JP2018039340A - Vehicle cooling device - Google Patents

Abstract

A vehicle cooling device capable of efficiently cooling a second heat exchanger according to a cooling state of a first heat exchanger. One and the other of the front upper region and the front lower region of the first heat exchanger 20 and the second heat exchanger 30 are more air-permeable than the easy-ventilation region 7 and the easy-ventilation region 7. Is a difficult-to-ventilate region 8 that hardly flows backward. In the second heat exchanger priority state in which the second heat exchanger 30 is located at the second height, the easy ventilation region 7 is more than in the first heat exchanger priority state in which the second heat exchanger 30 is located at the first height. The exposure range of the first front surface 20a of the first heat exchanger 20 is reduced, and the exposure range of the second front surface 30a of the second heat exchanger 30 is increased. The control means 42 is configured such that the second heat exchanger 30 is positioned at the first height when the temperature of the refrigerant detected by the temperature detection means 41 is equal to or higher than a predetermined temperature, and the second heat exchange when the temperature is lower than the predetermined temperature. The driving means 40 is controlled so that the device 30 is positioned at the second height. [Selection] Figure 5

Description

  The present invention relates to a vehicle cooling device.

  Patent Document 1 describes a support structure for a radiator in which a radiator 1 and an intercooler 9 are integrally connected by a mounting bracket 12 and mounted on a pair of left and right side rails 2. Further, the height in the vertical direction of the intercooler 9 is shorter than the height in the vertical direction of the radiator 1, and the intercooler 9 is disposed in front of the substantially center of the radiator 1 in the vertical direction, and the lower portion of the radiator 1 and the intercooler 9 A state in which the lower end portion is disposed below the upper surface of the side rail 2 is illustrated.

JP 2007-284016 A

  In general, in front of the radiator (first heat exchanger) and the intercooler (second heat exchanger), it is difficult to ensure a uniform passage of traveling wind over the entire range, and obstacles (frames, An area that is less susceptible to the influence of in-vehicle components (air-permeable area) and an area that is susceptible to obstacles and that is less likely to flow backward (an air-permeable area) naturally occur. Of the first heat exchanger and the second heat exchanger, the air cooling effect (cooling performance) is higher in the range included behind the easy ventilation region than in the range included behind the difficult ventilation region.

  Moreover, when the relative position of a 1st heat exchanger and a 2nd heat exchanger is being fixed like the structure of patent document 1, the range of the range exposed in an easy ventilation area | region among the front surfaces of a 1st heat exchanger is wide. This is determined by the fixed position of the second heat exchanger relative to the first heat exchanger. For this reason, when it is desired to preferentially cool the first heat exchanger, the second heat exchanger is arranged in the difficult-to-ventilation region so that a wide range of the front surface of the first heat exchanger is exposed in the easy-to-ventilated region. And fix it.

  However, depending on the traveling environment and traveling state of the vehicle, the temperature of the refrigerant flowing through the first heat exchanger is sufficiently lowered, and it is not necessary to preferentially cool the first heat exchanger, and the second heat exchange In some cases, it is preferable to cool the heat exchanger preferentially. In the structure of Patent Document 1, even in such a case, the second heat exchanger cannot be preferentially cooled.

  Then, an object of this invention is to provide the cooling device of the vehicle which can cool a 2nd heat exchanger efficiently according to the cooling state of a 1st heat exchanger.

  In order to achieve the above object, the present invention includes a first heat exchanger, a second heat exchanger, driving means, control means, and temperature detection means. The first heat exchanger has a first front surface that intersects the front-rear direction and is fixed to the vehicle body side. The second heat exchanger has a second front surface that intersects with the front-rear direction, and is capable of moving up and down between the first height and the second height in a state of overlapping the first front surface of the first heat exchanger from the front. Supported on the side. The drive means drives the second heat exchanger up and down. The control means controls the drive means to raise and lower the second heat exchanger. The temperature detection means detects the temperature of the refrigerant flowing through the first heat exchanger.

  One and the other of the front upper region and the front lower region of the first heat exchanger and the second heat exchanger are an easy-ventilation region in which air easily flows backward, and the air is less likely to flow backward than the easy-ventilation region. A ventilation region. In the second heat exchanger priority state in which the second heat exchanger is located at the second height, the first heat-releasing region is more first than the first heat exchanger priority state in which the second heat exchanger is located at the first height. The exposure range of the first front surface of the heat exchanger is reduced, and the exposure range of the second front surface of the second heat exchanger with respect to the easy ventilation region is increased. When the temperature of the refrigerant detected by the temperature detecting means is equal to or higher than the predetermined temperature, the control means is located at the first height and the temperature of the refrigerant detected by the temperature detecting means is lower than the predetermined temperature. The driving means is controlled so that the second heat exchanger is positioned at the second height.

