An assembly of meshed gears comprising a central or sun gear, a coaxial internal or ring gear, and a number of intermediate pinions supported on a revolving carrier. Sometimes the word planetary gear train is 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 the two coaxial gears (see illustration). With the central gear fixed, a pinion rotates about any of it as a world rotates about its sunlight, and the gears are called accordingly: the central gear is the sun, and the pinions will be the planets.
This is a concise, ‘single’ stage planetary gearset where in fact the output comes from another ring gear varying a few teeth from the principal.
With the initial style of 18 sun teeth, 60 ring teeth, and 3 planets, this resulted in a ‘single’ stage gear reduced amount of -82.33:1.
A regular planetary gearset of this size could have a reduction ratio of 4.33:1.
That is a whole lot 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 operate 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 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 generating sun pinion is usually in the heart of the ring gear, and is coaxially organized with regards to the output. The sun pinion is usually attached to a clamping system to be able to provide the mechanical connection to the engine shaft. During operation, 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 result 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 may also vary. As the number of planetary gears improves, the distribution of the load increases and then the torque that can be transmitted. Increasing 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 gear is incredibly efficient. The advantage of a planetary equipment 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 design using planetary gears.
So long as the ring gear has a continuous size, different ratios can be realized by various the number of teeth of sunlight gear and the number of the teeth of the planetary gears. The smaller the sun gear, the greater the ratio. Technically, a meaningful ratio range for a planetary stage is usually 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 stages in series in the same ring gear. In cases like this, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a ring gear that is not fixed but is driven in virtually any direction of rotation. Additionally it is possible to repair the drive shaft in order to pick up the torque via the ring gear. 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 can also easily be achieved with planetary gearboxes. Because of their positive properties and small 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 many planetary gears
High efficiency due to 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
Possibility of use as overriding gearbox
Favorable volume output
Suitability for an array of applications
Within an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference operate between a gear with internal teeth and a gear with 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 elements of a planetary gear train can be divided into four main constituents.
The housing with integrated internal teeth is known as a ring gear. In the majority of cases the casing is fixed. The driving sun pinion is usually in the heart of the ring gear, and is coaxially organized with regards to the output. Sunlight pinion is usually mounted on a clamping system in order to provide the mechanical link with the engine shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sun 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 has no 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 reduces the rolling power. Since only section of the total output needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The benefit of a planetary gear compared to a single spur gear is based on this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a concise 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 number of teeth of the planetary gears. The smaller the sun gear, the greater the ratio. Technically, a meaningful ratio range for a planetary stage can be approx. 3:1 to 10:1, since the planetary gears and the sun gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting a number of 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 set but is driven in virtually any direction of rotation. Additionally it is possible to fix the drive shaft in order to pick up the torque via the band gear. Planetary gearboxes have become extremely important in lots of areas 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 performed 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 several 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 section of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for an array of applications
Epicyclic gearbox can be an automatic type gearbox where parallel shafts and gears set up from manual equipment box are replaced with an increase of compact and more dependable sun and planetary type of gears arrangement and also the manual clutch from manual power teach is definitely replaced with hydro coupled clutch or torque convertor which in turn produced the transmission automatic.
The idea of epicyclic gear box is taken 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 based on 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 program. This is how planetary gears acquired their name.
The elements of a planetary gear train can 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 driving sun pinion can be in the heart of the ring gear, 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 the sunlight pinion and the band 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 amount 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. Increasing the amount of tooth engagements also decreases the rolling power. Since only part of the total result has to be transmitted as rolling power, a planetary equipment is incredibly efficient. The advantage of a planetary gear 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 style using planetary gears.
Provided that the ring gear includes a constant size, different ratios could be realized by varying the amount of teeth of the sun 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 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 instance, we speak of 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 any direction of rotation. It is also possible to fix the drive shaft in order 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 well established in areas where high output levels and fast speeds must 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 possess many potential uses in industrial applications.
The benefits of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to several planetary gears
High efficiency due to low rolling power
Nearly unlimited transmission ratio options due to combination 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 engaged at once, that allows high speed decrease to be achieved with fairly small gears and lower inertia reflected back to the electric motor. Having multiple teeth share the load also allows planetary gears to transmit high levels of torque. The combination of compact size, huge speed reduction and high torque transmission makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in style and manufacturing can make them a far more expensive solution than other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is positioned closer to sunlight gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failing. Also, the small footprint of planetary gears makes heat dissipation more difficult, therefore applications that run 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 integrate other gear sets (often bevel gears with helical tooth) to provide an offset between the input and output.
Input power (max)27 kW (36 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)12,880 Nm(9,500 lb-ft)
Output torque (continuous)8,135 Nm (6,000 lb-ft)
1 Actual ratio would depend 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 (not available with all ratios)
Approximate dry weight100 -181 kg (220 – 400 lb)4
Radial load (max)14,287kg (31,500 lb)3
Drive typeSpeed reducer
Hydraulic motor input SAE C or D hydraulic
A planetary transmission program (or Epicyclic system as it is also known), consists normally of a centrally pivoted sunlight gear, a ring equipment and several planet gears which rotate between these.
