KR100342972B1 - Bicycle Mounted with an Internal Combustion Engine - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a bicycle having an internal combustion engine capable of reducing air intake resistance by arranging the air cleaner so as not to protrude toward the vehicle body by using a dead space behind the seat post and installing the intake passage in a straight line. do.

With a substantially V-shaped car body frame 2 formed by installing a seat post 5 extending upwardly in the rear portion of the main frame 4 extending downward from the head pipe 3 downwardly, In the bicycle provided with the internal combustion engine 20 in the lower part of the body frame 2, it is related with the bicycle with the internal combustion engine provided with the air cleaner 30 between the seat post 5 and the rear wheel 9. .

Description

Bicycle with Internal Combustion Engine {Bicycle Mounted with an Internal Combustion Engine}

The present invention relates to a bicycle with an internal combustion engine, and more particularly to an air cleaner device.

As for the bicycle with the internal combustion engine which arrange | positioned the internal combustion engine in the lower part of a vehicle body frame, as shown in the example of Unexamined-Japanese-Patent No. 8-108875 shown in FIG. 7, the vehicle body frame is removed from the head pipe 01. It is formed in the V shape in the extended main frame 02 and the seat post 03, and the internal combustion engine 04 is provided in the lower part of the vehicle body frame.

The internal combustion tank 05 is mounted on the V-shaped bent portion of the main frame 02 and the seat post 03, and a carrier basket 07 having a long vertical length between the rear wheels 06 behind the seat post 03 is provided. It is installed.

In another embodiment, an internal combustion tank is provided behind the seat post 03.

Although the vaporizer | carburetor 08 is arrange | positioned at the upper part of the crankcase 04a of the internal combustion engine 04, the air cleaner connected to the vaporizer | carburetor 08 is unclear.

Perhaps it is thought that the air cleaner is disposed behind the main frame 02 at the rear or the right side of the carburetor 08, but basically it is shaped like a bicycle and protrudes to the right side of the car body having a narrow left and right width.

Therefore, the intake passage connected from the air cleaner to the vaporizer 08 is not straight and is refracted, so the intake resistance is large.

Since the present invention has been made in view of the above, an object of the present invention is to provide an internal combustion engine which can reduce the intake resistance by arranging the air cleaner so that it does not protrude toward the vehicle body by using the dead space behind the seat post. It is to provide an attached bicycle.

In order to achieve the above object, the present invention is provided with a substantially V-shaped vehicle body frame formed by installing a seat post extending substantially upwards to the rear of the main frame extending downwardly inclined from the head pipe. In the bicycle provided with the internal combustion engine in the lower part of the vehicle body frame, it was set as the bicycle with the internal combustion engine provided with the air cleaner between the said seat post and the rear wheel.

Since the air cleaner was installed using the dead space between the seat post and the rear wheel, the air cleaner can be disposed in the center of the vehicle body width direction so as not to protrude toward the vehicle body side.

The intake resistance can be reduced by arranging a carburetor in a substantially center of the vehicle body having a narrow left and right widths, and providing an intake passage connecting the air cleaner disposed in the center of the vehicle body width direction in a straight line.

The invention according to claim 2 is characterized in that, in the bicycle with the internal combustion engine according to claim 1, the air cleaner is divided into the left and right sides of the connecting port and the inlet of the connecting tube connected to the vaporizer.

The suction duct extending from the suction port and the connecting tube extending from the connection port can be compactly installed in a narrow left and right width without interfering with the seat post.

According to a third aspect of the present invention, in a bicycle with an internal combustion engine according to claim 1 or 2, a battery is disposed below the air cleaner.

The dead space under the air cleaner can be used effectively.

1 is an overall side view of a bicycle with an internal combustion engine according to a first embodiment of the present invention;

2 is a side view of the air cleaner and its vicinity;

3 is a cross-sectional view taken along the line III-III of FIG.

4 is a cross-sectional view taken along the line IV-IV in FIG. 2;

5 is a top view of a part of the exhaust pipe and the muffler in cross section;

6 is a cross-sectional view taken along the line VI-VI in FIG. 5,

7 is a side view of a bicycle to which a conventional internal combustion engine is attached.

