Nabtesco Precision Equipment Company

RV-E SERIES
Features and Configurations
Principle of Operation
Model Code
Rating Table

Features and Configurations

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.

Reduces vibration
Reduces inertia(GD²)
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

Higher torsional stiffness
Less vibration
High shock load capability (5 times rated torque)
Crankshafts are supported on both sides of the reduction gear as shown below.

Excellent starting efficiency
Low wear and longer life
Low backlash (Less than 1 arc. min.)
Use of roller bearings throughout.

Very low backlash (Less than 1 arc. min.)
Higher shock load capability (5 times rated torque)
Synchromeshing of many RV gear teeth and pins.

Principle of Operation

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

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.

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 directions 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.

Model Code

Product identification for ordering purpose.

Rating Table

Output speed 5-25 Output speed 30-60,Tooth width,I（=GD²/4) Input inertia Other（Moment rigidity,Allowable moment etc.)

■ Output speed 5-25

Output speed（r/min)			5		10		15		20		25
Model	Speed ratio		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
Model	Shaft rotation	Case rotation	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

31	30	895 (101)	0.07	717 (81)	0.11	638 (72)	0.15	585 (66)	0.19	549 (62)	0.22
43	42
53.5	52.5
59	58
79	78
103	102
57	56	2,046 (231)	0.16	1,665 (188)	0.26	1,479 (167)	0.35	1,355 (153)	0.43	1,266 (143)	0.50
81	80
105	104
121	120
141	140
161	160
57	56	5,066 (572)	0.40	4,118 (465)	0.65	3,649 (412)	0.86	3,339 (377)	1.05	3,126 (353)	1.23
81	80
105	104
121	120
153	152
57	56	9,636 (1,088)	0.76	7,838 (885)	1.24	6,944 (784)	1.64	6,368 (719)	2.01	5,952 (672)	2.35
81	80
101	100
121	120
（153)^※1	（152)^※1
81	80	13,276 (1,499)	1.05	10,761 (1,215)	1.70	9,547 (1,078)	2.26	8,768 (990)	2.76	8,192 (925)	3.23
111	110
161	160
175.28^※2	174.28
81	80	(2,176)	1.52	(1,774)	2.48	(1,568)	3.28	(1,441)	4.02	(1,343)	4.69
101	100
129	128
145	144
171	170
81	80	38,624 (4,361)	3.04	31,335 (3,538)	4.94	27,774 (3,136)	6.57	25,516 (2,881)	8.05	23,869 (2,695)	9.41
101	100
118.5	117.5
129	128
141	140
171	170
185	184
81	80	54,335 (6,135)	4.28	44,088 (4,978)	6.95	39,058 (4,410)	9.24	35,843 (4,047)	11.3	33,505 (3,783)	13.2
101	100
118.5	117.5
129	128
154.8^※2	153.8
171	170
192.4^※2	191.4

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■ Output speed 30-60,Tooth width,I（=GD²/4) Input inertia

Output speed（r/min)	30		40		50		60		Tooth width mm	I（=GD²/4) Input inertia Kg-m²
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	Tooth width mm	I（=GD²/4) Input inertia Kg-m²

514 (58)	0.25	478 (54)	0.30	443 (50)	0.35	416 (47)	0.40	6	3.75×10^-6
									2.60×10^-6
									1.84×10^-6
									1.63×10^-6
									1.09×10^-6
									0.79×10^-6
1,196 (135)	0.57	1,098 (124)	0.70	1,019 (115)	0.81	974 (110)	0.92	8	1.08×10^-5
									0.65×10^-5
									0.45×10^-5
									0.37×10^-5
									0.29×10^-5
									0.24×10^-5
2,958 (334)	1.40	2,719 (307)	1.71	2,542 (287)	2.00	2,400 (271)	2.27	10	3.75×10^-5
									2.40×10^-5
									1.72×10^-5
									1.43×10^-5
									1.03×10^-5
5,642 (637)	2.67	5,172 (584)	3.26	4,836 (546)	3.81	4,579 (517)	4.33	10	8.28×10^-5
									5.65×10^-5
									4.40×10^-5
									3.53×10^-5
									2.63×10^-5
7,750 (875)	3.67	7,121 (804)	4.49					13	1.08×10^-4
									0.73×10^-4
									0.45×10^-4
									0.40×10^-4
11,283 (1,274)	5.34							15	1.96×10^-4
									1.51×10^-4
									1.11×10^-4
									0.90×10^-4
									0.76×10^-4
22,567 (2,548)	10.7							16	5.23×10^-4
									4.00×10^-4
									3.28×10^-4
									2.95×10^-4
									2.63×10^-4
									2.01×10^-4
									1.79×10^-4
								18	8.93×10^-4
									6.95×10^-4
									5.75×10^-4
									5.18×10^-4
									4.08×10^-4
									3.58×10^-4
									3.03×10^-4

