High-pressure fuel supply pump

Patent metadata

Field	Value
Publication number	US-10683835-B2
Application number	US-201916449771-A
Country	US
Kind code	B2
Filing date	Jun 24, 2019
Priority date	Dec 27, 2013
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

A fuel pump includes an electromagnetically driven intake valve mechanism, a pump housing, a discharge valve, an opening, a seal member, and a first relief passage. The relief valve mechanism has a relief valve, a relief valve seat contacting the relief valve when the relief valve is closed and a relief spring biasing the relief valve against the relief valve seat. A second relief passage, communicating the first relief passage and a hole formed in the relief seat, is formed between the seal member and the relief valve seat. The relief valve seat, the relief valve, and the relief spring are arranged in this order beginning from the open end side.

First claim

The invention claimed is:

1. A fuel pump comprising:
an electromagnetically driven intake valve mechanism that includes a plunger rod;
a pump housing formed with a discharge path in communication with a compression chamber;
a discharge valve arranged in the discharge path;
an opening formed in the pump housing in which a relief valve mechanism is arranged;
a seal member closing an open end of the opening;
a first relief passage communicating a downstream side of the discharge valve with the opening; wherein
the relief valve mechanism has a relief valve, a relief valve seat contacting the relief valve when the relief valve is closed and a relief spring biasing the relief valve against the relief valve seat,
a second relief passage communicating the first relief passage and a hole formed in the relief valve seat is formed between the seal member and the relief valve seat, and
the relief valve seat, the relief valve, and the relief spring are arranged in this order beginning from an open end side.

2. The fuel pump according to claim 1 , wherein the opening of the pump body has a bottom formed by the pump body, and
the relief valve seat, the relief valve, the relief spring and the bottom of the opening are arranged in this order beginning from the open end side.

3. The fuel pump according to claim 1 , wherein a longitudinal axis of the plunger rod is coincident with a longitudinal axis of the discharge path.

4. The fuel pump according to claim 3 , wherein
in a horizontal cross section, the relief valve mechanism is arranged on one side with respect to an axis including the two longitudinal axes, and
an intake joint through which a low-pressure fuel flows is arranged on the other side with respect to the axis.

5. The fuel pump according to claim 4 , wherein a low-pressure passage communicating a low-pressure fuel port of the intake joint and a low-pressure chamber in which a pressure pulsation reducing mechanism is provided is arranged on the other side with respect to the longitudinal axis.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• SASO Yuta
• Saito Atsuji
• Usui Satoshi
• Tamura Shingo
• Akiyama Moritsugu
• Yamada Hiroyuki
• Hohkita Atsushi

Classifications

• F04B1/0452

  Distribution members, e.g. valves (machines or pumps with cam-actuated distribution members at the outer ends of the cylinders F04B1/0472; machines or pumps with cam-actuated distribution members at the inner ends of the cylinders F04B1/0531; the piston-driving cams being provided with inlets and outlets F04B1/0535) · CPC title

• F02M59/025

  characterised by a single piston · CPC title

• F02M59/46

  Valves · CPC title

• F02M59/48

  Assembling; Disassembling; Replacing · CPC title

• F02M2200/8061

  involving press-fit, i.e. interference or friction fit · CPC title