Bevel gear unit and a wrist mechanism for an industrial robot in

Details Bevel gear unit and a wrist mechanism for an industrial robot in Bevel gear unit and a wrist mechanism for an industrial robot in

1991-12-16

1992-07-07

Herrmann, Allan D.

Machine element or mechanism

Gearing

Directly cooperating gears

74423, 74665M, 901 26, 901 29, F16H 120, B25J 1100

Patent

active

051272822

ABSTRACT:
A bevel gear unit comprising a bevel gear (11), a ball bearing (B.sub.1) coaxially mounted on the shaft of the bevel gear (11) and in contact with the back surface (17) thereof, a double spacer including an inner race spacer (12) and an outer race spacer (13) and mounted on the shaft of the bevel gear (11) behind the ball bearing (B.sub.1), ball bearings (B.sub.2, B.sub.3) mounted on the shaft of the bevel gear (11) behind the double spacer, and a bearing nut (15) screwed onto a threaded portion of the shaft of the bevel gear (11) behind the ball bearings (B.sub.2, B.sub.3). The axial length (l.sub.1) of the inner race spacer (12) is made smaller than the axial length (l.sub.2) of the outer race spacer (13) by a preloading allowance (.delta.), and the outer race spacer (13) is provided with threaded holes (t.sub.1) in the rear surface (f.sub.1) thereof. When applied to a mechanism having a plurality of coaxial bevel gears, particularly, to a wrist mechanism for an industrial robot, the bevel gear unit facilitates the preloading of the bearings.

REFERENCES:
patent: 1493175 (1924-05-01), Wolf
patent: 2241606 (1941-05-01), Kysor
patent: 3143004 (1964-08-01), Haskin, Jr.
patent: 3943789 (1976-03-01), Mann
patent: 4068536 (1978-01-01), Stackhouse
patent: 4594918 (1986-06-01), Kimura et al.
patent: 4807486 (1989-02-01), Akeel et al.
patent: 4823279 (1989-04-01), Perzley et al.

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