Tag Archives: transmission shaft

China 45#Steel Planetary Hollow Shaft Transmission High Torque Speed Reduction Planetary Gearbox planetary gearbox definition

Item Description

Solution Description

 

The reducer is typically employed for reduced-pace and substantial-torxque transmission products. The motor, internal combustion motor or other large-speed working electricity is used to obtain the goal of deceleration by meshing with the huge gear on the output shaft through a gear with a small variety of enamel on the enter shaft of the reducer. The reducer will also have a number of pairs of gears with the same basic principle to accomplish the perfect reduction effect. The ratio of the number of tooth of the huge and modest gears is the transmission ratio.
 

 

SPECIFICATIONS Phase RATIO RATED TORQUE (N.m)
PLF80- Planetry Gearbox  L2 422:one 200
Adapted motor DC gear motor
Rated Input Speed (rpm) 3000/min
Max Input Pace (rpm) 6000/min
Backlash L1 ≤30Arcmin
L2 ≤35Arcmin
Fault end torque(N.m) 350
Efficiency L1 94%
L2 80%
Average lifestyle span 20000h
Operating temperature -40°~+90°
Nosie  ≤60 db
Weight (kg) L1 1.5
L2 2
IP 65
Installation method Any set up method

 

 

Generation Selection

 

forty two Series Planetary Gearbox

Backlash: ten-15 arcmin

Ratio Variety:

L1: 4,5,7,10,

L2: 12,16,twenty,25,28,35,forty,fifty,70

Frame Dimension: 42mm Enter Flange

Equipment Arrangement: Planetary Straight Teeth

sixty Collection Planetary Gearbox

Backlash: ten-fifteen arcmin

Ratio Choice:
L1: 4,5,7,ten,
L2: 16,twenty,twenty five,28,35,40,fifty,70
Frame Dimension: 60mm Enter Flange
Equipment Arrangement: Planetary Straight Tooth

90 Sequence Planetary Gearbox

Backlash: 10-15 arcmin
Ratio Choice:
L1: 4,5,7,10,
L2: 16,twenty,25,28,35,40,50,70
Body Dimension: 90mm Input Flange
Gear Arrangement: Planetary Straight Teeth

Powder Metallic Series Planetary Gearbox

Backlash: ten-15 arcmin
Ratio Variety:
L1: 4,5,7,ten,
L2: 16,20,twenty five,28,35,forty,fifty,70
Body Dimension: 42mm & 57mm
Equipment Arrangement: Planetary Straight Tooth

Correct Angle Series Planetary Gearbox

Backlash: ten-15 arcmin
Ratio Choice:
L1: 4,5,7,10,

L2: 16,20,25,28,35,forty,fifty,70
Body Dimension: 60mm & 90mm
Equipment Arrangement: Planetary Straight Tooth

 

Application Field

Computerized Arms

 

Assembly Line

 

3D-Printer

 

Health care -Tools

 

CNC Equipment

 

Tapping Device

 

Other Automation Devices

 

Why Decide on Us

 

ZheJiang Higher Precision Gear Transmission Co., Ltd

 

 

 

Firm
 

 

ZheJiang High Precision Gear Transmission Co., Ltd situated in HangZhou city, ZheJiang Province, China. It is a leading business devoted in precision transmission elements and technique investigation, manufacture and product sales, different series of merchandise are manufactured in its 5000 sq. meters workshop, the precision planetary gearbox and gear motor are created specially for solar vitality industry and have served many big-scale solar initiatives worldwidely. 

The study team has much more than 15 several years ordeals in this discipline, who can make certain a punctual and successful provider to meet up with customer’s particular wants. It has pasted the ISO9001 high quality administration system and CE, goods have been exported to heaps of international locations with a extensive range software in AGV, clever robot, logistic, industrial automation, solar vitality, vessel, packaging and textile and so forth.Constantly, our aim is to encourage the software of solar power industry in the entire world, and we imagine it supplies clean and sustainable energy for humanity to greater safeguard our atmosphere.

WORKSHOP

CERTIFICATIONS

FAQ

 

Q:Which areas are your goods primarily utilized in?

