An assembly of meshed gears consisting of a central or sun gear, a coaxial internal or ring equipment, 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 gear train, 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 (find illustration). With the central gear set, a pinion rotates about any of it as a world rotates about its sun, and the gears are named appropriately: the central gear is the sunlight, and the pinions will be the planets.
This is a compact, ‘single’ stage planetary gearset where in fact the output comes from a second 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 the 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 Male 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 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 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 generating sun pinion is 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 in order to provide the mechanical connection to the engine shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between the 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 mandatory torque. The number of teeth has no effect on the transmitting ratio of the gearbox. The amount of planets can also vary. As the number 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 reduces the rolling power. Since just section of the total output has to be transmitted as rolling power, a planetary gear is extremely efficient. The advantage of a planetary gear compared to an individual spur gear is based on this load distribution. It is therefore feasible to transmit high torques wit
h high efficiency with a concise design using planetary gears.
So long as the ring gear has a continuous size, different ratios can be realized by different the number of teeth of the sun gear and the amount of tooth 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 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 cases like this, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by Planetary Gear Transmission having a ring gear that’s not fixed but is driven in virtually any direction of rotation. Additionally it is 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 many areas 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 transmission ratios may also easily be achieved with planetary gearboxes. Because of their positive properties and compact design, the gearboxes have many potential uses in commercial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to many planetary gears
High efficiency because of low rolling power
Nearly unlimited transmission ratio options due to mixture of several planet stages
Appropriate as planetary switching gear due to fixing this or that area of the gearbox
Chance for 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 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 how planetary gears acquired their name.
The parts 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 housing 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 mounted on a clamping system in order to provide the mechanical link with the electric motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between the sun 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 required 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 amount of planetary gears improves, the distribution of the load increases and therefore the torque that can be transmitted. Increasing the number of tooth engagements also reduces the rolling power. Since just area of the total result needs 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 concise style using planetary gears.
Provided that the ring gear includes a continuous size, different ratios could be realized by varying the amount of teeth of the sun gear and the number 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 definitely 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 acquired by connecting many 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 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 in order to grab the torque via the band gear. Planetary gearboxes have become extremely important in lots of areas of mechanical engineering.
They have become particularly well established 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 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 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 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 is an automatic type gearbox where parallel shafts and gears set up from manual gear 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 replaced with hydro coupled clutch or torque convertor which 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 comes with 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 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 how planetary gears acquired their name.
The parts of a planetary gear train can be split into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In the majority of cases the housing is fixed. The traveling sun pinion is definitely in the heart of the ring equipment, and is coaxially arranged 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 motor shaft. During operation, the planetary gears, which are mounted on a planetary carrier, roll between the sun pinion and the band equipment. The planetary carrier also represents the output shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the mandatory torque. The amount of teeth has no effect on the transmission ratio of the gearbox. The number of planets may also vary. As the number of planetary gears improves, the distribution of the strain increases and then the torque that can be transmitted. Raising the number of tooth engagements also reduces the rolling power. Since only section of the total output has to be transmitted as rolling power, a planetary gear is incredibly efficient. The benefit of a planetary gear compared to an individual spur gear is based on this load distribution. It is therefore feasible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
Provided that the ring gear has a constant size, different ratios can be realized by various the number of teeth of the sun gear and the amount of tooth 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, since the planetary gears and the sun gear are extremely little above and below these ratios. Higher ratios can be acquired by connecting many planetary stages in series in the same band gear. In this instance, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques can be overlaid by having a band gear that’s not fixed but is driven in virtually any direction of rotation. It is also possible to fix the drive shaft in order to pick up the torque via the ring gear. Planetary gearboxes have become extremely important in many regions of mechanical engineering.
They have become particularly more developed in areas where high output levels and fast speeds must be transmitted with favorable mass inertia ratio adaptation. High tranny ratios can 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 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 due to fixing this or that section of the gearbox
Possibility of 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 relatively small gears and lower inertia reflected back to the engine. Having multiple teeth share the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, large speed reduction and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in style and manufacturing tends to 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 the sun gear than the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the small footprint of planetary gears makes heat dissipation more difficult, so applications that operate at high speed or encounter continuous procedure may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the driven equipment must be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical tooth) to supply 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 output speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable with all ratios)
Approximate dry weight100 -181 kg (220 – 400 lb)4
Radial load (max)14,287kg (31,500 lb)3
Drive typeSpeed reducer
Hydraulic engine input SAE C or D hydraulic
A planetary transmission program (or Epicyclic system since it can be known), consists normally of a centrally pivoted sunlight gear, a ring equipment and several planet gears which rotate between these.
