Tag Archives: 6v gear motor

China Standard DM-37RS3525 37mm 6v 12v 24v spur gearmotor reducer electric mini dc gear motor 300 rpm reduction gearbox wholesaler

Warranty: 6 months
Model Number: DM-37RS3525
Usage: BOAT, Car, Electric Bicycle, FAN, Home Appliance, Other
Type: GEAR MOTOR
Torque: 0.5-20kgf.cm
Construction: Permanent Magnet
Commutation: Brush
Protect Feature: Totally Enclosed
Speed(RPM): 1-1000rpm
Continuous Current(A): 0.1A-0.5A
Efficiency: Ie 3
Working Current: 0.1A-0.5A
Gearbox Size: 37mm round
Stall Torque: 1kgf.cm-50kgf.cm
Driving Motor Speed: 3000rpm-10000rpm
Gears Style: Metal gear
Shaft diameter: 6mm
Normal Shaft Length: 22mm
Certification: CE, Rohs, CCC, ce, RoHS, Other
Application: Robotic
Working Hours: 500 hours
Packaging Details: Inside plastic tray or foam packed with outer paper cartons

Products Description Appearance size: Products Specification Gearbox Data:

Number of stages
2
3
4
5
6
7

Reduction ratio
6.8,10
20,30
61,90
122, RU-168 MASUMA Australia hot sale Auto spare Parts Suspension Bushing for 1992-1996 Japanese cars 184,270
311,414,534 552,810
1243,1656 2430

Gearbox length “L”mm
19
22.5
25
27.5
30
31.5

Breaking torque(kgf.cm)
8
10
30
30
40
40

Gearbox efficiency
81%
73%
65%
59%
53%
48%

Driving Motor Data:

Motor model
RatedVolt.
No load

Load

Stall

Current
Speed
Current
Speed
Torque
Outputpower
Torque
Current

V
mA
r/min
mA
r/min
gf.cm
W
gf.cm
mA

DM-3525-012-3000
12
≤40
3000
≤170
2200
25
0.6
≥120
≥600

DM-3525-012-4500
12
≤60
4500
≤250
3300
35
1.2
≥ BAFFERO F Series Parallel Shaft Geared Motor Gear Reducer Gearbox with 220V380V440V 60HZ Motor Helical Cast Iron 1500 Rmin CE 180
≥900

DM-3525-012-6000
12
≤100
6000
≤450
4500
45
2.1
≥200
≥1300

DM-3525-571-3000
24
≤25
3000
≤80
2200
25
0.6
≥100
≥300

DM-3525-571-4500
24
≤30
4500
≤130
3300
35
1.2
≥180
≥450

DM-3525-571-6000
24
≤ Right angle shaft & spiral bevel gear reducer; Worm Gear Reducer; Agricultural Gearbox; reducers; 50
6000
≤170
4500
45
2.1
≥250
≥700

Gear Motor Data:

Motor model
RatedVolt.
No load

Load

Stall

Current
Speed
Current
Speed
Torque
Output power
Torque
Current

V
A
r/min
A
r/min
kgf.cm
W
kgf.cm
A

DM-37RS35250063000-810K
6.0
0.09
3.6
0.21
2.3
9.5
0.23
27.8
0.43

DM-37RS35250068000-534K
6.0
0.27
15.2
1.00
11.8
14.0
1.70
62.4
3.54

DM-37RS35250126000-61K
12.0
0.03
92.3
0.22
77.2
1.4
1.17
9.0
1.18

DM-37RS35250126000-90K
12.0
0.04
64.6
0.23
54.0
2.2
1.25
13.6
1.17

DM-37RS35250129000-534K
12.0
0.06
16.2
0.48
13.8
14.0
1.98
94.7
2.91

DM-37RS35255713000-121K
24.0
0.03
21.6
0.07
16.5
2.6
0.44
11.1
0.22

DM-37RS35255713200-810K
24.0
0.03
3.8
0.07
2.7
13.1
0.36
42.7
0.16

DM-37RS35255714500-6.8K
24.0
0.03
624.5
0.11
488.7
0.2
1.09
1.0
0.39

DM-37RS35255714500-20K
24.0
0.03
199.8
0.11
155.3
0.6
0.93
2.6
0.37

DM-37RS35255715400-1243K
24.0
0.02
4.1
0.10
3.2
16.5
0.55
78.1
0.37

DM-37RS35255716000-10K
24.0
0.04
610.3
0.19
491.0
0.5
2.37
2.4
0.79

DM-37RS35255716000-30K
24.0
0.03
204.5
0.15
172.9
0.9
1.58
5.7
0.82

DM-37RS35255716000-184K
24.0
0.03
32.6
0.12
26.5
4.0
1.08
21.0
0.53

DM-37RS35255718000-30K
24.0
0.04
262.8
0.26
223.4
1.2
2.73
7.9
1.48

HangZhou Xihu (West Lake) Dis.ming Motor Co., Ltd. is specialized in designing, manufacturing and selling micro DC motors, especially gear motors.We have successfully worked out over 100 series of micro DC motors. Our products are widely applied in household appliances,audio/video products, office equipment, health-care and beauty-care facilities, medical appliances, high-class toys, electronictools, electronic commodity, Car Gearbox Parts Counter Gear shaft 33421-35140 for CZPT hiace hilux Auto Spare Parts automotive parts and automatic systems.We have a team of professional staff who are working on R&Dand QC. They ensure our good quality managing system and advance technology.

How to Select a Gearbox

When you drive your vehicle, the gearbox provides you with traction and speed. The lower gear provides the most traction, while the higher gear has the most speed. Selecting the right gear for your driving conditions will help you maximize both. The right gearing will vary based on road conditions, load, and speed. Short gearing will accelerate you more quickly, while tall gearing will increase top speed. However, you should understand how to use the gearbox before driving.
gearbox

Function

The function of the gearbox is to transmit rotational energy to the machine’s drive train. The ratio between input and output torque is the ratio of the torque to the speed of rotation. Gearboxes have many different functions. A gearbox may have multiple functions or one function that is used to drive several other machines. If one gear is not turning, the other will be able to turn the gearbox. This is where the gearbox gets its name.
The pitch-controlled system has an equal number of failure modes as the electrical system, accounting for a large proportion of the longest machine downtime and halt time. The relationship between mechanisms and faults is not easily modeled mathematically. Failure modes of gearboxes are shown in Fig. 3. A gearbox’s true service life is six to eight years. However, a gearbox’s fault detection process must be developed as mature technology is required to reduce the downtime and avoid catastrophic incidents.
A gearbox is a vital piece of machinery. It processes energy produced by an engine to move the machine’s parts. A gearbox’s efficiency depends on how efficiently it transfers energy. The higher the ratio, the more torque is transferred to the wheels. It is a common component of bicycles, cars, and a variety of other devices. Its four major functions include:
In addition to ensuring gearbox reliability, a gearbox’s maintainability should be evaluated in the design phase. Maintainability considerations should be integrated into the gearbox design, such as the type of spare parts available. An appropriate maintenance regime will also determine how often to replace or repair specific parts. A proper maintenance procedure will also ensure that the gearbox is accessible. Whether it is easy to access or difficult to reach, accessibility is essential.

Purpose

A car’s transmission connects the engine to the wheels, allowing a higher-speed crankshaft to provide leverage. High-torque engines are necessary for the vehicle’s starting, acceleration, and meeting road resistance. The gearbox reduces the engine’s speed and provides torque variations at the wheels. The transmission also provides reversing power, making it possible to move the vehicle backwards and forwards.
Gears transmit power from one shaft to another. The size of the gears and number of teeth determine the amount of torque the unit can transmit. A higher gear ratio means more torque, but slower speed. The gearbox’s lever moves the engaging part on the shaft. The lever also slides the gears and synchronizers into place. If the lever slips to the left or right, the engine operates in second gear.
Gearboxes need to be closely monitored to reduce the likelihood of premature failure. Various tests are available to detect defective gear teeth and increase machine reliability. Figure 1.11(a) and (b) show a gearbox with 18 teeth and a 1.5:1 transmission ratio. The input shaft is connected to a sheave and drives a “V” belt. This transmission ratio allows the gearbox to reduce the speed of the motor, while increasing torque and reducing output speed.
When it comes to speed reduction, gear box is the most common method for reducing motor torque. The torque output is directly proportional to the volume of the motor. A small gearbox, for example, can produce as much torque as a large motor with the same output speed. The same holds true for the reverse. There are hybrid drives and in-line gearboxes. Regardless of the type, knowing about the functions of a gearbox will make it easier to choose the right one for your specific application.
gearbox

