In 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 program. This is how planetary gears acquired their name.
The elements of a planetary gear train can be split into four main constituents.
The housing with integrated internal teeth is known as a ring gear. In nearly all cases the housing is fixed. The generating sun pinion is certainly in the heart of the ring gear, and is coaxially organized in relation to the output. Sunlight pinion is usually attached to a clamping system in order to provide the mechanical connection to the electric motor shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between the sun pinion and the band equipment. The planetary carrier also represents the output shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the required torque. The number of teeth has no effect on the tranny ratio of the gearbox. The number of planets can also vary. As the amount of planetary gears improves, the distribution of the strain increases and therefore the torque which can be transmitted. Raising the number of tooth engagements also reduces the rolling power. Since just portion of the total output needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The advantage of a planetary equipment compared to a single spur gear lies in this load distribution. It is therefore feasible to transmit high torques wit
h high efficiency with a compact design using planetary gears.
So long as the ring gear has a constant size, different ratios can be realized by varying the amount of teeth of sunlight gear and the number of tooth of the planetary gears. Small the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is usually 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 obtained by connecting several planetary levels in series in the same ring gear. In this case, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a band gear that’s not set but is driven in virtually any direction of rotation. It is also possible to fix the drive shaft to be able to grab the torque via the band gear. Planetary gearboxes have grown to be extremely important in many regions of mechanical engineering.
They have become particularly well established in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios may also easily be achieved with planetary gearboxes. Because of their positive properties and compact design, the gearboxes have 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 due to low rolling power
Nearly unlimited transmission ratio options due to mixture of several planet stages
Suitable as planetary switching gear due to fixing this or that section of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for an array of applications
Epicyclic gearbox is an automatic type gearbox where parallel shafts and gears arrangement from manual gear box are replaced with more compact and more dependable sun and planetary type of gears arrangement and also the manual clutch from manual power train can be replaced with hydro coupled clutch or torque convertor which in turn made the transmission automatic.
The idea of epicyclic gear box is extracted from the solar system which is considered to an ideal arrangement of objects.
The epicyclic gearbox usually comes with the P N R D S (Parking, Neutral, Reverse, Drive, Sport) settings which is obtained by fixing of sun and planetary gears according to the need of the drive.
Ever-Power Planetary Gear Motors are an inline remedy providing high torque at low speeds. Our Planetary Gear Motors offer a high efficiency and provide excellent torque output in comparison with other types of gear motors. They can deal with a different load with reduced backlash and are greatest for intermittent duty procedure. With endless reduction ratio options, voltages, and sizes, Ever-Power Products has a fully tailored equipment motor alternative for you.
A Planetary Gear Motor from Ever-Power Products features one of our numerous kinds of DC motors coupled with one of our uniquely designed epicyclic or planetary gearheads. A planetary gearhead contains an internal gear (sun gear) that drives multiple external gears (planet gears) generating torque. Multiple contact factors over the planetary gear teach permits higher torque generation compared to one of our spur gear motors. Subsequently, an Ever-Power planetary gear motor has the ability to handle numerous load requirements; the more equipment stages (stacks), the bigger the load 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 effectiveness in a concise, low noise style. These characteristics in addition to our value-added features makes Ever-Power s equipment motors a great 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 Automobiles (AGV)
In 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 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 program. This is how planetary gears obtained their name.
The parts of a planetary gear train can be split into four main constituents.
The housing with integrated internal teeth is known as a ring gear. In nearly all cases the casing is fixed. The generating sun pinion is certainly in the center of the ring equipment, and is coaxially arranged with regards to the output. Sunlight pinion is usually attached to a clamping system in order to offer the mechanical connection to the electric motor shaft. During operation, the planetary gears, which are installed on a planetary carrier, roll between the sun pinion and the ring equipment. The planetary carrier also represents the output shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the required torque. The number of teeth does not have any effect on the transmitting ratio of the gearbox. The amount of planets may also vary. As the amount of planetary gears raises, the distribution of the strain increases and then the torque that can be transmitted. Raising the amount of tooth engagements also decreases the rolling power. Since just portion of the total result has to be transmitted as rolling power, a planetary equipment is extremely efficient. The advantage of a planetary equipment compared to an individual spur gear lies in this load distribution. Hence, it is feasible to transmit high torques wit
h high efficiency with a compact design using planetary gears.
