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epicyclic gearbox

Within an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference operate between a gear with internal teeth and a gear with exterior teeth on a concentric orbit. The circulation of the spur gear takes place in analogy to the orbiting of the planets in the solar system. This is how planetary gears acquired their name.
The elements of a planetary gear train can be divided into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In the majority of cases the casing is fixed. The driving sun pinion is usually in the center of the ring gear, and is coaxially organized in relation to the output. Sunlight pinion is usually mounted on a clamping system in order to provide the mechanical link with the motor shaft. During operation, the planetary gears, which are installed on a planetary carrier, roll between your sun pinion and the ring equipment. The planetary carrier also represents the result shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the mandatory torque. The amount of teeth has no effect on the transmitting ratio of the gearbox. The number of planets may also vary. As the number of planetary gears boosts, the distribution of the load increases and therefore the torque that can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since only area of the total result needs to be transmitted as rolling power, a planetary equipment is extremely efficient. The benefit of a planetary equipment compared to an individual spur gear is based on this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a concise style using planetary gears.
Provided that the ring gear includes a continuous size, different ratios can be realized by various the amount of teeth of the sun gear and the number of tooth of the planetary gears. Small the sun gear, the greater the ratio. Technically, a meaningful ratio range for a planetary stage is definitely approx. 3:1 to 10:1, because the planetary gears and the sun gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting a number of planetary phases in series in the same ring gear. In cases like this, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a band gear that’s not fixed but is driven in virtually any direction of rotation. Additionally it is possible to fix the drive shaft to be able to grab the torque via the band equipment. Planetary gearboxes have become extremely important in many regions of mechanical engineering.
They have grown to be particularly well established in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High transmission ratios may also easily be achieved with planetary gearboxes. Because of the positive properties and small design, the gearboxes possess many potential uses in industrial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to many planetary gears
High efficiency because of low rolling power
Almost unlimited transmission ratio options because of mixture of several planet stages
Suitable as planetary switching gear due to fixing this or that part of the gearbox
Chance for use as overriding gearbox
Favorable volume output
Suitability for a wide variety of applications
Epicyclic gearbox can be an automatic type gearbox in which parallel shafts and gears arrangement from manual equipment box are replaced with more compact and more dependable sun and planetary type of gears arrangement as well as the manual clutch from manual power teach is usually replaced with hydro coupled clutch or torque convertor which in turn made the transmission automatic.
The thought of epicyclic gear box is extracted from the solar system which is known as to an ideal arrangement of objects.
The epicyclic gearbox usually includes the P N R D S (Parking, Neutral, Invert, Drive, Sport) modes which is obtained by fixing of sun and planetary gears based on the need of the drive.
Ever-Power Planetary Equipment Motors are an inline answer providing high torque in low speeds. Our Planetary Gear Motors provide a high efficiency and offer excellent torque output in comparison with other types of gear motors. They can deal with a varying load with reduced backlash and are greatest for intermittent duty procedure. With endless reduction ratio choices, voltages, and sizes, Ever-Power Products includes a fully tailored equipment motor solution for you.
A Planetary Gear Electric motor from Ever-Power Items features among our various types of DC motors in conjunction with one of our uniquely designed epicyclic or planetary gearheads. A planetary gearhead includes an interior gear (sun gear) that drives multiple external gears (planet gears) generating torque. Multiple contact factors across the planetary gear teach permits higher torque generation in comparison to one of our spur equipment motors. In turn, an Ever-Power planetary equipment motor has the ability to handle numerous load requirements; the more gear stages (stacks), the bigger the strain distribution and torque transmitting.
Features and Benefits
High Torque Capabilities
Sleek Inline Design
High Efficiency
Ability to Handle Large Reduction Ratios
High Power Density
Applications
Our Planetary Gear Motors deliver exceptional torque result and performance in a concise, low noise design. These characteristics in addition to our value-added features makes Ever-Power s gear motors a fantastic choice for all motion control applications.
Robotics
Industrial Automation
Dental Chairs
Rotary Tables
Pool Chair Lifts
Exam Room Tables
Massage Chairs
Packaging Eqipment
Labeling Eqipment
Laser Cutting Machines
Industrial Textile Machinery
Conveying Systems
Test & Measurement Equipment
Automated Guided Vehicles (AGV)
Within an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a gear with external teeth on a concentric orbit. The circulation of the spur gear takes place in analogy to the orbiting of the planets in the solar program. This is one way planetary gears obtained their name.
The parts of a planetary gear train could be split into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In the majority of cases the housing is fixed. The generating sun pinion is definitely in the heart of the ring equipment, and is coaxially arranged with regards to the output. Sunlight pinion is usually attached to a clamping system to be able to provide the mechanical connection to the engine shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sunlight pinion and the ring equipment. The planetary carrier also represents the result shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the mandatory torque. The number of teeth does not have any effect on the transmitting ratio of the gearbox. The number of planets may also vary. As the number of planetary gears improves, the distribution of the load increases and therefore the torque which can be transmitted. Increasing the amount of tooth engagements also reduces the rolling power. Since only area of the total result has to be transmitted as rolling power, a planetary equipment is extremely efficient. The benefit of a planetary gear compared to an individual spur gear lies in this load distribution. Hence, it is possible to transmit high torques wit
h high efficiency with a concise style using planetary gears.
