JP2016037866A - Internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine which can improve a seal property between a cylinder head and a cylinder head cover by increasing a joint area between the cylinder head and the cylinder head cover, without changing a shape of the cylinder head cover.SOLUTION: A cylinder head 4 has an insertion hole 12 in which an injector 13 is inserted, an injector hole boss 14 which has a joint surface 14a on an upper surface, and a plurality of seat surfaces 15 formed around the injector hole boss 14 and respectively hold valve springs 16. Between the joint surface 14a and a lower end outer peripheral edge 5a, a plate 22 having a communication hole 22a communicating to the insertion hole 12 is interposed. A part of the plate 22 is superimposed with at least a part of the plurality of seat surfaces 15 and the valve springs 16 in a vertical direction of an engine 3.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an internal combustion engine, and more particularly, to an internal combustion engine in which a valve spring is provided around an injector hole boss into which an injector is inserted.

As an internal combustion engine mounted on a vehicle such as an automobile, for example, the one described in Patent Document 1 is known. In the internal combustion engine described in Patent Document 1, an injector hole boss having an insertion hole into which an injector is inserted is formed in a cylinder head and a joint surface is formed on an upper surface.
A plurality of valve springs are installed around the injector hole boss, and a seating surface for holding each valve spring is formed.

The cylinder head is covered with a cylinder head cover, and the cylinder head cover has a hole communicating with the insertion hole, and a bonding surface formed on the outer peripheral edge of the lower end of the hole and bonded to the bonding surface of the injector hole boss. A fixing member is provided, and a cam housing is provided integrally with the fixing member.
In the conventional internal combustion engine, the sealing performance between the cylinder head and the cylinder head cover can be ensured by the joint surface of the injector hole boss of the cylinder head and the joint surface of the fixing member.

International Publication No. 2007/069447

  In such a conventional internal combustion engine, a plurality of valve springs are installed around the injector hole boss, and a seating surface for holding each valve spring is formed.

  As a result, it is necessary to secure the space for installing the valve spring and the seating surface around the injector hole boss, and the area of the joint surface of the injector hole boss is reduced by that amount.

For this reason, it is necessary to provide a cam housing integrally with the fixing member, and to ensure the area of the joint surface of the fixing member with respect to the joint surface of the injector hole boss by the cam housing.
Therefore, in the conventional internal combustion engine, it is necessary to change the shape of the cylinder head cover in order to ensure the sealing performance between the cylinder head and the cylinder head cover.

  The present invention has been made paying attention to the above-mentioned problems, and without changing the shape of the cylinder head cover, the joining area between the cylinder head and the cylinder head cover can be increased and the cylinder head and the cylinder head cover can be connected to each other. An object of the present invention is to provide an internal combustion engine that can improve the sealing performance.

  The first aspect of the present invention is formed around an injector hole boss having an insertion hole into which an injector is inserted and having a first joint surface on the upper surface, and each holding a valve spring. A cylinder head having a plurality of seating surfaces, an opening communicating with the insertion hole, and a second joining surface formed at the outer peripheral edge of the lower end of the opening and joined to the first joining surface; A cylinder head cover provided at an upper portion of the cylinder head so as to cover the head, wherein the seating surface is formed in parallel to the first joint surface and the second joint surface, and the first joint A plate having a communication hole communicating with the insertion hole is interposed between the surface and the second joint surface, and a part of the plate overlaps at least a part of each of the plurality of seating surfaces in the vertical direction of the internal combustion engine. thing Et al constructed.

  The second aspect of the present invention includes an injector hole boss having an insertion hole into which an injector is inserted and having a first joint surface on the upper surface, and a plurality of valve springs provided around the injector hole boss. A cylinder head having an opening, an opening communicating with the insertion hole, and a second joining surface formed on the outer periphery of the lower end of the opening and joined to the first joining surface so as to cover the cylinder head An internal combustion engine including a cylinder head cover provided on an upper portion of the cylinder head, wherein the valve spring is installed perpendicular to the first joint surface and the second joint surface, A plate having a communication hole communicating with the insertion hole is interposed between the two joint surfaces, and a part of the plate is at least a part of each of the plurality of valve springs in the vertical direction of the internal combustion engine. It consists of made things.

  As described above, according to the first aspect, the plate having the communication hole communicating with the insertion hole of the injector hole boss between the first bonding surface of the injector hole boss and the second bonding surface of the opening. And a part of the plate overlaps at least a part of each of the plurality of seating surfaces in the vertical direction of the internal combustion engine.

  Thereby, the upper part of the seat surface around the injector hole boss can be covered by the plate, and the area of the first joint surface of the injector hole boss can be enlarged by the plate.

