Tag Archives: variator gear box

China Xb Cycloidal Pin Wheel Speed Gearbox Variator Drive Power Transmission Cycloidal Gearbox Gear Box Marine Engine with Gearbox with Good quality

Solution Description

X / B collection cycloidal gearbox speed reducer

Swift Particulars:

Variety: XB sequence Cycloidal Pin Wheel Speed Reducer    

Input Speed: one thousand-1500rmp   

Output Speed: .3-280rpm

Certification: ISO9001 CE          

Ex Energy:.09-132KW                  

Guarantee: 1Years

Input Pace

≤2000rpm

Output Pace

Single-phase:eleven-136rpm
Two-phase:1.seventy eight-twelve.4rpm

Energy Selection

One-stage:.37-75Kw
Two-stage:.twenty five-18.5Kw

Assemble Type

Foot-mounted horizontal and flange vertical

Model

Goldgun

Ratio

Solitary-stage:eleven,17,23,29,35,forty three,59,71,87
Two-stage:121,187,289,391,473,595,731,841,1003,1225,1505

Associated Items

Firm Information

 


/ Piece
|
100 Pieces

(Min. Order)

###

Application: Motor, Electric Cars, Motorcycle, Machinery, Marine, Agricultural Machinery, Car
Function: Distribution Power, Clutch, Change Drive Torque, Change Drive Direction, Speed Changing, Speed Reduction, Speed Increase
Layout: Coaxial
Hardness: Hardened Tooth Surface
Installation: Horizontal Type
Step: Three-Step

###

Samples:
US$ 9999/Piece
1 Piece(Min.Order)

|
Request Sample

###

Input Speed
≤2000rpm
Output Speed
Single-stage:11-136rpm
Two-stage:1.78-12.4rpm
Power Range
Single-stage:0.37-75Kw
Two-stage:0.25-18.5Kw
Assemble Type
Foot-mounted horizontal and flange vertical
Brand
Goldgun
Ratio
Single-stage:11,17,23,29,35,43,59,71,87
Two-stage:121,187,289,391,473,595,731,841,1003,1225,1505

/ Piece
|
100 Pieces

(Min. Order)

###

Application: Motor, Electric Cars, Motorcycle, Machinery, Marine, Agricultural Machinery, Car
Function: Distribution Power, Clutch, Change Drive Torque, Change Drive Direction, Speed Changing, Speed Reduction, Speed Increase
Layout: Coaxial
Hardness: Hardened Tooth Surface
Installation: Horizontal Type
Step: Three-Step

###

Samples:
US$ 9999/Piece
1 Piece(Min.Order)

|
Request Sample

###

Input Speed
≤2000rpm
Output Speed
Single-stage:11-136rpm
Two-stage:1.78-12.4rpm
Power Range
Single-stage:0.37-75Kw
Two-stage:0.25-18.5Kw
Assemble Type
Foot-mounted horizontal and flange vertical
Brand
Goldgun
Ratio
Single-stage:11,17,23,29,35,43,59,71,87
Two-stage:121,187,289,391,473,595,731,841,1003,1225,1505

The Cyclonoidal Gearbox

Basically, the cycloidal gearbox is a gearbox that uses a cycloidal motion to perform its rotational movement. It is a very simple and efficient design that can be used in a variety of applications. A cycloidal gearbox is often used in applications that require the movement of heavy loads. It has several advantages over the planetary gearbox, including its ability to be able to handle higher loads and higher speeds.helical gearbox

