KR20130041911A - Cylinder liner - Google Patents

Abstract

Provided is a cylinder liner capable of reducing the thickness and weight reduction. The cylinder liner 10 provided with the 1st cooling bore 15 which was opened diagonally upward from the outer peripheral surface inwardly, and provided with the 1st peripheral groove 16 in the center part in the plate thickness direction of an upper end surface. The outlet of the said 1st cooling bore 15 was formed in the bottom surface which forms the said 1st circumferential groove 16 so that the planar bore shape may show ellipse shape, an ellipse shape, or circular shape.

Description

Cylinder liner {CYLINDER LINER}

The present invention relates to a cylinder liner applied to an internal combustion engine such as a marine diesel engine.

As a cylinder liner applied to internal combustion engines, such as a marine diesel engine, what is known is provided with the cooling hole (henceforth "cooling bore") provided in the inside (in the wall) with respect to the plane perpendicular | vertical to a cylinder axis ( 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 Figs. 11 and 12, the compressive stress is maximized at the inner circumferential surface, and the tensile stress is maximized at the outer circumferential surface. Moreover, in the cylinder liner disclosed by the said patent document 1, thermal stress becomes high in the periphery of the exit (neck opening) of the cooling bore (drilling hole) located in the uppermost outer peripheral surface. 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 cylinder liner which can reduce thickness and aim at weight reduction.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention employ | adopted the following means.

The cylinder liner according to the first aspect of the present invention includes a plurality of first cooling bores opened obliquely upward from the outer circumferential surface toward the wall, and includes a first peripheral groove in the center portion of the upper end face in the plate thickness direction. It was a cylinder liner, and the exit of the said 1st cooling bore was formed in the bottom face which forms the said 1st peripheral groove so that the planar bore shape may show ellipse shape, an ellipse shape, or circular shape.

According to the cylinder liner which concerns on the said 1st aspect, as shown, for example in FIG. 11, the exit of the 1st cooling bore 15 is a center part in a plate | board thickness direction, ie, the stress 0 (zero) point (compression | compression) It is formed in the place (area) near the point where the stress and the tensile stress do not act, and where the thermal stress smaller than the thermal stress in the uppermost outer peripheral surface acts.

Moreover, the exit of the 1st cooling bore is formed in the bottom face which forms a 1st peripheral groove so that shape may show ellipse shape, an ellipse shape, or circular shape in plan view.

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

The cooling structure of the internal combustion engine which concerns on the 2nd aspect of this invention is provided with the said any one cylinder liner and a plurality of 2nd cooling bores open | released obliquely upward toward the inside of a wall from a lower end surface, and the plate thickness direction of a lower end surface It is a cooling structure of an internal combustion engine provided with the 2nd peripheral groove in the outer periphery part at the same time, and having the cylinder cover which is arrange | positioned on the said cylinder liner and closes the opening located above the said cylinder liner, An inlet was formed in the wall surface or bottom surface which forms the said 2nd peripheral groove.

According to the cooling structure of the internal combustion engine which concerns on the said 2nd aspect, the cooling medium (for example, cooling water) which flowed in into the 1st peripheral groove | channel from the exit of a 1st cooling bore is the convex part shown in FIG. 28 into the second peripheral groove 25 through a gap formed between the wall surface on the outer circumferential side (the wall surface on the inner circumference side forming the peripheral groove 25) and the wall surface on the outer circumference side forming the peripheral groove 16. After the inflow, the inlet of the second cooling bore 24 is introduced into the second cooling bore 24.

As a result, the cooling medium contact forbidden conventionally required to guide the cooling medium flowing out of the outlet of the first cooling bore to the inlet of the second cooling bore can be made unnecessary, so that the junction (connection) of the cylinder liner and the cylinder cover can The constitution of the structure can be simplified.

In addition, since the cooling medium contact can be made unnecessary, the small diameter of the outer diameter at the joining portion (connection portion) of the cylinder liner and the cylinder cover can be reduced, and the weight can be reduced.

In the cooling structure of the internal combustion engine which concerns on the said 2nd aspect, when it coat | covers on the said cylinder liner, in the plate | board thickness direction of the said lower end surface located in the inner peripheral side of the said 1st peripheral groove and the said 2nd peripheral groove. A third peripheral groove is provided in the inner circumference, and the combustion gas flowing between the upper end surface of the cylinder liner and the lower end surface of the cylinder cover and introduced into the third peripheral groove is led to an opening formed in the outer peripheral surface of the cylinder cover. It is more suitable if it is the structure with which the gas discharge passage | path to be formed is formed.

