CN107554662B

CN107554662B - Motor bicycle

Info

Publication number: CN107554662B
Application number: CN201710514023.8A
Authority: CN
Inventors: 前田宪一
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2016-06-30
Filing date: 2017-06-29
Publication date: 2020-06-02
Anticipated expiration: 2037-06-29
Also published as: BR102017013867A2; JP6364446B2; CN107554662A; JP2018001956A

Abstract

The invention provides a motorcycle having a canister arrangement structure that is less likely to be subjected to the resistance of traveling wind. A motorcycle (1) is provided with: a main frame (5) extending rearward from the front vertical pipe (3); an engine (10) disposed below the main frame (5) with a cylinder axis (CL) directed vertically; a fuel tank (15) provided above the engine (10); and a canister (20) that traps evaporated fuel in the fuel tank (15), wherein the canister (20) is disposed below the main frame (5) such that at least a portion of the canister is located rearward of a cylinder head rear end (13re) of the engine (10) and above a cylinder head upper end (13ue) when viewed from the side of the vehicle.

Description

Motor bicycle

Technical Field

The present invention relates to a motorcycle having a canister.

Background

In a conventional motorcycle, a canister for adsorbing evaporated fuel generated in a fuel tank is provided in order to prevent the evaporated fuel generated in the fuel tank from being discharged into the atmosphere. In the motorcycle disclosed in patent document 1, a canister is disposed below a fuel tank provided so as to extend across a main frame extending rearward from a front vertical pipe. More specifically, the canister is disposed rearward of a down pipe extending downward from the head pipe and forward of an upper portion of a cylinder head of the internal combustion engine.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2015/174168

Disclosure of Invention

Problems to be solved by the invention

As disclosed in patent document 1, when the canister is disposed rearward of the down frame and forward of the upper portion of the cylinder head, the canister is likely to receive the traveling wind, and the traveling resistance may increase.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a motorcycle having a canister arrangement structure capable of suppressing a running resistance caused by running wind.

Means for solving the problems

In order to achieve the above object, the invention described in claim 1 is a motorcycle including: a main frame extending rearward from the front stand pipe; an engine disposed below the main frame with a cylinder axis directed upward and downward; a fuel tank disposed above the engine; and a canister that traps evaporated fuel in the fuel tank, wherein the canister is disposed below the main frame so that at least a part of the canister is located rearward of a rear end of a cylinder head of the engine and above an upper end of the cylinder head when viewed from a side of the vehicle.

The invention described in claim 2 is the motorcycle described in claim 1, wherein at least a part of the canister is disposed within a vertical range of the head cover in a vertical direction.

The invention described in claim 3 is the motorcycle described in claim 1 or 2, wherein at least a part of the canister is disposed so as to overlap the fuel tank when viewed from the side of the vehicle.

The invention described in claim 4 is the motorcycle according to any one of claims 1 to 3, wherein at least a part of the canister is disposed so as to overlap a side cowl covering a side surface of the vehicle when viewed from the side surface of the vehicle.

The invention described in claim 5 is the motorcycle according to any one of claims 1 to 4, wherein the canister is elastically supported by a support member attached to a lower portion of the main frame.

The invention described in claim 6 is the motorcycle according to any one of claims 1 to 5, wherein at least a part of the canister is located between a throttle valve and a cylinder of the engine in a front-rear direction.

The invention described in claim 7 is the motorcycle according to any one of claims 1 to 6, wherein a fuel pump is disposed on a straight line passing through an axis of the canister and a center of a throttle body when viewed from a side of the vehicle.

Effects of the invention

According to the invention of claim 1, since the canister is disposed below the main frame so that at least a part of the canister is located rearward of the rear end of the cylinder head of the engine and above the upper end of the cylinder head when viewed from the side of the vehicle, the entire canister can be prevented from receiving the traveling wind, and the resistance caused by the traveling wind can be reduced.

According to the invention of claim 2, since at least a part of the canister is disposed within the vertical range of the head cover in the vertical direction, the canister is hidden behind the head cover and is less likely to receive the traveling wind, and therefore the influence of the traveling wind can be reduced.

