Nabtesco RV RH E Series User manual

ERD15018A
2016/10/01
Precision Reduction Gear RV
TM
High Precision Gearhead
RH Series
Operation Manual
<Applicable model>
RH-E
RH-C
RH-N
above indicates the torque code (number).
For the applicable models, refer to “Model” indicated on the shipping label of the product.
This manual must be thoroughly read and understood before using the product.
Be sure to deliver this operation manual to the system manager and the person in
charge of the operation.
Keep this manual in the specified location so that it can be immediately referred to
whenever necessary.
®

Contents
Important Information .........................................................................................................................................i
1. Intended use of this product ..................................................................................................................... i
2. Rules to ensure safe use of this product ................................................................................................... i
3. Sharing of hazard information with users ............................................................................................... ii
4. Product disposal ...................................................................................................................................... ii
5. Other important notes ............................................................................................................................. ii
About This Manual ..............................................................................................................................................iii
1. Users of this manual ............................................................................................................................... iii
2. Copyrights .............................................................................................................................................. iii
Warranty .......................................................................................................................... iv
Glossary ............................................................................................................................ v
Chapter 1 About safety ................................................................................................. 1
1.1. About warnings.......................................................................................................................................... 1
1.2. Type and indication of warning.................................................................................................................. 1
1.3. General precautions.................................................................................................................................... 2
Chapter 2 Product overview......................................................................................... 3
2.1. Name of each section ................................................................................................................................. 3
Chapter 3 Transportation and storage of product...................................................... 6
3.1. Transportation ............................................................................................................................................ 6
3.2. Storage ....................................................................................................................................................... 7
Chapter 4 Preparations for installation ....................................................................... 8
4.1. Installation environment ............................................................................................................................ 8
4.2. Preparation of required components .......................................................................................................... 9
4.3. Unpacking................................................................................................................................................ 14
4.4. Lifting of this product .............................................................................................................................. 16
Chapter 5 Installation.................................................................................................. 17
5.1. Bolt tightening torque .............................................................................................................................. 17
5.2. Installation work ...................................................................................................................................... 18
Contents

Contents
Chapter 6 Filling the Lubricant .................................................................................. 36
6.1. Precautions when handling the lubricant ................................................................................................. 36
6.2. Reduction gear mounting direction and amount of lubricant................................................................... 38
6.3. Lubricant filling procedure ...................................................................................................................... 40
Chapter 7 Operation.................................................................................................... 42
7.1. Checking before operation....................................................................................................................... 42
7.2. Running-in operation ............................................................................................................................... 42
7.3. Precautions for operation ......................................................................................................................... 42
Chapter 8 Maintenance and Inspection..................................................................... 43
8.1. Precautions on maintenance..................................................................................................................... 43
8.2. Daily inspection ....................................................................................................................................... 43
8.3. Lubricant replacement.............................................................................................................................. 44
8.4. Troubleshooting checksheet..................................................................................................................... 47
Contact information

Important Information
i
1. Intended use of this product
This product was designed and manufactured as a reduction gear that decelerates the rotation of the motor
and transmits the rotational torque. Do not use this product for other purposes.
Do not modify the reduction gear or use it outside its specified range. Failure to do so could cause
injury or damage to the reduction gear.
The specifications indicated in the specification sheet are based on Nabtesco evaluation methods.
This product should only be used after confirming that it is appropriate for the operating conditions of
your system. Failure to do so could cause injury or damage to the reduction gear.
2. Rules to ensure safe use of this product
It is impossible for Nabtesco Corporation (referred to as “Nabtesco” hereafter) to foresee any potential
hazards related to this product and hazards caused by human errors or peripheral devices.
There are also various points that must be observed and operations that are prohibited in relation to the
use of this product, but it is also impossible to note all of them in this manual.
For this reason, it is necessary to take appropriate safety measures when operating this product, in
addition to the points noted in this manual.
The particularly important information for safe handling of this product is noted below. This information
applies to all workers involved, including the manager and supervisor of this product.
The “procedures” referred to in this manual indicate all the acts performed on this product during
transportation, installation, operation, and maintenance/inspection.
Be sure to read this manual
Before using this product, thoroughly read this manual and understand all the content of this manual.
Also, observe the safety precautions described in this manual.
Conditions for workers
• The worker must have a fundamental knowledge of this product
• The worker must be aware of the potential hazards of this product and have adequate knowledge to
avoid hazardous situations
• The worker must be able to take appropriate measures to avoid hazardous situations
Important Information

