Many “gears” are utilized for automobiles, but they are also used for many other machines. The most frequent one is the “transmitting” that conveys the energy of engine to tires. There are broadly two functions the transmission of a car plays : one is certainly to decelerate the high rotation speed emitted by the engine to transmit to tires; the additional 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 extremely hard to rotate tires with the same rotation speed to run, it is necessary to lessen the rotation speed using the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation rate of engine and that of tires is called the reduction ratio.
Then, exactly why is it necessary to modify the reduction ratio in accordance with the acceleration / deceleration or driving speed ? It is because substances require a large force to begin moving however they do not require this kind of a huge force to keep moving once they have began to move. Automobile could be cited as an example. An engine, nevertheless, by its character can’t so finely modify its output. For that reason, one adjusts its output by changing the decrease ratio employing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the number of the teeth of gears meshing with each other 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 lower in comparison compared to that as insight, the energy output by transmitting (torque) will be huge; if the rotation velocity as output isn’t so low in comparison to that as input, on the other hand, the power output by transmitting (torque) will be small. Thus, to change the reduction ratio utilizing tranny is much akin to the principle of moving things.
Then, how does a transmitting change the reduction ratio ? The answer lies in the mechanism called a planetary gear 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 world gears as observed in the graph below. It has a very complex framework rendering its style or production most challenging; it can recognize the high decrease ratio through gears, nevertheless, it is a mechanism suitable for a reduction mechanism that requires both small size and powerful such as for example transmission for automobiles.
In a planetary gearbox, many teeth are engaged at once, that allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back again to the electric motor. Having multiple teeth reveal the load also allows planetary gears to transmit high degrees of torque. The combination of compact size, large speed decrease and high torque tranny makes planetary gearboxes a favorite choice for space-constrained applications.
But planetary gearboxes perform involve some disadvantages. Their complexity in design and manufacturing can make them a far more expensive alternative than other gearbox types. And precision manufacturing is really important for these gearboxes. If one planetary equipment 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 compact footprint of planetary gears makes heat dissipation more difficult, so applications that operate at high speed or experience continuous operation may require cooling.
When using a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment should be inline with each other, although manufacturers offer right-angle designs that incorporate other gear sets (often bevel gears with helical teeth) to provide 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 would depend on the drive configuration.
2 Max input speed related 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 (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 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. These were specifically developed for make use of with state-of-the-art servo electric motor technology, providing limited integration of the motor to the unit. Design features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and silent 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 good 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 amounts down to 1 arc-minute can be found. Right-angle and input shaft versions of the reducers are also available.
Normal applications for these reducers include precision rotary axis drives, traveling gantries & columns, material handling axis drives and electronic line shafting. Industries served include Material Handling, Planetary Gear Reduction Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & ground gearing with minimal put on, low backlash and low noise, making them the the majority of accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with a higher torque version using four planets also obtainable, please start to see the Reducers with Result Flange chart on the Unit Ratings tab under the “+” unit sizes.
Bearings: Optional result bearing configurations for program specific radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral band gear provides higher concentricity and eliminate speed fluctuations. The housing can be fitted with a ventilation module to increase input speeds and lower operational temperatures.
Output: Available in a good shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide range of standard pinions to attach directly to the output style of your choice.
Unit Selection
These reducers are typically selected predicated on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces rely on the driven load, the velocity vs. period profile for the cycle, and any other external forces acting on the axis.
For application & selection assistance, please call, fax or email us. The application info will be reviewed by our engineers, who will recommend the best solution for the application.
Ever-Power Automation’s Gearbox products offer high precision at affordable prices! The Planetary Gearbox item offering contains both In-Line and Right-Position 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, perfect for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox range offers an efficient, cost-effective choice 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 superb gearbox value for servo, stepper, and other motion control applications requiring a NEMA size input/output interface. It includes 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 designed 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 gear, with shafts that are parallel and coplanar, and the teeth that are directly and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – simple to manufacture and suitable for an array of applications.
One’s tooth of a spur gear ‘ve got an involute profile and mesh 1 tooth at the same time. The involute type means that spur gears simply 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 often utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute tools tooth carries a profile this is the involute of a circle, which means that since two gears mesh, they speak to at an individual point where in fact the involutes satisfy. This aspect movements along the tooth areas as the gears rotate, and the type of force ( known as the line of actions ) can be tangent to both base circles. Hence, the gears adhere to the essential regulation of gearing, which statements 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 metal or brass, or from plastics such as nylon or polycarbonate. Gears manufactured 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 because of slippage, so they often have high transmission efficiency. Multiple spur gears can be utilized in series ( known as a gear teach ) to achieve large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have the teeth that are cut externally surface area of the cylinder. Two external 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 exterior gear sits in the internal gear, and the gears rotate in the same path. Because the shafts sit closer together, internal equipment assemblies are smaller sized than external equipment assemblies. Internal gears are mainly used for planetary gear drives.
Spur gears are usually seen as best for applications that require speed decrease and torque multiplication, such as for example ball mills and crushing gear. Types of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer appliances such as washers and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are often found in aircraft engines, trains, and even bicycles.