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China best Agricultural Mower Parts Bevel Gearbox Transmission Motor Planetary Tiller Worm Washing Machine Gear Box Speed Reducer Stainless Steel Farm Gearbox with high quality

Product Description

            agricultural mower Parts bevel Gearbox Transmission  Motor Planetary Tiller Worm Washing Machine Gear Box Speed Reducer Stainless Steel farm gearbox

Application of bevel Gearbox

Bevel gears are used in a variety of applications, including:

  • Automotive: Bevel gears are used in the differential of a car, which allows the wheels to rotate at different speeds when the car is turning.
  • Machine tools: Bevel gears are used in machine tools, such as lathes and mills, to transmit power from the motor to the cutting tool.
  • Conveyors: Bevel gears are used in conveyors to transmit power from the motor to the conveyor belt.
  • Fans: Bevel gears are used in fans to transmit power from the motor to the fan blades.
  • Pumps: Bevel gears are used in pumps to transmit power from the motor to the pump impeller.
  • Wind turbines: Bevel gears are used in wind turbines to transmit power from the turbine blades to the generator.

Bevel gears are a type of gear that has teeth that are angled. This allows them to transmit power between shafts that are not parallel. Bevel gears are typically made of steel or cast iron, and they can be either single-stage or multi-stage. Single-stage bevel gears have 1 set of gears, while multi-stage bevel gears have 2 or more sets of gears.

Bevel gears are a versatile type of gear that can be used in a variety of applications. They are typically used in applications where there is a need to transmit power between shafts that are not parallel. Bevel gears are also used in applications where there is a need to change the direction of rotation.

 

Application: Motor, Electric Cars, Motorcycle, Machinery, Marine, Toy, Agricultural Machinery, Car
Function: Distribution Power, Clutch, Change Drive Torque, Change Drive Direction, Speed Changing, Speed Reduction, Speed Increase
Layout: Three-Ring
Hardness: Hardened Tooth Surface
Installation: Torque Arm Type
Step: Stepless
Samples:
US$ 9999/Piece
1 Piece(Min.Order)

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planetarygearbox

Benefits of a Planetary Gearbox With Output Shaft

The output shaft of a Planetary Gearbox connects to the driven wheels, while the input shaft comes from the engine. These gears are interlinked and create a wide range of gear reductions, which are necessary to get a vehicle rolling comfortably. Gear reductions are the place where the various “gears” are located. Here are some examples. They can help you determine what you need for your vehicle. You might also want to learn about planetary gears.

Planetary gearboxes

Modern cars are most likely equipped with planetary gearboxes. If you’re unsure if your vehicle uses planetary gears, you should first consult your car’s owner’s manual. If not, contact your dealership’s service department for more information. Otherwise, you can do a quick search on the internet to find out whether your car has a planetary gearbox. These gearboxes are generally more complex than ordinary gears. Additionally, they are equipped with more parts and require lubrication.
In addition to their low noise levels, planetary gearboxes are also remarkably efficient at transmission. These features make them ideal for applications requiring high torque and small footprints. Unfortunately, there are many different types of planetary gearboxes on the market, making it difficult to find the right one. The following article will give you some guidelines to help you choose the right planetary gearbox for your needs. Let’s take a look!

Planetary gears

A planetary gearbox has two main components: the sun gear (also known as the central or input) and the planet gears (also known as outer or peripheral). These gears are connected together by a carrier to the output shaft of the machine. In some applications, it is necessary to use a planetary gearbox with lubrication to prevent wear and tear. A planetary gearbox also has a small ring gear that helps hold the planet gears together.
The main advantage of a planetary gearbox is that it uses several teeth that engage at once, allowing for high-speed reduction with a small number of gears. Because the gears are relatively small, they have lower inertia than their larger counterparts. Planetary gearboxes are compact, which makes them popular for space-constrained applications. Because of their compact size and efficiency, planetary gearboxes are also commonly used in motor vehicles.

