CN213928565U - Heat insulation ring for cylinder sleeve and internal combustion engine - Google Patents

Abstract

The utility model provides a novel heat insulation ring for a cylinder sleeve and an internal combustion engine using the heat insulation ring, wherein a concave part or a groove part for forming an air layer for heat insulation is arranged on the outer peripheral surface of the heat insulation ring; the heat insulating ring (10) for a cylinder liner has an annular member (20), and an internal combustion engine provided with the heat insulating ring (10) for a cylinder liner is provided with a plurality of recesses (40) arranged discretely on the outer peripheral surface (30) of the annular member (20).

Description

Heat insulation ring for cylinder sleeve and internal combustion engine

Technical Field

The utility model relates to a heat insulating ring and internal-combustion engine for cylinder liner.

Background

In order to reduce heat loss of an internal combustion engine, a technique is known in which a heat insulating ring (heat insulating ring) is provided on an inner circumferential surface of a cylinder liner in the vicinity of a combustion chamber side end portion (for example, patent documents 1 and 2). As exemplified in patent documents 1 and 2, in the heat insulating ring of the related art, a groove portion having a square cross-sectional shape in a cross-section perpendicular to the circumferential direction is provided on the outer peripheral surface of the heat insulating ring in order to form a heat insulating air layer. Further, since the space (heat-insulating air layer) surrounded by the inner wall surface of the groove portion and the cylinder liner is filled with a gas (air, combustion gas, or a mixture thereof) having extremely low thermal conductivity, the heat-insulating air layer greatly contributes to the exertion of the heat-insulating property by the heat-insulating ring. Therefore, heat loss of the internal combustion engine can be reduced.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent, examined Japanese patent publication No. 05-12527

Patent document 2: japanese patent, Japanese laid-open No. 2007-32401

However, in the heat insulating rings of the prior art in patent documents 1 and 2, etc., it is not specifically proposed in what form the heat insulating air layer is formed on the outer peripheral surface of the heat insulating ring.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide: a novel heat insulating ring for a cylinder liner, which is provided with a recess or groove portion on the outer peripheral surface thereof for forming a heat insulating air layer, and an internal combustion engine using the same.

The above object is achieved by the following present invention. That is to say that the first and second electrodes,

first the utility model discloses a heat insulating ring for cylinder liner's characterized in that: the annular member has a plurality of recesses arranged discretely on an outer peripheral surface thereof.

Second the utility model discloses a heat insulating ring for cylinder liner's characterized in that: the annular member has a plurality of grooves extending in an axial direction of the annular member on an outer peripheral surface of the annular member.

In one embodiment of the heat insulating ring for a cylinder liner according to the first and second embodiments of the present invention, the carbon deposit scraping ring is preferably used as the heat insulating ring for a cylinder liner.

The utility model discloses an internal-combustion engine's characterized in that: at least comprises a cylinder liner and a first or second heat insulation ring for the cylinder liner; wherein the cylinder liner has a cylindrical member, an inner peripheral surface of the cylindrical member includes a first region near one end side and a second region other than near one end side in an axial direction of the cylindrical member, and an inner diameter of the first region is larger than an inner diameter of the second region; the cylinder liner is fitted in the first region of the cylinder liner with a heat insulating ring.

In an embodiment of the internal combustion engine of the present invention, it is preferable that: the annular member has an inner diameter smaller than an inner diameter of the second region.

In another embodiment of the internal combustion engine of the present invention, the internal combustion engine is preferably a diesel engine.

(effects of utility model)

According to the present invention described above, a novel heat insulating ring for a cylinder liner, in which a concave portion or a groove portion forming a heat insulating air layer is provided on an outer peripheral surface, and an internal combustion engine using the same can be provided.

Drawings

Fig. 1 is a plan view showing an example of the heat insulating ring for a cylinder liner according to the first embodiment of the present invention.

Fig. 2 is a sectional view showing an example of a heat insulating ring for a cylinder liner according to the first embodiment of the present invention and an internal combustion engine of the present invention using the heat insulating ring.

