Engine crankcase oil-gas separation system with oil return one-way valve

Abstract

The engine crankcase oil-gas separation system with the oil return one-way valve comprises the one-way valve arranged on the upper portion of a crankcase, the axis of the one-way valve is arranged in the vertical direction, the upper end of an oil return pipe is communicated with the lower portion of an oil-gas separator, and the lower end of the oil return pipe is communicated with the one-way valve. The one-way valve comprises an oil inlet connector, an oil return connector and a plastic ball valve, the oil inlet connector is in threaded connection with the oil return connector, and the plastic ball valve is arranged in a cavity formed by the oil inlet connector and the oil return connector in a vertically movable mode. The one-way valve is arranged on the oil return pipe to prevent gas in the crankcase from pushing back backflow engine oil, so that a pipe opening of the oil return pipe can be arranged above the crankcase, a pipeline is shortened, the arrangement difficulty is reduced, and the problem that the oil return pipe is iced and blocked in an extremely cold environment is solved.

Description

Technical Field

[0001] This utility model belongs to the field of engine technology, specifically an engine crankcase oil-gas separation system with a return oil check valve. Background Technology

[0002] During engine combustion, high-temperature combustion gases from the combustion chamber enter the engine crankcase through the piston ring openings and the side clearance between the piston rings and the cylinder wall. These exhaust gases need to be expelled from the crankcase promptly; otherwise, increased crankcase pressure can damage seals such as oil seals, leading to oil leaks. The exhaust gases contain unburned fuel, engine oil, and water vapor, which must be thoroughly separated by an oil-gas separator before being released into the engine intake system. Otherwise, they will contaminate the intake system, particularly the turbocharger impeller, resulting in reduced turbocharger efficiency, insufficient engine power, or increased fuel consumption and emissions.

[0003] Common crankcase ventilation systems separate engine oil from the exhaust gases in the engine crankcase and return it to the oil pan via a return line. To prevent the oil from being forced back by the exhaust gas pressure in the crankcase during its return flow, the return line opening is generally required to be below the oil level in the oil pan. However, this results in a longer return line, making it difficult to install and affecting the overall appearance of the engine. Furthermore, in extremely cold environments, an excessively long return line can cause water vapor in the engine oil to condense and freeze during its return flow, clogging the return line. Utility Model Content

[0004] This utility model provides an engine crankcase oil-gas separation system with a return oil check valve. A check valve is arranged on the return oil pipe to prevent crankcase gas from pushing back the backflowing oil. This allows the return oil pipe opening to be arranged above the crankcase, shortening the pipeline, reducing the difficulty of arrangement, and solving the problem of ice blockage in the return oil pipe under extremely cold conditions.

[0005] This utility model discloses an engine crankcase oil-gas separation system with a return oil check valve, used for the return oil line of the oil-gas separator in the engine crankcase ventilation system. Its features include, from top to bottom, a cylinder head cover, a cylinder head, a crankcase, and an oil pan, and further include an oil-gas separator, a cylinder head cover outlet pipe, a crankshaft ventilation box pipe, an engine intake pipe, and a return oil pipe; one end of the oil-gas separator is connected to the engine intake pipe via the crankshaft ventilation box pipe, and the other end is connected to the cylinder head cover via the cylinder head cover outlet pipe.

[0006] It also includes a one-way valve located on the upper part of the crankcase. The axis of the one-way valve is set vertically. This utility model uses a one-way valve, which can set the oil return pipe above the crankcase. This avoids the defect of the prior art where the oil return pipe port is required to be arranged below the oil level in the oil pan, resulting in an excessively long oil return pipe. The oil return pipe is greatly shortened, the oil return pipe arrangement is simple, and the blockage of the oil return pipe in winter is avoided.

[0007] The upper end of the return oil pipe connects to the lower part of the oil-gas separator, and the lower end of the return oil pipe connects to the one-way valve. The one-way valve includes an oil inlet connector, an oil return connector, and a plastic ball valve. The oil inlet connector and the oil return connector are threaded together, and the plastic ball valve is movably disposed within the cavity formed by the oil inlet connector and the oil return connector. This utility model uses a plastic ball valve, which is lightweight and requires very little upward thrust. The crankcase exhaust gas can easily overcome the weight of the ball valve to achieve the closure of the one-way valve. This avoids the disadvantage of using a steel ball valve in the prior art, where the crankcase exhaust gas pressure is insufficient to push the ball valve upward due to excessive weight, requiring the addition of a spring to achieve the upward movement of the ball valve. This utility model has a simple structure and low cost.

[0008] When the oil in the return pipe accumulates to a certain weight above the plastic ball valve, the combined weight of the oil and the plastic ball valve exceeds the crankcase exhaust pressure, causing the plastic ball valve to open and the oil to flow back to the oil pan, thus achieving oil return.

