JP2019173564A - Internal combustion engine - Google Patents

Abstract

To turn a valve body of a solenoid valve into a desired state quickly when cutting off power supply.SOLUTION: An internal combustion engine comprises: a solenoid valve provided in a flow passage through which fluid flowing in the internal combustion engine flows, and having a valve body that controls the flow state of the fluid; and an attachment member fixing the solenoid valve to the internal combustion engine. The attachment member separates the solenoid valve from the internal combustion engine by a predetermined distance, and holds the solenoid valve in a state where the opening/closing direction of the valve body is matched with a piston sliding direction of the internal combustion engine.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal combustion engine.

  2. Description of the Related Art Conventionally, an internal combustion engine in which a solenoid valve is provided in a cooling water flow path for circulating cooling water is known (see, for example, Patent Document 1).

JP 2017-31910 A

  The solenoid valve switches the open / closed state of the valve body by turning on and off the energization. However, when the power is turned off, surface tension or residual magnetic force may be acting on the valve body, and the valve body may not be able to immediately transition to a desired state.

  Therefore, an internal combustion engine disclosed in the present specification has an object to immediately bring a valve body included in a solenoid valve into a desired state.

  An internal combustion engine disclosed in the present specification is provided in a flow path through which a fluid flowing in the internal combustion engine flows, and includes an electromagnetic valve having a valve body that controls a flow state of the fluid, and the electromagnetic valve is provided to the internal combustion engine. An attachment member for fixing, and the attachment member is configured to separate the electromagnetic valve from the internal combustion engine by a predetermined distance and to make the opening / closing direction of the valve body coincide with the piston sliding direction of the internal combustion engine. The electromagnetic valve is held.

  According to the internal combustion engine disclosed in the present specification, the valve body included in the electromagnetic valve can be immediately brought into a desired state.

FIG. 1 is an explanatory view schematically showing an internal combustion engine of an embodiment. FIG. 2 (A) schematically shows the closed state of the FSV of the embodiment, and FIG. 2 (B) is an explanatory view schematically showing the opened state of the FSV of the embodiment. FIG. 3 is a front view of the internal combustion engine of the embodiment. FIG. 4 is a side view of the internal combustion engine of the embodiment. FIG. 5 is a front view showing a state in which the FSV of the embodiment is held by a fixing member. FIG. 6 is a side view showing a state in which the FSV of the embodiment is held by a fixing member. FIG. 7 is a bottom view showing a state in which the FSV of the embodiment is held by a fixing member. FIG. 8A is a graph showing an example of vertical vibration of the internal combustion engine, FIG. 8B is a graph showing an example of horizontal vibration of the internal combustion engine, and FIG. 8C is an internal combustion engine. It is a graph which shows an example of the vibration of the front-back direction. FIG. 9 is a graph showing how the valve body opens when vibration is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying 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. In some cases, details are omitted in some drawings.

(Embodiment)
Referring to FIG. 1, an internal combustion engine cooling device 100 is incorporated in the internal combustion engine 101. The internal combustion engine 101 of this embodiment is an in-line four-cylinder internal combustion engine. The internal combustion engine 101 is mounted on a vehicle (not shown), and is cooled by being supplied with cooling water by the internal combustion engine cooling device 100. The internal combustion engine cooling device 100 cools the cooling water heated by the heat of the internal combustion engine 101 by the radiator 2 or recovers heat from the heated cooling water using the heater core 3 or the like. The cooling water is an example of a fluid that flows in the internal combustion engine 101.

  Referring to FIG. 1, an internal combustion engine cooling apparatus 100 includes an electric water pump (electric W / P) 1, a radiator 2, a heater core 3, an oil cooler 4, a thermostat 5, and an FSV (Flow Shutting Valve) 6. Prepare. The internal combustion engine cooling apparatus 100 is controlled by an ECU (Engine Control Unit) 7 that controls the rotational speed of the internal combustion engine 101 and the like. The FSV 6 is an example of a solenoid valve. The internal combustion engine 101 is provided with a water temperature sensor 8 that acquires the temperature of the cooling water.

  The internal combustion engine cooling device 100 includes a cooling water circulation passage 9 that is a passage through which cooling water that is a fluid flowing in the internal combustion engine 101 flows. The cooling water circulation channel 9 includes cooling water channels 9a, 9b and 9c.