According to the invention of claim 3, since at least a part of the canister is arranged to overlap the fuel tank when viewed from the vehicle side, the canister can be hidden by the fuel tank when viewed from the vehicle side, and the design of the appearance is improved. Further, since the canister is provided in the vicinity of the fuel tank, the hose connecting the tank and the canister can be shortened.

According to the invention of claim 4, since at least a part of the canister is disposed at a position overlapping with the side cover covering the vehicle side surface when viewed from the side surface, the canister can be hidden by the side cover when viewed from the vehicle side surface, and the appearance is improved.

According to the invention of claim 5, since the canister is elastically supported by the support member attached to the lower portion of the main frame, the influence of the vibration of the vehicle body on the canister can be reduced, and the canister protection function can be improved.

According to the invention of claim 6, since at least a part of the canister is located between the throttle valve and the cylinder of the engine in the front-rear direction, it is possible to receive heat from the cylinder, efficiently vaporize the fuel in the canister, and shorten the path through which the vaporized fuel is supplied to the engine.

Drawings

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

Fig. 2 is a right side view of a main part of the motorcycle with the fuel tank, the seat, and the side cover removed.

Fig. 3 is a left side view of a main part of the motorcycle with the fuel tank, the seat, and the side cover removed.

Fig. 4 is a plan view of a main part of the motorcycle with the fuel tank, the seat, and the side cover removed.

Fig. 5 is a sectional view of the motorcycle taken along line a-a of fig. 3.

Description of the reference symbols

1: a motorcycle;

2: a frame;

3: a front riser;

5: a main frame;

10: an engine;

13 re: a cylinder head rear end;

13 ue: the upper end of the cylinder cover;

14: a cylinder head cover;

15: a fuel tank;

20: a filter tank;

30: a support member;

40: a side cover;

45: a throttle valve;

CL: the cylinder axis.

Detailed Description

An embodiment of a saddle type vehicle according to the present invention will be described below with reference to the drawings. In the following description, the front, the rear, the left, the right, the upper, and the lower of the vehicle are shown in the drawings as Fr, Rr, L, R, U, and D, respectively, in terms of the direction of the driver.

In fig. 1, a frame 2 of a motorcycle 1 includes: a front seat tube 3 that supports a front fork 18 and a handlebar 19 (see fig. 4) that pivotally support a front wheel FW so as to be steerable; a main frame 5 extending from the front seat pipe 3 high in front and low in rear; a pair of left and right seat rails 6, the front end portions of which are connected to the main frame 5 and extend rearward; a down frame 8 extending from the front end of the main frame 5 high in front and low in rear; and a pivot frame 7 coupled to a rear end portion of the main frame 5.

The engine 10 is disposed behind the down frame 8, below the main frame 5, and forward of the pivot frame 7. More specifically, the engine 10 is supported by the lower end portion of the down frame 8 and the pivot frame 7, and is mounted so as to be surrounded by the main frame 5, the down frame 8, and the pivot frame 7. Here, the engine 10 is mounted in such a manner that the cylinder axis CL points up and down. That is, with the crankcase 11 as the lower end portion, the cylinder 12 is disposed above the crankcase 11, the cylinder head 13 is disposed above the cylinder 12, the cylinder head cover 14 is further disposed above the cylinder head 13, and the cylinder axis CL is slightly inclined forward so that the cylinder head 13 is slightly forward of the crankcase 11. The term "point up and down" as used herein does not mean vertical, but includes forward inclination as in the examples.

The seat rail 6 is connected to a rear support frame 6a, and the rear support frame 6a is provided continuously to the pivot frame 7 and is inclined so as to be low in front and high in rear. The swing arm 55 is pivotally supported at its front end portion to the pivot frame 7, the rear wheel RW is pivotally supported at its rear end portion by the swing arm 55, and rear cushions 58 are provided between both end portions of the seat rail 6 and the swing arm 55.

A chain case 59 is provided along the swing arm 55 from the rear of the left side surface of the crankcase 11 to the rear end side of the swing arm 55, and a sprocket and a chain bridged over the sprocket are provided in the chain case 59, and the power of the engine 10 is transmitted to the rear wheel RW.

