Planetary Gear Transmission

An assembly of meshed gears comprising a central or sun gear, a coaxial internal or ring equipment, and one or more intermediate pinions supported on a revolving carrier. Occasionally the term planetary gear train can be used broadly as a synonym for epicyclic equipment train, or narrowly to point that the ring gear is the fixed member. In a straightforward planetary gear teach the pinions mesh at the same time with both coaxial gears (find illustration). With the central equipment set, a pinion rotates about it as a world rotates about its sun, and the gears are called accordingly: the central gear may be the sun, and the pinions will be the planets.
This is a concise, ‘single’ stage planetary gearset where in fact the output comes from another ring gear varying a few teeth from the primary.
With the initial model 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 decrease 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
Result 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)
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 equipment 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 could be divided 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 is definitely 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 offer the mechanical connection to the electric motor shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between your sun pinion and the ring equipment. The planetary carrier also represents the output shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the mandatory 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 boosts, the distribution of the load increases and then the torque which can be transmitted. Increasing 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 advantage 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 efficiency with a concise Planetary Gear Transmission design using planetary gears.
Provided that the ring gear includes a constant size, different ratios could be realized by various the amount of teeth of sunlight gear and the amount of tooth of the planetary gears. Small the sun equipment, 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 little above and below these ratios. Higher ratios can be acquired by connecting many planetary stages 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 band gear that is not set but is driven in virtually any direction of rotation. It is also possible to fix the drive shaft to be able to grab the torque via the band gear. Planetary gearboxes have grown to be extremely important in many regions of mechanical engineering.
They have grown to be particularly more developed 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 the positive properties and small design, the gearboxes possess many potential uses in industrial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to many planetary gears
High efficiency because of low rolling power
Almost unlimited transmission ratio options because of combination of several planet stages
Ideal as planetary switching gear 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
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 gear occurs in analogy to the orbiting of the planets in the solar program. This is how planetary gears obtained their name.
The parts of a planetary gear train can be divided into four main constituents.
The housing with integrated internal teeth is known as a ring gear. In the majority of cases the housing is fixed. The driving sun pinion is certainly in the heart of the ring equipment, and is coaxially organized with regards to the output. Sunlight 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 installed on a planetary carrier, roll between the sun 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 has no effect on the transmission ratio of the gearbox. The number of planets may also vary. As the number of planetary gears boosts, the distribution of the strain increases and therefore the torque which can be transmitted. Increasing the amount of tooth engagements also reduces the rolling power. Since just part of the total output has to be transmitted as rolling power, a planetary gear is extremely efficient. The benefit of a planetary gear compared to an individual spur gear is based on this load distribution. Hence, it is feasible to transmit high torques wit
h high efficiency with a compact design using planetary gears.
So long as the ring gear includes a continuous size, different ratios can be realized by varying the amount of teeth of sunlight gear and the number of the teeth of the planetary gears. Small the sun equipment, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is usually approx. 3:1 to 10:1, because the planetary gears and sunlight gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting several planetary stages in series in the same ring gear. In cases like this, 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 any direction of rotation. Additionally it is possible to fix the drive shaft in order to grab the torque via the ring gear. Planetary gearboxes have grown to be 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 can also easily be achieved 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 because of 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 portion of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for an array of applications
Epicyclic gearbox can be an automatic type gearbox where parallel shafts and gears set up from manual equipment box are replaced with more compact and more reliable 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 thought of epicyclic gear box is extracted from the solar system which is known as to an ideal arrangement of objects.
The epicyclic gearbox usually comes with the P N R D S (Parking, Neutral, Reverse, Drive, Sport) modes which is obtained by fixing of sun and planetary gears based on the require 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 gear takes place 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 casing is fixed. The traveling sun pinion is in the center of the ring equipment, and is coaxially arranged with regards to the output. Sunlight pinion is usually attached to a clamping system to be able to offer the mechanical link with the engine shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between your sun pinion and the ring equipment. 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 amount of planets can also vary. As the amount of planetary gears improves, the distribution of the load increases and then the torque that can be transmitted. Increasing the number of tooth engagements also reduces the rolling power. Since just area of the total output 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 is based on this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a concise design using planetary gears.
