Hand-held power tool with ratchet percussion mechanism

Abstract

An electric hand-held power tool ( 2 ) has a main housing ( 4 ) of a shell-type construction a tool spindle ( 14 ) projecting from the main housing ( 4 ) at a working tool-side end ( 18 ) of the housing and which can be rotated around a operational axis (A) by a motor ( 12 ) and a gear unit ( 16 ) which are accommodated in the main housing ( 4 ), with an axial percussion movements being applied to the tool spindle ( 14 ) by a ratchet percussion mechanism ( 38 ) having a toothed rim ( 43 ), which is fixed with respect to the housing and which is connected to a supporting body ( 44 ) that is supported in the main housing ( 4 ), the toothed rim ( 43 ) cooperating with a toothed rim ( 41 ) which is movable so as to be coupled with the tool spindle ( 14 ) for joint rotation therewith, and the supporting body ( 44 ) being supported by a supporting element ( 58 ) in a direction remote from the working tool-side end ( 18 ) of the housing, with the supporting element ( 58 ) being formed in a circumferentially extending manner at an inner surface ( 56 ) of an outer shell ( 34 ) of the main housing ( 4 ), and the supporting body ( 44 ) directly contacting the supporting element ( 58 ).

1 . Electric hand-held power tool ( 2 ), comprising a main housing ( 4 ) having a shell-type construction; a tool spindle ( 14 ) projecting form the main housing ( 4 ) at a working tool-side end ( 18 ) of the main housing ( 4 ) and rotatable around a operational axis (A) by a motor ( 12 ); a gear unit ( 16 ) which is accommodated in the main housing ( 4 ) and transmits a driving torque form the motor ( 12 ) to the spindle ( 4 ); a ratchet percussion mechanism ( 38 ) for applying a percussion movement to the spindle ( 4 ) and having a toothed rim ( 43 ) which is fixed with respect to the housing and which is connected to a supporting body ( 44 ) supported at the main housing ( 4 ), the toothed rim ( 43 ) cooperating with a toothed rim ( 41 ) which is connected with the tool spindle ( 14 ) for joint rotation therewith; supporting means ( 58 ) for supporting the supporting body ( 44 ) in a direction remote from the working tool-side end ( 18 ), the supporting means ( 58 ) being formed in a circumferentially extending manner at an inner surface ( 56 ) of an outer shell ( 34 ) of the main housing ( 4 ), and the supporting body ( 44 ) directly contacting the supporting means ( 58 ).  
   
   
       2 . A hand-held power tool according to  claim 1 , wherein the supporting body ( 44 ) has a radial contact surface ( 52 ) which contacts the outer shell ( 34 ) circumferentially in a radial direction.  
   
   
       3 . A hand-held power tool according to  claim 2 , wherein the radial contact surface ( 52 ) contacts the inner surface ( 56 ) at an axial height of a cylindrical outer surface ( 36 ) of the outer shell ( 34 ).  
   
   
       4 . A hand-held power tool according to  claim 1 , wherein the supporting body ( 44 ) has a sleeve-shaped base body ( 48 ) from which a plurality of support arms ( 50 ) project radially, the free ends of the support arms ( 50 ) forming a radial contact surface ( 52 ).  
   
   
       5 . A hand-held power tool according to  claim 1 , wherein the supporting body ( 44 ) is made of metal.  
   
   
       6 . A hand-held power tool according to  claim 1 , wherein the supporting body ( 44 ) is held at a gear unit housing ( 46 ).  
   
   
       7 . A hand-held power tool according to  claim 6 , wherein the supporting body ( 44 ) is cast integrally with the gear unit housing ( 46 ).  
   
   
       8 . A hand-held power tool according to  claim 1 , wherein a spindle bearing ( 49 ) is pressed into the supporting body ( 44 ).  
   
   
       9 . A hand-held power tool according to  claim 1 , wherein bearing recesses ( 54 ) for guiding slip clutch means ( 62 ) are incorporated in the supporting body ( 44 ).