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Planetary Gear Transmission

An assembly of meshed gears consisting of a central or sun gear, a coaxial internal or ring gear, and one or more intermediate pinions supported upon a revolving carrier. Sometimes the term planetary gear train is utilized broadly as a synonym for epicyclic equipment teach, or narrowly to indicate that the ring equipment is the set member. In a straightforward planetary gear teach the pinions mesh simultaneously with the two coaxial gears (find illustration). With the central equipment set, a pinion rotates about it as a planet rotates about its sunlight, and the gears are called accordingly: the central gear may be the sunlight, and the pinions are the planets.
This is a concise, ‘single’ stage planetary gearset where 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 reduction of -82.33:1.
A regular planetary gearset of this size would have a decrease ratio of 4.33:1.
That is a good deal 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 operate between a gear with internal teeth and a gear with exterior 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 obtained 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 is in the heart of the ring gear, and is coaxially organized in relation to the output. The sun pinion is usually mounted on a clamping system in order to offer the mechanical link with the electric motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sunlight pinion and the ring equipment. The planetary carrier also represents the 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 may also vary. As the number of planetary gears increases, the distribution of the strain increases and then the torque that can be transmitted. Increasing the number of tooth engagements also decreases the rolling power. Since just area of the total result needs 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. 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 constant size, different ratios can be realized by various the amount of teeth of the sun gear and the amount of tooth of the planetary gears. Small the sun gear, the higher the ratio. Technically, a meaningful ratio range for a planetary stage can be approx. 3:1 to 10:1, Planetary Gear Transmission Because the planetary gears and sunlight gear are extremely small above and below these ratios. Higher ratios can be obtained 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's not set 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 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 tranny ratios may also easily be performed with planetary gearboxes. Because of their 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 because of low rolling power
Almost unlimited transmission ratio options due to combination of several planet stages
Ideal as planetary switching gear due to fixing this or that portion 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 operate between a gear with internal teeth and a gear with exterior teeth on a concentric orbit. The circulation of the spur equipment takes place in analogy to the orbiting of the planets in the solar system. This is one way planetary gears acquired their name.
The elements of a planetary gear train could be divided 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 is certainly in the center of the ring gear, and is coaxially arranged in relation to the output. Sunlight pinion is usually mounted on a clamping system in order to offer the mechanical link with the motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sunlight pinion and the ring gear. The planetary carrier also represents the output shaft of the gearbox.
The sole reason for the planetary gears is to transfer the required torque. The number of teeth does not have any effect on the transmission ratio of the gearbox. The amount of planets may also vary. As the amount of planetary gears improves, the distribution of the strain increases and therefore the torque which can be transmitted. Raising the amount of tooth engagements also decreases the rolling power. Since just section of the total result has to be transmitted as rolling power, a planetary gear is incredibly efficient. The benefit of a planetary equipment compared to a single spur gear lies in this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a compact design using planetary gears.
So long as the ring gear has a continuous size, different ratios could be realized by various the number of teeth of the sun gear and the number of teeth of the planetary gears. Small the sun equipment, the higher the ratio. Technically, a meaningful ratio range for a planetary stage is definitely 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 obtained by connecting several 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 can be overlaid by having a band 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 pick up the torque via the ring equipment. Planetary gearboxes have become extremely important in many areas of mechanical engineering.
They have grown to be particularly more developed in areas where high output levels and fast speeds should be transmitted with favorable mass inertia ratio adaptation. High tranny ratios may also easily be performed with planetary gearboxes. Because of the positive properties and small 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 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 portion of the gearbox
Chance for use as overriding gearbox
Favorable volume output
Suitability for an array of applications
Epicyclic gearbox can be an automatic type gearbox in which 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 train is replaced with hydro coupled clutch or torque convertor which in turn made the transmission automatic.
The thought of epicyclic gear box is extracted 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 based on the require 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 occurs in analogy to the orbiting of the planets in the solar program. This is how planetary gears obtained their name.
The components of a planetary gear train can be split into four main constituents.
The housing with integrated internal teeth is actually a ring gear. In the majority of cases the casing is fixed. The driving sun pinion can be in the center of the ring gear, and is coaxially organized in relation to the output. Sunlight pinion is usually mounted on a clamping system to be able to offer the mechanical connection to the electric motor shaft. During procedure, the planetary gears, which are mounted on a planetary carrier, roll between your sun pinion and the band 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 transmission ratio of the gearbox. The number of planets may also vary. As the amount of planetary gears increases, the distribution of the load increases and therefore the torque which can be transmitted. Raising the amount of tooth engagements also decreases the rolling power. Since just section of the total result needs to be transmitted as rolling power, a planetary gear is incredibly efficient. The benefit of a planetary equipment compared to an individual spur gear is based on this load distribution. Hence, it is possible to transmit high torques wit
h high efficiency with a concise design using planetary gears.
Provided that the ring gear includes a continuous size, different ratios can be realized by various the amount of teeth of sunlight gear and the number of the teeth of the planetary gears. Small the sun equipment, 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 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 talk about multi-stage gearboxes.