  In the above configuration, when the temperature of the refrigerant flowing through the first heat exchanger is equal to or higher than the predetermined temperature, the second heat exchanger is set to the first height to be in the first heat exchanger priority state and Since the exposure range of the 1st front surface of 1 heat exchanger increases rather than the 2nd heat exchanger priority state, the 1st heat exchanger can be cooled preferentially. On the other hand, when the temperature of the refrigerant flowing through the first heat exchanger is lower than the predetermined temperature, the second heat exchanger is set to the second height to be in the second heat exchanger priority state, and the second heat to the easy ventilation region is set. Since the exposure range of the second front surface of the exchanger is increased more than the first heat exchanger priority state, the second heat exchanger can be preferentially cooled. Therefore, the second heat exchanger can be efficiently cooled according to the cooling state of the first heat exchanger.

  According to the present invention, the second heat exchanger can be efficiently cooled according to the cooling state of the first heat exchanger.

It is a side view of a vehicle provided with the cooling device of the vehicle concerning this embodiment. It is a principal part perspective view of the cooling device of the vehicle of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. It is a schematic diagram of the cooling device of the vehicle of FIG. It is a side view which shows the principal part of the cooling device of the vehicle which concerns on this invention, (a) is a figure which shows a 1st heat exchanger priority state, (b) is a 2nd heat exchanger priority state. It is a front view which shows the principal part of the cooling device of the vehicle which concerns on this invention, (a) is a 1st heat exchanger priority state, (b) is a figure which shows a 2nd heat exchanger priority state.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side, the arrow IN indicates the inner side of the vehicle width, the thick arrow in FIG. 3 indicates the flow of the traveling wind, and the thick arrow in FIG. Indicates the flow direction of the cooling water. In the following description, the front-rear direction means the front-rear direction of the vehicle, and the left-right direction means the left-right direction in a state where it faces the front of the vehicle.

  As shown in FIG. 1, a vehicle 1 including a vehicle cooling device 10 according to the present embodiment is a small cab-over type truck in which a cab 2 is generally disposed above an engine 3. 3 and the like, and a front bumper 5 extending in the vehicle width direction at the lower front end of the vehicle 1.

  As shown in FIG. 3, the cab 2 includes a front panel 11 that stands in a substantially vertical direction at the front end of the cab 2 and is disposed above the front bumper 5, and a floor panel 12 that defines a lower end surface of the cab 2. Have. The floor panel 12 includes a floor panel front portion 13 extending rearward from the front end of the cab 2, a floor panel inclined portion 14 extending obliquely rearward and upward from the rear end of the floor panel front portion 13, and the rear of the floor panel inclined portion 14. A floor panel rear portion 15 that bends substantially parallel to the floor panel front portion 13 from the end and extends to the rear end of the cab 2, and the engine 3 and the like below the floor panel inclined portion 14 and the floor panel rear portion 15. An engine room 6 that houses the engine cooling device 10 is defined. A radiator opening 16 that allows inflow of air (running wind) into the engine room 6 is formed in the vehicle width direction central portion of the lower end portion of the front panel 11. A radiator grill (not shown) having a plurality of ventilation holes is assembled to the radiator opening 16.

  2 and 3, the vehicle body frame 4 includes left and right side members 17 extending along the front-rear direction of the vehicle 1 on both sides in the vehicle width direction, and front ends of the left and right side members 17 extending in the vehicle width direction. The first cross member 18 that connects the parts, and the second cross member 19 that extends in the vehicle width direction behind the first cross member 18 and connects the left and right side members 17 to each other. At the front end of the vehicle 1, the upper and lower surfaces of the left and right side members 17, the upper and lower surfaces of the first cross member 18, and the upper and lower surfaces of the second cross member 19 are positioned at substantially the same height. A front bumper 5 is attached to the front surface of the first cross member 18. FIG. 3 shows only the right side member 17.

