JPS618457A - Internal-combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Field of Application The present invention is provided with a cylinder head having a combustion chamber and an intake port connected to the combustion chamber. This invention relates to an internal combustion engine equipped with an intake manifold that communicates with the engine.

(2) Prior Art Conventionally, in this type of internal combustion engine, in order to facilitate the casting of the intake manifold, it has been divided into at least two parts.
The mounting surface of the intake manifold to the cylinder head is
(For example, Japanese Patent Application Laid-Open No. 54-7402
(Refer to Publication No. 1) Therefore, when machining the intake manifold, the mounting surface to the cylinder head and the joining surface of the two parts must be cut separately.

(3) Problems to be solved by the invention By the way, when the intake manifold is divided into at least two parts,
If the joint surface of the part and the mounting surface of the intake manifold to the cylinder head could be cut at the same time with the same tool, it would be convenient because the high precision machining of the joint surface and the mounting surface could be completed in one process. be.

The present invention has been proposed in response to such demands, and an object of the present invention is to provide the internal combustion engine that can improve the machining efficiency and machining accuracy of the intake manifold.

B1 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides an intake manifold with an upper half attached to a cylinder head, and an attachment of the upper half to the cylinder head. It is characterized by comprising a lower half part that is bonded to the upper half part with a joint surface that is flush with the surface.

(2) Effect According to the above configuration, the joint surface of the upper half of the intake manifold with the lower half, and the attachment of the upper half to the cylinder head.
The surface can be cut with high precision in one process using the same tool.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

The internal combustion engine shown in FIG.
Cylinder 1 is connected to the crankshaft for three cylinders (
(not shown) are arranged in the axial direction (front and back direction in FIG. 1).

Since the structures of both cylinder rows C,,C, are almost symmetrical,
To explain only the structure of the right cylinder row C2, a cylinder head 3 is superimposed and bonded to the upper surface of the cylinder block 2 in which the cylinders 1 are formed via a gasket 4. A piston 5 is slidably connected to the cylinder 1, and a combustion chamber 6 is formed on the bottom surface of the cylinder head 3 facing the piston 5.
is recessed.

The ceiling surface 7 of the combustion chamber 6 has two slopes 7 that descend toward both left and right sides from a ridgeline extending in the direction in which the three cylinders 1 are arranged.
a, 7b (see Figure 1A), and a pair of intake valve ports 8, 8 are located on the slope 7a located on the valley V side between both cylinder rows C, , CZ, and on the slope 7b on the opposite side. Similarly, a pair of exhaust valve ports 9.9 are opened side by side along the ridgeline.

These intake valve ports 8.8 and exhaust valve ports 9.9 are connected to the valve mechanism 1.
The air intake valves are opened and closed by each pair of intake valves 11.11 and exhaust valves 12.12, which are driven by the intake valve 11.11 and the exhaust valve 12.12, respectively. A single point surrounded by these four valves 11, 11; 12, 12, a pillar of fire 1
3 is screwed onto the cylinder head 3, and its electrode is connected to the combustion chamber 6.
It faces the center of the ceiling surface 7 of.

Each pair of intake valve ports 8, 8 and exhaust valve ports 9, 9 are connected to a common intake port 14 and an exhaust port 15, respectively,
The inlet of the intake port 14 opens on the upper surface of one side of the cylinder head 3 adjacent to the valley V, and the outlet of the exhaust port 15 opens on the other side of the cylinder head 3.

In FIG. 2, the three intake ports 14 of the left cylinder row C3 are arranged in order from above. Second. Third intake port 14
．． ．． 14□, 143, and the three intake ports 14 of the right cylinder row C2 are numbered 4. Fifth. These will be referred to as sixth intake ports 144, 145, and 146. An intake manifold M for distributing and supplying air or air-fuel mixture to these intake ports is arranged along a valley V between both cylinder rows C, CZ.

