High-pressure fuel supply pump
View Patent ↗It is an object of the present invention to provide an electromagnetic valve structure improved in terms of the responsiveness of the electromagnetic valve and helping to realize a more accurate flow rate control, and to provide a high-pressure fuel supply pump in which the same is mounted. There is provided a high-pressure fuel supply pump having an electromagnetic valve equipped with an electromagnetic coil generating an electromagnetic force for opening and closing a valve body provided between a fuel intake path and a pressure chamber, a movable member operated by the electromagnetic force, a housing accommodating the movable member, and a back-pressure chamber formed between the housing and the movable member, wherein a first fuel path causing the back-pressure chamber to communicate with the intake path passes the center axis of the movable member.
1. A high-pressure fuel supply pump comprising:
a fuel intake path;
a pressure chamber; and
an electromagnetic valve equipped with:
an electromagnetic coil configured to generate an electromagnetic force for closing a valve body provided between the fuel intake path and the pressure chamber,
a movable member configured to be operated by the electromagnetic force,
an anchor spring urging the movable member in an opening direction of the valve body,
a housing accommodating the movable member,
a back-pressure chamber formed between the housing and the movable member, wherein the movable member has an anchor and a rod,
a guiding member in which the rod is slidably guided, and
an intermediate chamber provided between the anchor and the guiding member, wherein
the rod is made of a material having greater hardness and greater magnetic resistance than a material of the anchor,
a first fuel path allowing the back-pressure chamber to communicate with the intermediate chamber extends along a center axis of the rod,
a first end of the first fuel path is immediately adjacent to and opens directly into the back-pressure chamber,
a receiving surface for receiving the anchor spring is formed on the back-pressure chamber side end surface of the rod,
a second fuel path allowing the intermediate chamber to communicate with the intake path is provided in the guiding member,
the anchor has a large-diameter portion and a small-diameter portion formed on an intermediate chamber side, and
the intermediate chamber is provided in an outer peripheral side of the small-diameter portion of the anchor.
2. The high-pressure fuel supply pump according to claim 1 , wherein the movable member and the valve body are separate from each other.
3. The high-pressure fuel supply pump according to claim 1 , wherein the inner diameter of the anchor spring is larger than the inner diameter of the first fluid path.
4. The high-pressure fuel supply pump according to claim 1 , further comprising a recess portion that is formed on an anchor side of the guiding member, wherein the intermediate chamber is immediately adjacent to the recess portion.
5. The high-pressure fuel supply pump according to claim 4 , wherein in a valve opening state, a valve body side end portion of the small-diameter portion of the anchor is protruded into the recess portion of the guiding member.
6. The high-pressure fuel supply pump according to claim 1 , wherein the first fluid path communicates with the fuel intake path via a radial slit or hole formed in the movable member.
7. The high-pressure fuel supply pump according to claim 6 , wherein a sum total of the sectional areas perpendicular to the flow direction of the slit or the lateral hole are larger than a sectional area of the first fluid path.
8. The high-pressure fuel supply pump according to claim 6 , wherein sectional areas perpendicular to the flow direction of the slit or the lateral hole are larger than a sectional area of the first fluid path.
9. The high-pressure fuel supply pump according to claim 1 , wherein the intermediate chamber accommodating the valve body is provided between the pressure chamber and the fuel intake path.
10. The high-pressure fuel supply pump according to claim 9 , wherein the back-pressure chamber and the intake path are connected by the first fluid path and the second fluid path provided at a peripheral edge portion of the movable member via the intermediate chamber.
11. The high-pressure fuel supply pump according to claim 10 , wherein an entire sectional area of the second fluid path is larger than an entire sectional area of the first fluid path.
12. A high-pressure fuel supply pump comprising:
a fuel intake path;
a pressure chamber; and
an electromagnetic valve equipped with:
an electromagnetic coil configured to generate an electromagnetic force for closing a valve body provided between the fuel intake path and the pressure chamber,
a movable member configured to be operated by the electromagnetic force,
an anchor spring urging the movable member in an opening direction of the valve body,
a housing accommodating the movable member,
a back-pressure chamber formed between the housing and the movable member, wherein the movable member has an anchor and a rod,
a guiding member in which the rod is slidably guided, and
an intermediate chamber provided between the anchor and the guiding member, wherein
the rod is made of a material having greater hardness and greater magnetic resistance than a material of the anchor,
a first fuel path allowing the back-pressure chamber to communicate with the intermediate chamber extends along a center axis of the rod,
a first end of the first fuel path is immediately adjacent to and opens directly into the back-pressure chamber,
a receiving surface for receiving the anchor spring is formed on the back-pressure chamber side end surface of the rod,
a second fuel path allowing the intermediate chamber to communicate with the intake path is provided in the guiding member,
the anchor has a large-diameter portion and a small-diameter portion formed on an intermediate chamber side, and
the intermediate chamber is provided in an outer peripheral side of the small-diameter portion of the anchor.
13. The high-pressure fuel supply pump according to claim 12 , wherein the movable member and the valve body are separate from each other.
14. The high-pressure fuel supply pump according to claim 12 , further comprising a recess portion that is formed on an anchor side of the guiding member, wherein the intermediate chamber is immediately adjacent to the recess portion.
15. The high-pressure fuel supply pump according to claim 14 , wherein in a valve opening state, a valve body side end portion of the small-diameter portion of the anchor is protruded into the recess portion of the guiding member.
16. The high-pressure fuel supply pump according to claim 12 , wherein the first fluid path communicates with the fuel intake path via a radial slit or hole formed in the movable member.
17. The high-pressure fuel supply pump according to claim 16 , wherein a sum total of sectional areas perpendicular to the flow direction of the slit or the lateral hole are larger than a sectional area of the first fluid path.
18. The high-pressure fuel supply pump according to claim 16 , wherein sectional areas perpendicular to the flow direction of the slit or the lateral hole are larger than a sectional area of the first fluid path.
19. The high-pressure fuel supply pump according to claim 12 , wherein the intermediate chamber accommodating the valve body is provided between the pressure chamber and the fuel intake path.
20. The high-pressure fuel supply pump according to claim 19 , wherein the back-pressure chamber and the intake path are connected by the first fluid path and a second fluid path provided at the peripheral edge portion of the movable member via the intermediate chamber.
21. The high-pressure fuel supply pump according to claim 20 , wherein an entire sectional area of the second fluid path is larger than an entire sectional area of the first fluid path.