JPS5885320A - Supercharger of 4-cycle engine - Google Patents

Abstract

PURPOSE:To compressively supply air or mixture into an engine combustion chamber, by utilizing a change of pressure in a crank case in accordance with the reciprocating motion of a piston. CONSTITUTION:At full load operation of an engine, the first valve 13 communicates the first passage 11 to an intake port 2 in the first half of an intake stroke to introduce a mixture from the first passage 11 into a combustion chamber 3 of the engine while communicates the second passage 12 to the intake port 2 in the latter half of the intake stroke to introduce a high pressurized mixture compressed in a crank case 9 from the second passage 12. While at partial load operation, the first valve 13 closes the second valve 12 to hold a condition the first passage 11 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a t4 feeder that utilizes compression within the crankcase in the 4-cycle 44@.

As is well known, various types of supercharging devices for internal furnace engines have been proposed.For example, a turbocharger using a bullet turbine, a vane pump or a screw pump Mechanical superchargers have been put into practical use, but these require a large-scale compressor and a seven-sigma feeding mechanism that are installed separately from the engine itself.
Increasing the size of the engine and increasing the titer have the drawback of increasing costs.

This invention compresses and supplies air or air-fuel mixture into the engine combustion chamber by using the pressure f movement in the crankcase accompanying the reciprocating movement of the piston, thereby eliminating the need for a separate compressor as in the E-era conventional systems. [9] Configuration V] This provides a simple supercharging device for a four-stroke engine.

Hereinafter, one embodiment of the present invention will be explained in detail based on the drawings.

Listen to No. 11 A four-cycle machine to which this invention is applied 1sIt shows I7.1 is the engine body, 2 is the combustion chamber 31 of this engine body 1
C through intake valve 4 1. An intake port that communicates with the combustion chamber 3 via an exhaust valve 61, an exhaust boat that communicates with the combustion chamber 3 via an exhaust valve 61,
7 is a carburetor, 8 is an air pump 1J, and the crankcase 9 of the engine body 1 is used to compress the compression effect caused by the reciprocating movement of the piston lO, and to obtain unnecessary The space is removed as much as possible, and the valley cylinders are separated by partition walls (not shown) so that the pressure fluctuations of each cylinder do not interfere with each other. The passage 11 connects the intake port 2 to the carburetor 7, which serves as the inlet of the air-fuel mixture 1i'3. Also 12
d, a second passage connected between the crankcase 9 and the intake port 2;
:Inner passage 1 is located at the confluence part where glycoside 1 and passage 11 merge.
Either 1 or 12? It can be seen that a first valve 13 for selectively communicating with the intake boat 2 is disposed, and a connection portion between the second passage 12 and the crankcase 9). /(rl, a second valve 14 is provided which closes the passages 12 while the piston 10 is rising.

15 has one end connected to the middle part of the passage 11 (which is connected to the first passage on the upstream side of the second passage), and the other end connected to the crankcase 9. A third valve 16 is provided at the connection between the core passage 15 and the crankcase 9 to close the passage 15 while the piston 10 is descending. , a fourth passage 17 F′i is branched from the middle part of the passage 15 of
The passage 17 connects the third valve 16 shown in E. (The passage 17 is connected to the crankcase 9, and the valve 18 of @4 is interposed in the passage.

The valve 13ri of the sugar 1 is, for example, as shown in FIG.
2 and is configured to be driven by an electromagnetic lunoid U via lever Yu. Also, the valve 14 of 7 description 2 and @
The third valve 16 is composed of, for example, a one-way valve using a reed 7F, and when the piston rises, the third valve 16 opens due to the pressure in the crankcase 9, and the piston ′F descends. The second valve 14 is opened at certain times, and the $4 valve 18 is provided to completely release the pressure inside the crankcase 9 when not supercharging, as shown in Fig. 6, for example. A butterfly-shaped valve shown in the figure is used, and this is connected to an accelerator linkage (not shown) via a wire 26, so that the valve closes when the accelerator is fully opened, for example. The operation of the supercharging device having the above configuration will be explained.

First, when the throttle valve of the carburetor 7 is fully open (supercharging+7) is necessary, the first valve 13 is activated by a control circuit (not shown) to close the @1 passage 11 and the intake boat 2 in the first half of the intake stroke. and the second passage 1 in the latter half of the intake stroke.
2 and the intake port 2 are controlled to communicate with each other.
How does this 4 container work? It is shown in Figure 4. Therefore, the air-fuel mixture is introduced into the combustion chamber 3 of the engine from the I@1 passage 11 in the first half of the intake stroke, and the air-fuel mixture is introduced into the crankcase 9 from the second proboscis passage 12 in the second half of the intake stroke. High pressure mixed air is introduced and a supercharging effect is obtained.

