Surface speed of iglidur materials

Table 01: Maximum recommended surface speeds (long-term) of iglidur plain bearing in m/s

Material	Rotating	Oscillating	linear
Standards
iglidur® G	1	0,7	4
iglidur® J	1,5	1,1	8
iglidur® M250	0,8	0,6	2,5
iglidur® W300	1	0,7	4
iglidur® X	1,5	1,1	5
General purpose
iglidur® K	1	0,7	3
iglidur® P	1	0,7	3
iglidur® GLW	0,8	0,6	2,5
The endurance runner
iglidur® J260	1	0,7	3
iglidur® J3	1,5	1,1	8
iglidur® J350	1,3	1	4
iglidur® L250	1	0,7	2
iglidur® R	0,8	0,6	3,5
iglidur® D	1,5	1,1	8
iglidur® J200	1	0,7	10
High temperatures
iglidur® V400	0,9	0,6	2
iglidur® X6	1,5	1,1	5,4
iglidur® Z	1,5	1,1	5
iglidur® UW500	0,8	0,6	2
High media resistance
iglidur® H	1	0,7	3
iglidur® H1	2	1,0	5
iglidur® H370	1,2	0,8	4
iglidur® H2	0,9	0,6	2,5
Contact with food
iglidur® A180	0,8	0,6	3,5
iglidur® A200	0,8	0,6	2
iglidur® A350	1	0,8	2,5
iglidur® A500	0,6	0,4	1
iglidur® T220	0,4	0,3	1
Special applications
iglidur® F	0,8	0,6	3
iglidur® H4	1	0,7	1
iglidur® Q	1	0,7	5
iglidur® A290	1	0,7	3
iglidur® UW	0,5	0,4	2
iglidur® B	0,7	0,5	2
iglidur® C	1	0,7	2

Table 02: Maximum recommended surface speeds (short-term) of iglidur plain bearings in m/s

Material	Rotating	Oscillating	linear
Standards
iglidur® G	2	1,4	5
iglidur® J	3	2,1	10
iglidur® M250	2	1,4	5
iglidur® W300	2,5	1,8	6
iglidur® X	3,5	2,5	10
General purpose
iglidur® K	2	1,4	4
iglidur® P		1,4	4
iglidur® GLW	1	0,7	3
The endurance runner
iglidur® J260	2	1,4	4
iglidur® J3	3	2,1	10
iglidur® J350	3	2,3	8
iglidur® L250	1,5	1,1	3
iglidur® R	1,2	1	5
iglidur® D	3	2,1	10
iglidur® J200	1,5	1,1	15
High temperatures
iglidur® V400	1,3	0,9	3
iglidur® X6	3,5	2,5	10
iglidur® Z	3,5	2,5	6
iglidur® UW500	1,5	1,1	3
High media resistance
iglidur® H	1,5	1,1	4
iglidur® H1	2,5	1,5	7
iglidur® H370	1,5	1,1	5
iglidur® H2	1	0,7	3
Contact with food
iglidur® A180	1,2	1	5
iglidur® A200	1,5	1,1	3
iglidur® A350	1,2	0,9	3
iglidur® A500	1	0,7	2
iglidur® A290	2	1,4	4
iglidur® T220	1	0,7	2
Special applications
iglidur® F	1,5	1,1	5
iglidur® H4	1,5	1,1	2
iglidur® Q	2	1,4	6
iglidur® UW	1,5	1,1	3
iglidur® B	1	0,7	3
iglidur® C	1,5	1,1	3

Surface speed

The peripheral speed is always significant in plain bearings. Crucial is not the absolute rotary speed, but the relative speed between the shaft and the bearing. The surface speed is expressed in meters per second [m/s] and calculated from the rotary speed n [rpm] with the following formula. Rotations: v = n * d1 * π/(60 * 1000) [m/s] Pivoting motions: v = d1 * π * 2*β/360 * f/1000 [m/s] Present is

d1	Inner diameter of bearing [mm]
f	Frequency [s]
β	Angle [°]
n	Revolutions per minute

In varying speeds, like it happens in pivoting motions for example, the average surface speed v is standard (see the above-mentioned formula).

Permitted surface speeds

iglidur plain bearings have been developed for low to medium surface speeds in continuous operation.
 
Table 01 and Table 02 show the permissible surface speed of iglidur plain bearings for rotating, pivoting, and linear movements.
 
These surface speeds are limit values assuming minimal pressure loading of the bearing.
In practice these limit values are not often reached due to the alternating effect of influences. Each increase in compressive force leads unavoidably to a reduction of the permissible surface speeds and vice versa.
 
The speed limit is determined by the thermal properties of the bearing. This is also the reason why different surface speeds can occur for the different movement types.
For linear movements, more heat can be dissipated via the shaft, since the bearing uses a longer surface area on the shaft.
 

Surface speed and wear

Considerations of the permitted surface speeds should always also include the wear resistance of the bearing. High surface speeds automatically bring in correspondingly high glide paths. With the surface speed, it thus increases not only the wear rate, but also the absolute wear in total.

Surface speed and coefficient of friction

In practice the coefficient of friction of plain bearings is a result of the surface speed. High surface speeds have a higher coefficient of friction than low surface speeds. Diagram 01 shows this relationship by using the example of a steel shaft (Cf53) with a load of 0.7MPa.
 

 
 

Diagram 01: Coefficients of friction of iglidur materials for different surface speeds (shaft Cf53 rotating)