Static characteristics of a new hydrodynamic–rolling hybrid bearing

An analytic model is developed to predict static characteristics of a new hydrodynamic–rolling hybrid bearing (HRHB). Experiments are carried out to measure the equilibrium positions, the load sharing, and the rotational speeds of the rolling bearing cage. The results show that the working states of HRHB are divided into two distinct phases by a transition speed at which the hydrodynamics and contact models are decoupled. The cage speeds can be used to determine transition speed. The theoretical results agree with the experimental results, and it can be employed to design the bearing parameters according to the expected performance.

► An analytic model was developed to predict the static characteristics of new HRHB.
► A transition speed divides the working states of HRHB into two distinct situations.
► HRHB has unique static characteristics below the transition speed.
► Rolling bearing reaction decreases with the increase of the oil film force.
► Cage speed is response to the load sharing on the rolling bearing.