JP4379137B2 - Cooling device for vehicle engine - Google Patents

Description

  The present invention relates to a cooling device for a vehicle engine.

  As a cooling device including a radiator and a passenger compartment air conditioning heater, a water pump is provided at the inlet of a water jacket formed in the engine body, a water outlet member is attached to the outlet, and the water outlet member and the water pump suction Devices that circulate cooling water in each of a radiator path and a heater path that connect the mouth are known. Such a cooling device further includes a bottom bypass path for bypassing the radiator and a thermostat valve provided at the suction port of the water pump. When the engine is cold, the thermostat valve opens the bottom bypass path side. And the radiator path is closed and the cooling water is circulated through the bottom bypass path, while the engine is warm, the thermostat valve closes the bottom bypass path side and opens the radiator path. Cooling water is circulated by a radiator path.

  In recent years, for the purpose of improving fuel efficiency, a cooling device equipped with a warmer cooler (heat exchanger) of automatic transmission oil (hereinafter also referred to as ATF) has been known (for example, see Patent Documents 1 and 2).

Specifically, Patent Document 1 discloses a cooling device in which a heater and an ATF heat exchanger are arranged in series in a heater path in which a heater for passenger compartment air conditioning is interposed. Further, in the above-mentioned Patent Document 2, a bypass path that bypasses the heater of the heater path is further provided, and an ATF heat exchanger is provided therein, whereby the heater and the ATF heat exchanger are arranged in parallel. A cooling device is disclosed.
JP 2002-47935 A JP 2002-323117 A

  However, both the heater and the heat exchanger have a large flow path resistance, and the flow rate of the cooling water in the heater is reduced in the series configuration of the heater and the heat exchanger disclosed in Patent Document 1, thereby the heater performance. Has the disadvantage of lowering.

  On the other hand, in the parallel configuration of the heater and heat exchanger disclosed in Patent Document 2, since the heater path is branched in the middle, the flow rate of the cooling water flowing through the heater is reduced by the amount flowing toward the heat exchanger. The diameter of the heater outlet port of the water outlet member to which the heater pipe and the heater return pipe forming the heater path are connected and the diameter of the heater inlet port of the thermostat housing are larger than the diameter of the outlet / inlet port for the radiator path. Since the flow rate of the cooling water flowing through the heater path is small, the heater performance cannot be improved even with this parallel structure.

  Further, in order for the heat exchanger to function as an oil warmer / cooler, the cooling water must be flowed both when the engine is cold and when it is warm. In order to ensure the warmer / cooler function of the heat exchanger and the heater performance, for example, the outlet port configuration of the water outlet member can be changed, or the on-off valve and switching that are electrically controlled as necessary It is also possible to use a valve or the like. In this case, however, the engine design is changed and the cost is increased.

  The present invention has been made in view of the above points, and an object of the present invention is to reduce costs in a vehicular engine cooling device including a radiator, a passenger compartment air conditioning heater, and an oil heat exchanger. It is to secure the heater performance and the oil heat exchanger warmer / cooler function.

  The cooling device of the present invention is a cooling device for a vehicle engine that cools the engine body by passing cooling water through a water jacket formed in the engine body.

  The cooling device is a path connecting a water pump provided at the water jacket inlet, the water jacket outlet and a suction port of the water pump, and a radiator path in which a radiator is interposed And a bottom bypass path that bypasses the radiator by connecting the water jacket outlet and the water pump inlet, a downstream end of the water pump, a downstream end of the radiator path, and a downstream of the bottom bypass path The valve is provided between the ends, and when the engine is cold, the bottom bypass path side is opened and the radiator path is closed, while when the engine is warm, the bottom bypass path side is closed and the radiator is closed. A thermostat valve for opening the path, the water jacket outlet and the water port Heat exchange between the cooling water and a heater path in which a passenger compartment air conditioner heater is interposed in the middle, and at least one of engine oil and automatic transmission oil And a heat exchanger interposed in the middle of the bottom bypass path.

  Then, the downstream side of the heat exchanger in the bottom bypass path is branched into two, and the branch path is connected downstream of the heater in the heater path, or from the radiator path side to the bottom bypass path side. It connects to the downstream of the radiator in the said radiator path through the check valve which prevents a backflow.

