JP2003193907A - Engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine with a suppressing means 10, capable of suppressing uneven diametrical expansion of the upper part of the cylinder bore 4 or degradation of the roundness caused by combustion pressure or heat. <P>SOLUTION: A reinforced ring 15 is provided on the upper part of a cylinder bore 4 located inward of a water jacket 5. A supporting surface 1C of a cylinder block 1 and the reinforced ring 15 attached thereto constitute a suppressing means 10 suppressing the diametrical expansion of the upper part of a cylinder bore 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine, and more particularly to an engine configured so that deformation of an upper portion of a cylinder bore can be suppressed.

[0002]

2. Description of the Related Art Conventionally, as an engine, a cylinder block having a water jacket surrounding a cylinder bore and having an opening on the upper surface, a cylinder head connected to the cylinder block, an upper surface of the cylinder block and a lower surface of the cylinder head are provided. With a cylinder head gasket interposed therebetween to maintain a seal between them is known.

[0003]

By the way, in the above-mentioned conventional engine, the one in which the water jacket is opened on the upper surface of the cylinder block is generally called an open jacket. Since such an open jacket surrounds the cylinder bore and opens on the upper surface of the cylinder block as described above, the upper portion of the cylinder bore expands unevenly due to the influence of combustion pressure and heat, and the true diameter of the upper portion of the cylinder bore is increased. There was a drawback that the roundness was likely to deteriorate. When the roundness of the upper portion of the cylinder bore is deteriorated as described above, the consumption of engine oil may be increased, and the piston fitted in the cylinder bore may be seized. Conventionally, for example, Japanese Patent Laid-Open No. 11-294254 has been proposed as a technique for improving a water jacket. In the connection structure disclosed in this publication, the gasket is formed with a throttle portion projecting downward, and the throttle portion is inserted into the water jacket from above. However, even with the configuration disclosed in the above publication, since the throttle portion is not in close contact with both wall surfaces of the water jacket, the upper portion of the cylinder bore is unevenly expanded in diameter and the roundness is deteriorated. It was difficult to suppress.

[0004]

In view of the above-mentioned circumstances, the present invention provides a cylinder block having a water jacket which surrounds a cylinder bore and opens on the upper surface, a cylinder head connected to the cylinder block, and the cylinder block. An engine having a cylinder head gasket interposed between the upper surface of the cylinder head and the lower surface of the cylinder head to maintain a seal therebetween, at a position above the cylinder bore in the cylinder block and from the water jacket. Also, a suppressing means for suppressing the diameter expansion of the upper portion of the cylinder bore is provided at a position on the cylinder bore side.

According to this structure, when the upper portion of the cylinder bore tries to expand the diameter due to combustion pressure or heat,
The upper part of the cylinder bore is unevenly expanded in diameter, and the roundness can be prevented from being deteriorated by the suppressing means.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the illustrated embodiments. In FIGS. 1 to 3, reference numeral 1 is a cylinder block of an automobile engine. This cylinder block 1
A thin plate-shaped cylinder head gasket 2 is placed on the upper surface 1A of the cylinder, and a cylinder head 3 is further placed from above, and the cylinder block 1 and the cylinder head 3 in that state
And are connected by a plurality of connecting bolts. By thus interposing the cylinder head gasket 2 between the upper surface 1A of the cylinder block 1 and the lower surface 3A of the cylinder head, airtightness is maintained between the upper surface 1A of the cylinder block 1 and the lower surface 3A of the cylinder head 3. I am trying. The cylinder block 1 is made of an aluminum alloy, and as shown in a plan view of FIG. 1, cylinder bores 4 are formed at three positions on a straight line at equal intervals. Then, the cylinder bores 4 provided at these three locations
An endless water jacket 5 is formed on the upper surface 1A of the cylinder block 1 so as to surround the whole. The water jacket 5 in this embodiment is referred to as an "open jacket" in which the upper opening 5A is opened on the upper surface 1A of the cylinder block 1. As shown in FIG. 3, when the cylinder block 1 and the cylinder head 2 are connected with the cylinder head gasket 2 interposed, the upper opening 5A of the water jacket 5 is completely covered by the cylinder head gasket 2. The cylinder block 1 and the cylinder head 3 can be cooled by circulating cooling water in the water jacket 5 in that state. Eight bolt holes 6 are formed in the upper surface 1A of the cylinder block 1 which is located near and outside the water jacket 5, and blow-by holes 7 and oil holes 8 are formed in the cylinder block 1 at required positions. is doing. In the cylinder block 1, the part marked EX in FIG. 1 is on the exhaust manifold side, and the part marked IN is on the intake manifold side. The cylinder head gasket 2 is made of thin plate-shaped iron, and as shown in FIG. 2, three combustion chamber holes 11 are formed in accordance with the positions of the cylinder bores 4 of the cylinder block 1. Further, the cylinder head gasket 2 is provided with a bolt hole 12 corresponding to the position of the bolt hole 6 on the cylinder block 1 side.
Similarly, an oil hole 13 and a blow-by hole 14 are formed. Further, the cylinder head gasket 2 is provided with a conventionally known bead portion 2A which surrounds each combustion chamber hole 11 and which bulges downward with an arcuate cross section. The cylinder head 2 is made of an aluminum alloy, and as shown in FIG. 3, a circular recess 3B is formed in accordance with the position of the cylinder bore 4 on the side of the cylinder block 1 as in the case of a conventionally known one. As described above, the automobile engine of this embodiment includes the cylinder head 3, the cylinder head gasket 2, and the cylinder block 1.

In this embodiment, however, the suppressing means 10 is provided at the position above the cylinder bore 4 in the cylinder block 1 to prevent the upper part of the cylinder bore 4 from expanding in diameter. That is, as shown in FIGS. 1 and 3, the upper portion of the cylinder bore 4 which is the inner side (cylinder bore 4 side) of the water jacket 5 is made lower by a predetermined dimension than the original upper surface 1A. There is. As a result, an annular supporting surface 1C that is continuous in the circumferential direction is formed, and with the formation of this supporting surface 1C, a pair of arcs is formed at the upper edge of the cylinder bore 4 on the center side in FIG. The positioning step portion 1D is formed, and one positioning step portion 1D is formed at each position of the cylinder bores 4 on both sides in FIG. In the present embodiment, the outer peripheral portion is engaged with the positioning step portion 1D for positioning, and then the reinforcing rings 15 are mounted on the respective support surfaces 1C. Reinforcing ring 15
Is made of an iron-based material or SUS material that has rigidity and strength and has a small coefficient of thermal expansion with respect to aluminum. The inner diameter of the reinforcing ring 15 is set to be the same as the diameter of the cylinder bore 4. As shown in FIG. 3, the outer diameter of the reinforcing ring 15 is such that the outer peripheral surface of the reinforcing ring 15 is the same as the inner wall surface 5B of the water jacket 5 when the reinforcing ring 15 is mounted on the support surface 1C. The dimensions are set so that they are on the same plane. That is, the reinforcement ring 1
The inner peripheral surface of 5 substantially constitutes the upper end of the cylinder bore 4, and the outer peripheral surface of the reinforcing ring 15 substantially constitutes the inner wall surface 5B of the water jacket 5. The thickness (axial dimension) of the reinforcing ring 15 is set to a dimension corresponding to the difference in height between the support surface 1C and the original upper surface 1A. Further, the upper surface 15a of the reinforcing ring 15
Is a flat surface, and the bead portion 2A of the cylinder head gasket 2 is placed on the upper surface 15a. On the other hand, on the lower surface (bottom surface) of the reinforcing ring 15, two annular grooves 15A that are continuous in the circumferential direction are concentrically formed. These annular grooves 15A have a triangular cross section and are set to have the same dimensions.

