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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 upon a revolving carrier. Occasionally the word planetary gear train can be used broadly as a synonym for epicyclic gear teach, or narrowly to indicate that the ring gear is the fixed member. In a simple planetary gear teach the pinions mesh simultaneously with the two coaxial gears (see illustration). With the central gear set, a pinion rotates about any of it as a planet rotates about its sun, and the gears are called accordingly: the central gear is the sunlight, and the pinions are 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 principal.
With the initial style 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 the 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
Output Shaft Support Dual Ball Bearing
Electrical Connection Man 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 run 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 how planetary gears acquired their name.
The elements 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 traveling sun pinion is in the heart of the ring gear, and is coaxially organized with regards to the output. The sun pinion is usually mounted on a clamping system to be able to offer the mechanical connection to the motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between the sunlight pinion and the ring equipment. 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 number of teeth does not have any effect on the transmission ratio of the gearbox. The amount of planets can also vary. As the amount of planetary gears raises, 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 part of the total output has to be transmitted as rolling power, a planetary equipment is extremely efficient. The benefit of a planetary gear compared to an individual spur gear lies in this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a compact style 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 number of tooth 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, 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 levels 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 ring gear that is not fixed but is driven in any direction of rotation. It is also possible to repair the drive shaft in order to grab the torque via the band equipment. Planetary gearboxes have become 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 should be transmitted with favorable mass inertia ratio adaptation. High transmission ratios can 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 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 stages
Appropriate as planetary switching gear due to fixing this or that part of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for an array of applications
In 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 equipment occurs in analogy to the orbiting of the planets in the solar system. This is one way planetary gears acquired their name.
The components of a planetary gear train could be divided into four main constituents.
The housing with integrated internal teeth is known as a ring gear. In nearly all cases the housing is fixed. The traveling sun pinion can be in the heart of the ring gear, 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 link with the motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between the 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 transmission ratio of the gearbox. The amount of planets may also vary. As the number of planetary gears raises, the distribution of the strain increases and therefore the torque which can be transmitted. Increasing the number of tooth engagements also reduces the rolling power. Since just part of the total Planetary Gear Transmission result has to be transmitted as rolling power, a planetary gear is extremely efficient. The advantage of a planetary equipment 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 style using planetary gears.
So long as the ring gear has a constant size, different ratios can 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 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 little above and below these ratios. Higher ratios can be acquired by connecting several planetary levels in series in the same band gear. In cases like this, 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 in order to grab the torque via the ring 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 transmission ratios can also easily be achieved with planetary gearboxes. Because of their positive properties and small design, the gearboxes have many potential uses in industrial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to several planetary gears
High efficiency because of low rolling power
Nearly unlimited transmission ratio options due to combination of several planet stages
Ideal as planetary switching gear due to fixing this or that section 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 set up from manual equipment box are replaced with an increase of compact and more dependable 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 made the transmission automatic.
The thought 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, Reverse, Drive, Sport) modes which is obtained by fixing of sun and planetary gears according to the require of the drive.
In 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 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 can 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 driving sun pinion can be in the heart of the ring gear, and is coaxially organized with regards to the output. Sunlight pinion is usually attached to a clamping system in order to offer the mechanical connection to the engine shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sun 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 has no effect on the tranny ratio of the gearbox. The number 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 number of tooth engagements also reduces the rolling power. Since only portion of the total output needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The advantage of a planetary gear compared to a single spur gear lies in this load distribution. Hence, it is possible to transmit high torques wit
h high efficiency with a concise design using planetary gears.
Provided that the ring gear has a continuous size, different ratios can be realized by varying the number of teeth of sunlight gear and the number of teeth of the planetary gears. The smaller 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 little above and below these ratios. Higher ratios can be obtained by connecting many planetary stages 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 ring gear that is not set but is driven in any direction of rotation. Additionally it is possible to repair the drive shaft to be able to pick up the torque via the ring gear. Planetary gearboxes have grown to be extremely important in lots of regions of mechanical engineering.
They have become particularly well established 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 their 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
Nearly unlimited transmission ratio options due to 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
In a planetary gearbox, many teeth are engaged at once, that allows high speed decrease to be achieved with fairly small gears and lower inertia reflected back to the motor. Having multiple teeth reveal the load also allows planetary gears to transmit high levels of torque. The mixture of compact size, large speed reduction and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in design and manufacturing tends to make them a far more expensive solution than other gearbox types. And precision production is extremely important for these gearboxes. If one planetary equipment is positioned closer to the sun gear compared to the others, imbalances in the planetary gears can occur, resulting in premature wear and failure. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that operate at very high speed or encounter continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers offer right-angle designs that include other gear sets (often bevel gears with helical the teeth) to provide 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 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 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 equipment and several world gears which rotate between these.
