Many “gears” are used for automobiles, however they are also used for many various other machines. The most typical one is the “tranny” that conveys the power of engine to tires. There are broadly two functions the transmission of an automobile plays : one is certainly to decelerate the high rotation acceleration emitted by the engine to transmit to tires; the other is to change the reduction ratio relative to the acceleration / deceleration or driving speed of an automobile.
The rotation speed of an automobile’s engine in the overall state of traveling amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is unattainable to rotate tires with the same rotation rate to perform, it is required to lower 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 swiftness 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 begin moving however they usually do not require this kind of a sizable force to keep moving once they have began to move. Automobile could be cited as an example. An engine, nevertheless, by its nature can’t so finely change its output. For that reason, one adjusts its result by changing the reduction ratio employing 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 deemed as the ratio of the space of levers’ arms. That is, if the decrease ratio is large and the rotation rate as output is low in comparison compared to that as input, the power output by tranny (torque) will be large; if the rotation rate as output is not so lower in comparison to that as insight, however, the energy output by tranny (torque) will be little. Thus, to improve the reduction ratio utilizing tranny is much comparable to the theory of moving things.
Then, how does a transmission change the reduction ratio ? The answer is based on the system called a planetary gear mechanism.
A planetary gear system is a gear mechanism comprising 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects world gears as seen in the graph below. It has a very complex framework rendering its style or production most difficult; it can recognize the high decrease ratio through gears, however, it is a mechanism suited to a reduction system that requires both little 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 discuss the load also allows planetary gears to transmit high levels of torque. The mixture of compact size, huge speed decrease and high torque transmitting makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform have some disadvantages. Their complexity in style and manufacturing tends to make them a far more expensive answer than various other gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is positioned closer to sunlight gear than the others, imbalances in the planetary gears may appear, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes high temperature dissipation more difficult, therefore applications that operate at very high speed or encounter continuous procedure may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers provide right-angle designs that include other gear sets (frequently bevel gears with helical tooth) 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 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 (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 engine 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. They were specifically developed for make use of with state-of-the-art servo engine technology, providing restricted integration of the motor to the unit. Design features include installation any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and calm running.
They are available in nine sizes with reduction 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 levels down to 1 arc-minute are available. Right-angle and input shaft versions of the reducers are also offered.
Usual applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and digital line shafting. Industries offered include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & ground gearing with minimal wear, low backlash and low sound, making them the the majority of accurate and efficient planetaries offered. Standard planetary style has three planet gears, with an increased torque edition using four planets also obtainable, please start to see the Reducers with Output Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for application particular radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral band gear provides greater concentricity and remove speed fluctuations. The housing can be installed with a ventilation module to improve input speeds and lower operational temperature ranges.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to install directly 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 routine forces depend on the powered load, the rate vs. period profile for the cycle, and any other exterior forces acting on the axis.
For application & selection assistance, please call, fax or email us. The application information will be examined by our engineers, who’ll recommend the very 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-Angle configurations, built with the look goal of offering 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 bigger. The Spur Gearbox collection offers an efficient, cost-effective option compatible with 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 are compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a great gearbox value for servo, stepper, and other motion control applications requiring a NEMA size input/output interface. It includes 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
Maintenance free; requires no additional lubrication
NEMA sizes 17, 23, and 34
Includes hardware for installation to SureStep stepper motors
Optional shaft bushings designed 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 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 have got an involute profile and mesh a single tooth at the same time. The involute type means that spur gears just generate radial forces (no axial forces), nevertheless the method of tooth meshing causes ruthless on the gear one’s teeth and high noise creation. Because of this, spur gears are often utilized for lower swiftness applications, although they could be utilized at nearly every speed.
An involute gear tooth carries a profile this is actually the involute of a circle, which implies that since two gears mesh, they speak to at a person point where in fact the involutes satisfy. This aspect motions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is definitely tangent to both base circles. Hence, the gears stick to the essential regulation of gearing, which claims 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 metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce less audio, but at the difficulty of power and loading capability. Unlike other products types, spur gears don’t encounter high losses due to slippage, therefore they often have high transmission efficiency. Multiple spur gears can be employed in series ( referred to as a gear teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have one’s teeth that are cut planetary gear reduction externally surface of the cylinder. Two external gears mesh with one another and rotate in opposite directions. Internal gears, on the other hand, have teeth that are cut inside surface area of the cylinder. An exterior 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 equipment assemblies. Internal gears are primarily used for planetary gear drives.
Spur gears are generally viewed as best for applications that want 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 appliances such as washers and blenders. Even though noise limits the usage of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.