Planetary Gear Transmission

An assembly of meshed gears consisting of a central or sun equipment, a coaxial internal or ring equipment, and one or more intermediate pinions supported on a revolving carrier. Occasionally the word planetary gear train can be used broadly as a synonym for epicyclic equipment train, or narrowly to point that the ring equipment is the set member. In a straightforward planetary gear train the pinions mesh simultaneously with both coaxial gears (see illustration). With the central gear set, a pinion rotates about it as a world rotates about its sun, and the gears are called appropriately: the central gear may be the sunlight, and the pinions are the planets.
This is a concise, ‘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 reduced amount of -82.33:1.
A normal planetary gearset of this size would have a reduction ratio of 4.33:1.
That is a good deal of torque in a small package.
At Nominal Voltage
Voltage (Nominal) 12V
Voltage Range (Recommended) 3V – 12V
Speed (No Load)* 52 rpm
Current (No Load)* 0.21A
Current (Stall)* 4.9A
Torque (Stall)* 291.6 oz-in (21 kgf-cm)
Gear Ratio 231:1
Gear Material Metal
Gearbox Style Planetary
Motor Type DC
Output Shaft Diameter 4mm (0.1575”)
Output Shaft Style D-shaft
Result Shaft Support Dual Ball Bearing
Electrical Connection Male Spade Terminal
Operating Temperature -10 ~ +60°C
Installation Screw Size M2 x 0.4mm
Product Weight 100g (3.53oz)
Within an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a gear with 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 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 casing is fixed. The traveling sun pinion can be 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 in order to offer the mechanical link with the motor shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between the sun pinion and the band equipment. The planetary carrier also represents the result shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the mandatory torque. The number 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 boosts, the distribution of the load increases and then the torque which can be transmitted. Raising the number of tooth engagements also reduces the rolling power. Since only portion of the total output has to be transmitted as rolling power, a planetary gear is incredibly efficient. The benefit 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 concise design using planetary gears.
So long as the ring gear includes a constant size, different ratios could be realized by different the number of teeth of sunlight gear and the number of teeth of the planetary gears. The smaller the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage can be approx. 3:1 to 10:1, 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 stages in series in the same ring gear. In this case, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a band gear that is not set but is driven in any direction of rotation. It is also possible to repair the drive shaft in order to pick up the torque via the band equipment. Planetary gearboxes have become extremely important in lots of regions 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 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 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 because of fixing this or that section of the gearbox
Chance for 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 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 traveling sun pinion is definitely in the center of the ring equipment, and is coaxially organized in relation to the output. The sun pinion is usually mounted on 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 your sun pinion and the band 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 has no 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 strain increases and then the torque which can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since only portion of the total output needs to be transmitted as rolling power, a planetary gear is extremely efficient. The advantage of a planetary equipment compared to a single spur gear is based on this load distribution. Hence, it is feasible to transmit high torques wit
h high efficiency with a concise style using planetary gears.
So long as the ring gear has a continuous size, different ratios could be realized by various the amount of teeth of the sun 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 approx. 3:1 to 10:1, since the planetary gears and sunlight gear are extremely little above and below these ratios. Higher ratios can be obtained by connecting a number of planetary phases in series in the same band gear. In this case, 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 Planetary Gear Transmission virtually any direction of rotation. It is also possible to repair the drive shaft in order to grab the torque via the ring gear. Planetary gearboxes have grown to be extremely important in lots of 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 transmitting ratios may also easily be performed with planetary gearboxes. Because of the positive properties and compact design, the gearboxes have many potential uses in commercial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to several 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 area of the gearbox
Chance for 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 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 teach can be replaced with hydro coupled clutch or torque convertor which in turn made the transmission automatic.
The idea of epicyclic gear box is extracted from the solar system which is considered to an ideal arrangement of objects.
The epicyclic gearbox usually comes with the P N R D S (Parking, Neutral, Invert, Drive, Sport) settings which is obtained by fixing of sun and planetary gears according to the 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 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 can 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 generating sun pinion can be in the center of the ring equipment, and is coaxially arranged in relation to the output. Sunlight pinion is usually mounted on a clamping system in order to offer the mechanical link with the motor shaft. During operation, the planetary gears, which are installed on a planetary carrier, roll between your sunlight pinion and the ring equipment. The planetary carrier also represents the output 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 amount of planets can also vary. As the amount of planetary gears improves, the distribution of the strain increases and therefore the torque that can be transmitted. Increasing the amount of tooth engagements also reduces the rolling power. Since only section of the total result needs to be transmitted as rolling power, a planetary equipment is extremely efficient. The advantage of a planetary equipment 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 design using planetary gears.
