JP2007120486A - Secondary air supply device of motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary air supply device capable of suppressing an arrangement space inside a motorcycle. <P>SOLUTION: The secondary air supply device 50 is provided with a resonator 60 on the right side of a vehicle body frame 11, a second air cleaner 61 on the downstream of the resonator 60 and at the center of the vehicle body frame 11, and a secondary air control valve 62 on the downstream of the second air cleaner 61 and at the left side of the vehicle body frame 11. A secondary air passage 51 connects between each of the above elements. The secondary air passage 51 is composed of a suction pipe 65 equipped near the resonator 60 for connecting between a secondary air suction port 64 and the secondary air cleaner 61, first piping 66 connecting between the secondary air cleaner 61 and the secondary air control valve 62, and second piping 67 for connecting between the secondary air control valve 62 and an exhaust pipe 45 of an engine 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a secondary air supply device for a motorcycle that supplies secondary air to an exhaust device of an engine.

  In recent years, as exhaust gas regulations for motorcycles have been strengthened, secondary air supply devices that purify exhaust gas by supplying secondary air to the exhaust device of the engine and burning combustible components in the exhaust gas have been used. ing.

In recent years, a technique for providing a secondary air supply device to a unit swing type motorcycle has been proposed (see, for example, Patent Document 1).
Japanese Patent No. 3302047 (FIG. 3)

  In FIG. 3 of Patent Document 1, the frame constituting the vehicle body includes main pipes 4a and 4b on the left and right. The main pipes 4a and 4b extend the support portions 7 and 7 to the rear, extend the inclined portions 7a and 7a obliquely upward and rearward from the rear half of the support portions 7 and 7, and the left and right inclined portions 7a and 7a. The rear end is connected by the connecting portion 8.

  A secondary air suction port 94 is provided in the vicinity of the connecting portion 8 located in the vicinity of the rear end of the vehicle body, and an air filter 85 (hereinafter referred to as an air cleaner 85) is disposed on the support portion 7 of the main pipe 4a. The control unit 100 is disposed below the support portion 7 of 4b, and the suction pipe 93 is connected between the suction port 94 and the air filter 85.

A suction port 94 is provided in the connecting portion 8 located at the rear end of the vehicle, and a suction pipe 93 connecting the suction port 94 and the air cleaner 85 is first extended forward along the right main pipe 4b, and then In the vicinity of the control unit 100, it was extended to the left in the width direction of the vehicle, and finally connected to an air cleaner 85 provided on the left main pipe 4a side.
Thus, by increasing the length of the suction pipe 93 from the suction port 84 to the air cleaner 85, the resistance when the secondary air flows through the suction pipe 93 is increased to attenuate the intake sound.

  However, since there is a limit to the space that can be used inside the motorcycle, it is desirable to reduce the space for arranging the secondary air supply device such as shortening the length of the suction pipe.

  It is an object of the present invention to provide a secondary air supply device that can reduce the arrangement space inside a motorcycle.

  The invention according to claim 1 is a motorcycle in which an engine including a transmission is swingably suspended at a rear portion of a vehicle body frame and a secondary air supply device that supplies secondary air to an exhaust device of the engine is connected. The secondary air supply device is characterized in that a secondary air cleaner is provided on the secondary air passage, and a resonator for attenuating the intake sound of the secondary air is provided upstream of the secondary air cleaner.

  The invention according to claim 2 is a motorcycle in which an engine including a transmission is swingably suspended at a rear portion of a vehicle body frame, and a secondary air supply device that supplies secondary air to an exhaust device of the engine is connected. The secondary air supply device is provided with a secondary air cleaner on the secondary air passage and in the center of the vehicle body frame, and a secondary air control valve is provided downstream of the secondary air cleaner and on the left and right sides of the vehicle body frame, A resonator is provided upstream of the secondary air cleaner and on the other side of the body frame.

