Patent ID: 9528627
Filing Date: 2016-12-27
CPC Classification: F16D,F16K

Claim Text:
1. A hydraulic drive comprising: a movable coupling device comprising an emergency spring braced between a movable driving-side spring abutment and a movable driven-side spring abutment; and a locking device configured to fix a spacing of the driving-side spring abutment and the driven-side spring abutment in a normal operating mode of the drive, the locking device being at least one of hydraulic, pneumatic, and magnetic, a valve having a valve body operably connected to the driven-side spring abutment; an adjustment drive configured to generate a translatory driving-side movement which is transmitted via the coupling device into a translatory driven-side movement of the valve body; a cylinder that is positionally fixed in the hydraulic drive and defines a driven-side annular chamber; and a driven-side piston positioned in the driven-side annular chamber and fixedly connected via a driven-side piston rod to the driven-side spring abutment, wherein the locking device and the emergency spring are configured such that, when the hydraulic drive is in an emergency mode, the locking device is released and the emergency spring is relaxed, and wherein, when the locking device is released, the emergency spring biases the valve body in a closing direction so as to close the valve.