This assembly concept explains the word planetary transmission, as the earth 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 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 sunlight 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 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 coupled with the ring equipment in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and ring gear then rotate together at the same swiftness. The stepped planet gears do not unroll. Therefore the gear 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, however they are also utilized for many various other machines. The most typical one may be the “tranny” that conveys the energy of engine to tires. There are broadly two roles the transmission of an automobile plays : one is certainly to decelerate the high rotation rate emitted by the engine to transmit to tires; the various other is to improve the reduction ratio in accordance with the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the general state of generating amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is unattainable to rotate tires with the same rotation speed to perform, it is required to lower the rotation speed utilizing the ratio of the amount of gear teeth. Such a role is called deceleration; the ratio of the rotation speed of engine and that of tires is named the reduction ratio.
Then, why is it necessary to alter the reduction ratio in accordance with the acceleration / deceleration or driving speed ? The reason being substances need a large force to begin moving however they do not require such a big force to keep moving once they have started to move. Automobile could be cited as an example. An engine, however, by its nature can’t so finely modify its output. As a result, one adjusts its result by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the number of teeth of gears meshing with one another can be considered as the ratio of the space of levers’ arms. That is, if the reduction ratio is large and the rotation speed as output is low in comparison compared to that as insight, the power output by tranny (torque) will be huge; if the rotation quickness as output is not so low in comparison to that as insight, on the other hand, the energy output by tranny (torque) will be little. Thus, to change the decrease ratio utilizing tranny is much akin to the principle of moving things.
Then, how does a tranny change the reduction ratio ? The answer lies in the system called a planetary equipment mechanism.
A planetary gear mechanism is a gear system comprising 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 has a very complex structure rendering its design or production most challenging; it can understand 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 transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the acceleration transducer of the gearbox to lessen the turnover amount of the motor to the mandatory one and obtain a huge torque. How will a planetary gearbox work? We are able to find out more about it from the structure.
The primary transmission structure of the planetary gearbox is planet gears, sun gear and ring gear. The ring gear is situated in close contact with the internal gearbox case. The sun gear driven by the external power lies in the guts of the ring gear. Between your sun gear and ring gear, there is a planetary gear set consisting of three gears similarly built-up at the planet carrier, which is certainly floating among them counting on the support of the result shaft, ring gear and sun equipment. When the sun gear is definitely actuated by the insight power, the planet gears will be driven to rotate and then revolve around the guts combined with the orbit of the band gear. The rotation of the planet gears drives the output shaft connected with the carrier to output the power.
Planetary speed reducer applications
Planetary speed reducers & gearboxes have a lot of advantages, like little size, light weight, high load capability, long service life, high reliability, low noise, large output torque, wide variety of speed ratio, high efficiency and so forth. Besides, the planetary speed reducers gearboxes in Ever-Power are created for sq . 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, structure machinery, light and textile sector, medical equipment, instrument and gauge, car, ships, weapons, aerospace and other industrial sectors.
The primary reason to employ a gearhead is that it makes it possible to control a sizable load inertia with a comparatively small motor inertia. Without the gearhead, acceleration or velocity control of the load would require that the motor torque, and therefore current, would need to be as much times better as the decrease ratio which can be used. Moog offers a selection of windings in each framework size that, combined with a selection of reduction ratios, offers an assortment of solution to result requirements. Each mixture of electric motor and gearhead offers exclusive advantages.
Precision Planetary Gearheads
gearheads
32 mm Low Cost Planetary Gearhead
32 mm Precision Planetary Gearhead
52 mm Precision Planetary Gearhead
62 mm Precision Planetary Gearhead
81 mm Precision Planetary Gearhead
120 mm Precision Planetary Gearhead
Planetary gearheads are suitable for transmitting high torques of up to 120 Nm. Generally, the larger gearheads 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 efficiency 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 minimal backlash
80mm size inline planetary reducer for NEMA34 (flange 86mm) or NEMA42 stepper motor. Precision significantly less than 18 Arcmin. High torque, small size and competitive 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 significantly less than 18 Arcmin. High torque, compact size and competitive cost. The 16mm shaft diameter ensures stability in applications with belt tranny. Fast mounting for your equipment.
1. Planetary ring equipment 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 duration 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 motor shaft 14mm diameter*32 length(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 economic and precise installation strategies are different. The insight of the economical retarder assembly is the keyway (ie the result shaft of the motor is an assembleable keyway engine); the input of the precision reducer assembly is certainly clamped and the input motor 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 primary difference is: the materials is different. Accurate gear units are more advanced than economical gear units with regards to transmission efficiency and precision, along with heat and noise and torque output balance.
