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AssigneeRicoh Company, Ltd.
InventorsMasahiro Ishida, Shinya Shimizu, Naoki Matsuda
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A gear transmission device includes a first external gear driven by a drive motor attached to a first side of a frame and a first internal gear driven by the first external gear. The first internal gear includes an outer cylinder portion, an end plate, an annular opening, and an inner cylinder portion including a shaft hole. The outer cylinder portion includes internal teeth formed on an inner circumferential surface thereof. The inner cylinder portion is formed concentrically inside the outer cylinder portion. The end plate connects the outer cylinder portion, the inner cylinder portion, and the shaft hole at one end in an axial direction. In a state in which the annular opening faces a second side of the frame opposite the first side thereof, the first external gear is inserted to the annular opening to mesh with the internal teeth of the outer cylinder portion.
1-14. (canceled)
A power transmission device, comprising:
The power transmission device according to claim 1, further comprising:
The power transmission device according to claim 1, wherein the second driven rotatable gear is configured to transmit power from the drive motor to an image bearing member.
The power transmission device according to claim 1, wherein a side of the first frame facing the annular concave portion includes an annular rib configured to surround at least a portion of an outer circumference of the first driven rotatable gear.
The power transmission device according to claim 1, wherein the first driven rotatable gear is a deceleration gear.
The power transmission device according to claim 1, further comprising:
The power transmission device according to claim 6, wherein a diameter of the external gear is smaller than that of the internal teeth portion of the first driven rotatable gear.
The power transmission device according to claim 1, wherein the first external teeth of the rotary shaft and the internal teeth portion of the first driven rotatable gear include helical gears, and an angular direction of the helical gears is set such that a drive torque acting on the helical gears biases the first driven rotatable gear towards the side of the frame facing the annular concave portion.
The power transmission device according to claim 1, further comprising:
The power transmission device according to claim 1, wherein an end portion of the first driven rotatable gear opposite the drive motor includes a hole that is configured to allow access to the rotary shaft.
An image forming apparatus, comprising:
Dependencies are inferred from the claim text.