JP2008008195A - Engine cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To direct flow of cooling water introduced in a water jacket in a cylinder block of a closed deck structure to a predetermined direction without changing an internal structure of the cylinder block itself. <P>SOLUTION: A spacer member 20 is installed between a bore wall part 2 and a tension bolt boss part 13a of a cylinder block 1 constructed in such a manner that the tension bolt boss part 13a on a front end suction side which faces a cooling water introduction part 8 is formed in a roughly triangle pole shape and is arranged in a jacket space part in an island shape to branch cooling water to an intake side and an exhaust side. Consequently, intake proceeding U-turn type cooling water flow can be achieved without changing the internal structure of the cylinder block 1 and low temperature cooling water can be introduced to a head side water jacket as a sidestream. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooling device for an engine, and in particular, a flow of cooling water introduced into a water jacket of a cylinder block of a closed deck structure of an in-line multi-cylinder engine in which a plurality of cylinders are arranged in a row is formed in the internal structure of the cylinder block. The present invention relates to a technique for directing in a predetermined direction without making a change.

  As a cooling device for a cross flow type engine, a cooling water introduction portion is formed on the front end side of the side wall portion on the intake side of the closed deck type cylinder block to introduce the cooling water discharged from the water pump into the block side water jacket. The tension bolt boss located in the jacket space facing the cooling water introduction part is formed in a triangular prism shape in cross section, and the flow of the cooling water introduced from the cooling water introduction part to the block-side water jacket is transferred to the tension bolt boss part. Divided into two at the ridge line, one flow is guided to the intake side by the intake side guide surface of the boss portion, and the other flow is the front end side guide surface of the boss portion and the front end wall portion of the cylinder block. Between the intake side and exhaust side jacket spaces toward the rear end of the engine. Also, what the cooling water through the hole extending through the top deck of the cylinder block is configured to direct the head-side water jacket has been known (e.g., see Patent Document 1.).

  Also, in the open deck structure cylinder block, a partition is provided at one end of the head side water jacket that goes around the continuous bore wall of multiple cylinders, and the coolant introduced into the block side water jacket from one end side is provided. The circumference of the bore wall part is configured to be led out to the cylinder head side in almost one direction, and the partition part is constituted by an elastic body fitted between the cylinder block outer wall and the bore wall part. One in which a protrusion of an elastic body is elastically fitted to a recess provided on an outer wall of a cylinder block is known (for example, see Patent Document 2).

JP 2002-115600 A JP 2002-161743 A

  As a configuration of the cooling water passage formed by the water jacket of the cylinder block of the in-line multi-cylinder engine, for example, as described above, the cooling water introduced from one end side of the side wall of the cylinder block is divided into the intake side and the exhaust side, and the intake air There is an axial flow type in which the jacket space on the side and exhaust side flow toward the rear end side of the engine, respectively, and the cooling water introduced from one end side is unidirectional around the continuous bore wall of the cylinders There is a U-turn type in which the cylinder block is led to the cylinder head side almost once, and the internal structure of the cylinder block changes depending on which type is adopted. Therefore, for example, when the axial flow method is to be changed to the U-turn method, it is necessary to change the structure of the cylinder block itself in the conventional technique, and this change is costly.

  The present invention solves these problems, and can direct the flow of cooling water introduced into the water jacket of a cylinder block having a closed deck structure in a predetermined direction without changing the internal structure of the cylinder block itself. The purpose of this is to increase the compatibility of the cylinder block.

  In the cooling device for the engine of the present invention, the engine body in which a plurality of cylinders are arranged in a row forms a connected bore wall portion in which the bore walls of adjacent cylinders are continuous, and the block side around the bore wall portion. A cylinder block with a closed deck structure that forms a water jacket and a closed top deck portion at the top, and a cylinder head that is formed on the top deck portion of the cylinder block with a head side water jacket formed inside. The cylinder block has a cooling water outlet portion that communicates with the head side main cooling water introduction hole at the bottom of the cylinder head at one end of the top deck portion in the cylinder row direction. The engine width direction is perpendicular to the cylinder row direction. Cooling water discharged from the water pump is supplied to one end side in the cylinder row direction near the cooling water outlet portion on the side wall portion on one side. A cooling water introduction part to be introduced into the jacket is formed, and a columnar tension bolt boss part connected from the jacket bottom surface of the block side water jacket to the top deck part is formed around the jacket space part facing the cooling water introduction part of the block side water jacket. An engine cooling device provided in an island shape with a space between the tension bolt boss portion and the bore wall portion to be an opening communicating with the cooling water lead-out portion, the tension bolt boss portion and the bore wall portion, The spacer main body, the tension bolt boss, and the cylinder block of the cylinder block that regulate the flow of the cooling water in the opening between the base member, the tension bolt boss, and the bore wall held by the elastic force A spacer member that includes a restriction portion that restricts the flow of the cooling water in the jacket space between the end wall portion on the one side in the direction, and The main flow of the cooling water introduced from the cooling water introduction part by the sensor member is guided to the jacket space part between the tension bolt boss part and the side wall part on one side in the engine width direction, and is restricted by the restriction part of the spacer member. The side flow guided to the jacket space between the tension bolt boss and the end wall of the cylinder block on one side in the cylinder row direction is passed through the cooling water outlet and the head side main cooling water introduction hole at the bottom of the cylinder head. The head is configured to be guided to a water jacket on the head side.

