JPH0214963B2 - - 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 the 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 in the intake manifold to reduce the number of parts and to effectively utilize the space between the two banks.

However, in the above conventional system, 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, resulting in a reduction in the filling efficiency of the intake air in fuel-injected engines and the like, resulting in a reduction in engine output performance.

On the other hand, in a V-type engine, when the engine cooling water from both banks is then circulated to the radiator, it is preferable to circulate the engine cooling water from each bank to the radiator through independent passages in order to simplify the passage configuration. do not have.

Furthermore, since the cooling water circulation system includes an air conditioning heater that heats the passenger compartment with engine cooling water, the cooling water passages tend to be even more complex and diverse. Moreover, it is desired that the configuration be simple.

(Object of the Invention) 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 arranging the engine cooling water system, the space between the two banks can be effectively utilized, the engine cooling water system can be made independent from the intake system, preventing heat conduction of the engine cooling water to the intake air, and the engine cooling water system can be run with fewer passages. Another object is to have an efficient and simple structure with a path length as short as possible.

(Structure of the Invention) In order to achieve the above object, the structure of the present invention is such that the cooling water connector that collects the engine cooling water from both banks of the V-type engine is separate from the intake manifold arranged between the two banks. The cooling water connectors are provided at the front and rear ends of the engine between both banks, and one of the cooling water connectors is connected to the radiator, and the other cooling water connector is connected to the air conditioning heater.

As a result, the engine cooling water from both banks is collected at each cooling water connector at the front and rear ends of the engine between the V banks without going through the intake manifold, and then a part of it is collected through the air conditioning heater. It circulates to the radiator, and the remainder is immediately circulated to the radiator.

(Effects of the Invention) Therefore, according to the present invention, the engine cooling water from both banks is collected by the cooling water connector, so that the cooling water passages to the radiator and the air conditioning heater are connected to one each. can,
The cooling water circulation system can be simplified. Moreover, since the cooling water connector is provided separately from the intake manifold and placed between the two banks, it is possible to effectively utilize the space between the two banks while preventing heat conduction of the 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 each cooling water connector is provided at the front and rear ends of the engine, the path length to the radiator and air conditioning heater can be shortened as much as possible, allowing for a simple configuration of the cooling water circulation system. It can be done more noticeably.

(Example) Hereinafter, an example as a specific example of the technical idea 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.

Both banks 1a of the V-type engine 1,
At the front and rear ends of the engine between banks 1a and 1b, cooling water connectors 9 and 10, respectively, which collect the engine cooling water from the water jackets 8 and 8 of each bank 1a and 1b, are connected to the intake manifold located between both banks. It is provided separately from 2. The cooling water connector 9 at the front end of the engine (hereinafter referred to as the front cooling water connector) is connected to the radiator 3 via a cooling water passage 12 and to the water pump 4 via a bypass passage 11 that bypasses the radiator 3. In addition, a thermostat 13 is installed inside the thermostat 13, 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 engine cooling water collected in the radiator 9 to the radiator 3 is controlled to be permitted or inhibited depending on its temperature. On the other hand, the cooling water connector 1 at the rear end of the engine
0 (hereinafter referred to as the rear cooling water connector) is connected to the air conditioning heater 6 via the cooling water passage 14,
It is configured so that the engine cooling water that flows and collects in the rear cooling water connector 10 is circulated to the air conditioning heater 6. In addition, cooling water temperature sensors 15 and 16 used for EGR control and combustion injection valve control, respectively, are disposed in the rear cooling water connector 10, and a bypass passage 17 that bypasses the air conditioning heater 6 is provided. is provided.

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
Branch portions 2a, 2a, .
are connected to each other.

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 is supplied to the pump chamber 4b from the cooling water passage 5 from the radiator 3 and the air conditioning heater 6 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 jackets 8, 8 of each bank 1a, 1b on both left and right sides.
(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
Outlets 50, 51, 5 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.
2,53 are open. The outlet ports 50 to 53
50 located at the front end of the engine on the first bank 1a side and 53 located at the rear end of the engine on the second bank 1b side have the same shape, and the rear end of the engine on the first bank 1a side The part 51 located at the front end of the engine on the side of the second bank 1b and the part 52 located at the front end of the engine on the side of the second bank 1b are formed in the same shape. The front cooling water connector 9 at the front end of the engine is connected to both banks 1 as shown in FIG.
After being introduced into the cylinder block parts 33a and 33b of cylinders a and 1b, each cylinder head 36 above the cylinder block parts 33a and 33b,
Bolt 5 so that the engine cooling water flowing through 37 is collected from the water jacket outlets 50 and 52.
4, the cylinder heads 36 and 37 are placed and fixed across the upper surfaces of the front ends facing between the banks 1a and 1b. Similarly, the rear cooling water connector 10 at the rear end of the engine has the same mating surface shape as the front cooling water connector 9 with both cylinder heads 36 and 37, so that both cylinder heads 3
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.

