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June 29, 2020

An assembly of meshed gears consisting of a central or sun equipment, a coaxial internal or ring gear, and one or more intermediate pinions supported on a revolving carrier. Sometimes the term planetary gear teach is utilized broadly as a synonym for epicyclic equipment teach, or narrowly to point that the ring gear is the set member. In a straightforward planetary gear train the pinions mesh concurrently with both coaxial gears (observe illustration). With the central gear fixed, a pinion rotates about any of it as a world rotates about its sunlight, and the gears are named accordingly: the central gear is the sun, and the pinions are 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 primary.
With the initial style of 18 sun teeth, 60 band teeth, and 3 planets, this resulted in a ‘single’ stage gear reduction of -82.33:1.
A normal planetary gearset of this size would 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
Result 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 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 program. This is how planetary gears acquired their name.
The elements of a planetary gear train could be split into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In nearly all cases the casing is fixed. The traveling sun pinion is usually in the heart of the ring gear, and is coaxially arranged in relation to the output. Sunlight pinion is usually mounted on a clamping system to be able to offer 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 ring equipment. 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 does not have any effect on the tranny ratio of the gearbox. The number of planets may also vary. As the number of planetary gears increases, the distribution of the strain increases and therefore the torque which can be transmitted. Increasing the amount of tooth engagements also reduces the rolling power. Since just portion 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. It is therefore feasible to transmit high torques wit
h high efficiency with a concise design using planetary gears.
Provided that the ring gear has a continuous size, different ratios could be realized by varying the number of teeth of sunlight 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 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 many 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 ring gear that is not set but is driven in any direction of rotation. Additionally it is possible to repair the drive shaft in order to grab the torque via the band gear. Planetary gearboxes have grown to be 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 Planetary Gear Transmission inertia ratio adaptation. High tranny ratios may also easily be achieved with planetary gearboxes. Because of their positive properties and small design, the gearboxes have many potential uses in industrial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to many planetary gears
High efficiency because of low rolling power
Almost unlimited transmission ratio options because of combination of several planet stages
Ideal as planetary switching gear due to fixing this or that portion of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for an array of applications
In an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference run between a gear with internal teeth and a gear with external teeth on a concentric orbit. The circulation of the spur equipment occurs in analogy to the orbiting of the planets in the solar system. This is 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 known as a ring gear. In nearly all cases the housing is fixed. The driving sun pinion can be 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 in order to offer the mechanical connection to the motor shaft. During operation, the planetary gears, which are installed on a planetary carrier, roll between your sun pinion and the ring gear. The planetary carrier also represents the result shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the required torque. The amount of teeth does not have any effect on the transmission 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 then the torque that can be transmitted. Increasing the amount of tooth engagements also decreases the rolling power. Since only area 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. 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 could be realized by various the amount of teeth of the sun gear and the number of the teeth of the planetary gears. Small 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 small 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 speak of 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 any direction of rotation. It is also possible to repair 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 should be transmitted with favorable mass inertia ratio adaptation. High tranny ratios can also easily be performed with planetary gearboxes. Because of the positive properties and compact design, the gearboxes possess 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 mixture of several planet stages
Suitable as planetary switching gear due to fixing this or that part of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
Suitability for a wide range of applications
Epicyclic gearbox is an automatic type gearbox where parallel shafts and gears set up from manual gear box are replaced with more compact and more dependable sun and planetary kind of gears arrangement and also the manual clutch from manual power train is certainly replaced with hydro coupled clutch or torque convertor which in turn made the transmission automatic.
The idea of epicyclic gear box is taken from the solar system which is known as to an ideal 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 according to the require of the drive.
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 exterior teeth on a concentric orbit. The circulation of the spur gear takes place in analogy to the orbiting of the planets in the solar program. This is one way planetary gears obtained their name.
The elements of a planetary gear train 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 driving sun pinion is usually in the center of the ring equipment, and is coaxially organized with regards to the output. Sunlight pinion is usually attached to 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 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 transmission 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 that can be transmitted. Raising the amount of tooth engagements also decreases the rolling power. Since only portion of the total output needs 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 possible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
So long as the ring gear has a constant size, different ratios could be realized by varying the number of teeth of the sun 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 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 many planetary phases in series in the same band gear. In this case, we speak of multi-stage gearboxes.
With planetary gearboxes the speeds and torques could be overlaid by having a ring gear that’s not set but is driven in any direction of rotation. Additionally it is possible to repair 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 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 transmission ratios may also easily be achieved with planetary gearboxes. Because of their positive properties and compact design, the gearboxes possess 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 due to 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 section of the gearbox
Possibility of use as overriding gearbox
Favorable volume output
In a planetary gearbox, many teeth are engaged at once, that allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back to the engine. Having multiple teeth share the load also enables planetary gears to transmit high levels of torque. The mixture of compact size, large speed reduction and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive solution than various other gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary gear is put closer to sunlight gear than the others, imbalances in the planetary gears can occur, leading to premature wear and failing. Also, the compact footprint of planetary gears makes heat dissipation more difficult, therefore applications that operate 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 should be inline with each other, although manufacturers offer right-angle designs that integrate other gear sets (frequently 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 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 engine input SAE C or D hydraulic
A planetary transmission system (or Epicyclic system as it is also known), consists normally of a centrally pivoted sun gear, a ring gear and several world gears which rotate between these.