  In this case, the cylinder block itself is, for example, a shaft that divides cooling water introduced into the head side water jacket from one end side of the side wall portion of the cylinder block and flows the jacket space portions on both sides in the engine width direction toward the rear end side of the engine. With the same internal structure as that constituting the flow type cooling water passage, without changing the internal structure of the cylinder block, the cooling water main flow in the block side water jacket is directed in one direction by the spacer member, A U-turn cooling flow with less stagnation can be realized. Further, a side flow that is restricted by the restriction part that is a part of the spacer member and is led to the jacket space part between the tension bolt boss part and the end wall part on one side in the cylinder row direction of the cylinder block, In addition, by leading to the head-side water jacket of the cylinder head through the head-side main coolant introduction hole at the bottom of the cylinder head, coolant having a low temperature can be reliably supplied to the head side.

  Here, the spacer member has a plurality of legs formed by cutting and raising a part of the plate material in cooperation with the main body portion of the base material portion, and between the tension bolt boss portion and the bore wall portion. It is configured to be sandwiched and held by its own elastic force, and the restricting portion is preferably constituted by an extended portion integrally formed with a plate material constituting the base material portion. Thereby, simplification of a spacer member is possible.

  The engine is a cross flow type engine in which an intake port and an exhaust port open on opposite side surfaces across the cylinder row center line of the cylinder head, and a side wall portion on the side where the cooling water introduction portion opens the intake port It may be formed. In this case, the cylinder block itself has the same internal structure as that constituting an axial flow type cooling water passage that divides the cooling water into the intake side and the exhaust side, and changes the internal structure of the cylinder block. In addition, the cooling water main flow in the block-side water jacket can be directed in one direction by the spacer member, and the intake-side preceding U-turn type cooling flow with less stagnation can be realized.

  As described above, according to the present invention, the flow of the cooling water introduced into the water jacket of the cylinder block having the closed deck structure can be easily changed without changing the internal structure of the cylinder block itself. In addition to being able to direct in a predetermined direction, cooling water having a low temperature can be reliably supplied also to the cylinder head side, and the compatibility of the cylinder block in changing the cooling water passage configuration can be enhanced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an example of an embodiment of the present invention. 1 is a plan view of a cylinder block in this embodiment, FIG. 2 is a horizontal sectional view of the upper part of the cylinder block, FIG. 3 is a sectional view taken along line AA in FIG. 1, and FIG. .

  In the engine according to this embodiment, a cylinder block 1 and a cylinder head (not shown) constitute an engine main body, and bores of four cylinders # 1 to # 4 are formed in series in the cylinder block 1, and a cylinder head ( (Not shown) are formed with an intake port and an exhaust port of each cylinder # 1 to # 4, and the intake port and the exhaust port open to the side surfaces of the heads opposite to each other across the cylinder row center line. It is an inline 4-cylinder engine.

  The cylinder block 1 has a closed deck structure, and has a connected bore wall portion 2 in which the bore walls of adjacent cylinders are continuous and the bore walls of four cylinders # 1 to # 4 are constricted between the cylinders. A block-shaped water jacket 3 having a deformed annular shape is formed around the connected bore wall portion 2 in which the bore walls of the four cylinders # 1 to # 4 are integrated, and a closed type top is formed at the top. A deck portion 4 is formed. The block-side water jacket 3 is formed to a depth corresponding to about half of the upper side of the bore wall. The cylinder head is disposed on the top deck portion 4 of the cylinder block 1. A head side water jacket is formed inside the cylinder head.

  The cylinder block 1 includes a front end portion (an end portion on the left side in FIGS. 1 and 2) that is one end portion in the cylinder row direction and a side portion of the side wall portion 5 on the intake side (the lower side in FIGS. 1 and 2). Further, a water pump housing 6 in which a mechanically driven water pump (not shown) is arranged is formed, and a thermostat housing 7 in which a thermostat valve (not shown) is arranged is formed adjacent to the water pump housing 6. Has been. Then, a cooling water introduction part 8 for introducing the cooling water discharged from the water pump into the block-side water jacket 3 into the side wall part 5 between the water pump housing 6 and the head-side water jacket 3 on the front end side of the cylinder block 1. Is formed.

