PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system since it is also known), consists normally of a centrally pivoted sun gear, a ring gear and several planet 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 is thereby feasible to transfer high torques utilizing 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 next gear step engages with sun gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sun equipment 1 with the band gear, three ratio variations 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 one of 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 engine) — these plates are custom designed for each motor to supply 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 rear of the gearbox. This makes it easy to change gear ratios, encoders, motors, etc. without need to take apart your complete 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 particular pinion and press it on. In addition, the Ever-Power uses the same pilot and bolt circle as the CIM, allowing you to operate a Ever-Power anywhere a CIM engine mounts.
The Ever-Power includes a selection of options for installation. Each gearbox provides four 10-32 threaded holes on top and bottom of its housing for easy side mounting. In addition, there are also holes on the front which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is actually the identical to the CIM engine – anywhere you can mount a CIM-style engine, you can mount a Ever-Power.
Other features include:
Six different planetary equipment stages can be utilized to generate up to 72 unique equipment ratios, the the majority 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 variety of FTC motors (AndyMark NeveRest, REV HD Hex Electric 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.
earned an award of distinction in the ferrous category for a planetary gear assembly system found in a four wheel drive computer controlled shifting system. The result shaft links the actuator engine to the vehicle transmitting and facilitates effortless differ from two to four wheel drive in trucks and sport utility automobiles. The other end facilitates a planetary gear system that items torque to operate the control system. 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 impact copper steel 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 strength of 65 MPa (95,000 psi).
A manual transmission is operated through a clutch and a moveable stick. The driver selects the gear, and can usually move from any forward equipment into another without needing to go to the next equipment in the sequence. The exception to this will be some types of cars, which permit the driver to select only another lower or following higher gear – that is what’s referred to as a sequential manual transmission
In any manual transmission, there exists a flywheel attached to the crankshaft, and it spins combined with the crankshaft. Between your flywheel and the pressure plate is usually a clutch disk. The function of the pressure plate is certainly to carry the clutch disk against the flywheel. When the clutch pedal is usually up, the flywheel causes the clutch plate to spin. When the clutch pedal is certainly down, the pressure plate no more acts on the disc, and the clutch plate stops getting power from the engine. This is exactly what allows you to shift gears without harming your vehicle transmission. A manual tranny is characterized by selectable gear ratios – this means that selected gear pairs can be locked to the output shaft that’s within the transmitting. That’s what we imply when we utilize the term “main gears.” An automated transmission, on the other hand, uses planetary gears, which function quite differently.
Planetary gears and the automatic transmission
The basis of your automatic transmission is what is known as a planetary, or epicycloidal, gear set. This is exactly what enables you to change your car gear ratio without having to engage or disengage a clutch.
A planetary gear set has 3 parts. The guts gear may be the sun. The smaller gears that rotate around the sun are known as the planets. And finally, the annulus may be the band that engages with the planets on the external side. If you were wondering how planetary gears got the name, now you know!
In the gearbox, the first gear set’s planet carrier is linked to the band of the second gear set. The two sets are linked by an axle which provides power to the wheels. If one part of the planetary gear is locked, others continue to rotate. This implies that gear adjustments are easy and soft.
The typical automatic gearbox has two planetary gears, with three forward gears and one invert. 30 years ago, cars had an overdrive gearbox furthermore to the main 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 a single planetary. The issue was that actually increased RPM rather than reducing it. Today, automated transmissions have absorbed the overdrive, and the configuration is currently three planetaries – two for normal operation and one to act as overdrive, yielding four forward gears.
