WO2003035461A1

WO2003035461A1 - Arrangement of secondary air control valve for exhaust in motorcycle

Info

Publication number: WO2003035461A1
Application number: PCT/JP2001/009214
Authority: WO
Inventors: Yasuhiro Takada; Dai Hiwatashi; Shoichiro Sato
Original assignee: Honda Giken Kogyo Kabushiki Kaisha
Priority date: 2001-10-19
Filing date: 2001-10-19
Publication date: 2003-05-01
Also published as: JP3975198B2; AR033184A1; JPWO2003035461A1; CN1558851A; CN1275825C; KR100618728B1; BR0117156A; KR20040052227A; TW558595B; BR0117156B1

Abstract

In a motorcycle where an engine being disposed below a main frame is suspended while inclining the cylinder axis forward from a body frame provided with the main frame extending downward in backward direction and an intake system comprising an air cleaner and a carburetor is disposed above the engine, a secondary air control valve (48) for controlling supply of secondary air for exhaust to the exhaust port of the engine (E) is interposed between a starter motor (50) fixed to an upper part of the engine (E) and the carburetor (38) and between the engine (E) and the main frame (13). Since the secondary air control valve is disposed by utilizing the space between the main frame and the engine effectively, the secondary air supply line can be shortened,

Description

Field of the Invention Structure of arrangement of secondary air control valve for exhaust in motorcycle

According to the present invention, an intake device including an air cleaner and a carburetor, wherein an engine disposed below the main frame with a cylinder axis inclined forward is suspended on a body frame including a main frame extending rearward and downward from a head pipe. The present invention relates to motorcycles placed above the engine, and in particular, to improvements in the arrangement of secondary air control valves for exhaust.

Background art

Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-320326, below the riding seat supported by a seat rail extending rearward from the main frame, below the main frame. There is known a structure in which a secondary air control valve for controlling the supply of secondary air for exhaust to an engine to be arranged is arranged.

However, in the above-described conventional vehicle, the secondary air control valve is disposed behind the engine even though the cylinder axis of the engine is inclined forward, despite the presence of an empty space between the main frame and the engine. As a result, the length of the secondary air supply line connecting the secondary air control valve and the engine becomes longer.

The present invention has been made in view of such circumstances, and a secondary air control valve has been arranged by effectively utilizing a space between a main frame and an engine to shorten a secondary air supply line. An object of the present invention is to provide an arrangement structure of a secondary air control valve for exhaust in a motorcycle.

Disclosure of the invention

In order to achieve the above object, the present invention provides a vehicle body frame including a main frame extending rearward and downward from a head pipe, wherein an engine disposed below the main frame with a cylinder axis inclined forward is suspended, and an air cleaner and In a motorcycle in which an intake device including a carburetor is disposed above the engine, a secondary air control valve for controlling supply of secondary air for exhaust to an exhaust port of the engine is provided above the engine. Between the attached starter and the vaporizer and The first feature is that it is arranged between the gin and the main frame.

According to the configuration of the first aspect, the carburetor of the intake device disposed between the engine and the main frame, which tilts the cylinder axis forward, and the cell motor mounted on the upper portion of the engine, are disposed above the engine. The secondary air control valve can be effectively placed in the space created between Moreover, since the secondary air control valve is arranged near the engine, the secondary air supply 1-pipe connecting the secondary air control valve and the engine can be shortened.

Further, in the present invention, in addition to the configuration of the first aspect, a secondary air cleaner connected to the secondary air control valve on an upstream side thereof interposes a center line passing through a center in a width direction of the main frame. According to this configuration, the carburetor and the secondary air cleaner are arranged at positions shifted in the width direction of the vehicle body frame, so that the engine and the The carburetor and secondary air cleaner can be effectively placed in the narrow space between the main frames.

According to the present invention, in addition to the configuration of the first aspect, most of a secondary air supply pipe connecting the secondary air control valve and an exhaust port of the engine is located at a center in a width direction of the main frame. The third feature is that the carburetor and the secondary air supply line are arranged on the opposite side of the vaporizer with the passing center line therebetween. can do.