Planetary gearboxes with output shaft

For high-speed, dynamic applications, planetary gearbox units with output shaft provide the optimal solution. Thanks to their low inertia, these gearheads deliver superior performance in many industrial applications. Additionally, their wide range of variants allows users to select the perfect product for their application. This article examines some of the key benefits of planetary gearboxes with output shaft. Read on to learn more.
The planetary gearbox has two major components: a sun gear and planet gears. The sun gear is usually the input gear, while the planet gears are located at the outer edges of the system casing. Planet gears are held together by a carrier that is connected to the output shaft. Before choosing a particular gearbox for your application, make sure that you check the specific requirements and the environment to which the unit will be subjected.
A planetary gearbox has less stages of gears, and thus lower backlash compared to spur gearboxes. Backlash is lost motion that occurs when the teeth of the gears are out of perfect alignment. This problem is common in all gears, but is significantly less in planetary gearboxes. As such, planetary gearboxes are more efficient. They can also be customized according to the specific engine model and motor flange.
planetarygearbox

Planetary gearboxes with carrier

A planetary gearbox is a type of gearbox with three or more stages. They have a sun gear, which is usually the input gear, and planet gears, also called the outer gears. The carrier that connects the planet gears to the output shaft is called a ring gear. A planetary gearbox is generally designed to meet specific application and environmental requirements, but there are some factors to consider when choosing one.
The compact footprint of planetary gear sets results in high heat dissipation. This can be a problem in applications with sustained performance or high speeds. As a result, planetary gear sets often include lubricants, which present a cooling effect while also reducing noise and vibration. Some planetary gears even feature a carrier to make the installation process easier. Here are some things to keep in mind when choosing a planetary gear set.
Planetary gearboxes with carrier have several advantages over other types of gearboxes. Unlike conventional gearboxes, planetary gears have a common central shaft, and the tangential forces between the gears cancel out at the center of the ring gear. Because of this, planetary gearboxes are commonly used in input/output applications, and their compact size allows for a wide range of gear reductions. These gears can also produce higher torque density.

Planetary gearboxes with traction

Planetary gears are similar to the planetary system, in that each pinion rotates around a sun gear. The output of the planetary gear unit is lower than the drive rotation speed, but the torque is higher. As the number of planet gear wheels increases, so does the torque. Planetary gear systems contain three to four planet gears, and each is in constant mesh with the others. Power applied to any one member rotates the entire assembly.
Typical applications for planetary gear sets include high-precision motion control. In these applications, high torque, torsional stiffness, and low backlash are required. Planetary gear sets are also ideal for motors with higher speeds. A number of factors contribute to the reliability of these devices. The low backlash and large torque capacity of a planetary gear motor allow them to be used in a wide range of applications.

Planetary gearboxes with electric motors

If you’re in the market for a new gearbox, you may have already heard about planetary gearboxes. The planetary gearbox is a high-efficiency, low-noise gearbox. CZPT manufactures high-torque planetary gearboxes with low backlash. They also make economy planetary gearboxes for lower loads. However, with so many different types available, choosing the right one for your needs can be challenging.
These planetary gearboxes are a compact alternative to conventional pinion-and-gear reducers. They offer high-speed reduction and high torque transfer, and are often used for space-constrained applications. But before you can understand how they work, you’ll need to understand a little about their construction. There are a few things to look for that you may not have noticed before.
The most common type of planetary gearbox is a PM81/LN. It features a set of DC brush motors with diameter 77mm, a stator, and two or more outer gears. Each of these gears is connected to an output shaft through a carrier. They can also be used with brakes, encoders, or a clutch. A planetary gearbox is one of the most reliable gearbox types on the market.

Planetary gearboxes with hydraulic motors

A planetary gearbox is a combination of two gears, the sun and the planets. The sun gear rotates at high speed, while the planets roll around and orbit around the ring gear. The output shaft has the same direction of rotation as the input shaft. The benefits of a planetary gearbox include high reduction ratios, efficiency, space-saving compactness, and higher overload capacity. These gears are also more stable and compact, and they do not suffer from self-locking properties.
Planetary gearboxes are a highly efficient way to power hydraulic lifts. They can be input via electric, hydraulic, or air motors. The drive arrangement can be mounted on a bare shaft, splined shaft, or a parallel keyed input shaft. Depending on the application, bespoke gearboxes can be manufactured with a variety of features and functions.
planetarygearbox

Planetary gearboxes with combustion engines

There are many different applications of planetary gear sets. The most common is the distribution of power between two wheels in a car’s drive axle. Four-wheel drives use two axle differentials, which are further augmented by a centre differential. Hybrid electric vehicles use summation gearboxes to distribute power from the combustion engine to the wheels and to an electric motor. Planetary gear sets also combine the two different types of motors to form one hybrid vehicle.
To understand how planetary gear sets work, it is important to understand the underlying mechanical principles. For example, Fig. 4.6 shows a stick diagram illustrating two planetary gear sets connected by a lever. The two levers are the same length, so the system is analogous to a single lever. When calculating the torque, it is essential to consider the lever diagram. Similarly, if two gear sets are connected by vertical links, the horizontal links must be horizontal.

