KR20130029821A - Cooling structure for internal combustion engine - Google Patents

Abstract

A plurality of cylinder liners 20 having a plurality of first cooling bores 30 bored upwardly obliquely from the outer circumferential surface and a plurality of second cooling bores 42 bored upwardly obliquely upward from the outer circumferential surface are provided. And a cooling structure of the internal combustion engine, which is disposed on the cylinder liner 20 and has a cylinder cover 40 that closes an opening located above the cylinder liner 20, the cylinder liner 20 and the cylinder cover 40. ), Which is fitted to both the cylinder liner 20 and the cylinder cover 40, is fitted to the outer circumferential surfaces of the cylinder liner 20 and the cylinder cover 40, and that the cylinder liner 20 and the cylinder cover 40 A cooling water passage 11 is formed between the outer circumferential surface and a ring-shaped reinforcement 10 for suppressing expansion of the cylinder liner 20 radially outward during the internal combustion engine operation. "He said.

Description

COOLING STRUCTURE FOR INTERNAL COMBUSTION ENGINE}

The present invention relates to a cooling structure of an internal combustion engine applied to an internal combustion engine such as a marine diesel engine.

As a cooling structure of an internal combustion engine applied to an internal combustion engine such as a marine diesel engine, a cooling hole (hereinafter referred to as a "cooling bore") inclined with respect to a plane perpendicular to the cylinder axis is provided inside (in the wall). One cylinder liner is known (for example, refer patent document 1).

Japanese Patent Laid-Open No. 5-214933

However, in the cylinder liner disclosed in the patent document 1, as shown in FIG. 13, the compressive stress becomes maximum on the inner circumferential surface, and the tensile stress becomes maximum on the outer circumferential surface. Moreover, in the cylinder liner disclosed by the said patent document 1, the planar view shape in the exit (wood) of the cooling bore (drill hole: drill hole) located in the uppermost outer peripheral surface is shown to FIG. 4 and FIG. 7 of the said patent document 1 As shown, it becomes an ellipse shape and the thermal stress in the exit peripheral part of a cooling bore becomes high. Therefore, in the cylinder liner disclosed in the patent document 1, it was difficult to reduce the thickness and to reduce the weight.

This invention is made | formed in view of the said situation, and an object of this invention is to provide the cooling structure of an internal combustion engine which can reduce the thickness of a cylinder liner and can aim at weight reduction.

In order to solve the above problems, the present invention employs the following means.

The cooling structure of the internal combustion engine which concerns on the 1st aspect of this invention is the cylinder liner provided with the some 1st cooling bore which perforated upward obliquely toward the wall from the outer peripheral surface, and the 2nd perforated upward obliquely toward the wall from the outer peripheral surface A cooling structure of an internal combustion engine including a plurality of cooling bores, and having a cylinder cover disposed on the cylinder liner to close an opening located above the cylinder liner, wherein the joint portion of the cylinder liner and the cylinder cover includes: And a cooling water passage between the cylinder liner and the cylinder cover and fitted to the outer circumferential surfaces of the cylinder liner and the cylinder cover, and forming a coolant passage between the cylinder liner and the outer circumferential surface of the cylinder cover. Swell to the radially outer side of the cylinder liner in The hardware is provided with a reinforcement on the ring to inhibit.

According to the cooling structure of the internal combustion engine which concerns on the said 1st aspect, expansion | extension to the radially outer side of a cylinder liner at the time of internal combustion engine operation is suppressed (restrained) by a reinforcement iron.

As a result, the thickness of the cylinder liner can be reduced, and the outer diameter of the cylinder liner, the cylinder cover, and the reinforcing steel can be reduced in size and weight.

In the cooling structure of the internal combustion engine which concerns on a said 1st aspect, it is more preferable if the outlet of a said 1st cooling bore is formed in the center part in the plate | board thickness direction of the said cylinder liner.

According to the cooling structure of such an internal combustion engine, the exit (wood) of the 1st cooling bore is the center part in the plate | board thickness direction of a cylinder liner, ie, the stress 0 (zero) point (the point where neither compressive stress nor tensile stress acts). In the vicinity, it is also formed in a place (region) where thermal stress smaller than the thermal stress on the uppermost outer peripheral surface acts.

As a result, the thickness of the cylinder liner can be further reduced, and the outer diameter of the cylinder liner, the cylinder cover, and the reinforcing steel can be reduced in size and weight, and the stress concentration at the outlet of the first cooling bore is reduced (reduced). You can.

In the cooling structure of the internal combustion engine which concerns on the said 1st aspect, the exit of the said 1st cooling bore is engraved radially inward from the outer peripheral surface of the upper end of the said cylinder liner which opposes the inner peripheral surface of the lower half of the said reinforcement iron, and forms a peripheral groove. It is more preferable if it is formed in the inclined surface to form.