Fig. 3 is a plan view showing another example of a planar shape of a concave portion provided on an outer peripheral surface of the heat insulating ring for a cylinder liner according to the first embodiment of the present invention.

Fig. 4 is a cross-sectional view showing another example of the cross-sectional shape of the concave portion provided on the outer peripheral surface of the heat insulating ring for a cylinder liner according to the first embodiment of the present invention.

Fig. 5 is a plan view showing an example of the heat insulating ring for a cylinder liner according to the second embodiment of the present invention.

Fig. 6 is a sectional view showing an example of a heat insulating ring for a cylinder liner according to a second embodiment of the present invention and an internal combustion engine of the present invention using the heat insulating ring.

Fig. 7 is a plan view showing another example of the heat insulating ring for a cylinder liner according to the second embodiment of the present invention.

Fig. 8 is a sectional view showing an example of a sectional shape of a groove provided on an outer peripheral surface of a heat insulating ring for a cylinder liner according to a second embodiment of the present invention.

Fig. 9 is a sectional view showing an example of an internal combustion engine of the present invention provided with a heat insulating ring for a cylinder liner of the present invention functioning as a carbon deposit scraping ring.

(symbol description)

10. 10A, 10B, 10C: heat insulation ring

12. 12A, 12B, 12C, 12D: heat insulation ring

20: ring-shaped member

30: peripheral surface

40: concave part

40X: corner part

42. 42A, 42B, 42C, 42D1, 42D 2: trough

42X: corner part

60: inner peripheral surface

102: cylinder liner

120: cylindrical member

130: inner peripheral surface

130A: first region

130B: second region

200. 200A, 200B, 200C: internal combustion engine

300: piston

310: top bank

400: carbon (C)

Detailed Description

Fig. 1 to 4 are schematic views showing an example of a heat insulating ring for a cylinder liner (hereinafter, simply referred to as "heat insulating ring") according to a first embodiment.

In fig. 1 to 4 and other drawings, the Y direction is a direction parallel to the axial direction of the heat insulating ring (heat insulating ring) and the cylinder liner (cylinder liner), the X direction perpendicular to the Y direction is a direction parallel to the radial direction of the heat insulating ring and the cylinder liner, and the C direction is a direction parallel to the circumferential direction of the heat insulating ring and the cylinder liner.

Fig. 1 is a plan view showing an example of an insulation ring according to a first embodiment, and specifically, a plan view showing an outer peripheral surface of the insulation ring.

In the heat insulating ring 10 shown in fig. 1, a plurality of circular recesses 40 are discretely arranged on the outer peripheral surface 30 of the annular member 20. Here, in the heat insulating ring 10A (10) shown in fig. 1 (a) and the heat insulating ring 10B (10) shown in fig. 1 (B), the concave portions 40 are arranged in a staggered arrangement, and in the heat insulating ring 10C (10) shown in fig. 1 (C), the concave portions 40 are arranged in a tetragonal arrangement. The concave portions 40 may be arranged in a regular array having a certain regularity as illustrated in fig. 1, or may be arranged in a random array, as long as they are arranged discretely on the outer circumferential surface 30.

From the viewpoints of improving the uniformity of the heat insulating effect of the entire outer peripheral surface 30, easily securing the mechanical strength of the heat insulating ring 10, and the like, it is preferable that the concave portions 40 are arranged on the outer peripheral surface 30 in a regular arrangement rather than in a random arrangement on the outer peripheral surface 30.

In addition, from the viewpoint of easily securing the mechanical strength of the heat insulating ring 10 and easily further improving the heat insulating effect, it is preferable to use: the concave portions 40 are arranged on the outer circumferential surface 30 in a staggered arrangement as illustrated in fig. 1 (a) or 1 (B).

Fig. 2 is a cross-sectional view showing an example of the heat insulating ring of the first embodiment and the internal combustion engine of the present embodiment using the heat insulating ring.

Here, the cross section of the heat insulating ring shown in fig. 2 is an example of a cross section between reference characters a-a of the heat insulating ring 10A shown in fig. 1 (a). In fig. 2, the recess 40 provided on the outer peripheral surface 30 of the heat insulating ring 10A has a square cross-sectional shape.

