KR100618728B1 - Arrangement of secondary air control valve for exhaust in motorcycle - Google Patents

Abstract

An engine disposed below the main frame by tilting the cylinder axis forward is suspended in a vehicle body frame having a main frame extending downward from the head pipe, and an intake apparatus including an air cleaner and a carburetor is provided. In an automatic two-wheeled vehicle arranged above, a secondary air control valve 48 for controlling the supply of secondary air for exhaust gas to the exhaust port of the engine E is attached to the upper portion of the engine E. It is disposed between the engine E and the main frame 13 as between the starting motor 50 and the carburetor 38. This makes it possible to effectively utilize the space between the main frame and the engine, to arrange the secondary air control valve, and to shorten the secondary air supply line.

Description

Arrangement structure of secondary air control valve for exhaust in automatic two-wheeled vehicle {ARRANGEMENT OF SECONDARY AIR CONTROL VALVE FOR EXHAUST IN MOTORCYCLE}

According to the present invention, an engine disposed on a lower side of the main frame by tilting the cylinder axis forward is attached to a vehicle body frame having a main frame extending downward from the head pipe. The invention relates to an automatic motorcycle in which an intake apparatus including an air cleaner and a carburetor is disposed above the engine, and more particularly, to an improvement in the arrangement structure of the exhaust secondary air control valve.

Conventionally, for example, as disclosed in Japanese Patent Laid-Open No. 2000-320326, it is disposed below the main frame under a riding seat supported by a seat rail extending rearward from the main frame. The structure in which the secondary air control valve which controls supply of the secondary air for exhaust to an engine is arrange | positioned is known.

By the way, in the said conventional thing, even if there is an empty space between a main frame and an engine by tilting the cylinder axis of an engine forward, a secondary air control valve is arrange | positioned behind the engine, and secondary air control The secondary air supply line connecting the valve and the engine becomes long.

This invention is made | formed in view of such a situation, and in the automatic motorcycle which arrange | positioned the secondary air control valve by utilizing the space between mainframe and engine effectively, and shortened the secondary air supply line. An object of the present invention is to provide an arrangement of the secondary air control valve for exhaust.

In order to achieve the above object, in the present invention, an engine disposed below the main frame by suspending the cylinder axis forward is suspended in a vehicle body frame having a main frame extending downward from the head pipe. In an automatic two-wheeled vehicle in which an intake apparatus including a cleaner and a carburetor is disposed above the engine, a secondary air control valve for controlling supply of secondary air for exhausting to an exhaust port of the engine includes: It is a 1st characteristic that it is arrange | positioned between the engine and the main frame as between the starter motor and the carburetor attached to the upper part of the.

According to this first feature, the space between the engine and the main frame having the cylinder axis inclined forward and between the carburetor of the intake apparatus disposed above the engine and the starting motor attached to the upper portion of the engine Secondary air control valve can be effectively arranged. In addition, since the secondary air control valve is arranged near the engine, the secondary air supply line connecting the secondary air control valve and the engine can be shortened.

In addition, the present invention, in addition to the configuration of the first feature, the carburetor, the secondary air cleaner connected to the secondary air control valve from the upstream side, through the center line passing through the center in the width direction of the main frame therebetween. The second feature is that the vaporizer and the secondary air cleaner are disposed at positions displaced in the width direction of the vehicle body frame, and the vaporizer and the vaporizer are disposed in a narrow space between the engine and the main frame. The secondary air cleaner can be effectively arranged.

The present invention, in addition to the configuration of the first feature, the majority of the secondary air supply line connecting the secondary air control valve and the exhaust port of the engine, the center line passing through the width direction center of the main frame The third feature is disposed on the side opposite to the carburetor, and according to this configuration, the carburetor and the secondary air supply line can be arranged compactly against the main frame side.

1 is a side view of a two-wheeled vehicle;

2 is a left side view of a two-wheeled vehicle near the engine;

3 is a right side view of an automatic motorcycle near the engine.

FIG. 4 is a view seen from the four arrows of FIG. 2 with the main frame omitted; FIG.