As shown in FIGS. 2 to 10, the intake manifold M has the first to sixth intake bows)], 4. 1st to 6th low-speed intake passages 161 to 16 connected to the inlets of 146, respectively.
6, and in parallel with these low speed intake passages 161 to 166, the first to
14+ to 146, respectively, are connected to the inlets of the first to sixth high-speed intake passages 17. ~176, and the first to sixth low speed intake passages 16. -166 inlets a, -a6 have a common first intake chamber 18. , a common second intake chamber 18 □ in which the inlets of the first to sixth descendant air intake passages 171 to 176 are open, and both intake chambers 18 . ．． 18 □ first and second communication passages 19 which communicate in parallel. .

19□ and the first and second communication passages 19. , 19□, and the first to sixth high-speed intake passages 17. The first to sixth sub-opening/closing valves 21. ~216.

Thus, the cross-sectional area of each high-speed intake passage 171-176 is set larger than that of the corresponding low-speed intake passage 161-166. Each intake port 14 also communicates with each other. The total length of ~146 and the low-speed intake passages 16 and ~166 is the first length that can maximize the charging efficiency in the low-speed operating range due to the intake inertia effect.
The intake port is set to a length Ll and communicates with each other) 14
The total length of the high-speed intake passages 1 to 146 and the high-speed intake passages 171 to 176 is set to a second length L2 that can maximize the charging efficiency in the high-speed operation range due to the intake inertia effect. Therefore, this second length L2 is set to be sufficiently shorter than the first length Ll.

In addition, the first and second communication passages 19° and 19□ are connected to each high-speed intake passage 17. It is formed thicker and shorter than ~176.

In order to facilitate processing, assembly, maintenance, etc., the intake manifold M is disposed in the valley V between both cylinder rows CI and C2, and is fitted with a plurality of bolts 22. 22... to the cylinder heads 3 of both cylinder rows C, C2.
block B, and the third and sixth intake ports 14 of valley V;
23.2 (Multiple poles arranged on the outside of the 3,146 side)
The second block B2 is connected to the first block B1 by 3... and the second block B2 is connected to the lower surface of the first block B1 at the valley V by a plurality of bolts 25, 25, with the valve support plate 24 in between. It is divided into a third block B3.

Thus, the first and second blocks B+ and Bz constitute the upper half Mu of the intake manifold M, and the valve holding plate 24 and the third block Bz constitute the upper half Mu of the intake manifold M.
The block B3 constitutes its lower half Mj2, and the joint surface F1 of its upper half Mu with the lower half Mj2, that is, the joint surface F1 with the valve support plate 24 of the first block B, and the upper half Mu A pair of mounting surfaces Fz, Fz to both the left and right cylinder heads 3, 3
and are placed flush with each other.

Said first to third high-speed intake passages 17. 173 and the fourth to sixth high-speed intake passages 174 to 176, as shown in FIG. It is formed across block B3, and the first to sixth low-speed intake passages 16I
166 are formed across the first and second blocks B+ and Bz so as to pass above each of the high speed intake passages 171 to 17, and the first intake chambers 18. is formed in the second block B2, and the second intake chamber 18□ is elongated so as to span almost the entire length of the valley (formed in the third block B3, and the first and second communication passages 19...192 are formed in the first block B1, and the first and second main on-off valves 20..20□ and the first to sixth auxiliary on-off valves 21, to 216 are pivotally supported on the valve support plate 24.Thus, All low speed intake passages 161 to 166,
Full high speed intake passage 17. 173 and the second intake chamber 18□ are arranged in the valley V between both cylinder rows C,,C, and the first intake chamber 18. only is arranged outside the valley V.

As described above, when the second intake chamber 18□ is formed to have a length that spans approximately the entire length of the valley V, the acid chamber 18□ is connected to the first to sixth intake ports 14. The first to sixth high-speed intake passages 171 communicating with ~146
~176 lengths can be made exactly equal.

