WO2020196375A1 - Cooling structure of internal combustion engine - Google Patents

Cooling structure of internal combustion engine Download PDF

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Publication number
WO2020196375A1
WO2020196375A1 PCT/JP2020/012640 JP2020012640W WO2020196375A1 WO 2020196375 A1 WO2020196375 A1 WO 2020196375A1 JP 2020012640 W JP2020012640 W JP 2020012640W WO 2020196375 A1 WO2020196375 A1 WO 2020196375A1
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WO
WIPO (PCT)
Prior art keywords
cooling
cooling jacket
control valve
block
cooling fluid
Prior art date
Application number
PCT/JP2020/012640
Other languages
French (fr)
Japanese (ja)
Inventor
正樹 長
美博 ▲高▼田
功 東垣外
Original Assignee
本田技研工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to JP2021509372A priority Critical patent/JP7075538B2/en
Publication of WO2020196375A1 publication Critical patent/WO2020196375A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/02—Cylinders; Cylinder heads  having cooling means
    • F02F1/10—Cylinders; Cylinder heads  having cooling means for liquid cooling

Definitions

  • a cylinder block having a cylinder bore is provided with a block-side cooling jacket arranged around the cylinder bore, and a combustion chamber facing the top of a piston slidably fitted to the cylinder bore is referred to as the cylinder block.
  • the cylinder head formed between the two and coupled to the cylinder block is provided with a head-side cooling jacket arranged around the combustion chamber, and the cooling fluid flows through the block-side cooling jacket and the head-side cooling jacket. It relates to a cooling structure of an internal combustion engine.
  • Patent Document 1 discloses a cooling structure of an internal combustion engine that adjusts the flow direction and flow rate of a cooling fluid in a cooling jacket provided on a cylinder block so as to be arranged around a plurality of cylinder bores arranged in parallel.
  • a valve discharges the cooling fluid from the block-side cooling jacket while allowing the cooling fluid to be supplied in parallel to the block-side cooling jacket provided on the cylinder block and the head-side cooling jacket provided on the cylinder head.
  • Patent Document 2 A cooling structure of an internal combustion engine is known in Patent Document 2 in which the amount of cooling fluid flowing through the block-side cooling jacket is controlled by control.
  • the present invention has been made in view of the above circumstances, and provides a cooling structure for an internal combustion engine in which the flow of the cooling fluid of the block-side cooling jacket provided in the cylinder block is variably controlled to improve the lubrication efficiency.
  • the purpose is to do.
  • the present invention provides a block-side cooling jacket arranged around the cylinder bore in a cylinder block having a cylinder bore, and faces the top of a piston slidably fitted to the cylinder bore.
  • a head-side cooling jacket arranged around the combustion chamber is provided on a cylinder head formed with a combustion chamber between the cylinder block and the cylinder head, and the block-side cooling jacket and the head are provided.
  • cooling by the block side cooling jacket is performed in a cooling fluid passage that guides the cooling fluid from the head side cooling jacket to the block side cooling jacket side.
  • the first feature is that a control valve for controlling the flow of fluid is provided.
  • the block-side cooling jacket is divided in a direction along the axis of the cylinder bore and from a plurality of divided cooling jackets that can communicate with each other in the cooling fluid passage.
  • the second feature is that it is formed.
  • the linear passage portion which constitutes a part of the cooling fluid passage and extends parallel to the axis of the cylinder bore, the axial direction of the linear passage portion.
  • the third feature is that the control valve extending to is inserted.
  • the fourth feature of the present invention is that, in addition to any of the configurations of the first to third features, the control valve is provided with a notch in the rod-shaped control valve main portion.
  • control valve is connected to an actuator capable of moving the control valve in the axial direction of the linear passage portion. It is a feature of.
  • control valve in addition to the configuration of the second or third feature, is connected to an actuator capable of rotating the control valve around the axis in the linear passage portion. It is a feature.
  • a control valve for controlling the flow of the cooling fluid in the block side cooling jacket is provided in the cooling fluid passage that guides the cooling fluid from the head side cooling jacket to the block side cooling jacket side. Therefore, it is possible to control the flow of the cooling fluid in the block-side cooling jacket according to the operating state including the starting state of the internal combustion engine, and the temperature of the cylinder block is appropriately controlled according to the operating state to achieve lubrication efficiency. Can be improved.
  • the block-side cooling jacket is composed of a plurality of divided cooling jackets that are divided in the direction along the axis of the cylinder bore and can communicate with each other, a plurality of cooling jackets along the axis of the cylinder bore are formed.
  • the temperature at the site can be changed according to the operating condition.
  • the control valve extending in the axial direction of the passage portion is inserted into the linear passage portion which is arranged parallel to the axis of the cylinder bore and forms a part of the cooling fluid passage. ,
  • the arrangement of the control valve becomes simple.
  • the structure of the control valve can be simplified by configuring the control valve so that the rod-shaped control valve main portion is provided with a notch.
  • the cooling fluid can be controlled with a simple structure by moving the control valve in the axial direction of the linear passage portion by the actuator.
  • the cooling fluid can be controlled with a simple structure by rotating the control valve in the linear passage portion by the actuator.
  • FIG. 1 is a vertical sectional view of a main part of the internal combustion engine according to the first embodiment.
  • FIG. 2 is a diagram showing a configuration of a cooling system of the engine body.
  • FIG. 3 is a cross-sectional view taken along the line aa of FIG. 1 when the internal combustion engine is started.
  • FIG. 4 is a sectional view taken along line bb of FIG. 1 when the internal combustion engine is started.
  • FIG. 5 is a diagram showing the operating state of the control valve at the start state of the internal combustion engine through the block side cooling jacket and the cooling fluid passage.
  • FIG. 1 is a vertical sectional view of a main part of the internal combustion engine according to the first embodiment.
  • FIG. 2 is a diagram showing a configuration of a cooling system of the engine body.
  • FIG. 3 is a cross-sectional view taken along the line aa of FIG. 1 when the internal combustion engine is started.
  • FIG. 4 is a sectional view taken along line bb of FIG. 1 when the
  • FIG. 6 is a diagram showing simplified cross sections along lines aa, bb, and cc of FIG. 1 at the time of starting the internal combustion engine with (a), (b), and (c). .. (First Embodiment)
  • FIG. 7 is a diagram showing simplified cross sections along lines aa, bb, and cc of FIG. 1 during medium load operation of an internal combustion engine, as shown by (a), (b), and (c).
  • FIG. 8 is a diagram showing simplified cross sections along lines aa, bb, and cc of FIG. 1 during high-load operation of an internal combustion engine, as shown by (a), (b), and (c). Is. (First Embodiment) FIG.
  • FIG. 9 is a vertical cross-sectional view of a main part of the internal combustion engine of the second embodiment.
  • FIG. 10 is a diagram showing the operating state of the control valve at the start state of the internal combustion engine through the block side cooling jacket and the cooling fluid passage.
  • FIG. 11 is a perspective view of the control valve as viewed from the side opposite to that of FIG.
  • FIG. 12 is a diagram showing simplified cross sections taken along the lines aa and bb of FIG. 9 when the internal combustion engine is started, as shown in (a) and (b).
  • FIG. 13 is a diagram showing simplified cross sections taken along the lines aa and bb of FIG. 9 during high-load operation of the internal combustion engine in FIGS. 9A and 13B.
  • the internal combustion engine EA is mounted on, for example, a motorcycle, and the engine body 11A is a crankcase (not shown).
  • a cylinder block 12 that is tilted forward and coupled to the crankcase while mounted on a motorcycle, a cylinder head 13 that is coupled to the cylinder block 12, and a head cover 14 that is coupled to the cylinder head 13. It has and is configured as a single cylinder.
  • the cylinder block 12 has an axis C that is inclined forward when mounted on a motorcycle, and also has a cylinder bore 16 that slidably fits the piston 15. Combustion that faces the top of the piston 15.
  • a chamber 17 is formed between the cylinder block 12 and the cylinder head 13.
  • An intake port 18 that can communicate with the combustion chamber 17 is provided on the rear side wall 13a of the cylinder head 13, a throttle body 21 is connected to the intake port 18 via an insulator 20, and fuel is supplied to the throttle body 21.
  • An injection valve 22 is attached.
  • the front side wall 13b of the cylinder head 13 is provided with an exhaust port 19 that can communicate with the combustion chamber 17.
  • the cylinder head 13 includes an intake valve 24 that controls the intake amount from the intake port 18 to the combustion chamber 17, and an exhaust valve 25 that controls the exhaust amount from the combustion chamber 17 to the exhaust port 19. , Each is arranged so that it can be opened and closed while being spring-forced on the valve closing side.
  • the intake valve 24 is opened and closed by an intake side valve device 26 arranged between the cylinder head 13 and the head cover 14, and the intake side valve device 26 is a valve shaft of the intake valve 24.
  • An intake valve side cap 27 that comes into contact with the portion 24a and is slidably fitted to the cylinder head 13 and an intake side camshaft 28 that is rotatably supported by the cylinder head 13 are provided.
  • the camshaft 28 is provided with an intake side cam 29 that is in sliding contact with the intake valve side cap 27.
  • the exhaust valve 25 is opened and closed by an exhaust side valve device 30 arranged between the cylinder head 13 and the head cover 14, and the exhaust side valve device 30 is a valve of the exhaust valve 25.
  • An exhaust valve side cap 31 that comes into contact with the shaft portion 25a and is slidably fitted to the cylinder head 13 and an exhaust side camshaft 32 that is rotatably supported by the cylinder head 13 are provided.
  • the side camshaft 32 is provided with an exhaust side cam 33 that is in sliding contact with the exhaust valve side cap 31.
  • the engine body 11A has a cooling jacket 34 for cooling the engine body 11A by the flow of a cooling fluid such as water or gas, and the cooling jacket 34 has the cylinder bore.
  • a block-side cooling jacket 35 provided on the cylinder block 12 so as to be arranged around the 16 and a head-side cooling jacket 36 provided on the cylinder head 13 so as to be arranged around the combustion chamber 17.
  • a cooling fluid such as water or gas
  • the cooling fluid discharged from the cooling fluid circulation pump 37 that circulates the cooling fluid is supplied to the head-side cooling jacket 36, and is cooled from the head-side cooling jacket 36 to the block-side cooling jacket 35 via the cooling fluid passage 38. Although the fluid is guided, the flow of the cooling fluid to the block-side cooling jacket 35 is controlled by the control valve 39 provided in the cooling fluid passage 38, and the cooling fluid after being controlled by the control valve 39 is a radiator. It is returned to the cooling fluid circulation pump 37 via 40.
  • the cooling fluid passage 38 guides the cooling fluid from the head-side cooling jacket 36 to the block-side cooling jacket 35 side, and at least the cooling fluid passage 38.
  • a part is provided on the cylinder block 12 and the cylinder head 13.
  • the block-side cooling jacket 35 is composed of a plurality of divided cooling jackets that are divided in the direction along the axis C of the cylinder bore 16 and that can communicate with each other in the cooling fluid passage 38.
  • the first divided cooling jacket 35a, the second divided cooling jacket 35b, and the third divided cooling jacket 35c arranged in order from the cylinder head 13 side in the direction along the axis C of the cylinder bore 16 are formed in a ring shape surrounding the cylinder bore 16.
  • the cylinder block 12 is provided so as to be evenly spaced from each other.
  • the cylinder block 12 has a structure having a hollow space by having the above-mentioned first to third divided cooling jackets 35a, 35b, 35c, and is manufactured by using a 3D printer or the like, and the first to third divided cooling jackets 35a.
  • the cylinder block 12 having the first to third divided cooling jackets 35a, 35b, 35c can be formed.
  • the cooling fluid passage 38 traverses a part of the first split cooling jacket 35a, the second split cooling jacket 35b, and the third split cooling jacket 35c in the circumferential direction, and the cylinder bore 16 In the first split cooling jacket 35a while guiding the cooling fluid from the head side cooling jacket 36 and the linear passage portion 38a provided in the cylinder block 12 and the cylinder head 13 extending in parallel with the axis C of the above.
  • An introduction passage 38b whose downstream end opens on the inner surface of the linear passage 38a at a corresponding position, and one end on the inner surface of the linear passage 38a at a position facing the opening end of the introduction passage 38b.
  • a first detour passage that opens and extends so as to bypass a part of the linear passage portion 38a and opens the other end portion on the inner surface of the linear passage portion 38a at a portion corresponding to the second split cooling jacket 35b.
  • One end is opened on the inner surface of the linear passage 38a at a position facing the other end opening of the first detour passage 38c and the portion 38c, and extends so as to bypass a part of the linear passage 38a.
