Planetary Gearbox

planetary gears also refer since epicyclic gearing consisting 3 elements sun gear, planet equipment 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 development sun and planet gears are externally mesh and ring gear internally meshes.
Planetary gear is situated in many variation and arrangements to meet a broad selection of speed-ratio in the deign requirements. Planetary equipment system is make use of in varies applications such as for example, clocks, lunar calendar, car mirror, toys, gearhead motor, turbine engine and much more.
For details understanding on the planetary
Planetary gear system will simply no assemble unless the number of teeth in each equipment is selected properly.
Planetary spur equipment drive ratio 5:1 means the sun equipment must make 5 revolutions for every revolution of the result carrier.
Desired number of teeth in the sun gear is 24.
Design requirements:
Ratio = 5:1
Sun gear = 24
Module = 1
Since, I am working in the metric device every dimension will be in mm. Selecting gears in metric device the gear tooth profile of the spur equipment 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 sunlight gear is 24.
Calculate the quantity if teeth required in the ring equipment 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 tooth and 1 module is.
Pd=Nr/M Eq. 03 Pd=96/1=96mm
Pitch diameter of the planet gears must be found from.
PDp=(Nr-PDs)/2=(96-24)/2=72/2=36mm
Number of the teeth in this world 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.
Advantages of using planetary gear motors in your projects
There are numerous types of geared motors that can be used in search for the perfect movement within an engineering project. Taking into account the technical specs, the required performance or space restrictions of our design, you should ask yourself to use one or the other. In this post we will delve on the planetary gear motors or epicyclical equipment, and that means you will know thoroughly what its advantages are and discover some successful applications.
The planetary gear devices are characterized by having gears whose disposition is very different from other models like 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 upon its inner side) meshes with the satellites possesses the whole epicyclical train. Furthermore, the core can also become a center of rotation for the outer 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 provides great versatility and can be utilized in completely different applications. Its cylindrical shape is easily adaptable to an infinite number of areas, ensuring a sizable reduction in a very contained space.
Regularly this type of drives can be used in applications that want higher degrees of precision. For example: Industrial automation devices, vending machines or robotics.
What are the primary benefits of planetary gear motors?
Increased repeatability: Its higher speed radial and axial load offers reliability and robustness, minimizing the misalignment of the apparatus. In addition, uniform tranny and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability enhances the accuracy and reliability of the movement.
Lower noise level because there is more surface area contact. Rolling is much softer and jumps are virtually nonexistent.
Greater durability: Due to its torsional rigidity and better rolling. To boost this feature, your bearings lessen the losses that would take place by rubbing the shaft on the box directly. Thus, greater efficiency of the apparatus and a much smoother operation is achieved.
Very good levels of efficiency: Planetary reducers provide greater efficiency and thanks to its design and internal layout losses are minimized during their work. Actually, today, this kind of drive mechanisms are those that offer greater efficiency.
Improved torque transmission: With more teeth in contact, the mechanism can transmit and withstand more torque. In addition, it can it in a more uniform manner.
Maximum versatility: The mechanism is contained in a cylindrical gearbox, which can be installed in nearly every space.
The construction of the planetary reducer lends itself to many advantages, for instance:
Planetary reducers give you high torque in a concise package; sharing the strain between several planet gears allows the reducer to take care of the same torque that larger parallel axis gear pieces handle.
They are highly efficient with an individual stage typically 95% efficient.
These reducers provide for ratios as high as 11:1 to be achieved within a stage, whereas, it is tough to achieve much higher than 5:1 in one parallel axis stage.
Since the sun gear contacts multiple world gears, resistance to elastic deformation, is higher in a planetary gear set than parallel axis gear set, giving the planetary reducer high torsional stiffness.
They enable coaxial alignment, meaning no offset output shaft in relation to the motor shaft.
The output shaft on Planetary reducers rotates in the same direction as the electric motor without needing an idler equipment, since in a parallel axis equipment set.
Planetary reducers are well suited for intermittent duty applications but also can be used in constant duty applications.
Finally, Ever-Power planetary’s possess an integrated housing, meaning the ring gear is integrated into the outer housing for the gearbox, increasing the robusticity.
Compared to the benefits of the planetary reducers, the drawbacks are minimal for some applications for example:
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 necessary.
Specific amounts 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 must be co-axially aligned with the motor.
Product Overview
Product Usage:
All Ever-Power gearboxes require grease for proper operation and extended life. We suggest using our crimson tacky grease, am-2768. We also encourage that an individual powers the gearbox continuously for thirty minutes without grease to permit the apparatus teeth to wear in. While we perform design with short run situations in mind, this ‘run in’ period for smooth gearbox operation, is recommended. Once this is completed, thorough grease of the apparatus teeth periodically to ensure smooth operation.
Single speed planetary gearbox, with the same mounting and output interface as a 2.5″ CIM motor. Each planet gear has its bearing to spin freely on the carrier plate pins. A 2.5″ CIM Motor could also be used as the motor input, but requires this pinion gear ( am-0556) and a CIM Spacer (am-0555).