[0009] Preferably, the present invention also includes an O-ring seal, which is disposed on the mating wall of the oil inlet connector and the oil return connector. The O-ring seal is pressed by the clamping force of the threaded connection between the oil inlet connector and the oil return connector to achieve a seal and prevent leakage of backflowing oil.

[0010] Preferably, after the plastic ball valve moves upward, its upper surface and the lower part of the oil inlet connector seal together to ensure a sealing effect, and the ball valve can block the exhaust gas; after the plastic ball valve moves downward, its lower surface and the upper part of the oil return connector leave an oil return gap, ensuring that the ball valve moves downward, opens the oil return channel, and the oil flows back to the oil pan, ensuring that the ball valve can move up and down in the cavity, and controlling the opening and closing of the oil return channel by moving up and down.

[0011] Specifically, in this utility model, the outer wall of the oil return connector is provided with threads, the upper part of the oil inlet connector is provided with a bellows connector, the upper part of the oil return connector is constructed as a countersunk hole, the countersunk hole is provided with internal threads, and the lower part of the oil inlet connector is constructed as an external thread structure that mates with the countersunk hole.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. Install a one-way valve to prevent crankcase gas from pushing back the backflowing engine oil, so that the oil return pipe can be placed above the crankcase, shortening the pipeline, reducing the difficulty of installation, and solving the problems of difficult installation caused by the long engine crankcase ventilation oil return pipeline and easy freezing and blockage in extremely cold environments.

[0014] 2. The one-way valve uses a plastic ball valve, which has low weight and can be lifted by crankcase exhaust gas to achieve one-way valve closure. The spring structure is eliminated, resulting in a simple structure and low cost.

[0015] 3. By controlling the opening and closing of the oil return channel through the balance relationship between crankcase pressure, ball valve, and oil gravity, the problem of poor oil return caused by the oil return pipe being located above the crankcase is effectively solved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an engine crankcase oil-gas separation system with a return oil check valve, as described in this utility model.

[0017] Figure 2 This is a schematic diagram of the one-way valve described in this utility model.

[0018] Figure 3 This is a cross-sectional view of the one-way valve described in this utility model.

[0019] In the diagram: 1-One-way valve, 101-Inlet connector, 102-Return connector, 103-Plastic ball valve, 104-O-ring seal, 2-Cylinder head, 3-Crankcase, 4-Oil pan, 5-Oil-gas separator, 6-Cylinder head cover exhaust pipe, 7-Crankshaft ventilation box pipe, 8-Engine intake pipe, 9-Return pipe, 10-Cylinder head cover. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0021] In the description of this utility model, it should be understood that the terms "left", "right", "up", "down", "front", "back", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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 structure 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.

[0022] Example 1:

[0023] like Figures 1-3As shown, an engine crankcase oil-gas separation system with a return oil check valve includes, from top to bottom, a cylinder head cover 10, a cylinder head 2, a crankcase 3, and an oil pan 4, and further includes an oil-gas separator 5, a cylinder head cover exhaust pipe 6, a crankshaft ventilation box pipe 7, an engine intake pipe 8, and an oil return pipe 9; one end of the oil-gas separator 5 is connected to the engine intake pipe 8 via the crankshaft ventilation box pipe 7, and the other end is connected to the cylinder head cover 10 via the cylinder head cover exhaust pipe 6; it also includes components disposed on the... The crankcase 3 has a one-way valve 1 on its upper part, with the axis of the one-way valve 1 set vertically. The upper end of the oil return pipe 9 is connected to the lower part of the oil-gas separator 5, and the lower end of the oil return pipe 9 is connected to the one-way valve 1. The one-way valve 1 includes an oil inlet connector 101, an oil return connector 102, and a plastic ball valve 103. The oil inlet connector 101 and the oil return connector 102 are threaded together, and the plastic ball valve 103 is movable up and down in the cavity formed by the oil inlet connector 101 and the oil return connector 102.

[0024] In this embodiment, as Figure 3 As shown, when the engine is running, the exhaust gas pressure in the crankcase 3 overcomes the weight of the plastic ball valve 103, lifting it up. The plastic ball valve 103 and the lower part of the oil inlet connector 101 then seal against the exhaust gas, preventing it from affecting the oil return flow in the oil separator 5. When the returned oil accumulates above the plastic ball valve 103 to a certain weight, and the combined weight of the oil and the plastic ball valve 103 exceeds the exhaust gas pressure in the crankcase 3, the plastic ball valve 103 opens, and the oil flows back to the oil pan 4 through the gap.

