Cylinder head cover

Abstract

To provide a cylinder head cover that reduces the complicated work required when attaching components with different mounting angles to the cylinder head.SOLUTION: A cylinder head cover includes a plurality of mounting holes that correspond to each of plural types of components having different mounting angles to a cylinder head. The cross section of a first mounting hole among the plurality of mounting holes corresponding to a first component among the plural types of components has a circular shape, and the cross section of a second mounting hole among the plurality of mounting holes corresponding to a second component among the plural types of components, which is different in type from the first component, has a shape with a hole diameter longer in the inclination direction of the second component.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a cylinder head cover. [Background technology]

[0002] A head cover is attached to the top of the cylinder head of an internal combustion engine so as to cover the cylinder head. Tube mounting holes for fitting spark plug tubes and injector tubes pass through the head cover. Depending on the internal combustion engine, the central axes of the injector tube and the spark plug tube may not be parallel to each other.

[0003] In this case, when the head cover is attached to the cylinder head by moving it along the central axis of one of the tubes, depending on the angle between the central axes, the movement direction of the head cover may not be aligned with the central axis of the other tube. As a result, when attaching the head cover to the cylinder head, problems such as damage to the other tube or increased installation time may occur. To address this issue, a head cover that is divided into an injector holder and a head cover main body has been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-067190 Summary of the Invention [Problem to be solved by the invention]

[0005] An injector is inserted into the injector tube. Therefore, the injector is attached to the cylinder head via the injector tube. Furthermore, a spark plug is inserted into the spark plug tube. Therefore, the spark plug is attached to the cylinder head via the spark plug tube. Therefore, if the central axes of the injector tube and the spark plug tube are not parallel to each other, different types of components, such as the injector and the spark plug, will be attached to the cylinder head at different angles.

[0006] If the head cover were divided into an injector holder and a head cover body to prevent damage to the tubes that could occur when the mounting angles differ, the work of attaching the head cover to the cylinder head could become complicated. For example, the work of attaching the injector holder to the cylinder head and the work of attaching the head cover body to the cylinder head could be performed separately.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a cylinder head cover that reduces the complicated work required when attaching components with different mounting angles to a cylinder head. [Means for solving the problem]

[0008] The cylinder head cover according to the present invention includes a plurality of mounting holes corresponding to a plurality of types of parts each having a different mounting angle to the cylinder head, wherein a first mounting hole among the plurality of mounting holes corresponding to a first part among the plurality of types of parts has a circular cross-sectional shape, and a second mounting hole among the plurality of mounting holes corresponding to a second part among the plurality of types of parts that is a different type from the first part has a cross-sectional shape with a hole diameter that is longer in the inclination direction of the second part. [Effects of the Invention]

[0009] According to the present invention, it is possible to reduce the complicated work required when attaching parts with different attachment angles to a cylinder head. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a perspective view of an example of a cylinder head. [Figure 2] FIG. 2 is a cross-sectional view of an example of a cylinder head cover. [Figure 3] FIG. 2 is a plan view of an example of a cylinder head cover. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0012] As shown in Figure 1, the cylinder head 10 has a generally rectangular parallelepiped shape. Four intake ports 11 open on one of a pair of longitudinal side surfaces of the cylinder head 10. Each intake port 11 extends from the longitudinal side surface toward a combustion chamber provided on the underside of the cylinder head 10. Outside air is supplied into the combustion chamber through these intake ports 11. Although not shown, exhaust ports are also provided in the cylinder head 10 for discharging exhaust gas from the combustion chamber. The exhaust ports extend from the combustion chamber and open on the side surface opposite the side surface on which the intake ports 11 open.

[0013] Four first insertion holes 13 are provided on the exhaust port side of the cylinder head 10. The first insertion holes 13 are circular holes in a plan view. The first insertion holes 13 penetrate the cylinder head 10 in the vertical direction. The four first insertion holes 13 are arranged at equal intervals in the longitudinal direction of the cylinder head 10. The four first insertion holes 13 also extend parallel to one another.

