JP7035819B2 - Canister layout structure for motorcycles - Google Patents

Description

An embodiment of the present invention relates to a technique for arranging a canister mounted on a motorcycle.

In recent years, canisters have been widely used to prevent the release of fuel stored in fuel tanks to the atmosphere. The canister is connected to the fuel tank and the intake passage of the engine via a hose. The canister adsorbs the evaporative fuel gas in the fuel tank to the adsorbent and sends the adsorbed evaporative fuel gas to the engine when the engine is started.
For example, in Patent Document 1, the canister is arranged inside the main frame, behind the cylinder assembly of the engine (hereinafter, simply referred to as "cylinder"), and above the crankcase.

Japanese Unexamined Patent Publication No. 2012-001119

The canister is preferably arranged below the fuel tank and around the rear part of the cylinder of the engine from the viewpoint of shortening the connection path length.
On the other hand, since heat tends to accumulate in the space behind the cylinder, it is necessary to consider heat in the layout design of the equipment in this space, especially when a high-output engine is mounted.
However, in the above-mentioned conventional technique, there is a problem that sufficient cold insulation is not ensured in this space.

The present invention has been made in consideration of such circumstances, and provides a canister arrangement structure for a motorcycle capable of arranging a canister behind the cylinder below the fuel tank while ensuring cold insulation of the space behind the cylinder. The purpose.

The canister arrangement structure of the motorcycle according to the present embodiment is generated in the main frame, the fuel tank mounted on the main frame, the cylinder assembly and the crankcase suspended on the main frame, and the fuel tank. A canister that adsorbs evaporative fuel is provided, and the canister is arranged below the main frame behind the cylinder assembly so that a part of the canister is arranged outside the main frame in the vehicle width direction . A wind guide portion for guiding the traveling wind to the back space of the cylinder assembly is provided on the front portion of the canister in the front-rear direction of the vehicle .
Further, the canister arrangement structure of the motorcycle according to the present embodiment includes a main frame, a fuel tank mounted on the main frame, a cylinder assembly and a crankcase suspended on the main frame, and the inside of the fuel tank. A canister that adsorbs the generated fuel vapor is provided, and the canister is arranged below the main frame behind the cylinder assembly so that a part of the canister is arranged outside the main frame in the vehicle width direction. The starter motor is arranged so as to partially overlap the canister in a side view, and the canister and the starter motor are provided so as to partially overlap both the canister and the starter motor in a side view. The breather chamber is further provided, and the upper surface of the breather chamber in the vehicle vertical direction is lower than the uppermost portion of the canister and the uppermost portion of the starter motor.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a canister arrangement structure for a motorcycle capable of arranging a canister behind the cylinder assembly below the fuel tank while ensuring cold insulation of the space behind the cylinder assembly.

A schematic plan view of a vehicle body to which the canister arrangement structure according to the embodiment is applied and peripheral devices attached to the vehicle body. Schematic left side view showing the vehicle body of FIG. 1 with a fuel tank added. Partially enlarged perspective view of the vehicle with the area around the engine enlarged. Schematic perspective of the canister available in the embodiment. The partially enlarged plan view around the space above the case in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
In the following embodiment, the canister arrangement structure of the two-wheeled vehicle according to the present invention will be described with an example of a motorcycle equipped with a four-cylinder engine, but the engine type is not limited to this as long as it is multi-cylinder. Further, the term of a motorcycle includes a motorcycle having two front wheels or two rear wheels.

In the following embodiments, the expressions of up / down, left / right, and front / back are based on the driver (rider) when the vehicle is on board. Further, in each figure, the front of the vehicle is indicated by an arrow FW, the rear of the vehicle is indicated by an arrow BW, the left side of the vehicle is indicated by an arrow L, the right side of the vehicle is indicated by an arrow R, the upper side of the vehicle is indicated by an arrow U, and the lower side of the vehicle is indicated by an arrow D. In each figure, for the sake of simplicity, some configurations may be omitted as appropriate.

