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December 20, 2019

Many “gears” are used for automobiles, but they are also used for many additional machines. The most typical one is the “tranny” that conveys the energy of engine to tires. There are broadly two roles the transmission of an automobile 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 in accordance with the acceleration / deceleration or driving speed of a car.
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). Since it is difficult to rotate tires with the same rotation velocity 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 named deceleration; the ratio of the rotation speed of engine and that of tires 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 ? This is because substances need a large force to begin moving however they do not require such a huge force to keep moving once they have started to move. Automobile could be cited as a good 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 utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the number of teeth of gears meshing with one another can be considered as the ratio of the space of levers’ arms. That is, if the decrease ratio is large and the rotation speed as output is lower in comparison to that as input, the energy output by tranny (torque) will be huge; if the rotation swiftness as output isn’t so low in comparison compared to that as input, on the other hand, the energy output by transmission (torque) will be small. Thus, to improve the reduction ratio utilizing tranny is much akin to the theory of moving things.
After that, how does a tranny modify the reduction ratio ? The answer is based on the system called a planetary equipment mechanism.
A planetary gear mechanism is a gear system consisting of 4 components, namely, sunlight gear A, several world gears B, internal gear C and carrier D that connects planet gears as observed in the graph below. It has a very complex framework rendering its design or production most challenging; it can understand the high reduction 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 involved at once, that allows high speed decrease to be performed with relatively small gears and lower inertia reflected back again to the electric motor. Having multiple teeth discuss the load also enables planetary gears to transmit high degrees 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 perform have some disadvantages. Their complexity in design and manufacturing can make them a far more expensive answer than various other gearbox types. And precision production is extremely important for these gearboxes. If one planetary gear is put closer to sunlight gear than the others, imbalances in the planetary gears can occur, planetary gear reduction resulting in premature wear and failure. Also, the compact footprint of planetary gears makes high temperature dissipation more difficult, so applications that operate at very high speed or encounter continuous operation may require cooling.
When utilizing 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 integrate other gear sets (often bevel gears with helical teeth) to provide 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 related 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 selection of Precision Planetary Reducers are perfect for use in applications that demand high performance, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo engine technology, providing limited integration of the engine to the unit. Design features include installation any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and tranquil 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 installation to rotary or indexing tables, pinion gears, pulleys or other drive components without the 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 obtainable.
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 Handling, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal wear, low backlash and low noise, making them the most accurate and efficient planetaries available. Standard planetary style has three world gears, with a higher torque version using four planets also offered, please see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional output bearing configurations for software specific radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral ring gear provides higher concentricity and eliminate speed fluctuations. The housing can be installed with a ventilation module to improve insight speeds and lower operational temperatures.
Output: 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 right to the output style of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces rely on the powered load, the rate vs. time 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 details will be reviewed by our engineers, who’ll recommend the best solution for the application.
Ever-Power Automation’s Gearbox product lines offer high precision at affordable prices! The Planetary Gearbox product offering includes both In-Line and Right-Position configurations, built with the design goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, perfect for motors ranging from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox collection offers an efficient, cost-effective option appropriate for Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes are offered in up to 30 different gear ratios, with torque ratings up to 10,488 in-pounds (167,808 oz-in), and are appropriate for most Servo,
SureGear Planetary Gearboxes for Small 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 offers 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 mounting to SureStep stepper motors
Optional shaft bushings available 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 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 – simple to manufacture and suitable for an array of applications.
One’s tooth of a spur gear ‘ve got an involute profile and mesh one particular tooth at the same time. The involute type implies that spur gears just generate radial forces (no axial forces), nevertheless the approach to tooth meshing causes high pressure on the gear one’s teeth and high noise creation. For this reason, spur gears are often used for lower swiftness applications, although they could be utilized at almost every speed.
An involute tools tooth carries a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at a person point where in fact the involutes meet. This aspect motions along the tooth areas as the gears rotate, and the kind of force ( known as the line of actions ) is certainly tangent to both base circles. Hence, 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 steel or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce much less sound, but at the trouble of power and loading capability. Unlike other equipment types, spur gears don’t encounter high losses because of slippage, therefore they often have high transmission efficiency. Multiple spur gears can be utilized in series ( known as a equipment teach ) to realize 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 exterior gears mesh with each other and rotate in reverse directions. Internal gears, in contrast, have the teeth that are cut inside surface of the cylinder. An external gear sits in the internal gear, and the gears rotate in the same path. Because the shafts are positioned closer together, internal equipment assemblies are more compact than external gear 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 equipment. Types 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 found in aircraft engines, trains, and even bicycles.