  According to this configuration, the radiator path extends from the water jacket outlet of the engine body to the water pump provided at the water jacket inlet via the radiator and the thermostat valve. A bottom bypass path provided in parallel with the radiator path reaches the water pump from the water jacket outlet through a thermostat valve.

  The thermostat valve opens the bottom bypass path side when the engine is cold and closes the radiator path, while closing the bottom bypass path side and opens the radiator path when the engine is warm. Thereby, when the engine is cold, the cooling water flows from the water jacket outlet to the water pump via the bottom bypass path. As a result, the cooling water is not cooled by the radiator, and the engine can be warmed up quickly. On the other hand, when the engine is warm, the cooling water flows from the water jacket outlet through the radiator path to the water pump, and the cooling water is cooled by the radiator.

  Also, a heater for connecting the water jacket outlet of the engine body and the water pump is provided with a heater for vehicle compartment air conditioning (for heating), thereby, separately from the radiator route or the bottom bypass route, A circuit in which cooling water circulates between the engine body and the heater is formed.

  The bottom bypass path is provided with a heat exchanger that performs heat exchange between at least one of the engine oil and the automatic transmission oil and the cooling water. As described above, since the cooling water flows through the bottom bypass path when the engine is cold, heat exchange is performed between the cooling water and the oil whose temperature rises earlier than the oil, and the oil is heated up early. . Thereby, the friction of the engine and / or the automatic transmission is reduced, and the fuel consumption is improved.

  Further, in the bottom bypass path, the downstream side of the heat exchanger (between the heat exchanger and the thermostat valve) branches, and the branch path is connected downstream of the heater in the heater path, or the radiator path It is connected to the downstream side of the radiator in the radiator path via a check valve that prevents back flow from the side to the bottom bypass path side.

  When the above branch path is connected downstream of the heater in the heater path, even when the bottom bypass path side is closed by the thermostat valve in the warm state, the cooling water flows through the bottom bypass path and the oil and the cooling water Heat exchange takes place. In this case, the heat exchanger functions as a warmer or a cooler according to the level of the cooling water temperature and the oil temperature. In addition, although the flow volume which flows through a heater falls by connecting a branch path | route to the downstream of a heater path | route, since high heater performance is not requested | required at the time of a warm, the problem by that does not arise. In addition, when the branch path is connected downstream of the heater in the heater path, the cooling water flows downstream of the heater through the branch path even during cold weather. For example, the diameter of the branch path is set to the bottom bypass path. By making the diameter smaller than the diameter, it is possible to suppress the flow rate to the heater path, thereby ensuring desired heater performance. A flow from the bypass path to the heater path may be prevented by providing a check valve or the like on the branch path.

  On the other hand, when the branch path is connected downstream of the radiator in the radiator path, the cooling water flows to the radiator path side via the check valve even when the bottom bypass path side is closed by the thermostat valve in the warm state. As a result, heat exchange is performed between the oil and the cooling water in the heat exchanger. That is, the heat exchanger functions as a warmer or cooler. Note that the back flow from the radiator path side to the bottom bypass path side is blocked by the check valve during the warm period. On the other hand, when the branch path is connected downstream of the radiator in the radiator path, the cooling water does not flow toward the radiator path when cold.

  In this way, in the cooling device including the radiator, the indoor air conditioning heater, and the heat exchanger, the heat exchanger is interposed in the bottom bypass path, thereby preventing the flow rate of the cooling water flowing through the heater from being lowered. Desired heater performance can be ensured in a short time.

  Further, by branching the downstream side of the heat exchanger in the bottom bypass path and connecting the branch path to the heater path or the radiator path, the heat exchanger can function as an oil warmer / cooler. it can.

  In addition, since the cooling device has a configuration in which a heat exchanger is interposed in the bottom bypass path and the path is only branched and merged, there are few changes from the conventional cooling apparatus that does not include the heat exchanger. It is possible to suppress an increase in cost.