According to the cooling structure of such an internal combustion engine, the exit of a 1st cooling bore is formed in the inclined surface which forms a circumferential groove so that the planar shape may show the shape near a circular shape.

As a result, the thickness of the cylinder liner can be further reduced, and the outer diameter of the cylinder liner, the cylinder cover, and the reinforcing steel can be reduced in size and weight, and the stress concentration at the outlet of the first cooling bore is further reduced (reduced). Can be done.

In the cooling structure of the internal combustion engine which concerns on a said 1st aspect, it is more preferable that the said 1st cooling bore and the said inclined surface are formed so that the longitudinal axis of a said 1st cooling bore may be orthogonal to the said inclined surface.

According to the cooling structure of such an internal combustion engine, the exit of a 1st cooling bore is formed in the inclined surface which forms a peripheral groove so that the planar shape may show circular shape.

As a result, the thickness of the cylinder liner can be further reduced, and the outer diameter of the cylinder liner, the cylinder cover, and the reinforcing steel can be reduced in size and weight, and the stress concentration at the outlet of the first cooling bore is further reduced (reduced). Can be done.

In the cooling structure of the internal combustion engine which concerns on a said 1st aspect, it is more preferable if the said reinforcement iron is made from the metal material which has a modulus of elasticity larger than the modulus of elasticity which the said cylinder liner and the said cylinder cover have.

According to such a cooling structure of the internal combustion engine, when the internal combustion engine is idle (cold), a (predetermined) clearance is secured between the lower half inner circumferential surface of the reinforcing steel and the outer circumferential surface of the cylinder liner, and the upper circumferential inner circumferential surface of the reinforcing steel and the cylinder cover. The (predetermined) clearance is secured between the outer circumferential surfaces of the internal combustion engine, the inner peripheral surface of the lower half of the reinforcing steel is in contact with the outer circumferential surface of the cylinder liner when the internal combustion engine is in operation (on warm), and the inner circumferential surface of the upper half of the reinforcing steel is in contact with the outer circumferential surface of the cylinder cover. do.

Thereby, the operation of separating the cylinder cover from the reinforcing hardware and the cylinder liner and the reinforcing hardware from the cylinder liner when the internal combustion engine is at rest (cold state) can be made easy, Warm seal) can improve the sealability (of gas and cooling water).

In the cooling structure of the internal combustion engine which concerns on the said 1st aspect, it is more preferable if the said reinforcement iron is comprised so that it may be divided into two parts up and down in the plane containing the joining surface of the said cylinder liner and the said cylinder cover.

According to such a cooling structure of the internal combustion engine, the cylinder cover is immediately after the internal combustion engine is stopped, that is, even in a state where the lower half inner circumferential surface of the reinforcing steel is in contact with the outer circumferential surface of the cylinder liner, and the upper half inner circumferential surface of the reinforcing steel is in contact with the outer circumferential surface of the cylinder cover. And the upper half of the reinforcing hardware can be removed from the cylinder liner and the lower half of the reinforcing hardware.

In addition, since the upper half of the cylinder cover and the reinforcing hardware, the cylinder liner, and the lower half of the reinforcing hardware are divided in the plane including the joining surface of the cylinder liner and the cylinder cover, the lifting height of the piston is increased when the piston is removed. It can be made the same height as before, and the ceiling height of an engine room can be made the same height as before.

A cylinder liner according to a second aspect of the present invention is a cylinder liner provided with a plurality of first cooling bores which are opened obliquely upward from the outer circumferential surface into the wall, and the outlet of the first cooling bore is the plate thickness of the cylinder liner. In the center part in a direction, it is formed in the inclined surface which is engraved toward the radial inside from the outer peripheral surface of the upper end part of the said cylinder liner, and forms a peripheral groove.

According to the cylinder liner which concerns on the said 2nd aspect, the exit of a 1st cooling bore is formed in the inclined surface which forms a circumferential groove so that the planar shape may show the shape near a circular shape.

As a result, the thickness of the cylinder liner can be reduced, and the outer diameter of the cylinder liner can be reduced in size and weight, and the stress concentration at the outlet of the first cooling bore can be alleviated (reduced).

In the cylinder liner according to the second aspect, it is more preferable that the first cooling bore and the inclined surface are formed such that the longitudinal axis of the first cooling bore is perpendicular to the inclined surface.

According to such a cylinder liner, the exit of a 1st cooling bore is formed in the inclined surface which forms a circumferential groove so that the planar shape may show circular shape.

