PLANETARY GEAR SYSTEM
A planetary transmission program (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 word planetary transmission, as the earth gears rotate around sunlight 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 utilizing 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 stage of the stepped planet gears engages with sun gear #1. The second equipment step engages with sunlight gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sun equipment 1 with the ring gear, three ratio variants are achievable with each gear 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 among six different reductions, or create a multi-stage gearbox using any of the different ratio combinations.
All the Ever-Power gearboxes include mounting plates & hardware for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG engine) — these plates are customized made for each motor to provide perfect piloting and high effectiveness.
What great 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 system. Another feature of the Ever-Power that means it is easy to use may be the removable shaft coupler system. This system allows 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 run a Ever-Power anywhere a CIM engine mounts.
The Ever-Power has a selection of options for mounting. Each gearbox has four 10-32 threaded holes on top and bottom of its casing for easy side 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 the identical to the CIM engine – anywhere you can mount a CIM-style engine, you can attach a Ever-Power.
Other features include:
Six different planetary gear stages can be used to create up to 72 unique equipment ratios, the most 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 Motor, Tetrix TorqueNADO)
ABEC-1/ISO 492 Class Regular Bearings, rated for 20,000+ RPM
AGMA-11 quality planet and sun gears created from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Please grease before assembly.
won an award of distinction in the ferrous category for a planetary equipment assembly system used in a four wheel drive pc controlled 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 vehicles. The other end supports a planetary gear program that items torque to operate the control system. The shaft output operates with 16 P/M world gears and 3 P/M equipment carrier plates. The shaft is made from a proprietary high influence copper steel to a density of 7.7 grams/cc. It comes with an unnotched Charpy influence 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 stay. The driver selects the gear, and can usually move from any ahead equipment into another without having to go to the next gear in the sequence. The exception to the will be some types of race cars, which permit the driver to select only the next lower or following higher gear – this is what’s known as a sequential manual transmission
In virtually any manual transmission, there is a flywheel mounted on the crankshaft, and it spins together with the crankshaft. Between your flywheel and the pressure plate is usually a clutch disk. The function of the pressure plate can be to hold 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 obtaining power from the engine. This is what allows you to change gears without harming your car transmission. A manual tranny is seen as a selectable gear ratios – this implies that selected gear pairs could be locked to the result shaft that’s inside the tranny. That’s what we mean when we utilize the term “primary gears.” An automatic transmission, on the other hand, uses planetary gears, which function 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 exactly what allows you to change your vehicle gear ratio without having to engage or disengage a clutch.
A planetary gear set has three parts. The center gear may be the sun. Small gears that rotate around sunlight are referred to as the planets. And lastly, the annulus is the band that engages with the planets on the external side. If you were questioning how planetary gears got the name, now you know!
In the gearbox, the initial gear set’s world carrier is linked to the band of the second gear set. Both 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 means that gear changes are easy and simple.
The typical automated gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, cars acquired 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 a single planetary. The issue was that actually increased RPM instead of reducing it. Today, automatic transmissions possess absorbed the overdrive, and the configuration is now three planetaries – two for regular operation and one to act as overdrive, yielding four forward gears.
Some vehicles now actually squeeze away five gears using three planetaries. This type of 5-velocity or 6-velocity gearbox is becoming increasingly common.
This is in no way a thorough discussion of main gears and planetary gears. If you want to find out more about how your car transmission works, presently there are countless online language resources that may deliver information that’s just as complicated as you want to buy to be.
The planetary gear program is a critical component in speed reduced amount of gear program. It contains a ring gear, set of planetary gears, a sunlight equipment and a carrier. It is mainly utilized in high speed decrease transmission. More swiftness variation can be achieved using this technique with same quantity of gears. This rate reduction is based on the number of the teeth in each gear. The size of new system is compact. A theoretical calculation is conducted at concept level to obtain the desired reduction of speed. Then your planetary gear program can be simulated using ANSYS software for new development tranny system. The ultimate validation is done with the assessment of physical parts. This concept is implemented in 9speed transmission system. Comparable concept is in development for the hub reduction with planetary gears. The maximum 3.67 decrease is achieved with planetary program. The stresses in each pin is calculated using FEA.
