Many “gears” are utilized for automobiles, but they are also used for many additional machines. The most frequent one is the “transmission” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one is definitely to decelerate the high rotation quickness emitted by the engine to transmit to tires; the other is to change the reduction ratio relative to the acceleration / deceleration or traveling speed of a car.
The rotation speed of an automobile’s engine in the overall state of traveling amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Because it is not possible to rotate tires with the same rotation swiftness to run, it is necessary to lessen the rotation speed using the ratio of the number of gear teeth. This kind of a role is called deceleration; the ratio of the rotation acceleration of engine and that of tires is called the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to begin moving however they do not require this kind of a sizable force to keep moving once they have began to move. Automobile can be cited as a good example. An engine, nevertheless, by its character can’t so finely alter its output. Therefore, one adjusts its result by changing the reduction ratio utilizing a transmission.
The transmission of motive power planetary gear reduction through gears very much resembles the principle of leverage (a lever). The ratio of the amount of the teeth of gears meshing with each other can be deemed as the ratio of the length of levers’ arms. That’s, if the decrease ratio is huge and the rotation acceleration as output is lower in comparison to that as insight, the energy output by transmission (torque) will be huge; if the rotation acceleration as output isn’t so lower in comparison compared to that as insight, on the other hand, the energy output by transmission (torque) will be small. Thus, to improve the decrease ratio utilizing transmitting is much comparable to the theory of moving things.
After that, how does a transmission alter the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear mechanism is a gear mechanism consisting of 4 components, namely, sunlight gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It includes a very complex framework rendering its style or production most challenging; it can recognize the high decrease ratio through gears, however, it 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 involved at once, which allows high speed reduction to be achieved with fairly small gears and lower inertia reflected back again to the motor. Having multiple teeth discuss the load also allows planetary gears to transmit high levels of torque. The mixture of compact size, huge speed reduction and high torque transmission makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing can make them a far more expensive option than additional gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put 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 heat dissipation more difficult, therefore applications that run at very high speed or encounter continuous operation may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment should be inline with one another, although manufacturers offer right-angle designs that include other gear sets (frequently bevel gears with helical teeth) 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 would depend on the drive configuration.
2 Max input speed linked to ratio and max output speed
3 Max radial load placed 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 range of Precision Planetary Reducers are perfect for use in applications that demand powerful, precise positioning and repeatability. They were specifically developed for make use of with state-of-the-art servo engine technology, providing limited integration of the electric motor to the unit. Style features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and calm running.
They can be purchased 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 good shaft or ISO 9409-1 flange, for mounting to rotary or indexing tables, pinion gears, pulleys or other drive elements with no need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute are available. Right-angle and input shaft versions of these reducers are also available.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries served include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal use, low backlash and low noise, making them the most accurate and efficient planetaries obtainable. Standard planetary design has three world gears, with an increased torque edition using four planets also obtainable, please see the Reducers with Output Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output 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 casing can be fitted with a ventilation module to improve input speeds and lower operational temperatures.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to mount right to the output design of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces rely on the powered load, the velocity vs. time profile for the routine, and any other exterior forces functioning 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 the 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 supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, ideal for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox series offers an efficient, cost-effective option appropriate for 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 rankings up to 10,488 in-pounds (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is an excellent gearbox value for servo, stepper, and other movement control applications requiring a NEMA size input/output interface. It provides the best quality available for the price point.
Features
Wide variety 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
Various other motion control applications requiring a Ever-Power input/output
Spur gears are a type of cylindrical gear, with shafts that are parallel and coplanar, and the teeth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common kind of gear – easy to manufacture and ideal for an array of applications.
One’s tooth of a spur gear ‘ve got an involute profile and mesh 1 tooth simultaneously. 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 noise creation. Because of this, spur gears are usually used for lower swiftness applications, although they could be utilized at almost every speed.
An involute apparatus tooth includes a profile this is actually the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where the involutes satisfy. This aspect movements along the tooth areas as the gears rotate, and the type of force ( referred to as the line of activities ) can be tangent to both bottom circles. Therefore, the gears adhere to the fundamental regulation of gearing, which statements that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could be produced from metals such as metallic 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 capability. Unlike other gear types, spur gears don’t encounter high losses because of slippage, therefore they often times have high transmission functionality. Multiple spur gears can be employed in series ( referred to as a equipment teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have got one’s teeth that are cut externally surface area of the cylinder. Two external gears mesh with each other and rotate in opposite directions. Internal gears, in contrast, have the teeth that are cut on the inside surface area of the cylinder. An external gear sits in the internal equipment, and the gears rotate in the same path. Because the shafts sit closer together, internal equipment assemblies are smaller sized than external equipment assemblies. Internal gears are primarily used for planetary gear 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 equipment. Examples of high- velocity applications that use spur gears – despite their high noise levels – include consumer devices such as washers and blenders. And while noise limits the utilization of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.