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June 29, 2020

An assembly of meshed gears consisting of a central or sun gear, a coaxial inner 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 equipment teach, or narrowly to indicate that the ring equipment is the set member. In a straightforward planetary gear train the pinions mesh simultaneously with the two coaxial gears (see illustration). With the central equipment set, a pinion rotates about any of 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 compact, ‘single’ stage planetary gearset where the output is derived from another ring gear varying a few teeth from the principal.
With the initial model of 18 sun teeth, 60 band teeth, and 3 planets, this led to a ‘single’ stage gear reduction of -82.33:1.
A normal planetary gearset of this size could 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
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)
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 equipment occurs in analogy to the orbiting of the planets in the solar program. This is one way planetary gears acquired 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 can be in the center of the ring equipment, 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 engine shaft. During operation, 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 number of teeth does not have any effect on the transmission 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 therefore the torque that can be transmitted. Raising the amount of tooth engagements also reduces the rolling power. Since only part of the total output needs 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. It is therefore feasible to transmit high torques wit
h high efficiency with a compact design 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 amount of teeth of the planetary gears. Small the sun equipment, the higher 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 small above and below these ratios. Higher ratios can be acquired by connecting several planetary levels 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 band gear that’s not set but is driven in virtually any direction of rotation. Additionally it is possible to fix the drive shaft in order to pick up the torque via the ring equipment. Planetary gearboxes have become extremely important in lots of 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 can also easily be performed with planetary gearboxes. Because of the positive properties and small design, the gearboxes possess many potential uses in commercial 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
Nearly unlimited transmission ratio options because of mixture of several planet Planetary Gear Transmission stages
Suitable as planetary switching gear because of fixing this or that part 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 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 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 the majority of cases the housing is fixed. The driving sun pinion is definitely 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 provide 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 band 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 transmitting ratio of the gearbox. The number of planets may also vary. As the amount 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 decreases the rolling power. Since only portion of the total result has to be transmitted as rolling power, a planetary equipment is incredibly efficient. The advantage 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 style using planetary gears.
Provided that the ring gear has a continuous size, different ratios can be realized by various the amount of teeth of the sun gear and the amount of teeth of the planetary gears. Small 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 obtained by connecting a number of planetary levels in series in the same ring gear. In this instance, 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 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 become extremely important in many areas of mechanical engineering.
They have become particularly more developed 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 performed with planetary gearboxes. Because of the 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 because of low rolling power
Nearly unlimited transmission ratio options because of combination of several planet stages
Suitable as planetary switching gear because of fixing this or that part 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 in which parallel shafts and gears arrangement from manual equipment box are replaced with an increase of compact and more reliable sun and planetary kind of gears arrangement as well as the manual clutch from manual power train can be replaced with hydro coupled clutch or torque convertor which in turn produced the transmission automatic.
The idea 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) modes which is obtained by fixing of sun and planetary gears based on the need of the drive.
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.
Provided that the ring gear includes a continuous size, different ratios can be realized by various the number of teeth of sunlight gear and the amount 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 usually 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 because of 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
In a planetary gearbox, many teeth are engaged at once, that allows high speed reduction to be performed with fairly small gears and lower inertia reflected back again to the electric motor. Having multiple teeth talk about the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, large speed reduction and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive remedy than other gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary gear is put closer to the sun gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the small footprint of planetary gears makes heat dissipation more difficult, therefore applications that operate at high speed or experience continuous procedure may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers offer right-angle designs that integrate other gear sets (frequently bevel gears with helical teeth) to supply an offset between your 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 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 electric 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 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 benefit 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 equipment 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 second equipment step engages with sunlight gear #2. With sun gear one or two 2 coupled to the axle,or the coupling of sun 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 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 do not unroll. Hence the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sunlight gear 3 and band gear 3 are straight coupled.
