PLANETARY GEAR SYSTEM
A planetary transmission program (or Epicyclic system as it is also 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 word planetary transmission, as the planet gears rotate around the sun 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 really is thereby feasible 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 sunlight gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sun gear 1 with the ring gear, three ratio variations are achievable with each equipment assembly.
The Ever-Power is a battle-tested modular planetary gearbox system designed particularly 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 create a multi-stage gearbox using any of the different ratio combinations.
All of the Ever-Power gearboxes include mounting plates & hardware for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG motor) — these plates are customized made for each motor to provide perfect piloting and high performance.
What good is a versatile system if it’s not simple to take apart 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 mechanism. Another feature of the Ever-Power that means it is easy to use is the removable shaft coupler program. This system allows you to modify motors with no need to buy a particular pinion and press it on. Furthermore, the Ever-Power uses the same pilot and bolt circle as the CIM, allowing you to run a Ever-Power anywhere a CIM engine mounts.
The Ever-Power includes a selection of options for mounting. Each gearbox has four 10-32 threaded holes at the top and bottom level of its housing 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 the same as the CIM motor – anywhere you can mount 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 (BAG, Mini CIM, RS-550, RS-775, 775pro, Redline, AM-9015, and CIM)
Adapts to a variety 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. Please grease before assembly.
earned 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 output shaft links the actuator engine to the vehicle transmission and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end facilitates a planetary gear system that products torque to use the control program. The shaft output operates with 16 P/M planet gears and 3 P/M equipment carrier plates. The shaft is made from a proprietary high impact copper steel 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).
A manual transmitting is operated through a clutch and a moveable stay. The driver selects the gear, and can usually move from any ahead equipment into another without needing to go to the next equipment in the sequence. The exception to this will be some types of race cars, which permit the driver to choose only the next lower or next higher gear – this is what’s referred to as a sequential manual transmission
In virtually any manual transmission, there exists a flywheel mounted on the crankshaft, and it spins together with the crankshaft. Between the 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 usually down, the pressure plate no more 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 seen as a selectable equipment ratios – this implies that selected equipment pairs could be locked to the result shaft that’s in the transmission. That’s what we suggest when we utilize the term “main gears.” An automatic transmission, however, uses planetary gears, which work quite differently.
Planetary gears and the automatic transmission
The foundation of your automatic transmission is what’s 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 arranged has 3 parts. The guts gear is the sun. Small gears that rotate around the sun are known as the planets. And finally, the annulus is the ring that engages with the planets on the external side. If you were wondering how planetary gears got the name, now you know!
In the gearbox, the 1st gear set’s planet carrier is connected to the ring of the next gear set. The two sets are connected by an axle which delivers power to the wheels. If one portion of the planetary equipment is locked, others continue steadily to rotate. This means that gear adjustments are easy and soft.
The typical automated gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, vehicles got an overdrive gearbox furthermore to the primary gearbox, to lessen the engine RPM and “stretch” the high equipment with the idea of achieving fuel economic climate during highway traveling. This overdrive used a single planetary. The issue was that actually increased RPM rather than reducing it. Today, automated transmissions possess absorbed the overdrive, and the configuration is now three planetaries – two for normal procedure and one to become overdrive, yielding four forwards gears.
Some vehicles now actually squeeze out five gears using three planetaries. This type of 5-rate or 6-quickness gearbox is now increasingly common.
This is in no way a thorough discussion of primary gears and planetary gears. If you want to find out more about how your vehicle transmission works, generally there are countless online resources that will deliver information that’s simply as complicated as you want it to be.
The planetary gear system is a critical component in speed reduction of gear program. It consists of a ring gear, set of planetary gears, a sun gear and a carrier. It really is mainly utilized in high speed reduction transmission. More rate variation can be achieved using this system with same quantity of gears. This acceleration reduction is based on the number of teeth in each gear. The size of new system is compact. A theoretical calculation is performed at concept level to have the desired reduced amount of speed. Then the planetary gear program is certainly simulated using ANSYS software program for new development transmission system. The final validation is done with the testing of physical parts. This idea is implemented in 9speed transmission system. Comparable concept is in advancement for the hub reduction with planetary gears. The maximum 3.67 reduction is achieved with planetary program. The stresses in each pin is calculated using FEA.
