Planetary Gear Drive
Drive type: speed reducer
Output torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Features
Variety of input options
Straight set for an on centerline adaptation providing a symmetrical clearance around the hydraulic motor input
Offset straight in enables the hydraulic electric motor be mounted off center
Right angle input movements the hydraulic engine 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 various required output connections
An added output choice includes the result without exterior 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 positioned at optimum load position
4 Weight varies with configuration and ratio selected
5 Requires tapered roller planet bearings (unavailable 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 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-impact spheroidal cast iron framework.
Main bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports places easy to reach.
Front mechanical seal designed particularly for the earth-moving devices.
Optimum Torque Up to 170,000 Nm
Transmission Ratio Up to 230 iN
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Brevini planetary monitor drives are designed for tracked automobiles and earth-moving machines. They have a heavy-duty casing, a short overall length, and great radial and axial load capability.
Our gearboxes are given with integral multidisc parking brake and have been designed for direct installation of hydraulic plug-in motors. The careful selection of the materials and design allows our monitor drives, CTD and CTU, to be utilized in the most severe environmental working conditions. Brevini planetary track drive units will be the perfect option for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Monitor and Wheel drives
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 generating rubber tired or tracked self-propelled vehicles.
These compact planetary monitor 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 may be installed directly on hydraulic motors and so 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. That is extremely useful specifically in wheeled and tracked devices, which feature a significantly different operating/travel quickness ratio.
Note that that is also the proper product for street paving machines, along with construction gear and forestry machines.
Last drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear set. In this post, we’ll talk about planetary gear models, the parts that produce them up, and how they work.
Planetary Gears and Last Drive Motors
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Final Drive Motors and Gears
3 Things YOU HAVE TO KNOW About Gear Oil for Final Drives
How to Troubleshoot an Overheating Gear Box
Low Rate, High Torque Motors
Most of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Acceleration and torque are related by power:
Power = Speed x Torque
That means if you want to enhance torque for a given horsepower, we need to reduce speed:
Torque = Power / Speed
Hence the word “low-speed, high-torque.” One way of reducing acceleration involves the usage of planetary gears. They offer speed reduction which results in torque multiplication. And they do that all in a concise package in comparison with gear and pinion velocity reducers, and that means they have excellent torque density. Below you can see a planetary gear system from your final drive motor.
Planetary gear established from your final drive showing 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 your final drive gear hub, you will usually have two sets of three planetary gears that rotate about a sun gear. In addition they mesh with a stationary ring gear. The upper set of planetary gears are held with each other by a carrier, as shown in the image above. As you can plainly see, all three gears are organized an equal distance from each other. At the guts is a location for sun gear to mesh and offer input to the machine.
How Final Drive Planetary Gears Work
Let’s have a simplified look at the way the planetary gears in your final drive work. Input power causes the sun gear to rotate at high speed. The planets mesh with both the sun gear and the ring equipment. They orbit the sun equipment while rolling around the band gear. The effect is low quickness, high torque result rotation.
Maintaining the Planetary Gearbox
On a final drive engine, the planetary gearbox needs equipment oil, also known as equipment lube. It is vital to check the apparatus oil levels about every 100 hours and change the apparatus oil one per year. If you don’t modify out your gear oil, you’ll end up with a solid sludge that will lead to excessive put on of your planetary gear system. Here at Texas Final Drive, we make reference to that as “pudding.”
Another key aspect of maintaining your planetary gearbox is usually fixing any leaking seals right away. If a seal is definitely degraded enough to allow essential oil to leak out, then which means dirt and dirt can make their way 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 an essential component of your final drive. If it fails, you won’t have the ability to generate the torque you need to keep your machine moving. Remember to check and alter the gear oil and don’t disregard leaks. Also keep in mind that pudding and grit are not what you need in your gearbox!
The modern and innovative design, the compact construction and the excellent performance characteristics of the PGR/PGW group of gear units make these especially suitable for traveling rubber tired or tracked self-propelled vehicles.