The limit of the thin wall bearings contact Angle

The limit of the thin wall bearings contact Angle is 120 °. When the sliding bearing wear and tear to the contact Angle, fluid lubrication will be destroyed. So don't affect the sliding bearing compressive conditions under the premise of the smaller the contact Angle is better. From the theoretical analysis of the friction torque, when the contact Angle is 60 °, minimum friction torque, so, the speed is higher than 500 r/min of miniature linear bearings, contact Angle 60 °, speed is less than 500 r/min of sliding bearing, contact Angle can be used in a 90 °, 60 ° is used.

Shaft neck and the actual situation of the sliding bearing surface contact, available per unit area of the actual contact points. The more contact, more and more even, said sliding bearing scraping the research better, on the other hand, sliding bearing scraping the inquiry is not good. In general the more the more close contact point, research difficulty is large. Production should be based on the performance of the sliding bearing and working conditions to determine the contact point

The linear plain bearings grease lubrication cycle:

By accident, linear plain bearings not important parts: shaft speed < 200 r/min, the lubrication cycle 5 days; Shaft speed > 200 r/min, the lubrication cycle 3 days.

Continuous work: shaft speed < 200 r/min, the lubrication cycle 2 days; Shaft speed > 200 r/min, the lubrication cycle 1 days.

Continuous work, operating temperature less than 40 ℃ : shaft speed < 200 r/min, the lubrication cycle 1 days; Shaft speed > 200 r/min, the lubrication cycle once per class.

Continuous work, operating temperature 40-100 ℃ : shaft speed < 200 r/min, the lubrication cycle per shift once; Shaft speed > 200 r/min, the lubrication cycle every second.

The journal as uniform close contact with mobile crane bearing, and must fit clearance.

Refers to the journal and sliding bearing contact area of the central Angle. Contact Angle is not too big nor too small. Contact Angle is too small will make sliding bearing pressure increases, serious when they make the sliding bearing produces large deformation, accelerate wear, shorten service life. Contact Angle is too big, can affect the formation of oil film, can't get good fluid lubrication.

The choice of the Spherical roller bearings grease:

Load < 1 mpa, Spherical roller bearings shaft neck circumference speed below 1 m/s, the highest working temperature 75 ℃, choose 3 calcium base grease;

1-6.5 MPa, load speed shaft neck circumference of 0.5 5 m/s, the highest working temperature of 55 ℃, choose 2 calcium base grease;

Load > 6.5 MPa, Series radial ball bearings under the shaft neck circumference speed 0.5 m/s, the highest working temperature 75 ℃, choose 3 calcium base grease;

Load < 6.5 MPa, shaft neck circumference of 0.5 5 m/s speed, the highest working temperature 120 ℃, choose 2 lithium base grease;

Load > 6.5 MPa, under the shaft neck circumference speed 0.5 m/s, the highest working temperature 110 ℃, choose no. 2 - sodium calcium base grease;

Load, 1-6.5 MPa shaft neck circumference speed below 1 m/s, the highest working temperature is 50-100 ℃, choose 2 lithium base grease;

Load > 5 mpa shaft neck circumference speed 0.5 m/s, the highest working temperature 60 ℃, choose 2 calender fat;

In damp environment, temperature under the condition of 75-120 ℃, should consider to use calcium - sodium based grease grease. In damp environment, working temperature below 75 ℃, no 3 calcium base grease, can also be used aluminum base grease. Working temperature at 110-120 ℃, can use lithium base grease or barium base grease. Centralized lubrication, consistency to small.

The Deep groove ball bearing lubrication

Deep groove ball bearing is lubricated by grease to, when choosing grease should consider the following points:

(1) the bearing load, low speed, small grease should choose cone into the degree, on the other hand to choose large cone into the degrees. High-speed bearing Excavator Slewing Bearing

Sliding bearing

Use smaller cone into the degree, good mechanical stability of grease. Pay special attention to the lower the viscosity of base oil of the grease.

(2) the choice of grease drop point generally higher than the working temperature of 20-30 ℃, under the condition of high temperature continuous operation, be careful not to exceed the allowed to use the temperature range of the grease.

(3) sliding bearing in water or damp environment, should choose water resistance good calcium, aluminum or lithium base grease.

(4) has a good adhesion of grease.