Gearbox Shifting Point For Producing A Rotationally Fixed Connection Between At Least One Gearwheel And One Shaft

Abstract

A gearbox shifting point for producing a rotationally fixed connection between at least one gearwheel and one shaft. The gearbox shifting point comprises a shaft, a shifting sleeve and two gearwheels. The two gearwheels are each rotatably mounted in relation to the shaft. The shifting sleeve is mounted in a rotationally secured fashion on the shaft. The shifting sleeve and the gearwheels are embodied in such a way that a positively locking, rotationally fixed connection can be produced between the shifting sleeve and in each case one gearwheel. In order to improve problems with respect to a gearshifting hole or blockage of the gearbox, the shifting sleeve interacts with the two gearwheels in such a way that at least one positively locking, rotationally fixed connection is always produced between the shifting sleeve and one of the gearwheels.

1 . In a gearbox shifting point for producing a rotationally fixed connection between at least one gearwheel and one shaft, including a shaft, a shifting sleeve and two gearwheels, said two gearwheels each being rotatably mounted in relation to the shaft, said shifting sleeve being mounted in a rotationally secured fashion on the shaft, and said shifting sleeve and said two gearwheels being embodied in such a way that a positive locking, rotationally fixed connection can be produced between the shifting sleeve and, in each case, one of said two gearwheels, the improvement comprising: said shifting sleeve having a pair of surface arrangements for respectively interacting a surface arrangement of each of said two gearwheels, with said shifting sleeve being mounted in such a way that at least one positive, locking rotationally fixed connection is always effected between one of said pair of interacting surface arrangements of said shifting sleeve and with the interacting surface arrangement of said two gearwheels.  
   
   
       2 . The gearbox shifting point according to  claim 1 , wherein said shifting sleeve is arranged between said two gearwheels.  
   
   
       3 . The gearbox shifting point according to  claim 1 , wherein said pair of interacting surface arrangements of said shifting sleeve and each of said interacting surface arrangements of each of said two gearwheels is in the form of clutch teeth having the purpose of producing a positive locking connection.  
   
   
       4 . The gearbox shifting point according to  claim 3 , wherein said pair of interacting clutch teeth of said shifting sleeve and the interacting clutch teeth of each of said two gearwheels are embodied in such a way that an engagement with overlap is always present between the pair of clutch teeth of the shifting sleeve and said clutch teeth of each of said two gearwheels.  
   
   
       5 . The gearbox shifting point according to  claim 4 , wherein said pair of clutch teeth of said shifting sleeve and said clutch teeth of each of said two gearwheels define one of axial or radial claws.  
   
   
       6 . The gearbox shifting point according to  claim 4 , wherein said pair of clutch teeth of said shifting sleeve and said clutch teeth of each of said two gearwheels is embodied with a flat roof.  
   
   
       7 . The gearbox shifting point according to  claim 4 , wherein each pair of clutch teeth of said shifting sleeve and said clutch teeth of each of said gearwheels is of one of an undercut or deflecting design.  
   
   
       8 . The gearbox shifting point according to one of  claim 1 , wherein said shifting sleeve is mounted on the shaft by means of roller bodies and is arranged so as to be displaceable axially along said shaft.  
   
   
       9 . The gearbox shifting point according to claims  1 , and further including an armature plate arranged concentrically relative to said shaft and being joined to said shifting sleeve, whereby said shifting sleeve can be shifted by shifting said armature plate.  
   
   
       10 . The gearbox shifting point according to  claim 9 , wherein said armature plate is mounted for axial movement in relation to the shifting sleeve, and further including a prestressing element engaged with said armature plate and forcing it into a predefined position with a prestressing force.  
   
   
       11 . The gearbox shifting point according to  claim 10 , and further including one of a mechanical or a hydraulic means being coupled for activating said armature plate.  
   
   
       12 . The gearbox shifting point according to  claim 9 , and further including at least one electromagnet being located in the vicinity of said armature plate and being operable when activated to attract said armature plate to cause the armature plate to move, thereby shifting said shifting sleeve.  
   
   
       13 . The gearbox shifting point according to  claim 10 , and further including an electromagnet mounted in the vicinity of said armature plate and being activated so as to cause said armature plate to be moved counter to said prestressing force.  
   
   
       14 . The gearbox shifting point according to  claim 9 , and further including two electromagnets, mounted one on each side of said armature plate and being selectively activated so as to cause said armature plate to move said shifting sleeve between first and second engaged shifted states.  
   
   
       15 . The gearbox shifting point according to  claim 12 , wherein said at least one electromagnet includes a radial pot magnet.  
   
   
       16 . The gearbox shifting point according to  claim 12 , wherein said at least one electromagnet is mounted on the shaft.  
   
   
       17 . The gearbox shifting point according to  claim 12 , wherein said at least one electromagnet is integrated into the shifting sleeve.  
   
   
       18 . The gearbox shifting point according to  claim 12 , wherein said at least one electromagnet is provided with a plurality of sliding contacts adapted for connection to a source of electrical energy.  
   
   
       19 . The gearbox shifting point according to claims  12 , and further including an electrical control unit coupled to said at least one electromagnet for selectively actuating said at least one electromagnet for initiating a gearshifting process resulting in shifting said shifting sleeve.  
   
   
       20 . The gearbox shifting point according to  claim 19 , and further including at least one rotational speed sensor with which the rotational speed of one of said two gearwheels can be determined one of directly or indirectly.  
   
   
       21 . The gearbox shifting point according to  claim 20 , wherein said electrical control unit is programmed in such a way that the rotational speed condition and torque condition favorable for a gearshifting process can be determined by reference to the rotational speed information of the at least one rotational speed sensor.  
   
   
       22 . The gearbox shifting point according to  claim 19 , and further including a current measuring device with which the strength of current which can be applied to said at least one electromagnet can be measured.  
   
   
       23 . The gearbox shifting point according to  claim 19 , and further including a magnetic field strength sensor mounted for sensing a magnetic field strength in an area near to the electromagnet.  
   
   
       24 . The gearbox shifting point according to  claim 23 , wherein an activation force which is applied to said armature plate is applied in such a way that it is possible to activate the shifting sleeve even when there is a maximum force transfer between one of said two gearwheels and said shaft.  
   
   
       25 . The gearbox shifting point according to  claim 24 , wherein a voltage of at least 90 V can be applied to said at least one electromagnet.  
   
   
       26 . The gearbox shifting point according to  claim 25 , and further including an electric capacitor coupled for selectively activating said at least one electromagnet to thereby supply that energy which is necessary for a gearshifting process.