  The engine 3 is mounted between the left and right side members 17 below the floor panel rear portion 15 in the engine room 6 and fixed to the left and right side members 17 via an engine mount (not shown). The front end of the engine 3 is disposed behind the second cross member 19. An engine cooling device 10 to be described later is disposed in front of the engine 3 and is fixed to the left and right side members 17.

  As shown in FIGS. 2 to 6, the cooling device 10 includes a radiator (first heat exchanger) 20, an intercooler (second heat exchanger) 30, a radiator cooling fan 21, a radiator shroud 22, and a motor (driving means). ) 40, a temperature sensor (temperature detection means) 41, and a control unit (control means) 42 (hereinafter referred to as an ECU (Electric Control Unit), see FIG. 4). The engine cooling device 10 is disposed in a state where a gap is provided between the engine cooling device 10 and the second cross member 19. The intercooler 30 may be referred to as a charge air cooler.

  The radiator 20 is a plate-like structure including an upper tank 23, a lower tank 24, a radiator core 25, and left and right support frames 26, and has a front surface (first front surface) 20a and a rear surface 20b that intersect with the front-rear direction. The overall length of the radiator 20 in the vertical direction is set to be longer than the overall length of the intercooler 30 described later. The radiator 20 is disposed between the left and right side members 17 behind the second cross member 19 and below the front end portion of the floor panel rear portion 15, and in a posture inclined slightly rearward toward the top, Are attached to the left and right side members 17 via a radiator bracket 27 to which is fixed. With the radiator 20 attached to the left and right side members 17, the upper end of the radiator 20 is positioned above the upper surface of the vehicle body frame (side member 17 and second cross member 19) 4, and the lower end of the radiator 20 is The region above the lower half of the vehicle body frame 4 and the upper half or more region (upper region) of the radiator 20 is disposed above the upper surface of the second cross member 19. The radiator 20 allows passage of air (cooling air) flowing rearward above the second cross member 19 from the front surface 20a to the rear surface 20b. The radiator core 25 is sandwiched and fixed from both sides in the vehicle width direction by the left and right support frames 26 while being sandwiched between the upper tank 23 and the lower tank 24 from above and below. Cooling water for the engine 3 and the like is fed into the upper tank 23 from a radiator hose 29 connected to the upper tank 23. The cooling water (refrigerant) fed into the upper tank 23 passes through the plurality of thin tubes (not shown) of the radiator core 25 from the upper side to the lower side, and passes through the radiator core 25 from the front surface 20a of the radiator 20. Cooling is performed by exchanging heat with the cooling air passing through the rear surface 20b. The cooled cooling water flows into the lower tank 24 and is sent to the engine 3 and the like from a radiator hose 29 connected to the lower tank 24.

  The intercooler 30 is a plate-like structure having left and right intercooler tanks 31 extending vertically at both ends in the vehicle width direction and an intercooler core 32 sandwiched between the left and right intercooler tanks 31. A front surface (second front surface) 30a and a rear surface 30b. The intercooler 30 is smaller than the radiator 20, the vertical length of the intercooler 30 is shorter than the vertical length of the radiator 20, and the area of the front surface 30 a and the rear surface 30 b of the intercooler 30 is the front surface of the radiator 20. It is smaller than the area of 20a and the rear surface 20b. A pair of left and right support rails 44 extending in the vertical direction are fixed to the rear surfaces of the left and right intercooler tanks 31, and a pair of left and right guide rails extending in the vertical direction are provided at both ends of the front surface 20a of the radiator 20 in the vehicle width direction. Is fixed. The intercooler 30 is disposed between the second cross member 19 and the front surface 20a of the radiator 20 and below the front end portion of the floor panel inclined portion 14, and in a posture slightly inclined rearward toward the top, The pair of support rails 44 and the pair of left and right guide rails 43 are connected to the radiator 20 so as to be movable up and down by engaging with each other. The left and right guide rails 43 and the left and right support rails 44 engage with each other while allowing the intercooler 30 to move in the vertical direction and restricting movement in the front-rear direction and the vehicle width direction. A lower stopper (not shown) that restricts the movement of the intercooler 30 below the first height is provided at the lower ends of the left and right guide rails 43, and a second stopper is provided at the upper edge of the left and right guide rails 43. An upper stopper (not shown) that restricts the movement of the intercooler 30 above the height is provided. The first height is a height at which the lower end portion of the intercooler 30 is lowered to the lower end edge of the guide rail 43 of the radiator 20, and the second height is an upper portion of the first height, The upper end portion is a height that has risen to the upper end edge of the guide rail 43 of the radiator 20.