As a result, the thickness of the cylinder liner can be further reduced, the diameter of the cylinder liner can be reduced in size and weight, and the stress concentration at the outlet of the first cooling bore can be further alleviated (reduced).

The internal combustion engine which concerns on the 3rd aspect of this invention is equipped with the cooling structure of any said internal combustion engine, or the said cylinder liner.

According to the internal combustion engine according to the third aspect, it is possible to reduce the size and weight of the entire engine.

According to the present invention, the effect of reducing the thickness of the cylinder liner can be achieved.

1 is a perspective view of a cylinder liner according to a first embodiment of the present invention.
It is sectional drawing of the principal part which shows the cooling structure of the internal combustion engine which concerns on 1st Embodiment of this invention.
FIG. 3 is a III-III arrow diagram of FIG. 2.
4 is an enlarged view of a main part of FIG. 2.
FIG. 5 is a VV arrow diagram of FIG. 4.
FIG. 6: is a figure which looked at the inner peripheral surface of the lower half part of the reinforcement iron which concerns on 2nd Embodiment of this invention from the center side of a reinforcement steel, and is the same view as FIG.
FIG. 7 is a sectional view of an essential part showing the cooling structure of the internal combustion engine according to the third embodiment of the present invention, and is the same view as FIG.
FIG. 8 is a VIII-VIII arrow diagram of FIG. 7.
9 is an enlarged view of a main part of FIG. 7.
10 is an XX arrow diagram of FIG. 9.
FIG. 11 is an XI-XI arrow diagram of FIG. 9.
It is sectional drawing which expands and shows the principal part which shows the cooling structure of the internal combustion engine which concerns on 4th Embodiment of this invention.
It is a figure for demonstrating the stress acting on the exit of the cooling bore conventionally and this invention.

[First Embodiment]

EMBODIMENT OF THE INVENTION Hereinafter, the cylinder liner, cylinder cover, and reinforcement iron which concerns on 1st Embodiment of this invention are demonstrated, referring FIGS.

1 is a perspective view of a cylinder liner according to the present embodiment, FIG. 2 is a sectional view of an essential part showing a cooling structure of an internal combustion engine according to the present embodiment, FIG. 3 is an III-III arrow diagram of FIG. 2, FIG. An enlarged view of the main part, and FIG. 5 is a VV arrow diagram of FIG. 4.

The cylinder liner, cylinder cover, and reinforcing iron according to the present invention are applied to an internal combustion engine such as a marine diesel engine, and a piston (not shown) is disposed therein, and the piston slides along its inner circumferential surface.

As shown in at least one of FIGS. 1 to 5, the reinforcing hardware 10 according to the present embodiment includes the cylinder liner 20 and the cylinder cover at the joint portion of the cylinder liner 20 and the cylinder cover 40. It is fitted to both sides of the 40, and is fitted to the outer circumferential surface of the cylinder liner 20 and the cylinder cover 40, and the cooling water passage (coolant flow path) 11 between the cylinder liner 20 and the outer circumferential surface of the cylinder cover 40 (11). ) And a ring-shaped member (ring type) that suppresses (restrains) expansion of the cylinder liner 20 in the radially outward direction during internal combustion engine operation (when warming up). The cooling water passage 11 is reinforced on the lower half inner circumferential surface 12 of the reinforcing hardware 10 while its longitudinal axis (center axis) is parallel to the cylinder axis (length axis of the cylinder liner 20). The plurality of longitudinal grooves 13 formed at regular intervals along the circumferential direction of the hardware 10 and the inner peripheral surface 14 of the upper half of the reinforcing hardware 10 are orthogonal to the vertical grooves 13, and the reinforcing hardware ( It is formed with one (first) circumferential groove 15 formed along the circumferential direction of 10). The longitudinal grooves 13 are grooves (cut out) that are carved outward from the lower half inner circumferential surface 12 of the reinforcing steel 10 in the radial direction outward, and the circumferential groove 15 is the upper half inner circumferential surface of the reinforcing steel 10. It is a groove (indented) which is carved in radial direction outward from (14).

By the way, the enlarged diameter part (protrusion part) 21 which protrudes toward a radial direction outer side is formed in the upper end part (one end part) of the cylinder liner 20 which concerns on this embodiment along the circumferential direction. The enlarged diameter portion 21 includes a (first) inclined surface 22 whose diameter is gradually (slowly) expanded from the lower end (the other end) side of the cylinder liner 20 toward the upper end (one end), and the cylinder liner 20. (First) side (outer circumferential surface) 23 having a constant outer diameter (approximately) from the lower end side of the upper end side to the upper side (upper surface) 24 formed so as to be parallel to a plane perpendicular to the cylinder axis. It is formed by. And the inclined surface 22 and the side surface 23 are formed continuously, and the side surface 23 and the upper surface 24 are formed continuous.

