Patent ID: 8096857
Filing Date: 2012-01-17
Classification: B24B,B25F

Abstract:
1. A power tool, in particular a right-angle grinder, comprising: a housing; a motor that is an independent, fully functional component group which is supported in said housing via a damping unit; and a gear that is an independent, fully functional component group that is configured to be combined with other component groups; wherein said gear comprises a gear box and a gear input shaft supported in said gearbox via at least one detent connection, wherein said gear comprises a fan guide wheel, that forms said unit to fix said gear input shaft in said gearbox, and a subsidiary component group that comprises a pinion shaft, a pinion, a ball bearing, and a fan, wherein said fan guide wheel is pressed into said gearbox and fixed with tabs, wherein said tabs correspond with hooks on said gearbox to form said at least one detent connection to fix said unit embodied as said fan guide wheel in said gearbox, and wherein said subsidiary component group is clipped into said fan guide wheel to form said gear together with said gearbox, wherein said motor and said gear are connected via a coupling, wherein said coupling comprises a toothed bush, wherein said toothed bush is connected by non-positive, positive, or a combination of positive and non-positive engagement to an armature shaft of said motor, wherein said coupling further comprises an internal toothing that is integrated with said fan which is press-fitted onto the gear input shaft, wherein said toothed bush comprises radial extensions extending perpendicular to a rotation axis of the toothed bush, wherein the radial extensions are uniformly arranged along a circumferential direction of the toothed bush which extends in a plane perpendicular to the rotation axis, wherein said radial extensions are provided for engagement with said internal toothing, wherein said internal toothing and said toothed bush are dimensioned such that between the internal toothing and said toothed bush, defined running play is formed in a radial direction that is perpendicular to said rotation axis of said toothed bush to compensate an axial offset between said armature shaft and said gear input shaft, and wherein said toothed bush is shaped spherical to enable compensating for an angular offset between said armature shaft and said gear input shaft.