JP2020193592A - Heater core device for engine - Google Patents

Abstract

To secure high waterproofness of a harness coupler part of a heater shut valve.SOLUTION: A heater shut valve 28 is fitted to a portion in the middle of a heater cooling water return passage 23B constituting a heater cooling water passage 23, and the heater cooling water return passage 23B communicates a cooling water outlet 25 of a heater core and a heater cooling water return port 26 of an engine body with each other. A bottom part 29a of a surge tank 29 is disposed between the cooling water outlet 25 and the heater cooling water return port 26 in the vehicle vertical direction, and a branch pipe 30 is coupled to an upper part of the surge tank 29. The heater shut valve 28 is disposed adjacent to the bottom part 29a of the surge tank 29.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heater core device for an engine including a heater shut valve.

Conventionally, for example, in Patent Document 1, a main cooling water path in which engine cooling water flowing out of an engine returns to the engine via a radiator and a main cooling water path provided in parallel with the main cooling water path are provided in parallel with the engine cooling water to provide a heater core of an air conditioner. A sub-cooling water path that returns to the engine via the sub-cooling water path and a valve that controls the flow of engine cooling water in the sub-cooling water path are described.

JP-A-2002-235544

However, Patent Document 1 does not disclose the arrangement of the heater shut valve that restricts the flow of cooling water. Depending on the arrangement of the heater shut valve, the heater shut valve may be flooded by rainwater falling from above, and the harness coupler portion of the heater shut valve may be flooded as it is.

The present invention has been made in view of such circumstances, and an object of the present invention is to guarantee high waterproofness around the harness coupler portion of the heater shut valve.

The heater core device of the present invention includes a cooling device for circulating cooling water between an engine body having a plurality of cylinders arranged in the vehicle width direction and a radiator, a surge tank extending in the cylinder row direction, the surge tank, and each of the above. It has a plurality of branch pipes connecting the cylinders, and is connected to the engine body by a heater cooling water passage that circulates cooling water between the intake manifold connected to the rear part of the engine body and the engine body. In an engine including a heater core device including a heater core and a heater shut valve that shuts off the flow of cooling water to the heater core by electric power supplied from a coupler portion, the heater that constitutes the cooling water passage for the heater. The heater shut valve is mounted in the middle of the cooling water return passage, and the heater cooling water return passage connects the cooling water outlet of the heater core and the heater cooling water return port of the engine body, and the surge tank is The bottom of the vehicle is arranged between the cooling water outlet and the heater cooling water return port in the vertical direction of the vehicle, while the branch pipe is connected to the upper part of the surge tank, and the heater shut valve is connected to the surge. It is characterized by being arranged so as to be close to the bottom of the tank.

According to the present invention, it is possible to prevent water from entering the coupler portion of the heater shut valve and guarantee high waterproofness.

It is a left side view around an engine mounted on a vehicle as an application example of this invention. It is an enlarged view of the main part of FIG. It is a right side view around an engine mounted on a vehicle as an application example of this invention. It is an enlarged view of the main part of FIG. It is a right rear perspective view around an engine mounted on a vehicle as an application example of this invention. It is an enlarged view of the main part of FIG. It is a rear front view around an engine mounted on a vehicle as an application example of this invention. It is a block diagram of the cooling circuit which shows the flow of the cooling water in the engine mounted on the vehicle as the application example of this invention.

Hereinafter, preferred embodiments of the engine heater core device according to the present invention will be described with reference to the drawings.
The heater core device of the engine of the present invention according to the embodiment of the present invention includes a cooling device for circulating cooling water between an engine body having a plurality of cylinders arranged in the vehicle width direction and a radiator, and a cylinder row direction. It has a surge tank extending to, and a plurality of branch pipes connecting the surge tank and each of the cylinders, and circulates cooling water between the intake manifold connected to the rear part of the engine body and the engine body. In an engine including a heater core connected to the engine body by a heater cooling water passage and a heater core device including a heater shut valve that shuts off the flow of cooling water to the heater core by electric power supplied from a coupler portion. The heater shut valve is mounted in the middle of the heater cooling water return passage constituting the heater cooling water passage, and the heater cooling water return passage is provided with the cooling water outlet of the heater core and the heater cooling water of the engine body. The surge tank communicates between the return ports, and the bottom of the surge tank is arranged between the cooling water outlet and the cooling water return port for the heater in the vertical direction of the vehicle, while the branch pipe is located above the surge tank. Connected, the heater shut valve is placed close to the bottom of the surge tank.

