Tag Archives: stepper gear motor

China Standard FECO gearbox KTSR90 series Helical gear small right angle planetary gearbox for stepper motor robot synchromesh gearbox

Warranty: 1 yr, eighteen Months
Applicable Industries: Developing Content Retailers, Manufacturing Plant, Machinery Mend Stores, Food & Beverage Manufacturing unit, Farms, Retail, Printing Retailers, Construction works , Power & Mining, Advertising Organization
Bodyweight (KG): 12
Customized help: OEM
Gearing Arrangement: Planetary
Output Torque: 116NM
Enter Pace: 3000RPM
Output Speed: 150RPM
Efficiendy: L1≥97
Protection Class: IP65
Life time: ≥20000 Several hours
Running temprature: -10℃-+90℃
Lubrication: Life span Lubrication
Mounting position: All placement
Noise: ≤60 DB
Shade: Customer Requirement
Ratio: twenty
Packaging Details: 1pc/carton box or in accordance to customer ask for
Port: ZheJiang or HangZhou port

Planetary Gearbox
Efficiency>=97%
Housing substanceSCM415
Gear materialsSCM415
Floor hardness of gears60±2HRC
Input / Output shaft contentSCM415
Machining precision of gearsDIN6 Quality
Lubricating oilKLUBER
Warmth remedyCarburizing, carbonitriding, excellent quenching
Brand of bearingsNSK/NTN
Brand name of oil sealSKF/TTO
Sounds (MAX)sixty-70dB
Temp. increase (MAX)70℃
Oil Temp. rise (MAX)40℃
Vibration≤15μm

Primary items

Application
Certifications
Firm info
Our group
Deal and delivery
FAQ Q1: Are you trading firm or company ?
A1: We have our personal manufacturing facility.

Q2: How extended is your delivery time?
A2: Normally it is 7-30 times.it is in accordance to amount.

Q3:Can we buy 1 pc of each and every item for high quality screening?
A3: Sure, we are happy to acknowledge demo get for good quality screening.

This fall: What is your phrases of payment ?
A4: We acknowledge T/T, Paypal, Western union .

Q5: What is your guarantee ?
A5: 1 yr.
Q6: What is actually your cargo strategy?
A6: We ship by FEDEX. UPS, DHL, EMS or Sea.

Key Market Insights Related to Worm Reduction Gearboxes

A gearbox is a mechanical device that allows you to shift between different speeds or gears. It does so by using one or more clutches. Some gearboxes are single-clutch, while others use two clutches. You can even find a gearbox with closed bladders. These are also known as dual clutches and can shift gears more quickly than other types. Performance cars are designed with these types of gearboxes.
gearbox

Backlash measurement

Gearbox backlash is a common component that can cause noise or other problems in a car. In fact, the beats and sets of gears in a gearbox are often excited by the oscillations of the engine torque. Noise from gearboxes can be significant, particularly in secondary shafts that engage output gears with a differential ring. To measure backlash and other dimensional variations, an operator can periodically take the output shaft’s motion and compare it to a known value.
A comparator measures the angular displacement between two gears and displays the results. In one method, a secondary shaft is disengaged from the gearbox and a control gauge is attached to its end. A threaded pin is used to secure the differential crown to the secondary shaft. The output pinion is engaged with the differential ring with the aid of a control gauge. The angular displacement of the secondary shaft is then measured by using the dimensions of the output pinion.
Backlash measurements are important to ensure the smooth rotation of meshed gears. There are various types of backlash, which are classified according to the type of gear used. The first type is called circumferential backlash, which is the length of the pitch circle around which the gear rotates to make contact. The second type, angular backlash, is defined as the maximum angle of movement between two meshed gears, which allows the other gear to move when the other gear is stationary.
The backlash measurement for gearbox is one of the most important tests in the manufacturing process. It is a criterion of tightness or looseness in a gear set, and too much backlash can jam a gear set, causing it to interface on the weaker part of its gear teeth. When backlash is too tight, it can lead to gears jamming under thermal expansion. On the other hand, too much backlash is bad for performance.

