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 equipment and several world gears which rotate between these.
This assembly concept explains the term planetary transmission, as the earth gears rotate around sunlight 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 equipment assembly 2 of the Ever-Power SPEEDHUB 500/14 have two selectable sun gears. The first gear step of the stepped world gears engages with sun gear #1. The second equipment 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 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 one of six different reductions, or build a multi-stage gearbox using some of the various ratio combinations.
All the Ever-Power gearboxes include installation plates & equipment for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG motor) — these plates are custom made for each motor to provide ideal piloting and high performance.
What good is a versatile system if it’s not simple 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 equipment 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 program. This system allows you to modify 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 engine mounts.
The Ever-Power includes a selection of options for mounting. Each gearbox provides four 10-32 threaded holes on top and bottom of its casing for easy side mounting. In addition, there are also holes on leading which allow face-mounting. Conveniently, these holes are on a 2″ bolt circle; this is actually the same as the CIM engine – anywhere you can attach a CIM-style motor, you can mount a Ever-Power.
Other features include:
Six different planetary equipment stages can be used to produce up to 72 unique gear ratios, the most 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 world and sun gears created from hardened 4140 steel
Ever-Power Gearboxes ship disassembled. Make sure you 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 managed shifting system. The output shaft links the actuator engine to the vehicle tranny and facilitates effortless change from two to four wheel drive in trucks and sport utility automobiles. The other end facilitates a planetary gear system that items torque to use the control system. The shaft output operates with 16 P/M world gears and 3 P/M gear carrier plates. The shaft is manufactured out of 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 higher than 8% and a tensile strength of 65 MPa (95,000 psi).
Manual transmission
A manual transmitting is operated by means of a clutch and a moveable stay. The driver selects the gear, and can generally move from any forwards equipment into another without having to visit the next gear 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 exists a flywheel mounted on the crankshaft, and it spins combined with the crankshaft. Between the flywheel and the pressure plate is a clutch disk. The function of the pressure plate is 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 definitely down, the pressure plate no longer 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 transmitting is characterized by selectable gear ratios – this implies that selected equipment pairs can be locked to the result shaft that’s inside the transmitting. That’s what we imply when we utilize the term “primary gears.” An automatic transmission, on the other hand, uses planetary gears, which function quite differently.
Planetary gears and the automatic transmission
The basis of your automated transmission is what is known 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 arranged has 3 parts. The guts gear is the sun. Small gears that rotate around the sun are referred to as the planets. And finally, the annulus is the ring that engages with the planets on the outer side. In the event that you were thinking how planetary gears got the name, now you know!
In the gearbox, the 1st gear set’s planet carrier is linked to the band of the next gear set. Both sets are connected by an axle which delivers power to the tires. If one area of the planetary equipment is locked, the others continue steadily to rotate. This means that gear adjustments are easy and clean.
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 idea of achieving fuel economy during highway generating. This overdrive used a single planetary. The issue was that this actually increased RPM instead of reducing it. Today, automatic transmissions have absorbed the overdrive, and the configuration is now three planetaries – two for normal procedure and one to act as overdrive, yielding four forwards gears.
The future
Some automobiles now actually squeeze out five gears using three planetaries. This type of 5-acceleration or 6-rate gearbox is becoming increasingly common.
This is in no way a thorough discussion of main gears and planetary gears. If you want to learn more about how your vehicle transmission works, presently there are countless online language resources that will deliver information that’s just as complicated as you want it to be.
The planetary gear system is a critical component in speed reduced amount of gear system. It includes a ring gear, set of planetary gears, a sunlight equipment and a carrier. It really is mainly used in high speed decrease transmission. More quickness variation may be accomplished using this system with same number of gears. This rate reduction is founded on the number of the teeth in each gear. The size of new system is compact. A theoretical calculation is performed at idea level to get the desired reduction of speed. Then your planetary gear system is simulated using ANSYS software program for new development tranny system. The ultimate validation is performed with the assessment 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 reduction is achieved with planetary system. The stresses in each pin is definitely calculated using FEA.
Planetary gears are trusted in the industry because of their benefits of compactness, high power-to-weight ratios, high efficiency, and so forth. However, planetary gears such as that in wind mill transmissions constantly operate under dynamic circumstances with internal and exterior load fluctuations, which accelerate the occurrence of gear failures, such as for example tooth crack, pitting, spalling, use, scoring, scuffing, etc. As one of these failure modes, equipment tooth crack at the tooth root due to tooth bending fatigue or excessive load can be investigated; how it influences the dynamic 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 approach, the mesh stiffness of equipment pairs in mesh is definitely obtained and incorporated right into a planetary equipment dynamic model to research the consequences of the tooth root crack on the planetary gear powerful responses. Tooth root cracks on the sun gear and on the planet 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 gear system is performed with time and frequency domains, respectively. Moreover, the differences in the dynamic top features of the planetary gear between the cases that tooth root crack on the sun gear and on earth gear are found.
Advantages of using planetary gear motors in your projects
There are many 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 restrictions of our style, you should ask yourself to make use of one or the additional. In this post we will delve on the planetary equipment motors or epicyclical equipment, which means you will know thoroughly what its advantages are and find out some successful applications.
The planetary gear devices are characterized by 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 equipment. It has a larger size and rotates on the central axis.
The planet carrier: Its objective is to carry up to 3 gears of the same size, which mesh with the sun gear.
Crown or band: an outer band (with teeth on its inner side) meshes with the satellites and contains the complete epicyclical train. In addition, the core may also become a center of rotation for the external ring, allowing it to 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 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 instance: Industrial automation devices, vending machines or robotics.
What are the main advantages of planetary gear motors?
Increased repeatability: Its greater speed radial and axial load offers reliability and robustness, minimizing the misalignment of the apparatus. In addition, uniform transmitting and low vibrations at different loads provide a perfect repeatability.
Perfect 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 lessen the losses that could occur by rubbing the shaft on the container directly. Thus, greater efficiency of the apparatus and a much smoother operation is achieved.
Very good degrees of efficiency: Planetary reducers provide greater efficiency and thanks to its design and internal layout losses are minimized during their work. Actually, today, this type of drive mechanisms are those that offer greater efficiency.
Improved torque transmission: With more teeth in contact, the mechanism is 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 system is a kind of epicyclic gear system used in precise and high-efficiency transmissions. We have vast experience in production planetary gearbox and gear components such as sun gear, world carrier, and ring gear in China.
We employ the innovative tools and technology in production our gear pieces. Our inspection processes comprise examination of the torque and components for plastic, sintered metallic, and metal planetary gears. We offer various assembly styles 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 with each other at the same velocity. The stepped planet gears do not unroll. Thus the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear based 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 gear 1 is coupled to the axle, the initial gear step of the stepped world 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 planet carrier (red arrow).
Example Gear Assembly #2
In this instance 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 (crimson arrow) rotates 0.682 of a complete rotation resulting in one full rotation of the ring equipment (green arrow) when sun 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 gear #2 is usually coupled to the axle, the stepped planetary gears are forced to rotate around the set sun gear on the second gear stage. The first gear step rolls in to the ring equipment. One complete rotation of the ring gear (green arrow) results in 0.774 rotations of the planet carrier (red arrow). Sunlight equipment #1 is carried forward without function, as it is driven on by the initial 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 ring gear. The rotational relationship is certainly 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 band equipment (red arrow), when sun gear #2 is coupled to the axle.