Dynamic and inertial effects of a cycloidal gearbox

Several studies have been conducted on the dynamic and inertial effects of a cycloidal gearbox. Some of them focus on operating principles, while others focus on the mathematical model of the gearbox. This paper examines the mathematical model of a cycloidal gearbox, and compares its performance with the real-world measurements. It is important to have a proper mathematical model to design and control a cycloidal gearbox. A cycloidal gearbox is a two-stage gearbox with a cycloid disc and a ring gear that revolves around its own axis.
The mathematical model is made up of more than 1.6 million elements. Each gear pair is represented by a reduced model with 500 eigenmodes. The eigenfrequency for the spur gear is 70 kHz. The modally reduced model is a good fit for the cycloidal gearbox.
The mathematical model is validated using ABAQUS software. A cycloid disc was discretized to produce a very fine model. It requires 400 element points per tooth. It was also verified using static FEA. This model was then used to model the stiction of the gears in all quadrants. This is a new approach to modelling stiction in a cycloidal gearbox. It has been shown to produce results comparable to those of the EMBS model. The results are also matched by the elastic multibody simulation model. This is a good fit for the contact forces and magnitude of the cycloid gear disc. It was also found that the transmission accuracy between the cycloid gear disc and the ring gear is about 98.5%. However, this value is lower than the transmission accuracy of the ring gear pair. The transmission error of the corrected model is about 0.3%. The transmission accuracy is less because of the lower amount of elastic deformation on the tooth flanks.
It is important to note that the most accurate contact forces for each tooth of a cycloid gearbox are not smooth. The contact force on a single tooth starts with a linear rise and then ends with a sharp drop. It is not as smooth as the contact force on a point contact, which is why it has been compared to the contact force on an ellipse contact. However, the contact on an ellipse contact is still relatively small, and the EMBS model is not able to capture this.
The FE model for the cycloid disc is about 1.6 million elements. The most important part of the FE model is the discretization of the cycloid disc. It is very important to do the discretization of the cycloid gear disc very carefully because of the high degree of vibration that it experiences. The cycloid disc has to be discretized finely so that the results are comparable to those of a static FEA. It has to be the most accurate model possible in order to be able to accurately simulate the contact forces between the cycloid disc and the ring gear.helical gearbox

Kinematics of a cycloidal drive

Using an arbitrary coordinate system, we can observe the motion of components in a cycloidal gearbox. We observe that the cycloidal disc rotates around fixed pins in a circle, while the follower shaft rotates around the eccentric cam. In addition, we see that the input shaft is mounted eccentrically to the rolling-element bearing.
We also observe that the cycloidal disc rotates independently around the eccentric bearing, while the follower shaft rotates around an axis of symmetry. We can conclude that the cycloidal disc plays a pivotal role in the kinematics of a cycloidal gearbox.
To calculate the efficiency of the cycloidal reducer, we use a model that is based on the non-linear stiffness of the contacts. In this model, the non-linearity of the contact is governed by the non-linearity of the force and the deformation in the contact. We have shown that the efficiency of the cycloidal reducer increases as the load increases. In addition, the efficiency is dependent on the sliding velocity and the deformations of the normal load. These factors are considered as the key variables to determine the efficiency of the cycloidal drive.
We also consider the efficiency of the cycloidal reducer with the input torque and the input speed. We can calculate the efficiency by dividing the net torque in the ring gear by the output torque. The efficiency can be adjusted to suit different operating conditions. The efficiency of the cycloidal drive is increased as the load increases.
The cycloidal gearbox is a multi-stage gearbox with a small shaft oin and a big shaft. It has 19 teeth and brass washers. The outer discs move in opposition to the middle disc, and are offset by 180 deg. The middle disc is twice as massive as the outer disc. The cycloidal disc has nine lobes that move by one lobe per drive shaft revolution. The number of pins in the disc should be smaller than the number of pins in the surrounding pins.
The input shaft drives an eccentric bearing that is able to transmit the power to the output shaft. In addition, the input shaft applies forces to the cycloidal disk through the intermediate bearing. The cycloidal disk then advances in 360 deg/pivot/roller steps. The output shaft pins then move around in the holes to make the output shaft rotate continuously. The input shaft applies a sinusoidal motion to maintain the constant speed of the base shaft. This sine wave causes small adjustments to the follower shaft. The forces applied to the internal sleeves are a part of the equilibrium mechanism.
In addition, we can observe that the cycloidal drive is capable of transmitting a greater torque than the planetary gear. This is due to the cycloidal gear’s larger axial length and the ring gear’s smaller hole diameter. It is also possible to achieve a positive fit between the fixed ring and the disc, which is achieved by toothing between the fixed ring and the disc. The cycloidal disk is usually designed with a short cycloid to minimize unbalance forces at high speeds.helical gearbox