Moreover, on the radially inner side (inner circumferential side) of the upper surface 24, a (second) side (outer circumferential surface) 25 having a constant outer diameter (approximately) is formed from the lower end side of the cylinder liner 20 toward the upper end side. In the upper side (one end side) of the side surface 25, the (second) inclined surface 26 whose outer diameter gradually shrinks (slowly) from the lower end (the other end) side of the cylinder liner 20 toward the upper end (one end) side. Is formed. The upper surface 24 and the side surface 25 are formed to be continuous, and the side surface 25 and the inclined surface 26 are formed to be continuous.

The cylinder liner 20 is provided with a plurality of (first) cooling bores 30 (14 in this embodiment) along the circumferential direction.

The cooling bore 30 is a linear hole in which the inclined surface 22 and the inclined surface 26 communicate. That is, the inlet (wood) 31 of the cooling bore 30 is formed in the inclined surface 22, and the outlet (wood) 32 of the cooling bore 30 is formed in the inclined surface 26, The longitudinal axis (center axis) of the cooling bore 30 is inclined with respect to the plane perpendicular to the cylinder axis.

As shown in FIG.2, FIG.4, the cylinder cover 40 is arrange | positioned on the cylinder liner 20, and is made so that the opening located above the cylinder liner 20 may be blocked (sealed).

The cylinder cover 40 includes an upper cooling bore 41 and a lower cooling bore (second cooling bore) 42.

The upper cooling bore 41 has an outer circumferential surface of the cylinder cover 40 when a cover outer cylinder (water chamber hardware), not shown, is fitted to the outer circumferential surface of the cylinder cover 40 located above (one side) of the reinforcing steel 10. It is a linear hole which communicates the (1st) water chamber 43 formed in the (2) water chamber 44 formed in the outer peripheral surface of the cylinder cover 40 located above (one side) of this water chamber 43, A plurality is formed along the circumferential direction of the cylinder cover 40.

In addition, the longitudinal axis (center axis line) of the upper cooling bore 41 is inclined with respect to the plane perpendicular to the cylinder axis.

The lower cooling bore 42 is formed on the inner circumferential surface 14 of the upper half of the reinforcing steel 10 when the cover outer cylinder is fitted to the outer circumferential surface of the cylinder cover 40 located above (one side) of the reinforcing steel 10. It is a linear hole which connects the circumferential groove 15 and the water chamber 43 located above (one side) of this circumferential groove 15, and is provided in multiple numbers along the circumferential direction of the cylinder cover 40. As shown in FIG.

In addition, the longitudinal axis (center axis line) of the lower cooling bore 42 is inclined with respect to the plane perpendicular to the cylinder axis.

As shown in FIGS. 1-4, in the radially inner side (inner peripheral side) of the inclined surface 26, the outer diameter gradually expands (slowly) toward the upper end side from the lower end side of the cylinder liner 20 (third) An inclined surface 27 is formed, and a (third) side surface (outer peripheral surface) 28 having a constant outer diameter (approximately) is formed on the upper side (one end side) of the inclined surface 27. The inclined surface 26 and the inclined surface 27 are formed to be continuous, and the inclined surface 27 and the side surface 28 are formed to be continuous. In addition, the inclined surfaces 26 and 27 provide a circumferential groove 29 inscribed (cut out) from the outer circumferential surface of the upper end of the cylinder liner 20 inward in the radial direction along the circumferential direction of the cylinder liner 20. Formed.

In addition, the reinforcing hardware 10 has a lower surface (bottom surface) 16 in contact with the upper surface 24 of the enlarged diameter portion 21 when the internal combustion engine is at rest (cold state), and the lower half inner circumferential surface 12. A (predetermined) clearance is secured between the side surfaces 25 and 28, and a (predetermined) clearance is secured between the upper surface (horizontal surface) 17 opposite the lower surface of the peripheral edge of the cylinder cover 40, The upper half inner circumferential surface 14 is in contact with the outer circumferential surface of the cylinder cover 40, and the lower surface 16 is in contact with the upper surface 24 of the enlarged diameter portion 21 during internal combustion engine operation (when warming up). The lower half inner circumferential surface 12 abuts the side surface 25 and the side surface 28, and a (predetermined) clearance is secured between the upper surface 17 facing the lower surface of the circumferential edge of the cylinder cover 40, and the upper half inner circumferential surface thereof. (14) It is formed so that it may contact the outer peripheral surface of the cylinder cover 40. As shown in FIG.

