A lubrication system for a two-stroke multi-fuel outboard motor

Abstract

The utility model discloses a kind of lubricating systems for two-stroke multi-fuel outboard engine, including the air inlet cylinder connected to the crankcase each air inlet end, the inside of each air inlet cylinder is equipped with the accelerating tube that is communicated with the air inlet of air inlet end, accelerating tube is equipped with reduced diameter section, including the oil pump corresponding to all air inlet cylinder one by one, the oil outlet of each oil pump is communicated with corresponding reduced diameter section and combustion chamber respectively by three-way pipe;Including the flow control valve of the pipe section connected between oil pump and reduced diameter section.The utility model can different fuel, flow control valve adjusts the oil supply of oil, i.e. Adjust the proportion of fuel and oil, change the existing oil fixed oil supply mode, adjust the oil supply proportion of oil according to fuel type, improve the effect of saving oil.

Description

Technical Field

[0001] This utility model belongs to the field of outboard motor technology, specifically, it relates to a lubrication system for a two-stroke multi-fuel outboard motor. Background Technology

[0002] An outboard motor is a complete marine propulsion device that integrates power, transmission, and propulsion systems, suspended outside the hull (side of the boat). It is typically installed at the stern of small vessels. Outboard motors are divided into two-stroke and four-stroke types. Two-stroke outboard motors have advantages such as high speed, high power output, compact mechanism, and light weight. Since boats using outboard motors often have specific speed requirements, two-stroke gasoline outboard motors are the most common. Furthermore, outboard motors are also divided into single-fuel and multi-fuel types. Single-fuel motors can only use one specific type of fuel, while multi-fuel motors can use multiple different types of fuel.

[0003] The shortcomings of existing two-stroke multifuel outboard motors are as follows: regardless of the fuel used, as long as the engine's operating principle and the lubrication requirements of moving parts remain unchanged, a set oil ratio is used to ensure good lubrication. However, in reality, the optimal ratio of different fuels to oil varies. Existing two-stroke multifuel outboard motors uniformly distribute oil according to a fixed ratio, resulting in high oil consumption. It is impossible to reduce oil consumption by changing the oil ratio, thus failing to achieve the goal of saving oil. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a lubrication system for a two-stroke multi-fuel outboard engine, including an intake cylinder connected to each intake end of the crankcase, an acceleration pipe connected to the intake port of each intake end, the acceleration pipe having a reduced diameter section, an oil pump corresponding to each intake cylinder, and the oil outlet of each oil pump being connected to the corresponding reduced diameter section and combustion chamber via a tee pipe; and a flow control valve connecting the pipe section between the oil pump and the reduced diameter section.

[0005] The preferred embodiment of this utility model is as follows: three intake cylinders are connected to form a single unit, and the intake chamber of each intake cylinder is independent. The bottom of each intake chamber is connected to the crankcase via a return pipe, and each return pipe, the pipe between each oil pump and the accelerator pipe, and the pipe between each oil pump and the combustion chamber are equipped with a one-way valve. Undispersed engine oil in the accelerator pipe drips down to the bottom of the intake chamber. This portion of engine oil is then atomized again by the negative pressure in the crankcase along the return pipe, thus lubricating the engine.

[0006] The beneficial effects of the lubrication system for a two-stroke multi-fuel outboard motor in this invention are as follows: 1. The oil pump divides the engine oil in the oil tank into two supply lines. One supply line leads to the combustion chamber, and the other leads to the intake manifold. Air enters the intake manifold and then the intake manifold. Due to the narrowing section in the intake manifold, according to Bernoulli's principle, the airflow is accelerated at the narrowing section. This acceleration disperses the dripping oil, achieving an atomization effect. Compared to existing direct oil supply methods, the atomized oil provides better lubrication, thus reducing oil consumption and saving fuel.

[0007] 2. For different fuels, the flow control valve adjusts the oil supply, that is, it adjusts the ratio of fuel to oil, changes the existing fixed oil supply method, and adjusts the oil supply ratio according to the fuel type to further improve the oil saving effect. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the lubrication system for a two-stroke multi-fuel outboard motor in this invention. Figure 2 for Figure 1 A three-dimensional image; Figure 3 for Figure 2 A diagram showing the hidden air intake.

[0010] Reference numerals in the attached diagram: 1. Crankcase; 2. Intake cylinder; 3. Intake chamber; 4. Accelerator pipe; 5. Oil pump; 6. T-pipe; 7. Return pipe; 8. Flow control valve; 9. Reduced diameter section. Detailed Implementation

[0011] In view of the shortcomings of the prior art, the inventor of this utility model has, through long-term research and extensive practice, proposed the technical solution of this utility model. The following will further explain and illustrate the technical solution, its implementation process, and its principles in conjunction with the accompanying drawings and specific implementation examples.