  A rack gear 46 that meshes with a pinion gear 45 that is fixed to the tip of an output shaft 48 of a motor 40 described later is formed on the vertical side edge of the rear surface of the intercooler tank 31 on the left side in the vehicle width direction. The intercooler 30 is held between the first height and the second height by meshing the rack gear 46 with the pinion gear 45 fixed to the tip of the output shaft 48 of the motor 40, and by controlling the rotation of the motor 40. The radiator 20 is supported so as to be movable up and down between the first height and the second height. In this way, the intercooler 30 is supported by the side member 17 via the radiator 20 so as to be able to move up and down between the first height and the second height within a range overlapping the front surface 20a of the radiator 20, and the second cross member. The passage of air (cooling air) flowing rearward above 19 is allowed to pass from the front surface 30a to the rear surface 30b. An inflow side air supply pipe 33 is connected to one of the left and right intercooler tanks 31, and high-temperature intake gas supercharged by a supercharger (not shown) of the engine 3 passes from the inflow side air supply pipe 33 to the intercooler. It flows into the tank 31. The intake gas flowing into one intercooler tank 31 passes through the plurality of thin tubes of the intercooler core 32 from one side to the other side, and passes through the intercooler core 32 from the front surface 30a of the intercooler 30. Cooling is performed by exchanging heat with the cooling air passing through the rear surface 30b. The cooled intake gas flows into the other intercooler tank 31 and is sent to the engine 3 from the outflow side supply pipe 33 connected to the other intercooler tank 31. The air supply pipe 33 connected to the intercooler tank 31 is formed in a bellows shape. In this embodiment, the left and right guide rails 43 fixed to the radiator 20 and the left and right support rails 44 fixed to the intercooler 30 are engaged with each other, whereby the intercooler 30 can be raised and lowered to the radiator 20. However, the present invention is not limited to this. For example, the left and right guide rails 43 are not fixed to the radiator 20 but are fixed to the left and right side members 17 via brackets. The intercooler 30 may be connected to the left and right side members 17 to be movable up and down by engaging the support rails 44 and the left and right guide rails 43 respectively. Further, the coupling mechanism between the intercooler 30 and the vehicle body (for example, the radiator 20 and the left and right side members 17) is limited to a structure in which the left and right guide rails 43 and the left and right support rails 44 are engaged with each other. Instead, another structure may be used as long as the intercooler 30 is configured to move up and down between the first height and the second height.

  As shown in FIGS. 5 and 6, the motor 40 is disposed above the side member 17 on the left side in the vehicle width direction, fixed to the upper surface of the radiator bracket 27 on the left side in the vehicle width direction via the motor bracket 47, and connected to the battery power source. (Not shown). The motor 40 is a stepping motor, and a pinion gear 45 having a gear on the outer peripheral surface is fixed to the tip of the output shaft 48 of the motor 40. The pinion gear 45 of the motor 40 meshes with a rack gear 46 formed on the side edge in the vertical direction of the rear surface of the intercooler tank 31 on the left side in the vehicle width direction. By controlling the rotation of the motor 40, the intercooler 30 moves up and down between the first height and the second height. That is, the motor 40 functions as an elevating unit that elevates and lowers the intercooler 30.

  As shown in FIGS. 3 and 5, in a region in front of the radiator 20 and the intercooler 30, a front upper region above the upper surfaces of the left and right side members 17 and a front portion below the upper surfaces of the left and right side members 17. Comparing with the lower region, the front upper region becomes the easy ventilation region 7 in which air easily flows backward, and the front lower region is on the side of the vehicle body such as the second cross member 19 on the front and in-vehicle parts (not shown). Due to the influence of the obstacle, the air becomes difficult to flow rearward than the easy ventilation region 7, so that it becomes a difficult ventilation region 8. In the radiator priority state in which the intercooler 30 is positioned at the first height, the upper end portion of the intercooler 30 and the substantially upper half of the radiator 20 are exposed to the easy ventilation region 7, and the front surface 20 a of the radiator 20 is the front surface of the intercooler 30. It is exposed to the easy ventilation region 7 in a range wider than 30a. On the other hand, in the intercooler priority state in which the intercooler 30 is positioned at the second height, the exposure range of the front surface 30a of the radiator 20 with respect to the easy ventilation region 7 is reduced and the intercooler 30 with respect to the easy ventilation region 7 is lower than in the radiator priority state. The intercooler 30 covers the front surface 20a of the radiator 20 in the easy ventilation region 7 in a state of overlapping from the front, and only the front surface 30a of the intercooler 30 is exposed to the easy ventilation region 7. In the present embodiment, the upper upper area of the radiator 20 and the intercooler 30 and above the upper surfaces of the left and right side members 17 is the easy ventilation area 7, which is above the upper surfaces of the left and right side members 17 and the radiator. 20 and the front lower region in front of the intercooler 30 is an example of the air-permeable region 8. For example, an obstacle on the vehicle body such as an in-vehicle component is located above the upper surfaces of the left and right side members 17. By being arranged, the lower front area of the radiator 20 and the front of the intercooler 30 below the lower surfaces of the left and right side members 17 is an easy ventilation area, and the radiator 20 above the lower surfaces of the left and right side members 17. When the front upper area in front of the intercooler 30 is a non-breathable area, the first height is set above the intercooler 30. Satoshi Ko part rises to the upper edge of the guide rail 43 of the radiator 20, the second height, the lower end of the intercooler 30 may be the height was lowered to the lower edge of the guide rail 43 of the radiator 20.