According to the cooling structure of such an internal combustion engine, the relief valve conventionally required in order to relief the gas pressure at the time of abnormal combustion can be made unnecessary, and the structure around a cylinder cover can be simplified.

In the cooling structure of the internal combustion engine which concerns on the said structure, it is further more preferable if the said gas discharge passage is formed so that it may pass around the said 2nd circumferential groove.

According to such a cooling structure of the internal combustion engine, the combustion gas passing through the gas discharge passage is cooled by the cooling medium passing through the second peripheral groove.

Thereby, the temperature of the combustion gas which blows off from the opening formed in the outer peripheral surface of a cylinder cover can be reduced, and the safety | security of the worker (for example, the engineer / engine member of a ship) which works around an internal combustion engine can be ensured. Can be.

In the cooling structure of the internal combustion engine which concerns on the said structure, Comprising: The cover outer cylinder which is provided in the outer peripheral surface of the said cylinder cover, and forms the space for gas discharge between the outer peripheral surface of the said cylinder cover, The said space for gas discharge, It is more suitable if it is formed so that the combustion gas blown out from the outer peripheral surface of the cylinder cover through the gas discharge passage may be guided downward along the outer peripheral surface of the cylinder cover.

According to the cooling structure of such an internal combustion engine, the combustion gas blown out from the opening formed in the outer peripheral surface of the cylinder cover through the gas discharge passage is led downward along the outer peripheral surface of the cylinder cover. That is, the combustion gas which blows off from the opening formed in the outer peripheral surface of a cylinder cover is not blown toward the worker (for example, the engineer / engine member of a ship) which works around an internal combustion engine.

Thereby, the safety of the worker (for example, the engineer and engine member of a ship) which works around an internal combustion engine can be ensured further.

In the cooling structure of the internal combustion engine which concerns on the said structure, when the 4th peripheral groove which accommodates an O-ring along a circumferential direction is formed in the wall surface of the inner peripheral side which forms the said 1st peripheral groove, the said 4th peripheral It is more suitable to form a heat dam engraved toward the lower surface of the cylinder liner along the cylinder axis on the upper surface of the cylinder liner which is an inner circumferential side of the groove and opposes the bottom surface forming the bottom of the third peripheral groove. .

According to the cooling structure of such an internal combustion engine, the heat load of the O-ring accommodated in the 4th peripheral groove | channel by the air layer which stays in a thermal dam is reduced (about 10 degreeC as temperature).

Thereby, damage by the heat of an O-ring can be prevented, long life of an O-ring can be attained, and the maintenance interval of an O-ring can be prolonged.

In the cooling structure of the internal combustion engine which concerns on the said structure, In the lower end surface of the said cylinder cover, The wall surface which forms the inner peripheral surface of the said 2nd circumferential groove, The said lower surface surface continuous to this wall surface, and the said lower surface continuously A third convex portion formed of a wall surface forming an outer circumferential surface of the third peripheral groove, and inserted into a fourth peripheral groove formed on an upper end surface of the cylinder liner located on an inner circumferential side of the first peripheral groove; It is more suitable if the 5th peripheral groove which accommodates an O ring along the circumferential direction is formed in the wall surface of the outer peripheral side which forms 3 convex part.

According to the cooling structure of such an internal combustion engine, the O ring which prevents gas leakage from the fitting surface of a cylinder cover and a cylinder liner is arrange | positioned at the side of the cylinder cover which is lower in temperature than a cylinder liner, and is accommodated in the 5th peripheral groove | channel. The thermal load of is reduced more than that by the above-mentioned thermal dam.

Thereby, damage by the heat of an O-ring can be prevented, long life of an O-ring can be attained, and the maintenance interval of an O-ring can be prolonged.

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

According to the internal combustion engine according to the third aspect, a cylinder liner capable of reducing the thickness and reducing the diameter of the outer diameter and reducing the weight can be provided, so that the entire engine can be reduced in size and weight. .

