An assembly of meshed gears consisting of a central or sun equipment, a coaxial internal or ring equipment, and a number of intermediate pinions supported on a revolving carrier. Sometimes the term planetary gear train is utilized broadly as a synonym for epicyclic gear train, or narrowly to indicate that the ring equipment is the fixed member. In a simple planetary gear train the pinions mesh concurrently with both coaxial gears (observe illustration). With the central equipment fixed, a pinion rotates about it as a world rotates about its sun, and the gears are named appropriately: the central gear is the sun, and the pinions will be the planets.
This is a concise, ‘single’ stage planetary gearset where the output comes from a second ring gear varying a few teeth from the primary.
With the initial style of 18 sun teeth, 60 band teeth, and 3 planets, this led to a ‘single’ stage gear reduced amount of -82.33:1.
A regular planetary gearset of this size would have a reduction ratio of 4.33:1.
That is a good deal of torque in a small package.
At Nominal Voltage
Voltage (Nominal) 12V
Voltage Range (Recommended) 3V – 12V
Speed (No Load)* 52 rpm
Current (No Load)* 0.21A
Current (Stall)* 4.9A
Torque (Stall)* 291.6 oz-in (21 kgf-cm)
Gear Ratio 231:1
Gear Material Metal
Gearbox Style Planetary
Motor Type DC
Output Shaft Diameter 4mm (0.1575”)
Output Shaft Style D-shaft
Result Shaft Support Dual Ball Bearing
Electrical Connection Male Spade Terminal
Operating Temperature -10 ~ +60°C
Installation Screw Size M2 x 0.4mm
Product Weight 100g (3.53oz)
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 exterior teeth on a concentric orbit. The circulation of the spur gear occurs in analogy to the orbiting of the planets in the solar program. This is how planetary gears acquired their name.
The parts of a planetary gear train can 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 certainly in the heart of the ring equipment, and is coaxially arranged in relation to the output. The sun pinion is usually mounted on a clamping system to be able to offer the mechanical link with the electric motor shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between your sun pinion and the ring gear. The planetary carrier also represents the result shaft of the gearbox.
The sole reason for the planetary gears is to transfer the mandatory torque. The amount 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 boosts, the distribution of the load increases and then the torque which can be transmitted. Increasing the amount of tooth engagements also decreases the rolling power. Since just section of the total output needs to be transmitted as rolling power, a planetary gear 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 Planetary Gear Transmission efficiency with a concise style using planetary gears.
So long as the ring gear has a continuous size, different ratios can be realized by various the number of teeth of the sun gear and the number of tooth of the planetary gears. Small the sun equipment, the greater the ratio. Technically, a meaningful ratio range for a planetary stage is approx. 3:1 to 10:1, since the planetary gears and sunlight gear are extremely little above and below these ratios. Higher ratios can be obtained by connecting several planetary levels in series in the same ring gear. In this instance, 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. Additionally it is possible to repair the drive shaft to be able to grab the torque via the ring equipment. Planetary gearboxes have grown to be extremely important in many regions of mechanical engineering.
They have grown to be particularly more developed in areas where high output levels and fast speeds must be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios can also easily be achieved with planetary gearboxes. Because of the positive properties and small design, the gearboxes have many potential uses in commercial applications.
The benefits of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to several planetary gears
High efficiency due to low rolling power
Nearly unlimited transmission ratio options because of mixture of several planet stages
Ideal as planetary switching gear due to fixing this or that section of the gearbox
Chance for use as overriding gearbox
Favorable volume output
Suitability for an array of applications
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 exterior teeth on a concentric orbit. The circulation of the spur equipment takes place in analogy to the orbiting of the planets in the solar program. This is one way planetary gears obtained their name.
The components 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 the majority of cases the casing is fixed. The traveling sun pinion can be in the heart of the ring gear, and is coaxially arranged in relation to the output. Sunlight pinion is usually attached to a clamping system to be able to provide the mechanical link with the motor shaft. During operation, the planetary gears, which are installed on a planetary carrier, roll between your sunlight pinion and the ring gear. 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 amount of teeth does not have any effect on the transmitting ratio of the gearbox. The amount of planets can also vary. As the amount of planetary gears increases, 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 section of the total output has to be transmitted as rolling power, a planetary gear is extremely efficient. The advantage of a planetary equipment compared to a single spur gear lies in this load distribution. Hence, it is feasible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
So long as the ring gear has a continuous size, different ratios can be realized by various the amount of teeth of the sun gear and the number of teeth of the planetary gears. The smaller the sun gear, 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 sunlight gear are extremely little above and below these ratios. Higher ratios can be acquired by connecting many planetary stages in series in the same ring gear. In cases like this, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a ring gear that is not set but is driven in virtually any direction of rotation. It is also possible to repair the drive shaft in order to grab the torque via the band 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 transmission ratios may also easily be achieved with planetary gearboxes. Because of their positive properties and compact design, the gearboxes have many potential uses in commercial 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
Almost unlimited transmission ratio options because of combination of several planet stages
Appropriate as planetary switching gear because of fixing this or that section of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for a wide selection of applications
Epicyclic gearbox can be an automatic type gearbox in which parallel shafts and gears set up from manual gear box are replaced with more compact and more dependable sun and planetary kind of gears arrangement as well as the manual clutch from manual power teach is 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, Invert, Drive, Sport) settings which is obtained by fixing of sun and planetary gears according to the require of the drive.
