JPS62247116A - Cooling device for engine - Google Patents

Abstract

PURPOSE:To improve the degree of freedom of a layout of auxiliary devices and to facilitate a work of installing a cooling water pipe, by a method wherein a water pump is disposed on the front side of a cross mounted engine and a thermostat on the rear end side, and structure of a piping therebetween is devised. CONSTITUTION:A water pump 8 is disposed on the front end side of an engine body 2 located so that its side is disposed approximately in parallel to a radiator 1, and a thermostat 7 is disposed to the side of a rear end. A cooling water pipe 11C, through which the thermostat 7 and the water pump 8 are intercommunicated, is disposed along the side of an engine body 2. A cooling water inlet 6 formed on the front end side of the engine body 2 is connected to the water pump 8, and a cooling water outlet 4, formed on the read end side of the engine body 2, is connected to a cooling water pipe 12. Further, a cooling water inflow port 1A and an outflow port 1B are formed on the rear end side of the radiator 1, and are connected to the thermostat 7 through cooling water pipes 11A and 11B.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine cooling device, and more particularly to a cooling water circulation system structure for an engine that is arranged so that the side surface of the main body is substantially parallel to a radiator.

(Prior art) In general, there are two types of engine cooling systems: an in-line system and a bottom bypass system. In the bottom bypass system, a radiator, thermostat, and The water pump is installed sequentially from the cooling water if1 port side, and a bypass passage is provided to bypass the radiator.When the cooling water is below a predetermined temperature, the cooling water passage leading to the radiator is installed to promote warming up. is closed by a thermostat, allowing cooling water to bypass the radiator. In conventional engine cooling systems of this type, both the thermostat and the water pump are installed at the front end of the engine body.

However, in such a 411&, the mounting position of the thermostat is limited by the timing belt, etc. that drives the moving belt system provided on the front end side of the engine body, and in order to eliminate the interference of the timing belt T, If the thermostat is placed on the front side of the engine body, the layout of auxiliary equipment such as compressors for power steering and air conditioning will be greatly restricted. Furthermore, in order to eliminate interference with this auxiliary equipment, if the thermostat is placed immediately behind the auxiliary equipment, when piping the cooling water passage that connects the thermostat and the radiator, there will be no interference with the manifold attached to the side of the engine body. Because it is necessary to avoid
Piping work χ becomes troublesome.

In addition, there is a configuration in which a water pump is installed on the front end side of the engine body and a thermostat is installed on the rear end side (Jitsugaku No. 55-130014), but the engine body is installed in a direction perpendicular to the radiator. Therefore, no changes have been made to the layout of auxiliary equipment or the conditions for piping work.

(Purpose of IJJ) In view of the circumstances as described in 1-1, the present invention provides an engine cooling device that can increase the width of the auxiliary equipment layout and simplify the piping work of the cooling water passage. , is 1J.

(Structure of the Invention) To achieve the above object, an engine cooling device according to the present invention includes:
As shown in Figures 1 and 2, a water pump 8 and a thermostat 7 are placed on the opposite end side of the engine body 2, which is arranged so that the side surface is approximately parallel to the radiator l, and the thermostat 7 is placed on the rear end side surface. A cooling water pipe llc is installed along the side surface of the engine body 2 on the radiator side, communicating the cooling water pipe 6 formed on the front end side of the engine body 2 with the water pump 8, and communicating with the water pump 8. A cooling water outlet 4 formed at the rear end of the engine body 2 is communicated with the thermostat 7 via a cooling water pipe 12, and a cooling water inlet IA and an outlet IB are formed at the rear end of the radiator. The cooling water outlet 4 and the thermostat 7 are configured to communicate with the cooling water inlet IA and the cooling water outlet IB via cooling water pipes 11A and 11B, respectively.

(Example) In the third to fifth illustrated cooling devices, a cooling water outlet 4 is formed in the cylinder head 3 part on the rear end side of the engine body 2, and a cooling water population 6 is formed in the cylinder block 5 part on the @ end side, respectively. The water outlet 4 and the cooling water population 6 communicate with each other via a water jacket 15 formed around the cylinder 14 in the engine body 2. The thermostat 7 is arranged at the rear end of the engine body 2, and the water pump 8 is arranged at the front end. The radiator side cooling water person lower A is placed on one side, and the bypass passage 12 side cooling water person 1 is placed on the other side.
．． 17B, the heater side cooling water lower C and the cooling water outlet lower D to the water pump 8 are arranged.

The water pump 8 has one housing 8A formed on the cylinder block 5.

