A sealing mounting structure of a stamping cylinder head cover

Abstract

The present application relates to the field of internal combustion engine, specifically relates to a kind of sealing installation structure of stamping cylinder cover, including cylinder cover, cylinder cover, the contact surface of cylinder cover and cylinder cover is equipped with profile seal ring, cylinder cover is equipped with multiple mounting holes, rocker arm fixed stud is arranged in mounting hole, one end of rocker arm fixed stud is connected with cylinder cover, the other end of rocker arm fixed stud extends cylinder cover and is connected with cylinder cover lock nut, sealing pad block is equipped between cylinder cover lock nut and cylinder cover, rocker arm seat lock nut is installed on rocker arm fixed stud, mounting hole is equipped with structure reinforcing component, structure reinforcing component includes reinforcing rib being arranged in the inner surface of cylinder cover and stamping rib being arranged in the outer surface of cylinder cover;Rock arm seat lock nut and the lower plane of mounting hole are also equipped with adjusting block.The present application improves the rigidity of cylinder cover, and additionally adds adjusting block to support cylinder cover, changes the force from all around to center force for cylinder cover, thereby effectively reduce the deformation in the process of tightening.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engines, and specifically to a sealing installation structure for a stamped cylinder head cover. Background Technology

[0002] The cylinder head cover is an essential component of an internal combustion engine, and there are many types, such as die-cast aluminum, injection-molded engineering plastic, and stamped steel. With the development of the internal combustion engine market, higher requirements have been placed on the sealing performance of cylinder head covers.

[0003] To address the low-cost requirements of small-displacement four-cylinder engines, the industry commonly adopts a steel plate stamping structure. The advantage of this structure is that it is formed in one piece, requiring no secondary processing, resulting in high production efficiency and low cost. However, existing stamped cylinder head covers have the following problems: excessive deformation after tightening, causing interference with surrounding parts; excessive compression deformation, resulting in poor rigidity, which can easily cause irregularly shaped sealing rings to be cut, leading to sealing failure. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a sealing installation structure for a stamped cylinder head cover, the specific technical solution of which is as follows:

[0005] A sealing installation structure for a stamped cylinder head cover includes a cylinder head and a cylinder head cover. A shaped sealing ring is provided at the contact surface between the cylinder head and the cylinder head cover. The cylinder head cover has multiple mounting holes, in which rocker arm fixing studs are arranged. One end of the rocker arm fixing stud is connected to the cylinder head, and the other end extends out of the cylinder head cover and is connected to a cylinder head cover locking nut. A sealing gasket is provided between the cylinder head cover locking nut and the cylinder head cover. A rocker arm seat locking nut is installed on the rocker arm fixing stud. Structural reinforcement components are provided at each mounting hole. These components include reinforcing ribs on the inner surface of the cylinder head cover and stamped ribs on the outer surface of the cylinder head cover. An adjusting block is also provided between the rocker arm seat locking nut and the lower plane of the mounting hole.

[0006] Furthermore, the lower surface of the cylinder head cover locking nut is provided with a first arc surface, and the upper edge of the mounting hole is provided with a second arc surface. The radius of the first arc surface is larger than the radius of the second arc surface, and the first arc surface and the second arc surface are in line contact during installation.

[0007] Furthermore, the reinforcing ribs are spot-welded to the cylinder head cover.

[0008] Furthermore, the bottom of the cylinder head cover is provided with a slot for installing a non-circular seal ring, and the bottom of the non-circular seal ring is provided with two sealing ring bands.

[0009] Furthermore, the height of the stamping ribs and reinforcing ribs is greater than or equal to 5mm, and the width of the ribs is greater than or equal to 10mm.

[0010] Furthermore, the width of the irregularly shaped sealing ring is greater than or equal to 7mm.