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 obtained 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 nearly all cases the casing is fixed. The generating sun pinion is in the center of the ring gear, and is coaxially organized with regards to the output. Sunlight pinion is usually mounted on a clamping system to be able to provide the mechanical connection to the engine shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between the sunlight pinion and the band equipment. The planetary carrier also represents the result 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 amount of planets can also vary. As the amount of planetary gears boosts, the distribution of the load increases and then the torque which can be transmitted. Raising the number of tooth engagements also reduces the rolling power. Since just part 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 is based on this load distribution. Hence, it is feasible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
Provided that the ring gear includes a constant size, different ratios can be realized by varying the number of teeth of sunlight gear and the amount of teeth of the planetary gears. The smaller the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage can be approx. 3:1 to 10:1, since the planetary gears and the sun gear are extremely little above and below these ratios. Higher ratios can be obtained by connecting a number of planetary phases in series in the same ring gear. In cases like this, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a band gear that’s not set 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 ring equipment. 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 must be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios may also easily be achieved with planetary gearboxes. Because of the positive properties and small design, the gearboxes have many potential uses in industrial applications.
The benefits of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to many planetary gears
High efficiency because of low rolling power
Nearly unlimited transmission ratio options due to combination of several planet stages
Appropriate as planetary switching gear due to fixing this or that area of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be performed with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth share the load also enables planetary gears to transmit high levels of torque. The combination of compact size, huge speed reduction and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing can make them a more expensive option than other gearbox types. And precision production is extremely important for these gearboxes. If one planetary gear is put closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the compact footprint of planetary gears makes heat dissipation more difficult, therefore applications that operate at high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with each other, although manufacturers provide right-angle designs that incorporate other gear sets (frequently bevel gears with helical tooth) to provide an offset between the input and output.
Input power (max)27 kW (36 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)12,880 Nm(9,500 lb-ft)
Output torque (continuous)8,135 Nm (6,000 lb-ft)
1 Actual ratio is dependent on the drive configuration.
2 Max input speed related to ratio and max output speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable with all ratios)
Approximate dry weight100 -181 kg (220 – 400 lb)4
Radial load (max)14,287kg (31,500 lb)3
Drive typeSpeed reducer
Hydraulic motor input SAE C or D hydraulic
A planetary transmission system (or Epicyclic system since it can be known), consists normally of a centrally pivoted sun gear, a ring equipment and several world gears which rotate between these.
This assembly concept explains the term planetary transmission, as the earth gears rotate around the sun gear as in the astronomical sense the planets rotate around our sun.
The benefit of a planetary transmission depends upon load distribution over multiple planet gears. It is thereby possible to transfer high torques utilizing a compact design.
Gear assembly 1 and gear assembly 2 of the Ever-Power 500/14 have two selectable sun gears. The first equipment step of the stepped world gears engages with sunlight gear #1. The next equipment step engages with sun gear #2. With sun gear one or two 2 coupled to the axle,or the coupling of sunlight equipment 1 with the ring gear, three ratio variations are achievable with each equipment assembly.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment selected in gear assy (1) or (2), sunlight gear 1 is coupled with the ring equipment in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and ring gear then rotate with each other at the same rate. The stepped planet gears usually do not unroll. Thus the gear ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sunlight gear 3 and ring gear 3 are directly coupled.
Many “gears” are used for automobiles, but they are also utilized for many additional machines. The most frequent one is the “transmission” that conveys the energy of engine to tires. There are broadly two roles the transmission of an automobile plays : one can be to decelerate the high rotation rate emitted by the engine to transmit to tires; the additional is to improve the reduction ratio relative to the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the general state of driving amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is not possible to rotate tires with the same rotation speed to run, it is necessary to lower the rotation speed using the ratio of the number of gear teeth. This kind of a role is called deceleration; the ratio of the rotation swiftness of engine and that of wheels is called the reduction ratio.
Then, exactly why is it necessary to change the reduction ratio relative to the acceleration / deceleration or driving speed ? The reason being substances need a large force to start moving however they usually do not require such a sizable force to excersice once they have started to move. Automobile can be cited as an example. An engine, nevertheless, by its character can’t so finely alter its output. Therefore, one adjusts its output by changing the reduction ratio employing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of the teeth of gears meshing with one another can be deemed as the ratio of the space of levers’ arms. That’s, if the reduction ratio is large and the rotation rate as output is lower in comparison compared to that as insight, the energy output by transmission (torque) will be large; if the rotation velocity as output is not so lower in comparison compared to that as input, however, the energy output by transmission (torque) will be little. Thus, to improve the decrease ratio utilizing tranny is much akin to the basic principle of moving things.
