JP2006144675A - Temperature regulating device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature regulating device for an internal combustion engine widely controlling heat quantity collected to cooling water with a simple structure. <P>SOLUTION: This temperature regulating device for the engine is provided with a cylinder block 12 having a water jacket 21 formed around a bore wall 110, a water jacket spacer 25 arranged in the water jacket 21 and forming a variable space 28 at a position in the water jacket 21 adjoining the bore wall 110, and actuators 31, 32 moving the water jacket spacer 25 to vary volume of the variable space 28 with keeping volume of the water jacket 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

  With respect to a conventional temperature control device for an internal combustion engine, for example, Japanese Patent Laid-Open No. 5-195860 discloses a water jacket capacity variable device for quickly increasing the water temperature of the water jacket and improving the heating effect. (Patent Document 1). In the capacity variable device disclosed in Patent Document 1, a water partition in a cylinder block is provided with a movable partition wall for changing the cooling water capacity.

Japanese Patent Laid-Open No. 4-325711 discloses a cooling device for an internal combustion engine for the purpose of improving the cooling performance of the cylinder (Patent Document 2). The cooling device disclosed in Patent Document 2 includes a partition wall provided in a water jacket around a cylinder and connected to an extendable bellows. The cooling water is discharged from the water jacket by expanding and contracting the bellows and moving the partition wall in the cylinder axial direction.
Japanese Patent Laid-Open No. 5-195860 JP-A-4-325711

  The heat generated in the engine is collected in cooling water circulated in the water jacket and used for heating using a heater. However, in recent years, as the combustion efficiency of the engine has improved, it has become difficult to sufficiently raise the temperature of the cooling water. For this reason, there is a concern that the heater does not readily warm immediately after the engine is started or that sufficient heater performance cannot be ensured in a cold region. In order to solve such a problem, a means for providing an auxiliary electric heater may be considered. However, in this case, the fuel consumption is deteriorated and the manufacturing cost is increased.

  On the other hand, in Patent Document 1 described above, the water temperature is quickly increased by moving the movable partition wall and reducing the cooling water capacity in the water jacket. However, in this case, since the cooling water capacity is increased or decreased, it is necessary to provide a reserve tank on the path for circulating the cooling water. In Patent Document 1, the increase or decrease in the cooling water is compensated by the reserve tank for the radiator, but it is difficult to absorb all the increase or decrease in the cooling water generated in the water jacket with the capacity of the reserve tank for the radiator. When a reserve tank is newly provided, the number of parts of the engine cooling system increases, resulting in an increase in manufacturing cost. Further, the same problem occurs in the cooling device disclosed in Patent Document 2 in which cooling water is discharged from the water jacket by the movement of the partition walls.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problem, and to provide a temperature control device for an internal combustion engine that can control the amount of heat recovered in cooling water with a simple configuration.

  An internal combustion engine temperature control device according to the present invention includes a cylinder block in which a water jacket is formed around a bore wall, and a variable space formed in a position in the water jacket adjacent to the bore wall. And an actuator that moves the water jacket spacer so that the volume of the variable space changes while maintaining the volume of the water jacket.

  According to the temperature control device for an internal combustion engine configured as described above, by providing the water jacket spacer in the water jacket, the cross-sectional area of the water jacket is reduced by the amount of the water jacket spacer. For this reason, the flow velocity of the cooling water flowing through the water jacket can be increased. Further, by moving the water jacket spacer by the actuator and increasing the volume of the variable space, more cooling water can be guided to a position adjacent to the bore wall. Thereby, the amount of heat recovered from the periphery of the bore wall into the cooling water can be greatly increased. On the other hand, when the water jacket spacer is moved in the direction in which the volume of the variable space is reduced, the flow of the cooling water is prevented at a position adjacent to the bore wall. Therefore, in this case, the amount of heat recovered from the periphery of the bore wall into the cooling water can be reduced.

  The actuator moves the water jacket spacer while maintaining the volume of the water jacket. For this reason, the amount of cooling water flowing through the water jacket does not change due to the movement of the water jacket spacer, and there is no need to provide a reserve tank for storing the cooling water. Therefore, according to the present invention, it is possible to widely control the amount of heat recovered from the internal combustion engine to the cooling water with a simple configuration.

  The cylinder block has a side wall facing the water jacket spacer across the variable space. Preferably, the actuator moves the water jacket spacer so that the distance from the water jacket spacer to the side wall changes. According to the temperature control device for an internal combustion engine configured as described above, the amount of cooling water flowing to a position adjacent to the bore wall can be effectively increased or decreased when the water jacket spacer moves. Thereby, the amount of heat recovered in the cooling water can be controlled in a wider range.

