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 giving a symmetrical clearance about the hydraulic motor input
Offset straight in enables the hydraulic electric motor be mounted off center
Right angle input techniques 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 exterior 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 is dependent on the drive configuration.
2 Max input speed related to ratio and max output 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 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 particularly 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 machines. They have a heavy-duty casing, a short overall duration, and great radial and axial load capacity.
Our gearboxes are given with essential multidisc parking brake and have been made for direct mounting of hydraulic plug-in motors. The careful choice of the components and style allows our Planetary Track Drive monitor drives, CTD and CTU, to be used in the most severe environmental working circumstances. Brevini planetary monitor drive units are the perfect option for crawled undercarriages, drilling, crushing, screening and piling devices.
Planetary Monitor and Wheel drives
The present day 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.
These compact planetary track drives are specifically designed 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 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 monitor drives, compact, 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 machines, which feature a significantly different operating/travel swiftness ratio.
Note that this is also the right product for street paving devices, 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 discuss planetary gear models, the parts that produce them up, and how they function.
Planetary Gears and Last Drive Motors
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Low Swiftness, High Torque Motors
Most of the hydraulic motors used for propel motors are low-speed, high-torque (LSHT) motors. Quickness and torque are related by power:
Power = Speed x Torque
That means if you want to enhance torque for confirmed horsepower, we have to reduce speed:
Torque = Power / Speed
Hence the term “low-speed, high-torque.” One way of reducing acceleration involves the use of planetary gears. They offer speed reduction which results in torque multiplication. And they do this all in a concise package in comparison with gear and pinion acceleration reducers, and which means they have excellent torque density. Below you can see a planetary gear system from your final drive motor.
Planetary gear arranged from your final drive displaying the carrier, ring equipment, sun gear, and planetary gears
Carrier for a set of 3 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 in regards to a sun gear. In addition they mesh with a stationary band gear. The upper set of planetary gears are kept with each other by a carrier, as shown in the image above. As you can see, all three gears are arranged the same distance from one another. At the center is a location for sun equipment to mesh and offer input to the machine.
How Final Drive Planetary Gears Work
Let’s take a simplified look in how the planetary gears in a final drive work. Insight power causes the sun equipment to rotate at high velocity. The planets mesh with both sun equipment and the ring equipment. They orbit sunlight gear while rolling around the band gear. The effect is low velocity, high torque result rotation.
Maintaining the Planetary Gearbox
On a final drive motor, the planetary gearbox requires gear oil, also referred to as equipment lube. It is essential 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 essential oil, you’ll end up with a solid sludge that will result in excessive put on of your planetary equipment system. At Texas Last Drive, we make reference to that as “pudding.”
Another key facet of keeping your planetary gearbox is definitely fixing any leaking seals immediately. If a seal is usually degraded enough to permit oil to leak out, after that which means dirt and dirt can make their method in. You don’t want your gears look like the gritty mess shown 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 shifting. Be sure you check and change the gear oil and don’t disregard leaks. Also keep in mind that pudding and grit aren’t what you need in your gearbox!
The present day and innovative design, the compact construction and the wonderful performance characteristics of the PGR/PGW group of gear units make these especially ideal for generating rubber tired or tracked self-propelled vehicles.