关键词: 楔块, 重心位置, 接触力, 离合器性能

Abstract: In the working processes of the PCE type overrunning clutches, since the gravity center of the sprag did not coincide with its own rotation center, the centrifugal forces might generate a torque, which made the inertia torque of sprag change with the gravity center position, and might affect the working performance of the clutches. The gravity center position models of sprag were established by decomposition method and coordinate transformation herein. The dynamics model of the sprag clutches was established by ADAMS software. The sprag contact force, clutch engagement and disengagement performance at different gravity center were studied. The results show that when the gravity center is as 0.05 mm to the left of the rotation center, the contact force between the sprag and the inner-outer rings increases by 6% compared with that of 0.01 mm and the engagement time of the clutches raises 14%, which is beneficial to the engagement. When the gravity center position is as 0.05 mm to the right of the rotation center, the contact force between the sprag and the inner-outer rings reduces by 6% compared with that of 0.01 mm, the disengagement time of the clutches speeds up to 20%, and the disengagement performance may be better.

Key words: sprag, gravity center position, contact force, clutch performance