In addition, the code | symbol 45 in FIG. 2 and FIG. 4 has shown the (third) chamber formed by the lower half inner peripheral surface 12 of the reinforcement steel 10, and the inclined surfaces 26 and 27 of the cylinder liner 20. As shown in FIG.

According to the cooling structure of the internal combustion engine provided with the cylinder liner 20, the cylinder cover 40, and the reinforcing iron 10 which concerns on this embodiment, it is radially outward of the cylinder liner 20 at the time of internal combustion engine operation. Expansion is suppressed (restrained) by the reinforcing hardware 10.

Thereby, the thickness of the cylinder liner 20 can be reduced, and the outer diameter of the cylinder liner 20, the cylinder cover 40, and the reinforcement iron 10 can be reduced in diameter, and weight can be reduced.

Moreover, according to the cooling structure of the internal combustion engine provided with the cylinder liner 20, the cylinder cover 40, and the reinforcement iron 10 which concerns on this embodiment, the outlet 32 of the cooling bore 30 is a cylinder liner ( 20) in the middle of the sheet thickness direction, i.e., near the stress 0 (zero) point (the point where neither compressive stress nor tensile stress acts), and where the thermal stress smaller than the thermal stress on the uppermost outer peripheral surface ( Area).

Thereby, the thickness of the cylinder liner 20 can be further reduced, and the outer diameter of the cylinder liner 20, the cylinder cover 40, and the reinforcing steel 10 can be reduced in size and weight, and the cooling bore 30 The stress concentration at the exit of the can be relaxed (reduced).

Moreover, according to the cooling structure of the internal combustion engine provided with the cylinder liner 20, the cylinder cover 40, and the reinforcement iron 10 which concerns on this embodiment, the exit 32 of the cooling bore 30 is a circumferential groove ( 29 is formed on the inclined surface 26 which forms 29 so that the planar shape may show the shape near a circular shape.

Thereby, the thickness of the cylinder liner 20 can be further reduced, and the outer diameter of the cylinder liner 20, the cylinder cover 40, and the reinforcing steel 10 can be reduced in size and weight, and the cooling bore 30 The stress concentration at the outlet 32 of the can be further relaxed (reduced).

Here, it is more preferable if the cooling bore 30 and the inclined surface 26 are formed so that the longitudinal axis of the cooling bore 30 may be orthogonal to the inclined surface 26.

By doing in this way, the exit 32 of the cooling bore 30 is formed in the inclined surface 26 which forms the circumferential groove 29 so that the planar shape may show circular shape.

Thereby, the thickness of the cylinder liner 20 can be further reduced, and the outer diameter of the cylinder liner 20, the cylinder cover 40, and the reinforcing steel 10 can be reduced in size and weight, and the cooling bore 30 The stress concentration at the outlet 32 of the can be further relaxed (reduced).

Moreover, according to the cooling structure of the internal combustion engine provided with the cylinder liner 20, the cylinder cover 40, and the reinforcement iron 10 which concerns on this embodiment, the lower half part of a reinforcement iron when an internal combustion engine is stopped (cold state). A (predetermined) gap is secured between the inner circumferential surface and the outer circumferential surface of the cylinder liner, and a (predetermined) gap is secured between the inner circumferential surface of the upper half of the reinforcing steel and the outer circumferential surface of the cylinder cover, and reinforcement when operating the internal combustion engine (when warming). A metal material having an elastic modulus greater than the elastic modulus of the cylinder liner 20 and the cylinder cover 40 so that the lower circumferential inner surface of the hardware contacts the outer circumferential surface of the cylinder liner and the upper circumferential inner surface of the reinforcing steel contacts the outer circumferential surface of the cylinder cover. For example, when the cylinder liner 20 and the cylinder cover 40 are made of FC250, the reinforcing hardware 10 is made of S25C or SS400.

Thereby, the operation of separating the cylinder cover from the reinforcing hardware and the cylinder liner and the reinforcing hardware from the cylinder liner when the internal combustion engine is at rest (cold state) can be made easy, Warm seal) can improve the sealability (of gas and cooling water).

FC250 is flake graphite cast iron (gray cast iron) with a tensile strength of 250 N / mm 2 or more, S25C is a general structural carbon steel with a carbon content of 0.25%, and SS400 is a general structural rolled steel with a tensile strength of 400 N / mm 2 or more.

According to the cylinder liner 20 which concerns on this embodiment, the exit 32 of the cooling bore 30 has the inclined surface 26 which forms the circumferential groove 29, and its planar shape is close to circular shape. To be formed.

Thereby, the thickness of the cylinder liner 20 can be reduced, the diameter of the outer diameter of the cylinder liner 20 can be reduced, and the stress concentration at the outlet 32 of the cooling bore 30 can be reduced. I can reduce it.

