supplied unbalanced. Between 300-850. RPM they are balanced if required. Consult De factory for further information. Over 850 RPM. all Universal joints are normally supplied The speed limits on this page are only a guide.

9 The actual balanced. Please consult the factory for limits are determined by the characteristics of the system in special balancing requirements. which the Universal Joint is installed. CAT14. 5 5. 17 AM WE8491 APT 5 4/2/09 9:17 AM. Selection Procedure See pages 26-27 for Application Data Universal Joint Selection Where: sheets for easy selection. I. Calculate application torque (Ta) and N1 = fraction of total, time at operating selection torque (Ts). condition 1. Four types of torque ratings are given for each Joint size. L1 = life expectancy at operating Endurance torque (Te) is the normal Ta = HP x 63025 ( lb. x in. ) condition 1 (hours). N. rating for fully reversing torque based on m = total number of operating conditions material strength. Ta = KW x 9550 ( Nm ) IV. Determine Peak Torque conditions. One way endurance torque (Tow) is N. the normal rating for pulsating one way Tp must exceed the maximum torque based on material strength.

10 Operating torque. N = Speed (RPM). Life torque (TL) is the bearing life rating Ts = Selection Torque = Ta x Service Other considerations: of the Universal Joint . This torque is Factor (Table 3) There are many other items that can based on the B-10 life of the Universal determine the size of a Universal Joint . Ts must be less than Te for reversing Joint bearings. The life torque values These include: torque applications or Tow for one way listed are based on 5000 hours B-10. pulsating torque applications. 1. Diameter and length limitations. bearing life at 3 misalignment and 100 RPM. B-10 life is defined as the 2. Bore size (see page 19). II. Check to see if life is sufficient. minimum life expectancy for a 90% 3. Equipment restrictions on forces probability of survival. Typically the and moments. average actual operating life of the bearings is 5X the calculated B-10 life.