Direction of Radial Force in Internal Gear Meshing?

[DelHailey]

In internal gear meshing, the direction of radial force and the circumferential force act at the meshing point of the tooth profile on the pitch circle, passing through the centerline of the two gears. The circumferential force at the meshing point of the tooth profile on the pitch circle coincides with the common tangent of the two pitch circles. The radial force passes through the meshing point of the tooth profile, aligns with the centerline of the two pitch circles, points toward the center of the pitch circle, and is perpendicular to the circumferential force. Introduction to External Gear Meshing: External gear meshing involves two gears with external teeth. It mainly consists of a pair of bearings supporting the gears, along with a housing, front cover, and rear cover. The rotors rotate in opposite directions. The drive shaft extends from the front cover and is sealed by a shaft seal. External meshing also ensures good wear resistance, especially at low speeds. Internal sealing, achieved by a clamping force proportional to the discharge pressure, ensures optimal efficiency. Introduction to Internal Gear Meshing: Internal gear meshing involves one gear with external teeth and one with internal teeth (teeth inside a hole). The meshing of these two gears is called internal meshing. Internal gear pumps include involute gear pumps and cycloidal gear pumps (also known as rotor pumps). The advantages of internal gear pumps are compact structure, small size, light weight, long service life, low pressure pulsation, and low noise. The disadvantages are complex tooth profiles, high machining accuracy requirements, and higher costs.