JP2017141796A - Temperature control device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature control device of an internal combustion engine, which can set a temperature distribution of a bore wall in a direction parallel to a depth direction of a water jacket to a desired temperature distribution.SOLUTION: A temperature control device 100 of an internal combustion engine comprises: a cylinder block 10 in which a water jacket 12 is formed around a bore wall part 11 forming a cylinder bore 1a; plural water jacket spacers 21, 22, 23 which are arranged adjacently to one another in the water jacket 12 correspondingly to plural regions R1, R2, R3 divided along the depth direction of the water jacket 12, are arranged apart from the bore wall part 11, and are provided in an extendable and contractable manner; plural moving bodies 31, 32, 33 extending and contracting each of the plural water jacket spacers 21, 22, 23; and a movement amount adjustment part 40 independently adjusting movement amounts of the plural moving bodies 31, 32, 33.SELECTED DRAWING: Figure 4

Description

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

  JP-A-2006-90195 (Patent Document 1) is cited as a document disclosing a conventional cooling device for an internal combustion engine.

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

  As a result, the amount of cooling water flowing in the inner passage is reduced, so that heat release from the cylinder liner constituting the cylinder bore can be suppressed and the temperature of the cylinder liner can be raised quickly during cooling. As a result, the temperature of the cylinder liner can be reached at an early stage to the temperature at which the warm-up operation is completed. When the warm-up operation is completed, the spacer is moved so that the inner passage is widened, and the cooling performance is exhibited.

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, at the time of high load operation of the internal combustion engine, the side close to the engine head that is particularly hot cannot be actively cooled, and the cooling capacity is reduced. In such a case, the amount of oil evaporated and the amount of consumption increase.

  In the cold state, the temperature of the cylinder liner is increased between the top dead center and the bottom dead center of the piston moving in the cylinder bore and in the vicinity of the central region where the speed of the piston increases. Adjustment such as efficient cooling of the side close to the engine head cannot be performed. For this reason, the temperature of the cylinder liner rises as a whole, and this 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.

  An internal combustion engine temperature control device according to the present invention corresponds to a cylinder block in which a water jacket is formed around a bore wall portion constituting a cylinder bore, and a plurality of regions partitioned along the depth direction of the water jacket. A plurality of water jacket spacers disposed adjacent to each other in the water jacket, spaced apart from the bore wall portion, and extendable so that the distance from the bore wall portion is variable. And a plurality of moving bodies that expand and contract each of the plurality of water jacket spacers, and a movement amount adjusting unit that independently adjusts the movement amounts of the plurality of moving bodies.

  In the temperature adjusting device for an internal combustion engine according to the present invention, the cylinder block preferably includes a base portion that is disposed outside the water jacket and faces the bore wall portion. A resin layer is preferably provided on the wall surface of the base portion to be defined. Further, each of the plurality of water jacket spacers is preferably joined to the resin layer in a state where the moving body is accommodated therein.

  In the internal combustion engine temperature adjustment device according to the present invention, each of the plurality of moving bodies may be constituted by a piezoelectric element that is extendable and contractible, and the movement amount adjustment unit is configured by the piezoelectric element. You may be comprised by the control part electrically connected to the element. In this case, it is preferable that the control unit adjusts an expansion / contraction amount of the piezoelectric element by adjusting a current flowing through the piezoelectric element.

  In the internal combustion engine temperature control device according to the present invention, the control unit estimates the temperatures of the bore wall portions respectively corresponding to the plurality of regions divided along the depth direction of the water jacket. The current flowing through the piezoelectric element is preferably adjusted based on the estimated temperature of the bore wall.

  In the internal combustion engine temperature adjusting device according to 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 May be constituted by a plurality of actuators that move the pressing member.

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

  In the temperature adjusting device for an internal combustion engine according to the present invention, the movement amount adjusting portion is arranged on the side closest to the engine head and the bore wall portion when the engine is heavily loaded. It is preferable to adjust the moving amounts of the plurality of moving bodies so that the distance between the moving body and the other water jacket becomes wider than the distance between the bore wall portion.