The internal combustion engine 200A (200) shown in fig. 2 includes at least the heat insulating ring 10A and the cylinder liner 102. Here, the cylinder liner 102 has a cylindrical member 120, and an inner circumferential surface 130 of the cylindrical member 120 includes: a first region 130A near one end side (combustion chamber side) and a second region 130B other than the near one end side in the axial direction Y of the cylindrical member 120. In addition, the inner diameter of the first region 130A is set larger than the inner diameter of the second region 130B. Further, the heat insulating ring 10A is fitted in a portion where the inner peripheral surface 130 of the cylinder liner 102 is partially recessed toward the outer peripheral side, that is, in the first region 130A of the cylinder liner 102.

The planar shape (the opening shape in the outer peripheral surface 30) and the sectional shape of the recess 40 are not limited to the circular shape illustrated in fig. 1 and the square shape illustrated in fig. 2, and may be formed in other shapes. The planar shape and the sectional shape of each recess 40 provided in the outer circumferential surface 30 may be the same or different from each other.

Fig. 3 is a plan view showing another example of the planar shape of the recess 40.

Examples of the planar shape of the recess 40 include: a horizontally long oval shape (fig. 3 (a)) having a long diameter parallel to the circumferential direction C, a vertically long oval shape (fig. 3 (B)) having a long diameter parallel to the axial direction Y, a square shape (fig. 3 (C)), a horizontally long rectangle (fig. 3 (D)) having a long side parallel to the circumferential direction C, a vertically long rectangle (fig. 3 (E)) having a long side parallel to the axial direction Y, or a regular hexagon (fig. 3 (F)).

The planar shapes shown in fig. 3 (a) to (F) are made based on the axial direction Y and the circumferential direction C, but these planar shapes may be inclined with respect to the axial direction Y and the circumferential direction C.

Fig. 4 is a cross-sectional view showing another example of the cross-sectional shape of the recess 40.

Examples of the cross-sectional shape of the recess 40 include: a V-shaped cross-sectional shape (fig. 4 a) formed by only two straight lines and one corner 40X which is an intersection of the two straight lines, a curved cross-sectional shape (fig. 4B) formed by rounding the vicinity of the corner 40X in the cross-sectional shape shown in fig. 4 a, a cross-sectional shape (fig. 4C) formed by only a curved line in an arc shape, a U-shaped cross-sectional shape (fig. 4D), and the like, but it is needless to say that other shapes than the above-described shapes may be appropriately adopted.

Fig. 5 to 8 are schematic views showing an example of the heat insulating ring according to the second embodiment, and in fig. 5 to 7, the direction of arrow Y1 indicates the cylinder head side, and the direction of arrow Y2 indicates the crankcase side.

Fig. 5 is a plan view showing an example of the heat insulating ring according to the second embodiment, specifically, a plan view showing an outer peripheral surface of the heat insulating ring. In the heat insulating ring 12 shown in fig. 5, a plurality of grooves 42 extending in parallel with the axial direction Y are provided in the outer peripheral surface 30 of the annular member 20.

Fig. 6 is a cross-sectional view showing an example of a heat insulating ring according to a second embodiment and an internal combustion engine according to the present embodiment using the heat insulating ring. Here, the cross section of the heat insulating ring shown in fig. 6 is an example of a cross section between the symbols B and B of the heat insulating ring 12A (12) shown in fig. 5 (a).

The internal combustion engine 200B (200) shown in fig. 6 has the same shape and structure as the internal combustion engine 200A except that the heat insulating ring 12A is used instead of the heat insulating ring 10A used in the internal combustion engine 200A shown in fig. 2.

In the heat insulating ring 12A shown in fig. 5 a, the groove 42A (42) is continuously provided so as to communicate with both the cylinder head side and the crankcase side of the heat insulating ring 12A (having an opening portion on both the cylinder head side and the crankcase side). Therefore, as shown in fig. 6, the cylinder head side opening portion of the groove 42A communicates with the cylinder head side.

On the other hand, in the heat insulating ring 12B (12) shown in fig. 5B, the groove 42B (42) is provided continuously so as to communicate with the crankcase side (having an opening portion on the crankcase side) and extend to the vicinity of the cylinder head side end surface of the annular member 20.