[0011] Furthermore, based on the actual measured value of the height of the adjusting block, it is divided into two groups according to the size range. During assembly, a depth gauge is used to measure the distance between the lower plane of the mounting hole and the bottom surface of the cylinder head cover, and the distance between the upper plane of the rocker arm seat locking nut and the top surface of the cylinder head. Based on the allowable compression range when the special-shaped sealing ring is effective, the adjusting block in one of the groups is selected for use.

[0012] Furthermore, the allowable compression range for the shaped sealing ring when it is effective is 0.4-1.6 mm.

[0013] The beneficial effects of this invention are as follows:

[0014] The rigidity of the cylinder head cover is improved by combining external stamping ribs and internal reinforcing ribs, and adjustment blocks are added to support the cylinder head cover. This changes the stress distribution of the cylinder head cover from the periphery to the center, effectively reducing deformation during the tightening process. The adjustment blocks are grouped according to the actual measured dimensions. During assembly, the adjustment blocks are selected reasonably based on the actual dimensions of the parts on site to ensure that the compression of the irregular sealing ring is within the effective sealing range, thus guaranteeing the sealing performance of the cylinder head cover. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the sealing installation structure of the stamped cylinder head cover described in this invention;

[0017] Figure 2 This is a schematic diagram of the reinforcing rib described in this invention;

[0018] Figure 3 This is a schematic diagram of the stamped rib described in this invention;

[0019] Figure 4 This is a schematic diagram of the top seal of the cylinder head cover described in this invention;

[0020] Figure 5 This is a schematic diagram of the bottom seal of the cylinder head cover described in this invention;

[0021] Figure 6 This is a schematic diagram showing the effective sealing of the cylinder head cover after assembly, as described in the embodiment.

[0022] In the diagram: 1. Cylinder head; 2. Rocker arm fixing stud; 3. Sealing gasket; 4. Cylinder head cover locking nut; 5. Cylinder head cover; 6. Irregular sealing ring; 7. Reinforcing rib; 8. Adjusting block; 9. Rocker arm seat locking nut; 10. Stamping rib; 11. Sealing ring; 12. First arc surface; 13. Second arc surface; 14. Slot. Detailed Implementation

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0024] The present invention provides the following specific implementation schemes:

[0025] like Figures 1-5 As shown, the present invention provides a sealing installation structure for a stamped cylinder head cover, including a cylinder head 1, a cylinder head cover 5, and a plurality of rocker arm fixing studs 2. A shaped sealing ring 6 is provided at the contact surface between the cylinder head 1 and the cylinder head cover 5. The cylinder head cover 5 has mounting holes with the same number of rocker arm fixing studs 2 as the number of rocker arm fixing studs 2. Each rocker arm fixing stud 2 is arranged in its corresponding mounting hole. One end of each rocker arm fixing stud 2 is connected to the cylinder head 1, and the other end of each rocker arm fixing stud 2 extends out of the cylinder head cover 5 and is connected to a cylinder head cover locking nut 4. A sealing gasket is provided between the cylinder head cover locking nut 4 and the cylinder head cover 5. 3. The cylinder head cover locking nut 4 secures the cylinder head cover 5 to the cylinder head 1 by locking the sealing gasket 3. The rocker arm fixing stud 2 is equipped with a rocker arm seat locking nut 9. Structural reinforcement components are provided at the mounting holes. The structural reinforcement components include a reinforcing rib 7 on the inner surface of the cylinder head cover 5 and a stamped rib 10 on the outer surface of the cylinder head cover 5. The stamped rib 10 is formed by stamping. An adjusting block 8 is also provided between the rocker arm seat locking nut 9 and the lower plane of the mounting hole. The adjusting block 8 is coaxially mounted on the rocker arm fixing stud 2 and can provide support for the lower plane of the mounting hole.

