planetary gear reduction

Many “gears” are used for automobiles, however they are also utilized for many various other machines. The most frequent one is the “transmitting” that conveys the power of engine to tires. There are broadly two functions the transmission of a car plays : one is usually to decelerate the high rotation speed emitted by the engine to transmit to tires; the various other is to change the reduction ratio in accordance with the acceleration / deceleration or generating speed of an automobile.
The rotation speed of an automobile’s engine in the general state of driving amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is impossible to rotate tires with the same rotation acceleration to perform, it is necessary to lessen the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is called deceleration; the ratio of the rotation speed of engine and that of tires is named the reduction ratio.
Then, why is it necessary to change the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances require a large force to begin moving however they usually do not require this kind of a sizable force to keep moving once they have began to move. Automobile could be cited as an example. An engine, nevertheless, by its character can’t so finely modify its output. As a result, one adjusts its output by changing the reduction ratio employing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with each other can be deemed as the ratio of the length of levers’ arms. That is, if the reduction ratio is huge and the rotation speed as output is lower in comparison compared to that as insight, the power output by transmission (torque) will be large; if the rotation velocity as output isn’t so lower in comparison compared to that as insight, on the other hand, the power output by tranny (torque) will be small. Thus, to change the decrease ratio utilizing transmitting is much akin to the theory of moving things.
Then, how does a transmitting modify the reduction ratio ? The answer is based on the system called a planetary gear reduction planetary gear mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sun gear A, several world gears B, internal gear C and carrier D that connects planet gears as seen in the graph below. It includes a very complex framework rendering its style or production most difficult; it can recognize the high decrease ratio through gears, nevertheless, it really is a mechanism suited to a reduction mechanism that requires both little size and powerful such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, which allows high speed decrease to be performed with relatively small gears and lower inertia reflected back again to the electric motor. Having multiple teeth share the load also enables planetary gears to transmit high levels of torque. The mixture of compact size, huge speed decrease and high torque transmitting makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive remedy than additional gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is positioned closer to the sun gear compared to the others, imbalances in the planetary gears can occur, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes temperature dissipation more difficult, therefore applications that operate at very high speed or encounter continuous operation may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers offer right-angle designs that include other gear sets (often bevel gears with helical tooth) to supply an offset between the input and output.
Input power (max)27 kW (36 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)12,880 Nm(9,500 lb-ft)
Output torque (continuous)8,135 Nm (6,000 lb-ft)
1 Actual ratio would depend on the drive configuration.
2 Max input speed linked to ratio and max result speed
3 Max radial load positioned at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (not available with all ratios)
Approximate dry weight100 -181 kg (220 – 400 lb)4
Radial load (max)14,287kg (31,500 lb)3
Drive typeSpeed reducer
Hydraulic electric motor input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are perfect for use in applications that demand powerful, precise positioning and repeatability. They were specifically developed for use with state-of-the-art servo electric motor technology, providing restricted integration of the electric motor to the unit. Design features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and quiet running.
They are available in nine sizes with decrease ratios from 3:1 to 600:1 and result torque capacities up to 16,227 lb.ft. The output can be provided with a solid shaft or ISO 9409-1 flange, for mounting to rotary or indexing tables, pinion gears, pulleys or other drive components with no need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute can be found. Right-angle and input shaft versions of the reducers are also offered.
Typical applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and digital line shafting. Industries offered include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal put on, low backlash and low noise, making them the the majority of accurate and efficient planetaries available. Standard planetary design has three world gears, with an increased torque edition using four planets also offered, please start to see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for program particular radial load, axial load and tilting moment reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral band gear provides higher concentricity and remove speed fluctuations. The housing can be installed with a ventilation module to improve insight speeds and lower operational temperature ranges.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect an array of standard pinions to mount directly to the output style of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces depend on the driven load, the rate vs. period profile for the routine, and any other external forces acting on the axis.
For application & selection assistance, please call, fax or email us. Your application information will be examined by our engineers, who’ll recommend the best solution for your application.
Ever-Power Automation’s Gearbox product lines offer high precision at affordable prices! The Planetary Gearbox item offering includes both In-Line and Right-Position configurations, built with the look goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, well suited for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox series offers an efficient, cost-effective choice compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes can be found in up to 30 different equipment ratios, with torque ratings up to 10,488 in-lbs (167,808 oz-in), and so are compatible with most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a superb gearbox value for servo, stepper, and other motion control applications requiring a NEMA size input/output interface. It includes the best quality available for the price point.
Features
Wide range of ratios (5, 10, 25, 50, and 100:1)
Low backlash of 30 arc-min or less
20,000 hour service life
Free of maintenance; requires no additional lubrication
NEMA sizes 17, 23, and 34
Includes hardware for installation to SureStep stepper motors
Optional shaft bushings available for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Additional motion control applications requiring a Ever-Power input/output
Spur gears certainly are a type of cylindrical gear, with shafts that are parallel and coplanar, and the teeth that are straight and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – easy to manufacture and suitable for an array of applications.
One’s the teeth of a spur gear have got an involute profile and mesh one tooth simultaneously. The involute type implies that spur gears simply generate radial forces (no axial forces), nevertheless the method of tooth meshing causes ruthless on the gear one’s teeth and high noise creation. Because of this, spur gears are often utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute products tooth carries a profile this is the involute of a circle, which implies that since two gears mesh, they speak to at a person point where the involutes meet. This aspect movements along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is tangent to both bottom circles. Hence, the gears adhere to the essential regulation of gearing, which promises that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could be produced from metals such as for example metal or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce much less audio, but at the trouble of power and loading capacity. Unlike other tools types, spur gears don’t encounter high losses because of slippage, so they often times have high transmission efficiency. Multiple spur gears can be utilized in series ( known as a gear teach ) to achieve large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears possess one’s teeth that are cut externally surface of the cylinder. Two external gears mesh with one another and rotate in opposite directions. Internal gears, in contrast, have teeth that are cut inside surface of the cylinder. An external gear sits inside the internal equipment, and the gears rotate in the same path. Because the shafts sit closer together, internal gear assemblies are smaller sized than external equipment assemblies. Internal gears are mainly used for planetary equipment drives.
Spur gears are generally seen as best for applications that want speed decrease and torque multiplication, such as for example ball mills and crushing gear. Examples of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer home appliances such as washers and blenders. Even though noise limits the usage of spur gears in passenger automobiles, they are generally used in aircraft engines, trains, and even bicycles.

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