Heating shutoff valve installation structure

Abstract

To provide a heating shutoff valve installation structure capable of reducing a manufacturing cost associated with a cooling system of an internal combustion engine.SOLUTION: An installation structure of a heating shutoff valve 6 allows a heating shutoff valve 6 to be directly attached to a valve connection section 21 integrally provided with an outlet 2. Therefore, no installation member, such as a bracket, is required during the installation of the heating shutoff valve 6. As the result, a manufacturing cost associated with a cooling system of an internal combustion engine, engine 1, can be reduced.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an attachment structure of a shut-off valve for heating.

Background Art

[0002] As a conventional shut-off valve for heating, for example, the one described in Patent Document 1 below is known.

[0003] Briefly explained, this shut-off valve for heating is an electromagnetic valve arranged between an internal combustion engine and a heat exchanger for heating in a circulation line of cooling water for cooling the internal combustion engine. That is, when the temperature of the cooling water is below a threshold value for promoting warm-up, the shut-off valve for heating is closed to cut off the supply of the cooling water to the heat exchanger for heating, and when the temperature of the cooling water exceeds the threshold value, it opens and the cooling water is used as a heat source for the heat exchanger for heating.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the above cooling system, no consideration has been given to the attachment structure of the conventional shut-off valve for heating. For this reason, for example, when attaching a shut-off valve for heating to a predetermined location such as an internal combustion engine via an attachment member such as a bracket, there is still room for improvement in that the manufacturing cost of the above cooling system increases by the amount of the attachment member such as the bracket.

[0006] Therefore, the present invention has been devised in view of the technical problems of the attachment structure of the conventional shut-off valve for heating, and aims to provide an attachment structure of a shut-off valve for heating that can reduce the manufacturing cost related to the cooling system of an internal combustion engine.

Means for Solving the Problem

[0007] As one aspect of the present invention, there is provided an attachment structure of a heating shut-off valve provided between an internal combustion engine and a heating heat exchanger in a refrigerant circulation line for cooling the internal combustion engine, the heating shut-off valve switching the supply of the refrigerant to the heating heat exchanger. The internal combustion engine is provided with an outlet on a side portion thereof for distributing the refrigerant circulated inside the internal combustion engine to external devices including the heating heat exchanger, and the heating shut-off valve is directly attached to the outlet.

Advantages of the Invention

[0008] According to the present invention, the heating shut-off valve is directly attached to the outlet. Therefore, when attaching the heating shut-off valve to the internal combustion engine, no attachment member such as a bracket is interposed. As a result, it is possible to reduce the manufacturing cost of the cooling system of the internal combustion engine.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0010] Hereinafter, an embodiment of an attachment structure of a heating shut-off valve according to the present invention will be described in detail with reference to the drawings.

[0011] (Configuration of Cooling System) FIG. 1 shows a circuit diagram of a cooling water circulation line constituting a cooling system of an engine 1 to which an attachment structure of a heating shut-off valve 6 according to the present embodiment is applied.

[0012] For example, as shown in FIG. 1, cooling water, which is a refrigerant pumped from a water pump WP, flows through the interior of an engine 1 that is an internal combustion engine, and is distributed to a heater 3, which is a heat exchanger for heating, a throttle chamber 4, a radiator 5, and an EGR cooler 7 via an outlet 2 attached to the side of the engine 1. Then, the cooling water supplied to the heater 3, the throttle chamber 4, the radiator 5, and the EGR cooler 7 then converges via an inlet 8 attached to the engine 1 and is refluxed to the engine 1.

[0013] Also, a heating shut-off valve 6, which is a so-called flow shut-off valve but valve, is disposed between the outlet 2 and the heater 3, and by means of the heating shut-off valve 6, it is possible to shut off the supply of cooling water to the heater 3 side, for example, at the time of cold start. The heating shut-off valve 6 is directly connected to the outlet 2 and is connected to the heater 3 via a heater hose H1. An EGR cooler 7 is disposed on the downstream side of the heater 3, and the cooling water that has passed through the heater 3 is refluxed to the engine 1 via the inlet 8 after passing through the EGR cooler 7.