  The cooling device is attached to the engine body and communicates with the water jacket outlet, and has a water outlet member having three outlet ports for the radiator path, the heater path, and the bottom bypass path, and the engine A thermostat housing provided in the main body and communicating with the suction port of the water pump and having three inflow ports for the radiator path, the heater path, and the bottom bypass path, in which the thermostat valve is incorporated; The radiator path, the heater path, and the bottom bypass path are respectively connected to the radiator, the heater, and the heat exchanger, and each port of the water outlet and each port of the thermostat housing. Formed by , The branch path, and the pipe forming the bottom bypass path may be formed by the cooling water pipe is connected to the pipe forming the heater path or radiator path.

  The water outlet member having three outflow ports for the radiator route, the heater route, and the bottom bypass route can be the same as the water outlet member of the conventional cooling device having no heat exchanger. Further, the thermostat housing having the three inflow ports for the radiator path, the heater path, and the bottom bypass path may have the same configuration as the thermostat housing of the cooling device having no heat exchanger. In other words, a cooling device that secures the heater performance and the warmer / cooler function of the oil heat exchanger just by changing the routing of the cooling water pipe forming the radiator path, the heater path, and the bottom bypass path from the conventional cooling apparatus. Composed. Therefore, the cost can be reduced and the engine body can be shared.

  The cooling device further includes a pressure relief path that is connected to the bottom bypass path and bypasses the heat exchanger, and a pressure relief valve that is opened at a predetermined pressure is provided in the middle of the cooling apparatus. May be.

  As described above, the heat exchanger has a high flow path resistance, and in the configuration in which the heat exchanger is provided in the bottom bypass path, the pressure in the path is increased particularly in the cold state. As a result, for example, there is a possibility that disconnection or the like may occur at the connection portion of the pipe.

  Therefore, a pressure relief path that bypasses the heat exchanger is further provided, and a pressure relief valve is interposed in the pressure relief path. As a result, when the pressure in the path is low during cold, the pressure relief valve is closed and all the cooling water flowing through the bottom bypass path passes through the heat exchanger, thereby increasing the heat exchange efficiency. On the other hand, if the pressure in the path increases, the pressure relief valve opens to reduce the pressure in the path, thereby preventing the pipe from being disconnected at the connecting portion.

  As described above, the cooling device for a vehicle engine according to the present invention can prevent a decrease in the performance of the passenger compartment air conditioning heater provided in the heater path by providing the heat exchanger in the bottom bypass path. it can. Further, by branching the downstream side of the heat exchanger and connecting the branch path to a heater path or a radiator path, the heat exchanger can function as an oil warmer / cooler. In addition, ensuring the heater performance and ensuring the warmer / cooler function of the heat exchanger can be realized simply by changing the piping arrangement, so that costs can be reduced and the engine can be shared.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 shows a schematic configuration of an engine 1 according to Embodiment 1 of the present invention. Although not shown, the engine 1 has four cylinders from the front side (front side in FIG. 1) in the longitudinal direction of the main body (the direction from the left front side to the right rear side in FIG. 1). These are in-line four-cylinder engines arranged in order toward the rear side (the back side in FIG. 1), and are arranged horizontally in the engine room so that the crankshaft is in the vehicle width direction. An automatic transmission 2 is disposed on the rear side of the engine 1.

  In this figure, 11 is a cylinder block, 12 is a cylinder head disposed above the cylinder block 11, 13 is a cylinder head cover disposed above the cylinder head 12, and 14 is the left side of the engine (the rear side of the engine). FIG. 1 is an intake manifold that is disposed on the left side when viewed from the front side and is on the front side of FIG. 1 and introduces intake air into the cylinders (combustion chambers). The exhaust system is provided on the right side when viewed from the front side (the back side in FIG. 1), although not shown.

  A water jacket (not shown) is formed inside the engine body 10 including the cylinder block 11 and the cylinder head 12. A discharge port of the water pump 16 is connected to the inlet of the water jacket. The water pump 16 is disposed at an upper front position on the left side surface of the cylinder block 11 and is connected to a crank pulley 15 disposed on the front side of the engine 1 by a V-belt (not shown). . Thus, the water pump 16 is driven by the crankshaft.

