Connecting block and driving device

Abstract

The utility model discloses a connecting block and a driving device, and relates to the technical field of fuel pumps, the connecting block comprises a fuel delivery pump and a cam shaft, a connecting hole and connecting ports symmetrically arranged on two sides of the connecting hole are arranged on a connecting block body, the connecting block body is arranged in the fuel delivery pump, and a driving shaft of the fuel delivery pump is matched with the connecting hole. And a connecting piece matched with the connecting port is arranged on the cam shaft. Compared with traditional flat key or spline connection, the cam shaft and the oil delivery pump are convenient to assemble and disassemble through the connecting block body. The contact area of the connecting piece and the connecting port is larger, local stress is dispersed, and the abrasion and fracture risks of the connecting piece can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of fuel pump technology, and in particular to a connecting block and a driving device. Background Technology

[0002] Faced with increasingly stringent emission regulations and severe energy challenges, the adoption of high-pressure common rail fuel injection systems has become one of the main development trends in diesel engine technology worldwide. As a crucial component of the fuel system, the high-pressure common rail fuel pump is being used more and more widely, and the fuel delivery pump is an essential part of it.

[0003] However, during the operation of the high-pressure common rail fuel pump, a coaxiality error will occur between the camshaft and the fuel pump shaft. If the camshaft experiences large, irregular axial or longitudinal movement, it will cause the fuel pump to operate unstably or even damage the fuel pump.

[0004] In the existing technology, the common connection methods between the oil pump and the camshaft are spline or key connections. Spline connections are complex to process, require a certain amount of installation space, are inconvenient to install and disassemble, and are subject to greater stress, which can easily lead to spline wear or breakage; key connections are simple to process, but are also inconvenient to disassemble. Utility Model Content

[0005] The purpose of this invention is to provide a connecting block that has a low risk of wear and breakage.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a connecting block, comprising a connecting block body, wherein a connecting hole is opened in the center and connecting openings are evenly opened on the outer side.

[0007] Furthermore, there are two connection ports.

[0008] Furthermore, the cross-sections of both the connecting holes and the connecting openings are polygonal.

[0009] Furthermore, the cross-sections of both the connecting hole and the connecting opening are triangular.

[0010] Furthermore, both the connecting hole and the connecting opening have rectangular cross-sections.

[0011] Another objective of this invention is to provide a driving device that is easy to install and disassemble.

[0012] To achieve the above objectives, the present invention adopts the following technical solution: a driving device, including the connecting block described above, and also including an oil pump and a camshaft, wherein the drive shaft of the oil pump is matched with the connecting hole, and the oil pump is provided with a receiving groove for accommodating the body of the connecting block, and the output end of the camshaft is provided with a connector that matches the connecting port.

[0013] The technical principle of this utility model is as follows: The connecting block body is simple to process, requiring no complex keyway or spline machining. The camshaft and the oil pump are directly connected through the connecting port and connecting hole on the connecting block body, eliminating the need for keyway disassembly tools and significantly reducing installation difficulty. Furthermore, compared to traditional flat key or spline connections, the contact area between the connecting part and the connecting port is larger, dispersing local stress and reducing the risk of wear and breakage of the connecting part.

[0014] Furthermore, there is a gap between the connector and the sidewall of the connector.

[0015] Furthermore, the gap ranges from 0.05mm to 0.1mm.

[0016] Furthermore, the camshaft has an oil chamber, an oil inlet hole communicating with the oil chamber, and an oil outlet hole communicating with the outside. Damping plugs and sealing balls are press-fitted at both ends of the oil chamber, and damping holes are opened on the damping plugs.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. Compared with traditional flat key or spline connection, the connecting block body is simple to process. The connecting block body directly fits with the connecting port connector, without the need for keyway disassembly tools, making installation and disassembly convenient.

[0019] 2. The larger contact area between the connector and the connection port disperses local stress, reducing the risk of wear and breakage of the connector;

[0020] 3. Through the design of the clearance, it can absorb coaxiality error and axial / radial movement, thereby preventing the oil pump drive shaft from moving up and down with the camshaft, and thus avoiding damage caused by uneven force on the oil pump drive shaft;

[0021] 4. With the oil chamber, oil inlet and oil outlet, the oil circulates under pressure, effectively reducing the temperature of the camshaft and extending its life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0023] Figure 2 This is a front view of the connecting block body of this utility model;

[0024] Figure 3 This is a cross-sectional view of the present invention;

[0025] Figure 4 This is a cross-sectional view of the camshaft of this utility model;

[0026] Figure 5 This is a schematic diagram of the damping plug of this utility model.

[0027] In the above attached figures:

[0028] 1. Camshaft; 101. Connecting part; 102. Oil chamber; 103. Oil inlet; 104. Oil outlet;

[0029] 2. Sealed ball;

[0030] 3. Damping plug; 301. Damping orifice;

[0031] 4. Connecting block body; 401. Connecting hole; 402. Connecting port;

[0032] 5. Oil pump; 501. Drive shaft; 502. Receiving tank. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments; the structures described in various embodiments can be freely combined without conflict in terms of structure or principle.

[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0035] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] The following description, in conjunction with the accompanying drawings, describes some embodiments of the present invention:

[0037] like Figures 1-3As shown, this utility model proposes a connecting block, including a connecting block body 4, which has a connecting hole 401 in the center and connecting ports 402 evenly distributed on the outer side, with a total of 2 connecting ports.