On the other hand, the supporting surface 1C on the cylinder block 1 side
In this, two annular projections 1E that are continuous in the circumferential direction are formed concentrically. The cross-sectional shape and dimensions of these annular protrusions 1E and the installation positions in the radial direction are adjusted so as to coincide with the two annular grooves 15A formed on the side of the reinforcing ring 15. The outer peripheral portion of the reinforcing ring 15 is positioned at the positioning step portion 1
D and the adhesive sealant 18 is applied to the lower surface annular groove 15A and the annular projection 1E on the supporting surface 1C side is engaged therewith, whereby the bottom surface of the reinforcing ring 15 is supported on the supporting surface 1C. Is attached to. In this way the support surface 1
When the reinforcing ring 15 is attached on C. The annular groove 15A
The annular projection 1E and the annular projection 1E are joined by the adhesive sealant 18, and the seal between them is maintained. That is, the adhesive sealant 18 functions as a sealing means and can maintain the seal between the lower surface of the reinforcing ring 15 and the support surface 1C. Further, the reinforcing ring 15 mounted on the support surface 1C has its axial dimension adjusted so that its upper surface 15a is flush with the upper surface 1A of the cylinder block 1. Further, the inner peripheral surface of the reinforcing ring 15 is flush with the original peripheral surface of the cylinder bore 4. That is, the inner peripheral surface of the reinforcing ring 15 constitutes the upper end of the cylinder bore 4. The outer peripheral surface of the reinforcing ring 15 is flush with the inner wall surface 5B of the water jacket 5 and constitutes a part of the wall surface 5B. The outer peripheral surface of the reinforcing ring 15 may be configured to project toward the water jacket 5 side as necessary. As can be understood from the above description, in the present embodiment, the reinforcing ring 15 and the annular groove 15A thereof, and the support surface 1C and the annular protrusion 1E thereof constitute the suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. is doing. As described above, in this embodiment, at the position on the inner side of the water jacket 5 (the side of the cylinder bore 4), and
Suppressing means 10 is provided at the upper part of each cylinder bore 4. Reinforcing rings 15 are provided on each of the three supporting surfaces 1C.
When the cylinder head 3 is attached to the cylinder block 1 having the above-described structure with the connecting bolts as described above, the reinforcing ring 15 is strongly sandwiched by the supporting surface 1C and the lower surface 3A of the cylinder head 2 from above and below. . Therefore, the annular protrusion 1E of the support surface 1C and the annular groove 15A of the reinforcing ring 15 are more firmly adhered to each other via the adhesive sealant 18. Then, the seal between the support surface 1C and the lower surface of the reinforcing ring 15 is maintained by the adhesive sealant 18. The upper surface 15a of the reinforcing ring 15 and the lower surface 3A of the cylinder head 3 make the cylinder head gasket 2
Is strongly clamped, the cylinder head gasket 2
At the same time that the bead portion 2A comes into close contact with the upper surface 15a of the reinforcing ring 15, the lower surface 3A of the cylinder head 3 comes into close contact with the upper surface of the cylinder head gasket 2. Therefore, the cylinder head gasket 2 maintains a seal between the lower surface 3A of the cylinder head 3 and the upper surface 15a of the cylinder block 1 and the reinforcing ring 15. The shapes of the annular groove 15A and the annular protrusion 1E,
The number and size may be appropriately set according to the conditions of the applied engine.

As described above, in this embodiment, the suppressing means 10 is provided at the position above the cylinder bore 4 in the cylinder block 1. Therefore, when the cylinder block 1 and the cylinder head 3 are pressurized or heated to a high temperature even though the cylinder block 1 is provided with the water jacket 5 that is open to the upper surface 1A, which is called an open jacket, the pressure is increased. The suppressing means 1 prevents the upper part of the cylinder bore 4 from being unevenly expanded in diameter to the EX side and the IN side in FIG.
It can be suppressed by 0. More specifically, since the reinforcing ring 15 having rigidity is attached to the support surface 1C, when the upper part of the cylinder bore 4 is about to be expanded in diameter by heat, the reinforcing ring 15 expands the upper part of the cylinder bore 4. Can be suppressed. According to an experiment conducted by the inventor, in the present embodiment in which the suppressing means 10 is provided, the upper end portion of the cylinder bore 4 is about 50% as compared with the conventional cylinder block 1 in which the suppressing means 10 is not provided. It was possible to suppress the expansion of the diameter. FIG. 4 shows a cross section of a conventional engine without a reinforcing ring. As shown in FIG. 4, since the upper opening 5A of the water jacket 5 is open to the upper surface 1A of the cylinder block 1, in the conventional case, as shown by an imaginary line, the upper portion of the cylinder bore 4 has a combustion pressure. There was a drawback that the diameter increased to the water jacket 5 side due to heat. When the diameter of the upper portion of the cylinder bore 4 is increased in this way, the consumption of engine oil is increased and the piston may be seized in the cylinder bore 4. In contrast to such a conventional cylinder block, in this embodiment, the suppression means 10 is provided, so that the diameter expansion amount of the cylinder bore 4 can be suppressed by about 50%. Therefore, in the present embodiment, it is possible to suppress an increase in engine oil consumption as compared with the conventional one shown in FIG.
It is possible to reduce the risk of the piston seizing due to the expansion of the diameter.

------- (Second Embodiment) Next, FIG. 5 shows a second embodiment of the present invention. In the second embodiment, the second embodiment is the same as the first embodiment. The annular projection 1E having a triangular cross section and the annular groove 15A are omitted, and instead, an annular recess 1E ′ having a rectangular cross section and an annular projection 15A having a rectangular cross section to be engaged with the annular recess 1E ′ are provided. The annular recess 1E ′ is provided at a position above and adjacent to the wall surface 5B of the water jacket 5, and an annular protrusion 15A is provided on the outer peripheral surface of the lower surface of the reinforcing ring 15 so as to match the size and position of the annular recess 1E ′. ing. Then, the adhesive sealant 1 is applied to the annular recess 1E ′.
8 is applied and then the annular projection 15A is engaged therewith, and the lower surface of the original reinforcing ring 15 is placed on the original supporting surface 1C. The other structure is the same as that of the first embodiment described above, and therefore, the description of the same parts as those of the first embodiment will be omitted. According to the second embodiment described above, even if the thickness (axial dimension) of the reinforcing ring 15 itself is the same as that of the first embodiment, the axial dimension of the annular projection 15A can be increased. That is, in order to prevent interference with a piston or a piston ring (not shown) fitted in the cylinder bore 4, it is not possible to take a long axial dimension of the inner peripheral surface of the reinforcing ring 15, which is substantially the upper end of the cylinder bore 4. Since the annular projection 15A is present on the lower surface on the outer peripheral side, it is possible to obtain a working effect superior to that of the first embodiment described above.

(Third Embodiment) Next, FIG. 6 shows a third embodiment of the present invention. In this third embodiment, an annular recess 1E 'and an annular projection are provided. The position where 15A is provided is moved closer to the cylinder bore 4 than in the second embodiment. That is, the annular recess 1E ′ is provided at an intermediate position between the inner wall surface 5B of the water jacket 5 and the cylinder bore 4. The width (radial dimension) of the annular recess 1E ′ and the width of the annular projection at the adjacent position formed thereby are set to be substantially the same. An annular projection 15A is formed on the lower surface of the reinforcing ring 15 in accordance with the size and arrangement position of the annular recess 1E '. Then, after the adhesive sealant 18 is applied to the annular recess 1E ′ of the support surface 1C, the annular protrusion 15A of the reinforcing ring 15 is applied thereto.
At the same time as engaging with, the lower surface of the reinforcing ring 15 is brought into contact with the support surface 1C. The other structure is the same as that of the second embodiment, and the description of the same parts will be omitted. Even with the configuration of the third embodiment as described above, it is possible to obtain the same effect as that of the second embodiment described above.

------- (Fourth Embodiment) Next, referring to FIG. 7 and FIG.
Shows a fourth embodiment of the present invention. In the fourth embodiment, a plurality of engaging protrusions 1F are formed at predetermined positions in the circumferential direction on the support surface 1C, while a plurality of engaging holes 15B which engage with the engaging protrusions 1F in the reinforcing ring 15 are formed. Is drilled. More specifically, the reinforcing ring 15 is formed to have a horizontally long rectangular cross section, and vertical engaging holes 15B are formed at positions at equal intervals in the circumferential direction of the reinforcing ring 15. On the other hand, on the support surface 1C, a plurality of columnar engagement protrusions 1F are formed in accordance with the size and arrangement position of the engagement holes 15B of the reinforcing ring 15. Then, after applying the adhesive sealant 18 to the supporting surface 1C, the engaging convex portion 1F is engaged with the engaging hole 15B of the reinforcing ring 15, and at the same time, the lower surface of the reinforcing ring 15 is brought into contact with the supporting surface 1C. There is. Therefore, the support surface 1C and the lower surface of the reinforcing ring 15 are joined by the adhesive sealant 18 and the seal between them is maintained. In addition, the upper surface of the reinforcing ring 15 and the engaging protrusion 1
The upper end surface of F is located on the same plane as the upper surface 1A of the original cylinder block 1. The other structure is the same as that of the first embodiment, and the description of the same parts will be omitted. According to the configuration of the fourth embodiment as described above, it is possible to obtain the same effect as that of the first embodiment described above, and it is possible to more firmly connect the reinforcing ring 15 to the support surface 1C. The reinforcing ring 15 may be cast when the cylinder block 1 is cast.