5 is an enlarged sectional view taken along line 5-5 of FIG. 3;

6 is an enlarged sectional view taken along line 6-6 of FIG. 2;

First, in FIG. 1, the vehicle body frame F of the two-wheeled vehicle is configured from a head pipe 12 that supports the front fork 11 so that steering is possible, and a head pipe 12. It is provided with the main frame 13 extended downward and extended, and a pair of left and right rear frames 14 ... which are connected to the rear part of the main frame 13, and are raised and extended rearward. The front wheel WF is rotatably supported by the shaft at the lower end of the front fork 11, and the steering wheel 15 is connected to the upper end of the front fork 11.

With reference to FIGS. 2 and 3, hanger plates 16... Are fixedly mounted on both side surfaces of the middle part of the main frame 13, respectively, and further rear parts of the main frame 13 are provided. On both sides a pivot plate 17 is fixedly mounted.

Below the main frame 13, the engine E which inclined the cylinder axis C1 forward was arrange | positioned, The engine E is supported by the said hanger plate 16 ... and the pivot plate 17. As shown in FIG. It is suspended in the vehicle body frame F as much as possible. In addition, on both sides of the engine E, a foot step 18 for placing a foot on the crew is provided.

The pivot plate 17 is provided with a cylindrical support shaft 20, and a pair of left and right rear forks 21... On both ends of the support shaft 20 are provided. The front end is supported so as to swing up and down, and the rear wheel WR is supported by the shaft between the rear ends of both rear forks 21...

The upper part of the rear wheel WR is covered with a rear fender 24 attached to the rear frame 14... And supported by the rear frame 14 .. above the rear fender 24. A fuel tank 25 is disposed. In addition, a tandem seat 26, which is a seat for riding, is disposed to cover the fuel tank 25, and a rear cushion unit is provided between the rear frame 14... And both rear forks 21. (27 ...) are provided respectively.

The vehicle body frame F is covered with a vehicle body cover 30 made of synthetic resin, and the vehicle body cover 30 is a pair of left and right mains covering both sides of the main frame 13. A pair of left and right leg shields fastened to the front part of both main frame side covers 31... With the frame side cover 31. (32 ...), the front top cover (33) connected to both leg shields (32 ...) with the head pipe (12) covered at the front side, and the head pipe (12) at the rear side. The upper cover 34 connected to the front top cover 33 by covering the main frame 13 from the upper side, and the lower cover 35 connected to the lower parts of both main frame side covers 31... 1 pair of left and right rear sides covering the rear part of the body frame F together with most of the fuel tank 25 from both sides And a server (36 ...).

4, the intake apparatus 40 including the air cleaner 37, the vaporizer 38, and the intake pipe 39 is disposed above the engine E. As shown in FIG.

On the upper part of the air cleaner 37, a pair of attaching plate portions 37a and 37a, which sandwich the main frame 13 from both sides, are integrally provided, and both of the attaching plate portions 37a and 37a are formed on the main frame 13. Both sides are fastened by bolts 41 and 41. That is, the air cleaner 37 is fixed to the main frame 13.

The upstream end of the vaporizer | carburetor 38 arrange | positioned above the cylinder head 42 in the engine E is directly connected to the air cleaner 37, and is the downstream end of the vaporizer | carburetor 38. Iv) the intake pipe 39 whose upstream end is connected is formed to be curved in a substantially C shape, and is connected to the intake port 43 disposed above the cylinder head 42 so that the intake pipe 39 can be connected to the intake pipe 39. The downstream end is connected to the upper side wall of the cylinder head 42.

The upstream end of the exhaust pipe 45 is connected to the lower sidewall of the cylinder head 42 so as to be connected to the exhaust port 44 disposed 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.

Secondary air for exhaust is supplied to the exhaust port 44 of the cylinder head 42 in the engine E. Secondary air control for controlling the supply of the secondary air to the exhaust port 44. A valve 48 is disposed between the engine E and the main frame 13 between the starter 50 and the carburetor 38 attached to the upper part of the crankcase 49 in the engine E. do.

In FIG. 5, the secondary air control valve 48 includes a diaphragm actuator 52, an on-off valve 53 in which the valve is closed by the diaphragm actuator 52, and the engine E. It consists of a reed valve 54 which permits only the flow of air to the exhaust port 44 side.