  • the second detour passage portion 38d that opens the other end portion on the inner surface of the linear passage portion 38a at the portion corresponding to the third division cooling jacket 35c and the other end opening portion of the second detour passage portion 38d are opposed to each other. It is composed of a discharge passage portion 38e that opens one end on the inner surface of the linear passage portion 38a at such a position, and the other end of the discharge passage portion 38e is connected to the radiator 40.
  • the introduction passage portion 38b, the first detour passage portion 38c, the second detour passage portion 38d, and the discharge passage portion 38e are such that at least a part of 38b, 38c, 38d, 38e is the cylinder block 12 and the cylinder. It may be composed of a conduit separate from the head 13.
  • the control valve 39 constitutes a part of the cooling fluid passage 38 and extends in the axial direction of the linear passage portion 38a extending in parallel with the axis C of the cylinder bore 16, and is inside the linear passage portion 38a. Will be inserted into.
  • the control valve 39 is formed by providing first, second and third notches 41, 42 and 43 in a rod-shaped control valve main portion 39a, and the first and second notches 41 are provided. , 42 are arranged on both sides of the one-diameter line DL1 of the control valve main portion 39a so as to cut out a part of the control valve main portion 39a in an arc shape. Further, the third notch 43 is formed so as to cut out a half portion of the control valve main portion 39a in the direction along the one-diameter line DL1.
  • the control valve 39 having such a shape may be manufactured by using a 3D printer or the like.
  • the first and second notches 41 and 42 have a first predetermined length L1 in a direction along the axis of the control valve main portion 39a from the end portion of the control valve main portion 39a on the cylinder head 13 side.
  • the first predetermined length L1 is formed so as to have, and the first predetermined length L1 is opposite to the cylinder head 13 of the third divided cooling jacket 35c from the end portion of the first divided cooling jacket 35a on the cylinder head 13 side. It is set to the length to the end of the side.
  • the third notch 43 is spaced from the first notch 41 and the second notch 42 by a second predetermined length L2 in a direction along the axis of the control valve main portion 39a. It is arranged at a position farther from the cylinder head 13 than the first and second notches 41 and 42 at the above position, and has a third predetermined length L3 in the direction along the axis of the control valve main portion 39a. It is formed on the control valve main portion 39a.
  • the second predetermined length L2 is the spacing between the first split cooling jacket 35a and the second split cooling jacket 35b, and the spacing between the second split cooling jacket 35b and the third split cooling jacket 35c. It is set corresponding to.
  • the third predetermined length L3 is a length from the end of the second divided cooling jacket 35b on the side opposite to the cylinder head 13 to the end of the third divided cooling jacket 35c on the opposite side of the cylinder head 13. Is set to.
  • the control valve 39 is arranged so that the one-diameter line DL1 of the control valve main portion 39a is located along the radial direction of the first to third divided cooling jackets 35a, 35b, 35c having a ring shape. It is inserted into the linear passage portion 38a.
  • the first notch 41 and the second notch 42 are present only at positions corresponding to the first divided cooling jacket 35a in the linear passage portion 38a, and the third notch 43 is the second.
  • the split cooling jacket 35b and the third split cooling jacket 35c are located at positions corresponding to the split cooling jacket 35c, one location in the circumferential direction of the first split cooling jacket 35a is the control, as clearly shown in FIGS. 3 and 6A.
  • the introduction passage portion 38b of the cooling fluid passage 38 is communicated with the peripheral end portion of the first divided cooling jacket 35a in a blocked state by the valve main portion 39a via the first notch 41.
  • the other end in the circumferential direction of the first divided cooling jacket 35a is communicated with one end of the first detour passage 38c in the cooling fluid passage 38 via the second notch 42.
  • the second divided cooling jacket 35b is blocked from the cooling fluid passage 38 by the control valve main portion 39a, and the first detour passage portion 38c and the second detour passage 38c.
  • the portion 38d is communicated through the third notch 43.
  • the third divided cooling jacket 35c is blocked from the cooling fluid passage 38 by the control valve main portion 39a, and the second detour passage portion 38d and the discharge passage portion 38e are separated from each other. It is communicated through the third notch 43.
  • the first notch 41 and the second notch 42 are located in the linear passage portion 38a at positions corresponding to the first divided cooling jacket 35a and the second divided cooling jacket 35b, and the third divided cooling is performed.
  • the third notch 43 is present at a position corresponding to the jacket 35c, as shown in FIG. 7A, one location in the circumferential direction of the first divided cooling jacket 35a is blocked by the control valve main portion 39a.
  • One end in the circumferential direction of the first divided cooling jacket 35a in a blocked state is communicated with the introduction passage portion 38b via the first notch 41, and the circumferential direction of the first divided cooling jacket 35a and the like. The end is communicated with the second notch 42. Further, as shown in FIG.
  • one location in the circumferential direction of the second split cooling jacket 35b is blocked by the control valve main portion 39a, and one end in the circumferential direction of the second split cooling jacket 35b in the blocked state.
  • the first split cooling jacket 35a is communicated through the second notch 42, and the other end in the circumferential direction of the second split cooling jacket 35b is one end of the second detour passage portion 38d via the first notch 41. Is communicated with.
  • the third split cooling jacket 35c is blocked from the linear passage portion 38a by the control valve main portion 39a, and the second detour passage portion 38d is cut off from the third cut. It is communicated with the discharge passage portion 38e via the notch 43.
  • one location in the circumferential direction of the second split cooling jacket 35b is cut off by the control valve main portion 39a, and one end in the circumferential direction of the second split cooling jacket 35b in the cut state.
  • the first split cooling jacket 35a is communicated through the second notch 42, and the other end in the circumferential direction of the second split cooling jacket 35b is one end of the second detour passage portion 38d via the first notch 41. Is communicated with.
  • one location in the circumferential direction of the third divided cooling jacket 35c is cut off by the control valve main portion 39a, and one end in the circumferential direction of the third divided cooling jacket 35c in the blocked state.
  • the first divided cooling jacket 35a and the second divided cooling jacket 35b are communicated with each other through the first notch 41, and the other end of the third divided cooling jacket 35c in the circumferential direction is connected to one end of the discharge passage portion 38e. Be communicated.
  • an actuator 44 capable of moving the control valve 39 in the linear passage portion 38a in the axial direction is connected to the control valve 39, and the actuator 44 is, for example, a wax whose volume is changed according to temperature. It may be made of a material containing a thermosoft material such as, or may have an electric motor.
  • the control valve 39 is driven by the actuator 44, so that when the internal combustion engine EA is started, the first and second notches 41 are shown in FIGS. 6A, 6B, and 6C. , 42 correspond to the first split cooling jacket 35a and the third notch 43 corresponds to the second and third split cooling jackets 35b, 35c.
  • FIG. 7 As shown by a), (b), and (c), the first and second notches 41 and 42 correspond to the first and second divided cooling jackets 35a and 35b, and the third notch 43 is the third.
  • the position corresponds to the 3-split cooling jacket 35c, and during high-load operation of the internal combustion engine EA, the first and second notches 41 and 42 are shown in FIGS. 8 (a), 8 (b) and 8 (c). Is the position corresponding to the first, second and third divided cooling jackets 35a, 35b and 35c.
  • the cooling fluid derived from the head side jacket 36 circulates only in the first divided cooling jacket 35a of the block side jacket 35, and the second and third divided cooling jackets 35b and 35c. Will be bypassed, and during the medium load operation of the internal combustion engine EA, the cooling fluid derived from the head side jacket 36 flows only through the first and second split cooling jackets 35a and 35b of the block side jacket 35. Then, the third split cooling jacket 35c is bypassed, and during the high load operation of the internal combustion engine EA, the cooling fluid derived from the head side jacket 36 is the first, second and second of the block side jacket 35.
  • the three-piece cooling jackets 35a, 35b, and 35c will be distributed in order.
  • the block-side cooling jacket 35 is divided in a direction along the axis C of the cylinder bore 16 included in the cylinder block 12, and a plurality of divided cooling jackets that can communicate with each other in the cooling fluid passage 38, in this embodiment. Since it is composed of the first, second and third divided cooling jackets 35a, 35b and 35c, the temperature at a plurality of portions along the axis C of the cylinder bore 16 can be changed according to the operating state.
  • control valve 39 extending in the axial direction of the linear passage 38a is inserted into the linear passage 38a which constitutes a part of the cooling fluid passage 38 and extends parallel to the axis C of the cylinder bore 16. Therefore, the arrangement of the control valve 39 becomes simple.
  • control valve 39 is simplified by providing the control valve main portion 39a, which has a rod shape, with first, second and third notches 41, 42 and 43. Can be done.
  • the actuator 44 capable of moving the control valve 39 in the axial direction of the linear passage portion 38a is connected to the control valve 39, the cooling fluid can be controlled with a simple structure.
  • FIGS. 9 to 13 A second embodiment of the present invention will be described with reference to FIGS. 9 to 13, but the parts corresponding to the first embodiment are only shown with the same reference numerals and are detailed. The description is omitted.
  • the engine body 11B of the internal combustion engine EB has a cooling jacket 48 for cooling the engine body 11B by the flow of a cooling fluid such as water or gas, and the cooling jacket 48 is the cylinder bore 16.
  • a block-side cooling jacket 49 provided on the cylinder block 12B so as to be arranged around the combustion chamber 17 and a head-side cooling jacket 36 provided on the cylinder head 13 so as to be arranged around the combustion chamber 17 are provided.
  • the cooling fluid discharged from the cooling fluid circulation pump 37 (see the first embodiment) that circulates the cooling fluid is supplied to the head-side cooling jacket 36, and the head-side cooling is performed.
  • the cooling fluid is guided from the jacket 36 to the block-side cooling jacket 49 side via the cooling fluid passage 50, and the flow of the cooling fluid to the block-side cooling jacket 49 is a control valve 51 provided in the cooling fluid passage 50.
  • the cooling fluid which is controlled by the control valve 51 and then controlled by the control valve 51, is returned to the cooling fluid circulation pump 37 via the radiator 40 (see the first embodiment).
  • the cooling fluid passage 50 guides the cooling fluid from the head-side cooling jacket 36 to the block-side cooling jacket 49 side, and at least a part of the cooling fluid passage 50 is the cylinder block 12B and the cylinder head. It is provided in 13.
  • the block-side cooling jacket 49 is composed of a plurality of divided cooling jackets that are divided along the axis C of the cylinder bore 16 and that can communicate with each other in the cooling fluid passage 50.
  • the block-side cooling jacket 49 is composed of a plurality of divided cooling jackets.
  • the first split cooling jacket 49a and the second split cooling jacket 49b which are arranged in order from the cylinder head 13 side in the direction along the axis C of the cylinder bore 16, are formed in a ring shape surrounding the cylinder bore 16 and are evenly spaced from each other. It is provided on the cylinder block 12B so as to be open.
  • the cylinder block 12B has a structure having a hollow space by having the above-mentioned first and second divided cooling jackets 49a and 49b, and is manufactured by using a 3D printer or the like, and the first and second divided cooling jackets 49a and 49b. By casting a member that constitutes a space corresponding to the above, the cylinder block 12B having the first and second divided cooling jackets 49a and 49b can be formed.
  • the cooling fluid passage 50 extends in parallel with the axis C of the cylinder bore 16 while traversing a part of the circumferential direction of the first divided cooling jacket 49a and the second divided cooling jacket 49b, and the cylinder block 12B and the said. Downstream to the inner surface of the linear passage portion 50a at a position corresponding to the first divided cooling jacket 49a while guiding the cooling fluid from the head side cooling jacket 36 and the linear passage portion 50a provided on the cylinder head 13.
  • the discharge passage portion 50c is composed of an introduction passage portion 50b having an open end portion and a discharge passage portion 50c having one end opened on the inner surface of the linear passage portion 50a at a portion corresponding to the second divided cooling jacket 49b.
  • the other end of the radiator 40 is connected to the radiator 40.
  • At least a part of the introduction passage portion 50b and the discharge passage portion 50c may be formed of a conduit separate from the cylinder block 12B and the cylinder head 13.
  • the control valve 51 constitutes a part of the cooling fluid passage 50 and extends in the axial direction of the linear passage portion 50a extending in parallel with the axis C of the cylinder bore 16, and is inside the linear passage portion 50a. Will be inserted into.
  • control valve 51 is provided with fourth to eighth notches 52, 53, 54, 55, 56 and a passage hole 57 in a rod-shaped control valve main portion 51a. It may be manufactured by using, for example, a 3D printer or the like.
  • the fourth and fifth notches 52 and 53 have a fan-shaped cross-sectional shape and are arranged on both sides of the one-diameter line DL2 of the control valve main portion 51a.
