Worm support device and power assist unit having the same

Details Worm support device and power assist unit having the same Worm support device and power assist unit having the same

F - Mech Eng,Light,Heat,Weapons

16

C

F16C 19/06 (2006.01) B62D 5/04 (2006.01) F16C 19/16 (2006.01) F16C 19/54 (2006.01) F16C 33/32 (2006.01) F16C 33/58 (2006.01) F16C 35/063 (2006.01) F16H 1/16 (2006.01) F16H 57/02 (2006.01)

Patent

CA 2507935

Deep groove ball bearings are used as bearings (20, 30) supporting both side portions of a worm (14) that continues to a motor (10). In a first bearing (20) on the motor (10) side, curvature radii (R1, R2) of raceway grooves (21a, 22a) of an inner and an outer ring (21, 22), respectively, are set in a numerical range that satisfies at least either a first condition where the curvature radius (R1) is between 52.5% or more and 75% or less of a diameter (r) of a ball (23) or a second condition where the curvature radius (R2) is between 53.5% or more and 85% or less of the diameter (r) of a ball (23).

Des roulements à billes à gorges profondes sont utilisés comme paliers (20, 30) pour le support des deux portions latérales d'une vis (14) qui s'étend jusqu'à un moteur (10). Dans un premier palier (20) du côté moteur (10), des rayons de courbure (R1, R2) de gorges de chemin de roulement (21a, 22a) d'une bague intérieure et d'une bague extérieure (21, 22), respectivement, sont disposées en une plage numérique qui satisfait au moins soit une première condition où le rayon de courbure (R1) est compris entre un minimum de 52,5 % et un maximum de 75 % d'un diamètre (r) d'une bille soit une deuxième condition où le rayon de courbure (R2) est compris entre un minimum de 53,5 % et un maximum de 85 % du diamètre (r) d'une bille (23).

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