[0014] Four second insertion holes 14 are provided on the intake port 11 side of the cylinder head 10. Like the first insertion holes 13, the second insertion holes 14 are circular holes in a plan view. The second insertion holes 14 penetrate the cylinder head 10 from top to bottom. The four second insertion holes 14 are arranged at equal intervals in the longitudinal direction of the cylinder head 10. The four second insertion holes 14 also extend parallel to one another.

[0015] 2, the central axes J1 of the four first insertion holes 13 are non-parallel to the central axes J2 of the second insertion holes 14 in a cross-sectional view including both the central axes J1 of the first insertion holes 13 and the central axes J2 of the second insertion holes 14. In other words, the central axes J1 of the first insertion holes 13 and the central axes J2 of the second insertion holes 14 extend in a substantially V-shape.

[0016] As shown in FIG. 1 , a first tube 23 is attached to the first insertion hole 13. The first tube 23 is cylindrical. The outer diameter of the first tube 23 is approximately the same as the inner diameter of the first insertion hole 13. The first tube 23 is inserted into the first insertion hole 13 so as to be coaxial with the first insertion hole 13. In other words, the central axis of the first tube 23 is the central axis J1 of the first insertion hole 13. The axial length of the first tube 23 is longer than the axial length of the first insertion hole 13. A portion of the first tube 23 protrudes from the first insertion hole 13 upward from the cylinder head 10.

[0017] A second tube 24 is attached to the second insertion hole 14. The second tube 24 is cylindrical. The outer diameter of the second tube 24 is approximately the same as the inner diameter of the second insertion hole 14. The second tube 24 is inserted into the second insertion hole 14 so as to be coaxial with the second insertion hole 14. In other words, the central axis of the second tube 24 is the central axis J2 of the second insertion hole 14. The axial length of the second tube 24 is longer than the axial length of the second insertion hole 14. A portion of the second tube 24 protrudes from the second insertion hole 14 upward from the cylinder head 10.

[0018] As described above, the first insertion hole 13 and the second insertion hole 14 extend in a substantially V-shape in a cross-sectional view. Therefore, as shown in Fig. 2, the first tube 23 and the second tube 24 also extend non-parallel to form a substantially V-shape in a cross-sectional view including both the central axis J1 of the first insertion hole 13 and the central axis J2 of the second insertion hole 14.

[0019] 2, a generally rod-shaped spark plug 50 for igniting fuel injected into the combustion chamber is inserted into the first tube 23. The spark plug 50 is an example of a first component, and is positioned and protected by the first tube 23. The tip of the spark plug 50 is located within the combustion chamber. A portion of the base end of the spark plug 50 is exposed above the first tube 23. Although not shown, an electrical wiring that applies high voltage to the spark plug 50 is connected to the base end of the spark plug 50.

[0020] 2, a generally rod-shaped injector 60 for injecting fuel into the combustion chamber is inserted into the second tube 24. The injector 60 is an example of a second part, and is positioned and protected by the second tube 24. The tip of the injector 60 is located within the combustion chamber. A portion of the base end of the injector 60 is exposed above the second tube 24. Although not shown, the base end of the injector 60 is connected to a delivery pipe that supplies fuel from a fuel tank to the injector 60. The spark plug 50 and the injector 60 are examples of multiple types of parts.

[0021] As shown in Figure 2, the cylinder head cover 34 is attached to the cylinder head 10. As shown in Figure 3, the cylinder head cover 34 has a generally rectangular shape overall. The longitudinal length of the cylinder head cover 34 is approximately the same as the longitudinal length of the cylinder head 10. The lateral length of the cylinder head cover 34 is approximately the same as the lateral length of the cylinder head 10. This allows the cylinder head cover 34 to cover the entire cylinder head 10 by itself.