According to the cylinder liner which concerns on this invention, the thickness can be reduced and weight reduction 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 provided with the cylinder liner which concerns on 1st Embodiment of this invention.
3 is an enlarged view of a main part of FIG. 2.
It is a top view which shows a part of upper surface of the cylinder liner which concerns on 1st Embodiment of this invention.
It is a figure which looked at the upper cooling bore formed in the upper part of the cylinder liner which concerns on 1st Embodiment of this invention from the inside of a cylinder liner.
It is a figure which looked at the upper cooling bore formed in the upper part of the cylinder liner which concerns on 1st Embodiment of this invention from the outer side of a cylinder liner.
FIG. 7 is an enlarged view of the main part of FIG. 2.
It is sectional drawing of the principal part which shows the cooling structure of the internal combustion engine provided with the cylinder liner which concerns on 1st Embodiment of this invention.
FIG. 9 is a cross-sectional view of the IX-IX arrow in FIG. 8.
It is a perspective view of the principal part which shows the cylinder liner which concerns on 1st Embodiment of this invention.
It is a figure for demonstrating the stress acting on the exit of the cooling bore which concerns on a conventional and this invention.
It is a figure for demonstrating the stress acting on the exit of the cooling bore conventionally and this invention.
It is sectional drawing of the principal part which shows the cooling structure of the internal combustion engine provided with the cylinder liner which concerns on 2nd Embodiment of this invention.
FIG. 14 is an enlarged view of a main part of FIG. 13.
It is a top view which shows a part of upper surface of the cylinder liner which concerns on 2nd Embodiment of this invention.

[First Embodiment]

Hereinafter, the cylinder liner which concerns on 1st Embodiment of this invention is demonstrated, referring FIGS.

1 is a perspective view of a cylinder liner according to the present embodiment, FIG. 2 is a cross-sectional view of an essential part showing a cooling structure of an internal combustion engine provided with a cylinder liner according to the present embodiment, and FIG. 3 is an enlarged view of an essential part of FIG. 2. 4 is a plan view showing a part of the upper surface of the cylinder liner according to the present embodiment, and FIG. 5 is a view of the upper cooling bore formed on the upper portion of the cylinder liner according to the present embodiment as viewed from the inside of the cylinder liner, FIG. 6. Fig. 7 is a view of the upper cooling bore formed on the upper part of the cylinder liner according to the present embodiment from the outside of the cylinder liner, Fig. 7 is an enlarged view of the main part of Fig. 2, and Fig. 8 is a cylinder liner according to the present embodiment. Sectional drawing of the principal part which shows the cooling structure of the internal combustion engine provided, FIG. 9: is sectional drawing seen from the IX-IX arrow direction of FIG. 8, FIG. A perspective view of a main part showing a cylinder liner, Fig. 11 and Fig. 12 is a diagram for explaining a stress acting on the outlet of the cooling bores of the prior art and the present invention.

The cylinder liner according to the present invention is 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.

Reference numerals 11 in FIGS. 2, 3, and 7 to 10 are fitted (installed) on the upper outer circumferential surface of the cylinder liner to form the lower water chamber 12 and the upper water chamber 13 between the upper outer circumferential surface of the cylinder liner. It is a liner outer cylinder. The lower chamber 12 and the upper chamber 13 are spaces (water chambers) formed in an annular shape in plan view along the circumferential direction, respectively, and the lower chamber 12 is located below the upper chamber 13, and the upper chamber 13 Is formed above the lower chamber 12.

By the way, the cylinder liner 10 which concerns on this embodiment is provided with the lower cooling bore 14 and the upper cooling bore (first cooling bore) 15.

The lower cooling bore 14 is a straight hole that communicates the lower chamber 12 and the upper chamber 13 when the liner outer cylinder 11 is fitted to the upper outer peripheral surface of the cylinder liner 10, and the peripheral direction is oriented. Thus, a plurality (14 in this embodiment) are formed. The inlet (neck) of the lower cooling bore 14 is formed on the outer circumferential surface of the cylinder liner 10 located below the upper portion of the cylinder liner 10, and the outlet (neck) of the lower cooling bore 14 is a cylinder. It is formed in the outer peripheral surface of the cylinder liner 10 located above the upper part of the liner 10, and the longitudinal axis line (center axis line) of the lower cooling bore 14 inclines with respect to the plane perpendicular | vertical to a cylinder axis.

The upper cooling bore 15 is (first) formed on the upper water chamber 13 and the upper surface (normal surface) of the cylinder liner 10 when the liner outer cylinder 11 is fitted to the upper outer peripheral surface of the cylinder liner 10. It is a linear hole which communicates with the peripheral groove | channel (groove which shows an annular view by the plane formed continuously in the circumferential direction) 16, and is formed in multiple numbers (14 in this embodiment) along the circumferential direction. The inlet (neck) of the upper cooling bore 15 is formed on the outer circumferential surface of the cylinder liner 10 located above the outlet of the cylinder cooling liner 10 and located above the outlet of the lower cooling bore 14. The outlet (neck) of the bore 15 is formed at the bottom of the peripheral groove 16 forming the bottom of the peripheral groove 16, and the longitudinal axis (center axis line) of the upper cooling bore 15 is a cylinder. It is inclined with respect to the plane perpendicular to the axis. In addition, the upper cooling bore 15 has an ellipse shape (or ellipse shape or a circular shape) in the planar view of an outlet (neck) formed on the bottom surface of the peripheral groove 16, and at the same time, an ellipse (or ellipse). The bent joint is bent at least once along the way so that the major axis of the axis is located on the tangent line drawn with respect to the center circle of the peripheral groove 16 passing through the center in the width direction of the peripheral groove 16.