China best Agricultural Mower Parts Bevel Gearbox Transmission Motor Planetary Tiller Worm Washing Machine Gear Box Speed Reducer Stainless Steel Farm Gearbox   with high quality China best Agricultural Mower Parts Bevel Gearbox Transmission Motor Planetary Tiller Worm Washing Machine Gear Box Speed Reducer Stainless Steel Farm Gearbox   with high quality
editor by CX 2023-11-12

China Good quality ZD AC/DC Brush Or Brushless Vertical Type Machine Motor Planetary Gearbox efficiency of planetary gearbox

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Model Selection

                 Planetar y gearbox is a kind of reducer with wide versatility. The inner gear adopts low carbon alloy steel carburizing quenching and grinding or nitriding process. Planetary gearbox has the characteristics of small structure size, large output torque, high speed ratio, high efficiency, safe and reliable performance, etc. The inner gear of the planetary gearbox can be divided into spur gear and helical gear. 

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Our professional sales representive and technical team will choose the right model and transmission solutions for your usage depend on your specific parameters.

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If you need more product parameters, catalogues, CAD or 3D drawings, please contact us.

• On Your Need

We can modify standard products or customize them to meet your specific needs.

Range Of Planetary Gearbox

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Company Profile

Application: Motor, Machinery, Marine, Agricultural Machinery
Function: Change Drive Torque, Speed Changing, Speed Reduction
Hardness: Hardened Tooth Surface
Installation: Vertical Type
Type: Planetary Gear Box
Size: 60mm-160mm
Samples:
US$ 100/Piece
1 Piece(Min.Order)

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planetarygearbox

The Basics of a Planetary Gearbox

The basic model of a planetary gearbox is a highly efficient transmission that transmits nearly ninety percent of the power it receives. The basic planetary gearbox comes in three basic types: Inline, Helical, and Spur. Below, we will discuss the differences between each of them and which one is better for your needs. A planetary gearbox is an important part of any engine and may be the perfect choice for your vehicle.

Inline planetary gearbox

An inline planetary gearbox has an inline arrangement of gears that enables the transfer of power. Its design makes it stable and reliable, and the space and weight-saving benefits make it a popular choice for many applications. Planetary gearboxes have low inertia, high torque, and a wide range of reduction ratios, which make them a versatile choice for many industries. To find out more about this type of gearbox, read about its construction and specifications.
A planetary gearbox is composed of two parts: a sun gear (also called the central or input gear), and two planet gears (also called outer gears). These gears are connected to each other via a carrier. In order to get the best performance from your gearbox, it’s important to find a model with the features and benefits required for your application. Also, be sure to check out the delivery time, global availability, and customer service of your selected constructor. A few constructors are faster than others and have the ability to respond quickly, while others can deliver every single planetary gearbox out of stock.
Whether you’re using an inline planetary gearbox for your car’s transmission, or you’re building a new machine, it’s important to choose the right size for your application. The most common ratio is five:1, but an inline gearbox can be as high as 1000:1! The torque range is between 250-950 lb-in for continuous torque, and up to 5800 lb-in for yield torque. Some companies even offer custom shafts if you need them to fit a specific application.
Inline planetary gearboxes have a high ratio of helical rotation and are useful for applications where space is limited. Their low-backlash design allows them to handle high torques and high accelerations without backlash. Despite their compact size, planetary gear systems also have high single-stage reduction ratios, a feature that makes them ideal for a variety of industrial applications. They can also be connected for high reduction ratios.
An inline planetary gearbox can be used in many applications, from small tools to heavy industrial machinery. Its basic design includes three components: an input gear pair, an output gear pair, and a stationary position. Some planetary gearbox designs also include additional gear sets that can provide a slight offset between input and output. A planetary gearbox may also contain multiple bearings, which make the assembly more robust and reliable.
Inline planetary gear reducers are commonly used in industrial settings to slow down an electric motor. They are able to multiply torque, which means they can reduce the input speed to a level where the mechanical devices inside the motor can function properly. This type of gear reducer also has a low clearance, which makes it ideal for machines with high torque. However, you should consider the amount of torque required in your application before you make a purchase.
planetarygearbox

