JP2015083790A - Cooling device of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of an engine capable of suppressing pressure loss of cooling water introduced into a water jacket.SOLUTION: A cooling device of an engine E including a water jacket 11 formed in a state of surrounding the circumference of a plurality of cylinder bores 13 disposed on a cylinder block 1, and a spacer 4 disposed in the water jacket 11, further includes a cooling water introduction port 14 for introducing cooling water into the water jacket 11 from the external of the cylinder block 1, and a rectifying portion 51 as a rectifying portion 51 extended to an upstream side in the cooling water introducing direction, from upper and lower portions of a part corresponding to the cooling water introduction portion 14, of the spacer 4, and preventing generation of swirl flow around a horizontal axis caused by flowing of the introduced cooling water along the spacer 4.

Description

  The present invention relates to an engine cooling apparatus, and more particularly to an engine cooling apparatus provided with a spacer in a water jacket of a cylinder block.

2. Description of the Related Art Conventionally, a cylinder block of an engine mounted on a vehicle includes a cylinder liner that slidably accommodates a piston, and a water jacket that is formed so as to surround a cylinder bore formed by the cylinder liner. The cooling around the cylinder bore is performed by circulating cooling water in the water jacket.
The piston top dead center side close to the combustion chamber receives combustion heat directly by the combustion cycle, so that the temperature easily rises, and the piston bottom dead center side away from the combustion chamber hardly rises in temperature.
In the case of a cylinder block made of an aluminum alloy, the material strength may deteriorate at a temperature exceeding 200 ° C., and thermal distortion may occur due to a temperature difference from the surroundings.
Therefore, a spacer that surrounds the cylinder bore is provided in the water jacket to secure the flow rate and flow velocity of the cooling water on the piston top dead center side where the cooling performance of the cylinder bore is required. The flow rate and flow velocity of the cooling water on the dead center side are reduced.

The engine cooling device of Patent Document 1 includes a spacer that surrounds a cylinder bore in a water jacket, and this spacer partitions the inclined portion that approaches the piston top dead center toward the downstream side and the water jacket into an upstream side and a downstream side. A rectifying part having a partition part is provided.
As a result, a large amount of cooling water flows to the piston top dead center side portion in the water jacket to achieve uniform cooling in the axial direction of the cylinder bore, and the cooling water is in one desired direction around the cylinder liner (hereinafter referred to as a specific arrangement direction). In order to achieve uniform cooling in the arrangement direction of the cylinder bores.

JP 2009-243414 A

In the engine cooling device of Patent Document 1, the cooling water introduced into the water jacket from the cooling water inlet is rectified by the rectifying portion of the spacer and flows in the water jacket in a specific arrangement direction. The cylinder liner can be uniformly cooled in the arrangement direction of the cylinder bores even if the temperature rises with the flow of.
However, in the engine cooling device of Patent Document 1, attention is paid only to the cooling water flowing in the arrangement direction of the cylinder bores along the spacer, and the cooling water introduced into the water jacket from the cooling water inlet is rebounded from the spacer. Since behavior is not taken into consideration at all, there is a possibility that the size of the engine will increase due to an increase in capacity of the water pump.

Usually, the cooling water introduced from the cooling water inlet into the water jacket collides with the spacer and bounces back, and then travels in the specific arrangement direction, and the anti-specific arrangement direction is opposite to the specific arrangement direction. And the cooling water traveling in a direction other than the specific arrangement direction and the anti-specific arrangement direction (cylinder bore arrangement direction).
In the engine cooling device of Patent Document 1, only the cooling water traveling in the specific arrangement direction is allowed by forcibly blocking the flow of cooling water traveling in the direction opposite to the specific arrangement direction using a partition. Therefore, pressure loss may occur in the cooling water introduced from the cooling water inlet into the water jacket.

In addition, the cooling water that bounces off when colliding with the spacer advances in the axial direction of the cylinder bore in addition to the arrangement direction of the cylinder bores. There is concern about the occurrence of pressure loss for the flowing cooling water.
Therefore, the present inventor conducted a fluid analysis of the flow distribution of the cooling water bounced from the spacer for the cooling water introduced into the water jacket from the cooling water inlet.
As a precondition for the analysis, the cooling water inlet is introduced to the spacer so that the cooling water collides with the wall surface of the spacer and the cooling water advances in the specific arrangement direction and the cooling water advances in the anti-specific arrangement direction. It arrange | positioned in the position where the tangential direction in the part corresponding to an opening | mouth and the introduction direction of cooling water cross | intersect.