Worm reduction gearboxes

Worm reduction gearboxes are used in the production of many different kinds of machines, including steel and power plants. They are also used extensively in the sugar and paper industries. The company is constantly aiming to improve their products and services to remain competitive in the global marketplace. The following is a summary of key market insights related to this type of gearbox. This report will help you make informed business decisions. Read on to learn more about the advantages of this type of gearbox.
Compared to conventional gear sets, worm reduction gearboxes have few disadvantages. Worm gear reducers are commonly available and manufacturers have standardized their mounting dimensions. There are no unique requirements for shaft length, height, and diameter. This makes them a very versatile piece of equipment. You can choose to use one or combine several worm gear reducers to fit your specific application. And because they have standardized ratios, you will not have to worry about matching up multiple gears and determining which ones fit.
One of the primary disadvantages of worm reduction gearboxes is their reduced efficiency. Worm reduction gearboxes usually have a maximum reduction ratio of five to sixty. The higher-performance hypoid gears have an output speed of around ten to twelve revolutions. In these cases, the reduced ratios are lower than those with conventional gearing. Worm reduction gearboxes are generally more efficient than hypoid gear sets, but they still have a low efficiency.
The worm reduction gearboxes have many advantages over traditional gearboxes. They are simple to maintain and can work in a range of different applications. Because of their reduced speed, they are perfect for conveyor belt systems.
gearbox

Worm reduction gearboxes with closed bladders

The worm and the gear mesh with each other in a combination of sliding and rolling movements. This sliding action is dominant at high reduction ratios, and the worm and gear are made of dissimilar metals, which results in friction and heat. This limits the efficiency of worm gears to around thirty to fifty percent. A softer material for the gear can be used to absorb shock loads during operation.
A normal gear changes its output independently once a sufficient load is applied. However, the backstop complicates the gear configuration. Worm gears require lubrication because of the sliding wear and friction introduced during movement. A common gear arrangement moves power at the peak load section of a tooth. The sliding happens at low speeds on either side of the apex and occurs at a low velocity.
Single-reduction gearboxes with closed bladders may not require a drain plug. The reservoir for a worm gear reducer is designed so that the gears are in constant contact with lubricant. However, the closed bladders will cause the worm gear to wear out more quickly, which can cause premature wear and increased energy consumption. In this case, the gears can be replaced.
Worm gears are commonly used for speed reduction applications. Unlike conventional gear sets, worm gears have higher reduction ratios. The number of gear teeth in the worm reduces the speed of a particular motor by a substantial amount. This makes worm gears an attractive option for hoisting applications. In addition to their increased efficiency, worm gears are compact and less prone to mechanical failure.

Shaft arrangement of a gearbox

The ray-diagram of a gearbox shows the arrangement of gears in the various shafts of the transmission. It also shows how the transmission produces different output speeds from a single speed. The ratios that represent the speed of the spindle are called the step ratio and the progression. A French engineer named Charles Renard introduced five basic series of gearbox speeds. The first series is the gear ratio and the second series is the reverse gear ratio.
The layout of the gear axle system in a gearbox relates to its speed ratio. In general, the speed ratio and the centre distance are coupled by the gear axles to form an efficient transmission. Other factors that may affect the layout of the gear axles include space constraints, the axial dimension, and the stressed equilibrium. In October 2009, the inventors of a manual transmission disclosed the invention as No. 2. These gears can be used to realize accurate gear ratios.
The input shaft 4 in the gear housing 16 is arranged radially with the gearbox output shaft. It drives the lubricating oil pump 2. The pump draws oil from a filter and container 21. It then delivers the lubricating oil into the rotation chamber 3. The chamber extends along the longitudinal direction of the gearbox input shaft 4, and it expands to its maximum diameter. The chamber is relatively large, due to a detent 43.
Different configurations of gearboxes are based on their mounting. The mounting of gearboxes to the driven equipment dictates the arrangement of shafts in the gearbox. In certain cases, space constraints also affect the shaft arrangement. This is the reason why the input shaft in a gearbox may be offset horizontally or vertically. However, the input shaft is hollow, so that it can be connected to lead through lines or clamping sets.
gearbox

Mounting of a gearbox

In the mathematical model of a gearbox, the mounting is defined as the relationship between the input and output shafts. This is also known as the Rotational Mount. It is one of the most popular types of models used for drivetrain simulation. This model is a simplified form of the rotational mount, which can be used in a reduced drivetrain model with physical parameters. The parameters that define the rotational mount are the TaiOut and TaiIn of the input and output shaft. The Rotational Mount is used to model torques between these two shafts.
The proper mounting of a gearbox is crucial for the performance of the machine. If the gearbox is not aligned properly, it may result in excessive stress and wear. It may also result in malfunctioning of the associated device. Improper mounting also increases the chances of the gearbox overheating or failing to transfer torque. It is essential to ensure that you check the mounting tolerance of a gearbox before installing it in a vehicle.