Important Information
ii
Observe the relevant laws, regulations, ordinances, and bylaws.
Observe the relevant laws, regulations, ordinances, and bylaws enacted by the related countries and
local governments.
Prevention of accidents
• To prevent accidents, do not perform any procedures not noted in this manual. Also, do not use this
product for any purposes other than those noted at the beginning of this manual.
• If any abnormalities are found, take appropriate measures immediately to prevent any accidents,
serious injury, or damage.
• Everyone, including workers and supervisors, must voluntarily take measures to ensure safety and
well-being, as this can prevent accidents.
3. Sharing of hazard information with users
When selling or transferring this product embedded in a device, etc., hand this manual to the person who
actually uses or manages the device (the person/group in charge). Or, add the necessary information
concerning handling and maintenance procedures for preventing the accidents and failures described in
this manual to the contents of the operation manual of the device.
4. Product disposal
When disposing of this product, drain the lubricant completely and handle it according to the ordinances
of the local government and entrust the disposal to an industrial waste disposal specialist.
5. Other important notes
It is strictly prohibited to reverse-engineer the internal parts of this product.

About This Manual
iii
1. Users of this manual
This manual is intended for native speakers of English. If this product is operated by non-native speakers
of English, the customer is responsible for conducting safety training and giving operation instructions to
those workers.
2. Copyrights
The copyright for this manual belongs to Nabtesco Corporation. Unauthorized reprinting, reproduction,
copying, or translation of this manual in whole or in part is strictly prohibited.
About This Manual

Warranty
iv
1. In the case where Nabtesco confirms that a defect of the Product was caused due to
Nabtesco’s design or manufacture within the Warranty Period of the Product,
Nabtesco shall repair or replace such defective Product at its cost. The Warranty
Period shall be from the delivery of the Product by Nabtesco or its distributor to you
(“Customer”) until the end of one (1) year thereafter, or the end of two thousand
(2,000) hours from the initial operation of Customer's equipment incorporating the
Product at end user's production line, whichever comes earlier.
2. Unless otherwise expressly agreed between the parties in writing, the warranty
obligations for the Product shall be limited to the repair or replacement set forth
herein. OTHER THAN AS PROVIDED HEREIN, THERE ARE NO
WARRANTIES ON THE PRODUCT, EXPRESS OR IMPLIED, INCLUDING
WITHOUT LIMITATION ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
3. The warranty obligation under Section 1 above shall not apply if:
a) the defect was caused due to the use of the Product deviated from the Specifications or the
working conditions provided by Nabtesco;
b) the defect was caused due to exposure to foreign substances or contamination (dirt, sand,
etc.)
c) lubricant or spare part other than the ones recommended by Nabtesco was used in the
Product;
d) the Product was used in an unusual environment (such as high temperature, high humidity,
a lot of dust, corrosive/volatile/inflammable gas, pressurized/depressurized air, under
water/liquid or others except for those expressly stated in the Specifications);
e) the Product was disassembled, re-assembled, repaired or modified by anyone other than
Nabtesco;
f ) the defect was caused due to the equipment into which the Product was installed;
g) the defect was caused due to an accident such as fire, earthquake, lightning, flood or others;
or
h) the defect was due to any cause other than the design or manufacturing of the Product.
4. The warranty period for the repaired/replaced Product/part under Section 1 above
shall be the rest of the initial Warranty Period of the defective Product subjected to
such repair/replace.
Warranty