The first to sixth low-speed intake passages 161 to 166 are connected to the first intake chamber 1
These low-velocity intake passages 16 . ~16
6 to have approximately equal length, the corresponding intake ports 141 to 14
6. Each low speed intake passage depending on the distance up to 16. The opening positions of the inlets a1 to a6 of 166 to the first intake chamber 181 are selected.

First intake chamber 18. As described above, is defined by the corrugated inner circumferential wall 26 of the six low-speed intake passages 161 to 166 surrounding these, which are connected to each other, and the closing wall 27 which is connected to one end of the inner circumferential wall 26.

In this way, the first intake chamber 18. There is no need to provide a special box for forming the structure, and the structure is simple.

First intake chamber 18. The other end is opened as an inlet 28, and an intake air amount control device 29 for adjusting the amount of intake air or air mixture is attached to this inlet 28.

The valve support plate 24 has a pair of left and right valve shafts 30 extending parallel to a crankshaft (not shown). ．． 30□ is rotatably supported, and the first main on-off valve 20+ and the fourth to
Sixth auxiliary on-off valves 214 to 216 are attached, and the second main on-off valve 20.2 and the first to third auxiliary on-off valves 21.2 are attached to the right valve shaft 30□. ~213 is attached.

As shown in FIG. 1, both valve shafts 301, 302 are each provided with an actuating lever 3'11, 312 at its outer end, and these actuating levers 31+, 31z are interconnected via an interlocking link 32. The actuator 33 is connected to the actuator 33 . This actuator 33 normally holds the full open/close valve in a closed position, and opens the full open/close valve in response to the engine reaching a predetermined high rotational speed state.

Various types of actuator 33 can be adopted, such as a negative pressure type and an electromagnetic type, but in the case of a negative pressure type, an engine is used.

It is desirable to configure the fully open/close valve to be closed by the boost negative pressure and opened by the spring force.

In addition, 34 in the figure is an air cleaner of the intake air amount control device 29;
5. ~356 are each intake port 14. These are combustion injection nozzles mounted on the intake manifold M so as to face 146, and these nozzles are of course unnecessary when the intake air amount control device 29 is used as a carburetor.

Next, the operation of this embodiment will be explained. When the engine is operating at low speed, the actuator 33 is in an inactive state, and all of the main and sub-opening valves 20. ,．． 20. ; 211 to 216 are closed, and the entire high-speed intake path 17. ~176 and the first
and the second intake chamber 181° and 18□ are disconnected from each other.

Therefore, the intake air amount control device 29
The air or mixture that has been reduced in weight and taken into the first intake chamber 18□ is transferred to the acid chamber 18. to the first to sixth low-speed intake passages 16. ~
166 and the first to sixth intake ports 14. ~14
6 and is sucked into the corresponding cylinder 1.

Therefore, as mentioned above, each intake port 1 communicating with each other
41-146 and low speed intake passage 16. The total length of ~166 is set to a relatively long first length Ll that can maximize the charging efficiency due to the intake inertia effect during low-speed operation of the engine, so it is possible to satisfy the low-speed output performance of the engine. can.

When the engine enters a predetermined high-speed operating state, the actuator 33 operates to open the main and sub full open/close valves 20. ;2Q□ ;21, ~216
Open the valve and 1st. Second intake chamber 18. .

182 and the first to sixth high-speed intake passages 17
．． ~17. conduct each. Then, during the intake stroke of the engine, the air or air-fuel mixture sucked into the first intake chamber 181 from the intake air amount control device 29 is immediately transferred to the first intake chamber 181. 2nd communication 1
19. ．． ．． 19□ to the second intake chamber 18□, and is distributed into the first to sixth high-speed intake passages 17. The air is sucked into the corresponding cylinder 1 through the sixth intake ports 141 to 146.