---- (Fifth Embodiment) Next, FIG. 9 shows a fifth embodiment of the present invention. In the second embodiment shown in FIG. 5, the supporting surface 1C having a height lower than the original upper surface 1A of the cylinder block 1 is formed and the annular recess 1E 'is formed therein. 5th shown in 9
In the embodiment, the upper surface 1 of the original cylinder block 1
An annular recess 1E ′ is formed at a position adjacent to the water jacket 5 in A, an adhesive sealant 18 is applied thereto, and then a reinforcing ring 15 having a rectangular cross section is engaged. The width (radial dimension) of the annular recess 1E ′ is set to be equal to or more than half the dimension of the cylinder bore 4 and the inner wall surface 5B of the water jacket 5 which are separated in the radial direction. The size of the reinforcing ring 15 is adjusted to the size of the annular recess 1E ', and the axial size is about twice the thickness. Therefore, when the reinforcing ring 15 is fitted in the annular recess 1E ′, the upper surface of the reinforcing ring 15 is flush with the upper surface 1A of the cylinder block 1,
The outer peripheral surface of the reinforcing ring 15 constitutes a part of the inner wall surface 5 </ b> B of the water jacket 5. According to the configuration of the fifth embodiment as described above, it is possible to obtain the same effect as that of the first embodiment. Moreover, unlike the above-described embodiments, in the fifth embodiment, the reinforcing ring 1
Since the inner peripheral surface of 5 does not form a part of the cylinder bore 4,
The axial dimension of the reinforcing ring 15 can be made long without considering interference with a piston and a piston ring (not shown).

-------- (Seventh Embodiment) FIG. 10 shows a sixth embodiment of the present invention. This sixth embodiment is the first embodiment of FIG. Instead of the annular groove 15A and the annular protrusion 1E in the example, tapered surfaces that engage with each other are formed. That is, the bottom surface of the reinforcing ring 15 is
In the drawing, the first tapered surface 15F is formed so that the height of the end portion on the right side is lower than the height of the end portion on the left side. On the other hand, the support surface 1C of the cylinder block 1 is a second tapered surface whose height on the inner peripheral side (left side) is higher than that on the outer peripheral side (right side). Then, the adhesive sealant 18 is applied to the support surface 1C as the second tapered surface, and then the first tapered surface 15F of the reinforcing ring 15 is engaged therewith. When both members are engaged with each other in this manner, the upper surface 15a of the reinforcing ring 15 is flush with the original upper surface 1A of the cylinder block 1. The other structure is the same as that of the first embodiment, and the description of the same parts will be omitted. In the sixth embodiment, the first tapered surface 15F of the reinforcing ring 15 is formed so as to face the cylinder bore 4 side, and the support surface 1C is formed through the adhesive sealant 18.
(Second tapered surface) is engaged. Therefore, this 6th
Also in the embodiment, it is possible to obtain the same effect as that of the first embodiment.

------- (Seventh Embodiment) FIG. 11 shows a seventh embodiment of the present invention. The seventh embodiment is different from the first embodiment shown in FIG. 3 in that a flange portion 15C extending radially outward is formed at the upper end of the outer peripheral portion of the reinforcing ring 15. In the seventh embodiment, the flange portion 15C covers the entire upper opening 5A of the water jacket 5. Other configurations are the same as those of the first embodiment shown in FIG. Water holes and bolt holes are formed in the flange portion 15C as needed. An annular recess having a shallow bottom may be formed on the upper surface 1A of the cylinder block 1 according to the outer diameter and the thickness of the flange portion 15C. In this case, when the reinforcing ring 15 is attached to the position of the support surface 1C, the flange portion 15C is also engaged with the annular recess. Even with the configuration of the seventh embodiment as described above, it is possible to obtain the same effects as those of the first embodiment described above, and the flange portion 1 is formed by a head bolt or the like (not shown).
It is also possible to fix 5C to the upper surface 1A of the cylinder block 1.

---- (Eighth Embodiment) Next, FIG. 12 shows an eighth embodiment of the present invention, which corresponds to the fifth embodiment shown in FIG. In the embodiment, a flange portion 15C extending radially inward and outward is formed on the upper end of the outer peripheral portion of the reinforcing ring 15, and the flange portion 15C covers the upper surface 1A of the cylinder block 1 including the upper opening 5A of the water jacket 5. It is a thing. In the eighth embodiment, the inner peripheral surface of the flange portion 15C substantially constitutes the upper end portion of the cylinder bore 5. The other structure is the same as that of the fifth embodiment shown in FIG. Water holes and bolt holes are formed in the flange portion 15C as needed. Even with the configuration of the eighth embodiment, it is possible to obtain the same effects as the seventh embodiment.

---- (Ninth Embodiment) FIG. 13 shows a ninth embodiment of the present invention. This ninth embodiment is the seventh embodiment shown in FIG. It is a modification of the embodiment. That is, in the seventh embodiment, the flange portion 1
5C, the through holes 15 are provided at positions radially outward of the water jacket 5 and at circumferentially equally spaced positions.
While forming D, a plurality of engagement holes 1H are formed in the upper surface 1A of the cylinder block 1 in accordance with the positions of the through holes 15D of the flange portion 15C. And the reinforcement ring 1
The pin 16 is fitted over the through hole 15D and the engaging hole 1H in a state where 5 is bonded to the position of the support surface 1C by the adhesive sealant 18. Other configurations are shown in FIG.
This is the same as the seventh embodiment shown in FIG. Even with the configuration of the ninth embodiment, it is possible to obtain the same effects as the seventh embodiment.

(Tenth Embodiment) Next, FIG. 14 shows a tenth embodiment of the present invention. In each of the above-described embodiments, the reinforcing ring 15 is provided above the cylinder bore 4, but in the tenth embodiment, the reinforcing ring 15 is omitted and instead the upper portion of the cylinder bore 4 is provided. The surface 1A is connected to the cylinder head 3 by a plurality of pins 16. That is, the engagement holes 1H are formed at positions on the upper surface 1A of the cylinder block 1 that are radially inward of the water jacket 5 and at equal circumferential intervals. Further, the lower surface 3A of the cylinder head 3 also has the engagement hole 1 on the cylinder block 1 side.
A plurality of engagement holes 3C are formed so as to oppose to the H position, and the cylinder head gasket 2 also has a plurality of through holes 2B on the outer side of the bead portion 2A in accordance with the positions of the engagement holes 1H. Has been drilled. Then, the pin 16 is passed through the through hole 2B of the cylinder head gasket 2, and the pin 16 is inserted into the vertically facing engagement hole 3C and engagement hole 1H.
The upper and lower parts of are fitted together. In the tenth embodiment, the suppression means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4 by the plurality of pins 16, the engagement holes 3C, and the engagement holes 1H.
Are configured. In this way, the engagement holes 3C at the facing position,
By engaging the engagement pin 16 with 1H, it is possible to prevent the upper portion of the cylinder bore 4 from expanding in diameter. Incidentally, in the tenth embodiment, the adhesive sealant 18 is also omitted because the reinforcing ring 15 is omitted. Even with such a configuration of the tenth embodiment, it is possible to obtain the same effect as that of the first embodiment described above.

FIG. 15 shows the eleventh embodiment of the present invention. In this embodiment, the cylinder bore 4 in the cylinder block 1 is shown.
The annular protrusion 1E is formed by making the adjacent portion of the upper end of the above-mentioned part higher than the original upper surface 1A by a predetermined height. On the other hand, an annular recess 3D is formed in the cylinder head 3 at an outer position adjacent to the recess 3B (a boundary between the recess 3B and the lower surface 3A) in conformity with the shape of the annular projection 1E. Further, the combustion chamber hole 11 in the cylinder head gasket 2
The periphery of is formed to have a sectional shape in conformity with the sectional shape of the annular recess 3D of the cylinder head 3, and each of the portions serves as a holding portion 2C. A bead portion 2A is formed on a sandwiching portion 2C which is a horizontal portion on the left side. That is, also in the eleventh embodiment, the reinforcing ring 15 is omitted and the adhesive sealant 18 is omitted. In the eleventh embodiment, the upper portion of the cylinder bore 4 is prevented by the annular projection 1E and the annular recess 3D. The suppressing means 10 for suppressing the diameter expansion is configured. In this embodiment, the cylinder head gasket 2 is placed on the cylinder block 1, and in that state, the annular recess 3 of the cylinder head 3 is placed.
D is engaged with the annular projection 1E of the cylinder block 1, and is placed on the original lower surface 3A on the original upper surface 1A. In this state, the cylinder block 1 and the cylinder head 3 are connected by a connecting bolt. As a result, the entire area of the cylinder head gasket 2 including the holding portion 3E covers the upper surface 1A of the cylinder block 1.
And the lower surface 3A of the cylinder head 3 so that the seal between them can be maintained. In the eleventh embodiment, the annular protrusion 1E is the annular recess 3D.
Since it is engaged with, it is possible to suppress the diameter expansion of the upper portion of the cylinder bore 4. Such a first
Even with the configuration of the first embodiment, it is possible to obtain the same effects as those of the first embodiment described above.