  • the sixth and seventh notches 54 and 55 are such that the sixth notch 54 is adjacent to the fifth notch 53 and the seventh notch 55 is adjacent to the fourth notch 52. It has a fan-shaped cross-sectional shape and is arranged on both sides of the one-diameter line DL2.
  • the eighth notch 56 is controlled at a position spaced axially from the sixth notch 54 while having a fan-shaped cross-sectional shape corresponding to the sixth notch 54. It is provided on the valve main portion 51a.
  • the fourth notch 52, the fifth notch 53, and the sixth notch 54 are formed in the first divided cooling jacket of the block-side cooling jacket 49 in the axial direction of the control valve main portion 51a. It is arranged at a position corresponding to the above, and is formed so as to have a length corresponding to the first divided cooling jacket 49a in the axial direction of the control valve main portion 51a. Further, the seventh notch 55 is formed from the end of the first divided cooling jacket 49a on the side of the cylinder head 13 to the second divided cooling jacket with the cylinder head 13 of 49b in the axial direction of the control valve main portion 51a.
  • the eighth notch 56 is arranged at a position corresponding to 49a in the second split cooling jacket in the axial direction of the control valve main portion 51a. It is formed so as to have a length corresponding to the second split cooling jacket 49b in the axial direction of the control valve main portion 51a.
  • one end 57a of the passage hole 57 is opened in the fifth notch 53, and the other end 57b of the passage hole 57 is opened on the outer periphery of the control valve main portion 51a.
  • the other end 57b of the passage hole 57 is a position corresponding to the fourth notch 52 in the circumferential direction of the control valve main portion 51a, and the second end portion 57b in the axial direction of the control valve main portion 51a. It is arranged at a position corresponding to the split cooling jacket 49b.
  • control valve 51 is connected to an actuator 58 capable of rotating the control valve 51 around the axis in the linear passage portion 50a, and the actuator 58 changes the volume according to, for example, the temperature. It may be composed of a material containing a heat-soft material such as wax, or may have an electric motor.
  • the control valve 51 is driven by the actuator 58, and when the internal combustion engine EB is started, the fourth and fifth notches 52 and 53 are made into the fourth and fifth notches 52 and 53 as shown in FIGS. 12 (a) and 12 (b). It corresponds to the 1-split cooling jacket 49a and is a position where a part of the 2nd split cooling jacket 49b in the circumferential direction is blocked by the control valve main portion 51a.
  • the cooling fluid from the head-side cooling jacket 36 flows from the introduction passage portion 50b through the fourth notch 52 in the first divided cooling jacket 49a, and from the fifth notch 53 through the passage hole 57. It will flow to the discharge passage portion 50c side. That is, when the internal combustion engine EB is started, the cooling fluid derived from the head side jacket 36 circulates only in the first division cooling jacket 49a of the block side jacket 49, and the second division cooling jacket 49b is bypassed. ..
  • the control valve 51 is rotated 180 degrees from the starting position by the actuator 58, and as shown in FIGS. 13A and 13B, the sixth notch is formed.
  • the 54 corresponds to the first divided cooling jacket 49a
  • the seventh notch 55 corresponds to the first and second divided cooling jackets 49a and 49b
  • the eighth notch 56 corresponds to the second divided cooling jacket 49b. It will be the position to let.
  • the cooling fluid from the head-side cooling jacket 36 is supplied from the introduction passage portion 50b to the fourth notch 52, the first divided cooling jacket 49a, the seventh notch 55, the second divided cooling jacket 49b, and the eighth. It will flow into the discharge passage 50c through the notch 56. That is, during high-load operation of the internal combustion engine EB, the cooling fluid derived from the head-side jacket 36 circulates in order through the first and second split cooling jackets 49a and 49b of the block-side jacket 49.
  • the block side cooling jacket 35 is divided into the first to third divided cooling jackets 35a, 35b, 35c, and the block side cooling jacket 49 is divided into the first and second divided cooling jackets 49a, 49b.
  • it may be divided into four or more divided cooling jackets.
  • the plurality of divided cooling jackets may be constantly communicated with each other through a small flow cooling fluid passage with a reduced flow rate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

Provided is a cooling structure of an internal combustion engine in which a cylinder block comprises a block-side cooling jacket, a cylinder head comprises a head-side cooling jacket, and a cooling fluid is distributed to the block-side cooling jacket and the head-side cooling jacket, wherein a control valve (39), which controls the distribution of the cooling fluid in the block-side cooling jacket (35), is provided to a cooling fluid passage (38) that guides the cooling fluid from the head-side cooling jacket (36) toward the block-side cooling jacket (35). Due to this configuration, the distribution of the cooling fluid in the block-side cooling jacket is variably controlled so as to improve lubrication efficiency.

Description

内燃機関の冷却構造Internal combustion engine cooling structure
　本発明は、シリンダボアを有するシリンダブロックに前記シリンダボアの周囲に配置されるブロック側冷却ジャケットが設けられ、前記シリンダボアに摺動自在に嵌合されるピストンの頂部を臨ませる燃焼室を前記シリンダブロックとの間に形成して当該シリンダブロックに結合されるシリンダヘッドに、前記燃焼室の周囲に配置されるヘッド側冷却ジャケットが設けられ、前記ブロック側冷却ジャケットおよび前記ヘッド側冷却ジャケットに冷却流体を流通させるようにした内燃機関の冷却構造に関する。 In the present invention, a cylinder block having a cylinder bore is provided with a block-side cooling jacket arranged around the cylinder bore, and a combustion chamber facing the top of a piston slidably fitted to the cylinder bore is referred to as the cylinder block. The cylinder head formed between the two and coupled to the cylinder block is provided with a head-side cooling jacket arranged around the combustion chamber, and the cooling fluid flows through the block-side cooling jacket and the head-side cooling jacket. It relates to a cooling structure of an internal combustion engine.
　並列配置される複数のシリンダボアの周囲に配置されるようにしてシリンダブロックに設けられる冷却ジャケットでの冷却流体の流れ方向および流量を調整するようにした内燃機関の冷却構造が、特許文献１で知られており、またシリンダブロックに設けられるブロック側冷却ジャケットならびにシリンダヘッドに設けられるヘッド側冷却ジャケットに並列に冷却流体を供給することを可能としつつブロック側冷却ジャケットからの冷却流体の排出を弁で制御することによってブロック側冷却ジャケットを流通する冷却流体量を制御するようにした内燃機関の冷却構造が、特許文献２で知られている。 Patent Document 1 discloses a cooling structure of an internal combustion engine that adjusts the flow direction and flow rate of a cooling fluid in a cooling jacket provided on a cylinder block so as to be arranged around a plurality of cylinder bores arranged in parallel. A valve discharges the cooling fluid from the block-side cooling jacket while allowing the cooling fluid to be supplied in parallel to the block-side cooling jacket provided on the cylinder block and the head-side cooling jacket provided on the cylinder head. A cooling structure of an internal combustion engine is known in Patent Document 2 in which the amount of cooling fluid flowing through the block-side cooling jacket is controlled by control.
日本特開２０１０－１６４００６号公報Japanese Patent Application Laid-Open No. 2010-164006 日本特表２０１６－５３４２８３号公報Japan Special Table 2016-534283 Gazette
　ところで内燃機関の始動直後の潤滑効率低下を避けるためには、始動時に冷却流体によって機関本体が過度に冷却されないようにすることが必要であるが、上記特許文献１および特許文献２で開示された技術では、潤滑効率の向上を図るには不充分であり、内燃機関の始動直後の潤滑効率の向上をさらに図るために、シリンダブロックに設けられるブロック側冷却ジャケットでの冷却流体の流通を可変制御する冷却構造を実現することが望まれている。 By the way, in order to avoid a decrease in lubrication efficiency immediately after starting an internal combustion engine, it is necessary to prevent the engine body from being excessively cooled by the cooling fluid at the time of starting, which has been disclosed in Patent Documents 1 and 2. The technology is insufficient to improve the lubrication efficiency, and in order to further improve the lubrication efficiency immediately after the start of the internal combustion engine, the flow of the cooling fluid is variably controlled by the block-side cooling jacket provided in the cylinder block. It is desired to realize a cooling structure.
　本発明は、かかる事情に鑑みてなされたものであり、シリンダブロックに設けられるブロック側冷却ジャケットの冷却流体の流通を可変制御して潤滑効率の向上を図るようにした内燃機関の冷却構造を提供することを目的とする。 The present invention has been made in view of the above circumstances, and provides a cooling structure for an internal combustion engine in which the flow of the cooling fluid of the block-side cooling jacket provided in the cylinder block is variably controlled to improve the lubrication efficiency. The purpose is to do.
　上記目的を達成するために、本発明は、シリンダボアを有するシリンダブロックに前記シリンダボアの周囲に配置されるブロック側冷却ジャケットが設けられ、前記シリンダボアに摺動自在に嵌合されるピストンの頂部を臨ませる燃焼室を前記シリンダブロックとの間に形成して当該シリンダブロックに結合されるシリンダヘッドに、前記燃焼室の周囲に配置されるヘッド側冷却ジャケットが設けられ、前記ブロック側冷却ジャケットおよび前記ヘッド側冷却ジャケットに冷却流体を流通させるようにした内燃機関の冷却構造において、前記ヘッド側冷却ジャケットからの冷却流体を前記ブロック側冷却ジャケット側に導く冷却流体通路に、前記ブロック側冷却ジャケットでの冷却流体の流通を制御する制御弁が設けられることを第１の特徴とする。 In order to achieve the above object, the present invention provides a block-side cooling jacket arranged around the cylinder bore in a cylinder block having a cylinder bore, and faces the top of a piston slidably fitted to the cylinder bore. A head-side cooling jacket arranged around the combustion chamber is provided on a cylinder head formed with a combustion chamber between the cylinder block and the cylinder head, and the block-side cooling jacket and the head are provided. In the cooling structure of an internal combustion engine in which a cooling fluid is allowed to flow through a side cooling jacket, cooling by the block side cooling jacket is performed in a cooling fluid passage that guides the cooling fluid from the head side cooling jacket to the block side cooling jacket side. The first feature is that a control valve for controlling the flow of fluid is provided.
　また本発明は、第１の特徴の構成に加えて、前記ブロック側冷却ジャケットは、前記シリンダボアの軸線に沿う方向で分割されるとともに前記冷却流体通路で相互に連通可能な複数の分割冷却ジャケットから成ることを第２の特徴とする。 Further, in the present invention, in addition to the configuration of the first feature, the block-side cooling jacket is divided in a direction along the axis of the cylinder bore and from a plurality of divided cooling jackets that can communicate with each other in the cooling fluid passage. The second feature is that it is formed.
　本発明は、第１または第２の特徴の構成に加えて、前記冷却流体通路の一部を構成して前記シリンダボアの軸線と平行に延びる直線状通路部内に、当該直線状通路部の軸線方向に延びる前記制御弁が挿入されることを第３の特徴とする。 In the present invention, in addition to the configuration of the first or second feature, in the linear passage portion which constitutes a part of the cooling fluid passage and extends parallel to the axis of the cylinder bore, the axial direction of the linear passage portion. The third feature is that the control valve extending to is inserted.
　本発明は、第１～第３の特徴の構成のいずれかに加えて、前記制御弁が、棒状である制御弁主部に切欠きが設けられて成ることを第４の特徴とする。 The fourth feature of the present invention is that, in addition to any of the configurations of the first to third features, the control valve is provided with a notch in the rod-shaped control valve main portion.
　本発明は、第２～第４の特徴の構成のいずれかに加えて、前記制御弁に、当該制御弁を前記直線状通路部の軸線方向に移動させ得るアクチュエータが連結されることを第５の特徴とする。 In the fifth aspect of the present invention, in addition to any of the configurations of the second to fourth features, the control valve is connected to an actuator capable of moving the control valve in the axial direction of the linear passage portion. It is a feature of.
　さらに本発明は、第２または第３の特徴の構成に加えて、前記制御弁に、当該制御弁を前記直線状通路部内で軸線まわりに回動させ得るアクチュエータが連結されることを第６の特徴とする。 Further, in the sixth aspect of the present invention, in addition to the configuration of the second or third feature, the control valve is connected to an actuator capable of rotating the control valve around the axis in the linear passage portion. It is a feature.
　本発明の第１の特徴によれば、ヘッド側冷却ジャケットからの冷却流体をブロック側冷却ジャケット側に導く冷却流体通路に、ブロック側冷却ジャケットでの冷却流体の流通を制御する制御弁が設けられるので、内燃機関の始動状態を含む運転状態に応じてブロック側冷却ジャケットでの冷却流体の流通を制御することが可能であり、シリンダブロックの温度を運転状態に応じて適切に制御して潤滑効率の向上を図ることができる。 According to the first feature of the present invention, a control valve for controlling the flow of the cooling fluid in the block side cooling jacket is provided in the cooling fluid passage that guides the cooling fluid from the head side cooling jacket to the block side cooling jacket side. Therefore, it is possible to control the flow of the cooling fluid in the block-side cooling jacket according to the operating state including the starting state of the internal combustion engine, and the temperature of the cylinder block is appropriately controlled according to the operating state to achieve lubrication efficiency. Can be improved.
