planetary gear system

PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system since it is also known), consists normally of a centrally pivoted sunlight gear, a ring equipment and several planet gears which rotate between these.
This assembly concept explains the term planetary transmission, as the earth gears rotate around sunlight gear as in the astronomical sense the planets rotate around our sun.
The benefit of a planetary transmission depends upon load distribution over multiple planet gears. It is thereby possible to transfer high torques utilizing a compact design.
Gear assembly 1 and equipment assembly 2 of the Ever-Power SPEEDHUB 500/14 have two selectable sunlight gears. The first equipment stage of the stepped world gears engages with sun gear #1. The second equipment step engages with sun gear #2. With sun gear 1 or 2 2 coupled to the axle,or the coupling of sunlight 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 market. Designers choose among four result shafts, configure a single-stage planetary using among 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 custom created for each motor to supply perfect piloting and high efficiency.
What great 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 gear ratios, encoders, motors, etc. without need to take apart your complete system. Another feature of the Ever-Power that makes it easy to use may be the removable shaft coupler system. This system enables you to change motors without the 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 motor mounts.
The Ever-Power has a variety of options for installation. Each gearbox offers four 10-32 threaded holes on top and bottom of its casing for easy aspect mounting. In addition, there are also holes on leading which allow face-mounting. Conveniently, these holes are on a 2″ bolt circle; this is actually the identical to the CIM electric motor – anywhere you can install a CIM-style electric motor, you can attach a Ever-Power.
Other features include:
Six different planetary equipment stages can be utilized to produce up to 72 unique equipment 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 Motor, 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.
won 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 electric motor to the vehicle tranny and facilitates effortless differ from two to four wheel drive in trucks and sport utility vehicles. The other end supports a planetary gear program that supplies torque to use the control system. The shaft result 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 has an unnotched Charpy impact 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 apparatus, 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 select only another lower or following higher gear – that is what’s known as a sequential manual transmission
In any manual transmission, there is a flywheel attached to the crankshaft, and it spins along with the crankshaft. Between your flywheel and the pressure plate is certainly a clutch disk. The function of the pressure plate is certainly 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 can be down, the pressure plate no longer acts on the disc, and the clutch plate stops getting power from the engine. This is what allows you to change gears without harming your car transmission. A manual transmitting is characterized by selectable gear ratios – this means that selected gear pairs can be locked to the output shaft that’s within the tranny. That’s what we mean when we use the term “primary gears.” An automated transmission, on the other hand, uses planetary gears, which function quite differently.
Planetary gears and the automated transmission
The basis 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 car gear ratio without having to engage or disengage a clutch.
A planetary gear set has three parts. The center gear may be the sun. The smaller 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. In the event that you were questioning how planetary gears got the name, now you understand!
In the gearbox, the first gear set’s planet carrier is linked to the band of the second gear set. Both sets are connected by an axle which provides power to the tires. If one section of the planetary gear is locked, the others continue 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 invert. 30 years ago, cars had an overdrive gearbox in addition to the main gearbox, to lessen the engine RPM and “stretch” the high gear with the thought of achieving fuel economy during highway generating. This overdrive used an individual planetary. The problem 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 operation and one to become overdrive, yielding four forward gears.
The future
Some vehicles now actually squeeze away five gears using three planetaries. This kind of 5-quickness or 6-rate gearbox is becoming increasingly common.
This is by no means a comprehensive discussion of main gears and planetary gears. If you would like to learn more about how your vehicle transmission works, presently there are countless online language resources which will deliver information that’s just as complicated as you want it to be.