------- (Twelfth Embodiment) Furthermore, FIG.
Shows a twelfth embodiment of the present invention. In this embodiment, a cylinder liner 17 made of cast iron is fitted into the through hole of the cylinder block 1 and the inner peripheral surface of the cylinder liner 17 is a cylinder cylinder bore 4 which is an improvement. That is, on the outer periphery of the upper portion of the cylinder liner 17, a flange portion 17A extending outward in the radial direction is formed. On the other hand, on the upper surface 1A of the cylinder block 1,
The flange portion 1 is provided on the outer side adjacent to the water jacket 5.
The annular recess 1G is formed in conformity with the shape of 7A. Then, the flange portion 17A of the cylinder liner 17 is engaged with the annular recess 1G of the cylinder block 1. At this time, the upper surface of the flange portion 17A is the cylinder block 1
It is on the same plane as the original upper surface 1A. Further, the upper opening 5A of the water jacket 5 has a flange 17A.
I am trying to close it. In this embodiment, the flange portion 17A of the cylinder liner 17 and the annular recess 1G constitute the suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. In this way, the flange portion 17A of the cylinder liner 17 has the annular recess 1G.
By engaging with, it is possible to prevent the upper portion of the cylinder bore 4 from expanding in diameter. Even with such a configuration of the twelfth embodiment, it is possible to obtain the same effect as that of the first embodiment described above.

----------- (Thirteenth Embodiment) Next, referring to FIG.
7 to FIG. 26 show the reinforcing ring 1 on the upper part of the cylinder bore 4.
5, the supporting surface 1C and the reinforcing ring 15 are provided.
7 shows an embodiment of a sealing means for maintaining a seal between the and. That is, FIG. 17 shows the first aspect of the present invention.
3 shows three examples. The upper portion of the cylinder bore 4 has a height lower than the original upper surface 1A by a predetermined dimension, thereby forming a flat support surface 1C continuous in the circumferential direction. The reinforcing ring 15 is configured so that its cross section is a horizontally long rectangle, and the inner diameter of the reinforcing ring 15 is set to be the same as the diameter of the cylinder bore 4. The outer diameter of the reinforcing ring 15 is set so that the outer peripheral surface of the reinforcing ring 15 is flush with the inner wall surface 5B of the water jacket 5 when the reinforcing ring 15 is mounted on the support surface 1C. is doing. That is, the reinforcement ring 1
The inner peripheral surface of 5 substantially constitutes the upper end of the cylinder bore 4, and the outer peripheral surface of the reinforcing ring 15 substantially constitutes the inner wall surface 5B of the water jacket 5. The thickness (axial dimension) of the reinforcing ring 15 is set to a dimension corresponding to the difference in height between the support surface 1C and the original upper surface 1A. Although the upper surface 15a of the reinforcing ring 15 is a flat surface, the lower surface of the reinforcing ring 15 is formed with four concentric annular engaging portions 15G concentrically. The cross-sections of these annular engaging portions 15G are triangular with a downward point, and are set to have the same dimensions.
Then, after the outer peripheral portion of the reinforcing ring 15 is engaged with the positioning step portion 1D (see FIG. 1) of the cylinder block 1 for positioning, the reinforcing ring 15 is strongly pressed downward. . As a result, the annular engagement portion 15G provided on the lower surface of the reinforcing ring 15 is engaged with the flat supporting surface 1C, and the lower surface of the reinforcing ring 15 and the supporting surface 1C are brought into close contact with each other. As a result, the reinforcing ring 15 is fixed on the support surface 1C, and the reinforcing ring 15 constitutes the upper end portion of the cylinder bore 4. Further, by the plurality of annular biting portions 15G,
It constitutes a sealing means for maintaining a seal between the lower surface of the reinforcing ring 15 and the support surface 1C. Further, in this embodiment, the reinforcing ring 15 and the supporting surface 1C constitute the suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. In the connected state shown in FIG. 17, the upper surface of the reinforcing ring 15 is the upper surface 1 of the original cylinder block 1.
The height is slightly higher than A. The bead portion 2A of the cylinder head gasket 2 is in close contact with the upper surface of the reinforcing ring 15. Reinforcement ring 1
The inner peripheral surface of 5 constitutes the upper end of the cylinder bore 4, and the outer peripheral surface of the reinforcing ring 15 is
It is flush with the inner wall surface 5B and constitutes a part of the wall surface 5B. As mentioned above, this first
In the third embodiment, since the reinforcing ring 15 is provided on the support surface 1C, it is possible to obtain the same effect as that of the first embodiment. Further, since the plurality of annular engaging portions 15G provided on the reinforcing ring 15 are engaged with the supporting surface 1C, it is possible to reliably maintain the seal between the lower surface of the reinforcing ring 15 and the supporting surface 1C.

--- (Fourteenth Embodiment) FIG. 18 shows a fourteenth embodiment of the present invention. FIG. 17 above
In the thirteenth embodiment of the present invention, the annular engagement portion 15G of the reinforcing ring 15 is formed on the flat support surface 1C of the cylinder block 1.
The seal between the lower surface of the reinforcing ring 15 and the supporting surface 1C is maintained by being engaged with. On the other hand, in the fourteenth embodiment, the annular biting portion 15G is omitted and the lower surface of the reinforcing ring 15 is a flat surface, and the lower surface of the reinforcing ring 15 and the supporting surface 1C are bonded to each other. It is joined by the sealant 18. That is, in the fourteenth embodiment, the adhesive sealant 18
The reinforcing ring 1 is constituted by the sealing means constituted by
5 and the adhesive sealant 18 constitute a suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. The other structure is the same as that of the 13th embodiment.
In the fourteenth embodiment, since the lower surface of the reinforcing ring 15 and the supporting surface 1C are fixed to each other with the adhesive sealant 18, the lower surface of the reinforcing ring 15 and the cylinder block 1 are fixed as in the thirteenth embodiment. The seal between the support surface 1C can be reliably maintained. Moreover, the manufacturing cost of the reinforcing ring 15 can be reduced by the amount that the annular engagement portion 15G in the thirteenth embodiment is omitted.
In the fourteenth embodiment, the entire area of the lower surface of the reinforcing ring 15 and the supporting surface 1C may be roughened, and they may be joined by the adhesive sealant 18.
In this case, by making the lower surface of the reinforcing ring 15 and the supporting surface 1C rough, the fixing force by the adhesive sealant 18 becomes even stronger.

--- (Fifteenth Embodiment) FIG. 19 shows a fifteenth embodiment of the present invention. In this embodiment, as in FIG. 5, the wide annular groove 1 is formed on the support surface 1C.
While forming E ′, an annular protrusion 15A that can be engaged with the annular groove 1E ′ is formed on the lower surface of the reinforcing ring 15. The width (radial dimension) of the annular groove 1E ′ is equal to that of the support surface 1
The width is set to about half of the width of C (dimension in the radial direction). The adhesive sealant 18 is applied to the lower surface of the reinforcing ring 15 and the annular projection 15A thus configured, and then the annular projection 15A is engaged with the annular groove 1E ′. As a result, the reinforcing ring 15 is securely fixed to the position of the supporting surface 1C, and the lower surface of the reinforcing ring 15 and the supporting surface 1C of the cylinder block are adhered by the adhesive sealant 18.
I try to maintain a seal between. In this embodiment, the sealing means is composed of the adhesive sealant 18, and the suppressing means 10 is composed of the reinforcing ring 15 and the support surface 1C. Even in the fifteenth embodiment having such a configuration, it is possible to obtain the same effects as the thirteenth embodiment.

(Sixteenth Embodiment) FIG. 20 shows a sixteenth embodiment of the present invention. This embodiment is the same as the fifteenth embodiment of FIG. In place of the adhesive sealant 18, two annular elastic seal members 1
9 is used. That is, the elastic seal members 19 having the same thickness are mounted at the inner and outer adjacent positions of the annular groove 1E 'on the support surface 1C, and in this state, the annular protrusion 15A of the reinforcing ring 15 is engaged with the annular groove 1E' from above. At the same time, the two elastic seal members 19 are sandwiched by the lower surface of the reinforcing ring 15B and the supporting surface 1C. These elastic seal members 19 constitute a sealing means for maintaining a seal between the lower surface of the reinforcing ring 15 and the support surface 1C. Other configurations are the same as the above-mentioned 15th.
Same as the embodiment. Even in such a sixteenth embodiment, it is possible to obtain the same effect as that of the fifteenth embodiment.