  Further, the cylinder block 1 communicates with the head side main coolant introduction hole 9 at the bottom of the head through the hole of the head gasket (not shown) at the front end portion (end portion on one side in the cylinder row direction) of the top deck portion 4. An opening 10 is formed as a cooling water lead-out portion. The top deck portion 4 of the cylinder block 1 communicates the block side water jacket 3 of the cylinder block 1 with the head side water jacket of the cylinder head through a hole of a head gasket (not shown) in addition to the opening 10. A large number of openings 11 are formed around the bore wall 2. Note that holes (not shown) of the head gasket provided corresponding to the openings 10 and 11 of the top deck portion 4 are openings as cooling water outlets communicating with the head side main cooling water introduction hole 9. The hole communicating with 10 is large, and the other holes are not so large and mainly function as gas vent holes.

  The cylinder block 1 includes an intake side and an exhaust side of a constricted portion between the cylinders of the bore wall 2, an intake side (lower side of FIGS. 1 and 2), and an exhaust side (lower side of FIGS. 1 and 2). Ten tension bolt boss portions 13 having bolt holes 12 are formed in a total of 10 locations (upper side in FIG. 2), and the tension bolt boss portion 13a on the intake side on the front end side (one end side in the cylinder row direction) is a cylinder block. 1 is formed in a substantially triangular prism shape connected from the bottom of the jacket to the top deck portion in an island-like arrangement with a space around the jacket space portion facing the cooling water introduction portion 8, and this substantially triangular prism-shaped tension bolt boss portion A cooling water passage K1 connected to the intake side jacket space is formed between 13a and the side wall portion 5 on the intake side of the cylinder block 1, and the opening is formed between the front end wall portion 14 of the cylinder block 1 and the above. 10 cooling water passage K2 communicating is formed, also between the bore wall portion 2 has an opening portion K3 that communicates with the opening 10.

  A spacer member 20 is interposed between the tension bolt boss 13 a on the front end intake side of the cylinder block 1 and the bore wall 2.

  The spacer member 20 includes a base member 21 that is held by elastic force, a spacer main body 22 that regulates the flow of cooling water in the opening K3 between the tension bolt boss 13a and the bore wall 2, and a tension bolt. It consists of a restricting portion 23 that restricts the flow of cooling water between the boss portion 13a and the front end wall portion 14 of the cylinder block 1, and the base material portion 21 and the restricting portion 23 are formed of a single plate material, The spacer body 22 is formed by pouring a rubber material (vulcanized rubber).

  The base material part 21 cuts and raises a part of a substantially rectangular metal plate to form a plurality of legs 21a to 21d, curves the plurality of legs 21a to 21d and the main body part in opposite directions, and a tension bolt boss part. The plurality of legs 21 a to 21 d and the main body portion cooperate with each other and are held by their own elastic force while being sandwiched between 13 a and the bore wall portion 2. When the spacer member 20 is inserted between the tension bolt boss portion 13a and the bore wall portion 2 at one end of the main body portion of the base material portion, the tension bolt boss portion 13a and the tension bolt boss portion 13a An extending portion is integrally formed so as to partially protrude into the jacket space portion between the front end wall portion 14 of the cylinder block 1, and the limiting portion 23 is configured by this extending portion. The spacer body 22 is formed so as to almost completely close the opening K3 between the tension bolt boss 13a and the bore wall 2.

  In this engine, the cooling water discharged from the water pump is introduced from the cooling water introduction portion 8 into the jacket space portion on the intake side of the front end portion of the water jacket 3 in the block. The opening K3 between the tension bolt boss 13a and the bore wall 2 is closed by the spacer main body 22 of the spacer member 20, and between the tension bolt boss 13a and the front end wall 14 of the cylinder block 1. Since the flow of the cooling water is restricted by the restriction portion 23 of the spacer member 20, the main flow of the cooling water introduced from the cooling water introduction portion 8 is between the tension bolt boss portion 13 a and the side wall portion 5 of the cylinder block 1. The cooling water led to the jacket space and sent to the intake side, and the cooling water guided between the tension bolt boss portion 13a and the front end wall portion 14 under the restriction by the restriction portion 23 becomes a side flow and leads to the cooling water. From the opening 10 as a part, it passes through the hole of the head gasket and is guided to the head side water jacket of the cylinder head through the head side main cooling water introduction hole 9. .

