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 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 gear assembly 2 of the Ever-Power SPEEDHUB 500/14 have two selectable sun gears. The first gear step of the stepped planet gears engages with sunlight gear #1. The next gear step engages with sun gear #2. With sun gear one or two 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 marketplace. Designers choose among four result shafts, configure a single-stage planetary using one of six different reductions, or build a multi-stage gearbox using any of the different ratio combinations.
All of 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 customized designed for each motor to provide perfect piloting and high efficiency.
What good is a versatile system if it’s not easy to disassemble and re-configure? That’s why we released the Ever-Power V2 with assembly screws in the back of the gearbox. This helps it be easy to change equipment ratios, encoders, motors, etc. without have to take apart your entire mechanism. Another feature of the Ever-Power that makes it easy to use is the removable shaft coupler system. 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 operate a Ever-Power anywhere a CIM electric motor mounts.
The Ever-Power has a selection of options for mounting. Each gearbox provides four 10-32 threaded holes on top and bottom of its housing for easy side mounting. In addition, there are also holes on the front which allow face-mounting. Conveniently, these holes are on a 2″ bolt circle; this is actually the same as the CIM electric 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 used to make up to 72 unique equipment ratios, the the majority 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 Regular Bearings, rated for 20,000+ RPM
AGMA-11 quality planet and sun gears made from hardened 4140 steel
Ever-Power Gearboxes deliver 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 pc controlled shifting system. The output shaft links the actuator motor to the vehicle transmitting and facilitates effortless change from two to four wheel drive in trucks and sport utility vehicles. The other end supports a planetary gear system that products torque to operate the control program. 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 metal to a density of 7.7 grams/cc. It comes with an unnotched Charpy effect strength above 136J (110 ft-lbs), elongation higher than 8% and a tensile power of 65 MPa (95,000 psi).
Manual transmission
A manual tranny is operated through a clutch and a moveable stick. The driver selects the gear, and can generally move from any forwards gear into another without having to go to the next gear in the sequence. The exception to this would be some types of cars, which permit the driver to choose only the next lower or following higher gear – that is what’s known as a sequential manual transmission
In virtually any manual transmission, there is a flywheel attached to 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 can be to hold 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 usually down, the pressure plate no longer functions on the disc, and the clutch plate stops obtaining power from the engine. This is what allows you to change gears without harming your vehicle transmission. A manual transmission is characterized by selectable gear ratios – this implies that selected equipment pairs could be locked to the result shaft that’s in the tranny. That’s what we imply when we utilize the term “main gears.” An automatic transmission, on the other hand, uses planetary gears, which function quite differently.
Planetary gears and the automated transmission
The foundation of your automated transmission is what is known as a planetary, or epicycloidal, gear set. This is what enables you to change your vehicle gear ratio without needing to engage or disengage a clutch.
A planetary gear set has 3 parts. The guts gear may be the sun. The smaller gears that rotate around sunlight are referred to as the planets. And lastly, the annulus is the band that engages with the planets on the outer side. If you were wanting to know how planetary gears got the name, now you know!
In the gearbox, the initial gear set’s world carrier is linked to the ring of the next gear set. Both sets are linked by an axle which delivers power to the wheels. If one section of the planetary equipment is locked, the others continue to rotate. This means that gear changes are easy and soft.
The typical automated gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, cars experienced an overdrive gearbox furthermore to the primary gearbox, to reduce 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 actually increased RPM rather than reducing it. Today, automatic transmissions have absorbed the overdrive, and the configuration is now three planetaries – two for regular procedure and one to become overdrive, yielding four ahead gears.
The future
Some automobiles now actually squeeze away five gears using three planetaries. This type of 5-speed or 6-speed gearbox is now increasingly common.
This is by no means a thorough discussion of primary gears and planetary gears. If you want to find out more about how your car transmission works, presently there are countless online language resources that will deliver information that’s just as complex as you want to buy to be.
