JP4267487B2 - Cylinder block cooling structure - Google Patents

Description

  The present invention relates to a cooling structure for a cylinder block, and more particularly to a cooling structure for a cylinder block that can uniformly cool a bore wall of the cylinder block.

Conventionally, the cooling structure of a cylinder block is disclosed by Unexamined-Japanese-Patent No. 2002-30989 (patent document 1), for example.
JP 2002-30989 A

  In the above document, a technique is disclosed in which a water jacket spacer is set in a water jacket of a cylinder block of an internal combustion engine to aim at uniform temperature of the bore wall. However, when the water jacket spacer is assembled without being fixed to the water jacket, the cooling water flows to the bore side of the spacer (between the spacer and the bore) due to the strong discharge pressure from the water pump in the vicinity of the inlet. . As a result, the temperature of the bore wall in that portion becomes particularly low, which causes problems such as deterioration in fuel consumption.

  That is, a gap is generated between the water jacket inner peripheral wall and the bore side region of the water jacket spacer in order to ensure variation in the dimensions of the water jacket and water jacket spacer used in the cylinder block and assembling. Since the water pressure is high at the site where the coolant enters the cylinder block from the water pump, the coolant flows into the gap. As a result, there has been a problem that the cylinder block cannot be cooled uniformly.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a cylinder block cooling structure capable of uniformly cooling the cylinder block.

The cooling structure of the cylinder block according to the present invention includes a cylinder block in which a water jacket portion is continuously provided around a bore wall and a hole for introducing a cooling medium from the water pump into the water jacket portion is provided. And a water jacket spacer inserted into the water jacket portion, a cooling medium is supplied to the water jacket portion from the hole, and a cylinder block cooling structure that equalizes the bore wall temperature. The water jacket spacer has a cooling medium passage inside thereof, introduces the cooling medium introduced from the water pump into the cooling medium passage, and the cooling medium supplied from the water pump directly contacts the bore wall in the vicinity of the hole. Adopts a structure to prevent this. The cooling medium has a structure branched into a cylinder block side passage and a cylinder head side passage.

  In the cooling structure of the cylinder block configured as described above, the cooling water inlet (hole) of the cylinder block is connected to the cooling medium passage provided in the water jacket spacer, and the cold cooling medium supplied from the water pump is cooled. Since it enters the water passage, overcooling of the bore wall at the water jacket inlet can be prevented. Thereby, deterioration of fuel consumption and oil consumption can be prevented.

By determining the cross-sectional area of the passage and the cylinder head passage of shea cylinder block cooling each, it is possible to realize an ideal distribution of the cold cooling water to the cylinder head and cylinder block.

  According to the present invention, it is possible to provide a cylinder block cooling structure capable of uniformly cooling the cylinder block.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
1 is an exploded perspective view of a cooling structure for a cylinder block according to a first embodiment of the present invention. Referring to FIG. 1, a cylinder block cooling structure 1 according to a first embodiment of the present invention has a water jacket portion 12 continuously provided around a bore wall 11b, and a cooling medium from a water pump. The cylinder block 10 provided with the hole 13h for supplying to the jacket part 12 and the water jacket spacer 20 inserted in the water jacket part 12 are provided. A cooling medium is supplied to the cylinder block 10 to make the temperature of the bore wall 11b uniform. The water jacket spacer 20 has a cooling medium passage 23 therein, and introduces the cooling medium introduced from the water pump into the cooling medium passage 23. This prevents the coolant supplied from the water pump directly from hitting the bore wall 11b in the vicinity of the hole 13h.

  The cooling medium passage 23 has a structure branched into a passage 23b on the cylinder block side and a passage 23a on the cylinder head side.

  The cylinder block 10 surrounds a cylinder liner assembly 11 located inside, a water jacket portion 12 as a cooling medium passage disposed so as to surround the cylinder liner assembly 11, a water jacket portion 12, and And a cylinder block base portion 13 facing the cylinder liner assembly 11.