China Standard FECO gearbox KTSR90 series Helical gear small right angle planetary gearbox for stepper motor robot synchromesh gearbox China Standard FECO gearbox KTSR90 series Helical gear small right angle planetary gearbox for stepper motor robot synchromesh gearbox
editor by czh

China Good quality 4mm, 10mm, 20mm CZPT Size Stepper Gear Motor Planetary Gearbox with Metal Shaft 3V, 9V, 12V 24V DC for Robot Joint with high quality

Solution Description

We are a factory specialised in metallic components components & metal gearbox by way of powder metallurgy approach .
We companies with ODM/OEM gearbox design and style and growth , gearmotors manufacture.
A planetary gearbox is a gearbox with the input shaft and output shaft aligned it gives higher torque transmission with good stiffness and minimal sounds , in a a lot more compact foot print than other gearbox types . It can supply a good deal of velocity reduction and torque in a tiny package deal with the mounted axis .
A planetary equipment set is produced up of 3 varieties of gears , a sunlight equipment , earth gears and a ring equipment . The solar equipment at substantial pace is positioned at the centre of the gears , and transmits torque to the earth gears which are generally mounted on the moveable CZPT .The world gears about the central axis rotation ,mesh with the sunshine equipment and an outer ring equipment . As all the earth carriers turns , it delivers lower-pace, large-torque output .
Description:
Merchandise Identify : Speed reducer / Gearmotor / planetary gearbox 
Gearbox Sort: Planetary
Materials: Steel
Equipment Ratio : 5:1 , 10:1 , 20:1 , 25:1 , 30:1 , forty:1 , 50:1 , sixty:1 ,70:1…100:1 , a hundred and fifty:1…  optional
Gearbox diameter : 6mm , 10mm , 12mm , 16mm , 22mm , 24mm , 32mm , 38mm , 42mm ……
3V ,9V , 12V ,24V obtainable .

Planetary Gearbox positive aspects:

  1. Offers high torque at sluggish speeds .
  2. The shafts are manufactured up of hardened and tempered alloy steel .
  3. Sunlight gears ,world gears and ring gears are created of powder metallurgy and sintering metal .
  4. Low sounds levels.
  5. Great top quality taper roller bearings for input and output shafts .
  6. Higher efficiency .
  7. Increased repeatability . Its  Its higher velocity radial and axial load delivers dependability and robustness, reducing the misalignment of the gear. In addition, uniform transmission and lower vibrations at diverse masses give a perfect repeatability.
  8. Excellent precision: Most CZPT angular balance enhances the precision and reliability of the movement.
  9. Decrease sound degree due to the fact there is more surface area make contact with. Rolling is much softer and jumps are nearly nonexistent.
  10. Better sturdiness: Due to its torsional rigidity and far better rolling. To improve this attribute, your bearings assist decrease the losses that would take place by rubbing the shaft on the box straight. Thus, greater effectiveness of the equipment and a much smoother procedure is accomplished.
  11. Increased torque transmission: With much more teeth in get in touch with, the mechanism is capable to transmit and endure much more torque. In addition, it does it in a much more uniform manner.
  12. Extremely great amounts of efficiency: Planetary reducers supply greater efficiency and thanks to its design and style and internal format losses are minimized for the duration of their perform. In fact, nowadays, this variety of generate mechanisms are these that offer you higher effectiveness.
  13. Greatest versatility: Its system is contained in a cylindrical gearbox, which can be set up in virtually any room.

PM procedure for custom metal planetary gearbox , geared motors .
The P/M procedure is an cost-effective, environmentally clean, large manufacturing approach for generating elements precisely to or shut to ultimate dimensions.  With little or no machining functions required.
At present, areas with a difficult form, restricted-dimensional tolerances, controlled density and qualities can be made by powder metallurgy approaches. A technological procedure of powder metallurgy assures higher overall flexibility in the selection of physiochemical qualities and other specifications, which includes:

  1. Manufacturing of structural areas with complicated styles .
  2. Controlled porosity .
  3. Substantial mechanical energy and resistance to vibrations .
  4. Controlled qualities.
  5. Substantial mechanical power and resistance to vibrations.
  6. Substantial production precision and excellent surface quality
  7. Huge amount of generation collection .
  8. Very good tolerances .