FIG. 15 shows the fluid analysis result of the flow distribution of the cooling water bounced off the spacer.
FIG. 15 is a longitudinal sectional view of a portion corresponding to the cooling water inlet of the spacer, and the arrows indicate the traveling direction of the cooling water.
The cooling water W bounced off from the spacer A is diverted in the vertical direction in the axial direction of the cylinder bore. As a result, the vortex accompanying fluid separation is generated by the cooling water W divided into the upper part and the lower part of the part corresponding to the cooling water inlet of the spacer, respectively, and the upper swirl flow F1 and the lower swirl flow F2 around the horizontal axis These two swirling flows were found to be formed.
As a result of this analysis, the upper swirl flow F1 and the lower swirl flow F2 generate turbulence that hinders the progress of the cooling water W traveling in the specific arrangement direction. It was found that it becomes a factor of pressure loss. That is, in the engine cooling device of Patent Document 1, there is a risk that an upper swirl flow and a lower swirl flow around the horizontal axis may be generated by the coolant diverted to the upper and lower portions of the portion corresponding to the cooling water inlet of the spacer. There is a possibility that pressure loss may occur in the cooling water traveling in the specific arrangement direction.

  An object of the present invention is to provide an engine cooling device or the like that can suppress the pressure loss of cooling water introduced into a water jacket.

  The engine cooling device according to claim 1 is an engine cooling device including a water jacket formed so as to surround a plurality of cylinder bores provided in the cylinder block, and a spacer disposed in the water jacket. A cooling water introduction port for introducing cooling water into the water jacket from the outside of the cylinder block, and an introduction direction of the cooling water from one of an upper portion and a lower portion of the spacer corresponding to the cooling water introduction port A rectifying unit that extends upstream, and includes a rectifying unit that rectifies so as not to generate a swirling flow around the horizontal axis that is generated when the introduced cooling water flows along the spacer.

  In this engine cooling device, the cooling water introduced from the cooling water inlet into the water jacket and bounced off from the spacer is generated around one of the upper and lower portions of the portion corresponding to the cooling water inlet of the spacer. The generation of the swirling flow can be prevented with a simple structure.

  According to a second aspect of the present invention, in the first aspect of the invention, the cooling water introduction port is provided at a position where a tangential direction and a cooling water introduction direction in a portion corresponding to the cooling water introduction port of the spacer intersect. It is characterized by that.

  The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the rectifying portion provided in the upper part is provided with a communication hole formed in a rectangular parallelepiped shape and communicating in the vertical direction.

  The invention of claim 4 is characterized in that, in the invention of claim 1 or 2, the rectifying portion provided in the lower part is composed of a plate-like guide part extending from the lower part to the upstream side in the introduction direction of the cooling water. Yes.

  According to a fifth aspect of the present invention, the spacer according to any one of the first to fourth aspects, wherein the spacer extends over the entire circumference along the vicinity of the upper end of the spacer and protrudes to the opposite side of the cylinder bore. A flange portion, a lower flange portion extending over the entire circumference along the lower portion of the spacer and extending to the opposite side of the cylinder bore; and the spacer formed between the upper flange portion and the lower flange portion A circulation part that circulates the cooling water flowing on the outer periphery of the spacer between the cylinder bores, and restricts the flow area of the cooling water flowing on the outer periphery of the spacer between the upper flange part and the lower flange part and passes through the circulation part The flow rate of the cooling water is increased.

  According to a sixth aspect of the present invention, in the first aspect of the present invention, the cylinder head side water jacket communicated with the water jacket, and the cooling for leading cooling water to the outside from the cylinder head side water jacket. A water outlet and a cooling water temperature detecting means provided downstream of the cooling water outlet, and switching the amount of cooling water introduced into the water jacket according to the cooling water temperature detected by the cooling water temperature detecting means. It is characterized by that.

  According to the first aspect of the present invention, the generation of the swirling flow around the horizontal axis that occurs in one of the upper part and the lower part of the part corresponding to the cooling water inlet of the spacer can be prevented with a simple structure. Therefore, it is possible to stabilize the flow of the cooling water by suppressing the turbulence generated in the flow of the cooling water, and to suppress the pressure loss of the cooling water introduced into the water jacket.

  According to the second aspect of the present invention, even when cooling water flows in a direction opposite to the specific arrangement direction of the cylinder bores and the specific arrangement direction of the cylinder bores, the cooling water is generated in the flow of the cooling water traveling in both directions. It is possible to suppress the turbulence and stabilize the flow of the cooling water, and to suppress the pressure loss of the cooling water introduced into the water jacket.

