NWM
NWS
Operating Manual
Worm Gear Reducers
Contents
1 Preface ..................................................................................................................................................... 3
2 Safety Notes .............................................................................................................................................. 3
3 Transportation ...........................................................................................................................................3
4 Installation ................................................................................................................................................3
4.1 Installation Notes .................................................................................................................................. 3
4.2.1 Kuma Series Mounting Position ......................................................................................................... 4
5 Usage ....................................................................................................................................................... 5
6 Care and Maintenance ................................................................................................................................. 5
6.1 Routine Maintenance ............................................................................................................................. 5
6.2 Lubricants ............................................................................................................................................ 5
6.3 Malfunctions ........................................................................................................................................ 6
Appendix ................................................................................................................................................. 6-7
1 Preface
The enclosed instructions review the transportation, storage, assembly, usage and maintenance of Kuma worm speed reducers, etc.
2 Safety Notes
• Please read the instructions carefully before operation of the gearbox and present the instructions to the user for proper usage and care.
• Following the instructions in the manual is a prerequisite for the trouble-free operation and long operating life, which also helps avoid
personnel injury and property loss.
• Whenever the worm gear reducer has any abnormal phenomena (like temperature increasing, noise level, vibration in an improper level)
during the operation, please urgently stop the reducer and check the cause. The machine should stop operation until the cause is determined and the conditions are eliminated. Please consult our service department if you have any questions.
3 Transportation
• Once you received the shipment, please inspect items. In case any damage occurred, please don’t use the product and inform the trans-
port company immediately.
• Before mounting the reducers, please tighten the eyebolt which is selected according to the weight of reducers and can’t bear additional
weight. If there is additional load, please select proper device to move the reducer.
• Please remove all transportation xtures prior to startup of reducers.
4 Installation
4.1 Installation Notes
• Check if the data on nameplate conforms to the operating requirement on site.
- Environment requirements for standard speed reducer:
- Ambient temperature:-10°C---40°C
- No oil, acid, smoke, noxious gas and radiation.
• Check the mounting position, the rotation direction and the shaft direction are correct.
• The base-plate must be at and secure, and the base-bolts must be screwed down and shockproof.
• The shafts of prime mover, reducer and operation device must be coaxial after installation.
• The diameter tolerance of input and output shaft is h6. The bolt hole (such as couplings, belt-pulley, sprocket wheel and so on) must
properly mate with the shaft, and this prevents the bearing from breakage due to being over-tightened and avoids poor power transmission due to a loose connection.
Installation Tolerances(as follows)
Shaft End Flange
Diameter tolerance
• ISO h6 (ISO h6 for solid shafts)
• ISO E8 (ISO E8 for input hollow shafts)
• ISO F8 (ISOE8 ISO E8 for output hollow shafts)
• The input, output shafts, and anges receive an anti-corrosion coating before shipping. Please clean the output shafts
and ange surfaces thoroughly to ensure they are free from anti corrosion agents, contamination or grease using a
commercially available solvent. Do not let the solvent come into contact with the seals in order to prevent damage to the
material.
Register diameter shoulder tolerance
• ISO F7
• Be sure that worm reducer had been lled with lubricant according to the following provisions before startup:
- Kuma series worm reducers are lled with lubricant in our factory. Please check if the oil level conform to the speci cation prior to running for the model Kuma 110 to 150 frame. In case of any deviation for the oil level, please adjust to the
proper oil level. For lubricants and capacity, Please refer to the appendix” table 5 and table 8”.
• Drives such as sprocket wheel and gear must be tted closely to the bearing in order to reduce bending stress of a no o set load. Please refer to chart 1:
Worm Gear Reducers
BA
Chart 1
NOTE:
STOP
• Never use hammer to hit the belt pulleys, couplings, pinions, etc. onto the shaft end. It will damage the bearing,
housing and the shaft.
• It may be easier to assemble, if you rst apply lubricant to the output element or heat it up brie y ( to 80 —100° C )
• In the case of belt pulleys, make sure that the belt is tensioned correctly in accordance with the
manufacturer’s instructions.
• Power transmission elements should be balanced after tting to prevent excessive radial and axial forces.
• While mounting the motor to the reducer with the motor adapter or mounting the shaft into hollow bore it is necessary that a proper amount of lubricant is applied to the worm shaft input hole, motor shaft, driving hollow shaft and
driven shaft.
• For ange mount con guration, ange should be assembled correctly to avoid distortions.
• For torque arm mounting, the driving hollow shaft and the driven shaft should be tted correctly. The torque arm
should be xed and locked tightly.
• When a sprocket, sheave, pulley or gear is attached to the output shaft, mount the hub away from the body of the
reducer to avoid excessive overhung load. See Figure B in chart 1.
4.2 Mounting Position
4.2.1 Kuma Series Mounting Position
Chart 2
5 Usage
• Don’t drive the reducer with large excessive moments of inertia which could exert a large back driving load on the worm reducer.
• Before use, please check and make sure that the reducer center of distance, ratio, shaft connections, output shaft structure, input
and output shaft direction and rotating direction are correct according to requirements. Input speeds of the worm shaft should be
less than 2000 rpm. The general speeds range is 600-1800 rpm.
• Make sure that worm reducer has the proper amount of lubricant before startup.
• The load should be added incrementally when using the machine. Never run it with full load at start-up.
• When the ambient temperature is 5°C above or below the normal level stated in the table, please contact us.
