JP5573768B2 - Cooling device for internal combustion engine - Google Patents

Description

  The present invention relates to a cooling device for an internal combustion engine.

  Conventionally, various proposals have been made regarding the circulation of cooling water in an internal combustion engine. For example, Patent Literature 1 includes an internal combustion engine that includes two types of thermostats having different valve opening temperatures and two shutter valves HS and LS that are operated by an actuator to switch between high water temperature control and low water temperature control. A cooling device is disclosed.

JP-A-7-91251

  The internal combustion engine cooling device disclosed in Patent Document 1 includes two types of thermostats and an actuator for driving the shutter valves HS and LS. Increasing the number of these parts is disadvantageous in terms of mounting on the vehicle and cost.

  Therefore, an object of the cooling device for an internal combustion engine disclosed in this specification is to perform fine control of the coolant flow while reducing the number of actuators.

  In order to solve the above-described problem, a cooling apparatus for an internal combustion engine disclosed in the present specification communicates a first coolant passage that communicates an outlet of a water pump and the internal combustion engine, and an inlet of the water pump and a radiator bypass passage. A second cooling water passage, a first control valve provided in the first cooling water passage, and a second control valve provided in the second cooling water passage, wherein the first control valve A collision plate that is displaced by collision of the flow of cooling water in the first cooling water passage is provided, the open / close state is changed depending on the position of the collision plate, and the second control valve opens and closes according to the displacement of the collision plate. Change state.

  The opening / closing state of the first control valve is changed using the force of the cooling water flow, and the opening / closing state of the second control valve is changed using the force by which the first control valve is displaced. Thereby, it is possible to perform fine cooling water flow control while reducing the number of actuators.

  The first control valve includes a rotating shaft member, and rotates when a flow of cooling water collides with the collision plate. The second control valve includes a valve portion and the valve portion on one end side. And an arm member that is rotatably supported, and the first control valve that rotates is brought into contact with the other end of the arm member and is opened by the rotational force of the first control valve.

  The rotational force of the first control valve resulting from the fluid force is transmitted to the second control valve via the arm member. That is, utilizing the lever principle, the rotational force of the first control valve is transmitted to the second control valve, and the second control valve is opened.

  The first cooling water passage includes a valve housing portion that is accommodated when the first control valve is in an open state, and the valve housing portion communicates with the second cooling water passage through a communication passage. The other end portion of the arm member may protrude from the valve accommodating portion through the communication path. Since the second cooling water passage is at the inlet side of the water pump, the pressure is low, and the valve accommodating portion becomes negative pressure due to suction of the water pump, so that the first control valve can be easily moved to the valve opening side. . Since the region where the arm member is exposed is isolated from the first cooling water passage by the collision plate, no special sealing means for isolating the first cooling water passage and the valve housing portion that are at high pressure is necessary.

  The first control valve includes a fixing hole into which a fixing pin having a tapered outer peripheral surface is inserted at a distal end portion, and the fixing hole has a tapered inner peripheral surface corresponding to the outer peripheral surface of the fixing pin. The fixing pin is inserted into the fixing hole while pressing the outer peripheral surface against the inner peripheral surface of the fixing hole, and can displace the first control valve in the valve closing direction.

  The first control valve can be moved to the valve closing side by inserting the fixing pin into the fixing hole while the outer peripheral surface of the fixing pin having a tapered shape and the inner peripheral surface of the fixing hole are in contact with each other. When the first control valve moves to the valve closing side, the second control valve can also return to the valve closing side. Each valve can be closed at an arbitrary timing by driving the fixing pin with a solenoid.

  According to the cooling device for an internal combustion engine disclosed in this specification, it is possible to perform fine control of the coolant flow while reducing the number of actuators.