<Description of the symbols for the main parts of the drawings>

1: Bicycle with internal combustion engine 25: Chain

2: body frame 26: pedal arm

3: head pipe 27: pedal

4: main pipe 30: air cleaner

5: seatpost 31: battery

6, 7: backstay 32: storage case

8: rear wheel bearing 33: lid member

9: rear wheel 34: screw

10: rear fender 35, 36: bolt, nut

11: all fork 37: suction duct

12: front wheel 38: connecting tube

13: Fender all 40: carburetor

14: handle 45: exhaust pipe

15: internal combustion tank 50: muffler

16: sheet 51: upper case

17, 18: bracket 52: lower case

19: stand 53: separator

20: internal combustion engine 54: communication tube

21: shifting gear case 55: tail pipe

22: pedal crankshaft 56: mounting piece

23: drive sprocket 57: bolt, nut

24: driven sprocket 58: support stay

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment which concerns on this invention is described and shown in FIG.

The whole side view of the bicycle 1 with an internal combustion engine of this embodiment is shown in FIG.

The body frame 2 extends from the head pipe 3 to the rear side of the main pipe 4 with a slight downward inclination, and at the rear side, a seat post 5 is installed to incline upward and extend upward. In the view, it is generally V-shaped.

The seat post 5 extends a little lower than the engaging portion of the main pipe 4, and from the lower end, a pair of left and right backstays 6 extend downwardly at the rear and bend horizontally on the way to the rear. And a pair of left and right backstays 7 extending horizontally from the top of the seat post 5 to the rear inclined downwards, so that the rear ends of both backstays 6 and 7 are rear wheel bearing portions 8. ) Are combined.

The rear wheel 9 is axially supported by the rear wheel bearing part 8, and the rear fender 10 covers the upper side of the rear wheel 9.

The stand 19 is freely mounted to the rear wheel bearing 8.

On the other hand, the front wheel 12 is axially supported by the lower end of all the forks 11 pivotally supported by the head pipe 3, and the handle 14 is attached to the upper end.

The fender 13 covers the upper side of the front wheel 12 altogether.

The internal combustion tank 15 extends from the engagement portion with the head pipe 3 of the main pipe 4 to the center portion, and the seat 16 is mounted on the upper end of the seat post 5.

The small internal combustion engine 20 of a 4-cycle 1 cylinder hangs below the V-shaped body frame 2.

It is fixed to the joint part of the main pipe 4 and the seat post 5, and the bracket 17 is installed in a row below, and the lower side mounting bracket of the upper part of the crankcase 20a of the internal combustion engine 20 is supported by the lower end of the bracket. The rear mount bracket of the internal combustion engine 20 is supported through the support shaft 18a to the bracket 18 which is supported through 17a and protrudes to the whole of the backstay 6.

As for the internal combustion engine 20, the cylinder 20b is erected in the inclined front side from the crankcase 20a, and the transmission gear case 21 is integrally provided in the back of the crankcase 20a.

A pedal clutch shaft 22 and a drive sprocket 23 are provided on the output shaft 21a protruding left and right from the shift gear case 21 via a one-way clutch, and a drive sprocket 24 provided in the rear wheel bearing part 8. The chain 25 spans between and.

Pedal arms 26 are fitted to the pedal crankshaft 22 at left and right ends, respectively, and the pedals 27 are rotatably supported on the front end of the pedal crank shaft 22.

Therefore, by driving the internal combustion engine 20, the drive sprocket 23 can be rotated through the transmission gear, and the rear wheel 9 can be rotated and driven through the chain 25, and the pedal 27 is pressed by manpower. It is also possible to travel by rotating the rear wheel 9 through the chain 25.

And the air cleaner 30 and the battery 31 are accommodated in the common case 32 in the space between the rear wheels 9 in the back of the seat post 5, and are installed.

