An assembly of meshed gears consisting of a central or sun equipment, a coaxial Planetary Gear Transmission internal or ring equipment, and one or more intermediate pinions supported upon a revolving carrier. Sometimes the term planetary gear train is used broadly as a synonym for epicyclic equipment train, or narrowly to point that the ring gear is the fixed member. In a simple planetary gear teach the pinions mesh concurrently with the two coaxial gears (observe illustration). With the central equipment fixed, a pinion rotates about it as a planet rotates about its sunlight, and the gears are named appropriately: the central gear may be the sun, and the pinions will be the planets.
This is a compact, ‘single’ stage planetary gearset where in fact the output is derived from another ring gear varying a few teeth from the primary.
With the initial model of 18 sun teeth, 60 ring teeth, and 3 planets, this resulted in a ‘single’ stage gear reduction of -82.33:1.
A normal planetary gearset of this size could have a decrease 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
Output 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 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 program. This is how planetary gears obtained their name.
The components of a planetary gear train could 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 traveling sun pinion can be in the center of the ring gear, and is coaxially arranged with regards to the output. The sun pinion is usually attached to a clamping system in order to offer the mechanical link with 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 result 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 tranny ratio of the gearbox. The amount of planets can also vary. As the number of planetary gears boosts, 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 portion of the total output needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The benefit of a planetary gear 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 has a continuous size, different ratios can be realized by different the number of teeth of sunlight gear and the number of tooth of the planetary gears. The smaller the sun gear, the greater the ratio. Technically, a meaningful ratio range for a planetary stage is 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 acquired by connecting many planetary phases 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 ring 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 pick up 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 well established in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High tranny ratios may also easily be achieved with planetary gearboxes. Because of their 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 several 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 because of fixing this or that portion of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for a wide selection of applications
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 acquired their name.
The components 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 driving sun pinion is certainly 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 to be able to offer the mechanical link with the electric motor shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between the sunlight pinion and the band 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 number of teeth does not have any effect on the tranny ratio of the gearbox. The number of planets can also vary. As the amount of planetary gears increases, the distribution of the load increases and then the torque that can be transmitted. Increasing the amount of tooth engagements also decreases the rolling power. Since just area of the total output 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 is based on this load distribution. It is therefore feasible to transmit high torques wit
h high efficiency with a concise style using planetary gears.
Provided that the ring gear has a continuous size, different ratios can be realized by different the amount of teeth of the sun 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 can be approx. 3:1 to 10:1, since the planetary gears and sunlight gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting several planetary phases 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 any direction of rotation. It is also possible to repair the drive shaft in order to grab the torque via the ring equipment. Planetary gearboxes have become extremely important in many areas of mechanical engineering.
They have become 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 their positive properties and small 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
Almost unlimited transmission ratio options due to mixture of several planet stages
Suitable as planetary switching gear because of fixing this or that portion 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 equipment box are replaced with more compact and more reliable sun and planetary type of gears arrangement and also the manual clutch from manual power train is certainly replaced with hydro coupled clutch or torque convertor which in turn produced the transmission automatic.
The thought of epicyclic gear box is extracted from the solar system which is considered to the perfect 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 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 exterior 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 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 nearly all cases the housing is fixed. The driving sun pinion is usually in the heart of the ring gear, and is coaxially arranged in relation to the output. Sunlight pinion is usually mounted on a clamping system in order to offer the mechanical connection to the motor 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 result shaft of the gearbox.
The sole reason for the planetary gears is to transfer the required torque. The amount of teeth has no effect on the transmission ratio of the gearbox. The amount of planets can also vary. As the number of planetary gears boosts, the distribution of the load increases and then the torque that can be transmitted. Increasing the amount of tooth engagements also reduces the rolling power. Since just section of the total result needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The advantage of a planetary equipment compared to an individual spur gear lies in this load distribution. It is therefore feasible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
Provided that the ring gear has a constant size, different ratios could be realized by varying the amount of teeth of the sun gear and the number of teeth of the planetary gears. The smaller the sun equipment, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is certainly 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 a number of planetary stages in series in the same ring gear. In this instance, 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 virtually any direction of rotation. It is also 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 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 tranny ratios may also easily be achieved with planetary gearboxes. Because of their 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 because of mixture 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
In a planetary gearbox, many teeth are engaged at once, which allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back to the 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 do involve some disadvantages. Their complexity in design and manufacturing can make them a far more expensive alternative than various other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put closer to the sun gear compared to the others, imbalances in the planetary gears may appear, leading to premature wear and failing. Also, the small footprint of planetary gears makes high temperature dissipation more difficult, so applications that operate at very high speed or experience continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers offer right-angle designs that integrate other gear sets (frequently 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 is dependent on the drive configuration.