[0025] Example 2:

[0026] like Figures 1-3 As shown, an engine crankcase oil-gas separation system with a return oil check valve is used for the oil-gas separator 5 return oil pipe 9 of the engine crankcase 3 ventilation system. It includes a cylinder head cover 10, a cylinder head 2, a crankcase 3 and an oil pan 4 arranged sequentially from top to bottom, and also includes an oil-gas separator 5, a cylinder head cover exhaust pipe 6, a crankshaft ventilation box pipe 7, an engine intake pipe 8 and an oil return pipe 9; one end of the oil-gas separator 5 is connected to the engine intake pipe 8 through the crankshaft ventilation box pipe 7 and the other end is connected to the cylinder head cover 10 through the cylinder head cover exhaust pipe 6;

[0027] This embodiment also includes a one-way valve 1 disposed on the upper part of the crankcase 3, the axis of the one-way valve 1 being arranged vertically. Specifically, the one-way valve 1 is disposed on the upper left part of the engine, that is, the uppermost left end of the crankcase 3, and the oil-gas separator 5 is also disposed on the upper left end of the engine. The oil return pipe 9 and the oil-gas separator 5 are placed very close to each other, shortening the length of the oil return pipe 9 and reducing the difficulty of layout.

[0028] In this embodiment, the upper end of the return oil pipe 9 is connected to the lower part of the oil-gas separator 5, and the lower end of the return oil pipe 9 is connected to the one-way valve 1; the one-way valve 1 includes an oil inlet connector 101, an oil return connector 102 and a plastic ball valve 103, the oil inlet connector 101 and the oil return connector 102 are threadedly connected, and the plastic ball valve 103 is movably disposed in the cavity formed by the oil inlet connector 101 and the oil return connector 102.

[0029] like Figure 3 As shown, this embodiment includes an O-ring seal 104, which is disposed on the mating wall of the oil inlet connector and the oil return connector 102. The O-ring seal 104 is pressed by the clamping force of the threaded connection between the oil inlet connector 101 and the oil return connector 102 to achieve sealing and prevent leakage of backflowing oil.

[0030] like Figure 3 As shown, in this embodiment, after the plastic ball valve 103 moves upward, its upper surface and the lower part of the oil inlet connector 101 seal together to achieve a seal and ensure the sealing effect, and the ball valve can block the exhaust gas; after the plastic ball valve 103 moves downward, its lower surface and the upper part of the oil return connector 102 leave an oil return gap, which ensures that when the ball valve moves downward, it opens the oil return channel and the oil flows back to the oil pan 4, ensuring that the ball valve can move up and down in the cavity, and the opening and closing of the oil return channel is controlled by the up and down movement.

[0031] like Figure 3 As shown in this embodiment, the outer wall of the oil return connector 102 is provided with threads, the upper part of the oil inlet connector 101 is provided with a bellows connector, the upper part of the oil return connector 102 is constructed as a countersunk hole, the countersunk hole is provided with internal threads, and the lower part of the oil inlet connector 101 is constructed as an external thread structure that mates with the countersunk hole.

Claims

1. An engine crankcase oil-gas separation system with a return oil check valve, characterized in that... The system includes, from top to bottom, a cylinder head cover (10), a cylinder head (2), a crankcase (3), and an oil pan (4), as well as an oil-gas separator (5), a cylinder head cover exhaust pipe (6), a crankshaft ventilation box pipe (7), an engine intake pipe (8), and an oil return pipe (9). One end of the oil-gas separator (5) is connected to the engine intake pipe (8) through the crankshaft ventilation box pipe (7), and the other end is connected to the cylinder head cover (10) through the cylinder head cover exhaust pipe (6). It also includes a one-way valve (1) located on the upper part of the crankcase (3). The axis of the one-way valve (1) is set vertically. The upper end of the return oil pipe (9) is connected to the lower part of the oil-gas separator (5), and the lower end of the return oil pipe (9) is connected to the one-way valve (1). The one-way valve (1) includes an oil inlet connector (101), an oil return connector (102), and a plastic ball valve (103). The oil inlet connector (101) and the oil return connector (102) are threaded together. The plastic ball valve (103) can be moved up and down in the cavity formed by the oil inlet connector (101) and the oil return connector (102).

2. The engine crankcase oil-gas separation system with a return oil check valve according to claim 1, characterized in that: It also includes an O-ring (104), which is disposed on the mating wall surface of the oil inlet connector and the oil return connector (102).

3. The engine crankcase oil-gas separation system with a return oil check valve according to claim 1, characterized in that: After the plastic ball valve (103) moves upward, its upper surface and the lower part of the oil inlet connector (101) are sealed together to achieve a seal. After the plastic ball valve (103) moves downward, its lower surface and the upper part of the oil return connector (102) are left with an oil return gap.

4. The engine crankcase oil-gas separation system with a return oil check valve according to claim 1, characterized in that: The return oil connector (102) has threads on its outer wall, and the inlet oil connector (101) has a bellows connector on its upper part.

5. An engine crankcase oil-gas separation system with a return oil check valve according to claim 1, characterized in that: The upper part of the oil return connector (102) is a countersunk hole with an internal thread, and the lower part of the oil inlet connector (101) is an external thread structure that mates with the countersunk hole.

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