[0026] Furthermore, the lower surface of the cylinder head cover locking nut 4 is provided with a first arc surface 12, and the upper edge of the mounting hole is provided with a second arc surface 13. The second arc surface 13 is formed by stamping. The radius of the rounded corners of the first arc surface 12 is larger than that of the second arc surface 13. During installation, the first arc surface 12 and the second arc surface 13 form a line seal through line contact. During tightening, because the first arc surface 12 has a large radius of rounded corners and a wide coverage area, it can fit well with the second arc surface 13 and can still fit after deformation, thus ensuring sealing performance.

[0027] Furthermore, the reinforcing rib 7 is spot-welded to the cylinder head cover 5.

[0028] Furthermore, the bottom of the cylinder head cover 5 is provided with a groove 14 for installing the irregular-shaped sealing ring 6. The bottom of the irregular-shaped sealing ring 6 is provided with two sealing rings 11. During assembly, the sealing rings 11 can deform to form a seal. The irregular-shaped sealing ring 6 can be fixed in various ways in the groove 14, such as by dimensional tolerance positioning or by adding a positioning boss, so as to firmly fix the irregular-shaped sealing ring 6 in the groove 14. During the assembly process, the irregular-shaped sealing ring 6 may fall off the wall or be partially exposed.

[0029] Furthermore, the height of the stamping rib 10 and the reinforcing rib 7 is greater than or equal to 5mm, and the width is greater than or equal to 10mm. In addition, the reinforcing rib 7 near the mounting hole can be appropriately enlarged to ensure the rigidity and strength of the cylinder head cover 5 at the mounting hole.

[0030] Furthermore, the width of the irregular sealing ring 6 is greater than or equal to 7mm.

[0031] Furthermore, based on the actual measured value of the height of the adjusting block 8, it is divided into two groups according to the size range. During assembly, a depth gauge is used to measure the distance between the lower plane of the mounting hole and the bottom surface of the cylinder head cover 5, and the distance between the upper plane of the rocker arm seat locking nut 9 and the top surface of the cylinder head 1. Based on the allowable compression range when the irregular sealing ring 6 is effective, the adjusting block 8 in one of the groups is selected for use.

[0032] Furthermore, the allowable compression range for the shaped sealing ring 6 when the seal is effective is 0.4-1.6 mm.

[0033] like Figure 6 The diagram shown illustrates the sealing effect of the cylinder head cover after assembly in this embodiment. The distance from the bottom surface of the cylinder head cover 5 to the lower plane of the mounting hole is defined as A; the distance from the top surface of the cylinder head 1 to the top surface of the rocker arm seat locking nut 9 (i.e., the bottom surface of the adjusting block 8) is defined as B; the height of the adjusting block 8 is defined as C; the gap between the cylinder head cover 5 and the cylinder head 1 after assembly is defined as D; the exposed dimension of the irregular sealing ring 6 in its free state within the slot 14 is defined as E; the compression of the irregular sealing ring 6 after assembly is defined as F, where 0.4mm < F < 1.6mm. The theoretical calculation is as follows:

[0034] The size chain relationship is: D=EF; A+D=B+C.

[0035] Prioritize ensuring F is within the specified range, and then deduce the range of D. Since the dimensional tolerances of A and B are relatively large, to ensure sealing (i.e., meet the F value requirement), the dimensional tolerance range of A is divided into A1 and A2, and the dimensional tolerance range of B is divided into B1 and B2. Using the dimensional chain A+D=B+C, the dimensional tolerance range C1 of the corresponding adjusting block 8 is calculated from the ranges of A1, B1, and D, and the dimensional tolerance range C2 of the corresponding adjusting block 8 is calculated from the ranges of A2, B2, and D.

[0036] During actual assembly, the adjusting block 8 is divided into two groups according to dimensional tolerances C1 and C2. Dimensions A and B are measured on-site using a depth gauge. Based on the actual measurements, cylinder head cover 5 that meets A1, cylinder head 1 with rocker arm installed that meets B1, and adjusting block 8 that meets C1 are selected and assembled together. Similarly, cylinder head cover 5 that meets A2, cylinder head 1 with rocker arm installed that meets B2, and adjusting block 8 that meets C2 are selected and assembled together. This ensures that the compression of the irregular sealing ring 6 is controlled within a reasonable range, thereby guaranteeing the bottom sealing performance. Furthermore, cylinder head cover 5 and cylinder head 1 can be divided into two groups in advance to speed up the assembly process.

