Planetary Gear Drive
Drive type: speed reducer
Result torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Selection of input options
Straight in for an on centerline adaptation offering a symmetrical clearance around the hydraulic motor input
Offset straight in allows the hydraulic engine be mounted off center
Right angle input moves the hydraulic electric motor perpendicular to the centerline of the planetary drive for added clearance between components on track drives
Output options
With external shaft includes keyed, flanged or spline options to meet the many required output connections
An added output option includes the result without exterior shaft by providing an internal spline at the output
F25R
Planetary Gear Drive
Ratings
Input power (max)71 kW (95 hp)
Input speed (max)2800 rpm2
Output torque (intermittent)33,895 Nm (25,000 lb-ft)
Output torque (continuous)18,710 Nm (13,800 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 placed at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (not available with all ratios)
General data
Approximate dry weight215 – 263 kg (475 – 580 lb)4
Radial load (max)28,570 kg (63,000 lb)3
Drive typeSpeed reducer
Hydraulic electric motor inputSAE C or D
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Planetary Track Drives
High torque and load capacities, to carry equipment more than the roughest and steepest terrain.
Designed to allow installation of plug-in motors.
Integral multi-disc parking brakes, while still keeping the drive small.
Steel or high-influence spheroidal cast iron structure.
Primary bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports places easy to reach.
Front mechanical seal designed specifically for the earth-moving devices.
Maximum Torque Up to 170,000 Nm
Tranny Ratio Up to 230 iN
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Brevini planetary monitor drives are designed for tracked vehicles and earth-moving Planetary Track Drive machines. They have a heavy-duty casing, a short overall length, and great radial and axial load capacity.
Our gearboxes are given with integral multidisc parking brake and also have been designed for direct installation of hydraulic plug-in motors. The careful choice of the components and design allows our track drives, CTD and CTU, to be used in the most severe environmental working conditions. Brevini planetary monitor drive units will be the perfect solution for crawled undercarriages, drilling, crushing, screening and piling machines.
Planetary Track and Wheel drives
The present day and innovative style, the compact construction and the wonderful performance characteristics of the PGR/PGW series of gear units make these especially suitable for driving rubber tired or tracked self-propelled vehicles.
These compact planetary track drives are specifically created for tracked vehicles: excavators and earth-moving machines.
They have a heavy-duty casing, a brief overall length, and great radial and axial load capacity.
They have an intrinsic multidisc failsafe brake and can be installed directly on hydraulic motors and are ready to accept ‘plug-in’ hydraulic motors.
Characteristics
Type:
planetary
Shaft orientation:
coaxial
Torque:
> 10 kNm
Performance:
high-torque, high load capacity
Other characteristics:
for wheel and track drives, small, rugged, for construction vehicles
Description
This gear shaft final drive includes LO-HI speed and was designed for increased performance. The item is extremely useful specifically in wheeled and tracked devices, which feature a significantly different operating/travel speed ratio.
Note that this is also the proper product for road paving devices, along with construction tools and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear set. In this article, we’ll talk about planetary gear sets, the parts that produce them up, and how they work.
Planetary Gears and Final Drive Motors
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Low Rate, High Torque Motors
The majority of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Velocity and torque are related by power:
Power = Speed x Torque
That means if you want to increase torque for a given horsepower, we need to reduce speed:
Torque = Power / Speed
Hence the term “low-speed, high-torque.” One method of reducing velocity involves the usage of planetary gears. They offer speed reduction which results in torque multiplication. Plus they do that all in a concise package in comparison with gear and pinion velocity reducers, and that means they have superb torque density. Below you can observe a planetary gear program from a final drive motor.
Planetary gear established from a final drive displaying the carrier, ring gear, sun equipment, and planetary gears
Carrier for a couple of three planetary gears from your final drive
Planetary Gear Systems
In a final drive gear hub, you will usually have two sets of three planetary gears that rotate about a sun gear. They also mesh with a stationary ring gear. The upper set of planetary gears are held together by a carrier, as proven in the image above. As possible plainly see, all three gears are arranged an equal distance from each other. At the center is a location for sun gear to mesh and offer input to the machine.
How Last Drive Planetary Gears Work
Let’s take a simplified look in how the planetary gears in a final drive work. Insight power causes sunlight gear to rotate at high rate. The planets mesh with both the sun equipment and the ring gear. They orbit sunlight gear while rolling around the ring gear. The result is low rate, high torque output rotation.
Maintaining the Planetary Gearbox
On a final drive electric motor, the planetary gearbox requires gear oil, also known as equipment lube. It is vital to check the gear oil levels about every 100 hours and change the apparatus oil once a year. If you don’t change out your gear oil, you’ll finish up with a heavy sludge that will result in excessive wear of your planetary gear system. Here at Texas Last Drive, we refer to that as “pudding.”
Another key aspect of keeping your planetary gearbox is usually fixing any leaking seals right away. If a seal is certainly degraded enough to permit essential oil to leak out, after that which means dirt and dirt can make their way in. You don’t want to have your gears look like the gritty mess shown below.
final-drive-hydraulic-motor-gear-oil-sludge-2
Conclusion
Your planetary gearbox is a key component of your final drive. If it fails, you won’t have the ability to generate the torque you should keep your machine shifting. Be sure you check and change the gear oil and don’t ignore leaks. Also keep in mind that pudding and grit aren’t the thing you need in your gearbox!
The present day and innovative style, the compact construction and the wonderful performance characteristics of the PGR/PGW group of gear units make these especially suitable for traveling rubber tired or tracked self-propelled vehicles.