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RV series - 134 Pages

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Catalogue excerpts

The RV Series is a family of planocentric reduction gear mechanisms designed for precise motion control. The mechanisms incorporate a large number of simultaneously engaged gear teeth, and have compact, lightweight and highly rigid construction that is strong against overloading. Furthemore, minimal backlash, rotary vibration and inertia assure rapid acceleration, smooth motion and extremely accurate positioning. The RV Series reduction gears are ideally suited for precision mechanical control in factory robots, machine tools, and assembly and conveying equipment where precise positioning, stiffness...

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Reducer For High Precision Control Technical data - Rigidly built reduction gear for high precision control Construction and Operation Principle Rotary Direction and Speed Ratio Ratings Table Performance Characteristics 7-1 Assembly accuracy 23 7-2 Installation procedure 23 7-2-1 Bolt clamping output shaft type 23 7-2-2 Pin/bolt clamping output shaft type 24 7-3 Bolt tightening torque and allowable transmission torque 25 7-4 Installation of input gear 26 7-4-1 Precautions for input gear installation of RV-6E, 20E and 40E input gears 27 7-4-2 Pass-through capacity of input gear 27 7-4-3 An example...

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► Product identification for ordering purpose. Type symbol* [C] Hollow shaft type output shaft clamping output Profile of center gear -•Speed ratio (reduction ratio Notes 1. Here, 36.75 applies to the RV-1OOC. 2. See Ratings Table for speed ratios of other frame 3. Specify the shaft rotating speed ratio of your

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► Product identification for ordering purpose. | No mark | Standard type _ output shaft clamping output • Type of input gear or input spline [A] Standard type A (Narrow type) [B] Standard type B (Big diameter type) ■•Speed ratio (reduction ratio = ~R) Notes 1. Refer to the rating table for other type. 2. Specify the shaft rotating speed ratio of your

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©APPLICATION EXAMPLES Robot Swing Axis •Allows space-saving design •Main bearing is not required on robot side. •Greater internal resistance to adverse enovironments-allows safe •Wider operating angle. Indexing Table

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Robot Wrist Axis As shown in the figure(right), the input gear can also be supported within the reduction gear mechanism. Please contact Nabtesco for more details. Robot Swing Axis

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Benefits: Increases reliabilty Reduces overall cost Attributed to: Built-in angular ball bearing construction improves ability to support external loads, increases moment rigidity and maximum allowable moment. Reduces the number of components required. Simplifies installation and maintenance. 2 STAGE REDUCTION Benefits: Reduces vibration Reduces inertia (GD2) Attributed to: Low speed rotation of the RV gear reduces vibration. Reduced size of the motor coupling part (input gear) lowers intertia. ALL MAIN ELEMENTS ARE SUPPORTED ON BOTH SIDES Benefits: Higher torsional stiffness Less vibration High...

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2 CONSTRUCTION and OPERATION PRINCIPLE Construction Case RV gear Main bearing Hold flange Input gear Crankshaft Spur gear Principle of speed reduction The RV-E is a 2-stage reduction gear. 1st stage Spur gear reduction An input gear engages with and rotates spur gears that are coupled to crankshafts. Several overall gear ratios can be provided by selecting various first stage ratios. 2nd stage Epicyclic gear reduction Crankshafts driven by the spur gears cause an eccentric motion of two epicyclic gears called RV gears that are offset 180 degrees from one another to provide a balanced load. The...

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3 ROTARY DIRECTION and SPEED RATIO Fig.4 qCase fixed, shaft output wShaft fixed, case output eInput gear fixed, shaft output Input:Input gear Input:Input gear Reduction gear rCase fixed, input gear output tShaft fixed, input gear output yInput gear fixed, case output Speed increasing gear u When all the components are in rotating motion, the applicable combinations are as illustrated in q through y above. This mechanism can be used also as a differential u. Mechanism block diagram The sign "i " in the above equations signifies the output shaft rotation in the same direction as the input shaft."-"...

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Notes: 1. Set maximum input shaft revolutions to a value equal to or lower than the value of maximum allowable output revolutions multiplied by the above speed ratio for each type. 2. The input capacity (kW) in the above table is determined by the efficiency of these reduction gears. m 3. The output torque (In-lb) is so determined that the service life may be maintained constant for any output revolutions. (N-T 3 = Constant) 4. The rated torque is a torque at an output speed of 15 r/min, which is used as a basis for service life calculations. (Refer to the rated service life, page 15) The RV-6E,...

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(Typical Value) (Typical Value) (Input inertia) Bolt joint Bolt joint Pin/bolt joint Bolt joint Bolt joint Bolt joint Bolt joint Bolt joint Pin/bolt joint Bolt joint Bolt joint Bolt joint 6. If a higher speed than the above allowable maximum output speed is required, contact Nabtesco for further information. 7. If other speed ratio than the above list is required, contact Nabtesco for further information. 8. *1 RV-80E, R=153 is used only for output shaft bolt-on type. (page25) *2 These reduction gear ratios are indivisible figures. Actually, 175.2=1,227/7,154.8=2,013/13 and 192.4=1,347/7. 9. The...

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5 RV-E SELECTION 5-1 Selection flow chart Determine load characteristics Fig.6 Duty cycle diagram Check the load torque applied to the reduction gear. An example is shown in fig. 6. Calculate average load torque (Tm) Calculate average output speed (Nm) Output speed From the ratings table Table 2 Conditions to be determined for selection Output torque For For impact due stopping to emergency (Max) stop Load torque In-lb Speed r/min Time sec Temporary selection of frame number Service life calculation (Lh) Increase the frame number or reduce the load. See page 15 Determine the input speed Input...

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main bearing capacity Check the external load Determine output shaft external bearing Selection example Selection conditions Determine load characteristic •Determine average load torque •Determine average output speed •Calculation to determine whether reduction gear service life meets required specification value. •Determine output speed Maximum output speed 20r/min<45r/min ^Maximum allowable output speed of RV-160E) •Determine torque during starting and stopping (^Allowable acc./dec. torque tor RV-160E ) ^Allowable acc./dec. torque tor RV-160E ) •Determine emergency stop and external shock torque (Momentary...

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