In the heat insulating ring 12C (12) shown in fig. 5 (C), the groove 42C (42) is provided continuously from the vicinity of the cylinder head side end surface of the annular member 20 to the vicinity of the crankcase side end surface.

In the example shown in fig. 5, the grooves 42 are arranged at equal intervals in the circumferential direction C, and the widths of the grooves 42 are also the same. However, the arrangement intervals of the grooves 42 in the circumferential direction C may not be equal, and the widths, lengths, and/or depths of the grooves 42 may be different from each other.

Here, the groove 42A, the groove 42B, and the groove 42C are most preferable from the viewpoint of improving the heat insulating effect in the entire outer peripheral surface 30 or improving the uniformity of the heat insulating effect in the axial direction Y, but the groove 42C, the groove 42B, and the groove 42A are most preferable from the viewpoint of the strength of the heat insulating ring 12.

Depending on the type of internal combustion engine 200 or the structure of the cylinder head and the vicinity of the heat insulating ring 12, the following may occur: since the dust which is not otherwise contained such as carbon black generated in the combustion chamber enters the groove 42 and accumulates in the groove 42, the heat insulating effect by the heat insulating ring 12 is deteriorated.

For example, assume that: when the internal combustion engine is a diesel engine and a minute gap is formed between the cylinder head and the heat insulating ring 12 in the internal combustion engine, the heat insulating ring 12A is used. In this case, soot generated in the combustion chamber easily enters the groove 42A from the opening portion of the groove 42A on the cylinder head side and is accumulated in the groove 42A. In this case, the heat insulating effect by the heat insulating ring 12A also gradually deteriorates as the cumulative operating time of the internal combustion engine 200 increases. However, when the heat insulating rings 12B and 12C having the groove 42B or the groove 42C having no opening portion on the cylinder head side are used, such a problem can be avoided extremely easily.

Further, from the viewpoint of the assembling property of the internal combustion engine 200, it is more preferable that the heat insulating ring 12A having the groove 42A or the heat insulating ring 12C having the groove 42C have a line-symmetrical shape with respect to a straight line bisecting the heat insulating ring 12 in the axial direction Y. This is because: in the heat insulating ring 12B, there is a possibility that the following assembly errors occur: when assembling the internal combustion engine 200, the heat insulating ring 12B is attached to the cylinder liner 102 in a state where the cylinder head side (the side where the groove 42B has no opening portion) and the crankcase side (the side where the groove 42B has an opening portion) of the heat insulating ring 12B are reversed.

In the heat insulating ring 12 of the second embodiment, the groove 42 is provided so as to extend parallel to the axial direction Y, and in the present specification, the phrase "the groove 42 extends parallel to the axial direction Y" means not only a case where (1) is completely parallel to the axial direction Y (a case where an angle formed between the axial direction Y and the longitudinal direction of the groove 42 is 0 degree), but also a case where (2) is substantially parallel to the axial direction Y.

In the case of the latter (2), the angle formed between the axial direction Y and the longitudinal direction of the groove 42 is not particularly limited, but is usually 20 degrees or less, preferably 15 degrees or less, and more preferably 10 degrees or less.

As for the planar shape of the groove 42, it is preferable that: as illustrated in fig. 5, the groove width is constant, but a planar shape other than the shape illustrated in fig. 5 may be adopted as appropriate. However, when considering the workability of the groove 42 and the like, it is preferable that: the groove width simply becomes wider or narrower in planar shape as going from one side to the other side in the axial direction Y.

Fig. 7 is a plan view showing another example of the heat insulating ring, specifically, a modification of the heat insulating ring 12A shown in fig. 5 (a).

In the heat insulating ring 12D (12) shown in fig. 7, two types of grooves 42D1(42) and 42D2(42) are provided in the outer peripheral surface 30 instead of the groove 42A shown in fig. 5 (a). Here, in the heat insulating ring 12D, the outer peripheral surface 30 is provided with (1) the groove 42D1 and (2) the groove 42D2 alternately in the circumferential direction C, wherein (1) the groove width of the groove 42D1 is narrowed so as to be a linear function from the crankcase side toward the cylinder head side, and (2) the groove width of the groove 42D2 is widened so as to be a linear function from the crankcase side toward the cylinder head side.