The diaphragm actuator 52 includes a casing 55, a diaphragm 56 sandwiching the periphery of the casing 55, and a metal rod having one end connected to a central portion of the diaphragm 56. and a rod 57.

The casing 55 is composed of a body 58 and a cover 59 which tightly sandwiches the periphery of the diaphragm 56 with each other and is fastened to the body 58. The cover 59 and A negative pressure chamber 60 is formed between the diaphragms 56 to face one surface of the diaphragm 56, and an atmospheric pressure chamber 61 between the body 58 and the diaphragm 56. ) Is formed. The connection pipe part 63 which has the fastening hole 62 is provided in the center part of the cover 59 at the front-end | tip, and the negative pressure extraction pipe line which passes through the said fastening hole 62 in the negative pressure chamber 60 ( 64 is connected to the connection pipe part 63, and the negative pressure extraction pipe path 64 is connected to the intake pipe 39 of the intake apparatus 40, as shown in FIG. Thereby, the negative pressure in the intake pipe 39 acts on the negative pressure chamber 60.

The rod 57 is supported to be movable in the axial direction by the body 58, and one end of the rod 57 is directly connected to the central portion of the diaphragm 56 at the atmospheric pressure chamber 61 side.

In such a diaphragm actuator 52, when the negative pressure in the intake pipe 39 increases, the diaphragm 56 is bent in the direction of decreasing the volume of the negative pressure chamber 60, and the rod 57 moves upward in FIG. It works.

The on-off valve 53 is provided between the valve housing 67, the valve body 68 fixedly attached to the other end of the rod 57, and the valve housing 67 and the valve body 68. Return spring 69, which is provided.

The valve housing 67 is composed of the body 58 and the suction cover 70 which is tightly fastened to the body 58. The body 58 has an air flow passage 71 and an air flow passage. A communication hole 72 for communicating the furnace 71 to the atmospheric pressure chamber 61, and a valve hole 73 disposed coaxially with the rod 57 via an upstream end of the air flow passage 71. And a valve seat 74 having the valve hole 73 opened in the center portion on the side opposite to the air flow passage 71, and a support cylinder portion 75 for coaxially inserting a portion into the valve hole 73. As a result, a rod 57 penetrating the valve hole 73 coaxially is fitted into the support cylindrical portion 75 so as to allow axial sliding.

A valve chamber 76 is formed between the body 58 and the suction cover 70. In addition, the suction cover 70 is integrally formed with a connecting pipe portion 77 which communicates with the valve chamber 76, and a downstream end of the pipe passage 78 is connected to the connecting pipe 77. However, the upstream end of the conduit 78 is connected to the secondary air cleaner 79, and the air introduction conduit 80 connected to the upstream end of the secondary air cleaner 79 is further provided near the head pipe 12. It extends forward along the main frame 13. Furthermore, the secondary air cleaner 79 is arrange | positioned on the opposite side to the vaporizer | carburetor 38 through the centerline C2 which passes through the width direction center of the main frame 13 in between.

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

Moreover, the return spring 69 is a coil shape surrounding the said support cylinder part 75, and the diaphragm 56 of the diaphragm actuator 52 which moves the valve body 68 away from the valve seat 74, ie, the diaphragm 56 The spring force in the direction to be bent toward the atmospheric pressure chamber 61 is exerted and provided between the body 58 and the valve body 68.

The reed valve 54 is supported by the valve support plate 82 which has the valve hole 81 in the center part, and is formed in disk shape, and enables the opening and closing of the said valve hole 81, The valve support plate 82 is The valve hole 81 is communicated with the downstream end of the air flow passage 71 to be hermetically sandwiched between the body 58 and the third cover 83 fastened to the body 58. In addition, a valve chamber 84 for storing the reed valve 54 is formed between the third cover 83 and the valve support plate 82, and is integrated with the third cover 83 by passing through the valve chamber 84. The upstream end of the secondary air supply line 86 is connected to the connection pipe part 85 provided with the furnace. However, the downstream end of the secondary air supply line 86 is connected to the lower portion of the cylinder head 42 via the exhaust port 44 of the cylinder head 42 of the engine E.