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■ Other（Moment rigidity,Allowable moment etc.)

Model	Moment rigidity (Typical Value) In-lb/ arc.min. （Nm/arc.min.)	Allowable moment In-lb (Nm)	Momentary max. allowable moment (Shockload) In-lb (Nm)	Allowable max. output speed (Continuous) r/min	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.)	Weight lb(kg)
	1,036 (117)	1,736 (196)	3,472 (392)	100	1,036 (117)	2,604 (294)	1.5′	177 (20)	5.5(2.5)
	3,295 (372)	7,812 (882)	15,623 (1,764)	75	3,649 (412)	7,378 (833)	1′	434 (49)	9.68(4.4)
	8,245 (931)	14,755 (1,666)	29,510 (3,332)	70	9,113 (1,029)	18,227 (2,058)	1′	957 (108)	20.9(9.5)
	10,415 (1,176)	Bolt joint 19,095 (2,156)	Bolt joint 38,190 (4,312)	70	17,359 (1,960)	Bolt joint 34,718 (3,920)	1′	1,736 (196)	27.9 (12.7)
	10,415 (1,176)	Pin/bolt joint 15,366 (1,735)	Pin/bolt joint 19,095 (2,156)	70	17,359 (1,960)	Pin/bolt joint 28,208 (3,185)	1′	1,736 (196)	27.9 (12.7)
	13,019 (1,470)	26,038 (2,940)	52,077 (5,880)	50	23,869 (2,695)	47,737 (5,390)	1′	2,604 (294)	39.6(18.0)
	26,038 (2,940)	34,718 (3,920)	Bolt joint 69,436 (7,840)	45	34,718 (3,920)	Bolt joint 69,436 (7,840)	1′	3,472 (392)	61.6(28)
	26,038 (2,940)	34,718 (3,920)	Pin/bolt joint 59,888 (6,762)	45	34,718 (3,920)	Pin/bolt joint 58,586 (6,615)	1′	3,472 (392)	61.6(28)
	43,397 (4,900)	Bolt joint 62,492 (7,056)	Bolt joint 124,984 (14,112)	35	69,436 (7,840)	Bolt joint 138,872 (15,680)	1′	8,679 (980)	103.4(47)
	43,397 (4,900)	Pin/bolt joint 54,681 (6,174)	Pin/bolt joint 97,210 (10,976)	35	69,436 (7,840)	Pin/bolt joint 108,493 (12,250)	1′	8,679 (980)	103.4(47)
	65,964 (7,448)	78,115 (8,820)	Bolt joint 156,230 (17,640)	25	97,644 (11,025)	Bolt joint 195,288 (22,050)	1′	10,415 (1,176)	151.8(69)
	65,964 (7,448)	78,115 (8,820)	Pin/bolt joint 119,777 (13,524)	25	97,644 (11,025)	Pin/bolt joint 164,910 (18,620)	1′	10,415 (1,176)	151.8(69)

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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.
3. The output torque (In-lb) is so determined that the service life may be maintained constant for any output revolutions.
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, however, has its rated torque determined as the output torque at an output speed of 30 r/min.
5. The value is a value considering both gear tooth widths of reduction gear assembly and input gear.
The value at the shaft of the input gear is not included.
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. (page 25)
※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 output revolution is for forward-reverse changeover applications and not applicable for continuous rotation in a single direction.
Contact us when using the reduction gear for continuous single-direction rotation.

RV SERIES

Features and Configurations

Principle of Operation

Model Code

Rating Table