Then, how does a transmission alter the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear system is a gear mechanism comprising 4 components, namely, sunlight gear A, several world gears B, internal gear C and carrier D that connects world gears as seen in the graph below. It includes a very complex structure rendering its design or production most difficult; it can understand the high decrease ratio through gears, nevertheless, it is a mechanism suited to a reduction mechanism that requires both little size and powerful such as transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the quickness transducer of the gearbox to reduce the turnover quantity of the engine to the required one and get a huge torque. How really does a planetary gearbox work? We are able to find out more about it from the framework.
The primary transmission structure of the planetary gearbox is planet gears, sun gear and band gear. The ring gear is positioned in close get in touch with with the internal gearbox case. Sunlight equipment driven by the exterior power lies in the center of the ring equipment. Between the sun gear and ring gear, there exists a planetary equipment set consisting of three gears similarly built-up at the earth carrier, which is floating among them relying on the support of the result shaft, ring equipment and sun equipment. When sunlight gear is usually actuated by the insight power, the planet gears will be powered to rotate and then revolve around the guts together with the orbit of the ring equipment. The rotation of the earth gears drives the result shaft connected with the carrier to output the power.
Planetary speed reducer applications
Planetary speed reducers & gearboxes have a whole lot of advantages, like small size, light weight, high load capability, lengthy service life, high reliability, low noise, large output torque, wide variety of speed ratio, high efficiency and so forth. Besides, the planetary speed reducers gearboxes in Ever-Power are created for square flange, which are easy and easy for installation and suitable for AC/DC servo motors, stepper motors, hydraulic motors etc.
Due to these advantages, planetary gearboxes are applicable to the lifting transportation, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light and textile industry, medical equipment, device and gauge, vehicle, ships, weapons, aerospace and other commercial sectors.
The primary reason to use a gearhead is that it makes it possible to control a large load inertia with a comparatively small motor inertia. Without the gearhead, acceleration or velocity control of the load would require that the electric motor torque, and therefore current, would need to be as much times greater as the decrease ratio which is used. Moog offers a selection of windings in each frame size that, combined with an array of reduction ratios, offers an range of solution to output requirements. Each combination of motor and gearhead offers unique advantages.
Precision Planetary Gearheads
gearheads
32 mm Low Cost Planetary Gearhead
32 mm Precision Planetary Gearhead
52 mm Precision Planetary Gearhead
62 mm Precision Planetary Gearhead
81 mm Precision Planetary Gearhead
120 mm Precision Planetary Gearhead
Planetary gearheads are suitable for transmitting high torques of up to 120 Nm. Generally, the larger gearheads come with ball bearings at the gearhead output.
Properties of the Ever-Power planetary gearhead:
– For transmitting of high torques up to 180 Nm
– Reduction ratios from 4:1 to 6285:1
– High efficiency in the smallest of spaces
– High reduction ratio within an extremely small package
– Concentric gearhead insight and output
Versions:
– Plastic version
– Ceramic version
– High-power gearheads
– Heavy-duty gearheads
– Gearheads with reduced backlash
80mm size inline planetary reducer for NEMA34 (flange 86mm) or NEMA42 stepper motor. Precision significantly less than 18 Arcmin. High torque, compact size and competitive cost. The 16mm shaft diameter ensures balance in applications with belt tranny. Fast mounting for your equipment.
80mm size inline planetary reducer for NEMA34 (flange 86mm) or NEMA42 stepper motor. Precision less than 18 Arcmin. High torque, compact size and competitive price. The 16mm shaft diameter ensures stability in applications with belt transmitting. Fast mounting for your equipment.
1. Planetary ring equipment material: metal steel
2. Bearing at result type: Ball bearing
3. Max radial load (12mm range from flange): 550N
4. Max shaft axial load: 500N
5. Backlash: 18 arcmin
6. Gear ratio from 3 to 216
7. Planetary gearbox duration from 79 to 107mm
NEMA34 Precision type Planetary Gearbox for nema 34 Gear Stepper Motor 50N.m (6944oz-in) Rated Torque
This gear ratio is 5:1, if need other gear ratio, please contact us.
Input motor shaft demand :
suitable with regular nema34 stepper electric motor shaft 14mm diameter*32 length(Including pad height). (plane and Circular shaft and essential shaft both available)
The difference between the economical and precision Nema34 planetary reducer:
To begin with: the economic and precise installation strategies are different. The insight of the economical retarder assembly is the keyway (ie the output shaft of the engine can be an assembleable keyway motor); the input of the precision reducer assembly is usually clamped and the insight motor shaft is a flat or circular shaft or keyway. The shaft can be mounted (notice: the keyway shaft could be removed after the key is removed).
Second, the economical and precision planetary gearboxes possess the same drawings and dimensions. The main difference is: the materials is different. Accurate gear models are more advanced than economical gear units in terms of transmission efficiency and accuracy, along with heat and sound and torque output stability.
