JPH0418124B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cooling system for a V-type engine, and more particularly to an improvement in an engine cooling water circulation system.

(Prior Art) Conventionally, as a cooling device for a V-type engine, an intake manifold disposed between both banks of a V-type engine is used, as disclosed in Japanese Patent Application Laid-open No. 57-119142, for example. It is known that a hot water riser (water jacket) is provided within the intake manifold to reduce the number of parts and effectively utilize the space between the two banks.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional device, since the hot water riser is provided in the intake manifold,
Heat possessed by the engine cooling water is transferred to the intake air through the intake manifold, and in the case of fuel injection engines, etc., there is a drawback that the filling efficiency of the intake air is reduced and the engine output performance is lowered.

On the other hand, in a V-type engine, when the engine cooling water from both banks is subsequently circulated to the radiator, it is not preferable to make the cooling water passages from each bank to the radiator independent from the viewpoint of simplifying the passage configuration.

An object of the present invention is to provide a cooling water connector that collects engine cooling water from both banks of a V-type engine separately from the intake manifold, and to place the cooling water connector at an appropriate location between the two banks. By appropriately specifying the structure of the water connector, it is possible to make effective use of the space between both banks, make the engine cooling water system independent from the intake system, prevent heat conduction of the engine cooling water to the intake air, and make the engine cooling water To efficiently and simply configure a system with a small number of passages and as short a passage length as possible.

(Means for Solving the Problems) In order to achieve the above object, the present invention has a V-type configuration in which the engine cooling water from the first and second banks is circulated through the radiator to cool the engine cooling water. For an engine cooling system, a cooling water connector having a volume portion for collecting engine cooling water from both banks is provided at the end of the engine between the two banks. Furthermore, on the lower end surface of the portion located above each bank of the cooling water connector,
Forms a cooling water inlet. The cooling water connectors are fixed to both banks and connected to the radiator with each of the cooling water inlets directly communicating with the cooling water outlet formed on the upper end surface of each bank.

In that case, it is desirable to arrange a temperature sensing device that senses the temperature of the engine cooling water within the volume of the cooling water connector.

(Function) With the above configuration, in the present invention, the engine cooling water from both banks flows out from the cooling water outlet on the upper end face of each bank, and immediately flows out from the cooling water inlet on the lower end face of the cooling water connector. is introduced into the volume of the cooling water, collects therein, and then flows out of the cooling water connector into the radiator.

Here, the cooling water connector is provided separately from the intake manifold and placed between the two banks, making effective use of the space between the two banks while preventing heat conduction of engine cooling water to the intake air. The filling efficiency of intake air can be increased, and engine output performance can be improved.

Furthermore, since the cooling water connector itself straddles both banks of the V-type engine and is directly fixed to the two banks, both banks of the V-type engine expand and contract the gap between the two banks of the V-type engine even in its volume. Opening/closing operations can be effectively suppressed, improving the vibration damping effect.

Furthermore, since the cooling water inlet on the lower end surface of the cooling water connector is directly connected to the cooling water outlet on the upper end surface of each bank, there is no need to provide cooling water piping to communicate and connect each bank and the cooling water connector. The configuration of the cooling water circulation system can be simplified.

In addition, as mentioned above, the engine coolant that flows out of both banks immediately flows into the coolant connector, so if a temperature sensing device such as a thermostat or a coolant temperature sensor is placed inside the volume of the coolant connector,
It is possible to accurately respond to the engine coolant temperature after the bank has flowed out, and to detect the coolant temperature with high precision, and there is no need to separately provide a member for attaching a device such as a thermostat.

(Effects of the Invention) As explained above, according to the cooling device for a V-type engine of the present invention, it is possible to prevent heat transfer of engine cooling water to the intake air, increase the filling efficiency of the intake air, and The opening and closing operations of the banks can be effectively suppressed to improve the vibration damping effect, and the cooling water circulation system can be simplified by eliminating the need for cooling water piping between the cooling water connector and both banks.

