A cylinder head cover with oil and gas separation

Abstract

The utility model discloses a kind of oil-gas separation cylinder cover covers, to solve the problems such as oil-gas separation efficiency in prior art is difficult to adapt emission regulations, sealing performance is poor etc. The cylinder cover cover includes main body cover, pre-filtering cavity, respirator, multiple sealing assembly and auxiliary installation structure. Main body cover top installs respirator, integrated pre-filtering cavity, O-ring is arranged between cover plate and cavity to realize sealing, cavity inner wall and bottom are provided with fish pattern flow guide groove. Main body cover bottom edge is embedded cylinder cover cover sealing ring, inside is equipped with metal limiting rod, corresponding oil atomizer position is equipped with oil atomizer oil seal, small auxiliary hole position is adapted special oil seal, top is also provided with oil port cover assembly. Pre-filtering cavity guides oil-gas flow by flow guide groove and promotes oil drop condensation backflow, cooperates with respirator to form staged separation, multiple sealing structure accurately blocks leakage path. The utility model structure is simple, meet stringent emission requirements, sealing is reliable and convenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of engine parts, specifically to a cylinder head cover with an oil-gas separator. Background Technology

[0002] The cylinder head cover is a protective component of the engine, primarily used to cover the engine block and prevent external dust, moisture, and other impurities from entering the engine. It also seals the internal space of the cylinder block, maintaining the engine's normal operating environment. The oil separator, as part of the crankcase ventilation system, separates and recovers engine oil mixed in with crankcase blow-by gases. Its separation performance directly affects the engine's operational reliability and exhaust emission levels.

[0003] With the continuous upgrading of vehicle emission regulations, engine emission control has added evaporative emission requirements, and the residual oil and gas after separation by the oil-gas separator is also included in the overall engine emission assessment. Currently, in order to improve the separation effect, the industry mostly adopts solutions such as changing to a closed-loop system or replacing the oil-gas separator with one that has higher separation efficiency. However, such methods will significantly increase the engine manufacturing cost, making it difficult to widely apply them under the premise of cost control.

[0004] Meanwhile, in existing technologies, when a large amount of oil and gas simultaneously enters the oil-gas separator, the separator's processing load increases sharply, easily causing a significant drop in separation efficiency and failing to meet regulatory requirements. Furthermore, traditional cylinder head covers have shortcomings in their sealing structure design. The connection points between the cover and the cylinder block, as well as the assembly gaps with components such as fuel injectors, often experience oil and gas leaks due to poor sealing performance. These leaks not only cause oil consumption but also directly affect emission standards.

[0005] Therefore, improving oil-gas separation efficiency while controlling costs, and optimizing the sealing performance of the cylinder head cover to reduce oil-gas leakage, have become technical problems that need to be solved in the current engine parts industry. Utility Model Content

[0006] To address the aforementioned problems in the prior art, this utility model proposes a cylinder head cover with oil-gas separation, comprising a top cover, a pre-filter chamber, and a breather; the top cover is a convex shell shape; a pre-filter chamber with an upper opening is provided on one side of the top cover, and a pre-filter chamber cover plate is provided at the opening of the pre-filter chamber; a breather is installed on the top of the top cover, and the air inlet of the breather is connected to the air outlet of the pre-filter chamber through an internal channel of the top cover; an oil filler cap assembly is also provided on the top of the top cover.

[0007] Preferably, it also includes a multi-seal assembly, which includes a cylinder head cover seal ring embedded in the bottom edge of the top cover, an O-ring provided on the mating surface between the pre-filter chamber cover plate and the chamber body, an injector oil seal fitted to the corresponding mounting hole of the injector, and a mounting hole oil seal adapted to small auxiliary holes.

[0008] Preferably, it also includes a limiting rod that is vertically fixed to the inner sidewall of the top cover; the length of the limiting rod is adapted to the assembly depth of the top cover, and its end faces the limiting plane corresponding to the engine cylinder block.

[0009] Preferably, the inner wall and / or bottom of the pre-filter chamber are provided with fish-patterned guide grooves.