  An internal combustion engine 101, an electric W / P1, a radiator 2, and a thermostat 5 are disposed in the cooling water flow path 9a. The electric W / P 1 is arranged on the upstream side of the internal combustion engine 101, and the radiator 2 is arranged on the downstream side of the internal combustion engine 101. The thermostat 5 is disposed on the downstream side of the radiator 2. The cooling water flow path 9 a causes the cooling water to flow through the internal combustion engine 101 via the radiator 2. In the present embodiment, “upstream side” and “downstream side” mean the upstream side and the downstream side in the flow direction of the cooling water indicated by the arrows drawn in the flow path shown in FIG.

  The cooling water passages 9b and 9c branch off at the branch point 10a on the downstream side of the internal combustion engine 101 in the cooling water passage 9a and on the upstream side of the radiator 2, and downstream of the thermostat 5 in the cooling water passage 9a. These are joined together at a junction 10b on the upstream side of the electric W / P1. The cooling water channel 9b and the cooling water channel 9c are provided in parallel.

  The heater core 3 and the FSV 6 are disposed in the cooling water flow path 9b. The cooling water channel 9 b can join the cooling water channel 9 a at the junction 10 b without passing through the radiator 2, and can distribute the cooling water to the internal combustion engine 101. The heater core 3 is arranged on the branch point 10a side, and the FSV 6 is arranged on the junction point 10b side.

  An oil cooler 4 is disposed in the cooling water passage 9c. The cooling water passage 9c can join the cooling water passage 9a at the joining point 10b without passing through the radiator 2, and can flow the cooling water to the internal combustion engine 101.

  The electric W / P1 is an electric type, and the flow rate of the cooling water discharged is controlled based on the control of the ECU 7. Further, the electric W / P1 sucks cooling water from the side opposite to the internal combustion engine 101 in the cooling water flow path 9a and discharges the cooling water toward the internal combustion engine 101 side. The electric W / P1 is a centrifugal pump excellent in discharge efficiency.

  The electric W / P1, which is a centrifugal pump, includes a brushless sensorless motor for rotating an impeller (not shown). As a result, the electric W / P1 can be driven independently of the internal combustion engine 101. The electric W / P1 transmits the rotation speed (the rotation speed of the impeller) to the ECU 7 as pump rotation speed information.

  In the radiator 2, heat exchange is performed between the cooling water flowing through the radiator 2 and the traveling air (air). Thereby, the cooling water which distribute | circulates the radiator 2 is cooled.

  The heater core 3 is blown by a fan (not shown) based on a signal from the ECU 7 when a heating operation is performed in a vehicle (not shown). As a result, heat is exchanged between the cooling water flowing through the heater core 3 (cooling water flow path 9b) and the wind (air), the cooling water is cooled, and warm air is supplied into the vehicle. Is heated.

  In the oil cooler 4, heat exchange is performed between cooling water flowing through the oil cooler 4 (cooling water flow path 9 c) and oil used for lubricating a sliding portion (not shown) of the internal combustion engine 101. The cooling water is warmed and the oil is cooled.

  The opening degree of the thermostat 5 changes based on the temperature of the cooling water. Thus, the thermostat 5 has a function of switching whether or not to flow the cooling water to the radiator 2 of the cooling water flow path 9a and a function of adjusting the flow rate of the cooling water when the cooling water is circulated through the radiator 2. When the temperature of the cooling water flowing through the thermostat 5 is lower than the first temperature (= about 80 ° C.), the thermostat 5 of the present embodiment is completely closed (opening becomes 0%). The cooling water is not circulated through the radiator 2 of the cooling water passage 9a. At this time, the cooling water flows (circulates) from the branch point 10a through the cooling water flow path 9b (in the FSV valve open state) and the cooling water flow path 9c, and returns to the electric W / P1 again from the junction 10b. In the radiator 2, the cooling water is not cooled. Further, when the temperature of the cooling water is equal to or higher than the first temperature, the thermostat 5 adjusts the flow rate of the cooling water flowing through the thermostat 5 based on the opening degree that changes according to the temperature of the cooling water. At this time, the cooling water whose flow rate is adjusted according to the opening degree flows through the radiator 2 of the cooling water passage 9 a, and a part of the cooling water is cooled in the radiator 2. Further, the remaining cooling water flows (circulates) through the cooling water flow path 9b (in the FSV valve open state) and the cooling water flow path 9c so as to return to the electric W / P1 again from the junction 10b. Further, the thermostat 5 is completely opened (the opening degree is 100%) when the temperature of the cooling water is equal to or higher than the second temperature. At this time, the cooling water flows (circulates) through the cooling water flow path 9a, the cooling water flow path 9b (in the case of the FSV valve opening state), and the cooling water flow path 9c to return to the electric W / P1 again. Is cooled in the radiator 2.

