An assembly of meshed gears consisting of a central or sun gear, a coaxial inner or ring gear, and one or more intermediate pinions supported on a revolving carrier. Sometimes the word planetary gear train can be used broadly as a synonym for epicyclic gear teach, or narrowly to point that the ring gear is the fixed member. In a straightforward planetary gear train the pinions mesh concurrently with both coaxial gears (discover illustration). With the central gear set, a pinion rotates about it as a planet rotates about its sunlight, and the gears are called appropriately: the central gear is the sunlight, and the pinions are the planets.
This is a concise, ‘single’ stage planetary gearset where the output comes from a second ring gear varying a few teeth from the primary.
With the initial model of 18 sun teeth, 60 band teeth, and 3 planets, this resulted in a ‘single’ stage gear reduced amount of -82.33:1.
A normal planetary gearset of the size could have a decrease ratio of 4.33:1.
That is a whole lot 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 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 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 program. This is one way planetary gears acquired their name.
The components of a planetary gear train can 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 usually 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 to be able to offer the mechanical connection to the electric motor shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between your sunlight pinion and the ring 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 amount of teeth does not have any effect on the tranny ratio of the gearbox. The number of planets can also vary. As the amount of planetary gears increases, the distribution of the load increases and then the torque that can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since just area of the total result has to be transmitted as rolling power, a planetary equipment is incredibly efficient. The advantage of a planetary equipment compared to a single spur gear lies in this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a concise style using planetary gears.
Provided that the ring gear has a constant size, different ratios could be realized by different 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, because the planetary gears and sunlight gear are extremely little above and below these ratios. Higher ratios can be acquired by connecting a number of planetary phases in series in the same band gear. In this case, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a band gear that’s not set but is driven in virtually any direction of rotation. 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 well established in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios may also easily be achieved with planetary gearboxes. Because of the positive properties and compact 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
Nearly unlimited transmission ratio options due to mixture 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 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 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 generating sun pinion is usually in the heart of the ring equipment, and is coaxially arranged with regards to the output. The sun pinion is usually attached to a clamping system in order to provide the mechanical link with the electric motor shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between your sunlight 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 mandatory 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 improves, the distribution of the load increases and therefore the torque which can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since just part of the total result needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The advantage of a planetary equipment 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 compact design using planetary gears.
Provided that 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. Small the sun gear, 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 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 ring 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 pick up the torque via the ring gear. Planetary gearboxes have become extremely important in lots of areas of mechanical engineering.
They have grown to be particularly well established in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High transmitting ratios can also easily be achieved with planetary gearboxes. Because of the positive properties and compact design, the gearboxes have many potential uses in commercial applications.
The benefits 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
Ideal 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 variety of applications
Epicyclic gearbox can be an automatic type gearbox in which parallel shafts and gears set up from manual gear box are replaced with more compact and more reliable sun and planetary kind of gears arrangement and also the manual clutch from manual power teach is definitely replaced with hydro coupled clutch or torque convertor which produced the transmission automatic.
The thought of epicyclic gear box is taken from the solar system which is considered to an ideal 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 according to the need of the drive.
Within an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference operate between a gear with internal teeth and a gear with exterior teeth on a concentric orbit. The circulation of the spur equipment takes place in analogy to the orbiting of the planets in the solar system. This is how planetary gears obtained their name.
The parts of a planetary gear train could be divided into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In the majority of cases the housing is fixed. The traveling sun pinion is certainly in the center of the ring gear, and is coaxially organized with regards to the output. Sunlight pinion is usually attached to a clamping system to be able to provide the mechanical connection to the electric motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sunlight pinion and the ring equipment. The planetary carrier also represents the result 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 number of planets can also vary. As the amount of planetary gears increases, the distribution of the strain increases and therefore the torque which can be transmitted. Raising the amount of tooth engagements also decreases the rolling power. Since only portion of the total result has to be transmitted as rolling power, a planetary equipment is extremely efficient. The advantage of a planetary gear compared to a single spur gear is based on this load distribution. Hence, it is possible 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 various the amount of teeth of the sun gear and the amount of teeth of the planetary gears. Small the sun equipment, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is certainly approx. 3:1 to 10:1, because the planetary gears and sunlight gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting several planetary levels in series in the same ring gear. In cases like this, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a band gear that 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 many 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 can also easily be performed with planetary gearboxes. Because of the positive properties and small design, the gearboxes possess many potential uses in commercial applications.