This assembly concept explains the term planetary transmission, as the planet 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 really 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 stage of the stepped planet gears engages with sunlight gear #1. The next gear step engages with sunlight gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sun gear 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 band gear then rotate jointly at the same swiftness. The stepped planet gears usually do not unroll. Thus the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sun gear 3 and ring gear 3 are directly coupled.
Many “gears” are utilized for automobiles, but they are also used for many other machines. The most typical one may be the “transmitting” that conveys the power of engine to tires. There are broadly two roles the transmission of a car plays : one is to decelerate the high rotation rate 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 a car.
The rotation speed of an automobile’s engine in the overall state of generating amounts to at least one 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 perform, it is necessary to lessen the rotation speed using the ratio of the amount of gear teeth. Such a role is named deceleration; the ratio of the rotation rate of engine and that of tires is called the reduction ratio.
Then, exactly why is it necessary to change the reduction ratio in accordance with the acceleration / deceleration or driving speed ? The reason being substances need a large force to start moving however they usually 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, however, by its character can’t so finely change its output. As a result, one adjusts its result by changing the reduction ratio employing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with each other can be considered as the ratio of the length of levers’ arms. That is, if the decrease ratio is large and the rotation swiftness as output is low in comparison to that as input, the power output by transmitting (torque) will be large; if the rotation swiftness as output is not so lower in comparison to that as input, however, the energy output by transmitting (torque) will be small. Thus, to change the reduction ratio utilizing transmission is much akin to the principle of moving things.
After that, how does a transmission modify the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sunlight gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It has a very complex framework rendering its design or production most difficult; it can understand the high decrease ratio through gears, however, it is a mechanism suited to 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 quickness transducer of the gearbox to reduce the turnover amount of the motor to the mandatory one and obtain a big torque. How 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 band gear. The ring equipment is positioned in close contact with the internal gearbox case. The sun equipment driven by the exterior power lies in the guts of the ring gear. Between the sun gear and band gear, there exists a planetary gear set comprising three gears equally built-up at the earth carrier, which can be floating among them relying on the support of the result shaft, ring equipment and sun equipment. When sunlight gear is actuated by the input power, the earth gears will be driven to rotate and then revolve around the center combined with the orbit of the band gear. The rotation of the earth gears drives the output shaft connected with the carrier to result 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 rate reducers gearboxes in Ever-Power are created 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 transportation, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light and textile market, medical equipment, instrument and gauge, car, ships, weapons, aerospace and other commercial sectors.
The primary reason to use a gearhead is that it creates it possible to control a sizable load inertia with a comparatively small motor inertia. Without the gearhead, acceleration or velocity control of the strain would require that the motor torque, and therefore current, would have to be as much times better as the reduction ratio which is used. Moog offers an array of windings in each frame size that, coupled with a selection of reduction ratios, offers an assortment of solution to result requirements. Each combination of engine 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 of up to 120 Nm. Generally, the larger gearheads include ball bearings at the gearhead result.
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 functionality in the smallest 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 less than 18 Arcmin. High torque, compact size and competitive cost. The 16mm shaft diameter ensures balance in applications with belt transmitting. 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 transmitting. Fast installation for your equipment.
1. Planetary ring gear material: metal steel
2. Bearing at result 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 Electric motor 50N.m (6944oz-in) Rated Torque
This gear ratio is 5:1, if need other gear ratio, please e mail us.
Input motor shaft demand :
suitable with standard nema34 stepper engine shaft 14mm diameter*32 duration(Including pad height). (plane and Round shaft and essential shaft both available)
The difference between the economical and precision Nema34 planetary reducer:
To begin with: the economic and precise installation strategies are different. The input of the cost-effective retarder assembly may be the keyway (ie the result shaft of the motor can be an assembleable keyway motor); the insight of the precision reducer assembly is clamped and the input motor shaft is a flat or circular shaft or keyway. The shaft could be mounted (note: 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 primary difference is: the material is different. Accurate gear systems are superior to economical gear units with regards to transmission efficiency and precision, and also heat and sound and torque output balance.

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