| 主权项 |
1. A pressure regulator configured to regulate a working fluid having a high pressure and supplied from a high-pressure source, to a regulated pressure by a pilot pressure and configured to supply the pressure-regulated working fluid, comprising:
a housing; a high-pressure port to which is supplied the working fluid supplied from the high-pressure source, a low-pressure port which is to communicate with a low-pressure source, and a regulated-pressure port for supplying the pressure-regulated working fluid, the high-pressure port, the low-pressure port, and the regulated-pressure port being provided on the housing; a spool valve mechanism provided in the housing and having a spool configured to be movable in an axial direction of the pressure regulator, the spool valve mechanism being configured such that, when the spool is located at an end position in a movable range thereof that is nearer to one end of the pressure regulator in the axial direction, communication between the low-pressure port and the regulated-pressure port is allowed while communication between the high-pressure port and the regulated-pressure port is shut off and such that, when the spool is moved toward the other end of the pressure regulator in the axial direction, the communication between the low-pressure port and the regulated-pressure port is shut off while the communication between the high-pressure port and the regulated-pressure port is allowed; a biasing mechanism provided in the housing on one of opposite sides of the spool nearer to the one end of the pressure regulator and including a pilot-pressure chamber to which is introduced a working fluid having the pilot pressure and a pilot piston configured to push the spool toward the other end of the pressure regulator by the pressure of the working fluid in the pilot-pressure chamber applied to the pilot piston, the biasing mechanism being configured to bias the spool toward the other end of the pressure regulator by the pressure of the working fluid in the pilot-pressure chamber; a counter biasing mechanism provided in the housing on the other of the opposite sides of the spool nearer to the other end of the pressure regulator and having a regulated-pressure chamber which communicates with the regulated-pressure port and to which is introduced the working fluid having the regulated pressure and a counter biasing piston configured to push the spool toward the one end of the pressure regulator by the pressure of the working fluid in the regulated-pressure chamber applied to the counter biasing piston, the counter biasing mechanism being configured to bias the spool toward the one end of the pressure regulator by the pressure of the working fluid in the regulated-pressure chamber; and at least one of a first damping mechanism configured to damp a movement of the pilot piston and a second damping mechanism configured to damp a movement of the counter biasing piston. |