So long as the ring gear includes a constant size, different ratios could be realized by varying the number of teeth of the sun gear and the number of the teeth 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, because the planetary gears and the sun gear are extremely small above and below these ratios. Higher ratios can be obtained by connecting several 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 could be overlaid by having a ring gear that is not set but is driven in any direction of rotation. It is also possible to repair the drive shaft to be able to pick up the torque via the band equipment. Planetary gearboxes have become extremely important in lots of regions 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 may also easily be achieved 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 due to low rolling power
Nearly 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 motor. Having multiple teeth reveal the load also enables planetary gears to transmit high degrees of torque. The mixture of compact size, large speed reduction and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive solution than other gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary gear is positioned closer to sunlight gear than the others, imbalances in the planetary gears may appear, resulting in premature wear and failure. Also, the compact footprint of planetary gears makes temperature dissipation more difficult, so applications that run at high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment should be inline with one another, although manufacturers provide right-angle designs that include other gear sets (frequently bevel gears with helical tooth) 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 output speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable with all ratios)
Approximate dry weight100 -181 kg (220 – 400 lb)4
Radial load (max)14,287kg (31,500 lb)3
Drive typeSpeed reducer
Hydraulic engine input SAE C or D hydraulic
A planetary transmission program (or Epicyclic system since it can be 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 term 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 depends upon 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 possess two selectable sunlight gears. The first gear step of the stepped world gears engages with sunlight gear #1. The second equipment step engages with sun gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sun equipment 1 with the band gear, three ratio variations are achievable with each gear assembly.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment selected in gear assy (1) or (2), sunlight gear 1 is coupled with the ring equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate jointly at the same acceleration. 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. Sunlight gear 3 and band gear 3 are straight coupled.
Many “gears” are used for automobiles, but they are also utilized for many other machines. The most typical 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 certainly to decelerate the high rotation acceleration emitted by the engine to transmit to tires; the additional is to change the reduction ratio relative to 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 extremely hard to rotate tires with the same rotation acceleration to run, it is necessary to lower the rotation speed using the ratio of the number of gear teeth. This kind of a role is called deceleration; the ratio of the rotation quickness of engine and that of wheels is called 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 require a large force to begin moving however they usually do not require this kind of a big force to excersice once they have started to move. Automobile could be cited as a good example. An engine, nevertheless, by its character can’t so finely alter its output. As a result, 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 amount of the teeth of gears meshing with each other can be considered as the ratio of the distance of levers’ arms. That is, if the reduction ratio is huge and the rotation quickness as output is lower in comparison to that as insight, the power output by tranny (torque) will be huge; if the rotation rate as output isn’t so lower in comparison compared to that as input, however, the energy output by transmitting (torque) will be small. Thus, to change the reduction ratio utilizing transmitting is much akin to the theory of moving things.
Then, how does a tranny alter the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear system is a gear system comprising 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It includes a very complex structure rendering its style or production most difficult; it can realize the high reduction ratio through gears, however, it really is a mechanism suitable for a reduction system that requires both small size and powerful such as for example transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the speed transducer of the gearbox to reduce the turnover number of the engine to the mandatory one and get a big torque. How really does a planetary gearbox work? We can learn more about it from the framework.
The main transmission structure of the planetary gearbox is planet gears, sun gear and ring gear. The ring equipment is positioned in close contact with the inner gearbox case. Sunlight gear driven by the exterior power lies in the guts of the ring gear. 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 is floating among them relying on the support of the output shaft, ring equipment and sun gear. When sunlight equipment is definitely actuated by the insight 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 connected with the carrier to result the power.
Planetary speed reducer applications
Planetary speed reducers & gearboxes have a whole 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 on. Besides, the planetary acceleration reducers gearboxes in Ever-Power are made for square flange, which are easy and convenient for installation and ideal 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 market, medical equipment, instrument and gauge, vehicle, ships, weapons, aerospace and other industrial sectors.
The primary reason to employ a gearhead is that it creates it possible to control a big 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 thus current, would need to be as much times greater as the decrease ratio which can be used. Moog offers an array of windings in each framework size that, coupled with an array of reduction ratios, offers an range of solution to output 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 suitable for transmitting high torques of up to 120 Nm. Generally, the larger gearheads come with 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 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 reduced 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 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 transmission. Fast mounting for your equipment.
1. Planetary ring equipment material: metal steel
2. Bearing at result 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 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 request :
suitable with standard nema34 stepper engine shaft 14mm diameter*32 duration(Including pad height). (plane and Round shaft and crucial 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 economical retarder assembly may be the keyway (ie the result shaft of the engine can be an assembleable keyway engine); the input of the precision reducer assembly can be clamped and the insight engine shaft is a set or circular shaft or keyway. The shaft can be mounted (note: the keyway shaft could be removed after the key is removed).
Second, the economical and precision planetary gearboxes have the same drawings and measurements. The main difference is: the materials is different. Accurate gear devices are more advanced than economical gear units in conditions of transmission efficiency and precision, and also heat and sound and torque output balance.