Planetary Gearbox

planetary gears also refer since epicyclic gearing consisting three components sun gear, planet gear and ring gear. Sunlight gear is situated at the center that transmits torque to world gears orbiting around the sun gear. Both systems are located inside the ring gear. In the toothed formation sun and planet gears are externally mesh and ring gear internally meshes.
Planetary gear is situated in many variation and arrangements to meet up a broad range of speed-ratio in the deign requirements. Planetary equipment system is use in varies applications such as, clocks, lunar calendar, car mirror, toys, gearhead engine, turbine engine and many more.
For details understanding on the planetary
Planetary gear system will simply no assemble unless the amount of teeth in each gear is selected properly.
Planetary spur gear drive ratio 5:1 means sunlight gear must make 5 revolutions for each revolution of the result carrier.
Desired number of teeth in sunlight gear is 24.
Design requirements:
Ratio = 5:1
Sun gear = 24
Module = 1
Since, I am working in the metric unit every dimension will be in mm. Choosing gears in metric unit the apparatus tooth profile of the spur gear will be in Module.
M = Module
N = Number of teeth
Nr = Number of teeth on the ring gear
Pd= Pitch Diameter
R = Ratio
PDs=N/M=24/1=24mm Eq. 01
Pitch diameter of the sun gear is 24.
Calculate the number if teeth needed in the ring gear for the ratio 5:1.
R=1+Nr/Pd Eq. 02
Solve for Nr
Nr=Pd (R-1)=24(5-1)=24(4)=96 teeth
Pitch diameter of the ring gear with 96 teeth and 1 module is.
Pd=Nr/M Eq. 03 Pd=96/1=96mm
Pitch diameter of the earth gears should be found from.
PDp=(Nr-PDs)/2=(96-24)/2=72/2=36mm
Number of the teeth in the planet gears may now end up being found from.
PDp=N/M Eq. 04 36mm=N/1 è 36mm (1)=N è N =36 teeth
Check:
R=1+Nr/P_D =1+96/24=1+4=5
The ratio is 5:1, as design was required.
Benefits of using planetary equipment motors in your projects
There are numerous types of geared motors that can be used in search for an ideal movement within an engineering project. Taking into account the technical specifications, the required performance or space restrictions of our design, you should ask yourself to make use of one or the 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 find out some successful applications.
The planetary gear products 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 gear. 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 sunlight gear.
Crown or ring: an outer ring (with teeth on its inner aspect) meshes with the satellites possesses the complete epicyclical train. Furthermore, the core may also become a middle of rotation for the external ring, allowing it to easily change directions.
For accuracy and reliability, many automatic transmissions currently use planetary equipment motors. If we talk about sectors this reducer offers great versatility and can be utilized in very different applications. Its cylindrical shape is quickly adaptable to an infinite number of areas, ensuring a big reduction in a very contained space.
Regularly this kind of drives can be used in applications that want higher degrees of precision. For instance: Industrial automation devices, vending machines or robotics.
What are the primary 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 transmission and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability improves the accuracy and reliability of the motion.
Lower noise level because there is more surface area contact. Rolling is a lot softer and jumps are virtually nonexistent.
Greater durability: Due to its torsional rigidity and better rolling. To boost this feature, your bearings help reduce the losses that would happen by rubbing the shaft on the box directly. Thus, greater performance of the apparatus and a much smoother procedure is achieved.
Very good degrees of efficiency: Planetary reducers offer greater efficiency and thanks to its design and internal layout losses are minimized throughout their work. Actually, today, this type of drive mechanisms are those that provide greater efficiency.
Improved torque transmission: With an increase of teeth connected, the mechanism is able 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 almost any space.
The construction of the planetary reducer lends itself to numerous advantages, for instance:
Planetary reducers give you high torque in a compact package; sharing the strain between several planet gears allows the reducer to take care of the same torque that bigger parallel axis gear sets handle.
They are highly efficient with a single stage typically 95% efficient.
These reducers provide for ratios as high as 11:1 to be achieved in one stage, whereas, it really is hard to achieve higher than 5:1 in a single parallel axis stage.
