PLANETARY GEAR SYSTEM
A planetary transmission system (or Epicyclic system as it is also 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 term 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 is determined by load distribution over multiple planet gears. It 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 world gears engages with sun gear #1. The second equipment step engages with sunlight gear #2. With sunlight gear 1 or 2 2 coupled to the axle,or the coupling of sun gear 1 with the ring gear, three ratio variations 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 among four output 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 installation plates & hardware for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG electric motor) — these plates are customized created for each motor to provide ideal 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 makes it easy to change gear ratios, encoders, motors, etc. without have to take apart your complete system. Another feature of the Ever-Power that means it is easy to use may be the removable shaft coupler program. This system allows you to alter 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 run a Ever-Power anywhere a CIM engine mounts.
The Ever-Power has a selection of options for installation. Each gearbox provides four 10-32 threaded holes at the top and bottom level of its housing for easy part mounting. In addition, there are also holes on leading which allow face-mounting. Easily, these holes are on a 2″ bolt circle; this is actually the same as the CIM motor – anywhere you can attach a CIM-style electric motor, you can attach a Ever-Power.
Other features include:
Six different planetary equipment stages can be used to produce 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 number 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 created from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Please grease before assembly.
received an award of distinction in the ferrous category for a planetary equipment assembly system found in a four wheel drive computer managed shifting system. The output shaft links the actuator motor to the vehicle transmitting and facilitates effortless differ from two to four wheel drive in trucks and sport utility vehicles. The other end facilitates a planetary gear program that materials torque to use the control program. The shaft result operates with 16 P/M world gears and 3 P/M gear carrier plates. The shaft is made from a proprietary high effect copper steel 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 power of 65 MPa (95,000 psi).
A manual transmission is operated by means of a clutch and a moveable stay. The driver selects the apparatus, and can generally move from any ahead equipment into another without needing to go to the next equipment in the sequence. The exception to this would be some types of race cars, which allow the driver to select only another lower or next higher gear – this is what’s known as a sequential manual transmission
In any manual transmission, there is a flywheel mounted on the crankshaft, and it spins along with the crankshaft. Between your flywheel and the pressure plate is a clutch disk. The function of the pressure plate is usually to hold the clutch disk against the flywheel. When the clutch pedal is up, the flywheel causes the clutch plate to spin. When the clutch pedal can be down, the pressure plate no more works 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 tranny is characterized by selectable gear ratios – this means that selected equipment pairs could be locked to the result shaft that’s in the transmission. That’s what we imply 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 foundation of your automatic transmission is what is referred to 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 arranged has three parts. The guts gear may be the sun. Small gears that rotate around sunlight are referred to 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 initial gear set’s planet carrier is connected to the ring of the second gear set. Both sets are linked by an axle which delivers power to the wheels. If one section of the planetary equipment is locked, others continue to rotate. This means that gear adjustments are easy and easy.
The typical automatic gearbox has two planetary gears, with three forward gears and one invert. 30 years ago, cars acquired an overdrive gearbox in addition to the main gearbox, to reduce the engine RPM and “stretch” the high gear with the thought of achieving fuel economic climate during highway generating. This overdrive used an individual planetary. The issue was that actually increased RPM rather than reducing it. Today, automatic transmissions have absorbed the overdrive, and the configuration is now three planetaries – two for regular procedure and one to become overdrive, yielding four ahead gears.
Some vehicles now actually squeeze out five gears using three planetaries. This type of 5-speed or 6-speed gearbox is becoming increasingly common.
This is by no means a thorough discussion of main gears and planetary gears. If you would like to find out more about how your car transmission works, presently 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 program is a critical component in speed reduced amount of gear system. It consists of a ring gear, set of planetary gears, a sun equipment and a carrier. It is mainly used in high speed decrease transmission. More rate variation may be accomplished using this system with same number of gears. This rate reduction is based on the number of tooth in each gear. The size of new system is compact. A theoretical calculation is conducted at idea level to get the desired reduction of speed. Then your planetary gear program can be simulated using ANSYS software for new development transmission system. The final validation is done with the screening of physical parts. This idea is implemented in 9speed transmission system. Similar concept is in development for the hub decrease with planetary gears. The maximum 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 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 always operate under dynamic circumstances 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 these failure modes, gear tooth crack at the tooth root due to tooth bending exhaustion or excessive load can be investigated; how it influences the powerful top features of planetary equipment 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 process, the mesh stiffness of gear pairs in mesh is usually obtained and incorporated into a planetary gear dynamic model to investigate the consequences of the tooth root crack on the planetary equipment powerful responses. Tooth root cracks on sunlight 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 powerful responses of the planetary equipment system is performed with time and frequency domains, respectively. Moreover, the variations in the dynamic features of the planetary equipment between the situations that tooth root crack on sunlight gear and on earth gear are found.
Advantages of using planetary gear motors in your projects
There are various types of geared motors that can be utilized in search for an ideal movement within an engineering project. Considering the technical specifications, the required performance or space limitations of our style, you should ask yourself to use one or the additional. In this post we will delve on the planetary equipment motors or epicyclical gear, which means you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear products are seen as a having gears whose disposition is very not the same as other models like 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 bigger 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 ring: an outer band (with teeth on its inner side) meshes with the satellites possesses the whole epicyclical train. Furthermore, the core can also become a center of rotation for the external ring, and can easily change directions.
For accuracy and reliability, many automated 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 easily adaptable to an infinite number of spaces, ensuring a big reduction in an extremely contained space.
Regularly this type of drives can be used in applications that require higher levels of precision. For example: Industrial automation devices, vending machines or robotics.
What are the primary 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 transmission and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability increases 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 Planetary Gear System improve this feature, your bearings help reduce the losses that could take place by rubbing the shaft on the container 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 kind of drive mechanisms are those that provide greater efficiency.
Increased torque transmission: With more teeth connected, 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 may be installed in nearly every space.
Planetary gear program is a kind 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, world carrier, and ring gear in China.
We employ the most advanced equipment and technology in manufacturing our gear models. Our inspection procedures comprise examination of the torque and materials for plastic, sintered metallic, and metal planetary gears. You can expect various assembly designs for your gear reduction projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct equipment selected in gear 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 together at the same speed. The stepped planet 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 band 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 gear 1 is definitely coupled to the axle, the initial gear stage of the stepped planet gears rolls off between the fixed sun gear 1, and the rotating ring gear. One rotation of the ring gear (green arrow) results in 0.682 rotations of the planet 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 romantic relationship can be hereby reversed from gear assy #1. The planet carrier (reddish colored arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the band gear (green arrow) when sunlight equipment #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 gear #2 is coupled to the axle, the stepped planetary gears are forced to rotate around the fixed sun gear on the second gear step. The first gear step rolls in to the ring gear. One complete rotation of the ring gear (green arrow) results 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 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 can be transferred via the band gear. The rotational romantic relationship is usually hereby reversed, as opposed to gear assy #1. The planet carrier (green arrow) rotates 0.774 of a complete rotation, resulting in one full rotation of the ring equipment (red arrow), when sun gear #2 is coupled to the axle.
PLANETARY GEAR SYSTEM