  For this reason, it is possible to increase the bonding area between the first bonding surface of the injector hole boss and the second bonding surface of the opening without changing the shape of the cylinder head cover. Therefore, the joint area between the cylinder head and the cylinder head cover can be increased, and the sealing performance between the cylinder head and the cylinder head cover can be improved.

  Moreover, according to said 2nd aspect, the plate which has a communicating hole connected to the insertion hole of an injector hole boss | hub between the 1st bonding surface of an injector hole boss | hub and the 2nd bonding surface of an opening part is provided. A part of the plate is disposed so as to overlap at least a part of each of the plurality of valve springs in the vertical direction of the internal combustion engine.

  Thereby, the upper part of the valve spring around the injector hole boss can be covered by the plate, and the area of the first joint surface of the injector hole boss can be enlarged by the plate.

  For this reason, it is possible to increase the bonding area between the first bonding surface of the injector hole boss and the second bonding surface of the opening without changing the shape of the cylinder head cover. Therefore, the joint area between the cylinder head and the cylinder head cover can be increased, and the sealing performance between the cylinder head and the cylinder head cover can be improved.

FIG. 1 is a diagram showing an embodiment of an internal combustion engine of the present invention, and is a top view of a cylinder head with a plate removed. FIG. 2 is a view showing an embodiment of the internal combustion engine of the present invention, and is a top view of the cylinder head with a plate attached thereto. FIG. 3 is a view showing an embodiment of the internal combustion engine of the present invention, and is a top view of the engine. FIG. 4 is a view showing an embodiment of the internal combustion engine of the present invention, and is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a perspective view of a plate, showing an embodiment of the internal combustion engine of the present invention.

Embodiments of an internal combustion engine according to the present invention will be described below with reference to the drawings.
1 to 5 show an internal combustion engine according to an embodiment of the present invention.
First, the configuration will be described.
1 and 2, a vehicle 1 such as an automobile is provided with an engine room 2, and a diesel engine (hereinafter simply referred to as an engine) 3 as an internal combustion engine is mounted in the engine room 2.

The engine 3 includes a cylinder head 4 attached to an upper portion of a cylinder block (not shown), and a cylinder head cover 5 (see FIGS. 3 and 4) attached to the upper portion of the cylinder head 4 so as to cover the cylinder head 4. ing.
The cylinder block includes a cylinder (not shown) and a piston (not shown) that is movably provided in the cylinder.

  The cylinder head 4 is provided with an intake camshaft 6. The intake camshaft 6 includes a plurality of intake cams 6a in the axial direction. The cylinder head 4 is provided with an exhaust camshaft 7 in parallel with the intake camshaft 6, and the exhaust camshaft 7 includes a plurality of exhaust cams 7a in the axial direction.

  1 and 4, lower cam housings 8A and 8B are formed on the upper portion of the cylinder head 4, and the intake cam shaft 6 and the exhaust cam shaft 7 are rotatably mounted on the lower cam housings 8A and 8B. .

  In FIG. 2, upper cam housings 9A and 9B are attached to lower cam housings 8A and 8B by bolts 10, and upper cam housings 9A and 9B together with lower cam housings 8A and 8B, intake camshaft 6 and exhaust camshaft. 7 is rotatably held.

  Here, the upper cam housing 9A constitutes the intake cam housing of the present invention, and the upper cam housing 9B constitutes the exhaust cam housing of the present invention. Further, the cylinder head 4 and the upper cam housings 9A and 9B of the present embodiment are made of metal such as aluminum or cast iron, for example. The cylinder head cover 5 is made of resin.

  In FIG. 1, the cylinder head 4 includes an inner wall 11 that extends in parallel with the intake camshaft 6 and the exhaust camshaft 7. An insertion hole 12 is formed in the middle wall 11, and an injector 13 is inserted into the insertion hole 12 (see FIG. 3).

  A fuel injection hole (not shown) is formed at the tip of the injector 13, and the fuel injection hole is desired in a combustion chamber (not shown) surrounded by the bottom surface of the cylinder head 4, the top surface of the piston, and the inner wall of the cylinder. Therefore, the injector 13 injects fuel directly into the combustion chamber.

  In FIG. 1 and FIG. 4, a part of the inner wall 11 constitutes an injector hole boss 14, and the injector hole boss 14 has an insertion hole 12. A joint surface 14 a is formed on the upper surface of the injector hole boss 14, and the joint surface 14 a is constituted by the periphery of the injector hole boss 14 at the upper end of the insertion hole 12. The joining surface 14a constitutes the first joining surface of the present invention.