So long as the ring gear includes a constant size, different ratios can be realized by different the number of teeth of the sun gear and the amount of teeth of the planetary gears. The smaller the sun equipment, the greater the ratio. Technically, a meaningful ratio range for a planetary stage is certainly approx. 3:1 to 10:1, since the planetary gears and the sun gear are extremely small above and below these ratios. Higher ratios can be obtained by connecting many planetary stages in series in the same band gear. In this instance, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a band gear that is not fixed but is driven in virtually any direction of rotation. Additionally it is possible to fix the drive shaft in order to grab the torque via the band gear. Planetary gearboxes have grown to be extremely important in lots of areas of mechanical engineering.
They have grown to be particularly well established in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High transmission ratios may also easily be achieved with planetary gearboxes. Because of their positive properties and compact design, the gearboxes possess many potential uses in industrial applications.
The benefits of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to several planetary gears
High efficiency because of low rolling power
Nearly unlimited transmission ratio options because of mixture of several planet stages
Suitable as planetary switching gear because of fixing this or that area of the gearbox
Chance for use as overriding gearbox
Favorable volume output
On the surface, it could seem that gears are being “reduced” in quantity or size, which is partially true. When a rotary machine such as for example an engine or electrical motor needs the output speed decreased and/or torque improved, gears are commonly used to accomplish the required result. Gear “reduction” particularly refers to the rate of the rotary machine; the rotational rate of the rotary machine is definitely “decreased” by dividing it by a gear ratio greater than 1:1. A gear ratio greater than 1:1 is certainly achieved when a smaller gear (decreased size) with fewer quantity of tooth meshes and drives a larger gear with greater amount of teeth.
Gear reduction has the opposite influence on torque. The rotary machine’s result torque is improved by multiplying the torque by the gear ratio, less some performance losses.
While in lots of applications gear reduction reduces speed and boosts torque, in various other applications gear decrease is used to improve velocity and reduce torque. Generators in wind turbines use gear decrease in this fashion to convert a relatively slow turbine blade swiftness to a high speed capable of producing electricity. These applications use gearboxes that are assembled reverse of these in applications that decrease rate and increase torque.
How is gear reduction achieved? Many reducer types can handle attaining gear decrease including, but not limited to, parallel shaft, planetary and right-position worm gearboxes. In parallel shaft gearboxes (or reducers), a pinion equipment with a certain number of teeth meshes and drives a larger gear with a lot more teeth. The “decrease” or equipment ratio is calculated by dividing the number of tooth on the large gear by the amount of teeth on the small gear. For instance, if a power motor drives a 13-tooth pinion gear that meshes with a 65-tooth gear, a reduction of 5:1 is certainly achieved (65 / 13 = 5). If the electrical motor speed can be 3,450 rpm, the gearbox reduces this swiftness by five situations to 690 rpm. If the engine torque is definitely 10 lb-in, the gearbox boosts this torque by a factor of five to 50 lb-in (before subtracting out gearbox effectiveness losses).
Parallel shaft gearboxes many times contain multiple gear models thereby increasing the apparatus reduction. The full total gear decrease (ratio) is determined by multiplying each individual equipment ratio from each gear established stage. If a gearbox includes 3:1, 4:1 and 5:1 gear models, the total ratio is 60:1 (3 x 4 x 5 = 60). Inside our example above, the 3,450 rpm electric electric motor would have its quickness reduced to 57.5 rpm by utilizing a 60:1 gearbox. The 10 lb-in electric electric motor torque would be risen to 600 lb-in (before efficiency losses).
If a pinion equipment and its mating gear have the same quantity of teeth, no decrease occurs and the gear ratio is 1:1. The apparatus is called an idler and its own primary function is to improve the path of rotation instead of decrease the speed or raise the torque.
Calculating the gear ratio in a planetary equipment reducer is less intuitive as it is dependent on the amount of teeth of sunlight and band gears. The planet gears act as idlers and don’t affect the apparatus ratio. The planetary equipment ratio equals the sum of the number of teeth on the sun and ring equipment divided by the number of teeth on sunlight gear. For example, a planetary set with a 12-tooth sun gear and 72-tooth ring gear includes a gear ratio of 7:1 ([12 + 72]/12 = 7). Planetary gear sets can achieve ratios from about 3:1 to about 11:1. If more gear reduction is necessary, additional planetary stages may be used.
The gear decrease in a right-angle worm drive is dependent on the amount of threads or “starts” on the worm and the amount of teeth on the mating worm wheel. If the worm has two begins and the mating worm wheel has 50 teeth, the resulting equipment ratio is 25:1 (50 / 2 = 25).
When a rotary machine such as for example an engine or electric engine cannot provide the desired output quickness or torque, a equipment reducer may provide a good solution. Parallel shaft, planetary, right-position worm drives are common gearbox types for achieving gear reduction. Contact Groschopp today with all of your gear reduction questions.

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