So long as the ring gear includes a constant size, different ratios can be realized by various the number of teeth of the sun gear and the amount of teeth of the planetary gears. Small the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is usually approx. 3:1 to 10:1, because the planetary gears and sunlight gear are extremely little above and below these ratios. Higher ratios can be obtained by connecting many planetary stages in series in the same band gear. In this case, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a ring gear that’s not fixed but is driven in any direction of rotation. It is also possible to fix the drive shaft to be able to grab the torque via the ring gear. Planetary gearboxes have become extremely important in many areas of mechanical engineering.
They have grown to be particularly well established in areas where high output levels and fast speeds must be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios may also easily be performed with planetary gearboxes. Because of their 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 combination of several planet stages
Ideal as planetary switching gear due to fixing this or that portion of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
On the surface, it may seem that gears are being “reduced” in quantity or size, which is partially true. Whenever a rotary machine such as an engine or electric motor needs the result speed reduced and/or torque increased, gears are commonly used to accomplish the desired result. Gear “reduction” particularly refers to the swiftness of the rotary machine; the rotational velocity of the rotary machine is definitely “decreased” by dividing it by a gear ratio higher than 1:1. A gear ratio greater than 1:1 can be achieved when a smaller gear (reduced size) with fewer number of the teeth meshes and drives a larger gear with greater number of teeth.
Gear reduction gets the opposite effect on torque. The rotary machine’s result torque is improved by multiplying the torque by the apparatus ratio, less some performance losses.
While in many applications gear reduction reduces speed and boosts torque, in additional applications gear decrease is used to increase swiftness and reduce torque. Generators in wind turbines use gear decrease in this manner to convert a relatively slow turbine blade swiftness to a higher speed capable of producing electricity. These applications use gearboxes that are assembled opposite of those in applications that reduce rate and increase torque.
How is gear reduction achieved? Many reducer types can handle attaining gear reduction including, but not limited by, parallel shaft, planetary and right-angle 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 greater number of teeth. The “decrease” or gear ratio can be calculated by dividing the number of tooth on the large gear by the amount of teeth on the small gear. For example, if an electric motor drives a 13-tooth pinion equipment that meshes with a 65-tooth gear, a reduction of 5:1 is achieved (65 / 13 = 5). If the electrical motor speed is usually 3,450 rpm, the gearbox reduces this swiftness by five times to 690 rpm. If the motor torque is certainly 10 lb-in, the gearbox raises this torque by a factor of five to 50 lb-in (before subtracting out gearbox efficiency losses).
Parallel shaft gearboxes often contain multiple gear units thereby increasing the gear reduction. The 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 pieces, the total ratio is 60:1 (3 x 4 x 5 = 60). In our example above, the 3,450 rpm electric engine would have its quickness decreased to 57.5 rpm by using a 60:1 gearbox. The 10 lb-in electric motor torque would be increased to 600 lb-in (before performance losses).
If a pinion gear and its mating gear have the same amount of teeth, no reduction occurs and the gear ratio is 1:1. The apparatus is called an idler and its own major function is to improve the path of rotation rather than decrease the speed or boost the torque.
Calculating the apparatus ratio in a planetary gear reducer is less intuitive since it is dependent upon the amount of teeth of the sun and band gears. The planet gears act as idlers , nor affect the gear ratio. The planetary equipment ratio equals the sum of the amount of teeth on the sun and ring equipment divided by the amount of teeth on the sun gear. For example, a planetary arranged with a 12-tooth sun gear and 72-tooth ring gear has a gear ratio of 7:1 ([12 + 72]/12 = 7). Planetary gear models can achieve ratios from about 3:1 to about 11:1. If more gear reduction is necessary, additional planetary stages can be used.
The gear decrease in a right-angle worm drive is dependent on the number of threads or “starts” on the worm and the amount of teeth on the mating worm wheel. If the worm has two starts and the mating worm wheel offers 50 tooth, the resulting equipment ratio is 25:1 (50 / 2 = 25).
Whenever a rotary machine such as an engine or electric electric motor cannot provide the desired output quickness or torque, a equipment reducer may provide a good solution. Parallel shaft, planetary, right-angle worm drives are normal gearbox types for achieving gear reduction. Get in touch with Groschopp today with all your gear reduction questions.