Some automobiles now actually squeeze out five gears using three planetaries. This type of 5-swiftness or 6-rate gearbox is now 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 vehicle transmission works, right now there are countless online language 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 reduced amount of gear system. It contains a ring gear, set of planetary gears, a sun gear and a carrier. It is mainly used in high speed reduction transmission. More speed variation can be achieved using this technique with same number of gears. This quickness 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 have the desired reduced amount of speed. Then the planetary gear system can be simulated using ANSYS software for new development transmission system. The ultimate validation is performed with the tests of physical parts. This concept is implemented in 9speed transmission system. Similar concept is in advancement for the hub reduction with planetary gears. The utmost 3.67 reduction is achieved with planetary system. The stresses in each pin is 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 often 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 you of these failure modes, gear tooth crack at the tooth root because of tooth bending exhaustion or excessive load is certainly 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 process, the mesh stiffness of gear pairs in mesh is obtained and incorporated right into a planetary equipment dynamic model to research the consequences of the tooth root crack on the planetary equipment powerful responses. Tooth root cracks on the sun gear and on the planet 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 equipment system is performed with time and frequency domains, respectively. Moreover, the distinctions in the dynamic top features of the planetary gear between the instances that tooth root crack on the sun gear and on earth gear are found.
Benefits of using planetary equipment motors in work
There are several types of geared motors that can be utilized in search for an ideal movement in an engineering project. Taking into account the technical specs, the mandatory performance or space limitations of our style, you should ask yourself to use one or the various other. In this article we will delve on the planetary equipment motors or epicyclical gear, and that means you will know completely what its advantages are and discover some successful applications.
The planetary gear products are seen as a having gears whose disposition is quite not the same as 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 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 ring (with teeth on its inner side) meshes with the satellites possesses the complete epicyclical train. In addition, the core can also become a middle of rotation for the outer 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 provides great versatility and can be used in completely different applications. Its cylindrical shape is very easily adaptable to thousands of areas, ensuring a big reduction in an extremely contained space.
Regularly this kind of drives can be utilized in applications that want higher levels of precision. For instance: Industrial automation machines, vending devices or robotics.
What are the primary advantages of planetary gear motors?
Increased repeatability: Its better speed radial and axial load offers reliability and robustness, minimizing the misalignment of the apparatus. In addition, uniform transmission and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability improves the accuracy and reliability of the movement.
Lower noise level since there is more surface contact. Rolling is a lot softer and jumps are practically nonexistent.
Greater durability: Due to its torsional rigidity and better rolling. To improve this feature, your bearings help reduce the losses that would happen by rubbing the shaft on the box directly. Thus, greater effectiveness of the apparatus and a much smoother operation is achieved.
Very good degrees of efficiency: Planetary reducers offer greater efficiency and because of its design and internal layout losses are minimized during their work. Actually, today, this type of drive mechanisms are those that offer greater efficiency.
Increased torque transmission: With more teeth in contact, the mechanism can transmit and endure more torque. In addition, it does it in a more uniform manner.
Maximum versatility: The mechanism is within a cylindrical gearbox, which may be installed in almost any space.
Planetary gear system is a type of epicyclic gear system found in precise and high-performance transmissions. We’ve vast experience in manufacturing planetary gearbox and gear components such as sun gear, planet carrier, and ring gear in China.
We employ the innovative apparatus and technology in manufacturing our gear units. Our inspection procedures comprise study of the torque and materials for plastic, sintered metal, and steel planetary gears. You can expect various assembly designs for your gear decrease projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment 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. The sun gear 1 and band gear then rotate with each other at the same rate. The stepped planet gears do not unroll. Hence 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 directly coupled.
Sun gear #1 fixed
Example Gear Assembly #1
The input from equipment assy (1) is transferred via the ring gear. When the sun equipment 1 is coupled to the axle, the 1st gear step of the stepped planet gears rolls off between your fixed sun gear 1, and the rotating ring gear. One rotation of the band gear (green arrow) results in 0.682 rotations of the earth 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 hereby reversed from equipment assy #1. The earth carrier (crimson 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 equipment. When the sun gear #2 is certainly coupled to the axle, the stepped planetary gears are forced to rotate around the fixed sun gear on their second gear step. The first gear step rolls into the ring gear. One full rotation of the band gear (green arrow) results in 0.774 rotations of the earth carrier (red arrow). Sun gear #1 is carried ahead without function, as it can be driven on by the first 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 definitely transferred via the ring gear. The rotational romantic relationship is definitely hereby reversed, as opposed to gear assy #1. The earth carrier (green arrow) rotates 0.774 of a complete rotation, leading to one full rotation of the ring gear (red arrow), when sun gear #2 is coupled to the axle.
PLANETARY GEAR SYSTEM