In the heater core device of the engine according to the present invention, the cooling water return passage for the heater is arranged at a position close to the bottom of the surge tank, and the heater shut valve is placed at the bottom of the surge tank in the middle of the cooling water return passage for the heater. Arrange them so that they are close to each other. This makes it possible to prevent the heater shut valve from being flooded by a liquid such as rainwater dripping from above the heater shut valve.

The vehicle may be, for example, a passenger car or the like. In FIG. 1, an engine room 2 is provided in front of the vehicle 1, and an engine 10 is mounted in the engine room 2. First, a schematic configuration of the engine 10 according to this embodiment will be described. In the drawings used in the following description including FIG. 1, the direction seen from the driver's seat of the vehicle 1 is the front of the vehicle, and the opposite direction is the rear. In addition, the right side is the right side and the left side is the left side, and these directions are indicated by arrows as necessary. Here, FIG. 1 is a left side view of the entire engine 10, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a right side view of the entire engine 10, and FIG. 4 is an enlarged view of a main part of FIG. 5 is a right rear perspective view of the entire engine 10, and FIG. 6 is an enlarged view of a main part of FIG.

The vehicle 1 has a dash panel 3 provided at the rear of the engine room 2, left and right body frames (not shown) arranged on the side of the engine room 2 and extending in the front-rear direction. In the following description, parts or members will be omitted as necessary. The dash panel 3 partitions the engine room 2 and the vehicle interior 4 of the vehicle 1, and the vehicle body frame forms the skeleton structure of the vehicle body. The engine 10 is supported at a predetermined position in the engine room 2 via an engine mount. An engine hood can be opened and closed in the upper part of the engine room 2, and a front grill or the like is attached to the front part of the engine room 2.

In this embodiment, the engine 10 may be, for example, a multi-cylinder engine, typically a 4-cylinder engine or the like. In this case, for example, the 1st (# 1) cylinder to the 4th (# 4) cylinder are arranged in a straight line (in series) in the left-right direction, and the cylinder axis of each cylinder points in a substantially vertical direction. A transmission (not shown) is integrally connected to the left side of the crankcase 11 of the engine 10, and all of them are supported by the vehicle body frame via the engine mount on the right side of the engine 10 and the left side of the transmission. ..

In the engine 10, as shown in FIG. 3, a cylinder block 12 is integrally formed with the crankcase 11 on the upper part of the crankcase 11. The cylinder head 13 and the cylinder head cover 14 are sequentially integrally coupled to the upper portion of the cylinder block 12 to form an in-line 4-cylinder engine as described above, which substantially becomes the engine body. As a valve operating device, for example, a cam timing chain for driving the camshaft of the valve operating mechanism is arranged on the right side surface of the cylinder block 12 and the cylinder head 13, and the chain cover 15 is the camshaft and cam timing of the valve operating mechanism. It covers the chain from the right side.

Further, the engine 10 includes an intake device for supplying air supplied from an air cleaner, a fuel supply device for supplying fuel, an exhaust device for discharging exhaust gas after combustion from the engine 10, a cooling device for cooling the engine 10, and an engine 10. A lubrication device that lubricates the moving parts of the engine, and a control device (ECU; Engine Control Unit) that controls the operation of these are attached. By controlling the control device, a plurality of devices cooperate with the above-mentioned accessories and the like, whereby smooth operation of the engine 10 as a whole is performed.

In the intake device, intake ports are opened on the rear side of the cylinder head 13 for both # 1 to # 4 cylinders, and the intake manifold 16 connected to those intake ports is the engine 10 as shown in FIGS. 3, 4, 5, and the like. Is connected to. Combustion air is supplied from the rear side of the engine 10 via the intake manifold 16. An air cleaner is arranged near the front left side of the engine 10, for example, and the air taken in from the air inlet pipe in the air cleaner is sent to the air cleaner case. An air filter is installed in the air cleaner case, and the air taken into the air cleaner case is cleaned by the air filter. The air cleaned by the air cleaner is supplied to the intake manifold 16 via the throttle body.

In this embodiment, the intake device may include a supercharger (turbocharger) that compresses the air supplied to the engine 10 in the middle of the air supply path leading to the intake manifold 16. In this case, the turbocharger is arranged on the front side of the cylinder head 13 and has a turbine rotated by the flow of exhaust gas and a compressor arranged coaxially with the rotation axis of the turbine. The air sent from the air cleaner is taken in by the compressor driven by the turbine, and the air compressed by the compressor is sent to the intake manifold 16 side.