[0010] Preferably, the pre-filter chamber is provided with an oil and gas inlet and an outlet. The oil and gas inlet is connected to the oil and gas passage inside the engine. The fish-patterned guide groove extends in a continuous corrugated shape, with one end pointing to the oil and gas inlet and the other end pointing towards the oil collection area at the bottom of the chamber.

[0011] Preferably, the bottom edge of the top cover has an annular sealing groove along the circumferential direction, and the cylinder head cover sealing ring is tightly embedded in the annular sealing groove.

[0012] Preferably, the pre-filter chamber cover plate has an annular groove on the mating surface with the chamber opening, and the O-ring is embedded in the annular groove, so that the chamber is sealed by pressing the pre-filter chamber cover plate together.

[0013] Preferably, the injector oil seal is an annular elastic component, with its inner wall fitting against the outer wall of the injector, and its outer wall being embedded in the sealing groove of the corresponding mounting hole of the top cover.

[0014] Preferably, the breather has a built-in return channel, through which the separated engine oil flows back into the engine during operation, and the filtered gas is discharged through the exhaust end of the breather.

[0015] Preferably, the oil filler cap assembly covers the oil filling port on the top of the cover and has an internal sealing structure.

[0016] This utility model has the following beneficial effects:

[0017] (1) Improved oil-gas separation and recovery efficiency. This cylinder head cover with oil-gas separation integrates a pre-filter chamber and a breather to form a staged separation structure. The fish-patterned guide grooves in the pre-filter chamber effectively guide the flow direction of oil and gas and slow down the flow rate. Combined with the labyrinth-like flow channel design, it can promote the full condensation of oil droplets in the oil and gas. The condensed oil can flow back to the engine through the bottom structure of the chamber. The pre-filtered oil and gas then enter the breather for fine separation, which greatly reduces the processing load of the subsequent oil-gas separator. This design effectively reduces the amount of residual oil and gas after separation, which is compatible with the emission control requirements for evaporative emissions in emission regulations.

[0018] (2) Multiple sealing structures reduce the risk of oil and gas leakage. The device is equipped with multi-layered and targeted sealing components. The cylinder head cover sealing ring achieves the main seal between the cylinder head cover and the cylinder block, the O-ring ensures the sealing between the pre-filter chamber cover plate and the chamber, and the injector oil seal and special specification oil seal are adapted to the sealing requirements of the injector mounting position and small auxiliary hole positions, respectively. The multiple sealing structure covers the key parts where oil and gas are prone to leakage, reducing the phenomenon of oil and gas leakage.

[0019] (3) The structural design is stable and reliable. The metal limit rod can precisely limit the assembly stroke of the cylinder head cover, avoiding excessive compression that could damage the seals or deform the cylinder head cover. The anti-loosening bolts firmly lock the pre-filter chamber cover, effectively preventing the cover from loosening or falling off due to engine vibration. The assembly relationship and structural strength of each component have been optimized, resulting in strong overall stability and reduced manufacturing costs.

[0020] This utility model provides a cylinder head cover with oil-gas separation, which combines performance improvement with ease of use and maintenance, and has strong practical application value. Attached Figure Description

[0021] Figure 1 This is a top view of an embodiment of the present utility model;

[0022] Figure 2 This is an embodiment of the present utility model. Figure 1 AA section diagram;

[0023] Figure 3 This is an embodiment of the present utility model. Figure 1 BB cross-section diagram;

[0024] Figure 4 This is a bottom view of an embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached drawings: 1-Cylinder head cover seal ring; 2-Limit rod; 3-O-ring; 4-Mounting hole oil seal; 5-Injector oil seal; 6-Breaser; 7-Oil port cover assembly; 8-Anti-loosening bolt; 9-Top cover; 10-Pre-filter chamber cover plate; 11-Guide groove. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The cylinder head cover with oil-gas separator in this embodiment of the utility model, such as Figures 1-4As shown, it includes the basic load-bearing and overall sealing components, injectors and local sealing structures, pre-filter chambers and flow guiding structures, oil-gas separation and auxiliary functional components, etc., which are described in detail below:

[0028] (1) Foundation bearing and overall sealing assembly. The main component of this assembly is the top cover 9, which is in the shape of a shell and provides the installation foundation and frame support for all other components.

