The performance analysis of the single row ball slewing bearing structure is as follows:
Contact point position: The contact point position is close to the theoretical position which conforms to the force state.
Contact length: point contact, in line with theoretical calculations.
Stress distribution: point contact, in line with theoretical calculations.
Movement of the rolling elements: only rolling.
Rotary resistance torque: only rolling, low rotary resistance.
Machining form: The structure is two-ring type, and the machining amount is small; but the double-arc raceway requires special tools and special processing.
Rigidity: Good rigidity, low deformation, and slightly lower requirements for mounting brackets.
Rolling body: Steel balls are cheap and easy to match.
Dynamic capacity characteristics: The theoretical calculation of dynamic capacity is smaller than the cross-roller slewing bearing, but it can reach the theoretical value and is not a limiting condition internationally.
The performance analysis of single row cross roller slewing bearing structure is as follows:
Contact point position: The design requires that the contact point between the rolling element and the raceway is located in the middle of the raceway. Due to the taper angle error and the assembly clearance, the contact point position deviates from the midpoint of the raceway, which makes the raceway unfavorable.
Rotary resistance torque: The roller is in a rolling state with a rolling belt. The larger energy is used for wear, and the rotary resistance torque is twice of the single row ball type.
Processing form: The structure is three-ring type, one more blank, and the processing volume is large; but the right-angled raceway can be processed by ordinary lathe and general processing tools.
Rigidity: Poor rigidity and large deformation require high degree of flatness and inclination of the mounting bracket.
Rolling body: The roller is more expensive and the matching is more difficult.
Dynamic capacity characteristics: large dynamic capacity, 50% larger than single row ball type. However, since the contact length and stress distribution cannot reach the theoretical calculation value, the actual dynamic capacity is only about 1/3 of that of a single row ball type.