Glossary
v
Rated 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 and stop, does not exceed the allowable
acceleration/deceleration torque.
Momentary maximum allowable torque
A large torque may be applied to the reduction gear due to execution of emergency stop or by an external
shock. In such a situation, the allowable value of the momentary applied torque is referred to as
“momentary maximum allowable torque”.
Note: Be careful that the momentary excessive torque does not exceed the momentary maximum
allowable torque.
Allowable output speed
The allowable value for the reduction gear’s output speed during operation without a load is referred to as
the “allowable output speed”.
Note: Depending on the conditions of use (duty ratio, load, ambient temperature), the reduction gear
surface temperature may exceed 60°C even when the speed is under the allowable output speed. In
such a case, either take cooling measures or use the reduction gear at a speed that keeps the surface
temperature at 60°C or lower.
Allowable moment and maximum thrust load
The external load moment or thrust load may be applied to the reduction gear during normal operation.
The allowable values at this time are referred to as “allowable moment” and “maximum thrust load”
respectively.
Note 1: The above specification values are noted in the catalog or separately provided specification sheet.
Note 2: The “reduction gear” described in this manual indicates the precision gearhead RH series of the
product.
Glossary
Load torque
Time
External shock torque
Max. torque for startup
Constant torque
Shock torque at
emergency stop
Max.
torque for
stop

Chapter 1 About safety
1
Chapter 1 About safety
The safety precautions noted in this chapter should be used as guidelines to prevent injury of workers who
perform transportation, installation, operation, and maintenance of this product, as well as damage to the
product.
1.1. About warnings
This manual alerts workers to hazardous situations and precautions related to this product in the following
manner:
1. Safety regulations are described in Chapter 1 “About safety” in this manual
2. Warning statements are noted in this manual
1.2. Type and indication of warning
Warnings for potential hazards during operation are given according to the following four categories in
this manual. If you fail to observe these warning statements, it could result in lethal injury or serious
damage and malfunction of the product.
Indicates a hazardous situation that, if not avoided, is highly likely to result in death or
serious injury.
Indicates a potentially hazardous situation that, if not avoided, could result in death or
serious injury.
Indicates a potentially hazardous situation that, if not avoided, could result in minor or
moderate injury.
Indicates a potentially hazardous situation that, if not avoided, could result in physical
damage.
Provides important information for correct use of this product, as well as supplemental
explanation for the main body of the text or other information that helps to prevent
erroneous operation.
Note
Important

Chapter 1 About safety
2
1.3. General precautions
This section describes general precautions for safe use of this product. For precautions concerning
transportation, installation, operation, maintenance, and inspection, be sure to confirm the contents of the
relevant chapter.
Do not modify or disassemble the reduction gear in a manner not described in this manual. Failure
to do so could cause injury or damage to the reduction gear.
Transportation, installation, operation, maintenance, and inspection of the reduction gear must be
performed by personnel who fully understand this manual. The person in charge of the operation
and manager of the reduction gear must not allow anyone without an understanding of the contents
of this manual to operate it. Failure to do so could cause injury or damage to the reduction gear.
Do not put your fingers or any object into the opening of the reduction gear. If a belt or chain is used
for connection of the drive sections, do not put your fingers or any object into the clearance of the
protective cover, etc., as it could cause injury.
If any abnormalities or damage to the reduction gear are found, stop the operation immediately.
Incorrect motion could cause injury.
The reduction gear could become extremely hot during operation. After stopping the operation,
never touch the reduction gear until it is completely cooled. Touching the reduction gear could cause
burns.
Handle the lubricant according to the instructions given in this manual. Failure to do so could impair
your health.
This reduction gear may not be filled with lubricant, depending on the customer's specifications. For
such product, fill it with an appropriate amount of Nabtesco-recommended lubricant before use.
Failure to do so could cause damage to the reduction gear.
Return the tools and other necessary items to the specified location after use. If a tool, bolt, nut, or
other foreign object is trapped in the system, it could cause damage to the reduction gear.
Avoid excessive impact or vibration of the reduction gear. Failure to do so could cause damage to
the reduction gear.
Note

