Patent ID: 9643301
Date: 2017-05-09
CPC Classifications: B25B

Claim:
1. An impact device for power transmission, comprising: an impact unit having a hydraulic cylinder, and a piston assembly and an output shaft disposed inside the hydraulic cylinder for generating torque through the output shaft by utilizing a hydraulic pressure provided inside the hydraulic cylinder; and a hydraulic pressure adjusting unit disposed in the hydraulic cylinder and configured for adjusting the hydraulic pressure of the hydraulic cylinder, wherein the impact unit has a first chamber and a second chamber, and the hydraulic pressure adjusting unit comprises a tube, a blocking member and an adjusting member; the tube has at least one first opening communicated with the first chamber, and a second opening communicated with the second chamber; the blocking member is disposed inside the tube and selectively blocks the at least one first opening; the adjusting member is configured for enabling the blocking member to be movably disposed in the tube and mounted with the adjusting member for adjusting an area of the first opening that is blocked by the blocking member.