Many “gears” are used for automobiles, however they are also utilized for many various other machines. The most frequent one is the “transmitting” that conveys the power of engine to tires. There are broadly two roles the transmission of an automobile plays : one is to decelerate the high rotation acceleration emitted by the engine to transmit to tires; the other is to improve the reduction ratio in accordance with the acceleration / deceleration or driving speed of an automobile.
The rotation speed of an automobile’s engine in the general state of driving amounts to 1 1,000 – 4,000 rotations per minute (17 – 67 per second). Because it is difficult to rotate tires with the same rotation velocity to perform, it is required to lower the rotation speed using the ratio of the amount of gear teeth. Such a role is named deceleration; the ratio of the rotation speed of engine and that of wheels is named the reduction ratio.
Then, why is it necessary to change the reduction ratio in accordance with the acceleration / deceleration or driving speed ? This is because substances need a large force to start moving however they usually do not require such a huge force to excersice once they have began to move. Automobile could be cited as a good example. An engine, however, by its character can’t so finely alter its output. For that reason, 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 tooth of gears meshing with one another can be considered as the ratio of the distance of levers’ arms. That is, if the reduction ratio is large and the rotation rate as output is lower in comparison to that as input, the power output by transmitting (torque) will be large; if the rotation speed as output is not so low in comparison to that as input, however, the power output by transmitting (torque) will be little. Thus, to change the reduction ratio utilizing transmitting is much akin to the theory of moving things.
After that, how does a transmitting change the reduction ratio ? The answer is based on the mechanism called a planetary gear mechanism.
A planetary gear system is a gear system comprising 4 components, namely, sun gear A, several planet gears B, internal gear C and carrier D that connects planet gears as seen in the graph below. It includes a very complex structure rendering its design or production most difficult; it can recognize the high decrease ratio through gears, however, it really is a mechanism suitable for a reduction system that requires both little size and powerful such as transmission for automobiles.
In a planetary gearbox, many teeth are involved at once, which allows high speed decrease to be performed with relatively 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 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 style and manufacturing tends to make them a more expensive remedy than other gearbox types. And precision manufacturing is extremely important for these gearboxes. If one planetary equipment is put closer to sunlight gear compared to the others, imbalances in the planetary gears can occur, leading to premature wear and failure. Also, the small footprint of planetary gears makes temperature dissipation more difficult, therefore applications that run at high speed or encounter continuous procedure may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with each other, although manufacturers provide right-angle designs that incorporate 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 is dependent on the drive configuration.
2 Max input speed linked 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 (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 ideal for use in applications that demand high performance, precise positioning and repeatability. These were specifically developed for use with state-of-the-art servo motor technology, providing tight integration of the motor to the unit. Style features include installation any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and quiet running.
They are available in nine sizes with decrease 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 installation to rotary or indexing tables, pinion gears, pulleys or other drive components without the need for a coupling. For high precision applications, backlash amounts down to 1 arc-minute can be found. Right-angle and insight shaft versions of the reducers are also offered.
Usual applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and digital line shafting. Industries offered include Material Handling, 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 offered. Standard planetary style has three planet gears, with an increased torque version using four planets also available, please start to see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result 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 metal housing with integral band gear provides greater concentricity and eliminate speed fluctuations. The casing can be fitted with a ventilation module to increase input speeds and lower operational temps.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. You can expect a wide selection of standard pinions to install directly to the output style 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 depend on the powered load, the quickness vs. period profile for the cycle, and any other external 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’ll recommend the best solution for your application.
Ever-Power Automation’s Gearbox products offer high precision in affordable prices! The Planetary Gearbox item 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 are available in sizes from 40mm to 180mm, well suited for motors which range from NEMA 17 to NEMA 42 and bigger. The Spur Gearbox range offers an efficient, cost-effective choice compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes are offered in up to 30 different gear ratios, with torque ratings up to 10,488 in-pounds (167,808 oz-in), and are appropriate for most Servo,
SureGear Planetary Gearboxes for Small Ever-Power Motors
The SureGear PGCN series is an excellent 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 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 available 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 certainly are a type of cylindrical equipment, with shafts that are parallel and coplanar, and teeth that are directly and oriented parallel to the shafts. They’re arguably the easiest and most common type of gear – simple 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 tooth at the same time. The involute type implies that spur gears just generate radial forces (no axial forces), however the method of tooth meshing causes high pressure on the gear one’s teeth and high sound creation. Because of this, spur gears are often used for lower swiftness applications, although they can be utilized at almost every speed.
An involute devices tooth carries 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 fulfill. This aspect actions along the tooth areas as the gears rotate, and the kind of force ( known as the line of actions ) is definitely tangent to both foundation circles. Hence, the gears adhere to the fundamental 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 planetary gear reduction example metal or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce less sound, but at the difficulty of power and loading capacity. Unlike other apparatus types, spur gears don’t encounter high losses due to slippage, so they often have high transmission functionality. Multiple spur gears can be utilized in series ( known 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 area of the cylinder. Two external gears mesh with one another and rotate in opposing directions. Internal gears, on the other hand, have tooth that are cut on the inside surface of the cylinder. An external gear sits inside the internal equipment, and the gears rotate in the same direction. Because the shafts are positioned closer together, internal gear assemblies are smaller sized than external equipment assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are usually viewed as best for applications that want speed decrease and torque multiplication, such as ball mills and crushing equipment. Examples of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer home appliances such as washing machines and blenders. Even though noise limits the use of spur gears in passenger automobiles, they are generally found in aircraft engines, trains, and even bicycles.