The upper surface of the vehicle body is covered with a fuel tank 15, a seat 16, and the like. That is, the fuel tank 15 is mounted on the main frame 5 above the engine 10, and the seat 16 on which the passenger sits is supported by the seat rails 6 and is disposed continuously with the rear end portion of the fuel tank 15.

A part of the vehicle body side surface is covered with the side cover 40. That is, the fuel tank 15 is covered with, for example, a plurality of continuous side covers 40a, 40b, and 40c (40) from the lower edge rear portion along the lower edge of the seat 16 to the vehicle body rear portion.

In fig. 2, an intake pipe 42 of the intake device 38 is connected to the rear side of the cylinder head 13. The intake device 38 includes: an air cleaner 48; a throttle body 41 connected to the air cleaner 48; an intake pipe 42 connecting the throttle body 41 and the cylinder head 13; and a connection pipe 49 connecting the air cleaner 48 and the throttle body 41. Here, referring also to fig. 3, a throttle valve 45 is provided in the throttle body 41. The throttle valve 45 is rotated by a throttle drum 45d provided on a side surface of the throttle body 41 and a throttle line 45w connected to the throttle drum 45 d.

On the other hand, an exhaust pipe 43 is connected to the front side of the cylinder head 13, and the exhaust pipe 43 extends forward of the engine 10, then extends downward, and passes below the engine 10 and extends rearward. An exhaust muffler 44 (see fig. 1) is connected to the exhaust pipe 43 so as to extend to the right of the rear wheel RW in a lower and upper direction. In the figure, reference numeral 51 denotes a battery, and reference numeral 52 denotes a fuel pump.

The motorcycle 1 is provided with a canister 20 for collecting evaporated fuel generated in the fuel tank 15. The canister 20 is formed in a cylindrical shape (see fig. 4 and 5) in its outer appearance, and has an adsorption chamber containing activated carbon therein, for example, so that the evaporated fuel is adsorbed by the activated carbon.

The canister 20 is attached to a position just below the main frame 5 on which the fuel tank 15 is placed, so that the axis P is oriented in the vehicle width direction, below the fuel tank 15 (see fig. 1). Therefore, as shown in fig. 2, when the fuel tank 15, the seat 16, and the side cover 40 are removed and the motorcycle 1 is viewed from the right, the circular canister right side surface 20R is visible, and as shown in fig. 3, when the fuel tank 15, the seat 16, and the side cover 40 are removed and the motorcycle 1 is viewed from the left, the circular canister left side surface 20L is visible.

The canister 20 includes: a filling port 24 through which evaporated fuel generated in the fuel tank 15 is introduced; a discharge port 25 for discharging the waste in the canister 20; an intake port 26 for introducing outside air into the adsorbed fuel; and a purge port 23 through which the fuel adsorbed in the canister 20 is discharged as purge gas by outside air. The charging port 24 and the purging port 23 are disposed on the canister left side surface 20L, and the discharging port 25 and the intake port 26 are disposed on the canister right side surface 20R.

As shown in fig. 3, the filling port 24 extends substantially vertically downward, and is connected to an unillustrated evaporated fuel introduction pipe connected to the fuel tank 15. The purge port 23 extends substantially vertically downward substantially in parallel with the charge port 24, and a purge pipe, not shown, connected to the engine intake system is connected thereto.

As shown in fig. 2, the intake port 26 extends rearward, and is connected to an intake pipe, not shown, that communicates with the atmosphere via the seat rail 6 and the like. The discharge port 25 extends substantially vertically downward and opens downward.

Since the purge pipe connected to the purge port 23 of the canister 20 is connected to the engine intake system, when the throttle valve 45 is rotated in the opening direction, for example, the negative pressure in the purge pipe is generated, and the outside air is introduced into the canister 20 through the intake port 26. When the adsorbed fuel is present in the canister 20, the fuel adsorbed in the canister 20 is sent as purge gas from the purge port 23 to the engine intake system through the purge pipe, and the purge gas is combusted in the engine 10.

