Planetary Gear Transmission

An assembly of meshed gears comprising a central or sun equipment, a coaxial inner or ring gear, and one or more intermediate pinions supported on a revolving carrier. Occasionally the word planetary gear teach is utilized broadly as a synonym for epicyclic equipment train, or narrowly to indicate that the ring gear is the set member. In a simple planetary gear train the pinions mesh concurrently with both coaxial gears (discover illustration). With the central gear 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 in fact the output comes from another ring gear varying a few teeth from the primary.
With the initial model 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 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
Result 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 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 system. This is how planetary gears acquired their name.
The parts 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 the majority of cases the casing is fixed. The traveling sun pinion is certainly in the center 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 electric motor shaft. During procedure, the planetary gears, which are installed 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 mandatory torque. The amount of teeth does not have any effect on the transmission ratio of the gearbox. The amount of planets can also vary. As the number of planetary gears boosts, the distribution of the strain increases and therefore the torque which can be transmitted. Raising the number 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 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 compact style using planetary gears.
So long as the ring gear includes a constant size, different ratios can be realized by different the amount of teeth of the sun gear and the number of teeth of the planetary gears. The smaller the sun 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 the sun gear are extremely little above and below these ratios. Higher ratios can be acquired by connecting several 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 could be overlaid by having a ring gear that is not fixed but is driven in any direction of rotation. It is also possible to fix the drive shaft to be able to grab the torque via the band equipment. Planetary gearboxes have grown to be 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 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 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
Almost unlimited transmission ratio options because of combination of several planet stages
Ideal 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
In an epicyclic or planetary gear train, several spur gears distributed evenly around the circumference operate between a gear with internal teeth and a gear with external teeth on a concentric orbit. The circulation of the spur equipment occurs in analogy to the orbiting of the planets in the solar system. This is how planetary gears acquired their name.
The components 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 traveling sun pinion is definitely 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 in order to provide the mechanical link with the engine shaft. During operation, 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 output shaft of the gearbox.
The sole purpose of the planetary gears is to transfer the required torque. The number 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 increases, the distribution of the load increases and therefore the torque that can be transmitted. Increasing the amount of tooth engagements also reduces the rolling power. Since just area of the total output has to be transmitted as rolling power, a planetary equipment is extremely efficient. The advantage of a planetary gear compared to an individual spur gear lies in this load distribution. It is therefore possible to transmit high torques wit
h high efficiency with a compact style using planetary gears.
So long as the ring gear includes a continuous size, different ratios could be realized by different the amount of teeth of the sun 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 definitely 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 acquired by connecting many planetary stages in series in the same ring 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. Additionally it is possible to repair the drive shaft to be able to pick up the torque via the ring gear. Planetary gearboxes have grown to be extremely important in lots of regions 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 can also easily be performed with planetary gearboxes. Because of their positive properties and compact design, the gearboxes have many potential uses in commercial applications.
The benefits of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to 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 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 where parallel shafts and gears set up from manual equipment box are replaced with more compact and more reliable sun and planetary kind of gears arrangement and also the manual clutch from manual power train is definitely replaced with hydro coupled clutch or torque convertor which in turn produced the transmission automatic.
The idea of epicyclic gear box is taken from the solar system which is known as to an ideal 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 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 external 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 one way planetary gears acquired their name.
The components 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 traveling sun pinion is in the center of the ring gear, and is coaxially arranged with regards to the output. Sunlight pinion is usually mounted on a clamping system to be able to offer the mechanical link with the engine shaft. During procedure, 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 result shaft of the gearbox.
The sole reason for the planetary gears is to transfer the required torque. The amount of teeth has no effect on the transmission ratio of the gearbox. The amount of planets may also vary. As the number of planetary gears boosts, the distribution of the strain increases and therefore the torque that can be transmitted. Raising the amount of tooth engagements also decreases the rolling power. Since only portion of the total output has to be transmitted as rolling power, a planetary equipment is incredibly efficient. The benefit of a planetary equipment compared to an individual spur gear lies in this load distribution. Hence, it is feasible 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 varying the number of teeth of the sun gear and the amount of teeth of the planetary gears. The smaller the sun gear, 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 the sun gear are extremely small above and below these ratios. Higher ratios can be acquired by connecting a number of planetary phases 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 virtually any direction of rotation. Additionally it is possible to repair the drive shaft to be able to grab the torque via the band gear. 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 can also easily be achieved with planetary gearboxes. Because of their positive properties and compact design, the gearboxes have many potential uses in industrial applications.
