Product Description

 

Product Description

MAIN FEATURES:
1) Made of high quality material,  non-rusting;Both flange and foot mounting available and suitable for all-round installation
2) Large output torque and high radiating efficiency
3)Precise grinding helical gear with Smooth running and low noise, no deformation,can work long time in dreadful condition
4)Nice appearance, durable service life and small volume, compact structure
5)Both 2 and 3 stage available with wide ratio range from 5 to 200
6)Different output shaft diameter available -40-50mm
7)Modular construction enlarge ratio from 5 to 1400

MAIN MATERIALS:
1)housing with aluminium alloyand cast iron material;
2)Output Shaft Material:20CrMnTi
3)Good quality no noise bearings to keep long service life
4)High performance oil seal to prevent from oil leakage

APPLICATIONS:
G3 Series helical gear motor are wide used for all kinds of automatic equipment, such as chip removal machine, conveyor, packaging equipment, woodworking machinery, farming equipment, slurry scraper ,dryer, mixer and so on.

Detailed Photos

Product Parameters

 

(n1=1400r/min  50hz)
norminal ratio 5 10 15 20 25 30 40 50 60 80 100 100 120 160   200   
0.1kw output shaft  Ø18 Ø22
n2* (r/min) 282 138 92 70 56 46 35 28 23 18 14 11 9 7
M2(Nm) 50hz 3.2 6.5 9.8 12.9 16.1 19.6 25.7 31.1 37.5 49.5 62.9 76.1 100.7 125.4
60hz 3 5 8 11 13 17 21 26 31 41 52 63 84 105
Fr1(N) 588 882 980 1180 1270 1370 1470 1570 2160 2450 2450 2450 2450 2450 2450
Fr2(N) 176
norminal ratio 5 10 15 20 25 30 40 50 60 80 100 100 120 160 200
0.2kw output shaft  Ø18 Ø22 Ø28
n2* (r/min) 282 138 92 70 56 45 35 29 23 18 14 13 12 8 7
M2(Nm) 50hz 6.5 12.6 19.1 26.3 32.6 38.9 50.4 63 75.6 100.8 103.9 125.4 150 200.4 250.7
60hz 5.4 10.5 16.6 21.9 27.1 32.4 42 52.5 63 84 86.6 104.5 125 167 208.9
Fr1(N) 588 882 980 1180 1270 1760 1860 1960 2160 2450 2450 2840 3330 3430 3430
Fr2(N) 196
norminal ratio 5 10 15 20 25 30 40 50 60 80 100 100 120 160 200
0.4kw output shaft  Ø22 Ø28 Ø32
n2* (r/min) 288 144 92 72 58 47 36 29 24 18 14 14 12 9 7
M2(Nm) 50hz 12.9 25 38.6 51.4 65.4 78.2 100.7 125.4 150 200.4 206.8 250.7 301.1 400.7 461.8
60hz 10.7 20.8 32.1 42.9 54.5 65.2 83.9 104.5 125 167 172.3 208.9 250.9 333.9 384.8
Fr1(N) 882 1180 1370 1470 1670 2550 2840 3140 3430 3430 3430 4900 5880 5880 5880
Fr2(N) 245
norminal ratio 5 10 15 20 25 30 40 50 60 80 100 100 120 160 200
0.75kw output shaft  Ø28 Ø32 Ø40
n2* (r/min) 278 140 94 69 58 46 35 29 24 18 14 14 11 9 7
M2(Nm) 50hz 24.6 48.2 72.9 97.5 122.1 145.7 187.5 235.7 282.9 376.1 387.9 439 527 703 764
60hz 20.5 40.2 60.7 81.3 201.8 121.4 156.3 196.4 235.7 313.4 323.2 366 439 585 732
Fr1(N) 1270 1760 2160 2350 2450 4571 4210 4610 5490 5880 5880 7060 7060 7060 7060
Fr2(N) 294
norminal ratio 5 10 15 20 25 30 40 50 60 80 100 100 120 160 200
1.5kw output shaft  Ø32 Ø40 Ø50
n2* (r/min) 280 140 93 70 55 47 34 27 24 17 14 13 12 8 7
M2(Nm) 50hz 48.2 97.5 145.7 193.9 242.1 272 351 439 527 703 724 878 1060 1230 1230
60hz 40.2 81.3 121.4 161.6 201.8 226 293 366 439 585 603 732 878 1170 1230
Fr1(N) 1760 2450 2840 3230 3820 5100 5880 7060 7060 7060 7060 9800 9800 9800 9800
Fr2(N) 343
norminal ratio 5 10 15 20 25 30 40 50 60 80 100        
2.2kw output shaft  Ø40 Ø50  
n2* (r/min) 272 136 95 68 54 45 36 28 24 18 14        
M2(Nm) 50hz 67 133 200 266 332 399 515 644 773 1571 1230        
60hz 56 111 167 221 277 332 429 537 644 858 1080        
Fr1(N) 2160 3140 3530 4571 4700 6960 7250 8620 9800 9800 9800        
Fr2(N) 392