  In the internal combustion engine temperature control apparatus according to the present invention, the water jacket preferably has an upper region, a middle region, and a lower region from the side close 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 internal combustion engine temperature control device according to the present invention, 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 set in the middle region. It is preferable that the length of the water jacket spacer disposed in the middle region is shorter than the length of the water jacket spacer disposed in the middle region and shorter than the length of the water jacket spacer disposed in the lower region.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature control apparatus of the internal combustion engine which can make the temperature distribution of the bore wall in the direction parallel to the depth direction of a water jacket into a desired temperature distribution can be provided.

1 is a perspective view of a temperature adjustment device for an internal combustion engine according to Embodiment 1. FIG. 1 is a longitudinal sectional view of a temperature adjustment device for an internal combustion engine according to Embodiment 1. FIG. 1 is a cross-sectional view of a temperature control device for an internal combustion engine according to Embodiment 1. FIG. FIG. 3 is a longitudinal sectional view showing the position of a water jacket spacer when the internal combustion engine is at a high load in the internal combustion engine temperature control apparatus according to the first embodiment. It is a figure which shows the temperature distribution of the bore wall in the direction parallel to the depth direction of a water jacket at the time of the high temperature load of an internal combustion engine. FIG. 3 is a longitudinal sectional view showing the position of a water jacket spacer when the internal combustion engine is cold in the internal combustion engine temperature control apparatus according to the first embodiment. 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. 6 is a longitudinal sectional view of a temperature adjustment device for an internal combustion engine according to Embodiment 2. FIG. FIG. 5 is a longitudinal sectional view of a temperature adjustment device for an internal combustion engine according to a third embodiment.

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

(Embodiment 1)
(Temperature adjusting device for internal combustion engine)
1 is a perspective view of a temperature control device for an internal combustion engine according to Embodiment 1. FIG. FIG. 2 is a longitudinal sectional view of the internal combustion engine temperature control apparatus 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 thereof is omitted for convenience. With reference to FIGS. 1 and 2, a temperature control apparatus 100 for an internal combustion engine according to Embodiment 1 will be described.

  As shown in FIG. 1, an internal combustion engine temperature adjustment device 100 is for cooling an internal combustion engine including an engine head 5 and a cylinder block 10. The internal combustion engine temperature adjusting device 100 is mainly for cooling a bore wall portion 11 constituting cylinder bores 1a, 1b, and 1c described later.

  As shown in FIGS. 1 and 2, the internal combustion engine temperature control apparatus 100 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 amount adjustment unit 40, and a plurality of temperature detection units 71, 72, 73.

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

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

  The bore wall portion 11 is constituted by a plurality of cylinder liners, for example. Specifically, the bore wall portion 11 is composed of an iron cylinder liner 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 portion 11.

  The water jacket 12 is located between the bore wall portion 11 and the base portion 13. The water jacket 12 has a bottom portion, and the bore wall portion 11 and the base portion 13 are joined to the bottom portion. Cooling water flows through the water jacket 12. Thereby, the temperature of the bore wall part 11 is adjusted with cooling water.

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

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

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

  The water jacket spacer 21 is disposed in the upper region R1 of the water jacket 12. The water jacket spacer 22 is disposed in the middle region R2 of the water jacket 12. The water jacket spacer 23 is disposed in the lower region R <b> 3 of the water jacket 12.

  The plurality of water jacket spacers 21, 22, and 23 are disposed away from the bore wall portion 11. The plurality of water jacket spacers 21, 22, and 23 are provided so as to be extendable and contractable so that the distance from the bore wall portion 11 is variable. The plurality of water jacket spacers 21, 22, and 23 are made of a stretchable member such as rubber.

  The plurality of water jacket spacers 21, 22 and 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. It is preferable that the resin layer 50 is excellent in heat resistance and water resistance.

  The plurality of pressing members 31, 32, 33 are accommodated inside 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 will be described later.

  The movement amount adjustment unit 40 includes a plurality of actuators 41, 42, and 43. The plurality of actuators 41, 42, 43 have drive shafts 41a, 42a, 43a. The drive shafts 41 a, 42 a, 43 a pass through 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 with the movement of the drive shafts 41a, 42a, and 43a. The plurality of actuators 41, 42, and 43 adjust the movement amounts of the plurality of pressing members 31, 32, and 33 by adjusting the movement amounts of the drive shafts 41a, 42a, and 43a, respectively.