Here, it is more preferable if the cooling bore 30 and the inclined surface 26 are formed so that the longitudinal axis of the cooling bore 30 may be orthogonal to the inclined surface 26.

By doing in this way, the exit 32 of the cooling bore 30 is formed in the inclined surface 26 which forms the circumferential groove 29 so that the planar shape may show circular shape.

As a result, the thickness of the cylinder liner 20 can be further reduced, and the outer diameter of the cylinder liner 20 can be reduced in size and weight, and stress concentration at the outlet 32 of the cooling bore 30 can be reduced. It can be alleviated further.

According to the internal combustion engine provided with the cylinder liner 20 which concerns on this embodiment, or the cooling structure of the internal combustion engine which concerns on this embodiment, miniaturization and weight reduction of the whole engine can be aimed at.

[Second embodiment]

The cylinder liner, the cylinder cover, and the reinforcing hardware according to the second embodiment of the present invention will be described with reference to FIG. 6.

FIG. 6: is the figure which looked at the inner peripheral surface of the lower half part of the reinforcement steel which concerns on this embodiment from the center side of a reinforcement steel, and is the same view as FIG.

The reinforcing hardware 50 according to the present embodiment is different from the above-described first embodiment in that a vertical groove (inclined groove) 51 is formed instead of the vertical groove 13. Since the other components are the same as those of the first embodiment described above, the description of these components is omitted here.

In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above.

The vertical groove 51 is a groove (engraved) which is inscribed radially outward from the lower half inner circumferential surface 12 of the reinforcing hardware 50, and as shown in FIG. 6, its longitudinal axis (center axis) This is inclined with respect to the plane perpendicular to the cylinder axis, and is provided in plural numbers formed at regular intervals along the circumferential direction of the reinforcing hardware 50.

According to the reinforcement hardware 50 which concerns on this embodiment, the passage length (flow path length) of the longitudinal groove 51 becomes longer than the passage length of the vertical groove 13 of 1st Embodiment mentioned above, and the cylinder liner 20 Since more heat is transmitted to the cooling water flowing through the vertical grooves 51 from, the cooling efficiency of the cylinder liner 20 can be improved.

Since the other effect is the same as that of 1st Embodiment mentioned above, the description is abbreviate | omitted here.

[Third embodiment]

The cylinder liner, the cylinder cover, and the reinforcing hardware according to the third embodiment of the present invention will be described with reference to FIGS. 7 to 11.

FIG. 7 is a cross-sectional view of an essential part showing a cooling structure of the internal combustion engine according to the present embodiment, the same drawing as in FIG. 2, FIG. 8 is an arrow diagram of VIII-VIII in FIG. 7, and FIG. 10 is an XX arrow diagram of FIG. 9, and FIG. 11 is an XI-XI arrow diagram of FIG. 9.

The reinforcing hardware 60 according to the present embodiment is different from the above-described first embodiment in that communication holes 61 are formed in place of the longitudinal grooves 13. Since the other components are the same as those of the first embodiment described above, the description of these components is omitted here.

In addition, the same code | symbol is attached | subjected to the same member as 1st Embodiment mentioned above.

The communication hole 61 is parallel to the circumferential groove 15 on the lower half inner circumferential surface 12 of the reinforcing steel 60 and is formed of one (second) circumferential groove along the circumferential direction of the reinforcing steel 60. It is a linear hole which communicates the 62 and the upper surface 17, and is formed in multiple numbers along the circumferential direction of the reinforcement iron 60. As shown in FIG. In addition, the communication hole 61 is formed at regular intervals along the circumferential direction of the reinforcing hardware 60 while the longitudinal axis (center axis) is inclined with respect to the plane perpendicular to the cylinder axis.

The circumferential groove 62 is a groove (engraved) that is inscribed radially outward from the lower half inner circumferential surface 12 of the reinforcing hardware 60 and has an inner diameter from the lower end side of the cylinder liner 20 toward the upper end side. This is formed by the gradually (slowly) expanding (first) inclined surface 63 and the (second) inclined surface 64 whose inner diameter gradually (slowly) shrinks from the lower end side of the cylinder liner 20 to the upper end side. It is. The inclined surface 63 and the inclined surface 64 are formed to be continuous.

The inlet (wood) 65 of the communication hole 61 is formed in the inclined surface 64, and is inclined to the inclined surfaces 26 and 27 of the cylinder liner 20 and the inclined surfaces 63 and 64 of the reinforcing hardware 60. As a result, the (fourth) water chamber 66 is formed.

Since the effect of the reinforcing iron 60 which concerns on this embodiment is the same as that of the 1st Embodiment mentioned above, the description is abbreviate | omitted here.

