planetary gear system

PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system since it can be known), consists normally of a centrally pivoted sun gear, a ring equipment and several planet gears which rotate between these.
This assembly concept explains the word planetary transmission, as the planet gears rotate around sunlight 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 is thereby possible to transfer high torques utilizing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power SPEEDHUB 500/14 have two selectable sunlight gears. The first gear step of the stepped planet gears engages with sunlight gear #1. The second equipment step engages with sun gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sun equipment 1 with the band gear, three ratio variants are achievable with each gear assembly.
The Ever-Power is a battle-tested modular planetary gearbox system designed specifically for use in the Robotics market. Designers choose one of four output shafts, configure a single-stage planetary using among six different reductions, or build a multi-stage gearbox using any of the different ratio combinations.
All the Ever-Power gearboxes include installation plates & hardware for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG motor) — these plates are custom made for each motor to provide perfect piloting and high effectiveness.
What great is a versatile system if it’s not easy to take apart and re-configure? That’s why we released the Ever-Power V2 with assembly screws in the back of the gearbox. This makes it easy to change gear ratios, encoders, motors, etc. without have to take apart your complete mechanism. Another feature of the Ever-Power that makes it easy to use may be the removable shaft coupler program. This system allows you to modify motors with no need to buy a special pinion and press it on. Furthermore, the Ever-Power uses the same pilot and bolt circle as the CIM, allowing you to operate a Ever-Power anywhere a CIM motor mounts.
The Ever-Power has a variety of options for mounting. Each gearbox has four 10-32 threaded holes on top and bottom of its casing for easy part mounting. In addition, additionally, there are holes on leading which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is actually the same as the CIM motor – anywhere you can install a CIM-style electric motor, you can install a Ever-Power.
Other features include:
Six different planetary gear stages can be utilized to generate up to 72 unique equipment ratios, the most of any kind of COTS gearbox in FRC or FTC.
Adapts to a number of FRC motors (BAG, Mini CIM, RS-550, RS-775, 775pro, Redline, AM-9015, and CIM)
Adapts to a number of FTC motors (AndyMark NeveRest, REV HD Hex Engine, Tetrix TorqueNADO)
ABEC-1/ISO 492 Class Normal Bearings, rated for 20,000+ RPM
AGMA-11 quality planet and sun gears made from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Please grease before assembly.
won an award of distinction in the ferrous category for a planetary gear assembly system found in a four wheel drive computer controlled shifting system. The output shaft links the actuator engine to the vehicle tranny and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end supports a planetary gear program that products torque to use the control system. The shaft result operates with 16 P/M world gears and 3 P/M gear carrier plates. The shaft is manufactured out of a proprietary high influence copper steel to a density of 7.7 grams/cc. It has an unnotched Charpy impact strength above 136J (110 ft-lbs), elongation higher than 8% and a tensile power of 65 MPa (95,000 psi).
Manual transmission
A manual transmitting is operated by means of a clutch and a moveable stick. The driver selects the gear, and can usually move from any forward gear into another without needing to visit the next gear in the sequence. The exception to this will be some types of cars, which allow the driver to select only another lower or next higher gear – this is what’s known as a sequential manual transmission
In any manual transmission, there exists a flywheel mounted on the crankshaft, and it spins along with the crankshaft. Between the flywheel and the pressure plate is usually a clutch disk. The function of the pressure plate is usually to carry the clutch disk against the flywheel. When the clutch pedal is up, the flywheel causes the clutch plate to spin. When the clutch pedal is definitely down, the pressure plate no more acts on the disc, and the clutch plate stops getting power from the engine. This is exactly what allows you to change gears without harming your vehicle transmission. A manual transmitting is seen as a selectable equipment ratios – this implies that selected gear pairs could be locked to the output shaft that’s within the tranny. That’s what we suggest when we utilize the term “primary gears.” An automated transmission, on the other hand, uses planetary gears, which work quite differently.
Planetary gears and the automatic transmission
The foundation of your automated transmission is what’s known as a planetary, or epicycloidal, gear set. This is exactly what enables you to change your vehicle gear ratio without having to engage or disengage a clutch.
A planetary gear arranged has 3 parts. The guts gear is the sun. Small gears that rotate around the sun are known as the planets. And lastly, the annulus is the band that engages with the planets on the outer side. In the event that you were wondering how planetary gears got the name, now you understand!
In the gearbox, the initial gear set’s world carrier is connected to the band of the second gear set. Both sets are connected by an axle which delivers power to the wheels. If one section of the planetary equipment is locked, others continue to rotate. This means that gear changes are easy and simple.
The typical automated gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, cars acquired an overdrive gearbox in addition to the main gearbox, to reduce the engine RPM and “stretch” the high gear with the thought of achieving fuel economy during highway driving. This overdrive used a single planetary. The problem was that actually increased RPM instead of reducing it. Today, automated transmissions have absorbed the overdrive, and the configuration is currently three planetaries – two for regular procedure and one to act as overdrive, yielding four forward gears.
The future
Some automobiles now actually squeeze out five gears using three planetaries. This kind of 5-acceleration or 6-velocity gearbox is now increasingly common.
This is in no way a comprehensive discussion of primary gears and planetary gears. If you would like to learn more about how your car transmission works, generally there are countless online resources that may deliver information that’s simply as complex as you want it to be.
The planetary gear program is a critical component in speed reduction of gear system. It includes a ring gear, group of planetary gears, a sun equipment and a carrier. It is mainly utilized in high speed reduction transmission. More quickness variation can be achieved using this system with same number of gears. This rate reduction is based on the number of tooth in each gear. How big is new system is compact. A theoretical calculation is performed at concept level to find the desired reduction of speed. Then your planetary gear system is definitely simulated using ANSYS software for new development transmission system. The ultimate validation is performed with the tests of physical parts. This concept is implemented in 9speed transmission system. Similar concept is in development for the hub reduction with planetary gears. The maximum 3.67 decrease is achieved with planetary system. The stresses in each pin is calculated using FEA.
