Many “gears” are utilized for automobiles, however they are also used for many additional machines. The most frequent one may be the “transmitting” that conveys the energy 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 various other is to change the reduction ratio in accordance with the acceleration / deceleration or generating 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). Because it is not possible to rotate tires with the same rotation swiftness to perform, it is required to lessen the rotation speed utilizing the ratio of the number of gear teeth. Such a role is called deceleration; the ratio of the rotation velocity of engine and that of tires is named 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 need a large force to start moving however they usually 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 alter its output. Consequently, 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 amount of teeth of gears meshing with one another can be deemed as the ratio of the space of levers’ arms. That is, if the decrease ratio is huge and the rotation acceleration as output is lower in comparison Planetary Gear Reduction compared to that as input, the energy output by transmitting (torque) will be large; if the rotation speed as output is not so lower in comparison compared to that as insight, on the other hand, the power output by tranny (torque) will be little. Thus, to change the reduction ratio utilizing transmitting is much comparable to the principle of moving things.
Then, how does a transmission alter 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, sunlight gear A, several planet gears B, internal equipment C and carrier D that connects world gears as observed in the graph below. It includes a very complex framework rendering its style or production most difficult; it can recognize the high reduction ratio through gears, however, it really is a mechanism suitable for a reduction mechanism that requires both little 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 performed with fairly small gears and lower inertia reflected back to the motor. Having multiple teeth reveal the load also allows planetary gears to transmit high levels of torque. The combination of compact size, large speed decrease and high torque transmission 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 more expensive solution than other gearbox types. And precision manufacturing is extremely 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 small 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.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 (frequently 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 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 (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 engine input SAE C or D hydraulic
Precision Planetary Reducers
This standard selection of Precision Planetary Reducers are ideal 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 engine technology, providing tight integration of the motor to the unit. Design features include mounting any servo motors, standard low backlash, high torsional stiffness, 95 to 97% efficiency and quiet running.
They can be purchased in nine sizes with decrease ratios from 3:1 to 600:1 and output torque capacities up to 16,227 lb.ft. The output could be provided with a good shaft or ISO 9409-1 flange, for mounting to rotary or indexing tables, pinion gears, pulleys or other drive components without the need for a coupling. For high precision applications, backlash amounts right down to 1 arc-minute are available. Right-angle and input shaft versions of these reducers are also offered.
Standard applications for these reducers include precision rotary axis drives, traveling gantries & columns, material 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 put on, low backlash and low sound, making them the many accurate and efficient planetaries available. Standard planetary style has three world gears, with an increased torque version using four planets also offered, please see the Reducers with Result Flange chart on the Unit Ratings tab beneath the “+” unit sizes.
Bearings: Optional result bearing configurations for app particular radial load, axial load and tilting moment reinforcement. Oversized tapered roller bearings are standard 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 improve input speeds and lower operational temperature ranges.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide range of standard pinions to install directly to the output design 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 depend on the driven load, the acceleration 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 examined by our engineers, who’ll recommend the best solution for your application.
Ever-Power Automation’s Gearbox product lines offer high precision at affordable prices! The Planetary Gearbox product offering contains 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, perfect for motors ranging from NEMA 17 to NEMA 42 and larger. The Spur Gearbox series provides an efficient, cost-effective choice appropriate for 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 superb 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 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
Various 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 the teeth that are straight and oriented parallel to the shafts. They’re arguably the simplest and most common type of gear – easy to manufacture and suitable for an array of applications.
One’s tooth of a spur gear ‘ve got an involute profile and mesh a single tooth simultaneously. The involute type implies that spur gears just generate radial forces (no axial forces), however the method of 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 devices tooth includes a profile this is the involute of a circle, which means that since two gears mesh, they speak to at an individual 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 actions ) is definitely tangent to both bottom circles. Therefore, the gears adhere to the essential regulation of gearing, which claims 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 for example metal or brass, or from plastics such as for example nylon or polycarbonate. Gears produced from plastic produce much less audio, but at the trouble of power and loading capacity. Unlike other tools types, spur gears don’t encounter high losses due to slippage, so they often have high transmission functionality. Multiple spur gears can be employed in series ( known as a gear teach ) to attain large reduction ratios.
There are two primary types of spur gears: external and internal. Exterior gears have got one’s teeth that are cut externally surface of the cylinder. Two exterior gears mesh with one another and rotate in reverse directions. Internal gears, on the other hand, have the teeth that are cut on the inside surface area of the cylinder. An exterior gear sits in the internal equipment, and the gears rotate in the same path. Because the shafts sit closer together, internal gear assemblies are smaller sized than external gear assemblies. Internal gears are primarily used for planetary equipment drives.
Spur gears are usually seen as best for applications that want 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 amounts – include consumer home appliances such as washing machines and blenders. And while noise limits the use of spur gears in passenger automobiles, they are often used in aircraft engines, trains, and even bicycles.