[0014] Also, a bypass hose H4 is connected to the outlet 2, and it is possible to directly supply the cooling water bypassed from the engine 1 to the EGR cooler 7 via the bypass hose H4. The supply of cooling water to the EGR cooler 7 is controlled by an EGR control valve EV provided in the middle of the bypass hose H4.

[0015] Also, the outlet 2 and the radiator 5 are connected via a radiator hose H3. Further, a thermostat TS is provided between the outlet 2 and the radiator 5, and the cooling water flowing out from the engine 1 is supplied to the radiator 5 side via the thermostat TS. The thermostat TS closes the valve when the cooling water temperature is lower than a predetermined temperature, and the supply of cooling water to the radiator 5 is shut off for promoting warming. On the other hand, the thermostat TS opens the valve when the cooling water temperature is higher than a predetermined temperature, and the cooling water temperature is reduced by the radiator 5.

[0016] Further, the engine 1 is connected to the CVT oil cooler 9 via the oil cooler hose H5. That is, a part of the cooling water flowing through the inside of the engine 1 is supplied to the CVT oil cooler 9 via the oil cooler hose H5 and through a throttle valve TV disposed in the middle of the oil cooler hose H5. Then, the cooling water that has passed through this CVT oil cooler 9 is refluxed to the engine 1 via the inlet 8.

[0017] (Mounting structure of the heating shut-off valve) FIG. 2 shows a perspective view of the engine room ER of the vehicle body 10 to which the mounting structure of the heating shut-off valve according to the present embodiment is applied. FIG. 3 shows a front view of the outlet 2 shown in FIG. 2. In the following description, the heater 3, the throttle chamber 4, the radiator 5, the EGR cooler 7, and the radiator hose H3 and the bypass hose H4 shall be referred to FIG. 1 as appropriate.

[0018] Particularly, as shown in FIG. 2, the outlet 2 is attached to the side portion of the cylinder head 11 provided with an outlet for the cooling water flowing through the inside of the engine 1 via a plurality (four in this embodiment) of outlet mounting bolts B1. The outlet 2 is integrally formed of a metal material such as an aluminum alloy as a whole, and has a plate-like mounting base 20 formed to have a substantially rectangular shape in plan view as shown in FIG. 3. Bolt through-holes 200 through which the respective outlet mounting bolts B1 can be inserted are provided at the respective corners (four corners) of the mounting base 20.

[0019] Further, as shown in FIGS. 2 and 3, the outlet 2 includes a valve connection portion 21 which is an outlet for the heater for taking out the cooling water for the heater to which the heating shut-off valve 6 is directly connected, an outlet 22 for the throttle chamber for taking out the cooling water for the throttle chamber, an outlet 23 for the radiator for taking out the cooling water for the radiator, an outlet 24 for the EGR for taking out the cooling water for the EGR cooler 7, and a sensor connection portion 25 into which the water temperature sensor WT is inserted and which is used for detecting the cooling water temperature.

[0020] The valve connection portion 21 is formed in a cylindrical shape that protrudes substantially vertically with respect to the mounting base 20, and includes a valve housing portion 211 that houses one end portion of the heating shut-off valve 6, and a pair of attached flange portions 212 that are provided on the outer peripheral side of the valve housing portion 211 with the valve housing portion 211 interposed therebetween and to which the heating shut-off valve 6 is fixed. Further, on the outer end surfaces of the valve housing portion 211 and the pair of attached flange portions 212, a valve mounting surface 213 on which the mounting flange portion 60 provided on the heating shut-off valve 6 seats is formed. The valve mounting surface 213 is formed by a series of flat surfaces that are continuous without a step on the outer end surfaces of the valve housing portion 211 and the pair of attached flange portions 212, and the mounting flange portion 60 of the heating shut-off valve 6 can be in close contact therewith.