Planetary gears are widely used in the industry because of their benefits of compactness, high power-to-weight ratios, high efficiency, and so on. However, planetary gears such as that in wind mill transmissions constantly operate under dynamic conditions with internal and exterior load fluctuations, which accelerate the occurrence of equipment failures, such as tooth crack, pitting, spalling, wear, scoring, scuffing, etc. As one of these failure modes, gear tooth crack at the tooth root due to tooth bending exhaustion or excessive load is investigated; how it influences the dynamic top features of planetary equipment system is studied. The used tooth root crack model can simulate the propagation procedure for the crack along tooth width and crack depth. With this approach, the mesh stiffness of equipment pairs in mesh is usually obtained and incorporated right into a planetary gear dynamic model to investigate the effects of the tooth root crack on the planetary gear dynamic responses. Tooth root cracks on the sun gear and on the planet gear are believed, respectively, with different crack sizes and inclination angles. Finally, analysis regarding the impact of tooth root crack on the powerful responses of the planetary equipment system is performed with time and frequency domains, respectively. Moreover, the differences in the dynamic features of the planetary equipment between the situations that tooth root crack on sunlight gear and on the planet gear are found.
Benefits of using planetary equipment motors in work
There are several types of geared motors that can be utilized in search for an ideal movement in an engineering project. Considering the technical specs, the required performance or space limitations of our design, you should ask yourself to use one or the other. In this article we will delve on the planetary equipment motors or epicyclical gear, so you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear devices are characterized by having gears whose disposition is quite different from other models like the uncrowned end, cyclical (step-by-step) or spur and helical gears. How could we classify their elements?
Sun: The central equipment. It has a larger size and rotates on the central axis.
The earth carrier: Its objective is to carry up to 3 gears of the same size, which mesh with the sun gear.
Crown or band: an outer band (with teeth on its inner part) meshes with the satellites and contains the complete epicyclical train. Furthermore, the core may also become a center of rotation for the outer ring, allowing it to easily change directions.
For accuracy and reliability, many automatic transmissions currently use planetary gear motors. If we talk about sectors this reducer provides great versatility and can be utilized in very different applications. Its cylindrical shape is quickly adaptable to thousands of spaces, ensuring a big reduction in an extremely contained space.
Regularly this type of drives can be used in applications that require higher levels of precision. For instance: Industrial automation devices, vending machines or robotics.
What are the main advantages of planetary gear motors?
Increased repeatability: Its greater speed radial and axial load offers reliability and robustness, minimizing the misalignment of the apparatus. In addition, uniform transmission and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability enhances the accuracy and reliability of the movement.
Lower noise level since there is more surface area contact. Rolling is a lot softer and jumps are practically nonexistent.
Greater durability: Because of its torsional rigidity and better rolling. To boost this feature, your bearings lessen the losses that would happen by rubbing the shaft on the box directly. Thus, greater effectiveness of the gear and a much smoother procedure is achieved.
Very good degrees of efficiency: Planetary reducers provide greater efficiency and because of its design and internal layout losses are minimized during their work. In fact, today, this type of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With an increase of teeth in contact, the mechanism can transmit and endure more torque. Furthermore, it does it in a far more uniform manner.
Maximum versatility: The mechanism is within a cylindrical gearbox, which can be installed in nearly every space.
Planetary gear system is a type of epicyclic gear program used in precise and high-performance transmissions. We have vast experience in production planetary gearbox and gear components such as for example sun gear, world carrier, and ring equipment in China.
We employ the most advanced apparatus and technology in manufacturing our gear pieces. Our inspection processes comprise examination of the torque and materials for plastic, sintered metal, and metal planetary gears. You can expect various assembly designs for your gear reduction projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct gear selected in equipment assy (1) or (2), sunlight gear 1 is coupled with the ring gear in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and ring gear then rotate with each other at the same rate. The stepped planet gears usually do not unroll. Thus 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 straight coupled.
Sun gear #1 fixed
Example Gear Assembly #1
The input from equipment assy (1) is transferred via the ring gear. When the sun equipment 1 can be coupled to the axle, the initial gear step of the stepped planet gears rolls off between your fixed sun gear 1, and the rotating ring equipment. One rotation of the band gear (green arrow) results in 0.682 rotations of the earth carrier (red arrow).
Example Gear Assembly #2
In cases like this of gear assy #2 the input is transferred via the planet carrier and the output is transferred via the band gear. The rotational romantic relationship is usually hereby reversed from gear assy #1. The earth carrier (red arrow) rotates 0.682 of a complete rotation leading to one full rotation of the band gear (green arrow) when sun equipment #1 is coupled to the axle.
Sun gear #2 fixed
Example Gear Assembly #1
The input from gear assy #1 is transferred via the ring gear. When the sun gear #2 is definitely coupled to the axle, the stepped planetary gears are pressured to rotate around the fixed sun gear on the second gear step. The first equipment step rolls into the ring equipment. One full rotation of the ring gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sun equipment #1 is carried forwards without function, as it is usually driven on by the 1st gear stage of the rotating planetary gears.
Example Gear Assembly #2
With gear assy #2 the input drive is transferred via the planet carrier. The output is certainly transferred via the ring gear. The rotational romantic relationship is hereby reversed, as opposed to gear assy #1. The earth carrier (green arrow) rotates 0.774 of a complete rotation, leading to one full rotation of the band gear (red arrow), when sun gear #2 is coupled to the axle.