2, 3, 7, and 11, the peripheral grooves 16 have a (approximately) rectangular shape when viewed in cross section, and at the same time, the cylinder liner (from the upper surface of the cylinder liner 10 along the cylinder axis) 10) is a groove engraved (drilled) toward the lower surface (bottom surface), and near the stress 0 (zero) point (the point where neither compressive stress nor tensile stress acts) as shown in FIGS. 11 and 12, Is formed on the outer circumferential side rather than the stress zero point.

In addition, as shown in Figs. 1 to 3, 7 and 8, a peripheral groove 17 for accommodating an O-ring (not shown) is formed in the upper outer peripheral surface of the cylinder liner 10 along the circumferential direction. It is. 2, 3, 7, and 8, an O-ring (not shown) is accommodated along the circumferential direction on the wall surface of the inner circumferential side forming the circumferential groove 16. The periphery groove 18 is formed.

As shown in FIG. 2, FIG. 3, and FIG. 7, the cylinder cover 20 is arrange | positioned on the cylinder liner 10, and the opening located in the upper part of the cylinder liner 10 is blocked (sealed).

Reference numeral 21 in FIGS. 2, 3, and 7 denotes a cover outer cylinder (water-closing prohibited) which is fitted (installed) on the outer circumferential surface of the cylinder cover 20 to form a water chamber 22 between the outer circumferential surface of the cylinder cover 20. to be. The water chamber 22 is a space formed annularly in plan view along the circumferential direction, and is formed in the center portion in the axial direction (length direction) of the cylinder cover 20.

The cylinder cover 20 includes an upper cooling bore 23 and a lower cooling bore (second cooling bore) 24.

The upper cooling bore 23 has a straight hole communicating with the water chamber 22 and the upper (normal) center portion of the cylinder cover 20 when the cover outer cylinder 21 is fitted to the outer circumferential surface of the cylinder cover 20. And a plurality (10 in this embodiment) are formed along the circumferential direction. The inlet (neck) of the upper cooling bore 23 is formed in the wall surface of the upper side (ceiling side) which forms the water chamber 22, and the longitudinal axis (center axis line) of the upper cooling bore 23 is a cylinder shaft. It is inclined with respect to the plane perpendicular to.

The lower cooling bore 24 has a (second) circumferential groove 25 formed in the lower surface (lower surface) of the cylinder cover 20 when the cover outer cylinder 21 is fitted to the outer circumferential surface of the cylinder cover 20, and the water chamber. It is a linear hole which communicates with 22, and is formed in multiple numbers (10 in this embodiment) along the circumferential direction. The inlet (neck) of the lower cooling bore 24 is formed at the bottom of the peripheral groove 25 forming the bottom of the peripheral groove 25, and the outlet (neck) of the lower cooling bore 24 is a water chamber ( It is formed in the wall surface of the lower side (bottom side) which forms 22, and the longitudinal axis line (center axis line) of the lower cooling bore 24 inclines with respect to the plane perpendicular | vertical to a cylinder axis.

As shown in FIG. 2, FIG. 3, and FIG. 7, the peripheral groove 25 shows a U-shape as seen from the cross section, and the upper surface of the cylinder cover 20 along the cylinder axis from the lower surface of the cylinder cover 20. It is a groove engraved (cut out) toward the top surface and formed so as to be located on the outer circumferential side of the peripheral groove 16 when coated on the cylinder liner 10.

Moreover, the peripheral groove 26 which accommodates an O-ring (not shown) is formed in the outer peripheral surface of the cylinder cover 20 along a circumferential direction. In addition, on the inner circumferential side of the peripheral groove 25, a (third) peripheral groove 27 showing a U shape in cross section is formed along the peripheral direction.

Peripheral grooves are formed by the wall surface on the inner circumferential side forming the peripheral groove 25, the lower surface of the cylinder cover 20 continuous to the wall surface, and the wall surface on the outer circumferential side forming the peripheral grooves 27 continuously on the lower surface. The (first) convex portion 28 sandwiched in the (16) is formed. The convex part 28 is a predetermined gap (for example, between the wall surface of the outer peripheral side (wall surface of the inner peripheral side which forms the peripheral groove 25), and the wall surface of the outer peripheral side which forms the peripheral groove 16). 3 mm) is formed, and a predetermined gap is formed between the lower surface (lower surface of the cylinder cover 20) and the lower surface forming the bottom of the peripheral groove 16, and the wall surface (peripheral groove 27) on the inner circumferential side thereof. And a predetermined gap (for example, 0.25 mm) is formed between the wall surface on the outer circumferential side forming the peripheral portion and the wall surface on the outer circumferential side forming the peripheral groove 16, and projects downward along the cylinder axis.

