Gearbox Bearing Introduction

gearbox bearing

Gearbox Bearing Introduction:

Gearbox bearing is a type of rolling-element bearing similar to an epicyclic gear.
A gearbox is a a kind of rotationg equipment, gearbox bearing (for example 621 GXX, 614 06-11YSX )plays an important role when the equipment rotates.
Therefore, when the gearbox is in use, the installation and inspection of the bearing is very important.

Standard Installation of Gearbox Bearings:

1. Check bearing model, inspect surface, measure radial clearance, clean bearing with oil and heat bearing to 80~100℃. Then keep bearing at this temperature for 30 minutes.

2. Install the bearing (the model should face outwards) and knock the inner ring with a copper rod, close to the shaft shoulder, without clearance, and no looseness. After the bearing cool down, the bearing should be rotated flexibly by hand, and the cage should work normally and rotate smoothly without impact sound. When assembling, pay special attention to the assembly sequence of each part to avoid incorrect assembly or forgetting.

3. Temperature limit is as below,
Rotating machine rolling bearing: 80℃
Rotating machine sliding bearing: 65℃
Motor rolling bearing: 100℃
Motor sliding bearing: 80℃

Maintenance Steps of Gearbox and Bearings:

(1) Prepare the required lifting tools, disassemble the relevant oil and water pipes, and seal them in time.
(2) Remove the screws on the joint surface of the reducer and the end cover screws, take out the stabilizing pins, and place them properly after cleaning.
(3) Measure and record the clearance of each part before repair.
(4) Hang down the upper cover, lift out the gear, and put it in the designated place.
(5) Use kerosene to clean and inspect bearings and gears, and measure bearing clearances, and check the wear of gears and bearing cages.
(6) Release the oil in the box and clean it up.
(7) When replacing the bearing, use a special squeegee. When it is difficult to squeeze and unload, use 120℃ hot engine oil to pour the inner ring of the bearing for heating.
It is strictly forbidden to heat by acetylene flame.
(8) Measure the dimensions of the journal and the inner ring of the new bearing, measure the clearance and record it.
(9) Install the bearing on the journal with oil heating, and install the elastic retaining ring at the same time.
(10) Retest the bearing clearance and record it.
(11) The internal cooling water of the reducer shall be subjected to a hydraulic test and the wear condition shall be checked.
(12) The hoisting gear is in place, and the large gear is turned to make the large and small gears mesh normally and the center is aligned.
(13) Hoist the upper cover of the reducer, measure the clearance at the top of the bearing, measure the axial clearance of each part, and adjust it appropriately.
(14) Coat the joint surface with sealant, put on the positioning pins, and tighten the flange screws on the joint surface.
(15) Assemble the end cover and adjust the cushion.
(16) Connect the oil and water pipes and valves.
(17) Gearbox alignment.

What is the reason for the high temperature of rotating machinery bearings ?

① Low oil level, oil shortage or no oil.
② The oil level is too high and the oil volume is too much.
③ The oil quality is unqualified or deteriorated (impurities in the oil).
④ The cooling water is insufficient or interrupted.
⑤ The oil ring does not carry oil or does not rotate.
⑥ The bearing is defective or damaged.
⑦ Equipment vibration.

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