Engine cylinder head cover

Abstract

The utility model discloses an engine cylinder head cover which comprises a cover shell, a blow-by gas inlet, a gas outlet and an oil return opening are formed in the cover shell, a separation cavity is formed between the blow-by gas inlet and the gas outlet, a fine separation module is arranged in the separation cavity, the fine separation module comprises a fine separation plate and fabric arranged on the fine separation plate, and the fabric is arranged on the fine separation plate. And a plurality of through holes are formed in the fine separation plate and are used for enabling the blow-by gas to pass through and collide with the surface of the fabric. The cylinder head cover is integrated with the fine separation module, so that the cylinder head cover has high oil-gas separation efficiency, is generally applied to crankshaft ventilation systems of gasoline engines and diesel engines and is used for separating engine oil and other impurities in blow-by gas of the engines, and the efficient oil-gas separation efficiency of the cylinder head cover can avoid the engine oil burning problem of the engines; and the PN value of the diesel engine open-type crank-on system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine accessories, in particular to an engine cylinder head cover. Background Art

[0002] When the engine is working, some exhaust gas will leak from the combustion chamber piston ring into the engine crankcase. These exhaust gases mix with the oil particles inside the engine to form crankcase blowby gas. If these blowby gases are directly discharged into the atmosphere, they will cause air pollution; if they directly enter the combustion chamber, due to the high oil content in the blowby gas, they will cause serious carbon deposition in the combustion chamber and reduce the engine power performance.

[0003] When a diesel engine with a closed crankcase system is working in winter, the crankcase outlet pipe is prone to ice formation. Ice particles falling on the high-speed rotating supercharger will cause the supercharger to be scrapped. In order to solve this problem, diesel engine manufacturers tend to adopt an open crankcase ventilation system. This choice will bring a new problem: engine blowby directly discharged into the atmosphere will cause the engine PN and PM to exceed the emission standards. Therefore, it is necessary to integrate a high separation efficiency oil-gas separation module inside the cylinder head cover, but the existing engine cylinder head cover uses a single labyrinth-structured impact separation plate, resulting in poor oil-gas separation effect on blowby. Utility Model Content

[0004] The utility model aims to provide an engine cylinder head cover, which solves the problem that the existing engine cylinder head cover has poor oil-gas separation effect on blowby gas.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] An engine cylinder head cover comprises a cover shell, the cover shell is provided with a blow-by gas inlet, an outlet and an oil return port, and a separation chamber is formed between the blow-by gas inlet and the outlet, a fine separation module is provided in the separation chamber, the fine separation module comprises a fine separation plate and a fabric arranged on the fine separation plate, and a plurality of through holes are opened on the fine separation plate for allowing the blow-by gas to pass through and impact on the fabric surface.

[0007] A further improvement is that the fine separation plate adopts a U-shaped structure consisting of a first vertical plate, a first horizontal plate, and a second vertical plate, the fabric is located above the first horizontal plate, and an oil hole is opened on the first horizontal plate.

[0008] A further improvement is that the through holes are opened on the first vertical plate, and the first vertical plate is provided with guide ribs on its air outlet side and between adjacent through holes.

[0009] A further improvement is that the height of the guide rib along the blowby gas flow direction is at least 0.2 mm.

[0010] A further improvement is that the first vertical plate is provided with a second horizontal plate on its air inlet side.

[0011] A further improvement is that the fabric is installed above the first horizontal plate through a clamping plate, and a limiting plate for limiting the fabric is provided on the cover shell, and a gap is left between the limiting plate and the clamping plate.

[0012] A further improvement is that an inner air outlet tube is provided at the air outlet, and an air inlet end of the inner air outlet tube protrudes from the inner wall of the separation chamber.

[0013] A further improvement is that the air inlet end of the air outlet inner pipe protrudes from the inner wall of the separation chamber by at least 5 mm.

[0014] A further improvement is that an oil return one-way valve is provided at the oil return port.

[0015] The beneficial effect of the utility model is that the cylinder head cover is integrated with a fine separation module, which has a very high oil-gas separation efficiency. It is generally used in the crankshaft ventilation system of gasoline engines and diesel engines to separate engine oil and other impurities in the engine blowby gas. The high oil-gas separation efficiency of the cylinder head cover can avoid the problem of engine oil burning and improve the PN value of the diesel engine open crankshaft system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the external contour structure of the engine cylinder head cover;

[0017] Figure 2 A cutaway diagram of a cross-sectional structure of a cylinder head cover of an engine;

[0018] Figure 3 and Figure 4 Schematic diagram of the structure of the fine separation plate at different viewing angles;

[0019] Figure 5 Schematic diagram of separation of blowby gas at the fine separation module;

[0020] In the figure: 1, cover shell; 11, limit plate; 2, separation chamber; 3, oil return one-way valve; 4, fine separation plate; 41, first vertical plate; 42, first horizontal plate; 43, second vertical plate structure; 44, oil hole; 45, guide rib; 46, second horizontal plate; 5, fabric; 6, through hole; 7, clamping plate; 8, air outlet inner pipe. DETAILED DESCRIPTION