  Preferably, the actuator moves the water jacket spacer so that the water jacket spacer and the side wall are not in contact with each other. According to the temperature control device for an internal combustion engine configured as described above, even when the water jacket spacer is positioned at a position where the volume of the variable space becomes small, the cooling water is allowed to flow to a position adjacent to the bore wall. Therefore, a variable space can be secured. Thereby, the excessive temperature rise of a bore wall can be prevented.

  Preferably, when the waste heat is positively recovered from the cooling water flowing in the water jacket, the actuator moves the water jacket spacer in a direction in which the volume of the variable space is increased. According to the temperature control device for an internal combustion engine configured as described above, the waste heat recovery performed through the cooling water can be actively performed by increasing the amount of heat recovered in the cooling water.

  In addition, preferably, when the waste heat recovery is positively performed, it includes during the warm-up of the internal combustion engine. The term “while warming up” refers to the time until the cooling water rises to a predetermined temperature at a constant transition. According to the temperature control apparatus for an internal combustion engine configured as described above, the heating performance of the heater that exchanges heat with the cooling water can be secured at an early stage.

  Preferably, when the waste heat recovery is positively performed, the time when the heating requirement is high is included. According to the temperature adjustment device for an internal combustion engine configured as described above, the heating performance of the heater can be sufficiently improved when the heating requirement is high, such as when the engine is in a cold region.

  Preferably, the actuator moves the water jacket spacer in a direction in which the volume of the variable space decreases when the internal combustion engine is warmed up and there is no heating requirement. According to the temperature control device for an internal combustion engine configured as described above, the temperature of the bore wall can be increased by reducing the amount of heat recovered in the cooling water. Thereby, the viscosity of the lubricating oil adhering to the bore wall can be reduced, and the sliding resistance between the bore wall and the piston can be reduced.

  As described above, according to the present invention, it is possible to provide a temperature adjusting device for an internal combustion engine capable of widely controlling the amount of heat recovered in the cooling water with a simple configuration.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a cooling system of an engine equipped with a temperature adjusting device according to an embodiment of the present invention. Referring to FIG. 1, a vehicle engine 10 is a V-type multi-cylinder engine having a left bank and a right bank arranged in a V shape. In the present embodiment, the structure of the temperature adjustment device mounted on the left bank will be described. However, the temperature adjustment device having the same structure is also mounted on the right bank.

  The engine 10 includes a cylinder block 12 and a cylinder head 11 assembled to the cylinder block 12. In the cylinder block 12, a cylinder (# 2) 102, a cylinder (# 4) 104, and a cylinder (# 6) 106 into which pistons are fitted are formed side by side. A combustion chamber is formed at a position surrounded by these cylinders and the cylinder head 11, and an intake port and an exhaust port communicating with the combustion chamber are formed in the cylinder head 11. The engine 10 is formed with a water jacket through which cooling water is forcedly circulated.

  The water jacket is formed so as to pass around the cylinder formed in the cylinder block 12 and further pass through the vicinity of the intake port and the exhaust port formed in the cylinder head 11. The water jacket is connected to the radiator 13 via a hose. Cooling water is supplied from the radiator 13 to the water jacket, and the cooling water cools the engine 10. A part of the cooling water is led from the engine 10 to the heater 14, and the heat recovered from the engine 10 is used for heating the inside of the vehicle.

  FIG. 2 is a plan view showing an engine temperature adjusting device in the present embodiment. In the figure, a cylinder block viewed from the line II-II in FIG. 1 is shown. FIG. 3 is a cross-sectional view of the temperature adjusting device taken along line III-III in FIG.

  Referring to FIGS. 2 and 3, cylinder block 12 is located around cylinder bore portion 22 provided with cylinder liner 24, water jacket 21 formed so as to surround cylinder bore portion 22, and water jacket 21. The cylinder block base portion 23 is formed integrally with the cylinder bore portion 22. The cylinder liner 24 has a bore wall 110 extending in a cylindrical shape, and cylinders 102, 104, and 106 are formed at positions surrounded by the bore wall 110. In the present embodiment, the cylinder block 12 is made of an aluminum alloy, and the cylinder liner 24 is made of an iron alloy.

  The water jacket 21 has a concave shape that opens to the top surface 12a side of the cylinder block 12 and reaches the predetermined depth from the top surface 12a. The cylinder head 11 is attached to the top surface 12a via a gasket. The water jacket 21 extends along the periphery of the cylinder bore portion 22 so as to surround the cylinders 102, 104, and 106 when viewed from the top surface 12a side. The water jacket 21 is formed between an inner wall 12p extending on the back side of the bore wall 110 with the cylinder bore portion 22 interposed therebetween, and an outer wall 12q facing the inner wall 12p with a predetermined interval.