Application

When selecting a gearbox, the service factor must be considered. Service factor is the difference between the actual capacity of the gearbox and the value required by the application. Additional requirements for the gearbox may result in premature seal wear or overheating. The service factor should be as low as possible, as it could be the difference between the lifetime of the gearbox and its failure. In some cases, a gearbox’s service factor can be as high as 1.4, which is sufficient for most industrial applications.
China dominates the renewable energy industry, with the largest installed capacity of 1000 gigawatts and more than 2000 terawatt hours of electricity generated each year. The growth in these sectors is expected to increase the demand for gearboxes. For example, in China, wind and hydropower energy production are the major components of wind and solar power plants. The increased installation capacity indicates increased use of gearboxes for these industries. A gearbox that is not suitable for its application will not be functional, which may be detrimental to the production of products in the country.
A gearbox can be mounted in one of four different positions. The first three positions are concentric, parallel, or right angle, and the fourth position is shaft mount. A shaft mount gearbox is typically used in applications where the motor can’t be mounted via a foot. These positions are discussed in more detail below. Choosing the correct gearbox is essential in your business, but remember that a well-designed gearbox will help your bottom line.
The service factor of a gearbox is dependent on the type of load. A high shock load, for example, can cause premature failure of the gear teeth or shaft bearings. In such cases, a higher service factor is required. In other cases, a gearbox that is designed for high shock loads can withstand such loads without deteriorating its performance. Moreover, it will also reduce the cost of maintaining the gearbox over time.

Material

When choosing the material for your gearbox, you must balance the strength, durability, and cost of the design. This article will discuss the different types of materials and their respective applications and power transmission calculations. A variety of alloys are available, each of which offers its own advantages, including improved hardness and wear resistance. The following are some of the common alloys used in gears. The advantage of alloys is their competitive pricing. A gear made from one of these materials is usually stronger than its counterparts.
The carbon content of SPCC prevents the material from hardening like SS. However, thin sheets made from SPCC are often used for gears with lower strength. Because of the low carbon content, SPCC’s surface doesn’t harden as quickly as SS gears do, so soft nitriding is needed to provide hardness. However, if you want a gear that won’t rust, then you should consider SS or FCD.
In addition to cars, gearboxes are also used in the aerospace industry. They are used in space travel and are used in airplane engines. In agriculture, they are used in irrigation, pest and insect control machinery, and plowing machines. They are also used in construction equipment like cranes, bulldozers, and tractors. Gearboxes are also used in the food processing industry, including conveyor systems, kilns, and packaging machinery.
The teeth of the gears in your gearbox are important when it comes to performance. A properly meshing gear will allow the gears to achieve peak performance and withstand torque. Gear teeth are like tiny levers, and effective meshing reduces stress and slippage. A stationary parametric analysis will help you determine the quality of meshing throughout the gearing cycle. This method is often the most accurate way to determine whether your gears are meshing well.
gearbox

Manufacturing

The global gear market is divided into five key regions, namely, North America, Europe, Asia Pacific, and Latin America. Among these regions, Asia Pacific is expected to generate the largest GDP, owing to rapidly growing energy demand and investments in industrial infrastructure. This region is also home to some of the largest manufacturing bases, and its continuous building of new buildings and homes will support the industry’s growth. In terms of application, gearboxes are used in construction, agricultural machinery, and transportation.
The Industrial Gearbox market is anticipated to expand during the next several years, driven by the rapid growth of the construction industry and business advancements. However, there are several challenges that hamper the growth of the industry. These include the high cost of operations and maintenance of gear units. This report covers the market size of industrial gearboxes globally, as well as their manufacturing technologies. It also includes manufacturer data for the period of 2020-2024. The report also features a discussion of market drivers and restraints.
Global health crisis and decreasing seaborne commerce have moderately adverse effects on the industry. Falling seaborne commerce has created a barrier to investment. The value of international crude oil is expected to cross USD 0 by April 2020, putting an end to new assets development and exploitation. In such a scenario, the global gearbox market will face many challenges. However, the opportunities are huge. So, the market for industrial gearboxes is expected to grow by more than 6% by 2020, thanks to the increasing number of light vehicles sold in the country.
The main shaft of a gearbox, also known as the output shaft, spins at different speeds and transfers torque to an automobile. The output shaft is splined so that a coupler and gear can be connected to it. The counter shaft and primary shaft are supported by bearings, which reduce friction in the spinning element. Another important part of a gearbox is the gears, which vary in tooth count. The number of teeth determines how much torque a gear can transfer. In addition, the gears can glide in any position.