[0021] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Combination Figure 1-5 As shown, an engine cylinder head cover includes a head cover housing 1, and a blow-by gas inlet (not shown, actually located at Figure 2 The uncut portion on the right side of the figure), the air outlet and the oil return port, and a separation chamber 2 is formed between the blow-by gas inlet and the air outlet, which are all prior arts. In the present utility model, a fine separation module is provided in the separation chamber 2. The fine separation module adopts a perforated plate impact fabric structure, which includes a fine separation plate 4 and a fabric 5 provided on the fine separation plate 4, and a plurality of through holes 6 are provided on the fine separation plate 4 to allow the blow-by gas to pass through and impact the surface of the fabric 5. When the engine cylinder head cover is working, the blow-by gas enters the separation chamber 2 through the blow-by gas inlet (not shown in the figure), and the blow-by gas is acted on by the fine separation module to filter the oil particles. The separated oil is refluxed through the oil return port, and the clean blow-by gas after separation is discharged from the air outlet.

[0023] In the present invention, the preferred fine separation plate 4 adopts a U-shaped structure composed of a first vertical plate 41, a first horizontal plate 42, and a second vertical plate 43. The fabric 5 is located above the first horizontal plate 42, and an oil hole 44 is provided on the first horizontal plate 42, so that the clean blowby gas after separation can be discharged along the Figure 5 The middle arrow indicates that the oil flows upward, and the separated oil settles downward through the oil hole 44 .

[0024] In the present invention, preferably, the through holes 6 are opened on the first vertical plate 41, and the first vertical plate 41 is provided with guide ribs 45 on its gas outlet side and between adjacent through holes 6. The guide ribs 45 make the blowby gas passing through the through holes 6 converge and hit the fabric 5, thereby improving the oil-gas separation efficiency. Preferably, the height of the guide ribs 45 along the blowby gas flow direction is at least 0.2 mm.

[0025] In the present invention, the first vertical plate 41 is preferably provided with a second horizontal plate 46 on its air intake side. The function of the second horizontal plate 46 is to reduce the oil in the fine separation front cavity from flowing into the fine separation rear cavity when the engine is in abnormal condition.

[0026] In the utility model, the preferred fabric 5 is installed above the first horizontal plate 42 through the clamping plate 7, and a limiting plate 11 for limiting the fabric 5 is provided on the cover shell 1, and a gap is left between the limiting plate 11 and the clamping plate 7. The function of the limiting plate 11 is to reduce the movement of the clamping plate 7 in the direction of airflow.

[0027] In the utility model, the preferred oil return port is provided with an oil return check valve 3, and the gas outlet is provided with an inner gas outlet tube 8, the gas inlet end of the inner gas outlet tube 8 protrudes from the inner wall of the separation chamber 2 (i.e. Figure 2 In order to prevent the separated oil from escaping directly from the exhaust inner pipe 8 when the engine is abnormal (tilting and shaking, etc.), the intake end of the exhaust inner pipe 8 preferably protrudes from the inner wall of the separation chamber 2 by at least 5 mm.

[0028] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. An engine cylinder head cover, comprising a head cover shell (1), wherein the head cover shell (1) is provided with a blow-by gas inlet, an outlet and an oil return port, and a separation chamber (2) is formed between the blow-by gas inlet and the outlet, characterized in that: A fine separation module is provided in the separation chamber (2), the fine separation module comprising a fine separation plate (4) and a fabric (5) provided on the fine separation plate (4), and the fine separation plate (4) is provided with a plurality of through holes (6) for allowing blow-by gas to pass through and impact the surface of the fabric (5).

2. The engine cylinder head cover according to claim 1, characterized in that: The fine separation plate (4) adopts a U-shaped structure composed of a first vertical plate (41), a first horizontal plate (42), and a second vertical plate (43); the fabric (5) is located above the first horizontal plate (42), and an oil hole (44) is provided on the first horizontal plate (42).

3. The engine cylinder head cover according to claim 2, characterized in that: The through holes (6) are formed on the first vertical plate (41), and the first vertical plate (41) is provided with flow guide ribs (45) on its air outlet side and between adjacent through holes (6).

4. The engine cylinder head cover according to claim 3, characterized in that: The height of the guide rib (45) along the blowby gas flow direction is at least 0.2 mm.

5. The engine cylinder head cover according to claim 2, characterized in that: The first vertical plate (41) is provided with a second horizontal plate (46) on the air inlet side thereof.

6. The engine cylinder head cover according to claim 2, characterized in that: The fabric (5) is mounted above the first transverse plate (42) via a clamping plate (7); a limiting plate (11) for limiting the fabric (5) is provided on the cover shell (1), and a gap is left between the limiting plate (11) and the clamping plate (7).

7. The engine cylinder head cover according to claim 1, characterized in that: An inner air outlet tube (8) is provided at the air outlet, and an air inlet end of the inner air outlet tube (8) protrudes from the inner wall of the separation chamber (2).

8. The engine cylinder head cover according to claim 7, characterized in that: The air inlet end of the air outlet inner tube (8) protrudes from the inner wall of the separation chamber (2) by at least 5 mm.

9. The engine cylinder head cover according to claim 1, characterized in that: An oil return one-way valve (3) is provided at the oil return port.

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