A sealing structure of a VVA control gas path on a cylinder head cover

Abstract

The utility model discloses a kind of sealing structure of VVA control gas path on cylinder cover, it is related to engine gas path sealing technology, including high-pressure gas pipe joint, three-way hinged joint and oil passing bolt;Joint mounting position is equipped on cylinder cover, high-pressure gas pipe joint is fixedly installed on joint mounting position by pressing plate, and first axial sealing structure is equipped between high-pressure gas pipe joint and joint mounting position;Three-way hinged joint is arranged below joint mounting position, the first joint of three-way hinged joint is arranged in high-pressure gas pipe joint and extends to cylinder cover, and the part of three-way hinged joint inserted in high-pressure gas pipe joint is equipped with radial sealing structure;Three-way hinged joint is installed on drive cylinder by oil passing bolt, and second axial sealing structure is equipped between oil passing bolt and three-way hinged joint.The utility model greatly improves the reliability of control gas path sealing, reduces the risk that sealing is unreliable in junction, avoids the problem that external oil mist enters into control gas path.

Description

Technical Field

[0001] This utility model relates to engine air passage sealing technology, and more specifically, it relates to a sealing structure for the VVA control air passage on a cylinder head cover. Background Technology

[0002] The VVA (Variable Valve Actuation) control air passage sealing structure on the cylinder head cover is a key component of the engine's variable valve timing (VVT) or variable valve lift (VVL) system, directly affecting the accuracy of valve adjustment, system reliability, and overall engine performance. This structure primarily ensures the sealing of the air pressure control passage, preventing gas leakage. Therefore, the reliability of this sealing structure directly impacts the overall engine performance. Existing control air passages mainly consist of the cylinder head cover and the air passages opened in the driving cylinders. Their sealing structure relies primarily on sealing rings located between the end faces of the components, achieving a seal through installation pressure. However, this sealing method requires high installation precision between components. If installation deviations occur, the local pressure of the sealing ring will be lower, making this location more prone to reduced sealing performance, leading to air leakage or oil mist intrusion. Utility Model Content

[0003] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a sealing structure for the VVA control air circuit on the cylinder head cover, which greatly improves the reliability of the control air circuit sealing.

[0004] The present invention discloses a sealing structure for a VVA control air circuit on a cylinder head cover, comprising a high-pressure air pipe connector, a three-way hinged connector, and an oil passage bolt. The cylinder head cover has a connector mounting position, and the high-pressure air pipe connector is fixedly mounted on the connector mounting position by a pressure plate, with a first axial sealing structure between the high-pressure air pipe connector and the connector mounting position. The three-way hinged connector is located below the connector mounting position, and has a first connector that passes through the cylinder head cover and extends into the high-pressure air pipe connector. The portion of the three-way hinged connector inserted into the high-pressure air pipe connector has a radial sealing structure. The three-way hinged connector is mounted on the drive cylinder by the oil passage bolt, and the remaining connectors of the three-way hinged connector are connected to the air circuit of the drive cylinder. A second axial sealing structure is provided between the oil passage bolt and the three-way hinged connector.

[0005] Preferably, the first axial sealing structure includes a first O-ring and a first sealing groove formed in the joint mounting position, the first O-ring being located in the first sealing groove, and the lug of the high-pressure air pipe joint being pressed against the top of the first O-ring.

[0006] Preferably, the radial sealing structure includes two second O-rings and two second sealing grooves formed on the first joint of the tee joint, with the two second O-rings corresponding to each other in the two second sealing grooves.

[0007] Preferably, the distance between the second sealing groove near the first joint of the three-way hinged joint and the end of the first joint is greater than or equal to 1.5 mm.

[0008] Preferably, the second axial sealing structure includes two third O-rings. A third sealing groove is formed between one side of the tee joint and the head of the oil-passing bolt, and between the other side of the tee joint and the drive cylinder. The two third O-rings are installed in the two third sealing grooves in a one-to-one correspondence.

[0009] Preferably, the pressure plate is a semi-open pressure plate with an opening angle of 90°, and the high-pressure air pipe connector is fixed to the cylinder head cover by locking bolts screwed onto the cylinder head cover.