Outline and mounting dimension:

G3FM: THREE PHASE GEAR MOTOR WITH FLANGE                                                                                       (n1=1400r/min)
Power kw output shaft ratio A F I J M O O1 P Q R S T U W X Y Y1
standard brake
0.1kw  Ø18 5–30-40-50 236 270 192.5 11 16.5 170 4 10 30 145 35 18 20.5 129 6 157 80 81
 Ø22 -160-200 262 296 197.5 11 19 185 4 12 40 148 47 22 24.5 129 6 171.5 89.5 83.5
0.2kw  Ø18 5- 267 270 192.5 11 16.5 170 4 10 30 145 35 18 20.5 129 6 161 80 81
 Ø22 -80-100 293 296 197.5 11 19 185 4 12 40 148 47 22 24.5 129 6 171.5 89.5 83.5
 Ø28 306 309.5 208.5 11 23.5 215 4 15 45 170 50 28 31 129 8 198.5 105.5 88
0.4kw  Ø22 5- 314 324.5 204 11 19 185 4 12 40 148 47 22 24.5 139 6 171.5 89.5 88.5
 Ø28 -80-100 330 337.5 215 11 23.5 215 4 15 45 170 50 28 31 139 8 198.5 105.5 93
 Ø32 349 357 229.5 13 28.5 250 4 15 55 180 60 32 35 139 10 234 126 98
0.75kw  Ø28 5- 350.5 343.5 227.5 11 23.5 215 4 15 45 170 50 28 31 159 8 198.5 105.5 103
 Ø32 -80-100 379.5 387 242 13 28.5 250 4 15 55 180 60 32 35 159 10 234 126 108
 Ø40 401.5 408.5 270 18 34 310 5 18 65 230 71 40 43 185 12 284 149 126.5
1.5kw  Ø32 5- 420.5 441 254 13 28.5 250 5 15 55 180 60 32 35 185 10 234 126 121
 Ø40 -80-100 457.5 478 270 18 34 310 5 18 65 230 71 40 43 185 12 284 149 126.5
 Ø50 485.5 506 300 22 40 360 5 25 75 270 83 50 53.5 185 14 325 173.5 132.5
2.2kw  Ø40 5- 466.5 487 270 18 34 310 5 18 65 230 71 40 43 185 12 284 149 126.5
 Ø50 -80-100 510.5 531 300 22 40 360 5 25 75 270 83 50 53.5 185 14 325 173.5 132.5


 