(Seventeenth Embodiment) Next, FIG. 21 shows a seventeenth embodiment of the present invention. In this embodiment, a single elastic seal member 19 is used instead of the adhesive sealant 18 in the fifteenth embodiment of FIG. That is, the elastic seal member 19 fitted to the width of the annular groove 1E ′ is fitted inside the annular groove 1E ′ of the support surface 1C, and in this state, the annular protrusion of the reinforcing ring 15 is inserted into the annular groove 1E ′ from the upper side. 15A is fitted. As a result, the supporting surface 1C and the lower surface of the reinforcing ring 15 are in contact with each other, and the elastic seal member 19 is strongly sandwiched between the annular groove 1E 'and the lower surface of the annular protrusion 15A. In this embodiment, the elastic sealing member 19 constitutes the sealing means. The other structure is the same as that of the fifteenth embodiment shown in FIG. Even in such a seventeenth embodiment, it is possible to obtain the same effects as the fifteenth embodiment.

(Eighteenth Embodiment) FIG. 22 shows an eighteenth embodiment of the present invention. This embodiment is the same as the seventeenth embodiment shown in FIG.
5, the annular engagement portions 15G that are continuous in the circumferential direction are provided at positions inside and outside the annular protrusion 15A on the lower surface of 5, respectively.
The annular engagement portion 15G is engaged with the support surface 1C. Further, as in the seventeenth embodiment, the elastic seal member 19 is mounted in the annular groove 1E ′,
E'and the lower surface of the annular projection 15A make the elastic seal member 1
9 is sandwiched. In this embodiment, the annular engagement portion 15G and the elastic sealing member 19 constitute a sealing means for maintaining a seal between the lower surface of the reinforcing ring 15 and the support surface 1C. The other structure is the same as that of the 17th embodiment. Even in such an eighteenth embodiment, the same operational effects as those in the seventeenth embodiment can be obtained. In addition, the sealing effect is further improved in the eighteenth embodiment as compared with the seventeenth embodiment due to the provision of the annular engagement portion 15G.

--- (19th Embodiment) FIG. 23 shows a 19th embodiment of the present invention. In this embodiment, an annular recess 1E 'is formed at a position adjacent to the cylinder bore 4 on the support surface 1C, while the reinforcing ring 15 is provided with an annular projection 15A in accordance with the size of the annular recess 1E'. Is forming. Then, on the original lower surface of the reinforcing ring 15 and the lower surface of the annular projection 15A, an annular engagement portion 15G that is continuous in the circumferential direction is formed. The cross section of the annular biting portion 15G is formed in a triangular shape having a sharp lower side. Then, the inner annular engaging portion 15G is engaged with the bottom surface of the annular recess E ′, and the outer annular engaging portion 15G is engaged with the original support surface 1C. Further, the bottom surface of the annular recess 1E 'and the lower surface of the annular projection 15A are brought into contact with each other, and the lower surface of the reinforcing ring 15 is brought into contact with the supporting surface 1C.
In this embodiment, the annular engaging portion 15G constitutes the sealing means. Further, in this embodiment, the reinforcing ring 15, the support surface 1C and the annular recess 1E 'constitute a suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. Also, such a first
Also in the ninth embodiment, it is possible to obtain the same effects as those of the thirteenth embodiment shown in FIG.

--- (Twentieth Embodiment) Next, FIG. 24 shows a twentieth embodiment of the present invention. In this embodiment, the second and third annular engaging portions 15G from the left in the thirteenth embodiment of FIG. 17 are omitted, and instead, annular grooves 15H are formed concentrically on the lower surface of the reinforcing ring 15. In addition, elastic seal members 19 having a circular cross section are mounted in the annular grooves 15H. Other configurations are shown in FIG.
This is the same as the 13th embodiment of No. 7. In the twentieth embodiment, the reinforcing ring 15 is strongly pressed against the flat supporting surface 1C, whereby the annular engaging portion 15G engages with the supporting surface 1C and the original lower surface of the reinforcing ring 15 abuts on the supporting surface 1C. Further, both elastic seal members 19 are adapted to come into close contact with the supporting surface 1C. That is, in this embodiment, the both annular engaging portions 15G and the both elastic seal members 19 constitute the sealing means. Further, the reinforcing ring 15 and the supporting surface 1C constitute the suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. Even with such a structure of the twentieth embodiment, it is possible to obtain the same effect as that of the thirteenth embodiment.

--- (Twenty-first Embodiment) FIG. 25 shows a twenty-first embodiment of the present invention, which is an inner peripheral portion of a cylindrical cylinder liner 17. The present invention is applied to the cylinder block 1 having the cylinder bore 4 constituted by the above. That is, the cylindrical cylinder liner 17 is fitted in the through hole 1J of the cylinder block 1, and the inner peripheral surface thereof is the cylinder bore 4. The upper end of the cylinder liner 17 is located above the supporting surface 1C, and the supporting surface 1C and the cylinder liner 1 are
A reinforcing ring 15 is attached to cover the upper end of 7.
On the lower surface of the reinforcing ring 15, an annular engagement portion 15G that is continuous in the circumferential direction is formed, and it is engaged with the support surface 1C as in FIG. Further, the lower surface of the reinforcing ring 15 is in contact with the supporting surface 1C, and the annular recess 15J provided in the reinforcing ring 15 is engaged with the upper end portion of the cylinder liner 17 without a gap. In the twenty-first embodiment, the annular engagement portion 15G constitutes the sealing means for maintaining the seal between the support surface 1C and the lower surface of the reinforcing ring 15. In addition, the reinforcing ring 15 and the supporting surface 1C
And constitute a suppressing means 10 for suppressing the diameter expansion of the upper portion of the cylinder bore 4. The other structure is the same as that of the thirteenth embodiment shown in FIG. Even in such a twenty-first embodiment, it is possible to obtain the same effect as that of the thirteenth embodiment.

---- (Twenty-second Embodiment) Next, FIG. 26 shows a twenty-second embodiment of the present invention. This embodiment is also based on the premise that a cylindrical cylinder liner 17 is fitted in the through hole 1J of the cylinder block 1 as in the twenty-first embodiment shown in FIG. In this embodiment, the upper end of the cylinder liner 17 is positioned lower than the support surface 1C. Along with this, a tubular portion 15K that matches the thickness of the cylinder liner 17 is formed on the inner peripheral portion of the reinforcing ring 15, and the tubular portion 15K is fitted into the through hole 1J from above and the lower end portion of the tubular portion 15K is formed. Is in contact with the upper end of the cylinder liner 17. The other structure is the same as that of the 21st embodiment. Even in the 22nd embodiment having such a configuration, the same effect as that of the 21st embodiment of FIG. 25 can be obtained. Of course, in each of the embodiments shown in FIGS. 17 and 20 to 26, an adhesive sealant may be applied to the lower surface of the reinforcing ring 15 and the supporting surface 1C.

27 to 29 show the twenty-third and twenty-fourth embodiments of the present invention. In these embodiments, the cooling water passage communicating with the water jacket 5 through the reinforcing ring 15 is shown. 21 is formed. The twenty-third embodiment shown in FIGS. 27 to 28 is one in which the cooling water passage 21 is formed in the third embodiment shown in FIG. That is, the annular communication hole 15L continuous in the circumferential direction is formed inside the reinforcing ring 15, and the annular communication hole 1 is formed.
A plurality of radial holes 1 that continuously open to the outer peripheral surface from 5 L
5M is formed. Then, these annular communication holes 15L
The cooling water passage 21 is constituted by the radial holes 15M. Cooling water in the water jacket 5 circulates in the cooling water passage 21 so that the reinforcing ring 15 and its periphery can be cooled. The other structure is the same as that of the third embodiment shown in FIG. The second configured in this way
According to the third embodiment, it is possible to obtain the same effects as the third embodiment. Further, since the cooling water from the water jacket 5 flows through the cooling water passage 21 of the reinforcing ring 15, it is possible to effectively prevent the reinforcing ring 15 itself from being deformed due to overheating. In addition, this 23rd
In the embodiment, the cooling water passage 21 is constituted by the annular communication hole 15L and the radial hole 15M, but a plurality of slits may be formed instead of the radial hole 15M.