[0021] Further, in each of the pair of attached flange portions 212, female screw portions 214 are formed into which a plurality (two in this embodiment) of valve mounting bolts B2 inserted through bolt through holes 600 penetrating the mounting flange portion 60 of the heating shut-off valve 6 are respectively screwed. In this way, the heating shut-off valve 6 is directly connected to the valve connection portion 21 (valve mounting surface 213) of the outlet 2 via the mounting flange portion 60 and is directly fixed to the pair of attached flange portions 212 via the respective valve mounting bolts B2.

[0022] One end portion of a heater hose H1 is connected to the other end portion of the heating shut-off valve 6, and the other end portion of the heater hose H1 is connected to, for example, a cylindrical heater joint 30 attached to the bulkhead 100 of the vehicle body 10 and facing from the passenger compartment into the engine room ER. The heater joint 30 is connected to a heater 3 disposed in the passenger compartment. That is, the heating shut-off valve 6 and the heater 3 are connected via the heater hose H1. In other words, by directly connecting the heating shut-off valve 6 to the outlet 2, a relatively long hose length of the heater hose H1 connecting the heating shut-off valve 6 and the heater joint 30 is ensured.

[0023] The outlet 22 for the throttle chamber is formed in a cylindrical shape extending upward from the mounting base 20, and a throttle chamber hose H2 made of, for example, rubber is connected to the outlet 22 for the throttle chamber. That is, the throttle chamber 4 provided in the engine 1 and the outlet 2 are connected via the throttle chamber hose H2.

[0024] The outlet 23 for the radiator is formed in a cylindrical shape protruding substantially perpendicular to the mounting base 20 and extending laterally of the engine 1, and a radiator hose H3 made of, for example, rubber is connected to the outlet 23 for the radiator. That is, the outlet 2 and the radiator 5 are connected via the radiator hose H3.

[0025] The outlet 24 for EGR is formed in a cylindrical shape extending upward from the mounting base 20, and is connected to, for example, a bypass hose H4 made of rubber at the outlet 24 for EGR. The bypass hose H4 is connected to an EGR control valve EV provided in the engine 1, and the outlet 2 and the EGR cooler 7 are bypass-connected via the EGR control valve EV.

[0026] (Operational effects of this embodiment) In the prior art, no consideration is given to the mounting structure of the heating shut-off valve. For this reason, when the heating shut-off valve 6 is mounted at a predetermined location such as the engine 1 via a mounting member such as a bracket, there is still room for improvement in that the manufacturing cost of the cooling system increases by the amount of the mounting member such as the bracket.

[0027] Further, in the prior art, the heating shut-off valve 6 was disposed at an intermediate position between the outlet 2 and the heater joint 30, and the heating shut-off valve 6 may have been fixed to the engine 1 via a bracket. In this case, the distance from the heating shut-off valve 6 to the heater joint 30 became relatively short, and the hose length of the heater hose H1 became relatively short. For this reason, the vibration of the engine 1 transmitted to the heating shut-off valve 6 via the mounting member such as the bracket was not sufficiently attenuated by the elasticity of the heater hose H1, and there was still room for improvement in that the vibration of the engine 1 was transmitted to the vehicle body 10.

[0028] On the other hand, in the mounting structure of the heating shut-off valve 6 according to the present embodiment, the heating shut-off valve 6 is directly mounted on the valve connection portion 21 provided integrally with the outlet 2. For this reason, when mounting the heating shut-off valve 6 to the engine 1, no mounting member such as the bracket is interposed. Thereby, the manufacturing cost related to the cooling system of the engine 1 can be reduced.

[0029] Furthermore, since the heating shut-off valve 6 is directly mounted on the outlet 2 attached to the engine 1, the degree of freedom in the routing (layout) of the heater hose H1 is improved, and since it is not necessary to divide the heater hose H1 before and after the heating shut-off valve 6, the connection work of the heater hose H1 can be performed relatively easily.