Planetary gears are widely used in the industry due to their advantages of compactness, high power-to-weight ratios, high efficiency, and so on. However, planetary gears such as for example that in wind mill transmissions usually operate under dynamic conditions with internal and exterior load fluctuations, which accelerate the occurrence of gear failures, such as for example tooth crack, pitting, spalling, wear, scoring, scuffing, etc. As you of these failure modes, equipment tooth crack at the tooth root due to tooth bending fatigue or excessive load is investigated; how it influences the powerful 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 process, the mesh stiffness of equipment pairs in mesh is obtained and incorporated into a planetary equipment dynamic model to research the consequences of the tooth root crack on the planetary gear dynamic responses. Tooth root cracks on sunlight gear and on earth gear are considered, 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 features of the planetary gear 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 many types of geared motors that can be used in search for the perfect movement in an engineering project. Taking into account the technical specs, the required performance or space restrictions of our style, you should ask yourself to use one or the additional. In this article we will delve on the planetary gear motors or epicyclical gear, which means you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear units are characterized by having gears whose disposition is quite not the same as 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 equipment. It has a bigger size and rotates on the central axis.
The planet carrier: Its objective is to hold up to 3 gears of the same size, which mesh with sunlight gear.
Crown or ring: an outer ring (with teeth on its inner part) meshes with the satellites possesses the complete epicyclical train. Furthermore, the core may also become a middle of rotation for the external ring, allowing it to easily change directions.
For accuracy and reliability, many automatic transmissions currently use planetary gear motors. If we discuss sectors this reducer provides great versatility and can be used in completely different applications. Its cylindrical shape is quickly adaptable to an infinite number of areas, ensuring a sizable reduction in a very contained space.
Regularly this type of drives can be used in applications that want higher degrees of precision. For instance: Industrial automation devices, vending devices 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 apparatus. In addition, uniform tranny and low vibrations at different loads provide a perfect repeatability.
Ideal precision: Most rotating angular stability boosts 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: Because of its torsional rigidity and better rolling. To boost this feature, your bearings lessen the losses that could take place by rubbing the shaft on the package directly. Thus, greater performance of the gear and a much smoother procedure is achieved.
Very good degrees 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 provide greater efficiency.
Increased torque transmission: With an increase of teeth in contact, the mechanism will be able to transmit and endure more torque. Furthermore, it can 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 system used in precise and high-effectiveness transmissions. We’ve vast experience in manufacturing planetary gearbox and gear components such as sun gear, world carrier, and ring gear in China.
We employ the most advanced products and technology in production our gear sets. Our inspection processes comprise examination of the torque and materials for plastic, sintered steel, and metal planetary gears. You can expect various assembly styles for your gear reduction projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment 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. Sunlight gear 1 and band gear then rotate jointly at the same quickness. The stepped world gears do not unroll. Therefore the gear ratio is 1:1.
Gear assy (3) aquires direct gear based on the same principle. Sunlight gear 3 and band 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 gear 1 is usually coupled to the axle, the initial gear stage of the stepped world gears rolls off between the fixed sun gear 1, and the rotating ring 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 cases like this of gear assy #2 the input is transferred via the earth carrier and the output is transferred via the band gear. The rotational relationship can be hereby reversed from equipment assy #1. The earth carrier (red arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the band equipment (green arrow) when sun gear #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 equipment #2 is coupled to the axle, the stepped planetary gears are forced to rotate around the fixed sun gear on their second gear stage. The first equipment step rolls into the ring gear. One full rotation of the ring gear (green arrow) outcomes in 0.774 rotations of the earth carrier (red arrow). Sun gear #1 is carried forward without function, as it is usually 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 transferred via the band gear. The rotational romantic relationship is certainly hereby reversed, as opposed to gear assy #1. The planet carrier (green arrow) rotates 0.774 of a complete rotation, resulting in one full rotation of the ring equipment (red arrow), when sun equipment #2 is coupled to the axle.
PLANETARY GEAR SYSTEM