Next, FIG. 29 shows a twenty-fourth embodiment of the present invention, which is the reinforcement ring 1 of FIG.
5, a slit 15L that is continuous in the circumferential direction is formed on the outer peripheral surface of 5, and the cooling water passage 21 is configured by the internal space of the slit 15L. Other configurations are the same as those of the embodiment shown in FIG. Even in such a twenty-fourth embodiment, it is possible to obtain the same effects as the twenty-third embodiment shown in FIG. 27 and 29, the upper surface 15a of the reinforcing ring 15 and the upper surface 1A of the cylinder block 1 are configured to have the same height, but the upper surface of the reinforcing ring 15 is the same. 1
The height of 5a may be higher than the upper surface 1A of the cylinder block 1 by a predetermined amount. With such a configuration, the cylinder head 3 can be assembled when the engine is assembled.
When tightening the cylinder block 1 and the cylinder block 1 with the connecting bolt, the load of the connecting bolt is concentrated around the cylinder bore 4. As a result, it is possible to obtain the effect of improving the sealing performance of the cylinder head gasket 2.

Next, FIGS. 30 to 35 show a different embodiment of the present invention. Although the upper surface 15a of the reinforcing ring 15 is a flat surface in each of the above-described embodiments, the annular groove 15N (15P) is formed on the upper surface of the reinforcing ring 15 in each of the embodiments shown in FIGS.
Is formed. --------- (Twenty-fifth Embodiment) FIG. 30 shows a twenty-fifth embodiment of the present invention, which is an improvement of the third embodiment shown in FIG. is there. That is, the reinforcing ring 1
The upper surface 15a of the cylinder block 5 is the upper surface 1 of the original cylinder block 1.
The height is higher than that of A, and the upper surface 15a further has an annular groove 1 which is continuous in the circumferential direction and has a shallow depth.
5N is formed. The depth of the annular groove 15N is set to about half the amount of bulging of the cylinder head gasket 2 that bulges downward. The width (radial dimension) of the annular groove 15N is set to be substantially the same as the width (radial dimension) of the bead portion 2A. The annular groove 15N of the reinforcing ring 15 formed in this manner is configured such that the bottom surface thereof is higher than the upper surface 1A of the cylinder block 1. In this embodiment, the position where the annular groove 15N is formed is the bead portion 2 on the cylinder head gasket 2 side.
Since it is aligned with the position A, the top of the bead portion 2A and its adjacent portion are housed in the annular groove 15N, and the top of the bead portion 2A abuts the bottom surface of the annular groove 15N. The other structure is the same as that of the third embodiment shown in FIG.

According to the twenty-fifth embodiment constructed as described above, it is possible to obtain the same effects as the third embodiment. In addition, by providing the reinforcing ring 15,
Since the bead portion 2A of the cylinder head gasket 2 does not come into direct contact with the cylinder block 1, it is possible to prevent the cylinder block 1 from being damaged by wear or buckling. Further, the upper surface 15a of the reinforcing ring 15
Is set higher than the position of the upper surface 1A of the cylinder block 1 by a predetermined amount. Therefore, when the cylinder head 3 and the cylinder block 1 are tightened by the connecting bolts at the time of assembling the engine, a load is applied around the cylinder bore 4. As it concentrates, high engine sealing performance can be obtained. Further, since the bead portion 2A of the gasket 2 is housed in the annular groove 15N of the reinforcing ring 15, an excessive load is not applied to the bead portion 2A during engine assembly, and therefore the bead portion 2A is prevented from being damaged. You can Further, the depth of the annular groove 15N is the reinforcing ring 1
Since it can be changed when processing 5, the bead part 2
The amount of deformation of A can be adjusted, and the depth of the annular groove 15N may be set to an optimum value in consideration of the durability and sealing properties of the bead portion 2A. Further, unlike the case of forming a groove directly on the upper surface 1A of the cylinder block 1 as in the conventionally known case, the annular groove 15N can be processed in advance on the reinforcing ring 15, so that the annular groove 15N can be processed with high precision. Therefore, it does not take time and effort during processing.

----------- (Twenty-sixth Embodiment) FIG.
Shows a twenty-sixth embodiment. In this embodiment, a circumferentially continuous slit is formed on the outer peripheral surface of the reinforcing ring 15 of FIG. 30, and the internal space thereof is formed as a cooling water passage 21. It was done. Since the cooling water passage 21 formed of this slit opens in the water jacket 5, the cooling water in the water jacket 5 is
It will be introduced in 1. By providing the cooling water passage 21 including the slits, the reinforcing ring 15 has elasticity in the vertical direction, and the reinforcing ring 15 follows the displacement of the lower surface 3A of the cylinder head 3 and the supporting surface 1C of the cylinder block 1. Is good. The other structure is the same as that of the 25th embodiment shown in FIG. Also in such a twenty-sixth embodiment, the same operational effects as those of the twenty-fifth embodiment shown in FIG. 30 can be obtained. Moreover, due to the elastic deformation of the reinforcing ring 15 and the elastic deformation of the bead portion 2A of the cylinder head gasket 2, it is possible to obtain a sealing property that is further superior to that of the 25th embodiment. Further, since the temperature of the seal portion can be lowered by the cooling water introduced into the cooling water passage 21, the durability reliability of the seal portion can be improved.

-------------- (Twenty-seventh embodiment) Next, referring to FIG.
2 shows a 27th embodiment. This example
In the embodiment shown in FIG. 31, the ring-shaped leaf spring 2 having an S-shaped cross section is provided in the slit forming the cooling water passage 21.
1 is inserted. The other structure is the same as that of the 26th embodiment. With such a configuration, the second
It is possible to obtain more elasticity in the vertical direction than the reinforcing ring 15 of the sixth embodiment. Therefore, the reinforcing ring 15 has improved followability with respect to the displacement of the cylinder head 3 and the cylinder block 1, and the sealability is further improved as compared with the 26th embodiment.

------------- (Twenty-eighth Embodiment) Next, referring to FIG.
Reference numeral 3 shows a twenty-eighth embodiment of the present invention. In this embodiment, a circumferentially continuous flange portion 15C that covers the opening 5A of the water jacket 5 is provided on the upper portion of the reinforcing ring 15, and the outer peripheral portion of the flange portion 15C is the outer wall surface of the water jacket 5. It is in contact with 5C. The upper surface 15a of the reinforcing ring 15 is located above the upper surface 1A of the cylinder block 1 by a predetermined amount, and corresponds to the combustion chamber hole 11 of the cylinder head gasket 2 in the twenty-fifth to twenty-seventh embodiments. The portion to be made contact with the outer peripheral surface of the flange portion 15C of the reinforcing ring 15. In addition, the upper surface 1 of the reinforcing ring 15
An annular groove 15N continuous in the circumferential direction is formed in 5a. The depth of the annular groove 15N of this embodiment is the same as that of the second groove described above.
It is deeper than those of the fifth to twenty-seventh embodiments, and the position of the bottom surface of the annular groove 15N is lower than the position of the upper surface 1A of the cylinder block 1. And
A C ring 23 as a first seal member that is continuous in the circumferential direction is housed in the annular groove 15N.
The upper part of the above is projected above the upper surface 15a and comes into contact with the lower surface 3A of the cylinder head 3. In this embodiment, the lower surface of the reinforcing ring 15 and the support surface 1C of the cylinder block 1 are flat surfaces, and they are joined by an adhesive sealant 18. Further, the outer peripheral surface of the reinforcing ring 15 is not provided with slits or grooves which serve as cooling passages. According to the twenty-eighth embodiment, the strength of the reinforcing ring 15 can be increased more than that of the twenty-fifth to twenty-seventh embodiments. Therefore, the upper portion of the cylinder bore 4 can be more surely prevented from expanding its diameter, and the cylinder block 1 can be prevented from being damaged by wear or buckling. Further, in this embodiment, the C ring 23 is provided in place of the bead portion 2A in the previous three embodiments. It is possible to maintain a good seal. Further, in this embodiment, the annular groove 15N
Is easy to process, the damage of the C ring 23 can be prevented by adjusting the depth thereof, and the optimum sealing property can be obtained. Further, as shown by an imaginary line in the vertical direction in FIG. 33, by forming a vertical through hole in the flange portion 15C of the reinforcing ring 15, the cooling water between the water jacket 5 and the cylinder head 3 is cooled. It is also possible to control the water flow rate.