[0030] Further, in the present embodiment, as described above, the heating shut-off valve 6 is directly connected to the outlet 2 attached to the engine 1, and the heating shut-off valve 6 is connected to a heater joint 30 provided on the bulkhead 11 of the vehicle body 10 via an elastic heater hose H1. The heater 3 disposed in the passenger compartment separated by the bulkhead 11 of the vehicle body 10 is connected via the heater joint 30. As a result, compared with the case where the heating shut-off valve 6 is disposed at an intermediate position between the outlet 2 and the heater joint 30 attached to the vehicle body 10, it is possible to ensure a longer hose length of the heater hose H1 connecting the heating shut-off valve 6 and the heater joint 30. As a result, the vibration of the engine 1 transmitted from the engine 1 to the vehicle body 10 side through the heating shut-off valve 6 is effectively attenuated based on the elasticity of the heater hose H1 with a longer hose length ensured, and the transmission of the vibration of the engine 1 to the vehicle body 10 can be effectively suppressed.

[0031] Further, in the present embodiment, the heating shut-off valve 6 is configured to be fastened to a female screw portion 214 formed on a mounting flange portion 212 of the metal outlet 2 by a valve mounting bolt B2. Therefore, the risk of breakage is reduced compared with the resin outlet 2, and the heating shut-off valve 6 can be fixed more firmly. For example, the durability against the temperature and vibration of the engine 1 can be improved.

[0032] The present invention is not limited to the configuration exemplified in the above embodiment, and can be freely changed according to, for example, the specifications of the engine 1 and the heating shut-off valve 6 to which the present invention is applied.

[0033] In particular, the external device associated with the outlet 2 illustrated in the above embodiment is merely an example. The outlet 2 does not necessarily need to be associated with a plurality of external devices, and it suffices to be associated with at least the heater 3. In other words, the outlet 2 only needs to be provided with a valve connection portion 21 that can directly connect at least the heating shut-off valve 6. On the other hand, the outlet 2 can be associated with any external device including the heater 3, and the external devices to be associated are not limited to the throttle chamber 4, the radiator 5, and the EGR cooler 7, and can be arbitrarily changed according to the specifications of the engine 1 and the like.

Description of Reference Numerals

[0034] 1…Engine (Internal Combustion Engine) 2…Outlet 20…Mounting Base 21…Valve Connection Portion 211…Valve Accommodation Portion 212…Flange Portion to be Mounted 213…Valve Mounting Surface 214…Female Thread Portion 22…Outlet for Throttle Chamber 23…Outlet for Radiator 24…Outlet for EGR 3…Heater (Heating Heat Exchanger) 30…Heater Joint 4…Throttle Chamber 5…Radiator 6…Heating Shut-off Valve 60…Mounting Flange Portion 600…Bolt Through-hole 7…EGR Cooler 8…Inlet 9…CVT Oil Cooler 10…Vehicle Body 100…Bulkhead B1…Outlet Mounting Bolt B2…Valve Mounting Bolt

Claims

1. An attachment structure of a heating shut-off valve provided between an internal combustion engine and a heating heat exchanger in a refrigerant circulation line for cooling the internal combustion engine, for switching the supply of the refrigerant to the heating heat exchanger, The internal combustion engine has an outlet attached to a side portion of the internal combustion engine for distributing the refrigerant circulated inside the internal combustion engine to external devices including the heating heat exchanger, The heating shut-off valve is directly attached to the outlet, An attachment structure of a heating shut-off valve, characterized in that.

2. The attachment structure of the heating shut-off valve according to claim 1, The heating shut-off valve is connected to a heater joint provided on the vehicle body via an elastic hose, and is connected to the heating heat exchanger disposed in the vehicle interior of the vehicle body via the heater joint, An attachment structure of a heating shut-off valve, characterized in that.

3. The attachment structure of the heating shut-off valve according to claim 1 or 2, The outlet is formed of a metal material and has a valve mounting surface to which the heating shut-off valve is attached, The heating shut-off valve has a mounting flange portion that seats on the valve mounting surface, The mounting flange portion is provided with bolt through holes through which bolts pass, The valve mounting surface is formed with female screw portions into which the bolts inserted through the bolt through holes are screwed, An attachment structure of a heating shut-off valve, characterized in that.

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