JPS61106908A - Intake and exhaust mechanism in engine - Google Patents

Abstract

PURPOSE:To simplify an intake and exhaust mechanism, by using a rotary tube to constitute intake and exhaust valves so that resicprocating members may be eliminated. CONSTITUTION:Rotary tubes 8, 9 formed therein intake ports 15 and exhaust ports 16 communicated with associated combustion chambers are laid along a cylinder head, and are communicated with intake and exhaust systems while they are driven by a crank shaft 5 at a predetermined timing so that the combustion chambers are connected with the intake and exhaust systems at a predetermined timing. Accordingly, reciprocating members may be eliminated so that the occupying space and weight of the engine may be reduced, thereby it is possible to simplify the structure of the engine.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention has an extremely simple structure that allows air to be taken into and exhausted from the combustion chamber 11 of a 2-cycle engine and a 4-stroke engine at a speed that is consistent with the engine speed. This invention relates to an engine intake/exhaust mechanism that can always operate properly regardless of elevation.

(Prior Art) For example, in the intake and exhaust mechanism of a four-cycle engine 41, intake pulp and exhaust pulp, which are provided facing the combustion chamber of the engine and include a valve body and a pulp stem, are connected to the crankshaft. Bush rod type, rocker arm type, swing arm type, direct drive type, etc. connect the intake system and exhaust system to the combustion chamber at the same time by reciprocating each other based on the rotational movement of the interlocking camshafts. It has been widely used in the past.

(Problems to be Solved by the Invention) However, in this prior art, two camshafts, a rocker arm, a swing arm, etc. were required to provide reciprocating motion of the intake and exhaust pulp. .

Since a separate pulp spring was required to make the operation of each pulp follow the cam shape, the structure of the intake and exhaust mechanism became complicated, and the space occupied by it became complicated.
There is the problem of increased weight, and the timing of opening and closing of each pulp is adjusted under the action of multiple motor systems.

In particular, as the number of cylinders increases, the proper opening and closing of valves1'
There is a problem in that it becomes difficult to achieve the correct timing, and furthermore, there is a problem in that the inertia of the reciprocating member disturbs the opening and closing timing of the valve as the engine speed increases.

This invention advantageously solves the problems of the prior art, has an extremely simple structure, occupies less space and weight, and can control opening/closing timing without being affected by the number of cylinders, engine speed, etc. To provide an intake/exhaust mechanism for an engine 11 that can be kept properly at all times.

(Means for Solving the Problems) In the engine intake and exhaust mechanism of the present invention, intake and exhaust rotary tubes rotated by the crankshaft are provided adjacent to the combustion chamber 1 of the engine. Further, each rotary tube is provided with an intake port and an exhaust port for communicating the intake system and exhaust system connected to the tube with the combustion chamber at a predetermined timing.

(action)! - In this intake/exhaust mechanism, based on the rotational movement of the intake rotary tube and the exhaust rotary tube connected to the intake system and the exhaust system, respectively, each of them is configured with an intake tube having the following required shape and dimensions. By opening the intake and exhaust ports into the combustion chamber at specific timing and sealing the intake and exhaust ports except when they are opened, it is possible to prevent the intake and exhaust ports from being affected by inertial force and other forces with a simple structure. Without,
Intake and exhaust to and from the combustion chamber can always be performed appropriately.

Here, in order to reduce the influence of the energy loss in the rotary tube, especially in the intake air.

It is preferable that at least one of the inner diameter and the intake port size of the rotary tube is gradually changed in the length direction of the rotary tube.

(Example) The present invention will be explained below based on illustrated examples.

FIG. 1 is a perspective view of a route showing an embodiment of the present invention, and FIG. 8 is a cross-sectional view showing the operating state of the intake and exhaust mechanism shown in FIG. 4 and 8 indicate the entire cylinder block of the four-cylinder gasoline engine, and 8 indicates the piston that slides within the cylinder block 8, respectively.
These pistons 8 are connected to the crankshaft 5 via connecting rods.

As is clear from the tx and gg diagrams, for example, the engine An intake rotary tube 8 connected to an injection pump (not shown) on the rear side of the engine 1, and an exhaust rotary tube 9 connected to a muffler (not shown) on the rear side of the engine 1, respectively, are connected to the combustion chamber 7. A toothed pulley or equivalent toothed means 1 is provided at one end of these rotary tubes 8.9.
2. Fix 18 respectively, and 2. Then, a winding means (not shown), such as a timing belt or a timing chain, is meshed with these toothed means 12 and 18, and is then directly connected to another toothed means 14 fixed to one end of the crankshaft 6, for example. The rotary tubes 8 and 9 rotate once for every two revolutions of the crankshaft b.

