JP3976379B2 - Cooling structure around the engine cylinder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure with improved circulation of cooling water around an engine cylinder.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4, the cooling structure around the cylinder of the engine is formed between the outer wall 2 of the cylinder block and the outer wall 7 of the water jacket by using a hole 11 formed in the outer wall 7 of the water jacket. The cooling water from the gallery 3 was introduced into a water jacket 8 formed between the bore wall 5 of the cylinder bore 4 and the water jacket outer wall 7.
[0003]
[Problems to be solved by the invention]
In the above-described conventional structure, the hole 11 is directly opened in the water jacket 8. Therefore, the cooling water introduced into the water jacket 8 from the punched hole 11 flows into the water jacket 8 while being directed in the cast hole 11, and as a result, the water jacket 8 is moved back and forth (left and right in the figure). In many cases, the flow of cooling water is uneven and the temperature does not flow uniformly around the cylinder bore, resulting in uneven temperature distribution.
[0004]
An object of the present invention is to provide a cooling structure around the cylinder of an engine that improves the flow of cooling water introduced into a water jacket around the cylinder and makes the temperature distribution around the cylinder bore uniform.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a structure in which a gallery cast hole is formed at a position deviated from the center position of the cylinder bore on the outer wall of the cylinder block, and the bore wall for fitting and holding the cylinder liner constituting the cylinder bore. In the engine in which a water jacket is formed between the outer wall of the water jacket and the outer wall of the water jacket, a gallery is provided between the outer wall of the water jacket and the outer wall of the cylinder block. A tool such as a drill is inserted in an axial direction passing through the gallery casting hole while being inclined with respect to the outer wall of the water jacket at a site close to the gallery casting hole. and, the gallery and the water through the space formed at the back of the hole and the hole It is characterized in that communicated the jacket.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are partial views of a cylinder block. Reference numeral 1 denotes a cylinder block. In FIG. 2, F is front and R is rear. 2 is an outer wall of the cylinder block, 3 is a gallery, and 4 is a cylinder bore.
[0007]
FIG. 3 is an enlarged view of the main part, in which a water jacket 8 is formed between a bore wall 5 for fitting and holding a cylinder liner 6 constituting the cylinder bore 4 and a water jacket outer wall 7, while the water jacket outer wall 7 and the cylinder are formed. A gallery 3 is formed between the outer walls 2 of the block.
[0008]
On the outer wall 2 of the cylinder block, a gallery cast hole 9 is opened at a position biased rearward (right side in the figure) from the center position of the cylinder bore 4 and closed with a lid 10. Further, the outer wall 7 of the water jacket is provided with a cast hole 11, which is closed by fitting a plug 12 therein.
[0009]
In view of this, the present invention is directed to a portion of the outer wall 7 of the water jacket close to the gallery punch hole 9 along the axial direction 15 inclined with respect to the axial line 16 in the longitudinal direction of the engine passing through the center of the cylinder bore 4 and facing forward. In addition to providing a hole 14 that opens, the space 3 is formed at the back of the hole 14 so that the gallery 3 communicates with the water jacket 8 through the hole 14 and the space.
[0010]
In the illustrated example, the hole 14 is formed in the inclined surface 13 perpendicular to the inclined axial direction 15 , but the inclined surface 13 is not necessarily formed , and the axial line in the longitudinal direction of the engine passing through the center of the cylinder bore 4. A hole 14 that opens forward along an axial direction 15 that is inclined with respect to 16 is formed in the outer wall 7 of the water jacket concentric with the cylinder bore 4, and a space is formed on the back of the hole 14, thereby forming the hole 14 and the space The gallery 3 may be in communication with the water jacket 8 via
[0011]
The opening of the hole 14 is easily performed by using a gallery cast hole 9 and inserting a tool such as a drill along the inclined axial direction 15 from the gallery cast hole 9.
[0012]
Since the present invention has the structure as described above, a part of the cooling water supplied to the gallery 3 is introduced into the water jacket 8 through the hole 14 that opens forward along the inclined axis 15. The cooling water introduced from the hole 14 flows into the water jacket 8 after the orientation by the hole 14 is relaxed by the opening action by the space formed at the back of the hole 14. It distributes to the periphery of the bore wall 5 and efficiently circulates.
[0013]
That is, after the cooling water flowing through the gallery 3 is taken in from the hole 14 that opens forward, the direction of the flow is relaxed by the space formed at the back of the hole 14 and then the water jacket 8 is applied. Inflow. Accordingly, the cooling water flowing into the space from the hole 14 is smoothly distributed in the left-right direction in the figure when flowing into the water jacket 8 and flows uniformly around the bore wall 5. Distribution is improved. Therefore, the temperature of the cylinder liner 6 is efficiently lowered to improve the heat conduction and distribution of the cylinder liner 6, preventing deformation of the cylinder bore 4 and reducing oil consumption. Moreover, since the hole 14 is formed with a tool such as a drill inserted in the direction of the axis 15 from the gallery punched hole 9, there is an advantage that the hole 14 can be easily processed.
[0014]
【The invention's effect】
As described above, according to the present invention, the flow of cooling water introduced into the water jacket around the cylinder is improved and the temperature distribution around the cylinder bore is made uniform, so that deformation of the cylinder bore is prevented and oil consumption is reduced. It has the advantage that it can be reduced. Moreover, since a hole is formed with tools, such as a drill inserted in the axial direction from the gallery casting hole, a hole can be processed easily.
[Brief description of the drawings]
1 is a side view of an engine equipped with the present invention. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 3 is an enlarged view of the main part of the present invention. Sectional view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder block outer wall 3 Gallery 4 Cylinder bore 5 Bore wall 6 Cylinder liner 7 Water jacket outer wall 8 Water jacket 9 Gallery cast hole 10 Lid 14 hole

Claims (1)

A bore hole (9) is formed in the outer wall (2) of the cylinder block at a position deviated from the center position of the cylinder bore (4), and the bore for inserting and holding the cylinder liner (6) constituting the cylinder bore (4). In an engine in which a water jacket (8) is formed between the wall (5) and the water jacket outer wall (7), while a gallery (3) is provided between the water jacket outer wall (7) and the outer wall (2) of the cylinder block. Drilling in the direction of the axis (15) passing through the gallery punched hole (9) while being inclined with respect to the axis (16) of the engine longitudinal direction passing through the center of the cylinder bore (4) from the gallery cast hole (9) Wotaji in the near portion of the tool to insert the by said axis (15) along the direction and toward the front punching cast gallery holes (14) for opening hole etc. (9) Socket formed in the outer wall (7), the bore (14) and holes (14) back into the formed through the space of the engine, characterized in that communicated the gallery (3) and the water jacket (8) of Cooling structure around the cylinder.

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