An assembly of meshed gears consisting of a central or sun equipment, a coaxial inner 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 teach, or narrowly to point that the ring gear is the set member. In a straightforward planetary gear teach the pinions mesh concurrently with the two coaxial gears (see illustration). With the central gear set, a pinion rotates about it as a planet rotates about its sun, and the gears are called appropriately: the central gear is the sunlight, and the pinions are the planets.
This is a compact, ‘single’ stage planetary gearset where in fact the output is derived from a second ring gear varying a few teeth from the principal.
With the initial model of 18 sun teeth, 60 ring teeth, and 3 planets, this led to a ‘single’ stage gear reduced amount of -82.33:1.
A regular planetary gearset of the size would have a reduction ratio of 4.33:1.
That is a good deal of torque in a little package.
At Nominal Voltage
Voltage (Nominal) 12V
Voltage Range (Recommended) 3V – 12V
Speed (No Load)* 52 rpm
Current (No Load)* 0.21A
Current (Stall)* 4.9A
Torque (Stall)* 291.6 oz-in (21 kgf-cm)
Gear Ratio 231:1
Gear Material Metal
Gearbox Style Planetary
Motor Type DC
Output Shaft Diameter 4mm (0.1575”)
Output Shaft Style D-shaft
Output Shaft Support Dual Ball Bearing
Electrical Connection Man 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 equipment takes place 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 could be split into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In nearly all cases the casing is fixed. The driving sun pinion is usually in the heart of the ring equipment, and is coaxially organized in relation to the output. The sun pinion is usually attached to a clamping system to be able to offer the mechanical link with the electric motor shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between the sunlight pinion and the band equipment. 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 number of teeth does not have any effect on the transmitting ratio of the gearbox. The number of planets can also vary. As the amount of planetary gears boosts, the distribution of the strain increases and therefore the torque which can be transmitted. Raising the number of tooth engagements also reduces the rolling power. Since just Planetary Gear Transmission section of the total result needs to be transmitted as rolling power, a planetary equipment is incredibly efficient. The benefit 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 design using planetary gears.
So long as the ring gear has a continuous size, different ratios can be realized by different 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 is certainly approx. 3:1 to 10:1, since the planetary gears and the sun gear are extremely small above and below these ratios. Higher ratios can be obtained by connecting many planetary levels in series in the same ring gear. In this case, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a ring gear that is not fixed but is driven in virtually 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 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 transmission ratios may 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 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 due to fixing this or that portion of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for a wide range 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 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 the majority of cases the casing is fixed. The generating sun pinion is certainly in the center of the ring gear, and is coaxially organized with regards to the output. The sun 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 mounted on a planetary carrier, roll between your 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 required torque. The amount of teeth does not have any effect on the tranny ratio of the gearbox. The number of planets can also vary. As the number of planetary gears increases, 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 just part 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. 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 constant size, different ratios can be realized by varying the amount of teeth of the sun gear and the amount of the teeth of the planetary gears. The smaller the sun equipment, the greater 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 obtained by connecting several planetary phases 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’s not set but is driven in any direction of rotation. It is also possible to repair the drive shaft to be able 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 should be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios can 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 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 due to 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 range of applications
Epicyclic gearbox is an automatic type gearbox where parallel shafts and gears arrangement from manual gear box are replaced with an increase of compact and more reliable sun and planetary type of gears arrangement as well as the manual clutch from manual power teach is usually replaced with hydro coupled clutch or torque convertor which made the transmission automatic.
The idea of epicyclic gear box is extracted from the solar system which is known as to the perfect arrangement of objects.
The epicyclic gearbox usually includes 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.
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 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 elements 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 the majority of cases the casing is fixed. The generating sun pinion is certainly in the center of the ring gear, and is coaxially arranged with regards to the output. Sunlight pinion is usually mounted on a clamping system to be able to provide the mechanical connection to the motor shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between your sunlight 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 mandatory torque. The number of teeth has no effect on the transmitting ratio of the gearbox. The amount of planets may also vary. As the number of planetary gears improves, the distribution of the strain increases and therefore the torque that can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since just area of the total result needs 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. It is therefore feasible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
Provided that the ring gear includes a continuous size, different ratios could be realized by different the number of teeth of sunlight 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 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 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 can be overlaid by having a band gear that is not fixed but is driven in virtually any direction of rotation. It is also possible to repair the drive shaft to be able to grab the torque via the band equipment. Planetary gearboxes have grown to be 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 transmitting ratios may also easily be performed with planetary gearboxes. Because of the positive properties and compact 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 several planetary gears
High efficiency because of low rolling power
Almost unlimited transmission ratio options due to mixture of several planet stages
Suitable as planetary switching gear due to fixing this or that portion 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 achieved with fairly small gears and lower inertia reflected back again to the engine. Having multiple teeth talk about the load also enables planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque transmitting makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in style and manufacturing tends to make them a far more expensive remedy than various other gearbox types. And precision production is extremely important for these gearboxes. If one planetary gear is positioned closer to sunlight 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 warmth dissipation more difficult, therefore applications that operate at very high speed or experience continuous operation may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers offer right-angle designs that include other gear sets (frequently bevel gears with helical the teeth) 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 result speed
3 Max radial load positioned 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 system (or Epicyclic system as it can be known), consists normally of a centrally pivoted sun gear, a ring gear and several planet gears which rotate between these.