A:At existing, we have 2 principal products: precision planetary equipment reducer and solar geared motor. Most of the precision planetary reducers are utilized in automation fields, these kinds of as health care gear, 3D printers, door openers, tapping machines, CNC lathes and a sequence of automation tools. In addition, our photo voltaic geared motors are utilized in photovoltaic electrical power generation assignments, which are largely combined with rotary drives to push photo voltaic panels to keep track of daylight.
Q : How to select the suited planetary gearbox?
A :Very first of all, we want you to be CZPT to give relevant parameters. If you have a motor drawing, it will permit us advise a ideal gearbox for you faster. If not, we hope you can give the pursuing motor parameters: output velocity, output torque, voltage, recent, IP, sound, operating problems, motor size and electricity, and many others.
Q : What is the price tag ?
A : The principal figuring out element for the cost of each item is the order quantity. You can connect with us and let us understand every single other. I imagine that our prices, product high quality and our companies can undoubtedly make you content.

Q : Do you offer customized service?

A: Indeed, we supply custom-made companies. You only need to place ahead your needs, and we will do our very best to offer you with a plan, make ideas, and try our greatest to meet up with your requirements.

 

 

Application: Motor, Machinery, Marine, Agricultural Machinery
Function: Distribution Power, Change Drive Torque, Change Drive Direction, Speed Changing, Speed Reduction
Layout: Coaxial
Hardness: Hardened Tooth Surface
Installation: Vertical Type
Step: Double-Step

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Samples:
US$ 80/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:

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SPECIFICATIONS STAGE RATIO RATED TORQUE (N.m)
PLF80- Planetry Gearbox  L2 422:1 200
Adapted motor DC gear motor
Rated Input Speed (rpm) 3000/min
Max Input Speed (rpm) 6000/min
Backlash L1 ≤30Arcmin
L2 ≤35Arcmin
Fault stop torque(N.m) 350
Efficiency L1 94%
L2 80%
Average life span 20000h
Operating temperature -40°~+90°
Nosie  ≤60 db
Weight (kg) L1 1.5
L2 2
IP 65
Installation method Any installation method
Application: Motor, Machinery, Marine, Agricultural Machinery
Function: Distribution Power, Change Drive Torque, Change Drive Direction, Speed Changing, Speed Reduction
Layout: Coaxial
Hardness: Hardened Tooth Surface
Installation: Vertical Type
Step: Double-Step

###

Samples:
US$ 80/Piece
1 Piece(Min.Order)

|
Request Sample

###

Customization:

###

SPECIFICATIONS STAGE RATIO RATED TORQUE (N.m)
PLF80- Planetry Gearbox  L2 422:1 200
Adapted motor DC gear motor
Rated Input Speed (rpm) 3000/min
Max Input Speed (rpm) 6000/min
Backlash L1 ≤30Arcmin
L2 ≤35Arcmin
Fault stop torque(N.m) 350
Efficiency L1 94%
L2 80%
Average life span 20000h
Operating temperature -40°~+90°
Nosie  ≤60 db
Weight (kg) L1 1.5
L2 2
IP 65
Installation method Any installation method

Planetary Gearbox Basics

If you’re in the market for a new Planetary Gearbox, you’ve come to the right place. There’s more to these mechanical wonders than just their name. Learn about Spur gears, helical gears, and various sizes. After you’ve read this article, you’ll know exactly what to look for when shopping for a new one. And you’ll also be able to avoid common mistakes made by amateur mechanics.
planetarygearbox

Wheel drive planetary gearboxes

Planetary gearboxes have numerous benefits over conventional gearboxes. Their compact design is advantageous for servo functions. Their lubrication is a key feature to maintain smooth operation and avoid damage to the gears. Some manufactures use CZPT to ensure proper functioning. These gearboxes have nearly three times the torque of traditional gearboxes while remaining compact and low in mass.
The planetary gears are made of three different types. Each type has an input and output shaft. The input and output shafts are usually coaxially arranged. The input and output shafts are connected to each other via a carrier. The carrier rotates with the planetary gears. The sun gear is the input gear and is typically 24 teeth in diameter. The outer gears are connected to the sun gear via rings of gears that are mounted around the sun gear.
Planetary gearboxes are also used in wheeled and tracked vehicles. They are also used in winch systems, which lift and lower loads. Typical applications include heavy machinery, such as cranes and earthmovers. Wheel drives are also widely used in municipal and agricultural vehicles, as well as material handling vehicles. The wheel drive is typically mounted directly into the wheel rim. A wheel drive may be fitted into two, three, or even four wheels.
A planetary gear set may be used in stages to provide different transmission rates. In order to choose the right gearbox for your application, consider the torque, backlash, and ratio you need. Then, consider the environment where the gearbox is used. Depending on its location, it might need to be protected from weather, water, and other elements. You can find a wide range of different sizes in the market.

