Planetary Gear Drive
Drive type: speed reducer
Result torque: 33,895 Nm (25,000 lb-ft)
Max input speed: 2800 rpm
Variety of input options
Straight set for an upon centerline adaptation providing a symmetrical clearance about the hydraulic motor input
Offset straight in allows the hydraulic electric motor be mounted off center
Right angle input moves the hydraulic 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 many required output connections
An added output option includes the output without exterior shaft by providing an internal spline at the output
Planetary Gear Drive
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 related 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 (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 engine inputSAE C or D
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Planetary Track Drives
High torque and load capacities, to transport 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 small.
Steel or high-effect spheroidal cast iron structure.
Main bearings provided for high radial and axial load capacities.
Easy maintenance: filling and draining ports locations easy to reach.
Front mechanical seal designed specifically for the earth-moving devices.
Maximum Torque Up to 170,000 Nm
Transmission Ratio Up to 230 iN
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Brevini planetary monitor drives are made 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 provided with essential multidisc parking brake and also have been designed for direct mounting of hydraulic plug-in motors. The careful selection of the Planetary Track Drive materials and design allows our monitor drives, CTD and CTU, to be utilized in the most severe environmental working conditions. Brevini planetary monitor drive units will be the perfect remedy for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Monitor and Wheel drives
The modern and innovative style, the compact construction and the excellent 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 track drives are specifically created for tracked vehicles: excavators and earth-moving machines.
They have a heavy-duty casing, a short overall length, and great radial and axial load capacity.
They have an intrinsic multidisc failsafe brake and can be installed on hydraulic motors and are prepared to accept ‘plug-in’ hydraulic motors.
Shaft orientation:
> 10 kNm
high-torque, high load capacity
Other characteristics:
for wheel and monitor drives, small, rugged, for construction vehicles
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 considerably different operating/travel velocity ratio.
Note that this is also the proper product for street paving machines, 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 discuss planetary gear units, the parts that make them up, and how they work.
Planetary Gears and Final Drive Motors
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Low Rate, High Torque Motors
Most 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 boost torque for confirmed horsepower, we have to reduce speed:
Torque = Power / Speed
Hence the word “low-speed, high-torque.” One way of reducing swiftness involves the use of planetary gears. They provide speed reduction which outcomes in torque multiplication. Plus they do this all in a compact package when compared to gear and pinion velocity reducers, and which means they have exceptional torque density. Below you can see a planetary gear program from a final drive motor.
Planetary gear established from a final drive showing the carrier, ring equipment, sun equipment, and planetary gears
Carrier for a set of three planetary gears from your final drive
Planetary Gear Systems
In your 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 ring gear. The upper set of planetary gears are held collectively by a carrier, as demonstrated in the picture above. As you can plainly see, all three gears are arranged the same distance from each other. At the guts is a place for sun equipment to mesh and offer input to the system.
How Final Drive Planetary Gears Work
Let’s take a simplified look in the way the planetary gears in your final drive work. Insight power causes sunlight equipment to rotate at high rate. The planets mesh with both sun gear and the ring equipment. They orbit the sun equipment while rolling around the band gear. The effect is low acceleration, high torque output rotation.
Maintaining the Planetary Gearbox
On your final drive motor, the planetary gearbox needs equipment oil, also called gear lube. It is vital to check the apparatus oil amounts about every 100 hours and change the gear oil one per year. If you don’t modify out your gear oil, you’ll finish up with a thick sludge that will lead to excessive use of your planetary gear system. At Texas Final Drive, we make reference to that as “pudding.”
Another key aspect of keeping your planetary gearbox can be fixing any leaking seals immediately. If a seal is degraded enough to permit oil to leak out, after that that means dirt and dust can make their way in. You do not want your gears appear to be the gritty mess shown below.
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. Remember to check and modify the gear essential 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 design, 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.