G3LM: THREE PHASE GEAR MOTOR WITH FOOT                                                                                                               (n1=1400r/min)
Power kw output shaft ratio A D E F J G H K P S T   U  V W   X  Y   Y1       
standard brake
0.1kw  Ø18 5–30-40-50 236 270 40 110 135 16.5 65 9 45 30 18 20.5 129 183 6 133 85 10
 Ø22 -160-200 262 296 65 130 155 19 90 11 55 40 22 24.5 129 193 6 139.5 90 12
0.2kw  Ø18 5- 267 270 40 110 135 16.5 65 9 45 30 18 20.5 129 183 6 133 85 10
 Ø22 -80-100 293 296 65 130 155 19 90 11 55 40 22 24.5 129 193 6 139.5 90 12
 Ø28 306 309.5 90 140 175 23.5 125 11 65 45 28 31 129 203 8 170 110 15
0.4kw  Ø22 5- 314 324.5 65 130 155 19 90 11 55 40 22 24.5 139 199.5 6 141.5 90 12
 Ø28 -80-100 330 337.5 90 140 175 23.5 125 11 65 45 28 31 139 210 8 170 110 15
 Ø32 349 357 130 170 208 28.5 170 13 70 55 32 35 139 226 10 198 130 18
0.75kw  Ø28 5- 350.5 343.5 90 140 175 23.5 125 11 65 45 28 31 159 222 8 170 110 15
 Ø32 -80-100 379.5 387 130 170 208 28.5 170 13 70 55 32 35 159 238.5 10 198 130 18
 Ø40 401.5 408.5 150 210 254 34 196 15 90 65 40 43 185 249 12 230 150 20
1.5kw  Ø32 5- 420.5 441 130 170 208 28.5 170 13 70 55 32 35 185 250.5 10 198 130 18
 Ø40 -80-100 457.5 478 150 210 254 34 196 15 90 65 40 43 185 260 12 230 150 20
 Ø50 485.5 506 160 230 290 40 210 18 100 75 50 53.5 185 288 14 265 170 25
2.2kw  Ø40 5- 466.5 487 150 210 254 34 196 15 90 65 40 43 185 260 12 230 150 20
 Ø50 -80-100 510.5 531 160 230 290 40 210 18 100 75 50 53.5 185 288 14 265 170 25


 

G3FS: IEC GEAR REDUCER WITH FOOT                                                                                                                           (n1=1400r/min)
Power kw output shaft ratio A B C F I J L M N O O1 P Q R S S1 T T1 W W1 X Y Y1
0.12kw  Ø18 5–30-40-50 147 95 115 154 11 16.5 4.5 170 140 4 10 30 145 35 18 11 20.5 12.8 6 4 163 80 86.5
 Ø22 -160-200 173 95 115 164 11 19 4.5 185 140 4 12 40 148 47 22 11 24.5 12.8 6 4 171.5 89.5 89
0.18kw  Ø18 5- 147 95 115 154 11 16.5 4.5 170 140 4 10 30 145 35 18 11 20.5 12.8 6 4 163 80 86.5
 Ø22 -80-100 173 95 115 164 11 19 4.5 185 140 4 12 40 148 47 22 11 24.5 12.8 6 4 171.5 89.5 89
 Ø28 186.5 95 115 186 11 23.5 4.5 215 140 4 15 45 170 50 28 11 31 12.8 8 4 198.5 105.5 93.5
0.37kw  Ø22 5- 181.5 110 130 164 11 19 4.5 185 160 4 12 40 148 47 22 14 24.5 16.3 6 5 201 89.5 99
 Ø28 -80-100 198 110 130 186 11 23.5 4.5 215 160 4 15 45 170 50 28 14 31 16.3 8 5 198.5 105.5 103.5
 Ø32 216.5 110 130 215 13 28.5 4.5 250 160 4 15 55 180 60 32 14 35 16.3 10 5 234 126 108.5
0.75kw  Ø28 5- 206.5 130 165 185 11 23.5 4.5 215 200 4 15 45 170 50 28 19 31 21.8 8 6 216.5 105.5 123.5
 Ø32 -80-100 235 130 165 215 13 28.5 4.5 250 200 4 15 55 180 60 32 19 35 21.8 10 6 236.5 126 128.5
 Ø40 260.5 130 165 270 18 34 4.5 310 200 5 18 65 230 71 40 19 43 21.8 12 8 284 149 134
1.5kw  Ø32 5- 252 130 165 215 13 28.5 4.5 250 200 5 15 55 180 60 32 24 35 27.3 10 8 236.5 126 128.5
 Ø40 -80-100 293.5 130 165 270 18 34 4.5 310 200 5 18 65 230 71 40 24 43 27.3 12 8 284 149 134
 Ø50 321.5 130 165 300 22 40 4.5 360 200 5 25 75 270 83 50 24 53.5 27.3 14 8 323.5 173.5 140
2.2kw  Ø40 5- 290 180 215 270 18 34 5.5 310 250 5 18 65 230 71 40 28 43 31.3 12 8 284 149 134
 Ø50 -80-100 334 180 215 300 22 40 5.5 360 250 5 25 75 270 83 50 28 53.5 31.3 14 8 323.5 173.5 140


 

