Bevel gear unit and a wrist mechanism for an industrial robot incorporating the same

A bevel gear unit comprising a bevel gear (11), a ball bearing (B1) 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 (1...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TORII, NOBUTOSHI, IWASAKI, KYOZI, MIZUNO, HITOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	BEARINGS BLASTING CHAMBERS PROVIDED WITH MANIPULATION DEVICES ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HAND TOOLS HEATING LIGHTING MANIPULATORS MECHANICAL ENGINEERING PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A bevel gear unit comprising a bevel gear (11), a ball bearing (B1) 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 (B1), ball bearings (B2, B3) 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 (B2, B3). The axial length (l1) of the inner race spacer (12) is made smaller than the axial length (l2) of the outer race spacer (13) by a preloading allowance ( delta ), and the outer race spacer (13) is provided with threaded holes (t1) in the rear surface (f1) 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.