The peripheral groove 25 is formed by the wall surface on the outer circumferential side forming the peripheral groove 16, the upper surface of the cylinder liner 10 continuous to the wall surface, and the outer peripheral surface of the cylinder liner 10 continuous to the upper surface. The (second) convex portion 29 sandwiched therein is formed. The convex part 29 has a predetermined clearance (for example, between the wall surface of the inner peripheral side (wall surface of the outer peripheral side which forms the peripheral groove 16), and the wall surface of the inner peripheral side which forms the peripheral groove 25. 3 mm) is formed, and a predetermined gap is formed between the upper surface (upper surface of the cylinder liner 10) and the lower surface forming the bottom of the peripheral groove 25, and the wall surface (cylindrical liner 10) on the outer circumferential side thereof. And a predetermined gap (for example, 0.45 mm) is formed between the outer circumferential surface of the substrate and the wall surface on the outer circumferential side forming the peripheral groove 25, and projects upward along the cylinder axis.

As shown in FIG. 7, the space 30 for gas discharge is formed in the inner peripheral side of the lower end part of the cover outer cylinder 21 along the circumferential direction, and this space 30 and the surrounding groove 27 discharge gas It communicates with the channel | path 31 through.

The gas discharge passage 31 is formed radially from the center of the cylinder cover 20 toward the outer circumferential surface and at equal intervals (45 degree intervals in this embodiment), and forms the bottom of the peripheral groove 27. The first passage 32 which is opened in the bottom surface and extends in the cylinder cover 20 along the cylinder axis toward the upper surface of the cylinder cover 20, and is opened at the upper end of the first passage 32 and at the same time the cylinder cover 20. The second passage 33 is opened on the outer circumferential surface and extends in the cylinder cover 20 in a direction orthogonal to the cylinder axis.

As shown in FIGS. 8-10, the pipe joint 35 for connecting the cooling water supply pipe 34 (refer FIG. 8 and FIG. 9) to the lower end part of the liner outer cylinder 11 is flange 36 and a bolt. It is connected via 37 (it is installed).

The pipe joint 35 is formed radially from the center of the cylinder cover 20 toward the outer circumferential surface and at equal intervals (90 degree intervals in this embodiment), and one end of the pipe joint 35 has a liner outer cylinder. It is formed in the lower end part of 11, and is inserted in the lower chamber 12 through the through hole 38 which penetrates in the plate thickness direction. Openings 39 each having a rectangular shape (see FIG. 8) are formed at both ends of one end of the pipe joint 35 and viewed from the front opening toward the lower water chamber 12. The cooling water supply pipe 34 and the pipe joint are respectively formed. The cooling water supplied through the 35 is supplied in the circumferential direction along the outer circumferential surface of the cylinder liner 10 through the opening 39.

In addition, one end (front end) side of the pipe joint 35 is closed, and cooling water flows out only from the opening 39. The cooling water supply pipe 34 and the pipe joint 35 may include a flange 40 formed at one end of the cooling water supply pipe 34, a flange 41 and a bolt 42 formed at the other end of the pipe joint 35, It is connected by the nut 43.

On the other hand, as shown in FIG.2, FIG.3, FIG.7, the heat dam 44 is formed in the upper surface of the cylinder liner 10 which opposes the bottom surface which forms the bottom part of the peripheral groove 27. As shown in FIG. The heat dam 44 has a U-shaped view in cross section, and at the same time, a groove (for example, a groove) engraved (cut out) from the upper surface of the cylinder liner 10 toward the lower surface of the cylinder liner 10 along the cylinder axis. U-shaped groove 11mm wide and 26mm deep).

According to the cylinder liner 10 which concerns on this embodiment, as shown, for example in FIG. 11, the exit of the 1st cooling bore 15 is a center part in a plate | board thickness direction, ie, stress 0 (zero). It is formed near a point (a point where neither compressive stress nor tensile stress) acts, and at a place (region) where thermal stress smaller than the thermal stress on the uppermost outer peripheral surface acts.

Moreover, the exit of the 1st cooling bore is formed in the bottom face which forms a 1st peripheral groove so that shape may show ellipse shape, an ellipse shape, or circular shape in plan view.

