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 term 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 sun gear #1. The second gear step engages with sun 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 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 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 some 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 created for each motor to provide perfect piloting and high efficiency.
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 makes it 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. 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 includes a selection of options for mounting. Each gearbox offers four 10-32 threaded holes at the top and bottom level of its casing for easy side mounting. In addition, there are also holes on leading 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 attach a Ever-Power.
Other features include:
Six different planetary gear stages can be used to produce up to 72 unique gear ratios, the most of any COTS gearbox in FRC or FTC.
Adapts to a variety 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 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 found in a four wheel drive computer controlled shifting system. The result shaft links the actuator engine 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 operate the control program. The shaft result operates with 16 P/M planet gears and 3 P/M equipment carrier plates. The shaft is manufactured out of a proprietary high effect copper metal to a density of 7.7 grams/cc. It has 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 through a clutch and a moveable stick. The driver selects the apparatus, and can generally move from any forwards equipment into another without needing to go to the next gear in the sequence. The exception to this will be some types of cars, which allow the driver to select only the next lower or following higher gear – that is what’s referred to 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 definitely a clutch disk. The function of the pressure plate is definitely to carry 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 usually down, the pressure plate no longer functions 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 equipment pairs can be locked to the result shaft that’s in the tranny. That’s what we indicate when we utilize the term “primary gears.” An automated transmission, however, uses planetary gears, which function 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 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 may be 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. If you were wondering how planetary gears got the name, now you know!
In the gearbox, the 1st gear set’s world carrier is connected to the ring of the second gear set. Both sets are connected by an axle which delivers power to the wheels. If one area of the planetary gear is locked, the others continue 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, vehicles got an overdrive gearbox furthermore to the primary gearbox, to reduce the engine RPM and “stretch” the high equipment with the thought of achieving fuel economic climate during highway generating. This overdrive used an individual planetary. The issue 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 forwards gears.
Some vehicles now actually squeeze out five gears using three planetaries. This kind of 5-quickness or 6-swiftness gearbox is becoming increasingly common.
This is in no way a comprehensive discussion of main gears and planetary gears. If you would like to find out more about how your vehicle transmission works, right now 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 critical component in speed reduced amount of gear program. It includes a ring gear, set of planetary gears, a sun gear and a carrier. It really is mainly used in high speed reduction transmission. More velocity 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 get the desired reduction of speed. Then the planetary gear system is usually simulated using ANSYS software program for new development transmitting system. The final validation is performed with the examining of physical parts. This idea is implemented in 9speed transmission system. Similar 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 can be 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 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 one of the failure modes, gear tooth crack at the tooth root because of tooth bending fatigue or excessive load can be investigated; how it influences the dynamic 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 equipment pairs in mesh is usually obtained and incorporated into a planetary equipment dynamic model to research the consequences of the tooth root crack on the planetary gear dynamic responses. Tooth root cracks on sunlight gear and on earth gear are believed, respectively, with different crack sizes and inclination angles. Finally, analysis regarding the influence of tooth root crack on the powerful 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 situations 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 many types of geared motors that can be used in search for the perfect movement within an engineering project. Taking into account the technical specifications, 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 equipment motors or epicyclical gear, so you will know completely 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 gear. It has a bigger size and rotates on the central axis.
The earth carrier: Its objective is to hold up to 3 gears of the same size, which mesh with sunlight gear.
Crown or band: an outer band (with teeth upon its inner part) meshes with the satellites possesses the whole epicyclical train. In addition, the core can also become a middle 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 discuss sectors this reducer provides great versatility and can be used in very different applications. Its cylindrical shape is quickly adaptable to thousands of spaces, ensuring a big reduction in a very contained space.
Regularly this kind of drives can be utilized in applications that want higher degrees of precision. For example: Industrial automation machines, vending machines or robotics.
What are the primary benefits of planetary gear motors?
Increased repeatability: Its higher speed radial and axial load offers reliability and robustness, minimizing the misalignment of the apparatus. 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 practically nonexistent.
Greater durability: Because of its torsional rigidity and better rolling. To improve this feature, your bearings lessen the losses that could occur by rubbing the shaft on the container directly. Thus, greater performance of the gear and a much smoother procedure is achieved.
Very good degrees of efficiency: Planetary reducers provide greater efficiency and because of its design and internal layout losses are minimized throughout their work. Actually, today, this kind of drive mechanisms are those that offer greater efficiency.
Increased torque transmission: With an increase of teeth in contact, the mechanism will be able 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 may 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 manufacturing planetary gearbox and gear components such as sun gear, planet carrier, and ring equipment in China.
We employ the most advanced gear and technology in manufacturing our gear models. Our inspection processes comprise examination of the torque and materials for plastic, sintered steel, and steel 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. Sunlight gear 1 and band gear then rotate collectively at the same velocity. The stepped world gears usually 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 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 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 ring equipment. One rotation of the band gear (green arrow) outcomes 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 definitely 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 band equipment (green arrow) when sunlight gear #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 definitely coupled to the axle, the stepped planetary gears are forced to rotate around the fixed sun gear on their second gear stage. The first gear 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 ahead without function, as it can be 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 usually transferred via the ring gear. The rotational relationship can be 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 band equipment (red arrow), when sun gear #2 is coupled to the axle.
PLANETARY GEAR SYSTEM