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Many “gears” are used for automobiles, but they are also utilized for many various other machines. The most frequent one may be the “transmitting” that conveys the energy of engine to tires. There are broadly two roles the transmission of a car plays : one is to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the additional is to improve the reduction ratio relative to the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the general state of generating amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is extremely hard to rotate tires with the same rotation speed to perform, it is required to lessen the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation rate of engine and that of wheels is called the reduction ratio.
Then, exactly why is it necessary to alter the reduction ratio in accordance with the acceleration / deceleration or driving speed ? The reason being substances require a large force to begin moving however they do not require this kind of a sizable force to excersice once they have started to move. Automobile could be cited as a good example. An engine, nevertheless, by its nature can’t so finely modify its output. Consequently, one adjusts its result by changing the decrease ratio employing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the number of tooth of gears meshing with one another can be considered as the ratio of the length of levers’ arms. That’s, if the decrease ratio is large and the rotation acceleration as output is lower in comparison 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 Planetary Gear Reduction compared to that as input, however, the energy output by transmission (torque) will be small. Thus, to change the decrease ratio utilizing tranny is much comparable to the theory of moving things.
Then, how does a transmitting change the reduction ratio ? The answer lies in the system called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism comprising 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It includes a very complex structure rendering its style or production most difficult; it can recognize the high decrease ratio through gears, however, it really is a mechanism suited to a reduction mechanism that requires both small size and high performance such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth reveal the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in style and manufacturing can make them a more expensive remedy than additional gearbox types. And precision manufacturing is extremely 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, leading to premature wear and failure. Also, the compact footprint of planetary gears makes warmth dissipation more difficult, so applications that operate at very high speed or encounter continuous procedure may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with each other, although manufacturers provide right-angle designs that include other gear sets (often bevel gears with helical tooth) to supply an offset between your 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 is dependent on the drive configuration.
2 Max input speed linked to ratio and max result speed
3 Max radial load placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable 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 engine 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 motor technology, providing restricted integration of the engine to the unit. Style features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and noiseless running.
They can be purchased in nine sizes with decrease ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output could be provided with a good shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive components without the need for a coupling. For high precision applications, backlash levels right down to 1 arc-minute can be found. Right-angle and insight 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 served include Material Handling, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & floor gearing with minimal put on, low backlash and low noise, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary style has three planet gears, with a higher torque edition using four planets also obtainable, please start to see the Reducers with Output Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for app particular radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides better concentricity and remove speed fluctuations. The casing can be installed with a ventilation module to increase input speeds and lower operational temperature ranges.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide range of standard pinions to install directly to the output design of your choice.
Unit Selection
These reducers are usually selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These cycle forces rely on the powered load, the speed vs. period profile for the cycle, and any other external forces acting on the axis.
For application & selection assistance, please call, fax or email us. Your application info will be examined by our engineers, who will recommend the best solution for your application.
Ever-Power Automation’s Gearbox products 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 offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, ideal for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox series provides an efficient, cost-effective choice appropriate for Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes are offered in up to 30 different equipment ratios, with torque ratings up to 10,488 in-pounds (167,808 oz-in), and are appropriate for most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a superb gearbox value for servo, stepper, and other movement control applications requiring a NEMA size input/output interface. It offers the best quality designed 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 designed for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Other motion control applications requiring a Ever-Power input/output
Spur gears certainly are a type of cylindrical equipment, 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 – simple to manufacture and suitable for a range of applications.
One’s teeth of a spur gear ‘ve got an involute profile and mesh one particular tooth at the same time. The involute type means that spur gears simply generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes ruthless on the gear one’s teeth and high sound creation. For this reason, spur gears are often used for lower swiftness applications, although they could be utilized at nearly every speed.
An involute products tooth includes a profile this is actually the involute of a circle, which means that since two gears mesh, they speak to at an individual point where in fact the involutes fulfill. This aspect actions along the tooth areas as the gears rotate, and the kind of force ( referred to as the line of activities ) is certainly tangent to both base circles. Therefore, the gears adhere to the fundamental 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 sound, but at the difficulty of power and loading capability. Unlike other equipment types, spur gears don’t encounter high losses because of slippage, so they often times have high transmission overall performance. Multiple spur gears can be employed in series ( referred to as a gear teach ) to achieve large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have the teeth that are cut externally surface of the cylinder. Two external gears mesh with each other and rotate in reverse directions. Internal gears, on the other hand, have teeth that are cut inside surface area of the cylinder. An external gear sits within the internal equipment, and the gears rotate in the same direction. Because the shafts sit closer together, internal gear assemblies are smaller sized than external equipment assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are generally seen as best for applications that require speed reduction and torque multiplication, such as for example ball mills and crushing gear. Types of high- velocity applications that use spur gears – despite their high noise levels – include consumer home appliances such as washers and blenders. And while noise limits the utilization of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.