If a supercharger is provided, an intake intercooler may be provided along with the supercharger. Since the air compressed by the compressor of the supercharger becomes hot, it causes a decrease in the intake efficiency for the engine 10 as it is. Therefore, the intake efficiency can be effectively improved by connecting an intercooler in the middle of the intake passage from the supercharger to the intake manifold 16 and cooling the air supplied from the supercharger by the intercooler.

In the exhaust device, an exhaust port is opened on the front side of the cylinder head 13 for both the # 1 cylinder to the # 4 cylinder, and the above-mentioned supercharger is connected to this exhaust port. An exhaust pipe from which the exhaust gas after rotating the turbine is discharged is connected to the turbine of the supercharger. The exhaust pipe extends downward from the supercharger, wraps around the lower part of the engine 10, and further extends rearward.

Next, in the cooling device of the engine 10, a water jacket (not shown) formed so as to circulate cooling water is configured inside the cylinder block 12 and the cylinder head 13. As shown in FIGS. 1 and 3, a radiator 17 for cooling the cooling water sent to the water jacket is provided. In this embodiment, the radiator 17 has a rectangular shape in a front view, is arranged in front of the engine 10 away from the engine 10 as shown in FIG. 1 or 3, and a reservoir tank 18 is located near the right side of the cylinder head 13 of the engine 10. Is placed. The pipe connected to the cylinder head 13 is connected to the reservoir tank 18 via a supercharger. The radiator 17 is supported at an appropriate position by using a vehicle body frame or the like. In this case, the intercooler may be arranged on the front side of the radiator 17, and the intercooler outlet hose may be arranged on the back side (rear side) of the radiator 17.

The engine 10 includes a water pump 19 for circulating cooling water in the cooling system. As shown in FIG. 5 and the like, the water pump 19 is arranged on the rear side of the right end portion of the cylinder block 12, and supplies the cooling water cooled by the radiator 17 to the water jacket of the cylinder block 12 and the like. The cooling water discharged from the water pump 19 and flowing through the water jacket of the engine 10 is the cooling water connected to the cooling water outflow portion 20 provided at the left end of the cylinder head 13 as shown in FIGS. 1 and 2. It is sent to the radiator 17 via the hose 21 (upper hose). In each figure, the flow of cooling water is indicated by solid arrows as appropriate. The cooling water cooled by the radiator 17 is returned to the water pump 19 via the cooling water hose 22 (lower hose). As shown in FIG. 8, the engine 10 and the radiator 17 are connected by a cooling water hose 21 and a cooling water hose 22, and cooling water is circulated through the main cooling water passage by a water pump 19.

Further, the cooling device is arranged behind the intake manifold 16 as shown in FIGS. 1 to 4, etc., and is connected to the engine body by a heater cooling water passage 23 for circulating cooling water with the engine body of the engine 10. A heater core device including the heater core 24 to be connected is attached. The heater core 24 is arranged on the vehicle interior 4 side opposite to the engine compartment 2 with the dash panel 3 interposed therebetween, and serves as a heating heat source by circulating cooling water.

As the heater cooling water passage 23, as shown in FIG. 2, the heater cooling water supply passage 23A and the heater cooling water return passage 23B are provided. The cooling water supply passage 23A for the heater is connected to the cooling water outflow portion 20 and extends rearward from the cooling water outflow portion 20. The heater cooling water return passage 23B constitutes a part of the heater cooling water passage 23, and the cooling water outlet 25 of the heater core 24 and the heater cooling water return port 26 of the engine body of the engine 10 (see also FIG. 7). Contact between. The cooling water supply passage 23A for the heater extends rearward from the cooling water outflow portion 20 and is curved in a mountain shape, and then is connected to the cooling water inlet 27 of the dash panel 3. The cooling water flows into the heater core 24 from the cooling water inlet 27 through a cooling water passage (not shown). The cooling water circulating in the heater core 24 is sent to the cooling water outlet 25 via a cooling water passage (not shown), and flows into the cooling water return passage 23B for the heater. The cooling water return passage 23B for the heater extends from the cooling water outlet 25 to the vicinity of the rear end of the intake manifold 16, then bends downward, and further extends to the right as shown in FIG. 7, etc., of the water pump 19. It is connected to the heater cooling water return port 26 set near the left side.

