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 word planetary transmission, as the planet gears rotate around sunlight 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 really 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 gear step of the stepped planet gears engages with sun gear #1. The second equipment step engages with sun gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sunlight equipment 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 particularly 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 any 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 motor) — these plates are custom created for each motor to provide ideal 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 makes it easy to change gear 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 enables you to change motors without the need to buy a particular pinion and press it on. In addition, the Ever-Power uses the same pilot and bolt circle as the CIM, allowing you to operate a Ever-Power anywhere a CIM electric motor mounts.
The Ever-Power has a variety of options for mounting. Each gearbox provides four 10-32 threaded holes at the top and bottom level of its casing for easy part 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 the identical to the CIM motor – anywhere you can attach a CIM-style engine, you can install a Ever-Power.
Other features include:
Six different planetary equipment stages can be used to generate up to 72 unique equipment ratios, the the majority 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 Electric motor, Tetrix TorqueNADO)
ABEC-1/ISO 492 Class Regular Bearings, rated for 20,000+ RPM
AGMA-11 quality world and sun gears made from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Make sure you grease before assembly.
gained an award of distinction in the ferrous category for a planetary equipment assembly system found in a four wheel drive computer controlled shifting system. The result shaft links the actuator engine to the vehicle transmitting and facilitates effortless differ from two to four wheel drive in trucks and sport utility automobiles. The other end facilitates a planetary gear system that materials torque to use the control system. The shaft output operates with 16 P/M planet gears and 3 P/M equipment carrier plates. The shaft is manufactured out of a proprietary high influence copper metal 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 power of 65 MPa (95,000 psi).
A manual tranny is operated through a clutch and a moveable stick. The driver selects the apparatus, and can generally move from any forwards equipment 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 choose only the next lower or following higher gear – this is what’s referred to as a sequential manual transmission
In any manual transmission, there exists a flywheel mounted on the crankshaft, and it spins combined with the crankshaft. Between the flywheel and the pressure plate can be a clutch disk. The function of the pressure plate is 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 down, the pressure plate no longer acts on the disc, and the clutch plate stops obtaining power from the engine. This is exactly what allows you to shift gears without harming your car transmission. A manual transmission is seen as a selectable equipment ratios – this means that selected gear pairs could be locked to the result shaft that’s inside the tranny. That’s what we imply when we utilize the term “primary gears.” An automated transmission, however, uses planetary gears, which function quite differently.
Planetary gears and the automated transmission
The foundation of your automated transmission is what is referred to as a planetary, or epicycloidal, gear set. This is exactly what enables you to change your vehicle gear ratio without needing to engage or disengage a clutch.
A planetary gear established has three parts. The guts gear is the sun. The smaller gears that rotate around sunlight are referred to as the planets. And finally, the annulus may be 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 understand!
In the gearbox, the 1st gear set’s world carrier is connected to the ring of the next gear set. The two sets are connected by an axle which delivers power to the tires. If one portion of the planetary gear is locked, others continue steadily to rotate. This implies that gear changes are easy and smooth.
The typical automatic gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, cars experienced an overdrive gearbox in addition to the primary gearbox, to lessen 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, automatic 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.
Some vehicles now actually squeeze out five gears using three planetaries. This type of 5-quickness or 6-swiftness gearbox is now increasingly common.
This is by no means a comprehensive discussion of primary gears and planetary gears. If you want to learn more about how your car transmission works, generally there are countless online resources that will deliver information that’s simply as complex as you want it to be.
