An assembly of meshed gears consisting of a central or sun gear, a coaxial inner or ring gear, and a number of intermediate pinions supported upon a revolving carrier. Occasionally the word planetary gear train is utilized broadly as a synonym for epicyclic gear teach, or narrowly to point that the ring equipment is the set member. In a straightforward planetary gear teach the pinions mesh at the same time with the two coaxial gears (discover 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 sunlight, and the pinions are the planets.
This is a compact, ‘single’ stage planetary gearset where in fact the output comes from another ring gear varying a few teeth from the principal.
With the initial style of 18 sun teeth, 60 band teeth, and 3 planets, this resulted in 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 little 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
Output Shaft Support Dual Ball Bearing
Electrical Connection Male Spade Terminal
Operating Temperature -10 ~ +60°C
Mounting 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 operate between a gear with internal teeth and a gear with external teeth on a concentric orbit. The circulation of the spur gear occurs in analogy to the orbiting of the planets in the solar system. This is how planetary gears acquired their name.
The components of a planetary gear train could be split into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In nearly all cases the housing is fixed. The generating sun pinion can be in the heart of the ring gear, and is coaxially organized with Planetary Gear Transmission regards to the output. Sunlight pinion is usually mounted on a clamping system in order to offer the mechanical connection to the engine shaft. During operation, 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 required torque. The amount of teeth has no effect on the transmitting ratio of the gearbox. The amount of planets can also vary. As the number of planetary gears raises, the distribution of the strain increases and then the torque which can be transmitted. Raising the amount of tooth engagements also reduces the rolling power. Since just portion of the total result has 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. Hence, it is feasible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
Provided that the ring gear has a continuous size, different ratios could be realized by different 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 usually 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 acquired by connecting many planetary stages in series in the same band gear. In cases like this, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a ring gear that is not fixed but is driven in virtually any direction of rotation. Additionally it is possible to repair the drive shaft in order to pick up the torque via the ring equipment. Planetary gearboxes have become extremely important in many areas of mechanical engineering.
They have become 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 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
Nearly unlimited transmission ratio options due to combination of several planet stages
Suitable as planetary switching gear because of fixing this or that part 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 operate 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 system. This is one way 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 housing is fixed. The traveling sun pinion is certainly in the center of the ring equipment, and is coaxially arranged in relation to the output. The sun pinion is usually attached to a clamping system in order to provide the mechanical connection to the engine shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between the sunlight pinion and the ring gear. The planetary carrier also represents the output shaft of the gearbox.
The sole reason for the planetary gears is to transfer the required torque. The amount of teeth does not have any effect on the tranny ratio of the gearbox. The number of planets may also vary. As the number of planetary gears raises, the distribution of the strain increases and then the torque that can be transmitted. Increasing 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 gear compared to an individual spur gear lies in this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a concise style using planetary gears.
So long as the ring gear includes a continuous size, different ratios could be realized by various the number of teeth of the sun gear and the number of the teeth of the planetary gears. Small the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is approx. 3:1 to 10:1, because the planetary gears and the sun gear are extremely little above and below these ratios. Higher ratios can be acquired by connecting several 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 fixed but is driven in any direction of rotation. It is also possible to fix the drive shaft to be able to pick up the torque via the band 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 should be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios may also easily be performed with planetary gearboxes. Because of the positive properties and small 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 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
Chance for 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 set up from manual equipment box are replaced with an increase of compact and more dependable sun and planetary kind of gears arrangement and also 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 known as to the perfect 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 based on the need 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 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 system. This is one way planetary gears obtained their name.
The elements of a planetary gear train could 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 traveling sun pinion is definitely in the heart of the ring equipment, and is coaxially organized in relation to the output. Sunlight pinion is usually attached to a clamping system to be able to provide the mechanical connection to the electric motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sunlight pinion and the ring gear. 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 tranny ratio of the gearbox. The number of planets may also vary. As the amount of planetary gears improves, 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 only part 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 possible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
So long as the ring gear has a constant size, different ratios can be realized by different the amount of teeth of sunlight gear and the amount 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 usually approx. 3:1 to 10:1, because the planetary gears and sunlight gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting many planetary levels in series in the same ring gear. In this case, we speak of 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 any direction of rotation. It is also possible to fix the drive shaft to be able to pick up the torque via the ring gear. Planetary gearboxes have become extremely important in many areas 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 tranny ratios may also easily be achieved with planetary gearboxes. Because of the 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 due to low rolling power
Almost unlimited transmission ratio options because of combination of several planet stages
Appropriate as planetary switching gear due to fixing this or that area of the gearbox
Chance for use as overriding gearbox
Favorable volume output
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back again to the electric motor. Having multiple teeth share the load also allows planetary gears to transmit high degrees of torque. The mixture of compact size, large speed reduction and high torque transmitting makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive remedy than other gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary equipment is positioned closer to the sun gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the small footprint of planetary gears makes warmth dissipation more difficult, therefore applications that operate at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment should be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical the teeth) to supply 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 would depend on the drive configuration.
2 Max input speed related to ratio and max result speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (not available 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 engine input SAE C or D hydraulic
A planetary transmission system (or Epicyclic system as it is also known), consists normally of a centrally pivoted sunlight gear, a ring equipment and several world gears which rotate between these.
This assembly concept explains the word planetary transmission, as the earth gears rotate around sunlight gear as in the astronomical sense the planets rotate around our sun.
