planetary gears also refer because epicyclic gearing consisting three elements sun gear, planet gear and ring gear. Sun gear is located at the guts that transmits torque to world gears orbiting around sunlight gear. Both systems can be found inside the ring equipment. In the toothed development sun and planet gears are externally mesh and ring gear internally meshes.
Planetary gear is found in many variation and arrangements to meet up a broad selection of speed-ratio in the deign requirements. Planetary equipment system is use in varies applications such as, clocks, lunar calendar, car mirror, toys, gearhead motor, turbine engine and much more.
For detail understanding on the planetary
Planetary gear system will no assemble unless the number of teeth in each equipment is selected properly.
Planetary spur gear drive ratio 5:1 means sunlight equipment must make 5 revolutions for each revolution of the output 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 device every dimension will be in mm. Choosing gears in metric device the gear 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 quantity if teeth required 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 band gear with 96 tooth and 1 module is.
Pd=Nr/M Eq. 03 Pd=96/1=96mm
Pitch diameter of the earth gears must be found from.
PDp=(Nr-PDs)/2=(96-24)/2=72/2=36mm
Number of tooth in the planet gears may now become 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 gear motors in your projects
There are various types of geared motors that can be utilized 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 use one or the other. In this article we will delve on the planetary gear motors or epicyclical gear, 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 equipment. It has a bigger size and rotates on the central axis.
The planet carrier: Its objective is to hold up to 3 gears of the same size, which mesh with sunlight gear.
Crown or ring: an outer ring (with teeth on its inner part) meshes with the satellites and contains the whole epicyclical train. In addition, the core can also become a middle of rotation for the external ring, and can easily change directions.
For accuracy and reliability, many automated transmissions currently use planetary equipment 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 areas, ensuring a big reduction in an extremely contained space.
Regularly this kind of drives can be utilized in applications that want higher degrees of precision. For example: Industrial automation machines, vending machines or robotics.
What are the primary 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 transmission and low vibrations at different loads give a perfect repeatability.
Ideal precision: Most rotating angular stability boosts the accuracy and reliability of the motion.
Lower noise level because there is more surface 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 box directly. Thus, greater effectiveness of the apparatus 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 offer greater efficiency.
Increased torque transmission: With an increase of teeth connected, the mechanism will be able to transmit and endure more torque. Furthermore, it does it in a far more uniform manner.
Maximum versatility: The mechanism is within a cylindrical gearbox, which may be installed in almost any space.
The construction of the planetary reducer lends itself to many 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 larger parallel axis gear units handle.
They are highly efficient with an individual stage typically 95% efficient.
These reducers give ratios as high as 11:1 to be performed in one stage, whereas, it really is tough to achieve much higher than 5:1 in one parallel axis stage.
Since the sun gear contacts multiple planet 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 allow for coaxial alignment, meaning no offset output shaft with regards to the motor shaft.
The output shaft on Planetary reducers rotates in the same direction as the motor without needing an idler equipment, because in a parallel axis equipment set.
Planetary reducers are ideal for intermittent duty applications but also can be utilized in continuous duty applications.
Finally, Ever-Power planetary’s have an integrated housing, meaning the ring gear is integrated into the external housing for the gearbox, increasing the robusticity.
Compared to the benefits of the planetary reducers, the drawbacks are minimal for some applications for instance:
High ratio of length to diameter when working with multiple stages (gearhead will get very long).
Potentially high cost if low backlash, high precision gearing is required.
Specific numbers of gear teeth are necessary equally spaced planets (simple assembly) and noise mitigation.
The apparatus ratio determines just how many planet gears may be used.
You should think about planetary reducers when designing for applications requiring high torques in a small package with an result shaft must be co-axially aligned with the motor.
Product Overview
Product Usage:
All Ever-Power gearboxes require grease for proper procedure and extended life. We suggest using our reddish tacky grease, am-2768. We also motivate that an individual powers the gearbox continually for 30 minutes without grease to permit the gear teeth to put on in. While we perform style with short run situations at heart, this ‘run in’ period for smooth gearbox procedure, is recommended. Once this is completed, comprehensive grease of the apparatus teeth periodically to make sure smooth operation.
Single speed planetary gearbox, with the same mounting and output interface as a 2.5″ CIM motor. Each planet equipment has its 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 gear ( am-0556) and a CIM Spacer (am-0555).