[Fourth Embodiment]

The cylinder liner, the cylinder cover, and the reinforcing hardware according to the fourth embodiment of the present invention will be described with reference to FIG. 12.

It is sectional drawing which expands and shows the principal part which shows the cooling structure of the internal combustion engine which concerns on this embodiment.

The reinforcing hardware 70 according to the present embodiment is divided up and down in a plane (horizontal plane) 71 including a joining surface at the outer peripheral edge portion of the cylinder liner 20 and the cylinder cover 90. It differs from the thing of the 1st Embodiment and the 2nd Embodiment mentioned above in that it is comprised so that it may be. Since other components are the same as those of the first and second embodiments described above, the description of these components is omitted here.

In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above and 2nd Embodiment.

The reinforcing hardware 70 according to the present embodiment spans both the cylinder liner 20 and the cylinder cover 90 at the junction of the cylinder liner 20 and the cylinder cover 90, and the cylinder liner 20 and the cylinder. It is fitted to the outer circumferential surface of the cover 90, and forms a cooling water passage (cooling water flow path) 72 between the cylinder liner 20 and the outer circumferential surface of the cylinder cover 90, and at the time of internal combustion engine operation (at warm-up). The upper half 73 and the lower half 74 which are ring-shaped (ring-shaped) members which suppress (constrain) the expansion to the radially outer side of the cylinder liner 20 in the upper part, and are divided into two in the upper and lower parts in the plane 71. Equipped. The cooling water passage 72 has an upper circumferential portion 73 on the inner circumferential surface of the upper half portion 73 while its longitudinal axis (center axis) is inclined with respect to a plane parallel to the cylinder axis or perpendicular to the cylinder axis. On the inner circumferential surface of the lower half portion 74 and the plurality of longitudinal grooves (or inclined grooves) 75 formed at regular intervals along the circumferential direction of the longitudinal axis thereof, the longitudinal axis (center axis) is parallel to the cylinder axis, or It is formed with a plurality of longitudinal grooves (or inclined grooves) 76 formed at regular intervals along the circumferential direction of the lower half portion 74 while being inclined with respect to a plane perpendicular to the cylinder axis. The vertical grooves 75 are grooves (cut out) that are carved (outwardly) radially outward from the inner circumferential surface of the upper half portion 73, and the vertical grooves 76 are carved radially outward from the inner circumferential surface of the lower half portion 74. It's a recessed (excavated) groove.

On the other hand, in the lower end part (one end part) of the cylinder cover 90 which concerns on this embodiment, the recessed part 91 carved in the radial direction inward is formed along the circumferential direction. The recessed part 91 is the (first) side surface (outer peripheral surface) 92 which has a constant outer diameter (approximately) toward the upper end (other end) side from the lower end (one end) side of the cylinder cover 90, and is perpendicular to a cylinder axis. It is formed by the lower surface (cross section) 93 formed so as to be parallel to the phosphorus plane. The side surface 92 and the lower surface 93 are formed to be continuous, and the lower surface 93 and the (second) side surface (outer peripheral surface) 94 are formed to be continuous.

The side surface 92 is provided with one peripheral groove 95 formed along the circumferential direction of the cylinder cover 90 while being parallel to the plane 71. The circumferential groove 95 is a groove (engraved) that is engraved radially inwardly from the side surface 92, and whose outer diameter gradually shrinks (lowerly) from the lower end side of the cylinder cover 90 toward the upper end side. (1st) The inclined surface 96 and the (2nd) inclined surface 97 whose inner diameter gradually expands (slowly) toward the upper end side from the lower end side of the cylinder cover 90 are formed. And the inclined surface 96 and the inclined surface 97 are formed so that it may be continuous. In addition, in this embodiment, the inlet (wood) 98 of the lower cooling bore 42 is formed in the inclined surface 97.

In addition, the reinforcing hardware 70 has a lower surface (bottom surface) 77 of the lower half portion 74 in contact with the upper surface 24 of the enlarged diameter portion 21 when the internal combustion engine is at rest (cold state), and the lower half portion 74 (Predetermined) clearance is secured between the inner circumferential surface of the upper face and the side surface 25 and the side face 28, and the (predetermined) clearance is secured between the inner circumferential surface and the side face 92 of the upper half 73, and the upper half 73 The upper surface 78 of the upper surface 78 is in contact with the lower surface 93 of the recessed portion 91, the lower surface 79 of the upper half portion 73 and the upper surface 80 of the lower half portion 74 are in contact with each other. ), The lower surface 77 of the lower half portion 74 is in contact with the upper surface 24 of the enlarged diameter portion 21, the inner circumferential surface of the lower half portion 74 is in contact with the side surface 25 and the side surface 28, and the upper half portion 73 is disposed. The inner circumferential surface of the upper surface and the side surface 92 are in contact with each other, the upper surface 78 of the upper half portion 73 is in contact with the lower surface 93 of the recessed portion 91, and the upper surface of the lower surface 79 and the lower half portion 74 of the upper half portion 73 ( 80) is formed to contact.