Personalized steel elements

 

Workshop

Right angle gearboxes (worm and planetary gears) are strong and can be used for 90° turns. An inline reducer (parallel shaft and planetary) is an ideal matching motor with high input speeds, or when equipment motor efficiency is important. Get in touch with our technological product sales workers to support determine which transmission resolution is ideal for you.
Gearboxes can be utilized in different fields of complete processing, agriculture, chemical processing, oil and gas, energy transmission and distribution systems, logistics, warehousing and other industries. Equipment reducers are normally used in which increased torque and/or decrease rotational speeds are needed, or if electrical power wants to be transmitted at alternating angles, such as in proper-angle motors. It can also change the direction of rotation, as well as clockwise and counterclockwise. EP provides a comprehensive variety of gear reducers with correct angle worms and substantial efficiency alternatives. Electrical Gear Aluminum products are a light-weight and durable different to present-day solid iron and metal models and can be stocked or custom made manufactured to your specific requirements. EP gearboxes are light-weight and sturdy, aluminum worm gearboxes are developed for restricted spaces, such as hard-to-set up OEM styles as nicely as cellular products. Eccentric reducers are accessible as compact aluminum or cast iron inline reducers with seal life ratings from 15HP (aluminum) to 40HP (solid iron). In addition to our common and modified standard goods, our engineers will perform with you to design and style and develop customized options for a number of generate systems to suit your software needs.

China Good quality 4mm, 10mm, 20mm CZPT Size Stepper Gear Motor Planetary Gearbox with Metal Shaft 3V, 9V, 12V 24V DC for Robot Joint with high quality

China best Close Loop Speed Reductor Small Servo Stepper Gearbox Powder Metallurgy Sintered Ratio Gear for DC Motor near me shop

Item Description

In a simple planetary gearbox setup, enter electricity turns the sunshine gear at high speed. The planets, spaced around the central axis of rotation, mesh with the sunlight as effectively as the mounted ring gear, so they are forced to orbit as they roll. All the planets are mounted to a single CZPT member, referred to as provider. As the world CZPT turns, it provides lower-speed, high-torque output. The Sun Gear Receives The Input Whilst The 3 World Gears Give The Ouput Via A World Carrier .

Our principal merchandise, metal gearboxes ,gear programs , steel gears for motors through powder metallurgy processing.
Gearbox ratio 3 :1 to 1000:1 .
We focus in creating and manufacturing very engineered, personalized gear elements , gearbox , components and assemblies. Our skilled personnel are geared in direction of providing consumers with higher top quality merchandise and superb support .
 

Tailored metallic areas specification

 

Item variety  Custom metallic gearbox , steel gearbox , metal equipment parts 
Materials metal
Approach Powder metallurgy , steel injection molding , cnc machining 
Therapy Passivate, Sprucing, Electroplate, Sandblasted, Oxidation, Bake Portray, Silkscreen, Laser carving, Heat Remedy, Anodizing,Tempering,Brushing, Galvanization, Nickel Plating, Oil Spraying, Coating Ni/Cr/Zinc Plating
 
Tolerance ±0.3%
Drawing structure DWG ,IGS , STP
Shipping time  ten days for mass production 

Our gearbox,Light-weight excess weight,modest size, higher carrying ability, long service existence .Clean procedure, lower noise, large output torque, huge velocity ratio, higher performance, electricity diversion, and multi-tooth meshing by powder metallurgy approach . 

Planetary Gearbox advantages:

  1. Gives substantial torque at slow speeds .
  2. The shafts are manufactured up of hardened and tempered alloy metal .
  3. Sunlight gears ,planet gears and ring gears are made of powder metallurgy and sintering metal .
  4. Lower sound ranges.
  5. Very good top quality taper roller bearings for input and output shafts .
  6. Substantial effectiveness .