The planetary gear system is a critical component in speed reduction of gear system. It consists of a ring gear, group of planetary gears, a sun gear and a carrier. It really is mainly utilized in high speed reduction transmission. More acceleration variation may be accomplished using this system with same amount of gears. This speed reduction is founded on the number of the teeth in each gear. The size of new system is compact. A theoretical calculation is performed at concept level to obtain the desired reduction of speed. Then your planetary gear system can be simulated using ANSYS software program for new development transmitting system. The ultimate validation is performed with the screening of physical parts. This idea is implemented in 9speed transmission system. Comparable 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 usually 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. However, planetary gears such as that in wind turbine transmissions constantly operate under dynamic circumstances with internal and external load fluctuations, which accelerate the occurrence of gear failures, such as tooth crack, pitting, spalling, use, scoring, scuffing, etc. As one of these failure modes, gear tooth crack at the tooth root due to tooth bending fatigue or excessive load is usually 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 gear pairs in mesh is usually obtained and incorporated right into a planetary equipment dynamic model to investigate the effects of the tooth root crack on the planetary gear 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 influence of tooth root crack on the dynamic responses of the planetary gear system is performed in time and frequency domains, respectively. Moreover, the distinctions in the dynamic features of the planetary gear between the instances that tooth root crack on sunlight gear and on earth gear are found.
Advantages of using planetary gear motors in work
There are plenty of types of geared motors that can be utilized in search for an ideal movement in an engineering project. Considering the technical specs, the mandatory performance or space restrictions of our design, you should ask yourself to make use of one or the various other. In this post we will delve on the planetary equipment motors or epicyclical gear, so you will know completely what its advantages are and find out some successful applications.
The planetary gear products are seen as a 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 larger 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 band: an outer band (with teeth upon its inner side) meshes with the satellites and contains the whole epicyclical train. Furthermore, the core may also become a middle of rotation for the outer ring, and can 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 utilized in very different applications. Its cylindrical shape is quickly adaptable to thousands of spaces, ensuring a sizable reduction in a very contained space.
Regularly this kind of drives can be used in applications that want higher levels of precision. For instance: Industrial automation devices, vending devices or robotics.
What are the main benefits 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 provide a perfect repeatability.
Perfect precision: Most rotating angular stability enhances the accuracy and reliability of the motion.
Lower noise level since there is more surface contact. Rolling is much softer and jumps are virtually nonexistent.
Greater durability: Because of its torsional rigidity and better rolling. To boost this feature, your bearings help reduce the losses that would take place by rubbing the shaft on the container directly. Thus, greater efficiency of the gear and a much smoother operation is achieved.
Very good degrees of efficiency: Planetary reducers provide greater efficiency and because of its design and internal layout losses are minimized throughout their work. Actually, today, this kind of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With more teeth connected, the mechanism can transmit and endure more torque. Furthermore, it can it in a far more uniform manner.
Maximum versatility: Its mechanism is within a cylindrical gearbox, which can be installed in almost any space.
Planetary gear program is a kind of epicyclic gear system found in precise and high-performance transmissions. We have vast experience in manufacturing planetary gearbox and equipment components such as for example sun gear, world carrier, and ring equipment in China.
We employ the most advanced gear and technology in production our gear sets. Our inspection processes comprise examination of the torque and components for plastic, sintered steel, 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 gear selected in gear assy (1) or (2), the sun gear 1 is coupled with the ring gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate collectively at the same quickness. The stepped world gears do not unroll. Therefore the apparatus 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 gear assy (1) is transferred via the ring gear. When the sun equipment 1 is certainly coupled to the axle, the 1st gear step of the stepped planet gears rolls off between the fixed sun gear 1, and the rotating ring gear. One rotation of the band 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 relationship is hereby reversed from gear assy #1. The earth carrier (reddish arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the band gear (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 gear #2 is usually coupled to the axle, the stepped planetary gears are pressured to rotate around the fixed sun gear on their second gear stage. The first equipment step rolls into the ring equipment. One complete rotation of the ring gear (green arrow) outcomes in 0.774 rotations of the planet carrier (red arrow). Sunlight equipment #1 is carried ahead without function, as it is 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 can be transferred via the ring gear. The rotational romantic relationship can be hereby reversed, instead of gear assy #1. The earth carrier (green arrow) rotates 0.774 of a complete rotation, leading to one full rotation of the ring equipment (red arrow), when sun equipment #2 is coupled to the axle.
PLANETARY GEAR SYSTEM