Many “gears” are used for automobiles, but they are also used for many additional machines. The most typical one is the “transmission” that conveys the energy of engine to tires. There are broadly two roles the transmission of an automobile plays : one is certainly to decelerate the high rotation swiftness emitted by the engine to transmit to tires; the other is to improve the reduction ratio relative to the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the general state of generating 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 speed to run, it is necessary to lessen the rotation speed utilizing the ratio of the amount of gear teeth. This kind of a role is named deceleration; the ratio of the rotation quickness of engine and that of wheels is called the reduction ratio.
Then, exactly why is it necessary to alter the reduction ratio relative to the acceleration / deceleration or driving speed ? This is because substances require a large force to begin 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 nature can’t so finely modify its output. As a result, one adjusts its output by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears quite definitely resembles the principle of leverage (a lever). The ratio of the number of 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 quickness as output is lower in comparison to that as input, the energy output by transmission (torque) will be large; if the rotation acceleration as output isn’t so low in comparison compared to that as input, however, the energy output by transmitting (torque) will be little. Thus, to change the reduction ratio utilizing tranny is much akin to the principle of moving things.
After that, how does a transmission modify the reduction ratio ? The answer lies in the system called a planetary equipment mechanism.
A planetary gear mechanism is a gear system comprising 4 components, namely, sunlight gear A, several world gears B, internal equipment C and carrier D that connects planet gears as observed in the graph below. It has a very complex framework rendering its style or production most difficult; it can realize the high decrease ratio through gears, nevertheless, it really 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, that allows high speed decrease to be performed with relatively small gears and lower inertia reflected back to the engine. Having multiple teeth share the load also allows planetary gears to transmit high levels of torque. The mixture 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 can make them a far more expensive solution than additional gearbox types. And precision production is really important for these gearboxes. If one planetary equipment is put closer to sunlight gear than the others, imbalances in the planetary gears can occur, resulting in premature wear and failing. Also, the compact footprint of planetary gears makes high temperature dissipation more difficult, so applications that operate at very high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.electronic. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers offer right-angle designs that integrate other gear sets (often bevel gears with helical teeth) to provide 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 output speed
3 Max radial load placed 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 electric motor 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. These were specifically developed for make use of with state-of-the-art servo engine technology, providing limited integration of the motor to the unit. Style features include installation any servo motors, regular low backlash, high torsional stiffness, 95 to 97% efficiency and noiseless running.
They can be purchased in nine sizes with decrease ratios from 3:1 to 600:1 and result torque capacities up to 16,227 lb.ft. The output could 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 with no need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute can be found. Right-angle and input 
shaft versions of the reducers are also available.
Common applications for these reducers include precision rotary axis drives, traveling gantries & columns, materials handling axis drives and digital line shafting. Industries served include Material Managing, Automation, Aerospace, Machine Tool and Robotics.
Unit Design &
Construction
Gearing: Featuring case-hardened & surface gearing with minimal wear, low backlash and low noise, making them the many accurate and efficient planetaries offered. Standard planetary style has three world gears, with a higher torque version using four planets also obtainable, please see the Reducers with Output Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for application particular 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 ring gear provides higher concentricity and eliminate speed fluctuations. The housing can be fitted with a ventilation module to increase insight speeds and lower operational temperature ranges.
Result: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer an array of standard pinions to mount right to the output style of your choice.
Unit Selection
These reducers are usually selected based on the peak cycle forces, which usually happen during accelerations and decelerations. These routine forces rely on the powered load, the velocity vs. time 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 details will be examined by our engineers, who will recommend the 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 design goal of supplying a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, ideal for motors ranging from NEMA 17 to NEMA 42 and larger. 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 are offered in up to 30 different gear ratios, with torque rankings up to 10,488 in-pounds (167,808 oz-in), and are appropriate for most Servo,
SureGear Planetary Gearboxes for Little Ever-Power Motors
The SureGear PGCN series is a great gearbox value for servo, stepper, and other movement 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
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 straight and oriented parallel to the shafts. They’re arguably the easiest and most common kind of gear – simple to manufacture and ideal for a range of applications.
One’s teeth of a spur gear ‘ve got an involute profile and mesh a single tooth simultaneously. The involute type implies that spur gears simply generate radial forces (no axial forces), nevertheless 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 nearly every speed.
An involute products tooth carries a profile this is the involute of a circle, which implies that since two gears mesh, they get in touch with at a person point where in fact the involutes meet. This aspect motions along the tooth areas as the gears rotate, and the type of force ( referred to as the line of actions ) is certainly tangent to both base circles. Therefore, the gears adhere to the fundamental regulation of gearing, which statements that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could be produced from metals such as for example metallic or brass, or from plastics such as nylon or polycarbonate. Gears manufactured from plastic produce much less sound, but at the difficulty of power and loading capability. Unlike other apparatus types, spur gears don’t encounter high planetary gear reduction losses due to slippage, so they often have high transmission overall performance. Multiple spur gears can be utilized in series ( known as a equipment teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears possess the teeth that are cut externally surface of the cylinder. Two exterior gears mesh with each other and rotate in reverse directions. Internal gears, on the other hand, have the teeth that are cut inside surface area of the cylinder. An external gear sits within the internal gear, and the gears rotate in the same path. Because the shafts sit closer together, internal gear assemblies are more compact than external equipment assemblies. Internal gears are mainly used for planetary equipment 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. Types of high- velocity applications that make use of spur gears – despite their high noise amounts – include consumer appliances such as washing machines 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.