The planetary gear system is a crucial component in speed reduced amount 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 may be accomplished using this system with same number of gears. This rate reduction is based on the number of tooth in each gear. The size of new system is compact. A theoretical calculation is performed at concept level to find the desired reduced amount of speed. Then the planetary gear system is definitely simulated using ANSYS software program 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 advancement for the hub decrease with planetary gears. The utmost 3.67 reduction is achieved with planetary system. The stresses in each pin is calculated using FEA.
Planetary gears are widely used in the industry due to their benefits of compactness, high power-to-weight ratios, high efficiency, and so on. However, planetary gears such as for example that in wind turbine transmissions always operate under dynamic conditions with internal and external load fluctuations, which accelerate the occurrence of gear failures, such as tooth crack, pitting, spalling, put on, scoring, scuffing, etc. As one of the failure modes, equipment tooth crack at the tooth root due to tooth bending fatigue or excessive load is definitely investigated; how it influences the dynamic features of planetary gear 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 is definitely obtained and incorporated right into a planetary equipment dynamic model to investigate the consequences of the tooth root crack on the planetary gear powerful responses. Tooth root cracks on the sun gear and on the planet gear are considered, respectively, with different crack sizes and inclination angles. Finally, analysis regarding the influence of tooth root crack on the dynamic responses of the planetary gear system is performed with time and frequency domains, respectively. Moreover, the variations in the dynamic top features of the planetary equipment between the situations that tooth root crack on sunlight gear and on the planet gear are found.
Advantages of using planetary equipment motors in work
There are plenty of types of geared motors that can be used in search for the perfect movement within an engineering project. Considering the technical specs, the mandatory performance or space limitations of our design, you should consider to make use of one or the additional. In this article we will delve on the planetary gear motors or epicyclical equipment, so you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear systems are characterized by having gears whose disposition is very different from other models such as 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 bigger 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 upon its inner part) meshes with the satellites and contains the complete epicyclical train. Furthermore, the core may also become a middle 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 used in very different applications. Its cylindrical shape is easily adaptable to thousands of areas, ensuring a huge reduction in a very contained space.
Regularly this kind of drives can be utilized in applications that require higher degrees of precision. For example: Industrial automation machines, vending machines or robotics.
What are the main advantages of planetary gear motors?
Increased repeatability: Its higher speed radial and axial load offers reliability and robustness, minimizing the misalignment of the gear. In addition, uniform transmission and low vibrations at different loads provide a perfect repeatability.
Perfect precision: Most rotating angular stability enhances the accuracy and reliability of the motion.
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 improve this feature, your bearings lessen the losses that could take place by rubbing the shaft on the container directly. Thus, greater performance of the apparatus and a much smoother operation is achieved.
Very good degrees of efficiency: Planetary reducers offer greater efficiency and thanks to its design and internal layout losses are minimized during their work. Actually, today, this kind of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With more teeth in contact, the mechanism will be able to transmit and endure more torque. Furthermore, it can it in a more uniform manner.
Maximum versatility: The mechanism is within a cylindrical gearbox, which may be installed in almost any space.
Planetary gear program is a kind of epicyclic gear program used in precise and high-performance transmissions. We have vast experience in manufacturing planetary gearbox and equipment components such as sun gear, world carrier, and ring equipment in China.
We employ the innovative equipment and technology in production our gear pieces. Our inspection procedures comprise examination of the torque and materials for plastic, sintered metallic, and metal planetary gears. We offer 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. The sun gear 1 and band gear then rotate collectively at the same velocity. The stepped planet gears usually do not unroll. Thus the gear ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sun gear 3 and band gear 3 are directly coupled.
Sun gear #1 fixed
Example Gear Assembly #1
The input from gear assy (1) is transferred via the ring gear. When the sun gear 1 can be coupled to the axle, the initial gear stage of the stepped planet gears rolls off between your fixed sun gear 1, and the rotating band gear. One rotation of the ring gear (green arrow) results 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 earth carrier and the output is transferred via the band gear. The rotational relationship is certainly hereby reversed from gear assy #1. The planet carrier (crimson arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the ring gear (green arrow) when sunlight gear #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 usually 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 complete rotation of the ring gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sun gear #1 is carried forward without function, as it is definitely 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 earth carrier. The output is usually transferred via the ring gear. The rotational relationship can be 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.