  As shown in FIG. 4, the temperature sensor 41 is provided in the upper tank 23 and out of the cooling water flowing through the radiator 20, the temperature at the radiator inlet 50 that returns from the engine 3 to the radiator 20 is used as the refrigerant temperature. The detected refrigerant temperature is transmitted to the ECU 42. The cooling water flowing through the radiator 20 includes the main upstream side pipe line 53 that connects the outlet side of the cooling path in the engine 3 and the radiator inlet 50, the outlet 51 of the radiator 20, and the engine in order to cool the engine 3. 3 is cooling water that circulates through a cooling pipe line 52 having a main downstream pipe line 54 that communicates with the inlet side of the cooling path in 3. Cooling water circulating through the cooling pipe 52 is circulated by the refrigerant water pump 55. Further, the cooling pipe line 52 may include a bypass flow path that bypasses the radiator 20 from the thermostat or the like provided in the cooling pipe line 52 and continues to the water pump 55. Further, the cooling water cooling pipe 52 may branch from the radiator hose 29, and the cooling water may flow from the cooling pipe 52 to another device (for example, an EGR cooler) other than the radiator 20.

  The ECU 42 drives and controls the motor 40 based on the refrigerant temperature detected by the temperature sensor 41. When the refrigerant temperature detected by the temperature sensor 41 (cooling water temperature of the radiator 20) becomes lower than a predetermined temperature, the ECU 42 controls the drive of the motor 40 to move the intercooler 30 to the second height and hold it. . On the other hand, when the temperature of the cooling water of the radiator 20 detected by the temperature sensor 41 becomes equal to or higher than a predetermined temperature, the ECU 42 controls the drive of the motor 40 to move the intercooler 30 to the first height and hold it.

  The intercooler 30 may control the motor 40 so as to move up and down stepwise between the first height and the second height. In this case, a relationship (height determination information) between the refrigerant temperature and the height of the intercooler 30 is set in advance in the ECU 42 so that the intercooler 30 is lowered as the refrigerant temperature is increased. The height corresponding to the refrigerant temperature detected by the temperature sensor 41 is determined according to the height determination information, and the motor 40 is driven and controlled so that the intercooler 30 moves up and down to the determined height.

  As shown in FIG. 3, the radiator cooling fan 21 is an axial fan disposed behind the radiator 20, and includes a hub 35 and a plurality of blades 36 extending radially from the outer periphery of the hub 35. , Coupled to the rotating shaft 37. The radiator cooling fan 21 is connected to the engine 3 via a pulley (not shown) on the rotating shaft side, a V belt (not shown), a pulley (not shown) on the engine 3 side, and the like, and is driven to rotate by the engine 3. . The radiator cooling fan 21 generates a flow of cooling air that passes from the front of the radiator 20 and the intercooler 30 to the rear of the radiator 20 when rotated. The engine 3 is disposed behind the radiator cooling fan 21. The radiator cooling fan 21 is not disposed behind the radiator 20 but is disposed in front of the radiator 20 so as to pass through the upper surface 20a of the radiator 20 and the rear surface 20b of the radiator 20 from the front surface 30a of the intercooler 30. Wind flow may be generated.