The benefit of a planetary transmission is determined by load distribution over multiple planet gears. It is thereby possible to transfer high torques employing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power 500/14 have two selectable sunlight gears. The first gear stage of the stepped planet gears engages with sunlight gear #1. The next gear 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 band gear, three ratio variants are achievable with each gear assembly.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct gear selected in gear assy (1) or (2), the sun gear 1 is in conjunction with the ring gear in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and band gear then rotate collectively at the same acceleration. The stepped planet gears usually do not unroll. Thus the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sunlight gear 3 and band gear 3 are straight coupled.
Many “gears” are utilized for automobiles, however they are also used for many various other 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 velocity emitted by the engine to transmit to tires; the additional is to change the reduction ratio in accordance with the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the overall state of traveling amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation velocity to run, it is necessary to lower the rotation speed using the ratio of the amount of gear teeth. Such a role is called deceleration; the ratio of the rotation rate of engine and that of wheels is named the reduction ratio.
Then, why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances need a large force to start moving however they do not require this kind of a sizable force to excersice once they have began to move. Automobile can be cited as an example. An engine, nevertheless, by its character can’t so finely modify its output. As a result, one adjusts its result by changing the decrease ratio employing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with one another can be deemed as the ratio of the length of levers’ arms. That’s, if the decrease ratio is large and the rotation swiftness as output is lower in comparison to that as input, the energy output by transmission (torque) will be huge; if the rotation acceleration as output is not so low in comparison to that as insight, however, the energy output by transmitting (torque) will be little. Thus, to change the decrease ratio utilizing transmitting is much comparable to the principle of moving things.
Then, how does a tranny change the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sunlight gear A, several planet gears B, internal gear C and carrier D that connects world gears as observed in the graph below. It has 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 small size and high performance such as for example transmission for automobiles.
The planetary speed reducer & gearbox is some sort of transmission mechanism. It utilizes the speed transducer of the gearbox to lessen the turnover amount of the electric motor to the required one and obtain a big torque. How does a planetary gearbox work? We are able to find out more about it from the framework.
The main transmission structure of the planetary gearbox is planet gears, sun gear and ring gear. The ring gear is situated in close contact with the internal gearbox case. The sun gear driven by the external power lies in the center of the ring equipment. Between your sun gear and ring gear, there exists a planetary equipment set consisting of three gears similarly built-up at the planet carrier, which can be floating among them relying on the support of the result shaft, ring gear and sun gear. When the sun equipment is usually actuated by the insight power, the planet gears will be powered to rotate and revolve around the guts together with the orbit of the ring gear. The rotation of the earth gears drives the result shaft linked with the carrier to output the power.
Planetary speed reducer applications
Planetary speed reducers & gearboxes have a lot of advantages, like little size, light-weight, high load capability, long service life, high reliability, low noise, large output torque, wide selection of speed ratio, high efficiency and so on. Besides, the planetary swiftness reducers gearboxes in Ever-Power are created for square flange, which are easy and hassle-free for installation and suitable for AC/DC servo motors, stepper motors, hydraulic motors etc.
Because of these advantages, planetary gearboxes are applicable to the lifting transport, engineering machinery, metallurgy, mining, petrochemicals, building machinery, light and textile sector, medical equipment, instrument and gauge, automobile, ships, weapons, aerospace and other commercial sectors.
The primary reason to use a gearhead is that it makes it possible to control a huge 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 have to be as many times higher as the reduction ratio which is used. Moog offers an array of windings in each body size that, combined with a selection of reduction ratios, offers an assortment of solution to result requirements. Each mixture of motor and gearhead offers exclusive 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 ideal for transmitting high torques of up to 120 Nm. As a rule, the larger gearheads include ball bearings at the gearhead output.
Properties of the Ever-Power planetary gearhead:
– For tranny of high torques up to 180 Nm
– Reduction ratios from 4:1 to 6285:1
– High performance in the tiniest 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 minimal backlash
80mm size inline planetary reducer for NEMA34 (flange 86mm) or NEMA42 stepper motor. Precision significantly less than 18 Arcmin. High torque, small size and competitive cost. The 16mm shaft diameter ensures stability in applications with belt tranny. Fast mounting for your equipment.
80mm size inline planetary reducer for NEMA34 (flange 86mm) or NEMA42 stepper motor. Precision significantly less than 18 Arcmin. High torque, small size and competitive price. The 16mm shaft diameter ensures balance in applications with belt transmission. Fast installation for your equipment.
1. Planetary ring gear 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 length from 79 to 107mm
NEMA34 Precision type Planetary Gearbox for nema 34 Gear Stepper Engine 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 engine shaft 14mm diameter*32 size(Including pad elevation). (plane and Round shaft and important shaft both available)
The difference between the economical and precision Nema34 planetary reducer:
First of all: the financial and precise installation methods are different. The insight of the cost-effective retarder assembly may be the keyway (ie the result shaft of the motor can be an assembleable keyway motor); the insight of the precision reducer assembly can be clamped and the insight electric motor shaft is a set or circular shaft or keyway. The shaft could be mounted (take note: the keyway shaft can be removed following the key is removed).
Second, the economical and precision planetary gearboxes possess the same drawings and sizes. The main difference is: the materials is different. Accurate gear devices are more advanced than economical gear units when it comes to transmission efficiency and precision, and also heat and noise and torque output balance.