JPH0566219U - Cooling device for cylinder block in engine - Google Patents

Abstract

(57) [Summary] [Objective] The present invention has made it possible to uniformly and efficiently cool the heating portion of the engine cylinder block. In an engine in which a main refrigerant jacket 26 is provided in a cylinder block 1 so as to surround a plurality of cylinders 4, front and rear refrigerant galleries 29, 30 are provided along an outer side surface of the cylinder block 1 in the longitudinal direction. Before opening the refrigerant gallery 29, 30 and the main refrigerant jacket 26 in the cylinder outer wall 6 corresponding to both sides of each cylinder 4,
The rear communication holes 34 and 35 communicate with each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cooling device for a cylinder block of an engine using a coolant such as water.

[0002]

[Prior Art]

 In a conventional multi-cylinder cylinder block, a cooling water passage is provided so as to surround a plurality of cylinders, and a cooling water inlet passage and a cooling water outlet passage are superposed on the outside of this passage to cool the cooling water. It is already known that the water is allowed to flow from the water passage to the cooling water outlet passage (see Japanese Utility Model Laid-Open No. 61-57124).

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional one, since the cooling water that has cooled one side of the cylinder group and heated up flows to the other side of the cylinder group, not only the cooling efficiency of the cylinder group is poor, but also the entire circumference thereof is evenly distributed. There is the problem of insufficient cooling.

The present invention has been made in consideration of such circumstances, and is implemented in a mono engine block in which a cylinder block and a cylinder head are integrated so that a plurality of cylinders can be cooled very efficiently and evenly. It is an object of the present invention to provide a cooling device for a cylinder block in a new engine that is effective and effective.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is characterized in that in a cylinder block having a plurality of cylinders and a main refrigerant jacket surrounding the cylinders between the cylinder outer walls, both side surfaces along the longitudinal direction of the cylinder outer walls. Before and after communicating with the refrigerant inlet port, a rear refrigerant gallery is provided, and the gallery and the main refrigerant jacket are communicated with each other through the communication holes corresponding to both sides of each cylinder and opened in the cylinder outer wall. And in.

[0006]

【Example】

 An embodiment in which the present invention is applied to a mono engine block in which a cylinder block and a cylinder head are integrated will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of a part of the engine block taken along the line 1-1 of FIG. 2, FIG. 2 is a vertical cross-sectional view taken along the line 2-2 of FIG. 1, and FIG. 3 is a transverse sectional view taken along the line 3-3, and FIG. 4 is a transverse sectional view taken along the line 4-4 in FIG.

In FIGS. 1 and 2, an engine block B, which constitutes a main part of the engine, is configured as a so-called monoblock in which a cylinder head 2 is integrally connected to an upper part of a cylinder block 1, and the cylinder block 1 is A Siamese cylinder body 3 in which three cylinders 4 are connected in series through a boundary wall 5 is provided, and between the upper portion of the Siamese cylinder body 3 and the cylinder outer wall 6, a block side refrigerant jacket J B described in detail later. Is provided. A piston 15 is slidably fitted in each cylinder 4 as usual, and the piston 15 is connected to a crankshaft (not shown) via a connecting rod.

On the other hand, a combustion chamber 9 is formed in the cylinder head 2 so as to correspond to the three cylinders 4, and intake and exhaust ports 10 and 11 and a fuel injection valve 18 communicating with the combustion chamber 9 are attached. The fuel passage 12, the intake / exhaust valve guide holes 13 and 14 of the exhaust valves 16 and 17 are provided, and the head side refrigerant jacket JH is provided so as to surround the combustion chamber 9, the intake and exhaust ports 10 and 11 and other heating parts. It is provided.

Further, a valve operating chamber 20 is formed in the upper part of the cylinder head 2, and a valve operating mechanism 23 including a valve operating cam 21, a rocker arm 22 and the like is housed in the valve operating chamber 20. A head cover 24 is fixed to the upper surface of the opening of the valve operating chamber 20 via a packing.

At the connecting portion between the cylinder block 1 and the cylinder head 2, a deck wall 7 is formed integrally and continuously with the ceiling wall 8 of the combustion chamber 9, and the deck wall 7 extends to the cylinder outer wall 6. The ceiling wall 8 of the combustion chamber 9 and the cylinder outer wall 6 are integrally bridge-connected to each other, and the deck wall 7 is a partition wall for partitioning the block side refrigerant jacket JB and the head side refrigerant jacket JH. It serves as a reinforcing wall at the connecting portion between the cylinder block 1 and the cylinder head 2.

Next, referring to FIGS. 1 and 2 together with FIGS. 3 and 4, the specific structure of the block side cooling medium jacket JB of the cylinder block 1 will be described. The upper part of the Siamese cylinder body 3, that is, the combustion chamber 9 Is surrounded by a cylinder outer wall 6 which is integral therewith, and a main refrigerant jacket 26 is formed between them so as to surround the Siamese cylinder body 3. The front and rear outer surfaces of the cylinder outer wall 6 along the arrangement direction of the cylinders 4 are provided with a plurality of flat front and rear mounting surfaces 31, 32 corresponding to the central portions of the cylinders 4, respectively. A pair of front and rear refrigerant gallery 29, 30 forming a pair of refrigerant passages 27, 28 having an oval cross section are fixed to a plurality of connecting bolts 33 via packing. Front and rear surfaces of the cylinder outer wall 6 are provided with three front and rear communication holes 34 and 35, respectively, for each cylinder 4 and through the communication holes 34 and 35. The refrigerant passages 27 and 28 are communicated with the main refrigerant jacket 26.

