JP6544258B2 - Internal combustion engine temperature control device - Google Patents

Description

  The present invention relates to a temperature control device for an internal combustion engine in which a spacer is provided in a water jacket.

  As a document in which a conventional cooling device for an internal combustion engine is disclosed, there is JP-A-2006-90195 (Patent Document 1).

  In the cooling device for an internal combustion engine disclosed in Patent Document 1, a spacer that divides the inner passage and the outer passage is disposed in the water jacket, and the spacer is moved so that the inner passage narrows in a cold state.

  As a result, the amount of cooling water flowing into the inner passage is reduced, so that the heat radiation from the cylinder liner constituting the cylinder bore can be suppressed in the cold state, and the temperature of the cylinder liner can be raised early. As a result, the temperature of the cylinder liner can be reached early to the temperature at which the warm-up operation is completed. When the warm-up operation is completed, the spacer is moved so as to expand the inner passage to exhibit the cooling performance.

JP, 2006-90195, A

  However, in the cooling device for an internal combustion engine disclosed in Patent Document 1, the distance from the cylinder liner to the spacer changes constantly along the depth direction of the water jacket as the spacer moves.

  For this reason, during high load operation of the internal combustion engine, it is not possible to actively cool the side particularly close to the engine head which becomes high temperature, and the cooling capacity is lowered. In such a case, the amount of evaporation and consumption of oil will increase.

  Also, in the cold state, while raising the temperature of the cylinder liner in a portion between the top dead center and the bottom dead center of the piston moving in the cylinder bore and located near the central region where the speed of the piston increases. Adjustment can not be performed, such as efficiently cooling the side close to the engine head. For this reason, the temperature of the cylinder liner is generally increased, which also increases the amount of evaporation and consumption of oil.

  The present invention has been made in view of the above problems, and an object of the present invention is to make the temperature distribution of the bore wall in a direction parallel to the depth direction of the water jacket a desired temperature distribution. An object of the present invention is to provide a temperature control device for an internal combustion engine.

  The temperature control device for an internal combustion engine according to the present invention corresponds to a cylinder block in which a water jacket is formed around a bore wall forming a cylinder bore, and a plurality of regions divided along the depth direction of the water jacket. And a plurality of water jacket spacers disposed adjacent to each other in the water jacket and spaced apart from the bore wall so as to be expandable and contractible so as to vary the distance from the bore wall And a plurality of movable bodies that expand and contract each of the plurality of water jacket spacers, and a movement amount adjustment unit that independently adjusts the movement amounts of the plurality of movable bodies.

  In the temperature control device for an internal combustion engine according to the present invention, the cylinder block preferably includes a base portion disposed outside the water jacket and facing the bore wall portion. It is preferable that a resin layer is provided on the wall surface of the specified base portion. Further, each of the plurality of water jacket spacers is preferably joined to the resin layer in a state in which the movable body is accommodated therein.

  In the temperature control device for an internal combustion engine based on the present invention, each of the plurality of moving bodies may be configured by a piezoelectric element provided so as to be able to expand and contract, and the movement amount adjustment unit The control unit may be configured to be electrically connected to the element. In this case, it is preferable that the control unit adjust the amount of expansion and contraction of the piezoelectric element by adjusting the current flowing through the piezoelectric element.

  In the temperature control system for an internal combustion engine according to the present invention, the control unit estimates the temperature of the bore wall corresponding to each of a plurality of regions divided along the depth direction of the water jacket. It is preferable to adjust the current flowing through the piezoelectric element based on the estimated temperature of the bore wall.

  In the temperature adjusting device for an internal combustion engine based on the present invention, each of the plurality of moving bodies may include a pressing member provided to be able to press the water jacket spacer, and the moving amount adjusting unit The actuator may be constituted by a plurality of actuators for moving the pressing member.

  In the temperature control system for an internal combustion engine according to the present invention, the bore wall is provided inside the bore wall and corresponds to a plurality of regions divided along the depth direction of the water jacket. A plurality of temperature detection units that detect the temperature of In this case, it is preferable that the plurality of actuators adjust the movement amounts of the plurality of moving bodies based on the temperature information detected by the plurality of temperature detection units.

  In the temperature control device for an internal combustion engine based on the present invention, the travel adjustment portion is disposed at the side closest to the engine head at high load of the engine, the water jacket spacer and the bore wall portion It is preferable to adjust the amount of movement of the plurality of movable bodies such that the distance between the two is larger than the distance between the other water jacket and the bore wall.

  In the temperature control device for an internal combustion engine according to the present invention, the water jacket preferably has an upper region, a middle region, and a lower region from the side closer to the engine head along the depth direction. In this case, it is preferable that the water jacket spacer is disposed in each of the upper region, the middle region, and the lower region.