As a further modification, the following may be adopted: in fig. 7, the region in which the grooves 42D1 and 42D2 are provided in the outer circumferential surface 30 is set as a groove 42 non-provided region, and the groove 42 is provided in a region in which the grooves 42D1 and 42D2 are not provided.

Fig. 8 is a cross-sectional view showing an example of a cross-sectional shape of the groove 42, and specifically, shows a cross-section between symbols C and C of the groove 42B shown in fig. 5 (B). However, the sectional shape of the groove 42 shown in fig. 8 may be applied to other grooves 42 than the groove 42B shown in fig. 5 (B).

As shown in fig. 8, examples of the cross-sectional shape of the groove 42 include: a square cross-sectional shape (fig. 8 a), an inverted trapezoidal cross-sectional shape (fig. 8B), a V-shaped cross-sectional shape formed by only two straight lines and one corner 42X at which the two straight lines intersect (fig. 8C), a cross-sectional shape formed by rounding the vicinity of the corner 42X in the cross-sectional shape shown in fig. 8C to form a curved line (fig. 8D), a cross-sectional shape formed by only a curved line in an arc shape (fig. 8E), a U-shaped cross-sectional shape (fig. 8F), and the like, but shapes other than the above-described shapes may be appropriately employed.

The heat insulating ring of the present embodiment may be a combination of the heat insulating ring 10 of the first embodiment and the heat insulating ring 12 of the second embodiment. In this case, the recessed portion 40 and the groove 42 are provided on the outer peripheral surface 30 in a mixed state.

The heat insulating rings 10 and 12 of the present embodiment are members used for the purpose of reducing heat loss of the internal combustion engine, but may be used as members (soot removing rings) used for the purpose of removing soot (carbon) adhering to the top land (top land) of the piston in addition to the purpose.

Fig. 9 is a sectional view showing another example of the internal combustion engine according to the present embodiment, and specifically, a sectional view showing a modification of the internal combustion engine 200A shown in fig. 2. The internal combustion engine 200C (200) shown in fig. 9 has the same shape or structure as the internal combustion engine 200A shown in fig. 2, except for the point that the inner diameter of the heat insulating ring 10A is different.

Here, in the internal combustion engine 200A shown in fig. 2, the inner peripheral surface 60 of the heat insulating ring 10A and the inner peripheral surface (the second region 130B) of the cylinder liner 102 are arranged on the same plane, and therefore, the heat insulating ring 10A does not function as a carbon scraper ring (carbon scraper ring).

On the other hand, in the internal combustion engine 200C shown in fig. 9, the inner peripheral surface 60 of the heat insulating ring 10A slightly protrudes toward the inner peripheral side than the inner peripheral surface (second region 130B) of the cylinder liner 102, and therefore, the heat insulating ring 10A also functions as a soot scraping ring. Therefore, in the internal combustion engine 200C, when the piston 300 disposed in the cylinder liner 102 moves toward the top dead center (top dead center), the carbon 400 adhering to the outer peripheral surface of the top land 310 of the piston 300 is scraped off by the heat insulating ring 10A.

When the heat insulating rings 10, 12 also function as soot scraping rings as exemplified in fig. 9, the inner diameters of the annular members 20 constituting the heat insulating rings 10, 12 are set to: to the extent of not contacting the outer circumferential surface of the top land 310 of the piston 300, is slightly larger than the diameter of the top land 310 and smaller than the inner diameter in the second region 130B of the cylinder liner 102.

On the other hand, when the heat insulating rings 10, 12 do not function as the soot scraping rings, the inner diameters of the annular members 20 constituting the heat insulating rings 10, 12 may be set to: is sufficiently larger than the diameter of the top land 310 and is slightly smaller than the inner diameter in the second region 130B of the cylinder liner 102. Alternatively, the inner diameter of the annular member 20 constituting the heat insulating rings 10 and 12 may be set to: substantially equal to the inner diameter of the cylinder liner 102 in the second region 130B, or greater than the inner diameter of the cylinder liner 102 in the second region 130B.

