planetary gear system

PLANETARY GEAR SYSTEM
A planetary transmission program (or Epicyclic system as it can be known), consists normally of a centrally pivoted sunlight gear, a ring gear and several planet gears which rotate between these.
This assembly concept explains the term planetary transmission, as the earth gears rotate around the sun gear as in the astronomical sense the planets rotate around our sun.
The advantage of a planetary transmission depends upon load distribution over multiple planet gears. It is thereby possible 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 sun gears. The first gear step of the stepped planet gears engages with sun gear #1. The second equipment step engages with sunlight gear #2. With sun gear one or two 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 market. Designers choose one of four output shafts, configure a single-stage planetary using one of six different reductions, or build a multi-stage gearbox using any of the various ratio combinations.
All of 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 customized made for each motor to provide ideal piloting and high performance.
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 rear 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 means it is easy to use is the removable shaft coupler system. This system allows you to modify 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, allowing you to operate a Ever-Power anywhere a CIM motor mounts.
The Ever-Power has a variety of options for mounting. Each gearbox offers four 10-32 threaded holes on top and bottom level of its housing for easy aspect mounting. In addition, additionally, there are 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 engine – anywhere you can attach a CIM-style electric motor, you can mount a Ever-Power.
Other features include:
Six different planetary gear stages can be used to develop up to 72 unique gear ratios, the the majority of any kind of 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 Motor, Tetrix TorqueNADO)
ABEC-1/ISO 492 Class Normal Bearings, rated for 20,000+ RPM
AGMA-11 quality world and sun gears made 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 equipment assembly system used in a four wheel drive computer managed shifting system. The result shaft links the actuator electric motor to the vehicle transmitting and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end facilitates a planetary gear program that items torque to operate 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 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).
Manual transmission
A manual transmitting is operated through a clutch and a moveable stick. The driver selects the gear, and can generally move from any forward gear into another without having to visit the next equipment in the sequence. The exception to the will be some types of race 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 virtually any manual transmission, there exists a flywheel mounted on the crankshaft, and it spins together with the crankshaft. Between your flywheel and the pressure plate can be a clutch disk. The function of the pressure plate is usually to hold the clutch disk against the flywheel. When the clutch pedal can be 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 vehicle transmission. A manual transmission is seen as a selectable equipment ratios – this implies that selected equipment pairs could be locked to the output shaft that’s in the transmitting. That’s what we mean when we use the term “main gears.” An automated transmission, however, uses planetary gears, which work quite differently.
Planetary gears and the automatic transmission
The basis of your automated transmission is what’s known 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 three parts. The guts gear may be the sun. Small gears that rotate around sunlight are referred to as the planets. And lastly, the annulus may be the band 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 initial gear set’s world carrier is linked to the ring of the next gear set. The two sets are connected by an axle which provides power to the tires. If one part of the planetary equipment is locked, others continue steadily to rotate. This means that gear adjustments are easy and even.
The typical automated gearbox has two planetary gears, with three forward gears and one invert. 30 years ago, cars experienced an overdrive gearbox furthermore to the main gearbox, to reduce the engine RPM and “stretch” the high gear with the thought of achieving fuel economic climate during highway driving. This overdrive used an individual planetary. The issue was that actually increased RPM rather than reducing it. Today, automated transmissions have absorbed the overdrive, and the configuration is now three planetaries – two for normal operation and one to act as overdrive, yielding four ahead gears.
The future
Some automobiles now actually squeeze away five gears using three planetaries. This type of 5-rate or 6-acceleration gearbox is now increasingly common.
This is in no way a comprehensive discussion of primary gears and planetary gears. If you want to learn more about how your vehicle transmission works, generally there are countless online language resources that will deliver information that’s just as complex as you want it to be.
