JPS6026145A - Cylinder head for engine - Google Patents

Abstract

PURPOSE:To maintain the temperature increase of intake-air in an intake-air passage to be small to aim at enhancing the volumetric efficiency, by providing partition walls respectively defining a water chamber surrounding the intake-air passage and a water chamber surrounding an exhaust passage in a cylinder head, with through-holes communicating between both chambers. CONSTITUTION:A cooling water reservoir 43 in a cylinder head is provided therein with partition walls 41, 42, and is therefore, divided into an intake-air side cooling water reservoir 43 surrounding an intake-air passage 34 and an exhaust side cooling water reservoir 44 surrounding an exhaust passage 35. There are provided, in the partition walls 41, 42, holes 45, 46 through which cooling water having at first flown into the intake-air side cooling water reservoir 43 from a cooling water communication hole 23 enters into the exhaust side cooling water reservoir. As a result, the water temperature of the intake-air side reservoir 43 is made lower, thereby the volumetric efficiency increases.

Description

[Detailed description of the invention] The present invention relates to an engine cylinder head.

FIG. 1 shows a conventional engine cooling water system'x. The crankcase 11 has a liner 12f for supporting and a cylinder head 13ff at the top.

A piston 14 slides on the inner surface of the liner 12. A combustion chamber 15 is formed by the cylinder liner 12, cylinder liner 13, and piston 14. The cooling water discharged from the cooling water pump P21 driven by the crankshaft is supplied to the crankcase II.
and a cooling water jacket 22 formed by the cylinder liner 12.
The water enters the lower part of the cylinder liner 12 to cool the outer surface of the cylinder liner 12, and enters the cooling water reservoir 24 of the rad 13 from the communication hole 23 in the upper part to the cylinder.

Further, the cooling water is passed from the cooling water outlet pipe 25 provided at the upper part of the cylinder rad 13 to the piping 26 to the thermostat) V2.
It reaches 7. A portion of the water from thermostat V27 passes through radiator R28 and pipe 29, and the remainder passes through three bypass pipes and directly reaches the suction port of cooling water pump P21. FIG. 2 shows a cross section of the cylinder head 13 taken along the line 1-2. cylinder head 1
An intake valve 31.3 is provided on the surface in contact with the combustion chamber 15. Exhaust valve 32
The combustion injection valve 33 is connected to the intake valve 31, and the exhaust valve 32 is connected to an intake passage 34 and an exhaust passage 35, respectively. The intake passage 34 and the exhaust passage 35 are provided in a common cooling water reservoir 24.

Next, the operation of the conventional example will be explained.

The cooling water from the cooling water pump P21 cools the outer surface of the liner 12 in the cooling water jacket 22 to raise its temperature, and then cools the surface in contact with the combustion chamber 15 within the cylinder head 13, increasing the humidity.

By the way, as shown in FIG. 2, the intake passage; 34 and ν1
The air passageway; 35←1 is installed in the common cooling water reservoir 24 within the cylinder. Here exhaust passage 3
High temperature exhaust gas flows out from the combustion chamber 15 via an exhaust valve 5 and 32. Therefore, the wall surface of the exhaust passage 35 becomes high in temperature, and the cooling water in the cooling water reservoir 24 is further heated.

As a result, the temperature of the cooling water in the cooling water reservoir 24 further increases by this amount, and the intake passage 34 in the common cooling water reservoir 24 is heated by this high temperature cooling water.

The temperature of the intake air in the intake passage 34 is normally determined by the cooling water pump P21.
Since the temperature of the coolant discharged from the liner 12 is lower than that of the liner 12, the intake air in the intake passage 34 is heated.
The amount of heat obtained by cooling the combustion chamber 15 of the cylinder head 13
The temperature of the cooling water is increased by the amount of heat obtained by cooling the surface in contact with the exhaust passage 35, and the amount of heat obtained by heating the wall surface of the exhaust passage 35 in the cylinder head 13.

As a result, the density of the intake air that is drawn into the combustion chamber 15 through the entire intake valve 31 decreases, and the volumetric efficiency deteriorates, causing combustion deterioration such as an increase in smoke concentration.

The purpose of the present invention is to solve the above problems and improve intake efficiency.
Second, it is equipped with Ennon cylinder heads designed to improve combustion.

The cylinder head of the engine according to the present invention is provided with a partition/wall that divides the cooling water reservoir in the cylinder head into a cooling water reservoir surrounding the exhaust passage and a cooling water reservoir surrounding the intake passage,
Further, a hole is formed in the partition wall, and through this hole, cooling water flows from the cooling water reservoir surrounding the intake passage to the cooling water reservoir surrounding the 411 air passage, so as to achieve the above object. Dechiru.

Embodiments of the Ennon cylinder head according to the present invention will be described below with reference to FIGS. 3 to 5.

FIG. 3 shows a sectional view of the cylinder head 4o of the present invention.

FIG. 3 is a sectional view of the conventional example at a position corresponding to FIG. 2. Partition walls 4.1 and 4-2 are provided in the cooling water reservoir 43, and the intake side cooling water reservoir 43 surrounding the intake passage 34 and the exhaust passage 3 are connected to each other.
5 is divided into an exhaust side cooling water reservoir 44 surrounding the exhaust side cooling water reservoir 5. Furthermore, 11; 1 wall 41. , 4.2 has a hole 4.5 for cooling water to flow through.
．． 46 is provided. The engine cooling water system of the present invention is shown in FIG. 4 by a cross section taken along the line ■--■ in FIG.