Many “gears” are used for automobiles, but they are also used for many other machines. The most frequent one may be the “transmitting” 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 other is to improve the reduction ratio in accordance with the acceleration / deceleration or driving speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of generating amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is difficult to rotate tires with the same rotation swiftness to run, it is required to lower the rotation speed using the ratio of the number of gear teeth. Such a role is called deceleration; the ratio of the rotation acceleration of engine and that of tires is named the reduction ratio.
Then, why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to start moving however they do not require this kind of a huge force to excersice once they have started to move. Automobile can be cited as an example. An engine, nevertheless, by its nature can’t so finely modify its output. For that reason, one adjusts its output by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the number of tooth of gears meshing with each other can be deemed as the ratio of the length of levers’ arms. That is, if the decrease ratio is large and the rotation velocity as output is lower in comparison to that as input, the power output by transmitting (torque) will be large; if the rotation quickness as output isn’t so lower in comparison to that as insight, on the other hand, the power output by tranny (torque) will be little. Thus, to change the reduction ratio utilizing transmission is much akin to the basic principle of moving things.
After that, how does a transmission alter the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear mechanism is a gear system consisting of 4 components, namely, sun gear A, several planet gears B, internal equipment C and carrier D that connects world gears as seen in the graph below. It includes a very complex framework rendering its design or production most challenging; it can realize the high decrease ratio through gears, nevertheless, it really is a mechanism suitable for a reduction mechanism that requires both little size and high performance such as for example transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the swiftness transducer of the gearbox to lessen the turnover number 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 structure.
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 inner gearbox case. Sunlight equipment driven by the exterior power lies in the center of the ring equipment. Between the sun gear and band gear, there exists a planetary equipment set comprising three gears similarly built-up at the earth carrier, which is certainly floating among them relying on the support of the result shaft, ring equipment and sun equipment. When the sun equipment is usually actuated by the input power, the earth gears will be driven to rotate and revolve around the center combined with the orbit of the ring equipment. The rotation of the earth gears drives the result shaft linked with the carrier to result 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 variety of speed ratio, high efficiency and so forth. Besides, the planetary quickness reducers gearboxes in Ever-Power are designed for square flange, which are easy and hassle-free for installation and ideal for AC/DC servo motors, stepper motors, hydraulic motors etc.
Due to these advantages, planetary gearboxes are applicable to the lifting transport, engineering machinery, metallurgy, mining, petrochemicals, structure machinery, light and textile industry, medical equipment, device and gauge, car, ships, weapons, aerospace and other industrial sectors.
The primary reason to employ a gearhead is that it makes it possible to control a sizable 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 many times higher as the decrease ratio which can be used. Moog offers a selection of windings in each frame size that, coupled with a selection of reduction ratios, provides an range of solution to output requirements. Each mixture of electric 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 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 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 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 cost. The 16mm shaft diameter ensures balance in applications with belt transmission. 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, small size and competitive price. The 16mm shaft diameter ensures stability in applications with belt tranny. Fast mounting for your equipment.
1. Planetary ring equipment material: metal steel
2. Bearing at output type: Ball bearing
3. Max radial load (12mm distance from flange): 550N
4. Max shaft axial load: 500N
5. Backlash: 18 arcmin
6. Gear ratio from 3 to 216
7. Planetary gearbox size from 79 to 107mm
NEMA34 Precision type Planetary Gearbox for nema 34 Gear Stepper Electric motor 50N.m (6944oz-in) Rated Torque
This gear ratio is 5:1, if need other gear ratio, please contact us.
Input motor shaft ask for :
suitable with standard nema34 stepper engine shaft 14mm diameter*32 duration(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 strategies are different. The insight of the economical retarder assembly is the keyway (ie the output shaft of the motor is an assembleable keyway electric motor); the insight of the precision reducer assembly is clamped and the insight electric motor shaft is a set or circular shaft or keyway. The shaft can be mounted (note: the keyway shaft can be removed after the key is removed).
Second, the economical and precision planetary gearboxes possess the same drawings and measurements. The primary difference is: the materials is different. Accurate gear models are more advanced than economical gear units with regards to transmission efficiency and accuracy, along with heat and noise and torque output stability.