Bearings - Ondrives - #39

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Text version of the page
CU A ETC
BEARINGS
Spherical Bearings
1. When the load acts in YL direction;
Select the housing material considering the compressive stress obtained from the following formula.
«-4.....................................................
Maintenance-free spherical bushings can be used without lubrication. However, if a lithium soap based grease is supplied before operation, the spherical bushings can be operated for an extended period of time. The spherical bushings can be effectively protected from dust and rust, if the space around the bushings is filled with grease.
Mounting
1. When mounting spherical bushings, it is necessary to pay special attention to the location of the split plane of outer ring. Set the split plane at right angles to the direction of load so as to avoid the application of load to the split portion.
2. The shoulder dimensions of shaft and housing are shown in the dimension tables.
Maximum compressive stress occurring in the housing bore kgf/mm2 F : Applied load kgf C : Width of outer ring and housing mm D : Outside diameter of outer ring mm
2. When the load acts in Yu direction;
Select the housing material considering the tensile stress obtained from the following formula.
F
Load
02 = CW-D) L
Split plane
Relationship between the split plane and the loading direction
where, ¿2 :
Maximum tensile stress occurring in the
housing bore kgf/mm2
F :
Applied load kgf
C :
Width of outer ring and housing mm
DH:
Outside diameter of housing mm
D :
Outside diameter of outer ring mm
k :
Stress concentration factor
(refer to graph below)
When the inner and outer rings are assembled at the same time
When setting the interference side
Mounting Examples
0123456789 DH/D
Stress Concentration Factor Lubrication
Steel-on-steel spherical bushings can be operated without lubrication when the magnitude of applied load is small and the sliding velocity of oscillation is very small. However, in general, it is necessary to supply grease periodically. During the initial operation, it is recommended to shorten the lubrication interval. Lithium soap based grease containing MoS2 with a consistency of NLGI 2 is widely used as the lubricating grease.
ondrives
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pageCatalog pdf di En 2012-05-22-31