阅读说明：本技术 水套 (Water jacket ) 是由 江户宏一 于 2021-02-18 设计创作，主要内容包括：本发明提供一种水套,其即使在相邻的气缸间设置连接冷却通路的缝隙,也能够缓和在气缸体产生的应力。水套(4)在形成有多个气缸的气缸体(1)中具备：冷却通路(4c),其形成为位于气缸的外侧,供冷却介质流动；以及冷却槽,其形成在相邻的气缸之间,供冷却介质流动。在缝隙端部(5b)的气缸排列方向的剖视图中,缝隙端部(5b)与气缸体内壁(4a)经由倾斜部(6)而连续,倾斜部(6)以随着朝向气缸体内壁(4a)而变厚的方式倾斜。(The invention provides a water jacket, which can relax the stress generated in a cylinder block even if a gap for connecting a cooling passage is arranged between adjacent cylinders. A water jacket (4) is provided with, in a cylinder block (1) in which a plurality of cylinders are formed: a cooling passage (4c) which is formed outside the cylinder and through which a cooling medium flows; and a cooling groove formed between the adjacent cylinders for flowing a cooling medium. In a cross-sectional view of the gap end (5b) in the direction of the cylinder arrangement, the gap end (5b) and the cylinder block inner wall (4a) are continuous via an inclined portion (6), and the inclined portion (6) is inclined so as to become thicker toward the cylinder block inner wall (4 a).)

1. A water jacket, which is provided in a cylinder block in which a plurality of cylinders are formed, is provided with:

a cooling passage formed outside the cylinder and through which a cooling medium flows; and

a cooling groove formed between adjacent cylinders for a cooling medium to flow,

the water jacket is characterized in that,

in a cross-sectional view of the end portion of the cooling groove in the cylinder arrangement direction, the end portion of the cooling groove and the inner wall of the cooling passage are continuous via an inclined portion that is inclined so as to become thicker toward the inner wall of the cooling passage.

2. The water jacket according to claim 1,

the adjacent cylinders are connected through the following parts: 1 st curved side surface extending from the side wall side of one cylinder in a curved manner; a flat wall surface extending from a side edge of the 1 st curved side surface toward the other cylinder and parallel to the cylinder arrangement direction; and a 2 nd curved side surface curved to extend from the flat wall surface toward the other cylinder,

the cooling groove is provided in the flat wall surface.

3. A water jacket, which is provided in a cylinder block in which a plurality of cylinders are formed, is provided with:

a cooling passage formed outside the cylinder and through which a cooling medium flows; and

a cooling groove formed between adjacent cylinders for a cooling medium to flow,

the water jacket is characterized in that,

the adjacent cylinders are connected through the following parts: 1 st curved side surface extending from the side wall side of one cylinder in a curved manner; a flat wall surface extending from a side edge of the 1 st curved side surface toward the other cylinder and parallel to the cylinder arrangement direction; and a 2 nd curved side surface curved to extend from the flat wall surface toward the other cylinder,

the cooling groove is provided in the flat wall surface.

Technical Field

The present invention relates to a water jacket of a cylinder block of an internal combustion engine.

Background

Conventionally, the following water jackets are known: in a cylinder block in which cylinder heads are arranged in an overlapping manner, a plurality of cylinder barrels are formed in the axial direction of a crankshaft, a cooling passage that opens toward the cylinder heads is formed so as to surround a group of the cylinder barrels, a portion of the cooling passage located between adjacent cylinder barrels serves as a thrust portion that enters the side of a cylinder row center line that connects the centers of the cylinder barrels, the thrust portion is composed of a deep groove portion located on a side away from the cylinder row center line and having substantially the same depth as other portions, and a shallow groove portion located on a side close to the cylinder row center line and having a shallow depth, the shallow groove portion is formed in the cylinder block, a gasket for flow rate adjustment is fitted into the cooling passage, a restriction portion that restricts the flow of a coolant so that the coolant mainly passes through the shallow groove portion is formed in a portion of the gasket that fits into the thrust portion of the cooling passage (for example, see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5964092

Disclosure of Invention

Problems to be solved by the invention

In order to improve the cooling performance of the cylinder block, it is considered to provide a gap extending perpendicular to the arrangement direction of the cylinders between the adjacent cylinders.

However, if the cooling performance is improved by providing a gap between the adjacent cylinders, a temperature difference between each portion in the cylinder block becomes large, and thus thermal stress is generated.