  The invention according to claim 3 is characterized in that a storage box and a fuel tank are disposed at the front and rear of the rear portion of the vehicle body frame, and a secondary air cleaner is disposed between the storage box and the fuel tank.

  The invention according to claim 4 is characterized in that the resonator is disposed below a rear frame provided at a rear portion of the vehicle body frame.

  The invention according to claim 5 is characterized in that the secondary air cleaner is attached to the rear fender.

  In the invention according to claim 6, a secondary air control valve is provided in the secondary air passage, the secondary air cleaner is provided on the opposite side of the vehicle body frame in the left-right width direction with respect to the secondary air control valve, and 2 A resonator is provided behind the next air cleaner.

  The invention according to claim 7 is characterized in that the secondary air control valve is disposed in a substantially triangular space surrounded by a storage box, a fuel tank, and a vehicle body frame disposed below the passenger seat.

In the invention according to claim 1, since the secondary air supply device is provided with the resonator upstream of the secondary air cleaner, it is possible to attenuate the intake sound of the secondary air. Since the intake sound of the secondary air can be attenuated, the length of the secondary air passage can be shortened. Since the length of the secondary air passage can be shortened, the space necessary for the arrangement of the secondary air supply device can be suppressed.
As a result, the space inside the motorcycle can be used effectively.

In the invention according to claim 2, since the secondary air supply device is provided with a secondary air cleaner on the secondary air passage and in the center of the vehicle body frame, and a resonator is provided upstream of the secondary air cleaner and on the right side of the vehicle body frame. It is possible to shorten the length of the secondary air passage that connects between the secondary air cleaner and the resonator. Since the length of the secondary air passage can be shortened, the space necessary for the arrangement of the secondary air supply device can be suppressed.
As a result, the space inside the motorcycle can be used effectively.

In the invention which concerns on Claim 3, a secondary air cleaner is arrange | positioned between a storage box and a fuel tank.
Since there is a space between the storage box and the fuel tank, a secondary air cleaner can be disposed in this space.
Since the secondary air cleaner can be arranged in such a space, the space inside the motorcycle can be used effectively.

In the invention according to claim 4, the resonator is arranged below the rear frame.
Since there is sufficient space below the rear frame, a resonator can be placed in this space.
As a result, the space inside the motorcycle can be used effectively.

In the invention according to claim 5, the secondary air cleaner is attached to the rear fender.
Since the secondary air cleaner is usually attached to the vehicle body frame, a separate part such as a bracket is required.
In this regard, in the present invention, the rear fender is provided with a cleaner mounting portion so as to serve also as a mounting member for the secondary air cleaner, so that the number of parts can be reduced.

In the invention according to claim 6, the secondary air cleaner is provided on the opposite side of the vehicle body frame in the left-right width direction with respect to the secondary air control valve, and the resonator is provided behind the secondary air cleaner. Space can be taken widely.
As a result, the space inside the motorcycle can be used effectively.

In the invention which concerns on Claim 7, a secondary air control valve is arrange | positioned in the substantially triangular space enclosed between the storage box arrange | positioned under a passenger | crew seat, a fuel tank, and a vehicle body frame.
Since the secondary air control valve uses a dead space that is a substantially triangular space located on the inner side in the left-right width direction of the body frame, it can be arranged compactly. In addition, since the secondary air control valve does not protrude outside the vehicle body frame, it does not take up space in the width direction, and the motorcycle can be downsized.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “rear”, “left”, “right”, “upper”, and “lower” indicate directions viewed from the driver. The drawings are to be viewed in the direction of the reference numerals.
FIG. 1 is a side sectional view of a motorcycle provided with a secondary air supply device according to the present invention. The motorcycle 10 includes a link mechanism 14 including a pivot shaft 12 at a rear portion of a vehicle body frame 11. This is a vehicle in which a power unit 15 is swingably suspended from a body frame 11.