BRIEF DESCRIPTION OF THE FIGURES

1 to 6 show one embodiment of the present invention. FIG. 1 is a side view of a motorcycle, FIG. 2 is a left side view of the motorcycle near an engine, and FIG. 3 is a view of the motorcycle near an engine. Right side view, Fig. 4 is a view taken in the direction of arrow 4 in Fig. 2 without the main frame, Fig. 5 is an enlarged sectional view taken along line 5-5 in Fig. 3, and Fig. 6 is an enlarged sectional view taken along line 6-6 in Fig. 2. It is.

BEST MODE FOR CARRYING OUT THE INVENTION First, referring to FIG. 1, the motorcycle body frame F of the motorcycle includes a head pipe 12 for supporting the front fork 11 so as to be steerable, a main frame 13 extending rearward and downward from the head pipe 12, and the main frame. 13 and a pair of left and right lyaframes 14 connected to the rear of the front fork 11 and extending upward. The front wheel WF is rotatably supported at the lower end of the front fork 11. A steering handle 15 is connected to the upper end.

Referring to FIGS. 2 and 3 together, hanger plates 16 are fixed to both sides of the intermediate portion of main frame 13, respectively, and pivot plates 17 are provided to both sides of the rear portion of main frame 13. It is fixed.

An engine E having a cylinder axis C 1 inclined forward is disposed below the main frame 13. The engine E is supported by the hanger plates 16 and the pivot plates 17 so that Suspended on frame F. On both sides of the engine E, footsteps 18 for occupants to put their feet on are provided.

The pivot plate 17 is provided with a cylindrical support shaft 20, and front ends of a pair of left and right lyaforks 21... Are supported on both ends of the support shaft 20 so as to be able to swing up and down. Rear fork 2 1 ... The rear wheel WR is supported between the rear ends.

The upper part of the rear wheel WR is covered by a lender fender 24 attached to the lya frame 14. A fuel tank 25 supported by the lya frame 14 is arranged above the lender fender 24. Is done. A tandem seat 26, which is a seat for riding, is disposed so as to cover the fuel tank 25, and a rear cushion unit 27 is provided between the rear frame 14 and both rear forks 21. Are provided.

The vehicle body frame F is covered with a vehicle body cover 30 made of synthetic resin. The vehicle body cover 30 includes a pair of left and right main frame side power members 31 that cover both sides of the main frame 13, A pair of left and right redder shields 3 2… fastened to the front of both main frame side covers 3 1… so that the legs are covered from the front, and both sides by covering the head pipe 12 from the front. The front cover part 3 3 connected to the redder shield 3 2… and the upper cover connected to the front top cover 3 3 covering the head pipe 12 from the rear side and covering the main frame 13 from above. 3 4, an under-force bar 3 5 connected to the lower part of both main frame side covers 3 1 ..., and a pair of right and left lya side covers that cover the rear of the body frame F from both sides together with most of the fuel tank 25. 3 6 ...

Referring also to FIG. 4, an intake device 40 including an air cleaner 37, a carburetor 38 and an intake pipe 39 is arranged above the engine E. At the top of the air cleaner 37, a pair of mounting plate portions 37a, 37a sandwiching the main frame 13 from both sides are provided on the body, and both mounting plate portions 37a, 37a are provided. Fastened to both sides of the main frame 13 by the ports 41,41. That is, the vacuum cleaner 37 is fixed to the main frame 13.

The upstream end of the carburetor 38 located above the cylinder head 42 in the engine E is directly connected to the air cleaner 37, and the intake pipe is connected to the downstream end of the carburetor 38 at the upstream end. The downstream end of the intake pipe 39 is formed so as to be continuous with the intake port 43 arranged at the upper part of the cylinder head 42. 2 is connected to the upper side wall.

An upstream end of an exhaust pipe 45 is connected to a lower side wall of the cylinder head 42 so as to be continuous with an exhaust port 44 arranged below the cylinder head 42. The exhaust pipe 45 extends rearward from the cylinder head 42 and is connected to an exhaust muffler 46 (see FIG. 1) disposed on the right side of the rear wheel WR.