Because the sun gear contacts multiple planet gears, level of resistance to elastic deformation, is higher in a planetary gear set than parallel axis gear set, giving the planetary reducer high torsional stiffness.
They allow for coaxial alignment, meaning no offset result shaft in relation to the motor shaft.
The output shaft on Planetary reducers rotates in the same direction as the engine without needing an idler gear, because in a parallel axis equipment set.
Planetary reducers are ideal for intermittent duty applications but also can be used in continuous duty applications.
Finally, Ever-Power planetary’s have a built-in housing, meaning the ring gear is built-into the outer housing for the gearbox, adding to the robusticity.
Compared to the advantages of the planetary reducers, the disadvantages are minimal for some applications for instance:
High ratio of length to diameter when working with multiple stages (gearhead can get very long).
Potentially high cost if low backlash, high precision gearing is required.
Specific numbers of gear teeth are required equally spaced planets (simple assembly) and noise mitigation.
The apparatus ratio determines how many planet gears may be used.
You should look at planetary reducers when making for applications requiring high torques in a small package with an output shaft needs to be co-axially aligned with the electric motor.
Product Overview
Product Usage:
All Ever-Power gearboxes require grease for proper operation and extended life. We recommend using our reddish colored tacky grease, am-2768. We also encourage that an individual powers the gearbox constantly for 30 minutes without grease to permit the gear teeth to put on in. While we do design with short run situations at heart, this ‘run in’ period for smooth gearbox operation, is recommended. Once that is completed, comprehensive grease of the gear teeth periodically to make sure smooth operation.
Single speed planetary gearbox, with the same installation and output interface as a 2.5″ CIM motor. Each planet gear has its own bearing to spin freely on the carrier plate pins. A 2.5″ CIM Motor may also be used as the motor input, but requires this pinion equipment ( am-0556) and a CIM Spacer (am-0555).
Motor Input:
9015 motor fits on this gearbox
550 motor fits on this gearbox
2.5″ CIM Motor could be mounted, with a bored-out sun equipment and a spacer
Included Hardware:
Two – 8mm id ball bearings, (19mm od, 22mm od) supporting output shaft
One – Steel world and sun gears, 32 dp, 20 level p.a.
Five – Planet gears (12 tooth)
One – 15 tooth sunlight gear, with 0.125 inch bore
One – 40 tooth ring gear
Performance Data:
(with the insight being truly a 9015 motor)
Input voltage: 12 volts
Stall Torque: 1.12 ft-lb.
Free speed: approximately 4,000 rpm
Assembly Tip:
Install the light weight aluminum plate to the face of the motor Just before pressing the pinion gear onto the electric motor shaft.
Specifications
Material: body is usually aluminum, shaft is 4140 steel
Mounting Holes: #10-32 tapped holes (2), upon a 2″ bolt circle to add at output shaft
Outside dimension: 2.5 in.
Ratio: 3.67:1
Shaft Diameter: 0.313 inch,with 2mm keyway
Weight: 0.63 lbs
PLANETARY GEAR SYSTEM
A planetary transmission program (or Epicyclic system as 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 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 really is thereby possible to transfer high torques utilizing a compact design.
Gear assembly 1 and gear assembly 2 of the Ever-Power 500/14 have two selectable sunlight gears. The first gear stage 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 sunlight gear 1 with the ring gear, three ratio variations are achievable with each equipment assembly.
The choice between helical and spur gears in gearboxes may appear straightforward. Go with helical gears if you want the gearbox to run as efficiently and quietly as possible. Choose spur gears when you need to increase the gearbox’s torque density or operating existence under higher loads.
These rules of thumb are mainly what you should know when specifying traditional fixed-axis gearboxes. Simply size the gearbox properly, and the decision between helical and spur gears may also be obvious for confirmed set of application requirements. With planetary gearboxes, however, the choice between helical and spur gears requires some additional thought.
Helical Gears Create Axial Forces
As you may expect from their different mesh geometries, spur and helical gears have completely different loading characteristics. With their zero helix angle, spur gears lack an axial load element. And they suffer from very little sliding tooth contact.
