CN1084435C - Air suction apparatus for internal combustion engine - Google Patents

Abstract

An air intake device for an internal combustion engine, the mixed gas inlet and outlet branch pipe does not need to be longer than necessary, the installation freedom of the air intake chamber is large, and the interference with the vehicle body can be avoided. Its structure is as follows: on the suction passage 22a downstream of the throttle valve, the mixed gas inlet and outlet branch pipe 22d is branched, and the branch pipe 22d is connected to the suction chamber 30, and its characteristic is: the air connected to the upstream side of the aforementioned throttle valve A suction chamber 30 is provided on the filter cover 26 .

Description

Aspirator for internal combustion engines

The invention relates to an air intake device with an air intake chamber in an internal combustion engine.

The air intake device of the known prior art is to use the pressure fluctuation of the air intake channel to introduce the mixed gas into the air intake chamber by connecting the air intake chamber to the branch pipe branched from the air intake passage downstream of the throttle valve. And the mixed gas introduced into the suction chamber merges with the mixed gas flowing in the suction passage and is discharged into the cylinder, so that the suction flow is smooth and the suction efficiency is improved.

In the example described in Japanese Unexamined Patent Publication No. 3-51162, the air intake chamber is mounted on a swing unit of a motorcycle having a unit swing internal combustion engine.

In the same example, the suction pipe extends from the gasifier-side suction port of the crankcase of the two-cycle internal combustion engine provided at the front of the rocking unit and is connected to the gasifier.

And the mixed gas inlet and outlet branch pipe is branched upwards from the suction pipe and connected to the suction chamber, and the suction chamber is fixed on the shield with rivets, and the shield covers the cylinder that is erected from the crankcase.

For the unit shaking internal combustion engine, because the internal combustion engine is arranged near the shaking center, there is little margin between the shield covering the same internal combustion engine cylinder and the upper body, so the suction chamber installed on the same shield cannot obtain too much Large volume.

If you want to ensure that the suction chamber has a volume above the exhaust volume, the suction chamber of this volume must be located on the mixed gas inlet and outlet branch pipe that branches upward from the suction pipe, and its highest position is higher than the shield. The interference of the suction chamber, which rocks with the rocking unit, with the bodywork above it is problematic.

The present invention is made in view of the above-mentioned problems, and an object of the present invention is to provide an internal combustion engine that does not need to make the air-fuel mixture inlet and outlet pipes longer than necessary, has a large degree of freedom in the installation of the air intake chamber, and can avoid interference with the vehicle body. Aspirator.

In order to achieve the above-mentioned purpose, the air intake device of the internal combustion engine of the motor motorcycle of the first technical solution adopted by the present invention branches off a mixed gas inlet and outlet branch pipe on the air intake passage downstream of the throttle valve, and connects to the branch pipe. The air intake chamber is characterized in that the air intake chamber is provided on an air cleaner cover connected to the upstream side of the throttle valve provided in the carburetor.

The second technical solution adopted by the present invention is: in the air intake device of the internal combustion engine described in the first technical solution, the aforementioned air intake chamber and the aforementioned air cleaner cover are overlapped and set when viewed from the side.

The third technical solution adopted by the present invention is: in the air intake device of the internal combustion engine described in the first technical solution, the aforementioned air intake chamber is arranged on the upper part of the aforementioned air cleaner cover.

The fourth technical solution adopted by the present invention is: in the air intake device of the internal combustion engine described in any one of the first technical solution to the third technical solution, the aforementioned air intake and the aforementioned air cleaner cover are independently take shape.

The fifth technical solution adopted by the present invention is: in the air intake device of the internal combustion engine described in any one of the first technical solution to the third technical solution, the aforementioned air suction chamber and the aforementioned air cleaner cover made into one.

The sixth technical solution adopted by the present invention is: in the air intake device of the internal combustion engine described in any one of the aforementioned first technical solution to the fifth technical solution, the aforementioned internal combustion engine is integrally provided with a power transmission at its rear The device is a unit that is supported freely on the vehicle body to swing the internal combustion engine, and the aforementioned air cleaner is arranged on the top of the swing unit.