  A water jacket spacer 25 is accommodated in the water jacket 21. The water jacket spacer 25 is formed with a length smaller than the depth of the water jacket 21, and the bottom of the water jacket 21 that is relatively far from the top surface 12a than the top of the water jacket 21 that is relatively close to the top surface 12a. It is provided at a position close to The water jacket spacer 25 is formed to extend in the same manner as the water jacket 21 when viewed from the top surface 12a side.

  The water jacket spacer 25 is located on the intake side 12i (the side where the intake port is formed on the cylinder head 11) and on the exhaust side 12e (the side where the exhaust port is formed on the cylinder head 11). It is composed of a water jacket spacer 25m. The water jacket spacers 25n and 25m are provided so that a gap 27 is formed at a position where the respective end portions face each other. The gap 27 is provided so that the water jacket spacer 25n and the water jacket spacer 25m do not interfere with each other when the water jacket spacer 25 described later moves. In the present embodiment, the water jacket spacer 25 is formed over the entire circumference of the cylinder bore portion 22 except for the gap 27, but is formed only in a part of the periphery of the cylinder bore portion 22. Alternatively, it may be formed at predetermined intervals along the periphery of the cylinder bore portion 22.

  The water jacket spacer 25 is formed with a width smaller than the distance between the inner wall 12p and the outer wall 12q, that is, the width of the water jacket 21. The width of the water jacket 21 is, for example, 10 mm, and the width of the water jacket spacer 25 is, for example, 5 mm. The water jacket spacer 25 is positioned at a position spaced from both the inner wall 12p and the outer wall 12q.

  As a material of the water jacket spacer 25, for example, a lightweight resin having a strength necessary for assembly can be selected. In this case, the method for manufacturing the water jacket spacer 25 is preferably mold injection molding from the viewpoint of the degree of freedom in shape and mass productivity. Examples of such a resin include glass-reinforced aromatic nylon in consideration of the use environment (high temperature resistance, coolant resistance, water resistance, wear resistance) in the block. The material of the water jacket spacer 25 is not limited to resin, and aluminum, cast iron, other non-metallic materials or inorganic materials can be selected.

  On the outside of the cylinder block 12, a plurality of actuators 31 and 32 having drive shafts 31s are disposed on the intake side 12i and the exhaust side 12e, respectively. The drive shaft 31 s extends from the actuators 31 and 32 to the water jacket 21 through the cylinder block base portion 23. In the water jacket 21, the drive shaft 31s of the actuator 31 is connected to the water jacket spacer 25n, and the drive shaft 31s of the actuator 32 is connected to the water jacket spacer 25m. Although not shown, a seal ring is provided on the outer peripheral surface of the drive shaft 31 s so as to be located in a portion penetrating the cylinder block base portion 23. This seal ring prevents cooling water from leaking from the water jacket 21.

  When the actuators 31 and 32 are driven, the drive shaft 31s moves in the direction indicated by the arrow 201 that is the axial direction thereof. As a result, the water jacket spacers 25 n and 25 m move within the water jacket 21. The actuators 31 and 32 may be hydraulic cylinders, or may be a combination of a motor and a mechanism that converts the rotational motion of the motor into linear motion of the drive shaft 31s. The actuators 31 and 32 may be configured to be built in the cylinder block 12.

  FIG. 4 is a cross-sectional view of the temperature adjusting device showing a state where the water jacket spacer is positioned on the outer wall side of the water jacket. On the other hand, FIG. 3 shows the temperature adjusting device in a state where the water jacket spacer 25 is positioned on the inner wall 12p side of the water jacket 21.

  3 and 4, the water jacket spacer 25 has a surface 25a facing the inner wall 12p. A variable space 28 is formed between the inner wall 12p and the surface 25a. The variable space 28 is formed along the cylinder bore portion 22 at a position adjacent to the bore wall 110. A plurality of piston rings 42 are attached to the piston 41 fitted in the cylinder 104. The piston 41 reciprocates in the cylinder 104 while bringing the piston ring 42 into contact with the oil film adhering to the bore wall 110.

