阅读说明：本技术 高压燃料供给泵 (High-pressure fuel supply pump ) 是由 中居裕贵 臼井悟史 内山康久 于 2018-05-11 设计创作，主要内容包括：本发明的目的在于提供一种配备有降低螺线管内的流路的流体阻力、提高流量控制性的电磁吸入阀的高压燃料供给泵。为此,本发明的高压燃料供给泵具备：阀芯,其对流路进行开闭；阀杆,其对所述阀芯施力；弹簧部,其对所述阀杆的外径凸部(凸缘部)的弹簧承接面施力；以及可动部,其与所述阀杆构成为不同个体,与所述阀杆的所述外径凸部(凸缘部)的外径凸部卡合面相卡合来进行驱动；所述可动部形成有在被固定部吸引而移动时供配置所述弹簧部的弹簧空间的燃料流动的连通孔,从轴向观察到的所述连通孔的最小截面积形成为比所述可动部与外周部的间隙的最小截面积大。(The invention provides a high-pressure fuel supply pump equipped with an electromagnetic suction valve which reduces the fluid resistance of a flow path in a solenoid and improves the flow rate control. To this end, the high-pressure fuel supply pump of the present invention includes: a valve element that opens and closes the flow path; a valve stem that applies force to the valve element; a spring portion that urges a spring receiving surface of an outer diameter convex portion (flange portion) of the valve rod; and a movable part configured to be separated from the valve rod and configured to be driven by being engaged with an outer diameter convex part engaging surface of the outer diameter convex part (flange part) of the valve rod; the movable portion is provided with a communication hole through which fuel in a spring space in which the spring portion is disposed flows when the movable portion is attracted to and moves by the fixed portion, and a minimum cross-sectional area of the communication hole as viewed in the axial direction is formed to be larger than a minimum cross-sectional area of a gap between the movable portion and the outer peripheral portion.)

1. A high-pressure fuel supply pump is characterized by comprising:

a valve element that opens and closes the flow path; a valve stem that applies force to the valve element; a spring portion that applies force to a spring receiving surface of the outer diameter convex portion of the valve rod; and a movable portion configured to be separated from the valve stem, and configured to be driven by being engaged with an outer diameter convex portion engagement surface of the outer diameter convex portion of the valve stem;

the movable part is provided with a communication hole for flowing fuel in a spring space for arranging the spring part when the movable part is attracted by the fixed part and moves,

the minimum cross-sectional area of the communication hole as viewed in the axial direction is formed larger than the minimum cross-sectional area of the gap between the movable portion and the outer peripheral portion.

2. A high-pressure fuel supply pump is characterized by comprising:

a valve element that opens and closes the flow path; a valve stem that applies force to the valve element; a spring portion that applies force to a spring receiving surface of the outer diameter convex portion of the valve rod; and a movable portion configured to be separated from the valve stem, and configured to be driven by being engaged with an outer diameter convex portion engagement surface of the outer diameter convex portion of the valve stem;

the movable part is provided with a communication hole for flowing fuel in a spring space for arranging the spring part when the movable part is attracted by the fixed part and moves,

the outer diameter convex portion engaging surface formed at a position overlapping the movable portion engaging surface in the radial direction is arranged to overlap the communication hole in the radial direction.

3. The high-pressure fuel supply pump according to claim 1 or 2,

a gap having a spring wire diameter or more is formed between the spring receiving surface and the movable portion suction surface of the outer diameter projection of the valve stem in a state where the movable portion is in contact with the fixed portion.

4. The high-pressure fuel supply pump according to claim 1 or 2,

an outermost diameter end portion of the outer diameter protrusion engaging surface of the valve stem is arranged to overlap a substantially central position in a radial direction of the communication hole.

5. The high-pressure fuel supply pump according to claim 1 or 2,

the valve rod is configured to form a gap between an outermost diameter end of the outer diameter protrusion engaging surface of the valve rod and an outermost diameter end of the communication hole.

6. The high-pressure fuel supply pump according to claim 1 or 2,

the communication hole is formed so as to extend from a radially inner peripheral side to a radially outer peripheral side with respect to an inner diameter surface of the fixing portion, the inner diameter surface forming the spring space.

7. The high-pressure fuel supply pump according to claim 1 or 2,

the communication hole is formed so as to extend from the radially inner peripheral side to the radially outer peripheral side with an inner diameter surface of the fixing portion, which forms the spring space, being substantially a center in the radial direction.

8. The high-pressure fuel supply pump according to claim 1 or 2,

the fixing portion has a first outer diameter portion and a second outer diameter portion, the second outer diameter portion is provided with a magnetic member at a radial outer side and is located at a radial inner side compared with the first outer diameter portion,

the outermost diameter portion of the movable portion is located on the inner diameter side of the first outer diameter portion.