[0029] The bottom edge of the top cover 9 has an annular sealing groove along the circumference, and the cylinder head cover sealing ring 1 is tightly fitted into the sealing groove. When the top cover 9 is fastened to the engine block, the cylinder head cover sealing ring 1 is compressed and undergoes elastic deformation. The sealing force generated by the deformation achieves the main seal between the cylinder head cover and the cylinder block, which can not only prevent external dust, moisture and other impurities from entering the engine, but also prevent internal oil and gas from leaking out.

[0030] The anti-loosening bolt 8 is used to fix the cylinder cover to the engine. The tightness of the bolt connection ensures that the cylinder cover remains in a stable assembly state during engine operation, preventing positional displacement or loosening due to vibration or other factors, and ensuring the sealing and reliability of the overall structure.

[0031] A metal limiting rod 2 is vertically fixed on the inner wall of the top cover 9. The length of the metal limiting rod 2 is precisely matched with the assembly depth of the cylinder head cover, and its end faces the corresponding limiting plane of the cylinder block. During the assembly process, the metal limiting rod 2 can directly limit the downward stroke of the top cover 9, avoiding excessive compression damage to the seals or deformation of the top cover 9 itself due to excessive assembly force, thus ensuring assembly accuracy and component integrity.

[0032] (2) Injector and local sealing structure. The top cover 9 has a mounting hole that perfectly matches the outer diameter of the injector, corresponding to the installation position of the engine injector. The injector oil seal 5 is an annular elastic component with a diameter of 36mm. Its inner wall fits tightly against the outer wall of the injector, and its outer wall is firmly embedded in the sealing groove preset in the inner wall of the mounting hole, forming a dedicated sealing structure between the injector and the cylinder head cover, which specifically solves the problem of oil and gas leakage due to gaps in the injector installation area.

[0033] In addition, the top cover 9 has multiple small auxiliary mounting holes for mounting sensors, pipelines, and other auxiliary components. The mounting hole oil seal 4 has a diameter of 18mm and is fitted into these small holes. With its own elastic properties, it forms a tight fit with the hole wall and the outer wall of the component, achieving sealing protection for local minor gaps and further reducing the risk of oil and gas leakage.

[0034] (3) Pre-filter chamber and flow guiding structure. An independent pre-filter chamber is integrally formed on one side of the top cover 9. The chamber is a hollow structure with an opening at the top, which is specifically used for the preliminary separation of oil and gas. The chamber has a pre-set oil and gas inlet and outlet. The oil and gas inlet is connected to the oil and gas passage inside the engine, and the outlet is connected to the subsequent separation components.

[0035] The pre-filtration chamber cover 10 is a plate-shaped structure adapted to the shape and size of the chamber opening, and is directly fitted onto the chamber opening. The mating surface between the pre-filtration chamber cover 10 and the chamber opening has an annular groove, and the O-ring 3 is embedded in the groove. The chamber is sealed by the pressing action of the pre-filtration chamber cover 10, preventing oil and gas from escaping from the opening during the pre-filtration process.

[0036] The inner wall and bottom of the pre-filter chamber are integrally formed with fish-patterned guide grooves 11. These guide grooves extend in a continuous corrugated shape, with one end pointing towards the oil and gas inlet of the chamber and the other end towards the oil collection area at the bottom of the chamber. The guide grooves not only accurately guide the flow direction of the oil and gas entering the chamber, but also slow down the flow rate of the oil and gas through the corrugated structure, providing sufficient time and conditions for the full condensation of oil droplets in the oil and gas. The condensed oil can converge along the guide grooves to the oil collection area and then flow back into the engine.