Motor Input:
9015 motor fits on this gearbox
550 motor fits upon this gearbox
2.5″ CIM Motor can be mounted, 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 gear, with 0.125 inch bore
One – 40 tooth ring gear
Performance Data:
(with the insight being a 9015 motor)
Input voltage: 12 volts
Stall Torque: 1.12 ft-lb.
Free speed: approximately 4,000 rpm
Assembly Tip:
Install the aluminium plate to the facial skin of the motor Prior to pressing the pinion gear onto the motor shaft.
Specifications
Material: body is aluminum, shaft is 4140 steel
Mounting Holes: #10-32 tapped holes (2), on a 2″ bolt circle to attach at output shaft
Outdoors 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 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 term 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 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 sun gears. The first gear step of the stepped planet gears engages with sunlight gear #1. The second equipment step engages with sunlight gear #2. With sun gear 1 or 2 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 decision between helical and spur gears in gearboxes may seem straightforward. Go with helical gears if you want the gearbox to run as efficiently and quietly as possible. Choose spur gears if you want to maximize the gearbox’s torque density or operating existence under higher loads.
These rules of thumb are mainly what you need to know when specifying traditional fixed-axis gearboxes. Just size the gearbox properly, and the decision between helical and spur gears may also be obvious for a given set of application requirements. With planetary gearboxes, however, the decision between helical and spur gears requires some extra thought.
Helical Gears Create Axial Forces
As you might expect from their different mesh geometries, spur and helical gears have very different loading features. With their zero helix position, spur gears absence an axial load component. And they suffer from very little sliding tooth contact.
Helical gears, by contrast, generate significant axial forces in the gear mesh. They also exhibit more sliding at the point of tooth contact, adding friction forces in to the mix.
Helix angles in gearboxes usually fall in a range of 15 to 30 degrees. As the angle increases, both the 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 really is a fundamental requirement of smooth torque transmission. With their
increased contact ratio compared to spur gears, helical gears have a lower fluctuation
of the apparatus mesh stiffness.
Helical Gears Place Higher Demand on Bearings
Since they don’t need to withstand any axial forces, spur gear bearings perform just a supporting part in the functioning of the gearbox. The bearings simply need to support the rotating gear shafts, but they do not play an active part in torque transfer.
The existence of axial forces makes things completely 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 total little more than a hassle. Gearbox designers will often upsize the bearings to support the additional forces.
Or, in extreme cases, they may select angular contact or tapered roller bearings, both which are made to withstand axial loads.
Space restrictions within planetary gearboxes imply that the earth 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 design around these axial forces for two related reasons. Initial, there is typically hardly any room in a planetary gearbox to incorporate the kind of bulky bearings that may tolerate high axial forces.
Second, the earth gear bearings have to play an active function in torque transfer. Planetary systems split the torque input from the sun gear amongst the planet gears, which transfer torque to a world carrier linked to the gearbox result. The bearings that support the planets on the carrier need to bear the full 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 for his or her size than their tolerance for high axial loads. Generally, small needle roller bearings are the most common choice in these configurations.
Needle roller bearings do a good job with radial loads that are evenly distributed along the distance of the needle. However 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-band gear mesh. Therefore the planet sees significant tilting minute described by the axial power times equipment pitch diameter. This tilting instant creates an uneven load distribution along the needle rollers, significantly lowering the bearings’ load transporting capability and lifecycle.
Loads on the roller bearings will change, depending on their position around the shaft. Second is about the Z-axis, and models are in in . and pounds.
The Planetary Motion MAY BE THE Theory For The Planetary Gearbox.
The Accurately Positioned And Meshed Planet Gears (3) With SUNLIGHT 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 While The 3 Planet Gears Provide The Ouput Via A Planet Carrier .
The Torque Handling Capacity Is Very High DUE TO THE Flexibility , And A Very High Weight /Volume Ratio , Thus It Lends Its Application In Various Industries – Specifically In High Torque Requirements RENDERING IT The Most Economical Remedy.
Being A Proud Provider Of Planetary Gearbox, We Provide A FANTASTIC Distinguished Service To Our Clientile.
Planetary Gearbox Product Specifications :
Provides High Torque At Slow Speeds.
Our Range Of Gearboxes And Geared Motors Are Manufactured ACCORDING TO The American Gear Producers Association (AGMA) Standards.
The Shafts ARE MADE Of Hardened And Tempered Particular Alloy Steel.
Sun And World Gears ARE MADE FROM Case Carburised And Floor Alloy Steel.
Ring Gears ARE MADE 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 Insight And Output Shafts.
Very High Efficiency