  The actuators 31 and 32 move the water jacket spacer 25 so that the distance between the surface 25a and the inner wall 12p changes. The water jacket spacer 25 moves in a direction in which the bore wall 110 extends in a cylindrical shape, that is, in a direction orthogonal to the direction in which the piston 41 reciprocates. The water jacket spacer 25 moves between the inner wall 12p and the outer wall 12q. When the water jacket spacer 25 is moved so that the distance between the surface 25a and the inner wall 12p is reduced and positioned at a position closer to the inner wall 12p in the water jacket 21, the volume of the variable space 28 is reduced. On the other hand, when the water jacket spacer 25 is moved so that the distance between the surface 25a and the inner wall 12p is increased and positioned at a position closer to the outer wall 12q in the water jacket 21, the volume of the variable space 28 is increased. Becomes larger. When the water jacket spacer 25 moves, the volume of the water jacket 21 is kept constant.

  FIG. 5 is a schematic diagram showing the flow of cooling water circulating in the water jacket in FIG. In the drawing, the water jacket spacer 25 in FIG. 2 is omitted. Referring to FIGS. 2 and 5, the cylinder block base portion 23 is formed with a cooling water supply hole 51 that is located on the exhaust side 12 e near the front side 12 f and communicates with the water jacket 21. The gasket disposed between the cylinder block 12 and the cylinder head 11 has a gasket hole 52 that is located on the front side 12f and communicates between the water jacket 21 and the water jacket formed on the cylinder head 11. Is formed.

  A part of the cooling water supplied from the cooling water supply hole 51 to the water jacket 21 flows directly to the gasket hole 52 through the front side 12f. The remaining portion first flows through the exhaust side 12e and travels toward the rear side 12r. Furthermore, it makes a U-turn at the rear side 12r, flows through the intake side 12i, and moves toward the gasket hole 52 on the front side 12f. During this time, the cooling water absorbs heat from the cylinder bore portion 22 whose temperature has increased due to the explosion of the combustion gas in the combustion chamber, and cools the cylinder block 12. At this time, the cross-sectional area of the flow path through which the cooling water flows is reduced by the water jacket spacer 25 arranged in the water jacket 21. For this reason, compared with the case where the water jacket spacer 25 is not provided, the flow rate of the cooling water is increased, and as a result, the amount of heat absorbed from the cylinder block 12 can be increased. The flow of the cooling water varies depending on the position where the cooling water supply hole 51 and the gasket hole 52 are provided, and is not limited to the above-described flow.

  Next, the relationship between the movement of the water jacket spacer 25 and the amount of heat recovered from the cylinder bore portion 22 into the cooling water will be described.

  Referring to FIG. 3, when the water jacket spacer 25 is moved to the position closer to the inner wall 12p by the actuator 32, the volume of the variable space 28 is reduced, so that the cooling water flows between the cylinder block base 23 and the water jacket. Guided to the space between the spacers 25. For this reason, the amount of cooling water flowing to a position adjacent to the bore wall 110 is reduced, and the amount of heat recovered from the cylinder bore portion 22 into the cooling water is suppressed. Referring to FIG. 4, on the other hand, when the water jacket spacer 25 is moved to the position closer to the outer wall 12q, the volume of the variable space 28 increases, so that more cooling water is adjacent to the bore wall 110. Flowing into. For this reason, the amount of heat recovered from the cylinder bore 22 into the cooling water increases.

  FIG. 6 is a diagram illustrating timing for moving the water jacket spacer. Referring to FIG. 6, first, during warming up of engine 10, water jacket spacer 25 is moved to a position closer to outer wall 12q. Thereby, the temperature of the cooling water sent to the heater 14 can be raised in a short time, and heating performance can be improved at an early stage.

  Next, when the thermostat is activated and cooling water is supplied to the radiator, the water jacket spacer 25 is moved to a position close to the inner wall 12p side. At this time, the amount of heat recovered in the cooling water decreases, and the temperature of the cylinder bore portion 22 increases. Thereby, the temperature of the oil film adhering to the bore wall 110 becomes high, and the sliding resistance of the piston 41 can be reduced. At this time, it is preferable that a gap is secured between the surface 25a and the inner wall 12p so that the volume of the variable space 28 does not become zero. In this case, an excessive temperature rise in the cylinder bore portion 22 can be prevented.

  In the present embodiment, the water jacket spacer 25 is provided at a position near the bottom of the water jacket 21. For this reason, when the water jacket spacer 25 is moved to a position close to the inner wall 12p side, the cooling effect is maintained high on the top dead center side of the piston 41 that is close to the combustion chamber and has a relatively high temperature, It is possible to prevent an excessive temperature rise from occurring at that position. Further, the cooling effect can be suppressed by the action of the water jacket spacer 25 on the bottom dead center side of the piston 41 which is located away from the combustion chamber and has a relatively low temperature. Thereby, the temperature distribution of the bore wall 110 can be made uniform, and the fuel consumption can be improved by reducing the sliding resistance of the piston 41.