　また本発明の第２の特徴によれば、ブロック側冷却ジャケットが、シリンダボアの軸線に沿う方向で分割されるとともに相互に連通可能な複数の分割冷却ジャケットから成るので、シリンダボアの軸線に沿う複数の部位での温度を運転状態に応じて変化させることができる。 Further, according to the second feature of the present invention, since the block-side cooling jacket is composed of a plurality of divided cooling jackets that are divided in the direction along the axis of the cylinder bore and can communicate with each other, a plurality of cooling jackets along the axis of the cylinder bore are formed. The temperature at the site can be changed according to the operating condition.
　本発明の第３の特徴によれば、シリンダボアの軸線と平行に配置されて冷却流体通路の一部を構成する直線状通路部に、その通路部の軸線方向に延びる制御弁が挿入されるので、制御弁の配置が簡便となる。 According to the third feature of the present invention, the control valve extending in the axial direction of the passage portion is inserted into the linear passage portion which is arranged parallel to the axis of the cylinder bore and forms a part of the cooling fluid passage. , The arrangement of the control valve becomes simple.
　本発明の第４の特徴によれば、棒状である制御弁主部に切欠きが設けられるようにして制御弁を構成することで、制御弁の構造を簡略化することができる。 According to the fourth feature of the present invention, the structure of the control valve can be simplified by configuring the control valve so that the rod-shaped control valve main portion is provided with a notch.
　本発明の第５の特徴によれば、アクチュエータで直線状通路部の軸線方向に制御弁を移動させるようにして、簡潔な構造で冷却流体の制御を行なうことができる。 According to the fifth feature of the present invention, the cooling fluid can be controlled with a simple structure by moving the control valve in the axial direction of the linear passage portion by the actuator.
　さらに本発明の第６の特徴によれば、アクチュエータによって直線状通路部内で制御弁を回転させるようにして、簡潔な構造で冷却流体の制御を行なうことができる。 Further, according to the sixth feature of the present invention, the cooling fluid can be controlled with a simple structure by rotating the control valve in the linear passage portion by the actuator.
図１は第１の実施の形態の内燃機関の要部縦断面図である。（第１の実施の形態）FIG. 1 is a vertical sectional view of a main part of the internal combustion engine according to the first embodiment. (First Embodiment) 図２は機関本体の冷却システムの構成を示す図である。（第１の実施の形態）FIG. 2 is a diagram showing a configuration of a cooling system of the engine body. (First Embodiment) 図３は内燃機関の始動時における図１のａ－ａ線断面図である。（第１の実施の形態）FIG. 3 is a cross-sectional view taken along the line aa of FIG. 1 when the internal combustion engine is started. (First Embodiment) 図４は内燃機関の始動時における図１のｂ－ｂ線断面図である。（第１の実施の形態）FIG. 4 is a sectional view taken along line bb of FIG. 1 when the internal combustion engine is started. (First Embodiment) 図５は内燃機関の始動状時での制御弁の作動状態をブロック側冷却ジャケットおよび冷却流体通路を透過させて示す図である。（第１の実施の形態）FIG. 5 is a diagram showing the operating state of the control valve at the start state of the internal combustion engine through the block side cooling jacket and the cooling fluid passage. (First Embodiment) 図６は内燃機関の始動時での図１のａ－ａ線、ｂ－ｂ線およびｃ－ｃ線に沿う簡略化した断面を（ａ），（ｂ），（ｃ）で示す図である。（第１の実施の形態）FIG. 6 is a diagram showing simplified cross sections along lines aa, bb, and cc of FIG. 1 at the time of starting the internal combustion engine with (a), (b), and (c). .. (First Embodiment) 図７は内燃機関の中負荷運転時での図１のａ－ａ線、ｂ－ｂ線およびｃ－ｃ線に沿う簡略化した断面を（ａ），（ｂ），（ｃ）で示す図である。（第１の実施の形態）FIG. 7 is a diagram showing simplified cross sections along lines aa, bb, and cc of FIG. 1 during medium load operation of an internal combustion engine, as shown by (a), (b), and (c). Is. (First Embodiment) 図８は内燃機関の高負荷運転時での図１のａ－ａ線、ｂ－ｂ線およびｃ－ｃ線に沿う簡略化した断面を（ａ），（ｂ），（ｃ）で示す図である。（第１の実施の形態）FIG. 8 is a diagram showing simplified cross sections along lines aa, bb, and cc of FIG. 1 during high-load operation of an internal combustion engine, as shown by (a), (b), and (c). Is. (First Embodiment) 図９は第２の実施の形態の内燃機関の要部縦断面図である。（第２の実施の形態）FIG. 9 is a vertical cross-sectional view of a main part of the internal combustion engine of the second embodiment. (Second Embodiment) 図１０は内燃機関の始動状時での制御弁の作動状態をブロック側冷却ジャケットおよび冷却流体通路を透過させて示す図である。（第２の実施の形態）FIG. 10 is a diagram showing the operating state of the control valve at the start state of the internal combustion engine through the block side cooling jacket and the cooling fluid passage. (Second Embodiment) 図１１は制御弁を図１０とは反対側から見た斜視図である。（第２の実施の形態）FIG. 11 is a perspective view of the control valve as viewed from the side opposite to that of FIG. (Second Embodiment) 図１２は内燃機関の始動時での図９のａ－ａ線およびｂ－ｂ線に沿う簡略化した断面を（ａ），（ｂ）で示す図である。（第２の実施の形態）FIG. 12 is a diagram showing simplified cross sections taken along the lines aa and bb of FIG. 9 when the internal combustion engine is started, as shown in (a) and (b). (Second Embodiment) 図１３は内燃機関の高負荷運転時での図９のａ－ａ線およびｂ－ｂ線に沿う簡略化した断面を（ａ），（ｂ）で示す図である。（第２の実施の形態）FIG. 13 is a diagram showing simplified cross sections taken along the lines aa and bb of FIG. 9 during high-load operation of the internal combustion engine in FIGS. 9A and 13B. (Second Embodiment)
１２Ａ，１２Ｂ・・・シリンダブロック
１３・・・シリンダヘッド
１５・・・ピストン
１６・・・シリンダボア
１７・・・燃焼室
３５，４９・・・ブロック側冷却ジャケット
３５ａ，３５ｂ，３５ｃ，４９ａ，４９ｂ・・・分割冷却ジャケット
３６・・・ヘッド側冷却ジャケット
３８，５０・・・冷却流体通路
３８ａ，５０ａ・・・直線状通路部
３９，５１・・・制御弁
３９ａ・・・制御弁主部
４１，４２，４３・・・切欠き
４４，５８・・・アクチュエータ
Ｃ・・・シリンダボアの軸線 12A, 12B ... Cylinder block 13 ... Cylinder head 15 ... Piston 16 ... Cylinder bore 17 ... Combustion chamber 35, 49 ... Block side cooling jackets 35a, 35b, 35c, 49a, 49b ...・ ・ Split cooling jacket 36 ・ ・ ・ Head side cooling jacket 38, 50 ・ ・ ・ Cooling fluid passage 38a, 50a ・ ・ ・ Linear passage part 39, 51 ・ ・ ・ Control valve 39a ・ ・ ・ Control valve main part 41, 42, 43 ... Notch 44, 58 ... Actuator C ... Cylinder bore axis
　本発明の実施の形態について添付図面に基づいて説明する。 An embodiment of the present invention will be described with reference to the accompanying drawings.
第１の実施の形態First Embodiment
　先ず図１～図８を参照しながら第１の実施の形態を説明すると、図１において、内燃機関ＥＡは、たとえば自動二輪車に搭載されるものであり、その機関本体１１Ａは、図示しないクランクケースと、自動二輪車への搭載状態で前上がりに傾斜して前記クランクケースに結合されるシリンダブロック１２と、そのシリンダブロック１２に結合されるシリンダヘッド１３と、当該シリンダヘッド１３に結合されるヘッドカバー１４とを有して単気筒に構成される。 First, the first embodiment will be described with reference to FIGS. 1 to 8. In FIG. 1, the internal combustion engine EA is mounted on, for example, a motorcycle, and the engine body 11A is a crankcase (not shown). A cylinder block 12 that is tilted forward and coupled to the crankcase while mounted on a motorcycle, a cylinder head 13 that is coupled to the cylinder block 12, and a head cover 14 that is coupled to the cylinder head 13. It has and is configured as a single cylinder.
　前記シリンダブロック１２は、自動二輪車への搭載状態で前上がりに傾斜した軸線Ｃを有するとともにピストン１５を摺動自在に嵌合させるシリンダボア１６を有しており、前記ピストン１５の頂部を臨ませる燃焼室１７が前記シリンダブロック１２および前記シリンダヘッド１３間に形成される。前記シリンダヘッド１３の後部側壁１３ａには、前記燃焼室１７に通じ得る吸気ポート１８が設けられ、この吸気ポート１８にはインシュレータ２０を介してスロットルボディ２１が接続され、このスロットルボディ２１には燃料噴射弁２２が付設される。また前記シリンダヘッド１３の前部側壁１３ｂには、前記燃焼室１７に通じ得る排気ポート１９が設けられる。 The cylinder block 12 has an axis C that is inclined forward when mounted on a motorcycle, and also has a cylinder bore 16 that slidably fits the piston 15. Combustion that faces the top of the piston 15. A chamber 17 is formed between the cylinder block 12 and the cylinder head 13. An intake port 18 that can communicate with the combustion chamber 17 is provided on the rear side wall 13a of the cylinder head 13, a throttle body 21 is connected to the intake port 18 via an insulator 20, and fuel is supplied to the throttle body 21. An injection valve 22 is attached. Further, the front side wall 13b of the cylinder head 13 is provided with an exhaust port 19 that can communicate with the combustion chamber 17.
　また前記シリンダヘッド１３には、前記吸気ポート１８から前記燃焼室１７への吸気量を制御する吸気弁２４と、前記燃焼室１７から前記排気ポート１９への排気量を制御する排気弁２５とが、それぞれ閉弁側にばね付勢されつつ開閉作動可能に配設される。 Further, the cylinder head 13 includes an intake valve 24 that controls the intake amount from the intake port 18 to the combustion chamber 17, and an exhaust valve 25 that controls the exhaust amount from the combustion chamber 17 to the exhaust port 19. , Each is arranged so that it can be opened and closed while being spring-forced on the valve closing side.
　前記吸気弁２４は、前記シリンダヘッド１３および前記ヘッドカバー１４間に配置される吸気側動弁装置２６で開閉駆動されるものであり、この吸気側動弁装置２６は、前記吸気弁２４の弁軸部２４ａに当接して前記シリンダヘッド１３に摺動可能に嵌合される吸気弁側キャップ２７と、前記シリンダヘッド１３に回転作動可能に支持される吸気側カムシャフト２８とを備え、前記吸気側カムシャフト２８には、前記吸気弁側キャップ２７に摺接する吸気側カム２９が設けられる。 The intake valve 24 is opened and closed by an intake side valve device 26 arranged between the cylinder head 13 and the head cover 14, and the intake side valve device 26 is a valve shaft of the intake valve 24. An intake valve side cap 27 that comes into contact with the portion 24a and is slidably fitted to the cylinder head 13 and an intake side camshaft 28 that is rotatably supported by the cylinder head 13 are provided. The camshaft 28 is provided with an intake side cam 29 that is in sliding contact with the intake valve side cap 27.
　また前記排気弁２５は、前記シリンダヘッド１３および前記ヘッドカバー１４間に配置される排気側動弁装置３０で開閉駆動されるものであり、この排気側動弁装置３０は、前記排気弁２５の弁軸部２５ａに当接して前記シリンダヘッド１３に摺動可能に嵌合される排気弁側キャップ３１と、前記シリンダヘッド１３に回転作動可能に支持される排気側カムシャフト３２とを備え、この排気側カムシャフト３２には、前記排気弁側キャップ３１に摺接する排気側カム３３が設けられる。 Further, the exhaust valve 25 is opened and closed by an exhaust side valve device 30 arranged between the cylinder head 13 and the head cover 14, and the exhaust side valve device 30 is a valve of the exhaust valve 25. An exhaust valve side cap 31 that comes into contact with the shaft portion 25a and is slidably fitted to the cylinder head 13 and an exhaust side camshaft 32 that is rotatably supported by the cylinder head 13 are provided. The side camshaft 32 is provided with an exhaust side cam 33 that is in sliding contact with the exhaust valve side cap 31.