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

According to the cooling structure of the internal combustion engine provided with the cylinder liner 10 and the cylinder cover 20 which concerns on this embodiment, the cooling water which flowed into the peripheral groove 16 from the exit of the upper cooling bore 15 is a convex part. Flow into the peripheral groove 25 through a gap formed between the wall surface on the outer circumferential side of the 28 (wall surface on the inner circumferential side forming the peripheral groove 25) and the wall surface on the outer circumferential side forming the peripheral groove 16. Thereafter, the inlet of the lower cooling bore 24 is introduced into the lower cooling bore 24.

Thereby, the cooling medium contact forbidden conventionally required to guide the cooling water flowing out from the outlet of the upper cooling bore 15 to the inlet of the lower cooling bore 24 can be made unnecessary, so that the cylinder liner 10 and the cylinder cover The structure in the junction part (connection part) of 20 can be simplified.

In addition, by eliminating the need for cooling medium contact, it is possible to reduce the diameter of the outer diameter at the junction (connection) of the cylinder liner 10 and the cylinder cover 20, and to reduce the weight. .

Moreover, according to the cooling structure of the internal combustion engine provided with the cylinder liner 10 and the cylinder cover 20 which concerns on this embodiment, when it coat | covers on the cylinder liner 10, the peripheral groove 16 and the peripheral groove 25 are Periphery groove 27 is provided in the inner peripheral part in the plate thickness direction of the lower end surface of the cylinder cover 20 located in the inner peripheral side of the cylinder), and the upper end surface of the cylinder liner 10 and the lower end surface of the cylinder cover 20 are provided. Since the gas discharge passage 31 which guides the combustion gas which flowed in into the surrounding groove 27 to the opening (outlet of the 2nd passage 33) formed in the outer peripheral surface of the cylinder cover 20 is formed, In order to relief the gas pressure at the time of abnormal combustion, the relief valve conventionally required can be made unnecessary, and the structure around the cylinder cover 20 can be simplified.

Moreover, according to the cooling structure of the internal combustion engine provided with the cylinder liner 10 and the cylinder cover 20 which concerns on this embodiment, it forms so that the gas discharge passage 31 may pass in the vicinity of the peripheral groove 25. The combustion gas passing through the gas discharge passage 31 is cooled by the cooling water passing through the inner groove 25.

Thereby, the temperature of the combustion gas which blows off from the opening formed in the outer peripheral surface of the cylinder cover 20 can be reduced, and the safety of the worker (for example, engineer, engine member of a ship) which works around an internal combustion engine. Can be secured.

Moreover, according to the cooling structure of the internal combustion engine which further includes the cylinder liner 10 and the cylinder cover 20 which concerns on this embodiment, it fits in the outer peripheral surface of the cylinder cover 20, and it is between the outer peripheral surfaces of the cylinder cover 20. The cover outer cylinder 21 which forms the space 30 for gas discharge | emission, and the space 30 for gas discharge | emission passed through the gas discharge channel | path 31, and ejected from the outer peripheral surface of the cylinder cover 20 The combustion gas is formed so as to be guided downward along the outer circumferential surface of the cylinder cover 20, and the combustion gas ejected from the opening formed in the outer circumferential surface of the cylinder cover 20 through the gas discharge passage 31 is a cylinder cover ( It is directed downward along the outer circumferential surface of 20). That is, the combustion gas which blows off from the opening formed in the outer peripheral surface of the cylinder cover 20 does not blow toward the worker (for example, the engineer / engine member of a ship) which works around an internal combustion engine.

Thereby, the safety of the worker (for example, the engineer and engine member of a ship) which works around an internal combustion engine can be ensured further.

Moreover, according to the cooling structure of the internal combustion engine provided with the cylinder liner 10 and the cylinder cover 20 which concerns on this embodiment, the O-ring along the circumferential direction is formed in the wall surface of the inner peripheral side which forms the circumferential groove 16. In the case where the circumferential groove 18 is formed, the upper surface of the cylinder liner 10 which is an inner circumferential side of the circumferential groove 18 and faces the bottom face forming the bottom of the circumferential groove 27, A heat dam 44 engraved toward the lower surface of the cylinder liner 10 is formed along the cylinder axis, and the heat load of the O-ring accommodated in the peripheral groove 18 by the air layer staying in the heat dam 44 is approximately equal to the temperature. 10 ° C.).

Thereby, damage by the heat of an O-ring can be prevented, long life of an O-ring can be attained, and the maintenance interval of an O-ring can be prolonged.