In the internal combustion engine 200C shown in fig. 9, the heat insulating ring 10 of the first embodiment is used as the soot scraping ring, but it is needless to say that the heat insulating ring 12 of the second embodiment may be used as the soot scraping ring.

The surfaces of the annular members 20 constituting the heat insulating rings 10 and 12 of the present embodiment may be subjected to various surface treatments or formed with various coatings as necessary. For example, a thermal insulation sprayed film formed by thermal insulation spraying treatment, a manganese phosphate film formed by chemical conversion treatment, or the like may be formed on the surface of the annular member 20. These coatings depend on the method of forming the coatings, but may be selectively formed on a part of the surface of the annular member 20 (the outer peripheral surface 30, the inner peripheral surface 60, and the like) or formed so as to cover the entire surface of the annular member 20.

In addition, since the thermal insulation performance of the thermal insulation sprayed film or the manganese phosphate film is generally excellent, it is preferable to form the thermal insulation sprayed film or the manganese phosphate film on at least the outer peripheral surface 30 of the annular member 20 from the viewpoint of improving the thermal insulation performance of the thermal insulation rings 10 and 12.

The heat insulating rings 10 and 12 of the present embodiment can be used for any type of internal combustion engine as long as the internal combustion engine is provided with a cylinder liner to which the heat insulating rings 10 and 12 can be attached. Typical examples of such internal combustion engines include gasoline engines and diesel engines.

In addition, when the heat insulating rings 10, 12 of the present embodiment are used in a diesel engine in which carbon is easily generated in a combustion chamber, the heat insulating ring 10 of the present embodiment is preferably used also as a carbon deposit scraping ring.

The internal combustion engine 200 of the present embodiment may be any type of internal combustion engine, but a gasoline engine or a diesel engine is preferable as a representative internal combustion engine.

The inner circumferential surface 130 of the cylindrical member 120 constituting the cylinder liner 102 may be subjected to various surface treatments or formed with various coatings as necessary. For example, a thermal insulation sprayed film formed by thermal insulation spraying treatment, a manganese phosphate film formed by chemical conversion treatment, or the like may be formed on the inner peripheral surface 130 of the cylindrical member 120. These coatings depend on the method of forming the coatings, but may be selectively formed on a part of the inner circumferential surface 130 (the first region 130A, the second region 130B, and the like) of the cylindrical member 120 or formed so as to cover the entire inner circumferential surface 130.

Further, since the thermal insulation of the thermal insulation sprayed film or the manganese phosphate film is generally excellent, it is preferable to form the thermal insulation sprayed film or the manganese phosphate film at least in the first region 130A from the viewpoint of improving the thermal insulation in the vicinity of the portion where the thermal insulation ring 10 is attached.

Claims (6)

1. A heat insulating ring for a cylinder liner, characterized in that,

has a ring-shaped component,

the annular member has a plurality of recesses disposed in a discrete manner on an outer peripheral surface thereof.

2. A heat insulating ring for a cylinder liner, characterized in that,

has a ring-shaped component,

the outer peripheral surface of the annular member is provided with a plurality of grooves extending in the axial direction of the annular member.

3. The heat insulating ring for a cylinder liner according to claim 1 or 2,

the heat insulation ring for the cylinder sleeve is a carbon deposit scraping ring.

4. An internal combustion engine, characterized in that,

comprising at least a cylinder liner and the heat insulating ring for a cylinder liner according to claim 1 or 2,

wherein the cylinder liner has a cylindrical member, an inner peripheral surface of the cylindrical member includes a first region near one end side and a second region other than the near one end side in an axial direction of the cylindrical member, and an inner diameter of the first region is larger than an inner diameter of the second region,

the cylinder liner is fitted in the first region of the cylinder liner with a heat insulating ring.

5. The internal combustion engine according to claim 4,

the annular member has an inner diameter smaller than an inner diameter of the second region.

6. The internal combustion engine according to claim 4,

the internal combustion engine is a diesel engine.

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