RV-Gears - 136 Pages

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Catalogue excerpts

Precision Reduction Gear RVTM E Series / C Series / Original Series

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The RV E, C, and Original Series are 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. Furthermore, minimal backlash, rotary vibration and inertia assure rapid acceleration, smooth motion and extremely accurate positioning. The Precision Reduction Gear RV is ideally suited for precision mechanical control in factory robots, machine tools, and assembly and conveying equipment where precise...

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Precision Reduction Gear RVTM Technical Data 1 Ordering Information—————————————————————————————————————————————————— 1 Considering the use of the RVTM E, C, and Original Series— —————————————————————————————————— 5 3 E Series 2 Rotary Direction and Speed Ratio–––––92 3 Rotary Direction and Speed Ratio–––––10 1 Features and Benefits––––––––––––––54 3 Rotary Direction and Speed Ratio–––––56 4 Ratings Table–––––––––––––––––––––––57 6-1 Rigidity (Torsional rigidity and lost motion) and backlash– –––––––––––––––––18 – 6-1-1 Calculation of torsion (an example)–––––––18 6-2 Vibration– ––––––––––––––––––––––––––––19...

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1 Ordering Information ■ E series • Product identification for ordering purpose. Type symbol output shaft output shaft Type of input gear or input spline A Standard type A (Narrow type) B Standard type B (Big diameter type) Z Special (none) 1 Speed ratio (reduction ratio — ) R 〈Ex. RV-80E〉 shaft rotation Notes 1. Refer to the Rating Table for other type. 2. Specify the shaft rotating speed ratio of your application. Model ● E Main bearing built-in type ■ C series • Product identification for ordering purpose. Type symbol output shaft clamping output shaft Profile of center gear A Standard type...

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■ Original series • Product identification for ordering purpose. Type symbol output shaft • T Through-bolt clamping output shaft Rated output torque In-lb(Nm) 1,213 137 Model No mark Standard type Type of input gear or input spline A Standard type A (Narrow type) B Standard type B (Big diameter type) Z Special (none) 1 Speed ratio (reduction ratio — ) R 〈Ex. RV-60〉 shaft rotation 57, 81, 101, 121, 153 R Notes 1. Refer to the rating table for other type. 2. Specify the shaft rotating speed ratio of your application.

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Robot swing axis C series • Allows space-saving design • Main bearing is not required on robot side. Robot arm C series • As cables can be passed through the arm, environmental resistance increases. • Wider operating angle. Indexing table C series • The table can be made into a hollow shaft structure.

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Robot wrist axis E series 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 Original series

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Considering the use of the RVTM E, C, and Original Series This product features high precision and high rigidity, however, it is necessary to strictly comply with various restrictions and make appropriate to maximize the product’s features. Please read this technical document thoroughly and select and adopt an appropriate model based on the actual operating environment, method, and conditions at your facility. Export • When this product is exported from Japan, it may be subject to the export regulations provided in the “Foreign Exchange Order and Export Trade Control Order”. Be sure to take sufficient...

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Precision Reduction Gear RVTM

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1 Features and Benefits Integrated angular ball bearings 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. Benefits: • Increases reliabilty • Reduces overall cost 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...

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2 Construction and Operation Principle ■ Construction Case RV gear Main bearing Shaft Hold flange Input gear (Option) Crankshaft Spur gear ■ Principle of speed reduction The E series 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...

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3 Rotary Direction and Speed Ratio The E series may be used in various ways. The following figures show six combinations of the rotary direction and speed ratio. Use the following figure to select a mechanism most suitable for your application. Fig. 4 1. Case fixed, shaft output 2. Shaft fixed, case output Speed increasing gear 5. Shaft fixed, input gear output Input: Shaft 6. Input gear fixed, case output Input: Case 4. Case fixed, input gear output Input: Input gear 1 —— i= ― — R―1 Input: Input gear 1 i= — R Reduction gear 3. Input gear fixed, shaft output • The sign "i" in the above equations...

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4 Rating Table Table 1 Output speed (r/min) Output Input Output Input Output Input Output Input Output Input Output Input Output Input Speed ratio torque capacity torque capacity torque capacity torque capacity torque capacity torque capacity torque capacity Model Shaft Case Nm Nm Nm Nm Nm Nm Nm kW kW kW kW kW kW kW rotation rotation (kgf-m) (kgf-m) (kgf-m) (kgf-m) (kgf-m) (kgf-m) (kgf-m) 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)...

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