  Further, when the vehicle on which the engine 10 is mounted is traveling in a cold region, the water jacket spacer 25 may be moved to a position closer to the outer wall 12q to ensure heating performance. In this case, for example, the temperature of the warm air is measured by a temperature sensor arranged immediately after the heater. The measured temperature is input to an air conditioner computer, and the temperature is compared with the temperature set for the air conditioner to determine whether the heating performance is sufficient. When it is determined that the heating performance is insufficient, the water jacket spacer 25 is moved to a position close to the outer wall 12q side. In addition, the timing which moves the water jacket spacer 25 demonstrated above is an example, and can be moved at a suitable timing according to the situation at that time.

  The temperature control device for an engine 10 as an internal combustion engine according to an embodiment of the present invention includes a cylinder block 12 in which a water jacket 21 is formed around a bore wall 110, and is disposed in the water jacket 21 and is adjacent to the bore wall 110. A water jacket spacer 25 that forms the variable space 28 at a position within the matching water jacket 21, and an actuator 31 that moves the water jacket spacer 25 so that the volume of the variable space 28 changes while maintaining the volume of the water jacket 21. And 32.

  According to the temperature adjustment device for the engine 10 according to the embodiment of the present invention configured as described above, the water jacket spacer 25 is moved in a predetermined direction to recover from the engine 10 to the cooling water in the water jacket 21. The amount of heat to be increased can be increased, and the heating effect by the heater 14 can be sufficiently improved. Further, since the volume of the water jacket 21 does not change when the water jacket spacer 25 is moved, it is not necessary to separately provide a reserve tank for storing the cooling water pushed out from the water jacket 21. Further, since the capacity of the cooling water in the water jacket 21 does not increase and the pressure of the cooling water does not drop at that time, there is no possibility that the cooling water will easily boil or cavitation will occur in the water pump. For this reason, it is possible to improve the heating performance while maintaining the cooling system of the engine 10 at a low cost and a highly reliable structure.

  The engine to which the present invention is applied includes a gasoline engine and a diesel engine. There are various types of engines such as a series type, a W type, and a horizontally opposed type in addition to a V type.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view which shows the cooling system of the engine by which the temperature control apparatus in embodiment of this invention is mounted. It is a top view which shows the temperature control apparatus of the engine in this Embodiment. It is sectional drawing of the temperature control apparatus along the III-III line | wire in FIG. It is sectional drawing of the temperature control apparatus which shows the state by which the water jacket spacer was positioned by the outer wall side of the water jacket. It is a schematic diagram which shows the flow of the cooling water which circulates in the water jacket in FIG. It is a figure which shows the timing which moves a water jacket spacer.

Explanation of symbols

  10 engine, 12 cylinder block, 12p inner wall, 21 water jacket, 25 water jacket spacer, 28 variable space, 31, 32 actuator, 110 bore wall.

Claims (7)

A cylinder block with a water jacket formed around the bore wall;
A water jacket spacer disposed in the water jacket and forming a variable space at a position in the water jacket adjacent to the bore wall;
An internal combustion engine temperature control device comprising: an actuator that moves the water jacket spacer so that the volume of the variable space changes while maintaining the volume of the water jacket. The cylinder block has a side wall facing the water jacket spacer across the variable space,
2. The temperature adjustment device for an internal combustion engine according to claim 1, wherein the actuator moves the water jacket spacer so that a distance from the water jacket spacer to the side wall changes.   The temperature adjusting device for an internal combustion engine according to claim 2, wherein the actuator moves the water jacket spacer so that the state in which the water jacket spacer and the side wall are not in contact with each other is maintained.   4. The actuator according to claim 1, wherein the actuator moves the water jacket spacer in a direction in which the volume of the variable space is increased when actively recovering waste heat from the cooling water flowing in the water jacket. The temperature control device for an internal combustion engine according to claim 1.   The internal combustion engine temperature adjustment device according to claim 4, wherein the waste heat recovery is positively performed during the warm-up of the internal combustion engine.   The internal combustion engine temperature adjustment device according to claim 4 or 5, wherein when the waste heat recovery is positively performed includes a time when a heating requirement is high.   7. The actuator according to claim 1, wherein the actuator moves the water jacket spacer in a direction in which the volume of the variable space decreases when the internal combustion engine is warmed up and there is no heating requirement. The temperature adjusting device for an internal combustion engine according to the item.

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