  In the temperature control system for an internal combustion engine according to the present invention, the length of the water jacket spacer disposed in the upper region is in the middle region in the direction parallel to the depth direction of the water jacket. Preferably, the length of the water jacket spacer shorter than the length of the water jacket spacer disposed is shorter than the length of the water jacket spacer disposed in the lower area.

  According to the present invention, it is possible to provide a temperature control device of an internal combustion engine capable of making the temperature distribution of the bore wall in a direction parallel to the depth direction of the water jacket a desired temperature distribution.

1 is a perspective view of a temperature adjustment device for an internal combustion engine according to Embodiment 1. FIG. FIG. 1 is a longitudinal sectional view of a temperature control device for an internal combustion engine according to a first embodiment. FIG. 1 is a cross-sectional view of a temperature control device for an internal combustion engine according to a first embodiment. FIG. 5 is a longitudinal cross-sectional view showing the position of the water jacket spacer at the time of high load of the internal combustion engine in the temperature adjustment device for an internal combustion engine according to Embodiment 1. It is a figure which shows the temperature distribution of the bore wall in the direction parallel to the depth direction of the water jacket at the time of the high temperature load of an internal combustion engine. FIG. 5 is a longitudinal cross-sectional view showing the position of the water jacket spacer in the cold state of the internal combustion engine in the temperature adjustment device for an internal combustion engine according to Embodiment 1; It is a figure which shows the temperature distribution of the bore wall in the direction parallel to the depth direction of the water jacket at the time of the cold state of an internal combustion engine. FIG. 6 is a longitudinal cross-sectional view of a temperature adjustment device for an internal combustion engine according to a second embodiment. FIG. 10 is a longitudinal cross-sectional view of a temperature adjustment device for an internal combustion engine according to Embodiment 3.

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

Embodiment 1
(Temperature control device for internal combustion engine)
FIG. 1 is a perspective view of a temperature control device for an internal combustion engine according to a first embodiment. FIG. 2 is a longitudinal sectional view of the temperature control system for an internal combustion engine according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II shown in FIG. In FIG. 1, the engine head is indicated by a two-dot chain line, and a part of the engine head is omitted for convenience. A temperature control device 100 for an internal combustion engine according to a first embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, a temperature control device 100 for an internal combustion engine is for cooling an internal combustion engine provided with an engine head 5 and a cylinder block 10. The temperature control device 100 for an internal combustion engine is mainly for cooling a bore wall portion 11 which constitutes cylinder bores 1a, 1b, 1c described later.

  As shown in FIGS. 1 and 2, the temperature control device 100 for an internal combustion engine includes a cylinder block 10, a plurality of water jacket spacers 21, 22, 23 and a plurality of pressing members 31, 32 as a plurality of moving bodies. 33, a movement adjustment unit 40, and a plurality of temperature detection units 71, 72, 73.

  The cylinder block 10 includes a bore wall 11, a water jacket 12, and a base 13.

  The bore wall portion 11 is provided on the inner peripheral side of the cylinder block 10. The bore wall portion 11 constitutes cylinder bores 1a, 1b, 1c having a substantially cylindrical shape. A piston 60 is disposed in an area surrounded by the bore wall 11.

  Bore wall 11 is formed of, for example, a plurality of cylinder liners. Specifically, the bore wall portion 11 is constituted of a cylinder liner made of iron and an aluminum alloy surrounding the cylinder liner.

  The water jacket 12 opens toward the engine head 5 and has a concave shape having a predetermined depth. The water jacket 12 is formed around the bore wall 11. The water jacket 12 is provided so as to surround the bore wall 11.

  The water jacket 12 is located between the bore wall 11 and the base 13. The water jacket 12 has a bottom, in which the bore wall 11 and the base 13 are joined. Cooling water flows through the water jacket 12. Thus, the temperature of the bore wall 11 is adjusted by the cooling water.

  The water jacket 12 has a plurality of regions divided along its depth direction. For example, the water jacket 12 has an upper region R1, a middle region R2 and a lower region R3 from the side closer to the engine head 5 along the depth direction.

  The base 13 is disposed outside the water jacket 12 and faces the bore wall 11. Base portion 13 is formed of, for example, an aluminum alloy. The base portion 13 is provided with a cooling water inlet (not shown). Cooling water is introduced into the inlet of the cooling water from a water pump (not shown).

  The plurality of water jacket spacers 21, 22, 23 are disposed in the water jacket 12. The plurality of water jacket spacers 21, 22, 23 are arranged adjacent to each other without forming a gap corresponding to a plurality of areas divided along the depth direction of the water jacket 12.

  The water jacket spacer 21 is disposed in the upper region R 1 of the water jacket 12. The water jacket spacer 22 is disposed in the central region R2 of the water jacket 12. The water jacket spacer 23 is disposed in the lower region R3 of the water jacket 12.