  According to the invention of claim 3, since the upper swirling flow around the horizontal axis of the cooling water is reliably dammed using a predetermined volume, the upper turbulence generated in the flow of the cooling water can be suppressed. The flow on the upper side of the can be stabilized. Further, it is possible to prevent the cooling water from flowing from the upper end of the spacer to the cylinder bore side.

  According to the invention of claim 4, since the lower swirling flow around the horizontal axis of the cooling water is effectively dammed, it is possible to suppress the lower turbulence generated in the flow of the cooling water, Can be stabilized. Further, it is possible to prevent the cooling water from flowing from the lower end portion of the spacer to the cylinder bore side.

  According to the invention of claim 5, it is possible to promote the temperature rise of the cylinder bore and to secure the amount of cooling water introduced between the cylinder bores.

  According to the sixth aspect of the present invention, since the amount of cooling water is controlled by the temperature, warm-up promotion and cooling promotion can be executed efficiently.

It is a longitudinal cross-sectional view of the engine cooling device according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of FIG. 1. It is a schematic block diagram of a cooling water path. It is a top view of a gasket. It is a principal part enlarged view of FIG. It is the figure which looked at the spacer from diagonally forward. It is the figure which looked at the spacer from diagonally backward. FIG. 7 is an enlarged view of a main part on the left side of FIG. 6. FIG. 7 is an enlarged view of a main part on the right side of FIG. 6. It is a front view of a spacer. It is a rear view of a spacer. It is a left view of a spacer. It is a right view of a spacer. It is a longitudinal cross-sectional view which shows the fluid analysis result of the flow distribution of the cooling water in the part corresponding to the cooling water inlet of the spacer which concerns on Example 1. FIG. It is a longitudinal cross-sectional view which shows the fluid analysis result of the flow distribution of the cooling water in the part corresponding to the cooling water inlet of the conventional spacer.

  Hereinafter, modes for carrying out the present invention will be described based on examples. In this embodiment, the cylinder head side is defined as the upper side, the crankcase side is defined as the lower side, the arrow F direction is defined as the front, and the arrow L direction is defined as the left.

Hereinafter, Example 1 of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, a multi-cylinder engine (hereinafter referred to as an engine) E according to this embodiment has four cylinders arranged in series in the crankshaft direction, and an intake system and an exhaust system are cylinders. This is an in-line four-cylinder engine arranged to face each other in the arrangement direction. This engine E1 is arranged in an engine room (not shown) at the front of the vehicle so that the cylinder arrangement direction is parallel to the vehicle width direction, the intake system faces the front of the vehicle body, and the cylinder shaft of each cylinder is vertically It is mounted to face the direction. In the following description, the first to fourth cylinders C1 to C4 will be described in order from the left side.

  The engine E includes a cylinder block 1 in which a water jacket 11 surrounding the cylinder bore 13 is formed, and a cylinder head 2 in which a water jacket 21 (head side water jacket) surrounding the intake port 22 and the exhaust port 23 is formed. A metal gasket 3 interposed between the cylinder block 1 and the cylinder head 2, a spacer 4 disposed in the water jacket 11, and the like.

First, the cylinder block 1 will be described.
As shown in FIGS. 1 to 3, the cylinder block 1 is formed of an aluminum alloy open deck cylinder block, and four cylinder liners 12 slidably receiving pistons (not shown) are provided in the left-right direction (cylinders). Siamese type cylinder liners linearly adjacent to each other in the arrangement direction) and four cylinder bores 13 respectively formed by the cylinder liners 12 are provided. The siamese type cylinder liner is integrally formed of cast iron and surrounded by an annular water jacket 11. The water jacket 11 has a substantially oval shape with constrictions at three locations corresponding to so-called siamese portions between the cylinder bores 13 adjacent to each other in plan view.

The cylinder block 1 is provided with a cooling water inlet 14 for introducing the cooling water into a position corresponding to the middle portion of the first cylinder C1 in the water jacket 11. The cooling water is introduced into the water jacket 11 from the outside of the cylinder block 1 by the water pump 81.
The cooling water introduction port 14 corresponds to a position where the tangential direction and the introduction direction of the cooling water in a portion corresponding to the cooling water introduction port 14 of the spacer 4 intersect, specifically, a position corresponding to the middle portion of the first cylinder C1. It is provided in the position which can introduce | transduce cooling water from the diagonally left front side with respect to the wall part of the spacer 4.

