Nabtesco Precision Equipment Company

Increases reliabilty
Reduces overall cost
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.

The RV-C is a 2-stage reduction gear.

An input gear engages with and rotates a center gear which then engages and rotates
spur gears that are coupled to crankshafts. Several overall gear ratios can be provided
by selecting various first stage ratios.

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 around the inside edge of the case.
In the course of one revolution of the crankshafts the teeth of the RV gear move the
distance of one pin in the opposite direction of the rotating cranks. The motion of the
RV gear is such that the teeth remain in close contact with the pins and many teeth
share the load simultaneously.
The output can be either the shaft or the case. If the case is fixed, the shaft is the
output. If the shaft is fixed, the case is the output.

Product identification for ordering purpose.

Output speed 5-25 Output speed 30-60,Moment rigidity Typical Value etc. Other（Allowable acceleration/ deceleration torque,Momentary max.allowable torque etc.）

■ Output speed 5-25

Output speed（r/min）		5		10		15		20		25
Model	Speed ratio of a discrete reduction gear （R₁）	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW
	27	1,204 (136）	0.09	983 (111）	0.16	868 (98）	0.21	797 (90）	0.25	744 (84）	0.29
	36.57 (1,390/38）	3,259 (368）	0.26	2,648 (299）	0.42	2,347 (265）	0.55	2,152 (243）	0.68	2,010 (227）	0.79
	32.54 (1,985/61）	6,031 (681）	0.48	4,907 (554）	0.77	4,340 (490）	1.03	3,985 (450）	1.26	3,720 (420）	1.47
	36.75	12,063 (1,362）	0.95	9,804 (1,107）	1.55	8,679 (980）	2.05	7,962 (899）	2.51	7,448 (841）	2.94
	34.86 (1,499/43）	24,125 (2,724）	1.90	19,617 (2,215）	3.09	17,368 (1,961）	4.11	15,968 (1,803）	5.04	14,932 (1,686）	5.88
	35.61 (2,778/78）	38,624 (4,361）	3.04	31,335 (3,538）	4.94	27,774 (3,136）	6.57	25,516 (2,881）	8.05	23,824 (2,690）	9.41
	37.34	60,322 (6,811）	4.75	49,039 (5,537）	7.73	43,397 (4,900）	10.26	39,837 (4,498）	12.56

■ Output speed 30-60,Moment rigidity Typical Value etc.

Output speed（r/min）	30		40		50		60		Moment rigidity Typical Value In-lb/arc.min. （Nm/ arc.min.)	Allowable moment In-lb (Nm)	Momen tary max. allowable moment (Shock load) In-lb (Nm)	Allow able max. output speed (Conti nuous) r/min
Model	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW	Output torque In-lb (Nm)	Input capacity kW		Allowable moment In-lb (Nm)	Momen tary max. allowable moment (Shock load) In-lb (Nm)	Allow able max. output speed (Conti nuous) r/min
	709 (80）	0.34	647 (73）	0.41	602 (68）	0.47	576 (65）	0.54	3,726 (421）	6,076 (686）	12,151 (1,372）	80
	1,904 (215）	0.90	1,745 (197）	1.10	1,630 (184）	1.29	1,541 (174）	1.46	9,452 (1,068）	8,679 (980）	17,359 (1,960）	60
	3,525 (398）	1.67	3,242 (366）	2.04	3,020 (341）	2.38			17,346 (1,960）	15,623 (1,764）	31,246 (3,528）	50
	7,050 (796）	3.33	6,465 (730）	4.08					24,895 (2,813）	21,699 (2,450）	43,397 (4,900）	40
	14,144 (1,597）	6.69							86,730 (9,800）	78,115 (8,820）	156,230 (17,640）	30
									112,830 (12,740）	182,269 (20,580）	347,179 (39,200）	25
									216,990 (24,500）	303,781 (34,300）	694,358 (78,400）	20

■ Other（Allowable acceleration/ deceleration torque,Momentary max.allowable torque etc.）

Model	Allowable acceleration/ deceleration torque In-lb (Nm)	Momentary max. allowable torque (E-stop) In-lb (Nm)	Lost motion MAX. arc.min.	Torsional rigidity (Stiffness) Typical Value In-lb/ arc.min. (Nm/ arc.min.)	I（=GD²/4) Inertia of reduction gear unit Kg-m²	I（=GD²/4) Inertia of center gear Kg-m²	Weight lb(kg)
	2,170(245）	4,340(490）	1	416(47）	1.34×10^-5	0.678×10^-3	10.1(4.6)
	5,863(662）	11,717(1,323）	1	1,302(147）	0.628×10^-4	0.563×10^-3	18.7(8.5)
	10,849(1,225）	Bolt joint 21,699(2,450）	1	2,258(255）	1.82×10^-4	0.363×10^-2	33.1(15)
	10,849(1,225）	Through -bolt joint 17,359(1,960）	1	2,258(255）	1.82×10^-4	0.363×10^-2	33.1(15)
	21,699(2,450）	Bolt joint 43,397(4,900）	1	4,517(510）	0.47×10^-3	0.953×10^-2	43.0(19.5)
	21,699(2,450）	Through -bolt joint 30,378(3,430）	1	4,517(510）	0.47×10^-3	0.953×10^-2	43.0(19.5)
	43,397(4,900）	Bolt joint 86,795(9,800）	1	8,679(980）	0.995×10^-3	1.94×10^-2	125.7(57)
	43,397(4,900）	Through -bolt joint 65,096(7,350）	1	8,679(980）	0.995×10^-3	1.94×10^-2	125.7(57)
	69,436(7,840）	138,872(15,680）	1	17,359(1,960）	0.68×10^-2	0.405×10^-1	176.4(80)
	108,493(12,250）	216,987(24,500）	1	30,378(3,430）	0.98×10^-2	―	352.7(160)

Note ：

1. The overall speed ration is calculated with the formula in page 56.
2. Set maximum input shaft speed to a value equal to or lower than the value of maximum allowable output speed multiplied
by the overall speed ratio for each type.
3. The input capacity (KW) in the above table is determined by the efficiency of these reduction gears.
4. The output torque (In-lb) is so determined that the service life may be maintained constant for any output revolutions.
5. 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 61.)
6. The value is a value for a discrete reduction gear, and the for center and input gears is not included.
Therefore, refer to the following equation regarding the converted to motor shaft.
7. If a higher speed than the above allowable maximum output speed is required, contact Nabtesco for further information.
8. The output revolution is for forward-reverse changeover applications and not applicable for continuous rotation in a single direction.
Contact Nabtesco when using the reduction gear for continuous single-direction rotation.

RV SERIES