  The vehicle body frame 11 includes a head pipe 21 provided at the front end, a main frame 22 attached to the head pipe 21 and extending obliquely downward, a cross frame 23 attached to a rear end portion of the main frame 22, and the cross frame 23. It consists of rear frames 24L and 24R (only the reference numeral 24L on the front side is shown) constituting the rear part of the vehicle body frame 11 that rises obliquely rearward.

In the motorcycle 10, a front fork 25 is attached to the head pipe 21 so as to be steerable, a front wheel 28 is attached to the lower end of the front fork 25, and a steering handle 29 is attached to the upper portion of the front fork 25.
A rear wheel 30 is attached to the rear end of the power unit 15 also serving as a rear swing arm, and a rear cushion unit 26 is attached to each of the rear portion of the power unit 15 and the rear frame 24L.

  Specifically, the upper end portion 26a of the rear cushion unit 26 is attached to the rear portion of the rear frame 24L via the cushion bracket 27, and the lower end portion 26b of the rear cushion unit 26 is attached to the rear portion of the power unit 15.

The power unit 15 is an engine 31 including the continuously variable transmission 16 and is a member that also serves as a rear swing arm.
The link mechanism 14 interposed between the power unit 15 and the cross frame 23 is provided with a support shaft 33 in the vicinity of the cross frame 23, and a link member 34 is extended rearward from the support shaft 33. Is provided with a pivot shaft 12.

An intake device 37 and an exhaust device 38 are connected to the cylinder block 36 of the engine 31 constituting the front portion of the power unit 15.
The intake device 37 includes a primary air cleaner 41, a fuel supply device 42 connected to the primary air cleaner 41, and an intake pipe 43 connected to the fuel supply device 42 and supplying air-fuel mixture to the engine 31. The stays (not shown) are lowered from the rear frames 24L and 24R (only the front 24L is shown), and the primary air cleaner 41 is attached to these stays.

  The exhaust device 38 includes an exhaust pipe 45 connected to the engine 31 and extending rearward, and a silencer 46 connected to the exhaust pipe 45 and extended rearward.

A secondary air supply device 50 that supplies secondary air to the exhaust pipe 45 that is a part of the exhaust device 38 is attached to purify the exhaust gas discharged from the exhaust device 38.
That is, the secondary air supply device 50 that supplies the secondary air to the exhaust device 38 of the engine 31 is connected.
51 is a secondary air passage that connects between the exhaust device 38 and the secondary air supply device 50, and 52 is a control pipe that connects between the intake pipe 43 and the secondary air supply device 50.

A storage box 53 is disposed above the rear frames 24L and 24R, a fuel tank 54 is disposed behind the storage box 53, and a passenger seat 55 is attached from above the storage box 53 and the fuel tank 54 so as to be openable and closable.
In addition, the fuel piping etc. which connect between the fuel tank 54 and the engine 31 were abbreviate | omitted.
He is a helmet stored in the storage box 53.

  47 is an occupant step, 48 is a stand, 49 is a grab rail, 56 is a front brake unit, 57 is a front fender, 58 is a cowl member, and 59 is a rear fender.

FIG. 2 is a perspective view for explaining the arrangement of the secondary air supply device according to the present invention. The secondary air supply device 50 is provided with a resonator 60 on the right side of the vehicle body frame 11, downstream of the resonator 60 and on the vehicle body frame. 11 is provided with a secondary air cleaner 61, a secondary air control valve 62 is provided downstream of the secondary air cleaner 61 and on the left side of the vehicle body frame 11, and these elements are connected by a secondary air passage 51. It is.
The resonator 60 is a member having a function of attenuating intake sound generated when secondary air is inhaled.

  The secondary air passage 51 is provided in the vicinity of the resonator 60 from the upstream side to the downstream side, and a secondary air intake port 64 serving as a secondary air intake port, and between the secondary air intake port 64 and the secondary air cleaner 61. A first pipe 66 that connects between the secondary air cleaner 61 and the secondary air control valve 62, a secondary air control valve 62, and an exhaust pipe 45 of the engine 31 (see FIG. 1). It consists of the 2nd piping 67 which connects between.

