Many “gears” are used for automobiles, but they are also utilized for many additional machines. The most typical one may be the “transmission” that conveys the power of engine to tires. There are broadly two functions the transmission of an automobile plays : one is usually to decelerate the high rotation speed emitted by the engine to transmit to tires; the other is to change the reduction ratio in accordance with the acceleration / deceleration or driving speed of a car.
The rotation speed of an automobile’s engine in the overall state of driving amounts to at least one 1,000 – 4,000 rotations each and every minute (17 – 67 per second). Since it is extremely hard to rotate tires with the same rotation speed to perform, it is required to lower 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 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 ? The reason being substances require a large force to start moving however they usually do not require this kind of a sizable force to keep moving once they have began to move. Automobile could be cited as an example. An engine, however, by its character can’t so finely alter its output. For that reason, one adjusts its result by changing the reduction ratio utilizing a transmission.
The transmission of motive power through gears very much resembles the principle of leverage (a lever). The ratio of the number of tooth of gears meshing with each other can be deemed as the ratio of the length of levers’ arms. That’s, if the reduction ratio is large and the rotation velocity as output is low in comparison to that as input, the energy output by transmission (torque) will be huge; if the rotation acceleration as output is not so low in comparison compared to that as input, on the other hand, the energy output by transmitting (torque) will be small. Thus, to change the reduction ratio utilizing transmitting is much akin to the basic principle of moving things.
After that, how does a tranny change the reduction ratio ? The answer lies in the mechanism called a planetary gear mechanism.
A planetary gear system is a gear mechanism consisting of 4 components, namely, sun gear A, several world gears B, internal equipment C and carrier D that connects planet 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 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 engaged at once, that allows high speed decrease to be achieved with fairly small gears and lower inertia reflected back again to the electric motor. Having multiple teeth reveal the load also enables planetary gears to transmit high degrees of torque. The combination of compact size, large speed decrease and high torque transmission makes planetary gearboxes a popular choice for space-constrained applications.
But planetary gearboxes do involve some disadvantages. Their complexity in style and manufacturing can make them a far more expensive solution than additional gearbox types. And precision manufacturing 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 may appear, resulting in premature wear and failing. Also, the small footprint of planetary gears makes high temperature dissipation more difficult, so applications that run at high speed or encounter continuous operation may require cooling.
When utilizing a “standard” (i.e. inline) planetary gearbox, the motor and the powered equipment must be inline with one another, although manufacturers offer right-angle designs that include other gear sets (frequently bevel gears with helical tooth) to supply 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 result 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 motor 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 use with planetary gear reduction state-of-the-art servo electric motor technology, providing limited integration of the motor to the unit. Design features include installation any servo motors, regular 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 result torque capacities up to 16,227 lb.ft. The output could be provided with a good 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 are available. Right-angle and insight shaft versions of the reducers are also offered.
Regular 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 & ground gearing with minimal wear, 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 start to see the Reducers with Result Flange chart on the machine Ratings tab under the “+” unit sizes.
Bearings: Optional output bearing configurations for program specific radial load, axial load and tilting instant reinforcement. Oversized tapered roller bearings are standard for the ISO Flanged Reducers.
Housing: Single piece metal housing with integral band gear provides greater concentricity and remove speed fluctuations. The casing can be installed with a ventilation module to increase insight speeds and lower operational temps.
Output: Available in a solid shaft with optional keyway or an ISO 9409-1 flanged interface. We offer a wide variety of standard pinions to attach right to the output design of your choice.
Unit Selection
These reducers are typically selected based on the peak cycle forces, which often happen during accelerations and decelerations. These routine forces rely on the driven load, the acceleration vs. time profile for the cycle, and any other exterior forces functioning on the axis.
For application & selection assistance, please call, fax or email us. The application information will be reviewed by our engineers, who will 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-Position configurations, built with the look goal of offering a cost-effective gearbox, without sacrificing quality. These Planetary Gearboxes are available in sizes from 40mm to 180mm, ideal for motors which range from NEMA 17 to NEMA 42 and larger. The Spur Gearbox line provides an efficient, cost-effective option compatible with Ever-Power Automation’s AC Induction Gear Motors. Ever-Power Automation’s Gearboxes can be found in up to 30 different gear ratios, with torque ratings up to 10,488 in-lbs (167,808 oz-in), and are compatible with most Servo,
SureGear Planetary Gearboxes for Small 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 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
Free of maintenance; requires no additional lubrication
NEMA sizes 17, 23, and 34
Includes hardware for mounting 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 certainly are a type of cylindrical equipment, with shafts that are parallel and coplanar, and tooth 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 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 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 noise creation. Because of this, spur gears are often utilized for lower swiftness applications, although they can be utilized at almost every speed.
An involute apparatus tooth carries a profile this is actually the involute of a circle, which implies that since two gears mesh, they get in touch with at an individual point where in fact the involutes fulfill. This aspect movements along the tooth areas as the gears rotate, and the type of force ( referred to as the line of activities ) is tangent to both base circles. Hence, the gears stick to the fundamental regulation of gearing, which claims that the ratio of the gears’ angular velocities must stay continuous through the entire mesh.
Spur gears could be produced from metals such as metallic or brass, or from plastics such as for example nylon or polycarbonate. Gears manufactured from plastic produce much less sound, but at the trouble of power and loading capability. Unlike other devices types, spur gears don’t encounter high losses because of slippage, so they often have high transmission functionality. Multiple spur gears can be utilized in series ( referred to as a equipment teach ) to realize 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 opposite directions. Internal gears, in contrast, have teeth that are cut inside surface area of the cylinder. An external 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 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 gear. Types of high- velocity applications that make use of spur gears – despite their high noise levels – include consumer devices such as washers 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.