Therefore, the cooling water introduced into the water jacket 11 from the cooling water inlet 14 collides with the wall portion of the spacer 4 corresponding to the first cylinder C1 and bounces back, and then to the right which is the desired traveling direction. The cooling water is divided in two directions, ie, most of the cooling water flowing (for example, about 70%) and a part of the cooling water flowing to the left (for example, about 30%).
Note that the intersection angle between the tangential direction and the cooling water introduction direction in the portion corresponding to the cooling water introduction port 14 of the spacer 4 can be set as appropriate in accordance with the flow ratio of the cooling water based on the specifications of the engine E.

Next, the cylinder head 2 will be described.
As shown in FIGS. 1 to 3, the cylinder head 2 is made of an aluminum alloy, and intake / exhaust ports 22 and 23, plug ports 26, valve mechanisms and injectors (all not shown) for each of the cylinders C <b> 1 to C <b> 4. Etc.
The water jacket 21 is formed over the entire cylinder arrangement direction from the left end portion to the right end portion so as to cover the periphery of the intake / exhaust ports 22, 23, the plug port 26, etc. of the cylinders C1 to C4. The cylinder head 2 is provided with a cooling water inlet 24 for introducing cooling water from the water jacket 11 of the cylinder block 1 into the water jacket 21 of the cylinder head 2 at the left end, and from the water jacket 21 to the cylinder at the right end. A cooling water outlet 25 for leading cooling water to the outside of the head 2 is provided.

Next, the gasket 3 will be described.
As shown in FIG. 2, the sheet metal gasket 3 is overlaid on the upper end portion of the cylinder block 1 with the spacer 4 inserted in the water jacket 11 of the cylinder block 1, and the cylinder block 1 and the cylinder head 2 are connected to each other. It is fixed by fastening with a fastening bolt (not shown).

  As shown in FIGS. 4 and 5, the gasket 3 corresponds to the four bore openings 31 corresponding to the four cylinder bores 13, the plurality of bolt holes 32, and the cooling water inlet 24 of the cylinder head 2. A pair of front and rear cooling water openings 33 formed, three pairs of front and rear first communication portions 34 corresponding to the siamese portions between the cylinder bores 13, and the bore openings 31 of the cylinders C1 to C4. A plurality of circular second communication portions 35 formed on the rear side, a first bead portion 36 for sealing the outer edge portion of the gasket 3 over the entire circumference, and a seal around each bolt hole 32 And a plurality of second bead portions 37.

The plurality of second communication parts 35 are provided in the cylinder array orthogonal direction rear part of the bore openings 31 of the first to fourth cylinders C1 to C4. In the rear part of the bore opening 31 of the second and third cylinders C2 and C3, in addition to the second communication part 35 in the rear part of the cylinder arrangement orthogonal direction, a second communication part 35 is provided also in the vicinity of the left side thereof. It has been. In the rear portion of the bore opening 31 of the fourth cylinder C4, in addition to the second communication portion 35 in the rear portion in the cylinder arrangement orthogonal direction, second communication portions 35 are also provided in the vicinity of both sides in the left-right direction. . The cooling water opening 33 has a larger opening area than the first communication part 34 and the second communication part 35, and the total area formed by the pair of front and rear cooling water openings 33 is the first communication part 34 and the second communication part. It is set to be larger than the total area formed by the portion 35.
Accordingly, the cooling water of the water jacket 11 is caused to flow to the water jacket 21 through the pair of front and rear cooling water openings 33, the three pairs of front and rear first communication portions 34, and the plurality of second communication portions 35. The cooling performance of the cylinder head 2 can be maintained. Further, in order to flow a larger amount of cooling water from the pair of front and rear cooling water opening portions 33 than the first communication portion 34 and the second communication portion 35, the cooling water in the water jacket 11 is directed to the right which is a desired traveling direction. Can be guided.

Next, the spacer 4 will be described.
As shown in FIG. 1, the spacer 4 forms a flow path S (gap) for flowing cooling water between the outer periphery of the water jacket 11 surrounding the outer periphery of the cylinder bore 13.
The spacer 4 is made of a synthetic resin, such as polyamide-based thermoplastic resin (PA66, PPA, etc.), olefin-based thermoplastic resin (PP ) Etc. can be injection molded by combining one or more types, and glass fibers may be blended if necessary.