FIG. 1 is an explanatory diagram illustrating the cooling device according to the first embodiment in a water stop state. FIG. 2 is a block diagram illustrating a relationship between the control unit and the solenoid of the cooling device according to the first embodiment. FIG. 3 is a perspective view of a sector valve provided in the cooling device of the first embodiment. FIG. 4 is a five-side view of the sector valve included in the cooling device of the first embodiment. FIG. 5 (A) shows the state of the fan valve in the water stop state, and FIG. 5 (B) is an explanatory view showing the state of the fan valve in the high temperature maintaining state. FIG. 6 is an explanatory diagram illustrating the cooling device according to the first embodiment in a high temperature maintaining state. FIG. 7 is an explanatory diagram showing the cooling device of the first embodiment in a low temperature transition state. 8A and 8B are explanatory diagrams of a fan-type valve closing mechanism. FIG. 8A shows a state when the fan-shaped valve is opened, and FIG. 8B shows a state when the fan-shaped valve is started to close. FIG. 8C is an explanatory view showing a closed state of the fan valve.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, in the drawings, the dimensions, ratios, and the like of each part may not be shown so as to completely match the actual ones. Further, details may be omitted depending on the drawings. In addition, for convenience of explanation, the mounting direction of parts may be different from the actual one.

  First, a schematic configuration of a cooling device for an internal combustion engine (hereinafter referred to as “cooling device” in this specification) 1000 according to a first embodiment will be described with reference to FIG.

  The cooling device 1000 includes a first coolant passage 10 that communicates the outlet 51 of the water pump 50 and the internal combustion engine 100, and a second coolant passage 11 that communicates the inlet 52 of the water pump 50 and the radiator bypass passage 11a. ing. Further, the cooling 1000 includes a fan valve 20 provided in the first cooling water passage 10. The sector valve 20 is an example of a first control valve. The cooling device 1000 includes a butterfly valve 40 as a second control valve provided in the second cooling water passage 11.

  The water pump 50 is powered from the crankshaft of the internal combustion engine 100 via the pulley 53, but may be another type of water pump such as an electric type.

  The cooling device 1000 includes a solenoid 30 that controls the state of the sector valve 20. The solenoid 30 is provided with a fixing pin 31. As shown in FIG. 2, the solenoid 30 is electrically connected to an ECU (Electronic control unit) 70. A water temperature sensor 60 is electrically connected to the ECU 70, and the solenoid 30 operates based on information acquired from the water temperature sensor 60. The solenoid 30 includes a spring member 33. The solenoid 33 pulls in the fixing pin 31 while compressing the spring member 33 when energized. The solenoid 30 only needs to be able to position the sector valve 20. That is, since the solenoid 30 does not need to operate the fan-shaped valve 20 itself, its output may be small. Note that the solenoid 30 in FIG. 1 is drawn in a direction different from the direction in which it is actually mounted for convenience of explanation.

  The first cooling water passage 10 communicates with a water jacket provided in the cylinder block 101. The fan-shaped valve 20 corresponding to the first control valve is fixed by the solenoid 30 at a position where the flow of the cooling water to the cylinder block 101 is interrupted and a position where the cooling water is allowed to flow into the cylinder block 101. Here, the configuration of the sector valve 20 will be described with reference to FIGS. 3 and 4. FIG. 3 is a perspective view of the sector valve 20. 4 is a five-side view of the fan-shaped valve 20. FIG. 4 (A) is a front view, FIG. 4 (B) is a left side view, FIG. 4 (C) is a right side view, and FIG. FIG. 4 (E) is a bottom view.

  As shown in FIG. 4A, the sector valve 20 has a sector shape with a central angle of 90 ° when viewed from the front. The sector valve 20 includes a collision plate 21 with which the flow of cooling water in the first cooling water passage 10 collides. A side plate 22 is also provided. The side plate 22 is provided with a first engagement hole 23a and a second engagement hole 23b. The sector valve 20 includes a rotating shaft member 25 and is rotatably mounted in the first cooling water passage 10 by the rotating shaft member 25. The cooling device 1000 is equipped with a spring member 26, and the sector valve 20 is urged by the spring member 26 to close the first cooling water passage 10, that is, in a direction against the flow of the cooling water. ing. Such a fan-shaped valve 20 is displaced when the flow of the cooling water in the first cooling water passage 10 collides with the collision plate 21, that is, rotates around the rotation shaft member 25 as the rotation axis, and changes the open / close state.