  Then, the cooling water sent to the intake side of the block-side water jacket 3 flows toward the rear end side of the cylinder block 1 on the intake side, makes a U-turn at the rear end portion, and flows toward the front end side on the exhaust side. Then, it merges with the substream at the front end side and is led out to the head side water jacket. In this way, the block-side water jacket 3 realizes the cooling water flow of the intake-side preceding U-turn system.

  Further, the cooling water introduced from the head side main cooling water introduction hole 9 to the head side water jacket of the cylinder head flows to the rear end side on the exhaust side and the intake side by the axial flow method. And finally, it is discharged from the cooling water outlet part provided at the rear end part of the cylinder head.

  The engine cylinder block 1 itself can be used without the spacer member 20 interposed. In this case, for example, cooling water introduced into the head side water jacket from the front end side of the side wall portion 5 of the cylinder block 1. Can be divided by the tension bolt boss 13 (13a) having a substantially triangular prism section, and an axial flow type cooling water passage can be formed in which the jacket space on the intake side and the exhaust side flows toward the rear end side of the engine. . By inserting the spacer member 20, it is possible to realize a U-turn type cooling water flow with less stagnation without changing the internal structure of the cylinder block 1. Thus, the cylinder head can be reliably supplied to the head side water jacket.

  As mentioned above, although an example of embodiment was demonstrated, this invention is not limited to this, It can implement in another various aspect.

It is a top view of the cylinder block in the embodiment of the present invention. It is a horizontal sectional view of the cylinder block upper part in the embodiment of the present invention. It is AA sectional drawing of FIG. It is a perspective view of the insertion state of the spacer member in the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Bore wall part 3 Block side water jacket 4 Top deck part 5 Side wall part at intake side 6 Water pump housing 8 Cooling water introduction part 9 Head side main cooling water introduction hole 10 Opening part as cooling water lead-out part 12 Bolt Hole 13 Tension bolt boss portion 13a Tension bolt boss portion on the front end intake side K1 Cooling water passage K2 Cooling water passage K3 Opening portion 20 Spacer member 21 Base material portion 22 Spacer body 23 Restriction portion

Claims (3)

The engine body with a plurality of cylinders arranged in a row forms a connected-type bore wall part in which the bore walls of adjacent cylinders continue, and a block-type water jacket is formed around the bore wall part to form a closed type at the top. A closed deck structure cylinder block that forms a top deck portion of the cylinder, and a cylinder head that is formed on the top deck portion of the cylinder block with a head side water jacket formed therein, A cooling water outlet portion communicating with the head side main cooling water introduction hole at the bottom of the cylinder head is formed at one end of the top deck portion in the cylinder row direction, and a side wall portion on one side in the engine width direction perpendicular to the cylinder row direction The cooling water discharged from the water pump to one end side in the cylinder row direction near the cooling water outlet portion of the block side water jacket A columnar tension bolt boss that is formed with a cooling water introduction part to be introduced into the block and is connected to a jacket space part facing the cooling water introduction part of the block side water jacket from the jacket bottom surface of the block side water jacket to the top deck part In the engine cooling device, the portion is provided in an island shape with a space around the periphery, and the tension bolt boss portion and the bore wall portion become an opening communicating with the cooling water outlet portion.
Between the tension bolt boss part and the bore wall part, the flow of cooling water in the opening part between the base material part held by elastic force and the tension bolt boss part and the bore wall part is regulated. A spacer member comprising a spacer main body, a tension bolt boss portion, and a limiting portion for restricting the flow of cooling water in the jacket space portion between one end wall portion of the cylinder block in the cylinder row direction, The main flow of the cooling water introduced from the cooling water introducing portion by the spacer member is guided to the jacket space portion between the tension bolt boss portion and the side wall portion on one side in the engine width direction, and is restricted by the restriction portion of the spacer member. The secondary flow guided to the jacket space between the tension bolt boss and the end wall on one side in the cylinder row direction of the cylinder block Cooling device for an engine through the head-side main cooling water introducing hole in the bottom of the cylinder head, characterized by being configured to direct the head-side water jacket of the cylinder head. The spacer member includes a plurality of legs formed by cutting and raising a part of the plate material in the base material portion, in cooperation with the main body portion of the base material portion, and between the tension bolt boss portion and the bore wall portion. It is comprised so that it may be pinched | interposed into and hold | maintained with its own elastic force, The said restriction | limiting part is comprised by the extended part integrally formed in the board | plate material which comprises the said base material part. Item 4. The engine cooling device according to Item 1. The engine is a cross-flow type engine in which an intake port and an exhaust port are opened on opposite side surfaces across a cylinder row center line of a cylinder head, and the side wall on the side where the cooling water introduction part opens the intake port The engine cooling device according to claim 1, wherein the engine cooling device is formed in a portion.

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