　図２を併せて参照して、前記機関本体１１Ａは、冷却流体たとえば水やガスの流通によって当該機関本体１１Ａを冷却するための冷却ジャケット３４を有しており、この冷却ジャケット３４は、前記シリンダボア１６の周囲に配置されるようにして前記シリンダブロック１２に設けられるブロック側冷却ジャケット３５と、前記燃焼室１７の周囲に配置されるようにして前記シリンダヘッド１３に設けられるヘッド側冷却ジャケット３６とを備える。 With reference to FIG. 2, the engine body 11A has a cooling jacket 34 for cooling the engine body 11A by the flow of a cooling fluid such as water or gas, and the cooling jacket 34 has the cylinder bore. A block-side cooling jacket 35 provided on the cylinder block 12 so as to be arranged around the 16 and a head-side cooling jacket 36 provided on the cylinder head 13 so as to be arranged around the combustion chamber 17. To be equipped.
　冷却流体を循環する冷却流体循環ポンプ３７から吐出される冷却流体は、前記ヘッド側冷却ジャケット３６に供給され、このヘッド側冷却ジャケット３６から冷却流体通路３８を経て前記ブロック側冷却ジャケット３５側に冷却流体が導かれるのであるが、前記ブロック側冷却ジャケット３５への冷却流体の流通は前記冷却流体通路３８に設けられる制御弁３９で制御され、前記制御弁３９で制御された後の冷却流体はラジエータ４０を経て前記冷却流体循環ポンプ３７に戻される。 The cooling fluid discharged from the cooling fluid circulation pump 37 that circulates the cooling fluid is supplied to the head-side cooling jacket 36, and is cooled from the head-side cooling jacket 36 to the block-side cooling jacket 35 via the cooling fluid passage 38. Although the fluid is guided, the flow of the cooling fluid to the block-side cooling jacket 35 is controlled by the control valve 39 provided in the cooling fluid passage 38, and the cooling fluid after being controlled by the control valve 39 is a radiator. It is returned to the cooling fluid circulation pump 37 via 40.
　図３～図５を併せて参照して、前記冷却流体通路３８は、前記ヘッド側冷却ジャケット３６からの冷却流体を前記ブロック側冷却ジャケット３５側に導くものであり、この冷却流体通路３８の少なくとも一部は、前記シリンダブロック１２および前記シリンダヘッド１３に設けられる。 With reference to FIGS. 3 to 5, the cooling fluid passage 38 guides the cooling fluid from the head-side cooling jacket 36 to the block-side cooling jacket 35 side, and at least the cooling fluid passage 38. A part is provided on the cylinder block 12 and the cylinder head 13.
　前記ブロック側冷却ジャケット３５は、前記シリンダボア１６の軸線Ｃに沿う方向で分割されるとともに前記冷却流体通路３８で相互に連通可能な複数の分割冷却ジャケットから成るものであり、この実施の形態では、前記シリンダボア１６の軸線Ｃに沿う方向で前記シリンダヘッド１３側から順に並ぶ第１分割冷却ジャケット３５ａ、第２分割冷却ジャケット３５ｂおよび第３分割冷却ジャケット３５ｃが、前記シリンダボア１６を囲むリング状に形成されつつ、相互間に等間隔があくようにして前記シリンダブロック１２に設けられる。 The block-side cooling jacket 35 is composed of a plurality of divided cooling jackets that are divided in the direction along the axis C of the cylinder bore 16 and that can communicate with each other in the cooling fluid passage 38. The first divided cooling jacket 35a, the second divided cooling jacket 35b, and the third divided cooling jacket 35c arranged in order from the cylinder head 13 side in the direction along the axis C of the cylinder bore 16 are formed in a ring shape surrounding the cylinder bore 16. At the same time, the cylinder block 12 is provided so as to be evenly spaced from each other.
　前記シリンダブロック１２は、上述の第１～第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃを有することで中空空間を有する構造となり、３Ｄプリンター等を用いて製造され、第１～第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃに対応した空間を構成する部材を鋳込むことで、第１～第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃを有するシリンダブロック１２を形成することができる。 The cylinder block 12 has a structure having a hollow space by having the above-mentioned first to third divided cooling jackets 35a, 35b, 35c, and is manufactured by using a 3D printer or the like, and the first to third divided cooling jackets 35a. By casting a member that constitutes a space corresponding to, 35b, 35c, the cylinder block 12 having the first to third divided cooling jackets 35a, 35b, 35c can be formed.
　図５に注目して、前記冷却流体通路３８は、前記第１分割冷却ジャケット３５ａ、第２分割冷却ジャケット３５ｂおよび第３分割冷却ジャケット３５ｃの周方向の一部を横断するようにしつつ前記シリンダボア１６の軸線Ｃと平行に延びて前記シリンダブロック１２および前記シリンダヘッド１３に設けられる直線状通路部３８ａと、前記ヘッド側冷却ジャケット３６からの冷却流体を導くようにしつつ前記第１分割冷却ジャケット３５ａに対応する位置で前記直線状通路部３８ａの内面に下流端部が開口する導入通路部３８ｂと、その導入通路部３８ｂの開口端に対向する位置で前記直線状通路部３８ａの内面に一端部を開口させるとともに前記直線状通路部３８ａの一部を迂回するように延びて前記第２分割冷却ジャケット３５ｂに対応する部分で前記直線状通路部３８ａの内面に他端部を開口させる第１迂回通路部３８ｃと、第１迂回通路部３８ｃの他端開口部に対向する位置で前記直線状通路部３８ａの内面に一端部を開口させるとともに前記直線状通路部３８ａの一部を迂回するように延びて前記第３分割冷却ジャケット３５ｃに対応する部分で前記直線状通路部３８ａの内面に他端部を開口させる第２迂回通路部３８ｄと、その第２迂回通路部３８ｄの他端開口部に対向する位置で前記直線状通路部３８ａの内面に一端部を開口させる排出通路部３８ｅとから成り、前記排出通路部３８ｅの他端部は前記ラジエータ４０に接続される。 Focusing on FIG. 5, the cooling fluid passage 38 traverses a part of the first split cooling jacket 35a, the second split cooling jacket 35b, and the third split cooling jacket 35c in the circumferential direction, and the cylinder bore 16 In the first split cooling jacket 35a while guiding the cooling fluid from the head side cooling jacket 36 and the linear passage portion 38a provided in the cylinder block 12 and the cylinder head 13 extending in parallel with the axis C of the above. An introduction passage 38b whose downstream end opens on the inner surface of the linear passage 38a at a corresponding position, and one end on the inner surface of the linear passage 38a at a position facing the opening end of the introduction passage 38b. A first detour passage that opens and extends so as to bypass a part of the linear passage portion 38a and opens the other end portion on the inner surface of the linear passage portion 38a at a portion corresponding to the second split cooling jacket 35b. One end is opened on the inner surface of the linear passage 38a at a position facing the other end opening of the first detour passage 38c and the portion 38c, and extends so as to bypass a part of the linear passage 38a. The second detour passage portion 38d that opens the other end portion on the inner surface of the linear passage portion 38a at the portion corresponding to the third division cooling jacket 35c and the other end opening portion of the second detour passage portion 38d are opposed to each other. It is composed of a discharge passage portion 38e that opens one end on the inner surface of the linear passage portion 38a at such a position, and the other end of the discharge passage portion 38e is connected to the radiator 40.
　前記導入通路部３８ｂ、前記第１迂回通路部３８ｃ、前記第２迂回通路部３８ｄおよび前記排出通路部３８ｅは、それら３８ｂ，３８ｃ，３８ｄ，３８ｅの少なくとも一部が、前記シリンダブロック１２および前記シリンダヘッド１３とは別体の導管で構成されていてもよい。 The introduction passage portion 38b, the first detour passage portion 38c, the second detour passage portion 38d, and the discharge passage portion 38e are such that at least a part of 38b, 38c, 38d, 38e is the cylinder block 12 and the cylinder. It may be composed of a conduit separate from the head 13.
　前記制御弁３９は、前記冷却流体通路３８の一部を構成して前記シリンダボア１６の軸線Ｃと平行に延びる前記直線状通路部３８ａの軸線方向に延びるものであり、前記直線状通路部３８ａ内に挿入される。 The control valve 39 constitutes a part of the cooling fluid passage 38 and extends in the axial direction of the linear passage portion 38a extending in parallel with the axis C of the cylinder bore 16, and is inside the linear passage portion 38a. Will be inserted into.
　前記制御弁３９は、棒状である制御弁主部３９ａに、第１、第２および第３の切欠き４１，４２，４３が設けられて成るものであり、第１および第２の切欠き４１，４２は、前記制御弁主部３９ａの一部を円弧状に切欠くようにして前記制御弁主部３９ａの一直径線ＤＬ１の両側に配置される。また第３の切欠き４３は、前記一直径線ＤＬ１に沿う方向で前記制御弁主部３９ａの半部を切欠くように形成される。このような形状の前記制御弁３９が３Ｄプリンター等を用いて製作されるようにしてもよい。 The control valve 39 is formed by providing first, second and third notches 41, 42 and 43 in a rod-shaped control valve main portion 39a, and the first and second notches 41 are provided. , 42 are arranged on both sides of the one-diameter line DL1 of the control valve main portion 39a so as to cut out a part of the control valve main portion 39a in an arc shape. Further, the third notch 43 is formed so as to cut out a half portion of the control valve main portion 39a in the direction along the one-diameter line DL1. The control valve 39 having such a shape may be manufactured by using a 3D printer or the like.
　前記第１および第２の切欠き４１，４２は、前記制御弁主部３９ａの前記シリンダヘッド１３側の端部から当該制御弁主部３９ａの軸線に沿う方向で第１の所定長さＬ１を有するように形成されており、前記第１の所定長さＬ１は、前記第１分割冷却ジャケット３５ａの前記シリンダヘッド１３側の端部から前記第３分割冷却ジャケット３５ｃの前記シリンダヘッド１３とは反対側の端部までの長さに設定される。 The first and second notches 41 and 42 have a first predetermined length L1 in a direction along the axis of the control valve main portion 39a from the end portion of the control valve main portion 39a on the cylinder head 13 side. The first predetermined length L1 is formed so as to have, and the first predetermined length L1 is opposite to the cylinder head 13 of the third divided cooling jacket 35c from the end portion of the first divided cooling jacket 35a on the cylinder head 13 side. It is set to the length to the end of the side.
　また前記第３の切欠き４３は、前記制御弁主部３９ａの軸線に沿う方向で前記第１の切欠き４１および前記第２の切欠き４２とは第２の所定長さＬ２の間隔をあけた位置で前記第１および第２の切欠き４１，４２よりも前記シリンダヘッド１３から遠ざかる位置に配置され、前記制御弁主部３９ａの軸線に沿う方向で第３の所定長さＬ３を有するようにして前記制御弁主部３９ａに形成される。 Further, the third notch 43 is spaced from the first notch 41 and the second notch 42 by a second predetermined length L2 in a direction along the axis of the control valve main portion 39a. It is arranged at a position farther from the cylinder head 13 than the first and second notches 41 and 42 at the above position, and has a third predetermined length L3 in the direction along the axis of the control valve main portion 39a. It is formed on the control valve main portion 39a.
　前記第２の所定長さＬ２は、前記第１分割冷却ジャケット３５ａおよび前記第２分割冷却ジャケット３５ｂ相互間の間隔、ならびに前記第２分割冷却ジャケット３５ｂおよび前記第３分割冷却ジャケット３５ｃ相互間の間隔に対応して設定される。また前記第３の所定長さＬ３は、前記第２分割冷却ジャケット３５ｂの前記シリンダヘッド１３側端部から前記第３分割冷却ジャケット３５ｃの前記シリンダヘッド１３とは反対側の端部までの長さに設定される。 The second predetermined length L2 is the spacing between the first split cooling jacket 35a and the second split cooling jacket 35b, and the spacing between the second split cooling jacket 35b and the third split cooling jacket 35c. It is set corresponding to. Further, the third predetermined length L3 is a length from the end of the second divided cooling jacket 35b on the side opposite to the cylinder head 13 to the end of the third divided cooling jacket 35c on the opposite side of the cylinder head 13. Is set to.
　前記制御弁３９は、その制御弁主部３９ａの前記一直径線ＤＬ１がリング状である前記第１～第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃの半径方向に沿う位置となるようにして、前記直線状通路部３８ａに挿入される。 The control valve 39 is arranged so that the one-diameter line DL1 of the control valve main portion 39a is located along the radial direction of the first to third divided cooling jackets 35a, 35b, 35c having a ring shape. It is inserted into the linear passage portion 38a.