  The first cooling water passage 10 includes a valve accommodating portion 10a that is accommodated when the first control valve is opened. The valve accommodating portion 10 a communicates with the second cooling water passage 11 through the communication passage 15. More specifically, the valve accommodating portion 10a communicates with a thermostat valve accommodating portion 12 described in detail later. An arm member 43 described later is inserted into the communication path 15.

  The butterfly valve 40 corresponding to the second control valve includes a valve portion 41 and an arm member 43 that is disposed at one end side and is rotatably supported by a shaft member 42. The other end of the arm member 43 protrudes into the valve accommodating portion 10a. The other end projecting from the valve accommodating portion 10 a abuts on the rotating sector valve 20 and opens the valve portion 41 by the rotational force of the sector valve 20. When the butterfly valve 40 is not pushed by the fan-shaped valve 20, the valve unit 40 is installed in a state of closing the flow path leading to the inlet 52 of the water pump 50. The valve part 40 is set in the thermostat housing part 12 with the center of gravity set at a position where the flow path closed state can be maintained. In addition, you may create the state which obstruct | occludes the flow path of the valve part 40 by installing a spring member etc.

  FIG. 5A shows the state of the fan-shaped valve 20 in the water stop state, and FIG. 5B shows the fan-shaped valve 20 in the case where it is desired to keep the cooling water at a high temperature after the warm-up is completed. It is explanatory drawing which shows the state of. As shown in FIG. 5A, the sector valve 20 is in a closed state when the collision plate 21 is positioned to divide the first cooling water passage 10. Then, as shown in FIG. 5B, when the collision plate 21 is pushed by the flow of the high-pressure cooling water discharged from the water pump 50 and rotates around the rotating shaft member 25 as the rotating shaft, the valve opens. . That is, the sector valve 20 can open the first cooling water passage 10.

  The second cooling water passage 11 of the cooling device 1000 communicates with the radiator bypass passage 11a. The second cooling water passage 11 is provided with a thermostat valve storage portion 12 and a thermostat valve 80 is mounted. The second cooling water passage 11 is separated from the radiator passage 13 by a main valve portion 82 provided in the thermostat valve 80. The temperature sensing part 81 of the thermostat valve 80 is arranged in the thermostat valve storage part 12. The thermostat valve 80 includes a sub valve portion 83 that closes the second cooling water passage 11. A butterfly valve 40 is disposed on the downstream side of the thermostat valve 80. An inlet 52 of the water pump 50 is located on the downstream side of the butterfly valve 40. For this reason, when the butterfly valve 40 is in the closed state, the circulation of the cooling water in the second cooling water passage 11 is delayed, and the inflow of the cooling water from the radiator bypass passage 11a is restricted. As a result, the amount of cooling water supplied to the temperature sensing unit 81 is reduced, and the thermostat valve 80, which is difficult to obtain the amount of heat, is difficult to open. That is, when it is desired to keep the internal combustion engine 100 in a high water temperature state, the butterfly valve 40 is closed. On the other hand, when the internal combustion engine 100 is desired to be cooled, the butterfly valve is opened, the thermostat valve 80 restricts the inflow of cooling water from the radiator bypass passage 11a, and permits the inflow of cooling water from the radiator. .

  The cooling device 1000 is provided with a heater passage 14 through which cooling water returned from the heater flows. The heater passage 14 is provided in parallel with the second cooling water passage 11 and merges with the second cooling water passage 11 in front of the inlet 52 of the water pump 50.

  The circulation state of the cooling water realized by the cooling device 1000 as described above will be described with reference to FIGS. FIG. 1 shows the cooling device 1000 in a water stop state as described above. FIG. 6 is an explanatory diagram showing the cooling device 1000 when it is desired to maintain the cooling water at a high temperature after the warm-up is completed, that is, after the completion of warming. FIG. 7 is an explanatory view showing the cooling device 1000 when cooling water is desired to be cooled in order to avoid the overheating of the internal combustion engine, that is, the internal combustion engine.