  The plurality of water jacket spacers 21, 22, 23 are disposed apart from the bore wall 11. The plurality of water jacket spacers 21, 22, 23 are provided so as to be expandable and contractible so that the distance from the bore wall 11 can be varied. The plurality of water jacket spacers 21, 22, 23 are formed of a stretchable member such as rubber, for example.

  The plurality of water jacket spacers 21, 22, 23 are joined to the resin layer 50 provided on the wall surface 13 a of the base portion 13.

  The resin layer 50 improves the bondability between the plurality of water jacket spacers 21, 22, 23 and the base portion 13. The resin layer 50 is preferably excellent in heat resistance and water resistance.

  The plurality of pressing members 31, 32, 33 are accommodated in the plurality of water jacket spacers 21, 22, 23. The plurality of pressing members 31, 32, and 33 are configured to be able to press the plurality of water jacket spacers 21, 22, and 23. The plurality of pressing members 31, 32, and 33 expand and contract the water jacket spacers 21, 22, and 23 as described later.

  The movement adjustment unit 40 is configured of a plurality of actuators 41, 42, 43. The plurality of actuators 41, 42, 43 have drive shafts 41a, 42a, 43a. The drive shafts 41a, 42a, 43a penetrate the base portion 13 of the cylinder block 10 and are connected to the pressing members 31, 32, 33.

  When the plurality of actuators 41, 42, 43 are driven, the drive shafts 41a, 42a, 43a move in their axial directions. The pressing members 31, 32, and 33 move along with the movement of the drive shafts 41a, 42a, and 43a. The plurality of actuators 41, 42, 43 respectively adjust the movement amounts of the plurality of pressing members 31, 32, 33 by adjusting the movement amounts of the drive shafts 41a, 42a, 43a.

  The plurality of actuators 41, 42, 43 may be, for example, hydraulic cylinders, or may be a combination of a motor and a mechanism that changes the rotational movement of the motor to linear movement of the drive shafts 41a, 42a, 43a. . Further, the plurality of actuators 41, 42, 43 may be constituted by piezoelectric elements having different amounts of deformation depending on the magnitude of the flowing current, or may be constituted by thermally deformable members such as bimetals having different amounts of deformation depending on the amount of heat applied. It may be

  The plurality of actuators 41, 42, 43 respectively adjust the movement amounts of the plurality of pressing members 31, 32, 33 based on the temperature information detected by the plurality of temperature detection units 71, 72, 73. For example, when the detected temperature is high, the plurality of actuators 41, 42, 43 have a small movement amount from the initial position, and when the detected temperature is low, the movement amount from the initial position is large. The plurality of pressing members 31, 32, and 33 are moved.

  The plurality of temperature detection units 71, 72, 73 are provided inside the bore wall 11. The plurality of temperature detection units 71, 72, 73 detect the temperature of the bore wall portion 11 corresponding to the plurality of regions divided along the depth direction of the water jacket 12. The plurality of temperature detection units 71, 72, 73 are configured by, for example, a thermocouple, a thermistor or the like.

  The temperature detection unit 71 detects the temperature of the bore wall 11 at a portion corresponding to the upper region R1 of the water jacket 12. The temperature detection unit 72 detects the temperature of the bore wall 11 in a portion corresponding to the middle region R2 of the water jacket 12. The temperature detection unit 73 detects the temperature of the bore wall 11 at a portion corresponding to the lower region R3 of the water jacket 12. The plurality of temperature detection units 71, 72, 73 input the detected temperature information to the plurality of actuators 41, 42, 43.

(Detailed configuration of water jacket spacer and its movement)
FIG. 3 is a cross-sectional view of the temperature control device for an internal combustion engine according to the first embodiment. The detailed configuration of the water jacket spacer 21 according to the first embodiment and the movement thereof will be described with reference to FIG.

  As shown in FIG. 3, the water jacket spacer 21 has a bag-like shape that opens toward the inner wall surface 13 a of the base portion 13. The water jacket spacer 21 has side walls 211 and 212, an upper wall 213 (see FIG. 2), a lower wall 214 (see FIG. 2), and a main wall 215.

  The main wall portion 215 extends along the inner wall surface 13 a of the base portion 13. The main wall portion 215 is provided to connect one end sides of the side wall portions 211 and 212, the upper wall portion 213, and the lower wall portion 214.

  The other end sides of the side wall portions 211 and 212, the upper wall portion 213, and the lower wall portion 214 are joined to the resin layer 50. By providing at least the side wall portions 211 and 212, the upper wall portion 213, and the lower wall portion 214 in an expandable manner, the water jacket spacer 21 has elasticity.