Spur gears

There are two basic types of gearheads: planetary and spur gearheads. Each has its advantages and disadvantages depending on the application. This article will discuss the differences between these two types of gearheads. Spur gearheads are commonly used for transmission applications, while planetary gearheads are more widely used for motors. Spur gearheads are less expensive to produce than planetary gearheads, and they are more flexible in design.
There are many different types of spur gears. Among them, a 5:1 spur gear drive ratio means that the sun gear must rotate five times per revolution of the output carrier. The desired number of teeth is 24. In metric systems, the spur gears are referred to as mm and the moon gears as modules. Spur gears are used in many different types of applications, including automotive and agricultural machinery.
A planetary geartrain is a combination of ring and spur gears, which mesh with each other. There are two kinds of planetary geartrains: simple planetary gears and compound planetary gears. Spur gears are the most common type, with a sun gear and ring gear on either side of the sun. Simple planetary gears feature a single sun and ring gear, while compound planetary gears use multiple planets.
A planetary gearbox consists of two or more outer gears, which are arranged to rotate around the sun. The outer ring gear meshes with all of the planets in our solar system, while the sun gear rotates around the ring gear. Because of this, planetary gearboxes are very efficient even at low speeds. Their compact design makes them a desirable choice for space-constrained applications.
planetarygearbox

Helical gears

A planetary helical gearbox has two stages, each with its own input speed. In the study of planetary helical gear dynamics, the base circle radius and full-depth involute teeth are added to the ratio of each gear. The tangential position of the planets affects the dynamic amplifications and tooth forces. The tangential position error is an important factor in understanding the dynamic behaviour of helical planetary gears.
A helical gearbox has teeth oriented at an angle to the shaft, making them a better choice than spur gears. Helical gears also operate smoothly and quietly, while spur gears generate a thrust load during operation. Helical gears are also used in enclosed gear drives. They are the most common type of planetary gearbox. However, they can be expensive to produce. Whether you choose to use a helical or spur gearbox depends on the type of gearbox you need.
When choosing a planetary gear, it is important to understand the helix angle of the gear. The helix angle affects the way the planetary gears mesh, but does not change the fundamentals of planetary phasing. In each mesh, axial forces are introduced, which can either cancel or reinforce. The same applies to torques. So, if the ring gear is positioned at an angle of zero, helical gears will increase the axial forces.
The number of teeth on the planets is a variable parameter that must be considered in the design phase. Regardless of how many teeth are present, each planet must have a certain amount of tooth spacing to mesh properly with the ring or sun. The tip diameter is usually unknown in the conceptual design stage, but the pitch diameter may be used as an initial approximation. Asymmetrical helical gears may also cause undesirable noise.

Various sizes

There are several sizes and types of planetary gearboxes. The planetary gear sets feature the sun gear, the central gear, which is usually the input shaft, and the planet gears, which are the outer gears. A carrier connects the planet gears to the output shaft. The primary and secondary features of the planetary gearbox are important factors to consider. Besides these, there are other things to consider, such as the price, delivery time, and availability around the world. Some constructors are quicker than others in responding to inquiries. While others may be able to deliver every planetary gearbox out of stock, they will cost you more money.
The load share behavior of a planetary gearbox is comparable to that of a spur or a helical gearbox. Under low loads, individual gear meshes are slightly loaded, while other components have minimal deflections. In general, load sharing behaviour is affected mostly by assembly and manufacturing deviations. In this case, the elastic deflections help balance these effects. The load-sharing behavior of a planetary gearbox improves when the load increases.
Planetary gearboxes come in different sizes. The most common size is one with two or three planets. The size and type of the gears determine the transmission rate. Planetary gear sets come in stages. This gives you multiple transmission rate choices. Some companies offer small planetary gearboxes, while others offer larger ones. For those with special applications, make sure you check the torque, backlash, and ratio.
Whether the power is large or small, the planetary gearbox should be matched to the size of the drive. Some manufacturers also offer right-angle models. These designs incorporate other gear sets, such as a worm gear stage. Right-angle designs are ideal for situations where you need to vary the output torque. When determining the size of planetary gearboxes, make sure the drive shafts are lined up.
planetarygearbox