  Then, the air sucked at the secondary air suction port 64 is guided to the secondary air cleaner 61 by the suction pipe 65 and cleaned, and the air cleaned by the secondary air cleaner 61 is transferred to the secondary air control valve 62 by the first pipe 66. Then, the secondary air control valve 62 opens and closes a valve (not shown), and supplies secondary air to the exhaust pipe 45 (see FIG. 1) via the second pipe 67.

  A control pipe 68 that controls opening and closing of the secondary air control valve 62 is connected to the secondary air control valve 62. By connecting this control pipe 68 to the intake pipe 43 (see FIG. 1), the valve is opened and closed by the negative pressure of the intake pipe 43. Specifically, the secondary air control valve 62 is configured to close when the negative pressure of the intake pipe 43 becomes larger than a predetermined value.

  That is, the secondary air supply device 50 is characterized in that a secondary air cleaner 61 is provided on the secondary air passage 51 and a resonator 60 that attenuates the intake air of the secondary air is provided upstream of the secondary air cleaner 61. To do.

Since the secondary air supply device 50 is provided with a secondary air cleaner 61 on the secondary air passage 51 and in the center of the vehicle body frame 11, and a resonator 60 is provided upstream of the secondary air cleaner 61 and on the right side of the vehicle body frame 11. The length of the suction pipe 65 that is one of the secondary air passages 51 that connect between the secondary air cleaner 61 and the resonator 60 can be shortened. Since the length of the suction pipe 65 can be shortened, a space necessary for the arrangement of the secondary air supply device 50 can be suppressed.
As a result, the space inside the motorcycle 10 can be used effectively.

  More specifically, the secondary air supply device 50 is provided with a secondary air cleaner 61 on the secondary air passage 51 and in the center of the left and right rear frames 24L and 24R, and on the downstream side of the secondary air cleaner 61 and the left rear frame. A secondary air control valve 62 is provided at 24L, and a resonator 60 is provided upstream of the secondary air cleaner 61 and at the right rear frame 24R.

  The resonator 60 is attached to the rear frame 24R, which is a part of the vehicle body frame 11, via a bolt 85, and the secondary air control valve 62 is attached to the rear frame 24L via a stay (not shown).

  69 and 69 are provided at both ends of the first pipe 66, a connection part for connecting the secondary air cleaner 61 and the first pipe 66, and a connection for connecting the first pipe 66 and the secondary air control valve 62. It is a hose clip which is provided in the part and tightens these connecting parts.

  Since the secondary air supply device 50 is provided with a secondary air cleaner 61 at the center of the left and right rear frames 24L and 24R, and a resonator 60 is provided on the right rear frame 24R upstream of the secondary air cleaner 61, the secondary air cleaner 61 and the resonator are provided. It is possible to shorten the length of the suction pipe 65 connecting between the 60. Since the length of the suction pipe 65 can be shortened, a space necessary for the arrangement of the secondary air supply device 50 can be suppressed.

  It should be noted that the resonator 60 may be provided in the left rear frame 24L provided in the vehicle body frame 11, and the secondary air control valve 62 may be provided in the right rear frame 24R.

  Since the resonator 60 is disposed below the right rear frame 24R, the space below the right rear frame 24R can be used effectively.

The secondary air cleaner 61 is attached to the rear fender 59.
Since the secondary air cleaner 61 is normally attached to the vehicle body frame 11 via a bracket, a part such as a bracket is required separately.

  In this regard, in the present invention, the mounting portion 63 of the secondary air cleaner 61 is provided on the rear fender 59 so as to serve also as the mounting member of the secondary air cleaner 61, so that the number of parts can be reduced.

