PLANETARY GEAR SYSTEM
A planetary transmission program (or Epicyclic system as it is also 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 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 really 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 sunlight gear #1. The next equipment step engages with sunlight gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sunlight equipment 1 with the ring gear, three ratio variants are achievable with each equipment assembly.
The Ever-Power is a battle-tested modular planetary gearbox system designed specifically for use in the Robotics marketplace. Designers choose among 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 the Ever-Power gearboxes include installation plates & hardware for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG electric motor) — these plates are customized designed for each motor to provide ideal piloting and high performance.
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 back of the gearbox. This helps it be easy to change gear ratios, encoders, motors, etc. without need to take apart your entire system. Another feature of the Ever-Power that means it is easy to use is the removable shaft coupler program. This system enables you to alter motors without the need to buy a special pinion and press it on. Furthermore, the Ever-Power uses the same pilot and bolt circle as the CIM, allowing you to run a Ever-Power anywhere a CIM engine mounts.
The Ever-Power has a selection of options for installation. 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. 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 engine, you can mount a Ever-Power.
Other features include:
Six different planetary gear stages can be used to create up to 72 unique gear ratios, the the majority of any kind of 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 Normal Bearings, rated for 20,000+ RPM
AGMA-11 quality planet 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 equipment assembly system used in a four wheel drive computer controlled shifting system. The output shaft links the actuator motor to the vehicle transmission and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end supports a planetary gear system 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 impact copper metal to a density of 7.7 grams/cc. It comes with an unnotched Charpy effect strength above 136J (110 ft-lbs), elongation greater than 8% and a tensile strength of 65 MPa (95,000 psi).
A manual transmission is operated by means of a clutch and a moveable stick. The driver selects the apparatus, and can usually 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 permit the driver to select only the next lower or following higher gear – that 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 the flywheel and the pressure plate is definitely a clutch disk. The function of the pressure plate is definitely to hold the clutch disk against the flywheel. When the clutch pedal is definitely up, the flywheel causes the clutch plate to spin. When the clutch pedal is usually 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 shift gears without harming your car transmission. A manual tranny is seen as a selectable gear ratios – this implies that selected gear pairs can be locked to the result shaft that’s within the tranny. That’s what we indicate when we use the term “main gears.” An automated transmission, however, uses planetary gears, which work quite differently.
Planetary gears and the automated transmission
The basis of your automatic transmission is what’s known as a planetary, or epicycloidal, gear set. This is exactly what enables you to change your car gear ratio without needing to engage or disengage a clutch.
A planetary gear set has three parts. The guts gear is the sun. Small gears that rotate around the sun are referred to as the planets. And lastly, the annulus is the band that engages with the planets on the outer side. In the event that you were wanting to know how planetary gears got the name, now you know!
In the gearbox, the 1st gear set’s world carrier is connected to the band of the second gear set. The two sets are connected by an axle which provides power to the tires. If one area of the planetary equipment is locked, the others continue to rotate. This means that gear adjustments are easy and simple.
The typical automated gearbox has two planetary gears, with three forward gears and one invert. 30 years ago, vehicles experienced an overdrive gearbox in addition to the primary gearbox, to reduce the engine RPM and “stretch” the high gear with the idea of achieving fuel economic climate during highway generating. This overdrive used an individual planetary. The issue was that this actually increased RPM rather than 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 forwards gears.
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 in no way 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 that will deliver information that’s simply as complicated as you want to buy to be.
The planetary gear system is a crucial component in speed reduction of gear program. It consists of a ring gear, set of planetary gears, a sun gear and a carrier. It really is mainly utilized in high speed reduction transmission. More speed variation can be achieved using this technique with same amount of gears. This velocity 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 have the desired reduced amount of speed. Then your planetary gear program is certainly simulated using ANSYS software program for new development transmitting system. The ultimate validation is done with the assessment of physical parts. This idea is implemented in 9speed transmission system. Similar concept is in advancement for the hub decrease with planetary gears. The utmost 3.67 reduction is achieved with planetary program. The stresses in each pin is usually calculated using FEA.
Planetary gears are widely used in the industry because of their benefits of compactness, high power-to-weight ratios, high efficiency, and so on. Nevertheless, planetary gears such as for example that in wind turbine transmissions usually operate under dynamic circumstances with internal and exterior load fluctuations, which accelerate the occurrence of equipment failures, such as for example tooth crack, pitting, spalling, wear, scoring, scuffing, etc. As one of the failure modes, gear tooth crack at the tooth root because of tooth bending fatigue or excessive load is definitely investigated; how it influences the powerful features of planetary equipment program is studied. The used 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 equipment pairs in mesh is obtained and incorporated into a planetary equipment dynamic model to investigate the consequences of the tooth root crack on the planetary equipment 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 equipment system is performed in time and frequency domains, respectively. Moreover, the variations in the dynamic top features of the planetary equipment between the instances that tooth root crack on the sun gear and on the planet gear are found.
Advantages of using planetary gear motors in your projects
There are plenty of types of geared motors that can be utilized in search for an ideal movement within an engineering project. Taking into account the technical specs, the required performance or space limitations of our design, you should ask yourself to make use of one or the other. In this post we will delve on the planetary gear motors or epicyclical gear, so you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear units are characterized by having gears whose disposition is quite different from 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 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 ring (with teeth upon its inner aspect) 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 automatic 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 areas, ensuring a large reduction in a very contained space.
Regularly this kind of drives can be utilized in applications that require higher degrees of precision. For example: Industrial automation devices, vending devices or robotics.
What are the main 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 tranny 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 because 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 improve this feature, your bearings lessen the losses that would occur by rubbing the shaft on the container directly. Thus, greater effectiveness of the gear and a much smoother procedure 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 kind of drive mechanisms are those that offer greater efficiency.
Increased torque transmission: With an increase of teeth in contact, the mechanism has the capacity to transmit and endure more torque. In addition, it can it in a more uniform manner.
Maximum versatility: Its mechanism is within a cylindrical gearbox, which can be installed in nearly every space.
Planetary gear system is a kind of epicyclic gear program used in precise and high-effectiveness transmissions. We have vast experience in production planetary gearbox and equipment components such as sun gear, planet carrier, and ring equipment in China.
We employ the most advanced devices and technology in manufacturing our gear units. Our inspection processes comprise study of the torque and components for plastic, sintered metallic, and metal planetary gears. We offer various assembly designs 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 equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and ring gear then rotate collectively at the same velocity. The stepped planet gears do not unroll. Hence the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sunlight gear 3 and ring gear 3 are directly 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 can be coupled to the axle, the first gear stage of the stepped world 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 cases like this 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 resulting in one full rotation of the band equipment (green arrow) when sunlight 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 gear. When the sun equipment #2 is coupled to the axle, the stepped planetary gears are forced to rotate around the fixed sun gear on their second gear stage. The first equipment step rolls into the ring gear. One full rotation of the band gear (green arrow) outcomes in 0.774 rotations of the planet carrier (red arrow). Sun equipment #1 is carried forward without function, as it is definitely driven on by the 1st gear stage 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 certainly transferred via the band 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, resulting in one full rotation of the band equipment (red arrow), when sun gear #2 is coupled to the axle.
PLANETARY GEAR SYSTEM