Applications

This report is designed to provide key information on the Global Applications of Planetary Gearbox Market, including the market size and forecast, competitive landscape, and market dynamics. The report also provides market estimates for the company segment and type segments, as well as end users. This report will also cover regional and country-level analysis, market share estimates, and mergers & acquisitions activity. The Global Applications of Planetary Gearbox Market report includes a detailed analysis of the key players in the market.
The most common application of a planetary gearbox is in the automobile industry, where it is used to distribute power between two wheels in a vehicle’s drive axle. In a four-wheel-drive car, this system is augmented by a centre differential. In hybrid electric vehicles, a summation gearbox combines the combustion engine with an electric motor, creating a hybrid vehicle that uses one single transmission system.
In the Global Industrial Planetary Gearbox Market, customer-specific planetary gears are commonly used for automated guided vehicles, intra-logistics, and agricultural technology. These gears allow for compact designs, even in tight spaces. A three-stage planetary gear can reach 300 Nm and support radial loads of 12 kN. For receiver systems, positioning accuracy is critical. A two-stage planetary gearbox was developed by CZPT. Its internal gear tension reduces torsional backlash, and manual controls are often used for high-quality signals.
The number of planetary gears is not fixed, but in industrial applications, the number of planetary gears is at least three. The more planetary gears a gearbox contains, the more torque it can transmit. Moreover, the multiple planetary gears mesh simultaneously during operation, which results in high efficiency and transmittable torque. There are many other advantages of a planetary gearbox, including reduced maintenance and high speed.

China 45#Steel Planetary Hollow Shaft Transmission High Torque Speed Reduction Planetary Gearbox     planetary gearbox definitionChina 45#Steel Planetary Hollow Shaft Transmission High Torque Speed Reduction Planetary Gearbox     planetary gearbox definition
editor by czh 2022-12-29

China Good quality Forging Hobbing Die Casting Gear Steel Metal Differential Drive Motor Slew CZPT Rack Pinion Wheel Worm Shaft Spiral Helical Spur Bevel Transmission Gears with Great quality

Merchandise Description

Solution Description

ABOUT US

     CZPT is prime producer of customized metallic components for kinds of fields. We have been in custom made steel components field for nearly 15 years, with ISO9001:2015 certification. We are specialized in production custom made precision castings and CNC machining areas according to our customers’ specs. Our Consumers selection from Europe to North The united states, which includes Leading five hundred enterprises.
     Due to constant growing of company, we invested a new building which was constructed in 2016 occupying an region of more than 3000 squaremeters. We have 2 manufacturing strains: precision metal castings and precision CNC and turning elements.
Packing and Shipping:
Typical packaging: carton, can be customized according to consumer demands
Transportation: express, sea and air freight are supported.

See below for reference:

Professional Certification:

FAQ

Q1: How Can I Get metal components Sample?

A: It is dependent on your drawings or samples. Generally for castings, we will deliver out samples right after we end toolings. And it will just take 15-twenty times.

For machining parts, it will generally take 10 times.

Q2: What is The Approach Of an Buy?

A: Send out Your Thorough Request→Feedback With Quotation→Confirm Quotation & Make Payment→Make samples→Sample Check(Acceptance)→Mass Production→Quality Checking→Delivery→After Service→Repeat Purchase

Q3: What is the Shipping and delivery Approach?

A: For samples we will send out by global specific support or by air.

For mass-generation, it is dependent on bodyweight and quantity, generally by air or by sea.

This fall: Can You Give Me Support If My Goods are Extremely Urgent?

A: Of course, Of Training course, We Will Attempt Our Greatest to Give You Help. We will make special manufacturing schedule to Create.

Q5: I Want to Maintain Our Layout in Mystery,Can We Signal NDA?

A: Positive! We Will usually Sigh NDA according to our clients’ request.

And we will not release your layout to third get together.

