Oil return device of cylinder cover oil injector

Abstract

The utility model discloses a cylinder cover oil sprayer oil return device which comprises a cylinder cover, an oil return channel is arranged in the cylinder cover, an oil sprayer is installed on the cylinder cover, one end of the oil return channel is communicated with the oil sprayer, the other end of the oil return channel is connected with an oil return pipe side wall through an oil return connector, the oil return channel is communicated with an oil return pipe, and the oil return pipe is located outside the cylinder cover. The problems that in the prior art, an oil return channel arranged in an air cylinder cover is difficult to machine, and the two ends of the oil return channel are not easy to center during machining are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heavy-duty diesel engine equipment and relates to an oil return device for a cylinder cover injector. Background Art

[0002] During the operation of the diesel engine, the fuel injector needs to return oil to avoid fuel waste and maintain the stable pressure of the fuel injector. The return oil channel on the cylinder head is an indispensable structure for the fuel return of the fuel injector. In order to achieve the unified collection of the return oil of the fuel injector, the return oil channel of the fuel injector needs to penetrate the mounting holes of all fuel injectors. The fuel flows into the cylinder head connection hole through the position where the fuel injector mounting hole and the return oil channel penetrate. The return oil channel of the cylinder head recovers the fuel to the fuel tank. The current heavy-duty diesel engine cylinder head fuel injector connection hole has the following problems:

[0003] 1. Heavy-duty diesel engines have a multi-cylinder structure. Generally, the cylinder head is relatively long. The oil return channel needs to run through the length of the cylinder head. The processing length of the oil return channel of the cylinder head is relatively long, which leads to problems such as high processing difficulty, complex processing technology and high processing cost.

[0004] 2. The processing length of the oil return channel is long. In the actual processing process, it is necessary to drill holes from both ends of the cylinder head to connect multiple injectors. There may be problems such as misalignment of the holes at both ends, reduced oil return cross-sectional area, and poor oil return.

[0005] 3. After the oil return channel is drilled through, one end of the connecting hole needs to be sealed with a bowl-shaped plug to ensure the sealing of the oil return channel and realize the oil return function. The hole for assembling the bowl-shaped plug requires special processing. The oil return channel is first drilled through and then sealed. The processing cost is high, the sealing cost is high, and there is also the risk of fuel leakage.

[0006] 4. The end of the cylinder head oil return that is not blocked with a bowl-shaped plug needs to be equipped with a special oil return joint so that the oil in the oil return channel can be returned to the oil tank. A special quick-insert oil return joint is required, and the structural cost is high. Utility Model Content

[0007] The utility model aims to provide a cylinder head fuel injector oil return device, which solves the problems in the prior art that the oil return channel arranged in the cylinder head is difficult to process and the two ends of the oil return channel are not easy to align during processing.

[0008] The technical solution adopted by the utility model is a cylinder head injector oil return device, including an oil return channel provided in the cylinder head, an injector installed on the cylinder head, one end of the oil return channel is connected with the injector, the other end of the oil return channel is connected with the side wall of the oil return pipe through an oil return joint, the oil return channel is connected with the oil return pipe, and the oil return pipe is located outside the cylinder head.

[0009] The utility model is also characterized in that:

[0010] The cylinder head is provided with a mounting hole, and the mounting hole cooperates with the fuel injector.

[0011] The cylinder head is connected to an intake manifold, and the intake manifold is located between the cylinder head and the oil return pipe.

[0012] A gasket is provided between the intake manifold and the cylinder head.

[0013] The intake manifold is provided with a connecting hole near the cylinder head, and the connecting hole cooperates with the oil return joint.

[0014] The number of fuel injectors shall not be less than two and the fuel injectors shall be arranged at equal intervals.

[0015] The beneficial effects of the utility model are as follows: the oil return pipe in the oil return device of the cylinder head injector in the utility model is arranged outside the cylinder head, and the oil return channel is changed from the length direction of the cylinder head to the width direction of the cylinder head, thereby reducing the processing difficulty and processing cost of the oil return channel; avoiding the problems of misalignment of the processing holes at both ends, reduced oil return cross-sectional area, and poor oil return.

[0016] The oil return channel is arranged on the intake side of the cylinder head, and there is no need to drill through the entire long side of the cylinder head, thus avoiding the need for blocking with a bowl-shaped plug, reducing the complexity of the connecting hole structure, and reducing the processing and assembly costs;

[0017] The oil return joint is connected to the cylinder head and the oil return pipe. While playing the role of oil return, it also plays the role of fixing the intake manifold to the cylinder head, improving the utilization rate of the cylinder head space structure, reducing the number of intake manifold fixing bolts, and increasing the sealing pressure of the intake manifold.

[0018] A sealing gasket is provided between the intake manifold and the cylinder head, which improves the sealing between the intake manifold and the cylinder head and improves the working efficiency of the injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of the oil return device of the cylinder head injector.

[0020] In the figure, 1. injector, 2. oil return channel, 3. sealing gasket, 4. cylinder head, 5. oil return joint, 6. oil return pipe, 7. intake manifold, 8. connecting hole, 9. mounting hole. DETAILED DESCRIPTION

[0021] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The cylinder head fuel injector oil return device of the utility model is as follows Figure 1As shown, it includes a cylinder head 4, a return oil channel 2 is provided in the cylinder head 4, an injector 1 is installed on the cylinder head 4, one end of the return oil channel 2 is connected to the injector 1, and the other end of the return oil channel 2 is connected to the side wall of the return oil pipe 6 through the return oil joint 5, the return oil channel 2 is connected to the return oil pipe 6, and the return oil pipe 6 is located outside the cylinder head 4.

[0023] The cylinder head 4 is provided with a mounting hole 9 , and the mounting hole 9 cooperates with the fuel injector 1 .