  The radiator shroud 22 is a cylindrical body having a substantially tapered inner peripheral surface that tapers from a substantially rectangular front end opening 38 toward a substantially circular rear end opening 39, and an outer peripheral edge of the front end portion of the radiator shroud 22. Is attached to the radiator 20 by being fixed to the peripheral edge of the rear surface of the radiator core 25. The radiator shroud 22 accommodates the radiator cooling fan 21 inside, and the inner peripheral surface of the rear end portion of the radiator shroud 22 is disposed in the vicinity of the blade 36 of the radiator cooling fan 21. The inner peripheral surface of the radiator shroud 22 guides the cooling air generated by the radiator cooling fan 21 and passed from the front of the intercooler 30 and the radiator 20 to the rear of the radiator 20 to the rear end opening 39. The cooling air guided to the rear end opening 39 is discharged from the rear end opening 39.

  Next, the flow of the traveling wind when the vehicle 1 is traveling and the flow of the cooling wind generated by the radiator cooling fan 21 will be described.

  As shown in FIG. 3, when the vehicle 1 travels, traveling wind flows into the engine room 6 from the radiator opening 16 at the lower end of the front panel 11.

  The traveling wind flowing into the engine room 6 from the radiator opening 16 is, in the radiator priority state located at the first height where the intercooler 30 is lowered, the dynamic pressure of the traveling wind flowing into the engine room 6 from the radiator opening 16 is It acts on the upper end portion of the front surface 30a of the intercooler 30 and the upper portion of the front surface 20a of the radiator 20 on the easy ventilation region 7 side, and acts on the lower side than the upper end portion of the front surface of the intercooler 30 on the difficult ventilation region 8 side. On the other hand, the traveling wind flowing into the engine room 6 from the radiator opening 16 is the movement of the traveling wind flowing into the engine room 6 from the radiator opening 16 in the intercooler priority state located at the second height where the intercooler 30 is raised. The pressure acts on the front surface 30a of the intercooler 30 on the easy ventilation region 7 side, and acts on the lower portion of the front surface 20a of the radiator 20 on the difficult ventilation region 8 side. In order to cool the high-temperature intake gas supercharged by the supercharger of the engine 3 or the cooling water of the engine 3 or the like, the radiator cooling fan 21 is rotationally driven by the engine 3 via the rotating shaft. When the radiator cooling fan 21 is driven to rotate, a negative pressure is generated in front of the radiator cooling fan 21, and the front side of the radiator cooling fan 21 becomes a negative pressure region. Thereby, on the intercooler 30 side, due to the pressure difference between the external air (running wind) on the front surface 30a side of the intercooler 30 and the negative pressure region on the rear surface 30b side of the intercooler 30, the front surface 30a of the intercooler 30 Air (cooling air) passes through the rear surface 30b, and the cooling air that has passed through the intercooler 30 flows toward the radiator cooling fan 21 side having a lower pressure toward the front surface 20a of the radiator 20, and from the front surface 20a of the radiator 20 to the rear surface Pass to 20b. Further, on the upper side of the radiator 20, due to the pressure difference between the external air on the front surface 20 a side on the upper side of the radiator 20 and the negative pressure area on the rear surface 20 b side on the upper side of the radiator 20, Air passes through.

  Next, the movement of the intercooler 30 will be described with reference to FIGS.

  The ECU 42 rotates the motor 40 in one direction when the temperature of the cooling water of the radiator 20 detected by the temperature sensor 41 becomes lower than a predetermined temperature. When the motor 40 rotates in one direction, the pinion gear 45 fixed to the tip of the output shaft 48 of the motor 40 also rotates in one direction. As a result, the rack gear 46 that meshes with the pinion gear 45 moves upward, and the intercooler 30 rises to the second height. On the other hand, when the temperature of the cooling water of the radiator 20 detected by the temperature sensor 41 becomes equal to or higher than a predetermined temperature, the ECU 42 rotates the motor 40 in the other direction. When the motor 40 rotates in the other direction, the pinion gear 45 fixed to the tip of the output shaft 48 of the motor 40 also rotates in the other direction. As a result, the rack gear 46 that meshes with the pinion gear 45 moves downward, and the intercooler 30 is lowered to the first height.