As shown in FIGS. 2, 6, 7, and the like, the heater shut valve 28 is arranged in the middle of the heater cooling water return passage 23B. The heater shut valve 28 is configured to operate a valve that shuts off the flow of cooling water by the electric power supplied from the coupler portion 28a. Here, as shown in FIG. 6 and the like, the intake manifold 16 is a plurality of surge tanks 29 extending in the cylinder row direction of the # 1 to # 4 cylinders, and a plurality of the surge tanks 29 and each cylinder (4 in this example). It has a branch pipe 30 (one). A corresponding branch pipe 30 extends from a single surge tank 29, which generally has a tubular container shape in the intake manifold 16, toward the intake ports of the # 1 cylinder to the # 4 cylinder, respectively. Then, these branch pipes 30 are connected to and fixed to the intake ports of the # 1 to # 4 cylinders that open on the rear side of the cylinder head 13, so that the intake manifold 16 is connected to the rear portion of the engine body.

As shown in FIGS. 2, 7 and the like, the bottom 29a of the surge tank 29 is arranged between the cooling water outlet 25 and the heater cooling water return port 26 in the vertical direction of the vehicle, while the branch pipe 30 has a surge. The upper part of the tank 29 is connected so as to project diagonally upward as shown in FIG.
In the intake manifold 16 including the surge tank 29 and the branch pipe 30, the bottom portion 29a of the surge tank 29 is set to the lowest position in the vertical direction because the branch pipe 30 projects upward.

Further, a part of the heater cooling water return passage 23B is arranged at a position close to the bottom 29a of the surge tank 29, and the heater shut valve 28 returns the cooling water for the heater so as to be close to the bottom 29a of the surge tank 29. It is arranged in the passage 23B.
As described above, the cooling water return passage 23B for the heater extends from the cooling water outlet 25 to the vicinity of the rear end of the surge tank 29 of the intake manifold 16 and then bends downward. However, as shown in FIGS. 2 and 7, the heater A part 23a of the cooling water return passage 23B for cooling water is arranged close to the bottom 29a of the surge tank 29 so as to slip under the bottom 29a. The heater shut valve 28 is arranged in a part 23a of the heater cooling water return passage 23B.

As shown in FIG. 6 and the like, the heater shut valve 28 is fixed to the surge tank 29 at the upper end connected to the surge tank 29 and at the lower end via a bracket 31 extending downward from the bottom 29a of the surge tank 29. To.
As shown in FIG. 4, the bracket 31 is formed of a thin metal plate in a substantially "<" shape, and the upper end and the lower end thereof are formed by bolts 32 at the right rear end of the surge tank 29 and the heater shut valve 28, respectively. It is fastened near the top of the.

Here, the engine 10 adopts an EGR system (Exhaust Gas Recirculation) so that a part of the exhaust gas is recirculated to the intake side. In this case, as shown in FIG. 2 or FIG. 6, the EGR cooler 33 is mounted above the branch pipe 30 on the left side of the intake manifold 16, and the exhaust gas is introduced into the core portion of the EGR cooler 33. In each figure, the flow of exhaust gas is indicated by a dotted arrow as appropriate. As shown in FIG. 6, an EGR passage 34 for introducing the exhaust gas into the surge tank 29 is formed on the upper surface of the intake manifold 16 so as to bulge outward from the upper surface of the intake manifold 16. The amount of exhaust gas introduced into the surge tank 29 is controlled by the EGR valve 35.
As shown in FIG. 6 or 7, the EGR passage 34 is formed so as to cross above the bracket 31.

An EGR cooling water passage 36 (see FIGS. 2, 6 and the like) branched from the heater cooling water supply passage 23A is connected to the EGR cooler 33, and the core portion is cooled by using the cooling water and the exhaust gas thereof is discharged. I try to lower the temperature. The cooling water flowing through the EGR cooler 33 is returned to the cooling water hose 22 via the EGR cooling water passage 36.

When the cooling water of the cooling system reaches a predetermined temperature by starting the engine 10, the water pump 19 operates to circulate the cooling water in the cooling system. The cooling water discharged from the water pump 19 and circulated in the water jacket of the engine 10 is sent from the cylinder head 13 to the radiator 17 via the cooling water hose 21. The cooling water cooled by the radiator 17 is returned to the water pump 19 via the cooling water hose 22. Cooling water is circulated between the engine 10 and the radiator 17, and the engine 10 is cooled. On the other hand, a part of the cooling water is sent from the cooling water outflow portion 20 to the heater core 24 via the cooling water passage 23 for the heater, and at that time, the heater shut valve 28 blocks the flow of the cooling water to the heater core 24 to perform air conditioning. Control the temperature so that it becomes an appropriate temperature.