Personalized Gearbox 

Workshop

Planetary gearboxes are utilized in a variety of situations in which substantial efficiency and higher reduction ratio are essential in a little space. Featuring high precision and high torque-to-quantity ratio, it is excellent for torque boost, deceleration, exact positioning and management of regenerative equipment. To ensure that the picked planetary gearbox is the ideal suit for your software, it is essential to contemplate parameters this kind of as torque, backlash and gear ratios when choosing a planetary gearbox.
Planetary gearboxes are used in different occasions in which substantial efficiency and large reduction ratio are needed in a tiny space. That includes substantial precision and high torque-to-volume ratio, it is ideal for torque increase, deceleration, specific positioning and control of regenerative machinery. To ensure that the chosen planetary gearbox is the ideal suit for your software, it is crucial to think about parameters such as torque, backlash and gear ratios when choosing a planetary gearbox.

China best Close Loop Speed Reductor Small Servo Stepper Gearbox Powder Metallurgy Sintered Ratio Gear for DC Motor near me shop

China Standard CZPT Pfn Series Stepper Motor Transmission Gearbox Planetary Gear Speed Reducer Gear Box with Great quality

Merchandise Description

Newgear PFN Sequence Stepper Motor Transmission Gearbox Planetary Gear Velocity Reducer Equipment Box

Solution Description

Planetary gearbox is a sort of reducer with broad flexibility. The internal gear adopts reduced carbon alloy steel carburizing quenching and grinding or nitriding approach. Planetary gearbox has the qualities of small composition dimensions, large output torque, large speed ratio, higher efficiency, secure and reliable efficiency, and many others. The inner equipment of the planetary gearbox can be divided into spur equipment and helical equipment. Customers can select the appropriate precision reducer in accordance to the needs of the application.

Description:
(1).The output shaft is created of large size,huge span double bearing design,output shaft and planetary arm bracket as a total.The enter shaft is put immediately on the planet arm bracket to make certain that the reducer has substantial functioning accuracy and highest torsional rigidity.
(2).Shell and the internal ring equipment employed integrated design,quenching and tempering right after the processing of the tooth so that it can obtain higher torque,high precision,high wear resistance.In addition surface nickel-plated anti-rust treatment method,so that its corrosion resistance greatly enhanced.
(3).The planetary equipment transmission employs full needle roller CZPT retainer to enhance the contact surface area,which drastically upgrades structural rigidity and support existence.
(4).The equipment is created of Japanese imported materials.Following the metal slicing procedure,the vacuum carburizing warmth remedy to fifty eight-62HRC. And then by the hobbing,Get the best tooth condition,tooth route,to ensure that the equipment of high precision and good influence toughness.
(5).Input shaft and solar gear built-in construction,in purchase to improve the procedure precision of the reducer.

 Characteristics:

one.Hole output construction,effortless set up.

two.Straight tooth generate ,one cantilever structure.basic design,financial cost.

three.Doing work continual. Minimal sounds.

four.Minimal return backlash. Can fit most situation.

five.The input relationship requirements are complete and there are numerous choices.
6.Keyway can be opened in the pressure shaft.
seven.Square mount flange output,high precision,substantial torque.
eight.Pace ratio range:3-a hundred
9.Precision range:8-16arcmin
10.Dimension variety:sixty-160mm

Parameters:

Sort PFN160 series Planetane Reducer
Ratio three:one
Optimum torque(Nm) 1.5 times rated torque
Emergency quit torque(Nm) 2. moments rated torque
Allowable radial drive(N) 2250
Allowable axial force(N) 1500
Torsional rigidity (Nm/arc-min) 35
Max. input velocity(rpm) 4000
Rated input speed(rpm) 3000
Sound(dB) ≤70
Average existence(h) 20000
Performance(%) ≥96%
Backlash eight-16arcmin
Second of intertia(kg.cm2) 36.seventy two
Rated torque(Nm) 364
Diploma of defense IP65
Procedure temperature(ºC) 90ºC to -10ºC
Excess weight(kg) fifteen.five
Content Alloy metal, aluminum alloy

Design Choice:

 

Company Profile

Newgear(China) receive German precision planetary gear style and manufacturing engineering,Generation of high rigidity, little backlash, reduced sound, stable transmission, dependable and durable planetary reducer,broadly utilised in a variety of fields.