 

Helical, Straight-Cut, and Spiral-Bevel Gears

If you are arranging to use bevel gears in your machine, you want to comprehend the variations in between Helical, Straight-cut, and Spiral bevel gears. This write-up will introduce you to these gears, as effectively as their apps. The write-up will also go over the rewards and disadvantages of each sort of bevel equipment. As soon as you know the distinctions, you can choose the right equipment for your machine. It is easy to discover about spiral bevel gears.
equipment

Spiral bevel equipment

Spiral bevel gears enjoy a essential position in the aeronautical transmission technique. Their failure can result in devastating accidents. As a result, accurate detection and fault examination are necessary for maximizing equipment method performance. This article will examine the function of computer aided tooth make contact with examination in fault detection and meshing pinion situation errors. You can use this method to detect problems in spiral bevel gears. Further, you will understand about its application in other transmission systems.
Spiral bevel gears are developed to mesh the gear tooth much more slowly and correctly. Compared to straight bevel gears, spiral bevel gears are less costly to manufacture with CNC machining. Spiral bevel gears have a wide range of applications and can even be utilised to reduce the dimension of travel shafts and bearings. There are a lot of positive aspects to spiral bevel gears, but most of them are low-cost.
This variety of bevel gear has 3 standard aspects: the pinion-equipment pair, the load equipment, and the output shaft. Each of these is in torsion. Torsional stiffness accounts for the elasticity of the method. Spiral bevel gears are perfect for apps requiring tight backlash checking and higher-pace operations. CZPT precision machining and adjustable locknuts minimize backlash and permit for precise changes. This minimizes routine maintenance and maximizes travel lifespan.
Spiral bevel gears are useful for equally large-pace and minimal-pace apps. Substantial-velocity purposes demand spiral bevel gears for optimum efficiency and pace. They are also excellent for higher-velocity and higher torque, as they can reduce rpm without having impacting the vehicle’s pace. They are also wonderful for transferring electrical power in between two shafts. Spiral bevel gears are broadly used in automotive gears, construction products, and a variety of industrial programs.

Hypoid bevel gear

The Hypoid bevel gear is similar to the spiral bevel gear but differs in the condition of the enamel and pinion. The smallest ratio would end result in the most affordable equipment reduction. A Hypoid bevel gear is extremely durable and productive. It can be utilised in confined areas and weighs significantly less than an equivalent cylindrical gear. It is also a popular choice for large-torque applications. The Hypoid bevel equipment is a excellent decision for programs requiring a substantial level of pace and torque.
The Hypoid bevel equipment has multiple teeth that mesh with every other at the identical time. Due to the fact of this, the equipment transmits torque with very small sound. This allows it to transfer a larger torque with less sounds. Even so, it need to be famous that a Hypoid bevel equipment is usually more pricey than a spiral bevel gear. The value of a Hypoid bevel equipment is larger, but its rewards make it a common choice for some purposes.
A Hypoid bevel gear can be made of a number of kinds. They could vary in the variety of teeth and their spiral angles. In common, the smaller hypoid equipment has a bigger pinion than its counterpart. This implies that the hypoid equipment is much more successful and much better than its bevel cousin. It can even be virtually silent if it is effectively lubricated. Once you’ve got created the selection to get a Hypoid bevel gear, be sure to read up on its positive aspects.
Yet another common application for a Hypoid bevel gear is in automobiles. These gears are generally utilized in the differential in vehicles and vans. The torque transfer qualities of the Hypoid gear method make it an exceptional decision for several apps. In addition to maximizing performance, Hypoid gears also give smoothness and effectiveness. Although some folks might argue that a spiral bevel equipment set is greater, this is not an ideal resolution for most car assemblies.
gear

Helical bevel gear

Compared to helical worm gears, helical bevel gears have a small, compact housing and are structurally optimized. They can be mounted in a variety of ways and function double chamber shaft seals. In addition, the diameter of the shaft and flange of a helical bevel gear is similar to that of a worm equipment. The equipment box of a helical bevel equipment device can be as small as 1.6 inches, or as massive as eight cubic toes.
The principal attribute of helical bevel gears is that the tooth on the driver gear are twisted to the left and the helical arc gears have a equivalent design and style. In addition to the backlash, the enamel of bevel gears are twisted in a clockwise and counterclockwise path, relying on the quantity of helical bevels in the bevel. It is crucial to be aware that the tooth contact of a helical bevel gear will be lowered by about ten to twenty p.c if there is no offset between the two gears.
In buy to produce a helical bevel gear, you want to initial outline the gear and shaft geometry. After the geometry has been described, you can commence to include bosses and perforations. Then, specify the X-Y aircraft for both the gear and the shaft. Then, the cross segment of the gear will be the foundation for the sound developed right after revolution close to the X-axis. This way, you can make confident that your gear will be appropriate with the pinion.
The improvement of CNC equipment and additive producing processes has greatly simplified the production process for helical bevel gears. Right now, it is feasible to layout an unrestricted amount of bevel gear geometry employing high-tech machinery. By utilizing the kinematics of a CNC machine centre, you can generate an endless amount of gears with the excellent geometry. In the procedure, you can make each helical bevel gears and spiral bevel gears.