This assembly concept explains the term planetary transmission, as the earth gears rotate around sunlight gear as in the astronomical sense the planets rotate around our sun.
The benefit of a planetary transmission depends upon load distribution over multiple planet gears. It is thereby possible to transfer high torques employing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power 500/14 possess two selectable sun gears. The first equipment stage 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 sun gear 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 gear selected in gear assy (1) or (2), sunlight gear 1 is coupled 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 velocity. The stepped world gears do not unroll. Hence the apparatus 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 used for automobiles, however they are also utilized for many additional machines. The most typical one is the “transmitting” that conveys the energy of engine to tires. There are broadly two functions the transmission of an automobile plays : one is definitely to decelerate the high rotation speed emitted by the engine to transmit to tires; the additional is to change 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 traveling amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is not possible to rotate tires with the same rotation quickness to run, it is necessary to lower the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is called deceleration; the ratio of the rotation velocity of engine and that of tires is called the reduction ratio.
Then, exactly why is it necessary to change the reduction ratio relative to the acceleration / deceleration or driving speed ? The reason being substances need a large force to start moving however they usually do not require this kind of a huge force to excersice once they have began to move. Automobile could be cited as an example. An engine, however, by its character can’t so finely change its output. Consequently, one adjusts its output by changing the decrease ratio employing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with each other can be deemed as the ratio of the distance of levers’ arms. That’s, if the decrease ratio is large and the rotation acceleration as output is lower in comparison compared to that as input, the energy output by transmitting (torque) will be huge; if the rotation velocity as output isn’t 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 transmitting is much comparable to the principle of moving things.
After that, how does a tranny alter the reduction ratio ? The answer lies in the mechanism called a planetary gear mechanism.
A planetary gear mechanism is a gear system comprising 4 components, namely, sun gear A, several planet gears B, internal gear C and carrier D that connects world gears as observed in the graph below. It has a very complex structure rendering its style or production most difficult; it can realize the high reduction ratio through gears, however, it really is a mechanism suited to a reduction mechanism that requires both small size and high performance such as for example transmission for automobiles.
The planetary speed reducer & gearbox is some sort of transmission mechanism. It utilizes the quickness transducer of the gearbox to reduce the turnover amount of the engine to the mandatory one and obtain a big torque. How really does a planetary gearbox work? We can find out more about it from the framework.
The main transmission structure of the planetary gearbox is planet gears, sun gear and band gear. The ring equipment is situated in close get in touch with with the inner gearbox case. The sun gear driven by the exterior power lies in the center of the ring equipment. Between your sun gear and ring gear, there is a planetary equipment set consisting of three gears equally built-up at the planet carrier, which is definitely floating among them counting on the support of the output shaft, ring equipment and sun gear. When sunlight gear is certainly actuated by the input power, the planet gears will be driven to rotate and then revolve around the center combined with the orbit of the band gear. The rotation of the planet 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, long service life, high reliability, low noise, large output torque, wide variety of speed ratio, high efficiency and so forth. Besides, the planetary acceleration reducers gearboxes in Ever-Power are designed for square 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 can be applied to the lifting transport, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light and textile market, medical equipment, device and gauge, vehicle, ships, weapons, aerospace and other industrial sectors.
The primary reason to use a gearhead is that it makes it possible to regulate a big 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 therefore current, would have to be as many times higher as the reduction ratio which is used. Moog offers a selection of windings in each framework size that, combined with a selection of reduction ratios, provides an range of solution to output requirements. Each mixture 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 transmission 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 insight and output
Versions:
– Plastic version
– Ceramic version
– High-power gearheads
– Heavy-duty gearheads
– Gearheads with reduced backlash
80mm size inline planetary reducer for NEMA34 (flange 86mm) or NEMA42 stepper motor. Precision significantly less than 18 Arcmin. High torque, small size and competitive cost. 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, small size and competitive cost. The 16mm shaft diameter ensures stability in applications with belt transmitting. Fast installation 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 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 ask for :
suitable with standard nema34 stepper engine shaft 14mm diameter*32 size(Including pad height). (plane and Round shaft and key shaft both available)
The difference between the economical and precision Nema34 planetary reducer:
To begin with: the economic and precise installation methods are different. The input of the economical retarder assembly is the keyway (ie the output shaft of the electric motor is an assembleable keyway electric motor); the insight of the precision reducer assembly is definitely clamped and the input electric motor shaft is a set or circular shaft or keyway. The shaft can 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 dimensions. The primary difference is: the materials differs. Accurate gear units are superior to economical gear units when it comes to transmission efficiency and accuracy, as well as heat and noise and torque output balance.