------------- (Twenty-ninth Embodiment) Next, referring to FIG.
Reference numeral 4 shows a twenty-ninth embodiment of the present invention. In this embodiment, the flange portion 15C in the twenty-eighth embodiment of FIG. 33 is omitted to increase the outer diameter of the reinforcing ring 15, and the second annular groove 15P is formed on the upper surface 15a. Reinforcement ring 1 with increasing outer diameter
The outer peripheral surface of 5 projects to the center position of the water jacket 5 in the width direction. Then, the hole 11 of the cylinder head gasket 2 configured similarly to the 28th embodiment is brought into contact with the outer peripheral surface of the reinforcing ring 15. Top 15
The second annular groove 15P formed in a is the first annular groove 15P.
The depth is shallower than N, and a resin O-ring 24 is inserted into the annular groove 15P. This O-ring 24
The upper part of the above is also projected above the upper surface 15a so as to be in contact with the lower surface 3A of the cylinder head 3. The other structure is the same as that of the 28th embodiment shown in FIG. According to the twenty-ninth embodiment, it is possible to obtain the same effects as the twenty-eighth embodiment. Further, in this embodiment, since the double sealing member is arranged in the radial direction by the C ring 23 and the O ring 24, it is possible to obtain a better sealing property than the 28th embodiment. . Moreover, by adjusting the depths of the annular grooves 15N and 15P, it is possible to prevent the C ring 23 and the O ring 24 from being damaged and obtain an optimum sealing property.

In the twenty-eighth and twenty-ninth embodiments, the lower surface of the reinforcing ring 15 which is a flat surface and the supporting surface 1C are joined by the adhesive sealant 18, but the twenty-fifth embodiment described above. As in the example, the bottom surface of the reinforcing ring 15 and the support surface 1C may be engaged with each other by unevenness. Further, the seal member is not limited to the C ring and the O ring.

-------- (30th embodiment) Next, FIG. 35 shows a 30th embodiment of the present invention. This embodiment corresponds to the annular groove 15 in the 29th embodiment of FIG.
By omitting the N and C rings 23, the upper surface on the outer side of the omitted portion is formed to have a lower height than the inner side. The other structure is the same as that of the twenty-ninth embodiment shown in FIG. In this embodiment, the inner side portion of the upper surface 15a abuts the lower surface 3A of the cylinder head 3 and the annular groove 1
The O-ring 24 attached to the 5P closely contacts the lower surface 3A. According to this structure, although the sealing performance is slightly inferior to that of the 34th embodiment, the second embodiment shown in FIG.
It is possible to obtain the same effect as that of the eighth embodiment.

----------- (31st Embodiment) Next, FIG.
Shows a 31st embodiment of the present invention. In each of the above-described embodiments, the suppressing means 10 having the reinforcing ring 15 or a member in place of the reinforcing ring 15 is provided, but the 31st embodiment shown in FIG. 36 is not limited to providing the suppressing means 10 (reinforcing ring 15). The temperature adjusting means 27 for heating or cooling the upper portion of the cylinder bore 4 is provided. More specifically, the thirty-first embodiment is similar to the thirty-first embodiment in that the reinforcing ring 15 located above the supporting surface 1C in the embodiment shown in FIG.
An annular Peltier element 28 which is continuous in the circumferential direction is embedded in the main body of the above. This Peltier element 28 is a special semiconductor element, and by switching its polarity, the cylinder block 1 and the cylinder head 3 around it can be heated or cooled via the reinforcing ring 15. This Peltier element 28
Thus, the temperature adjusting means 27 for heating or cooling the cylinder block 1 and the cylinder head 3 around the reinforcing ring 15 is constituted. Peltier element 28
The electric wire for use is made to pass through the inside of the flange portion 15C from the main body portion, and the connector 29 connected to this electric wire is connected to a power source (not shown). The reinforcing ring 15 can be heated or cooled by applying a voltage to the Peltier element 28 and switching the polarity when required. The other structure is the same as that of the seventh embodiment shown in FIG.

In the thirty-first embodiment thus constructed, when the engine is warmed up in a situation where the outside air is cold, first, the Peltier element 28 as the temperature adjusting means 27 is used to connect the reinforcing ring 15 and its surroundings. The cylinder block 1 and the cylinder head 3 are heated. In such a heated state, the engine is started and warm-up operation is performed for a required time. In the thirty-first embodiment, the Peltier element 28 as the temperature adjusting means 27 is used.
Since the reinforcing ring 15 and its surroundings are heated by the, the atomization of the fuel in the cylinder bore 4 is efficiently performed and the combustion efficiency is also improved, even though the outside air is cold. Therefore, even if the fuel supply amount into the cylinder bore 4 during the warm-up operation is larger than that during the normal operation, the fuel consumption amount is smaller than that of the conventional engine that does not include the temperature adjusting means 27. Therefore, the fuel efficiency of the engine is improved as compared with the conventional one. Moreover, by maintaining the heating state of the reinforcing ring 15 by the temperature adjusting means 27 in the state where the warm-up operation is changed to the normal operation while the outside air is cold, the inside of the cylinder bore 4 in the region close to the wall surface of the cylinder bore 4 is maintained. Since the atomization of the fuel can be promoted, the combustion efficiency of the fuel can be improved. Therefore, the amount of exhaust gas generated can be suppressed and fuel consumption can be improved as compared with the conventional case.

On the other hand, when the engine is overheated during normal operation, the polarity of the Peltier element 28 as the temperature adjusting means 27 is switched so that the Peltier element 12 cools the reinforcing ring 15 and its surroundings. There is.
By cooling the reinforcing ring 15 and the cylinder block 1 around it in this manner, deterioration of engine oil can be suppressed and deformation of the upper portion of the cylinder bore 4 can be suppressed. Therefore, it is possible to suppress an increase in engine oil consumption. Further, by cooling the reinforcing ring 15 and the cylinder block 1 around the reinforcing ring 15, the occurrence of knocking can be suppressed. Furthermore, in the thirty-first embodiment, the seventh embodiment shown in FIG.
Since the suppression means 10 is provided as in the case of the embodiment, it is needless to say that the same working effect as that of the seventh embodiment can be obtained.
In the thirty-first embodiment, the temperature adjusting means 27
Although the Peltier element 28 is used as the above, the temperature adjusting means 27 is not limited to the Peltier element 28, and other electric cooling means or heating means (for example, a heating wire or the like) may be provided. The 31st embodiment is shown in FIG.
Although the case where the Peltier element 28 is provided in the reinforcing ring 15 in the first embodiment of No. 1 has been described, it goes without saying that the Peltier element may be provided in the reinforcing ring 15 in each of the other embodiments described above.

----------- (32nd Embodiment) Next, referring to FIG.
Shows a 32nd embodiment of the present invention. 1 to 35 described above, the suppressing means 10 having the reinforcing ring 15 or a member replacing the reinforcing ring 15 is provided, but the 32nd embodiment shown in FIG. 37 has the reinforcing ring 15. With the suppression means 10,
The reinforcing ring 15 is also used as a mounting member for various sensors. That is, in FIG. 37, in the cylinder block 1, a cylindrical cylinder liner 17 as a cylinder wall material is fitted in the through hole 1K. The inner peripheral surface of the cylinder liner 17 is a cylinder bore 4, and the piston 37 is slidably fitted therein. The upper end surface of the cylinder liner 17 serves as a support surface 1C, and this support surface 1C is formed in the same sectional shape as that of the 31st embodiment, and the same reinforcing ring 15 as that of the 31st embodiment is attached thereto. Are joined by.
Further, the flange portion 15C of the reinforcing ring 15 completely covers the upper opening 5A of the water jacket 5. In addition, a thin plate-shaped cover 32 that matches the shape of the upper surface of the reinforcing ring 15 is prepared, and the cover 32 is placed on the upper surface of the reinforcing ring 15. Therefore, in this embodiment, the cylinder head gasket 2 is placed on the cover 32.
Is to be placed. In this embodiment, the reinforcing ring 15 and the supporting surface 1C are used to form the cylinder bore 4
The suppressing means 10 for suppressing the diameter expansion of the upper part of the (cylinder liner 17) is configured.

Further, the reinforcing ring 15 has a first position at a predetermined position.
A temperature sensor 33, a second temperature sensor 34, a third temperature sensor 35 and a combustion pressure sensor 36 are attached.
In this embodiment, the cover 32 and the reinforcing ring 15 constitute an attaching means for attaching various sensors. The cover 32 may be omitted. Reinforcement ring 1
A first temperature sensor 33 and a combustion pressure sensor 36 are provided on the inner peripheral side which is the main body portion of 5, and the tip ends of these sensors 33 and 36 are directly exposed to the combustion chamber B. The temperature inside the combustion chamber B can be measured by the first temperature sensor 33, and the pressure of the combustion gas inside the combustion chamber B can be measured by the combustion pressure sensor 36. The second temperature sensor 34 is vertically embedded in the main body of the reinforcing ring 15, and the temperature of the reinforcing ring 15 and the temperature of the upper portion of the cylinder liner 17 (that is, the temperature of the combustion chamber) are measured by the second temperature sensor 34. I am able to do it.