Further, each of the rotary tubes 8 and 9 has an intake port 16 and an intake port 16 that open into the combustion chamber 7 at a predetermined timing in relation to the rotation angle of the crankshaft 6, or in other words, the position of the piston 8 in the four cylinder tubes. Exhaust ports 16 are provided and connected to the respective rotary tubes 8.9, allowing the intake and exhaust systems to communicate with the combustion chamber 7 only when they are opened. Note that engine 1 here is 4
1), these intake ports 16 and exhaust ports 16 are respectively provided at positions corresponding to each cylinder of each rotary tube 8.9, and the intake ports 15.15 and exhaust ports adjacent to each other are provided at positions corresponding to each cylinder. The openings 16.16 are displaced by a predetermined angle υ in the circumferential direction of the respective tubes 8.90.

In addition, in the figure, 17 and 18U respectively show casings fixed to the cylinder head 6, and these casings 17,
18 [, due to the cooling water flowing through the water jacket,
It acts to cool the rotary tubes 8 and 9 housed inside. Here, in order to effectively prevent leakage of intake and exhaust air from the combustion chamber 7 to undesired parts, it is necessary to install seals that directly contact the outer peripheries of the rotary tubes 8 and 9 at least at the intake and exhaust port positions. Material 19. BO, Keishin I
It is preferable to provide the intake and exhaust ports 16,16 in the combustion chamber 7 so that the intake and exhaust ports 16,16 can open only to the combustion chamber 7.

In the intake/exhaust mechanism □ structure configured in this way, the rotary tube hoop 8 is based on the crankshaft 50 rotation movement.
．． 9 are rotated in synchronization with each other, and in the suction process of the - piston 8 as shown in Fig.
6 is the combustion chamber? The combustion chamber 7 is opened from the intake port 15 to the combustion chamber 7.
The air-fuel mixture is sucked into the Note that at this time, the exhaust port 16 is closed to the combustion chamber 72.1. Next, in the compression stroke after the piston 8]1, the intake and exhaust ports 15 and 16 are completely closed to the combustion chamber 7, as shown in the 21st expansion), so that the air-fuel mixture 1 is completely closed. Compression takes place. Furthermore, in the subsequent explosion stroke, i
As shown in Figure 2 (0), the compressed air-fuel mixture expands during combustion due to the spark from the spark plug z1 while the intake and exhaust ports 15 and 16 remain closed to the combustion chamber 7. aFi receives that energy and descends, imparting rotational energy to the crank shirt) 51... Finally, in the exhaust process of the piston 8, the exhaust port 16 opens to the combustion chamber 7, as shown in FIG. There will be a discharge.

Therefore, according to this suction/exhaust rate mechanism, the suction/exhaust port 16.16
□ Modified Tube 8.9 with .

Intake and exhaust can be performed by rotationally driving a position adjacent to the combustion chamber 7 of the engine 1, and there is a reciprocating 1
/ Since there is no Ib member, the intake and exhaust air flow is 16.1 degrees per day without being affected by the number of cylinders, engine rotation speed, etc.
6 can always be properly opened and closed with respect to the combustion chamber 6, so that problems such as those in the prior art do not occur.

Although the present invention has been described above in the case where it is applied to a four-stroke gasoline engine, it goes without saying that it can also be applied to a two-stroke gasoline engine, a diesel engine, and the like.

(Effect of the invention) According to this invention, the intake port II--
By installing the rotary tube and the exhaust port, the rotary tube for the next exhaust can be rotated in relation to the crankshaft to intake and exhaust air into the combustion chamber. ! This simplifies the structure of the air mechanism and effectively reduces the space and weight it occupies.In addition, the cam and the reciprocating members operated by it, which require high machining accuracy, are Since it is not necessary at all, it fully prevents intake and exhaust timing errors caused by increases in the number of cylinders and engine speed. 2.

can do.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a route showing an embodiment of the present invention. FIG. 2 is a sectional view showing the operating state of the intake and exhaust mechanism shown in FIG. 1 with respect to the - piston.・l...Engine? ...Combustion chamber 8.9...Rotary tube 16...Intake port 16...Exhaust port

Claims (1)

[Claims] 1. Rotary tubes for intake and exhaust that are placed adjacent to the combustion chamber of the engine and are rotationally driven, and the intake system and exhaust that are provided on these rotary tubes and connected to each tube. An engine intake/exhaust mechanism comprising an intake port and an exhaust port that communicate the system with a combustion chamber at a predetermined timing.