This assembly concept explains the word planetary transmission, as the planet 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 employing a compact design.
Gear assembly 1 and gear assembly 2 of the Ever-Power 500/14 possess two selectable sun gears. The first equipment step of the stepped world gears engages with sun gear #1. The second gear step engages with sun 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 equipment 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 in conjunction with the ring equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate collectively at the same swiftness. The stepped planet gears usually do not unroll. Hence the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sun gear 3 and band gear 3 are straight coupled.
Many “gears” are utilized for automobiles, however they are also used for many other machines. The most typical one may be the “transmission” that conveys the power of engine to tires. There are broadly two roles the transmission of a car plays : one is definitely to decelerate the high rotation rate emitted by the engine to transmit to tires; the various other is to change 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 general state of generating amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is extremely hard to rotate tires with the same rotation rate to perform, it is necessary to lower the rotation speed using the ratio of the amount of gear teeth. Such a role is named deceleration; the ratio of the rotation quickness of engine and that of wheels is named the reduction ratio.
Then, why is it necessary to alter the reduction ratio in accordance with the acceleration / deceleration or driving speed ? It is because substances need a large force to begin moving however they do not require this kind of a huge force to excersice once they have began to move. Automobile could be cited as a good example. An engine, however, by its character can’t so finely alter its output. For that reason, one adjusts its output by changing the reduction 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 deemed as the ratio of the length of levers’ arms. That is, if the decrease ratio is huge and the rotation acceleration as output is lower in comparison compared to that as input, the power output by tranny (torque) will be huge; if the rotation rate as output is not so lower in comparison compared to that as insight, on the other hand, the energy output by tranny (torque) will be small. Thus, to change the decrease ratio utilizing tranny is much comparable to the basic principle of moving things.
After that, how does a transmitting alter the reduction ratio ? The answer is based on the system called a planetary gear mechanism.
A planetary gear mechanism 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 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 small size and high performance such as transmission for automobiles.
The planetary speed reducer & gearbox is some sort of transmission mechanism. It utilizes the swiftness transducer of the gearbox to reduce the turnover number of the engine to the mandatory one and obtain a big torque. How 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 ring gear. The ring equipment is positioned in close get in touch with with the inner gearbox case. Sunlight equipment driven by the exterior power lies in the guts of the ring gear. Between your sun gear and band gear, there exists a planetary equipment set comprising three gears similarly built-up at the planet carrier, which is certainly floating among them relying on the support of the output shaft, ring gear and sun equipment. When the sun gear is certainly actuated by the input power, the planet gears will be powered to rotate and revolve around the guts combined with the orbit of the band gear. 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 whole lot of advantages, like little size, light weight, high load capability, lengthy service life, high reliability, low noise, huge output torque, wide selection of speed ratio, high efficiency and so on. Besides, the planetary speed reducers gearboxes in Ever-Power are created for sq . flange, which are easy and hassle-free for installation and ideal for AC/DC servo motors, stepper motors, hydraulic motors etc.
Because of these advantages, planetary gearboxes can be applied to the lifting transportation, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light and textile market, medical equipment, instrument and gauge, vehicle, 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 load would require that the electric motor torque, and therefore current, would have to be as many times greater as the reduction ratio which is 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 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 ideal for transmitting high torques as high as 120 Nm. Generally, the larger gearheads come with ball bearings at the gearhead output.
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 efficiency in the smallest of spaces
– High reduction ratio in an extremely small package
– Concentric gearhead input 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 less than 18 Arcmin. High torque, compact size and competitive price. 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 significantly less than 18 Arcmin. High torque, compact size and competitive cost. 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 distance from flange): 550N
4. Max shaft axial load: 500N
5. Backlash: 18 arcmin
6. Gear ratio from 3 to 216
7. Planetary gearbox length from 79 to 107mm
NEMA34 Precision type Planetary Gearbox for nema 34 Gear Stepper Engine 50N.m (6944oz-in) Rated Torque
This gear ratio is 5:1, if need other gear ratio, please contact us.
Input motor shaft demand :
suitable with standard nema34 stepper electric motor shaft 14mm diameter*32 size(Including pad elevation). (plane and Circular shaft and key shaft both available)
The difference between the economical and precision Nema34 planetary reducer:
To begin with: the financial and precise installation strategies are different. The input of the economical retarder assembly may be the keyway (ie the result shaft of the motor can be an assembleable keyway electric motor); the insight of the precision reducer assembly can be clamped and the input engine shaft is a set 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 have the same drawings and measurements. The main difference is: the material is different. Accurate gear devices are more advanced than economical gear units with regards to transmission efficiency and precision, as well as heat and noise and torque output balance.
Planetary Gear Transmission
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