  The cylinder liner assembly 11 is composed of an iron cylinder liner and an aluminum alloy surrounding the cylinder liner. The cylinder liner assembly 11 has a bore region 11h into which a piston is inserted, and the bore region 11h is a substantially cylindrical region. A plurality of bore regions 11h are arranged along one direction.

  In this embodiment, the number of bore regions 11h is three. However, the number of bore regions 11h is not limited to this, and various numbers of bore regions 11h may be provided. The cylinder liner assembly 11 has a bore wall 11b. The bore wall 11b is a region cooled by a cooling medium (cooling water) supplied to the water jacket portion 12, and heat generated in the bore region 11h is dissipated from the bore wall 11b to the outside.

  The water jacket portion 12 is an area provided between the cylinder liner assembly 11 and the cylinder block base portion 13 and has a function as a passage for a cooling medium. The water jacket portion 12 has a bottom portion (not shown), and the cylinder liner assembly 11 and the cylinder block base portion 13 are connected to the bottom portion. The width of the water jacket portion 12 is configured to be substantially uniform. That is, the distance between the bore wall 11b of the cylinder liner assembly 11 and the cylinder block base portion 13 is configured to be substantially equal.

  The cylinder block base portion 13 is made of an aluminum alloy and is configured by a method such as die casting. In addition, it does not specifically limit as a material of the cylinder liner aggregate | assembly 11 and the cylinder block base part 13, You may comprise not only an aluminum alloy but cast iron. The cylinder block base portion 13 serves as an engine block, and various accessories provided in the engine are attached. The cylinder block base portion 13 is provided with a hole 13 h as an inlet for cooling water, and the hole 13 h penetrates to the water jacket portion 12. From the hole 13h, a cooling medium having a relatively low temperature sent from the water pump is introduced.

  As the cooling medium, various fluids such as water, long life coolant, and oil can be used.

  A water jacket spacer 20 is inserted into the water jacket portion 12. The water jacket spacer 20 has a shape along the water jacket portion 12 and surrounds the cylinder liner assembly 11. The material of the water jacket spacer 20 is not particularly limited, and various materials such as aluminum, cast iron, other non-metallic materials, inorganic materials, and organic materials can be employed. A hole 21 is provided in the water jacket spacer 20, and a cooling medium passage 23 is formed in the water jacket spacer 20 so as to be continuous with the hole 21. A sealing material 22 made of foamed rubber or the like is provided so as to surround the hole 21. The hole 21 faces the hole 13h, and a sealing material 22 is provided to prevent a gap between the two holes. The cooling medium passage 23 has two passages 23a and 23b. The passage 23a is a passage for cooling the engine head, and is formed so as to extend once from the hole 21 along the cylinder liner assembly 11 in an arc shape and upward toward the engine head.

  The passage 23 b is a passage for cooling the water jacket, and extends gradually upward from the hole 21 and extends along the wall of the cylinder liner assembly 11. The outlets of the passages 23a and 23b are both provided on the upper surface of the water jacket spacer 20, that is, in the water jacket spacer 20 in a region facing the engine head.

  FIG. 2 is a perspective view of a water jacket spacer shown for explaining the flow of the cooling medium. Referring to FIG. 2, the cooling medium supplied from water pump 300 enters hole 21 as an inlet as shown by arrow 100. The cooling medium that has entered the hole 21 is divided into two passages 23a and 23b. The cooling medium that has entered the passage 23a exits the passage 203 as indicated by an arrow 101 and flows toward the engine head. The cooling medium that has entered the passage 23b exits the passage 23b as shown by an arrow 102 and is guided to the water jacket.

  FIG. 3 is a schematic plan view of the engine shown for explaining the flow of the cooling medium. Referring to FIG. 3, the cooling medium that has entered the direction indicated by arrow 100 flows in the direction indicated by arrow 101, and flows toward engine head 30 through gasket hole 41. On the other hand, the cooling medium flowing in the direction indicated by the arrow 102 flows toward the engine head 30 through the gasket hole 42. In the present invention, a block U-turn cooling system in which the cylinder block 10 is U-turned is adopted. That is, the cooling medium cools the cylinder liner assembly 11 and then flows to the engine head 30 through the gasket holes 41 and 42 to cool each component in the engine head. Thereafter, the cooling medium flows toward the radiator and releases heat from the radiator.