  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 motion of the motor to linear motion of the drive shafts 41a, 42a, 43a. . The plurality of actuators 41, 42, 43 may be configured by piezoelectric elements having different deformation amounts depending on the magnitude of the flowing current, or may be configured by a thermally deformable member such as a bimetal having different deformation amounts depending on the amount of heat applied. It may be.

  The plurality of actuators 41, 42, 43 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, respectively. For example, when the detected temperature is high, the plurality of actuators 41, 42, and 43 have a small amount of movement from the initial position, and when the detected temperature is low, the amount of movement from the initial position is large. The plurality of pressing members 31, 32, 33 are moved.

  The plurality of temperature detection parts 71, 72, 73 are provided inside the bore wall part 11. The plurality of temperature detection units 71, 72, and 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 detectors 71, 72, 73 are constituted by, for example, a thermocouple, a thermistor, or the like.

  The temperature detector 71 detects the temperature of the bore wall portion 11 at a portion corresponding to the upper region R1 of the water jacket 12. The temperature detector 72 detects the temperature of the bore wall 11 at a portion corresponding to the middle region R2 of the water jacket 12. The temperature detector 73 detects the temperature of the bore wall portion 11 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 and movement of water jacket spacer)
FIG. 3 is a cross-sectional view of the temperature control device for an internal combustion engine according to the first embodiment. With reference to FIG. 3, the detailed structure and movement of the water jacket spacer 21 according to the first embodiment will be described.

  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, 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 so as to connect one end side 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 walls 211, 212, the upper wall 213, and the lower wall 214 are joined to the resin layer 50. At least the side wall portions 211 and 212, the upper wall portion 213, and the lower wall portion 214 are provided to be stretchable, so that the water jacket spacer 21 has stretchability.

  The water jacket spacer 21 accommodates a plurality of pressing members 31 as moving bodies. The plurality of pressing members 31 are provided so as 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 arranged apart from each other. 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 portion 11, the water jacket spacer 21 contracts and moves away from the bore wall portion 11.

  The water jacket spacer 21 is not limited to the case where a plurality of pressing members 31 are accommodated, and a single pressing member may be accommodated. In this case, the pressing member extends along the main wall portion 215 so as to face the cylinder bore 3a from the cylinder bore 1a.

  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, the water jacket spacers 22 and 23 extend and approach the bore wall portion 11, and the plurality of pressing members 32 and 33 move in a direction away from the bore wall portion 11. As a result, it contracts 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 when the internal combustion engine is under a high load in the internal combustion engine temperature control apparatus according to the first embodiment. With reference to FIG. 4, the position of the water jacket spacer at the time of high load of the internal combustion engine will be described.

  When the internal combustion engine is under a high load, the number of fuel combustion increases between the engine head 5 and the cylinder block 10, so that the temperature on the upper side of the cylinder block 10 increases. For this reason, the temperature detected by the temperature detector 71 on the upper side of the cylinder block 10 is higher than the temperatures detected by the temperature detectors 72 and 73 on the middle and lower sides of the cylinder block 10.

  Based on such temperature information, when the internal combustion engine is at a high load, the movement amount adjustment unit 40 (the plurality of actuators 41, 42, 43) is a water jacket spacer disposed on the side closest to the engine head 5. The amount of movement 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.

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

  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 positions closer to the bore wall portion 11. The water jacket spacer 23 is moved shorter than the water jacket spacer 22 (so that the gap with the bore wall portion 11 is widened). 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, and 23 in this way, the flow rate of the cooling water flowing through the upper region R 1 of the water jacket 12 is greater than the flow rate of the cooling water flowing through the middle region R 2 and the lower region R 3 of the water jacket 12. Will also increase.

  Thereby, the bore wall part 11 of the part corresponding to upper area | region R1 can be cooled efficiently. As a result, it is possible to suppress the evaporation amount and consumption amount of oil filled in the cylinder bores 1a, 1b, 1c.

