Dome type buffer assembly of high-pressure fuel pump assembly

Abstract

The utility model relates to a dome type buffer component of a high-pressure fuel pump assembly, which comprises a covered bowl, a support spring and a buffer, the buffer is arranged in the covered bowl through the support spring, the covered bowl is of a dome type structure and comprises a containing section and a support dome which are connected with each other, and the support dome is arranged in the containing section. A supporting step matched with the buffer in shape is arranged in the supporting dome, one end of the buffer abuts against the supporting step, and the other end of the buffer is in contact connection with the supporting spring. Compared with the prior art, due to the arrangement of the supporting dome, the fixing structure of the buffer is simplified, the buffer can be installed more conveniently and quickly, the supporting stability of the buffer is higher, and the noise reduction capacity of the buffer assembly cannot be affected.

Description

Technical Field

[0001] The utility model relates to the field of fuel pump structures, in particular to a dome-type buffer component of a high-pressure fuel pump assembly. Background Art

[0002] More and more engines are using direct injection fuel system design, and direct injection usually uses a high-pressure fuel pump to provide high-pressure fuel into the combustion chamber, and through precise electronic injection control and nozzle design, the fuel is atomized to the best state suitable for combustion. However, as a key part of the direct injection fuel system, the high-pressure fuel pump will emit a crisp metal impact sound when working, affecting driving comfort, so the noise reduction treatment of the fuel pump is very important.

[0003] At present, the noise reduction of fuel pump is mostly achieved through buffers, such as Figure 1 As shown, the existing buffer assembly consists of 1 cover bowl, 2 support springs and 1 buffer. The cover bowl is a flat top design. The buffer can meet the noise level requirements of most customers through two support springs.

[0004] However, the structure of the above-mentioned buffer assembly requires fixing the buffer by two supporting springs, which makes the installation of the structure more complicated, and the stability of the buffer assembly with two supporting springs symmetrically installed needs to be improved. Utility Model Content

[0005] The purpose of the utility model is to provide a dome-type buffer component of a high-pressure fuel pump assembly in order to overcome the defect that the buffer is fixed by two supporting springs in the above-mentioned prior art using a flat-top cover bowl to assist in fixing the buffer, resulting in a more complicated installation structure.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A dome-type buffer component of a high-pressure fuel pump assembly includes a cover bowl, a support spring and a buffer. The buffer is installed in the cover bowl through the support spring. The cover bowl is a dome-type structure, including a receiving section and a support dome connected to each other. A support step matching the shape of the buffer is provided in the support dome. One end of the buffer rests on the support step, and the other end contacts and connects to the support spring.

[0008] Preferably, the cross-sections of the inner cavities of the support dome and the accommodating section are both circular, the diameter of the inner cavity of the support dome is smaller than the diameter of the inner cavity of the accommodating section, and the support step is located at the connection between the support dome and the accommodating section.

[0009] Preferably, the inner cavity of the support dome and the inner cavity of the accommodating section are coaxially arranged.

[0010] Preferably, the supporting step is an annular structure, and a supporting ring matching the supporting step is provided on the outer side of the buffer, and the inner ring diameter of the supporting step is smaller than the diameter of the supporting ring.

[0011] Preferably, the outer diameter of the support ring is larger than the inner diameter of the support spring.

[0012] Preferably, a chamfer is provided at a connection between the supporting step and the supporting dome.

[0013] Preferably, the diameter of the inner cavity of the support dome is larger than the diameter of the upper end of the buffer, and the upper end of the buffer is located in the cavity of the support dome.

[0014] Preferably, the support dome comprises a fixing boss, the fixing boss is located outside the lid bowl, one side of the fixing boss is connected to the accommodating section, and the other side of the fixing boss is connected to the support dome.

[0015] Preferably, the outer surface of the fixing boss is in an arc shape, and the arc surface where the fixing boss is located coincides with the arc surface where the side surface of the accommodating section is located.