According to the first aspect of the present invention, because the mixed gas inlet and outlet branch pipe is branched from the intake passage downstream of the throttle valve, and is connected to the intake chamber on the air cleaner cover arranged on the upstream side of the throttle valve. , so if the throttle valve is bypassed, the pipe length can be set to be short, and there are many places that can be arranged on the air cleaner cover, and the freedom of installation is large.

Furthermore, since the air cleaner cover is installed at a position away from the center of the swing even when it is applied to a unit shaking internal combustion engine, there is a surplus space between the vehicle body and installation on the air cleaner cover can be easily avoided The suction chamber interferes with the car body.

According to the second technical solution of the present invention, it is not possible to protrude above the air cleaner, and interference with the vehicle body can be avoided.

Furthermore, the air cleaner cover for the intake chamber can be hidden, and the appearance quality can be improved.

According to the third technical solution of the present invention, the installation freedom of the suction chamber on the air filter cover is large, and the mixed gas inlet and outlet branch pipes are set to be short, and the interference with the vehicle body is avoided, and it can be arranged on the air filter cover. The upper part of the cleaner cover.

According to the fourth aspect of the present invention, since the suction chamber is provided on the highly rigid air cleaner, it is securely fixed.

The suction chamber is easy to maintain and replace individually.

According to the fifth aspect of the present invention, the number of parts is small, and the assembly work is easy.

According to the sixth aspect of the present invention, in the unit swing internal combustion engine, the air intake chamber can be provided on the air cleaner.

Fig. 1 is an overall side view of a motorcycle according to an embodiment of the present invention.

Fig. 2 is a partially cutaway side view of the rocking unit.

Figure 3 is a top view of the same rocking unit.

Figure 4 is a side view of the shroud.

Figure 5 is a top view of the same shroud.

Fig. 6 is a side view of the suction pipe member.

Fig. 7 is a plan view of an air intake pipe member.

Fig. 8 is a rear view of the suction pipe member.

Fig. 9 is a left sectional view of the air cleaner cover.

Figure 10 is a top view of the same air cleaner housing.

Fig. 11 is a sectional view taken along line XI-XI in Fig. 9 .

Fig. 12 is a side view of the suction chamber.

Figure 13 is a top view of the same suction chamber.

Figure 14 is a front view of the same suction chamber.

Fig. 15 is a sectional view taken along line XV-XV in Fig. 3 .

Fig. 16 is a partially cutaway side view of a rocking unit according to another embodiment.

Fig. 17 is a top view of the rocking unit of Fig. 16 .

Fig. 18 is a side view of the suction chamber.

Figure 19 is a bottom view of the same suction chamber.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 15 .

This embodiment is suitable for a two-wheeled motorcycle 1 equipped with a unit-shaking internal combustion engine. FIG. 1 shows a general side view of the two-wheeled motorcycle 1 .

The front part 2 of the vehicle body and the rear part 3 of the vehicle body are connected by the low pedal part 4, and the vehicle body frame 5 serving as the frame of the vehicle body consists of a front frame 5a, a pair of left and right horizontal frames 5b, 5b, and a pair of left and right rear parts. The girders 5c, 5c constitute. The front frame 5a is formed by descending along the front of the vehicle body, and the horizontal frames 5b, 5b are divided into two at the lower end of the front frame 5a and extend rearward through the bottom of the pedal portion 4 . The aforementioned rear girders 5c, 5c stand up from the respective rear portions of the horizontal girders 5b, 5b and extend obliquely rearward.

The seat 6 is provided above the rear frame 5c of the vehicle body rear part 3, and the storage box 7 is arrange|positioned under the seat 6. As shown in FIG.

On the front part 2 of the car body, a steering head 9 with a handle 8 is arranged on the top, and the front wheel 11 is suspended by the front fork 10 on the lower side, and the direction is manipulated by the handle 8 .

The front end of the swing unit 15 is connected to the bent portion of the rear of the horizontal girder 5 b through the link member 12 .

The rocking unit 15 is connected to the vehicle body frame 5 by the connecting rod 12, and can freely rock up and down. A reaction cylinder 13 is clamped between the rear portion of the rocking unit 15 and the rear frame 5c above it.

