KR960012124B1 - Cylinder head intake pre-cooling type engine & method - Google Patents

Abstract

The automobile engine and its cooling method regularly cools the internal part of the engine by applying the cylinder head intake pre-cooling type method. The apparatus comprises: an intake and an exhaust water jacket(29,31) completely separated by a partition wall(27) of one cylinder head water jacket(9) ; a 1st and a 2nd water jacket(7a,7b) separated by a 2nd partition wall of another cylinder water jacket(7); a water inlet path(33) formed in the cylinder head intake(21) for flowing the cooling water from a radiator(13) to a thermostat(17) and the intake water jacket(29); a downward water path(35) formed in the cylinder block and the intake water jacket(29); an upward water path(39) formed in the cylinder block and the exhaust water jacket(31).

Description

Pre-cooling method of the cylinder head intake unit Automobile engine and its cooling method

1 is a cooling system of a general automotive engine.

2 is a cross-sectional view of a portion of a general automotive engine incision.

3 is a view schematically showing a cylinder head and a cylinder block of an automobile engine to explain an automobile engine and a cooling method thereof according to the present invention.

* Designation of symbols for the main parts of the drawing

1: engine 3: cylinder block

5: cylinder head 7: cylinder block water jacket

7a: 1st water jacket 7b: 2nd water jacket

9: cylinder head water jacket 11: water pump

13: radiator 15: fan

17: thermostat 21: cylinder head intake

23: cylinder head exhaust portion 27: the first partition

29: intake portion water jacket 31: exhaust portion water jacket

33: inflow passage 35: downward passage

37: second bulkhead 39: upward passage

41: outflow

The present invention relates to an automobile engine and a cooling method thereof, and more particularly, to an automobile engine and a cooling method for pre-cooling a cylinder head intake unit to uniformly cool the engine and improve the intake efficiency.

In general, the engine must be cooled in order to prevent the engine from overheating while maintaining the proper temperature during engine operation to prevent damage to the engine. Engine cooling methods include air cooling to cool the inside of the engine using air cooling and cooling water to be cooled by air received while driving a vehicle, and water cooling is generally used.

FIG. 1 shows a cooling system diagram showing a circulation path of the cooling water of the water-cooled engine 1, and FIG. 2 shows a section of the general water-cooled engine 1 in a section.

As can be seen from FIGS. 1 and 2, the cooling system of the engine 1 includes a cylinder block jacket jacket 7 formed in the cylinder block 3 and a cylinder head water jacket 9 formed in the cylinder head 5. ), A water pump 11 for pumping and circulating the coolant to the water jackets 7 and 9, a radiator 13 for transferring heat of the coolant having a high temperature to the outside to cool the fan, and a fan for ventilating the radiator 13 ( 15), the thermostat 17 is configured to automatically open and close the passage according to the change of the coolant temperature inside the engine to adjust the coolant temperature accordingly. In addition, a plurality of cooling water passages 19 are formed between the cylinder block water jacket 7 and the cylinder head water jacket 9 so that the cooling water can be circulated.

In addition, the circulation path of the coolant is first introduced into the cylinder block water jacket 7 by the water pump 11 through the coolant passage 19 through the cylinder head water jacket 9 through the coolant passage 19. Return to the radiator 15 is to be cooled.

However, since the cooling method as described above is a cylinder block pre-cooling method in which the coolant is circulated from the cylinder block 3 of the engine 1 to the cylinder head 5, the engine 1 is not uniformly cooled and the engine 1 ) There is a problem that the temperature deviation inside is large, and that the intake efficiency of the engine is lowered because the cylinder head intake portion 21 (see FIG. 3) becomes a high temperature.

In order to solve this problem, first, the coolant should be changed to the cylinder head pre-cooling method in which the coolant is circulated from the cylinder head 5 to the cylinder block 3, but in the generally adopted cylinder head pre-cooling method, the thermostat Since (17) is located in the cylinder block 3 together with the water pump, there is a difficulty in that a complete shape change of the engine 1 currently used is required. Second, a method of lowering the temperature of the cylinder head intake unit 21 is provided. In the form where the coolant circulates from the cylinder block 3 to the cylinder head 5, the coolant having a high temperature flows into the cylinder head 5 so that the temperature decrease of the cylinder head intake part 21 is impossible. When the bottom of the cylinder head 5 is cooled, the temperature of the cylinder head exhaust 23 (refer to FIG. 3) is lowered, so that the exhaust efficiency of the engine is lowered.

Therefore, the present invention can uniformly cool the inside of the engine by applying the cylinder head pre-cooling method without changing the overall structure of the engine in order to solve the problems of the prior art as described above, the temperature of the cylinder head intake portion is lowered It is an object of the present invention to provide a cylinder head intake unit pre-cooling type vehicle engine and its cooling device capable of improving the intake efficiency.