  As a result, in the internal combustion engine cooling apparatus 100, the flow path of the cooling water and the flow rate of each flow path change according to the valve opening state of the thermostat 5, so the internal combustion engine cooling apparatus changes according to the opening of the thermostat 5. The resistance (water resistance) of the cooling water flowing through 100 (cooling water circulation passage 9) changes.

  The FSV 6 is a valve member that is opened and closed by a suction force generated by energization. By closing the valve, the flow of the cooling water in the cooling water passage 9b can be blocked. Here, the FSV 6 will be described in detail with reference to FIGS. 2 (A) and 2 (B). The FSV 6 includes a cylindrical housing 6a, and a valve body 6b, a valve seat 6c, a biasing member 6d, and a solenoid 6e, which are disposed in the housing 6a. The housing 6a has an inflow path 61 through which cooling water flows from the heater core 3 side, and an outflow path 62 through which cooling water flows out to the electric W / P1 side. The valve body 6b controls the flow state of the cooling water according to its open / closed state.

  The solenoid 6e is composed of an annular member, and has a body composed of a magnetic body, a bobbin disposed inside the body, and a winding that is wound around the bobbin and generates a magnetic field by energization. An inflow path 61 is formed inside the solenoid 6e, and a downstream end is a valve seat 6c that contacts the valve body 6b.

  The valve body 6b is formed of a magnetic material such as iron. Thereby, when the coil of the solenoid 6e is energized and the solenoid 6e is excited, the valve closing direction, that is, the valve body 6b is electrically attracted toward the valve seat 6c. The urging member 6d is a coil spring, and is disposed in the housing 6a in a state where the valve body 6b is urged in the valve closing direction.

  The FSV 6 is in a valve-closed state by the valve body 6b moving in the valve-closing direction and contacting the valve seat 6c by the urging force of the urging member 6d and the suction force of the energized solenoid 6e. Further, the force applied to the valve body 6b in the valve opening direction based on the pressure of the cooling water in the inflow path 61 and the pressure of the cooling water in the outflow path 62 exceeded the urging force with the energization of the solenoid 6e released. In this case, the valve body 6b moves in the valve opening direction. Thereby, FSV6 switches from a valve closing state to a valve opening state. However, when the FSV 6 shifts from the closed state to the open state, residual magnetic force or surface tension may be applied to the valve body 6b, and the valve body 6b may be difficult to move. is there.

  Here, with reference to FIGS. 3 to 8, the mounting of the FSV 6 to the internal combustion engine 101 will be described. FIG. 3 is a front view of the internal combustion engine 101 of the embodiment, and FIG. 4 is a side view of the internal combustion engine 101 of the embodiment. In the following description, the left-right direction of the internal combustion engine 101 is the direction shown in FIG. 3, the front-rear direction of the internal combustion engine 101 is the direction shown in FIG. 4, and the vertical direction of the internal combustion engine 101 is shown in FIGS. The direction. Since the arrangement of the cylinders in the internal combustion engine 101 of this embodiment is in series, the vertical direction of the internal combustion engine 101 coincides with the sliding direction of the piston. In the present embodiment, by devising the mounting state of the FSV 6 to the internal combustion engine 101, the valve body 6b that is difficult to move when the FSV 6 shifts from the valve-closed state to the valve-open state is immediately desired. State.

  Referring to FIGS. 3 and 4, the internal combustion engine 101 includes a cylinder block 102. A cylinder head 103 is provided on the upper side of the cylinder block 102. A crankcase 104 in which an oil pan is integrated is provided below the cylinder block 102. A cam cover 105 is mounted on the upper side of the cylinder head 103, and a pump case 106 is installed on the cam cover 105. A fuel pump 107 is mounted on the pump case 106. Further, the FSV 6 is attached to the front end side wall of the internal combustion engine 101 via the attachment member 20.