The front part of the drive belt control box 20 with a very long front and rear dimension of the swing unit 15 doubles as a crankcase, and the internal combustion engine 6 is integrally provided. The rear portion doubles as a gearbox, and the shaft supports the rear axle 18. The power of the internal combustion engine 16 is transmitted to the rear wheel 18 through the transmission belt control device 17, which is a transmission belt transmission mechanism with an automatic speed change function.

A suspension bracket 20a connected to the link member 12 protrudes from the front end of the transmission belt control box 20, and the opening on the left side is covered with a transmission box cover 28.

The internal combustion engine 16 is a two-cycle internal combustion engine, and the cylinder 16a covered by the shroud 19 is erected slightly backward, and an air intake 21 is formed on the crankcase on the left side of the cylinder 16a. A reed valve is embedded in it.

The suction pipe member 22 is installed on the suction port 21. After the suction pipe 22b of the suction pipe member 22 extends to the left, it bends backward and is connected to the gasifier 23. The gasifier 23 passes through the connecting pipe. 24 is connected to the air cleaner 25 arranged on the upper side of the rear half of the belt control box 20 .

As shown in FIGS. 4 and 5 , the shroud 19 covering the cylinder 16a is roughly composed of a rectangular cylindrical side wall 19a and an upper wall 19b, and an extension 19c extends rearward from the left rear corner of the side wall 19a. .

A circular opening 19d is formed at the axial center position of the cylinder on the upper wall 19b.

Moreover, a substantially rectangular notch 19e is formed at the bottom of the left side wall 19a, and a bulging portion 19f bulging to the left is formed above the notch 19e, and an opening to the rear and left is provided at the top of the bulging portion 19f. The air outlet of the 19g.

When the guard cover 19 covered the cylinder 16a, the suction port 21 above the crankshaft cover and the right half of the suction pipe member 22 installed on the same suction port 21 were located in the guard cover 19, and the suction pipe member 22 protrudes from the notch 19e of the shield 19 .

As shown in Figures 6 to 8, in the suction pipe part 22, the suction pipe 22b extends obliquely upward to the left from the middle part of the substantially rectangular connection base 22a installed on the suction port 22, and the top end The connecting portion 22c is formed by bending backward.

Furthermore, a connection branch pipe 22d for the suction chamber branching upward is integrally formed on a portion extending from the connection base 22a of the suction pipe 22b.

In addition, a connection branch pipe 22e for an automatic valve protrudes from a portion forward of the connection portion 22c of the suction pipe 22b.

The air-fuel mixture outlet connection part 23b of the carburetor 23 is connected to the connection part 22c which is the upstream side of the intake pipe 22b.

The carburetor 23 connected to the intake pipe member 22 is equipped with a motorcycle starter 23a, the mixed gas outlet connection portion 23b facing forward is combined with the connection portion 22c on the upstream side of the intake pipe 22b, and the rearward The air intake connection portion 23c is connected to the air cleaner 25 through the connection pipe 24 .

The air cleaner 25 is composed of an air cleaner cover 26 and a cover 27 plugged into the left opening thereof.

As shown in FIGS. 9 to 11, the air cleaner cover 26 has a concave portion bulging from the left opening peripheral portion 26a to the right side by a rectangular concave portion 26c on the front side and an external air suction concave portion 26d on the rear side. Separated by the vertical partition wall 26b near the rear, the front half of the rectangular concave portion 26c on the front side forms a trapezoidal concave portion 26e concave to the right.

A corner tube portion 26f directed obliquely up and down is formed on the rear outside air suction recess 26d, and the corner tube portion 26f communicates the upper end to the inside and opens the lower end to the outside.

The front half of the rectangular recess 26c has a trapezoidal recess 26e, the right side of its upper wall is recessed to form a step portion 26g, and a part of the horizontal wall of the step portion 26g is recessed into a rectangle to form a recess 26h. On the vertical wall of the recess 26h Screw holes 26I are processed.

A circular hole 26j communicating with the connection pipe 24 is formed on the front wall of the mesa-shaped recess 26e.

Brackets 26k, 26l protrude from the lower walls of the rectangular recessed portion 26c and the mesa-shaped recessed portion 26a, and the brackets 26k, 26l are used for installing the aforementioned transmission belt control box 20.