Motor Input:
9015 motor fits upon this gearbox
550 motor fits on this gearbox
2.5″ CIM Motor can be installed, with a bored-out sun gear and a spacer
Included Hardware:
Two – 8mm id ball bearings, (19mm od, 22mm od) supporting output shaft
One – Steel planet and sun gears, 32 dp, 20 level p.a.
Five – Planet gears (12 tooth)
One – 15 tooth sunlight equipment, with 0.125 inch bore
One – 40 tooth band 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 equipment onto the motor shaft.
Specifications
Material: body is certainly 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 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 advantage of a planetary transmission depends upon load distribution over multiple planet gears. It really is thereby feasible to transfer high torques employing 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 planet gears engages with sunlight gear #1. The next gear step engages with sunlight gear #2. With sunlight gear one or two 2 coupled to the axle,or the coupling of sun gear 1 with the band gear, three ratio variations are achievable with each gear assembly.
The decision between helical and spur gears in gearboxes may seem straightforward. Move with helical gears if you want the gearbox to run as efficiently and quietly as feasible. Choose spur gears if you want to maximize the gearbox’s torque density or functioning existence under higher loads.
These guidelines are mostly what you should know when specifying traditional fixed-axis gearboxes. Simply size the gearbox correctly, and the decision between helical and spur gears will often be obvious for a given 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 might expect from their different mesh geometries, spur and helical gears have completely different loading characteristics. With their zero helix position, spur gears lack an axial load element. And they suffer from very little sliding tooth contact.
Helical gears, by contrast, generate significant axial forces in the gear mesh. In addition they exhibit more sliding at the point of tooth get in touch with, adding friction forces into the mix.
Helix angles in gearboxes usually fall in a range of 15 to 30 degrees. As the angle increases, both axial forces and sliding contact increase.
The main reason for using helical gears is the increased number of teeth connected at any given time, which is a fundamental requirement for smooth torque transmission. With their
increased contact ratio in comparison to spur gears, helical gears have a lower fluctuation
of the apparatus mesh stiffness.
Helical Gears Place Better Demand on Bearings
Since they don’t need to withstand any axial forces, spur gear bearings enjoy just a supporting role in the functioning of the gearbox. The bearings should just support the rotating gear shafts, however they do not play an active role in torque transfer.
The presence 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 a hassle. Gearbox designers will most likely upsize the bearings to support the additional forces.
Or, in extreme cases, they may select angular contact or tapered roller bearings, both which are created to withstand axial loads.
Space limitations within planetary gearboxes mean that the planet gear bearings should be chosen more because of their size than their tolerance for high axial loads.
In planetary gearboxes, however, it’s much more difficult to create around these axial forces for two related reasons. Initial, there is typically hardly any space in a planetary gearbox to include the type of bulky bearings that may tolerate high axial forces.
Second, the earth gear bearings need to play an active role in torque transfer. Planetary systems split the torque input from sunlight gear amongst the planet gears, which in turn transfer torque to a planet carrier linked to the gearbox result. The bearings that support the planets on the carrier have to bear the entire brunt of that torque transfer.
And Here Is the Difficulty
The limited space within planetary gearboxes implies that the bearings used for the planet gears must be chosen more because of their size than their tolerance for high axial loads. In general, compact needle roller bearings are the most typical choice in these configurations.
Needle roller bearings do a good work with radial loads that are evenly distributed along the space of the needle. But they don’t manage 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-ring gear mesh. So the world sees significant tilting moment described by the axial pressure times gear pitch diameter. This tilting minute creates an uneven load distribution along the needle rollers, significantly decreasing the bearings’ load having capability and lifecycle.
Loads on the roller bearings will change, depending on their position around the shaft. Second is about the Z-axis, and systems are in in . and pounds.
The Planetary Motion Is The Theory For The Planetary Gearbox.
The Accurately Positioned And Meshed World Gears (3) With The Sun Gear AT THE HEART And The Internal Teeth Of The Outer Band Gear Compose Each Stage Of A Planetary Gearbox.
The Sun Gear Gets The Input AS THE 3 Planet Gears Provide The Ouput WITH A Planet Carrier .
The Torque Handling Capacity Is Very High Because Of Its Flexibility , And A Very High Weight /Volume Ratio , Thus It Lends Its Application IN A VARIETY OF Industries – Specifically In High Torque Requirements RENDERING IT The Most Economical Alternative.
Being A Proud Provider Of Planetary Gearbox, WE OFFER An Excellent Distinguished Service TO YOUR Clientile.
Planetary Gearbox Product Specs :
Provides High Torque At Slow Speeds.
Our Range Of Gearboxes And Geared Motors Are Manufactured As Per The American Gear Producers Association (AGMA) Standards.
The Shafts ARE MADE Of Hardened And Tempered Particular Alloy Steel.
Sun And World Gears Are Made Of Case Carburised And Floor Alloy Steel.
Ring Gears Are Made Up Of Forged Alloy Steel.
Best Load Sharing DUE TO Accurate Positioning Of Planets.
Low Noise Levels.
No Oil Leakage.
TOP QUALITY Taper Roller Bearings For Input And Output Shafts.
Very High Efficiency