Rod Ends / Spherical Bearings
32Pages

Heavy-Duty Rod Ends and Spherical Bearings To DIN ISO 12240-4/12240-1 and CETOP

Carl Hirschmann GmbH Pole position in spherical bearing technology In light weight construction we are in the pole position since years. Our heavy-duty spherical bearings and rod ends convince with maximum load capacity at minimum weight. With great passion and deep special know-how we develop and produce trend-setting spherical bearing technology for your ambitious requirements. As branch innovator we inspire with high performance competence in solutions and progressive conceptional results. Carl Hirschmann – the precision benchmark We are the leading manufacturer in spherical bearing...

Contents Contents Technical notes Checking bearing size Determining bearing size Calculation examples Relubricatable heavy-duty rod ends Maintenance-free heavy-duty rod ends Relubricatable and maintenance-free heavy-duty rod ends for pneumatic cylinders Relubricatable and maintenance-free heavy-duty spherical bearings Sealed rod ends and spherical bearings Threaded bolts for rod ends and spherical bearings Maintenance-free aluminum- titanium lightweight bearings Maintenance-free heavy-duty rod ends with female thread in inch dimensions Maintenance-free heavy-duty rod ends with male thread...

Overview Standard solutions Special solutions

Selection Construction Series Design features SFC.. Relubricatable heavy-duty SMC.. design, rod ends SSC.. and spherical bearings Friction pairing: Steel/heavy-duty bronze, with precision-turned bushing having extremely high lining adjustment capability. SFCP.. Maintenance free SMCP.. heavy-duty rod ends SSCP.. and spherical bearings Friction pairing: Steel/PTFE bronze fabric. The sliding film is affixed inside the bushing. This ensures long service life. Application features Universal application at high alter- nating and shock loads in radial and axial directions. Suitable for large...

Technical notes Bearing slackness Bearing slackness or bearing clearance is the dimension by which the inner ring can be moved within the bushings in a radial or axial direction when not installed and unlubricated. Rod ends and spherical bearings are manufactured with differing bearing slackness, as shown in the following charts, depending on the friction pairing and the size of the bearing. When mounting bearings, please note that the slackness can be reduced to zero if necessary, due to possible differences in tolerance (bearing diameter to housing bore hole). The test load is 100 N. It...

Operating temperature Bearing capacities All designs can be used without restriction in a temperature range from –30° C to +120° C. Increasing the operating temperature reduces the bearing power and thus the service life. Operation at high temperature of relubricatable rod ends and spherical bearings depends to a very great extent on whether the high-temperature lubricating grease used offers sufficient lubricity at high operating temperatures. These designs could be used in the short term under low load and with suitable lubrication at temperatures up to +250° C. The maintenance-free...

Checking bearing size The inner ring carries out a swinging or pivoting movement in relation to the bushing. If there is also a constant axial load acting, P is calculated as follows: P = Fm + Y · Fa To check a bearing size with regard to its static and dynamic load-bearing capacity, the bearing must be investigated to the following criteria: • Constant dynamic load • Variable dynamic load • Static load The equivalent bearing loads are calculated from Fr and Fa. Dynamic load In addition Fmax must be checked for static safety. < Fmax ‗ Pperm. Constant dynamic load For Pperm. see “Permissible...

Very low loads or running speeds result in a relatively high arithmetic service life. In practice, with a longer service life, environmental influences can acquire importance and lead to an error in the results. Type of load invariable Time Material factor b3  –– –– –  Maintennace-free bearing –––––– Lubricated bearing variable Time The values written in brackets are valid for rod ends with male threads and lubricating nipples or lubrication holes. < P ‗ Pperm. The service life of a rod end or spherical bearing is a function of several factors, some of which are difficult to determine. A...

Determining bearing size ¯ The insertion of the relative service life Gh as auxiliary quantity enables a correlation between the relative service life and the dynamically equivalent bearing load to be represented graphically. ¯ Relative service live Gh [h] Lubricated design The following equation applies for the relative service life: ˉ Gh = Gh · ß · f b 1 · b2 ˉ Gh = relative service life Gh = required service life ß   = swing angle f   = swing frequency b1 = load direction factor (Fig. 12) b2 = temperature factor (Fig. 12) Example A rod end with male thread is required for the following...

Calculation examples Example 1 The conveying lever on a packaging machine is to be moved via a rod end. The designs calls for a size 12 rod end. Values dictated by design: 1200 N Alternating constant dynamic radial load Fr Swing angle ß 30° Swing frequency f 120 min-1 Operating temperature 50° C Since the load is alternating and constant, a lubricated design is recommended according to the section “Selection” (page 5), e.g. SMC 12. Catalogue values: Dynamic bearing capacity C 13400 N Static bearing capacity Co 17000 N Inner ring Ø K 22,225 mm A lever of a filling machine is moved via a...

Relubricatable heavy-duty rod ends with female thread Friction pairing steel on heavy-duty bronze B d2 C Material Series SFC.. Outer part: Up to size 14 free-cutting steel 1.0718, from size 16 material 1.0501, galvanized and chromalized to DIN 50961. Bushings: Cu Sn 8/Cu Zn 40 Al 2 F59, 2.0550.31. Inner ring: Roller bearing steel 1.3505, hardened, ground and polished. Series SFXC.. (available from size 5) Outer part: Material 1.7225 tempered or similar, galva nized and chromalized to DIN 50961. Bushings: As for SFC.. Inner ring: As for SFC.. Series SFRC.. (available from size 3) Outer part:...