Chapter 2 Product overview
3
Tapped hole for
installing
reduction gear
Hole for installing
component
Case
Middle flange Oil seal
Shaft flange
Tapped hole for
injecting/draining grease
(component to be fixed)
Tapped hole for injecting/draining
grease (component to be fixed)
図2-1
給排脂口
(回転部材 )
部材取付用メネジ
減速機取付用穴
Case
Middle flange Oil seal
Shaft flange
Tapped hole
for installing
component
Tapped hole for
injecting/draining grease
(component to be fixed)
Hole for installing
reduction gear
Tapped hole for
injecting/draining grease
(component to be rotated)
Middle flange
Output shaft (shaft)
Input unit
Oil seal on the input side
Tapped hole for
injecting/draining
grease (component
to be rotated)
Tapped hole for handling bolt
Tapped hole for
injecting/draining grease
(component to be fixed)
Oil seal on the
output side
Hole for installing
reduction gear Label
Case
Chapter 2 Product overview
This chapter describes an overview of this product.
2.1. Name of each section
This section provides an explanation of the name of each section.
• If the shape of the actual section differs from the illustration below, refer to the separately provided
“Outer dimensions” drawings and specification sheet.
Type A
Fig. 2-1
Type B
Fig. 2-2
Type C
Fig. 2-3

Chapter 2 Product overview
4
Case Middle flange
Oil seal on the
output side
Output shaft
(shaft)
Input unit
Label
Oil seal on the input side
Oil seal in the
hollow section
Hole for
installing
reduction gear
Tapped hole for
injecting/draining
grease (component
to be fixed)
Tapped hole for
injecting/
draining grease
(component to be
rotated)
Case
Middle flange
Oil seal
Tapped hole for
installing
component
Shaft
Tapped hole for handling bolt
Tapped hole for injecting/draining
grease (component to be fixed)
Motor flange
Input gear
Type D
Fig. 2-4
Type E
Fig. 2-5
Type F
Fig. 2-6
Case
Middle flange
Oil seal
Hollow
section
Tapped hole for
installing component
Tapped hole for
injecting/draining grease
(component to be rotated) Shaft
Hole for installing
reduction gear
Motor flange
Input gear

Chapter 2 Product overview
5
Case
Tapped hole for
installing component
Tapped hole for injecting/draining
grease (component to be rotated)
Shaft
Hole for
installing
reduction gear
Motor flange
Center gear
Hollow
section
Case
Middle flange
Tapped hole for
installing component
Tapped hole for
injecting/draining grease
(component to be rotated)
Shaft Tapped hole for handling bolt
Tapped hole for
injecting/draining grease
(component to be fixed)
Motor flange
Coupling
Hollow
section
Type G
Fig. 2-7
Type H
Fig. 2-8
The shape of the reduction gear may differ from the illustration depending on the ordered
specifications.
Important

Chapter 3 Transportation and storage of product
6
Chapter 3 Transportation and storage of product
This chapter describes the transportation and storage of this product.
3.1. Transportation
• Transport the product in an appropriate manner according to the weights indicated in the separately
provided “Outer dimensions” drawings and specifications.
• If the reduction gear needs to be lifted after unpacking, also refer to “4.4 Lifting of this product”.
• Do not stack the packing boxes containing this product too high.
• Avoid excessive impact or vibration of the reduction gear.
If the packing boxes containing the reduction gear are stacked too high during transportation, they
may collapse and fall down, causing injury or damage to the reduction gear.
Applying excessive impact or vibration to the reduction gear could cause damage to the reduction
gear.
Each weight listed in the separately provided “Outer dimensions” drawings and specification sheet,
indicates the weight of the reduction gear only. It does not include the weight of the packing box or
optional parts, etc.
Note
Important