The advantages of planetary gearboxes:
Coaxial arrangement of input shaft and output shaft
Load distribution to many planetary gears
High efficiency due to low rolling power
Nearly unlimited transmission ratio options because of combination of several planet stages
Appropriate as planetary switching gear because of fixing this or that part of the gearbox
Chance for use as overriding gearbox
Favorable volume output
In a planetary gearbox, many teeth are engaged at once, that allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back to the motor. Having multiple teeth discuss the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, large speed decrease and high torque tranny makes planetary gearboxes a favorite 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 other gearbox types. And precision production is really important for these gearboxes. If one planetary gear is positioned closer to sunlight gear compared to the others, imbalances in the planetary gears may appear, leading to premature wear and failure. Also, the compact footprint of planetary gears makes heat dissipation more difficult, so applications that run at very high speed or experience continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with each other, although manufacturers offer right-angle designs that include other gear sets (often bevel gears with helical the teeth) to supply an offset between the input and output.
Input power (max)27 kW (36 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)12,880 Nm(9,500 lb-ft)
Output torque (continuous)8,135 Nm (6,000 lb-ft)
1 Actual ratio is dependent on the drive configuration.
2 Max input speed linked 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 (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 equipment and several world 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 benefit of a planetary transmission depends upon load distribution over multiple planet gears. It 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 gear stage of the stepped world gears engages with sunlight gear #1. The next equipment step engages with sun gear #2. With sun gear 1 or 2 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 equipment assy (1) or (2), sunlight gear 1 is in conjunction with the ring gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate collectively at the same acceleration. The stepped world gears usually do not unroll. Therefore the gear ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sun gear 3 and band gear 3 are directly coupled.
Many “gears” are used for automobiles, but they are also utilized for many additional machines. The most typical one may be the “tranny” 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 quickness emitted by the engine to transmit to tires; the additional is to change the reduction ratio relative to the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the overall state of traveling amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is difficult to rotate tires with the same rotation acceleration to run, it is required to lower the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation rate of engine and that of wheels is named the reduction ratio.
Then, why is it necessary to modify the reduction ratio in accordance with the acceleration / deceleration or driving speed ? This is because substances need a large force to start moving however they do not require this kind of a large force to keep moving once they have started to move. Automobile could be cited as a good example. An engine, Planetary Gear Transmission nevertheless, by its nature can’t so finely modify its output. Therefore, one adjusts its output by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of the teeth of gears meshing with one another can be considered as the ratio of the space of levers’ arms. That’s, if the decrease ratio is large and the rotation rate 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 is not so low in comparison compared to that as insight, on the other hand, the energy output by transmitting (torque) will be small. Thus, to change the decrease ratio utilizing transmitting is much comparable to the theory of moving things.
After that, how does a tranny modify the reduction ratio ? The answer is based on the system called a planetary equipment mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sunlight 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 framework rendering its design or production most difficult; it can realize the high reduction ratio through gears, nevertheless, it is a mechanism suited to a reduction mechanism that requires both small size and powerful such as for example transmission for automobiles.
The planetary speed reducer & gearbox is a kind of transmission mechanism. It utilizes the velocity transducer of the gearbox to lessen the turnover quantity of the engine to the mandatory one and obtain a big torque. How 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 band gear. The ring equipment is situated in close get in touch with with the inner gearbox case. The sun gear driven by the external power lies in the center of the ring equipment. Between your sun gear and band gear, there is a planetary gear set consisting of three gears equally built-up at the planet carrier, which is floating among them relying on the support of the output shaft, ring equipment and sun gear. When sunlight equipment is usually actuated by the input power, the earth gears will be driven to rotate and revolve around the center 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, huge output torque, wide variety of speed ratio, high efficiency and so forth. Besides, the planetary speed reducers gearboxes in Ever-Power are created for square flange, which are easy and easy for installation and ideal for AC/DC servo motors, stepper motors, hydraulic motors etc.
Because of these advantages, planetary gearboxes are applicable to the lifting transportation, engineering machinery, metallurgy, mining, petrochemicals, building machinery, light and textile industry, medical equipment, instrument and gauge, vehicle, ships, weapons, aerospace and other commercial sectors.
The primary reason to employ a gearhead is that it makes it possible to control a large 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 thus current, would have to be as many times higher as the reduction ratio which is used. Moog offers a selection of windings in each frame size that, combined with a selection of reduction ratios, provides an assortment of solution to result requirements. Each mixture of engine 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 of up to 120 Nm. As a rule, the larger gearheads include 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 within 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, small size and competitive cost. The 16mm shaft diameter ensures balance in applications with belt transmission. 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 tranny. Fast installation 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 Motor 50N.m (6944oz-in) Rated Torque
This gear ratio is 5:1, if need other gear ratio, please contact us.
Input motor shaft ask for :
suitable with regular nema34 stepper electric motor shaft 14mm diameter*32 length(Including pad height). (plane and Round shaft and crucial shaft both available)
The difference between your economical and precision Nema34 planetary reducer:
To begin with: the financial and precise installation methods are different. The input of the economical retarder assembly may be the keyway (ie the result shaft of the engine can be an assembleable keyway engine); the input of the precision reducer assembly is usually clamped and the input electric motor shaft is a flat 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 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, and also heat and sound and torque output balance.