  The water jacket spacer 21 accommodates therein a plurality of pressing members 31 as a movable body. The plurality of pressing members 31 are provided to be able to press the inner surface of the main wall portion 215. The plurality of pressing members 31 are provided along the main wall portion 215.

  The plurality of pressing members 31 are disposed apart from one another. The plurality of pressing members 31 are arranged corresponding to the cylinder bores 1a, 1b, 1c. The plurality of pressing members 31 are connected to a drive shaft 41 a described later provided so as to penetrate the base portion 13 of the cylinder block 10.

  When the main wall portion 215 is pressed by the plurality of pressing members 31, the water jacket spacer 21 extends and approaches the bore wall portion 11. On the other hand, when the plurality of pressing members 31 move in the direction away from the bore wall 11, the water jacket spacer 21 contracts and gets away from the bore wall 11.

  In addition, it is not limited to when the several pressing member 31 is accommodated in water jacket spacer 21 inside, A single pressing member may be accommodated. In this case, the pressing member extends along the main wall portion 215 so as to face each other from the cylinder bore 1a to the cylinder bore 3a.

  The water jacket spacers 22 and 23 also have substantially the same configuration as the water jacket spacer 21. When the water jacket spacers 22 and 23 are pressed by the plurality of pressing members 32 and 33, they extend and approach the bore wall 11, and the plurality of pressing members 32 and 33 move in the direction away from the bore wall 11. As a result, they contract and move away from the bore wall 11.

(Position of water jacket spacer at high load of internal combustion engine)
FIG. 4 is a longitudinal sectional view showing the position of the water jacket spacer at the time of high load of the internal combustion engine in the temperature control system for an internal combustion engine according to the first embodiment. The position of the water jacket spacer at high load of the internal combustion engine will be described with reference to FIG.

  At a high load of the internal combustion engine, the number of times of fuel combustion increases between the engine head 5 and the cylinder block 10, so the temperature on the upper side of the cylinder block 10 becomes high. Therefore, the temperature detected by the temperature detection unit 71 on the upper side of the cylinder block 10 is higher than the temperature detected by the temperature detection units 72 and 73 on the middle and lower sides of the cylinder block 10.

  Based on such temperature information, at the time of a high load of the internal combustion engine, the movement adjustment section 40 (the plurality of actuators 41, 42, 43) is a water jacket spacer disposed on the side closest to the engine head 5. 21. The moving amounts of the plurality of pressing members 31, 32, 33 so that the distance between 21 and the bore wall 11 is wider than the distance between the other water jacket spacers 22, 23 and the bore wall 11. Adjust the

  In this case, the water jacket spacer 21 disposed in the upper region R1 may not be moved from the initial position located on the base 13 side to the bore wall 11 side, or on the bore wall 11 side. It may be moved to a considerable extent.

  On the other hand, the water jacket spacer 22 disposed in the middle region R2 and the water jacket spacer 23 disposed in the lower region R3 are moved to a position closer to the bore wall 11. The water jacket spacer 23 is moved short (so that the distance from the bore wall 11 is wide) as compared with the water jacket spacer 22. The water jacket spacer 23 may be moved by the same amount as the water jacket spacer 22.

  By moving the water jacket spacers 21, 22, 23 in this manner, the flow rate of the cooling water flowing through the upper region R1 of the water jacket 12 is greater than the flow rate of the cooling water flowing through the middle region R2 and the lower region R3 of the water jacket 12. Will also increase.

  Thereby, the bore wall portion 11 of the portion corresponding to the upper region R1 can be cooled efficiently. As a result, the amount of evaporation and consumption of the oil filled in the cylinder bores 1a, 1b, 1c can be suppressed.

(Bore wall temperature distribution at high load of internal combustion engine)
FIG. 5 is a view showing the temperature distribution of the bore wall in the direction parallel to the depth direction of the water jacket at the time of high load of the internal combustion engine. The temperature distribution of the bore wall portion 11 at the time of high load of the internal combustion engine will be described with reference to FIG.

  In FIG. 5, the temperature distribution of the bore wall 11 in the embodiment is indicated by a solid line, and the temperature distribution of the bore wall 11 in the comparative example is indicated by a broken line.

  In the embodiment and the comparative example, the distance from the bore wall portion 11 to the water jacket spacer 21 is made the largest in the upper region R1 for the purpose of cooling the bore wall portion 11 in the portion corresponding to the upper region R1. ing. When the embodiment and the comparative example are compared, the distances from the water jacket spacer to the bore wall 11 in the middle region R2 and the lower region R3 are different.

  As an example, as described above, the water jacket spacers 21, 22, and 23 are moved independently so that the distance between the water jacket spacer 21 and the bore wall 11 is the widest.

  On the other hand, as a comparative example, the case where the conventional water jacket spacer which is not divided in the depth direction of the water jacket is used is shown. In this comparative example, the water jacket spacer of the conventional structure is such that the distance from the bore wall 11 to the water jacket spacer of the conventional structure is equal to the distance from the bore wall 11 to the water jacket spacer 21 of the embodiment. Is moving.