[0037] The rigidity of the cylinder head cover 5 is improved by combining external stamping ribs 10 and internal reinforcing ribs 7, and adjustment blocks 8 are added to support the cylinder head cover 5, changing the force distribution of the cylinder head cover 5 from the periphery to the center, thereby effectively reducing deformation during the tightening process. The adjustment blocks 8 are grouped according to the actual measured dimensions, and the adjustment blocks 8 are reasonably selected according to the actual dimensions of the parts on site during assembly to ensure that the compression of the irregular sealing ring 6 is within the effective sealing range, thus ensuring the sealing performance of the cylinder head cover 5.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A sealing mounting structure of a stamping cylinder head cover, comprising a cylinder head (1), a cylinder head cover (5), a special-shaped sealing ring (6) arranged at the contact surface of the cylinder head (1) and the cylinder head cover (5), a plurality of mounting holes arranged on the cylinder head cover (5), a rocker arm fixing stud (2) arranged in the mounting hole, one end of the rocker arm fixing stud (2) connected with the cylinder head (1), the other end of the rocker arm fixing stud (2) extending out of the cylinder head cover (5) and connected with a cylinder head cover locking nut (4), a sealing pad block (3) arranged between the cylinder head cover locking nut (4) and the cylinder head cover (5), and a rocker arm seat locking nut (9) mounted on the rocker arm fixing stud (2), characterized in that: A structural reinforcement assembly is arranged at each mounting hole, which includes a reinforcing rib (7) arranged on the inner surface of the cylinder head cover (5) and a stamping rib (10) arranged on the outer surface of the cylinder head cover (5); an adjusting block (8) is further arranged between the rocker arm seat locking nut (9) and the lower plane of the mounting hole; during assembly, the adjusting block (8) is divided into two groups according to the actual measurement value of the height, the distance between the lower plane of the mounting hole and the bottom surface of the cylinder head cover (5) and the distance between the upper plane of the rocker arm seat locking nut (9) and the top surface of the cylinder head (1) are measured by using a depth gauge, and according to the allowable compression range of the special-shaped sealing ring (6) when the sealing is effective, the adjusting block (8) in one group is selected and used.

2. A sealing mounting structure of a stamping cylinder head cover according to claim 1, characterized in that: The lower surface of the cylinder head cover locking nut (4) is provided with a first circular arc surface (12), the upper edge of the mounting hole is provided with a second circular arc surface (13), the radius of the first circular arc surface (12) is greater than the radius of the second circular arc surface (13), and the linear contact between the first circular arc surface (12) and the second circular arc surface (13) is achieved during installation.

3. A sealed mounting structure for a stamping cylinder head cover according to claim 1, characterized in that: The reinforcing rib (7) is connected with the cylinder head cover (5) by spot welding.

4. The sealed mounting structure for a stamping cylinder head cover according to claim 1, characterized in that: The bottom of the cylinder head cover (5) is provided with a clamping groove (14) for mounting the special-shaped sealing ring (6), and the bottom of the special-shaped sealing ring (6) is provided with two sealing ring bands (11).

5. The sealed mounting structure for a stamping cylinder head cover according to claim 1, characterized in that: The height of the stamping rib (10) and the reinforcing rib (7) is greater than or equal to 5mm, and the width is greater than or equal to 10mm.

6. A sealed mounting structure for a stamping cylinder head cover according to claim 4, characterized in that: The width of the special-shaped sealing ring (6) is greater than or equal to 7mm.

7. The sealed mounting structure for a stamping cylinder head cover according to claim 1, characterized in that: The allowable compression range of the special-shaped sealing ring (6) when the sealing is effective is 0.4-1.6mm.

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