planetary gear system

PLANETARY GEAR SYSTEM
A planetary transmission program (or Epicyclic system since it can be known), consists normally of a centrally pivoted sunlight gear, a ring equipment and several planet gears which rotate between these.
This assembly concept explains the word 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 depends upon load distribution over multiple planet gears. It is thereby feasible 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 next equipment step engages with sunlight gear #2. With sun gear one or two 2 coupled to the axle,or the coupling of sunlight gear 1 with the band gear, three ratio variations are achievable with each equipment assembly.
The Ever-Power is a battle-tested modular planetary gearbox system designed particularly for use in the Robotics marketplace. Designers choose among four output shafts, configure a single-stage planetary using among six different reductions, or create a multi-stage gearbox using any of the different ratio combinations.
All the Ever-Power gearboxes include installation plates & hardware for typical Robotics Competition motors (550, 775 Series, 9015 size motors, and the VEXpro BAG engine) — these plates are custom made for each motor to supply ideal piloting and high performance.
What great 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 rear of the gearbox. This makes it easy to change equipment 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 may be the removable shaft coupler system. This system enables you to change motors without the need to buy a particular 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 variety of options for installation. Each gearbox provides four 10-32 threaded holes at the top and bottom level of its housing 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 electric motor – anywhere you can mount a CIM-style electric motor, you can install a Ever-Power.
Other features include:
Six different planetary equipment stages can be utilized to develop up to 72 unique gear ratios, the most of any COTS gearbox in FRC or FTC.
Adapts to a variety 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 Electric motor, Tetrix TorqueNADO)
ABEC-1/ISO 492 Class Regular Bearings, rated for 20,000+ RPM
AGMA-11 quality planet and sun gears made 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 gear assembly system used in a four wheel drive computer controlled shifting system. The result shaft links the actuator electric motor to the vehicle tranny and facilitates effortless change from two to four wheel drive in trucks and sport utility vehicles. The other end supports a planetary gear system that supplies torque to use the control program. 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 influence copper steel to a density of 7.7 grams/cc. It has an unnotched Charpy influence strength above 136J (110 ft-lbs), elongation greater than 8% and a tensile power of 65 MPa (95,000 psi).
Manual transmission
A manual tranny is operated by means of a clutch and a moveable stick. The driver selects the apparatus, and can usually move from any forward equipment into another without having to go to 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 – that is what’s known as a sequential manual transmission
In virtually any manual transmission, there exists a flywheel attached to the crankshaft, and it spins along with the crankshaft. Between the flywheel and the pressure plate is certainly a clutch disk. The function of the pressure plate is usually to hold 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 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 seen as a selectable equipment ratios – this implies that selected equipment pairs can be locked to the result shaft that’s inside the tranny. That’s what we indicate when we utilize the term “primary gears.” An automatic transmission, on the other hand, uses planetary gears, which work quite differently.
Planetary gears and the automatic transmission
The basis of your automatic transmission is what’s known as a planetary, or epicycloidal, gear set. This is exactly what enables you to change your vehicle gear ratio without having to engage or disengage a clutch.
A planetary gear set has three parts. The center gear may be 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 questioning how planetary gears got the name, now you understand!
In the gearbox, the first gear set’s planet carrier is connected to the band of the second gear set. Both sets are linked by an axle which delivers power to the wheels. If one section of the planetary gear is locked, the others continue steadily to rotate. This means that gear changes are easy and easy.
The typical automated gearbox has two planetary gears, with three forward gears and one invert. 30 years ago, vehicles experienced an overdrive gearbox furthermore to the primary gearbox, to lessen the engine RPM and “stretch” the high equipment with the idea of achieving fuel economy during highway generating. This overdrive used an individual planetary. The issue was that this actually increased RPM rather than reducing it. Today, automated transmissions possess absorbed the overdrive, and the configuration is now three planetaries – two for regular procedure and one to act as overdrive, yielding four forwards gears.
The future
Some vehicles now actually squeeze away five gears using three planetaries. This kind of 5-acceleration or 6-swiftness gearbox is becoming increasingly common.
This is by no means a comprehensive discussion of main 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 may deliver information that’s just as complex as you want it to be.
The planetary gear program is a crucial component in speed reduced amount of gear program. It includes a ring gear, group of planetary gears, a sunlight equipment and a carrier. It is mainly utilized in high speed reduction transmission. More velocity variation may be accomplished using this technique with same number of gears. This swiftness 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 reduced amount of speed. Then your planetary gear program is simulated using ANSYS software program for new development transmitting system. The final validation is performed with the testing of physical parts. This idea is implemented in 9speed transmission system. Comparable concept is in advancement for the hub decrease with planetary gears. The maximum 3.67 decrease is achieved with planetary program. The stresses in each pin is calculated using FEA.