The planetary gear system is a crucial component in speed reduced amount of gear program. It includes a ring gear, group of planetary gears, a sunlight gear and a carrier. It is mainly used in high speed decrease transmission. More rate variation can be achieved using this technique with same number of gears. This velocity reduction is founded on the number of tooth in each gear. The size of new system is compact. A theoretical calculation is performed at concept level to get the desired reduction of speed. Then your planetary gear program is simulated using ANSYS software program 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 development for the hub reduction with planetary gears. The maximum 3.67 reduction is achieved with planetary system. The stresses in each pin is usually calculated using FEA.
Planetary gears are trusted in the industry due to their benefits of compactness, high power-to-weight ratios, high efficiency, and so forth. Nevertheless, planetary gears such as for example that in wind mill transmissions usually operate under dynamic circumstances with internal and exterior load fluctuations, which accelerate the occurrence of equipment failures, such as tooth crack, pitting, spalling, use, scoring, scuffing, etc. As you of the failure modes, gear tooth crack at the tooth root because of tooth bending exhaustion or excessive load is certainly investigated; how it influences the powerful features of planetary gear system 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 is obtained and incorporated right into a planetary gear dynamic model to investigate the effects of the tooth root crack on the planetary gear dynamic responses. Tooth root cracks on the sun gear and on earth gear are considered, respectively, with different crack sizes and inclination angles. Finally, analysis about the impact of tooth root crack on the dynamic responses of the planetary gear system is performed with time and frequency domains, respectively. Moreover, the differences in the dynamic features of the planetary equipment between the situations 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 plenty of types of geared motors that can be utilized in search for the perfect movement in an engineering project. Taking into account the technical specifications, the required performance or space restrictions of our design, you should ask yourself to use one or the various other. In this post we will delve on the planetary gear motors or epicyclical gear, which means you will know completely what its advantages are and find out some successful applications.
The planetary gear systems are characterized by having gears whose disposition is quite not the same as other models like 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 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 on its inner aspect) meshes with the satellites possesses 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 gear motors. If we talk about sectors this reducer offers great versatility and can be utilized in completely different applications. Its cylindrical form is very easily adaptable to an infinite number of spaces, ensuring a large reduction in an extremely contained space.
Regularly this kind of drives can be utilized in applications that require higher degrees of precision. For instance: Industrial automation devices, vending devices or robotics.
What are the primary benefits of planetary gear motors?
Increased repeatability: Its greater speed radial and axial load offers reliability and robustness, minimizing the misalignment of the gear. In addition, uniform transmitting and low vibrations at different loads give a perfect repeatability.
Perfect precision: Most rotating angular stability boosts the accuracy and reliability of the movement.
Lower noise level since there is more surface 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 happen by rubbing the shaft on the box directly. Thus, greater performance of the apparatus and a much smoother operation is achieved.
Very good levels of efficiency: Planetary reducers offer 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 offer greater efficiency.
Improved torque transmission: With an increase of teeth in contact, the mechanism is able to transmit and endure more torque. Furthermore, it does it in a more uniform manner.
Maximum versatility: Its mechanism is within a cylindrical gearbox, which may be installed in nearly every space.
Planetary gear program is a kind of epicyclic gear program found in precise and high-performance transmissions. We have vast experience in production planetary gearbox and equipment components such as for example sun gear, world carrier, and ring equipment in China.
We employ the innovative equipment and technology in production our gear units. Our inspection processes comprise study of the torque and components for plastic, sintered metal, 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 in conjunction with the ring gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate together at the same rate. The stepped planet gears usually do not unroll. Hence the gear ratio is 1:1.
Gear assy (3) aquires direct gear predicated 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 gear. When the sun gear 1 is usually coupled to the axle, the 1st gear step of the stepped world gears rolls off between your fixed sun gear 1, and the rotating band 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 band gear. The rotational relationship is usually hereby reversed from equipment assy #1. The earth carrier (reddish colored arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the ring gear (green arrow) when sun 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 equipment #2 is definitely coupled to the axle, the stepped planetary gears are pressured to rotate around the set sun gear on their second gear step. The first gear step rolls in to the ring gear. One full rotation of the band gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sunlight gear #1 is carried forward without function, as it is usually 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 planet carrier. The output is certainly transferred via the band gear. The rotational relationship is definitely 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.