PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system as it can be known), consists normally of a centrally pivoted sun 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 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 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 second gear step engages with sun gear #2. With sun gear one or two 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 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 build 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 customized designed for each motor to supply perfect piloting and high efficiency.
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 helps it be easy to change gear ratios, encoders, motors, etc. without have to take apart your entire system. Another feature of the Ever-Power that makes it easy to use is the removable shaft coupler system. This system enables 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 operate a Ever-Power anywhere a CIM electric motor mounts.
The Ever-Power has a selection of options for mounting. Each gearbox provides four 10-32 threaded holes on top and bottom level of its housing for easy side mounting. In addition, there are also 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 electric motor – anywhere you can install a CIM-style electric motor, you can mount a Ever-Power.
Other features include:
Six different planetary gear stages can be used to make up to 72 unique equipment ratios, the the majority 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 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 deliver disassembled. Please grease before assembly.
earned an award of distinction in the ferrous category for a planetary equipment assembly system found in a four wheel drive pc controlled shifting system. The output shaft links the actuator 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 products torque to operate the control program. The shaft output operates with 16 P/M planet gears and 3 P/M equipment carrier plates. The shaft is made from 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 higher than 8% and a tensile power of 65 MPa (95,000 psi).
A manual tranny 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 needing to go to the next equipment in the sequence. The exception to this would be some types of cars, which allow the driver to choose 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 can be to hold the clutch disk against the flywheel. When the clutch pedal is certainly up, the flywheel causes the clutch plate to spin. When the clutch pedal is 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 change gears without harming your car transmission. A manual transmission is characterized by selectable gear ratios – this implies that selected equipment pairs could be locked to the result shaft that’s in the tranny. That’s what we suggest when we utilize the term “main gears.” An automatic transmission, on the other hand, uses planetary gears, which function quite differently.
Planetary gears and the automated transmission
The foundation of your automated transmission is what is referred to as a planetary, or epicycloidal, gear set. This is what allows you to change your vehicle gear ratio without needing to engage or disengage a clutch.
A planetary gear set has 3 parts. The guts gear is the sun. Small gears that rotate around sunlight are referred to as the planets. And finally, the annulus is the band that engages with the planets on the outer side. If you were wanting to know how planetary gears got the name, now you know!
In the gearbox, the initial gear set’s planet carrier is linked to the ring of the next gear set. Both sets are linked by an axle which delivers power to the tires. If one part of the planetary equipment is locked, the others continue to rotate. This means that gear changes are easy and simple.
The typical automatic gearbox has two planetary gears, with three forward gears and one reverse. 30 years ago, cars experienced an overdrive gearbox furthermore to the primary gearbox, to reduce the engine RPM and “stretch” the high gear with the thought of achieving fuel economy during highway traveling. This overdrive used an individual planetary. The problem was that actually increased RPM instead of reducing it. Today, automated transmissions possess absorbed the overdrive, and the configuration is currently three planetaries – two for regular procedure and one to become overdrive, yielding four forward gears.
Some automobiles now actually squeeze away five gears using three planetaries. This type of 5-quickness or 6-quickness gearbox is now increasingly common.
This is by no means a thorough discussion of main gears and planetary gears. If you want to learn more about how your vehicle transmission works, there are countless online resources which will deliver information that’s just as complex as you want to buy to be.
The planetary gear program is a crucial component in speed reduced amount of gear system. It includes a ring gear, group of planetary gears, a sun equipment and a carrier. It is mainly utilized in high speed decrease transmission. More velocity variation may be accomplished using this technique with same amount of gears. This velocity reduction is based on the number of tooth in each gear. The size of new system is compact. A theoretical calculation is conducted at concept level to find the desired reduction of speed. Then the planetary gear system is definitely simulated using ANSYS software program for new development transmission system. The ultimate validation is done with the assessment of physical parts. This concept 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 system. The stresses in each pin is usually 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 for example that in wind turbine transmissions generally operate under dynamic conditions with internal and external load fluctuations, which accelerate the occurrence of gear failures, such as tooth crack, pitting, spalling, put on, scoring, scuffing, etc. As one of the failure modes, gear tooth crack at the tooth root due to tooth bending fatigue or excessive load is definitely investigated; how it influences the dynamic features of planetary gear program 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 right into a planetary equipment dynamic model to investigate the consequences of the tooth root crack on the planetary gear powerful responses. Tooth root cracks on the sun gear and on earth gear are considered, respectively, with different crack sizes and inclination angles. Finally, analysis regarding the influence 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 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 equipment motors in work
There are plenty of types of geared motors that can be used in search for the perfect movement within an engineering project. Considering the technical specifications, the mandatory performance or space limitations of our style, you should consider to use one or the additional. In this post we will delve on the planetary equipment motors or epicyclical equipment, so you will know thoroughly what its advantages are and discover 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 bigger size and rotates on the central axis.
The planet carrier: Its objective is to hold up to 3 gears of the same size, which mesh with sunlight gear.
Crown or ring: an outer ring (with teeth upon its inner part) meshes with the satellites and contains the complete epicyclical train. Furthermore, the core can 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 provides great versatility and can be used in completely different applications. Its cylindrical shape is very easily adaptable to thousands of spaces, ensuring a huge 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 better 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 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 area 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 could take place 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 offer greater efficiency and thanks to its design and internal layout losses are minimized during their work. Actually, today, this kind of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With more teeth connected, the mechanism will be able to transmit and withstand more torque. Furthermore, it can it in a more uniform manner.
Maximum versatility: The mechanism is within a cylindrical gearbox, which can be installed in nearly every space.
Planetary gear program is a kind of epicyclic gear system used in precise and high-performance transmissions. We have vast experience in manufacturing planetary gearbox and equipment components such as sun gear, world carrier, and ring gear in China.
We employ the innovative equipment and technology in production our gear pieces. Our inspection procedures comprise examination of the torque and components for plastic, sintered metal, 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 gear selected in equipment assy (1) or (2), the sun gear 1 is coupled with the ring gear in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate collectively at the same velocity. The stepped planet gears usually do not unroll. Thus the gear ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sun gear 3 and band gear 3 are straight coupled.
Sun gear #1 fixed
Example Gear Assembly #1
The input from equipment assy (1) is transferred via the ring equipment. When the sun equipment 1 can be coupled to the axle, the initial gear stage of the stepped planet gears rolls off between your fixed sun gear 1, and the rotating band gear. One rotation of the band gear (green arrow) outcomes in 0.682 rotations of the earth carrier (red arrow).
Example Gear Assembly #2
In this case 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 hereby reversed from equipment assy #1. The planet carrier (red arrow) rotates 0.682 of a complete rotation leading to one full rotation of the ring gear (green arrow) when sunlight equipment #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 gear #2 is definitely coupled to the axle, the stepped planetary gears are pressured to rotate around the fixed sun gear on the second gear step. The first equipment step rolls in to the ring gear. One complete 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 planet carrier. The output is transferred via the ring gear. The rotational relationship can be 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 gear #2 is coupled to the axle.
PLANETARY GEAR SYSTEM