  Referring to FIGS. 5 to 7, the attachment member 20 includes a first bracket portion 21 and a second bracket portion 26. Each of the first bracket portion 21 and the second bracket portion 26 is made of metal, and is formed by bending a plate-like member, and is integrated by brazing the plate members. .

  The first bracket portion 21 includes a first arm portion 22 and a second arm portion 24 formed by bending both sides of a plate-like pedestal portion 21a. The second bracket portion 26 is brazed to the pedestal portion 21a. The first bracket portion 21 can exhibit elasticity and can vibrate in a predetermined frequency range.

  The front end side of the first arm-like portion 22 is further bent, and a contact portion 23 for attaching to the front end side wall of the internal combustion engine 101 is formed. The contact portion 23 of the present embodiment is provided so as to contact the outer wall of the pump case 106. A hook-shaped portion 23 a is provided at the tip of the contact portion 23. The hook-shaped portion 23 a is used to latch on the upper edge of the outer wall of the pump case 106. The contact portion 23 is provided with a bolt hole 23b. The bolt hole 23 b is used when the first arm portion 22 is fixed to the pump case 106.

  The distal end side of the second arm-shaped portion 24 is further bent, and an abutting portion 25 for attaching to the front end side wall of the internal combustion engine 101 is formed. The contact portion 25 of the present embodiment is provided so as to contact the outer wall of the cylinder head 103. The contact portion 25 is provided with a bolt hole 25a. The bolt hole 25 a is used when the second arm-shaped portion 24 is fixed to the cylinder head 103.

  The second bracket part 26 is provided with a clamp part 27. The FSV 6 is held by being clamped by the clamp portion 27 and being clamped by the bolt 28.

  The FSV 6 held by the clamp portion 27 is attached to the internal combustion engine 101 such that the inflow path 61 is located on the lower side and the outflow path 62 is located on the upper side. That is, the FSV 6 is attached to the internal combustion engine 101 so that the opening / closing direction of the valve body 6 b matches the vertical direction of the internal combustion engine 101. In the present embodiment, since the vertical direction of the internal combustion engine 101 matches the sliding direction of the piston, the FSV 6 is in a state where the opening / closing direction of the valve body 6b matches the piston sliding direction of the internal combustion engine 101. It is attached to the internal combustion engine 101. In addition, although the hose is each attached to the inflow path 61 and the outflow path 62, the hose is abbreviate | omitted in each figure.

  When the FSV 6 is mounted on the internal combustion engine 101, the FSV 6 is separated from the internal combustion engine 101 by a predetermined distance. Specifically, as shown in FIG. 5, the FSV 6 is attached to the internal combustion engine 101 such that the distance from the contact portion 23 to the center of gravity C of the FSV 6 is S.

  Here, the setting direction of the FSV 6 and the setting of the distance S from the contact portion 23 to the center of gravity C of the FSV 6 will be described with reference to FIGS. 8 (A) to 8 (C). FIG. 8A shows an example of the vertical vibration of the internal combustion engine 101. According to FIG. 8A, it can be seen that the vibration in the vertical direction of the internal combustion engine 101, that is, the vibration in the piston sliding direction becomes large in a certain frequency range. On the other hand, referring to FIG. 8B, in the left-right direction of the internal combustion engine 101, a frequency region in which vibration is particularly large is not recognized. In addition, referring to FIG. 8C, a frequency region in which vibration is particularly large is not recognized even in the front-rear direction of the internal combustion engine 101.

  The internal combustion engine 101 of this embodiment matches the opening / closing direction of the valve body 6b with the piston sliding direction of the internal combustion engine 101 so that the vibration of the piston sliding direction can be used for the operation of the valve body 6b of the FSV 6. In this state, the FSV 6 is held.

  The internal combustion engine 101 of the present embodiment has the FSV 6 attached to the internal combustion engine 101 in a state in which the opening / closing direction of the valve body 6b matches the piston sliding direction of the internal combustion engine 101, and the valve body is caused by vertical vibration of the internal combustion engine 101. Assist the movement of 6b. Here, it is not required that the opening / closing direction of the valve body 6b completely coincides with the piston sliding direction. Even if the opening / closing direction of the valve body 6b is slightly inclined with respect to the piston sliding direction, it is sufficient that the vibration of the internal combustion engine 101 can be used for the movement of the valve body 6b.