　前記直線状通路部３８ａ内で前記第１分割冷却ジャケット３５ａに対応する位置だけに前記第１の切欠き４１および前記第２の切欠き４２が在り、第３の切欠き４３が、前記第２分割冷却ジャケット３５ｂおよび前記第３分割冷却ジャケット３５ｃに対応する位置に在るときには、図３および図６（ａ）で明示するように、前記第１分割冷却ジャケット３５ａの周方向一箇所が前記制御弁主部３９ａで遮断され、遮断された状態の前記第１分割冷却ジャケット３５ａの周方向一端部に前記冷却流体通路３８の前記導入通路部３８ｂが前記第１の切欠き４１を介して連通され、前記第１分割冷却ジャケット３５ａの周方向他端部は、前記第２の切欠き４２を介して前記冷却流体通路３８における前記第１迂回通路部３８ｃの一端部に連通される。また第２分割冷却ジャケット３５ｂは図４および図６（ｂ）で示すように、前記冷却流体通路３８とは制御弁主部３９ａで遮断され、前記第１迂回通路部３８ｃおよび前記第２迂回通路部３８ｄは前記第３の切欠き４３を介して連通される。さらに前記第３分割冷却ジャケット３５ｃは、図６（ｃ）で示すように、前記冷却流体通路３８とは制御弁主部３９ａで遮断され、前記第２迂回通路部３８ｄおよび前記排出通路部３８ｅは前記第３の切欠き４３を介して連通される。 The first notch 41 and the second notch 42 are present only at positions corresponding to the first divided cooling jacket 35a in the linear passage portion 38a, and the third notch 43 is the second. When the split cooling jacket 35b and the third split cooling jacket 35c are located at positions corresponding to the split cooling jacket 35c, one location in the circumferential direction of the first split cooling jacket 35a is the control, as clearly shown in FIGS. 3 and 6A. The introduction passage portion 38b of the cooling fluid passage 38 is communicated with the peripheral end portion of the first divided cooling jacket 35a in a blocked state by the valve main portion 39a via the first notch 41. The other end in the circumferential direction of the first divided cooling jacket 35a is communicated with one end of the first detour passage 38c in the cooling fluid passage 38 via the second notch 42. Further, as shown in FIGS. 4 and 6 (b), the second divided cooling jacket 35b is blocked from the cooling fluid passage 38 by the control valve main portion 39a, and the first detour passage portion 38c and the second detour passage 38c. The portion 38d is communicated through the third notch 43. Further, as shown in FIG. 6C, the third divided cooling jacket 35c is blocked from the cooling fluid passage 38 by the control valve main portion 39a, and the second detour passage portion 38d and the discharge passage portion 38e are separated from each other. It is communicated through the third notch 43.
　前記直線状通路部３８ａ内で前記第１分割冷却ジャケット３５ａおよび第２分割冷却ジャケット３５ｂに対応する位置に前記第１の切欠き４１および前記第２の切欠き４２が在り、前記第３分割冷却ジャケット３５ｃに対応する位置に前記第３の切欠き４３が在るときには、図７（ａ）で示すように、前記第１分割冷却ジャケット３５ａの周方向一箇所が前記制御弁主部３９ａで遮断され、遮断された状態の前記第１分割冷却ジャケット３５ａの周方向一端部が第１の切欠き４１を介して前記導入通路部３８ｂに連通されるとともに前記第１分割冷却ジャケット３５ａの周方向他端部が前記第２の切欠き４２に連通される。また図７（ｂ）で示すように、前記第２分割冷却ジャケット３５ｂの周方向一箇所が前記制御弁主部３９ａで遮断され、遮断された状態の第２分割冷却ジャケット３５ｂの周方向一端に第２の切欠き４２を介して第１分割冷却ジャケット３５ａが連通され、第２分割冷却ジャケット３５ｂの周方向他端が第１の切欠き４１を介して前記第２迂回通路部３８ｄの一端部に連通される。さらに図７（ｃ）で示すように、第３分割冷却ジャケット３５ｃは制御弁主部３９ａで前記直線状通路部３８ａとは遮断されており、前記第２迂回通路部３８ｄは前記第３の切欠き４３を介して前記排出通路部３８ｅに連通される。 The first notch 41 and the second notch 42 are located in the linear passage portion 38a at positions corresponding to the first divided cooling jacket 35a and the second divided cooling jacket 35b, and the third divided cooling is performed. When the third notch 43 is present at a position corresponding to the jacket 35c, as shown in FIG. 7A, one location in the circumferential direction of the first divided cooling jacket 35a is blocked by the control valve main portion 39a. One end in the circumferential direction of the first divided cooling jacket 35a in a blocked state is communicated with the introduction passage portion 38b via the first notch 41, and the circumferential direction of the first divided cooling jacket 35a and the like. The end is communicated with the second notch 42. Further, as shown in FIG. 7 (b), one location in the circumferential direction of the second split cooling jacket 35b is blocked by the control valve main portion 39a, and one end in the circumferential direction of the second split cooling jacket 35b in the blocked state. The first split cooling jacket 35a is communicated through the second notch 42, and the other end in the circumferential direction of the second split cooling jacket 35b is one end of the second detour passage portion 38d via the first notch 41. Is communicated with. Further, as shown in FIG. 7C, the third split cooling jacket 35c is blocked from the linear passage portion 38a by the control valve main portion 39a, and the second detour passage portion 38d is cut off from the third cut. It is communicated with the discharge passage portion 38e via the notch 43.
　前記第１分割冷却ジャケット３５ａ、第２分割冷却ジャケット３５ｂおよび第３分割冷却ジャケット３５ｃに対応する位置に前記第１の切欠き４１および前記第２の切欠き４２が在るときには、図８（ａ）で示すように、前記第１分割冷却ジャケット３５ａの周方向一箇所が前記制御弁主部３９ａで遮断され、遮断された状態の前記第１分割冷却ジャケット３５ａの周方向一端部が第１の切欠き４１を介して前記導入通路部３８ｂに連通されるとともに前記第１分割冷却ジャケット３５ａの周方向他端部が前記第２の切欠き４２に連通する。また図８（ｂ）で示すように、前記第２分割冷却ジャケット３５ｂの周方向一箇所が前記制御弁主部３９ａで遮断され、遮断された状態の第２分割冷却ジャケット３５ｂの周方向一端に第２の切欠き４２を介して第１分割冷却ジャケット３５ａが連通され、第２分割冷却ジャケット３５ｂの周方向他端が第１の切欠き４１を介して前記第２迂回通路部３８ｄの一端部に連通される。さらに図８（ｃ）で示すように、前記第３分割冷却ジャケット３５ｃの周方向一箇所が前記制御弁主部３９ａで遮断され、遮断された状態の第３分割冷却ジャケット３５ｃの周方向一端に、前記第１分割冷却ジャケット３５ａおよび前記第２分割冷却ジャケット３５ｂが第１の切欠き４１を介して連通され、第３分割冷却ジャケット３５ｃの周方向他端は前記排出通路部３８ｅの一端部に連通される。 When the first notch 41 and the second notch 42 are present at positions corresponding to the first divided cooling jacket 35a, the second divided cooling jacket 35b, and the third divided cooling jacket 35c, FIG. 8A ) Is blocked by the control valve main portion 39a at one location in the circumferential direction of the first split cooling jacket 35a, and one end portion in the circumferential direction of the first split cooling jacket 35a in the blocked state is the first. It communicates with the introduction passage portion 38b via the notch 41, and the other end in the circumferential direction of the first divided cooling jacket 35a communicates with the second notch 42. Further, as shown in FIG. 8B, one location in the circumferential direction of the second split cooling jacket 35b is cut off by the control valve main portion 39a, and one end in the circumferential direction of the second split cooling jacket 35b in the cut state. The first split cooling jacket 35a is communicated through the second notch 42, and the other end in the circumferential direction of the second split cooling jacket 35b is one end of the second detour passage portion 38d via the first notch 41. Is communicated with. Further, as shown in FIG. 8C, one location in the circumferential direction of the third divided cooling jacket 35c is cut off by the control valve main portion 39a, and one end in the circumferential direction of the third divided cooling jacket 35c in the blocked state. The first divided cooling jacket 35a and the second divided cooling jacket 35b are communicated with each other through the first notch 41, and the other end of the third divided cooling jacket 35c in the circumferential direction is connected to one end of the discharge passage portion 38e. Be communicated.
　ところで前記制御弁３９には、当該制御弁３９を前記直線状通路部３８ａ内で軸線方向に移動させ得るアクチュエータ４４が連結されており、このアクチュエータ４４は、たとえば温度に応じて容積を変化させるワックス等の熱軟性材料を含むもので構成されていてもよく、また電動モータを有するものであってもよい。 By the way, an actuator 44 capable of moving the control valve 39 in the linear passage portion 38a in the axial direction is connected to the control valve 39, and the actuator 44 is, for example, a wax whose volume is changed according to temperature. It may be made of a material containing a thermosoft material such as, or may have an electric motor.
　前記制御弁３９は、前記アクチュエータ４４で駆動されることにより、内燃機関ＥＡの始動時には、図６（ａ），（ｂ），（ｃ）で示すように、第１および第２の切欠き４１，４２を第１分割冷却ジャケット３５ａに対応させるとともに第３の切欠き４３を第２および第３分割冷却ジャケット３５ｂ，３５ｃに対応させた位置となり、内燃機関ＥＡの中負荷運転時には、図７（ａ），（ｂ），（ｃ）で示すように、第１および第２の切欠き４１，４２を第１および第２分割冷却ジャケット３５ａ，３５ｂに対応させるとともに第３の切欠き４３を第３分割冷却ジャケット３５ｃに対応させた位置となり、内燃機関ＥＡの高負荷運転時には、図８（ａ），（ｂ），（ｃ）で示すように、第１および第２の切欠き４１，４２を第１、第２および第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃに対応させた位置となる。 The control valve 39 is driven by the actuator 44, so that when the internal combustion engine EA is started, the first and second notches 41 are shown in FIGS. 6A, 6B, and 6C. , 42 correspond to the first split cooling jacket 35a and the third notch 43 corresponds to the second and third split cooling jackets 35b, 35c. During medium load operation of the internal combustion engine EA, FIG. 7 ( As shown by a), (b), and (c), the first and second notches 41 and 42 correspond to the first and second divided cooling jackets 35a and 35b, and the third notch 43 is the third. The position corresponds to the 3-split cooling jacket 35c, and during high-load operation of the internal combustion engine EA, the first and second notches 41 and 42 are shown in FIGS. 8 (a), 8 (b) and 8 (c). Is the position corresponding to the first, second and third divided cooling jackets 35a, 35b and 35c.
　そして前記内燃機関ＥＡの始動時には、前記ヘッド側ジャケット３６から導出された冷却流体は前記ブロック側ジャケット３５のうち第１分割冷却ジャケット３５ａだけを流通し、第２および第３分割冷却ジャケット３５ｂ，３５ｃはバイパスすることになり、前記内燃機関ＥＡの中負荷運転時には、前記ヘッド側ジャケット３６から導出された冷却流体は前記ブロック側ジャケット３５のうち第１および第２分割冷却ジャケット３５ａ，３５ｂだけを流通し、第３分割冷却ジャケット３５ｃはバイパスすることになり、前記内燃機関ＥＡの高負荷運転時には、前記ヘッド側ジャケット３６から導出された冷却流体は前記ブロック側ジャケット３５の第１、第２および第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃを順番に流通することになる。 When the internal combustion engine EA is started, the cooling fluid derived from the head side jacket 36 circulates only in the first divided cooling jacket 35a of the block side jacket 35, and the second and third divided cooling jackets 35b and 35c. Will be bypassed, and during the medium load operation of the internal combustion engine EA, the cooling fluid derived from the head side jacket 36 flows only through the first and second split cooling jackets 35a and 35b of the block side jacket 35. Then, the third split cooling jacket 35c is bypassed, and during the high load operation of the internal combustion engine EA, the cooling fluid derived from the head side jacket 36 is the first, second and second of the block side jacket 35. The three- piece cooling jackets 35a, 35b, and 35c will be distributed in order.
　次にこの第１の実施の形態の作用について説明すると、シリンダヘッド１３に設けられたヘッド側冷却ジャケット３６からの冷却流体を、シリンダブロック１２に設けられたブロック側冷却ジャケット３５側に導く冷却流体通路３８に、前記ブロック側冷却ジャケット３５での冷却流体の流通を制御する制御弁３９が設けられるので、内燃機関ＥＡの始動状態を含む運転状態に応じてブロック側冷却ジャケット３５での冷却流体の流通を制御することが可能であり、シリンダブロック１２の温度を運転状態に応じて適切に制御して潤滑効率の向上を図ることができる。 Next, the operation of the first embodiment will be described. A cooling fluid that guides the cooling fluid from the head-side cooling jacket 36 provided on the cylinder head 13 to the block-side cooling jacket 35 side provided on the cylinder block 12. Since the control valve 39 for controlling the flow of the cooling fluid in the block-side cooling jacket 35 is provided in the passage 38, the cooling fluid in the block-side cooling jacket 35 is provided according to the operating state including the starting state of the internal combustion engine EA. It is possible to control the flow, and it is possible to appropriately control the temperature of the cylinder block 12 according to the operating state to improve the cooling efficiency.
