Many “gears” are utilized for automobiles, but they are also utilized for many various 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 a car plays : one is certainly to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the additional is to change the reduction ratio in accordance with the acceleration / deceleration or traveling speed of an automobile.
The rotation speed of an automobile’s engine in the general state of traveling amounts to at least one 1,000 – 4,000 rotations per minute (17 – 67 per second). Since it is impossible to rotate tires with the same rotation quickness to run, it is required to lessen the rotation speed utilizing the ratio of the amount of gear teeth. Such a role is called deceleration; the ratio of the rotation speed of engine and that of wheels is called the reduction ratio.
Then, why is it necessary to change the reduction ratio relative to the acceleration / deceleration or driving speed ? It is because substances require a large force to start moving however they usually do not require this kind of a huge force to excersice once they have started to move. Automobile can be cited as an example. An engine, nevertheless, by its character can’t so Planetary Gear Reduction finely change its output. Therefore, one adjusts its result by changing the decrease ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the amount of teeth of gears meshing with one another can be deemed as the ratio of the space of levers’ arms. That’s, if the decrease ratio is huge and the rotation speed as output is low in comparison to that as insight, the power output by transmission (torque) will be huge; if the rotation acceleration as output isn’t so lower in comparison compared to that as input, on the other hand, the energy output by tranny (torque) will be little. Thus, to improve the reduction ratio utilizing tranny is much comparable to the basic principle of moving things.
Then, how does a transmitting change the reduction ratio ? The answer lies in the system called a planetary equipment mechanism.
A planetary gear mechanism is a gear system consisting of 4 components, namely, sunlight gear A, several planet gears B, internal gear C and carrier D that connects world gears as seen in the graph below. It includes a very complex framework rendering its style or production most challenging; it can realize 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 involved at once, which allows high speed decrease to be achieved with relatively small gears and lower inertia reflected back to the electric motor. Having multiple teeth talk about the load also allows planetary gears to transmit high levels 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 perform have some disadvantages. Their complexity in style and manufacturing can make them a more expensive remedy than additional gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put closer to the sun gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failing. Also, the small footprint of planetary gears makes high temperature dissipation more difficult, therefore applications that operate at high speed or experience continuous procedure may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the driven equipment must be inline with each other, although manufacturers offer right-angle designs that integrate other gear sets (often bevel gears with helical the 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 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 (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 electric 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 use with state-of-the-art servo engine technology, providing restricted integration of the electric motor to the unit. Design features include mounting any servo motors, standard 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 output torque capacities up to 16,227 lb.ft. The output can be provided with a solid shaft or ISO 9409-1 flange, for installation to rotary or indexing tables, pinion gears, pulleys or other drive components without the need for a coupling. For high precision applications, backlash levels right down to 1 arc-minute are available. Right-angle and insight shaft versions of these reducers are also offered.
Normal 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 & surface gearing with minimal use, low backlash and low noise, making them the many accurate and efficient planetaries obtainable. Standard planetary style has three world gears, with a higher torque version using four planets also offered, please see the Reducers with Output Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for application specific radial load, axial load and tilting minute reinforcement. Oversized tapered roller bearings are regular for the ISO Flanged Reducers.
Housing: Single piece steel housing with integral band gear provides better concentricity and eliminate speed fluctuations. The casing can be installed with a ventilation module to improve insight speeds and lower operational temperatures.
Output: 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 mount right to the output style of your choice.
Unit Selection
These reducers are usually selected predicated on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces rely on the driven load, the acceleration vs. period profile for the routine, and any other exterior forces functioning on the axis.
For application & selection assistance, please call, fax or email us. Your application details will be reviewed 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 design goal of offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes can be found in sizes from 40mm to 180mm, ideal for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox series 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 equipment ratios, with torque rankings up to 10,488 in-pounds (167,808 oz-in), and so are compatible with most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is a good gearbox value for servo, stepper, and other motion control applications requiring a NEMA size input/output interface. It offers the best quality designed 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 mounting to SureStep stepper motors
Optional shaft bushings available for mounting to other motors
1-year warranty
Applications
Material handling
Pick and place
Automation
Packaging
Various 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 the teeth that are straight and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – easy to manufacture and suitable for a range of applications.
One’s teeth of a spur gear have got an involute profile and mesh one tooth simultaneously. The involute type means that spur gears simply generate radial forces (no axial forces), however the method of tooth meshing causes ruthless on the gear one’s teeth and high sound creation. For this reason, spur gears are usually utilized for lower swiftness applications, although they could be utilized at almost every speed.
An involute gear tooth includes a profile this is actually the involute of a circle, which means that since two gears mesh, they get in touch with at a person point where the involutes meet. This aspect actions along the tooth areas as the gears rotate, and the type of force ( known as the line of activities ) can be tangent to both bottom circles. Hence, the gears stick to the fundamental regulation of gearing, which promises 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 nylon or polycarbonate. Gears produced from plastic produce much less sound, but at the trouble 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 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 of the cylinder. Two exterior gears mesh with each other and rotate in reverse directions. Internal gears, in contrast, have tooth that are cut on the inside surface of the cylinder. An exterior gear sits within the internal equipment, and the gears rotate in the same path. Because the shafts sit closer together, internal equipment assemblies are more compact 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 equipment. Examples of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer appliances such as washing machines and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.