[0038] To ensure the strength of the connecting block body 4, the area of ​​the connecting hole 401 accounts for 13% to 14% of the overall radial cross-sectional area of ​​the connecting block body 4, and the total area of ​​the connecting openings 402 accounts for 15% to 16% of the overall radial cross-sectional area of ​​the connecting block body 4. The number of connecting openings 402 can be 2, 3, or 4, etc. To reduce processing difficulty and ensure the strength of the connecting block body 4, 2 connecting openings 402 are preferred. Compared to traditional flat key or spline connections, the connecting block body 4 is simpler to process, requiring no complex keyway or spline machining. The direct engagement between the connecting openings 402 and the connecting piece 101 eliminates the need for keyway disassembly tools, significantly reducing installation difficulty.

[0039] Furthermore, the cross-sections of both the connecting hole 401 and the connecting port 402 are polygonal.

[0040] The connecting hole 401 and the connecting opening 402 can be other shapes besides circles, such as triangles, rectangles, etc. To facilitate processing and installation and reduce the risk of wear and breakage of the connector 101, a rectangle is preferred here.

[0041] This utility model also provides a driving device, including the connecting block described above, and also includes an oil pump 5 and a camshaft 1. The drive shaft 501 of the oil pump 5 matches the connecting hole 401, and the oil pump 5 is provided with a receiving groove 502 for accommodating the connecting block body 4. The output end of the camshaft 1 is provided with a connector 101 that matches the connecting port 402.

[0042] Compared to traditional keyed or splined connections, the camshaft 1 and the oil pump 5 are directly connected via the connection port 402 and connection hole 401 on the connecting block body 4. No keyway disassembly tools are required; disassembly only requires separating the connector 101 and the connecting block body 4, making installation and disassembly convenient and maintenance efficient. The larger contact area between the connector 101 and the connection port 402 disperses localized stress, reducing the risk of wear and breakage of the connector 101.

[0043] Furthermore, there is a gap between the connector 101 and the sidewall of the connector 402, and the gap ranges from 0.05mm to 0.1mm.

[0044] The clearance design absorbs coaxiality errors and axial / radial movement, preventing the drive shaft of the oil pump 5 from moving up and down with the camshaft 1, thus avoiding damage caused by uneven force on the drive shaft of the oil pump 5. After the camshaft 1 rotates a certain angle, the connecting piece 101 abuts against the side wall of the connecting port 402 of the connecting block body 4, eliminating the clearance. Through the connecting block body 4 and the drive shaft 501, torque is transmitted to the oil pump 5, thereby driving the oil pump 5 assembly. The clearance between the connecting block body and the connecting piece 101 varies depending on the size of the connecting block body. It can be proportionally increased or decreased to ensure that the clearance range is not greater than 0.1mm or not less than 0.05mm.

[0045] The clearance design can absorb coaxiality errors and axial / radial movement, thereby preventing the transmission shaft of the oil pump 5 from moving up and down with the camshaft 1, and thus avoiding damage caused by uneven force on the transmission shaft of the oil pump 5.

[0046] Furthermore, the camshaft 1 has an oil cavity 102, an oil inlet 103 communicating with the oil cavity 102, and an oil outlet 104 communicating with the outside. The two ends of the oil cavity 102 are respectively press-fitted with a damping plug 3 and a sealing ball 2, and the damping plug 3 has a damping hole 301.

[0047] There are four oil outlet holes 104, which are evenly distributed circumferentially on the outer wall of the camshaft 1. Through the setting of oil chamber 102, oil inlet hole 103, oil outlet hole 104 and damping hole 301, the oil circulates under pressure, effectively reducing the friction temperature at the connection between the camshaft 1 and the connecting block body 4, and extending the service life of the components.

Claims

1. A connecting block, characterized by: The connecting block body (4) is provided with a connecting hole (401) in the center and connecting ports (402) uniformly arranged on the outer side.

2. A connecting block according to claim 1, wherein The number of the connecting ports (402) is two.

3. A connecting block according to claim 1 or 2, characterised in that The cross sections of the connecting hole (401) and the connecting ports (402) are polygonal.

4. A connecting block according to claim 3, wherein The cross sections of the connecting hole (401) and the connecting ports (402) are triangular.

5. A connecting block according to claim 3, wherein The cross sections of the connecting hole (401) and the connecting ports (402) are rectangular.

6. A drive device characterized by comprising: The connecting block body (4) is provided with a connecting hole (401) in the center and connecting ports (402) uniformly arranged on the outer side.

7. A drive device according to claim 6, characterized in that The connecting ports (402) are matched with the connecting piece (101) of the camshaft (1).

8. A drive device according to claim 7, characterized in that The connecting piece (101) is matched with the connecting ports (402).

9. A drive arrangement according to any one of claims 6 to 8, wherein, The gap between the connecting piece (101) and the side wall of the connecting ports (402) is 0.05-0.1 mm. The camshaft (1) is provided with an oil cavity (102), an oil inlet hole (103) communicating with the oil cavity (102) and an oil outlet hole (104) communicating the oil cavity (102) with the outside. The two ends of the oil cavity (102) are respectively press-fitted with a damping plug (3) and a sealing ball (2). The damping plug (3) is provided with a damping hole (301).

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