  In the case of the embodiment, as described above, the flow rate of the cooling water flowing in the upper region R1 of the water jacket 12 is increased, and the bore wall portion 11 of the portion corresponding to the upper region R1 can be cooled efficiently. As a result, the temperature distribution of the bore wall portion 11 in the direction parallel to the depth direction of the water jacket 12 becomes substantially constant.

  On the other hand, in the case of the comparative example, the flow rate in the water jacket 12 in the depth direction of the water jacket 12 is substantially constant. That is, the flow rate of the cooling water is substantially constant in the upper region R1, the middle region R2, and the lower region R3. As a result, the bore wall portion 11 in the portion corresponding to the upper region R1 can not be cooled efficiently, and the cooling efficiency on the upper region R1 side is reduced. In addition, the bore wall 11 in a portion corresponding to the middle region R2 and the lower region R3 is excessively cooled, and the flow resistance when moving the piston 60 is increased.

(Position of water jacket spacer in cold condition of internal combustion engine)
FIG. 6 is a longitudinal sectional view showing the position of the water jacket spacer in the cold state of the internal combustion engine in the temperature control system for an internal combustion engine according to the first embodiment. The position of the water jacket spacer in the cold state of the internal combustion engine will be described with reference to FIG.

  When the internal combustion engine is in a cold state, the temperature in the cylinder bores 1a, 1b, 1c is also low, and when the piston 60 is moved, the flow resistance becomes large. For this reason, it is required to reduce the flow resistance at least in a portion corresponding to the middle region R2 where the speed of the piston 60 is increased. For this reason, it is preferable to raise the temperature of the bore wall part 11 of the part corresponding to middle region R2.

  Further, as the fuel is burned between the engine head 5 and the cylinder block 10, the temperature on the upper side of the cylinder block 10 is increased. In order to reduce the amount of evaporation and consumption of oil from the upper side of the cylinder bores 1a, 1b, 1c, it is preferable to lower the temperature on the upper side of the cylinder block 10.

  When the temperature detection unit 71, 72, 73 lowers the temperature of the bore wall 11, and it can be determined that it is in the cold state, the movement adjustment unit 40 (a plurality of actuators 41, 42, 43) The water jacket spacer 21 and the bore wall 11 are disposed on the side closest to the engine head 5 among all the distances between the plurality of water jacket spacers 21, 22 and 23 and the bore wall 11. The plurality of pressing members 31, so that the distance between the two is the widest and the distance between the water jacket spacer 22 and the bore wall portion 11 in the portion corresponding to the central region of the movement range of the piston 60 is the narrowest. Adjust the moving amount of 32, 33.

  In this case, the water jacket spacer 21 disposed in the upper region R1 may not be moved from the initial position located on the base 13 side to the bore wall 11 side, or on the bore wall 11 side. It may be moved to a considerable extent.

  On the other hand, the water jacket spacer 22 disposed in the middle region R2 and the water jacket spacer 23 disposed in the lower region R3 are moved to a position closer to the bore wall 11. The water jacket spacer 23 is moved short (so that the distance from the bore wall 11 is wide) as compared with the water jacket spacer 22. The water jacket spacer 23 may be moved by the same amount as the water jacket spacer 22.

  The water jacket spacers 22 and 23 in the cold state of the internal combustion engine are moved closer to the bore wall portion 11 than the position (the position shown in FIG. 4) in the high load state of the internal combustion engine.

  By moving the water jacket spacers 21, 22, 23 in this manner, the flow rate flowing through the middle region R2 can be suppressed, and the temperature of the bore wall portion 11 in the portion corresponding to the middle region R2 is efficiently raised. be able to.

  Further, the flow rate of the cooling water flowing through the upper region R1 of the water jacket 12 can be sufficiently secured independently of the middle region R2 and the lower region R3, so the bore wall portion 11 of the portion corresponding to the upper region R1 can be efficiently It can be cooled.

  Furthermore, the distance from the bore wall 11 to the water jacket spacer 23 in the lower region R3 is slightly larger than the distance from the bore wall 11 to the water jacket spacer 22 in the middle region R2 to correspond to the lower region R3. It can suppress that the temperature of the bore wall part 11 of a part raises excessively.

  As a result, the oil filled in the cylinder bores 1a, 1b, 1c can be prevented from being evaporated and consumed from the upper side. Further, the temperature of the central portion of the oil filled in the cylinder bores 1a, 1b, 1c can be increased, and the flow resistance by the oil can be reduced in the region where the speed of the piston 60 is increased.

