Can Left-Hand Helical Gears and Right-Hand Helical Gears Mesh Together?

1 Answers
DelIsabel
07/30/25 8:05am
Yes, they can mesh. For external meshing, a pair of helical gears must have opposite helix directions; for internal meshing, they must have the same helix direction. Rotation Direction: In parallel-axis cylindrical helical gear transmission, the two gears must have equal helix angles but opposite directions—one left-hand and the other right-hand. When the gear centerline is placed vertically, the near end to the observer shows that the left side with higher teeth is the left-hand gear, while the right side with higher teeth is the right-hand gear. The driving gear's rotation direction and the gear's helix angle direction determine the axial force direction. Helical Gear and Rack Assembly: Ensure the center distance between the gear and the rack is correct. It is also preferable to ensure that the gear's tooth width is greater than the rack's tooth width.
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