Comparison with planetary gearboxes

Compared to planetary gearboxes, the cycloidal gearbox has some advantages. These advantages include: low backlash, better overload capacity, a compact design, and the ability to perform in a wide range of applications. The cycloidal gearbox has become popular in the multi-axis robotics market. The gearbox is also increasingly used in first joints and positioners.
A cycloidal gearbox is a gearbox that consists of four basic components: a cycloid disk, an output flange, a ring gear, and a fixed ring. The cycloid disk is driven by an eccentric shaft, which advances in a 360deg/pivot/roller step. The output flange is a fixed pin disc that transmits the power to the output shaft. The ring gear is a fixed ring, and the input shaft is connected to a servomotor.
The cycloidal gearbox is designed to control inertia in highly dynamic situations. These gearboxes are generally used in robotics and positioners, where they are used to position heavy loads. They are also commonly used in a wide range of industrial applications. They have higher torque density and a low backlash, making them ideal for heavy loads.
The output flange is also designed to handle a torque of up to 500 Nm. Its rotational speed is lower than the planet gearbox, but its output torque is much higher. It is designed to be a high-performance gearbox, and it can be used in applications that need high ratios and a high level of torque density. The cycloid gearbox is also less expensive and has less backlash. However, the cycloidal gearbox has disadvantages that should be considered when designing a gearbox. The main problem is vibrations.
Compared to planetary gearboxes, cycloidal gearboxes have a smaller overall size and are less expensive. In addition, the cycloid gearbox has a large reduction ratio in one stage. In general, cycloidal gearboxes have single or two stages, with the third stage being less common. However, the cycloid gearbox is not the only type of gearbox that has this type of configuration. It is also common to find a planetary gearbox with a single stage.
There are several different types of cycloidal gearboxes, and they are often referred to as cycloidal speed reducers. These gearboxes are designed for any industry that uses servos. They are shorter than planetary gearboxes, and they are larger in diameter for the same torque. Some of them are also available with a ratio lower than 30:1.
The cycloid gearbox can be a good choice for applications where there are high rotational speeds and high torque requirements. These gearboxes are also more compact than planetary gearboxes, and are suitable for high-torque applications. In addition, they are more robust and can handle shock loads. They also have low backlash, and a higher level of accuracy and positioning accuracy. They are also used in a wide range of applications, including industrial robotics.
China Xb Cycloidal Pin Wheel Speed Gearbox Variator Drive Power Transmission Cycloidal Gearbox Gear Box Marine Engine with Gearbox     with Good quality China Xb Cycloidal Pin Wheel Speed Gearbox Variator Drive Power Transmission Cycloidal Gearbox Gear Box Marine Engine with Gearbox     with Good quality
editor by CX 2023-03-27

China WPWDKT compact worm gearbox spiral bevel helical gear box power transmission electronic variator chinese reducer cycloidal gearbox

Gearing Arrangement: Worm
Output Torque: 1.8-2430N.M
Enter Speed: fourteen.2 bearing taper roller bearing F-237542.02 a hundred and twenty,135,147,155, FT800A.forty one.143 PTO connecting bolt For CZPT Lovol Agricultural Genuine tractor Spare Components Farm Tractors 175,200,250
Packaging Information: Wood bins , Cantons packed in 1 pallet
Port: ZheJiang /HangZhou Port

WPWDKT compact worm gearbox spiral bevel helical gear box electrical power transmission digital variator chinese reducer

Certifications

Trade Displays

Packaging & HXHV LMB8 UU 12 Inch Linear Bushing Ball Bearing With Size twelve.7×22.225×31.75mm ShippingPacking Particulars : Regular carton/Pallet/Standard wood circumstance
Supply Specifics : 15-30 operating days on payment

Business Info
other sequence solution

Precision Planetary gearboxRobotic RV gearbox speed reducer
Customized produced Non-standard GearboxUDL Collection Variator
PYZ Series Helical Tooth Shaft Mounted Reducer8000 Collection Cycloidal Reducer
SLT Series Spiral Bevel GearboxSLSWL Sequence Worm Screw Jack
SLP Series Planetary ReducerSLH/SLB Series Substantial Power Reducer
NMRV Series Worm ReducerBKM Series Helical-hypoid Reducer
SLRC Collection Helical ReducerSLSMR Series Shaft Mounted Reducer
SLXG Series Shaft Mounted ReducerX/B Series Cycloidal Reducer
SLR/SLF/SLK/SLS Series Helical Reducer
Related Products

Contact

What Is a Gearbox?