The front cooling water connector 9 has a built-in thermostat 13 disposed at the upper part of the front end thereof, and has a first collection chamber 9a and a second collection chamber 9b in the front-rear direction of the engine.
A cooling water passage 12 (not shown in FIG. 2) to the radiator 3 is connected to the first gathering chamber 9a, and a second gathering chamber 9b is connected to a bypass passage 11 (not shown in FIG. 2). (not shown in the figure) to the pump chamber 4b of the water pump 4. In addition, two temperature sensors 15 and 16 built into the rear cooling water connector 10 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. The bypass passage 17 is connected to a return cooling water passage 7 from the air conditioning heater 6 .

Incidentally, at the lower part of the front wall of the front side cooling water connector 9, the rotational drive of the crankshaft 32 is connected to each bank 1a,
An idler 56 is rotatably supported to press down and tension the timing belt 55 which is transmitted to the valve operating mechanisms 38 and 39 of 1b. In addition, in Fig. 3, 57 is a cooling fan; in Fig. 2, 58,
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 that, it flows to the cylinder heads 36 and 37 above it, and then flows to each cylinder head 3.
6, 37 flows upward from the four outflow ports 50 to 53 at the upper end, and flows into the front and rear cooling water connectors 9, 10, which are separate from the intake manifold 2, to flow directly or Since it flows to the radiator 3 via the air conditioning heater 6, the intake manifold 2
The intake air inside the engine is not subjected to heat conduction from the engine cooling water, and the filling efficiency of the intake air is increased, thereby making it possible to improve the output performance of the engine.
Further, the engine cooling water that has cooled each bank 1a, 1b gathers at the front and rear connectors 9, 10 between both banks 1a, 1b, and then passes through one cooling water passage 12, 14, respectively, to the radiator 3 and Since it flows to the air conditioning heater 6, the radiator 3
and the number of cooling water passages to the air conditioning heater 6 is 1 each.
As a practical matter, a cooling water circulation system can be easily configured. Moreover, since the front and rear cooling water connectors 9 and 10 are provided between the banks 1a and 1b, it is possible to effectively utilize the space between the banks 1a and 1b. Further, engine cooling water is supplied to the radiator 3 from a front cooling water connector 9 at the front end of the engine, and engine cooling water is supplied to the air conditioning heater 6 from a rear cooling water connector 10 at the rear end of the engine. Therefore, the length of the cooling water passages 12 and 14 between them can be shortened as much as possible, and the structure of the cooling water circulation system can be more significantly simplified. In addition,
FR cars (front engine, rear drive cars) and
The mounting positions of the front and rear cooling water connectors 9, 10 are swapped with the FF (front engine/front drive vehicle), and the mounting positions of the front and rear cooling water connectors 9, 10 are swapped.
Although the connections between the radiator 3 and the air conditioning heater 6 are reversed, the cooling water connectors 9 and 10 have the same mating surface shape with the cylinder heads 36 and 37, so the cooling water The packing interposed between the connectors 9, 10 and the cylinder heads 36, 37 can be shared. Further, since the bypass passage 17 that bypasses the air conditioning heater 6 is provided, engine cooling water does not accumulate in the rear cooling water connector 10 even when the air conditioning heater 6 is stopped, and the temperature sensor 1
5 and 16, the cooling water temperature can always be detected accurately.

[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, 3
...Radiator, 6... Air conditioning heater, 9... Front cooling water connector, 10... Rear cooling water connector.

Claims (1)

[Claims] 1. A cooling device for a V-type engine that cools the engine cooling water by circulating the engine cooling water from the first and second banks to the radiator and the air conditioning heater, and also heats the interior of the vehicle. Cooling water connectors are provided at the front and rear ends of the engine between the two banks, which are separate from the intake manifold arranged between the two banks and which collect engine cooling water from both banks, respectively, A cooling device for a V-type engine, characterized in that one of the cooling water connectors is connected to the radiator, and the other is connected to the air conditioning heater.