China Standard DM-37RS3525 37mm 6v 12v 24v spur gearmotor reducer electric mini dc gear motor 300 rpm reduction gearbox  wholesaler China Standard DM-37RS3525 37mm 6v 12v 24v spur gearmotor reducer electric mini dc gear motor 300 rpm reduction gearbox  wholesaler

China Professional Custom 12mm 3V 6V 12V Metal Gearbox with N20 DC Gear Motor with Great quality

Product Description

 

 

Item Parameters

Product:  ZWBMD571571-168

  • Rated Voltage: 3.0V
  • No Load Speed: 98 rpm
  • No Load Current: 80mA
  • Rated Load Speed: 86 rpm
  • Rated Load Current: 220mA
  • Rated Load Torque: 106 gf.cm
  • Rated Torque of Gear Box: 2,000 gf.cm
  • Instantaneous Torque of Gear Box: 6,000 gf.cm
  • Total Length L: 34 mm
  • Equipment Box Size L1: 19 mm

over specifications just for reference and customizable in accordance to demands.

Remember to allow us know your demands and we will supply you with micro transmission options.

Detailed Photos

 

 

Software

 

Firm Profile

HangZhou CZPT Machinery & Electronics Co., Ltd was recognized in 2001,We provide the overall drive answer for buyers from design and style, tooling fabrication, elements producing and assembly. 

Workshop


Tests Equipment

one) Competitive Advantages

  • one) Competitive Benefits
    19+calendar year knowledge in manufacturing motor gearbox
    We give technological assist from r&d, prototype, tests, assembly and serial generation , ODM &OEM
    Competitive Value
    Product Performance: Minimal sound, High efficiency, Lengthy lifespan
    Prompt Supply: fifteen doing work times right after payment
    Tiny Orders Approved

 2) Primary Merchandise

  • Precision reduction gearbox and its diameter:3.4mm-38mm,voltage:1.5-24V,electricity: .01-40W,output speed:5-2000rpm and output torque:1. gf.cm -50kgf.cm,

  • Custom-made worm and equipment transmission equipment
  • Exact electromechanical movement module
  • Exact element and assembly of plastic and metallic powder injection.

 

Our Companies

  • ODM & OEM
  • Gearbox design and advancement
  • Connected engineering support
  • Micro travel gearbox custom made solution

Packaging & Shipping

one) Packing Information

packed in nylon first of all, then carton, and then strengthened with wooden scenario for outer packing.
Or in accordance to client’s need.

two) Delivery Details

samples will be delivered in ten days
batch get foremost time according to the genuine situation.

 

Certifications

Certifications

We Have handed to maintain ISO9001:2015(CN11/3571),ISO14001:2004(U006616E0153R3M), ISO13485:2016(CN18/42018) and IATF16949:2016(CN11/3571.01).

and more…

 

FAQ

FAQ

1. Can you make the gearbox with customized technical specs?
Yes. We have layout and growth crew, also a great expression of engineers, each of them have
many work years knowledge.

2.Do you give the samples?
Yes. Our business can supply the samples to you, and the supply time is about 5-15days according to the specification of gearbox you need to have.

3.What is your MOQ?
Our MOQ is 2000pcs. But at the starting of our business, we take tiny order.

four. Do you have the product in stock?
I am sorry we donot have the product in inventory, All items are manufactured with orders.

five. Do you give technologies assist?
Of course. Our organization have design and style and advancement group, we can offer technological innovation help if you
want.

six.How to ship to us?
We will ship the goods to you according to the DHL or UPS or FEDEX etc account you offer. 

seven.How to spend the cash?
We take T/T in progress. Also we have distinct financial institution account for getting funds, like US dollors or RMB etc.

