High-pressure fuel pump

Abstract

The high-pressure fuel pump comprises a pump body, a plunger assembly, an overflow valve assembly, a shock absorber assembly, an oil outlet valve and an oil outlet, the oil outlet valve is arranged in the pump body and comprises an original valve body, a valve body extension portion, a connecting portion, a limiting portion and a limiting installation portion, an oil outlet channel is formed in the oil outlet valve, and the plunger assembly is arranged in the oil outlet channel. An oil outlet valve ball is arranged at one end of the oil outlet channel, the oil outlet valve ball is arranged in the limiting part, the valve body extension part is arranged between the original valve body and the limiting mounting part, the limiting part is tightly buckled with the limiting mounting part, an oil outlet is formed in one end of the oil outlet valve, the connecting part is arranged on the original valve body, and the connecting part is connected with the pump body and the oil outlet valve. Compared with the prior art, the press fitting device has the advantages of improving the stability of the oil valve and the pump body in the press fitting process and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, and in particular to a high-pressure fuel pump. Background Art

[0002] A high-pressure fuel pump is a fundamental component of the fuel injection system in electronic fuel injection vehicles. Its function is to provide power to the hydraulic system. Its operating principle is that as the rotor disk rotates, the centrifugal force pushes the rollers outward, acting like a rotating oil seal. As the rotor spins, the pump activates, drawing fuel from the inlet and forcing it into the fuel system through the outlet. The outlet valve in the high-pressure fuel pump is a crucial component. During installation, it must be pressed into the pump body, and the two components must be sealed to prevent leakage.

[0003] In existing high-pressure fuel pumps, due to the small press-fit area of ​​the pump body, the pressing force between the oil valve and the pump body is insufficient, the sealing between the pump body and the oil outlet valve is not good, the oil outlet valve and the pump body are prone to loosening, and the stability of the oil valve and pump body during the press-fit process is poor. Utility Model Content

[0004] The purpose of the utility model is to provide a high-pressure fuel pump in order to improve the stability of the fuel valve and the pump body during the press-fitting process.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A high-pressure fuel pump comprises a pump body, a plunger assembly, a relief valve assembly, a shock absorber assembly, an oil outlet valve and an oil outlet, wherein the oil outlet valve is arranged inside the pump body, and the oil outlet valve comprises an original valve body, a valve body extension, a connecting part, a limiting part and a limiting mounting part. An oil outlet channel is opened in the oil outlet valve, an oil outlet valve ball is provided at one end of the oil outlet channel, the oil outlet valve ball is arranged in the limiting part, the valve body extension is arranged between the original valve body and the limiting mounting part, the limiting part is tightly fastened to the limiting mounting part, an oil outlet is provided at one end of the oil outlet valve, the connecting part is arranged on the original valve body, and the connecting part connects the pump body and the oil outlet valve.

[0007] Furthermore, a plunger assembly is provided on the pump body, and the plunger assembly includes a semi-cone, a plunger spring and a plunger spring retainer.

[0008] Furthermore, the pump body is provided with a flange and a sealing cap.

[0009] Furthermore, a sealing ring is provided on one side of the plunger spring.

[0010] Furthermore, a relief valve assembly is provided on the opposite side of the oil outlet valve of the pump body, and a coil is provided on the relief valve assembly.

[0011] Furthermore, the relief valve assembly includes a relief valve spring and a relief valve body.

[0012] Furthermore, an oil inlet valve is provided on a side opposite to the oil outlet of the oil outlet valve.

[0013] Furthermore, a shock absorber assembly is provided on the pump body.

[0014] Furthermore, the shock absorber assembly includes a shock absorber cover and a shock absorber.

[0015] Furthermore, the oil outlet channel passes through the original valve body, the valve body extension portion and the limit installation portion.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model increases the press-fitting area of ​​the pump body and the oil outlet valve by adding an extension portion to the valve body of the oil outlet valve, thereby increasing the pressing force between the oil outlet valve and the pump body, and improving the sealing between the pump body and the oil outlet valve without causing additional contaminant problems, and can effectively improve the stability between the press-fitted parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is a specific structural diagram of the oil outlet valve of the utility model;

[0020] In the figure, 1-oil outlet; 2-semi-cone; 3-flange; 4-plunger spring; 5-plunger spring retainer; 6-sealing cap; 7-pump body; 8-plunger assembly; 9-original valve body; 10-sealing ring; 11-valve body extension; 12-relief valve assembly; 13-relief valve spring; 14-coil; 15-relief valve body; 16-oil inlet valve; 17-shock absorber assembly; 18-shock absorber cover; 19-shock absorber; 20-oil outlet valve; 21-connecting part; 22-limiting part; 23-oil outlet channel; 24-oil outlet valve ball; 25-limiting mounting part. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0022] Due to performance improvements and design changes, the current high-pressure fuel pump requires a completely new design for its delivery valve. This valve needs to be pressed into the pump body, ensuring a leak-proof seal between the two components. Existing high-pressure fuel pumps suffer from insufficient press-fit area between the pump body and the delivery valve, leading to looseness between the valve and the pump body. This seal cannot be guaranteed, resulting in poor product performance.