(Bore wall temperature distribution in cold condition of internal combustion engine)
FIG. 7 is a view showing the temperature distribution of the bore wall in the direction parallel to the depth direction of the water jacket when the internal combustion engine is in the cold state. The temperature distribution of the bore wall 11 in the cold state of the internal combustion engine will be described with reference to FIG. 7.

  In FIG. 7, the temperature distribution of the bore wall portion 11 in the embodiment is indicated by a solid line, and the temperature distribution of the bore wall portion 11 in the comparative example is indicated by a broken line.

  In the embodiment and the comparative example, the distance from the bore wall 11 to the water jacket spacer 22 is made the narrowest in the middle region R2 in order to keep the bore wall 11 in a portion corresponding to the middle region R2 warm. ing. When the embodiment and the comparative example are compared, the distances from the water jacket spacer to the bore wall 11 in the upper region R1 and the lower region R3 are different.

  As an example, among all the distances between the water jacket spacers 21, 22, and 23 and the bore wall 11, the distance between the water jacket spacer 21 and the bore wall 11 is the largest, and the water The water jacket spacers 21, 22, 23 are moved independently so that the distance between the jacket spacer 22 and the bore wall 11 is the narrowest.

  On the other hand, as a comparative example, the case where the conventional water jacket spacer which is not divided in the depth direction of the water jacket is used is shown. In this comparative example, the water jacket spacer of the conventional structure is such that the distance from the bore wall 11 to the water jacket spacer of the conventional structure is equal to the distance from the bore wall 11 to the water jacket spacer 22 of the embodiment. Is moving.

  In the case of the embodiment, as described above, the flow rate of the cooling water flowing in the upper region R1 of the water jacket 12 is increased, and the bore wall portion 11 of the portion corresponding to the upper region R1 can be cooled efficiently. Further, by suppressing the flow rate flowing through the middle region R2, the temperature of the bore wall portion 11 in the portion corresponding to the middle region R2 can be efficiently raised.

  Thereby, the temperature distribution of the bore wall 11 in the direction parallel to the depth direction of the water jacket 12 becomes substantially constant.

  The temperature of the bore wall portion 11 in the portion corresponding to the upper region R1 may be adjusted to be lower than the temperature of the bore wall portion 11 in the portion corresponding to the middle region R2. Similarly, the temperature of the bore wall portion 11 in the portion corresponding to the lower region R3 may be adjusted to be lower than the temperature of the bore wall portion 11 in the portion corresponding to the middle region R2.

  On the other hand, in the case of the comparative example, the flow rate in the water jacket 12 in the depth direction of the water jacket 12 is substantially constant. That is, the flow rate of the cooling water is substantially constant in the upper region R1, the middle region R2, and the lower region R3. As a result, the bore wall portion 11 in the portion corresponding to the upper region R1 can not be cooled efficiently, and the cooling efficiency on the upper region R1 side is reduced. On the other hand, the temperature of the bore wall portion 11 in the portion corresponding to the middle region R2 is substantially equal to the temperature of the embodiment. However, the temperature of the bore wall 11 in the portion corresponding to the lower region R3 is higher than the temperature of the bore wall 11 in the portion corresponding to the middle region R2, and the cooling efficiency also decreases in the lower region R3.

  As described above, in the comparative example, the temperature of the bore wall portion 11 in the portion corresponding to the middle region R2 can be set to a desired temperature, but compared with the example, the upper region R1 side and the lower region R3 The side is hot. As a result, the oil filled in the cylinder bores 1a, 1b, 1c is evaporated and easily consumed.

  As described above, in temperature control device 100 for an internal combustion engine according to the first embodiment, water jacket 12 is adjacent to each other corresponding to a plurality of areas divided along the depth direction of water jacket 12. Are configured to be expanded and contracted by a plurality of pressing members 31, 32, and 33, and are moved according to the state of the internal combustion engine at high load or in a cold state. By appropriately adjusting the moving amounts of the plurality of pressing members 31, 32, and 33 by the amount adjusting unit 40, the temperature distribution of the bore wall portion 11 in the direction parallel to the depth direction of the water jacket 12 is made a desired temperature distribution. be able to.

Second Embodiment
(Temperature control device for internal combustion engine)
FIG. 8 is a longitudinal sectional view of a temperature control system for an internal combustion engine according to a second embodiment. A temperature control device 100A for an internal combustion engine according to a second embodiment will be described with reference to FIG.

  When compared with the temperature control apparatus 100 for an internal combustion engine according to Embodiment 1, the temperature control apparatus 100A for an internal combustion engine according to Embodiment 2 includes a plurality of moving bodies 31A, 32A, 33A and a movement adjustment section. And temperature detection units 71, 72, 73 are not provided. The other configurations are almost the same.