  1 and 4, the cylinder head 4 has a seating surface 15, and the seating surfaces 15 are formed in a set of four around the injector hole boss 14. In FIG. 4, the seat surface 15 holds a valve spring 16, and the valve spring 16 biases the intake valve 17 and the exhaust valve 18 upward. Here, energizing means increasing the momentum.

  In FIG. 4, a communication hole 19 that communicates with the seat surface 15 is formed in the cylinder head 4, and the intake valve 17 and the exhaust valve 18 are inserted into the communication hole 19 via a valve guide 20. A spring retainer 21 is attached to the upper ends of the intake valve 17 and the exhaust valve 18, and the valve spring 16 is interposed between the spring retainer 21 and the seat surface 15.

  A rocker arm 23 is in contact with the upper ends of the intake valve 17 and the exhaust valve 18 (see FIGS. 1 and 2). The rocker arm 23 presses the intake valve 17 and the exhaust valve 18 downward against the spring force of the valve spring 16 as the intake cam 6a and the exhaust cam 7a rotate. Thereby, an intake port and an exhaust port (not shown) formed in the cylinder head 4 communicate with the combustion chamber.

  In FIG. 4, the cylinder head cover 5 has an opening 5A. The opening 5A communicates with the insertion hole 12 of the cylinder head 4, and the injector 13 is inserted into the insertion hole 12 through the opening 5A.

  The lower end outer peripheral edge 5a of the opening 5A faces the joint surface 14a of the injector hole boss 14, and the lower end outer peripheral edge 5a constitutes the second joint surface of the present invention. Further, the seat surface 15 of the present embodiment is formed in parallel to the lower end outer peripheral edges 5a and 14a, and the valve spring 16 is installed perpendicular to the lower end outer peripheral edges 5a and 14a.

  The cylinder head 4 is provided with a plate 22, and the plate 22 is made of a metal such as aluminum or cast iron. As shown in FIG. 5, the plate 22 has a communication hole 22 a that communicates with the insertion hole 12 of the injector hole boss 14. As shown in FIG. 4, the upper cam housings 9 </ b> A and 9 </ b> B are connected to the plate 22. Yes. Here, either one of the upper cam housings 9 </ b> A and 9 </ b> B may be coupled to the plate 22.

  In FIG. 4, the plate 22 is interposed between the lower peripheral edge 5a and the joint surface 14a. As shown in FIGS. 2 and 4, the plate 22 projects in the left-right direction from the joint surface 14a. Of the plurality of seating surfaces 15 and a part of each of the valve springs 16.

Next, the operation will be described.
In the cylinder head 4 of the present embodiment, a plurality of seating surfaces 15 are formed around the injector hole boss 14, and a plurality of valve springs 16 are installed on the seating surface 15. Further, in the cylinder head 4 of the present embodiment, the seat surface 15 is formed in parallel to the lower end outer peripheral edges 5a and 14a, and the valve spring 16 is installed perpendicular to the lower end outer peripheral edges 5a and 14a.

  As a result, it is necessary to secure the installation space for the valve spring 16 and the space for the seating surface 15 around the injector hole boss 14, and the area of the joint surface 14 a of the injector hole boss 14 is reduced to the extent that the space is required. .

  Therefore, in the cylinder head 4 of the present embodiment, a plate 22 having a communication hole 22a communicating with the insertion hole 12 is interposed between the joint surface 14a and the lower outer peripheral edge 5a. In the vertical direction, the plurality of seating surfaces 15 and the valve springs 16 are configured to overlap at least a part of each.

  Thereby, the seat surface 15 around the injector hole boss 14 and the upper part of the valve spring 16 can be covered by the plate 22, and the area of the joint surface 14 a of the injector hole boss 14 can be increased by the plate 22.

  For this reason, the joining area of the joining surface 14a of the injector hole boss 14 and the lower peripheral edge 5a of the opening 5A can be increased by the plate 22 without changing the shape of the cylinder head cover 5. Therefore, the joint area between the cylinder head 4 and the cylinder head cover 5 can be increased, and the sealing performance between the cylinder head 4 and the cylinder head cover 5 can be improved.

  Further, according to the cylinder head 4 of the present embodiment, the intake camshaft 6 and the exhaust camshaft 7 are disposed on the upper portion of the cylinder head 4 and the plurality of upper cam housings that rotatably support the intake camshaft 6 on the cylinder head 4. 9A and a plurality of upper cam housings 9B that rotatably support the exhaust camshaft 7 on the cylinder head 4 are provided, and the cylinder head cover 5 is composed of different materials for the upper cam housings 9A and 9B.