Moreover, most of the secondary air supply line 86 is arrange | positioned on the opposite side to the vaporizer | carburetor 38 through the center line C2 which passes through the width direction center of the main frame 13 in between.

This secondary air control valve 48 is fixed to the main frame 13 of the vehicle body frame F. As shown in FIG. That is, the stay 87 is fastened to the side surface of the main frame 13, and the support flange 58a which is integrally installed in the body 58 so as to contact the stay 87 from below. ) Is fastened to the stay 87.

The fuel tank 25 disposed below the tandem seat 26 and the vaporizer 38 disposed below the front of the fuel tank 25 extend downwardly from the fuel tank 25 to extend forward. A fuel cock 90 of negative pressure actuation type, which is connected by an 88 and which operates at the intake negative pressure of the engine E, is fitted in the middle of the fuel supply line 88.

In FIG. 6, the fuel cock 90 includes a casing 91, a diaphragm 92 sandwiching the periphery with the casing 91, and a valve body 93 fixed to a central portion of the diaphragm 92. And a return spring 94 provided between the casing 91 and the diaphragm 92.

The casing 91 is comprised as the cover 96 which clamps the body 95 and the periphery of the said diaphragm 92 mutually in an airtight manner, and is caulking by the body 95, The cover 96 And a negative pressure chamber 97 facing one surface of the diaphragm 92 between the diaphragms 92. In addition, the spring support plate 98 abuts on the inner surface of the cover 95 in the negative pressure chamber 97, and the return spring 94 deflects the diaphragm 92 to the side that increases the volume of the negative pressure chamber 97. The spring force in the direction is exerted so as to be compressed between the diaphragm 92 and the spring support plate 98.

The cover 96 is integrally provided with a connecting pipe part 99 which communicates with the negative pressure chamber 97, and the negative pressure extraction is made between the connecting pipe part 99 and the intake pipe 39 of the intake apparatus 40. It is connected by the pipeline 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 the body 95 can seat the valve body 93 fixedly attached to the center portion of the diaphragm 92. The valve seat 102 and the valve hole 103 which open a downstream end in the center part of the valve seat 102 are provided. In addition, in the fuel supply line 88, a pipe portion 88a connecting between the fuel tank 25 and the fuel cock 90 is connected to the body 95 so as to pass through the valve hole 103. Of the 88, the pipeline part 88b connecting between the vaporizer 38 and the fuel cock 90 is connected to the body 95 so as to pass through the valve chamber 101.                 

By the way, the intake pipe 39 is integrally provided with an attachment stay 39a protruding toward the fuel cock 90 side, and the fuel cock 90 is attached to a support plate 104 fastened to the attachment stay 39a. The flange portion 95a provided integrally with the body 95 is fastened. That is, the fuel cock 90 is attached to the intake pipe 39. In this state attached to the intake pipe 39, the fuel cock 90 is disposed on the side of the secondary air control valve 48 at the lower side of the main frame 13, and the carburetor is disposed between the main frames 13. It is arrange | positioned on the opposite side to 38.

In addition, a bleed air supply line 105 for introducing bleed air into the vaporizer 38 is provided between the air cleaner 37 and the vaporizer 38, and in the middle of the bleed air supply line 105, The air cleaner 106 for bleed air is provided so that it may be arrange | positioned above the said secondary air cleaner 79.

Next, the operation of this embodiment will be described. The cylinder axis C1 is inclined forward to control the supply of the secondary air for exhaust to the exhaust port 44 of the engine E disposed under the main frame 13. The secondary air control valve 48 is an engine between the vaporizer 38 of the intake apparatus 40 disposed above the engine E and the starter motor 50 attached to the engine E upper portion. It is arrange | positioned between (E) and the main frame 13.

Therefore, the secondary air control valve 48 is provided in the space which arises between the engine E and the main frame 13 which tilts the cylinder axis C1 forward, and between the vaporizer 38 and the starting motor 50, respectively. Can be effectively placed. In addition, since the secondary air control valve 48 is arranged near the engine E, the secondary air supply line connecting the secondary air control valve 48 and the exhaust port 44 of the engine E ( 86 can be shortened.