There are several factors to consider when choosing a gearbox. Backlash, for example, is a consideration, as it is the angle at which the output shaft can rotate without the input shaft moving. While this isn’t necessary in applications without load reversals, it is important for precision applications involving load reversals. Examples of these applications include automation and robotics. If backlash is a concern, you may want to look at other factors, such as the number of teeth in each gear.
gearbox

Function of a gearbox

A gearbox is a mechanical unit that consists of a chain or set of gears. The gears are mounted on a shaft and are supported by rolling element bearings. These devices alter the speed or torque of the machine they are used in. Gearboxes can be used for a wide variety of applications. Here are some examples of how gearboxes function. Read on to discover more about the gears that make up a gearbox.
Regardless of the type of transmission, most gearboxes are equipped with a secondary gear and a primary one. While the gear ratios are the same for both the primary and secondary transmission, the gearboxes may differ in size and efficiency. High-performance racing cars typically employ a gearbox with two green and one blue gear. Gearboxes are often mounted in the front or rear of the engine.
The primary function of a gearbox is to transfer torque from one shaft to another. The ratio of the driving gear’s teeth to the receiving member determines how much torque is transmitted. A large gear ratio will cause the main shaft to revolve at a slower speed and have a high torque compared to its counter shaft. Conversely, a low gear ratio will allow the vehicle to turn at a lower speed and produce a lower torque.
A conventional gearbox has input and output gears. The countershaft is connected to a universal shaft. The input and output gears are arranged to match the speed and torque of each other. The gear ratio determines how fast a car can go and how much torque it can generate. Most conventional transmissions use four gear ratios, with one reverse gear. Some have two shafts and three inputs. However, if the gear ratios are high, the engine will experience a loss of torque.
In the study of gearbox performance, a large amount of data has been collected. A highly ambitious segmentation process has yielded nearly 20,000 feature vectors. These results are the most detailed and comprehensive of all the available data. This research has a dual curse – the first is the large volume of data collected for the purpose of characterization, while the second is the high dimensionality. The latter is a complication that arises when the experimental gearbox is not designed to perform well.
gearbox

Bzvacklash

The main function of a gearhead is to multiply a moment of force and create a mechanical advantage. However, backlash can cause a variety of issues for the system, including impaired positioning accuracy and lowered overall performance. A zero backlash gearbox can eliminate motion losses caused by backlash and improve overall system performance. Here are some common problems associated with backlash in gearheads and how to fix them. After you understand how to fix gearbox backlash, you’ll be able to design a machine that meets your requirements.
To reduce gearbox backlash, many designers try to decrease the center distance of the gears. This eliminates space for lubrication and promotes excessive tooth mesh, which leads to premature mesh failure. To minimize gearbox backlash, a gear manufacturer may separate the two parts of the gear and adjust the mesh center distance between them. To do this, rotate one gear with respect to the fixed gear, while adjusting the other gear’s effective tooth thickness.
Several manufacturing processes may introduce errors, and reducing tooth thickness will minimize this error. Gears with bevel teeth are a prime example of this. This type of gear features a small number of teeth in comparison to its mating gear. In addition to reducing tooth thickness, bevel gears also reduce backlash. While bevel gears have fewer teeth than their mating gear, all of their backlash allowance is applied to the larger gear.
A gear’s backlash can affect the efficiency of a gearbox. In an ideal gear, the backlash is zero. But if there is too much, backlash can cause damage to the gears and cause it to malfunction. Therefore, the goal of gearbox backlash is to minimize this problem. However, this may require the use of a micrometer. To determine how much gearbox backlash you need, you can use a dial gauge or feeler gauge.
If you’ve been looking for a way to reduce backlash, a gearbox’s backlash may be the answer. However, backlash is not a revolt against the manufacturer. It is an error in motion that occurs naturally in gear systems that change direction. If it is left unaccounted for, it can lead to major gear degradation and even compromise the entire system. In this article, we’ll explain how backlash affects gears and how it affects the performance of a gearbox.