(Temperature distribution of bore wall at high load of internal combustion engine)
FIG. 5 is a diagram showing the temperature distribution of the bore wall in a direction parallel to the depth direction of the water jacket when the internal combustion engine is under a high load. With reference to FIG. 5, the temperature distribution of the bore wall portion 11 when the internal combustion engine is under a high load will be described.

  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 example and the comparative example, the distance from the bore wall 11 to the water jacket spacer 21 in the upper region R1 is maximized for the purpose of cooling the bore wall 11 in the portion corresponding to the upper region R1. ing. Comparing the example and the comparative example, the distance from the water jacket spacer to the bore wall 11 in the middle region R2 and the lower region R3 is different.

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

  On the other hand, the case where the conventional water jacket spacer which is not divided | segmented into the depth direction of a water jacket is used as a comparative example 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 of the embodiment to the water jacket spacer 21. Is moving.

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

  On the other hand, in the case of the comparative example, the flow rate flowing through 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. Thereby, the bore wall portion 11 corresponding to the upper region R1 cannot be efficiently cooled, and the cooling efficiency on the upper region R1 side is lowered. In addition, the bore wall portion 11 corresponding to the middle region R2 and the lower region R3 is excessively cooled, resulting in an increase in flow resistance when the piston 60 is moved.

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

  When the internal combustion engine is cold, the temperatures in the cylinder bores 1a, 1b, 1c are also low, and the flow resistance increases when the piston 60 is moved. 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 part area | region R2.

  Further, when the fuel burns between the engine head 5 and the cylinder block 10, the temperature on the upper side of the cylinder block 10 increases. In order to suppress the evaporation and consumption of oil from the upper side of the cylinder bores 1a, 1b, 1c, the temperature on the upper side of the cylinder block 10 is preferably lowered.

  When the temperature of the bore wall 11 is lowered by the temperature detectors 71, 72, 73 and it can be determined that the temperature is cold, the movement amount adjustment unit 40 (plural actuators 41, 42, 43). The water jacket spacer 21 and the bore wall portion 11 disposed on the side closest to the engine head 5 among all the distances between the plurality of water jacket spacers 21, 22, 23 and the bore wall portion 11 Between the plurality of pressing members 31, so that the distance between the water jacket spacer 22 and the bore wall portion 11 corresponding to the central region of the moving range of the piston 60 is the smallest. The amount of movement of 32 and 33 is adjusted.

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

  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 positions closer to the bore wall portion 11. The water jacket spacer 23 is moved shorter than the water jacket spacer 22 (so that the gap with the bore wall portion 11 is widened). 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 when the internal combustion engine is cold are moved closer to the bore wall 11 than the positions when the internal combustion engine is under high load (positions shown in FIG. 4).

  By moving the water jacket spacers 21, 22, and 23 in this way, the flow rate flowing through the middle region R <b> 2 can be suppressed, and the temperature of the bore wall portion 11 at the portion corresponding to the middle region R <b> 2 is efficiently increased. be able to.

  Further, since 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, the bore wall portion 11 corresponding to the upper region R1 can be efficiently formed. Can be cooled.

  Furthermore, the distance from the bore wall 11 to the water jacket spacer 23 in the lower region R3 is made slightly larger than the distance from the bore wall 11 to the water jacket spacer 22 in the middle region R2, thereby corresponding to the lower region R3. It can suppress that the temperature of the part bore wall part 11 rises 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 due to the oil can be reduced in the region where the speed of the piston 60 is increased.

(Temperature distribution of the bore wall when the internal combustion engine is cold)
FIG. 7 is a diagram showing the temperature distribution of the bore wall in a direction parallel to the depth direction of the water jacket when the internal combustion engine is cold. With reference to FIG. 7, the temperature distribution of the bore wall 11 when the internal combustion engine is cold will be described.

  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 both the example and the comparative example, the distance from the bore wall 11 to the water jacket spacer 22 is made the smallest in the middle region R2 in order to keep the temperature of the bore wall 11 corresponding to the middle region R2. ing. Comparing the example and the comparative example, the distance from the water jacket spacer to the bore wall 11 in the upper region R1 and the lower region R3 is different.