Packaging & Transport

Equipment reducers are also called reducers. Mechanical components, by both of these two names, are created to minimize the electricity transferred in between the motor and the device amongst the rotational speeds (revolutions per moment). The reducer properly minimizes the rotational velocity created by the motor, thereby controlling the pace at which the equipment runs and increasing the torque made by the motor. Multiplying the torque made by the motor will increase the machine’s available energy – a approach acknowledged as “mechanical dominance”. In a greater context, equipment reducers are generally tools utilised to improve the performance of gear procedure.
Equipment reducers are also referred to as reducers. Mechanical add-ons, by both of these two names, are made to lessen the electricity transferred in between the motor and the machine among the rotational speeds (revolutions for every moment). The reducer properly reduces the rotational speed made by the motor, thereby controlling the velocity at which the device runs and escalating the torque created by the motor. Multiplying the torque made by the motor boosts the machine’s accessible power – a process identified as “mechanical dominance”. In a more substantial context, gear reducers are essentially tools utilised to improve the efficiency of tools operation.

China Standard CZPT Pfn Series Stepper Motor Transmission Gearbox Planetary Gear Speed Reducer Gear Box with Great quality

China Standard Transmission Geared Motor Unit Wp Nmrv Swl Screw Drive Lifts Stepper Cyclo Cycloidal Extruder Helical Plenetary Bevel Worm Speed Variator Gear Reducer Gearbox with Best Sales

Solution Description

Transmission Geared Motor Unit Wp Nmrv Swl Screw Push Lifts Stepper Cyclo Cycloidal Extruder Helical Plenetary Bevel Worm Velocity Variator Equipment Reducer Gearbox

Characteristics:
1. Light in fat and non-rusting
two. Smooth in running, can perform a long time in dreadful circumstances
3. Higher performance, reduced noise
four. Very good-seeking in look, durable in provider daily life, and small in quantity

Product photograph:

Specification for worm gearbox:

Product 571 ~ one hundred fifty
Power .06kw ~ 15kw
Enter velocity 750rpm ~ 2000rpm
Reduction ratio one/5 ~ 1/a hundred
Input motor AC (1 period or 3 stage) / DC / BLDC / Stepper / Servo
Output shaft Solid shaft / Hollow shaft / Output flange…
Dimension common Metric measurement / Inch dimensions
Content of housing die-forged aluminum / Cast iron / Stainless steel
Components Flange / Strong shaft / Torque arm / Protect …

FAQ
Q: Can you make the gearbox with customization?
A: Indeed, we can personalize per your request, like flange, shaft, configuration, material, and so on.

Q: Do you provide samples?
A: Sure. The sample is accessible for screening.

Q: What is your MOQ?
A: It is 10pcs for the starting of our business.

Q: What is actually your direct time?
A: Regular items require 5-30days, a little bit more time for tailored goods.

Q: Do you offer technical assistance?
A: Yes. Our company have style and development staff, we can offer technical assist if you
want.

Q: How to ship to us?
A: It is offered by air, or by sea, or by prepare.

Q: How to pay out the cash?
A: T/T and L/C are favored, with a various forex, like USD, EUR, RMB, and so forth.

Q: How can I know the solution is suitable for me?
A: >1ST validate drawing and specification >2nd test sample >3rd start off mass generation.

Q: Can I come to your company to go to?
A: Yes, you are welcome to check out us at any time.

Q: How shall we contact you?
A: You can send out an inquiry directly, and we will respond in 24 several hours.

 

Equipment reducers are also called reducers. Mechanical equipment, by both of these two names, are made to lessen the power transferred amongst the motor and the equipment among the rotational speeds (revolutions for each minute). The reducer successfully decreases the rotational speed developed by the motor, thus managing the velocity at which the machine runs and rising the torque created by the motor. Multiplying the torque produced by the motor raises the machine’s accessible electricity – a process known as “mechanical dominance”. In a greater context, equipment reducers are basically equipment employed to enhance the effectiveness of gear operation.
We are experienced transmission dealers and offer you a broad selection of transmissions, an crucial component of a lot of generate systems. Gearboxes can be utilised to decrease or increase pace, improve torque, reverse or change the direction of a travel shaft. Gearboxes are also acknowledged as equipment drives, speed reducers, equipment motors, speed reducers and equipment reducers.

China Standard Transmission Geared Motor Unit Wp Nmrv Swl Screw Drive Lifts Stepper Cyclo Cycloidal Extruder Helical Plenetary Bevel Worm Speed Variator Gear Reducer Gearbox with Best Sales