The planetary gear program is a crucial component in speed reduction of gear system. It includes a ring gear, set of planetary gears, a sunlight equipment and a carrier. It is mainly used in high speed decrease transmission. More quickness variation may be accomplished using this technique with same number of gears. This velocity reduction is based on the number of tooth in each gear. How big is new system is small. A theoretical calculation is conducted at idea level to obtain the desired reduction of speed. Then your planetary gear system is definitely simulated using ANSYS software for new development transmitting system. The ultimate validation is performed with the assessment of physical parts. This concept is implemented in 9speed transmission system. Similar concept is in development for the hub decrease with planetary gears. The utmost 3.67 decrease 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 that in wind turbine transmissions at all times operate under dynamic conditions with internal and external load fluctuations, which accelerate the occurrence of equipment failures, such as tooth crack, pitting, spalling, use, scoring, scuffing, etc. As one of the failure modes, gear tooth crack at the tooth root because of tooth bending exhaustion or excessive load can be investigated; how it influences the dynamic top 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 approach, the mesh stiffness of gear pairs in mesh can be obtained and incorporated right into a planetary gear dynamic model to investigate the effects of the tooth root crack on the planetary equipment powerful responses. Tooth root cracks on the sun gear and on the planet gear are believed, respectively, with different crack sizes and inclination angles. Finally, analysis about the influence of tooth root crack on the powerful responses of the planetary gear system is performed with time and frequency domains, respectively. Moreover, the distinctions in the dynamic top features of the planetary equipment between the situations that tooth root crack on sunlight gear and on earth gear are found.
Benefits of using planetary gear motors in work
There are various types of geared motors that can be used in search for an ideal movement within an engineering project. Considering the technical specifications, the mandatory performance or space limitations of our design, you should consider to make use of one or the 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 very 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 earth 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 side) meshes with the satellites and contains the whole epicyclical train. In addition, the core can also become a center 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 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 big reduction in an extremely contained space.
Regularly this kind of drives can be utilized in applications that require higher levels of precision. For example: Industrial automation machines, vending machines 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 apparatus. In addition, uniform transmission and low vibrations at different loads give a perfect repeatability.
Perfect precision: Most rotating angular stability improves the accuracy and reliability of the movement.
Lower noise level because there is more surface area contact. Rolling is much softer and jumps are practically nonexistent.
Greater durability: Due to its torsional rigidity and better rolling. To improve this feature, your bearings help reduce the losses that would occur by rubbing the shaft on the box directly. Thus, greater effectiveness of the apparatus and a much smoother operation is achieved.
Very good levels of efficiency: Planetary reducers provide greater efficiency and because of its design and internal layout losses are minimized during their work. Actually, today, this kind of drive mechanisms are those that offer greater efficiency.
Improved torque transmission: With more teeth connected, the mechanism has the capacity to transmit and withstand more torque. In addition, it does it in a more uniform manner.
Maximum versatility: Its mechanism is contained in a cylindrical gearbox, which may be installed in almost any space.
Planetary gear program is a kind of epicyclic gear program found in precise and high-efficiency transmissions. We have vast experience in production planetary gearbox and equipment components such as for example sun gear, planet carrier, and ring gear in China.
We employ the innovative apparatus and technology in manufacturing our gear models. Our inspection processes comprise study of the torque and components for plastic, sintered metal, and steel planetary gears. We offer various assembly designs 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 in conjunction with the ring gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate with each other 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 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 first gear stage of the stepped planet gears rolls off between the fixed sun gear 1, and the rotating band equipment. One rotation of the band gear (green arrow) results 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 planet carrier and the output is transferred via the ring gear. The rotational romantic relationship is usually hereby reversed from equipment assy #1. The planet carrier (reddish colored arrow) rotates 0.682 of a complete rotation leading to one full rotation of the ring equipment (green arrow) when sun 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 gear. When the sun gear #2 can be coupled to the axle, the stepped planetary gears are forced to rotate around the set sun gear on the second gear step. The first gear step rolls in to the ring equipment. One complete rotation of the band gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sun equipment #1 is carried forwards without function, since it can be driven on by the initial 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 relationship is usually 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 band gear (red arrow), when sun gear #2 is coupled to the axle.