Helical planetary gearbox

A helical planetary gearbox is a type of mechanical system. The gears are connected by joints to the carrier that holds the planets stationary. The sun gear serves as an input to the other gears, and the planet gears rotate at a rate that depends on the number of teeth in each gear. The ratio between these gears is -Ns/Np, and the number of teeth in the ring is N r, N s, and N p.
Another type of planetary gearbox uses multiple helical axes to distribute the load. This design also offers high stiffness and low backlash, which is important for applications involving frequent start-stop cycles and rotational direction changes. It also features a compact design and low mass inertia. A helical planetary gearbox can be used for a wide range of applications. Listed below are some of the benefits of helical gear technology.
The basic design of a helical planetary gear is based on the principle of stepping planets. This concept eliminates the need for timing marks and restrictive assembly conditions. The planetary gear’s helical shape can be modified to achieve a greater transmission ratio in an equal or smaller volume. For example, a 50-T ring gear will yield the same effect as a 100-T ring gear.
In addition to the helical axis, a helical planetary gearbox also has a wide variety of secondary features that are critical to torque transmission. For instance, compact needle roller bearings are appropriate for a helical planetary gearbox because of their low-profile design and small space. However, a tapered roller bearing is better suited to handling high axial forces. In general, a helical planetary gearbox will have a higher efficiency rate and lower noise levels.
A helical planetary gearbox will have a number of components that can vary in size and shape. They will include a sun gear and many planetary parts. The central sun gear will take a low-torque input and will run multiple external gears to increase the torque and speed. This basic model of a planetary gearbox is highly efficient, transferring 97% of the power input. There are three main types of planetary gearboxes: the cylindrical planetary gearbox, the helical planetary gearbox, and the helical wormwheel.
The CZPT is a good example of an entry-level helical planetary gearbox. It is extremely reliable and aimed at providing torque in quiet applications with high precision. The Access series is another option, which is designed to meet the needs of the low-backlash planetary gearbox market. It features helical planetary gears with five to eight arc-minutes backlash, and is built on a monobloc housing.
A helical planetary gearbox is widely used in 3D printing. They are lightweight and can provide a high gear ratio. In addition to their low weight and high efficiency, some people have installed them into 3D printers to improve the accuracy of their designs. And in addition to 3D printing, helical gears are used in many industrial applications. If you’re thinking about purchasing one, you should know what the benefits are.
planetarygearbox

Spur planetary gearbox

There are many advantages to a spur planetary gearbox, from its compact design and low cost to its unmatched power transmission capacity per unit volume. Planetary gears have high efficiency per stage and can achieve up to 95% efficiency, depending on the ratio. Planet gears are mounted on a joint carrier, and the output rotation speed is slower than the drive rotation speed, which leads to increased torque. The higher the gear wheels, the more torque the unit can produce.
A spur planetary gearbox incorporates multiple other gear sets that must have helical teeth. These other gear sets must be helical, and the motor must be aligned with the driven parts. The spur gears are the most efficient type of planetary gear, as their teeth are symmetrical, which means no axial forces are generated. The difference between a spur and a planetary gearbox is its shape.
The right angle spur planetary gearbox is a versatile design with a spiral bevel gear that provides superior smoothness and quiet operation. This gearhead is case-hardened and ground to increase its efficiency. These gears can be purchased in 3-100 ratios. Spur planetary gearboxes can also have ISO rotary flanges, keyed shafts, DIN splines, or hollow compression connections.
A spur planetary gearbox utilizes spur gears around the circumference of the mechanism. The spur gears rotate between gears that have internal and external teeth. Because of this, the angular velocity of the spur gear differential carrier is the average of the ring gears and sun gears. A spur gearbox can also be considered a compound planetary gear. It is typically used for servo applications. Unlike spur gears, helical planetary gears are easier to maintain and have lower noise levels.
The most notable difference between a spur planetary gearbox and a planetary gearhead is the lubrication of the pinion and the spur gear head. A spur gear head is less complex, but cannot handle the same amount of load as a planetary gearhead. Both types can achieve the same backlash, but a planetary gearhead has better lubrication retention than a spur gear. It can run at higher speeds without excessive lubrication, while a spur gear drive is more efficient at low speeds. The reduction ratio of a planetary gearhead is near unity while that of a planetary gear head is many thousand to one.
A planetary gearbox has many applications. Plastic machinery, goods & personnel lifts, and machine tools are all prime examples of these types of gearing systems. Other industries that use these gears include wind turbines and sugar crystallizers, as well as steel and sugar mills. And of course, the use of planetary gears is not limited to these industries. It is used in many different ways, including slewing drives, mill drive, and derrick & dockyard cranes