[0023] The utility model proposes a high-pressure fuel pump. The overall cross-sectional view of the utility model is as follows Figure 1 As shown, it includes a pump body 7, a plunger assembly 8, a relief valve assembly 12, a shock absorber assembly 17, an oil outlet valve 20 and an oil outlet 1, wherein the oil outlet valve 20 is arranged inside the pump body 7, and the oil outlet valve 20 includes an original valve body 9, a valve body extension 11, a connecting portion 21, a limiting portion 22 and a limiting mounting portion 25. An oil outlet channel 23 is opened in the oil outlet valve 20, and an oil outlet valve ball 24 is provided at one end of the oil outlet channel 23. The oil outlet valve ball 24 is arranged in the limiting portion 22, and the valve body extension 11 is arranged between the original valve body 9 and the limiting mounting portion 25. The limiting portion 22 is tightly fastened to the limiting mounting portion 25. An oil outlet 1 is provided at one end of the oil outlet valve 20, and the connecting portion 21 is arranged on the original valve body 9. The connecting portion 21 connects the pump body 7 and the oil outlet valve 20. Figure 1 Correspondingly, the detailed diagram of the oil outlet valve 20 is as follows: Figure 2 The specific extended part diagram is shown in Figure 2 The circled part is shown in the middle.

[0024] The pump body 7 is provided with a plunger assembly 8 , which includes a semi-cone 2 , a plunger spring 4 and a plunger spring retainer 5 .

[0025] The pump body 7 is provided with a flange 3 and a sealing cap 6 .

[0026] A sealing ring 10 is provided on one side of the plunger spring 4.

[0027] An overflow valve assembly 12 is provided on the opposite side of the oil outlet valve 20 of the pump body 7 , and a coil 14 is provided on the overflow valve assembly 12 .

[0028] The relief valve assembly 12 includes a relief valve spring 13 and a relief valve body 15.

[0029] An oil inlet valve 16 is provided on the side of the oil outlet valve 20 opposite to the oil outlet 1 .

[0030] The pump body 7 is provided with a shock absorber assembly 17 .

[0031] The shock absorber assembly 17 includes a shock absorber cover 18 and a shock absorber 19 .

[0032] The oil outlet passage 23 passes through the original valve body 9 , the valve body extension portion 11 and the position limiting mounting portion 25 .

[0033] The outlet valve 20 of the present invention incorporates an additional valve extension 11, thereby increasing the press-fit area of ​​the pump body, enhancing the pressing force between the outlet valve and the pump body, and improving the seal between the pump body and the outlet valve without causing additional contamination. By increasing the outlet valve's press-fit lead-in length, the stability of the outlet valve and pump body during the press-fit process is improved. Including force and displacement monitoring during the press-fit lead-in phase in the press-fit curve allows for the timely detection of defective parts.

[0034] The working principle of this utility model is:

[0035] External oil enters the oil inlet passage of pump body 7, passes through oil inlet valve 16, and enters oil outlet valve 20, gradually filling oil outlet passage 23 and pressing against oil outlet valve ball 24 until it pushes oil outlet valve ball 24 out of oil outlet passage 23. Oil then flows out of oil outlet port 1, completing oil discharge. During this process, the presence of the valve body extension lengthens the entire valve body, and consequently, the oil outlet passage 23. This increases the press-fit area of ​​the pump body and increases the pressing force between the oil outlet valve and the pump body. Therefore, during the press-fit process, the seal between the pump body and the oil outlet valve is enhanced, improving the stability of the oil outlet valve and pump body during press-fit.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0037] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0038] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A high-pressure fuel pump, characterized in that: The invention comprises a pump body (7), a plunger assembly (8), a relief valve assembly (12), a shock absorber assembly (17), an oil outlet valve (20) and an oil outlet (1), wherein the oil outlet valve (20) is arranged inside the pump body (7), the oil outlet valve (20) comprises an original valve body (9), a valve body extension portion (11), a connecting portion (21), a limiting portion (22) and a limiting mounting portion (25), an oil outlet channel (23) is opened in the oil outlet valve (20), and the oil outlet channel (23) is provided with a plurality of oil outlet channels. 3) is provided with an oil outlet valve ball (24), the oil outlet valve ball (24) is arranged in the limiting portion (22), the valve body extension portion (11) is arranged between the original valve body (9) and the limiting mounting portion (25), the limiting portion (22) is tightly attached to the limiting mounting portion (25), one end of the oil outlet valve (20) is provided with an oil outlet (1), the connecting portion (21) is arranged on the original valve body (9), and the connecting portion (21) connects the pump body (7) and the oil outlet valve (20).

2. A high-pressure fuel pump according to claim 1, characterized in that: The pump body (7) is provided with a plunger assembly (8), and the plunger assembly (8) comprises a semi-cone (2), a plunger spring (4) and a plunger spring retainer (5).

3. A high-pressure fuel pump according to claim 1, characterized in that: The pump body (7) is provided with a flange (3) and a sealing cap (6).

4. A high-pressure fuel pump according to claim 1, characterized in that: A sealing ring (10) is provided on one side of the plunger spring (4).

5. A high-pressure fuel pump according to claim 1, characterized in that: An overflow valve assembly (12) is provided on the opposite side of the oil outlet valve (20) of the pump body (7), and a coil (14) is provided on the overflow valve assembly (12).

6. A high-pressure fuel pump according to claim 5, characterized in that: The relief valve assembly (12) comprises a relief valve spring (13) and a relief valve body (15).

7. A high-pressure fuel pump according to claim 1, characterized in that: An oil inlet valve (16) is provided on the side of the oil outlet valve (20) opposite to the oil outlet port (1).

8. A high-pressure fuel pump according to claim 1, characterized in that: A shock absorber assembly (17) is provided on the pump body (7).

9. A high-pressure fuel pump according to claim 8, characterized in that: The shock absorber assembly (17) includes a shock absorber cover (18) and a shock absorber (19).

10. The high-pressure fuel pump according to claim 1, characterized in that: The oil outlet channel (23) passes through the original valve body (9), the valve body extension portion (11) and the position limiting installation portion (25).

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