[0010] Beneficial effects

[0011] The advantages of this utility model are:

[0012] 1. A three-layer sealing structure is adopted, which greatly improves the reliability of the control air circuit seal. Furthermore, this sealing structure incorporates both axial and radial seals. The combination of these two sealing methods ensures the sealing reliability of the connections between components, reduces the risk of unreliable sealing at the connections, and prevents external oil mist from entering the control air circuit.

[0013] 2. The first connector of the tee hinge joint is inserted into the high-pressure air pipe connector. This not only provides a certain installation margin when the components are connected, but also further improves the sealing performance between the high-pressure air pipe connector and the tee hinge joint through the complementary relationship between the two sealing rings. This avoids the problem of low sealing reliability and easy leakage caused by simply pressing the sealing ring at the end face at the connection between the components. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the cylinder head cover of this utility model;

[0015] Figure 2 This is a partial cross-sectional structural diagram of the cylinder head cover with a sealing structure according to the present invention.

[0016] Figure 3 for Figure 2 Enlarged schematic diagram of the structure within the dashed box;

[0017] Figure 4This is a schematic diagram of the exploded structure of the sealing structure of this utility model.

[0018] Among them: 1-Cylinder head cover, 2-Drive cylinder, 3-Pressure plate, 4-High pressure air pipe connector, 5-T-joint, 6-Oil bolt, 7-First axial sealing structure, 8-Radial sealing structure, 9-Second axial sealing structure, 10-Locking bolt, 71-First sealing groove, 72-First O-ring seal, 81-Second sealing groove, 82-Second O-ring seal, 91-Third sealing groove, 92-Third O-ring seal. Detailed Implementation

[0019] The present invention will be further described below with reference to embodiments, but this does not constitute any limitation on the present invention. Any limited modifications made by any person within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0020] See Figures 1-4 This utility model discloses a sealing structure for the VVA control air circuit on a cylinder head cover, comprising a high-pressure air pipe connector 4, a three-way hinged connector 5, and an oil passage bolt 6. The cylinder head cover 1 has a connector mounting position. The high-pressure air pipe connector 4 is fixedly mounted on the connector mounting position by a pressure plate 3, and a first axial sealing structure 7 is provided between the high-pressure air pipe connector 4 and the connector mounting position, forming a first layer of sealing structure, mainly used to seal oil mist. The three-way hinged connector 5 is located below the connector mounting position. The three-way hinged connector 5 has a first connector that passes through the cylinder head cover 1 and extends into the high-pressure air pipe connector 4. The portion of the three-way hinged connector 5 inserted into the high-pressure air pipe connector 4 has a radial sealing structure 8, forming a second layer of sealing structure, mainly used to seal high-pressure air and oil mist. The three-way hinge joint 5 is installed on the drive cylinder 2 via the oil-passing bolt 6, and the other joints of the three-way hinge joint 5 are connected to the air passage of the drive cylinder 2. A second axial sealing structure 9 is provided between the oil-passing bolt 6 and the three-way hinge joint 5 to form a third sealing structure, which is mainly used to seal high-pressure air and oil mist.

[0021] This embodiment employs a three-layer sealing structure, significantly improving the reliability of the control air circuit seal. Furthermore, this sealing structure incorporates both axial and radial seals. The combination of these two sealing methods ensures reliable sealing at the connections between components, reducing the risk of unreliable seals and preventing external oil mist from entering the control air circuit. In addition, the first connector of the three-way hinged joint 5 is inserted into the high-pressure air pipe connector 4, further enhancing the sealing performance between the high-pressure air pipe connector 4 and the three-way hinged joint 5. This also avoids the problem of low sealing reliability and leakage issues that can easily occur at component connections where only the sealing ring at the end face is pressed, due to installation accuracy issues.

[0022] In this embodiment, the first axial sealing structure 7 includes a first O-ring 72 and a first sealing groove 71 formed in the connector mounting position. The first O-ring 72 is located in the first sealing groove 71, and the lug of the high-pressure air pipe connector 4 is pressed against the top of the first O-ring 72.

[0023] The second axial sealing structure 9 includes two third O-ring seals 92. A third sealing groove 91 is formed between one side of the three-way hinge joint 5 and the head of the oil-passing bolt 6, and between the other side of the three-way hinge joint 5 and the drive cylinder 2. The two third O-ring seals 92 are installed in the two third sealing grooves 91 in a one-to-one correspondence.

[0024] In the two axial sealing structures mentioned above, the sealing effect of the first sealing structure can be ensured by the sealing groove and the pressing method.