  In the vehicle cooling structure configured as described above, when the temperature of the cooling water flowing through the radiator 20 is equal to or higher than a predetermined temperature, the intercooler 30 is set to the first height to enter the radiator priority state and Since the exposure range of the front surface 20a of the radiator 20 is increased as compared with the intercooler priority state, the radiator 20 can be preferentially cooled. On the other hand, when the temperature of the cooling water flowing through the radiator 20 is lower than the predetermined temperature, the intercooler 30 is set to the second height and the intercooler is in the priority state, and the exposure range of the front surface 30a of the intercooler 30 with respect to the easy ventilation region is Since it increases more than the radiator 20 priority state, the intercooler 30 can be cooled preferentially. Therefore, the intercooler 30 can be efficiently cooled according to the cooling state of the radiator 20.

  In the present embodiment, the motor 40 is applied to the driving unit, and the intercooler 30 is raised and lowered by the motor 40. However, the present invention is not limited to this. For example, the intercooler 30 may be raised and lowered by an actuator or the like. Good.

  Further, the detected refrigerant temperature is the temperature at the radiator inlet 50 of the cooling water flowing through the radiator 20 and returning from the engine 3 to the radiator 20, but is not limited to this, and is not limited to this. It may be the temperature of the refrigerant other than (for example, the temperature at the radiator outlet 51 of the cooling water supplied from the radiator 20 to the engine 3).

  In addition, an air conditioner condenser, an oil cooler, or the like may be disposed in front of the intercooler 30 so as to allow air flow from the front surface to the rear surface.

  In the present embodiment, the height at which the lower end portion of the intercooler 30 descends to the lower end edge of the guide rail 43 of the radiator 20 is defined as a first height, and the upper end portion of the intercooler 30 is the upper end edge of the guide rail 43 of the radiator 20. However, the exposure range of the front surface 20a of the radiator 20 with respect to the easy ventilation region 7 is reduced in the intercooler priority state and the intercooler with respect to the easy ventilation region 7 in the intercooler priority state. The first height and the second height may be set to other heights as long as the requirement that the exposure range of the front surface 30a of the 30 increases.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said embodiment, Of course, it can change suitably in the range which does not deviate from this invention. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

  For example, in the present embodiment, the aspect in which the vehicle cooling device is mounted on the vehicle 1 which is a small cab-over type truck has been described. However, the present invention is not limited to this, and various vehicles such as a large truck can be used. A cooling device may be mounted.

  The radiator cooling fan 21 is not limited to an engine fan coupled to the engine 3, and may be, for example, an electric fan connected to a motor and driven to rotate by electricity.

  Further, the first heat exchanger and the second heat exchanger are not limited to the radiator 20 and the intercooler 30, respectively, and may be a condenser for an air conditioner, an oil cooler, or the like.

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Engine 6 Engine room 7 Easy ventilation area 8 Difficult ventilation area 10 Cooling device 16 Radiator opening 17 Side member 19 2nd cross member 20 Radiator (1st heat exchanger)
20a Front 20b Rear 21 Radiator cooling fan 30 Intercooler (second heat exchanger)
30a Front surface 30b Rear surface 40 Motor (driving means)
41 Temperature sensor (temperature detection means)
42 Control unit (control means)
43 Guide rail 44 Support rail 45 Pinion gear 46 Rack gear

Claims (1)

A first heat exchanger having a first front surface intersecting with the front-rear direction and fixed to the vehicle body side;
It has a second front surface that intersects with the front-rear direction, and is supported on the vehicle body side so as to be able to move up and down between a first height and a second height while overlapping the first front surface of the first heat exchanger from the front. A second heat exchanger;
Drive means for driving the second heat exchanger up and down;
Control means for controlling the driving means to raise and lower the second heat exchanger;
Temperature detecting means for detecting the temperature of the refrigerant flowing through the first heat exchanger,
One and the other of the front upper region and the front lower region of the first heat exchanger and the second heat exchanger are such that air easily flows rearward and air hardly flows rearward than the easy airflow region. With a breathable area,
In the second heat exchanger priority state where the second heat exchanger is located at the second height, the second heat exchanger is easier than the first heat exchanger priority state where the second heat exchanger is located at the first height. An exposure range of the first front surface of the first heat exchanger with respect to a ventilation region decreases, and an exposure range of the second front surface of the second heat exchanger with respect to the easy ventilation region increases;
When the temperature of the refrigerant detected by the temperature detection means is equal to or higher than a predetermined temperature, the control means is configured such that the second heat exchanger is positioned at the first height and the temperature of the refrigerant detected by the temperature detection means is When the temperature is lower than the predetermined temperature, the drive unit is controlled so that the second heat exchanger is positioned at the second height.

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