G3LS: IEC GEAR REDUCER WITH FOOT                                                                                                                           (n1=1400r/min)  
Power kw output shaft ratio A B C D E F G H J K L N P S S1 T T1 W W1 X Y Y1 Z
0.12kw  Ø18 5–30-40-50 147 95 115 40 110 135 65 9 16.5 45 4.5 140 30 18 11 20.5 12.8 6 4 138.5 85 10 M8
 Ø22 -160-200 173 95 115 65 130 154 90 11 19 55 4.5 140 40 22 11 24.5 12.8 6 4 141 90 12 M8
0.18kw  Ø18 5- 147 95 115 40 110 135 65 9 16.5 45 4.5 140 30 18 11 20.5 12.8 6 4 138.5 85 10 M8
 Ø22 -80-100 173 95 115 65 130 154 90 11 19 55 4.5 140 40 22 11 24.5 12.8 6 4 141 90 12 M8
 Ø28 186.5 95 115 90 140 175 125 11 23.5 65 4.5 140 45 28 11 31 12.8 8 4 170 110 15 M8
0.37kw  Ø22 5- 181.5 110 130 65 130 154 90 11 19 55 4.5 160 40 22 14 24.5 16.3 6 5 151 90 12 M8
 Ø28 -80-100 198 110 130 90 140 175 125 11 23.5 65 4.5 160 45 28 14 31 16.3 8 5 170 110 15 M8
 Ø32 216.5 110 130 130 170 208 170 13 28.5 70 4.5 160 55 32 14 35 16.3 10 5 198 130 18 M8
0.75kw  Ø28 5- 206.5 130 165 90 140 175 125 11 23.5 65 4.5 200 45 28 19 31 21.8 8 6 186.5 110 15 M10
 Ø32 -80-100 235 130 165 130 170 208 170 13 28.5 70 4.5 200 55 32 19 35 21.8 10 6 201.5 130 18 M10
 Ø40 260.5 130 165 150 210 254 196 15 34 90 4.5 200 65 40 19 43 21.8 12 8 230 150 20 M10
1.5kw  Ø32 5- 252 130 165 130 170 208 170 13 28.5 70 4.5 200 55 32 24 35 27.3 10 8 201.5 130 18 M10
 Ø40 -80-100 293.5 130 165 150 210 254 196 15 34 90 4.5 200 65 40 24 43 27.3 12 8 230 150 20 M10
 Ø50 321.5 130 165 160 230 290 210 18 40 100 4.5 200 75 50 24 53.5 27.3 14 8 265 170 25 M10
2.2kw  Ø40 5- 290 180 215 150 210 254 196 15 34 90 5.5 250 65 40 28 43 31.3 12 8 230 150 20 M12
 Ø50 -80-100 334 180 215 160 230 290 210 18 40 100 5.5 250 75 50 28 53.5 31.3 14 8 265 170 25 M12

Company Profile

We are a professional reducer manufacturer located in HangZhou, ZHangZhoug province.Our leading products is  full range of RV571-150 worm reducers , also supplied GKM hypoid helical gearbox, GRC inline helical gearbox, PC units, UDL Variators and AC Motors, G3 helical gear motor.Products are widely used for applications such as: foodstuffs, ceramics, packing, chemicals, pharmacy, plastics, paper-making, construction machinery, metallurgic mine, environmental protection engineering, and all kinds of automatic lines, and assembly lines.With fast delivery, superior after-sales service, advanced producing facility, our products sell well  both at home and abroad. We have exported our reducers to Southeast Asia, Eastern Europe and the Middle East and so on.Our aim is to develop and innovate on the basis of high quality, and create a good reputation for reducers.

Workshop:

 

Exhibition

ZheJiang PTC Fair:

Packaging & Shipping

After Sales Service

1.Maintenance Time and Warranty:Within 1 year after receiving goods.
2.Other ServiceIncluding modeling selection guide, installation guide, and problem resolution guide, etc

FAQ

1.Q:Can you make as per customer drawing?
A: Yes, we offer customized service for customers accordingly. We can use customer’s nameplate for gearboxes.
2.Q:What is your terms of payment ?
A: 30% deposit before production,balance T/T before delivery.
3.Q:Are you a trading company or manufacturer?
A:We are a manufacurer with advanced equipment and experienced workers.
4.Q:What’s your production capacity?
A:4000-5000 PCS/MONTH
5.Q:Free sample is available or not?
A:Yes, we can supply free sample if customer agree to pay for the courier cost
6.Q:Do you have any certificate?
A:Yes, we have CE certificate and SGS certificate report.