According to the internal combustion engine provided with the cylinder liner 10 which concerns on this embodiment, or the cooling structure of the internal combustion engine which concerns on this embodiment, thickness can be reduced, the diameter of an outer diameter can be reduced, and weight reduction can be aimed at. Since the cylinder liner is provided, the size and weight of the entire engine can be reduced.

[Second Embodiment]

A cylinder liner according to a second embodiment of the present invention will be described with reference to FIGS. 13 to 15. FIG. 13 is a sectional view of an essential part showing a cooling structure of an internal combustion engine having a cylinder liner according to the present embodiment, FIG. 14 is an enlarged view of an essential part of FIG. 13, and FIG. 15 is a view of a cylinder liner according to this embodiment. It is a top view which shows a part of upper surface.

The (fourth) circumferential groove 51 is formed along the circumferential direction instead of the heat dam 44 in the cylinder liner 50 according to the present embodiment, and the cylinder cover 60 according to the present embodiment 4) The (third) convex portion 61 sandwiched in the peripheral groove 51 is different from the above-described first embodiment in that it is formed along the peripheral direction. Other components are the same as those of the first embodiment described above, and therefore descriptions of those components are omitted here.

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

By the way, in the present embodiment, the peripheral groove 62 corresponding to the peripheral groove 25 described in the first embodiment exhibits a rectangular shape (approximately) in cross section and at the same time, the cylinder from the lower surface of the cylinder cover 60. It is a groove | channel carved (cut off) toward the upper surface (normal surface) of the cylinder cover 60 along an axis, and when it is coat | covered on the cylinder liner 50, it is formed so that it may be located in the inner peripheral side of the peripheral groove 16. As shown in FIG.

In addition, the peripheral groove 63 corresponding to the peripheral groove 27 described in the first embodiment has a rectangular shape (approximately) as seen in cross section, and the cylinder cover 60 along the cylinder axis from the lower surface of the cylinder cover 60. It is a groove | channel carved (cut off) toward the upper surface (normal surface) of (), and when it is coat | covered on the cylinder liner 50, it is formed so that it may be located in the inner peripheral side of the peripheral groove | channel 62.

In addition, in this embodiment, the convex part 28 is the wall surface of the outer peripheral side (wall surface which opposes the wall surface of the inner peripheral side of the convex part 29), and the wall surface of the outer peripheral side which forms the peripheral groove 16. A predetermined gap (for example, 0.25 mm) is formed therebetween, and a predetermined gap is formed between the lower surface (lower surface of the cylinder cover 60) and the lower surface forming the bottom of the peripheral groove 16. It protrudes so that a predetermined clearance gap (for example, 3 mm) may be formed between the wall surface of the inner peripheral side and the wall surface of the inner peripheral side which forms the peripheral groove 16. Moreover, the peripheral groove 26 which accommodates an O-ring (not shown) is formed in the outer peripheral surface of the convex part 28 along a circumferential direction.

In addition, in this embodiment, the wall surface which forms the inner peripheral surface of the peripheral groove 16, the upper surface of the cylinder liner 50 continuous to this wall surface, and the outer peripheral surface of the peripheral groove 51 continuous to this upper surface are formed. By the wall surface, the (third) convex part 52 inserted in the peripheral groove 62 is further formed. The convex part 52 forms the wall surface of the outer peripheral side (wall surface which opposes the wall surface of the inner peripheral side of the convex part 28), and the wall surface of the inner peripheral side which forms the convex part 28 (peripheral groove 62). A predetermined gap (for example, 0.25 mm) is formed between the wall surface on the outer circumferential side, and a predetermined gap is formed between the lower surface (lower surface of the cylinder cover 60) and the lower surface forming the bottom of the peripheral groove 51. Gap is formed, and a predetermined gap (for example, between the wall surface on the inner circumferential side thereof (the wall surface facing the wall surface on the outer circumferential side of the convex portion 61) and the wall surface on the outer circumferential side forming the convex portion 61, for example). , 0.25 mm) is projected upward along the cylinder axis.

The peripheral grooves are formed by the wall surface forming the inner circumferential surface of the peripheral groove 62, the lower surface of the cylinder cover 60 continuous to the wall surface, and the wall surface forming the outer circumferential surface of the peripheral groove 63 successively on the lower surface. The (fourth) convex portion 61 inserted into the 51 is further formed. The convex portion 61 is provided with a predetermined gap (eg, between the wall surface on the outer circumferential side (the wall surface facing the wall surface on the inner circumferential side of the convex portion 29) and the wall surface on the outer circumferential side forming the peripheral groove 16). For example, 0.25 mm) is formed, and a predetermined gap is formed between the lower surface (lower surface of the cylinder cover 60) and the lower surface forming the bottom of the peripheral groove 16, and the wall surface on the inner circumferential side and the surroundings It protrudes so that a predetermined clearance gap (for example, 3 mm) may be formed between the wall surface of the inner peripheral side which forms the groove | channel 16. Moreover, the (5th) peripheral groove 64 which accommodates O-ring (not shown) is formed in the outer peripheral surface of the convex part 61 along a circumferential direction.