In particular, in the present invention, the bottom 29a of the surge tank 29 is arranged between the cooling water outlet 25 and the cooling water return port 26 for the heater in the vertical direction of the vehicle, and the branch pipe 30 is connected to the upper part of the surge tank 29. A space for arranging the heater cooling water return passage 23B in a linear path can be secured below the bottom 29a of the surge tank 29.
In this case, the heater cooling water return passage 23B is further arranged at a position close to the bottom 29a of the surge tank 29, and the heater shut valve 28 is placed in the middle of such a heater cooling water return passage 23B of the surge tank 29. Arrange so as to be close to the bottom 29a. As a result, it is possible to prevent the heater shut valve 28 from being flooded by a liquid such as rainwater dripping from above the heater shut valve 28. Therefore, it is possible to prevent the occurrence of water ingress to the coupler portion 28a of the heater shut valve 28 and guarantee the safe operation of the heater core device.

Further, since the bracket 31 for fixing the heater shut valve 28 to the surge tank 29 can be accessed from the rear of the surge tank 29 and fastened with the bolt 32, the assembling property of the heater shut valve 28 is greatly improved. Is possible.

Further, since the EGR passage 34 protruding outward from the upper surface of the intake manifold 16 is formed so as to cross the upper part of the bracket 31, the EGR passage 34 blocks rainwater flowing along the upper surface of the intake manifold 16. As a result, it is possible to more reliably prevent the heater shut valve 28 from being flooded with rainwater or the like.

Although the examples of the present invention have been described in detail with reference to the drawings, each of the examples merely shows specific examples in carrying out the present invention. The technical scope of the present invention is not limited to each embodiment. The present invention can be modified in various ways without departing from the spirit of the present invention, and these are also included in the technical scope of the present invention.
It is also possible to configure the configuration of the present invention in an inverted relationship.
Further, the heater shut valve 28 can be provided in the middle of the heater cooling water supply passage 23A in the heater cooling water passage 23.

1 vehicle, 2 engine room, 3 dash panel, 4 cabin, 10 engine, 11 crank case, 12 cylinder block, 13 cylinder head, 14 cylinder head cover, 15 chain cover, 16 intake manifold, 17 radiator, 18 reservoir tank, 19 Water pump, 20 Cooling water outflow part, 21 and 22 Cooling water hose, 23 Cooling water passage for heater, 24 Heater core, 25 Cooling water outlet, 26 Cooling water return port for heater, 27 Cooling water inlet, 28 Heater shut valve, 29 Surge tank, 30 branch pipes, 31 brackets, 32 volts, 33 EGR coolers, 34 EGR passages, 35 EGR valves, 36 EGR cooling water passages, 37 cooling devices.

Claims (3)

A cooling device that circulates cooling water between the radiator and the engine body that has multiple cylinders arranged in the vehicle width direction.
An intake manifold having a surge tank extending in the cylinder row direction, the surge tank, and a plurality of branch pipes connecting each of the cylinders, and connected to the rear portion of the engine body.
A heater core connected to the engine body by a heater cooling water passage that circulates cooling water between the engine body and a heater shut valve that shuts off the flow of cooling water to the heater core by power supplied from a coupler unit. In an engine equipped with a heater core device consisting of
The heater shut valve is mounted in the middle of the heater cooling water return passage that constitutes the heater cooling water passage.
The heater cooling water return passage connects the cooling water outlet of the heater core and the cooling water return port for the heater of the engine body.
The bottom of the surge tank is arranged between the cooling water outlet and the heater cooling water return port in the vertical direction of the vehicle, while the branch pipe is connected to the upper part of the surge tank.
An engine heater core device characterized in that the heater shut valve is arranged so as to be close to the bottom of the surge tank. The first aspect of the heater shut valve is characterized in that the upper end is connected to the surge tank and the lower end is fixed to the surge tank via a bracket extending downward from the bottom of the surge tank. Engine heater core device. An EGR passage for introducing exhaust gas into the surge tank is formed on the upper surface of the intake manifold so as to bulge outward from the upper surface of the intake manifold.
The heater core device for an engine according to claim 2, wherein the EGR passage is formed so as to cross above the bracket.

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