In order to achieve the above object, a cylinder head intake unit pre-cooling-type automobile engine according to the present invention includes a cylinder block water jacket and a cylinder head water jacket, respectively, formed on the cylinder block and the cylinder head, and circulating the cooling water to the water jacket and the radiator. In a motor vehicle having a water pump and a thermostat for automatically adjusting the temperature of the coolant by automatically opening and closing the passage according to the change of the coolant temperature inside the engine, the first partition wall provided in the cylinder head water jacket) An intake portion water jacket and an exhaust portion water jacket which are completely separated from each other, a first water jacket portion and a second water jacket portion separated at one end by a second partition wall provided in the cylinder block water jacket, and the radiator; Cylinder head intake so that cooled coolant flows through the thermostat to the intake air jacket An inflow path formed in the portion, a downward passage formed in the cylinder head intake portion and the cylinder block so that the coolant passing through the intake portion water jacket is transferred to the first water jacket portion of the cylinder block water jacket, and the cylinder block water jacket Cooling water passing through the first water jacket portion and the second water jacket portion of the cylinder block water jacket is formed in the cylinder block and the cylinder head exhaust portion so as to be transferred from the second water jacket portion of the cylinder block water jacket to the exhaust water jacket Characterized in that it consists of an upward passage and an outlet passage for cooling water flowing through the exhaust water jacket to circulate to the radiator by the water pump.

In addition, in the present invention, a method of cooling a cylinder head intake unit pre-cooling type automobile engine is a vehicle in which coolant cooled in a radiator is circulated to a radiator through a cylinder block water jacket and a cylinder head water jacket inside an engine by a thermostat and a water pump. A cooling method of an engine, comprising: a first step of cooling a cylinder head intake unit while the cooling water inside the engine reaches a predetermined temperature, the cooling water flows from the radiator along an inflow path formed in the cylinder head and passes through the intake air jacket; Cooling water passing through the cylinder head intake portion flows into the cylinder block water jacket along the downward passage to sequentially pass through the first water jacket portion and the second water jacket portion to cool the cylinder block, and passes through the cylinder block. Cooling water flows along the upward passage and passes through the exhaust water jacket The cooling portion and cylinder head exhaust outlet along an outlet and being composed of the third step is by pumping the water pump to the radiator.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are given to parts having the same functions as in the conventional automobile engine, and repeated descriptions are omitted.

3 is a view schematically illustrating a cylinder head and a cylinder block of a vehicle engine in order to explain a vehicle engine of a cylinder head intake unit pre-cooling method according to the present invention.

As shown in FIG. 3, the virtual head 25 of the cylinder head intake part 21 and the cylinder head exhaust part 23 of the cylinder head 5 in the cylinder head intake part pre-cooling type automobile engine according to the present invention is shown in FIG. The inlet portion water jacket 29 and the exhaust portion water jacket 31 are formed by the first partition 27 which divides the cylinder head water jacket 9 in half and blocks each other. In the intake portion water jacket 29, the coolant that has passed through the inflow passage 33 and the cylinder head intake portion 23 in which the coolant cooled in the radiator 13 is introduced through the thermostat 17 is cylinder block water. A downward passage 35 is formed to be conveyed to the first water jacket portion 7a of the jacket 7. On the other hand, the cylinder block water jacket (7) is provided with a second partition wall (37) for dividing the cylinder block water jacket (7) in half except for the end opposite to the downward passage (35). As a result, the cylinder block water jacket 7 is provided with a first water jacket portion 7a and a second water jacket portion 7b communicating with each other at the left end. The second water jacket portion 7b of the cylinder block water jacket 7 is formed with an upward passage 39 through which coolant is transferred to the exhaust water jacket 31. On the other hand, the exhaust water jacket 31 is formed with an outlet passage 41 through which the coolant passing through the cylinder head 5 and the cylinder block 7 is discharged by the water pump 11.

In the present invention, the water pump 11 is configured to circulate the cooling water by forcibly feeding the cooling water flowing out of the outlet 41 of the exhaust water jacket 31 to the radiator 13.

Hereinafter will be described the operation of the vehicle engine according to the present invention configured as described above.

First, when the coolant inside the engine 1 according to the heel reaches a predetermined temperature, the passage of the coolant is opened by the thermostat 17. At the same time, the water pump 11 is operated to circulate the cooling water. In this case, the water pump 11 is configured to circulate the cooling water by forcibly feeding the cooling water flowing out of the outlet 41 of the exhaust water jacket 31 to the radiator 13 as described above. In this way, the passage of the cooling water is opened by the thermostat 17, and when the water pump 11 is operated, the cooling water is intake water jacket along the inflow path 33 formed in the cylinder head 5 from the radiator 13. 29).