The cover 27 covers the left side so as to close the opening of the air cleaner cover 26 and extends further forward from the air cleaner cover 26 to cover the left side of the carburetor 23 . (Refer to Figure 3)

The intake chamber 30 is attached to the step portion 26g of the aforementioned air cleaner cover 26 .

As shown in FIGS. 12 to 14 , the suction chamber 30 is formed in a long cylindrical shape, and a connecting pipe 30 a protrudes forward from the bottom of the front wall.

The protruding piece 30b protrudes downward from the bottom wall of the suction chamber 30, and a mounting hole 30c is provided in the center of the protruding piece 30b.

When the suction chamber 30 is fitted to the stepped portion 26g of the aforementioned air cleaner cover 26 according to a predetermined positional relationship, referring to FIG. Screws 32 pass through the mounting holes 30c of the mounting holes 30c and are screwed into the screw holes 26I for fastening, so that the suction chamber 30 can be fixed on the air filter cover 26.

As shown in Figure 15, the suction chamber 30 installed on the air cleaner cover 26, its highest part is on approximately the same height as the highest part of the air cleaner cover 26, therefore, the suction chamber 30 is hidden in the air. Inside the filter 25, it cannot be seen from the outside. Seek improvements in appearance.

In this way, the suction chamber 30 installed on the air cleaner cover 26 is located behind the connecting branch pipe 22d branched upward from the suction pipe 22b of the suction pipe member 22 as shown in FIG. The connection pipe 30a of the chamber 30 protrudes toward the connection branch pipe 22d, and the suction hose 31 as a mixed gas inlet and outlet pipe connects the connection branch pipe 22g and the connection pipe 30a at positions close to each other.

When the shroud 19 covers the cylinder 16a of the internal combustion engine 16, the bulging portion 19f bulged to the left of the shroud 19 covers the connecting branch pipe 22d branched upward from the intake pipe 22b, and the exhaust port on the upper part of the bulging portion 19f. 19g opens to the rear and left and faces the carburetor 23 and the suction chamber 30 .

Therefore, the warm air coming out from the air outlet 19g is blown onto the vaporizer 23, which can heat the vaporizer 23 and prevent freezing.

Especially as shown in FIG. 3, since the right side of the gasifier 23 is walled with the extended portion 19e of the shield 19, and the left side is covered with the extended portion of the cover 27, the exhaust air effectively acts on the gasifier. , the effect of preventing freezing is great.

And the suction hose 31 that connects the rear end to the connecting pipe 30a of the suction chamber 30 extends forward, and enters the inside of the shield 19 from the exhaust port 19g that opens rearward of the shield 19, and passes through its front end. The suction pipe 22b communicates with the suction chamber 30 in conjunction with the connecting branch pipe 22d branching upward from the suction pipe 22b.

Because the exhaust port 19g of the shield 19 is used to communicate with the suction hose 31, it is not necessary to specially provide an opening for the suction hose 31 on the shield 19.

As mentioned above, since the suction hose 31 is connected to the connecting branch pipe 22d branching upward from the suction pipe 22b on the downstream side of the throttle valve in the carburetor 23 and to the air filter installed on the upstream side of the throttle valve, The connection pipe 30a protruding in front of the suction chamber 30 on the step portion 26g of the cleaning cover 26, the connection branch pipe 22d at a position close to each other on the right side of the vaporizer 23, and the connection pipe 30a are connected, so the suction is soft. The length of the pipe 31 is short, and there is no disadvantage in the charging performance, that is, since the suction hose 31 is short, the charging of the mixture gas from the suction chamber to the internal combustion engine through the suction pipe 22b can be performed quickly so that there is no time lag , and there is no bad situation in the layout.

The air cleaner cover 26 on which the air intake chamber 30 is installed is located at a position away from the link member 12 as the swing center of the swing unit 15, has a surplus space between the vehicle body above and is installed on the The air intake chamber 30 on the step portion 26g of the air cleaner cover 26 does not protrude upward from the air cleaner 25, and even if it is integrally shaken with the swing unit 15, the air intake chamber 30 does not interfere with the vehicle body.