Chapter 3 Transportation and storage of product
7
3.2. Storage
To avoid rust, corrosion, or deterioration of the sealing material, etc., and collapse of stored packing boxes,
store the product in the following location.
• Location where the ambient temperature is between -10°C to 40°C.
• Location where the humidity is less than 85% and no condensation occurs
• Location that is not directly affected by wind and rain
• Location that is free from combustible/volatile/corrosive gas or dust.
• Stable location that is free from any danger of collapse
• Location with little vibration
When storing the reduction gears, do not stack too many packing boxes. They may collapse and fall
down, causing injury or damage to the reduction gear.
Store the reduction gear under the same conditions as those before unpacking. If it is left upside
down, it could cause damage to the reduction gear.
Although the reduction gear is coated with rust prevention oil before shipping, it is not designed for
long-term storage. If it is stored for a long period, check the condition of the reduction gear
periodically and perform rust prevention treatment as necessary. If rust occurs, it could cause the
leakage of lubricant or premature damage to the reduction gear.
If the reduction gear is used or operated after it has not been used for a long period of time, confirm
that it is free from rust or corrosion and that the sealing material is free from deformation or cracks
beforehand. If the reduction gear is used without checking these points, it could cause the leakage
of lubricant or premature damage to the reduction gear.
Note

Chapter 4 Preparations for installation
8
Chapter 4 Preparations for installation
This chapter describes the preparation for installing this product.
Before designing the equipment, take care regarding the following precautions.
• When the reduction gear is used for human transportation equipment, install an effective safety unit
as a fail-safe mechanism, in case of an unexpected failure in the reduction gear.
• When the reduction gear is used for elevating equipment, install an effective safety unit for
preventing falls caused by idle running as a fail-safe mechanism, in case of an unexpected failure in
the reduction gear.
• Install an oil receiver, etc., to prevent damage in case of lubricant leakage due to a failure or lifetime
expiration.
• As this product may have residual rust prevention agent coated on it before shipping, wipe it off as
necessary.
When the reduction gear is used for human transportation equipment, install an effective safety unit
as a fail-safe mechanism, in case of an unexpected failure in the reduction gear. If you fail to install it,
it could cause injury in case the equipment goes out of control or falls off.
When the reduction gear is used for elevating equipment, install an effective safety unit for
preventing falls caused by idle running as a fail-safe mechanism, in case of an unexpected failure in
the reduction gear. If you fail to install it, it could cause injury in case the elevating unit falls off.
4.1. Installation environment
Use this product under the following environment:
• Location where the ambient temperature is between -10°C to 40°C.
• Location where the humidity is less than 85% and no condensation occurs
• Location where the altitude is less than 1,000 m
• Well-ventilated location
Do not install the reduction gear at the following locations.
• Location where a lot of dust is collected
• Outdoors that can be directly affected by wind and rain
• Location near the environment that contains combustible/explosive/corrosive gases and flammable
materials
• Location where the magnetic fields or vibration occur
If the required installation environment cannot be established/met, contact us in advance.
When using this product under special conditions (clean room, equipment for food, medical
equipment, concentrated alkali, high-pressure steam, etc.), contact our service representative in
advance.
Important

Chapter 4 Preparations for installation
9
4.2. Preparation of required components
• The following components (e.g., bolts) and materials are required for installing this product. The
customer is required to prepare them by referring to the separately provided “Outer dimensions”
drawings and specification sheet.
• If the shape of the actual section differs from the illustration below, refer to the separately provided
“Outer dimensions” drawings and specification sheet.
• Prepare the case installation component and shaft installation component that have been designed and
manufactured based on the separately provided “Outer dimensions” drawings and specification sheet.
For type F (Fig. 2-6), which is structured in such a way that the lubricant cannot be sealed inside,
prepare the shaft installation component that has been designed and manufactured based on the
separately provided “Outer dimensions” drawings, specification sheet, and catalogs for the N and E
series.
The actual components may differ from the required components shown in the above illustration,
depending on the customer’s equipment.
Important
Fig. 4-1 “Example: Type B (Fig. 2-2)”
Serrated lock washer
Hexagon socket head cap screw
Hexagon
socket
head cap screw
Case installation
component
Shaft installation component
Motor
Motor mounting bolt
Serrated lock
washer

