planetary gear system

PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system as 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 earth gears rotate around the sun gear as in the astronomical sense the planets rotate around our sun.
The advantage 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 SPEEDHUB 500/14 have two selectable sun gears. The first equipment step of the stepped planet gears engages with sunlight gear #1. The next equipment step engages with sunlight gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sunlight gear 1 with the band gear, three ratio variations are achievable with each equipment assembly.
The Ever-Power is a battle-tested modular planetary gearbox system designed specifically for use in the Robotics marketplace. Designers choose one of four result shafts, configure a single-stage planetary using among six different reductions, or create a multi-stage gearbox using some of the various ratio combinations.
All of the Ever-Power gearboxes include mounting plates & equipment for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG electric motor) — these plates are customized made for each motor to provide perfect piloting and high performance.
What great is a versatile system if it’s not simple to disassemble 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 need to take apart your complete system. Another feature of the Ever-Power that means it is easy to use may be the removable shaft coupler system. This system allows you to modify motors with no need to buy a special pinion and press it on. In addition, the Ever-Power uses the same pilot and bolt circle as the CIM, enabling you to operate a Ever-Power anywhere a CIM engine mounts.
The Ever-Power has a selection of options for mounting. Each gearbox has four 10-32 threaded holes on top and bottom level of its housing for easy aspect mounting. In addition, additionally, there are holes on the front which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is actually the identical to the CIM engine – anywhere you can attach a CIM-style engine, you can install a Ever-Power.
Other features include:
Six different planetary gear stages can be used to develop up to 72 unique gear ratios, the the majority of any COTS gearbox in FRC or FTC.
Adapts to a number of FRC motors (Handbag, 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 world and sun gears created from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Make sure you grease before assembly.
won an award of distinction in the ferrous category for a planetary gear assembly system used in a four wheel drive computer managed shifting system. The result shaft links the actuator motor to the vehicle transmission 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 materials torque to use the control system. The shaft output 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 metal to a density of 7.7 grams/cc. It comes with an unnotched Charpy influence strength above 136J (110 ft-lbs), elongation higher than 8% and a tensile strength of 65 MPa (95,000 psi).
Manual transmission
A manual tranny is operated by means of a clutch and a moveable stay. The driver selects the gear, and can generally move from any forwards equipment into another without needing to go to the next equipment in the sequence. The exception to this would be some types of cars, which permit the driver to select only another lower or following higher gear – this is what’s known as a sequential manual transmission
In virtually any manual transmission, there exists a flywheel mounted on the crankshaft, and it spins combined with the crankshaft. Between your flywheel and the pressure plate is usually a clutch disk. The function of the pressure plate is definitely to carry the clutch disk against the flywheel. When the clutch pedal is definitely up, the flywheel causes the clutch plate to spin. When the clutch pedal is certainly down, the pressure plate no more functions 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 transmission is characterized by selectable gear ratios – this implies that selected gear pairs can be locked to the output shaft that’s within the transmitting. That’s what we indicate when we use the term “main gears.” An automated transmission, however, uses planetary gears, which function quite differently.
Planetary gears and the automatic transmission
The foundation of your automated transmission is what is referred to as a planetary, or epicycloidal, gear set. This is exactly what allows you to change your vehicle gear ratio without having to engage or disengage a clutch.
A planetary gear set has three parts. The center gear may be the sun. Small gears that rotate around sunlight are referred to as the planets. And lastly, the annulus may be the ring that engages with the planets on the outer side. If 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 ring of the second gear set. The two sets are connected by an axle which delivers power to the wheels. If one area of the planetary equipment is locked, the others continue steadily to rotate. This implies 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, vehicles had an overdrive gearbox furthermore to the primary gearbox, to reduce the engine RPM and “stretch” the high equipment with the idea of achieving fuel economy during highway traveling. This overdrive used a single planetary. The issue was that this actually increased RPM instead of reducing it. Today, automated transmissions have absorbed the overdrive, and the configuration is currently three planetaries – two for normal operation and one to become overdrive, yielding four ahead gears.
The future
Some automobiles now actually squeeze out five gears using three planetaries. This type of 5-acceleration or 6-acceleration gearbox is becoming increasingly common.
This is in no way a thorough discussion of primary gears and planetary gears. If you would like to learn more about how your car transmission works, presently 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 decrease transmission. More rate variation can be achieved using this technique with same number of gears. This rate reduction is founded on the number of tooth in each gear. The size of new system is small. A theoretical calculation is performed at concept level to find the desired reduced amount of speed. Then your planetary gear program is certainly simulated using ANSYS software for new development transmitting system. The final validation is performed with the screening of physical parts. This idea is implemented in 9speed transmission system. Similar concept is in advancement for the hub reduction with planetary gears. The utmost 3.67 decrease is achieved with planetary program. The stresses in each pin is certainly calculated using FEA.
