Fuel pump

Patent metadata

Field	Value
Publication number	US-12095339-B2
Application number	US-202017430555-A
Country	US
Kind code	B2
Filing date	Feb 5, 2020
Priority date	Feb 25, 2019
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

A coil component of an electromagnetic valve is made compact to achieve both low cost and improvement in sound vibration performance. Therefore, a high-pressure fuel pump of the present invention includes: a coil 3 g ; a magnetic core 3 e that is arranged on a side opposite to a pressurizing chamber 11 with respect to a movable core 3 h and attracts the movable core 3 h when the coil 3 g is energized; a yoke 3 q arranged on a radially outer side of the coil 3 g ; a cover portion 3 r that covers the coil 3 g from an axially outer side; and a molded portion 17 that covers a radially outer side of the yoke 3 q and an axially outer side of the cover portion 3 r.

First claim

The invention claimed is:

1. A fuel pump comprising:
an electromagnetic intake valve mechanism comprising:
a body:
a coil;
a movable core;
a magnetic core that is arranged on a side opposite to a pressurizing chamber with respect to the movable core and attracts the movable core when the coil is energized;
a yoke arranged on a radially outer side of the coil;
a cover portion that covers the coil from an axially outer side; and
a molded portion that covers a radially outer side of the yoke and an axially outer side of the cover portion, wherein
the yoke includes a bottom portion with a hole formed therein on a side of the pressurizing chamber and an open portion on the side opposite to the pressurizing chamber,
the cover portion is arranged to cover the open portion,
an inner peripheral portion of the hole formed in the bottom portion of the yoke and an outer peripheral portion of the body are fixed by press fitting,
the cover portion is arranged on a radially inner side of the yoke and is arranged with a gap interposed between the cover portion and an inner peripheral surface of the yoke, and
the molded portion is formed to be in contact with an axially outer end surface of the cover portion and is formed in a range from an axially outer end surface of the yoke over an axial center of an outer peripheral surface of the yoke.

2. The fuel pump according to claim 1 , wherein
the cover portion is formed separately from the yoke.

3. The fuel pump according to claim 1 , wherein
the molded portion is formed to cover a whole axially outer end surface of the magnetic core in a radial direction.

4. The fuel pump according to claim 1 , wherein
the molded portion is formed to cover the entire cover portion in a radial direction.

5. The fuel pump according to claim 1 , wherein
the molded portion is formed to cover from an axially outer end surface of the yoke to an axial center portion.

6. The fuel pump according to claim 1 , wherein
a space is formed between the molded portion and an axially outer end surface of the magnetic core.

Assignees

• Hitachi Astemo Ltd

Inventors

• Saito Atsuji
• Usui Satoshi

Classifications

• F02M51/04

  Pumps peculiar thereto · CPC title

• F02M2200/8046

  the manufacture involving injection moulding, e.g. of plastic or metal · CPC title

• F02M2200/8061

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

• F02M59/48

  Assembling; Disassembling; Replacing · CPC title

• F02M59/445

  Selection of particular materials · CPC title