Planetary gears are widely used in the industry because of their benefits of compactness, high power-to-weight ratios, high efficiency, and so on. However, planetary gears such as that in wind mill transmissions generally operate under dynamic circumstances with internal and exterior load fluctuations, which accelerate the occurrence of equipment failures, such as tooth crack, pitting, spalling, put on, scoring, scuffing, etc. As you of these failure modes, equipment tooth crack at the tooth root because of tooth bending exhaustion or excessive load can be investigated; how it influences the powerful top 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 equipment pairs in mesh is obtained and incorporated right into a planetary equipment dynamic model to research the effects 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 gear system is performed with time and frequency domains, respectively. Moreover, the variations in the dynamic top features of the planetary gear between the situations that tooth root crack on sunlight gear and on earth gear are found.
Benefits of using planetary equipment motors in your projects
There are many types of geared motors that can be used in search for the perfect movement in an engineering project. Considering the technical specs, the mandatory performance or space limitations of our design, you should ask yourself to make use of one or the additional. In this article we will delve on the planetary gear motors or epicyclical gear, so you will know completely what its advantages are and find out some successful applications.
The planetary gear devices are characterized by 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 equipment. It has a bigger 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 band (with teeth on its inner side) meshes with the satellites possesses the whole epicyclical train. Furthermore, the core may also become a center of rotation for the outer ring, and can easily change directions.
For accuracy and reliability, many automatic transmissions currently use planetary gear motors. If we discuss sectors this reducer offers great versatility and can be used in very different applications. Its cylindrical shape is quickly adaptable to thousands of spaces, ensuring a huge reduction in an extremely contained space.
Regularly this type of drives can be utilized in applications that require higher degrees of precision. For instance: Industrial automation machines, vending machines or robotics.
What are the main benefits of planetary gear motors?
Increased repeatability: Its greater 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 boosts 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: Because of its torsional rigidity and better rolling. To boost this feature, your bearings lessen the losses that could happen by rubbing the shaft on the container directly. Thus, greater efficiency of the apparatus and a much smoother procedure 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. In fact, today, this type of drive mechanisms are those that offer greater efficiency.
Increased torque transmission: With an increase of teeth in contact, the mechanism can transmit and endure more torque. Furthermore, it does it in a more uniform manner.
Maximum versatility: Its mechanism is contained in a cylindrical gearbox, which may be installed in nearly every space.
Planetary gear program is a kind of epicyclic gear system used in precise and high-effectiveness transmissions. We have vast experience in manufacturing planetary gearbox and equipment 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 pieces. Our inspection procedures comprise examination of the torque and materials for plastic, sintered metallic, and steel planetary gears. We offer various assembly styles for your gear reduction projects.
Direct Gear 1:1
Example Gear Assy (1) and (2)
With direct gear selected in gear assy (1) or (2), sunlight gear 1 is in conjunction with the ring equipment in gear assy (1) or gear assy (2) respectively. The sun gear 1 and band gear then rotate collectively at the same acceleration. The stepped world gears do not unroll. Therefore the apparatus ratio is 1:1.
Gear assy (3) aquires direct gear predicated on the same principle. Sunlight gear 3 and ring gear 3 are directly 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 certainly coupled to the axle, the initial gear step of the stepped world gears rolls off between the fixed sun gear 1, and the rotating band equipment. One rotation of the band gear (green arrow) outcomes 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 planet carrier and the output is transferred via the ring gear. The rotational relationship is usually hereby reversed from equipment assy #1. The earth carrier (reddish colored arrow) rotates 0.682 of a complete rotation leading to one full rotation of the ring gear (green arrow) when sun 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 equipment #2 is definitely coupled to the axle, the stepped planetary gears are pressured to rotate around the set sun gear on the second gear step. The first equipment step rolls into the ring gear. One complete rotation of the band gear (green arrow) results in 0.774 rotations of the earth carrier (red arrow). Sun equipment #1 is carried forward 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 earth carrier. The output is certainly transferred via the band gear. The rotational relationship can be hereby reversed, instead of gear assy #1. The planet carrier (green arrow) rotates 0.774 of a complete rotation, leading to one full rotation of the ring equipment (red arrow), when sun equipment #2 is coupled to the axle.