The exhaust port 44 of the cylinder head 42 of the engine E is supplied with secondary air for exhaust, and the secondary air for controlling the supply of the secondary air to the exhaust port 44 is controlled. An air control valve 48 is arranged between the starter 50 attached to the upper part of the crankcase 49 of the engine E and the carburetor 38 and between the engine E and the main frame 13.

In FIG. 5, the secondary air control valve 48 includes a diaphragm actuator 52, an on-off valve 53 that is driven to close by the diaphragm actuator 52, and an exhaust port of the engine E. The diaphragm valve 52, which is composed of a lead valve 54 that only allows air to flow to the side 44, holds the peripheral edge with the casing 55 and the casing 55. And a metal rod 57 having one end connected to the center of the diaphragm 56.

The casing 55 includes a body 58 and a cover 59 which is fastened to the body 58 by hermetically sandwiching a peripheral portion of the diaphragm 56 therebetween, and includes a force par 59 and a diaphragm. A negative pressure chamber 60 facing one surface of the diaphragm 56 is formed between 56 and the atmospheric pressure chamber 61 between the body 58 and the diaphragm 56. It is formed. At the center of the force par 59, a connecting pipe portion 63 having a distal end fc restricting hole 62 is continuously provided, and a negative pressure extracting pipe communicating with the negative pressure chamber 60 through the restricting hole 62 is provided. The line 64 is connected to the connection pipe 63, and the negative pressure extraction pipe 64 is connected to the intake pipe 39 of the suction device 40 as shown in FIG. As a result, the negative pressure in the intake pipe 39 acts on the negative pressure chamber 60.

The rod 57 is supported by the body 58 so as to be movable in the axial direction, and one end of the rod 57 is directly connected to the center of the diaphragm 56 on the atmospheric pressure chamber 61 side. In Kuchiyue 52, when the negative pressure in the intake pipe 39 increases, the diaphragm 56 flexes in the direction of decreasing the volume of the negative pressure chamber 60, and the rod 57 moves upward in FIG. Will work.

The on-off valve 53 includes a valve housing 67, a valve element 68 fixed to the other end of the rod 57, and a return spring 69 provided between the valve housing 67 and the valve element 68. .

The valve housing 67 includes the body 58 and a suction cover 70 that is hermetically fastened to the body 58. The body 58 includes an air flow passage 71 and air. A communication hole 72 that allows the flow passage 71 to communicate with the atmospheric pressure chamber 61; a valve hole 73 that communicates with the rod 57 through the upstream end of the air flow passage 71; and the air flow passage A valve seat 74 having the valve hole 73 opened at the center on the side opposite to 71, and a support cylinder 75 partially inserted coaxially into the valve hole 73 are provided. A rod 57 coaxially penetrating through the hole 73 is fitted into the support cylinder 75 so as to be movable in the axial direction ^three times. A valve chamber 76 is formed between the body 58 and the suction cover 70. Further, a connection pipe portion 77 communicating with the valve chamber 76 is formed in the suction cover 70 so that the downstream end of the pipe 78 is connected to the connection pipe 77. The upstream end of the conduit 78 is connected to a secondary air cleaner 79, and an air introduction conduit 80 connected to the upstream end of the secondary air cleaner 79 is connected to the main frame 13 near the head pipe 12. It is extended forward along. Moreover, the secondary air cleaner 79 is disposed on the opposite side of the carburetor 38 with respect to the center line C2 passing through the center of the main frame 13 in the width direction.

The valve seat 74 is formed in the body 58 so as to face the valve chamber 76, and the valve seat 74 A valve body 68 accommodated in the valve chamber 76 is provided at the other end of the rod 57 so as to be able to be seated on the other end.

The return spring 69 has a coil shape surrounding the support cylindrical portion 75, and the direction in which the valve element 68 is separated from the valve seat 74, that is, the diaphragm 5 of the diaphragm actuator 52. The spring 6 is provided between the body 58 and the valve element 68 by exerting a spring force in a direction of bending the element 6 toward the atmospheric pressure chamber 61.

