High-pressure pump

A high-pressure pump that is configured to pressurize fuel, comprising:

• a housing that includes:
• an inflow port that is configured to be supplied with the fuel;
• a plunger hole;
• a pressurizing chamber that is formed at one end part of the plunger hole and is configured to pressurize the fuel in the pressurizing chamber;
• a suction passage that is connected to the pressurizing chamber, wherein the suction passage is configured to be communicated with the inflow port and is configured to conduct the fuel to be suctioned into the pressurizing chamber;
• a discharge passage that is configured to conduct the fuel, which is pressurized in and discharged from the pressurizing chamber;
• and
• a relief passage that has one end part connected to the discharge passage while another end part of the relief passage is configured to be communicated with the suction passage;
• a suction valve device that is placed in the suction passage, wherein the suction valve device is configured to enable or limit a flow of the fuel between one side of the suction passage, at which the pressurizing chamber is located, and another side of the suction passage, which is opposite to the pressurizing chamber, at a valve opening time or a valve closing time of the suction valve device;
• a discharge valve device that is placed in the discharge passage, wherein the discharge valve device is configured to enable or limit a flow of the fuel between one side of the discharge passage, at which the pressurizing chamber is located, and another side of the discharge passage, which is opposite to the pressurizing chamber, at a valve opening time or a valve closing time of the discharge valve device;
• a plunger that is placed at an inside of the plunger hole such that one end part of the plunger is placed at the pressurizing chamber, wherein the plunger is configured to reciprocate in an axial direction to increase or decrease a volume of the pressurizing chamber;
• and
• a relief valve device that is placed in the relief passage and is configured to enable or limit a flow of the fuel between one side of the relief passage, at which the discharge passage is located, and another side of the relief passage, which is opposite to the discharge passage, at a valve opening time or a valve closing time of the relief valve device, wherein:
• one end part of the relief passage is connected to the discharge passage, and another end part of the relief passage is spaced away from the one end part of the relief passage in a counter-pressurization direction that is a moving direction of the plunger at a time of increasing the volume of the pressurizing chamber, and the relief passage extends from the one end part to the another end part of the relief passage;
• the housing includes a fuel reservoir that is placed at a side of the plunger, which is opposite to the pressurizing chamber;
• the fuel reservoir is located on a radially outer side of the plunger and is configured to accumulate the fuel;
• the relief passage is connected to the suction passage through the fuel reservoir;
• and
• the fuel, which enters the inflow port, is enabled to flow to the suction valve device through the fuel reservoir.