　また前記ブロック側冷却ジャケット３５は、前記シリンダブロック１２が有するシリンダボア１６の軸線Ｃに沿う方向で分割されるとともに前記冷却流体通路３８で相互に連通可能な複数の分割冷却ジャケット、この実施の形態では第１、第２および第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃから成るので、シリンダボア１６の軸線Ｃに沿う複数の部位での温度を運転状態に応じて変化させることができる。 Further, the block-side cooling jacket 35 is divided in a direction along the axis C of the cylinder bore 16 included in the cylinder block 12, and a plurality of divided cooling jackets that can communicate with each other in the cooling fluid passage 38, in this embodiment. Since it is composed of the first, second and third divided cooling jackets 35a, 35b and 35c, the temperature at a plurality of portions along the axis C of the cylinder bore 16 can be changed according to the operating state.
　また前記冷却流体通路３８の一部を構成して前記シリンダボア１６の軸線Ｃと平行に延びる直線状通路部３８ａ内に、当該直線状通路部３８ａの軸線方向に延びる前記制御弁３９が挿入されるので、制御弁３９の配置が簡便となる。 Further, the control valve 39 extending in the axial direction of the linear passage 38a is inserted into the linear passage 38a which constitutes a part of the cooling fluid passage 38 and extends parallel to the axis C of the cylinder bore 16. Therefore, the arrangement of the control valve 39 becomes simple.
　また前記制御弁３９が、棒状である制御弁主部３９ａに第１、第２および第３の切欠き４１，４２，４３が設けられて成ることにより、制御弁３９の構造を簡略化することができる。 Further, the structure of the control valve 39 is simplified by providing the control valve main portion 39a, which has a rod shape, with first, second and third notches 41, 42 and 43. Can be done.
　さらに前記制御弁３９に、当該制御弁３９を前記直線状通路部３８ａの軸線方向に移動させ得るアクチュエータ４４が連結されるので、簡潔な構造で冷却流体の制御を行なうことができる。 Further, since the actuator 44 capable of moving the control valve 39 in the axial direction of the linear passage portion 38a is connected to the control valve 39, the cooling fluid can be controlled with a simple structure.
第２の実施の形態Second embodiment
　本発明の第２の実施の形態について図９～図１３を参照しながら説明するが、上記第１の実施の形態に対応する部分は同一の参照符号を付して図示するのみとし、詳細な説明は省略する。 A second embodiment of the present invention will be described with reference to FIGS. 9 to 13, but the parts corresponding to the first embodiment are only shown with the same reference numerals and are detailed. The description is omitted.
　先ず図９において、内燃機関ＥＢの機関本体１１Ｂは、冷却流体たとえば水やガスの流通によって当該機関本体１１Ｂを冷却するための冷却ジャケット４８を有しており、この冷却ジャケット４８は、シリンダボア１６の周囲に配置されるようにしてシリンダブロック１２Ｂに設けられるブロック側冷却ジャケット４９と、燃焼室１７の周囲に配置されるようにしてシリンダヘッド１３に設けられるヘッド側冷却ジャケット３６とを備える。 First, in FIG. 9, the engine body 11B of the internal combustion engine EB has a cooling jacket 48 for cooling the engine body 11B by the flow of a cooling fluid such as water or gas, and the cooling jacket 48 is the cylinder bore 16. A block-side cooling jacket 49 provided on the cylinder block 12B so as to be arranged around the combustion chamber 17 and a head-side cooling jacket 36 provided on the cylinder head 13 so as to be arranged around the combustion chamber 17 are provided.
　図１０を併せて参照して、冷却流体を循環する冷却流体循環ポンプ３７（第１の実施の形態参照）から吐出される冷却流体は、前記ヘッド側冷却ジャケット３６に供給され、このヘッド側冷却ジャケット３６から冷却流体通路５０を経て前記ブロック側冷却ジャケット４９側に冷却流体が導かれるのであるが、前記ブロック側冷却ジャケット４９への冷却流体の流通は前記冷却流体通路５０に設けられる制御弁５１で制御され、前記制御弁５１で制御された後の冷却流体はラジエータ４０（第１の実施の形態参照）を経て前記冷却流体循環ポンプ３７に戻される。 With reference to FIG. 10, the cooling fluid discharged from the cooling fluid circulation pump 37 (see the first embodiment) that circulates the cooling fluid is supplied to the head-side cooling jacket 36, and the head-side cooling is performed. The cooling fluid is guided from the jacket 36 to the block-side cooling jacket 49 side via the cooling fluid passage 50, and the flow of the cooling fluid to the block-side cooling jacket 49 is a control valve 51 provided in the cooling fluid passage 50. The cooling fluid, which is controlled by the control valve 51 and then controlled by the control valve 51, is returned to the cooling fluid circulation pump 37 via the radiator 40 (see the first embodiment).
　前記冷却流体通路５０は、前記ヘッド側冷却ジャケット３６からの冷却流体を前記ブロック側冷却ジャケット４９側に導くものであり、この冷却流体通路５０の少なくとも一部は、前記シリンダブロック１２Ｂおよび前記シリンダヘッド１３に設けられる。 The cooling fluid passage 50 guides the cooling fluid from the head-side cooling jacket 36 to the block-side cooling jacket 49 side, and at least a part of the cooling fluid passage 50 is the cylinder block 12B and the cylinder head. It is provided in 13.
　前記ブロック側冷却ジャケット４９は、前記シリンダボア１６の軸線Ｃに沿う方向で分割されるとともに前記冷却流体通路５０で相互に連通可能な複数の分割冷却ジャケットから成るものであり、この実施の形態では、前記シリンダボア１６の軸線Ｃに沿う方向で前記シリンダヘッド１３側から順に並ぶ第１分割冷却ジャケット４９ａおよび第２分割冷却ジャケット４９ｂが、前記シリンダボア１６を囲むリング状に形成されつつ、相互間に等間隔があくようにして前記シリンダブロック１２Ｂに設けられる。 The block-side cooling jacket 49 is composed of a plurality of divided cooling jackets that are divided along the axis C of the cylinder bore 16 and that can communicate with each other in the cooling fluid passage 50. In this embodiment, the block-side cooling jacket 49 is composed of a plurality of divided cooling jackets. The first split cooling jacket 49a and the second split cooling jacket 49b, which are arranged in order from the cylinder head 13 side in the direction along the axis C of the cylinder bore 16, are formed in a ring shape surrounding the cylinder bore 16 and are evenly spaced from each other. It is provided on the cylinder block 12B so as to be open.
　前記シリンダブロック１２Ｂは、上述の第１および第２分割冷却ジャケット４９ａ，４９ｂを有することで中空空間を有する構造となり、３Ｄプリンター等を用いて製造され、第１および第２分割冷却ジャケット４９ａ，４９ｂに対応した空間を構成する部材を鋳込むことで、第１および第２分割冷却ジャケット４９ａ，４９ｂを有するシリンダブロック１２Ｂを形成することができる。 The cylinder block 12B has a structure having a hollow space by having the above-mentioned first and second divided cooling jackets 49a and 49b, and is manufactured by using a 3D printer or the like, and the first and second divided cooling jackets 49a and 49b. By casting a member that constitutes a space corresponding to the above, the cylinder block 12B having the first and second divided cooling jackets 49a and 49b can be formed.
　前記冷却流体通路５０は、前記第１分割冷却ジャケット４９ａおよび第２分割冷却ジャケット４９ｂの周方向の一部を横断するようにしつつ前記シリンダボア１６の軸線Ｃと平行に延びて前記シリンダブロック１２Ｂおよび前記シリンダヘッド１３に設けられる直線状通路部５０ａと、前記ヘッド側冷却ジャケット３６からの冷却流体を導くようにしつつ前記第１分割冷却ジャケット４９ａに対応する位置で前記直線状通路部５０ａの内面に下流端部が開口する導入通路部５０ｂと、前記第２分割冷却ジャケット４９ｂに対応する部分で前記直線状通路部５０ａの内面に一端部を開口させる排出通路部５０ｃとから成り、前記排出通路部５０ｃの他端部は前記ラジエータ４０に接続される。 The cooling fluid passage 50 extends in parallel with the axis C of the cylinder bore 16 while traversing a part of the circumferential direction of the first divided cooling jacket 49a and the second divided cooling jacket 49b, and the cylinder block 12B and the said. Downstream to the inner surface of the linear passage portion 50a at a position corresponding to the first divided cooling jacket 49a while guiding the cooling fluid from the head side cooling jacket 36 and the linear passage portion 50a provided on the cylinder head 13. The discharge passage portion 50c is composed of an introduction passage portion 50b having an open end portion and a discharge passage portion 50c having one end opened on the inner surface of the linear passage portion 50a at a portion corresponding to the second divided cooling jacket 49b. The other end of the radiator 40 is connected to the radiator 40.
　前記導入通路部５０ｂおよび前記排出通路部５０ｃは、それら５０ｂ，５０ｃの少なくとも一部が、前記シリンダブロック１２Ｂおよび前記シリンダヘッド１３とは別体の導管で構成されていてもよい。 At least a part of the introduction passage portion 50b and the discharge passage portion 50c may be formed of a conduit separate from the cylinder block 12B and the cylinder head 13.
　前記制御弁５１は、前記冷却流体通路５０の一部を構成して前記シリンダボア１６の軸線Ｃと平行に延びる前記直線状通路部５０ａの軸線方向に延びるものであり、前記直線状通路部５０ａ内に挿入される。 The control valve 51 constitutes a part of the cooling fluid passage 50 and extends in the axial direction of the linear passage portion 50a extending in parallel with the axis C of the cylinder bore 16, and is inside the linear passage portion 50a. Will be inserted into.
　図１１を併せて参照して、前記制御弁５１は、棒状である制御弁主部５１ａに、第４～第８の切欠き５２，５３，５４，５５，５６と、通路孔５７とが設けられて成るものであり、たとえば３Ｄプリンター等を用いて製作されるようにしてもよい。 With reference to FIG. 11, the control valve 51 is provided with fourth to eighth notches 52, 53, 54, 55, 56 and a passage hole 57 in a rod-shaped control valve main portion 51a. It may be manufactured by using, for example, a 3D printer or the like.
　第４および第５の切欠き５２，５３は、扇状の横断面形状を有しつつ前記制御弁主部５１ａの一直径線ＤＬ２の両側に配置される。また第６および第７の切欠き５４，５５は、第６の切欠き５４を前記第５の切欠き５３に隣接させるとともに第７の切欠き５５を前記第４の切欠き５２に隣接させるようにしつつ扇状の横断面形状を有して前記一直径線ＤＬ２の両側に配置される。また前記第８の切欠き５６は、前記第６の切欠き５４に対応した扇状の横断面形状を有しつつ前記第６の切欠き５４との間に軸方向に間隔をあけた位置で制御弁主部５１ａに設けられる。 The fourth and fifth notches 52 and 53 have a fan-shaped cross-sectional shape and are arranged on both sides of the one-diameter line DL2 of the control valve main portion 51a. Further, the sixth and seventh notches 54 and 55 are such that the sixth notch 54 is adjacent to the fifth notch 53 and the seventh notch 55 is adjacent to the fourth notch 52. It has a fan-shaped cross-sectional shape and is arranged on both sides of the one-diameter line DL2. Further, the eighth notch 56 is controlled at a position spaced axially from the sixth notch 54 while having a fan-shaped cross-sectional shape corresponding to the sixth notch 54. It is provided on the valve main portion 51a.