The cooling water from the cooling water reservoir 22 passes through the communication hole 23 and first enters the intake side cooling water reservoir 43 of the cylinder head 40. Next, the holes 4 made in the partition walls 4], 42 shown in FIG.
The cooling water flows into the air control side cooling water reservoir 44 through 5 = 46, and flows out to the piping 26 from the cooling water outlet pipe 25 attached to the second part of the exhaust side cooling water reservoir 44. The flow of cooling water beyond that point is the same as that of the conventional Ennon shown in Fig. 1.

Next, the operation of the above embodiment will be explained.

As shown in FIG. 3, the cooling water first flows from the cooling water communication hole 23 into the intake side cooling water reservoir 43, and then passes through the hole 45946 and enters the exhaust side cooling water reservoir 44. In this exhaust side cooling water reservoir 44, the cooling water is heated by the high temperature wall surface of the exhaust passage 35, and the water temperature rises by 1. It flows out of the cylinder head 40 through.

Further, since the surface of the cylinder head 40 in contact with the combustion chamber 15 is almost equally divided into an intake side cooling water reservoir 43 and an exhaust side water reservoir 44, the cooling water in the intake side cooling water reservoir 43 is transferred to the cylinder head 40.
The amount of heat generated by cooling the surface in contact with the combustion chamber 5 is approximately 1'.

Therefore, the cooling water in the intake side cooling water reservoir 43 has a temperature corresponding to the amount of heat obtained by cooling the cylinder liner 12 and the amount of heat obtained by cooling the surface of the cylinder head 40 that is in contact with the combustion chamber 15, which has been reduced by approximately the cliff. , so the temperature rise is smaller than in conventional engines. As a result, the increase in the temperature of the intake air in the intake passage 34 is reduced, the volumetric efficiency is improved, and engine performance such as increased output is achieved.

What is shown in FIG. 5 is a second embodiment, in which a cylinder head 40
The structures of the partition walls 41, 42 and the holes 45, '46 are the same as those of the first embodiment V/11 shown in FIG.
At the same time, a part of the cooling water discharged from the pump P21 is branched before flowing into the lower part of the cooling water jacket 22, and a pipe 5I connects the cylinder head 10 with the connecting hole 23.
The cooling water flows into the cooling water population 52 at the lower part of the intake side cooling water reservoir 43. At this time, the communication hole connecting the cooling water outlet 22 and the intake cooling water reservoir 4; 3 is abolished.

Next, the operation of the second embodiment will be explained.

The cooling water that completely cooled the outer surface of the liner 12 with the cooling water jacket 22 flows from the communication hole 2;) to the illumination side 7' near cooling water reservoir 44.
flows into. More cooling water, I? Approximately half of the cooling water branched from the pump P21 flows directly into the cooling water reservoir 1:3 on the intake side from the cooling 7J (population 52, hole/I 5 , 4 G f
The cooling water flows through the cooling water reservoir 44 on the exhaust side, merges with the cooling water from the communication hole 23 , and then flows out from the cooling water outlet pipe 25 .

In the second embodiment as well, the cooling water heated in the exhaust side cooling water reservoir 44 does not come into contact with the wall surface of the intake passage 34. In addition, the cooling water in the intake side cooling water reservoir 43 is heated by the shilling head 40.
The amount of heat obtained by cooling the surface in contact with the 1L chamber 15 is approximately halved.

The amount of heat obtained by the cooling water in the intake side cooling water reservoir 43 and 1'i' is reduced to about half, and only the amount of heat obtained by cooling the surface metal in contact with the combustion chamber 15 of the do 40 is reduced by a)), so the flow rate is halved. Even if the temperature becomes smaller than that of the conventional ennon, the amount of heat absorbed by the Schilling liner l2r'13'r) decreases.

As a result, the temperature rise of the intake air in the intake passage 34 is reduced, volumetric efficiency is improved, and engine performance is improved.

[Brief explanation of the drawing]

Figure 1 Q'', Conventional Ennon cooling water system diagram, Figure 2
The figure is an lI-I+ sectional view of FIG. 1, and FIGS. 3 to 5 are cross-sectional views equivalent to FIG.
Fig. 4 is a diagram of the water cooling system of the Ennon of the present invention including the IV-IV sectional view of Fig. 3 in the first embodiment, and Fig. 5 is the FIG. 3 is a diagram of the cooling water system of the engine of the present invention, including a sectional view taken along the line IV. 34... Intake passage, 35... Exhaust passage, 41, 42
...Bulkhead, 11:3...Intake side 1"l) Cooling chamber, -
i, i...1 air side cooling water chamber, ll 5, 4 G.
...i1'r+hole. 271 FJ1 Figure 43 33 4 (J 31 Figure 4 Figure 5

Claims (1)

[Claims] A partition wall is provided to partition an intake side cooling water chamber surrounding the intake passage of the cylinder head and an exhaust side cooling water chamber surrounding the exhaust passage, and a through hole is further provided in the partition wall to communicate the two cooling water chambers. cylinder head of an engine.