Planetary Gear Transmission

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. Occasionally the term planetary gear train can be used broadly as a synonym for epicyclic gear train, or narrowly to point that the ring gear is the set member. In a straightforward planetary gear teach the pinions mesh concurrently with both coaxial gears (observe illustration). With the central gear set, a pinion rotates about it as a planet rotates about its sunlight, and the gears are named appropriately: the central gear is the sun, and the pinions will be the planets.
This is a compact, ‘single’ stage planetary gearset where in fact the output is derived from another ring gear varying a few teeth from the principal.
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 this size would have a decrease 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)
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 takes place in analogy to the orbiting of the planets in the solar system. This is how planetary gears obtained their name.
The elements of a planetary gear train could be split into four main constituents.
The housing with integrated internal teeth is 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. Sunlight pinion is usually mounted on a clamping system in order to offer the mechanical connection to the motor shaft. During procedure, the planetary gears, which are installed on a planetary carrier, roll between the sunlight pinion and the band gear. The planetary carrier also represents the output shaft of the gearbox.
The sole reason for the planetary gears is to transfer the mandatory torque. The number of teeth has no effect on the transmitting ratio of the gearbox. The number of planets can also vary. As the amount of planetary gears raises, the distribution of the strain increases and therefore the torque which can be transmitted. Increasing the amount of tooth engagements also decreases the rolling power. Since just part of the total 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. 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 includes 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. The smaller 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 sunlight 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 this case, 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 fix the drive shaft to be able to pick up the torque via the ring equipment. Planetary gearboxes have become extremely important in many areas of mechanical engineering.
They have become particularly more developed in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High Planetary Gear Transmission transmission ratios can also easily be performed with planetary gearboxes. Because of their positive properties and small 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 several planetary gears
High efficiency due to 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
Possibility of use as overriding gearbox
Favorable volume output
Suitability for a wide variety 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 gear 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 split into four main constituents.
The housing with integrated internal teeth is known as a ring gear. In the majority of cases the casing is fixed. The generating sun pinion can be in the center of the ring gear, and is coaxially arranged in relation to the output. The sun pinion is usually attached to a clamping system to be able to provide the mechanical link with the motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between the sun 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 required torque. The number 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 boosts, the distribution of the load increases and therefore the torque that can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since only section of the total result has to be transmitted as rolling power, a planetary equipment is extremely efficient. The benefit 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.
So long as the ring gear includes a continuous size, different ratios can be realized by varying the number of teeth of sunlight gear and the amount 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 sunlight gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting many planetary phases in series in the same band gear. In this instance, we talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a ring gear that is not fixed but is driven in virtually any direction of rotation. It is also possible to fix the drive shaft in order to grab the torque via the band gear. Planetary gearboxes have grown to be extremely important in many areas 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 transmitting ratios can also easily be performed with planetary gearboxes. Because of the positive properties and small 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 several planetary gears
High efficiency because of low rolling power
Almost unlimited transmission ratio options due to mixture of several planet stages
Suitable as planetary switching gear because of 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 is an automatic type gearbox where parallel shafts and gears arrangement from manual equipment box are replaced with an increase of compact and more reliable sun and planetary kind of gears arrangement and also the manual clutch from manual power teach is certainly replaced with hydro coupled clutch or torque convertor which in turn made the transmission automatic.
The thought 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) settings 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 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 obtained 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 traveling sun pinion is certainly in the heart of the ring equipment, and is coaxially organized in relation to the output. Sunlight pinion is usually attached to a clamping system in order to offer the mechanical link with the motor shaft. During procedure, the planetary gears, which are installed 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 number of teeth has no effect on the transmitting ratio of the gearbox. The number of planets may also vary. As the number of planetary gears boosts, the distribution of the load increases and then the torque which can be transmitted. Raising the number of tooth engagements also decreases the rolling power. Since only portion of the total output has to be transmitted as rolling power, a planetary gear is extremely efficient. The benefit 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 concise design using planetary gears.
Provided that the ring gear includes a constant size, different ratios can be realized by different the number of teeth of the sun gear and the amount of the teeth of the planetary gears. Small the sun gear, 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 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 could be overlaid by having a ring gear that is not fixed but is driven in virtually any direction of rotation. It is also possible to fix the drive shaft to be able to pick up the torque via the 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 transmission ratios may also easily be achieved with planetary gearboxes. Because of the positive properties and compact design, the gearboxes have 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
Almost unlimited transmission ratio options because of combination of several planet stages
Appropriate as planetary switching gear because of fixing this or that area of the gearbox
Chance for 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 electric motor. Having multiple teeth discuss the load also enables planetary gears to transmit high levels of torque. The combination of compact size, huge speed decrease and high torque transmitting makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive alternative than other gearbox types. And precision production is extremely important for these gearboxes. If one planetary equipment is positioned closer to the sun gear than the others, imbalances in the planetary gears can occur, resulting in premature wear and failure. Also, the small footprint of planetary gears makes warmth dissipation more difficult, so applications that run at 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 each other, although manufacturers provide right-angle designs that include other gear sets (frequently bevel gears with helical 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 linked to ratio and max output 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 system (or Epicyclic system since it is also known), consists normally of a centrally pivoted sunlight gear, a ring gear and several world gears which rotate between these.
