KR-20260062386-A - FLOW CONTROL VALVE FOR HIGH PRESSURE FUEL PUMP

KR20260062386AKR 20260062386 AKR20260062386 AKR 20260062386AKR-20260062386-A

Abstract

The present invention relates to a flow control valve for a high-pressure fuel pump. In the flow control valve for a high-pressure fuel pump according to the present invention, when the inlet valve closes, the armature retracts toward the pole core, and the armature is supported by a return spring, wherein the return spring is composed of a first section and a second section with different stiffnesses so that the pole core and the armature can maintain a non-contact state, thereby preventing impact noise from occurring.

Inventors

한경철
김진성
곽규정

Assignees

주식회사 현대케피코

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (10)

In a flow control valve for a high-pressure fuel pump for compressing supplied low-pressure fuel to high pressure, When the inlet valve closes, the armature retracts toward the pole core, and the armature is supported by a return spring, wherein the return spring is composed of a first section and a second section with different stiffnesses so that the pole core and the armature can maintain a non-contact state. A flow control valve for a high-pressure fuel pump characterized by
In paragraph 1, The first section above is formed with a smaller pitch compared to the second section above. Flow control valve for a high-pressure fuel pump.
In paragraph 1, The above return spring is manufactured from a single material such that the first section and the second section are continuous. Flow control valve for a high-pressure fuel pump.
In paragraph 1, The above return spring is such that the first spring forming the first section and the second spring forming the second section are physically coupled coaxially with each other. Flow control valve for a high-pressure fuel pump.
In paragraph 4, The first spring and the second spring are manufactured of different materials and have different stiffnesses. Flow control valve for a high-pressure fuel pump.
In any one of paragraphs 1 through 5, The stiffness of the first section is smaller than the stiffness of the second section, so that when the armature retracts, the first section is compressed first. Flow control valve for a high-pressure fuel pump.
In any one of paragraphs 1 through 5, The end of the first section is supported by an end cap inserted into the pole core, and the end of the second section is in contact with the armature. Flow control valve for a high-pressure fuel pump.
In any one of paragraphs 1 through 5, A coil portion is provided on the outer side of the pole core, and when current is applied to the coil portion, the pole core is magnetized to retract the armature, and the compression of the first section is performed first, followed by the compression of the second section, so that the inlet valve is closed. Flow control valve for a high-pressure fuel pump.
In paragraph 8, The above return spring stops the retraction of the armature at the point where the reaction force generated during compression of the second section is equal to the magnetic force formed by the current applied to the coil section. Flow control valve for a high-pressure fuel pump.
In any one of paragraphs 1 through 5, The maximum separation distance between the above armature and the above pole core is greater than the maximum separation distance between the above inlet valve and the valve seat. Flow control valve for a high-pressure fuel pump.

Description

Flow control valve for high-pressure fuel pump The present invention relates to a flow control valve for a high-pressure fuel pump for compressing low-pressure fuel to be supplied to an automobile engine to a high pressure. According to the prior art, a GDI engine of an automobile compresses fuel pumped by a low-pressure pump to a high pressure and then supplies it into the engine. A high-pressure fuel pump for compressing low-pressure fuel to a high pressure includes a damper, a flow control valve, a compression chamber operated by a cam, and a check valve for sending the compressed fuel to the engine. The flow control valve is an essential component when compressing low-pressure fuel to high pressure in a high-pressure fuel pump, and there was a problem with noise being generated during the operation of the flow control valve. To solve this, a technology was applied to reduce the impact noise generated in the flow control valve by using fluid damping or current waveform control. However, there is a problem in that the impact noise caused by the direct collision between the armature and pole core of the flow control valve, which is the actual cause of the noise, remains unresolved. FIG. 1 illustrates an example of the installation of a flow control valve for a high-pressure fuel pump according to an embodiment of the present invention. FIG. 2 illustrates a schematic diagram showing the actual application of a flow control valve for a high-pressure fuel pump according to an embodiment of the present invention. Figure 3 shows an enlarged cross-section of a flow control valve. Figure 4 shows an enlarged view of a return spring applied to a flow control valve. FIG. 5 illustrates another embodiment of a return spring that can be applied to a flow control valve. The aforementioned objectives of the present invention, as well as other objectives, advantages, and features, and the methods for achieving them, will become clear from the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms, and the following embodiments are provided merely to easily inform those skilled in the art of the purpose, structure, and effects of the invention, and the scope of the rights of the present invention is defined by the description in the claims. Meanwhile, the terms used in this specification are for describing the embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used in this specification, "comprises" and/or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and/or elements to the mentioned components, steps, actions, and/or elements. FIG. 1 illustrates an example of installation of a flow control valve for a high-pressure fuel pump according to an embodiment of the present invention, and FIG. 2 illustrates a schematic diagram of the actual application of a flow control valve for a high-pressure fuel pump according to an embodiment of the present invention. As described above, a flow control valve for a high-pressure fuel pump according to an embodiment of the present invention is installed on one side of the body (1100) of the high-pressure fuel pump (1000). A damper (1200) is provided at the top of the body (1100) of the high-pressure fuel pump (1000), and a piston (1400) connected to a cam (1300) and reciprocating up and down is provided at the bottom of the body (1100), and the top of the piston (1400) leads to a compression chamber (1101). A flow control valve (1500) is connected to the right side of the compression chamber (1101) in the drawing, and a check valve (1600) facing the discharge port of the compressed fuel is provided to the left side of the compression chamber (1101). When fuel is pumped and supplied from the low-pressure pump (2000), a portion of the low-pressure fuel flows into the damper (1200) and then passes through the flow path to the inlet of the flow control valve (1500). When the low-pressure fuel is supplied to the high-pressure fuel pump (1000), the piston (1400) is used at the bottom dead center, and the low-pressure fuel supplied to the flow control valve (15000) flows into the compression chamber (1101). At this time, the inlet valve (1520) of the flow control valve (1500) is open. In order to compress the low-pressure fuel flowing into the compression chamber (1101) to a high pressure, the inlet valve (1520) of the flow control valve (1500) is closed, and the piston (1400) rises to compress the low-pressure fuel in the compression chamber (1101) to a high pressure, and then the check valve (1600) opens and the high-pressure fuel is discharged. As such, the flow control valve for the high-pressure fuel pump of the present invention is a key element for compressing lo