  As shown in FIG. 2 and FIG. 6 to FIG. 13, the spacer 4 includes a substantially oval main body wall portion 41 having constrictions at three positions corresponding to the siamese portion, and the main body wall portion 41 to the cylinder bore 13. An upper flange portion 42 projecting to the opposite side, a lower flange portion 43 projecting from the main body wall portion 41 to the opposite side to the cylinder bore 13 below the upper flange portion 42, and the lower flange portion 43 A stepped wall portion 44 formed below is provided.

  As shown in FIGS. 6 to 13, the main body wall portion 41 includes a rectifying portion 51 that extends obliquely leftward and forward from the upper portion of the portion corresponding to the cooling water introduction port 14 toward the upstream side in the cooling water introduction direction. A guide portion 52 that extends diagonally to the left forward from the lower portion of the portion corresponding to the water inlet 14 toward the upstream side in the direction of introduction of cooling water, and three constricted portions corresponding to the siamese portions between the cylinder bores 13 are formed. The six introduced portions 53 are provided.

  The rectifying unit 51 is provided in the vicinity of the upper end of the main body wall portion 41, and prevents the upward swirling flow around the horizontal axis that is generated when the cooling water introduced from the cooling water inlet 14 bounces off from the main body wall portion 41. ing. The rectifying unit 51 includes a wall 51a extending in the vertical direction facing the cooling water introduction direction, and is configured in a rectangular parallelepiped shape so as to occupy a predetermined volume. The rectifying unit 51 is formed in a bowl shape opened upward, and a communication hole 51b communicating in the vertical direction is provided on the bottom wall of the rectifying unit 51. As a result, the swirling flow in the vertical direction can be reliably dammed using a predetermined volume, so that there is no turbulence in the cooling water flowing to the right, and the damming of the swirling flow in the vertical direction is accompanied. Generation of pressure loss can be minimized.

As shown in FIGS. 6, 8, 10, and 12, the guide portion 52 is provided in the lower portion of the main body wall portion 41, and the cooling water introduced from the cooling water introduction port 14 rebounds from the main body wall portion 41. The generation of the lower swirling flow around the horizontal axis is prevented.
The guide part 52 is formed in a plate shape. As a result, the swirling flow in the vertical direction can be dammed with a simple structure, so that the disturbance of the cooling water flowing to the right can be suppressed.

Each introduction portion 53 is provided in the vicinity of the upper end of the main body wall portion 41, and actively induces cooling water flowing rightward to the siamese portion on the piston top dead center side close to the combustion chamber, whereby the cylinder block 1 Increased cooling efficiency. These introduction portions 53 are formed so as to be recessed from the main body wall portion 41 toward the cylinder bore 13 in a substantially wedge-shaped cross section.
As shown in FIGS. 6 to 11, a circulation portion 53 a is provided at the cylinder bore 13 side end portion of the introduction portion 53 for circulating cooling water flowing on the outer periphery of the spacer 4 between the adjacent cylinder bores 13. ing. The flow part 53 a is formed by partially cutting away the upper end part of the end part on the cylinder bore 13 side of the introduction part 53 at a position directly below the first communication part 34 formed in the gasket 3. Thereby, the cooling water that has passed through the circulation part 53a from the outer peripheral side of the spacer 4 flows horizontally to the siamese part between the cylinder bores 13, and then the cooling water that has cooled the siamese part via the first communication part 34 is the cylinder head. Guided to flow to 2.

  The upper flange portion 42 is connected to the upper end portion of the rectifying portion 51 and extends substantially horizontally along the upper end portion of the main body wall portion 41, and the upper wall of the flow path S for flowing cooling water and The upper wall of the introduction part 53 is formed. A vertical flange portion 61 extending upward is formed at the upper end of the upper flange portion 42. The vertical flange portion 61 is provided in the left side portion and the front portion of the first cylinder C1, the front portion of the second and third cylinders C2 and C3, a part of the front portion of the fourth cylinder C4, and the siamese portion between the cylinder bores 13, respectively. Is provided.

  As shown in FIG. 6 to FIG. 8 and FIG. 10 to FIG. 12, the vertical flange portion 61 at the left side portion of the first cylinder C1 is formed with a protruding portion 62 protruding to the left. The overhanging portion 62 is provided with a pair of front and rear openings 62 a corresponding to the pair of front and rear cooling water openings 33 formed in the gasket 3. The pair of front and rear openings 62a is configured by two large and small communication openings penetrating in the vertical direction. As a result, the coolant that flows clockwise around the cylinder bores 13 of the cylinders C1 to C4 and reaches the lower part of the overhanging part 62 and the outer periphery of the cylinder bore 13 of the first cylinder C1 flows counterclockwise and below the overhanging part 62. The cooling water that has reached 1 flows through the pair of openings 62 a and the pair of cooling water openings 33, and is introduced into the water jacket 21 of the cylinder head 2 from the cooling water inlet 24.