[0012] like Figure 1As shown, this embodiment provides a lubrication system for a two-stroke multi-fuel outboard engine, including an intake cylinder 2 connected to each intake end of the crankcase 1. The three intake cylinders 2 are connected as a single unit and fixedly connected to the intake end, and the intake chamber 3 of each intake cylinder 2 is independent. This embodiment takes three combustion chambers (i.e., three piston chambers) as an example. Each intake cylinder 2 has an acceleration pipe 4 inside that communicates with the intake port of the intake end. The acceleration pipe 4 has a reduced diameter section 9. The two ends of the acceleration pipe 4 are funnel-shaped, and the diameter of the middle part is the smallest, forming the reduced diameter section 9. The airflow velocity increases sharply after passing through the reduced diameter section 9. Oil droplets falling into the reduced diameter section 9 will be blown away by the high-speed airflow, playing a role in atomization.

[0013] like Figure 2 and Figure 3 As shown, this embodiment also includes an oil pump 5 connected to the outside of the intake cylinder 2. Each intake cylinder 2 corresponds to one oil pump 5. The oil outlet of each oil pump 5 is connected to the oil inlet of the corresponding reduced diameter section 9 and the oil inlet of the combustion chamber through a three-way pipe 6. Each oil pump 5 is equipped with a one-way valve (not shown in the figure) in the pipe between the reduced diameter section 9 of the acceleration pipe 4 and the pipe between each oil pump 5 and the combustion chamber. The oil can only flow in the direction of the reduced diameter section 9 and the combustion chamber.

[0014] In this embodiment, the intake cylinder 2 is equipped with a suitable bottom cover, which is not shown in the figure. The bottom cover is connected to the intake pipe. Some of the oil dripping onto the reduced diameter section 9 is not blown away and drips along the acceleration pipe 4 to the bottom of the intake chamber 3. In order to utilize this oil, in this embodiment, the bottom of each intake chamber 3 is connected to the crankcase 1 through a return pipe 7, and the return pipe 7 is also equipped with a one-way valve. Figures 1 to 3 The location of the return pipe 7 in the intake cylinder 2 does not represent its actual position. Here, "bottom" refers to the lowest point on the side wall after the outboard motor is installed, not a specific side wall. The bottom position is determined based on actual usage. More precisely, the return pipe 7 should be located inside the intake chamber 3 where the oil collects. Oil can only enter the crankcase 1 from the intake chamber 3. The crankcase 1 has negative pressure, which is used to spray the oil from the bottom into the crankcase 1 to lubricate the connecting rods and crankshaft.

[0015] like Figure 1 As shown, this embodiment also includes a flow control valve 8, which is installed in the pipe section between the oil pump 5 and the reduced-bore section 9. The flow control valve 8 is electrically connected to the outboard motor's ECU, and the ECU adjusts the valve core opening of the flow control valve 8. For different fuels, the ECU causes the flow control valve 8 to open to the corresponding degree to adjust the oil supply. This embodiment changes the existing fixed oil supply method, adjusting the oil supply ratio according to the fuel type, and simultaneously using the acceleration pipe 4 to atomize the oil. By saving oil consumption from both the oil supply method and oil quantity control, it achieves the goal of fuel saving.

[0016] It should be understood that the above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. It should not be considered that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A lubrication system for a two-stroke multi-fuel outboard motor, characterized in that: This includes an intake manifold connected to each intake end of the crankcase, and each intake manifold has an acceleration pipe inside that communicates with the intake port of the intake end. The acceleration pipe has a reduced diameter section. This includes oil pumps that correspond one-to-one with each intake manifold, with the oil outlet of each oil pump connected to the corresponding reduced-diameter section and combustion chamber via a three-way pipe. This includes a flow control valve for the pipe section connecting the oil pump and the reduced-bore section.

2. The lubrication system for a two-stroke multi-fuel outboard motor according to claim 1, characterized in that: The flow control valve is electrically connected to the outboard motor's ECU.

3. The lubrication system for a two-stroke multi-fuel outboard motor according to claim 1, characterized in that: The three air intakes are connected to form a single unit, and each air intake has an independent air intake chamber.

4. A lubrication system for a two-stroke multi-fuel outboard motor according to claim 3, characterized in that: Each intake chamber is connected to the crankcase via a return pipe.

5. A lubrication system for a two-stroke multi-fuel outboard motor according to claim 4, characterized in that: Each return pipe, each pipe between the oil pump and the acceleration pipe, and each pipe between the oil pump and the combustion chamber are equipped with a one-way valve.

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