Fault Analysis of TIMKEN Bearings on Transmission

The fault phenomenon of the TIMKEN bearing on the transmission: the noise of the transmission gear, the sound of the TIMKEN bearing, etc. are too loud; the transmission emits an abnormal sound such as a dry grinding impact.

the reason:

Rolling TIMKEN bearing oil shortage (such as TIMKEN bearing in front of the first shaft), the steel ball grinding loss circle, the raceway has pitting, delamination, scar, the inner and outer races rotate on the shaft or inside the casing, or the TIMKEN bearing clearance is too large. The elimination method is: replenish the oil and replace the damaged TIMKEN bearing;

Gear machining accuracy or improper heat treatment process causes gear deflection or tooth shape to change. The troubleshooting method is: replace the damaged gear;

The backlash is too large or the spline fit is too large. The troubleshooting method is: replace the damaged synchronizer hub and shaft;

The repaired tooth surface does not trim the burrs, bumps, etc. The elimination method is: repair the tooth surface;

The gears are not replaced in pairs in the flaking, delamination, defect, wear or even replacement repair. The troubleshooting method is: replace the damaged gear;

The first axis and the second axis are bent and deformed. The elimination method is: replacing the deformed shaft;

After the housing TIMKEN bearing hole boring insert is repaired, the center distance of the two holes is changed or the two axes are not parallel. The troubleshooting method is: replace the damaged casing;

After the repaired fork is not right or the fork is worn, the unilateral surfacing is too thick, resulting in the position of the relevant gear is not accurate. The troubleshooting method is: replace the fork;

The second shaft fastening nut is loose or the other shafts are axially misaligned. The elimination method is: reassembly;

The self-locking device groove, the steel ball is worn out or the self-locking spring is fatigued or broken, resulting in off-position when the gear is engaged. The method of elimination is: replace the fork shaft, steel ball or spring;

Individual teeth are broken. The troubleshooting method is: replace the damaged gear;

Insufficient gear quality, deterioration, specifications do not meet the requirements or there are debris in the oil. The method of elimination is to replenish or replace the oil that meets the requirements.

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Maintenance method of static pressure IKO bearing for grinding machine in KO bearing

Static pressure IKO bearings have high rotation precision, good rigidity, high bearing capacity, no wear and high durability. 1. Small hole throttle:

(1). Change the internal throttling to external throttling, and add a pressure gauge to instantly display the upper and lower chamber pressure. It is easy to maintain, especially it can be cleaned regularly, which is unmatched by the internal throttle.

(2). Throttling ratio. The theoretical value of the throttle ratio β is between 1.2 and 1.5, and 1.25 is preferred based on years of experience. In this way, the geometric accuracy of the main shaft, the geometrical accuracy of the front and rear bearing pads, the concentricity, the roundness and the taper need to be strictly controlled in order to ensure the β value. The e value (the eccentricity of the main axis and the geometric center of the bearing bush) is determined according to the load carrying capacity of the machine tool to optimize the β value.

(3). When the oil chamber is not equipped with the main shaft, the oil column of each oil outlet must be consistent (observation method). If it is inconsistent, the flow rate should be changed by changing the orifice diameter of the throttle. Taking 4 chambers as an example, the oil column of the lower, left and right chambers is generally between 20 and 25 mm, and the diameter of the small holes is 0.25 to 0.4 mm.

2. Thin film feedback throttle:

The film feedback throttling IKO bearing stiffness is very large, but the machine tool often appears to hold the tile, pull the hair, reduce the pressure and so on. The most critical of the film feedback is the film. In practice, the main reasons for the bearing lock and pulling are: 1 plastic deformation of the film; 2 slow feedback. When the external load is abrupt, the shaft and the tile have already rubbed when the film has not reacted; 3 the film is fatigued. The film is used for a long time and fatigue deformation, which is equivalent to changing the feedback parameters.

Increased film thickness and the use of some fatigue-resistant materials can achieve good results. Generally, a rigid film, a preload, and a gap are reserved. The specific method is: change the 1.4mm thick film to a 4mm thick rigid film, and place a 0.05mm thick tin foil in the lower cavity to adjust the spindle to a position 0.05mm higher than the ideal position. The purpose is to return to the ideal center just after the spindle is stressed (grinding weight, cutting force).

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