The benefits of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to several planetary gears
High efficiency because of low rolling power
Nearly unlimited transmission ratio options because of combination of several planet stages
Suitable as planetary switching gear due to fixing this or that portion of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
In a planetary gearbox, many teeth are engaged at once, which allows high speed decrease to be performed with fairly small gears and lower inertia reflected back to the engine. Having multiple teeth reveal the load also enables planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque transmission makes planetary gearboxes a favorite choice for Planetary Gear Transmission space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in style and manufacturing tends to make them a more expensive solution than other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the compact footprint of planetary gears makes temperature dissipation more difficult, therefore applications that operate at very high speed or experience continuous operation may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment must be inline with one another, although manufacturers provide right-angle designs that incorporate other gear sets (frequently 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 would depend on the drive configuration.
2 Max input speed related to ratio and max result speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (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 system (or Epicyclic system since it is also 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 sunlight gear as in the astronomical sense the planets rotate around our sun.
The benefit of a planetary transmission is determined by load distribution over multiple planet gears. It really is thereby possible to transfer high torques utilizing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power 500/14 have two selectable sunlight gears. The first gear step of the stepped world gears engages with sunlight gear #1. The second equipment 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 ring gear, three ratio variations are achievable with each equipment assembly.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment selected in gear assy (1) or (2), the sun gear 1 is in conjunction with the ring gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate with each other at the same acceleration. The stepped planet gears usually do not unroll. Thus the apparatus 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 used for automobiles, but they are also utilized for many additional machines. The most typical one may be the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one is certainly to decelerate the high rotation rate emitted by the engine to transmit to tires; the various other is to change the reduction ratio relative to the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the general state of traveling amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is unattainable to rotate tires with the same rotation acceleration to perform, it is required to lessen the rotation speed utilizing the ratio of the number of gear teeth. This kind of a role is named deceleration; the ratio of the rotation swiftness of engine and that of wheels is called the reduction ratio.
Then, why is it necessary to alter the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to start moving however they do not require such a huge force to excersice once they have began to move. Automobile can be cited as an example. An engine, however, by its nature can’t so finely modify its output. For that reason, one adjusts its output 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 tooth of gears meshing with one another can be deemed as the ratio of the length of levers’ arms. That’s, if the decrease ratio is large and the rotation swiftness as output is lower in comparison to that as insight, the energy output by tranny (torque) will be huge; if the rotation rate as output is not so lower in comparison to that as input, however, the power output by transmitting (torque) will be small. Thus, to improve the decrease ratio utilizing tranny is much comparable to the theory of moving things.
After that, how does a transmitting change the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism comprising 4 components, namely, sunlight gear A, several planet gears B, internal gear C and carrier D that connects planet gears as observed in the graph below. It has a very complex framework rendering its design or production most challenging; it can recognize the high reduction ratio through gears, nevertheless, it is a mechanism suitable for a reduction system 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 rate transducer of the gearbox to lessen the turnover number of the electric motor to the required one and get a huge torque. How really does a planetary gearbox work? We are able to 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 external power lies in the guts of the ring equipment. Between your sun gear and ring gear, there exists a planetary gear set comprising three gears similarly built-up at the earth carrier, which is certainly floating among them counting on the support of the result shaft, ring gear and sun equipment. When sunlight equipment is actuated by the input power, the planet gears will be powered to rotate and then revolve around the center combined with the orbit of the band equipment. 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 whole lot of advantages, like little size, light weight, high load capability, lengthy service life, high reliability, low noise, huge output torque, wide range of speed ratio, high efficiency and so forth. Besides, the planetary acceleration reducers gearboxes in Ever-Power are created for sq . flange, which are easy and convenient 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 transportation, engineering machinery, metallurgy, mining, petrochemicals, structure machinery, light and textile sector, medical equipment, device and gauge, vehicle, ships, weapons, aerospace and other commercial 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 strain would require that the electric motor torque, and therefore current, would have to be as many times greater as the reduction ratio which can be used. Moog offers a selection of windings in each framework size that, coupled with an array of reduction ratios, offers an range of solution to result requirements. Each combination of engine 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 ideal for transmitting high torques of up to 120 Nm. Generally, the larger gearheads include ball bearings at the gearhead output.
Properties of the Ever-Power planetary gearhead:
– For transmitting of high torques up to 180 Nm
– Reduction ratios from 4:1 to 6285:1
– High performance 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, small size and competitive cost. The 16mm shaft diameter ensures stability in applications with belt transmitting. Fast mounting 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 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 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 size(Including pad height). (plane and Circular shaft and essential shaft both available)
The difference between the economical and precision Nema34 planetary reducer:
First of all: the financial and precise installation methods are different. The input of the economical retarder assembly is the keyway (ie the result shaft of the engine can be an assembleable keyway 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 can be mounted (notice: the keyway shaft could be removed following the key is removed).
Second, the economical and precision planetary gearboxes have the same drawings and sizes. The main difference is: the material differs. Accurate gear products are more advanced than economical gear units when it comes to transmission efficiency and precision, and also heat and sound and torque output stability.