9. The high-pressure fuel supply pump according to claim 1 or 2,

the movable portion engaging surface of the movable portion that engages with the outer diameter protrusion engaging surface of the outer diameter protrusion has a radial thickness that is smaller than a radial length of the communication hole.

10. The high-pressure fuel supply pump according to claim 1 or 2,

the radial thickness of a movable portion suction surface located radially outward of the communication hole of the movable portion and facing the fixed portion is formed to be substantially the same as the radial length of the communication hole.

Technical Field

The present invention relates to a high-pressure fuel supply pump that pressure-feeds fuel to a fuel injection valve of an internal combustion engine, and more particularly to a high-pressure fuel supply pump equipped with an electromagnetic intake valve that adjusts the amount of discharged fuel.

Background

In a direct injection internal combustion engine that directly injects fuel into a combustion chamber among internal combustion engines of automobiles and the like, a high-pressure fuel supply pump equipped with an electromagnetic intake valve that increases the pressure of the fuel and discharges a desired fuel flow rate is widely used.

Patent document 1 describes a high-pressure fuel supply pump in which a movable portion of a solenoid is configured by a magnetic circuit forming portion that forms a magnetic circuit and is formed on an outer peripheral side of an armature portion, and a guide portion that is formed on an inner peripheral side of the armature portion, has a higher hardness than the magnetic circuit forming portion, and guides a sliding surface with a valve stem, in addition to the configuration of an electromagnetic intake valve.

Disclosure of Invention

Problems to be solved by the invention

In recent years, as the flow rate of high-pressure fuel supplied to a high-pressure fuel supply pump equipped with an electromagnetic intake valve has become mainstream and the discharge pressure has become high, there has been an increasing demand for higher response of a solenoid. In order to achieve higher response, it is necessary to improve the magnetic characteristics of a magnetic circuit including an armature and a fixed core as movable portions. As magnetic characteristics are improved to achieve higher responsiveness, the influence of fluid resistance due to the fluid discharge accompanying the movement of the armature increases in inverse proportion to the improvement of the magnetic characteristics, and the effect of improving the magnetic characteristics is reduced.

In patent document 1, a configuration of a flow path is described in which, in order to prevent erosion of a thin-walled portion of an outer core, an excluded fluid when moving an armature passes through a through-hole provided in the armature, not through a narrow passage on the outer peripheral side of the armature portion as much as possible. However, from the standpoint of responsiveness of the solenoid, no specific configuration is mentioned with respect to the flow path optimization specific to the different individual structures.

Accordingly, an object of the present invention is to provide a high-pressure fuel supply pump including an electromagnetic intake valve that reduces fluid resistance of a flow path in a solenoid and improves flow rate control performance.

Means for solving the problems

In order to solve the above problem, a high-pressure fuel supply pump according to the present invention includes: a valve element that opens and closes the flow path; a valve stem that applies force to the valve element; a spring portion that urges a spring receiving surface of an outer diameter convex portion (flange portion) of the valve rod; and a movable part configured to be separated from the valve rod and configured to be driven by being engaged with an outer diameter convex part engaging surface of the outer diameter convex part (flange part) of the valve rod; the movable portion is provided with a communication hole through which fuel in a spring space in which the spring portion is disposed flows when the movable portion is attracted to and moves by the fixed portion, and a minimum cross-sectional area of the communication hole as viewed in the axial direction is formed to be larger than a minimum cross-sectional area of a gap between the movable portion and the outer peripheral portion.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention thus constituted, a high-pressure fuel supply pump equipped with an electromagnetic intake valve that reduces the fluid resistance of a flow path in a solenoid and improves the flow rate control performance is provided. The constitution, operation and effect of the present invention other than the above will be explained in detail in the following examples.

Drawings

Fig. 1 shows a cross-sectional view of a high-pressure fuel supply pump of an embodiment of the invention.

Fig. 2 shows the entire configuration of the high-pressure fuel supply system according to the embodiment of the invention.

Fig. 3 shows a sectional view of the high-pressure fuel supply pump according to the embodiment of the present invention when it is installed.

Fig. 4 is a cross-sectional view of the solenoid valve according to the embodiment of the present invention in the intake stroke.

Fig. 5 is a cross-sectional view of a discharge stroke and energization of the solenoid valve according to the embodiment of the present invention.

Fig. 6 is a cross-sectional view of the solenoid valve according to the embodiment of the present invention in a discharge stroke and at a time of non-energization.

Fig. 7 shows an operation timing chart of the solenoid valve according to the embodiment of the present invention.

Fig. 8 is a radial cross-sectional view of the solenoid valve according to the embodiment of the present invention including the armature through hole.

Fig. 9 is an axial cross-sectional view of the solenoid valve according to the embodiment of the present invention when the armature is not attracted.

Fig. 10 is an axial sectional view of a solenoid valve according to an embodiment of the present invention, showing the attraction of an armature.

Detailed Description

The invention will be described in detail below with reference to an embodiment shown in the drawings.