  A thermostat housing 4 communicating with the suction port of the water pump 16 is provided at the upper front position on the left side surface of the cylinder block 11. The thermostat housing has three inflow ports 41, 42, and 43, and a thermostat valve is built in the housing.

  More specifically, as shown in FIGS. 1 and 2, the thermostat housing 4 includes a recess 46 that is recessed on the left side surface of the cylinder block 11 and communicates with the suction port of the water pump 16, and a mounting flange 44. The thermostat valve 45 includes the thermostat valve 45, and the thermostat valve 45 is built in the recess 46 by attaching the mounting flange 44 to the opening of the recess 46. The thermostat housing 4 has a bypass inflow port 41 opened on the upper surface side thereof, and has two ports, a heater inflow port 42 protruding outward from the mounting flange 44 and a radiator inflow port 43. And a total of three inflow ports.

  The thermostat valve 45 is, for example, a wax type. When the cooling water temperature is low, the wax contracts and the urging force of the spring moves the valve body in the axial direction of the spring to close the radiator inflow port 43 and the above. Open the bypass inflow port 41. On the other hand, when the cooling water temperature exceeds a predetermined temperature, the valve body moves in the axial direction of the spring due to the expansion of the wax, thereby opening the radiator inflow port 43 and closing the bypass inflow port 41. Thus, the thermostat valve 45 selectively opens the bypass inflow port 41 and the radiator inflow port 43 in accordance with the cooling water temperature, and connects the bypass inflow port 41 or the radiator inflow port 43 to the water pump 16. . The heater inflow port 42 has no on-off valve and is always in communication with the water pump 16.

  As shown in FIGS. 1 and 3, a water outlet member 5 is attached to the rear side surface of the cylinder head 12. As shown in FIG. 4, the water outlet member 5 includes a flange 51 attached to the cylinder head 12 and a main body 52 projecting outward from the flange 51. The main body 52 is formed with a common flow path 53 that communicates with the outlet 17 of the water jacket and extends to the rear of the engine. ) And an outlet port 54 that opens to the left side of the engine (front side of the vehicle), and a radiator outlet port 55 that opens. In addition, a bypass outlet port 56 that communicates with the lower portion of the common flow path 53 and that opens to the front side of the vehicle is provided at an intermediate portion in the flow direction of the common flow path 53. Has a total of three outflow ports. The heater outlet port 54 has a smaller diameter than the radiator outlet port 55.

  As shown in FIG. 1, an ATF warmer / cooler 6 having a substantially cylindrical shape is disposed near the boundary between the engine body 10 and the automatic transmission 2 at the lower position of the left side surface of the cylinder block 11. Yes. The ATF warmer / cooler 6 exchanges heat between cooling water and automatic transmission oil (ATF), and has two oil ports, an oil inflow port 61 and an oil outflow port 62, on the front end surface thereof. Is formed. The oil inflow port 61 is connected to a side portion of the automatic transmission 2 and is connected to an oil pipe 63 through which oil flows from the automatic transmission 2 toward the ATF warmer / cooler 6. An oil return pipe 64 through which oil flows from the ATF warmer / cooler 6 toward the automatic transmission 2 is connected to the side portion 62 of the automatic transmission 2.

  Further, two cooling water ports, a cooling water inflow port 65 and a cooling water outflow port 66, are formed on the peripheral side surface of the ATF warmer / cooler 6, and will be described in detail later. Are connected to a bypass pipe 81 for flowing cooling water into the ATF warmer / cooler 6, and a bypass return pipe 82 for flowing cooling water from the ATF warmer / cooler 6 is connected to the cooling water outflow port 66. The

  Next, the piping configuration of the cooling device will be described with reference to FIGS.

  One end of the heater pipe 31 is connected to the heater outlet port 54 of the water outlet member 5. The heater pipe 31 extends to the rear side of the vehicle, and the other end is connected to a passenger compartment air conditioning heater 33 (not shown in FIG. 1). In addition, one end of a heater return pipe 32 is connected to the passenger compartment air conditioning heater 33, and the heater return pipe 32 is disposed along the heater pipe 31, below the water outlet member 5. 1 and extends to the left side of the engine 1 as shown in FIG. In FIG. 1, a part of the heater return pipe 32 is not shown. The other end of the heater return pipe 32 is connected to the heater inflow port 42 of the thermostat housing 4.

