Cylinder cover combustion chamber structure of outboard engine

Abstract

The embodiment of the utility model provides a cylinder cover combustion chamber structure of an outboard engine. The cylinder cover combustion chamber structure of the outboard engine comprises a cylinder cover, a fuel injector and a spark plug, the cylinder cover is mounted on an engine cylinder body of the outboard engine and is provided with a combustion chamber communicated with an inner cavity of the engine cylinder body, the fuel injection end of the fuel injector is communicated to the combustion chamber, and the ignition end of the spark plug extends into the combustion chamber; the engine cylinder body is provided with an exhaust port, and the center line of the fuel injector deviates in the direction away from the exhaust port relative to the center line of the combustion chamber. The caliber of the combustion chamber opening is gradually reduced in the direction close to the exhaust port; the inner wall of the combustion chamber extends in the direction close to the exhaust port from the fuel injector in the linear flow guide mode, when the piston moves in the direction away from the combustion chamber, combustion waste gas can flow to the exhaust port more smoothly along the inner wall of the combustion chamber and is exhausted through the exhaust port, and therefore carbon deposition is effectively reduced, and the working efficiency of the engine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of outboard engine engines, and particularly relates to a cylinder head combustion chamber structure of an outboard engine. Background Art

[0002] The multi-fuel engines of traditional two-stroke outboard motors mostly adopt the air injection method for fuel supply. Since the fuels used in multi-fuel engines are mostly diesel or kerosene, the diesel or kerosene molecules are larger and more difficult to atomize. And the engine fuel injectors of existing outboard motors are generally centrally arranged at the center of the cylinder head combustion chamber (as shown in Figure 1 ), resulting in poor exhaust of combustion waste gas, easy carbon deposition on the inner wall of the combustion chamber and the top of the piston, and affecting the combustion efficiency. Summary of the Utility Model

[0003] In view of this, the embodiments of the utility model provide a cylinder head combustion chamber structure of an outboard engine to solve the technical problems of poor exhaust of combustion waste gas and easy carbon deposition of the engine of the air injection outboard engine.

[0004] A cylinder head combustion chamber structure of an outboard engine provided by an embodiment of the utility model includes:

[0005] A cylinder head, which is installed on the engine cylinder block of the outboard engine and is provided with a combustion chamber communicated with the inner cavity of the engine cylinder block;

[0006] A fuel injector, which is installed on the cylinder head, and the fuel injection end of the fuel injector is communicated with the combustion chamber;

[0007] A spark plug, which is installed on the cylinder head, and the ignition end of the spark plug extends into the combustion chamber;

[0008] The engine cylinder block is provided with an exhaust port, and the center line of the fuel injector deviates from the center line of the combustion chamber in a direction away from the exhaust port; one side of the combustion chamber facing the engine cylinder block is provided with an opening, and the diameter of the opening gradually decreases in a direction close to the exhaust port; the inner wall of the combustion chamber extends linearly in a guiding shape from the fuel injector in a direction close to the exhaust port.

[0009] Optionally, an air squeezing area communicated with the combustion chamber and the inner cavity of the engine cylinder block is formed along the circumferential direction of the outer edge of the opening.

[0010] Optionally, mounting holes for installing the fuel injector and the spark plug are opened on the cylinder head, the mounting holes are communicated with the combustion chamber, and the fuel injector and the spark plug are respectively assembled in the corresponding mounting holes.

[0011] Optionally, a sealing ring is provided between the fuel injector and the cylinder head.

[0012] Optionally, a plurality of the combustion chambers are arranged at intervals along the length direction of the cylinder head, and each combustion chamber is correspondingly provided with the fuel injector and the spark plug.

[0013] Optionally, an air rail and a fuel common rail extending along the length direction are installed on the cylinder head. The intake end of each fuel injector is connected with an air-fuel mixing seat, and the air passage of the air rail and the oil passage of the fuel common rail are both communicated with the air-fuel mixing seat.

[0014] The embodiment of the utility model has the following beneficial effects:

[0015] 1. The combustion chamber is designed to be offset, and the diameter of the opening of the combustion chamber gradually decreases in the direction close to the exhaust port of the engine cylinder block. The inner wall of the combustion chamber extends linearly from the fuel injector in the direction close to the exhaust port; when the piston moves away from the combustion chamber, the combustion exhaust gas can flow more smoothly along the inner wall of the combustion chamber to the exhaust port and be discharged through the exhaust port, thereby effectively reducing carbon deposition and improving the working efficiency of the engine.

[0016] 2. An air squeezing area is formed at the outer edge of the opening of the combustion chamber. When the piston moves towards the combustion chamber, the gas in the combustion chamber is squeezed and can diffuse along the air squeezing area to the periphery, thereby effectively blowing off the carbon deposition attached to the top surface of the piston. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the combustion chamber of the cylinder head of the existing outboard engine;

[0019] Figure 2 It is a schematic structural diagram of the embodiment of the present utility model;

[0020] Figure 3 It is for Figure 1 the A-A cross-sectional view in

[0021] Figure 4 It is for Figure 1 the B-B partial cross-sectional view of the cylinder head in

[0022] Figure 5 It is a schematic assembly structural diagram of the embodiment of the present utility model;

[0023] The numbers in the figure indicate:

[0024] 1. Cylinder head; 2. Fuel injector; 3. Spark plug; 4. Engine block; 5. Combustion chamber; 6. Injector mounting hole; 7. Piston; 8. Exhaust port; 9. Squish area; 10. Air rail; 11. Fuel common rail; 12. Fuel-air mixing seat; 13. Spark plug mounting hole. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] Please refer to Figures 2 - 5 As shown, the embodiment of the present invention provides a combustion chamber structure of a cylinder head of an outboard engine, including a cylinder head 1 and a fuel injector 2 and a spark plug 3 installed on the cylinder head 1. Among them, the cylinder head 1 is installed on the engine block 4 of the outboard engine and is provided with a combustion chamber 5 communicating with the inner cavity of the engine block 4. The fuel injection end of the fuel injector 2 communicates with the combustion chamber 5 and can inject fuel into the combustion chamber 5. The ignition end of the spark plug 3 extends into the combustion chamber 5 to ignite the fuel injected into the combustion chamber 5. Specifically, the cylinder head 1 is provided with an injector mounting hole 6 for installing the fuel injector 2 and a spark plug mounting hole 13 for installing the spark plug 3. The injector mounting hole 6 and the spark plug mounting hole 13 are both communicated with the combustion chamber 5, and the fuel injector 2 and the spark plug 3 are respectively assembled in the corresponding mounting holes. A sealing ring is also provided between the fuel injector 2 and the cylinder head 1 to ensure the sealing between the two.

[0027] A piston 7 is provided in the engine block 4, and the piston 7 can reciprocate in a direction close to or away from the combustion chamber 5. An exhaust port 8 is provided on the engine block 4, and the center line of the fuel injector 2 deviates from the center line of the combustion chamber 5 in a direction away from the exhaust port 8. One side of the combustion chamber 5 facing the engine block 4 is provided with an opening, and the diameter of the opening gradually decreases in a direction close to the exhaust port 8, that is, the diameter of the end close to the fuel injector 2 is larger than the diameter of the end close to the exhaust port 8, and the inner wall of the combustion chamber 5 extends linearly from the fuel injector 2 in a direction close to the exhaust port 8. Therefore, when the piston 7 moves in a direction away from the combustion chamber 5, the combustion exhaust gas in the combustion chamber 5 can flow more smoothly along the inner wall of the combustion chamber 5 to the exhaust port 8 and be discharged through the exhaust port 8, thereby effectively reducing carbon deposition and improving the working efficiency of the engine.

[0028] Further, in the embodiment of the present utility model, an air squeezing area 9 is formed along the circumferential direction of the outer edge of the opening of the combustion chamber 5. The air squeezing area 9 is communicated with the inner cavity of the combustion chamber 5 and the engine cylinder block 4. When the piston 7 moves towards the combustion chamber 5, the gas in the combustion chamber 5 is squeezed and can diffuse along the air squeezing area 9 to the periphery, thereby effectively blowing off the carbon deposits adhering to the top surface of the piston 7.

[0029] As a specific implementation manner, in the embodiment of the present utility model, a plurality of combustion chambers 5 are arranged at intervals along the length direction of the cylinder head 1, and each combustion chamber 5 is correspondingly installed with a fuel injector 2 and a spark plug 3. A plurality of engine cylinder blocks 4 corresponding to the combustion chambers 5 one by one are arranged in the engine housing.

[0030] Further, an air rail 10 and a fuel common rail 11 extending along the length direction of the cylinder head 1 can be installed on the cylinder head 1. The intake end of each fuel injector 2 is connected with an air-fuel mixing seat 12, and the air passage of the air rail 10 and the oil passage of the fuel common rail 11 are both communicated to the air-fuel mixing seat 12 to provide fuel (air-entrained fuel) for a plurality of combustion chambers 5 simultaneously through the air rail 10 and the fuel common rail 11.

[0031] In this article, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present utility model; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The combustion chamber structure of the cylinder head of an outboard motor, characterized in that, Comprising: A cylinder head, which is mounted on the engine block of an outboard motor and is provided with a combustion chamber communicating with the inner cavity of the engine block; A fuel injector, which is mounted on the cylinder head, and the fuel injection end of the fuel injector communicates with the combustion chamber; A spark plug, which is mounted on the cylinder head, and the ignition end of the spark plug extends into the combustion chamber; The engine block is provided with an exhaust port, and the center line of the fuel injector deviates from the center line of the combustion chamber in a direction away from the exhaust port; an opening is provided on one side of the combustion chamber facing the engine block, and the diameter of the opening gradually decreases in a direction close to the exhaust port; the inner wall of the combustion chamber extends in a linear guiding shape from the fuel injector in a direction close to the exhaust port.

2. The combustion chamber structure of the cylinder head of an outboard motor according to claim 1, characterized in that: An air squeezing area communicating with the combustion chamber and the inner cavity of the engine block is formed along the circumference of the outer edge of the opening.

3. The combustion chamber structure of the cylinder head of an outboard motor according to claim 1, characterized in that: Mounting holes for mounting the fuel injector and the spark plug are formed on the cylinder head, the mounting holes communicate with the combustion chamber, and the fuel injector and the spark plug are respectively assembled in the corresponding mounting holes.

4. The combustion chamber structure of the cylinder head of an outboard motor according to claim 3, characterized in that: A sealing ring is provided between the fuel injector and the cylinder head.

5. A combustion chamber structure of a cylinder head of an outboard motor according to any one of claims 1-4, characterized in that: A plurality of the combustion chambers are arranged at intervals along the length direction of the cylinder head, and each combustion chamber is correspondingly provided with the fuel injector and the spark plug.

6. The combustion chamber structure of the cylinder head of an outboard motor according to claim 5, characterized in that: An air rail and a fuel common rail extending along the length direction are mounted on the cylinder head, the intake end of each fuel injector is connected with an air-fuel mixing seat, and the air passage of the air rail and the oil passage of the fuel common rail communicate with the air-fuel mixing seat.

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