Many “gears” are used for automobiles, however they are also used for many other machines. The most frequent one may be the “tranny” that conveys the energy of engine to tires. There are broadly two functions the transmission of an automobile plays : one can be to decelerate the high rotation quickness 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 at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is difficult to rotate tires with the same rotation rate 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 called deceleration; the ratio of the rotation acceleration 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 ? The reason being substances need a large force to start moving however they do not require this kind of a big force to excersice once they have started to move. Automobile could be cited as a good example. An engine, however, by its nature can’t so finely change its output. As a result, one adjusts its result by changing the decrease ratio employing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of tooth of gears meshing with one another can be deemed as the ratio of the space of levers’ arms. That is, if the decrease ratio is huge and the rotation quickness as output is lower in comparison to that as insight, the power output by transmission (torque) will be huge; if the rotation swiftness as output is not so lower in comparison compared to that as input, on the other hand, the energy output by transmitting (torque) will be little. Thus, to change the decrease ratio utilizing tranny is much akin to the basic principle of moving things.
After that, how does a transmitting modify the reduction ratio ? The answer is based on the mechanism called a planetary equipment mechanism.
A planetary gear system is a gear system consisting of 4 components, namely, sun 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 structure rendering its style or production most difficult; it can understand the high reduction ratio through gears, however, it really is a mechanism suitable for a reduction mechanism 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 achieved with relatively small gears and lower inertia reflected back to the 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 do have some disadvantages. Their complexity in design and manufacturing can make them a far more expensive option than additional gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary gear is positioned closer to the sun gear than the others, imbalances in the planetary gears can occur, resulting in premature wear and failure. Also, the small footprint of planetary gears makes temperature dissipation more difficult, so applications that run at high speed or experience continuous procedure may require cooling.
When using a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical 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 is dependent on the drive configuration.
2 Max input speed linked to ratio and max result speed
3 Max radial load positioned 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 range of Precision Planetary Reducers are ideal for use in applications that demand powerful, precise positioning and repeatability. They were specifically developed for use with state-of-the-art servo engine technology, providing limited integration of the motor to the unit. Design features include installation any servo motors, regular low backlash, high torsional stiffness, 95 to 97% Planetary Gear Reduction efficiency and noiseless running.
They are available in nine sizes with reduction ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output can be provided with a solid shaft or ISO 9409-1 flange, for mounting to rotary or indexing tables, pinion gears, pulleys or other drive elements without the need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute are available. Right-angle and input shaft versions of these reducers are also available.
Typical applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and electronic line shafting. Industries offered include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & floor gearing with minimal wear, low backlash and low sound, making them the the majority of accurate and efficient planetaries available. Standard planetary design has three world gears, with a higher torque version using four planets also available, please see the Reducers with Result Flange chart on the machine Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for app particular 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 eliminate speed fluctuations. The casing can be fitted with a ventilation module to improve insight speeds and lower operational temperature ranges.
Result: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array 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 routine forces rely on the powered load, the swiftness vs. time profile for the cycle, and any other external forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application info will be examined by our engineers, who’ll recommend the best solution for your application.
Ever-Power Automation’s Gearbox product lines offer high precision in 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 are available in sizes from 40mm to 180mm, well suited for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox series provides 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 gear ratios, with torque rankings up to 10,488 in-pounds (167,808 oz-in), and so are appropriate for most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a great 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 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
Additional 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 tooth that are straight and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – easy to manufacture and ideal for an array of applications.
One’s teeth of a spur gear have got an involute profile and mesh 1 tooth at the same time. The involute type means that spur gears just generate radial forces (no axial forces), however the approach to tooth meshing causes ruthless on the gear the teeth and high sound creation. For this reason, spur gears are often used for lower swiftness applications, although they can be utilized at nearly every speed.
An involute equipment tooth carries a profile this is actually the involute of a circle, which means that since two gears mesh, they speak to at a person point where the involutes fulfill. This aspect motions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) 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 throughout the mesh.
Spur gears could be produced from metals such as steel or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce much less sound, but at the trouble of power and loading capability. Unlike other apparatus types, spur gears don’t encounter high losses due to slippage, so they often times have high transmission overall performance. Multiple spur gears can be utilized in series ( referred to as a equipment teach ) to achieve 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 one another and rotate in opposing directions. Internal gears, in contrast, have teeth that are cut inside surface area of the cylinder. An external gear sits inside the internal gear, and the gears rotate in the same direction. Because the shafts sit closer together, internal gear assemblies are more compact than external gear assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are usually seen 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 levels – include consumer appliances such as washing machines and blenders. And while noise limits the usage of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.