  One end of a radiator pipe 71 is connected to the radiator outlet port 55 of the water outlet member 5, and the other end of the radiator pipe 71 is disposed at the front end position of the vehicle, although not shown in FIG. Connected to the radiator 73. One end of a radiator return pipe 72 is connected to the radiator 73, and the other end is connected to the radiator inflow port 43 of the thermostat housing 4.

  One end of a bypass pipe 81 is connected to the bypass outlet port 56 of the water outlet member 5, and the other end of the bypass pipe 81 is connected to the cooling water inlet port 65 of the ATF warmer / cooler 6. One end of a bypass return pipe 82 is connected to the cooling water outflow port 66 of the ATF warmer / cooler 6, and the other end of the bypass return pipe 82 is connected to the bypass inflow port 41 of the thermostat housing 4. Has been. A branch pipe 83 is provided in the middle of the bypass return pipe 82, and the branch bypass return pipe 84 connected to the branch pipe 83 is connected to the junction pipe 34 provided in the heater return pipe 32. It is connected. As a result, the branch bypass return pipe 84 is connected to the heater inflow port 42 of the thermostat housing 4. The branch bypass return pipe 84 has a smaller diameter than the bypass return pipe 82.

  Thus, the heater pipe 31, the heater 33, and the heater return pipe 32 form the heater path 3 that connects the water jacket outlet 17 and the suction port of the water pump 16, and the radiator pipe 71, the radiator 73, and The radiator return pipe 72 forms a radiator path 7 that connects the water jacket outlet 17 and the suction port of the water pump 16.

  The bypass pipe 81, the ATF warmer cooler 6, and the bypass return pipe 82 form a bottom bypass path 8 that bypasses the radiator, and the downstream side of the ATF warmer cooler 6 in the bottom bypass path 8 branches off. The branch path (branch bypass return pipe 84) is connected to the downstream side of the heater 33 in the heater path 3.

  In this cooling device, since the thermostat valve 45 is interposed between the suction port of the water pump 16 and the downstream end of the radiator path 7 and the downstream end of the bottom bypass path 8, as described above. When the engine is cold, the bottom bypass path 8 is opened and the radiator path 7 is closed. Thereby, the cooling water flows and circulates in the order of the water jacket, the water outlet member 5, the bypass pipe 81, the ATF warmer cooler 6, the bypass return pipe 82, the thermostat housing 4, and the water pump 16. In this way, in the ATF warmer / cooler 6, heat exchange is performed between the cooling water and the ATF whose temperature is raised relatively early, and the ATF is heated quickly. The cooling water flows and circulates in the order of the water jacket, the water outlet member 5, the heater pipe 31, the heater 33, the heater return pipe 32, the thermostat housing 4, and the water pump 16, and heat exchange is performed in the heater 33. At this time, the branch bypass return pipe 84 is connected to the heater return pipe 32, so that a flow of cooling water from the bottom bypass path 8 to the heater path 3 occurs. Since the diameter is smaller than that of the bypass return pipe 82, the flow rate of the cooling water flowing from the bottom bypass path 8 to the heater path 3 via the branch bypass return pipe 84 is small. As a result, the desired performance of the heater 33 is ensured without reducing the cooling water flow rate in the heater path 3.

  On the other hand, when the engine is warm, the bottom bypass path 8 is closed and the radiator path 7 is opened. Thus, the cooling water flows and circulates in the order of the water jacket, the water outlet member 5, the radiator pipe 71, the radiator 73, the radiator return pipe 72, the thermostat housing 4, and the water pump 16. Thus, the cooling water is cooled by the radiator 73. Further, since the branch bypass return pipe 84 is connected to the heater return pipe 32, the cooling water flows through the bottom bypass path 8 even when the engine is warm. As a result, heat exchange is performed between the cooling water and the ATF in the ATF warmer cooler 6. When the cooling water temperature is higher than the ATF temperature, the ATF warmer cooler 6 serves as an ATF warmer and the cooling water temperature is ATF. When it is lower than the temperature, it functions as an ATF cooler. Furthermore, as described above, the cooling water flows from the bottom bypass path 8 to the heater path 3 even when the engine is warm, but since the high heater 33 performance is not required during the warm period, there is no inconvenience due to this.