[0024] The cylinder head 4 is connected to an intake manifold 7 , and the intake manifold 7 is located between the cylinder head 4 and the oil return pipe 6 .

[0025] A sealing gasket 3 is provided between the intake manifold 7 and the cylinder head 4 .

[0026] The intake manifold 7 is provided with a connecting hole 8 near the cylinder head 4 , and the connecting hole 8 cooperates with the oil return joint 5 .

[0027] The number of the fuel injectors 1 is not less than two and the fuel injectors 1 are arranged at equal intervals.

[0028] Among them, the cylinder head 4 is fitted with the injector 1; the return oil pipe 6 is arranged outside the cylinder head 4, and the return oil pipe 6 is not restricted by the shape of the cylinder head 4, which reduces the process difficulty and avoids the situation of poor oil return during oil return; the number of injectors 1 is generally not less than 1, and the number of injectors 1 is equal to the number of return oil channels 2 and return oil joints, and each injector 1 is connected to the return oil pipe 6 through the return oil channel 2; the more the number of injectors 1 in the device of the utility model, the better the effect of the return oil pipe; the return oil channel 2 is arranged close to the intake manifold 7, and the return oil joint 5 is arranged between the return oil channel 2 and the intake manifold 7, and the return oil joint 5 stabilizes the connection between the intake manifold 7 and the cylinder head 4, and plays the role of fixing the bolt; the setting of the sealing gasket 3 increases the airtightness between the intake manifold 7 and the cylinder head 4, which is beneficial to improving the working efficiency of the injector; the injectors 1 are arranged at equal intervals, which is convenient for the oil to flow at a uniform speed in the return oil pipe 6 during oil return.

[0029] The working principle is: high-pressure diesel is sprayed into the cylinder hole by the injector 1, and the excess fuel flows into the return oil channel 2 in the cylinder head 4. The oil in the return oil channel 2 flows to the return oil pipe 6 through the return oil joint 5 for recovery, and the intake manifold 7 provides air assistance for the combustion of the fuel sprayed from the injector 1.

[0030] Example 1

[0031] The utility model discloses a cylinder head fuel injector oil return device, comprising a cylinder head 4, wherein an oil return passage 2 is arranged inside the cylinder head 4, an fuel injector 1 is mounted on the cylinder head 4, one end of the oil return passage 2 is connected with the fuel injector 1, and the other end of the oil return passage 2 is connected with a side wall of an oil return pipe 6 through an oil return joint 5, the oil return passage 2 is connected with the oil return pipe 6, and the oil return pipe 6 is located outside the cylinder head 4.

[0032] Example 2

[0033] The utility model discloses a cylinder head fuel injector oil return device, comprising a cylinder head 4, wherein an oil return passage 2 is arranged inside the cylinder head 4, an fuel injector 1 is mounted on the cylinder head 4, one end of the oil return passage 2 is connected with the fuel injector 1, and the other end of the oil return passage 2 is connected with a side wall of an oil return pipe 6 through an oil return joint 5, the oil return passage 2 is connected with the oil return pipe 6, and the oil return pipe 6 is located outside the cylinder head 4.

[0034] The cylinder head 4 is provided with a mounting hole 9 , which cooperates with the fuel injector 1 ; the cylinder head 4 is connected with an intake manifold 7 , which is located between the cylinder head 4 and the oil return pipe 6 .

[0035] Example 3

[0036] The utility model discloses a cylinder head fuel injector oil return device, comprising a cylinder head 4, wherein an oil return passage 2 is arranged inside the cylinder head 4, an fuel injector 1 is mounted on the cylinder head 4, one end of the oil return passage 2 is connected with the fuel injector 1, and the other end of the oil return passage 2 is connected with a side wall of an oil return pipe 6 through an oil return joint 5, the oil return passage 2 is connected with the oil return pipe 6, and the oil return pipe 6 is located outside the cylinder head 4.

[0037] The cylinder head 4 is connected to an intake manifold 7, which is located between the cylinder head 4 and the oil return pipe 6; a sealing gasket 3 is provided between the intake manifold 7 and the cylinder head 4; a connecting hole 8 is opened in the intake manifold 7 near the cylinder head 4, and the connecting hole 8 cooperates with the oil return joint 5; the number of the injectors 1 is not less than two and the injectors 1 are arranged at equal intervals.

Claims

1. The oil return device of the cylinder head injector is characterized by: The invention comprises a cylinder head (4), wherein an oil return passage (2) is provided in the cylinder head (4), an oil injector (1) is mounted on the cylinder head (4), one end of the oil return passage (2) is connected to the oil injector (1), the other end of the oil return passage (2) is connected to the side wall of an oil return pipe (6) via an oil return joint (5), the oil return passage (2) is connected to the oil return pipe (6), and the oil return pipe (6) is located outside the cylinder head (4).

2. The cylinder head injector oil return device according to claim 1, characterized in that: The cylinder head (4) is provided with a mounting hole (9), and the mounting hole (9) cooperates with the fuel injector (1).

3. The cylinder head injector oil return device according to claim 2, characterized in that: The cylinder head (4) is connected to an intake manifold (7), and the intake manifold (7) is located between the cylinder head (4) and the oil return pipe (6).

4. The cylinder head injector oil return device according to claim 3, characterized in that: A sealing gasket (3) is provided between the intake manifold (7) and the cylinder head (4).

5. The cylinder head injector oil return device according to claim 4, characterized in that: The intake manifold (7) is provided with a connection hole (8) near the cylinder head (4), and the connection hole (8) cooperates with the oil return joint (5).

6. The cylinder head injector oil return device according to claim 5, characterized in that: The number of the fuel injectors (1) is no less than two and the fuel injectors (1) are arranged at equal intervals.

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