Chapter 4 Preparations for installation
10
4.2.1. Installation components
The customer is required to prepare the following components used for incorporating the reduction gear
into the customer’s equipment.
Case installation component
• Prepare the case installation component for the reduction gear.
Confirm that the design of the prepared case installation component conforms to the size and
quantity of the case mounting bolts indicated in the separately provided “Outer dimensions”
drawings and specification sheet.
When preparing the case installation component, take extra care not to cover the tapped holes for
injecting/draining grease. If the tapped holes are covered, it will be difficult to replace the lubricant.
Shaft installation component
• Prepare the shaft installation component for the output shaft of the reduction gear.
• Confirm that the component is structured so that the lubricant can be sealed with an O-ring or liquid
sealant.
• Confirm that the tapped hole for injecting/draining grease is accessible in the shaft installation
component. It will be necessary for replacing the lubricant after installing the reduction gear.
Confirm that the design of the prepared shaft installation component conforms to the size and
quantity of the shaft mounting bolts indicated in the separately provided “Outer dimensions”
drawings and specification sheet.
When preparing the shaft installation component, take extra care not to cover the tapped holes for
injecting/draining grease. If the tapped holes are covered, it will be difficult to replace the lubricant.

Chapter 4 Preparations for installation
11
4.2.2. Reduction gear mounting bolts
• Prepare bolts according to the size and quantity of the case installation bolts and shaft installation
bolts indicated in the separately provided “Outer dimensions” drawings and specification sheet.
• Select the appropriate bolt length based on the mounting dimensions of the components prepared by
the customer and the reduction gear.
• Prepare the following bolts recommended by Nabtesco:
Hexagon socket
head cap screw
JIS B 1176: 2006
Strength class JIS B 1051: 2000 12.9
Thread JIS B 0209: 2001 6 g
4.2.3. Serrated lock washer for hexagon socket head cap screw
Prepare the following serrated lock washer for a hexagon socket head cap screw recommended by
Nabtesco:
Name Belleville spring washer (made by Heiwa Hatsujyo Industry Co., Ltd.)
Corporation
symbol:
CDW-H,
CDW-L (Only for M5)
Material: S50C to S70C
Hardness: HR40 to 48
Table 4-1
(Unit: mm)
Nominal
size
ID and OD of Belleville
spring washer t H
ø d ø D
5 5.25 8.5 0.6 0.85
6 6.4 10 1.0 1.25
8 8.4 13 1.2 1.55
10 10.6 16 1.5 1.9
12 12.6 18 1.8 2.2
14 14.6 21 2.0 2.5
16 16.9 24 2.3 2.8
18 18.9 27 2.6 3.15
20 20.9 30 2.8 3.55
When using any equivalent washer, select it with special care given to its outside diameter (øD).
Important
Fig. 4-2
Assemble the bolt so that the
bolt head faces this side

Chapter 4 Preparations for installation
12
4.2.4. O-ring
If the reduction gear is shaped in a way that its shaft side is not hermetically sealed (refer to Fig. 2-6), it is
necessary to seal the shaft mounting surface. Use the O-rings indicated in the separately provided “Outer
dimensions” drawings and specification sheet. If there is no indication, select the size of the O-ring
appropriate for the surface to be sealed. If an O-ring cannot be used due to the structure, seal the section
using a liquid sealant, etc.
If it is difficult to purchase any of the O-rings described in the “Outer dimensions” drawings and
specification sheet, select an O-ring based on the design standard of each manufacturer by
referring to the dimensions listed above. Failure to do so could cause the leakage of lubricant.
4.2.5. Liquid sealant
When sealing the shaft mounting surface of the reduction gear and shaft installation component using
liquid sealants, prepare the following liquid sealants recommended by Nabtesco.
Table 4-2
Name Manufacturer Characteristics and applications
ThreeBond 1211 ThreeBond • Silicone-based, solventless type
• Semi-dry gasket
HermeSeal SS-60F Nihon Hermetics Co.
• One-part, non-solvent elastic sealant
• Metal contact surface (flange surface) seal
• Any product basically equivalent to
ThreeBond 1211
Loctite 515 Henkel • Anaerobic flange sealant
• Metal contact surface (flange surface) seal
Do not use the above liquid sealants if the component of the customer’s device is made of copper or
copper alloy.
Note
Note