FIG. 3 is a cross-sectional view of the main part of a motorcycle equipped with a secondary air supply device according to the present invention. A storage box 53 and a fuel tank 54 are arranged at the front and rear of the body frame 11, and the storage box 53 and the fuel tank A secondary air cleaner 61 is disposed between
Since the secondary air cleaner 61 is disposed between the storage box 53 and the fuel tank 54, a space necessary for the arrangement of the secondary air supply device 50 can be suppressed.

  In addition, 71 is an element built in the primary air cleaner 41, 72 is a radiator reserve tank, 73 and 73 are provided at both ends of the suction pipe 65, a connection part for connecting the resonator 60 and the suction pipe 65, and It is a hose clip that is provided at a connecting portion that connects between the first pipe 66 and the secondary air cleaner 61 and tightens these connecting portions.

4 is a view taken in the direction of the arrow 4 in FIG. 3, in which a resonator 60 is disposed below the right rear frame 24R, which is a part of the vehicle body frame 11, and a secondary air cleaner 61 is disposed between the storage box 53 and the fuel tank 54. 2 in a substantially triangular space 90 that is disposed between the storage box 53 disposed below the passenger seat 55 (see FIG. 1), the fuel tank 54, and the left rear frame 24L that is a part of the vehicle body frame 11. A secondary air control valve 62 is arranged.
That is, the secondary air control valve 62 is disposed in a substantially triangular space 90 surrounded by the storage box 53, the fuel tank 54, and the left rear frame 24L disposed below the occupant seat 55 (see FIG. 1).

  Since the secondary air control valve 62 uses a dead space which is a substantially triangular space 90 located on the inner side in the left-right width direction of the vehicle body frame 11, it can be arranged compactly. In addition, since the secondary air control valve 62 does not protrude to the outside of the body frame 11, it does not take up space in the width direction, and the motorcycle can be downsized.

Next, the operation of the secondary air supply device for the motorcycle described above will be described.
Returning to FIG. 2, since the secondary air supply device 50 is provided with the resonator 60 upstream of the secondary air cleaner 61, the intake air noise of the secondary air can be attenuated and the length of the secondary air passage 51 can be reduced. Can be shortened. Since the length of the intake pipe 65 constituting the secondary air passage 51 can be shortened, a space necessary for the arrangement of the secondary air supply device 50 can be suppressed.
As a result, the space inside the motorcycle 10 can be used effectively.

FIG. 4 is a diagram showing another embodiment of FIG. 2, and the points different from FIG. 2 will be mainly described.
The secondary air supply device 50B is provided with a secondary air cleaner 61B on the right side of the vehicle body frame 11 and below the right rear frame 24R that is a part of the vehicle body frame 11 on the right side, and downstream of the secondary air cleaner 61B and on the left rear frame. A secondary air control valve 62B is provided on the frame 24L, and a resonator 60B is provided upstream of the secondary air cleaner 61B and below the right rear frame 24R. Accordingly, the secondary air cleaner 61B is fixed to the right rear frame 24R.

  That is, the secondary air cleaner 61B is provided on the right rear frame 24R on the opposite side of the vehicle body frame 11 in the left-right width direction with respect to the secondary air control valve 62B, and a resonator 60B is provided behind the secondary air cleaner 61B.

Since the secondary air control valve 62B is provided on the left rear frame 24L, the secondary air cleaner 61B is provided on the right rear frame 24R, and the resonator 60B is provided behind the secondary air cleaner 61B, the rear frame 24L constituting the vehicle body frame 11, The storage space between 24R can be widened.
As a result, the space inside the motorcycle 10 can be used effectively.

  FIG. 5 is a side view of a rear cushion unit mounting portion according to another embodiment, in which a lower part of a rear frame 24L, which is a rectangular pipe that constitutes a part of the vehicle body frame 11 and has a vertically long rectangular cross section, is partially cut away. It shows that the upper end portion 26a of the cushion unit 26 is attached via the fastening member 74.