2 Max input speed linked to ratio and max output speed
3 Max radial load positioned 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 program (or Epicyclic system as it can be known), consists normally of a centrally pivoted sunlight gear, a ring equipment and several planet 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 advantage of a planetary transmission depends upon load distribution over multiple planet gears. It is thereby feasible 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 sun gear #1. The next gear step engages with sun gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sunlight gear 1 with the ring gear, three ratio variations 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), sunlight gear 1 is coupled with the ring equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate together at the same velocity. The stepped planet gears do not unroll. Therefore the gear ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sun gear 3 and ring gear 3 are directly coupled.
Many “gears” are utilized for automobiles, but they are also used for many additional machines. The most frequent one is the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of an automobile plays : one can be to decelerate the high rotation quickness emitted by the engine to transmit to tires; the other is to improve the reduction ratio in accordance with the acceleration / deceleration or generating speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of driving amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is not possible to rotate tires with the same rotation quickness to run, it is required to lessen the rotation speed using the ratio of the number of gear teeth. Such a role is called deceleration; the ratio of the rotation swiftness of engine and that of wheels is named the reduction ratio.
Then, 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 begin moving however they do not require this kind of a sizable force to keep moving once they have began to move. Automobile could be cited as an example. An engine, nevertheless, by its nature can’t so finely change its output. Consequently, one adjusts its result by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the amount of tooth of gears meshing with each other can be considered as the ratio of the length of levers’ arms. That is, if the decrease ratio is large and the rotation rate as output is lower in comparison to that as input, the energy output by transmitting (torque) will be large; if the rotation acceleration as output is not so low in comparison compared to that as input, on the other hand, the energy output by transmission (torque) will be little. Thus, to change the reduction ratio utilizing transmitting is much akin to the theory of moving things.
Then, how does a transmitting alter the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sun gear A, several world gears B, internal gear C and carrier D that connects world gears as seen in the graph below. It has a very complex structure rendering its style or production most difficult; it can understand the high reduction ratio through gears, however, it is a mechanism suited to a reduction system that requires both little size and powerful such as for example transmission for automobiles.
The planetary speed reducer & gearbox is some sort of transmission mechanism. It utilizes the rate transducer of the gearbox to lessen the turnover quantity of the motor to the required one and obtain a huge torque. How really does a planetary gearbox work? We are able to find out more about it from the structure.
The primary transmission structure of the planetary gearbox is planet gears, sun gear and ring gear. The ring gear is positioned in close get in touch with with the internal gearbox case. Sunlight equipment driven by the external power lies in the guts of the ring equipment. Between your sun gear and ring gear, there is a planetary equipment set consisting of three gears equally built-up at the earth carrier, which is usually floating among them counting on the support of the output shaft, ring equipment and sun gear. When sunlight equipment can be actuated by the input power, the earth gears will be driven to rotate and revolve around the center along with the orbit of the ring gear. The rotation of the earth gears drives the output shaft connected 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 rate reducers gearboxes in Ever-Power are created for square flange, which are easy and practical for installation and ideal for AC/DC servo motors, stepper motors, hydraulic motors etc.
Due to these advantages, planetary gearboxes can be applied to the lifting transportation, engineering machinery, metallurgy, mining, petrochemicals, structure machinery, light and textile sector, medical equipment, device and gauge, automobile, ships, weapons, aerospace and other commercial sectors.
The primary reason to employ a gearhead is that it makes it possible to regulate a sizable load inertia with a comparatively small motor inertia. Without the gearhead, acceleration or velocity control of the strain would require that the motor torque, and therefore current, would have to be as many times greater as the decrease ratio which is used. Moog offers a selection of windings in each body size that, combined with a selection of reduction ratios, provides an range of solution to result requirements. Each mixture of motor and gearhead offers unique advantages.
Precision Planetary Gearheads
gearheads
32 mm LOW PRICED 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 as high as 120 Nm. As a rule, the larger gearheads include ball bearings at the gearhead result.
Properties of the Ever-Power planetary gearhead:
– For transmission of high torques up to 180 Nm
– Reduction ratios from 4:1 to 6285:1
– High functionality in the tiniest of spaces
– High reduction ratio within an extremely small package
– Concentric gearhead input 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 price. The 16mm shaft diameter ensures balance in applications with belt tranny. Fast installation 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 output 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 e mail us.
Input motor shaft demand :
suitable with regular nema34 stepper motor shaft 14mm diameter*32 length(Including pad height). (plane and Round shaft and important 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 input of the cost-effective retarder assembly is the keyway (ie the output shaft of the motor is an assembleable keyway engine); the input of the precision reducer assembly can be clamped and the input engine shaft is a flat or circular shaft or keyway. The shaft could be mounted (notice: the keyway shaft can 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 material differs. Accurate gear models are more advanced than economical gear units in conditions of transmission efficiency and accuracy, in addition to heat and noise and torque output balance.