The case 32 is divided into upper and lower sides, and the upper flat box forms the air cleaner case 32a, the lower flat box forms the battery storage case 32b, and has a common rectangular opening on the right side. The lid member 33 blocks the opening, and the lid member 33 is attached to the case 32 by screwing two screws 34 and 34.

Referring to FIG. 2, the case 32 is formed in a substantially rectangular shape when viewed from the side, and is inserted into the rectangular space surrounded by the seat posts 5 and the rear wheel 9 and the top and bottom by the backstays 6 and 7. .

Mounting pieces 32c and 32d are projected on the front and lower surfaces of the case 32, and the bolt and nut 35 are attached to the bracket 5a on which the front mounting piece 32c is projected to the seat post 5, respectively. 3 is screwed together (see Fig. 3), and the lower mounting piece 32d is screwed by a bolt nut 36 to the bracket 6a protruding from the lower back stay 6 (Fig. 3). 4), the case 32 is mounted to the vehicle body frame 2.

As shown in FIG. 3, FIG. 4, the air cleaner 30 is comprised by inserting the air cleaner element 30a between the air cleaner case 32a and the lid member 33, and internally, it is an air cleaner element 30a. ) Is divided into the dirty side 30b on the right side and the clean side 30c on the left side.

The seat post 5 extends the center of the front surface of the air cleaner 30 in the vertical direction, and the suction duct 37 on the right side and the connecting tube 38 on the left side extend from the front surface of the air cleaner 30 on the seat post 5. It extends forward with).

The suction duct 37 on the right side of the seat post 5 penetrates through the lid member 33 and is inserted into the contamination side 30b. The connecting tube 38 on the left side of the seat post 5 is air cleaner case 32a. ) Is inserted into the clean side 30c.

The connecting tube 38 extending forward from the front left side of the air cleaner case 32a is bent downward along the left side of the seat post 5 and then bent forward again to the left side of the bracket 17. It extends along and the junction part 38a of the front end is joined to the vaporizer | carburetor 40 arrange | positioned above the crankcase 20a.

And the connecting tube 38 is on the right rather than the left pedal arm 26 and is between the bracket 17.

And the intake pipe 39 extending upward from the cylinder 20b tilted forward obliquely is connected to the vaporizer 40 located upwardly inclined than the cylinder 20b.

The carburetor 40 is disposed slightly to the left than the center of the vehicle body, and since the connecting tube 38 connecting the air cleaner 30 is along the left side of the seat post 5, the connecting tube 38 is moved forward and backward. It extends straight in the direction and reduces intake resistance.

The muffler 50 is installed in a space where the end is wide open downward between the curved rear side of the transmission gear case 21 and the rear wheel 9.

The mounting piece 56 which stands up on the upper case 51 of the muffler 50 to the bracket 21b protruding from the curved rear face of the transmission gear case 21 is screwed by the bolt nut 57, The muffler 50 is suspended.

The exhaust pipe 45 extending from the front exhaust port of the cylinder 20b extends downwardly inclined downward along the lower surface of the cylinder 20b slanted forward and is approximately horizontal from the bottom of the crankcase 20a. It is bent and extended to the rear, and is connected to the muffler 50 in the form of an S-shaped back and forth between the muffler 50.

As shown in Fig. 5, the exhaust pipe 45 shifts to the left side at the rear inclined downwardly inclined portion 45a extending from the exhaust port slightly to the right of the body center line L-L ', and approximately The curved portion 45b horizontally curved is parallel to the body center line L-L 'and extends backward to form the first straight portion 45c, and the curved portion curved in a U shape on the right side near the muffler 50. Extends forward through 45d to form a second straight portion 45e, and extends backward through the curved portion 45f curved in a U-shape on the right side at the same forward position as the bent portion 45b; The three straight portions 45g are formed, and the third straight portion 45g extends backward and is inserted into the muffler 50 as it is.

The first, second and third straight portions 45c, 45e, 45g of the exhaust pipe 45 are on the same horizontal plane along the lower surface of all the crankcase 20a and the transmission gear case 21, and the curved portions 45d, 45f) is narrowed in the left-right width of the muffler 50, and is accommodated between the left-right pedal arms 26 and 26.

