JPS6088819A - Cooling device for v-type engine - Google Patents

Abstract

PURPOSE:To aim at simplification in a cooling system and prevention against heat conduction to suction air for cooling water, by installing each cooling water connector, collecting the cooling water, in engine's front and rear ends between both banks of a V-type engine and thereby connecting one side of these connectors to a radiator while the other side to an air-conditioning heater, respectively. CONSTITUTION:A V-type engine has a first bank 1a and a second bank 1b, while each of cooling water connectors 9 and 10 collecting cooling water out of each water jacket 8 is installed in both front and rear end parts of an engine between both these banks 1a and 1b. The connector 9 at the front end side is connected to a water pump 4 via a thermostat 13 by a passage 12 by way of a radiator 3 and a bypass passage 11. In addition, the connector 10 at the rear end side is connected to an air-conditioning heater 6 via a passage 14.

Description

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

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

However, in the above-mentioned conventional engine, since the hot water riser is provided in the intake manifold, the heat of the engine cooling water is transferred to the intake air through the intake manifold, and in the case of a fuel injection type engine, etc., the hot water riser is provided in the intake manifold. The disadvantage was that the charging efficiency was reduced and the engine output performance was reduced.

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) The object of the present invention is to provide a cooling water connector that collects engine cooling water from both banks of a type engine separately from the intake manifold, and to place the cooling water connector at an appropriate location between the two banks. By doing so, while making effective use of the space between both banks, the engine cooling water system is made independent of the intake system to prevent heat conduction of the engine cooling water to the intake air, and the engine cooling water system can be configured with a small number of passages. The 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 to provide cooling water connectors for collecting engine cooling water from both banks of the V-type engine at the front and rear ends of the engine between the two banks, respectively. One of the cooling water connectors is connected to a radiator, and the other cooling water connector is connected to an 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. The remaining water is circulated 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.
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 end and rear end 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 6-cylinder V-type engine according to an embodiment of the present invention, in which 1 is a V-type engine, and the 2-type engine 1 is inclined toward its center. The first bank 1a has three cylinders C, and the second bank 1b has three cylinders C, which are similarly formed at an angle.

There is an Aiki Hc between both banks la and Ib of the ■type engine 1.
Branch part 2 of intake manifold 2 for supplying intake air to
a is arranged.

Further, 3 is a radiator that is disposed in front of the ■-type engine 1 and cools 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.
A water pump 6 distributes and supplies water to both banks 1a and 1b of the type engine 1, and 6 is an air conditioning heater disposed at the rear of the type engine 1 to heat the passenger compartment with cool engine cooling water. Engine cooling water that has passed through the heater 6 is returned to the water pump 4 via a cooling water passage 7.

Both banks 1a of the V-type engine 1.

Cooling water connectors 9 and 10 are provided at the front and rear ends of the engine between banks 1a and 1b, respectively, for collecting engine cooling water from each water jacket 8.8 of each bank 1a, 1b. 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, there is a cooling water passage 12 inside the engine cooling water passage when the temperature of the engine cooling water is higher than a predetermined value.
A thermostat 13 is provided that opens the front cooling water connector 9 but closes when the temperature is lower than a predetermined value.
The circulation of engine cooling water to the radiator 3, which is collected in the radiator 3, can be controlled to be permitted or inhibited depending on the leakage. On the other hand, the cooling water connector 10 (
The rear cooling water connector (hereinafter referred to as the rear cooling water connector) is connected to the air conditioning heater 6 via the cooling water passage 14 so that the engine cooling water flowing and collecting through the rear cooling water connector 10 is circulated to the air conditioning heater 6. It is configured.

Furthermore, inside the rear cooling water connector 10, there is an E G R1l.
Cooling water temperature sensors 15 and 16 used for ilj control and fuel injection valve control are provided, and
A bypass passage 17 that bypasses the air conditioning heater 6 is provided.

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

In Fig. M2, the first bank 1a and the second bank 1b of the V-type engine 1 are cylinders each having 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. Block 33
and two cylinder heads 36,37 each having an intake boat 34 and an exhaust port 35 that open to each cylinder C of the cylinder block 33, and an intake boat 34 and an exhaust port 35 that open to the corresponding cylinder C. There are intake valves 4 whose opening and closing are controlled by valve operating mechanisms 38 and 39, respectively.
0 and an exhaust valve 41 are arranged, and the intake boat 34 of each bank 1a, 1b is provided with a
The branch portions 2a, 2a, . . . of the intersecting intake manifold 2 arranged above the bank 1
Exhaust manifold 42.a and 1b exhaust port 35.
43 are connected in communication with each other.

Further, as shown in FIG. 3, the water pump 4 installed at the front end of the type 1 engine 1 has its rotating shaft 4a rotatably connected to the crankshaft 32 via a power transmission mechanism 45, and is driven to rotate. At the same time, the pump chamber 4
A cooling water passage 5 from the radiator 3 and a cooling water passage 7 from the air conditioning heater 6 are connected to the cooling water passage 5 from the radiator 3 through a cooling water introduction passage 46 provided in front of the 0th cylinder row of the second bank 1b at the lower part thereof. , and communicates with the water jackets 8.8 (not shown in FIG. 3) of each bank 1a, Ib through the sink 1 on both the left and right sides.