[0037] (4) Oil-gas separation and auxiliary function components. The breather 6 is installed on the top of the top cover 9, and its air inlet is connected to the air outlet of the pre-filter chamber through a pre-set channel inside the top cover 9. The oil and gas after preliminary separation by the pre-filter chamber can directly enter the breather 6 through this channel, where the breather 6 performs further fine separation. The oil produced after separation will flow back to the engine for reuse through the built-in return channel of the breather 6, while the filtered gas will be discharged through the exhaust end of the breather 6.

[0038] The top of the top cover 9 also has a dedicated oil filler port, which is covered by the oil filler cap assembly 7. The oil filler cap assembly 7 has an integrated sealing structure inside, which can reliably seal the filler port, making it convenient for daily oil filling and level checking operations, and preventing oil and gas leakage and impurity intrusion at the filler port.

[0039] The components of the cylinder head cover with oil-gas separation in this embodiment of the invention are precisely assembled to form an integrated structure that combines sealing protection and oil-gas pre-separation functions.

[0040] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A cylinder head cover with an oil-gas separator, characterized in that, It includes a top cover (9), a pre-filter chamber and a respirator (6); the top cover (9) is a convex shell shape; a pre-filter chamber with an upper opening is provided on one side of the top cover (9), and a pre-filter chamber cover plate (10) is provided at the opening of the pre-filter chamber; a respirator (6) is installed on the top of the top cover (9), and the air inlet of the respirator (6) is connected to the air outlet of the pre-filter chamber through the internal channel of the top cover (9); an oil port cover assembly (7) is also provided on the top of the top cover (9).

2. The cylinder head cover with oil-gas separator according to claim 1, characterized in that, It also includes a multi-seal assembly, which includes a cylinder head cover seal (1) embedded in the bottom edge of the top cover (9), an O-ring (3) provided on the mating surface between the pre-filter chamber cover plate (10) and the chamber, an injector oil seal (5) fitted to the corresponding mounting hole of the injector, and a mounting hole oil seal (4) adapted to a small auxiliary hole.

3. The cylinder head cover with oil-gas separator according to claim 1, characterized in that, It also includes a limiting rod (2) that is vertically fixed to the inner wall of the top cover (9); the length of the limiting rod (2) is adapted to the assembly depth of the top cover (9), and its end faces the limiting plane corresponding to the engine cylinder block.

4. The cylinder head cover with oil-gas separator according to claim 1, characterized in that, The pre-filter chamber has fish-patterned guide grooves (11) on its inner wall and / or bottom.

5. The cylinder head cover with oil-gas separator according to claim 4, characterized in that, The pre-filter chamber is provided with an oil and gas inlet and an outlet. The oil and gas inlet is connected to the oil and gas passage inside the engine. The fish-patterned guide groove (11) extends in a continuous corrugated shape, with one end pointing to the oil and gas inlet and the other end pointing towards the oil collection area at the bottom of the chamber.

6. The cylinder head cover with oil-gas separator according to claim 2, characterized in that, The bottom edge of the top cover (9) is provided with an annular sealing groove along the circumferential direction, and the cylinder head cover sealing ring (1) is tightly embedded in the annular sealing groove.

7. The cylinder head cover with oil-gas separator according to claim 2, characterized in that, The pre-filter chamber cover plate (10) has an annular groove on the mating surface with the chamber opening, and the O-ring (3) is embedded in the annular groove. The chamber is sealed by pressing the pre-filter chamber cover plate (10).

8. The cylinder head cover with oil-gas separator according to claim 2, characterized in that, The injector oil seal (5) is an annular elastic component, with its inner wall fitting against the outer wall of the injector and its outer wall embedded in the sealing groove of the corresponding assembly hole of the top cover (9).

9. The cylinder head cover with oil-gas separator according to claim 1, characterized in that, The breather (6) has a built-in return channel. During operation, the separated engine oil flows back to the engine through the return channel, and the filtered gas is discharged through the exhaust end of the breather (6).

10. The cylinder head cover with oil-gas separator according to claim 1, characterized in that, The oil filler cap assembly (7) covers the oil filling port on the top of the top cover (9) and has an internal sealing structure.

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