Method and device for producing gear plates for a continuously variable gearbox

Abstract

The invention relates to a method for producing gear plates ( 1 ) for a continuously variable gearbox wherein at least two gear plates ( 1 ) with the transmission surfaces ( 2 ) thereof are arranged in an opposite mauler. When the gearbox is in operation, said transmission surfaces come into contact in a non-positive mode with a power transmission element, on a device comprising at least one workpiece spindle ( 3 ) and a grinding disc ( 4 ) which is driven by a grinding spindle ( 5 ) in order to grind the transmission surface ( 2 ) of at least one gear plate ( 1 ). During the grinding of the transmission surface ( 2 ), a repeated relative oscillating movement is carried out radially in relation to the workpiece spindle ( 3 ), between the grinding disc ( 4 ) and the gear plate ( 1 ), in such a way that the grinding region of the grinding disc ( 4 ) is moved back and forth between an inner radius ( 2.1 ) and an outer radius ( 2.2 ) of the transmission surface ( 2 ). The gear plate ( 1 ) is rotated by means of the workpiece spindle ( 3 ) in such a way that the entire transmission surface ( 2 ) is ground.

1 . (canceled)  
   
   
       2 . The method of  claim 21 , comprising executing said coordinating so that a cross-grind of a predetermined roughness is produced on the transmission surface.  
   
   
       3 . The method of  claim 21  or  2 , comprising coordinating rotational speed of the workpiece spindle with the pendulum-like motion.  
   
   
       4 . The method of  claim 3 , comprising varying the rotational speed of the workpiece spindle according to radial position of the grinding wheel on the transmission surface.  
   
   
       5 . The method of  claim 21  or  2 , comprising varying speed of the pendulum-like motion according to radial position of the grinding wheel on the transmission surface.  
   
   
       6 . The method of  claim 21  or  2 , wherein said imparting of pendulum-like motion comprises imparting pendulum-like motion to the transmission plate.  
   
   
       7 . The method of  claim 21  or  2 , wherein said imparting of pendulum-like motion comprises imparting pendulum-like motion to the grinding wheel.  
   
   
       8 . The method of  claim 21  or  2 , wherein the apparatus comprises a second workpiece spindle and the method comprises grinding a transmission surface of each of two transmission plates in one set-up the relative pendulum-like motion being imparted for the grinding of both transmission plates in said one set-up.  
   
   
       9 . The method of  claim 8 , wherein said imparting of pendulum-like motion comprises imparting pendulum-like motion to the workpiece spindles by turning the workpiece spindles about a common pivot point and thereby producing a spherical form of the transmission surfaces.  
   
   
       10 . The method of  claim 8 , wherein said imparting of pendulum-like motion comprises imparting pendulum-like motion to the grinding wheel and thereby producing a conical form of the transmission surfaces.  
   
   
       11 . Apparatus for manufacture of transmission plates for a continuously variable transmission, in which at least one pair of the transmission plates are in frictional contact at transmission surfaces thereof with a force transfer element during operation of the transmission, the apparatus comprising at least one workpiece spindle a grinding spindle, a grinding wheel rotationally drivable by the grinding spindle about an axis of symmetry of the grinding wheel for grinding the transmission surface of at least one of the transmission plates, and means for imparting relative pendulum-like motion, between the grinding wheel and the transmission plate.  
   
   
       12 . The apparatus of  claim 11 , is comprising means for imparting back-and-forth motion to the grinding wheel.  
   
   
       13 . The apparatus of  claim 11 , comprising means for imparting back-and-forth motion to the transmission plate.  
   
   
       14 . The apparatus of  claim 12 , comprising a carriage for the grinding spindle, a central axis of the grinding spindle being horizontally adjustable in its angle to a central axis of the workpiece spindle.  
   
   
       15 . The apparatus of  claim 13 , wherein the workpiece spindle is rotatable about a pivot point to produce a spherical exterior shape of the transmission surface.  
   
   
       16 . The apparatus of any one of  claims 11  to  15 , further comprising a control system for controlling the relative pendulum-like motion.  
   
   
       17 . The apparatus of  claim 16 , wherein the control system controls rotational speed of the workpiece spindle and speed of the pendulum-like motion.  
   
   
       18 . The apparatus of any one of  claims 11  to  14 , further comprising a second workpiece spindle each for accommodating a respective transmission plate; the workpiece spindles being adjustable with respect to one another in their alignment and in their spacing apart with reference to a swing angle α.  
   
   
       19 . The apparatus of  claim 18 , wherein, the workpiece spindles are rotatable about a common pivot point to produce a spherical shape of the transmission surfaces.  
   
   
       20 . A CNC machining center comprising the apparatus of any one of  claims 11  to  15 .  
   
   
       21 . Method for producing transmission plates for a continuously variable transmission in which at least one pair of transmission plates is arranged with transmission surfaces thereof opposite to one another and in frictional contact with a force-transferring element during the operation of the transmission, the method being executed on an apparatus having at least one workpiece spindle, a grinding wheel and a grinding spindle driving the grinding wheel in order to grind the transmission surface of at least one of the transmission plates, the method comprising, during the grinding of the transmission surface, imparting relative pendulum-like motion between the grinding wheel and the transmission plate so that an area of grinding migrates back and forth between an inside radius and an outside radius of the transmission surface while rotating the transmission plate by means of the workpiece spindle so that the entire transmission surface is ground, and coordinating movements of the grinding wheel and the transmission plate with one another, so that, a non-circular abrasion pattern is generated on the transmission surface whereby roughness of the transmission surface is adjusted to a predetermined extent.