Further, if a gap is provided between adjacent cylinders, the cylinders are heated to expand, and thus a compressive stress is generated in the gap against the expansion, and stress concentration occurs.

In view of the above-described problems, an object of the present invention is to provide a water jacket that can alleviate stress generated in a cylinder block even when a gap connecting cooling passages is provided between adjacent cylinders.

Means for solving the problems

[1] In order to achieve the above object, a water jacket (e.g., water jacket 4 of the embodiment) of the present invention is provided in a cylinder block (e.g., cylinder block 1 of the embodiment) in which a plurality of cylinders (e.g., cylinder liner 2 of the embodiment) are formed:

a cooling passage (e.g., cooling passage 4c of the embodiment, the same applies hereinafter) formed to be located outside the cylinder for a cooling medium (e.g., cooling medium of the embodiment, the same applies hereinafter) to flow; and

cooling grooves (e.g., slits 5 of the embodiment, the same applies hereinafter), which are formed between adjacent ones of the cylinders, for a cooling medium to flow,

the water jacket is characterized in that,

in a cross-sectional view of the cylinder arrangement direction (e.g., the arrangement direction of the embodiment) of the end portion of the cooling groove (e.g., the slit end portion 5 b. of the embodiment, the same applies hereinafter), the end portion of the cooling groove is continuous with the inner wall of the cooling passage (e.g., the cylinder block inner wall 4 a. of the embodiment, the same applies hereinafter) via an inclined portion (e.g., the inclined portion 6. of the embodiment, the same applies hereinafter) that is inclined so as to become thicker toward the inner wall of the cooling passage.

According to the present invention, the end portion of the cooling groove and the inner wall of the cooling passage are continuous via the inclined portion, and the thermal stress and the compressive stress in the cooling groove are dispersed via the inclined portion. Thus, even if a cooling groove connecting the cooling passages is provided between the adjacent cylinders, the stress generated in the cylinder block can be relaxed.

[2] In the present invention, furthermore, it is preferable that,

the adjacent cylinders are connected through the following parts: a 1 st curved side (e.g., 1 st curved side 11 of the embodiment, the same applies hereinafter) that extends in a curved manner from the side wall side of one cylinder; a flat wall surface (for example, a flat wall surface 12 of the embodiment, the same applies hereinafter) which extends from a side edge of the 1 st curved side surface toward the other cylinder and is parallel to the cylinder arrangement direction; and a 2 nd curved side (e.g., the 2 nd curved side of the embodiment, the same below), that extends curved from the flat wall toward the other cylinder,

the cooling groove is provided in the flat wall surface.

According to the present invention, since the cooling groove is provided in the flat wall surface, thermal stress and compressive stress are less likely to concentrate in the cooling groove. Therefore, even if a cooling groove connecting the cooling passages is provided between the adjacent cylinders, the stress generated in the cylinder block can be relaxed.

[3] Further, a water jacket according to the present invention is provided in a cylinder block in which a plurality of cylinders are formed, the water jacket including:

a cooling passage formed outside the cylinder and through which a cooling medium flows; and

a cooling groove formed between adjacent cylinders for a cooling medium to flow,

the water jacket is characterized in that,

the adjacent cylinders are connected through the following parts: 1 st curved side surface extending from the side wall side of one cylinder in a curved manner; a flat wall surface extending from a side edge of the 1 st curved side surface toward the other cylinder and parallel to the cylinder arrangement direction; and a 2 nd curved side surface curved to extend from the flat wall surface toward the other cylinder,

the cooling groove is provided in the flat wall surface.

According to the present invention, since the cooling groove is provided in the flat wall surface, thermal stress and compressive stress are less likely to concentrate in the cooling groove. Therefore, even if a cooling groove connecting the cooling passages is provided between the adjacent cylinders, the stress generated in the cylinder block can be relaxed.

Drawings

Fig. 1 is an explanatory view showing a cylinder block provided with a water jacket according to an embodiment of the present invention.

Fig. 2 is a perspective view showing an end portion of the slit of the present embodiment.

Fig. 3 is a sectional view showing the inclined portion of the present embodiment.

Fig. 4 is a plan view showing an end portion of the slit according to the present embodiment.

