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Many “gears” are utilized for automobiles, but they are also utilized for many other machines. The most frequent one is the “tranny” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one is usually to decelerate the high rotation velocity emitted by the engine to transmit to tires; the other is to change the reduction ratio in accordance with the acceleration / deceleration or generating speed of a car.
The rotation speed of an automobile’s engine in the overall state of traveling amounts to 1 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is impossible to rotate tires with the same rotation velocity to run, it is required to lower the rotation speed using the ratio of the number of gear teeth. Such a role is called deceleration; the ratio of the rotation rate of engine and that of tires is called the reduction ratio.
Then, why is it necessary to modify 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 this kind of a sizable force to keep moving once they have began to move. Automobile can be cited as an example. An engine, however, by its character can’t so finely change its output. Therefore, 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 the teeth of gears meshing with one another can be considered as the ratio of the distance of levers’ arms. That is, if the reduction ratio is huge and the rotation swiftness as output is lower in comparison to that as input, the energy output by transmitting (torque) will be large; if the rotation swiftness as output is not so lower in comparison compared to that as input, however, the energy output by tranny (torque) will be little. Thus, to change the reduction ratio utilizing transmission is much comparable to the principle of moving things.
Then, how does a tranny modify the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear mechanism is a gear mechanism comprising 4 components, namely, sun gear A, several planet gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It includes a very complex framework rendering its design or production most challenging; it can realize the high reduction ratio through gears, nevertheless, it is a mechanism suitable for a reduction system that requires both small size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed reduction 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 reduction and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in design and manufacturing tends to make them a more expensive alternative than various other gearbox types. And precision production is really important for these gearboxes. If one planetary gear is positioned closer to the sun gear compared to the others, imbalances in the planetary gears may appear, resulting in premature wear and failing. Also, the small footprint of planetary gears makes warmth dissipation more difficult, so applications that operate at very high speed or experience continuous operation may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment should be inline with each other, although manufacturers offer right-angle designs that include other gear sets (often bevel gears with helical the teeth) 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 output speed
3 Max radial load positioned 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 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 use with state-of-the-art servo electric motor technology, providing tight 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 calm 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 solid shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive elements without the need for a coupling. For high precision applications, backlash levels down to 1 arc-minute can be found. Right-angle and insight shaft versions of these reducers are also available.
Common 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 & surface gearing with minimal wear, low backlash and low noise, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary style 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 machine Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for program specific radial load, axial load and tilting minute 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 get rid of speed fluctuations. The housing can be installed with a ventilation module to improve input speeds and lower operational temperature ranges.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to install right to the output design of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which often happen during accelerations and decelerations. These cycle forces rely on the driven load, the acceleration vs. period profile for the cycle, and any other exterior forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application information will be Planetary Gear Reduction reviewed by our engineers, who’ll 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-Angle configurations, built with the design goal of offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, ideal for motors which range from NEMA 17 to NEMA 42 and larger. The Spur Gearbox range 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 ratings up to 10,488 in-lbs (167,808 oz-in), and 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 movement control applications requiring a NEMA size input/output interface. It provides 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 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 are a type of cylindrical equipment, with shafts that are parallel and coplanar, and teeth that are directly and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – easy to manufacture and suitable for an array of applications.
One’s teeth of a spur gear have got an involute profile and mesh a single 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 ruthless on the gear one’s teeth and high noise creation. Because of this, spur gears are usually utilized for lower swiftness applications, although they can be utilized at almost every speed.
An involute gear tooth includes 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 satisfy. This aspect actions along the tooth areas as the gears rotate, and the kind of force ( known as the line of actions ) is usually tangent to both bottom circles. Therefore, the gears adhere to the fundamental regulation of gearing, which claims that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could possibly be produced from metals such as for example steel or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce much less sound, but at the difficulty of power and loading capability. Unlike other products types, spur gears don’t encounter high losses due to slippage, so they often have high transmission overall performance. Multiple spur gears can be employed in series ( known as a gear 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 area of the cylinder. Two exterior gears mesh with each other and rotate in opposite directions. Internal gears, on the other hand, have tooth that are cut on the inside surface area of the cylinder. An external gear sits within the internal equipment, 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 mainly used for planetary gear drives.
Spur gears are usually viewed as best for applications that require speed decrease and torque multiplication, such as ball mills and crushing gear. Types of high- velocity applications that use 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.