In particular, if a thermostat or temperature sensor that responds to the engine coolant temperature is placed within the volume of the coolant connector, it will be possible to accurately respond to the engine coolant temperature immediately after each bank flows out, or to detect the coolant temperature with high accuracy. be effective.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a cooling water circulation system of a cooling device for a six-cylinder V-type engine according to an embodiment of the present invention, and 1 indicates a V-type engine.
The V-type engine 1 has a first bank 1a having three cylinders C inclined toward the center thereof, and a second bank 1b having three cylinders C similarly inclined. It is equipped with A branch portion 2a of an intake manifold 2 for supplying intake air to each cylinder C is disposed between both banks 1a and 1b of the V-type engine 1.

Further, 3 is a radiator disposed in front of the V-type engine 1 to cool the engine cooling water, and 4 is a radiator that receives low-temperature engine cooling water from the radiator 3 via a cooling water passage 5 to both banks of the V-type engine 1. 1
A water pump that distributes and supplies to a and 1b, 6 is V
This air conditioning heater is disposed at the rear of the engine 1 and heats the interior of the vehicle using high-temperature engine cooling water. has been returned to.

Further, reference numerals 8 and 8 refer to cooling water for cooling the V-type engine 1 by allowing the engine cooling water from the water pump 4 to flow in from the front end of the cylinder block portions 33a and 33b of each bank 1a and 1b. Upper cylinder head 36, 37
A water jacket that allows engine cooling water to flow out from the front end and rear end of the engine between the banks 1a and 1b corresponding to the cooling water outlets from the water jackets 8 and 8. are provided with cooling water connectors 9, 10 having volumes 9a, 10a for collecting engine cooling water from the respective water jackets 8, 8, respectively. The cooling water connector 9 (hereinafter referred to as front cooling water connector) at the front end of the engine is connected to the cooling water passage 1.
2 to the radiator 3 and to the water pump 4 via a bypass passage 11 that bypasses the radiator 3, and a volume portion 9a inside thereof is provided with a temperature-sensitive sensor for detecting the temperature of the engine cooling water. A thermostat 13 is provided as a temperature sensing device, which opens the cooling water passage 12 when the temperature of the engine cooling water is higher than a predetermined value, and closes when the temperature is lower than the predetermined value. Circulation of the collected engine cooling water to the radiator 3 is controlled to be permitted or inhibited depending on its temperature. On the other hand, a cooling water connector 10 at the rear end of the engine (hereinafter referred to as the rear cooling water connector) is connected to the air conditioning heater 6 via a cooling water passage 14, and the engine is connected to the rear cooling water connector 10. It is configured to circulate cooling water to the air conditioning heater 6. Cooling water temperature sensors 15 and 16 are disposed in the volume portion 10a of the rear cooling water connector 10 as temperature sensing devices that are used for EGR control and fuel injection valve control, respectively, and sense the engine cooling water temperature. In addition, a bypass passage 17 is provided to bypass the air conditioning heater 6 so that the engine cooling water temperature can be accurately detected by the temperature sensors 15 and 16 even when the air conditioning heater 6 is stopped. The engine cooling water is prevented from remaining in the side cooling water connector 10.

Next, the specific structure of the cooling system for the V-type engine will be explained based on FIGS. 2 to 5.

In FIG. 2, the first bank 1a and the second bank 1b of the V-type engine 1 each have three cylinders C in the axial direction of the crankshaft 32, in which a piston 31 slides up and down in a cylinder 30 inclined at a predetermined angle. It consists of a cylinder block 33 and two cylinder heads 36 and 37 having an intake port 34 and an exhaust port 35 opening to each cylinder C of the cylinder block 33, and the cylinder C corresponding to the intake port 34 and exhaust port 35. An intake valve 40 and an exhaust valve 41, which are controlled to open and close by valve operating mechanisms 38 and 39, are arranged at the openings to the banks 1a and 1b, respectively, and the intake ports 3 of each bank 1a and 1b
4 are connected to branch portions 2a, 2a, . . . of a cross-shaped intake manifold 2 arranged between and above both banks 1a, 1b, and exhaust manifolds 42, 43 are connected to exhaust ports 35 of each bank 1a, 1b, respectively. It is connected.