As shown in FIGS. 2 and 4, one end wall in the longitudinal direction of the cylinder outer wall 6 is provided with an inflow port 36 and communication passages 37, 38 that communicate the inlet port 36 with one ends of the front and rear refrigerant ducts 29, 30. And an inflow pipe 39 is connected to the open end of the inflow port 36.

An outlet 40 communicating with the head-side refrigerant jacket JH is opened at an end of the head-side refrigerant jacket JH opposite to the inflow port 36, and an outlet pipe 41 is connected to the outlet 40. Communicated. A refrigerant circuit C is connected between the inflow pipe 39 and the outflow pipe 41, and a refrigerant pump P and a radiator R are connected in series to the refrigerant circuit C as usual.

As clearly shown in FIG. 3, a plurality of refrigerant communication ports 42 for communicating the main refrigerant jacket 26 of the block side refrigerant jacket JB and the head side refrigerant jacket JH are provided in the deck wall 7 of each cylinder 4. The holes are provided at intervals in the circumferential direction. Further, a bottomed refrigerant flow passage 43 which is open to the deck surface 7 is formed along each of the boundary walls 5 between the cylinders 4 along the boundary walls 5.

Next, the operation of this embodiment will be described. When the engine is operated and the refrigerant pump P is driven, the refrigerant such as water flows into the inlet pipe 39 and the inlet as shown by the arrow in FIG. 36 and the branch passages 37, 38 to divide the refrigerant passages 27, 28 substantially evenly, and further pass from the refrigerant passages 27, 28 through a plurality of front and rear communication holes 34, 35 to pass through the main refrigerant jacket. 26, the refrigerant is evenly distributed to the front and rear corresponding parts of each cylinder 4, and a part of the refrigerant flowing in the main refrigerant jacket 26 flows through the refrigerant flow passage 43 above the boundary wall 5 to uniformly distribute the Siamese cylinder body 3. It can be cooled efficiently.

Further, the refrigerant flowing in the main refrigerant jacket 26 flows through the plurality of refrigerant communication ports 42 opened in the deck wall 7 to the head side refrigerant jacket JH to cool the cylinder head 2 and then the outlet 40 and the outflow pipe 41. After passing through it to the radiator R for cooling, it is sucked into the refrigerant pump P.

In the above embodiment, the present invention is applied to a three-cylinder in-line engine, but the present invention can be applied to other types of multi-cylinder engines. Although the monoblock engine in which the block and the cylinder head are integrated has been described, it is needless to say that the present invention can be applied to a normal engine block in which the block and the cylinder head are separated and are bonded together via a gasket.

[0019]

[Effect of the device]

 As described above, according to the first aspect of the present invention, the front and rear refrigerant gallery, which communicate with the refrigerant inlet, are integrally provided on both side surfaces along the longitudinal direction of the cylinder outer wall, and the gallery and the main refrigerant jacket are provided. Since they are communicated with each other through the communication holes opened on the outer wall of the cylinders corresponding to both sides of each cylinder, it is possible to uniformly distribute the refrigerant, which is cooled to the same degree for each cylinder, to the main refrigerant jacket. As a result, the plurality of cylinders can always be cooled uniformly and efficiently, which contributes to the improvement of engine performance.

According to the second aspect of the invention, a refrigerant inlet is provided at one end of the cylinder block in the longitudinal direction, and the inlet and the front and rear refrigerant galleries are superposed on the refrigerant jacket. Since the communication is made via the branch passage, it is not necessary to attach this branch passage as a separate member while ensuring the sealability, and the assembly is easy, and the refrigerant flowing from the inlet of the cylinder block into the cylinder block is It is possible to supply the cold refrigerant, which is hard to receive the heat from the main refrigerant passage, to the effect of the invention of the first aspect.

[Brief description of drawings]

1 is a longitudinal sectional view of a part of an engine block taken along line 1-1 of FIG.

FIG. 2 is a vertical sectional view taken along line 2-2 of FIG.

3 is a cross-sectional view taken along the line 3-3 of FIG.

4 is a cross-sectional view taken along the line 4-4 of FIG.

[Explanation of symbols]

 4 Cylinder 6 Cylinder outer wall 26 Main refrigerant jacket 29 Front refrigerant gallery 30 Rear refrigerant gallery 34,35 Communication hole 36 Inlet 37,38 Branch passage

Claims (2)

[Scope of utility model registration request] 1. A cylinder block in which a main refrigerant jacket (26) is provided between a plurality of cylinders (4) and the cylinder outer wall (6) so as to surround the cylinder (4), and the length of the cylinder outer wall (6) is increased. Before and after communicating with the refrigerant inlet port (36) on both sides along the direction, the rear refrigerant gallery (29,
30), and the gallery (29, 30) and the main refrigerant jacket (26) are opened in the cylinder outer wall (6) corresponding to both sides of each cylinder (4). , 35).
Cooling device for cylinder block in engine. 2. A refrigerant inlet port (36) is provided at one longitudinal end of the cylinder block, and the refrigerant inlet port (36) is provided.
And a branch passage (37, 37) in which the front and rear refrigerant gallery (29, 30) are superposed with the refrigerant jacket (26).
38) A cooling device for a cylinder block in an engine according to the above item 1, which is communicated with the cooling device through the cooling device.