  The distance S from the contact portion 23 to the gravity center position C of the FSV 6 is set in consideration of the frequency range in which the vertical vibration of the internal combustion engine 101 increases. That is, the distance S is set so that the FSV 6 can vibrate in synchronism with a frequency range in which the vertical vibration of the internal combustion engine 101 increases, and based on this, the first arm portion 22 and the second arm portion A length of 24 is set. Since the vibration characteristics of the first arm-shaped portion 22 and the second arm-shaped portion 24 are affected by the material, thickness, mounting position, and the like, the distance S corresponding to them is set.

  The FSV 6 of the present embodiment can immediately bring the valve body 6b to a desired state by using the vertical vibration of the internal combustion engine 101. Specifically, referring to FIG. 9, when a valve opening command is issued from a state in which the valve body is fully closed, the energization to the FSV 6 is cut off. And if the vibration G acts, the valve body 6b will move the position to the valve opening direction step by step for every period of the vibration G, and valve opening will be completed finally.

  The FSV 6 of the present embodiment closes the valve body 6b by the suction force generated by energizing the solenoid 6e and the urging force of the urging member 6d. On the other hand, when opening the valve body 6b, the energization to the solenoid 6e is released. Thereby, since the suction force of the solenoid 6e disappears, the valve body 6b is pushed open by the cooling water flowing into the inflow path 61, and the valve body 6b is opened. Even when the energization of the solenoid 6e is released, a residual magnetic force may be generated. Moreover, the surface tension of the cooling water may act on the valve body 6b. In such a case, if the amount of cooling water flowing from the inflow path 61 is small, it may be difficult to push the valve body 6b open. However, by installing the FSV 6 as in the present embodiment, the vibration in the vertical direction of the internal combustion engine 101 (the sliding direction of the piston) acts on the FSV 6 to assist the movement of the valve body 6b. The valve is immediately opened.

  In the present embodiment, the first arm 22 is attached to the pump case 6 and the second arm 24 is attached to the cylinder head 103, but these attachment positions are examples. The location where the FSV 6 is attached to the internal combustion engine 101 by the mounting member 20 may be anywhere as long as the vertical vibration of the internal combustion engine 101 can be used.

  Further, the mounting member 20 of the present embodiment is not only when the valve is closed by energization, and when the valve is opened by energization release, but also when the valve is opened by energization and the valve is closed by deenergization. Is also effective.

  Further, oil also flows in the internal combustion engine 101, and when an electromagnetic valve is installed in the oil flow path, as in the above embodiment, the vertical vibration of the internal combustion engine 101 is reduced by the electromagnetic valve. It can be set as the form used for assistance of a valve body movement. In other words, the electromagnetic valve installed in the oil flow path is installed in the internal combustion engine 101 in a state where the valve body is separated from the internal combustion engine 101 by a predetermined distance and the opening / closing direction of the valve body is made coincident with the piston sliding direction of the internal combustion engine 101. You may make it do.

  Even when the internal combustion engine is a so-called V type, the FSV 6 is arranged in a state in which the opening and closing direction of the valve body 6b is made to coincide with the piston sliding direction of the internal combustion engine. In this case, the FSV 6 , Tilted according to the bank angle.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited to these. Various modifications of these embodiments are within the scope of the present invention, and It is apparent from the above description that various other embodiments are possible within the scope.

6 FSV
6b Valve body 9 Cooling water circulation path 20 Mounting member 21 First bracket portion 22 First arm portion 24 Second arm portion 26 Second bracket portion 100 Internal combustion engine cooling device 101 Internal combustion engine 103 Cylinder head 105 Cam cover 106 Pump case

Claims (1)

An electromagnetic valve provided in a flow path through which the fluid flowing in the internal combustion engine flows, and having a valve body that controls the flow state of the fluid;
An attachment member for fixing the electromagnetic valve to the internal combustion engine,
The mounting member separates the electromagnetic valve from the internal combustion engine by a predetermined distance, and holds the electromagnetic valve in a state where the opening / closing direction of the valve body matches the piston sliding direction of the internal combustion engine. .

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