Abstract: A joint structure includes: a first member having a cylindrical first inner surface extending along a predetermined axis; a second member having a cylindrical outer surface disposed coaxially with the first inner surface; a first seal that seals annular gap between the first inner surface and the outer surface while allowing relative rotation of the first member and the second member about the axis; a third member having a second inner surface disposed coaxially with the first inner surface and detachably attached to the first member on an outer side of a sealing position sealed with the first seal; and a second seal that is press-fitted into the second inner surface and that seals annular gap between the second inner surface and the outer surface while allowing relative rotation of the first member and the second member about the axis.

Abstract: Robot sealing structure includes a shaft end face of a shaft of a reducer, an attachment surface of an arm member, bolts for fixing the shaft and the arm member to each other, and a seal member arranged between the shaft end face and the attachment surface, a hollow hole including a center axis line of the shaft is provided in the shaft end face, an input gear housing portion for housing an input gear, and a gear housing portion for housing a gear driven by the input gear are provided in a periphery of the hollow hole, the periphery of the hollow hole is provided with a protruding portion formed between the input gear housing portion and the gear housing portion, and a hole for temporarily attaching or fixing the seal member in the protruding portion is provided.

Abstract: Robot sealing structure includes a shaft end face of a shaft of a reducer, an attachment surface of an arm member, bolts for fixing the shaft and the arm member to each other, and a seal member arranged between the shaft end face and the attachment surface, a hollow hole including a center axis line of the shaft is provided in the shaft end face, an input gear housing portion for housing an input gear, and a gear housing portion for housing a gear driven by the input gear are provided in a periphery of the hollow hole, the periphery of the hollow hole is provided with a protruding portion formed between the input gear housing portion and the gear housing portion, and a hole for temporarily attaching or fixing the seal member in the protruding portion is provided.