Contact information:
Ms Lingel Pan
For any questions just feel free ton contact me. Many thanks for your kind attention to our company!

Application: Motor, Machinery, Marine, Agricultural Machinery, Power Transmission Applications
Function: Distribution Power, Clutch, Change Drive Torque, Change Drive Direction, Speed Changing, Speed Reduction
Layout: Coaxial
Hardness: Hardened Tooth Surface
Installation: Vertical or Horizontal Type
Step: Two Stage- Three Stage
Samples:
US$ 35/Piece
1 Piece(Min.Order)

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Request Sample

Customization:
Available

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worm reducer

Is a worm gear reducer gearbox right for your application?

If you’re interested in gear reduction and wondering if a worm gear reducer gearbox is right for your application, you’ve come to the right place. This gear reducer gearbox is efficient and compact. In addition, it has small clearances and is easy to install. Let’s take a closer look.

This is a reducer gearbox

Worm reducer gearbox is a type of reduction gear used in machinery. This gear reduces the output speed by changing the ratio of input to output. Gears come in a wide range of sizes and can be made from a variety of materials, including aluminum, cast iron, and stainless steel. Its efficiency depends on the ratio and size of the gears. It is usually used in low speed applications. But it can also be used as an auxiliary braking device for high-speed moving machinery.
When choosing a reduction gear, it’s important to look for models with multiple teeth. Ideally, it will have more teeth than the corresponding sprocket. This will reduce the noise produced by the gears. The maximum number of teeth of the worm gear should be greater than 40.
Worm gears produce less noise and vibration than conventional gears. Also, they are cheaper and smaller than other types of reduction gears. However, worm gears have some limitations that make them less efficient than other types. For example, they do not perform as efficiently as parallel or orthogonal axes, which are much better at transmitting power.
The main disadvantage of worm gears is the difficulty of lubrication. Worm gear reducer gearboxes require more lubrication due to the helical motion of the gears. This means it is less efficient and more prone to wear than a standard gearbox. Helical motion has problems transmitting power and causes sliding friction, also known as sliding wear.
A worm reducer gearbox is a reduction gearbox used to decelerate a high-speed motor to a low-speed output. Worm gear reducer gearboxes produce lower output speeds while maintaining high torque. Its gears are made of bronze or stainless steel and have a right-angle output. The gears are very small compared to other reducer gearboxes, so they can be used in tight spaces and applications where space is limited.

pocket

Worm gear reducer gearboxes are an excellent choice for applications requiring high torque and low speeds. These reducer gearboxes are compact, durable and have a long service life. These gearboxes are also compatible with solid and hollow output shafts. This feature eliminates the need for chains or belts, reducing the number of moving parts. Plus, they’re easy to maintain, which means they’re an excellent choice for a variety of applications.
Worm gear reducer gearboxes are also compact, versatile and easy to install. The worm gear itself is made from a single piece of alloy steel. It has a high helix angle and is case hardened and ground for durability. Its six AF hex sockets are designed for easy installation and a wide range of ratios. Worm gear reducer gearboxes are also suitable for manual operation. They are easy to install, compact in design and compatible with a wide range of motors and drives.
Worm reducer gearboxes are often used in industrial settings where a small amount of torque is required to move large objects. They are also useful when space is at a premium. They are compact and easy to install in tight spaces. Worm gears reduce the risk of tripping and are often made of durable materials, making them a popular choice.
Compared with planetary gearboxes, worm gear reducer gearboxes have many advantages. They are quiet, produce less noise, and are more comfortable to use. They are also more energy efficient than their planetary counterparts. Furthermore, they can be combined with other gearboxes and trains to increase their output efficiency.
worm reducer