The reed valve 54 is supported by a disc-shaped valve support plate 82 having a valve hole 81 at the center so as to be able to open and close the valve hole 81. The plate 82 is hermetically sandwiched between the body 58 and the third cover 83 fastened to the pod 58 so that the valve hole 81 communicates with the downstream end of the air flow passage 71. You. A valve chamber 84 for accommodating the reed valve 54 is formed between the third cover 83 and the valve support plate 82.The valve chamber 84 is formed integrally with the third force par 83 so as to communicate with the valve chamber 84. The upstream end of the secondary air supply line 86 is connected to the connection tube 85 provided. The downstream end of the secondary air supply pipe 86 is connected to a lower portion of the cylinder head 42 so as to communicate with the exhaust port 44 of the cylinder head 42 of the engine E.

In addition, most of the secondary air supply line 86 is arranged on the opposite side of the carburetor 38 with respect to the center line C2 passing through the center of the main frame 13 in the width direction.

Such a secondary air control valve 48 is fixed to the main frame 13 of the body frame F. That is, a stay 87 is fastened to the side surface of the main frame 13, and a support flange 58 a provided integrally with the body 58 so as to contact the stay 87 from below is provided with the stay 87. It is concluded to 7.

A fuel tank 25 arranged below the tandem seat 26 and a carburetor 38 arranged below the front of the fuel tank 25 form a fuel supply pipe extending downward from the fuel tank 25. In the middle of the fuel supply line 88, a negative pressure operated fuel cock 90 that operates by the negative intake air pressure of the engine E is interposed.

In FIG. 6, a fuel cock 90 includes a casing 91, a diaphragm 92 whose peripheral portion is sandwiched by the casing 91, a valve body 93 fixed to a central portion of the diaphragm 92, And a return spring 94 provided between the single thing 91 and the diaphragm 92. The casing 91 includes a body 95 and a cover 96 which is airtightly sandwiched between the peripheral edges of the diaphragm 92 and is caulked to the body 95. A negative pressure chamber 97 facing one surface of the diaphragm 92 is formed between the first and second diaphragms 92. In addition, a spring receiving plate 98 is in contact with the inner surface of the cover 95 within the negative pressure chamber 97, and the return spring 94 flexes the diaphragm 92 toward the side that increases the volume of the negative pressure chamber 97. The spring is contracted between the diaphragm 92 and the spring receiving plate 98 so as to exert the spring force in the turning direction.

The cover 96 is provided with a connecting pipe portion 99 communicating with the negative pressure chamber 97 on the body, and a negative connection is provided between the connecting pipe portion 99 and the intake pipe 39 of the intake device 40. Connected by pressure extraction line 100. That is, the negative pressure in the intake pipe 39 is introduced into the negative pressure chamber 97.

A valve chamber 101 is formed between the diaphragm 92 and the body 95, and a valve seat in which the valve body 93 fixed to the center of the diaphragm 92 is seated in the body 95. 102 and a valve hole 103 having a downstream end opened at the center of the valve seat 102. Moreover, of the fuel supply line § 8, a line portion 8 8a connecting the fuel tank 25 and the fuel cock 90 is connected to the body 95 so as to communicate with the valve hole 103, and the fuel line 8, a pipe portion 8 b connecting between the carburetor 38 and the fuel cock 90 is connected to the body 95 so as to communicate with the valve chamber 101.

The intake pipe 39 is provided with a mounting stay 39a that protrudes toward the fuel cock 90 side, and a support plate 104 fastened to the mounting stay 39a includes the fuel The flange 95 a provided integrally with the body 95 of the cock 90 is fastened. That is, the fuel cock 90 is attached to the intake pipe 39. With the fuel cock 90 attached to the intake pipe 39 in this manner, the fuel cock 90 is disposed below the main frame 13 and beside the secondary air control valve 48, and the carburetor 3 It is located on the opposite side of 8.

A pre-air supply line 105 for introducing pre-ad air to the carburetor 38 is provided between the air cleaner 37 and the carburetor 38, and the bleed air supply line 105 On the way, a lead air air cleaner 106 is provided so as to be disposed above the secondary air cleaner 79.

