Press fitting, positioning and correcting device for oil inlet valve

Abstract

The utility model relates to a press-fitting, positioning and correcting device for an oil inlet valve. The press-fitting, positioning and correcting device comprises a positioning base and an elastic guide pin, a positioning step is arranged on one side, close to the surface of the oil pump, of the mounting hole; the positioning base is matched with the positioning step; the elastic guide pin is installed in the positioning base, one end of the elastic guide pin extends out of the positioning base and penetrates through a center hole of the oil inlet valve, and the length of the elastic guide pin extending out of the positioning base is larger than the thickness of the oil inlet valve. Compared with the prior art, the elastic guide pin is arranged on the positioning base, when the oil inlet valve is mounted on an oil pump body, the elastic guide pin firstly abuts against a mounting hole in the oil pump, the elastic guide pin gradually retracts and is always located in the center of the oil inlet valve in the mounting process of the oil inlet valve, and the coaxiality of the oil inlet valve and the mounting hole in the press mounting process is guaranteed; and the positioning base is matched with the positioning step, so that the elastic guide pin can be kept stable, and press fitting deflection is prevented.

Description

Technical Field

[0001] The utility model relates to oil pump assembly, in particular to a press-fit positioning and correction device for an oil inlet valve. Background Art

[0002] The fuel pump's inlet valve is a key component in the fuel system. Its primary function is to distribute fuel to the plunger pump, ensuring smooth fuel flow into the pump's oil chamber. The pump's inlet valve components typically include the inlet valve ball, inlet valve seat, return spring, and inlet valve chamber. These components work together to ensure the inlet valve opens and closes properly.

[0003] Due to the high dimensional matching accuracy (micron level) between the outer diameter of the oil inlet valve and the oil inlet valve mounting hole of the oil pump body, the centering position of the current fixture cannot meet the requirements and cannot ensure that the oil inlet valve and the oil pump body are completely aligned during press fitting, resulting in problems such as poor press fitting position during the product press fitting process, causing damage to the product and resulting in a high product press fitting scrap rate.

[0004] In summary, how to design a press-fitting positioning device that can facilitate the centering of the oil inlet valve and the oil pump body during press-fitting is a technical problem that needs to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide a press-fit positioning and correction device for an oil inlet valve in order to overcome the defect in the prior art that the centering position cannot meet the requirements.

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

[0007] According to one aspect of the utility model, a press-fit positioning and correction device for an oil inlet valve is provided, which is used for installing the oil inlet valve and an oil pump body, wherein the oil pump body is provided with a mounting hole, and the correction device comprises a positioning base and an elastic guide pin; a positioning step is provided on the side of the mounting hole close to the surface of the oil pump, and the positioning base cooperates with the positioning step; the elastic guide pin is installed in the positioning base, with one end extending out of the positioning base and passing through the center hole of the oil inlet valve, and the length of the elastic guide pin extending out of the positioning base is greater than the thickness of the oil inlet valve.

[0008] As a preferred technical solution, the elastic guide pin includes an elastic element, a guide pin and a shell. The shell is installed in the positioning base, and one end extends out of the positioning base. The elastic element and the guide pin are connected and installed together in the shell, and one end of the guide pin extends out of the shell; the end face of the shell extending out of the guide pin presses against the end face of the oil inlet valve.

[0009] As a preferred technical solution, a cavity is provided in the positioning base, and the shell is installed in the cavity.

[0010] As a preferred technical solution, the cavity includes a first cylindrical cavity portion and a second cylindrical cavity portion with coinciding axes, the first cylindrical cavity portion is away from the oil inlet valve and has a diameter larger than the second cylindrical cavity portion, and the end of the shell away from the oil inlet valve is provided with an annular protrusion, and the annular protrusion is located in the first cylindrical cavity portion.

[0011] As a preferred technical solution, the annular protrusion forms a moving pair with the first cylindrical cavity portion, and the portion of the shell other than the annular protrusion forms a moving pair with the second cylindrical cavity portion.

[0012] As a preferred technical solution, the thickness of the annular protrusion is smaller than the height of the first cylindrical cavity; and the shell is fixedly connected to the guide pin.

[0013] As a preferred technical solution, one end of the elastic element is connected to the guide pin, and the other end is fixedly connected to the surface of the first cylindrical cavity away from the guide pin.

[0014] As a preferred technical solution, the elastic element is a compression spring.

[0015] As a preferred technical solution, the positioning base is a cube with a cylindrical protrusion provided on the surface; the elastic guide pin extends from the protrusion.

[0016] As a preferred technical solution, the raised edge is provided with rounded corners.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The utility model provides an elastic guide pin on the positioning base. When the oil inlet valve is installed on the oil pump body, the elastic guide pin first abuts against the mounting hole on the oil pump. During the installation of the oil inlet valve, the elastic guide pin gradually retracts and remains located at the center of the oil inlet valve, ensuring the coaxiality of the oil inlet valve and the mounting hole during press-fitting. The positioning base cooperates with the positioning step to keep the elastic guide pin stable and prevent deflection during press-fitting.