8. How can I know the solution is ideal for me?
Frist, you require to give us the far more particulars info about the merchandise. We will advise the merchandise to you according to your need of specification. Following you verify, we will get ready the samples to you. also we will offer you some good advancements in accordance to your merchandise use.

nine. Can I appear to your company to check out?
Indeed, you can occur to our firm to visit at anytime, and welcome to visit our organization.

ten. How do contact us ?
 Please send an inquiry

Picking a Gearbox For Your Application

The gearbox is an crucial part of bicycles. It is utilised for several needs, like speed and power. A gearbox is employed to achieve one particular or each of these objectives, but there is always a trade-off. Increasing velocity boosts wheel speed and forces on the wheels. Similarly, rising pedal pressure raises the drive on the wheels. This helps make it less difficult for cyclists to speed up their bicycles. However, this compromise tends to make the gearbox considerably less efficient than an perfect one particular.
gearbox

Dimensions

Gearboxes appear in distinct sizes, so the dimension of your device is dependent on the amount of phases. Utilizing a chart to decide how numerous levels are essential will aid you establish the proportions of your device. The ratios of individual phases are usually better at the leading and get more compact as you get closer to the final reduction. This data is crucial when selecting the right gearbox for your software. However, the dimensions of your gearbox do not have to be precise. Some manufacturers have guides that outline the needed proportions.
The support factor of a gearbox is a mixture of the required trustworthiness, the real service issue, and the load that the gearbox will endure. It can selection from 1. to 1.4. If the provider element of a gearbox is 1., it indicates that the device has just ample capacity to meet up with your requirements, but any additional specifications could lead to the unit to fail or overheat. Nevertheless, services factors of 1.4 are normally ample for most industrial programs, considering that they show that a gearbox can withstand 1.4 times its application requirement.
Different dimensions also have diverse shapes. Some varieties are concentric, whilst other people are parallel or at a proper angle. The fourth type of gearbox is named shaft mount and is used when mounting the gearbox by foot is unattainable. We will go over the different mounting positions later. In the meantime, maintain these proportions in thoughts when picking a gearbox for your application. If you have space constraints, a concentric gearbox is usually your best alternative.

Construction

The layout and building of a gearbox entails the integration of various factors into a solitary framework. The elements of a gearbox have to have sufficient rigidity and ample vibration damping houses. The layout recommendations note the approximate values for the parts and advise the creation approach. Empirical formulas have been utilized to establish the dimensions of the various parts. It was located that these techniques can simplify the layout approach. These methods are also employed to compute the angular and axial displacements of the parts of the gearbox.
In this project, we used a 3D modeling computer software named SOLIDWORKS to develop a 3-D product of a equipment reducer. We utilized this software program to simulate the structure of the gearbox, and it has effective design automation instruments. Though the gear reducer and housing are different areas, we product them as a one body. To help save time, we also taken off the auxiliary factors, this sort of as oil inlets and oil amount indicators, from the 3D product.
Our strategy is based mostly on parameter-optimized deep neural networks (DBNs). This model has equally supervised and unsupervised studying abilities, enabling it to be self-adaptive. This method is superior to classic approaches, which have poor self-adaptive function extraction and shallow community generalization. Our algorithm is in a position to understand faults in different states of the gearbox utilizing its vibration signal. We have examined our design on two gearboxes.
With the support of advanced materials science systems, we can now manufacture the housing for the gearbox using high-good quality steel and aluminium alloys. In addition, innovative telematics techniques have elevated the response time of producers. These technologies are predicted to create remarkable possibilities in the coming several years and gasoline the progress of the gearbox housing market. There are several various approaches to construct a gearbox, and these strategies are highly customizable. In this study, we will think about the layout and development of various gearbox kinds, as nicely as their factors.
gearbox

Doing work

A gearbox is a mechanical system that transmits electricity from one gear to another. The different kinds of gears are referred to as planetary gears and are employed in a assortment of apps. Dependent on the variety of gearbox, it might be concentric, parallel, or at a proper angle. The fourth kind of gearbox is a shaft mount. The shaft mount variety is utilised in programs that can’t be mounted by foot. The numerous mounting positions will be talked about later on.
Numerous design tips advise a services issue of 1., which demands to be modified primarily based on actual support circumstances. This aspect is the merged measure of exterior load, required dependability, and total gearbox daily life. In common, revealed support elements are the least demands for a distinct software, but a larger benefit is required for significant loading. This calculation is also advised for higher-speed gearboxes. Nevertheless, the support element need to not be a sole determining factor in the selection approach.
The second gear of a pair of gears has much more tooth than the first gear. It also turns slower, but with higher torque. The next gear usually turns in the reverse direction. The animation demonstrates this alter in path. A gearbox can also have much more than one pair of gears, and a first gear may be used for the reverse. When a gear is shifted from one situation to yet another, the next gear is engaged and the first equipment is engaged yet again.
Another term used to describe a gearbox is “gear box.” This term is an interchangeable term for diverse mechanical models containing gears. Gearboxes are generally employed to change pace and torque in a variety of purposes. Therefore, comprehending the gearbox and its areas is important to preserving your car’s performance. If you want to extend the daily life of your car, be sure to check the gearbox’s efficiency. The far better its functioning, the less most likely it is to fail.

