Gearwheel and method for manufacturing a gearwheel

Abstract

Gearwheel and method for manufacturing a gearwheel The invention concerns a gearwheel ( 1 ) with an external part ( 2 ), an insert ( 3 ), and a connecting part ( 4 ) for creating a form-fitting connection between the external part ( 2 ) and the insert ( 3 ), wherein the connecting part ( 4 ) is made from a material molded between the external part ( 2 ) and the insert ( 3 ). According to the method, the invention concerns a method for manufacturing a gearwheel ( 1 ), in which an external part ( 2 ) and an insert ( 3 ) are form-fittingly connected to a connecting part ( 4 ), wherein the minimum of one such connecting part ( 4 ) is molded between the external part ( 2 ) and the insert ( 3 ).

1 . Gearwheel ( 1 ) with 
 an external part ( 2 ),    an insert ( 3 ) and    a connecting part ( 4 ) for creating a form-fitting connecting between the external part ( 2 ) and the insert ( 3 ),    characterized in that    the minimum of one connecting part ( 4 ) is made from material molded between the external part ( 2 ) and the insert ( 3 ).    
   
   
       2 . Gearwheel ( 1 ) according to  claim 1 , in which the insert ( 3 ) is made of metal and the external part ( 2 ) is made of plastic.  
   
   
       3 . Gearwheel ( 1 ) according to  claim 1 , in which the connecting part ( 4 ) is made of an injection molding material containing plastic.  
   
   
       4 . Gearwheel ( 1 ) according to  claim 1 , in which the connecting part ( 4 ) is made from a material harder and/or more torque-proof than the material of the external part ( 2 ).  
   
   
       5 . Gearwheel ( 1 ) according to  claim 1 , in which the connecting part ( 4 ), with gear tooth structures ( 42 ,  43 ) that prevent pulling in the rotational direction and/or in a direction parallel to the axis, engages with the insert ( 3 ) and/or the external part ( 2 ).  
   
   
       6 . Method of manufacturing a gearwheel ( 1 ), in which an external part ( 2 ) and an insert ( 3 ) are form-fittingly connected to a connecting part ( 4 ), characterized in that 
 the minimum of one such connecting part ( 4 ) is molded between the external part ( 2 ) and the insert ( 3 ).    
   
   
       7 . Method according to  claim 6 , in which the connecting part ( 4 ) is molded with a cone gate ( 46 ) between the external part ( 2 ) and the insert ( 3 ).  
   
   
       8 . Method according to  claim 6 , in which the external part ( 2 ) is provided with external teeth prior to molding.  
   
   
       9 . Method according to  claim 6 , in which the insert ( 3 ) is provided with external gear tooth structures ( 42 ,  43 ) prior to molding.  
   
   
       10 . Method according to  claim 6 , in which the connecting part ( 4 ) is molded from a direction parallel to the axis(X) between the external part ( 2 ) and the insert and subsequently a lateral cone gate ( 46 ) is removed.  
   
   
       11 . Method according to  claim 6 , in which the connecting part ( 4 ) is molded under pressure that exerts an outward force on the external part ( 2 ).  
   
   
       12 . Method according to  claim 6 , in which the connecting part ( 4 ) is molded from a reinforced plastic.