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

  On the other hand, the case where the conventional water jacket spacer which is not divided | segmented into the depth direction of a water jacket is used as a comparative example 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 of the embodiment to the water jacket spacer 22. Is moving.

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

  As a result, the temperature distribution of the bore wall 11 in the cold state is substantially constant in the temperature distribution of the bore wall 11 in the direction parallel to the depth direction of the water jacket 12.

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

  On the other hand, in the case of the comparative example, the flow rate flowing through 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. Thereby, the bore wall portion 11 corresponding to the upper region R1 cannot be efficiently cooled, and the cooling efficiency on the upper region R1 side is lowered. On the other hand, the temperature of the bore wall portion 11 at the portion corresponding to the middle region R2 is approximately the same as 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 corresponding to the middle region R2 can be set to a desired temperature. However, the upper region R1 side and the lower region R3 are compared with the embodiment. The side becomes hot. Thereby, the oil filled in the cylinder bores 1a, 1b, 1c is easily evaporated and consumed.

  As described above, in temperature control device 100 for an internal combustion engine according to Embodiment 1, adjacent to each other in water jacket 12 corresponding to a plurality of regions divided along the depth direction of water jacket 12. The water jacket spacers 21, 22, 23 that can be expanded and contracted are expanded and contracted by a plurality of pressing members 31, 32, 33, and move according to the state of the internal combustion engine such as during high load or cold By appropriately adjusting the amount of movement of the plurality of pressing members 31, 32, 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 set to a desired temperature distribution. be able to.

(Embodiment 2)
(Temperature adjusting device for internal combustion engine)
FIG. 8 is a vertical cross-sectional view of the internal combustion engine temperature control apparatus according to the second embodiment. With reference to FIG. 8, a temperature adjustment device 100A for an internal combustion engine according to the second embodiment will be described.

  The temperature adjustment device 100A for an internal combustion engine according to the second embodiment has a configuration of a plurality of moving bodies 31A, 32A, 33A and a movement amount adjustment unit when compared with the temperature adjustment device 100 for an internal combustion engine according to the first embodiment. Are different and are different in that the temperature detectors 71, 72, and 73 are not provided. Other configurations are almost the same.

  As shown in FIG. 8, in the temperature adjustment device 100A according to the second embodiment, the moving bodies 31A, 32A, and 33A are configured by piezoelectric elements that are extendable. The moving bodies 31A, 32A, and 33A expand and contract in the direction in which the bore wall portion 11 and the base portion 13 are arranged in accordance with the magnitude of the flowing current.

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

  The control unit 80 estimates the temperatures of the bore wall portions 11 corresponding to the plurality of regions divided along the depth direction of the water jacket 12, and determines the estimated temperatures of the bore wall portions 11 of the respective portions. Based on this, the currents flowing through the mobile bodies 31A, 32A, and 33A are adjusted.

  Based on the engine speed and the engine load, the control unit 80 estimates the temperatures of the bore wall portions 11 corresponding to the plurality of regions divided along the depth direction of the water jacket 12.

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

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

(Embodiment 3)
FIG. 9 is a longitudinal cross-sectional view of the temperature control device for an internal combustion engine according to the third embodiment. With reference to FIG. 9, a temperature adjustment device 100B for an internal combustion engine according to the third embodiment will be described.

  As shown in FIG. 9, the internal combustion engine temperature adjustment device 100B according to the third embodiment is parallel to the depth direction of the water jacket 12 when compared with the internal combustion engine temperature adjustment device 100A according to the second embodiment. The lengths of the water jacket spacers 21, 22, and 23 in different directions are different. 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. Yes.

  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. Yes.

  Even in the internal combustion engine temperature adjustment apparatus 100B configured as described above, control is performed in the same manner as in the internal combustion engine temperature adjustment apparatus 100 according to Embodiment 1 when the internal combustion engine is under a high load and when the internal combustion engine is cold. The unit 80 independently adjusts the moving amounts of the moving bodies 31A, 32A, and 33A.

  Thereby, even in the temperature adjustment device 100B of the internal combustion engine according to the third embodiment, an effect equal to or higher than that of the temperature adjustment device 100A of the internal combustion engine according to the second embodiment is obtained.