Design

The design of gearboxes consists of a variety of factors, including the type of material used, power requirements, speed and reduction ratio, and the application for which the unit is intended. The process of designing a gearbox usually begins with a description of the machine or gearbox and its intended use. Other key parameters to consider during gearbox design include the size and weight of the gear, its overall gear ratio and number of reductions, as well as the lubrication methods used.
During the design process, the customer and supplier will participate in various design reviews. These include concept or initial design review, manufacturing design validation, critical design review, and final design review. The customer may also initiate the process by initiating a DFMEA. After receiving the initial design approval, the design will go through several iterations before the finalized design is frozen. In some cases, the customer will require a DFMEA of the gearbox.
The speed increaser gearboxes also require special design considerations. These gearboxes typically operate at high speeds, causing problems with gear dynamics. Furthermore, the high speeds of the unit increase frictional and drag forces. A proper design of this component should minimize the effect of these forces. To solve these problems, a gearbox should incorporate a brake system. In some cases, an external force may also increase frictional forces.
Various types of gear arrangements are used in gearboxes. The design of the teeth of the gears plays a significant role in defining the type of gear arrangement in the gearbox. Spur gear is an example of a gear arrangement, which has teeth that run parallel to the axis of rotation. These gears offer high gear ratios and are often used in multiple stages. So, it is possible to create a gearbox that meets the needs of your application.
The design of gearboxes is the most complex process in the engineering process. These complex devices are made of multiple types of gears and are mounted on shafts. They are supported by rolling element bearings and are used for a variety of applications. In general, a gearbox is used to reduce speed and torque and change direction. Gearboxes are commonly used in motor vehicles, but can also be found in pedal bicycles and fixed machines.
gearbox

Manufacturers

There are several major segments in the gearbox market, including industrial, mining, and automotive. Gearbox manufacturers are required to understand the application and user industries to design a gearbox that meets their specific requirements. Basic knowledge of metallurgy is necessary. Multinational companies also provide gearbox solutions for the power generation industry, shipping industry, and automotive industries. To make their products more competitive, they need to focus on product innovation, geographical expansion, and customer retention.
The CZPT Group started as a small company in 1976. Since then, it has become a global reference in mechanical transmissions. Its production range includes gears, reduction gearboxes, and geared motors. The company was the first in Italy to achieve ISO certification, and it continues to grow into one of the world’s leading manufacturers of production gearboxes. As the industry evolves, CZPT focuses on research and development to create better products.
The agriculture industry uses gearboxes to implement a variety of processes. They are used in tractors, pumps, and agricultural machinery. The automotive industry uses gears in automobiles, but they are also found in mining and tea processing machinery. Industrial gearboxes also play an important role in feed and speed drives. The gearbox industry has a diverse portfolio of manufacturers and suppliers. Here are some examples of gearboxes:
Gearboxes are complex pieces of equipment. They must be used properly to optimize efficiency and extend their lifespan. Manufacturers employ advanced technology and strict quality control processes to ensure their products meet the highest standards. In addition to manufacturing precision and reliability, gearbox manufacturers ensure that their products are safe for use in the production of industrial machinery. They are also used in office machines and medical equipment. However, the automotive gearbox market is becoming increasingly competitive.