  6 is a cross-sectional view taken along line 6-6 in FIG. 5. The rear cushion unit mounting portion 75 includes a notch 76 provided at the lower portion of the rear frame 24, and a substantially cylindrical support member 77 welded to the notch 76. And an elastic member 78 fitted in the center of the support member 77 and a collar member 79 fitted in a hole 78a provided in the center of the elastic member 78. Then, the upper end portion 26a of the rear cushion unit 26 formed in a substantially U shape is fitted to the side surfaces on both sides of the elastic member 78 in the rear cushion unit mounting portion 75, and the space between the collar member 79 and the upper end portion 26a of the rear cushion unit 26 is between. A bolt 81 which is a part of the fastening portion 74 is passed through and fastened with a nut 82.

  By using the rear cushion unit mounting portion 75 having such a configuration, the cushion stroke of the rear cushion unit 26 can be increased as compared with the structure in which the rear cushion unit 26 is fixed via the cushion bracket. In addition, since the upper end portion 26a of the rear cushion unit 26 can be attached directly below the rear frame 24L, the width of the vehicle can be suppressed.

  The present invention is suitable for motorcycles.

1 is a side sectional view of a motorcycle including a secondary air supply device according to the present invention. It is a perspective view explaining arrangement of the secondary air supply device concerning the present invention. 1 is a cross-sectional view of a main part of a motorcycle including a secondary air supply device according to the present invention. FIG. 4 is a view taken along arrow 4 in FIG. 3. It is another Example figure of FIG. It is a side view of the rear cushion unit attachment part which concerns on another Example. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 16 ... Transmission, 24L, 24R ... Rear frame, 31 ... Engine, 38 ... Exhaust device, 50, 50B ... Secondary air supply device, 51 ... Secondary air passage, 53 ... Storage box, 54 ... fuel tank, 59 ... rear fender, 60, 60B ... resonator, 61, 61B ... secondary air cleaner, 62, 62B ... secondary air control valve, 90 ... substantially triangular space.

Claims (7)

In a motorcycle in which an engine including a transmission is swingably suspended at a rear portion of a vehicle body frame and a secondary air supply device that supplies secondary air to an exhaust device of the engine is connected.
The secondary air supply device is provided with a secondary air cleaner on a secondary air passage and a resonator for attenuating the intake air of the secondary air upstream of the secondary air cleaner. Air supply device. In a motorcycle in which an engine including a transmission is swingably suspended at a rear portion of a vehicle body frame and a secondary air supply device that supplies secondary air to an exhaust device of the engine is connected.
The secondary air supply device is provided with a secondary air cleaner on the secondary air passage and in the center of the vehicle body frame,
A secondary air control valve is provided downstream of the secondary air cleaner and on the left and right sides of the vehicle body frame,
A resonator is provided upstream of the secondary air cleaner and on the other side of the vehicle body frame,
A secondary air supply device for a motorcycle.   3. A storage box and a fuel tank are arranged at the rear of the vehicle body frame, and the secondary air cleaner is arranged between the storage box and the fuel tank. Secondary air supply device for motorcycles.   The secondary air supply device for a motorcycle according to claim 1, 2 or 3, wherein the resonator is disposed below a rear frame provided at a rear portion of the vehicle body frame.   The secondary air supply device for a motorcycle according to any one of claims 1 to 4, wherein the secondary air cleaner is attached to a rear fender. A secondary air control valve is interposed in the secondary air passage;
The said secondary air cleaner is provided in the left-right width direction opposite side of the said vehicle body frame with respect to the said secondary air control valve, and the said resonator is provided in the back of the said secondary air cleaner. Secondary air supply device for motorcycles. The said secondary air control valve is arrange | positioned in the substantially triangular space enclosed between the storage box arrange | positioned under a passenger | crew seat, a fuel tank, and a vehicle body frame, The one of Claims 1-6 characterized by the above-mentioned. The secondary air supply device for the motorcycle according to the description.

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