[0019] 2) The positioning elastic guide pin of the utility model includes a shell, the annular protrusion of the shell moves with the extension and contraction of the guide pin, and the other end of the shell abuts the end face of the oil inlet valve, making the press-fitting process more stable; two cylindrical cavities with different diameters are provided in the positioning base to limit the movement of the positioning pin and stabilize the press-fitting process; the positioning base is provided with a cylindrical protrusion, and the edge of the protrusion is provided with a rounded corner for easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a press-fit positioning and correction device for an oil inlet valve according to the utility model;

[0021] The numbers in the figure show:

[0022] 1. Positioning base, 11. Cavity, 111. First cylindrical cavity portion, 112. Second cylindrical cavity portion, 2. Elastic guide pin, 21. Elastic element, 22. Guide pin, 23. Shell, 231. Annular protrusion. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] like Figure 1 As shown, the utility model provides a press-fit positioning and correction device for an oil inlet valve, comprising a positioning base 1 and an elastic guide pin 2. The utility model is used for installing the oil inlet valve and an oil pump body. The oil pump body is provided with a mounting hole, and the oil inlet valve is installed in the mounting hole.

[0025] The positioning base 1 is a cubical structure with a cylindrical protrusion on its surface, and the edges of the protrusion are rounded. A cavity 11 is located within the positioning base 1. Cavity 11 comprises a first cylindrical cavity portion 111 and a second cylindrical cavity portion 112, whose axes coincide with each other. The first cylindrical cavity portion 111 is located at the bottom, while the second cylindrical cavity portion 112 is located at the top. The diameter of the first cylindrical cavity portion 111 is larger than that of the second cylindrical cavity portion 112. A positioning step is provided on the side of the mounting hole closest to the oil pump surface, and the positioning base 1 cooperates with the positioning step.

[0026] The elastic guide pin 2 includes an elastic element 21, a guide pin 22 and a shell 23. The shell 23 is installed in the cavity 11 of the positioning base 1, and one end extends from the cylindrical protrusion of the positioning base 1. The shell 23 is a cylinder with an annular protrusion 231 at the bottom. The annular protrusion 231 is located in the first cylindrical cavity 111. The thickness of the annular protrusion 231 is less than the height of the first cylindrical cavity 11. The annular protrusion 231 forms a moving pair with the first cylindrical cavity 111. The part of the shell 23 except the annular protrusion 231 is in contact with the second cylindrical cavity 11. 2 forms a moving pair; a step is formed between the end of the housing 23 extending out of the guide pin 22 and the guide pin 22, and the step surface abuts the end face of the oil inlet valve; one end of the elastic element 21 is connected to the guide pin 22, and the other end is fixedly connected to the bottom surface of the first cylindrical cavity. The elastic element 21 and the guide pin 22 are installed together in the housing 23, and the elastic element 21 can be an optional compression spring; one end of the guide pin 22 extends out of the housing 23, and the housing 23 is fixedly connected to the guide pin 22. The guide pin 22 passes through the center hole of the oil inlet valve. The length of the guide pin 22 extending out of the housing 23 is greater than the thickness of the oil inlet valve.

[0027] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A press-fit positioning and correction device for an oil inlet valve, used for installing the oil inlet valve and an oil pump body, wherein the oil pump body is provided with a mounting hole, characterized in that: The correction device comprises a positioning base (1) and an elastic guide pin (2); a positioning step is provided on the side of the mounting hole close to the surface of the oil pump, and the positioning base (1) cooperates with the positioning step; the elastic guide pin (2) is mounted in the positioning base (1), one end of which extends out of the positioning base (1) and passes through the center hole of the oil inlet valve, and the length of the elastic guide pin (2) extending out of the positioning base (1) is greater than the thickness of the oil inlet valve.

2. The press-fit positioning and correction device for an oil inlet valve according to claim 1, characterized in that: The elastic guide pin (2) comprises an elastic element (21), a guide pin (22) and a housing (23); the housing (23) is installed in the positioning base (1), with one end extending out of the positioning base (1); the elastic element (21) and the guide pin (22) are connected and installed together in the housing (23); one end of the guide pin (22) extends out of the housing (23); the end face of the housing (23) extending from the guide pin (22) abuts against the end face of the oil inlet valve.

3. The press-fit positioning and correction device for an oil inlet valve according to claim 2, characterized in that: A cavity (11) is provided in the positioning base (1), and the housing (23) is installed in the cavity (11).

4. The press-fit positioning and correction device for an oil inlet valve according to claim 3, characterized in that: The cavity (11) comprises a first cylindrical cavity portion (111) and a second cylindrical cavity portion (112) whose axes coincide with each other, the first cylindrical cavity portion (111) being away from the oil inlet valve and having a diameter larger than that of the second cylindrical cavity portion (112), and an annular protrusion (231) being provided at one end of the housing (23) away from the oil inlet valve, the annular protrusion (231) being located in the first cylindrical cavity portion (111).

5. The press-fit positioning and correction device for an oil inlet valve according to claim 4, characterized in that: The annular protrusion (231) and the first cylindrical cavity portion (111) form a moving pair, and the portion of the housing (23) other than the annular protrusion (231) and the second cylindrical cavity portion (112) form a moving pair.

6. A press-fit positioning and correction device for an oil inlet valve according to claim 4 or 5, characterized in that: The thickness of the annular protrusion (231) is smaller than the height of the first cylindrical cavity (11); and the housing (23) is fixedly connected to the guide pin (22).

7. The press-fit positioning and correction device for an oil inlet valve according to claim 4, characterized in that: One end of the elastic element (21) is connected to the guide pin (22), and the other end is fixedly connected to the surface of the first cylindrical cavity away from the guide pin (22).

8. The press-fit positioning and correction device for an oil inlet valve according to claim 2, characterized in that: The elastic element (21) is a compression spring.

9. The press-fit positioning and correction device for an oil inlet valve according to claim 1, characterized in that: The positioning base (1) is a cube with a cylindrical protrusion on its surface; the elastic guide pin (2) extends from the protrusion.

10. The press-fit positioning and correction device for an oil inlet valve according to claim 9, characterized in that: The raised edge is provided with rounded corners.

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