[0016] Preferably, one end of the support dome away from the accommodating section is in the shape of a conical boss.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] (1) The dome-shaped lid bowl of the present invention is provided with a support dome above the accommodating section where the buffer and the support spring are placed. The upper end of the buffer is supported and limited by a support step inside the support dome that cooperates with the buffer, and the lower end of the buffer is supported and limited by a support spring provided in the accommodating section. The buffer is supported and fixed by the support dome and the support spring.

[0019] By adopting a dome-type lid bowl top structure, a supporting step is formed on the lid bowl top, and the supporting step can support and limit the upper end of the buffer placed in the accommodating section, and cooperate with the supporting spring arranged at the lower end to complete the support of the buffer; compared with the existing structure that supports the buffer by two supporting springs, the setting of the supporting dome simplifies the fixing structure of the buffer, makes the installation of the buffer more convenient and quick, and the buffer support is more stable, and will not affect the noise reduction ability of the buffer component.

[0020] (2) The reserved space set in the cavity of the supporting dome of this scheme enables the upper end of the buffer to be fixed on the supporting step through the support ring, while the upper end of the buffer is located in the cavity, ensuring that the noise reduction ability of the buffer component is not affected. On the other hand, it cooperates with the fixed boss on one side of the supporting dome to ensure the stability of the supporting dome structure and the reliability of the buffer component. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of an existing buffer component;

[0022] Figure 2 A schematic cross-sectional view of the dome-type buffer assembly provided by the utility model;

[0023] Figure 3 A schematic diagram of the structure of the dome-type buffer assembly provided by the utility model;

[0024] In the figure: 1, lid bowl, 2, buffer, 3, support spring, 11, accommodating section, 12, support dome, 13, fixing boss. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] 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, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0029] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] Example 1

[0032] like Figure 2 As shown, this embodiment provides a dome-type buffer component of a high-pressure fuel pump assembly, including a cover bowl 1, a support spring 3 and a buffer 2. The buffer 2 is installed in the cover bowl 1 through the support spring 3. The cover bowl 1 is a dome-type structure, including a receiving section 11 and a support dome 12 that are connected to each other. A support step that matches the shape of the buffer 2 is provided in the support dome 12. One end of the buffer 2 rests on the support step, and the other end contacts and connects to the support spring 3.

[0033] Working principle: The dome-shaped covered bowl 1 is provided with a support dome 12 above the accommodating section 11 where the buffer 2 and the support spring 3 are placed. The upper end of the buffer 2 is supported and limited by a support step inside the support dome 12 that cooperates with the buffer 2, and the lower end of the buffer 2 is supported and limited by the support spring 3 provided in the accommodating section 11. The buffer 2 is supported and fixed by the support dome 12 and the support spring 3.

[0034] The lid bowl 1 with a dome-shaped structure of the present invention is provided with a support dome 12 above the accommodating section 11 where the buffer 2 and the support spring 3 are placed. The upper end of the buffer 2 is supported and limited by a support step inside the support dome 12 that cooperates with the buffer 2, and the lower end of the buffer 2 is supported and limited by the support spring 3 provided in the accommodating section 11. The buffer 2 is supported and fixed by the support dome 12 and the support spring 3.

[0035] By adopting a dome-shaped top structure of the lid bowl 1, a supporting step is formed on the top of the lid bowl 1. The supporting step can support and limit the upper end of the buffer 2 placed in the accommodating section 11, and cooperate with the supporting spring 3 arranged at the lower end to complete the support of the buffer. Compared with the existing structure that supports the buffer by two supporting springs, the setting of the supporting dome 12 simplifies the fixing structure of the buffer 2, makes the installation of the buffer 2 more convenient and quick, and the support stability of the buffer 2 is stronger, and will not affect the noise reduction ability of the buffer component.

[0036] In a preferred embodiment, the cross-sections of the inner cavities of the support dome 12 and the accommodating section 11 are both circular, the diameter of the inner cavity of the support dome 12 is smaller than the diameter of the inner cavity of the accommodating section 11, and the support step is located at the connection between the support dome 12 and the accommodating section 11.