As shown in fig. 2 to 4, the canister 20 is mounted by a support member 30 fixed to the main frame 5. Specifically, the stay 30 is a plate-like member extending in the vehicle front-rear direction so as to follow the inclination of the main frame 5, and is fixed to the left side surface 5a of the main frame 5 by a fixing screw 81 or the like. The canister 20 is supported at a lower portion of the support 30 at a substantially middle position in the front-rear direction. Here, the support structure of the canister 20 is a structure to be attached by a canister holder 28 described later.

The left attachment side surface 30Lw of the stay 30 is configured to hold the inclination sensor 37 in front of the canister 20 and to hold the ECU36 (see fig. 3) in rear of the canister 20. The right attachment side surface 30Rw of the stay 30 is configured to hold an ignition coil 35 and the like (see fig. 2).

In fig. 3, the mounting position of the canister 20 is vertically below the main frame 5 as described above, but at least a part of the canister 20 is located above a height position HL2 (horizontal phantom line in fig. 3) of the cylinder head upper end 13ue, and at least a part of the canister 20 is located rearward of a front-rear position HL1 (vertical phantom line in fig. 3) of the cylinder head rear end 13re in the vehicle front-rear direction.

At least a part of the canister 20 is disposed within the vertical range of the head cover 14 covering the cylinder head 13 in the vertical direction. That is, the lower end 20ue of the canister 20 is located below a height position HL3 (horizontal imaginary line in fig. 3) of the head cover upper end 14ue, and at least a lower portion of the canister 20 is arranged to be hidden by the head cover 14 when viewed from the front of the vehicle.

The canister 20 is disposed forward of the throttle valve 45. More specifically, canister 20 is located between a front-rear position SL of throttle valve 45 (vertical imaginary line in fig. 3) and a front-rear position YL of cylinder 12 (vertical imaginary line in fig. 3) in the vehicle front-rear direction, and is disposed close to engine 10. The fuel pump 52 is disposed on a straight line Q passing through the axis P of the canister 20 and the center of the throttle body 41 (more specifically, the throttle drum 45d) when viewed from the side of the vehicle.

As shown in fig. 1, the canister 20 of the present embodiment is disposed at least partially at a position overlapping the fuel tank 15 when viewed from the side of the vehicle. Here, the fuel tank 15 has a shape in which both left and right end sides extend to a position below the main frame 5 so as to straddle the main frame 5. Specifically, as shown in fig. 5, the canister 20 is disposed in a space surrounded by the bottom surface 15b of the fuel tank 15 at the upper and left and right sides, and when the canister 20 is viewed from the left and right sides of the vehicle, substantially the upper half portions of both canister side surfaces (the canister left side surface 20L and the canister right side surface 20R) are covered with the lower end portion 15de of the fuel tank 15.

Further, a side cover 40(40a) is disposed at the lower end 15de of the fuel tank 15. The side cover 40 is provided on both left and right sides of the vehicle so as to substantially cover the lower half portions and the rear half portions of the canister left side surface 20L and the canister right side surface 20R.

Thus, the canister left side surface 20L and the canister right side surface 20R are covered with the fuel tank 15 and the side cover 40 so as to be hardly visible from both the left and right sides.

The canister holder 28 described above will be explained with reference to fig. 3 and 5.

In fig. 3 and 5, the canister holder 28 has: an outer peripheral surface holding portion 28a for holding the case outer peripheral surface 20s of the canister 20 while surrounding the case outer peripheral surface in a cylindrical shape; a substantially U-shaped side surface holding portion 28b for regulating the position of the canister left side surface 20L from the left outer side; and a flange portion 28f locked to the stay 30. The flange portion 28f extends from the outer peripheral surface holding portion 28a in the vehicle longitudinal direction along the left attachment side surface 30Lw of the stay 30, and is formed with L-shaped engagement grooves 28h in side view.

On the other hand, a locking projection 31 (see fig. 3) having an L shape in side view, which is engaged with each of the pair of engaging grooves 28h, is formed on the left attachment side surface 30Lw of the canister holder 28. Therefore, the canister holder 28 is attached to the stay 30 by fitting the engagement groove 28h into the engagement projection 31.