Description of the reference symbols

1: a cylinder block;

2: a cylinder liner (cylinder);

3: a cylinder block main body;

4: a water jacket;

4 a: a cylinder block inner wall (inner wall of the cooling passage);

4 b: a cylinder block outer wall (outer wall of the cooling passage);

4 c: a cooling passage;

5: a gap (cooling groove);

5 a: the bottom of the gap;

5 b: a slit end;

6: an inclined portion;

6 a: an upper end bending part;

6 b: a lower end bent portion;

11: 1 st curved side;

12: a flat wall surface;

13: the 2 nd curved side.

Detailed Description

A cylinder block provided with a water jacket according to an embodiment of the present invention will be described with reference to the drawings.

Referring to fig. 1, a cylinder block 1 of an internal combustion engine according to the present embodiment includes: four cylinder liners 2 (corresponding to the cylinders of the present invention); a cylinder block body 3 that holds the cylinder liner 2; and a water jacket 4 provided to the block body 3 so as to cover the side surfaces of the cylinder liners 2.

The water jacket 4 includes a cooling passage 4c, and the cooling passage 4c is defined by: a cylinder block inner wall 4a that covers the cylinder liner 2; and a block outer wall 4b formed radially outward of the cylinder liner 2 so as to face the block inner wall 4a with a gap therebetween. In the water jacket 4, a cooling medium (cooling water) flows along the arrangement direction of the cylinder liners 2.

Gaps 5 (cooling grooves) are provided between the cylinder liners 2, and the gaps 5 connect cooling passages 4c partitioned from left to right by the cylinder liners 2 so that a cooling medium can flow therethrough. Referring to fig. 2, the bottom of the slit 5, i.e., the slit bottom 5a, is bent to avoid stress concentration.

Referring to fig. 2 and 3, the slit end 5b, which is an end of the slit 5, is continuous with the cylinder block inner wall 4a of the cooling passage 4c via the inclined portion 6 in the cross-sectional view of the cylinder liner 2 in the arrangement direction shown in fig. 3, and the inclined portion 6 is inclined so as to become thicker toward the cylinder block inner wall 4 a. The inclination angle of the inclined portion 6 is inclined more than the draft angle of the cylinder block 1. The upper end bent portion 6a of the inclined portion 6 on the slit 5 side and the lower end bent portion 6b of the inclined portion 6 on the cylinder block inner wall 4a side are provided so as to be close to each other, for example, in a range of 3mm to 6 mm.

Referring to fig. 4, adjacent cylinder liners 2 are continuous with each other by: a 1 st curved side surface 11 curved to extend in a recessed manner from a block inner wall 4a covering one cylinder liner 2; a flat wall surface 12 that extends from the side edge of the 1 st curved side surface 11 toward the other cylinder liner 2 and is parallel to the arrangement direction of the cylinder liners 2; and a 2 nd curved side surface 13 that extends from the flat wall surface 12 to curve toward the block inner wall 4a covering the other cylinder liner 2.

The slit 5 is arranged such that the slit end 5b is located on the flat wall surface 12.

According to the cylinder block 1 including the water jacket 4 of the present embodiment, the slit end portion 5b and the cylinder block inner wall 4a are continuous via the inclined portion 6, and the thermal stress and the compressive stress at the slit 5 are dispersed via the inclined portion 6. This allows stress generated in the cylinder block 1 to be relaxed even if the gap 5 connecting the cooling passages 4c is provided between the adjacent cylinder liners 2.

Further, according to the present embodiment, since the slit 5 is provided so that the slit end portion 5b is positioned on the flat wall surface 12, thermal stress and compressive stress are less likely to concentrate on the slit 5 than in the case where the slit end portion is positioned on a curved surface. Therefore, even if the gap 5 connecting the cooling passages 4c is provided between the adjacent cylinder liners 2, the stress generated in the cylinder block 1 can be relaxed.

In the present embodiment, the case where all the slits 5 are connected to the cylinder block inner wall 4a via the inclined portion 6 and are located on the flat wall surface 12 has been described, but the water jacket of the present invention is not limited to this, and the operational effects of the present invention, such as stress relaxation, can be obtained even if only a part of the slit end portions are connected to the inner wall of the cooling passage via the inclined portion, or only a part of the slit end portions are located on the flat wall surface, for example.

In the present embodiment, the case where three slits 5 are provided has been described, but the slits of the present invention are not limited to this, and for example, one slit, two slits, or four or more slits may be provided.