According to the cylinder liner 50 which concerns on this embodiment, the O-ring which prevents gas leakage from the fitting surface of the cylinder cover 60 and the cylinder liner 50 has a cylinder cover (lower temperature than the cylinder liner 50 ( The heat load of the O-ring, which is disposed on the side of 60 and accommodated in the peripheral grooves 26 and the peripheral grooves 26 formed on the outer circumferential surface of the convex portion 28, is higher than that of the thermal dam 44 described in the first embodiment. Will be reduced.

Thereby, damage by the heat of an O-ring can be prevented, long life of an O-ring can be attained, and the maintenance interval of an O-ring can be prolonged.

Since the other effect is the same as that of 1st 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: cylinder liner
15: upper cooling bore (first cooling bore)
16: groove around (first)
18: home around (fourth)
20: cylinder cover
21: cover outer cylinder
24: lower cooling bore (second cooling bore)
25: home around (second)
27: home around (third)
30: space for gas discharge
31: gas discharge passage
44: heat dam
50: cylinder liner
51: home around (fourth)
60: cylinder cover
61: (third) convex portion
62: the groove around (second)
63: home around (third)
64: Home around (5th)

Claims (8)

It is a cylinder liner provided with the 1st cooling bore which was opened obliquely upward upward from the outer peripheral surface, and provided with the 1st peripheral groove in the center part in the plate thickness direction of the upper end surface,
The cylinder liner of which the exit of the said 1st cooling bore was formed in the bottom face which forms the said 1st peripheral groove so that shape may show ellipse shape, an ellipse shape, or circular shape in plan view. The cylinder liner of claim 1,
A plurality of second cooling bores opened obliquely upwardly from the lower end face toward the wall; It is a cooling structure of the internal combustion engine provided with the cylinder cover which closes the opening located above the said cylinder liner,
The cooling structure of the internal combustion engine which formed the inlet of the said 2nd cooling bore in the wall surface or bottom surface which forms the said 2nd peripheral groove. The inner peripheral part in the plate | board thickness direction of the lower end surface of the said cylinder cover located in the inner peripheral side of the said 1st peripheral groove and the said 2nd peripheral groove when it coat | covers on the said cylinder liner, The 3rd And a gas discharge passage for guiding the combustion gas introduced between the upper end face of the cylinder liner and the lower end face of the cylinder cover into the third peripheral groove to the opening formed in the outer peripheral surface of the cylinder cover. Formed, cooling structure of the internal combustion engine. The cooling structure of an internal combustion engine according to claim 3, wherein the gas discharge passage is formed so as to pass near the second peripheral groove. The cover outer cylinder of Claim 3 or 4 provided in the outer peripheral surface of the said cylinder cover, and forming the space for gas discharge between the outer peripheral surface of the said cylinder cover, The said gas discharge space is the said gas. A cooling structure of an internal combustion engine, configured to guide a combustion gas ejected from an outer circumferential surface of the cylinder cover downward through a discharge passage along the outer circumferential surface of the cylinder cover. The fourth peripheral groove according to any one of claims 3 to 5, wherein the fourth peripheral groove for accommodating the O-ring along the circumferential direction is formed on the wall surface on the inner circumferential side that forms the first peripheral groove. A heat dam engraved toward the lower end face of the cylinder liner along the cylinder axis is formed on the upper end face of the cylinder liner which is an inner circumferential side of the peripheral groove and opposes the bottom face forming the bottom of the third peripheral groove. , Cooling structure of internal combustion engine. The wall surface which forms the inner peripheral surface of the said 2nd circumferential groove in the lower end surface of the said cylinder cover, the said lower end surface continuous to this wall surface, and it is continuous to this lower end surface in any one of Claims 3-5. And a third convex portion formed by a wall surface forming an outer circumferential surface of the third circumferential groove, and inserted into a fourth circumferential groove formed on an upper end surface of the cylinder liner located on the inner circumferential side of the first circumferential groove. And a fifth circumferential groove for accommodating an O-ring along the circumferential direction is formed in the wall surface on the outer circumferential side forming the third convex portion. The internal combustion engine provided with the cooling structure of the cylinder liner of Claim 1, or the internal combustion engine in any one of Claims 2-7.

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