　前記第４の切欠き５２、前記第５の切欠き５３および前記第６の切欠き５４は、前記制御弁主部５１ａの軸方向で前記ブロック側冷却ジャケット４９の前記第１分割冷却ジャケットに４９ａに対応した位置に配置されるものであり、前記制御弁主部５１ａの軸線方向で前記第１分割冷却ジャケット４９ａに対応した長さを有するように形成される。また前記第７の切欠き５５は、前記制御弁主部５１ａの軸方向で前記第１分割冷却ジャケット４９ａの前記シリンダヘッド１３側端部から前記第２分割冷却ジャケットに４９ｂの前記シリンダヘッド１３とは反対側の端部までの長さを有するように形成され、前記第８の切欠き５６は、前記制御弁主部５１ａの軸方向で前記第２分割冷却ジャケットに４９ａに対応した位置に配置されるものであり、前記制御弁主部５１ａの軸線方向で前記第２分割冷却ジャケット４９ｂに対応した長さを有するように形成される。 The fourth notch 52, the fifth notch 53, and the sixth notch 54 are formed in the first divided cooling jacket of the block-side cooling jacket 49 in the axial direction of the control valve main portion 51a. It is arranged at a position corresponding to the above, and is formed so as to have a length corresponding to the first divided cooling jacket 49a in the axial direction of the control valve main portion 51a. Further, the seventh notch 55 is formed from the end of the first divided cooling jacket 49a on the side of the cylinder head 13 to the second divided cooling jacket with the cylinder head 13 of 49b in the axial direction of the control valve main portion 51a. Is formed so as to have a length to the opposite end, and the eighth notch 56 is arranged at a position corresponding to 49a in the second split cooling jacket in the axial direction of the control valve main portion 51a. It is formed so as to have a length corresponding to the second split cooling jacket 49b in the axial direction of the control valve main portion 51a.
　また前記通路孔５７の一端部５７ａは前記第５の切欠き５３に開口され、前記通路孔５７の他端部５７ｂは制御弁主部５１ａの外周に開口される。しかも前記通路孔５７の前記他端部５７ｂは、前記制御弁主部５１ａの周方向では前記第４の切欠き５２に対応する位置であって前記制御弁主部５１ａの軸方向では前記第２分割冷却ジャケット４９ｂに対応する位置に配置される。 Further, one end 57a of the passage hole 57 is opened in the fifth notch 53, and the other end 57b of the passage hole 57 is opened on the outer periphery of the control valve main portion 51a. Moreover, the other end 57b of the passage hole 57 is a position corresponding to the fourth notch 52 in the circumferential direction of the control valve main portion 51a, and the second end portion 57b in the axial direction of the control valve main portion 51a. It is arranged at a position corresponding to the split cooling jacket 49b.
　ところで前記制御弁５１には、当該制御弁５１を前記直線状通路部５０ａ内で軸線まわりに回動させ得るアクチュエータ５８が連結されており、このアクチュエータ５８は、たとえば温度に応じて容積を変化させるワックス等の熱軟性材料を含むもので構成されていてもよく、また電動モータを有するものであってもよい。 By the way, the control valve 51 is connected to an actuator 58 capable of rotating the control valve 51 around the axis in the linear passage portion 50a, and the actuator 58 changes the volume according to, for example, the temperature. It may be composed of a material containing a heat-soft material such as wax, or may have an electric motor.
　前記制御弁５１は、前記アクチュエータ５８で駆動されることにより、内燃機関ＥＢの始動時には、図１２（ａ），（ｂ）で示すように、第４および第５の切欠き５２，５３を第１分割冷却ジャケット４９ａに対応させるとともに第２分割冷却ジャケット４９ｂの周方向の一部を前記制御弁主部５１ａで遮断する位置となる。これによりヘッド側冷却ジャケット３６からの冷却流体が前記導入通路部５０ｂから第４の切欠き５２を経て第１分割冷却ジャケット４９ａ内を流通し、第５の切欠き５３から通路孔５７を経て前記排出通路部５０ｃ側に流れることになる。すなわち内燃機関ＥＢの始動時には、前記ヘッド側ジャケット３６から導出された冷却流体は前記ブロック側ジャケット４９のうち第１分割冷却ジャケット４９ａだけを流通し、第２分割冷却ジャケット４９ｂはバイパスすることになる。 The control valve 51 is driven by the actuator 58, and when the internal combustion engine EB is started, the fourth and fifth notches 52 and 53 are made into the fourth and fifth notches 52 and 53 as shown in FIGS. 12 (a) and 12 (b). It corresponds to the 1-split cooling jacket 49a and is a position where a part of the 2nd split cooling jacket 49b in the circumferential direction is blocked by the control valve main portion 51a. As a result, the cooling fluid from the head-side cooling jacket 36 flows from the introduction passage portion 50b through the fourth notch 52 in the first divided cooling jacket 49a, and from the fifth notch 53 through the passage hole 57. It will flow to the discharge passage portion 50c side. That is, when the internal combustion engine EB is started, the cooling fluid derived from the head side jacket 36 circulates only in the first division cooling jacket 49a of the block side jacket 49, and the second division cooling jacket 49b is bypassed. ..
　内燃機関Ｅの高負荷運転時には、前記制御弁５１は、前記アクチュエータ５８によって前記始動時の位置から１８０度回動され、図１３（ａ），（ｂ）で示すように、第６の切欠き５４を第１分割冷却ジャケット４９ａに対応させるとともに第７の切欠き５５を第１および第２分割冷却ジャケット４９ａ，４９ｂに対応させ、さらに第８の切欠き５６を第２分割冷却ジャケット４９ｂに対応させる位置となる。これによりヘッド側冷却ジャケット３６からの冷却流体は、前記導入通路部５０ｂから第４の切欠き５２、第１分割冷却ジャケット４９ａ、第７の切欠き５５、第２分割冷却ジャケット４９ｂおよび第８の切欠き５６を経て前記排出通路５０ｃに流れることになる。すなわち内燃機関ＥＢの高負荷運転時には、前記ヘッド側ジャケット３６から導出された冷却流体は前記ブロック側ジャケット４９の第１および第２分割冷却ジャケット４９ａ，４９ｂを順番に流通することになる。 During high-load operation of the internal combustion engine E, the control valve 51 is rotated 180 degrees from the starting position by the actuator 58, and as shown in FIGS. 13A and 13B, the sixth notch is formed. The 54 corresponds to the first divided cooling jacket 49a, the seventh notch 55 corresponds to the first and second divided cooling jackets 49a and 49b, and the eighth notch 56 corresponds to the second divided cooling jacket 49b. It will be the position to let. As a result, the cooling fluid from the head-side cooling jacket 36 is supplied from the introduction passage portion 50b to the fourth notch 52, the first divided cooling jacket 49a, the seventh notch 55, the second divided cooling jacket 49b, and the eighth. It will flow into the discharge passage 50c through the notch 56. That is, during high-load operation of the internal combustion engine EB, the cooling fluid derived from the head-side jacket 36 circulates in order through the first and second split cooling jackets 49a and 49b of the block-side jacket 49.
　この第２の実施の形態によっても、上記第１の実施の形態と同様の効果を奏することができ、また前記制御弁５１に、当該制御弁５１を前記直線状通路部５０ａで軸線まわりに回動させ得るアクチュエータ５８が連結されるので、簡潔な構造で冷却流体の制御を行なうことができる。 The same effect as that of the first embodiment can be obtained by this second embodiment, and the control valve 51 is rotated around the axis by the linear passage portion 50a to the control valve 51. Since the actuator 58 that can be moved is connected, the cooling fluid can be controlled with a simple structure.
　以上、本発明の実施の形態について説明したが、本発明は上記実施の形態に限定されるものではなく、その要旨を逸脱することなく種々の設計変更を行うことが可能である。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the gist thereof.
　たとえば上述の実施の形態では、ブロック側冷却ジャケット３５が第１～第３分割冷却ジャケット３５ａ，３５ｂ，３５ｃに分割され、ブロック側冷却ジャケット４９が第１および第２分割冷却ジャケット４９ａ，４９ｂに分割されていたが、４以上の分割冷却ジャケットに分割されていてもよい。 For example, in the above embodiment, the block side cooling jacket 35 is divided into the first to third divided cooling jackets 35a, 35b, 35c, and the block side cooling jacket 49 is divided into the first and second divided cooling jackets 49a, 49b. However, it may be divided into four or more divided cooling jackets.
　さらに複数の分割冷却ジャケット間を、温度が上昇し過ぎないようにするために、流量を絞った少量流冷却流体通路で常時連通させるようにしてもよい。 Further, in order to prevent the temperature from rising too much, the plurality of divided cooling jackets may be constantly communicated with each other through a small flow cooling fluid passage with a reduced flow rate.

Claims (6)

  1. 　シリンダボア（１６）を有するシリンダブロック（１２）に前記シリンダボア（１６）の周囲に配置されるブロック側冷却ジャケット（３５，４９）が設けられ、前記シリンダボア（１６）に摺動自在に嵌合されるピストン（１５）の頂部を臨ませる燃焼室（１７）を前記シリンダブロック（１２）との間に形成して当該シリンダブロック（１２）に結合されるシリンダヘッド（１３）に、前記燃焼室（１７）の周囲に配置されるヘッド側冷却ジャケット（３６）が設けられ、前記ブロック側冷却ジャケット（３５，４９）および前記ヘッド側冷却ジャケット（３６）に冷却流体を流通させるようにした内燃機関の冷却構造において、前記ヘッド側冷却ジャケット（３６）からの冷却流体を前記ブロック側冷却ジャケット（３５）側に導く冷却流体通路（３８，５０）に、前記ブロック側冷却ジャケット（３５）での冷却流体の流通を制御する制御弁（３９，５１）が設けられることを特徴とする内燃機関の冷却構造。 The cylinder block (12) having the cylinder bore (16) is provided with block-side cooling jackets (35, 49) arranged around the cylinder bore (16), and is slidably fitted to the cylinder bore (16). The combustion chamber (17) is formed in the cylinder head (13) formed between the combustion chamber (17) facing the top of the piston (15) and the cylinder block (12), and is coupled to the cylinder block (12). ) Is provided around the head side cooling jacket (36), and the cooling fluid is circulated through the block side cooling jackets (35, 49) and the head side cooling jacket (36) to cool the internal combustion engine. In the structure, the cooling fluid from the head-side cooling jacket (36) is led to the block-side cooling jacket (35) side in the cooling fluid passages (38, 50), and the cooling fluid from the block-side cooling jacket (35) is connected to the cooling fluid passages (38, 50). A cooling structure for an internal combustion engine, characterized in that a control valve (39, 51) for controlling flow is provided.
  2. 　前記ブロック側冷却ジャケット（３５，４９）は、前記シリンダボア（１６）の軸線（Ｃ）に沿う方向で分割されるとともに前記冷却流体通路（３８，５０）で相互に連通可能な複数の分割冷却ジャケット（３５ａ，３５ｂ，３５ｃ；４９ａ，４９ｂ）から成ることを特徴とする請求項１に記載の内燃機関の冷却構造。 The block-side cooling jackets (35, 49) are divided along the axis (C) of the cylinder bore (16), and a plurality of divided cooling jackets that can communicate with each other in the cooling fluid passage (38, 50). The cooling structure for an internal combustion engine according to claim 1, further comprising (35a, 35b, 35c; 49a, 49b).
  3. 　前記冷却流体通路（３８，５０）の一部を構成して前記シリンダボア（１６）の軸線（Ｃ）と平行に延びる直線状通路部（３８ａ，５０ａ）内に、当該直線状通路部（３８ａ，５０ａ）の軸線方向に延びる前記制御弁（３９，５１）が挿入されることを特徴とする請求項１または２に記載の内燃機関の冷却構造。 The linear passage portion (38a, 50a) forms a part of the cooling fluid passage (38, 50) and extends in parallel with the axis (C) of the cylinder bore (16). The cooling structure for an internal combustion engine according to claim 1 or 2, wherein the control valve (39, 51) extending in the axial direction of 50a) is inserted.
  4. 　前記制御弁（３９）が、棒状である制御弁主部（３９ａ）に切欠き（４１，４２，４３）が設けられて成ることを特徴とする請求項１～３のいずれか１項に記載の内燃機関の冷却構造。 The invention according to any one of claims 1 to 3, wherein the control valve (39) is provided with a notch (41, 42, 43) in a rod-shaped control valve main portion (39a). Internal combustion engine cooling structure.
  5. 　前記制御弁（３９）に、当該制御弁（３９）を前記直線状通路部（３８ａ）の軸線方向に移動させ得るアクチュエータ（４４）が連結されることを特徴とする請求項２～４のいずれか１項に記載の内燃機関の冷却構造。 Any of claims 2 to 4, wherein an actuator (44) capable of moving the control valve (39) in the axial direction of the linear passage portion (38a) is connected to the control valve (39). The cooling structure of the internal combustion engine according to item 1.
  6. 　前記制御弁（５１）に、当該制御弁（５１）を前記直線状通路部（５０ａ）内で軸線まわりに回動させ得るアクチュエータ（５８）が連結されることを特徴とする請求項２または３に記載の内燃機関の冷却構造。 Claim 2 or 3 is characterized in that an actuator (58) capable of rotating the control valve (51) around the axis in the linear passage portion (50a) is connected to the control valve (51). The cooling structure of the internal combustion engine described in.
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