China Good quality ZD AC/DC Brush Or Brushless Vertical Type Machine Motor Planetary Gearbox   efficiency of planetary gearboxChina Good quality ZD AC/DC Brush Or Brushless Vertical Type Machine Motor Planetary Gearbox   efficiency of planetary gearbox
editor by CX 2023-05-25

China factory Vending Machine Motor and Spiral Sets, Vending Accessory with Hot selling

Item Description

Vending Motor Technical specs:

For your reference, could do customization too.

Rated Voltage: 24V DC
No-load Existing: .16A
No-load Output Velocity: 23.5RPM
The Output Torque Max: 28.3kg. F. Cm
Output Steering: CCW
Noise (From 30cm): 75dB(A)
Weight: 135g

 

 

Synthesis of Epicyclic Equipment Trains for Automotive Computerized Transmissions

In this post, we will discuss the synthesis of epicyclic gear trains for automotive automatic transmissions, their apps, and expense. Right after you have concluded reading through, you might want to do some research on the engineering by yourself. Here are some backlinks to even more studying on this subject. They also consist of an software in hybrid automobile transmissions. Let’s search at the fundamental concepts of epicyclic gear trains. They are hugely productive and are a promising substitute to standard gearing techniques.
Gear

Synthesis of epicyclic gear trains for automotive automated transmissions

The main purpose of automotive automatic transmissions is to keep engine-drive wheel harmony. The kinematic framework of epicyclic equipment trains (EGTs) is derived from graph representations of these gear trains. The synthesis approach is based mostly on an algorithm that generates admissible epicyclic equipment trains with up to ten backlinks. This algorithm permits designers to layout vehicle gear trains that have increased efficiency and much better engine-travel wheel harmony.
In this paper, we existing a MATLAB optimization approach for deciding the gear ratios of epicyclic transmission mechanisms. We also enumerate the amount of tooth for all gears. Then, we estimate the total velocity ratios of the received EGTs. Then, we assess the feasibility of the proposed epicyclic equipment trains for automotive automated transmissions by evaluating their structural traits.
A six-hyperlink epicyclic equipment teach is depicted in the subsequent useful diagram. Each url is represented by a double-bicolor graph. The numbers on the graph represent the corresponding backlinks. Each and every link has numerous joints. This tends to make it possible for a consumer to create different configurations for every EGT. The figures on the diverse graphs have different meanings, and the identical applies to the double-bicolor determine.
In the next chapter of this write-up, we examine the synthesis of epicyclic gear trains for automotive automated transaxles. SAE International is an intercontinental business of engineers and complex authorities with core competencies in aerospace and automotive. Its charitable arm, the SAE Foundation, supports several programs and initiatives. These contain the Collegiate Style Sequence and A Globe In Motion(r) and the SAE Foundation’s A Planet in Movement(r) award.
Gear