Therefore, as mentioned above, each of the 1st to 6th parts communicating with each other
Intake port 14. ~14. and the first to sixth high-speed intake passages 1
The total length of 71 to 1760 is set to a relatively short second length L2 that can maximize the filling efficiency due to the intake inertia effect during the predetermined high-speed operation of the engine, so it satisfies the engine's cavity output performance. can be done.

Moreover, during low-speed operation, the first and second main on-off valves 201, .
By closing the valve 20□, the second intake chamber 182 is stopped and the first intake chamber 182 is stopped.
Intake chamber 18. Only the first to sixth low-speed intake passages 161 to 16
6, and is used as an ambidextrous on-off valve 20. during high-speed operation. ,20□
By opening the valves, the air chambers 181.18□ of both eyes are connected to the first to sixth high-speed intake passages 17. ~176, so all intake chambers 18
．． ．． The effective volume of 182 is automatically controlled to be small during low-speed operation and large during high-speed operation. Therefore, in the low-speed driving range, it is possible to stabilize idling and improve the acceleration from idling, and in the high-speed driving range, each high-speed intake passage can be operated as desired without being interfered with by the intake pulsation of other high-speed intake passages. Since the intake inertia effect can be exerted, the output of the engine can be reliably improved.

Furthermore, if the total volume of the first and second intake chambers 181.18□ is set to perform resonance supercharging in the desired high-speed operating range of the engine, the charging efficiency will further increase and the engine output will be further improved. be able to.

In the above embodiment, two main on-off valves 20. ．． 20° was used, but the rain aeration room 18. , 18□, the number of main opening/closing valves can be reduced to one if the communication path between them is made larger.

In the intake manifold M, the joint surface F1 of the first block B1 with the valve support plate 24, and the pair of mounting surfaces Fz, Fz of the first block B to the left and right cylinder heads 3, 3.
are arranged on the same plane, so the above three planes F'+ , Fz ,
By cutting Fz all at once with the same tool, it is possible to improve the machining efficiency and machining accuracy of the intake manifold M.

C9 Effects of the Invention As described above, according to the present invention, the intake manifold has an upper half that is attached to the cylinder throat, and a joint surface that is flush with the attachment surface of the upper half to the cylinder head. The joint surface of the upper half of the intake manifold with the lower half and the mounting surface of the upper half to the cylinder head can be easily assembled using the same tool. It can be cut during the process, and can greatly contribute to improving the machining efficiency and machining accuracy of the intake manifold.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical sectional front view of the main parts of the entire ■ type child cylinder internal combustion engine, FIG. 1A is a bottom view of the cylinder head of the engine shown in FIG. 1, and FIG. is a plan view of the main part of FIG. 1, FIG. 3 is a side view of the intake manifold of FIG. 1, and FIGS. 4, 5, and 6 are IV-IV lines and v-v lines of FIG. 2. and ■-■ line sectional view, Figures 7, 8, and 9
Figures and Figure 10 are the ■-■ line, ■-■ line, and IX of Figure 3.
- It is a sectional view taken on the line IX and the line XX. c,,CZ...Left 5 right cylinder row, F...Joint surface, F2...Mounting surface, M...Intake manifold, M
U...Upper half, Mi...Lower half Patent applicant Honda Motor Co., Ltd. Figure 9 M Figure 8

Claims (2)

[Claims] (1) A cylinder head is provided with a combustion chamber and an intake port connected to the combustion chamber, and this cylinder head includes:
In an internal combustion engine equipped with an intake manifold that communicates with the intake port, the intake manifold is connected to an upper half portion that is attached to a cylinder head, and a joint surface that is flush with a mounting surface of the upper half portion to the cylinder head. 1. An internal combustion engine comprising: a lower half portion connected to the lower half portion. (2) In the internal combustion engine according to claim (1), the engine is a V-type engine having two cylinder rows arranged in a V-shape, and the intake manifold is located between the two cylinder rows. An internal combustion engine that is arranged in a valley and mounted on the mounting surfaces of the cylinder heads of both cylinder rows that are flush with each other.