In addition, the secondary air cleaner 79 connected to the secondary air control valve 48 at an upstream side thereof is opposite to the vaporizer 38 with the center line C2 passing through the center in the width direction of the main frame 13 interposed therebetween. In the narrow space between the engine E and the main frame 13 so that the vaporizer | carburetor 38 and the secondary air cleaner 79 are arrange | positioned at the position which shifted the width direction of the vehicle body frame F. The vaporizer 38 and the secondary air cleaner 79 can be effectively arranged.

Furthermore, since most of the secondary air supply line 86 is disposed on the side opposite to the vaporizer 38 with the centerline C2 passing through the center in the width direction of the main frame 13 interposed between the vaporizer 38 and the secondary air. The supply line 86 can be closely attached to the main frame 13 side, and can be arrange | positioned compactly.

In addition, a negative pressure actuated fuel cock 90 fitted in the middle of the fuel supply line 88 to the vaporizer 38 is disposed on the side of the secondary air control valve 48 under the main frame 13. Since the fuel cock 90 is disposed on the side of the secondary air control valve 48 disposed between the vaporizer 38 and the starting motor 50, the fuel cock 90 can be brought close to the vaporizer 38. The negative pressure extraction pipe line 100 for introducing negative pressure into the fuel cock 90 from the intake device 40 can be shortened.

In addition, since the fuel cock 90 is disposed on the side opposite to the vaporizer 38 by sandwiching the main frame 13, the piping of the fuel supply line 88 and the negative pressure extraction line 100 can be facilitated.

Furthermore, since the fuel cock 90 is interposed in the middle of the fuel supply line 88 which extends downward from the fuel tank 25 and extends to the vaporizer 38, the fuel supply stops from the fuel tank 25. By the way, even if air mixes in the pipeline part 88b which connects between the vaporizer | carburetor 38 and the fuel cock 90 in the fuel supply line 88, at the time of subsequent refueling, from the pipeline part 88b Even if the air bleeding operation is omitted, the fuel can be quickly satisfied in the conduit portion 88b, so that parts such as a relief valve for bleeding are unnecessary, so that the part score can be reduced. ) Can be fueled quickly.

Furthermore, since the fuel cock 90 is attached to the intake pipe 39 of the intake apparatus 40, the arrangement of the fuel cock 90 is compared with the case where the fuel cock 90 is attached to the fuel tank 25. The degree of freedom of the image can be increased.

As mentioned above, although the Example of this invention was described, this invention is not limited to the said Example, It is possible to perform various design changes, without deviating from this invention described in the claim.

Claims (3)

An engine disposed below the main frame 13 by tilting the cylinder axis C1 forward to the vehicle body frame F having the main frame 13 extending downward from the head pipe 12. In an automatic two-wheeled vehicle in which E) is suspended and an intake apparatus 40 including an air cleaner 37 and a vaporizer 38 is disposed above the engine E, The starter motor 50 and the vaporizer which the secondary air control valve 48 which controls the supply of secondary air for exhaust to the exhaust port 44 of the engine E are attached to the upper part of the engine E. Arrangement structure of the secondary air control valve for exhaust in a two-wheeled vehicle characterized in that it is disposed between the engine (E) and the main frame (13) between (38). The secondary air cleaner (79) connected to the secondary air control valve (48) at an upstream side thereof is based on the center line (C2) passing through the center in the width direction of the main frame (13). Arrangement structure of the secondary air control valve for exhaust in an automatic motorcycle, characterized in that it is disposed in a position opposite to the carburetor (38). 2. The secondary air control valve (48) of claim 1, wherein the secondary air control valve (48) in a secondary air supply line (86) connects between the secondary air control valve (48) and the exhaust port (44) of the engine (E). A portion extending from the front and connected to the exhaust port 44 is disposed at a position opposite to the vaporizer 38 with respect to the center line C2 passing through the widthwise center of the main frame 13. An arrangement structure of a secondary air control valve for exhaust in an automatic motorcycle.

Images