Applications

The epicyclic gear technique is a kind of planetary gear teach. It can achieve a excellent pace reduction in a modest space. In autos, epicyclic gear trains are typically utilised for the computerized transmission. These gear trains are also valuable in hoists and pulley blocks. They have several purposes in the two mechanical and electrical engineering. They can be utilized for higher-velocity transmission and demand less area than other types of equipment trains.
The benefits of an epicyclic gear practice include its compact structure, reduced excess weight, and substantial energy density. Even so, they are not without having negatives. Equipment losses in epicyclic gear trains are a end result of friction in between gear tooth surfaces, churning of lubricating oil, and the friction in between shaft help bearings and sprockets. This reduction of power is known as latent power, and previous study has demonstrated that this decline is remarkable.
The epicyclic equipment teach is frequently utilized for substantial-speed transmissions, but it also has a tiny footprint and is appropriate for a assortment of apps. It is used as differential gears in speed frames, to push bobbins, and for the Roper positive enable-off in looms. In addition, it is straightforward to fabricate, generating it an excellent decision for a range of industrial settings.
An additional case in point of an epicyclic gear practice is the planetary equipment teach. It is made up of two gears with a ring in the middle and the sunshine gear in the outer ring. Each and every gear is mounted so that its centre rotates around the ring of the other equipment. The planet equipment and solar gear are made so that their pitch circles do not slip and are in sync. The world gear has a point on the pitch circle that traces the epicycloid curve.
This gear method also provides a reduced MTTR than other types of planetary gears. The primary downside of these equipment sets is the big number of bearings they need to have to run. Furthermore, planetary gears are much more maintenance-intensive than parallel shaft gears. This can make them much more hard to keep track of and fix. The MTTR is also reduce in comparison to parallel shaft gears. They can also be a minor off on their axis, causing them to misalign or drop their performance.
An additional case in point of an epicyclic gear teach is the differential equipment box of an automobile. These gears are employed in wrist watches, lathe machines, and automotives to transmit electrical power. In addition, they are utilised in a lot of other programs, which includes in aircrafts. They are peaceful and sturdy, producing them an excellent choice for many applications. They are used in transmission, textile equipment, and even aerospace. A pitch point is the path between two tooth in a equipment established. The axial pitch of 1 gear can be elevated by rising its foundation circle.
An epicyclic gear is also recognized as an involute equipment. The variety of enamel in each equipment establishes its price of rotation. A 24-tooth sun equipment creates an N-tooth planet equipment with a ratio of 3/2. A 24-tooth sunshine gear equals a -3/2 world gear ratio. For that reason, the epicyclic gear system supplies higher torque for driving wheels. Nevertheless, this gear train is not widely utilized in automobiles.
Gear

Price

The expense of epicyclic gearing is lower when they are tooled fairly than manufactured on a normal N/C milling machine. The epicyclic carriers need to be created in a casting and tooled making use of a one-purpose machine that has several cutters to reduce the substance at the same time. This strategy is commonly employed for industrial applications and is specifically useful in the automotive sector. The advantages of a properly-manufactured epicyclic equipment transmission are several.
An instance of this is the planetary arrangement exactly where the planets orbit the sunshine whilst rotating on its shaft. The resulting speed of each equipment relies upon on the quantity of enamel and the pace of the carrier. Epicyclic gears can be tricky to calculate relative speeds, as they need to figure out the relative velocity of the sun and the world. The fastened sunshine is not at zero RPM at mesh, so the relative speed should be calculated.
In purchase to decide the mesh electricity transmission, epicyclic gears should be made to be capable to “float.” If the tangential load is way too reduced, there will be much less load sharing. An epicyclic equipment have to be capable to allow “float.” It must also permit for some tangential load and pitch-line velocities. The larger these elements, the more effective the gear set will be.
An epicyclic gear train is composed of two or much more spur gears put circumferentially. These gears are organized so that the world gear rolls within the pitch circle of the fastened outer gear ring. This curve is named a hypocycloid. An epicyclic gear teach with a world partaking a sunlight equipment is called a planetary equipment practice. The sun equipment is fixed, even though the earth equipment is pushed.
An epicyclic gear prepare includes numerous meshes. Every gear has a distinct variety of meshes, which interprets into RPM. The epicyclic equipment can enhance the load software frequency by translating input torque into the meshes. The epicyclic gear teach consists of 3 gears, the solar, world, and ring. The sunshine equipment is the centre equipment, while the planets orbit the solar. The ring gear has numerous tooth, which raises the equipment velocity.
One more kind of epicyclic equipment is the planetary gearbox. This gear box has multiple toothed wheels rotating close to a central shaft. Its lower-profile design and style can make it a common choice for place-constrained programs. This gearbox sort is utilised in automatic transmissions. In addition, it is used for several industrial uses involving electric equipment motors. The type of gearbox you use will count on the speed and torque of the enter and output shafts.

China factory Vending Machine Motor and Spiral Sets, Vending Accessory     with Hot sellingChina factory Vending Machine Motor and Spiral Sets, Vending Accessory     with Hot selling