As shown in FIG. 5, a part of the vertical flange portion 61 is provided so as to correspond to the second communication portion 35 formed in the gasket 3, and a part of the upper end portion of the vertical flange portion 61 is connected to the second communication portion 35. It is disposed so as to be located on the cylinder bore 13 side with respect to the center of the portion 35.
Thereby, since the flow of the cooling water on the outer peripheral side of the spacer 4 can be promoted more than the flow of the cooling water on the inner peripheral side of the spacer 4, the flow rate of the cooling water flowing on the outer peripheral side of the spacer 4 is ensured. The cooling water which goes around from the lower end on the side to the inner peripheral side of the spacer 4 can be suppressed.

  As shown in FIGS. 6 to 13, the lower flange portion 43 is continuous with the upper end portion of the guide portion 52 and extends over the entire circumference along the lower portion of the main body wall portion 41 to flow the cooling water. A lower wall of the path S is formed. The lower flange portion 43 includes a first lower flange portion 43a corresponding to the first cylinder C1, a second lower flange portion 43b corresponding to the second to fourth cylinders C2 to C4, and a first lower flange portion. 43a and the 2nd lower side flange part 43b are provided with the front side inclination part 43c and the back side inclination part 43d.

  The first lower flange portion 43a extends substantially horizontally so as to surround the first cylinder C1 from the vicinity of the front side siamese part between the first cylinder C1 and the second cylinder C2 to the vicinity of the rear side siamese part. The lower flange portion 43b is located above the first lower flange portion 43a in the second to fourth cylinders C2 from the vicinity of the front siamese portion between the first cylinder C1 and the second cylinder C2 to the vicinity of the rear siamese portion. It extends substantially horizontally so as to surround ~ C4.

The front inclined portion 43c connects the front end portion of the first lower flange portion 43a and the front end portion of the second lower flange portion 43b in a substantially inclined shape. The rear inclined portion 43d connects the rear end portion of the first lower flange portion 43a and the rear end portion of the second lower flange portion 43b in a substantially inclined shape.
Thereby, the cooling water introduced into the water jacket 11 flows through the flow path S formed by the main body wall portion 41, the outer wall portion of the water jacket 11, the upper flange portion 42, and the lower flange portion 43. Further, most of the cooling water flowing to the right has its flow path area reduced as much as possible by the front inclined portion 43c, so that the flow rate of the cooling water is increased, thereby increasing the amount of cooling water guided to the circulation portion 53a. Has been.

The stepped wall portion 44 prevents a decrease in the flow rate of the cooling water flowing through the flow path S by narrowing a gap between the main body wall portion 41 and the outer wall portion of the water jacket 11.
The stepped wall portion 44 extends in the opposite direction to the cylinder bore 13 so as to approach the outer wall portion of the water jacket 11 from the lower end portion of the main body wall portion 41, and is formed between the main body wall portion 41 and the outer wall portion of the water jacket 11. It is formed so as to narrow the gap.
The stepped wall portion 44 includes a plurality of vertical ribs 71 and through holes 72 in the front side portion.

As shown in FIGS. 6 to 10, the plurality of vertical ribs 71 extend in the vertical direction so as to connect both from the upper end portion of the stepped wall portion 44 to the lower end portion of the lower flange portion 43. In the plurality of vertical ribs 71, the number of vertical ribs 71 (for example, 3) corresponding to the second cylinder C2 is larger than the number of vertical ribs 71 (for example, 2) corresponding to the third cylinder C3. The number of corresponding vertical ribs 71 is set to be larger than the number of vertical ribs 71 (for example, one) corresponding to the fourth cylinder C4.
The through-hole 72 is an opening for inserting a cold district engine heater (not shown). The through hole 72 is formed at a position corresponding to the lower front side of the fourth cylinder C4.