The other housing 8B is formed on the side of the chain cover 16 as shown in the seventh figure which is formed separately from the cylinder block 5, and the chain cover 16 is connected to the cylinder block 5 to form a set as shown in the eighth figure. It is now possible to use it. The rotating shaft 8D of the impeller 8C in the housing is connected to a crank pulley attached to a crankshaft (not shown) via a pulley 9 and a bell 10 wound around the pulley 9.

The cooling water outlet CI4 and the cooling water inlet 111A formed in a part of the rear end side of the engine body 2 of the radiator 1 are connected via the cooling water pipe IIA as shown in the first and second figures. Similarly, the cooling water outlet IB formed at the lower part of the rear end of the engine body 2 and the thermostat 7 arranged at the rear end of the engine body 2 are connected to the cooling water pipe 11B.
connected via. The thermostat 7 and the suction side of a water pump 8 provided at one end of the engine body 2 are connected via a cooling water pipe IIc, and the discharge side of the water pump 8 is connected to the cooling water intake 6 of the engine body 2. ing. Furthermore, the cooling water outlet 4 of the engine body 2 and the thermostat 7 are connected via a bypass passage 12 that bypasses the radiator I.

The cooling water pipe ttC connecting the thermostat 7 and the water pump 8 is made of a metal pipe such as stainless steel, and is attached to the side of the cylinder head 3 of the engine body 2 via its flange 13A. The exhaust manifold 13 is installed along the side surface of the engine body 2 between the exhaust manifold 13 and the side surface of the engine body 2.

In the above-mentioned cooling device configured with a button, the cooling water that flows into the engine body 2 from the water pump 8 via the cooling water intake 6 passes through the water jacket of the cylinder block 5 and the cylinder head 3, and then passes through the cooling water outlet [ It will be leaked from J4. When the coolant temperature that flows out from the engine body is below a predetermined temperature, the coolant returns to the water pump 8 from the bypass passage 12 via the thermostat 7 and the coolant pipe IIc, and the coolant temperature reaches the predetermined temperature. Once it crosses the line, the water returns from the cooling water pipe IIA to the water pump 8 via the radiator 1, the cooling water pipe IIB, the thermostat 7, and the cooling water pipe IIC.

Note that the cooling water pipe IIG between the thermostat 7 and the water pump 8 is arranged so as to be sandwiched between the exhaust manifold 13 and the side of the engine body 2, and
Since it is made of manufactured pipes, when the engine warms up, the exhaust heat will also warm the cooling water in the cooling water pipe IIIC, making it possible to reduce the temperature rise of the cooling water. - Engine warm-up characteristics are improved.

(Effects of the Invention) According to the engine cooling device according to the present invention as described above, since the thermostat is removed from the front end side of the engine body, there is a degree of freedom in the layout of the auxiliary class a arranged at the tNj end side of the engine body. will improve. In addition, the cooling water pipe section that connects the water pump and thermostat is placed along the engine body, and the cooling water pipe section that connects the engine body's cooling water outlet, radiator, and thermostat, respectively, is concentrated at the rear end of the engine body. , interference between the cooling water pipe and the manifold can be minimized, making piping work X easier. Furthermore, since the length of the cooling water pipe can be shortened, the water pump efficiency and cooling performance can be improved by reducing the resistance in one passage.

[Brief explanation of drawings]

FIG. V is a plan view showing the overall configuration of the cooling device according to the present invention, FIG. 2 is a view taken along arrow A, and FIG. S3 is a detailed iEIM diagram showing a specific example thereof. FIG. 4 is a plan view when the cylinder block is removed, and FIG. 5 is a right side view of FIG. 3. Figure t56 is a left side view of the 17%3 figure, Figure 7 is a front view of main parts of the chain cover, Figure 8 is a vertical sectional view of the water pump, and Figure 759 is a configuration diagram of the thermostat. ! ...Radiator IA...Cooling water inlet IB
...Cooling water outlet 2...Engine body 4...
Cooling water outlet [ko 6...Cooling unit lower...Thermostat 8...Water pump 11A, llB, 1
1G...Cooling water pipe 12...Bypass passage

Claims (1)

[Claims] A water pump is installed on the front end side of the engine body, which is arranged so that the side surface is substantially parallel to the radiator, and a thermostat is installed on the rear end side surface, and a cooling water is installed in communication between the thermostat and the water pump. A pipe is installed along the side surface of the engine body on the radiator side, and a cooling water inlet formed at the front end of the engine body is connected to the water pump, and a cooling water outlet formed at the rear end of the engine body is connected to the thermostat. An engine cooling system characterized in that a cooling water inlet and an outlet are formed on the rear end side of the radiator, and the cooling water outlet and the thermostat are communicated with the cooling water inlet and the outlet, respectively. Device.