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 gear and several world gears which rotate between these.
This assembly concept explains the term 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 really is thereby feasible 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 sunlight gears. The first gear stage of the stepped planet gears engages with sun gear #1. The second gear step engages with sun 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 gear 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 output shafts, configure a single-stage planetary using one of six different reductions, or build a multi-stage gearbox using some of the various ratio combinations.
All the Ever-Power gearboxes include installation 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 ideal piloting and high effectiveness.
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 rear of the gearbox. This makes it easy to change equipment ratios, encoders, motors, etc. without have to take apart your entire system. Another feature of the Ever-Power that means it is easy to use is the removable shaft coupler program. This system enables you to change motors without the need to buy a particular pinion and press it on. Furthermore, the Ever-Power uses the same pilot and bolt circle as the CIM, enabling you to run a Ever-Power anywhere a CIM electric motor mounts.
The Ever-Power has a variety of options for installation. Each gearbox offers four 10-32 threaded holes at the top and bottom level of its casing for easy side mounting. In addition, additionally, there are holes on leading which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is the same as the CIM engine – anywhere you can install a CIM-style engine, you can mount a Ever-Power.
Other features include:
Six different planetary gear stages can be used to make up to 72 unique gear ratios, the most of any COTS gearbox in FRC or FTC.
Adapts to a variety 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 planet and sun gears made from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Make sure you grease before assembly.
received an award of distinction in the ferrous category for a planetary gear assembly system used in a four wheel drive computer controlled shifting system. The output shaft links the actuator electric motor to the vehicle transmitting and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end facilitates a planetary gear program that supplies torque to operate the control system. The shaft output operates with 16 P/M world gears and 3 P/M equipment carrier plates. The shaft is manufactured out of a proprietary high effect copper steel to a density of 7.7 grams/cc. It has an unnotched Charpy effect strength above 136J (110 ft-lbs), elongation greater 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 stick. The driver selects the gear, and can generally move from any forwards gear into another without having to visit the next gear in the sequence. The exception to the would be some types of cars, which allow the driver to choose only the next lower or next higher gear – this is what’s known as a sequential manual transmission
In any manual transmission, there exists a flywheel attached to the crankshaft, and it spins combined with the crankshaft. Between your flywheel and the pressure plate is definitely a clutch disk. The function of the pressure plate can be to hold the clutch disk against the flywheel. When the clutch pedal is usually up, the flywheel causes the clutch plate to spin. When the clutch pedal is definitely down, the pressure plate no more works on the disc, and the clutch plate stops getting power from the engine. This is what allows you to change gears without harming your vehicle transmission. A manual transmission is characterized by selectable equipment ratios – this implies that selected equipment pairs can be locked to the output shaft that’s inside the transmission. That’s what we imply when we use the term “main gears.” An automatic transmission, however, uses planetary gears, which work quite differently.
Planetary gears and the automatic transmission
The basis of your automatic transmission is what is known as a planetary, or epicycloidal, gear set. This is exactly what allows you to change your vehicle gear ratio without needing to engage or disengage a clutch.
A planetary gear arranged has three parts. The guts gear is the sun. The smaller gears that rotate around the sun are referred to as the planets. And finally, the annulus is the ring that engages with the planets on the outer side. In the event that you were wanting to know how planetary gears got the name, now you know!
In the gearbox, the 1st gear set’s world carrier is linked to the ring of the second gear set. Both sets are connected by an axle which delivers power to the wheels. If one area of the planetary gear is locked, others continue steadily to rotate. This implies that gear adjustments are easy and even.
The typical automatic gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, cars acquired an overdrive gearbox furthermore to the main gearbox, to lessen the engine RPM and “stretch” the high gear with the thought of achieving fuel economy during highway traveling. This overdrive used an individual planetary. The problem was that this actually increased RPM rather than reducing it. Today, automated transmissions possess 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 vehicles now actually squeeze away five gears using three planetaries. This type of 5-velocity or 6-acceleration 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 vehicle transmission works, right now there are countless online language resources which will deliver information that’s simply as complicated as you want to buy to be.
The planetary gear program is a crucial component in speed reduced amount of gear system. It consists of a ring gear, group of planetary gears, a sun gear and a carrier. It really is mainly used in high speed decrease transmission. More velocity variation can be achieved using this technique with same amount of gears. This acceleration reduction is founded on the number of the teeth in each gear. How big is new system is compact. A theoretical calculation is conducted at concept level to obtain the desired reduction of speed. Then the planetary gear system can be simulated using ANSYS software for new development transmission system. The final validation is performed with the tests of physical parts. This concept is implemented in 9speed transmission system. Similar concept is in advancement for the hub reduction with planetary gears. The maximum 3.67 reduction is achieved with planetary system. The stresses in each pin can be calculated using FEA.