Next, the cooling water path of the cooling device for the engine E will be described.
This cooling water path is connected to a path L1 that connects the cooling water outlet 25 of the cylinder head 2 and the water pump 81 that supplies the cooling water to the cooling water inlet 14 of the cylinder block 1, and an intermediate part of the path L1. The valve unit 82, the temperature sensor 84a disposed in the path L1 downstream of the valve unit 82, the path L2 connecting the valve unit 82 and the introduction part of the radiator 83, the outlet part of the radiator 83, and the temperature A path L3 connecting the path L1 downstream from the sensor 84a, a temperature sensor 84b disposed in the path L3, and a path L4 connecting the path L3 downstream from the valve unit 82 and the temperature sensor 84b. ATF warmer 85 disposed in the middle of path L4 and auxiliary waterpo disposed in parallel with ATF warmer 85 in the middle of path L4 And a flop 86 and air-conditioning heater unit 87 and the like. The ATF warmer 85 is a heat exchange mechanism between the coolant and the automatic transmission oil (ATF).

The valve unit 82 includes a first flow rate control valve 88, a second flow rate control valve 89, and a thermostat valve 90 that are connected in parallel to the path L1.
The first and second flow control valves 88 and 89 are controlled by a control device (not shown), and control the amount of cooling water flowing based on the detection value of the temperature sensor 84a.
The thermostat valve 90 is set so as to open when the cooling water temperature becomes high, and provides a fer-safe mechanism when the first and second flow control valves 88 and 89 of the valve unit 82 fail in the fully closed state. It is composed. The lead-out part of the first flow control valve 88 and the lead-out part of the thermostat valve 90 are connected to the path L2, and the lead-out part of the second flow control valve 89 is connected to the path L4.

In the warm-up mode, the first and second flow control valves 88 and 89 and the thermostat valve 90 are closed to promote early warm-up of the engine. In this mode, the amount of cooling water circulating through the path L1 is suppressed.
In the semi-warm-up mode, the first flow rate control valve 88 and the thermostat valve 90 are closed, and the second flow rate control valve 89 is opened to promote early temperature rise of the cooling water.
In the complete warm-up mode, the first and second flow rate control valves 88 and 89 and the thermostat valve 90 are opened to maintain a stable cooling water temperature.

Next, operations and effects of the cooling device for the engine E according to the first embodiment will be described.
As shown in the fluid analysis result of the flow distribution of the cooling water in FIG. 14, according to the cooling device of the engine E, the rotation around the horizontal axis that occurs at the upper part and the lower part of the part corresponding to the cooling water inlet 14 of the spacer 4. Since the generation of the flow can be prevented with a simple structure, the turbulence generated in the flow of the cooling water traveling rightward and leftward is suppressed, the flow of the cooling water is stabilized, and the cooling water introduced into the water jacket 11 is stabilized. Pressure loss can be suppressed.

  Since the cooling water introduction port 14 is provided at a position where the tangential direction and the cooling water introduction direction in the portion corresponding to the cooling water introduction port 14 of the spacer 4 intersect each other, most of the cooling water is partly on the right side. The cooling water introduced into the water jacket 11 is stabilized by suppressing the turbulence generated in the flow of the cooling water traveling in both directions and stabilizing the flow of the cooling water. The pressure loss can be suppressed.

  The rectifying unit 51 provided in the upper part is provided with a communication hole 51b that is formed in a rectangular parallelepiped shape and communicates in the vertical direction. As a result, the upper swirling flow around the horizontal axis of the cooling water is reliably dammed using a predetermined volume, so that the upper turbulence generated in the flow of the cooling water can be suppressed, and the upper flow of the cooling water can be stabilized. Can be Moreover, the cooling water which goes around from the upper end part of the spacer 4 to the cylinder bore 13 side can be prevented.

  The rectification part provided in the lower part consists of the plate-shaped guide part 52 extended in the introduction direction of cooling water from the lower part. As a result, the lower swirling flow around the horizontal axis of the cooling water is efficiently blocked, so that the lower turbulence generated in the flow of the cooling water can be suppressed, and the lower flow of the cooling water is stabilized. be able to. Moreover, the cooling water which goes around from the lower end part of the spacer 4 to the cylinder bore 13 side can be prevented.

  The spacer 4 extends over the entire circumference along the vicinity of the upper end of the spacer 4 and extends to the opposite side of the cylinder bore 13, and extends over the entire circumference along the lower portion of the spacer 4. A lower flange portion 43 that projects to the opposite side of the cylinder bore 13, and a flow passage portion 53 a that is formed between the upper flange portion 42 and the lower flange portion 43 and that circulates the cooling water flowing on the outer periphery of the spacer 4 between the cylinder bores 13. And the upper flange portion 42 and the lower flange portion 43 limit the flow passage area of the cooling water flowing on the outer periphery of the spacer 4 to increase the flow velocity of the cooling water passing through the circulation portion 53a. Thereby, it is possible to promote the temperature rise of the cylinder bore 13 and secure the amount of cooling water introduced between the cylinder bores 13.