With planetary gearboxes the speeds and torques could 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 grown to be 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 transmission ratios can also easily be achieved with planetary gearboxes. Because of their positive properties and small 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 due to mixture of several planet stages
Ideal as planetary switching gear because of fixing this or that section of the gearbox
Chance for use as overriding gearbox
Favorable volume output
In a planetary gearbox, many teeth are involved at once, that allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back to the electric motor. Having multiple teeth reveal the load also allows planetary gears to transmit high levels of torque. The mixture of compact size, large speed reduction 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 can make them a far more expensive solution than additional gearbox types. And precision production is extremely important for these gearboxes. If one planetary equipment is positioned closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the small footprint of planetary gears makes warmth dissipation more difficult, so applications that operate at very high speed or encounter continuous procedure may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers provide right-angle designs that integrate other gear sets (frequently bevel gears with helical the teeth) to provide an offset between your input and output.
Input power (max)27 kW (36 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)12,880 Nm(9,500 lb-ft)
Output torque (continuous)8,135 Nm (6,000 lb-ft)
1 Actual ratio is dependent 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 (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 motor 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 is determined by load distribution over multiple planet gears. It is thereby possible to transfer high torques utilizing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power 500/14 possess two selectable sunlight gears. The first equipment step of the stepped planet gears engages with sunlight gear #1. The second gear step engages with sunlight gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sun gear 1 with the band 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 gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate together at the same rate. The stepped planet gears usually do not unroll. Therefore the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sunlight gear 3 and band gear 3 are straight coupled.
Many “gears” are utilized for automobiles, but they are also used for many various other machines. The most frequent one may be the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one is definitely to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the various other is to change 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 not possible to rotate tires with the same rotation speed to run, it is necessary to lessen the rotation speed using 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 named the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to begin moving however they usually do not require such a huge force to keep moving 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 output by changing the reduction 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 one another can be considered as the ratio of the length of levers’ arms. That's, if the decrease ratio is large and the rotation quickness as output is low in comparison compared to that as insight, the energy output by transmitting (torque) will be large; if the rotation acceleration as output isn't so low in comparison to that as insight, however, the power output by tranny (torque) will be small. Thus, to improve the decrease ratio utilizing transmitting is much comparable to the basic principle of moving things.
Then, how does a tranny alter the reduction ratio ? The answer lies in the system called a planetary equipment mechanism.
A planetary gear system is a gear system comprising 4 components, namely, sunlight gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It includes a very complex framework rendering its design or production most challenging; it can understand the high decrease ratio through gears, however, it really is a mechanism suitable for a reduction system that requires both little size and high performance such as transmission for automobiles.
The planetary speed reducer & gearbox is a kind 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 huge torque. How really 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 situated in close contact with the inner gearbox case. Sunlight equipment driven by the external power lies in the center of the ring gear. Between your sun gear and band gear, there is a planetary gear set consisting of three gears equally built-up at the earth carrier, which can be floating among them counting on the support of the output shaft, ring gear and sun gear. When sunlight gear is certainly actuated by the insight power, the earth gears will be driven to rotate and revolve around the guts together with the orbit of the ring gear. The rotation of the earth gears drives the output shaft linked with the carrier to result the power.
Planetary speed reducer applications
Planetary speed reducers & gearboxes have a lot of advantages, like small size, light-weight, high load capability, long service life, high reliability, low noise, large output torque, wide selection of speed ratio, high efficiency and so on. Besides, the planetary rate reducers gearboxes in Ever-Power are designed for square flange, which are easy and practical for installation and ideal for AC/DC servo motors, stepper motors, hydraulic motors etc.
Because of these advantages, planetary gearboxes can be applied to the lifting transportation, engineering machinery, metallurgy, mining, petrochemicals, construction machinery, light and textile sector, medical equipment, instrument and gauge, vehicle, ships, weapons, aerospace and other commercial sectors.
The primary reason to use a gearhead is that it makes it possible to control a 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 have to be as much times better as the decrease ratio which can be used. Moog offers an array of windings in each frame size that, coupled with an array of reduction ratios, provides an range of solution to result requirements. Each combination of electric motor and gearhead offers unique advantages.
Precision Planetary Gearheads
gearheads
32 mm Low Cost Planetary Gearhead
32 mm Precision Planetary Gearhead
52 mm Precision Planetary Gearhead
62 mm Precision Planetary Gearhead
81 mm Precision Planetary Gearhead
120 mm Precision Planetary Gearhead
Planetary gearheads are ideal for transmitting high torques as high as 120 Nm. Generally, 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 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 stability 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, small size and competitive cost. The 16mm shaft diameter ensures balance in applications with belt tranny. Fast mounting for your equipment.
1. Planetary ring gear material: metal steel
2. Bearing at result type: Ball bearing
3. Max radial load (12mm distance from flange): 550N
4. Max shaft axial load: 500N
5. Backlash: 18 arcmin
6. Gear ratio from 3 to 216
7. Planetary gearbox length 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 request :
suitable with standard nema34 stepper motor shaft 14mm diameter*32 duration(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 methods are different. The input of the cost-effective retarder assembly is the keyway (ie the output shaft of the motor can be an assembleable keyway engine); the insight of the precision reducer assembly is definitely clamped and the insight electric motor shaft is a set or circular shaft or keyway. The shaft could be mounted (note: the keyway shaft can be removed following the key is removed).
Second, the economical and precision planetary gearboxes possess the same drawings and measurements. The main difference is: the material differs. Accurate gear products are superior to economical gear units when it comes to transmission efficiency and precision, as well as heat and sound and torque output stability.

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