  Here, in the engine 3, in order to easily manufacture the cylinder head cover 5, the cylinder head cover 5 and the upper cam housings 9A and 9B are preferably formed integrally. However, since the upper cam housings 9A and 9B that rotatably support the intake camshaft 6 and the exhaust camshaft 7 need to ensure rigidity, the cylinder head cover 5 must also be made of a material having rigidity.

  In contrast, the cylinder head 4 of the present embodiment is provided with a plate 22 that is separate from the cylinder head cover 5, and the area of the joint surface of the joint surface 14 a of the injector hole boss 14 can be increased by this plate 22.

  Thereby, the cylinder head 4 of this embodiment does not need to form the cylinder head cover 5 and upper cam housing 9A, 9B integrally, and can be comprised from a different raw material.

  Therefore, the cylinder head cover 5 of this embodiment can be comprised from a resin material. As a result, the cylinder head cover 5 can be reduced in weight, and the engine 3 can be reduced in weight.

  Further, according to the cylinder head 4 of the present embodiment, the plate 22 is connected to the upper cam housings 9A and 9B.

  Thereby, the plate 22 can be enlarged using the upper cam housings 9A and 9B, and even if the area of the joint surface 14a of the injector hole boss 14 is small, the area of the joint surface 14a is reduced to the plate 22. The area can be increased more effectively by the area of the upper cam housings 9A and 9B. Therefore, the joint area between the cylinder head 4 and the cylinder head cover 5 can be increased more effectively.

  In addition, although the engine 3 of this embodiment is comprised from the diesel engine, you may be comprised from a gasoline engine etc. In addition, a spark plug may be inserted into the insertion hole 12 instead of the injector 13.

  Further, the engine 3 of the present embodiment is configured such that a part of the plate 22 overlaps at least a part of each of the plurality of seating surfaces 15 and the valve springs 16 in the vertical direction of the engine 3.

  However, the configuration is not limited to this, and a part of the plate 22 may overlap all of the plurality of seating surfaces 15 and the valve springs 16 in the vertical direction of the engine 3.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

  DESCRIPTION OF SYMBOLS 3 ... Engine (internal combustion engine), 4 ... Cylinder head, 5 ... Cylinder head cover, 5A ... Opening, 5a ... Outer peripheral edge of lower end, 5a ... Joining surface (second joining surface), 6 ... Intake camshaft, 7 ... Exhaust Camshaft, 9A ... Upper cam housing (intake cam housing), 9B ... Upper cam housing (exhaust cam housing), 12 ... Insertion hole (insertion hole of injector hole boss), 13 ... Injector, 14 ... Injector hole boss, 14a ... Joint surface (first joint surface), 15 ... seat surface, 16 ... valve spring, 22a ... communication hole (plate communication hole)

Claims (5)

Cylinder having an insertion hole into which the injector is inserted and having a first joint surface on the upper surface, and a plurality of seating surfaces formed around the injector hole boss, each holding a valve spring Head,
The cylinder head includes an opening communicating with the insertion hole and a second joining surface that is configured by an outer peripheral edge at a lower end of the opening and faces the first joining surface, and covers the cylinder head. A cylinder head cover provided at the top of the
The internal combustion engine, wherein the seating surface is formed in parallel to the first joint surface and the second joint surface,
A plate having a communication hole communicating with the insertion hole is interposed between the first bonding surface and the second bonding surface;
A part of the plate overlaps at least a part of each of the plurality of seating surfaces in the vertical direction of the internal combustion engine. A cylinder head having an insertion hole into which the injector is inserted, an injector hole boss having a first joint surface on the upper surface, and a plurality of valve springs provided around the injector hole boss;
The cylinder head includes an opening communicating with the insertion hole and a second joining surface that is configured by an outer peripheral edge at a lower end of the opening and faces the first joining surface, and covers the cylinder head. A cylinder head cover provided at the top of the
The valve spring is an internal combustion engine installed perpendicular to the first joint surface and the second joint surface;
A plate having a communication hole communicating with the insertion hole is interposed between the first bonding surface and the second bonding surface;
A part of the plate overlaps at least a part of each of the plurality of valve springs in the vertical direction of the internal combustion engine. An upper portion of the cylinder head includes an intake cam shaft and an exhaust cam shaft, at least one intake cam housing that rotatably supports the intake cam shaft on the cylinder head, and the exhaust cam shaft rotatably on the cylinder head. And at least one exhaust cam housing to support,
The internal combustion engine according to claim 1 or 2, wherein the cylinder head cover is made of a material different from that of the intake cam housing and the exhaust cam housing.   The internal combustion engine according to claim 3, wherein the plate is connected to at least one of the intake cam housing and the exhaust cam housing.   The internal combustion engine according to any one of claims 1 to 4, wherein the cylinder head cover is made of resin.

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