The third temperature sensor 35 includes a reinforcing ring 15
Is attached to the flange portion 15C of the above, and its lower portion is inserted into the cooling water in the water jacket 5. The third temperature sensor 35 can measure the temperature of water flowing through the water jacket 5. The lead wires of each of the sensors 33 to 36 are connected to the external connector 37 via the groove inside and inside the reinforcing ring 15. Since the lead wire is housed in the groove on the upper surface, the lead wire is not crushed between the cover 32 and the upper surface of the reinforcing ring 15. In this embodiment, the adhesive sealant 18 is also applied between the lower surface of the cover 32 and the upper surface of the reinforcing ring 15 to maintain the seal between both members. Further, in this embodiment, as shown in FIG. 37, when the piston 31 reaches the top dead center, the piston ring 38 attached to the outer peripheral portion of the piston 31 does not come into contact with the inner peripheral surface of the reinforcing ring 15. Has become. As a result, the piston ring 38 is attached to the support surface 1
The boundary between C and the bottom surface of the reinforcing ring 15 is prevented from being caught and damaged.

According to the thirty-second embodiment constructed as described above, the sensors 33 to 36 can be attached to the required positions of the reinforcing ring 15 for highly accurate temperature measurement and the like. for that reason,
It is possible to improve fuel efficiency and reduce exhaust gas, and it is possible to improve reliability of measurement data for preventing overheating, knocking, and the like. Further, the sensors 33 to 36 may be assembled to the reinforcing ring 15 and then attached to the cylinder block 1. Therefore, the processing cost can be reduced as compared with the case where the sensor block is mounted on the cylinder block 1, and the sensor mounting operation can be easily performed.

Further, in the thirty-second embodiment, the water temperature in the open type water jacket 5 is measured by the third temperature sensor 35, but the present invention is not limited to this, and the water temperature in the normal water jacket is not limited to this. You may make it measure the water temperature of. Also, this third
In the second embodiment, four sensors 33 to 36 are arranged for one combustion chamber B, but the number of sensors is not limited to this, and the number of sensors may be increased or decreased as necessary.
Regarding the first temperature sensor 33, the combustion chamber B
It is desirable to dispose a plurality of them at evenly spaced positions in the circumferential direction. Further, although the four sensors 33 to 36 are arranged in the same straight line in the 32nd embodiment, the present invention is not limited to this, and the sensors may not necessarily be in the same straight line. This third
According to the second embodiment, it is possible to improve the measurement accuracy of the sensor as compared with the related art, so that it is possible to improve fuel efficiency and reduce exhaust gas, and to prevent overheating and knocking. The reliability of various measurement data can be improved.

Incidentally, the reinforcing ring 1 of the above-mentioned embodiments
In the case where 5 is provided, the cylinder head gasket 2 and the reinforcing ring 15 are provided separately, but the reinforcing ring 15 may be integrally connected to the bottom surface of the cylinder head gasket 2. Further, in order to join the above-mentioned reinforcing ring 15 to the support surface 1C, a method of casting the reinforcing ring 15 at the same time when casting the cylinder block may be used.

[0050]

As described above, according to the present invention, it is possible to obtain an effect that it is possible to prevent the upper portion of the cylinder bore from being unevenly expanded in diameter and the roundness from being deteriorated.

[Brief description of drawings]

FIG. 1 is a plan view of a cylinder block 1 which is an embodiment of the present invention.

FIG. 2 is a plan view of a cylinder head gasket 2 which is an embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view showing a conventional technique.

FIG. 5 is a sectional view showing a second embodiment of the present invention.

FIG. 6 is a sectional view showing a third embodiment of the present invention.

FIG. 7 is a sectional view showing a fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a main part of FIG.

FIG. 9 is a sectional view showing a fifth embodiment of the present invention.

FIG. 10 is a sectional view showing a sixth embodiment of the present invention.

FIG. 11 is a sectional view showing a seventh embodiment of the present invention.

FIG. 12 is a sectional view showing an eighth embodiment of the present invention.

FIG. 13 is a sectional view showing a ninth embodiment of the present invention.

FIG. 14 is a sectional view showing a tenth embodiment of the present invention.

FIG. 15 is a sectional view showing an eleventh embodiment of the present invention.

FIG. 16 is a sectional view showing a twelfth embodiment of the present invention.

FIG. 17 is a sectional view showing a thirteenth embodiment of the present invention.

FIG. 18 is a sectional view showing a fourteenth embodiment of the present invention.

FIG. 19 is a sectional view showing a fifteenth embodiment of the present invention.

FIG. 20 is a sectional view showing a sixteenth embodiment of the present invention.

FIG. 21 is a sectional view showing a seventeenth embodiment of the present invention.

FIG. 22 is a sectional view showing an eighteenth embodiment of the present invention.

FIG. 23 is a sectional view showing a nineteenth embodiment of the present invention.

FIG. 24 is a sectional view showing a twentieth embodiment of the present invention.

FIG. 25 is a sectional view showing a twenty-first embodiment of the present invention.

FIG. 26 is a sectional view showing a twenty-second embodiment of the present invention.

FIG. 27 is a sectional view showing a twenty-third embodiment of the present invention.

28 is a plan view of the main part of FIG. 27. FIG.

FIG. 29 is a sectional view showing a twenty-fourth embodiment of the present invention.

FIG. 30 is a sectional view showing a twenty-fifth embodiment of the present invention.

FIG. 31 is a sectional view showing a twenty-sixth embodiment of the present invention.

FIG. 32 is a sectional view showing a 27th embodiment of the present invention.

FIG. 33 is a sectional view showing a twenty-eighth embodiment of the present invention.

FIG. 34 is a sectional view showing a twenty-ninth embodiment of the present invention.

FIG. 35 is a sectional view showing a thirtieth embodiment of the present invention.

FIG. 36 is a sectional view showing a thirty-first embodiment of the present invention.

FIG. 37 is a sectional view showing a thirty-second embodiment of the present invention.

[Explanation of symbols]

1 Cylinder Block 2 Cylinder Head Gasket 3 Cylinder Head 4 Cylinder Bore 5 Water Jacket 10 Suppression Means 15 Reinforcement Ring

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02F 11/00 F02F 11/00 L (72) Inventor Ryosuke Fujiki 3-65, Midorigaoka, Toyota-shi, Aichi Otoyo (72) Inventor Kenji Uchida 3-65 Midorigaoka, Toyota City, Aichi Prefecture Daitoyo Kogyo Co., Ltd. (72) Inventor, Seiji Omura, 1 Toyota Town, Toyota City, Aichi Prefecture F-term in Toyota Motor Corporation ( Reference) 3G024 AA26 AA36 BA21 BA27 FA01 HA03 HA05 HA07

Claims (10)

[Claims] 1. A cylinder block having a water jacket that surrounds the cylinder bore and opens on the upper surface, a cylinder head connected to the cylinder block, and an intermediate portion between the upper surface of the cylinder block and the lower surface of the cylinder head. In an engine provided with a cylinder head gasket that maintains a seal between them, the upper part of the cylinder bore expands to a position above the cylinder bore in the cylinder block and to a position closer to the cylinder bore than the water jacket. An engine provided with a suppressing means for suppressing the diameter. 2. A support surface which is continuous from the upper part of the cylinder bore and which surrounds the cylinder bore and has a continuous annular shape whose height is lower than the upper surface of the original cylinder block,
The engine according to claim 1, wherein a reinforcing ring that constitutes the suppressing means is attached to the support surface. 3. The reinforcing member according to claim 2, wherein an annular biting portion projecting downward is formed on a lower surface of the reinforcing ring, and the biting portion is bited into the support surface. engine. 4. The engine according to claim 2, wherein the reinforcing ring is provided with a cooling water passage communicating with the water jacket. 5. An annular groove continuous in the circumferential direction is formed on the upper surface of the reinforcing ring, and the annular seal member or the bead portion of the cylinder head gasket is accommodated in the annular groove. Engine described in. 6. The engine according to claim 2, wherein the reinforcing ring is provided with heating / cooling means for heating or cooling the reinforcing ring and its peripheral portion. 7. The engine according to claim 2, wherein the reinforcing ring is also used as a mounting member for mounting a required sensor. 8. The reinforcing ring has a bottom surface provided with an uneven first engaging portion, and a supporting surface having a second engaging portion engaging with the first engaging portion. The engine according to each of claims 2 to 7. 9. The engine according to claim 2, wherein the bottom surface of the reinforcing ring and the supporting surface are joined by an adhesive seal member. 10. The reinforcing ring has a flange portion extending outward in the radial direction, and the opening portion of the water jet is covered by the flange portion. Engine described.