5 and 6, the muffler 50 has a rectangular shape when viewed from the top, and the upper case 51 and the lower case 52 are welded and coalesced at the same time with the separator 53 interposed therebetween. The upper space divided by the separator 53 is the first expansion chamber 51a, and the lower space is the second expansion chamber 52a.

The upper case 51 has a shape along the rear of the rear wheel 9 along the curved rear surface of the transmission gear case 21, and is accommodated therebetween.

The exhaust pipe 45 is inserted into the second expansion chamber 52a in the lower case 52 of the muffler 50, and the extension pipe portion 45h is curved in a U-shape by extending the inside to the rear to support the support 58. After extending to the front side a little, it bends upwards and penetrates through the separator 53, and the upper end is opened into the upper 1st expansion chamber 51a from the separator 53.

A communication pipe 54 is separately installed in the separator 53 to connect the first expansion chamber 51a and the second expansion chamber 52a to communicate with each other, and the tail pipe is installed through the rear wall of the lower case 52. 55 connects the 2nd expansion chamber 52a and the exterior, and is made to communicate.

Therefore, the exhaust gas of the internal combustion engine 20 enters the first expansion chamber 51a first through the exhaust pipe 45 having the required S shape in front and rear, and then communicates with the communication pipe 54 from the first expansion chamber 51a. Entering into the second expansion chamber (52a) through, and is discharged to the outside from the tail pipe (55).

Since the exhaust case 45 and the tail pipe 55 are provided in the lower case 52 without installing anything in the upper case 51 of the muffler 50, the assembly is simple and the number of jigs is very small and very adhesive. This is good.

In addition, since the upper case 51 and the lower case 52 are welded at the same time with the separator 53 interposed therebetween, the airtight holding is surely performed.

Since the bicycle 1 with the internal combustion engine is basically in the shape of a bicycle, and the vehicle body width is narrow, it is required to store each device in a narrow body width to maintain the light appearance of the bicycle.

Thus, the muffler 50 is not disposed on the side of the rear wheel 9 and is disposed at the left and right center positions by using the space between the front transmission gear case 21 and the rear wheel 9, and thus the cylinder 20b. The distance between the exhaust port and the muffler 50 and the exhaust pipe is shortened and the exhaust pipe is shortened at the bottom of the crankcase 20a and the transmission gear case 21 in an S-shape to secure the required length.

And the air cleaner 30 and the battery 31 are also installed in the center position of the left-right width direction using the dead space between the seat post 5 and the rear wheel 9,

Since the duct 37 and the connecting tube 38 extend out from the right and left with the seat post 5 of the air cleaner 30 provided in the back of the seat post 5 interposed, the suction duct 37 The connecting tube 38 can be accommodated within the required left and right widths without interfering with the seat post 5.

And since the air cleaner 30 and the battery 31 are installed in the common case 32, and the lid member 33 blocks the common opening on the right side, the number of parts is small and the assembly efficiency is good, and the said lid By opening the member 33, maintenance such as replacement of the air cleaner element 30a and operations such as replacement of the battery 31 can be easily performed.

The battery 31 is inserted into the battery storage case 32b from the right side of the vehicle body and is covered with the lid member 33 so that it is not visible from the outside.

Since the heavy battery 31 is provided below the air cleaner 30, the center can be made low.

Claims (3)

Bicycles having an internal combustion engine installed in the lower part of the body frame, having a substantially V-shaped body frame formed by installing a seat post extending upwardly in the rear portion of the main frame extending downward from the head pipe. To A bicycle with an internal combustion engine, characterized in that an air cleaner is installed between the seat post and the rear wheel. The bicycle with an internal combustion engine according to claim 1, wherein the air cleaner divides the inlet and the inlet of the connecting tube connected to the carburetor from side to side with the seat post therebetween. The bicycle with an internal combustion engine according to claim 1 or 2, wherein a battery is disposed below the air cleaner.