Many “gears” are used for automobiles, but they are also utilized for many various other machines. The most typical one is the “transmission” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one can be to decelerate the high rotation speed emitted by the engine to transmit to tires; the other is to change the reduction ratio relative to the acceleration / deceleration or traveling 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 per minute (17 – 67 per second). Since it is unattainable to rotate tires with the same rotation rate to run, it is necessary to lessen 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 speed of engine and that of wheels is named the reduction ratio.
Then, why is it necessary to alter the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to begin 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 a good example. An engine, nevertheless, by its nature can’t so finely modify its output. Consequently, one adjusts its output 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 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 reduction 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 huge; if the rotation rate as output is not so low in comparison compared to that as input, on the other hand, the power output by transmission (torque) will be little. Thus, to improve the decrease ratio utilizing transmitting is much comparable to the basic principle of moving things.
After that, how does a transmitting change the reduction ratio ? The answer is based on the system called a planetary equipment mechanism.
A planetary gear system is a gear system comprising 4 components, namely, sun gear A, several world gears B, internal gear C and carrier D that connects planet gears as observed in the graph below. It includes a very complex structure rendering its style or production most challenging; it can realize the high reduction ratio through gears, nevertheless, it really is a mechanism suitable for a reduction mechanism that requires both little 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 electric motor. Having multiple teeth talk about the load also enables planetary gears to transmit high levels of torque. The combination of compact size, huge speed decrease and high torque tranny makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do have some disadvantages. Their complexity in style and manufacturing tends to make them a more expensive answer than additional gearbox types. And precision production is really important for these gearboxes. If one planetary gear is positioned closer to sunlight gear than the others, imbalances in the planetary gears can occur, resulting in premature wear and failure. Also, the compact footprint of planetary gears makes heat dissipation more difficult, so applications that run at very high speed or encounter continuous procedure 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 incorporate other gear sets (often bevel gears with helical tooth) to supply an offset between your 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 related 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 (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 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 high performance, precise positioning and repeatability. They were specifically developed for make use of with state-of-the-art servo electric motor technology, providing tight integration of the engine to the unit. Style features include mounting any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and silent 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 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 insight shaft versions of the reducers are also offered.
Typical 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 many accurate and efficient planetaries available. Standard planetary design has three world gears, with an increased torque edition using four planets also obtainable, please see the Reducers with Output Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for application specific radial load, axial load and tilting second reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral ring gear provides greater concentricity and eliminate speed fluctuations. The housing can be installed with a ventilation module to increase insight speeds and lower operational temperature ranges.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide variety of standard pinions to mount directly 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 speed vs. period profile for the routine, and any other exterior forces functioning on the axis.
For application & Planetary Gear Reduction selection assistance, please call, fax or email us. Your application info will be reviewed by our engineers, who will recommend the best solution for the application.
Ever-Power Automation’s Gearbox product lines offer high precision in affordable prices! The Planetary Gearbox item offering contains both In-Line and Right-Position 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, perfect for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox line 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 rankings up to 10,488 in-lbs (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a good gearbox value for servo, stepper, and other movement 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 mounting 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 are a type of cylindrical gear, 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 suitable for a range of applications.
One’s the teeth of a spur gear have got an involute profile and mesh one particular tooth simultaneously. The involute type means that spur gears simply generate radial forces (no axial forces), nevertheless the method of tooth meshing causes ruthless on the gear the teeth and high noise creation. Because of this, spur gears are usually used for lower swiftness applications, although they could be utilized at nearly every speed.
An involute tools tooth includes a profile this is the involute of a circle, which means that since two gears mesh, they speak to at a person point where in fact the involutes satisfy. This aspect actions along the tooth areas as the gears rotate, and the type of force ( known as the line of actions ) is usually 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 be produced from metals such as metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce much less sound, but at the trouble of power and loading capacity. Unlike other equipment types, spur gears don’t encounter high losses due to slippage, therefore they often times have high transmission functionality. Multiple spur gears can be employed 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 have one’s teeth that are cut externally surface of the cylinder. Two exterior gears mesh with one another and rotate in opposing directions. Internal gears, on the other hand, have teeth that are cut inside surface of the cylinder. An external gear sits in the internal equipment, and the gears rotate in the same direction. Because the shafts sit closer together, internal equipment assemblies are more compact than external gear assemblies. Internal gears are mainly used for planetary equipment drives.
Spur gears are usually seen as best for applications that want 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. Even though noise limits the use of spur gears in passenger automobiles, they are generally used in aircraft engines, trains, and even bicycles.