Further, as shown in FIG. 3, the water pump 4 provided at the center of the front end of the V-type engine 1 has its rotating shaft 4a rotatably connected to the crankshaft 32 via a power transmission mechanism 45, and is rotationally driven. At the same time, cooling water from the cooling water passage 5 from the radiator 3 and the cooling water from the air conditioning heater 6 are supplied to the pump chamber 4b through a cooling water introduction passage 46 provided in the lower part in front of the cylinder row C of the second bank 1b. The water passage 7 is connected to the water jacket 8 of each bank 1a, 1b on both left and right sides thereof.
8 (not shown in FIG. 3).

Furthermore, as shown in FIG. 4, both banks 1 of each cylinder head 36, 37 of the V-type engine 1
Cooling water outlet ports 50, 51 of the water jackets 8, 8 of each bank 1a, 1b are provided on the upper surface of the front end and the upper surface of the rear end of the engine facing between a and 1b, respectively.
Openings 52 and 53 are formed. On the other hand, in the front cooling water connector 9 at the front end of the engine, as shown in FIG. , 9c are formed with openings. The front cooling water connector 9 is connected to the cooling water inlet ports 9b, 9c so as to directly contact and communicate with the cooling water outlet ports 50, 52 on the upper end surfaces of the banks 1a, 1b. 54, both banks 1a and 1b of both cylinder heads 36 and 37
It is placed and fixed across the upper surface of the front end facing in between.

Similarly, the rear cooling water connector 10 at the rear end of the engine has a mating surface with both cylinder heads 36 and 37 formed in the same shape as the front cooling water connector 9, and as shown in FIG. Each bank 1
Cooling water inlets 10b, 10 each communicate with the volume portion 10a on the lower end surface of the portion located above a, 1b.
c is formed with an opening, and each cooling water inlet 1
0b, 10c are connected directly to the cooling water outlets 51, 53 on the upper end surface of each bank 1a, 1b, and both cylinder heads 3 are connected in the same manner as above.
It is placed and fixed across the upper surface of the rear end facing between both banks 1a and 1b of banks 6 and 37.

As shown in FIG. 3, the front cooling water connector 9 has a built-in thermostat 13 disposed at the upper part of the front end thereof, and is divided into a first collecting chamber 9a and a second collecting chamber 9b in the engine longitudinal direction. A cooling water passage 12 (not shown in FIG. 3) to the radiator 3 is connected to the first gathering chamber 9a, and a bypass passage 11 (not shown in FIG. 3) is connected to the second gathering chamber 9b. It is communicated with the pump chamber 4b of the water pump 4 via the water pump 4). In addition, two temperature sensors 15, 1 built into the rear cooling water connector 10
6 are respectively arranged at the rear, and a cooling water passage 14 and a bypass passage 17 to the air conditioning heater 6 are opened at the upper surface of the rear part, and the bypass passage 1
7 is connected to a return cooling water passage 7 from the air conditioning heater 6 .

Further, the front cooling water connector 9 is connected to the intake manifold 2 disposed between both banks 1a and 1b.
, and the rotational drive of the crankshaft 32 is connected to each bank 1a, 1.
It is arranged in the empty space between both banks 1a and 1b that exists above the timing belt 55 that transmits the transmission to the valve drive mechanisms 38 and 39 of b.

Incidentally, an idler 56 that presses the timing belt 55 downward to tension it is rotatably supported at the lower part of the front wall of the front cooling water connector 9. Further, in FIG. 3, 57 is a cooling fan, and in FIG. 2, 58 and 59 are fuel injection valves.

Therefore, in the above embodiment, the engine cooling water discharged from the water pump 4 is distributed to the cylinder block portions 33a, 33 of both banks 1a, 1b.
After cooling the entire V-type engine 1 by flowing from the front end of the cylinder head 36,
7 and then to each cylinder head 36, 37.
The cooling water flows upward from the four cooling water outlets 50 to 53 that open on the upper surface of the front and rear ends of the cooling water connectors 9, 10, and immediately flows to the cooling water inlets 9b, 9c, The cooling water flows through the front and rear cooling water connectors 9 and 10 through the cooling water connectors 10b and 10c. Thereafter, the air flows to the radiator 3 either directly or via the air conditioning heater 6.