Positive aspects

Automatic transmission bins are practically identical to mechanical transmission containers, but they also have an digital part that establishes the comfort and ease of the driver. Computerized transmission containers use special blocks to manage shifts successfully and consider into account information from other systems, as nicely as the driver’s enter. This assures precision and positioning. The adhering to are a couple of gearbox advantages:
A gearbox results in a tiny volume of drag when pedaling, but this drag is offset by the enhanced hard work to climb. The external derailleur system is much more productive when adjusted for friction, but it does not create as little drag in dry circumstances. The internal gearbox enables engineers to tune the shifting program to minimize braking issues, pedal kickback, and chain growth. As a outcome, an internal gearbox is a great option for bikes with substantial-performance factors.
Helical gearboxes offer you some rewards, including a minimal noise level and reduce vibration. They are also hugely durable and reliable. They can be prolonged in modular trend, which makes them much more high-priced. Gearboxes are very best for programs involving heavy hundreds. Alternatively, you can opt for a gearbox with numerous tooth. A helical gearbox is far more resilient and sturdy, but it is also more high-priced. However, the benefits considerably outweigh the down sides.
A gearbox with a handbook transmission is frequently much more vitality-successful than a single with an computerized transmission. In addition, these cars normally have reduce fuel use and increased emissions than their automatic counterparts. In addition, the driver does not have to be concerned about the brakes putting on out swiftly. Yet another advantage of a manual transmission is its affordability. A guide transmission is often accessible at a lower value than its computerized counterpart, and repairs and interventions are less difficult and much less costly. And if you have a mechanical issue with the gearbox, you can handle the gasoline intake of your motor vehicle with appropriate driving habits.
gearbox

Application

Although deciding on a gearbox for a particular software, the customer need to think about the load on the output shaft. Substantial affect hundreds will use out equipment tooth and shaft bearings, necessitating higher provider aspects. Other aspects to contemplate are the measurement and style of the output shaft and the surroundings. Thorough details on these variables will aid the client select the greatest gearbox. Many sizing programs are accessible to decide the most acceptable gearbox for a specific application.
The sizing of a gearbox depends on its enter velocity, torque, and the motor shaft diameter. The input velocity have to not exceed the required gearbox’s rating, as higher speeds can trigger premature seal put on. A low-backlash gearbox may be sufficient for a specific software. Making use of an output mechanism of the correct dimension might assist enhance the input speed. Nevertheless, this is not suggested for all purposes. To choose the appropriate gearbox, examine the manufacturer’s warranty and get in touch with customer support associates.
Different gearboxes have diverse strengths and weaknesses. A normal gearbox ought to be resilient and adaptable, but it must also be ready to transfer torque efficiently. There are a variety of varieties of gears, which includes open up gearing, helical gears, and spur gears. Some of the sorts of gears can be used to electricity large industrial machines. For instance, the most well-liked type of gearbox is the planetary drive gearbox. These are utilized in materials handling gear, conveyor methods, energy vegetation, plastics, and mining. Gearboxes can be used for substantial-speed applications, this sort of as conveyors, crushers, and relocating monorail programs.
Provider variables decide the existence of a gearbox. Frequently, producers recommend a service element of 1.. Nevertheless, the real worth might be increased or decrease than that. It is typically helpful to contemplate the provider aspect when picking a gearbox for a specific software. A service element of 1.4 signifies that the gearbox can handle 1.4 moments the load required. For example, a 1,000-inch-pound gearbox would want a 1,400-inch-pound gearbox. Service aspects can be modified to match various apps and circumstances.

China Professional Custom 12mm 3V 6V 12V Metal Gearbox with N20 DC Gear Motor     with Great qualityChina Professional Custom 12mm 3V 6V 12V Metal Gearbox with N20 DC Gear Motor     with Great quality