On the other hand, during partial loads that do not require supplementary supply, the first valve 1
3 is @2's 4-way 12-cycle 11, 〃h first, Il
11 is fully opened. Figure 5 shows the operation of the 71 containers at this time. Therefore, the combustion chamber 3 is not supercharged and the fourth 111 approximately 17 is opened, so that no unnecessary load is applied to the piston 10, and energy loss is extremely small.

Next, FIG. 6 shows an example of a configuration in which the first valve 13 is mechanically driven, with reference numeral 31 a driving cam that moves in synchronization with the rotation of the engine crankshaft, and 32 a driving cam that is connected via a wire 33. The control cam is linked to the outside accelerator linkage, and the lift current becomes large when the accelerator is fully opened.The cam follower lever is connected to the lever by link 34, and the fulcrum is the above control. -/7 A 321C4 @ It is provided at the tip of the plunger. Therefore, in the illustrated fully open state of the accelerator, due to the action of the 414 mincing cam 31, the valve body n rotates two openings as shown in the imaginary line, opening the second passage 12. On the other hand, When the accelerator is released, the stile and the plunger 37 are driven to the left in the figure, so the valve body 22 remains in the solid line state, meaning that the second passage 12 is not opened and only the first passage 11 is opened. Maintain communication.

In addition, FIGS. 7 and 8 show 0-I as the @1 valve 13.
The t example is shown using II-p<Ruff.

That is, a semicircular passage @at is provided in a cylindrical valve body 41 that rotates synchronously at 1/2 the speed of the engine crankshaft, and v
! The passage part sulfur opens and closes the first passage 11, and the side wall aK of this passage part further includes a fan-shaped notch 44.1-1 A second passage @12 opened to the side of the valve body 41 is cut out. The first passage 11 is opened in the first half of the suction machine, and the second passage 12 is opened in the second half, in the same manner as in the above-mentioned embodiment. Chiru.

Next, Fig. 9 shows an example in which one rotary valve is used as the second valve 14 and the valve 16 at @3. That is, a pair of passage portions 52° 52 are provided in a cylindrical valve body 51 that rotates synchronously at 1/2 the speed of the engine crankshaft, and as the valve body 51 rotates, the second passage 12 and the passage @6 are provided. 15 alternately communicate with the crankcase 9, the sixth passage 15 is open when the piston is ascending, and the second passage 12 is open when the piston is descending.

In the above embodiments, a carburetor system was described, but it goes without saying that this can also be applied to a supercharging #full fuel injection system of the present invention. Even in the case of the t1 carburetor system, the entrance of the sixth passage is placed upstream of the carburetor so that only the air is fully compressed in the crankcase, and when the throttle valve is fully open for supercharging, there is no excess concentration in the combustion chamber from the carburetor. It is also possible to obtain a suitable old mixture ratio (rich mixture) at the stage where the mixture is mixed with the compressed air by feeding 1.

As is clear from the following explanation, the supercharging #ftK of the four-cycle engine according to the present invention utilizes the compression action within the crankcase without providing a special compression → or its axis m. It can efficiently obtain a supercharging effect and is suitable for automatic Tochu 4-stroke engines with limited installation space.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a four-stroke engine to which this invention is applied;
Fig. 2 is an explanatory diagram of the configuration of the first valve, Fig. 6 1 is an explanatory diagram of the column rR of the fourth valve, and Fig. 4- is a time chart showing the operation cap of the container during supercharging. ! 5v1! J#i non-supercharging standby time chart, Fig. 6 is a Jll construction explanatory diagram showing other embodiments of the WGL valve, and Figs. The longitudinal section 1-1 and the cross-sectional view shown in the implementation ψ11, and the cross-sectional view shown in FIG. 2... Intake port, 7... Air intake device, 9... Crank case, 10... Piston, 1
1... 1st 4 o'clock, 12... 2nd 4 o'clock,
13...1st valve, 14...1st valve
2) Masu, 15...6th passage, 16...6th σ
) Valve, 17...Fourth thread path, 18...Fourth valve 0 Fig. 3 To 2~1, +7 ''-'-'- Fig. 4

Claims (2)

[Claims] (1) A first passage connected between the air or mixture inlet and the intake boat, a second passage connected between the crankcase and the intake boat, and the air or mixture inlet. a sixth passage connected between the IE10 passage and the crankcase; a first valve that selectively communicates the IE10 passage and the second passage with the intake boat; A supercharging side 1 of a four-cycle engine comprising a second valve that closes a passage, and a valve @5 that closes the third passage when the piston is lowered. (2) The third passage has a fourth passage branched to communicate with the crankcase through the third valve, and the fourth passage is connected to the crankcase. Claim 1 characterized in that it is configured to be closed when not supercharging.
A supercharging device for a four-cycle engine as described in Section 1.