In addition, reference numeral 81 in FIG. 12 denotes a (third) water chamber formed by the inner circumferential surface of the lower half portion 74 and the inclined surfaces 26 and 27 of the cylinder liner 20, and reference numeral 82 in FIG. 12 denotes the upper half portion 73. The inner peripheral surface of the (fourth) water chamber formed by the inclined surfaces 96 and 97 of the cylinder cover 90 is shown.

According to the reinforcing hardware 70 according to the present embodiment, immediately after the internal combustion engine is stopped, that is, the inner circumferential surface of the lower half 74 contacts the outer circumferential surface of the cylinder liner 20, and the inner circumferential surface of the upper half 73 is the cylinder cover 90. The cylinder cover 90 and the upper half 73 can be removed from the cylinder liner 20 and the lower half 74 even in a state of being in contact with the outer circumferential surface of the "

In addition, the cylinder cover 90 and the upper half 73, the cylinder liner 20 and the lower half 74 are to be divided in the plane 71 including the joining surface of the cylinder liner 20 and the cylinder cover 90. Therefore, the lifting height of the piston can be made the same height as before, and the ceiling height of an engine room can be made the same height as before, at the time of extracting a piston.

Since the other effect is the same as that of the 1st Embodiment and 2nd Embodiment mentioned above, the description is abbreviate | omitted here.

In addition, this invention is not limited to embodiment mentioned above, A various change and deformation are possible in the range which does not deviate from the summary of this invention.

10: reinforcement
11: coolant passage
12: inner circumference of the lower half
20: cylinder liner
26: slope
29: circumferential groove
30: (first) cooling bore
32: exit
40: cylinder cover
42: (second) cooling bore
50: reinforcement
60: reinforcement
70: reinforcement
71: flat
72: cooling water passage
90: cylinder cover

Claims (9)

A cylinder liner having a plurality of first cooling bores which are opened obliquely upward from the outer circumferential surface into the wall;
A cooling structure of an internal combustion engine having a plurality of second cooling bores which are opened obliquely upward from the outer circumferential surface into the wall, and disposed on the cylinder liner, and having a cylinder cover blocking an opening located above the cylinder liner. ,
In the joint portion of the cylinder liner and the cylinder cover, the cylinder liner and the cylinder cover are fitted to both of the cylinder liner and the outer peripheral surface of the cylinder cover, the cooling water between the cylinder liner and the outer peripheral surface of the cylinder cover The internal combustion engine cooling structure provided with the ring-shaped reinforcement iron which forms a channel | path and suppresses the expansion of the said cylinder liner to the radially outer side at the time of internal combustion engine operation. The method of claim 1,
The cooling structure of the internal combustion engine in which the exit of the said 1st cooling bore is formed in the center part in the plate thickness direction of the said cylinder liner. The method of claim 2,
And an outlet of the first cooling bore is formed on an inclined surface which is engraved radially inward from an outer circumferential surface of the upper end of the cylinder liner opposite the inner circumferential surface of the lower half of the reinforcement iron to form a circumferential groove. The method of claim 3, wherein
The cooling structure of the internal combustion engine in which the said 1st cooling bore and the said inclined surface are formed so that the longitudinal axis of the said 1st cooling bore may be orthogonal to the said inclined surface. The method according to any one of claims 1 to 4,
Cooling structure of the internal combustion engine in which the said reinforcing iron is made of the metal material which has elasticity modulus larger than the elasticity modulus which the said cylinder liner and the said cylinder cover have. 6. The method according to any one of claims 1 to 5,
Cooling structure of the internal combustion engine which is comprised so that the said reinforcement iron may be divided up and down in the plane containing the joining surface of the said cylinder liner and the said cylinder cover. A cylinder liner having a plurality of first cooling bores which are opened obliquely upward from the outer circumferential surface into the wall,
A cylinder liner having an outlet of the first cooling bore formed on an inclined surface formed in the center portion in the plate thickness direction of the cylinder liner from the outer peripheral surface of the upper end portion of the cylinder liner toward the radially inner side to form a circumferential groove. . The method of claim 7, wherein
And the first cooling bore and the inclined surface are formed such that the longitudinal axis of the first cooling bore is perpendicular to the inclined surface. The internal combustion engine provided with the cooling structure of the internal combustion engine in any one of Claims 1-6, or the cylinder liner of Claim 7 or 8.

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