  First, when it is desired to promote warm-up of the internal combustion engine, the water stop state shown in FIG. 1 is set. In order to set the water stop state, the fixing pin 31 is engaged with the first engagement hole 23 a of the sector valve 20. As a result, the collision plate 21 divides the first cooling water passage 10 and inhibits the cooling water from flowing into the cylinder block 101. At this time, the butterfly valve 40 maintains a closed state. Thereby, the flow of the cooling water on the outlet 51 side of the water pump 50 is blocked by the collision plate 21, and the flow of the cooling water on the inlet side 52 of the water pump 50 is blocked by the valve body 41 of the butterfly valve 40. As a result, the circulation of the cooling water in the internal combustion engine 100 is stopped, and the internal combustion engine 100 can be warmed up early.

  At this time, the circulation of the cooling water in the second cooling water passage 11 is also stagnant, and the thermostat valve 80 is difficult to open.

  Next, the high water temperature maintaining state shown in FIG. 6 will be described. For example, the internal combustion engine has been warmed up, but the temperature of the cooling water is desired to be maintained at a high temperature in accordance with friction reduction and other operating conditions. In order to change from the state shown in FIG. 1 to the state shown in FIG. 6, the solenoid 30 is once actuated to release the engagement of the fixing pin 31 with the first engagement hole 23a. Then, the cooling water pumped by the water pump 50 collides with the collision plate 21 and rotates the sector valve 20. At this time, the valve accommodating portion 10a becomes negative pressure through the communication passage 15 and is drawn in the valve opening direction, so that the sector valve 20 can be easily rotated in combination with the force of the fluid. Then, the energization of the solenoid 30 is released. Thereby, the fixing pin 31 urged by the spring member 33 is inserted into the second engagement hole 23b, and the sector valve 20 is fixed. When the collision plate 21 is pushed down, cooling water flows into the cylinder block 101. The cooling water flowing into the internal combustion engine 100 circulates from the cylinder block side to the cylinder head side. In this state, the butterfly valve 40 is still in the closed state.

  Next, the low water temperature transition state shown in FIG. 7 will be described. The low water temperature transition state is a state in which the temperature of the cooling water is desired to be lowered, for example, when the internal combustion engine is operated at a high load and high rotation. In order to change from the state shown in FIG. 6 to the state shown in FIG. 7, the solenoid 30 is operated. Thereby, the engagement of the fixing pin 31 to the second engagement hole 23b is released. Then, the cooling water pumped by the water pump 50 collides with the collision plate 21 and rotates the sector valve 20. Then, the fan-shaped valve 20 comes into contact with the arm member 43 and is further pushed in to open the butterfly valve 40. When the butterfly valve 40 is opened, the circulation of the cooling water in the second cooling water passage 11 becomes active. Then, high-temperature cooling water is supplied to the temperature sensing unit 81 from the radiator bypass passage 11a. When the temperature sensing part 81 is warmed, the thermostat valve 80 is actuated to open the main valve part 82, and the radiator passage 13 and the second cooling water passage 11 are communicated. Thereby, the cooling water cooled by the radiator is supplied. On the other hand, the sub valve portion 83 closes the radiator bypass passage 11a. As a result, the cooling water having a low temperature by the radiator circulates through the internal combustion engine 100.

  As described above, according to the cooling device 1000 of the first embodiment, the circulation of the cooling water can be controlled by the fan valve 20 and the butterfly valve 40 that are operated by the force of the fluid. Note that the flow rate of the cooling water can be changed by changing the position of the engagement hole with which the fixing pin 31 is engaged, and as a result, the desired cooling water temperature can be maintained. The position of the hooking hole can be set and changed for each actual machine. Furthermore, the cooling water temperature can be controlled more finely by increasing the number of engaging holes.

