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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 in for an on centerline adaptation providing a symmetrical clearance about the hydraulic motor input
Offset straight in allows the hydraulic engine 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 many required output connections
An added output option includes the output without external shaft by providing 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 over the roughest and steepest terrain.
Designed to allow installation of plug-in motors.
Integral multi-disc parking brakes, whilst still keeping the drive compact.
Steel or high-effect spheroidal cast iron structure.
Primary bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports locations easy to reach.
Front side mechanical seal designed particularly for the earth-moving machines.
Maximum Torque Up to 170,000 Nm
Transmission Ratio Up to 230 iN
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Brevini planetary monitor drives are created for tracked automobiles and earth-moving devices. They possess a heavy-duty casing, a short overall length, and great radial and axial load capacity.
Our gearboxes are provided with essential multidisc parking brake and have been created for direct installation of hydraulic plug-in motors. The careful selection of the components and style allows our monitor drives, CTD and CTU, to be used in the most serious environmental working circumstances. Brevini planetary monitor drive units will be the perfect option for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Monitor and Wheel drives
The modern and innovative style, the compact construction and the wonderful performance characteristics of the PGR/PGW series of gear units make these especially suitable for generating 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 integral multidisc failsafe brake and may be installed directly on hydraulic motors and 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, small, rugged, for construction vehicles
Description
This gear shaft final drive includes LO-HI speed and was made for increased performance. That is extremely useful especially in wheeled and tracked devices, which feature a significantly different operating/travel velocity ratio.
Note that this is also the right product for road paving devices, along with construction gear and forestry machines.
Final drive motors are hydraulic motors with a speed reducing, torque multiplying planetary gear arranged. In this article, we’ll talk about planetary gear sets, the parts that make them up, and how they function.
Planetary Gears and Final Drive Motors
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Low Speed, High Torque Motors
The majority 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 increase torque for confirmed horsepower, we have to reduce speed:
Torque = Power / Speed
Hence the word “low-speed, high-torque.” One method of reducing quickness involves the use of planetary gears. They provide speed reduction which outcomes in torque multiplication. And they do this all in a concise package in comparison with gear and pinion velocity reducers, and which means they have exceptional torque density. Below you can see a planetary gear system from your final drive motor.
Planetary gear set from your final drive showing the carrier, ring gear, sun gear, and planetary gears
Carrier for a set of 3 planetary gears from your final drive
Planetary Gear Systems
In your final drive gear hub, you will most likely have two sets of three planetary gears that rotate in regards to a sun gear. They also mesh with a stationary band gear. The upper group of planetary gears are kept together by a carrier, as shown in the picture above. As you can 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 system.
How Final Drive Planetary Gears Work
Let’s have a simplified look in how the planetary gears in a final drive work. Input power causes the sun equipment to rotate at high swiftness. The planets mesh with both the sun gear and the ring gear. They orbit the sun gear while rolling around the ring gear. The effect is low quickness, high torque output rotation.
Maintaining the Planetary Gearbox
On your final drive electric motor, the planetary gearbox needs gear oil, also known as gear lube. It is essential to check the apparatus oil amounts about every 100 hours and change the apparatus oil once a year. In the event that you don’t change out your gear essential oil, you’ll end up with a thick sludge that will lead to excessive put on of your planetary gear system. Here at Texas Last Drive, we make reference to that as “pudding.”
Another key aspect of keeping your planetary gearbox can be fixing any leaking seals right away. If a seal can be degraded enough to allow essential oil to leak out, then which means dirt and dust 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 a key component of your final drive. If it fails, you won’t have the ability to generate the torque you have to keep your machine shifting. Be sure you check and change the gear oil and don’t disregard leaks. Also keep in mind that pudding and grit Planetary Track Drive aren’t what you need in your gearbox!
The modern and innovative style, the compact construction and the wonderful performance characteristics of the PGR/PGW series of gear units make these especially suitable for generating rubber tired or tracked self-propelled vehicles.