[0022] As shown in FIG. 3, four circular, e.g., perfect, first mounting holes 43 penetrate the cylinder head cover 34. The cross-sectional shape of each of the four first mounting holes 43 is circular. That is, the first mounting holes 43 are round holes. The four first mounting holes 43 are arranged side by side in the longitudinal direction of the cylinder head cover 34. The pitch between the central axes of the first mounting holes 43 matches the pitch between the central axes J1 of the first tubes 23. As shown in FIG. 2, annular sealing material 40 is fitted into the first mounting holes 43. Note that the sealing material 40 is not shown in FIG. 3 because it is hidden by the base end of the spark plug 50.

[0023] In addition to the first mounting hole 43, four second mounting holes 44 having a non-circular shape, such as an oval, penetrate the cylinder head cover 34. The cross-sectional shape of each of the four second mounting holes 44 is longer than the diameter of the first mounting hole 43 in the tilt direction of the injector 60. For example, the second mounting holes 44 include elongated holes. The four second mounting holes 44 are arranged side by side in the longitudinal direction of the cylinder head cover 34. The pitch between the central axes of the second mounting holes 44 matches the pitch between the central axes J2 of the second tubes 24. As shown in FIGS. 2 and 3, an oval ring-shaped seal 41 is fitted into the second mounting hole 44.

[0024] 2, when the cylinder head cover 34 is attached to the cylinder head 10, the first tube 23 of the cylinder head 10 is fixed in the first mounting hole 43 of the cylinder head cover 34. Specifically, the upper end of the first tube 23 is fitted into the first mounting hole 43 of the cylinder head cover 34 with the seal material 40 interposed therebetween.

[0025] Furthermore, when the cylinder head cover 34 is attached to the cylinder head 10, the second tube 24 of the cylinder head 10 is fixed in the second mounting hole 44 of the cylinder head cover 34. Specifically, the upper end of the second tube 24 is fitted into the second mounting hole 44 of the cylinder head cover 34 with a seal member 41 interposed therebetween.

[0026] As described above, the cylinder head cover 34 includes a first mounting hole 43 and a second mounting hole 44 as a plurality of mounting holes. The first mounting hole 43 corresponds to the spark plug 50, and the second mounting hole 44 corresponds to the injector 60. The spark plug 50 and the injector 60 are different types. The cross-sectional shape of the first mounting hole 43 is a perfect circle. That is, the first mounting hole 43 is a circular hole. On the other hand, the cross-sectional shape of the second mounting hole 44 is non-circular. Specifically, the cross-sectional shape of the second mounting hole 44 is an oval that is longer in the tilt direction of the injector 60 than the diameter of the first mounting hole 43. As described above, the second mounting hole 44 is an elongated hole.

[0027] Even if the mounting angles of the spark plug 50 and the injector 60 are different, the difference and variations in the mounting angles are absorbed when the injector 60 is mounted to the cylinder head 10 via the second tube, due to the second mounting hole 44. Therefore, the complicated work required to mount the cylinder head cover 34 to the cylinder head 10 is reduced, even if the cylinder head cover 34 does not need to be divided.

[0028] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention as described in the claims.

[0029] For example, in the above-described embodiment, an oval is used as an example of the cross-sectional shape of the second mounting holes 44, but the cross-sectional shape is not limited to an oval, and the second mounting holes 44 may have an ellipse or other shape. Also, the second mounting holes 44 may be circular holes and the first mounting holes 43 may be elongated holes. Furthermore, the cross-sectional shapes of the four second mounting holes 44 may all have a diameter that is shorter than the diameter of the first mounting holes 43 in the tilt direction of the injector 60. [Explanation of symbols]

[0030] 10. Cylinder head 34 Cylinder head cover 43 First mounting hole 44 Second mounting hole 50 Spark Plugs 60 injectors J1,J2 Center axis line

Claims

[Claim 1] A cylinder head cover including a plurality of mounting holes corresponding to a plurality of types of components each having a different mounting angle to the cylinder head, a first mounting hole among the plurality of mounting holes, which corresponds to a first component among the plurality of types of components, has a circular cross-sectional shape; a second mounting hole among the plurality of mounting holes, which corresponds to a second component among the plurality of components different in type from the first component, has a cross-sectional shape with a hole diameter that is long in an inclination direction of the second component; A cylinder head cover characterized by:

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