This assembly concept explains the word planetary transmission, as the earth gears rotate around the sun gear as in the astronomical sense the planets rotate around our sun.
The advantage of a planetary transmission is determined by load distribution over multiple planet gears. It really is thereby feasible to transfer high torques utilizing a compact design.
Gear assembly 1 and gear assembly 2 of the Ever-Power 500/14 have two selectable sunlight gears. The first equipment step of the stepped world gears engages with sun gear #1. The next equipment step engages with sun gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sunlight equipment 1 with the ring 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), 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 jointly at the same velocity. The stepped planet gears usually 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 band gear 3 are straight coupled.
Many “gears” are utilized 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 an automobile plays : one is definitely to decelerate the high rotation velocity emitted by the engine to transmit to tires; the additional is to improve the reduction ratio in accordance with the acceleration / deceleration or traveling speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of generating 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 quickness to run, it is necessary to lessen 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 wheels 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 ? This is because substances need a large force to begin moving however they usually do not require this kind of a sizable 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 modify its output. For that reason, one adjusts its result by changing the decrease ratio employing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the amount of tooth of gears meshing with each other can be considered as the ratio of the distance of levers’ arms. That is, if the decrease ratio is huge 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 speed as output is not so lower in comparison to that as insight, on the other hand, the energy output by transmission (torque) will be little. Thus, to improve the decrease ratio utilizing transmission is much comparable to the principle of moving things.
After that, how does a transmission change the reduction ratio ? The answer lies in the mechanism called a planetary equipment mechanism.
A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It includes a very complex structure rendering its design or production most challenging; it can understand the high reduction ratio through gears, nevertheless, it really is a mechanism suitable for a reduction mechanism that requires both little size and powerful such as for example transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the swiftness transducer of the gearbox to lessen the turnover number of the electric motor to the mandatory one and get a big torque. How really does a planetary gearbox work? We can learn more about it from the structure.
The primary transmission structure of the planetary gearbox is planet gears, sun gear and ring gear. The ring gear is positioned in close contact with the internal gearbox case. The sun gear driven by the exterior power lies in the guts of the ring gear. Between the sun gear and band gear, there is a planetary equipment set consisting of three gears similarly built-up at the planet carrier, which is usually floating among them relying on the support of the result shaft, ring equipment and sun gear. When the sun equipment is usually actuated by the input power, the earth gears will be powered to rotate and revolve around the center along with the orbit of the band equipment. 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 whole lot of advantages, like small size, light weight, high load capability, lengthy service life, high reliability, low noise, huge output torque, wide selection of speed ratio, high efficiency and so on. Besides, the planetary velocity reducers gearboxes in Ever-Power are designed for square flange, which are easy and hassle-free for installation and suitable for AC/DC servo motors, stepper motors, hydraulic motors etc.
Due to these advantages, planetary gearboxes are applicable to the lifting transportation, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light and textile sector, medical equipment, instrument and gauge, automobile, ships, weapons, aerospace and other industrial 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 load would require that the engine torque, and thus current, would need to be as many times greater as the reduction ratio which can be used. Moog offers a selection of windings in each frame size that, combined with an array of reduction ratios, offers an range of solution to output requirements. Each combination of electric motor and gearhead offers unique advantages.
Precision Planetary Gearheads
gearheads
32 mm LOW PRICED 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 as high as 120 Nm. As a rule, the larger gearheads come with ball bearings at the gearhead output.
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 in an extremely small package
– Concentric gearhead insight 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, compact size and competitive price. The 16mm shaft diameter ensures stability 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, compact size and competitive price. The 16mm shaft diameter ensures balance in applications with belt transmitting. Fast mounting for your equipment.
1. Planetary ring equipment material: metal steel
2. Bearing at output type: Ball bearing
3. Max radial load (12mm 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 Engine 50N.m (6944oz-in) Rated Torque
This gear ratio is 5:1, if need other gear ratio, please e mail us.
Input motor shaft ask for :
suitable with regular nema34 stepper engine shaft 14mm diameter*32 size(Including pad height). (plane and Round 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 may be the keyway (ie the output shaft of the motor can be an assembleable keyway engine); the input of the precision reducer assembly is certainly clamped and the input engine shaft is a set or circular shaft or keyway. The shaft could be mounted (notice: the keyway shaft could be removed after 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 models are more advanced than economical gear units with regards to transmission efficiency and accuracy, in addition to heat and noise and torque output balance.