JPS5830117Y2 - Internal combustion engine intake pipe - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an intake pipe for an internal combustion engine.

There is an exhaust gas recirculation device (hereinafter referred to as EGR) that slows down the fuel flow and reduces the amount of nitrogen gas generated by recirculating a portion of the exhaust gas to the intake system.

This EGR is provided with an EGR pulp that controls the amount of recirculation of exhaust gas depending on the operating state of the engine, and also requires a water temperature sensor to detect the operating state of the engine.

On the other hand, heating the intake pipe using the heat of the engine cooling water is also a preferable method because it can further vaporize the fuel, dilute the air-fuel ratio, improve fuel efficiency, and purify gas. .

Due to the above circumstances, the cooling water passage, temperature sensor attached to the cooling water passage, auxiliary equipment such as thermostat,
Various equipment and auxiliary equipment, such as the EGR passage and EGR valve, tend to be concentrated.

Therefore, as described in Japanese Utility Model Application Publication No. 51-118813, there are precedent examples in which EGR pulp is integrally fixed to the suction pipe in order to reduce the size of the structure. The structure does not include temperature sensors and other various equipment.

The present invention provides a suction pipe structure in which these components are integrally attached to the suction pipe to make the suction pipe compact and to effectively heat the suction pipe.

The configuration of the present invention will be described below based on an embodiment shown in the drawings.

In FIG. 1, numeral 1 is a two-cylinder engine, numeral 2 is an intake pipe according to the present invention, and therein is a primary intake passage 3 of a carburetor.
A suction passage 5 communicating with the secondary side suction passage 4 is provided, and the suction passage 5 is bent into a substantially S-shape or L-shape, and the end face 8 of the suction passage 5 is connected to a common suction port for two cylinders in the cylinder head 6. It is connected to 7.

A hot water passage 11 that communicates with the water jacket 10 of the engine is opened in the end face 8, and the hot water passage 11 is located below the extension of the primary side suction passage 3 at the part where the suction passage 5 bends in an S-shape. It consists of a suction passage heating passage 11a passing through, a branch heating passage 11b passing in contact with both sides of the suction passage 5, and a chamber 11C where the branch heating passages 11b merge.

The heating path 11a communicates with the water pump through a pipe 12,
The chamber 11C is equipped with a thermostat 13, connected to a passage 14 to the radiator, and also connected to a bypass passage 15 and a heater passage 35 to the water pump.

Furthermore, a temperature sensor 16 and a thermometer 17 are attached to the chamber 11c.

In addition to the hot water passage 11 described above, the suction pipe 2 also has an E
A GR passage 18 is provided, the EGR passage 18 passes between the branch heating passages 11b, has a cross section that widens toward the end at the exit portion, and communicates with the suction passage 5, and the other end is an EGR passage fixed to the outside of the suction pipe. It communicates with the valve chamber 21 of the pulp 20.

The valve chamber 21 communicates via a valve port 23 with an EGR passage 24 formed within the wall of the suction pipe, and further communicates with an exhaust passage (not shown).

The valve body 25 of the EGR valve 20 is connected to a diaphragm 26 by a rod 27, the diaphragm 26 partitions a negative pressure chamber 28, and is urged by a spring 30 to press the valve body 25 against the valve seat.

The negative pressure chamber 28 is communicated with the suction passage 5 through a pipe 31, and suction pipe negative pressure is introduced. When the negative pressure is high, the diaphragm 26 is displaced and the valve body 25 opens the valve port 23, so that the EG
R is now being carried out.

Further, a secondary air supply pipe 32 is provided for introducing secondary air into the exhaust port via a check valve 33 due to exhaust pulsation in the exhaust passage, and the check valve 33 is connected to the outer wall of the intake v2 by a mounting plate 34. installed.

As mentioned above, the heating passage 11a of the hot water passage 11 is provided along the outside of the extension of the primary suction passage 3 of the carburetor, and the heating passage 11a of the hot water passage 11 is provided along the outside of the extension of the primary suction passage 3 of the carburetor, so that a large amount of the air-fuel mixture flows toward the primary suction passage 3. Can be heated.

Therefore, vaporization of the fuel is promoted, making it possible to dilute the air-fuel mixture, thereby improving fuel efficiency and achieving an exhaust gas purification effect.

Further, since the EGR passage 18 communicates with the common suction passage 5 through an outlet that widens toward the end, mixing with fresh air is evenly performed.

As is clear from the above, according to the present invention, passages such as a cooling water passage and an EGR passage are provided in the wall of the suction pipe, and thermostats, temperature sensors, and the like attached to these passages are further provided.
Equipment such as a thermometer and EGR pulp are also attached to the suction pipe, and because they are integrated, they can be housed in one compact unit, which increases the space in the engine room and makes maintenance easier.

Furthermore, since the air-fuel mixture can be preheated, it is possible to dilute the air-fuel mixture, improve fuel efficiency, and purify exhaust gas.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram of the suction pipe according to the present invention, Figure 2 is a plan view, Figure 3 is a sectional view taken along line A-A in Figure 1, and Figure 4 is B in Figure 1.
5 is a view taken along the line C-C in FIG. 1. 1...engine, 2...intake pipe, 3-
...Primary side suction passage, 4...Secondary side suction passage,
5-... Suction passage, 6... Cylinder head, 7... Suction port, 8... End face,
10...Water jacket, 11...-Hot water passage, 11a,, 11b-=Heating passage, 11C
... Chamber, 12 ... Tube, 13 ...
・Thermostat, 14...Aisle, 15...
... Bypass 1 & 16 ... Temperature sensor, 1
7.--.Thermometer, 18.--.EGR
Passage, 20... EGR pulp, 21...
・Valve chamber, 23...Valve port, 24...EGR
Passage, 25... Valve body, 26... Diaphragm, 21... Rod, 28... Negative pressure chamber, 30... Spring, 31...
Pipe, 32... Secondary air supply pipe, 33...
・Check valve, 34...Mounting plate.

Claims (1)

[Scope of utility model registration request] In the intake pipe that communicates the carburetor with the intake port in the cylinder head, an engine cooling water passage is provided in the pipe wall close to the intake passage, and an EG that communicates with the intake passage is provided.
An intake pipe for an internal combustion engine, characterized in that an R passage is provided in the pipe wall, and a thermostat, a temperature sensor, and EGR pulp attached to the cooling water passage are attached to the intake pipe.