[0025] The radial sealing structure 8 includes two second O-ring seals 82 and two second sealing grooves 81 formed on the first joint of the tee hinge joint 5. The two second O-ring seals 82 are respectively provided in the two second sealing grooves 81. Since the radial sealing structure 8 is located between the high-pressure gas pipe joint 4 and the tee hinge joint 5, its long installation stroke, combined with the sealing of the seals, achieves a good sealing effect.

[0026] Furthermore, in the radial sealing structure 8, the distance between the second sealing groove 81 near the first connector in the tee hinge joint 5 and the end of the first connector is greater than or equal to 1.5 mm, which can effectively prevent the O-ring from slipping out of the air pipe joint and causing the seal to fail.

[0027] In this embodiment, the pressure plate 3 is a semi-open pressure plate with an opening angle of 90°, which increases the horizontal assembly angle of the high-pressure air pipe. The pressure plate 3 fixes the high-pressure air pipe connector 4 to the cylinder head cover 1 by the locking bolt 10 screwed onto the cylinder head cover 1.

[0028] In this embodiment, the inlet of the high-pressure air pipe connector 4 is designed with a 1.3×65° long chamfer to provide guidance for the hinged connector. In addition, it is necessary to control the distance between the top of the inner cavity of the high-pressure air pipe connector 4 and the top of the three-way hinged connector 5 to be ≥4mm to prevent tipping and increase the upward assembly space of the hinged connector.

[0029] 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 modifications and improvements can be made without departing from the structure of the present utility model. These modifications and improvements will not affect the effectiveness of the present utility model or the practicality of the patent.

Claims

1. A sealing structure for the VVA control air passage on a cylinder head cover, characterized in that, The system includes a high-pressure air pipe connector (4), a three-way hinged connector (5), and an oil-filled bolt (6); a connector mounting position is provided on the cylinder head cover (1), the high-pressure air pipe connector (4) is fixedly installed on the connector mounting position by a pressure plate (3), and a first axial sealing structure (7) is provided between the high-pressure air pipe connector (4) and the connector mounting position; the three-way hinged connector (5) is located below the connector mounting position, the three-way hinged connector (5) has a first connector that passes through the cylinder head cover (1) and extends into the high-pressure air pipe connector (4), and the part of the three-way hinged connector (5) inserted into the high-pressure air pipe connector (4) has a radial sealing structure (8); the three-way hinged connector (5) is installed on the drive cylinder (2) by the oil-filled bolt (6), and the remaining connectors of the three-way hinged connector (5) are connected to the air passage of the drive cylinder (2), and a second axial sealing structure (9) is provided between the oil-filled bolt (6) and the three-way hinged connector (5).

2. The sealing structure of the VVA control gas passage on the cylinder head cover according to claim 1, characterized in that, The first axial sealing structure (7) includes a first O-ring (72) and a first sealing groove (71) opened in the joint mounting position. The first O-ring (72) is located in the first sealing groove (71), and the lug of the high-pressure air pipe joint (4) is pressed against the top of the first O-ring (72).

3. The sealing structure of the VVA control air passage on the cylinder head cover according to claim 1, characterized in that, The radial sealing structure (8) includes two second O-rings (82) and two second sealing grooves (81) formed on the first joint of the tee hinge joint (5). The two second O-rings (82) are respectively provided in the two second sealing grooves (81).

4. The sealing structure of the VVA control air passage on the cylinder head cover according to claim 3, characterized in that, The distance between the second sealing groove (81) near the first connector of the three-way hinge joint (5) and the end of the first connector is greater than or equal to 1.5 mm.

5. The sealing structure of the VVA control air passage on the cylinder head cover according to claim 1, characterized in that, The second axial sealing structure (9) includes two third O-ring seals (92). A third sealing groove (91) is formed between one side of the three-way hinge joint (5) and the head of the oil bolt (6) and between the other side of the three-way hinge joint (5) and the drive cylinder (2). The two third O-ring seals (92) are installed in the two third sealing grooves (91) one by one.

6. The sealing structure of the VVA control air passage on the cylinder head cover according to claim 1, characterized in that, The pressure plate (3) is a semi-open pressure plate with an opening angle of 90°. The pressure plate (3) fixes the high-pressure air pipe connector (4) to the cylinder head cover (1) by means of locking bolts (10) screwed onto the cylinder head cover (1).

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