  In this way, the function as the ATF warmer / cooler 6 can be ensured while ensuring the desired heater performance.

  Each of the water outlet member 5 and the thermostat housing 4 has three ports, which are not changed in design from the conventional water outlet member 5 and the thermostat housing 4. In other words, the cooling device has the same water outlet member 5 and thermostat housing 4 as the conventional one, but the ATF warmer / cooler 6 is provided in the bottom bypass path 8 and branches from the bypass return pipe 82 to return to the heater return. This is realized simply by adding a branch bypass return pipe 84 that joins the pipe 32. As a result, cost reduction and common use of the engine 1 can be achieved.

(Embodiment 2)
FIG. 6 shows a piping configuration of a cooling device according to Embodiment 2 of the present invention. This cooling device is the same as the cooling device of the first embodiment in that the ATF warmer / cooler 6 is provided in the bottom bypass path 8 and that the downstream side is branched. The point that the pipe 84 is connected to the downstream of the radiator 73 in the radiator path 7 via the check valve 91 is different from the cooling device of the first embodiment.

  In the cooling device according to the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The check valve 91 allows a flow from the bottom bypass path 8 toward the radiator path 7 and prevents a flow in the opposite direction.

  The cooling device further includes a pressure relief pipe 92 that branches in the middle of the bypass pipe 81 and merges with the bypass return pipe 82. The pressure relief pipe 92 is opened at a predetermined pressure. A pressure relief valve 93 is interposed. The pressure relief path 9 is formed by the pressure relief pipe 92 and the pressure relief valve 93.

  Even in this cooling device, when the engine is cold, the bottom bypass path 8 is opened and the radiator path 7 is closed by the thermostat valve 45, so that the cooling water flows through the bottom bypass path 8, and the ATF warmer cooler 6 ATF is raised in temperature. The cooling water that has passed through the ATF warmer / cooler 6 flows into the thermostat housing 4.

  The cooling water passes through the heater path 3 and exchanges heat in the heater 33. However, the cooling water flow rate in the heater path 3 does not decrease, and desired heater performance is ensured.

  On the other hand, when the engine is warm, the thermostat valve 45 closes the bottom bypass path 8 and opens the radiator path 7, so that the cooling water flows through the radiator path 7, so that the cooling water flows in the radiator 73. To be cooled. At this time, the branch bypass return pipe 84 is connected to the downstream side of the radiator 73 in the radiator path 7, but the check valve 91 is interposed in the connection portion, and therefore, the radiator path 7 to the bottom bypass path 8. The flow of cooling water to is blocked. On the other hand, although the thermostat valve 45 is closed, the branch bypass return pipe 84 is connected to the radiator path 7, whereby cooling water flows through the bottom bypass path 8, thereby the ATF warmer cooler. 6 can function as an ATF warmer or ATF cooler.

  Thus, the function of the ATF warmer / cooler 6 can be ensured while ensuring the desired heater performance. Moreover, in this cooling device, the water outlet member 5 and the thermostat housing 4 are the same as the conventional one, but the branch bypass return pipe 84 branched from the bypass return pipe 82 and joined to the radiator return pipe 72 and relatively inexpensive. This is realized simply by providing a simple check valve 91. As a result, cost reduction and engine sharing can be achieved.

  Further, in the cooling device, by providing the pressure relief path 9 that bypasses the bottom bypass path 8, it is possible to prevent the piping from coming off. That is, since the flow resistance of the ATF warmer / cooler 6 is relatively large, circulation of the cooling water is suppressed when the cooling water flows through the bottom bypass path 8 when the engine is cold. When the circulation of the cooling water is suppressed, there is a possibility that the piping may come off due to an increase in the pressure in the pipe. Therefore, by providing a pressure relief valve 93 in the pressure relief path 9, when the pressure in the pipe is low, the pressure relief valve 93 is closed so that the cooling water flows to the ATF warmer / cooler 6 side. If the pressure in the pipe is increased while the heat exchange efficiency is increased, the pressure relief valve 93 is opened to reduce the pressure, thereby preventing the pipe from coming off.