• When abnormal circumstances occur, please stop and check the reducer against the ”Malfunctions” table 3. (Allowable maximum
operation oil temperature is 95°C.
• Please active the air vent or the breather valve as following steps before startup.
a) Activating an air vent with cone plug
1. Air vent with cone plug before starting operation
1. 2.
2. Remove the cone plug when starting operation
Chart 4
b) Activating the breather valve
1. Breather valve with xture before
starting operation
2. Remove the xture from the breather valve
when starting operation while working
Chart 5
• Worm reducers require a run-in period of at least 24 hours before reaching its maximum e ciency. If normal operation requires,
gearbox to rotate in both directions, each direction needs to separately rotate for some time.
6 Check and Maintenance
6.1 Maintenance Intervals
Cycle of check Content
After the rst 500 hours (Kuma 110-150 frame). clean housing and change oil
After 5000 hours of operation.
Kuma frame sizes 025-090 have been lled with lubrication. User doesn’t need to add oil. After about 10000 hours if operation, please change lubricant.
Table 2
clean housing and change oil
Replace anti-friction bearings and oil seal.
6.2 Lubricants
• Please change the oil when the oil is warm.
• Helpful and safe tips: Shut down the power to prevent personnel injury! Allow the until to cool by touch so it doesn’t feel
hot by the gearbox.
• The gearbox must still be warm otherwise the high viscosity of excessively cold oil will make it hard to drain the oil.
1. Place a container underneath the oil drain plug.
2. Remove vent plug on breather valve and cone plug.
3. Drain all of the oil and clean the inside, then re-screw oil drain plug.
4. Pour in new oil of the some type through the vent hole. Do not mix synthetic lubricants.
• The worm reducer must still be warm otherwise the high viscosity of excessively cold oil will make it hard to ll with oil.
- Pour in the volume of oil in accordance with the lubricant capacity table.
- Screw the breather plug back into place, and check readings at the oil level plug.
Worm Gear Reducers
6.3 Malfunctions
Malfunctions Causes Solutions
Improper connection between prime mover, reducer and the operation device Adjust to proper position and connection
Overloading Adjust to proper load
Overheating
Vibration
Noise
Oil leakage
Tooth surface of
worm gear sets wear
quickly
Over friction of seals Reduce lubricant at oil seal
Lubricant over lled or shortage Adjust to proper oil level as recommended
Oil contamination or inferior oil Replace with new oil
Prime mover, reducer and the operation device mounted poorly Find loose connection and tighten
Tooth surface of worm gear is worn-out or damaged Replace worm gear sets (We will cooperate with you when necessary)
Bearing worn-out Replace bearing
Bolt loose Tighten screw
Bearing damaged or too large of a clearance Replace bearing
Worm gear sets mesh poorly Mend tooth surface or replace worm gear sets(Please contact to us)
Lubricant shortage Fill with correct amount of oil
Foreign object in box Drain all the oil in order to remove foreign object and re ll with clean oil
Oil seal lip worn-out Replace oil seal
Shaft of oil seal worn-out Replace input or output shaft
Too much oil Drain oil to correct level
Oil screw plug loose Tighten oil screw plug
Oil gauge damaged Replace oil gauge
Over load Adjust to proper loading
Lubricant not correct Replace proper lubricant
Lubricant shortage Fill with additional oil to the correct level
Did not replace lubricant in time, oil deteriorated Replace oil according to maintenance schedule
Overheating while running 1. Refer to "Overheating" 2. Increase air ow around reducer
Table 3
NOTE: Short-term oil/grease leakage at the oil seal is possible in the run-in phase(24 hours running time).
Lubricant capacity of Kuma series (L)
Installation Type 025 030 040 050 063 075 090 110 130 150
B3
B6 B7 2.5 3.5 5.4
B8 2.2 3.3 5.1
V5 3 4.5 7
V6 2.2 3.3 5.1
0.02 0.04 0.08 0.15 0.3 0.55 1
Table 4
3 4.5 7
NOTE:
* The speci ed ll quantities are recommended values. The precise values could vary with the number of stages and reducer
ratio. When lling, it is essential to check the oil level plug since it indicates the precise oil capacity.
Selecting lubricant of Kuma series
Reducer size 25-90 110-150
Type of lubrication oil
Ambienttemperaturer -25-+50 -5 - +40 -5-+40
ISO VG
AGIP
SHELL
ESSO
MOBIL
CASTROL
BP
Synthetic lubrication oil Mineral lubrication oil
ISO VG 320 ISO VG 460 ISO VG 220
TELIUM VSF320 BLASIA 460 BLASIA 220
TIVELA OIL SC320 OMALA OIL 460 OMALA OIL 220
S220 SPARTAN EP460 SPARTAN EP220
GLYGOYLE 30 MOBIL GEAR 634 MOBIL GEAR 630
ALPHASYN PG320 ALPHA MAX 460 ALPHA MAX 220
ENERGOL SG-XP320 ENERGOL GR-XP460 ENERGOL GR-XP220
Table 5
NIDEC MOTOR CANADA CORPORATION
6617 Thimens Blvd
St-Laurent, QC – H4S 1W2, Canada
Phone: (800) 361-5509 - (514) 332-1880
752 Cochran Dr. Unit 2
Markham, ON, L3R 8E1, Canada
Phone: (800) 268-7913 - (905) 479-3219
www.drives.nidec-shimpo.com
Loading...