The suction chamber 30 installed in this way communicates via a suction hose 31 to a branch of the suction pipe 22b, which branch is located between the upstream throttle valve and the downstream reed valve.

Therefore, when the reed valve is closed, the mixed gas in the flow is introduced into the suction chamber 30, and when the reed valve is opened, the mixed gas is combined with the mixed gas flowing in the suction pipe 22b and inhaled, which can improve the efficiency of suction. Filling efficiency.

The suction chamber 30 is not limited to being installed on the step portion 26g and can also be installed on other places of the air cleaner cover 26, and the suction hose 31 can also be not so long, so the degree of freedom of installation is very large.

Another embodiment shown below is an example in which the suction chamber 50 is mounted on the air cleaner cover 61 as shown in FIGS. 16 and 17 .

As shown in Figures 18 and 19, the suction chamber 50 is shorter than the front and rear length of the aforementioned suction chamber 30, the connecting pipe 50a protrudes forward from the bottom of the front wall, and the mounting piece 50b protrudes from the bottom wall.

The mounting piece 50b is long in the front-rear direction, and the mounting hole 50c is pierced in the rear part, and the front end of the 50b protrudes from the position-limiting pawl 50d.

On the one hand, the air cleaner cover 61 is provided with a screw hole protrusion 61a on the front left side, and a limiting recess 61b is formed in front of it.

In the air suction chamber 50, insert the stop pawl 50d into the stop recess 61b at the specified position on the air filter cover 61 and make a stop, and make the installation piece 50b contact the screw hole protrusion 61a from the right side, and the screw 62 passes through the installation The holes are screwed into and fastened to the screw hole bosses 61 a, so that the suction chamber 50 is fixed to the air cleaner cover 61 .

In this way, one end of the suction hose 51 is connected to the connecting pipe 50a protruding forward of the suction chamber 50 installed on the upper surface of the air cleaner cover 61, and the suction hose 51 extends forward from the connecting pipe 50a. It is bent from the left side of the gasifier 63 to the front side, and the other end is connected to a connecting branch pipe 64a branched at the suction pipe 64 on the downstream side of the gasifier 63 and protrudingly provided. The suction hose 51 is not so long. .

In the present embodiment, although the air suction chamber 50 is installed on the upper part of the air cleaner 60, it is in a position away from the center of shaking of the shaking unit, and there is ample space between the upper vehicle body, so the suction The air chamber 50 does not interfere with the vehicle body.

Since the suction chamber 50 is exposed outside, maintenance and replacement of the suction chamber 50 are easy.

In the above embodiments, the suction chamber and the air filter are separated and installed together by screws, and it is also possible to form the air filter and the suction chamber into a whole in advance.

This reduces the number of parts and facilitates assembly work.

Claims (6)

1. An air intake device for an internal combustion engine for a two-wheeled motor vehicle. In the air intake device of the internal combustion engine, a mixed gas inlet and outlet branch pipe is branched on the air intake passage downstream of the throttle valve, and the air suction chamber is connected to the branch pipe. , characterized in that the suction chamber is provided on an air cleaner cover connected to the upstream side of the throttle valve provided in the carburetor. 2. The air intake device for an internal combustion engine for a motorcycle according to claim 1, wherein said air intake chamber is provided so as to overlap said air cleaner cover in a side view. 3. The air intake device of an internal combustion engine for a motorcycle according to claim 1, wherein the air intake chamber is provided at an upper portion of the air cleaner cover. 4. The intake device for an internal combustion engine for a motorcycle according to any one of claims 1 to 3, wherein the intake chamber is formed independently of the air cleaner cover. 5. The air intake device for an internal combustion engine for a motorcycle according to any one of claims 1 to 3, wherein the air intake chamber is integrally formed with the air cleaner cover. 6. As claimed in any one of claim 1 to claim 3, the air intake device for the internal combustion engine of the two-wheeled motor vehicle is characterized in that: the internal combustion engine is integrally provided with a power transmission device at its rear portion, free to swing The unit rocking type internal combustion engine supported on the vehicle body, and the air cleaner is arranged on the upper part of the rocking unit.

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