Helical gears, in comparison, generate significant axial forces in the gear mesh. They also exhibit more sliding at the idea of tooth contact, adding friction forces in to the mix.
Helix angles in gearboxes usually fall in a variety of 15 to 30 degrees. As the position increases, both axial forces and sliding contact increase.
The main reason for using helical gears is the increased number of teeth in contact at any given time, which is a fundamental requirement of smooth torque transmission. With their
increased contact ratio in comparison to spur gears, helical gears have got a lower fluctuation
of the apparatus mesh stiffness.
Helical Gears Place Greater Demand on Bearings
Since they don’t need to withstand any axial forces, spur gear bearings play just a supporting function in the functioning of the gearbox. The bearings should just support the rotating equipment shafts, however they do not really play an active part in torque transfer.
The existence of axial forces makes things very different for the bearings that support helical gears. But it is critical to make a distinction between fixed-axis and planetary gearboxes. In fixed-axis gearboxes, the excess axial forces amount to little more than an inconvenience. Gearbox designers will most likely upsize the bearings to accommodate the additional forces.
Or, in extreme cases, they could select angular contact or tapered roller bearings, both which are made to withstand axial loads.
Space limitations within planetary gearboxes imply that the planet gear bearings should be chosen more for his or her size than their tolerance for high axial loads.
In planetary gearboxes, however, it’s a lot more difficult to create around these axial forces for two related reasons. Initial, there is typically very little room in a planetary gearbox to include the kind of bulky bearings that may tolerate high axial forces.
Second, the earth gear bearings need to play an active function in torque transfer. Planetary systems split the torque input from sunlight gear amongst the earth gears, which in turn transfer torque to a planet carrier linked to the gearbox output. The bearings that support the planets on the carrier have to bear the full brunt of that torque transfer.
And This is actually the Difficulty
The limited space within planetary gearboxes implies that the bearings used for the earth gears should be chosen more for their size than their tolerance for high axial loads. In general, small needle roller bearings are the most typical choice in these settings.
Needle roller bearings execute a good work with radial loads that are evenly distributed along the distance of the needle. However they don’t handle axial loads well.
In planetary systems, the direction of the axial force in the sun-planet mesh opposes that of the force in the planet-band gear mesh. So the world sees significant tilting instant defined by the axial drive times equipment pitch diameter. This tilting instant produces an uneven load distribution along the needle rollers, significantly lowering the bearings’ load carrying capability and lifecycle.
Loads on the roller bearings will change, depending on their position around the shaft. Second is approximately the Z-axis, and units are in inches and pounds.
The Planetary Motion Is The Principle For The Planetary Gearbox.
The Accurately Positioned And Meshed Planet Gears (3) With SUNLIGHT Gear In The Centre And THE INNER Teeth Of The Outer Ring Gear Compose Each Stage Of A Planetary Gearbox.
The Sun Equipment Gets The Input While The 3 Planet Gears SUPPLY THE Ouput Via A Planet Carrier .
The Torque Handling Capability Is Very High DUE TO ITS Flexibility , And A Very High Weight /Volume Ratio , Thus It Lends Its Software In Various Industries – Specifically In High Torque Requirements Making It The Most Economical Remedy.
Being A Proud Provider Of Planetary Gearbox, We Provide An Excellent Distinguished Service To Our Clientile.
Planetary Gearbox Product Specifications :
Provides High Torque In Slow Speeds.
Our SELECTION OF Gearboxes And Geared Motors Are Manufactured As Per The American Gear Manufacturers Association (AGMA) Standards.
The Shafts Are Made Up Of Hardened And Tempered Special Alloy Steel.
Sun And World Gears ARE CONSTRUCTED WITH Case Carburised And Floor Alloy Steel.
Ring Gears Are Made Up Of Forged Alloy Steel.
Best Load Sharing Because Of Accurate Positioning Of Planets.
Low Noise Levels.
No Oil Leakage.
Good Quality Taper Roller Bearings For Input And Output Shafts.
Very High Efficiency