Here, the canister holder 28 is formed of, for example, rubber. Therefore, the case outer peripheral surface 20s and the canister left side surface 20L of the canister 20 are securely held and elastically supported by the frictional force of the rubber.

As described above, according to the motorcycle 1 of the present embodiment, the canister 20 is disposed below the main frame 5 so that at least a part thereof is located rearward of the cylinder head rear end 13re of the engine 10 and upward of the cylinder head upper end 13ue when viewed from the vehicle side, and therefore, the entire canister 20 can be prevented from receiving the traveling wind, and the resistance caused by the traveling wind can be reduced.

Further, since at least a part of the canister 20 is disposed within the vertical range of the head cover 14 in the vertical direction, the canister 20 is hidden behind the head cover 14 and does not receive the traveling wind, and therefore the influence of the traveling wind can be reduced.

Further, since at least a part of the canister 20 is disposed so as to overlap the fuel tank 15 when viewed from the vehicle side, the canister 20 can be hidden by the fuel tank 15 when viewed from the vehicle side, and the design of the appearance is improved.

Further, since at least a part of the canister 20 is disposed at a position overlapping with the side cover 40 covering the vehicle side surface when viewed from the side, the canister 20 can be hidden by the side cover 40 when viewed from the vehicle side surface side, and the appearance is improved.

Further, since the canister 20 is elastically supported by the support member 30 attached to the lower portion of the main frame 5, the influence of the vehicle body vibration on the canister 20 can be reduced, and the canister protection function can be improved.

Further, since at least a part of the canister 20 is located between the throttle valve 45 and the cylinder 12 of the engine 10 in the front-rear direction, it is possible to receive heat from the cylinder 12, efficiently vaporize the fuel in the canister, and shorten the path through which the vaporized fuel is supplied to the engine 10.

The present invention is not limited to the above-described embodiments, and can be modified and improved as appropriate. For example, in the above-described embodiment, the fuel tank 15 and the side cover 40 cover a part of the side surface of the canister 20, but the fuel tank 15 or the side cover 40 may be made completely invisible from the side surface.

The stay 30 in the above-described embodiment is attached to the left side of the main frame 5, but may be attached to the right side. The support 30 is formed in a plate shape, but is not limited to such a structure.

Also, the support 30 may be resin, may be light metal, and may be sheet-metal processed.

Claims

1. A motorcycle (1), the motorcycle (1) comprising:

a main frame (5) extending rearward from the front vertical pipe (3);

an engine (10) disposed below the main frame (5) with a cylinder axis (CL) directed vertically;

a fuel tank (15) provided above the engine (10); and

a canister (20) that traps evaporated fuel in the fuel tank (15),

said motorcycle (1) being characterized in that,

the canister (20) is disposed directly below the main frame (5) such that at least a portion thereof is located rearward of a cylinder head rear end (13re) of the engine (10) and above a cylinder head upper end (13ue) when viewed from the side of the vehicle, and such that the axis thereof faces the vehicle width direction,

when the canister (20) is viewed from the left and right sides of the vehicle, substantially the upper half portions of both side surfaces of the canister (20) are covered with the lower end portion (15 de) of the fuel tank (15),

at least a part of the canister (20) is disposed within the vertical range of the head cover (14) in the vertical direction.

2. Motor-driven two-wheeled vehicle (1) according to claim 1,

at least a part of the canister (20) is arranged to overlap with a side cover (40) that covers a vehicle side surface when viewed from the vehicle side surface.

3. Motor-driven two-wheeled vehicle (1) according to claim 1,

the canister (20) is elastically supported by a support member (30) mounted on a lower portion of the main frame (5).

4. Motor-driven two-wheeled vehicle (1) according to claim 1,

at least a portion of the canister (20) is located between a throttle valve (45) and a cylinder (12) of the engine (10) in the front-rear direction.

5. Motor-driven two-wheeled vehicle (1) according to claim 1,

a fuel pump (52) is disposed on a straight line (Q) passing through the axis (P) of the canister (20) and the center of a throttle body (41) when viewed from the side of the vehicle.