This assembly concept explains the term planetary transmission, as the planet gears rotate around sunlight 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 possible to transfer high torques utilizing a compact design.
Gear assembly 1 and gear assembly 2 of the Ever-Power 500/14 have two selectable sun gears. The first equipment step of the stepped planet gears engages with sun gear #1. The next equipment step engages with sunlight gear #2. With sun gear one or two 2 coupled to the axle,or the coupling of sun equipment 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 equipment assy (1) or (2), the sun gear 1 is coupled with the ring gear in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and ring gear then rotate with each other at the same swiftness. The stepped planet gears do not unroll. Hence 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 used for many other machines. The most typical one is the “tranny” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one is to decelerate the high rotation velocity emitted by the engine to transmit to tires; the other is to improve the reduction ratio relative to the acceleration / deceleration or traveling speed of a car.
The rotation speed of an automobile’s engine in the overall state of traveling amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation rate to run, it is required to lower the rotation speed utilizing 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 named the reduction ratio.
Then, why is it necessary to alter the reduction ratio relative to the acceleration / deceleration or driving speed ? The reason being substances require a large force to start moving however they usually do not require such a large force to excersice once they have started to move. Automobile could 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 utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the number of teeth of gears meshing with each other can be deemed as the ratio of the distance of levers’ arms. That’s, if the decrease ratio is huge and the rotation speed as output is lower in comparison compared to that as insight, the power output by tranny (torque) will be huge; if the rotation quickness as output isn’t so low in comparison compared to that as input, however, the power output by transmission (torque) will be little. Thus, to improve the reduction ratio utilizing transmitting is much comparable to the principle of moving things.
Then, how does a transmitting change the reduction ratio ? The answer is based on the system called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism 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 structure rendering its style or production most difficult; it can recognize the high reduction ratio through gears, however, it is a mechanism suited to a reduction mechanism that requires both little size and powerful such as transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the velocity transducer of the gearbox to reduce the turnover amount of the electric motor to the required one and obtain a big torque. How does a planetary gearbox work? We are able to find out more about it from the framework.
The main transmission structure of the planetary gearbox is planet gears, sun gear and ring gear. The ring gear is located in close contact with the inner gearbox case. Sunlight gear driven by the external power lies in the guts of the ring equipment. Between the sun gear and ring gear, there is a planetary equipment set consisting of three gears similarly built-up at the earth carrier, which is definitely floating among them relying on the support of the result shaft, ring gear and sun gear. When sunlight gear is definitely actuated by the input power, the planet gears will be powered to rotate and revolve around the center combined with the orbit of the band gear. The rotation of the earth gears drives the output shaft linked with the carrier to output the power.
Planetary speed reducer applications
Planetary speed reducers & gearboxes have a lot of advantages, like small size, light weight, high load capability, lengthy service life, high reliability, low noise, large output torque, wide range of speed ratio, high efficiency and so forth. Besides, the planetary rate reducers gearboxes in Ever-Power are created for sq . flange, which are easy and easy 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, building machinery, light and textile sector, medical equipment, instrument and gauge, vehicle, ships, weapons, aerospace and other industrial 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 thus 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 assortment of solution to output requirements. Each combination 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 Planetary Gear Transmission gearheads are ideal for transmitting high torques as high as 120 Nm. As a rule, 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 overall performance in the tiniest of spaces
– High reduction ratio within an extremely small package
– Concentric gearhead input 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, small size and competitive price. The 16mm shaft diameter ensures balance in applications with belt transmission. 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, compact size and competitive price. The 16mm shaft diameter ensures stability in applications with belt tranny. Fast mounting for your equipment.
1. Planetary ring gear material: metal steel
2. Bearing at output type: Ball bearing
3. Max radial load (12mm range from flange): 550N
4. Max shaft axial load: 500N
5. Backlash: 18 arcmin
6. Gear ratio from 3 to 216
7. Planetary gearbox 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 contact us.
Input motor shaft demand :
suitable with standard nema34 stepper electric motor shaft 14mm diameter*32 length(Including pad height). (plane and Circular shaft and essential shaft both available)
The difference between your economical and precision Nema34 planetary reducer:
First of all: the economic and precise installation methods are different. The insight of the economical retarder assembly is the keyway (ie the result shaft of the motor is an assembleable keyway electric motor); 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 can be removed after the key is removed).
Second, the economical and precision planetary gearboxes have the same drawings and dimensions. The primary difference is: the materials differs. Accurate gear devices are superior to economical gear units when it comes to transmission efficiency and accuracy, in addition to heat and sound and torque output balance.