  In addition, by setting the length relationship of the water jacket spacers 21, 22, and 23 as described above, the flow rate flowing through the upper region R 1, the middle region R 2, and the lower region R 3 can be adjusted more appropriately.

  In the first to third embodiments described above, the case where the water jacket 12 is divided into the upper region R1, the middle region R2, and the lower region R3 along the depth direction has been described as an example. It is not limited to this, It may be divided into two and 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. However, the present invention is not limited to this, and the number of cylinder bores is one or more. Good.

  The internal combustion engine to which the present invention is applied includes a gasoline engine, a diesel engine, and the like. The present invention is applied to various types of engines such as a series type, a V type, a W type, and a horizontally opposed type. be able to.

  Although the embodiments of the present invention have been described above, the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

  1a, 1b, 1c Cylinder bore, 5 Engine head, 10 Cylinder block, 11 Bore wall part, 12 Water jacket, 13 Base part, 13a Wall surface, 21, 22, 23 Water jacket spacer, 31, 32, 33 Press member, 31A, 32A, 33A moving body, 40 movement amount adjustment unit, 41, 42, 43 actuator, 41a, 42a, 43a drive shaft, 50 resin layer, 60 piston, 71, 72, 73 temperature detection unit, 80 control unit, 100, 100A , 100B Temperature adjusting device, 211, 212 Side wall part, 213 Upper wall part, 214 Lower wall part, 215 Main wall part.

Claims (9)

A cylinder block in which a water jacket is formed around a bore wall portion constituting the cylinder bore;
Corresponding to a plurality of regions divided along the depth direction of the water jacket, the water jacket is disposed adjacent to each other in the water jacket, and is 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 temperature adjustment device for an internal combustion engine, comprising: a movement amount adjustment unit that independently adjusts the movement amounts of the plurality of moving bodies. The cylinder block includes a base that is disposed outside the water jacket and faces the bore wall,
A resin layer is provided on the wall surface of the base portion that defines the water jacket,
2. The temperature adjustment 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 moving body is accommodated therein. Each of the plurality of moving bodies is configured by a piezoelectric element provided to be extendable and contractible,
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 according to claim 1, wherein the control unit adjusts an expansion / contraction amount of the piezoelectric element by adjusting a current flowing through the piezoelectric element.   The controller estimates the temperature of the bore wall corresponding to each of a plurality of regions divided along the depth direction of the water jacket, and based on the estimated temperature of the bore wall, The temperature adjusting device for an internal combustion engine according to claim 3, wherein the current flowing through the element is adjusted. Each of the plurality of moving bodies includes a pressing member provided to be able to press the water jacket spacer,
The temperature adjustment device for an internal combustion engine according to claim 1, wherein the movement amount adjustment unit includes a plurality of actuators that move the pressing member. A plurality of temperature detection units that are provided inside the bore wall portion and detect the temperature of the bore wall portion respectively corresponding to a plurality of regions divided along the depth direction of the water jacket;
6. The temperature adjustment device for an internal combustion engine according to claim 5, wherein the plurality of actuators respectively adjust movement amounts of the plurality of moving bodies based on temperature information detected by the plurality of temperature detection units.   When the engine is under a heavy load, the movement amount adjusting unit has a distance between the water jacket spacer disposed on the side closest to the engine head and the bore wall portion so that the other water jacket and the bore wall are separated. The temperature adjustment device for an internal combustion engine according to any one of claims 1 to 6, wherein the movement amounts of the plurality of moving bodies are adjusted so as to be wider than a distance between the plurality of moving parts. The water jacket has an upper region, a middle region, and a lower region from the side close to the engine head along the depth direction,
The internal combustion engine temperature control device according to any one of claims 1 to 7, wherein the water jacket spacer is disposed in each of the upper region, the middle region, and the lower region.   In a direction parallel to the depth direction of the water jacket, the length of the water jacket spacer arranged in the upper region is shorter than the length of the water jacket spacer arranged in the middle region, and the middle region The temperature adjustment device for an internal combustion engine according to claim 8, wherein a length of the water jacket spacer arranged in the lower region is shorter than a length of the water jacket spacer arranged in the lower region.

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