It is high efficiency

When a worm reducer gearbox is used in a gear-motor, it is critical to note that it is extremely high in efficiency. This type of reducer gearbox is typically much hotter than a hypoid reducer gearbox, which reduces the service life of the gear. The increased thermal stress on the sliding gears results in premature seal wear and leakage. Furthermore, excessive heat causes lubrication to break down and can cause contamination. Helical gear reducer gearboxes are significantly cooler and have a low-maintenance design. Consequently, they can reduce factory downtime and energy costs.
A servo-worm reducer gearbox is an excellent choice for applications requiring high performance, repeatability, and precision positioning. These gear reducer gearboxes have been specifically designed for use with servo motor technology, which provides tight integration of the gear motor. Other advantages of a servo-worm reducer gearbox include reduced angular backlash and longer life.
Hypoid gearmotors offer increased efficiency and allow smaller motors to be used. A 1 HP worm reducer gearbox can produce the same amount of output as a 1/2 HP hypoid reducer gearbox. A Agknx study compared the two types of reducer gearboxes, comparing power, torque, and efficiency. As a result, a 1/2 HP hypoid gearmotor is much cheaper to operate than a 1 HP worm reducer gearbox.
The efficiency of a worm gear reducer gearbox depends on many factors, including the mesh of the gears and losses in the bearings and oil seal lips. The speed and load of the reducer gearbox also have an impact on its efficiency. As a result, worm gear reducer gearboxes should be used with the right type of lubricant.
In a worm gear reducer gearbox, a non-intersecting shaft rotates against a gear, while the output worm gear rotates in a perpendicular direction. This arrangement produces high efficiency while reducing the noise and vibration of the gear motor. This gear reducer gearbox is also quiet and has a low friction coefficient.

It has a low clearance

Worm reducer gearboxes are typically designed with a low clearance, meaning that the worm is not allowed to touch the wheels in the gear arrangement. The lubricant used depends on the size of the gearing, and it is usually ISO 680 or ISO 460. Higher viscosities require special equipment.
Worm gears are popular in machines that need to stop quickly, such as lifts and elevators. The gears and worm are made of a soft material, minimizing backlash and failure rates. They are also popular in heavy-duty machines, such as rock crushers. But while this is an important aspect of their design, there are other factors to consider when choosing a worm gear.
Worm gears have multiple teeth, which allows for greater surface area contact and a better distribution of load. This feature allows for high transmission ratios without sacrificing power. Worm gears can be paired with other gearboxes to increase the overall efficiency of the system.
Worm gears are often used in heavy machinery, including trucks barreling down a deserted highway. They can also be found in packaging machinery, conveyors, and other small machinery. Their unique shape makes them ideal for tight spaces. But they also tend to wear and tear much faster than conventional gears.
worm reducer

It has a high torque to weight ratio

The worm gear reducer gearbox is a versatile gear train that provides a high torque-to-weight ratio. These reducer gearboxes are typically used in applications that require high torque and high gear ratios, such as machine tools. They also have a very compact design, enabling very high gear ratios at low speeds.
Worm gear reducer gearboxes are very quiet, mainly because the input and output shafts are perpendicular to each other. Their low noise level is an advantage compared to planetary gearboxes. Compared with planetary reducer gearboxes, worm gear reducer gearboxes are also relatively cheap.
The worm gear consists of two parts: the helical butt-jointed worm gear and the worm. The screw-butted worm gear is connected to the shaft by a helical thread. The worm gear is a variation of the six-simple machine. The worm is located in the worm wheel, which forces the worm to rotate. It also changes the plane of motion. Worm gears are usually made of steel or brass.
Worm gear reducer gearboxes are one of the most popular types of reducer gearboxes. It provides high torque and high speed ratio in a compact package. These reducer gearboxes are used in many power transmission systems, including elevators, safety gates, conveyor belts, and medical testing equipment.
Worm reducer gearboxes come in a variety of shapes and sizes, including parallel shaft reducer gearboxes and planetary worm reducer gearboxes. They have a high torque-to-weight ratio and are easy to maintain. They are also lightweight and relatively easy to install. This makes them an excellent choice for many applications.
Worms can be assembled using stepped shafts, set screws or dowel pins. However, the worm is subject to a lot of thrust and must be held firmly. This could lead to a rebound. Also, the bearings may come loose and the worm may move. To avoid backlash, make sure the worm gear shaft passes through the midpoint of the worm face width.

China manufacturer CE Approval Inline Helical Gearbox for Electric Motors   combined worm gearboxChina manufacturer CE Approval Inline Helical Gearbox for Electric Motors   combined worm gearbox
editor by CX 2023-05-25

Brass Worm Gear

As one of the brass worm gear manufacturers, suppliers, and exporters of mechanical products, We offer brass worm gears and many others.

Please get in touch with us for details.

Manufacturer supplier exporter of brass worm gear.

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