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A hydraulic vehicle brake with a parking brake device, in particular for motor vehicles, includes a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein hydraulic pressure fluid can be applied to the hydraulic service pressure chamber for carrying out s

A hydraulic vehicle brake with a parking brake device, in particular for motor vehicles, includes a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein hydraulic pressure fluid can be applied to the hydraulic service pressure chamber for carrying out service brake operations so that the brake piston is actuatable along a longitudinal piston axis in order to achieve a braking effect. The parking brake device acts on the brake piston with an actuating device, which actuates a rolling-element ramp-type gear with an electromechanical actuator. In order to achieve a higher rate of overall efficiency as well as a reduced electric energy consumption, a two-step gear is interposed between the electromechanical actuator (7) and the actuating device (4), wherein the first gear step (11, 21, 31) on the inlet side is connected to an output shaft (8) of the electromechanical actuator (7) and the second gear step (12, 22, 32) on the outlet side is connected to the rolling-element ramp-type gear (1, 2, 3).

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1. A hydraulic vehicle brake with a parking brake device for motor vehicles comprising a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein hydraulic pressure fluid can be applied to the hydraulic service pressure chamber for carrying out service brak

1. A hydraulic vehicle brake with a parking brake device for motor vehicles comprising a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein hydraulic pressure fluid can be applied to the hydraulic service pressure chamber for carrying out service brake operations so that the brake piston is actuatable along a longitudinal piston axis (A) in order to achieve a braking effect,wherein the parking brake device acts on the brake piston by means of an actuating device, which actuates the brake piston to perform parking brake operations by means of a rolling-element ramp gear that is driven by an electromechanical actuator, and holds the brake piston in the actuated position,wherein at least one spring element acts on the rolling-element ramp gear in order to bias the brake piston toward the actuated position, maintain an adjusted clamping force on the hydraulic vehicle brake, and compensate thermal shrinking effects of the hydraulic vehicle brake,wherein a two-step gear is interposed between the electromechanical actuator and the actuating device, the first gear step on the inlet side being connected to an output shaft of the electromechanical actuator and the second gear step on the outlet side being connected to the rolling-element ramp gear, andwherein the two-step gear is a combination of a crown gear and a worm gear, with the worm gear forming the second gear step and having a self-locking design. 2. A hydraulic vehicle brake with a parking brake device for motor vehicles comprising a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein hydraulic pressure fluid can be applied to the hydraulic service pressure chamber for carrying out service brake operations so that the brake piston is actuatable along a longitudinal piston axis (A) in order to achieve a braking effect,wherein the parking brake device acts on the brake piston by means of an actuating device, which actuates the brake piston to perform parking brake operations by means of a rolling-element ramp gear that is driven by an electromechanical actuator, and holds the brake piston in the actuated position,wherein at least one spring element acts on the rolling-element ramp gear in order to bias the brake piston toward the actuated position, maintain an adjusted clamping force on the hydraulic vehicle brake, and compensate thermal shrinking effects of the hydraulic vehicle brake,wherein a two-step gear is interposed between the electromechanical actuator and the actuating device, the first gear step on the inlet side being connected to an output shaft of the electromechanical actuator and the second gear step on the outlet side being connected to the rolling-element ramp gear, andwherein the two-step gear is designed as a combination of a gear reducer unit and an eccentric gear, wherein the eccentric gear forms the second gear step and has a self-locking design. 3. A hydraulic vehicle brake with a parking brake device including a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein hydraulic pressure fluid can be applied to the hydraulic service pressure chamber for carrying out service brake operations so that the brake piston is actuatable along a longitudinal piston axis (A) in order to achieve a braking effect,wherein the parking brake device acts on the brake piston by means of an actuating device, which actuates the brake piston to perform parking brake operations by means of a rolling-element ramp gear that is driven by an electromechanical actuator, and holds the brake piston in the actuated position,wherein at least one spring element acts on the rolling-element ramp gear in order to bias the brake piston toward the actuated position, maintain an adjusted clamping force on the hydraulic vehicle brake, and compensate thermal shrinking effects of the hydraulic vehicle brake,wherein a two-step gear is interposed between the electromechanical actuator and the actuating device, the first gear step on the inlet side being connected to an output shaft of the electromechanical actuator and the second gear step on the outlet side being connected to the rolling-element ramp gear, andwherein the two-step gear is configured as a two-step worm gear, and at least one of the two gear steps has a self-locking design. 4. The hydraulic vehicle brake as claimed in claim 3, wherein the electromechanical actuator is arranged in such a fashion that its output shaft is disposed in parallel to the longitudinal piston axis (A). 5. The hydraulic vehicle brake as claimed in claim 4, wherein dampening elements decouple the electromechanical actuator from the brake housing and a housing which accommodates the two-step gear and the electromechanical actuator. 6. The hydraulic vehicle brake as claimed in claim 3, wherein a sensor element is provided to sense the angular position of the output shaft of the electromechanical actuator or to sense the angular position of a gear element. 7. The hydraulic vehicle brake as claimed in claim 3, wherein the consumption of the electromechanical actuator is measured. 8. The hydraulic vehicle brake as claimed in claim 3, wherein the spring element is designed as a cup spring assembly, which acts on the brake piston and can be loaded hydraulically and/or electromechanically. 9. The hydraulic vehicle brake as claimed in claim 3, wherein the spring element is configured as a torsion spring, which acts on a gear element of the two-step worm gear and can be loaded electromechanically. 10. The hydraulic vehicle brake as claimed in claim 3, wherein the vehicle brake has a modular design, and wherein the electromechanical actuator and the two-step gear are part of a subassembly that can be handled independently. 11. The hydraulic vehicle brake as claimed in claim 3, wherein the brake has a mechanical unlocking device for unlocking the parking brake. 12. The hydraulic vehicle brake as claimed in claim 3, wherein the rolling-element ramp gear is formed of a driving ramp and an output end ramp, wherein rolling elements are provided between the driving ramp and the output end ramp.