Straight-cut bevel equipment

A straight-reduce bevel equipment is the simplest to manufacture. The first method of production a straight bevel gear was to use a planer with an indexing head. Afterwards, much more efficient strategies of manufacturing straight bevel gears have been launched, this sort of as the Revacycle method and the Coniflex system. The latter strategy is utilised by CZPT. Right here are some of the primary positive aspects of making use of a straight-lower bevel equipment.
A straight-reduce bevel gear is defined by its teeth that intersect at the axis of the equipment when extended. Straight-reduce bevel gears are generally tapered in thickness, with the outer part getting more substantial than the internal portion. Straight-minimize bevel gears show instantaneous lines of get in touch with, and are very best suited for reduced-speed, static-load programs. A frequent application for straight-lower bevel gears is in the differential programs of cars.
Right after getting machined, straight-lower bevel gears go through warmth treatment method. Situation carburizing makes gears with surfaces of 60-sixty three Rc. Utilizing this technique, the pinion is 3 Rc tougher than the equipment to equalize use. Flare hardening, flame hardening, and induction hardening strategies are not often used. Complete machining includes turning the outer and internal diameters and special machining processes.
The enamel of a straight-lower bevel equipment encounter impact and shock loading. Since the enamel of both gears occur into contact abruptly, this sales opportunities to excessive sounds and vibration. The latter limits the speed and electrical power transmission capability of the gear. On the other hand, a spiral-minimize bevel equipment experiences gradual but considerably less-destructive loading. It can be used for higher-velocity apps, but it need to be observed that a spiral-reduce bevel equipment is far more complicated to manufacture.
equipment

Spur-cut bevel gear

CZPT shares bevel gears in spiral and straight tooth configurations, in a selection of ratios from 1.5 to five. They are also extremely remachinable other than for the teeth. Spiral bevel gears have a reduced helix angle and outstanding precision qualities. CZPT inventory bevel gears are created using state-of-the-artwork technologies and know-how. In contrast with spur-lower gears, these have a for a longer time lifestyle span.
To decide the strength and toughness of a spur-reduce bevel gear, you can estimate its MA (mechanical edge), surface toughness (SD), and tooth number (Nb). These values will vary depending on the design and style and software surroundings. You can seek the advice of the corresponding guides, white papers, and technical requirements to locate the best gear for your needs. In addition, CZPT provides a Supplier Discovery System that allows you to discover much more than five hundred,000 suppliers.
Yet another variety of spur gear is the double helical equipment. It has the two left-hand and appropriate-hand helical enamel. This layout balances thrust forces and supplies additional gear shear area. Helical gears, on the other hand, attribute spiral-reduce tooth. Whilst equally types of gears could produce considerable sound and vibration, helical gears are much more productive for high-pace apps. Spur-cut bevel gears might also trigger comparable effects.
In addition to diametral pitch, the addendum and dedendum have other crucial homes. The dedendum is the depth of the enamel below the pitch circle. This diameter is the crucial to figuring out the center distance among two spur gears. The radius of each pitch circle is equivalent to the complete depth of the spur gear. Spur gears usually use the addendum and dedendum angles to describe the enamel.

China Good quality Forging Hobbing Die Casting Gear Steel Metal Differential Drive Motor Slew CZPT Rack Pinion Wheel Worm Shaft Spiral Helical Spur Bevel Transmission Gears     with Great qualityChina Good quality Forging Hobbing Die Casting Gear Steel Metal Differential Drive Motor Slew CZPT Rack Pinion Wheel Worm Shaft Spiral Helical Spur Bevel Transmission Gears     with Great quality