Hand-held power tool hammer mechanism

Abstract

A hand-held power tool hammer mechanism, having a hammer device ( 10 a - 10 k ), which can be driven by means of a piston ( 12 a - 12 k ) via a gas volume ( 14 a - 14 k ). A hammer mechanism characteristic value (S a -S k ), which is composed of the maximum hammer device surface dimension ( 16 a - 16 k ), cubed and divided by the hammer device mass ( 18 a - 18 k ), is greater than 200 mm 3 /g, preferably greater than 220 mm 3 /g, and particularly preferably greater than 240 mm 3 /g.

1 . A hand-held power tool hammer mechanism having a hammer device ( 10   a - 10   k ), which can be driven by means of a piston ( 12   a - 12   k ) via a gas volume ( 14   a - 14   k ), 
 wherein a hammer mechanism characteristic value (Sa-Sk), which is composed of the maximum hammer device surface dimension ( 16   a - 16   k ), cubed and divided by the hammer device mass ( 18   a - 18   k ), is greater than 200 mm 3 /g, preferably greater than 220 mm 3 /g, and particularly preferably greater than 240 mm 3 /g.    
   
   
       2 . The hand-held power tool hammer mechanism as recited in  claim 1 , 
 wherein the hammer mechanism characteristic value (Sa-Sk) is greater than 280 mm 3 /g, preferably greater than 320 mm 3 /g, and particularly preferably greater than 380 mm 3 /g.    
   
   
       3 . The hand-held power tool hammer mechanism as recited in  claim 1  or  2 , 
 wherein the hammer mechanism characteristic value (Sa-Sk) is less than 2000 mm 3 /g.    
   
   
       4 . The hand-held power tool hammer mechanism as recited in the preamble to  claim 1  and in particular as recited in one of the preceding claims, 
 wherein a maximum gas pressure in the gas volume ( 14   a - 14   k ) is less than 10 bar, advantageously less than 8 bar, and particularly advantageously less than 6 bar.    
   
   
       5 . The hand-held power tool hammer mechanism as recited in one of the preceding claims, 
 characterized by means of an eccentric drive mechanism ( 20   a ) supported at one end.    
   
   
       6 . The hand-held power tool hammer mechanism as recited in one of the preceding claims, 
 characterized by means of a hammer mechanism transmission ( 22   a ) comprised exclusively of spur gear teeth.    
   
   
       7 . The hand-held power tool hammer mechanism as recited in one of the preceding claims, 
 characterized by means of at least one control opening ( 24   a ) that is provided to control the gas volume ( 14   a ) and is coupled to a motor compartment ( 26   a ).    
   
   
       8 . The hand-held power tool hammer mechanism as recited in one of the preceding claims, 
 wherein the hammer device ( 10   b - 10   g ) has at least one decoupling means ( 28   b - 28   g ), which is provided for dimensionally decoupling a main hammer body ( 30   b - 30   g ) of the hammer device ( 10   b - 10   g ), and has a coupling ( 34   b - 34   g ) between the decoupling means ( 28   b - 28   g ) and the main hammer body ( 30   b - 30   g ), which is provided to couple the main hammer body ( 30   b - 30   g ) to the decoupling means ( 28   b - 28   g ) in an at least largely synchronous fashion during a flight phase of the main hammer body ( 30   b - 30   g ).    
   
   
       9 . The hand-held power tool hammer mechanism as recited in  claim 8 , 
 wherein the decoupling means ( 28   b - 28   e ) is provided to at least partially decouple an outer dimension of the main hammer body ( 30   b - 30   e ) from a guide means ( 32   b - 32   e ) of the hammer device ( 10   b - 10   e ).    
   
   
       10 . The hand-held power tool hammer mechanism as recited in  claim 8  or  9 , wherein the decoupling means ( 28   b - 28   g ) is manufactured out of a lighter material than the main hammer body ( 30   b - 30   g ).  
   
   
       11 . The hand-held power tool hammer mechanism at least as recited in  claim 9 , 
 wherein the coupling ( 34   b - 34   e ) and/or the decoupling means ( 28   b - 28   e ) is/are embodied to exert an at least partial vibration-damping action.    
   
   
       12 . The hand-held power tool hammer mechanism as recited in  claim 11 , wherein the coupling ( 34   b ) includes at least one connection that is manufactured by being vulcanized in place.  
   
   
       13 . The hand-held power tool hammer mechanism at least as recited in  claim 8 , 
 wherein the decoupling means ( 28   b - 28   e ) has at least one guide surface ( 36   b - 36   e ,  38   b - 38   e ).    
   
   
       14 . The hand-held power tool hammer mechanism as recited in  claim 13 , 
 wherein the decoupling means ( 28   c ) has at least two guide surfaces ( 36   b ,  38   b ) spaced apart from each other in the axial direction.    
   
   
       15 . The hand-held power tool hammer mechanism as recited in one of the preceding claims, 
 wherein the hammer device ( 10   i ) has at least one guide rib ( 40   i ,  42   i ).    
   
   
       16 . The hand-held power tool hammer mechanism as recited in one of the preceding claims, 
 wherein the hammer device ( 10   d ,  10   e ,  10   h ) is embodied as stepped.    
   
   
       17 . A hand-held power tool equipped with a hand-held power tool hammer mechanism as recited in one of the preceding claims.