  FIG. 4 is a perspective view of the water jacket spacer. Referring to FIG. 4, the water jacket spacer 20 has a shape in which three cylindrical regions are connected, and a hole 21 as a cooling medium introduction port is provided on the front surface thereof. Two passages 23a and 23b are provided so as to be connected to the hole 21, and are arranged so as to branch in different directions.

  FIG. 5 is a cross-sectional view taken along line VV in FIG. Referring to FIG. 5, cooling water 100 </ b> W as a cooling medium supplied from water pump 300 in the direction indicated by arrow 100 enters a passage 23 b provided in water jacket spacer 20. At this time, a sealing material 22 is provided between the water jacket spacer 20 and the cylinder block base portion 13. Thereby, the joining property in the hole 21 vicinity can be improved, and the leakage of the cooling water 100W in this area | region can be prevented. A piston 50 is disposed inside the cylinder liner assembly 11. Moreover, since the leakage of the cooling water 100W can be prevented by the action of the sealing material, the low-temperature cooling water 100W supplied from the water pump 300 is prevented from directly contacting the bore wall 11b in the vicinity of the holes 21 and 13h. it can.

  That is, since the cooling water 100W is supplied to the water jacket of the cylinder block and the engine head through the passage provided in the water jacket spacer 20, the high pressure and low temperature cooling water 100W is in direct contact with the bore wall 11b. Can be prevented.

  In the present invention, an independent passage is provided in the water jacket spacer 20. Thereby, it can prevent that a cooling water hits a jacket directly and can suppress the supercooling in an inlet_port | entrance part.

(Embodiment 2)
In the second embodiment, the area of the passages in the two passages 23a and 23b is set to approximately 7: 3. The water jacket spacer 20 includes two passages 23a and 23b, and the opening area thereof is set in accordance with the required cooling heat quantity of the engine. In this embodiment, the area ratio of the passage 23a toward the engine head and the passage 23b toward the water jacket is approximately 7: 3.

  The configuration according to the second embodiment configured as described above has the same effect as that of the first embodiment.

  Although the embodiment of the present invention has been described above, the embodiment shown here can be variously modified. First, the engine to which the present invention is applied can be applied not only to a gasoline engine but also to a diesel engine. Furthermore, there are no particular restrictions on the size of the engine and the number of cylinders. Further, the present invention can be applied to various types of engines such as a series type, a V type, a W type, and a horizontally opposed type.

  The present invention can be applied in the field of a cooling structure for a cylinder block of an internal combustion engine.

It is a disassembled perspective view of the cooling structure of the cylinder block according to Embodiment 1 of this invention. It is a perspective view of the water jacket spacer shown in order to demonstrate the flow of a cooling medium. It is a typical top view of the engine shown in order to demonstrate the flow of a cooling medium. It is a perspective view of a water jacket spacer. It is sectional drawing along the VV line in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cylinder block cooling structure, 10 Cylinder block, 11 Cylinder liner aggregate | assembly, 12 Water jacket part, 13 Cylinder block base part, 20 Water jacket spacer, 21 Hole, 22 Seal material, 23 Cooling medium channel | path, 23a, 23b channel | path.

Claims (1)

A cylinder block provided with a water jacket portion continuously around the bore wall and provided with a hole for introducing a cooling medium from the water pump into the water jacket portion;
A water jacket spacer to be inserted into the water jacket portion;
A cooling structure for a cylinder block that supplies a cooling medium from the hole to the water jacket portion and equalizes the bore wall temperature,
The water jacket spacer has a cooling medium passage inside thereof, introduces the cooling medium from the water pump into the cooling medium passage, and the cooling medium supplied from the water pump directly contacts the bore wall in the vicinity of the hole. To prevent that
The cooling medium passage is a cylinder block cooling structure having a branch structure having a cylinder block side passage and a cylinder head side passage .

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