Planetary gears are widely used in the industry because of their advantages of compactness, high power-to-weight ratios, high efficiency, and so on. Nevertheless, planetary gears such as for example that in wind mill transmissions always operate under dynamic conditions with internal and external load fluctuations, which accelerate the occurrence of equipment 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 can be investigated; how it influences the powerful top 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 certainly obtained and incorporated into a planetary equipment dynamic model to investigate the consequences of the tooth root crack on the planetary gear dynamic 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 regarding the impact of tooth root crack on the dynamic responses of the planetary gear system is performed in time and frequency domains, respectively. Moreover, the variations in the dynamic features of the planetary gear between the instances that tooth root crack on sunlight gear and on the planet gear are found.
Advantages of using planetary gear motors in work
There are numerous types of geared motors that can be utilized in search for an ideal movement in an engineering project. Considering the technical specifications, the mandatory performance or space limitations of our style, you should ask yourself to use one or the other. In this post we will delve on the planetary gear motors or epicyclical equipment, so 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 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 gear. 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 ring: an outer band (with teeth on its inner aspect) meshes with the satellites possesses the whole 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 offers great versatility and can be used in very different applications. Its cylindrical form is very easily adaptable to an infinite number of areas, ensuring a large reduction in a very contained space.
Regularly this kind of drives can be used in applications that require higher degrees of precision. For example: Industrial automation devices, vending devices or robotics.
What are the primary advantages of planetary gear motors?
Increased repeatability: Its higher speed radial and axial load offers reliability and robustness, minimizing the misalignment of the gear. 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 motion.
Lower noise level because there is more surface area contact. Rolling is much softer and jumps are virtually nonexistent.
Greater durability: Because of 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 efficiency of the apparatus and a much smoother operation is achieved.
Very good degrees of efficiency: Planetary reducers provide greater efficiency and thanks to its design and internal layout losses are minimized during their work. Actually, today, this type of drive mechanisms are those that provide greater efficiency.
Increased torque transmission: With an increase of teeth in contact, the mechanism has the capacity to transmit and withstand more torque. Furthermore, it does it in a more uniform manner.
Maximum versatility: Its mechanism is contained in a cylindrical gearbox, which may be installed in nearly every space.
Planetary gear program is a kind of epicyclic gear program used in precise and high-effectiveness transmissions. We’ve vast experience in manufacturing planetary gearbox and equipment components such as sun gear, world carrier, and ring equipment in China.
We employ the innovative devices and technology in manufacturing our gear models. 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 reduction projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct gear selected in equipment assy (1) or (2), sunlight gear 1 is coupled with the ring gear in gear assy (1) or gear assy (2) respectively. Sunlight gear 1 and ring gear then rotate with each other at the same quickness. The stepped planet gears usually 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 band 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 gear 1 is certainly coupled to the axle, the first gear step of the stepped planet gears rolls off between the fixed sun gear 1, and the rotating band gear. One rotation of the ring gear (green arrow) results in 0.682 rotations of the planet 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 ring gear. The rotational relationship is certainly hereby reversed from gear assy #1. The planet carrier (reddish colored arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the ring equipment (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 equipment. When the sun equipment #2 is certainly coupled to the axle, the stepped planetary gears are forced to rotate around the set sun gear on the second gear step. The first equipment step rolls in to the ring equipment. One full rotation of the band gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sun equipment #1 is carried forward without function, as it is certainly 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 is certainly transferred via the band gear. The rotational romantic relationship is usually hereby reversed, as opposed to gear assy #1. The earth carrier (green arrow) rotates 0.774 of a complete rotation, resulting in one full rotation of the band gear (red arrow), when sun equipment #2 is coupled to the axle.
PLANETARY GEAR SYSTEM