Charging mechanism for charging a stored-energy spring of a stored-energy spring mechanism

A tensioning mechanism for tensioning an accumulator spring of a spring stored energy mechanism, the tensioning mechanism comprising:

• a tensioning gear coupled to the accumulator spring;
• an intermediate shaft coupled to said tensioning gear;
• an intermediate gear to be driven by a tensioning motor;
• a freewheel coupled to said intermediate gear;
• a dog clutch with a first clutch block coupled fixedly to said intermediate shaft so as to rotate with said intermediate shaft, a second clutch block connected to said freewheel, and a synchronizer ring disposed between said first and second clutch blocks and is coupled fixedly to said first clutch block so as to rotate with said first clutch block, said synchronizer ring being displaceable parallel to a rotational axis of said intermediate shaft relative to said first clutch block, and is pressed onto said second clutch block;
• it being possible for said first clutch block to be displaced parallel to the rotational axis between a first end position, in which said first clutch block bears against said second clutch block and in the first end position a tensioning of the accumulator spring occurs, and a second end position, in which said first clutch block is disconnected from the second clutch block and in the second end position it is assumed that the accumulator spring is in a tensioned state;
• and
• said synchronizer ring coupling in a form-locking manner to said second clutch block in a case of a rotation relative to said second clutch block in a first rotational direction about the rotational axis, and, in a case of an open said dog clutch, it being possible for said synchronizer ring to be rotated relative to said second clutch block in a second rotational direction about the rotational axis, the second rotational direction being opposed to the first rotational direction.