High-pressure fuel pump

Patent metadata

Field	Value
Publication number	US-10378524-B2
Application number	US-201615577050-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Sep 29, 2015
Publication date	Aug 13, 2019
Grant date	Aug 13, 2019

Abstract

A high-pressure fuel pump capable of reducing the number of components and decreasing the manufacturing cost by processing of a pump body is provided. The high-pressure fuel pump includes a metal damper, a pump body in which a damper housing that houses the metal damper is formed, a damper cover attached to the pump body, covering the damper housing, and holding the metal damper between the pump body and the damper cover, and a holding member fixed to the damper cover and holding the metal damper from a side opposite to the damper cover. The holding member is provided with an elastic portion that urges the pump body so that the metal damper is urged toward the damper cover.

First claim

The invention claimed is:

1. A high-pressure fuel pump, comprising:
a metal damper;
a damper housing that is formed in a pump body and houses the metal damper;
a damper cover attached to the pump body that covers the damper housing and the metal damper between the pump body and damper cover;
a holding member that is fixed to the damper cover and holds a lower side of the metal damper, wherein the lower side is a side of the damper that is opposite to the damper cover;
a fuel path formed through the holding member;
a communication path formed along an outer periphery of the holding member, wherein the communication path allows the lower side of the damper to communicate with an upper side of the damper; and
an elastic portion formed in the fuel path of the holding member, wherein the elastic portion urges the pump body so that the metal damper is urged toward the damper cover.

2. A high-pressure fuel pump, comprising:
a metal damper;
a damper housing that is formed in a pump body and houses the metal damper;
a damper cover attached to the pump body that covers the damper housing and the metal damper between the pump body and damper cover;
a holding member that is fixed to the damper cover by press fitting and holds the metal damper from a lower side of the metal damper, wherein the lower side is a side of the damper that is opposite to the damper cover;
a fuel path formed through the holding member;
a communication path formed along an outer periphery of the holding member, wherein the communication path allows the lower side of the damper to communicate with an upper side of the damper; and
an elastic portion formed in the fuel path of the holding member, wherein the elastic portion urges the pump body so that the metal damper is urged toward the damper cover.

3. The high-pressure fuel pump according to claim 1 , wherein:
the holding member includes a bottom portion formed in an approximately flat shape, and
the elastic portion is formed from a part of the bottom portion that is cut and raised toward the pump body.

4. The high-pressure fuel pump according to claim 1 , wherein:
the holding member includes
a bottom portion,
an inner peripheral side portion formed from the bottom portion toward the damper cover, and
an outer peripheral side portion formed from the inner peripheral side portion toward the bottom portion, and

the outer peripheral side portion is press-fitted into the damper cover to fix the holding member to the damper cover.

5. The high-pressure fuel pump according to claim 1 , wherein
the holding member and the elastic portion are made of a single press plate.

6. The high-pressure fuel pump according to claim 1 , wherein
the holding member is configured such that only the elastic portion touches the pump body.

7. The high-pressure fuel pump according to claim 1 , wherein
the holding member is provided with a cutout on both left and right sides when seen from the upper side, so that the holding member is formed approximately in a rectangular shape.

8. The high-pressure fuel pump according to claim 1 , wherein
the holding member includes a bottom portion formed in an approximately flat shape, and
a lower end of the damper cover is positioned lower than the bottom portion over an entire region of the bottom portion.

9. The high-pressure fuel pump according to claim 1 , wherein:
the holding member includes a bottom portion formed in an approximately flat shape,
the elastic portion is formed by a part of the bottom portion that is cut and raised toward the pump body, and
a lower end of the damper cover is positioned lower than the elastic portion over an entire region of the elastic portion.

10. The high-pressure fuel pump according to claim 1 , wherein
before the damper cover is attached to the pump body, the metal damper is fitted to the damper cover with the holding member to form an independent unit.

11. The high-pressure fuel pump according to claim 2 , wherein
the holding member is provided with a cutout on both left and right sides when seen from the upper side, so that the holding member is formed approximately in a rectangular shape.

12. The high-pressure fuel pump according to claim 2 , wherein
the holding member includes a bottom portion formed in an approximately flat shape, and
a lower end of the damper cover is positioned lower than the bottom portion over an entire region of the bottom portion.

13. The high-pressure fuel pump according to claim 2 , wherein
before the damper cover is attached to the pump body, the metal damper is fitted to the damper cover with the holding member to form an independent unit.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Saito Atsuji
• Usui Satoshi
• Yagai Masamichi
• Hashida Minoru
• Suganami Masayuki
• Tokuo Kenichiro
• Hohkita Atsushi
• SASO Yuta
• TOKUMARU Kazuaki

Classifications

• F04B53/16

  Casings; Cylinders; Cylinder liners or heads; Fluid connections · CPC title

• F04B11/0033

  with a mechanical spring · CPC title

• F02M2200/8061

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

• F02M2200/315

  for damping fuel pressure fluctuations · CPC title

• F02M55/04

  Means for damping vibrations {or pressure fluctuations} in injection pump inlets {or outlets} · CPC title