Here, the front and rear cooling water connectors 9, 10
is separate from the intake manifold 2, so the intake air in the intake manifold 2 is supplied to each cooling water connector 9,
There is no heat conduction from the engine cooling water flowing through the engine, and the intake air filling efficiency is increased.
Therefore, it is possible to improve the output performance of the engine.

In addition, the front and rear cooling water connectors 9, 10
are the cooling water inlets 9b, 9c, 10 on the lower end surface.
b and 10c are placed and fixed on both banks 1a and 1b in a state where they are in direct communication with the cooling water outlets 50 to 53 of the water jackets on the upper surfaces of the cylinder heads 36 and 37 of each bank 1a and 1b, respectively. , the expansion and contraction of the interval between the banks 1a and 1b can also be suppressed by the internal volume portions 9a and 9b,
The vibration damping effect on the V-type engine 1 can be enhanced.

Moreover, since the cooling water inlets 9b to 10c of the front and rear cooling water connectors 9 and 10 are directly connected to the cooling water outlets 50 to 53 on the upper surface of each bank 1a and 1b, Cooling water piping to each cooling water connector 9, 10 can be eliminated, and the cooling water circulation system can be configured accordingly.

In addition, since the thermostat 13 is disposed within the volume portion 9a of the front cooling water connector 9, the thermostat 13 responds accurately to the temperature of the engine cooling water immediately after flowing out of each bank 1a, 1b. , the temperature of the engine cooling water can be well controlled, and the branching part between the cooling water passage 12 to the radiator 3 and the bypass passage 11 of the radiator 3 can be disposed between both the banks 1a and 1b. The space between banks 1a and 1b can be used more effectively.

Moreover, since both the temperature sensor 15 for EGR control and the temperature sensor 16 for fuel injection valve control are arranged in the volume part 10a of the rear cooling water connector 10, the engine immediately after flowing out of each bank 1a, 1b The temperature of the cooling water can be detected with high precision, and the amount of exhaust gas recirculation and the amount of fuel injection can be controlled with high precision.

Furthermore, the front cooling water connector 9 connects both banks 1
The timing belt 5
Since it is provided in the empty space between both banks 1a and 1b that exists above 5, both banks 1a and 1b
It is possible to effectively utilize the empty space between the two.

In the above embodiment, a case has been described in which a rear cooling water connector 10 is provided in addition to the front cooling water connector 9, but it goes without saying that this rear cooling water connector 10 may not be provided. However, when the rear connector 10 is also provided as in the above embodiment, it is more preferable because the length of the cooling water passage to the air conditioning heater 6 can be shortened as much as possible.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a refrigerant piping system diagram, FIG. 2 is a vertical cross-sectional rear view showing a specific configuration, FIG. 3 is a side view of the same, and FIG. 4 is a diagram showing the arrangement of cooling water connectors. The plan view shown in FIG. 5 is a sectional view taken along the - line in FIG. 3. 1a...first bank, 1b...second bank, 2...intake manifold, 3...radiator, 8...water jacket, 9...front cooling water connector, 9a...capacity part, 9b, 9c...cooling water inlet, 10... Rear cooling water connector, 10a...volume part, 10b, 10c
...Cooling water inlet, 13...Thermostat (temperature sensing device), 15...EGR control temperature sensor (temperature sensing device),
16...Fuel injection valve control temperature sensor (temperature sensing device),
33a, 33b...Cylinder block part, 36, 3
7...Cylinder head, 50-53...Cooling water outlet.

Claims (1)

[Scope of Claims] 1. A cooling device for a V-type engine, which cools the engine cooling water by circulating the engine cooling water from the first and second banks to a radiator, wherein the engine cooling water is cooled between the two banks. A cooling water connector having a volume portion for collecting engine cooling water from both banks is provided at the end, and each cooling water connector has a cooling water inlet on the lower end surface of the portion located above each bank. The cooling water connectors are fixed to both banks, with each cooling water inlet directly communicating with a cooling water outlet formed on the upper end surface of each bank, and connected to the radiator. A cooling system for a V-type engine. 2. A cooling device for a V-type engine according to claim 1, wherein the cooling water connector is provided with a temperature-sensing device that senses the temperature of the engine cooling water in the volume portion.