[0037] Specifically, the inner cavity of the support dome 12 and the inner cavity of the accommodating section 11 are coaxially arranged. The support step is an annular structure, and a support ring matching the support step is arranged on the outer side of the buffer 2, and the inner ring diameter of the support step is smaller than the diameter of the support ring. The outer diameter of the support ring is larger than the inner diameter of the support spring 3. A chamfer is arranged at the connection between the support step and the support dome 12.

[0038] The reserved space set in the cavity of the supporting dome enables the upper end of the buffer to be fixed on the supporting step through the supporting ring, while the upper end of the buffer is located in the cavity, ensuring that the noise reduction ability of the buffer component is not affected. On the other hand, the fixed boss on one side of the supporting dome is used to ensure the stability of the supporting dome structure and the reliability of the buffer component.

[0039] like Figure 3 As shown, the inner cavity diameter of the support dome 12 is larger than the diameter of the upper end of the buffer 2, and the upper end of the buffer 2 is located in the cavity of the support dome 12. The support dome 12 includes a fixing boss 13, which is located outside the lid bowl 1, and one side of the fixing boss 13 is connected to the accommodating section 11, and the other side is connected to the support dome 12.

[0040] The outer surface of the fixing boss 13 is in an arc shape, and the arc surface where the fixing boss 13 is located coincides with the arc surface where the side surface of the accommodating section 11 is located. The end of the supporting dome 12 away from the accommodating section 11 is in the shape of a conical boss.

[0041] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A dome-type buffer assembly of a high-pressure fuel pump assembly, comprising a cover bowl (1), a support spring (3) and a buffer (2), wherein the buffer (2) is installed in the cover bowl (1) through the support spring (3), characterized in that: The lid bowl (1) is a dome-shaped structure, comprising a receiving section (11) and a supporting dome (12) connected to each other, wherein a supporting step matching the shape of the buffer (2) is provided in the supporting dome (12), and one end of the buffer (2) abuts against the supporting step, and the other end contacts and connects with the supporting spring (3).

2. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 1, characterized in that: The cross-sections of the inner cavities of the support dome (12) and the accommodating section (11) are both circular, the diameter of the inner cavity of the support dome (12) is smaller than the diameter of the inner cavity of the accommodating section (11), and the support step is located at the connection between the support dome (12) and the accommodating section (11).

3. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 2, characterized in that: The inner cavity of the support dome (12) and the inner cavity of the accommodating section (11) are coaxially arranged.

4. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 2, characterized in that: The support step is an annular structure, and a support ring matching the support step is provided on the outer side of the buffer (2), and the inner ring diameter of the support step is smaller than the diameter of the support ring.

5. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 4, characterized in that: The outer diameter of the support ring is greater than the inner diameter of the support spring (3).

6. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 2, characterized in that: A chamfer is provided at the connection between the supporting step and the supporting dome (12).

7. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 2, characterized in that: The diameter of the internal cavity of the support dome (12) is greater than the diameter of the upper end of the buffer (2), and the upper end of the buffer (2) is located in the cavity of the support dome (12).

8. The dome-type buffer assembly of a high-pressure fuel pump assembly according to claim 1, characterized in that: The supporting dome (12) comprises a fixing boss (13), wherein the fixing boss (13) is located outside the lid bowl (1), and one side of the fixing boss (13) is connected to the accommodating section (11), and the other side is connected to the supporting dome (12).

9. A dome-type buffer assembly for a high-pressure fuel pump assembly according to claim 8, characterized in that: The outer surface of the fixing boss (13) is in an arc shape, and the arc surface where the fixing boss (13) is located coincides with the arc surface where the side surface of the accommodating section (11) is located.

10. The dome-type buffer assembly of a high-pressure fuel pump assembly according to claim 1, characterized in that: The end of the support dome (12) away from the accommodating section (11) is in the shape of a conical boss.

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