1. Field of the Invention
The present invention relates to a hydraulic circuit, and in particular to a hydraulic circuit including an accumulator having an inflow passage which introduces a hydraulic fluid which is discharged from a hydraulic pump into a hydraulic fluid chamber and a discharge passage which discharges the hydraulic fluid from the hydraulic fluid chamber to a hydraulic actuator.
2. Description of the Related Art
An example of this type of hydraulic circuit is disclosed in, for example, Japanese Patent No. 2576998. In the disclosed hydraulic circuit, a hydraulic fluid which is discharged from a hydraulic pump is introduced into a hydraulic fluid chamber of an accumulator through an inflow passage, and then the hydraulic fluid is discharged from the hydraulic fluid chamber of the accumulator to a hydraulic actuator such as a hydraulic booster through a discharge passage. As a result, pulsations of the hydraulic fluid discharged from the hydraulic pump are securely decreased by the operation of the accumulator.
In the case where an accumulator which operates when the pressure in a hydraulic fluid chamber is at least a set pressure is used to decrease pulsations of the hydraulic fluid discharged from a hydraulic pump, in a transient period until the pressure in the hydraulic fluid chamber reaches the set pressure, the accumulator does not operate, and pulsations of the hydraulic fluid which is discharged from the hydraulic pump cannot be decreased.