Two application areas of INA one-way clutch bearings
1. Working principle of one-way clutch INA bearing
One-way clutch bearing is a type of INA bearing, which is characterized by the function of one-way rotation and reverse stop. It is widely used in one-way clutches of washing machines, one-way clutches of automobiles and one-way clutches of electric vehicles.
The one-way clutch INA bearing unit is generally composed of INA ball bearings and wedge-type one-way clutches. The ball bearings bear the radial force and the wedge bears the torque. The combination realizes the functions of one-way rotation, swing indexing, forward and backward and overrunning. Because of its compact structure, reliable wedging and large torque transmission, it can meet the needs of the main machine functionalization, componentization and small assembly space.
(1) Principle of torque transmission
The special-shaped wedges are evenly distributed on the circumference of the cage, and under the action of the band spring force, the special-shaped wedges are always kept in contact with the inner and outer rings. Because the maximum height of the special-shaped wedge is greater than half of the difference between the inner diameter of the outer ring and the outer diameter of the inner ring, it is often inclined in the working surface of the inner and outer rings. When the outer ring rotates clockwise, the contact surface between the outer ring and the special-shaped wedge generates friction. For the center of each special-shaped wedge, a rightward tilting moment is generated, and the inner and outer rings are strongly meshed with it to transmit torque.When the outer ring rotates counterclockwise, the center of the various wedges tilts to the left, the inner and outer rings are unwedge, and the outer ring is idling.
(2) Rated torque and idling torque
a. Rated torque: The rated torque of the one-way clutch is measured by the fatigue strength of the meshing surface of the special-shaped roller. Therefore, the repeated rated torque of the one-way clutch refers to the ultimate torque at which the meshing surface cannot produce slippage and harmful plastic deformation, and after 106 times of clutching, there will be no fatigue spalling on the special-shaped wedges and inner and outer ring track surfaces. Since the internal stress generated by the meshing surface is larger on the outer ring side than on the inner ring side, the compressive stress on the inner ring side should be used as a condition when calculating the rated torque.