  In the cooling device according to the first embodiment, the pressure relief path 9 that bypasses the bottom bypass path 8 can be provided, and the pressure relief valve 93 can be interposed on the path.

  Instead of the ATF warmer / cooler 6, an engine oil heat exchanger may be provided in the bottom bypass path 8. Further, the ATF warmer / cooler 6 and the heat exchanger for engine oil may be provided in series with the bottom bypass path 8.

1 is a perspective view of an engine according to Embodiment 1. FIG. It is sectional drawing of a thermostat valve 45 housing. It is a perspective view of an engine which expands and shows the portion by the side of the outflow side of a water jacket. It is sectional drawing of a water outlet member. 2 is a piping diagram of the cooling device according to Embodiment 1. FIG. 6 is a piping diagram of a cooling device according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 10 Engine main body 11 Cylinder block 12 Cylinder head 16 Water pump 3 Heater path 31 Heater pipe 32 Heater return pipe 33 Car compartment air conditioner heater 4 Thermostat housing 41 Bypass inflow port 42 Heater inflow port 43 Radiator inflow port 45 Thermostat valve 5 Water Outlet member 54 Heater outflow port 55 Radiator outflow port 56 Bypass outflow port 6 ATF warmer cooler (heat exchanger)
7 Radiator path 71 Radiator pipe 72 Radiator return pipe 73 Radiator 8 Bottom bypass path 81 Bypass pipe 82 Bypass return pipe 84 Branch bypass return pipe (branch path)
9 Pressure relief path 91 Check valve 92 Pressure relief pipe 93 Pressure relief valve

Claims (3)

A cooling device for a vehicle engine that cools the engine body by passing cooling water through a water jacket formed in the engine body,
A water pump provided at the water jacket inlet,
A path connecting the water jacket outlet and the suction port of the water pump, and a radiator path in which a radiator is interposed,
A bottom bypass path connecting the water jacket outlet and the water pump suction port to bypass the radiator;
A valve interposed between the suction port of the water pump, the downstream end of the radiator path, and the downstream end of the bottom bypass path, and when the engine is cold, opens the bottom bypass path side and opens the radiator path. A thermostat valve that closes the bottom bypass path and opens the radiator path when the engine is warm,
A path connecting the water jacket outlet and the suction port of the water pump, and a heater path in which a heater for air conditioning of the passenger compartment is interposed,
A heat exchanger for exchanging heat between at least one of engine oil and automatic transmission oil and the cooling water, comprising a heat exchanger interposed in the middle of the bottom bypass path,
The downstream side of the heat exchanger in the bottom bypass path is branched into two, and the branch path is connected to the downstream side of the heater in the heater path or backflow from the radiator path side to the bottom bypass path side. A cooling device connected downstream of the radiator in the radiator path via a check valve for preventing The cooling device according to claim 1, wherein
A water outlet member attached to the engine body and communicating with the water jacket outlet, and having three outlet ports for the radiator path, heater path, and bottom bypass path;
A thermostat housing that is provided in the engine body and communicates with a suction port of the water pump and has three inflow ports for the radiator path, a heater path, and a bottom bypass path, in which the thermostat valve is incorporated; Further comprising
The radiator path, the heater path, and the bottom bypass path are each formed by a cooling water pipe connected to the radiator, the heater, and the heat exchanger, and each port of the water outlet and each port of the thermostat housing.
The said branch path is a cooling device formed with the cooling water pipe connected to the pipe which forms the said bottom bypass path | route, and the pipe which forms the said heater path | route or a radiator path | route. The cooling device according to claim 1, wherein
A cooling device further comprising a pressure relief path that is connected to the bottom bypass path and bypasses the heat exchanger, and a pressure relief valve that opens at a predetermined pressure is provided in the middle of the path.

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