China WPWDKT compact worm gearbox spiral bevel helical gear box power transmission electronic variator chinese reducer     cycloidal gearbox	China WPWDKT compact worm gearbox spiral bevel helical gear box power transmission electronic variator chinese reducer     cycloidal gearbox
editor by czh 2023-02-17

Best China manufacturer & factory WPA060 ratio 20,40,50,60 W-worm gear box speed reducer speed variator line transmission light duty gearbox small on sale With high quality best price

Best China manufacturer & factory WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale With high quality best price

If you are interested in any of our products or would like to discuss a potential order, please feel free to contact us. The star tube is suitable for applications with high torque peaks that could be harmful to the other tube shapes. The star tube with 6 contact points is also the preferred choice when transmissions exceed 1600mm in length and when the speed is 1000 rpm. AG series with splined tube The splined tube is suggested for very short PTO shafts. The splined telescopic shaft allows bushing and splined couplings of only 100-120mm. The dimensions of the cross joints vary from 22mm diameter up to 48mm diameter and allow power transmission of up to 250HP.

Overview

Quick Details

Applicable Industries:

Manufacturing Plant, Machinery Repair Shops, Food & Beverage Factory, farms

Place of Origin:Zhejiang, China
Brand Name:

OEM

Gearing Arrangement:

worm

Output Torque:

31-39N.M

Input Speed:

1400RPM

Output Speed:

19-186.7RPM

Color:
EPG is specialized in design, manufacturer and sales of agricultural machinery and farm implements, which has an independent import and export rights.

silver, blue, black and so on

speed ratio:

5,10,15,20,30,40,50,60,

size:

40,50,60,70,80,100,120,135,147,155,175,200,150

oil:

0.13,0.17,0.22,0.6,1.5,3.2,3.6,3.7,3.8,4.6,6.5,9

MOQ:

1pcs

EPG Drive Worm Gears Worm Gear Model HP Model HP double-enveloping worm gear speed reducers are designed for all applications that require extremely high torque and accuracy in a quiet, compact packag EPG Drive Worm Gear Model HPe. Model HP speed reducers have higher shock resistance, greater endurance to withstand heavy starting and stopping loads, and can easily transmit two to three times as much torque as cylindrical worm gearing. Precision is increased, and backlash, chatter and noise are minimized. These speed reducers are designed for applications such as metalworking machinery, printing equipment and packaging machinery, mining equipment, and many others. Model HP double and triple reduction worm gear speed reducers combine multiple single reduction speed reducers into one assembly. These units are built using true double-enveloping worm gearing. Each of the gearsets is supported by heavy-duty tapered roller bearings and housed in its own heat dissipating housing.

note the price for WPA60 ratio:

20,40,50,60

if your quantity morw than 2000-3000 pcs:

will have competive price ,please contact Ms Shadow

Packaging & Delivery

Lead Time
:
Quantity(Boxes) 1 – 50 >50
Est. Time(days) 7 To be negotiated

Online Customization

Product Description

 WPA060 worm speed reducer mechanical speed variator line transmission light duty gearbox small helical gear box

WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale

WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale

 

 WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale

WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale

 

 

 

 

Certifications

WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale   

 

 

Trade Shows

         WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale 

    

 

Packaging & Shipping

Packing Details  : Standard carton/Pallet/Standard wooden case

Delivery Details : 15-30 working days upon payment

WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale 

Company Information

WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale 

other series product

Precision Planetary gearbox Robot RV gearbox speed reducer
Custom made Non-standard Gearbox UDL Series Variator
PYZ Series Helical Tooth Shaft Mounted Reducer 8000 Series Cycloidal Reducer
SLT Series  Spiral Bevel Gearbox SLSWL Series Worm Screw Jack
SLP Series Planetary Reducer SLH/SLB Series High Power Reducer
NMRV Series Worm Reducer BKM Series Helical-hypoid Reducer
SLRC Series Helical Reducer SLSMR Series Shaft Mounted Reducer
SLXG Series Shaft Mounted Reducer X/B Series Cycloidal Reducer
SLR/SLF/SLK/SLS Series Helical Reducer  

Related Products

 

 

Contact

 WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale

        WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale

 

 

 

 

Best China manufacturer & factory WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale With high quality best price

Best China manufacturer & factory WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale With high quality best price

Best China manufacturer & factory WPA060 ratio 20,40,50,60  W-worm gear box speed reducer  speed variator line transmission light duty gearbox small on sale With high quality best price