So long as the ring gear includes a continuous size, different ratios could be realized by various the amount of teeth of sunlight gear and the amount of teeth of the planetary gears. Small the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is 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 cases like this, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a band 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 grab the torque via the ring equipment. Planetary gearboxes have grown to be 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 transmitting ratios may also easily be performed with planetary gearboxes. Because of their positive properties and compact design, the gearboxes possess 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 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, which allows high speed decrease to be performed with relatively small gears and lower inertia reflected back again to the engine. Having multiple teeth discuss the load also allows planetary gears to transmit high levels of torque. The combination of compact size, large speed reduction and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in style and manufacturing can make them a more expensive solution than other gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary equipment is put closer to the sun gear than the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the compact footprint of planetary gears makes warmth dissipation more difficult, therefore applications that run at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers offer right-angle designs that integrate other gear sets (often 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 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 electric motor input SAE C or D hydraulic
A planetary transmission program (or Epicyclic system since it can be known), consists normally of a centrally pivoted sun gear, a ring gear and several world gears which rotate between these.
This assembly concept explains the word 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 really is thereby possible to transfer high torques employing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power 500/14 possess two selectable sunlight gears. The first gear stage of the stepped world gears engages with sun 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 sun gear 1 with the ring gear, three ratio variants are achievable with each equipment assembly.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct gear selected in equipment assy (1) or (2), the sun gear 1 is coupled with the ring equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate jointly at the same rate. The stepped planet gears usually 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 straight coupled.
Many “gears” are utilized for automobiles, however they are also utilized for many various other machines. The most frequent one may be the “transmission” that conveys the energy of engine to tires. There are broadly two roles the transmission of a car plays : one is definitely to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the additional is to improve the reduction ratio relative to the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the overall state of driving amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is unattainable to rotate tires with the same rotation speed to run, it is necessary to lessen the rotation speed using the ratio of the amount of gear teeth. This kind of a role is called deceleration; the ratio of the rotation velocity of engine and that of tires is named the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances need a large force to start moving however they usually do not require this kind of a big force to keep moving once they have began to move. Automobile could be cited as an example. An engine, however, by its character can’t so finely modify its output. Therefore, one adjusts its output by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of tooth of gears meshing with one another can be considered as the ratio of the space of levers’ arms. That’s, if the reduction ratio is large and the rotation quickness as output is low in comparison to that as insight, the power output by transmitting (torque) will be large; if the rotation acceleration as output isn’t so lower in comparison compared to that as input, however, the energy output by transmission (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 change 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, sun gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It includes a very complex framework rendering its style or production most challenging; it can understand the high decrease ratio through gears, nevertheless, it is a mechanism suitable for a reduction mechanism 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 velocity transducer of the gearbox to lessen the turnover quantity of the motor to the required one and get a big torque. How really does a planetary gearbox work? We are able to learn more about it from the structure.
The primary transmission structure of the planetary gearbox is planet gears, sun gear and band gear. The ring equipment is situated in close get in touch with with the internal gearbox case. Sunlight equipment driven by the exterior power lies in the guts of the ring equipment. Between your sun gear and ring gear, there exists a planetary equipment set comprising three gears equally built-up at the planet carrier, which is definitely floating among them counting on the support of the output shaft, ring equipment and sun gear. When sunlight equipment is actuated by the input power, the planet gears will be powered to rotate and revolve around the guts along with the orbit of the band equipment. The rotation of the planet 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 small 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 forth. Besides, the planetary quickness reducers gearboxes in Ever-Power are created for sq . flange, which are easy and practical 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, device and gauge, car, ships, weapons, aerospace and other industrial 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 engine torque, and thus current, would have to be as many times better as the reduction ratio which can be used. Moog offers an array of windings in each frame size that, coupled with a selection of reduction ratios, provides an assortment of solution to result 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 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 tranny 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 in 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, compact size and competitive price. 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 significantly less than 18 Arcmin. High torque, small size and competitive cost. The 16mm shaft diameter ensures balance in applications with belt tranny. Fast installation 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 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 standard nema34 stepper motor shaft 14mm diameter*32 size(Including pad elevation). (plane and Circular shaft and important shaft both available)
The difference between your economical and precision Nema34 planetary reducer:
First of all: the economic and precise installation strategies are different. The input of the economical retarder assembly may be the keyway (ie the output shaft of the engine can be an assembleable keyway engine); the input of the precision reducer assembly is definitely clamped and the input motor shaft is a set or circular shaft or keyway. The shaft could be mounted (take note: the keyway shaft could be removed following the key is removed).
Second, the economical and precision planetary gearboxes possess the same drawings and measurements. The main difference is: the materials is different. Accurate gear devices are superior to economical gear units in conditions of transmission efficiency and accuracy, in addition to heat and sound and torque output balance.