planetary gear system

PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system since it can be 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 word planetary transmission, as the planet gears rotate around the sun 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 feasible to transfer high torques employing a compact design.
Gear assembly 1 and gear assembly 2 of the Ever-Power SPEEDHUB 500/14 have two selectable sunlight gears. The first equipment stage of the stepped planet gears engages with sun gear #1. The next gear step engages with sun gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sunlight gear 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 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 & equipment for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG motor) — these plates are custom designed for each motor to provide ideal piloting and high performance.
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 equipment ratios, encoders, motors, etc. without have to take apart your complete system. Another feature of the Ever-Power that means it is easy to use may be the removable shaft coupler program. This system enables you to alter motors with no need to buy a special 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 includes a selection of options for mounting. Each gearbox provides four 10-32 threaded holes on top and bottom of its housing for easy aspect mounting. In addition, there are also holes on the front which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is 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 gear 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 variety 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.
won an award of distinction in the ferrous category for a planetary gear assembly system found in a four wheel drive computer managed shifting system. The output shaft links the actuator motor to the vehicle tranny and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end supports a planetary gear program that materials torque to use 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 impact copper steel 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 transmitting is operated by means of a clutch and a moveable stay. The driver selects the gear, and can generally move from any forward gear into another without having to go to the next equipment in the sequence. The exception to this will be some types of race cars, which allow the driver to select only another lower or next higher gear – this 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 your flywheel and the pressure plate is usually a clutch disk. The function of the pressure plate can be to carry 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 certainly down, the pressure plate no longer works on the disc, and the clutch plate stops getting power from the engine. This is exactly what allows you to shift gears without harming your car transmission. A manual transmission is characterized by selectable gear ratios – this implies that selected gear pairs could be locked to the result shaft that’s in the transmission. That’s what we mean when we use the term “primary gears.” An automated transmission, however, uses planetary gears, which work quite differently.
Planetary gears and the automatic transmission
The foundation of your automated transmission is what is referred to as a planetary, or epicycloidal, gear set. This is what enables you to change your vehicle gear ratio without having to engage or disengage a clutch.
A planetary gear arranged has 3 parts. The guts gear may be the sun. The smaller gears that rotate around the sun are known as the planets. And lastly, the annulus is 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 know!
In the gearbox, the initial gear set’s planet carrier is connected to the band of the second gear set. The two sets are linked by an axle which delivers power to the wheels. If one area of the planetary equipment is locked, the others continue steadily to rotate. This means that gear changes are easy and soft.
The typical automatic gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, vehicles had an overdrive gearbox furthermore to the main gearbox, to reduce the engine RPM and “stretch” the high equipment with the idea of achieving fuel economic climate during highway traveling. This overdrive used an individual planetary. The issue was that this actually increased RPM instead of reducing it. Today, automatic transmissions possess absorbed the overdrive, and the configuration is currently three planetaries – two for normal operation and one to become overdrive, yielding four forward gears.
The future
Some automobiles 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 comprehensive discussion of main gears and planetary gears. If you want to learn more about how your vehicle transmission works, generally there are countless online language resources which will deliver information that’s simply as complex as you want to buy to be.
The planetary gear program is a critical component in speed reduction of gear system. It contains a ring gear, group of planetary gears, a sunlight equipment and a carrier. It is mainly utilized in high speed reduction transmission. More speed variation may be accomplished using this technique with same number of gears. This swiftness reduction is founded on the number of teeth in each gear. How big is new system is small. A theoretical calculation is conducted at concept level to obtain the desired reduced amount of speed. Then the planetary gear system is certainly simulated using ANSYS software for new development transmitting system. The final validation is performed 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 utmost 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 forth. However, planetary gears such as that in wind turbine transmissions constantly operate under dynamic circumstances with internal and exterior 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, equipment tooth crack at the tooth root due to tooth bending exhaustion or excessive load is certainly investigated; how it influences the powerful top features of planetary equipment program is studied. The used tooth root crack model can simulate the propagation procedure for the crack along tooth width and crack depth. With this approach, the mesh stiffness of equipment pairs in mesh can be obtained and incorporated into a planetary equipment dynamic model to research 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 about the influence of tooth root crack on the dynamic 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 situations that tooth root crack on sunlight 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 an ideal movement within an engineering project. Taking into account the technical specs, the mandatory performance or space restrictions of our design, you should ask yourself to make use of one or the other. In this article we will delve on the planetary equipment motors or epicyclical gear, which means you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear devices are characterized by having gears whose disposition is quite 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 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 and contains the whole epicyclical train. In addition, the core may also become a center of rotation for the external ring, allowing it to easily change directions.
For accuracy and reliability, many automated transmissions currently use planetary gear motors. If we talk about sectors this reducer offers great versatility and can be used in completely different applications. Its cylindrical shape is quickly adaptable to an infinite number of spaces, ensuring a large reduction in an extremely contained space.
Regularly this type of drives can be used in applications that require higher degrees of precision. For example: Industrial automation machines, vending machines or robotics.
What are the primary advantages 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 increases the accuracy and reliability of the movement.
Lower noise level since there is more surface contact. Rolling is much 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 would take place by rubbing the shaft on the container directly. Thus, greater performance of the gear 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 throughout their work. In fact, today, this type of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With more teeth connected, the mechanism is able to transmit and endure more torque. Furthermore, it does it in a far more uniform manner.
Maximum versatility: The mechanism is within a cylindrical gearbox, which may be installed in almost any space.
Planetary gear system is a type of epicyclic gear program 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 gear in China.
We employ the most advanced devices and technology in manufacturing our gear units. Our inspection procedures comprise examination of the torque and materials for plastic, sintered steel, and metal planetary gears. We offer various assembly styles 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), the sun gear 1 is coupled with the ring equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate with each other at the same rate. The stepped world gears do not unroll. Therefore the gear ratio is 1:1.
Gear assy (3) aquires direct gear predicated 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 equipment. When the sun equipment 1 is coupled to the axle, the 1st gear stage of the stepped planet gears rolls off between your 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 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 relationship is hereby reversed from equipment assy #1. The earth carrier (crimson arrow) rotates 0.682 of a complete rotation leading to one full rotation of the band gear (green arrow) when sunlight equipment #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 can be coupled to the axle, the stepped planetary gears are pressured to rotate around the set sun gear on the second gear step. The first equipment step rolls into the ring gear. One complete rotation of the band gear (green arrow) results in 0.774 rotations of the earth carrier (red arrow). Sunlight gear #1 is carried forwards without function, since it is certainly driven on by the 1st gear step 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 ring gear. The rotational romantic relationship is usually hereby reversed, instead of gear assy #1. The planet 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.

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