Cooling water introduced into the intake portion water jacket 29 cools the cylinder head intake portion 21. Therefore, since the coolant cooled in the radiator 13 first cools the cylinder head intake unit 21, the temperature of the cylinder head intake unit 21 is sufficiently lowered to improve the intake efficiency of the engine. In this case, the coolant flows into the cylinder head 5, but the intake portion water jacket 29 and the exhaust portion water jacket 31 separate from each other to cool only the cylinder head intake portion 21. It is possible to avoid that the temperature of the cylinder head exhaust (23) is lowered even if the flow into the () to lower the exhaust efficiency of the engine.

Next, the cooling water that cools the cylinder head intake unit 21 while passing through the intake unit water jacket 29 flows into the cylinder block water jacket 7 along the downward passage 35. As described above, the cylinder block water jacket 7 is provided with a second partition wall 37 so that the coolant passes through the first water jacket portion 7a and the second water jacket portion 7b in the shape of a cylinder, and then the cylinder block. Cool (7). The cylinder block 7 is thus cooled uniformly.

Cooling water that cools the cylinder block 7 while passing through the first water jacket portion 7a and the second water jacket portion 7b of the cylinder block water jacket 7 is discharged along the upward passage 39. It flows into the base water jacket 7 and cools the cylinder head exhaust 23. Since the coolant flowing into the exhaust water jacket 7 increases in temperature while cooling the cylinder head intake unit 21 and the cylinder block 7, the temperature of the cylinder head exhaust unit 23 is lowered more than necessary. Not only does it reduce the exhaust efficiency of the engine, but also positively increases the exhaust efficiency of the engine.

Finally, the cooling water that has cooled the cylinder head exhaust portion 23 while passing through the exhaust portion water jacket 7 flows out along the outflow path 41 and is forced to the radiator 13 by the water pump 11 to be cooled. .

As described above, the present invention can improve the cooling performance by reducing the temperature deviation inside the engine by uniformly cooling the inside of the engine by applying the pre-cooling method of the cylinder head intake unit without changing the overall structure of the engine. In addition, the intake efficiency can be improved by lowering the temperature of the cylinder head intake unit.

Claims (2)

Cylinder block water jacket (7) formed in the cylinder block (3) and the cylinder head (5), respectively, the cylinder head water jacket (9), the water for circulating the cooling water to the water jacket (7, 9) and the radiator (13) In an automobile engine having a pump (11) and a thermostat (17) for automatically adjusting the temperature of the coolant by opening and closing a passage automatically in accordance with the coolant temperature change in the engine, the cylinder head water jacket (9) An intake portion water jacket 29 and an exhaust portion water jacket 31 which are completely separated from each other by the first partition wall 27 provided therein, and a second partition wall 37 provided in the cylinder block water jacket 7. The first water jacket portion 7a and the second water jacket portion 7b, one end of which are communicated with each other, and the coolant cooled by the radiator 13 passes through the thermostat 17 and the intake portion water jacket 29 An inflow passage 33 formed in the cylinder head intake portion 21 so as to flow into the A downward passage formed in the cylinder head intake portion 21 and the cylinder block 7 so that the coolant passing through the jacket 29 is transferred to the first water jacket portion 7a of the cylinder block water jacket 7. 35) and the second water jacket of the cylinder block water jacket 7 with the coolant passing through the first water jacket portion 7a and the second water jacket portion 7b of the cylinder block water jacket 7 in sequence. An upward passage 39 formed in the cylinder block 7 and the cylinder head exhaust 23 to be transferred from the portion 7b to the exhaust portion water jacket 31, and the exhaust portion water jacket 31; Cooling water passing through the cylinder head intake unit pre-cooling type vehicle engine, characterized in that consisting of the outlet passage 41 is also circulated to the radiator (13) by the water pump (11). The coolant cooled in the radiator 15 is circulated by the thermostat 17 and the water pump 11 to the radiator 15 through the cylinder block water jacket and the cylinder head water jacket 7 and 9 inside the engine 1. In the cooling method of the automobile engine, when the coolant inside the engine reaches a predetermined temperature, the coolant flows from the radiator 13 along the inflow path 33 formed in the cylinder head 5 to open the intake air jacket 29. The first step of cooling the cylinder head intake unit 21 while passing through, and the coolant passing through the cylinder head intake unit 21 flows into the cylinder block water jacket 7 along the downward passage 35 to the first water. A second step of cooling the cylinder block 7 while sequentially passing through the jacket portion 7a and the second water jacket portion 7b, and the coolant passing through the cylinder block 7 along the upward passage 39; The cylinder head exhaust portion 23 is introduced while passing through the exhaust portion water jacket 31. Cooling and outflow along the outflow path 41 is a third step of being pumped by the water pump (11) to the radiator (13) characterized in that the cylinder head intake unit pre-cooling method of the vehicle engine cooling method.