  Next, Example 2 will be described with reference to FIG. The second embodiment includes a fixing hole 27 into which the fixing pin 131 is inserted into the side plate 22. The fixing pin 131 is provided in place of the fixing pin 31 in the first embodiment. A tapered outer peripheral surface 131 a is provided at the tip of the fixing pin 131. The fixing hole 27 includes a tapered inner peripheral surface 27 a corresponding to the outer peripheral surface 131 a included in the fixing pin 131. The fixing pin 131 is inserted into the fixing hole 27 while pressing the outer peripheral surface 131a against the inner peripheral surface 27a of the fixing hole 27, and displaces the sector valve 20 corresponding to the first control valve in the valve closing direction. The operation of the fixing pin 131 will be specifically described.

  FIG. 8A shows a state when the sector valve 20 is opened. The solenoid 130 pulls in the fixing pin 131 when energized. Thereby, the fan-shaped valve 20 is rotated by the flowing force of the cooling water, and the valve is opened. Further, the butterfly valve 40 is also opened.

  FIG. 8B shows a state when the fan valve 20 starts to close. By stopping energization of the solenoid 130, the fixing pin 131 tries to return to the original position by the spring member 132. Accordingly, the outer peripheral surface 131 a of the fixing pin 131 comes into contact with the inner peripheral surface 27 a of the fixing hole 27.

  FIG. 8C shows the closed state of the sector valve 20. The fixing pin 131 enters the fixing hole 27 by being biased by the spring member 132. At this time, when the tapered outer peripheral surface 131a pushes the tapered inner peripheral surface 27a, the side plate 22, that is, the sector valve 20 is moved (rotated). Thereby, the sector valve 20 can be shifted to the valve closing state. If the sector valve 20 shifts to the closed state, the butterfly valve 40 can also shift to the closed state. Thus, the fan-shaped valve 20 and the butterfly valve 40 can be opened and closed at an arbitrary timing.

  The above embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to these, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.

DESCRIPTION OF SYMBOLS 10 1st cooling water channel | path 11 2nd cooling water channel | path 11a Radiator bypass channel | path 12 Thermostat valve accommodating part 13 Radiator channel | path 14 Heater channel | path 20 Fan valve (1st control valve)
21 Colliding plate 23a First engagement hole 23b Second engagement hole 25 Rotating shaft member 30, 131 Solenoid 31 Fixing pin 33 Spring member 40 Butterfly valve (second control valve)
DESCRIPTION OF SYMBOLS 50 Water pump 51 Outlet 52 Inlet 60 Water temperature sensor 80 Thermostat valve 81 Temperature sensing part 100 Internal combustion engine 1000 Cooling device

Claims (3)

A first cooling water passage communicating the outlet of the water pump and the internal combustion engine;
A second cooling water passage communicating the inlet of the water pump and the radiator bypass passage;
A first control valve provided in the first cooling water passage;
A second control valve provided in the second cooling water passage;
With
The first control valve includes a rotating shaft member and a collision plate that is rotatably mounted by the rotating shaft member and rotates when a flow of cooling water in the first cooling water passage collides, Change the open / close state depending on the position,
The second control valve that changes the open / closed state according to the position of the collision plate includes a valve portion, and an arm member that is rotatably supported while the valve portion is disposed on one end side. A cooling apparatus for an internal combustion engine , wherein the rotating first control valve is brought into contact with the other end portion of the member and is opened by a rotational force of the first control valve . The first cooling water passage includes a valve accommodating portion that is accommodated when the first control valve is opened.
The valve housing portion communicates with the second cooling water passage through a communication passage,
The cooling device for an internal combustion engine according to claim 1 , wherein the other end portion of the arm member protrudes into the valve housing portion through the communication path. The first control valve includes a fixing hole into which a fixing pin having a tapered outer peripheral surface is inserted at a tip portion,
The fixing hole includes a tapered inner peripheral surface corresponding to the outer peripheral surface of the fixing pin,
The internal combustion engine according to claim 1 , wherein the fixing pin is inserted into the fixing hole while pressing the outer peripheral surface against an inner peripheral surface of the fixing hole, and displaces the first control valve in a valve closing direction. Cooling system.

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