Planetary Gear Drive
Drive type: speed reducer
Result torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Variety of input options
Straight set for an upon centerline adaptation giving a symmetrical clearance about the hydraulic motor input
Offset straight in enables the hydraulic electric motor be mounted off center
Right angle input movements the hydraulic electric motor perpendicular to the centerline of the planetary drive for added clearance between elements on track drives
Output options
With external shaft includes keyed, flanged or spline options to meet the various required output connections
An added output option includes the output without external shaft by offering an interior 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 motor inputSAE C or D
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Planetary Track Drives
High torque and load capacities, to transport equipment more than the roughest and steepest terrain.
Designed to allow installation of plug-in motors.
Integral multi-disc parking brakes, whilst still keeping the drive small.
Steel or high-effect spheroidal cast iron framework.
Primary bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports places easy to reach.
Front side mechanical seal designed specifically for the earth-moving machines.
Optimum Torque Up to 170,000 Nm
Transmitting Ratio Up to 230 iN
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Brevini planetary track drives are made for tracked vehicles and earth-moving devices. They have a heavy-duty casing, a brief overall length, and great radial and axial load capability.
Our gearboxes are given with essential multidisc parking brake and also have been created for direct mounting of hydraulic plug-in motors. The careful selection of the components and design allows our track drives, CTD and CTU, to be used in the most serious environmental working circumstances. Brevini planetary monitor drive units are the perfect answer for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Monitor and Wheel drives
The modern and innovative design, 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.
These compact planetary track drives are specifically made 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 will be installed on hydraulic motors and so are prepared 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 monitor drives, compact, rugged, for construction vehicles
Description
This gear shaft final drive includes LO-HI speed and was created for increased performance. That is extremely useful specifically in wheeled and tracked devices, which feature a considerably different operating/travel speed ratio.
Note that that is also the right product for road paving devices, along with construction tools and forestry machines.
Final drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear established. In this article, we’ll discuss planetary gear sets, the parts that produce them up, and how they function.
Planetary Gears and Last 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. Speed and torque are related by power:
Power = Speed x Torque
That means if you want to enhance torque for confirmed horsepower, we need to reduce speed:
Torque = Power / Speed
Hence the word “low-speed, high-torque.” One way of reducing speed involves the usage of planetary gears. They provide speed reduction which results in torque multiplication. Plus they do that all in a concise package when compared to gear and pinion rate reducers, and which means they have exceptional torque density. Below you can observe a planetary gear system from a final drive motor.
Planetary gear set from a final drive displaying the carrier, ring equipment, sun equipment, and planetary gears
Carrier for a set of three planetary gears from a final drive
Planetary Gear Systems
In a final drive gear hub, you will usually have two sets of three planetary gears that rotate in regards to a sun gear. In addition they mesh with a stationary band gear. The upper set of planetary gears are kept collectively by a carrier, as proven in the image above. As you can plainly see, all three gears are organized an equal distance from one another. At the guts is a place for sun gear to mesh and offer input to the system.
How Final Drive Planetary Gears Work
Let’s take a simplified look at how the planetary gears in a final drive work. Input power causes sunlight equipment to rotate at high speed. The planets mesh with both sun equipment and the ring gear. They orbit sunlight gear while rolling around the band gear. The effect is low rate, high torque output rotation.
Maintaining the Planetary Gearbox
On a final drive electric motor, the planetary gearbox requires gear oil, also referred to as gear lube. It is vital to check the apparatus oil amounts about every 100 hours and change the apparatus oil one per year. If you don’t modify out your gear essential oil, you’ll finish up with a thick sludge that will result in excessive put on of your planetary equipment system. Here at Texas Last Drive, we make reference to that as “pudding.”
Planetary Track Drive another key facet of keeping your planetary gearbox is usually fixing any leaking seals right away. If a seal is usually degraded enough to allow oil to leak out, then that means dirt and dust can make their method in. You don’t want your gears look like the gritty mess demonstrated 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 be able to generate the torque you should keep your machine moving. Be sure you check and modify 
the gear oil and don’t ignore leaks. Also keep in mind that pudding and grit are not what you need in your gearbox!
The present day and innovative style, the compact construction and the excellent performance characteristics of the PGR/PGW series of gear units make these especially suitable for generating rubber tired or tracked self-propelled vehicles.
