| 摘要 |
The present invention relates to a door drive, particularly to a revolution door drive. The revolution door drive comprises a casing, a driven shaft configured to connect with a door leaf or a door frame, a motor configured to drive the driven shaft and a spring unit. The spring unit is tensioned during the corresponding opening motion of the door leaf and is loosened during the corresponding closing motion of the door leaf. The driven shaft may be driven by the motor through a rack, wherein the rack is loaded through a straight tooth-conical tooth arranger. The straight tooth-conical tooth arranger comprises a helical gear drive part at the motor side, a straight spur gear drive part at the rack side and a bevel drive part arranged therebetween, particularly provided with a Gerritsen tooth part. |
