PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system as it is also known), consists normally of a centrally pivoted sunlight 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 benefit of a planetary transmission is determined by 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 stage of the stepped planet gears engages with sunlight gear #1. The second gear step engages with sunlight gear #2. With sun gear 1 or 2 2 coupled to the axle,or the coupling of sun equipment 1 with the ring gear, three ratio variations 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 among 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 electric motor) — these plates are custom designed for each motor to provide ideal piloting and high efficiency.
What good 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 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 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, enabling you to operate a Ever-Power anywhere a CIM engine mounts.
The Ever-Power includes a variety of options for mounting. Each gearbox provides four 10-32 threaded holes on top and bottom level of its casing for easy part mounting. In addition, additionally, there are holes on leading which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is the identical to the CIM engine – anywhere you can mount a CIM-style electric motor, you can mount a Ever-Power.
Other features include:
Six different planetary gear stages can be utilized to produce up to 72 unique equipment ratios, the most of any 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 Engine, Tetrix TorqueNADO)
ABEC-1/ISO 492 Class Regular Bearings, rated for 20,000+ RPM
AGMA-11 quality world and sun gears made from hardened 4140 steel
Ever-Power Gearboxes deliver disassembled. Please grease before assembly.
gained 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 output shaft links the actuator electric motor to the vehicle transmission and facilitates effortless differ from two to four wheel drive in trucks and sport utility vehicles. The other end supports a planetary gear system that products torque to operate the control system. The shaft output operates with 16 P/M planet gears and 3 P/M equipment carrier plates. The shaft is manufactured out of a proprietary high influence copper metal 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 transmission is operated through a clutch and a moveable stay. The driver selects the apparatus, and can generally move from any forwards equipment into another without having to visit the next gear in the sequence. The exception to this will be some types of cars, which allow the driver to choose only another lower or next higher gear – this 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 together with the crankshaft. Between the flywheel and the pressure plate is usually a clutch disk. The function of the pressure plate is certainly 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 usually down, the pressure plate no more acts on the disc, and the clutch plate stops obtaining power from the engine. This is exactly what allows you to change gears without harming your car transmission. A manual transmitting is characterized by selectable equipment ratios – this means that selected gear pairs can be locked to the output shaft that’s in the transmission. 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 automatic 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 established has three parts. The guts gear may be the sun. The smaller 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 thinking how planetary gears got the name, now you understand!
In the gearbox, the 1st gear set’s planet carrier is connected to the band of the second gear set. The two sets are linked by an axle which delivers power to the wheels. If one part of the planetary gear is locked, others continue steadily 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 invert. 30 years ago, cars got an overdrive gearbox in addition to the main gearbox, to reduce the engine RPM and “stretch” the high equipment with the thought of achieving fuel economy during highway driving. 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 now three planetaries – two for normal procedure and one to become overdrive, yielding four forwards gears.
The future
Some vehicles now actually squeeze away five gears using three planetaries. This type of 5-swiftness or 6-velocity gearbox is becoming increasingly common.
This is in no way a thorough discussion of primary gears and planetary gears. If you want to learn more about how your car transmission works, presently there are countless online resources that will deliver information that’s simply as complex as you want to buy to be.
The planetary gear system is a crucial component in speed reduction of gear system. It consists of a ring gear, set of planetary gears, a sunlight gear and a carrier. It really is mainly used in high speed reduction transmission. More velocity variation may be accomplished using this system with same number of gears. This rate reduction is founded on the number of tooth in each gear. The size of new system is compact. A theoretical calculation is conducted at concept level to have the desired reduction of speed. Then the planetary gear program is usually simulated using ANSYS software for new development transmission system. The ultimate validation is done with the screening of physical parts. This concept is implemented in 9speed transmission system. Comparable concept is in development for the hub decrease with planetary gears. The maximum 3.67 decrease is achieved with planetary program. The stresses in each pin is certainly 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. Nevertheless, planetary gears such as that in wind turbine transmissions always operate under dynamic circumstances with internal and external load fluctuations, which accelerate the occurrence of gear 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 exhaustion or excessive load is definitely investigated; how it influences the powerful features of planetary gear system 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 definitely obtained and incorporated right into a planetary gear dynamic model to research the effects of the tooth root crack on the planetary gear powerful responses. Tooth root cracks on the sun gear and on earth gear are believed, respectively, with different crack sizes and inclination angles. Finally, analysis regarding the impact 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 features of the planetary gear between the situations that tooth root crack on the sun gear and on the planet gear are found.
Benefits of using planetary gear motors in work
There are numerous types of geared motors that can be used in search for an ideal movement in an engineering project. Considering the technical specs, the mandatory performance or space restrictions of our design, you should consider 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 thoroughly what its advantages are and find out some successful applications.
The planetary gear units are seen as a having gears whose disposition is very 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 larger 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 band: an outer band (with teeth upon its inner aspect) meshes with the satellites and contains the complete epicyclical train. Furthermore, the core can also become a middle of rotation for the external ring, and can easily change directions.
For accuracy and reliability, many automated transmissions currently use planetary equipment motors. If we discuss sectors this reducer offers great versatility and can be utilized in very different applications. Its cylindrical shape is quickly adaptable to thousands of spaces, ensuring a sizable reduction in an extremely contained space.
Regularly this type of drives can be used in applications that want higher degrees of precision. For example: Industrial automation machines, 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.
Ideal precision: Most rotating angular stability improves the accuracy and reliability of the motion.
Lower noise level since there is more surface area contact. Rolling is much softer and jumps are practically nonexistent.
Greater durability: Due to its torsional rigidity and better rolling. To boost this feature, your bearings help reduce the losses that would occur by rubbing the shaft on the package directly. Thus, greater performance of the gear 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.
Increased torque transmission: With more teeth connected, the mechanism will be able to transmit and withstand more torque. Furthermore, it can it in a far more uniform manner.
Maximum versatility: Its mechanism is within a cylindrical gearbox, which may be installed in almost any space.
Planetary gear system is a kind of epicyclic gear program used in precise and high-performance transmissions. We have vast experience in production planetary gearbox and gear components such as for example sun gear, planet carrier, and ring gear in China.
We employ the most advanced apparatus and technology in manufacturing our gear sets. Our inspection procedures comprise examination of the torque and materials for plastic, sintered metal, 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), the sun gear 1 is in conjunction 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 speed. The stepped world 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 gear 1 is coupled to the axle, the 1st gear stage of the stepped world gears rolls off between the fixed sun gear 1, and the rotating band gear. 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 earth carrier and the output is transferred via the band gear. The rotational relationship is usually hereby reversed from gear assy #1. The planet carrier (reddish arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the band gear (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 gear #2 is usually coupled to the axle, the stepped planetary gears are forced to rotate around the set sun gear on their second gear stage. The first gear step rolls into the ring gear. One complete rotation of the ring gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sunlight gear #1 is carried ahead without function, as it is certainly 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 usually transferred via the band gear. The rotational relationship is 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 ring gear (red arrow), when sun equipment #2 is coupled to the axle.