Next, the operation of this embodiment will be described. The cylinder axis C1 is inclined forward to A secondary air control valve 48 for controlling the supply of secondary air for exhaust to the exhaust port 44 of the engine E disposed below the engine frame 13 is provided for the intake device 40 disposed above the engine E. It is arranged between the carburetor 38 and the starter 50 mounted on the upper part of the engine E, and between the engine E and the main frame 13. Therefore, the secondary air control valve 48 is effectively disposed in the space created between the engine E and the main frame 13 with the cylinder axis C1 inclined forward and between the carburetor 38 and the starter motor 50. be able to. In addition, since the secondary air control valve 48 is located near the engine E, the secondary air supply line 8 connecting the secondary air control valve 48 and the exhaust port 44 of the engine E 6 can be shortened.

A secondary air cleaner 79 connected upstream from the secondary air control valve 48 is disposed on the opposite side of the carburetor 38 with respect to a center line C 2 passing through the center of the main frame 13 in the width direction. The carburetors 38 and the secondary air cleaner 79 are arranged at positions offset in the width direction of the body frame F, and the carburetors 38 and the secondary air cleaner 79 are placed in the narrow space between the engine E and the main frame 13. The air cleaner 79 can be effectively arranged.

Further, most of the secondary air supply line 86 is disposed on the opposite side of the carburetor 38 with respect to the center line C2 passing through the center of the main frame 13 in the width direction. The secondary air supply pipe 86 can be placed in the compact by moving it to the main frame 13 side.

Further, a negative pressure operated fuel cock 90 provided in the middle of a fuel supply line 88 to the carburetor 48 is disposed below the main frame 13 and beside the secondary air control valve 48. Since the fuel cock 90 is arranged beside the secondary air control valve 48 arranged between the gasifier 38 and the cell motor 50, the fuel cock 90 is attached to the carburetor 38. Can be brought close to each other, and the negative pressure extraction pipeline 100 that guides negative pressure from the intake device 40 to the fuel cock 90 can be shortened.

Further, since the fuel cock 90 is disposed on the opposite side of the carburetor 38 with the main frame 13 therebetween, the piping of the fuel supply line 88 and the negative pressure extraction line 100 can be facilitated. Monkey In addition, a fuel cock 90 is provided in the middle of the fuel supply line 88 extending from the fuel tank 25 to the front and connected to the carburetor 38, so that the fuel supply from the fuel tank 25 is stopped. Therefore, even if air enters the pipe section 8 b connecting the carburetor 38 and the fuel cock 90 in the fuel supply pipe 88, the air from the pipe section 88 b will be Even if the bleeding operation is omitted, the fuel can be quickly filled into the pipeline section 8 8b, and the carburetor 3 8 can be used while reducing the number of parts by eliminating the need for parts such as relief valves for air bleeding. Can be supplied promptly.

Further, since the fuel cock 90 is attached to the intake pipe 39 of the intake device 40, the arrangement of the fuel cock 90 is different from that in which the fuel cock 90 is attached to the fuel tank 25. The above degree of freedom can be increased.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.

Claims

1. On a body frame (F) equipped with a main frame (13) extending downward from the head pipe (12), the cylinder shaft (C1) is tilted forward and placed below the main frame (13). The engine (E) is suspended, and an intake device (40) including an air cleaner (37) and a carburetor (38) is disposed above the engine (E). A secondary air control valve (48) for controlling the supply of secondary air for exhaust to the port (44) is provided between the cell motor (50) mounted on the upper part of the engine (E) and the carburetor (38). An arrangement of a secondary air control valve for exhaust in a motorcycle, wherein the secondary air control valve is disposed between the engine (E) and the main frame (13).

2. A secondary air cleaner (79) connected to the secondary air control valve (48) on the upstream side of the carburetor across a center line (C2) passing through the center in the width direction of the main frame (13). The arrangement structure of a secondary air control valve for exhaust in a motorcycle according to claim 1, wherein the secondary air control valve is disposed on a side opposite to (38).

3. Most of the secondary air supply line (86) connecting the secondary air control valve (48) and the exhaust port (44) of the engine (E) is located at the center in the width direction of the main frame (13). The arrangement structure of a secondary air control valve for exhaust in a motorcycle according to claim 1, wherein the secondary air control valve is disposed on a side opposite to the carburetor (38) with respect to a center line (C2) passing therethrough.