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Many “gears” are utilized for automobiles, but they are also used for many other machines. The most frequent one is the “transmission” that conveys the power of engine to tires. There are broadly two roles the transmission of an automobile plays : one is usually to decelerate the high rotation quickness emitted by the engine to transmit to tires; the various other is to change the reduction ratio relative to the acceleration / deceleration or generating speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of driving amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Because 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. This kind of a role is named deceleration; the ratio of the rotation acceleration of engine and that of wheels is called the reduction ratio.
Then, why is it necessary to modify the reduction ratio relative to the acceleration / deceleration or driving speed ? The reason being substances need a large force to start moving however they usually do not require this kind of a big force to keep moving once they have began to move. Automobile can be cited as an example. An engine, however, by its nature can’t so finely modify its output. Consequently, one adjusts its output by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with each other can be considered as the ratio of the length of levers’ arms. That is, if the reduction ratio is huge and the rotation velocity as output is lower in comparison compared to that as input, the power output by tranny (torque) will be large; if the rotation velocity as output isn’t so lower in comparison to that as input, on the other hand, the power output by transmitting (torque) will be little. Thus, to change the decrease ratio utilizing transmission is much comparable to the principle of moving things.
Then, how does a tranny modify the reduction ratio ? The answer lies in the mechanism called a planetary equipment mechanism.
A planetary gear system is a gear system comprising 4 components, namely, sunlight gear A, several world gears B, internal equipment C and carrier D that connects planet gears as seen in the graph below. It has a very complex framework rendering its style or production most difficult; it can understand the high reduction ratio through gears, nevertheless, it is a mechanism suitable for a reduction system that requires both small size and high performance such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, that allows high speed decrease to be performed with fairly small gears and lower inertia reflected back to the motor. Having multiple teeth discuss the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, huge speed decrease and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in design and manufacturing can make them a far more expensive remedy than various other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is positioned closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failing. Also, the compact footprint of planetary gears makes warmth dissipation more difficult, therefore planetary gear reduction applications that run at 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 one another, although manufacturers provide right-angle designs that incorporate other gear sets (frequently 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 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 (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 engine input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are ideal for use in applications that demand high performance, precise positioning and repeatability. They were specifically developed for make use of with state-of-the-art servo motor 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 can be purchased in nine sizes with reduction ratios from 3:1 to 600:1 and result torque capacities up to 16,227 lb.ft. The output could be provided with a good 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 are available. Right-angle and insight shaft versions of these 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 offered include Material Handling, 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 the majority of accurate and efficient planetaries offered. Standard planetary design has three world gears, with an increased torque version using four planets also obtainable, please see the Reducers with Result Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for app specific radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral ring gear provides greater concentricity and get rid of speed fluctuations. The housing can be installed with a ventilation module to increase input speeds and lower operational temps.
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 attach right to the output design of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These cycle forces rely on the powered load, the acceleration 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 examined by our engineers, who will recommend the very best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision at affordable prices! The Planetary Gearbox product offering includes both In-Line and Right-Angle 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, perfect for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox range offers an efficient, cost-effective option compatible with 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 so are compatible with most Servo,
SureGear Planetary Gearboxes for Little 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 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
Maintenance free; 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
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 kind of gear – simple to manufacture and ideal for a range of applications.
One’s teeth of a spur gear have got an involute profile and mesh a single tooth simultaneously. The involute type means that spur gears just generate radial forces (no axial forces), however the method of tooth meshing causes ruthless on the gear the teeth and high noise creation. Because of this, spur gears are usually utilized for lower swiftness applications, although they can be utilized at nearly every speed.
An involute products tooth includes a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where the involutes meet. This aspect movements along the tooth areas as the gears rotate, and the kind of force ( referred to as the line of actions ) is usually tangent to both bottom circles. Hence, the gears adhere to the essential regulation of gearing, which statements that the ratio of the gears’ angular velocities must stay continuous throughout the mesh.
Spur gears could possibly be produced from metals such as for example metal or brass, or from plastics such as nylon or polycarbonate. Gears produced from plastic produce less sound, but at the trouble of power and loading capacity. Unlike other devices types, spur gears don’t encounter high losses due to slippage, so they often times have high transmission 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 the teeth that are cut externally surface area of the cylinder. Two exterior gears mesh with one another and rotate in opposing directions. Internal gears, on the other hand, have the teeth that are cut inside surface area of the cylinder. An external gear sits within the internal gear, and the gears rotate in the same path. Because the shafts sit closer together, internal gear assemblies are smaller sized 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 reduction and torque multiplication, such as ball mills and crushing equipment. Types of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer devices such as washing machines 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.