  A water jacket 21 on the cylinder head 2 side that communicates with the water jacket 11, a cooling water outlet 25 that extracts cooling water from the water jacket 21 to the outside, and a temperature provided downstream of the cooling water outlet 25 The amount of cooling water introduced into the water jacket 11 is switched according to the cooling water temperature detected by the temperature sensor 84a. Thereby, since the amount of cooling water is controlled by the cooling water temperature, warm-up promotion and cooling promotion can be executed efficiently.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above-described embodiment, the example in which the rectifying unit is provided in the upper part of the portion corresponding to the cooling water inlet of the spacer and the guide part as the rectifying unit is provided in the lower part has been described. The rectifying unit may be provided only on one side having a large pressure loss. In this case, the rectifying unit may be formed in a rectangular parallelepiped shape, or may be formed in a plate shape.

2] In the above embodiment, about 70% of the cooling water flows clockwise and the remaining about 30% flows counterclockwise. However, at least the tangential direction in the portion corresponding to the cooling water inlet of the spacer And the introduction direction of the cooling water may not be parallel, and the distribution ratio of the cooling water flowing counterclockwise may be larger than the distribution ratio of the cooling water flowing clockwise. The distribution ratio of the cooling water can be appropriately set according to the engine specifications.

3] In the above-described embodiment, an example of an in-line four-cylinder engine has been described. However, at least an engine having a water jacket for flowing cooling water in the cylinder arrangement direction can be applied. It can also be applied to engines and the like.

4) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention can suppress the pressure loss of the cooling water introduced into the water jacket in the engine cooling device provided with the spacer disposed in the water jacket of the cylinder block.

DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder head 4 Spacer 11 Water jacket 13 Cylinder bore 14 Cooling water inlet 21 (Cylinder head side) Water jacket 25 Cooling water outlet 42 Upper flange part 43 Lower flange part 51 Rectifying part 51b Communication hole 52 Guide part 53a Distribution part 84a Temperature sensor E Engine

Claims (6)

In an engine cooling device comprising a water jacket formed so as to surround a plurality of cylinder bores provided in a cylinder block, and a spacer disposed in the water jacket,
A cooling water inlet for introducing cooling water into the water jacket from the outside of the cylinder block;
A rectifying unit extending from one of an upper part and a lower part of a part corresponding to the cooling water introduction port of the spacer to the upstream side in the introduction direction of the cooling water, wherein the introduced cooling water flows along the spacer. And a rectifying unit that rectifies so as not to generate a swirling flow around the horizontal axis that is generated in the engine.   2. The engine according to claim 1, wherein the cooling water introduction port is provided at a position where a tangential direction in a portion corresponding to the cooling water introduction port of the spacer intersects the introduction direction of the cooling water. Cooling system.   The engine cooling device according to claim 1 or 2, wherein the rectifying unit provided in the upper part includes a communication hole formed in a rectangular parallelepiped shape and communicating in the vertical direction.   3. The engine cooling device according to claim 1, wherein the rectifying portion provided in the lower portion is a plate-shaped guide portion extending from the lower portion to the upstream side in the cooling water introduction direction. An upper flange portion extending over the entire circumference along the vicinity of the upper end of the spacer and extending to the opposite side of the cylinder bore; and a cylinder bore extending over the entire circumference along the lower portion of the spacer; A lower flange portion that projects to the opposite side, and a circulation portion that is formed between the upper flange portion and the lower flange portion and that circulates cooling water flowing around the outer periphery of the spacer between the cylinder bores,
The flow rate of the cooling water that passes through the circulation portion is increased by limiting the flow passage area of the cooling water that flows around the outer periphery of the spacer between the upper flange portion and the lower flange portion. The engine cooling device according to any one of the above. A cylinder head side water jacket communicated with the water jacket, a cooling water outlet port for leading cooling water from the cylinder head side water jacket to the outside, and a cooling water temperature detecting means provided downstream of the cooling water outlet port And
The engine cooling device according to any one of claims 1 to 5, wherein an amount of cooling water introduced into the water jacket is switched in accordance with a cooling water temperature detected by the cooling water temperature detecting means.