  As shown in FIG. 8, in the temperature adjustment device 100A according to the second embodiment, the movable bodies 31A, 32A, and 33A are configured by piezoelectric elements provided so as to be expandable and contractible. The moving bodies 31A, 32A, and 33A expand and contract in the direction in which the bore wall 11 and the base 13 are aligned, according to the magnitude of the flowing current.

  The movement amount adjustment unit is configured by the control unit 80 connected to the moving bodies 31A, 32A, and 33A. Control unit 80 is, for example, an engine control unit that controls the operation of the internal combustion engine.

  The control unit 80 estimates the temperature of the bore wall 11 in a portion corresponding to each of a plurality of regions divided along the depth direction of the water jacket 12 and uses the estimated temperature of the bore wall 11 in each portion. Based on this, the currents flowing to the moving bodies 31A, 32A, 33A are adjusted respectively.

  The control unit 80 estimates the temperature of the bore wall 11 at a portion corresponding to each of a plurality of regions divided along the depth direction of the water jacket 12 based on the number of revolutions of the engine and the load of the engine.

  Even in the temperature control device 100A for an internal combustion engine configured as described above, control is performed in the same manner as the temperature control device 100 for an internal combustion engine according to the first embodiment at high load of the internal combustion engine and at cold state of the internal combustion engine. The unit 80 adjusts the moving amounts of the moving bodies 31A, 32A, 33A independently.

  Also in the second embodiment, according to the state of the internal combustion engine, the movement amount adjustment unit 40 appropriately adjusts the movement amounts of the plurality of moving bodies 31A, 32A, 33A, thereby paralleling the water jacket 12 in the depth direction. The temperature distribution of the bore wall 11 in the direction can be a desired temperature distribution.

Third Embodiment
FIG. 9 is a longitudinal sectional view of a temperature control system for an internal combustion engine according to a third embodiment. A temperature control device 100B for an internal combustion engine according to a third embodiment will be described with reference to FIG.

  As shown in FIG. 9, the temperature control apparatus 100B for an internal combustion engine according to the third embodiment is parallel to the depth direction of the water jacket 12 when compared with the temperature control apparatus 100A for an internal combustion engine according to the second embodiment. The lengths of the water jacket spacers 21, 22 and 23 in different directions are different. The other configurations are almost the same.

  In a direction parallel to the depth direction of the water jacket 12, the length L1 of the water jacket spacer 21 disposed in the upper region R1 is shorter than the length L2 of the water jacket spacer 22 disposed in the middle region R2. There is.

  In a direction parallel to the depth direction of the water jacket 12, the length L2 of the water jacket spacer 21 disposed in the middle region R2 is shorter than the length L3 of the water jacket spacer 23 disposed in the lower region R3. There is.

  Even in the temperature control device 100B for an internal combustion engine configured as described above, control is performed in the same manner as the temperature control device 100 for an internal combustion engine according to the first embodiment at high load of the internal combustion engine and at cold state of the internal combustion engine. The unit 80 adjusts the moving amounts of the moving bodies 31A, 32A, 33A independently.

  Thereby, even in the temperature control apparatus 100B for an internal combustion engine according to the third embodiment, an effect equal to or higher than that of the temperature control apparatus 100A for an internal combustion engine according to the second embodiment can be obtained.

  In addition, by setting the length relationship of the water jacket spacers 21, 22, 23 as described above, the flow rate flowing through the upper region R1, the middle region R2 and the lower region R3 can be adjusted more properly.

  In the first to third embodiments described above, the case where the water jacket 12 is divided into three, that is, the upper region R1, the middle region R2 and the lower region R3 along the depth direction is described. It is not limited to this, and may be divided into two, or may be divided into four or more. In this case, a plurality of water jacket spacers and a plurality of moving bodies are provided corresponding to the divided numbers.

  In the first to third embodiments described above, the case where three cylinder bores are formed in the cylinder block 1 is described as an example, but the invention is not limited thereto, and the number of cylinder bores is one or more. Good.

  Further, as internal combustion engines to which the present invention is applied, there are gasoline engines, diesel engines, etc., and the present invention is applied to various engines such as in-line type, V-type, W-type and horizontally opposed type as engines. be able to.

  As mentioned above, although embodiment of this invention was described, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is indicated by the claims, and includes all the modifications within the meaning and the scope equivalent to the claims.

  1a, 1b, 1c cylinder bore, 5 engine head, 10 cylinder block, 11 bore wall, 12 water jacket, 13 base, 13a wall, 21, 22, 23 water jacket spacer, 31, 32, 33 pressing member, 31A, 32A, 33A moving body, 40 movement amount adjustment unit, 41, 42, 43 actuators, 41a, 42a, 43a drive shaft, 50 resin layers, 60 pistons, 71, 72, 73 temperature detection units, 80 control units, 100, 100A , 100B temperature control device, 211, 212 side wall, 213 upper wall, 214 lower wall, 215 main wall.