Planetary gears are trusted in the industry because of their benefits of compactness, high power-to-weight ratios, high efficiency, and so forth. Nevertheless, planetary gears such as for example that in wind mill transmissions usually operate under dynamic circumstances 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 you of these failure modes, equipment tooth crack at the tooth root due to tooth bending fatigue or excessive load can be investigated; how it influences the powerful features of planetary equipment program is studied. The applied tooth root crack model can simulate the propagation process of the crack along tooth width and crack depth. With this process, the mesh stiffness of equipment pairs in mesh can be obtained and incorporated into a planetary equipment dynamic model to investigate the effects of the tooth root crack on the planetary equipment powerful responses. Tooth root cracks on sunlight gear and on earth 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 in time and frequency domains, respectively. Moreover, the differences in the dynamic top features of the planetary equipment between the instances that tooth root crack on the sun gear and on the planet gear are found.
Advantages of using planetary equipment motors in your projects
There are several types of geared motors that can be used in search for the perfect movement within an engineering project. Considering the technical specifications, the required performance or space limitations of our design, you should ask yourself to make use of one or the additional. In this article we will delve on the planetary gear motors or epicyclical gear, so you will know thoroughly what its advantages are and find out some successful applications.
The planetary gear systems are characterized by having gears whose disposition is quite not the same as other models like the uncrowned end, cyclical (step by step) or spur and helical gears. How could we classify their elements?
Sun: The central gear. 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 sunlight gear.
Crown or band: an outer ring (with teeth on its inner side) meshes with the satellites possesses the whole epicyclical train. In addition, the core can also become a center of rotation for the outer ring, allowing it to easily change directions.
For accuracy and reliability, many automated transmissions currently use planetary equipment motors. If we talk about sectors this reducer offers great versatility and can be utilized in very different applications. Its cylindrical form is easily adaptable to thousands of spaces, ensuring a huge reduction in a very contained space.
Regularly this type of drives can be used in applications that require higher levels of precision. For instance: Industrial automation machines, vending devices or robotics.
What are the primary benefits of planetary gear motors?
Increased repeatability: Its better speed radial and axial load offers reliability and robustness, minimizing the misalignment of the gear. 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 because 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 boost this feature, your bearings lessen the losses that could happen by rubbing the shaft on the box directly. Thus, greater efficiency of the gear and a much smoother operation is achieved.
Very good levels of efficiency: Planetary reducers offer greater efficiency and thanks to its design and internal layout losses are minimized throughout their work. In fact, today, this type of drive mechanisms are those that offer greater efficiency.
Increased torque transmission: With more teeth in contact, the mechanism can transmit and withstand more torque. Furthermore, it can it in a more uniform manner.
Maximum versatility: Its mechanism is within a cylindrical gearbox, which can be installed in almost any space.
Planetary gear system is a kind of epicyclic gear system used in precise and high-efficiency transmissions. We have vast experience in production planetary gearbox and equipment components such as sun gear, world carrier, and ring equipment in China.
We employ the innovative equipment and technology in manufacturing our gear models. Our inspection processes comprise examination of the torque and materials for plastic, sintered metallic, and steel planetary gears. You can expect various assembly styles for your gear decrease projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment selected in equipment assy (1) or (2), the sun gear 1 is coupled with the ring gear in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and band gear then rotate together at the same acceleration. The stepped planet gears usually do not unroll. Thus the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sun gear 3 and ring gear 3 are directly coupled.
Sun gear #1 fixed
Example Gear Assembly #1
The input from equipment assy (1) is transferred via the ring equipment. When the sun equipment 1 is definitely coupled to the axle, the initial gear step of the stepped planet gears rolls off between the fixed sun gear 1, and the rotating band gear. One rotation of the ring gear (green arrow) outcomes in 0.682 rotations of the earth carrier (red arrow).
Example Gear Assembly #2
In this instance 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 hereby reversed from equipment assy #1. The earth carrier (reddish colored arrow) rotates 0.682 of a complete rotation leading to one full rotation of the band equipment (green arrow) when sunlight equipment #1 is coupled to the axle.
Sun gear #2 fixed
Example Gear Assembly #1
The input from equipment assy #1 is transferred via the ring equipment. When the sun gear #2 is coupled to the axle, the stepped planetary gears are pressured to rotate around the fixed sun gear on their second gear stage. The first gear step rolls in to the ring gear. One full rotation of the band gear (green arrow) outcomes in 0.774 rotations of the earth carrier (red arrow). Sunlight equipment #1 is carried forwards without function, as it can be driven on by the first gear step 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 definitely transferred via the ring gear. The rotational romantic relationship is hereby reversed, as opposed to gear assy #1. The planet carrier (green arrow) rotates 0.774 of a complete rotation, leading to one full rotation of the ring gear (red arrow), when sun gear #2 is coupled to the axle.