RV-N
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Precision Reduction Gear RV

Contributing to society with our ‘Moving it. Stopping it.’ technologies Nabtesco's technologies supporting society Nabtesco manufactures products which are used in everyday life. Our high-accuracy components are essential for moving objects; they may be rarely visible, but are the foundation of everyday objects that you see moving and wonder how. Nabtesco’s technologies are found throughout objects that move and stop people’ s lives. Do or s Ro bo ts Precision reduction gears precisely move and stop industrial robots. Co ns tru cti on ma ch ine ry Running motors and control valves start and...

CONTENTSWho is Nabtesco? The key words for Nabtesco are ‘motion control'. We use our strengths in the fields of component and systems technologies to develop highly creative products. Through the Nabtesco Group as a whole, we can also utilize our advantage of expertise to maximum effect in order to further enhance these strengths. In the air, on land and at sea, we have a leading share in various fields of both international and domestic markets. Nabtesco will continue to evolve by utilizing its strengths in many fields and by exploring the possibilities of the future. April 2002 Initiation...

RVTM precision reduction gears, already top sellers in the robotics industry, now evolved even further!! Compact N Series gears deliver great potential!! Based on our RV precision reduction gears which achieve 7 million units already shipped, the new N Series models have been made even more compact and lightweight.

(Compared with our existing products) (Compared with our existing products) External dimensions Model size comparison Model The same basic performance Compact and Lightweight Space-saving design for a wide range of uses Robotics Machine tools Food industry Wood processing Semiconductors Medical care Transportation Inspection / measurement 3

Examples of uses for the N series Vertical-articulated robot (joint shaft) SCARA robot Machine tool (turret of lathe) Machine tool ATC magazine

Glass substrate/wafer rotation and positioning Positioning turntable Cover open/close and reverser Medical device

Principle of speed reduction The RV is a 2-stage precision reduction gear. 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. 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 eccentric motion of the RV gears causes engagement of the cycloidal shaped gear teeth with cylindrically shaped pins located...

Product codei. Model code Frame number Series code Ratio code Input gear code A: Standard gear A B: Standard gear B Z: No gear Direction of rotation and gear ratio The overall speed ratio i (of the First and Second reduction stages) will differ between shaft rotation and case rotation, and can be calculated from the speed ratio. Case rotation Shaft rotation The sign “i” in the above equations signifies the speed reduction ratio of the output shaft rotation to the input shaft rotation. “+” signifies the output shaft rotation in the same direction as the input shaft. “-” signifies the same in...

Note: 1. The allowable output speed will differ depending upon the duty ratio, load, and ambient temperature. Contact us regarding use above the allowable output speed Ns1 with a 40% duty ratio. 2. The input capacity (kW) is calculated according to the following calculation formula: Note: The input capacity is a reference value. When the reduction gear is used at low temperatures, (Refer to “Low temperature characteristic” on page 35 3. efficiency (%) there will be a larger no-load running torque. Note this characteristic when selecting a motor.

T0 Rated torque (Note 7) Note: 4. The allowable moment will differ depending on the thrust load. Check the allowable moment diagram (p. 33). 5. The inertia moment value is for the reduction gear. It does not include the inertia moment for the input gear. 6. For the moment rigidity and torsional rigidity, refer to the calculation of tilt angle and the torsion angle (p. 38). 7. The rated torque is the value that produces the rated service life based on operation at the rated output speed; it does not indicate the maximum load. Refer to the “Glossary” (p.23) and the “Product selection...

Specifications and dimensions are subject to change without notice. External dimensions

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice. *Contact us for more information on this model.

Specifications and dimensions are subject to change without notice.

Specifications and dimensions are subject to change without notice.

Technical Information

Considering the use of the N 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...

Rating service life The lifetime resulting from the operation with the rated torque and the rated output speed is referred to as the “rated service life”. Allowable acceleration/deceleration torque When the machine starts or stops, the load torque to be applied to the reduction gear is larger than the constant-speed load torque due to the effect of the inertia torque of the rotating part. In such a situation, the allowable torque during acceleration/deceleration is referred to as “allowable acceleration/deceleration torque”. Note: Be careful that the load torque, which is applied at startup...