Planetary gears are trusted in the industry due to their advantages of compactness, high power-to-weight ratios, high efficiency, and so forth. Nevertheless, planetary gears such as for example 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 for example tooth crack, pitting, spalling, use, scoring, scuffing, etc. As one of these failure modes, gear tooth crack at the tooth root because of tooth bending exhaustion or excessive load is definitely investigated; how it influences the powerful top features of planetary gear 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 gear pairs in mesh can be obtained and incorporated right into a planetary equipment dynamic model to investigate the consequences of the tooth root crack on the planetary gear dynamic responses. Tooth root cracks on the sun gear and on earth gear are considered, respectively, with different crack sizes and inclination angles. Finally, analysis about the impact of tooth root crack on the dynamic responses of the planetary equipment system is performed with time and frequency domains, respectively. Moreover, the variations in the dynamic top features of the planetary gear between the instances that tooth root crack on sunlight gear and on the planet gear are found.
Advantages of using planetary equipment motors in your projects
There are various types of geared motors that can be used in search for an ideal movement within an engineering project. Considering the technical specs, the required performance or space restrictions of our style, you should ask yourself to make use of one or the other. In this article we will delve on the planetary gear motors or epicyclical gear, and that means you will know completely what its advantages are and discover some successful applications.
The planetary gear units 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 planet 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 upon its inner aspect) meshes with the satellites possesses the complete epicyclical train. In addition, the core may also become a center of rotation for the external ring, allowing it to easily change directions.
For accuracy and reliability, many automated transmissions currently use planetary equipment motors. If we discuss sectors this reducer provides great versatility and can be used in completely different applications. Its cylindrical shape is easily adaptable to thousands of areas, ensuring a large reduction in an extremely contained space.
Regularly this kind of drives can be used in applications that require higher degrees of precision. For instance: Industrial automation devices, vending machines or robotics.
What are the primary advantages of planetary gear motors?
Increased repeatability: Its higher speed radial and axial load offers reliability and robustness, minimizing the misalignment of the apparatus. In addition, uniform tranny and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability boosts 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 virtually nonexistent.
Greater durability: Due to its torsional rigidity and better rolling. To improve this feature, your bearings lessen the losses that would happen by rubbing the shaft on the package directly. Thus, greater effectiveness of the apparatus and a much smoother procedure is achieved.
Very good levels of efficiency: Planetary reducers offer greater efficiency and because of its design and internal layout losses are minimized throughout their work. Actually, today, this type of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With more teeth connected, the mechanism can transmit and withstand more torque. Furthermore, it does it in a more uniform manner.
Maximum versatility: Its mechanism is contained in a cylindrical gearbox, which may be installed in nearly every space.
Planetary gear program is a kind of epicyclic gear program found in precise and high-efficiency transmissions. We have vast experience in manufacturing planetary gearbox and gear components such as for example sun gear, world carrier, and ring equipment in China.
We employ the most advanced equipment and technology in manufacturing our gear units. Our inspection processes comprise examination of the torque and materials for plastic, sintered metallic, and metal planetary gears. We offer various assembly styles for your gear decrease 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 equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate jointly at the same rate. The stepped world gears do not unroll. Thus the gear ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sunlight gear 3 and ring 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 is coupled to the axle, the first gear stage of the stepped planet gears rolls off between your fixed sun gear 1, and the rotating ring gear. One rotation of the band gear (green arrow) outcomes in 0.682 rotations of the planet carrier (red arrow).
Example Gear Assembly #2
In this instance of gear assy #2 the input is transferred via the earth carrier and the output is transferred via the band gear. The rotational romantic relationship is usually hereby reversed from gear assy #1. The planet carrier (reddish 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 in to the ring gear. One full rotation of the band gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sunlight equipment #1 is carried forward without function, since it is driven on by the first gear stage of the rotating planetary gears.
Example Gear Assembly #2
With gear assy #2 the input drive is transferred via the earth carrier. The output is certainly transferred via the band gear. The rotational romantic relationship is definitely hereby reversed, instead of gear assy #1. The planet carrier (green arrow) rotates 0.774 of a complete rotation, leading to one full rotation of the ring equipment (red arrow), when sun gear #2 is coupled to the axle.