Claims (10)

A cylinder block in which a water jacket is formed around a bore wall constituting the cylinder bore;
The water jackets are disposed adjacent to each other in the water jacket in correspondence with a plurality of regions divided along the depth direction of the water jacket, and are spaced apart from the bore wall, and from the bore wall A plurality of water jacket spacers provided so as to be stretchable so that the distance of
A plurality of moving bodies that expand and contract each of the plurality of water jacket spacers;
E Bei and a movement amount adjustment unit that adjusts a movement amount of the plurality of mobile independently,
Each of the plurality of moving bodies includes a pressing member provided to be able to press the water jacket spacer,
The movement amount adjustment unit is configured by a plurality of actuators for moving the pressing member,
It further comprises a plurality of temperature detection units provided inside the bore wall and detecting temperatures of the bore wall respectively corresponding to a plurality of regions divided along the depth direction of the water jacket,
The plurality of actuators adjust the movement amounts of the plurality of moving bodies, respectively, based on the temperature information detected by the plurality of temperature detection units,
The water jacket has an upper region, a middle region, and a lower region from the side closer to the engine head along the depth direction,
A temperature control device for an internal combustion engine , wherein the water jacket spacer is disposed in each of the upper region, the middle region, and the lower region . The cylinder block includes a base portion disposed outside the water jacket and facing the bore wall portion.
A resin layer is provided on the wall surface of the base portion that defines the water jacket,
The temperature control device for an internal combustion engine according to claim 1, wherein each of the plurality of water jacket spacers is joined to the resin layer in a state in which the movable body is accommodated therein. The moving amount adjusting unit is configured such that the distance between the water jacket spacer disposed on the side closest to the engine head and the bore wall portion at the time of high load on the engine corresponds to the other water jacket and the bore wall The temperature control device for an internal combustion engine according to claim 1 or 2 , wherein the moving amounts of the plurality of moving bodies are adjusted so as to be larger than the distance between the parts. In the direction parallel to the depth direction of the water jacket, the length of the water jacket spacer disposed in the upper region is shorter than the length of the water jacket spacer disposed in the middle region, and the middle region The temperature control device for an internal combustion engine according to any one of claims 1 to 3 , wherein a length of the water jacket spacer disposed in the lower region is shorter than a length of the water jacket spacer disposed in the lower region. A cylinder block in which a water jacket is formed around a bore wall constituting the cylinder bore;
The water jackets are disposed adjacent to each other in the water jacket in correspondence with a plurality of regions divided along the depth direction of the water jacket, and are spaced apart from the bore wall, and from the bore wall A plurality of water jacket spacers provided so as to be stretchable so that the distance of
A plurality of moving bodies that expand and contract each of the plurality of water jacket spacers;
A movement amount adjustment unit configured to independently adjust movement amounts of the plurality of moving bodies,
Each of the plurality of moving bodies is constituted by a piezoelectric element provided so as to be able to expand and contract,
The movement amount adjustment unit is configured by a control unit electrically connected to the piezoelectric element,
The temperature control device for an internal combustion engine, wherein the control unit adjusts an amount of expansion and contraction of the piezoelectric element by adjusting a current flowing through the piezoelectric element. The cylinder block includes a base portion disposed outside the water jacket and facing the bore wall portion.
A resin layer is provided on the wall surface of the base portion that defines the water jacket,
The temperature control device for an internal combustion engine according to claim 5 , wherein each of the plurality of water jacket spacers is joined to the resin layer in a state in which the movable body is accommodated therein. The control unit estimates the temperature of the bore wall corresponding to each of a plurality of areas divided along the depth direction of the water jacket, and the piezoelectric based on the estimated temperature of the bore wall. The temperature control device for an internal combustion engine according to claim 5 , wherein the current flowing to the element is adjusted. The moving amount adjusting unit is configured such that the distance between the water jacket spacer disposed on the side closest to the engine head and the bore wall portion at the time of high load on the engine corresponds to the other water jacket and the bore wall The temperature control device for an internal combustion engine according to any one of claims 5 to 7 , wherein the moving amounts of the plurality of moving bodies are adjusted so as to be larger than the distance between the parts. The water jacket has an upper region, a middle region, and a lower region from the side closer to the engine head along the depth direction,
The temperature control device for an internal combustion engine according to any one of claims 5 to 8 , wherein the water jacket spacer is disposed in each of the upper region, the middle region, and the lower region. In the direction parallel to the depth direction of the water jacket, the length of the water jacket spacer disposed in the upper region is shorter than the length of the water jacket spacer disposed in the middle region, and the middle region The temperature control device for an internal combustion engine according to claim 9 , wherein a length of the water jacket spacer disposed in the second region is shorter than a length of the water jacket spacer disposed in the lower region.

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