Further, as shown in FIG. 4, both banks 1a of each cylinder head 36, 37 of the V-type engine 1.

Water jackets 8 for each bank 1a and Ib are provided on the upper surface of the front end and the upper surface of the rear end of the engine facing between 1b and 1b, respectively.
, 8 are open.

The outflow ports 50 to 53 have the same shape, with the one 50 located at the front end of the engine on the first bank 1a side and the one 53 located at the rear end of the engine on the second bank 1b side having the same shape. The one located at the rear end of the side engine 5
1 and 52 located at the front end of the engine on the second bank 1b side are formed in the same shape. As shown in FIG. 5, the front cooling water connector 9 at the front end of the engine is introduced into the cylinder blocks 33a and 33b of both banks la and 1b, and then connected to each cylinder head 36 and 37 above them. Both banks 1 of both cylinder heads 36, 37 are connected by bolts 54 so that the flowing engine cooling water is collected from the water jacket outlet 50, 52.
It is placed and fixed on the upper surface of the front end facing between a and ib.

Similarly, the rear cooling water connector 10 at the rear end of the engine has a mating surface shape with both cylinder heads 36.37 that is the same as the front cooling water connector 9. It is placed and fixed across the upper surface of the rear end facing between both banks 1a and lb.

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 gathering chamber 9a and a second gathering chamber 9b in the engine longitudinal direction.
A cooling water passage 12 (second
(not shown in the figure) are connected in communication, and the second
The gathering chamber 9b communicates with the pump chamber 4b of the water pump 4 via a bypass passage 11 (not shown in FIG. 3). Also, two temperature sensors 15, 16 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 on the upper surface of the rear part, and the bypass passage 1
7 is connected to the return cooling water passage 7 of the air conditioning heater 6ht.

Incidentally, at the lower part of the front wall of the front cooling water connector 9, each bank 1a is connected to the rotationally driven crankshaft 32.

An idler 56 is rotatably supported to press down and tension the timing belt 55 which is transmitted to the valve drive mechanism 38, 39 of 1b. Further, in FIG. 3, 57 is a cooling fan, and in FIG. 2, 58 and 59 are fuel injection valves, respectively.

Therefore, in the above embodiment, the water pump 4
After the engine cooling water discharged from is introduced into the cylinder block parts 33a and 33b of both banks 1a and 1b,
It flows into the cylinder head 36, 37 above it, and then
Four outlets 50 at the upper end of each cylinder head 36.37
53, flows into the front and rear cooling water connectors 9 and 10, which are separate from the intake manifold 2, and flows to the radiator 3 either directly or via the air conditioning heater 6. Therefore, the intake air in the intake manifold 2 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.

Also, the engine cooling water that cooled each bank 1a, lb is supplied to the front and rear connectors 9.1 between both banks 1a, 1b.
0, and then one cooling water passage 12.
14 to the radiator 3 and the air-conditioning heater 6, the cooling water circulation system can be easily configured with one cooling water passage each to the radiator 3 and the air-conditioning heater 6. Moreover, since the front and rear cooling water connectors 9.10 are provided between the banks 1a and 1b, it is possible to effectively utilize the space between the banks 1a and 1b. Furthermore, the engine cooling water is supplied to the radiator 3 through a front cooling water connector 9 at the front end of the engine.
Since the engine cooling water is supplied to the air conditioning heater 6 from the rear cooling water connector 10 at the rear end of the engine, the length of the cooling water passages 12 and 14 between them is shortened as much as possible. This makes it possible to significantly simplify the configuration of the cooling water circulation system. In addition, the mounting positions of the front and rear cooling water connectors 9 and 10 are swapped between FR skewers (front engine/rear drive vehicles) and FF vehicles (front engine/front mill drive skewers). Although the connections between the cooling water connectors 9 and 10, the radiator 3, and the air conditioning heater 6 are reversed, the mating surfaces of the cooling water connectors 9 and 10 with the cylinder heads 36 and 37 are formed in the same shape. The gasket interposed between the water connector 9.10 and the cylinder head 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 1o even when the air conditioning heater 6 is stopped, and the temperature sensor 15 .16, the cooling water temperature can always be detected accurately.

[Brief explanation of the drawing]

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 v-veii plane view of 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 system for a ■-type engine that cools the engine cooling water by circulating the engine cooling water from the first and second punctures to the radiator and air conditioning heater, and also heats the passenger compartment. Cooling water connectors are provided at the front and rear ends of the engine between the two banks, respectively, to collect the engine cooling water from both banks, one of the cooling water connectors is connected to the radiator, and the other is connected to the radiator. A cooling device for a ■-type engine, characterized in that it is connected to the air conditioning heater.