Gear Mechanism for a Brake System, and Brake System

1 . A gear mechanism for a brake system, comprising:

a gear mechanism which can be coupled on the inlet side to an actuating drive of the brake system by way of a drive shaft and the drive shaft can be driven rotationally by the actuating drive and the gear mechanism can be coupled on the output side to a brake unit of the brake system by way of an output shaft and the brake unit comprises at least one brake or the gear mechanism comprises the drive shaft and/or the output shaft,

the gear mechanism comprises a first and second gear train with different transmission ratios and

the gear mechanism is configured is such a way that, in order to apply the brake, only the first gear train sand, in order to release the brake, only the second gear train of the gear mechanism transmits a drive torque of the actuating drive to the output shaft and the transmission ratio of the second gear train is greater than the transmission ratio of the first gear train.

2 . The gear mechanism according to claim 1 , wherein the gear mechanism is configured such that either the first gear train or the second gear train is selected depending on the direction of rotation of the drive shaft.

3 . The gear mechanism according to claim 1 , wherein the gear mechanism comprises a coupling unit that is arranged such that it can be moved into a first and into a second position area and that the drive shaft is coupled to output shaft by the coupling unit in the first and in the second position areas in such a way that coupling in the first position area forms the first gear train and coupling in the second position area forms the second gear train.

4 . The gear mechanism according to claim 3 , wherein a longitudinal toothing is provided in the drive shaft or the output shaft, and the coupling element is arranged so that it can be moved axially on the drive shaft or the output shaft into the first position area or the second position area, in such a way that the coupling element is rotationally coupled to the drive shaft or the output shaft by the longitudinal toothing.

5 . The gear mechanism according to claim 3 , wherein a helical groove is provided in the drive shaft, and the coupling unit has a lug, and the coupling unit is arranged so that it can be moved axially on the drive shaft in such a way that the lug engages in the groove, and the coupling unit is moved axially by the rotation of the drive shaft into the first position area or into the second position area depending on the direction of rotation.

6 . The gear mechanism according to claim 3 , wherein the coupling unit comprises at least one gear wheel or dog for the first gear train and the second gear train in each instance, which engages with a further gear wheel or dog that is assigned to the respective gear train in the first position area or in the second position area in order to transfer the drive torque.

7 . A brake system which comprises a drive unit and a brake unit with at least one brake, the drive unit comprising

an actuating drive,

a drive shaft which is coupled to the actuating drive and by which it can be rotationally moved,

an output shaft that is coupled to the brake unit in such a way that the brake unit applies or releases the brake depending on the direction of rotation of the output shaft,

a gear mechanism which is coupled on an inlet side to the drive shaft and on an outlet side to the output shaft or which comprises the drive shaft and/or the output shaft wherein the gear mechanism comprises a first and second gear train with different transmission ratios and the gear mechanism is configured is such a way that, in order to apply the brake, only the first gear train and, in order to release the brake, only the second gear train of the gear mechanism transmits a drive torque of the actuating drive to the output shaft and the transmission ratio of the second gear train is greater than the transmission ratio of the first gear train.

8 . The brake system according to claim 7 , wherein the gear mechanism is configured such that either the first gear train or the second gear train is selected depending on the direction of rotation of the drive shaft.

9 . The brake system according to claim 7 , wherein the gear mechanism comprises a coupling unit that is arranged such that it can be moved into a first and into a second position area and that the drive shaft is coupled to output shaft by the coupling unit in the first and in the second position areas in such a way that coupling in the first position area forms the first gear train and coupling in the second position area forms the second gear train.

10 . The brake system according to claim 9 , wherein a longitudinal toothing is provided in the drive shaft or the output shaft, and the coupling element is arranged so that it can be moved axially on the drive shaft or the output shaft into the first position area or the second position area, in such a way that the coupling element is rotationally coupled to the drive shaft or the output shaft by the longitudinal toothing.

11 . The brake system according to claim 9 , wherein a helical groove is provided in the drive shaft, and the coupling unit has a lug, and the coupling unit is arranged so that it can be moved axially on the drive shaft in such a way that the lug engages in the groove, and the coupling unit is moved axially by the rotation of the drive shaft into the first position area or into the second position area depending on the direction of rotation.

12 . The gear mechanism according to claim 9 , wherein the coupling unit comprises at least one gear wheel or dog for the first gear train and the second gear train in each instance, which engages with a further gear wheel or dog that is assigned to the respective gear train in the first position area or in the second position area in order to transfer the drive torque.