First, the vehicle body 10 of the motorcycle having the canister arrangement structure according to the embodiment will be outlined with reference to FIGS. 1 to 3.
FIG. 1 is a schematic plan view of a vehicle body 10 to which the canister arrangement structure according to the embodiment is applied and peripheral devices attached to the vehicle body 10.
FIG. 2 is a schematic left side view showing the vehicle body 10 of FIG. 1 with the addition of the fuel tank 11.

In both FIGS. 1 and 2, only the configurations mainly arranged around the vehicle body frame 20 are shown, and the configurations of the front fork and the swing arm, which are not related to the canister 12 in terms of arrangement or function, are omitted from the illustration. There is.

The vehicle body frame 20 is a so-called twin spar type composed of, for example, a main frame 21 (23 to 26) and a rear frame 22 (22a, 22b). The canister arrangement structure according to the embodiment can be applied to various vehicle body frames 20 such as a double clade type.

In the twin spar type, as shown in FIGS. 1 and 2, the head pipe 23 arranged at the front of the vehicle body frame 20, the front head block 24 connected to the head pipe 23, and the left and right from the front head block 24. A pair of left and right tank frames 25 that branch to and extend diagonally backward and downward, and a body frame 26 that is connected to the rear end of the tank frame 25 and bends and hangs downward are integrated to form a main frame 21.

The main frame 21 has an annular shape in a plan view because the left and right tank frames 25 are expanded to the same extent as the width of the engine 13 and the body frame 26 is connected to the left and right tank frames 25. A bridge 27 connecting these body frames 26 to the left and right is bridged to the left and right bent portions of the body frame 26. A pair of left and right rear frames 22 are connected to the rear end of the tank frame 25 and the bridge 27. A fuel tank 11 is placed and fixed on the left and right rear frames 22 and the left and right tank frames 25.

The engine 13 is suspended from a plurality of points, for example, four points on the main frame 21 to form a part of the vehicle body.
The engine 13 includes a cylinder assembly 17 (hereinafter, simply referred to as “cylinder 17”) composed of a cylinder block 14, a cylinder head 15, and a head cover 16, and a crankcase 19 connected to the cylinder 17 with internal spaces connected to each other. It is composed.

The cylinder 17 is erected on the front portion of the upper surface of the crankcase 19 and is fixed to the suspension bracket 24a and the tank frame 25 protruding downward from the front head block 24.
The exhaust manifold 31 and the muffler 33 constituting the engine exhaust system are sequentially connected to the front side surface of the cylinder head 15. The exhaust manifold 31 extends downward from the cylinder head 15 and then bypasses the lower part of the engine 13 and extends rearward. The muffler 33 connected to the chamber 32 at the rear end of the exhaust manifold 31 extends rearward at a position where a part thereof protrudes from the vehicle body 10 in the vehicle width direction.

Further, FIG. 3 is a partially enlarged perspective view of the vehicle body 10 in which the periphery of the engine 13 is enlarged.
As shown in FIG. 3, the crankcase 19 is configured by combining two case members, an upper case 19a and a lower case 19b, with a horizontal mating surface.

A crankshaft is supported on the upper edge of the lower case 19b. A circular mug cover 34 is placed over this protruding portion of the crankshaft that protrudes from the left side surface of the crankcase 19.
Hereinafter, the space 38 below the main frame 21 and partitioned by the upper surface of the crankcase 19 at the back of the cylinder 17 is referred to as a “case upper space 38”.

Next, in addition to FIGS. 1 to 3, the canister 12 and its arrangement mode that can be used in the present embodiment will be described with reference to FIGS. 4 and 5.
FIG. 4 is a schematic perspective view of the canister 12 that can be used in the embodiment.

The canister 12 is, for example, a charcoal canister that adsorbs fuel vaporized by activated carbon, and has an outer shape such as a cylinder as shown in FIGS. 4 and 5. The canister 12 is connected to the intake passages of the fuel tank 11 and the engine 13 via a hose (not shown).

One end surface of the canister 12, for example, the rear end surface, is provided with an inlet port 40 to which an inlet hose for guiding the evaporated fuel gas generated in the fuel tank 11 into the canister 12 is connected. Further, on the same end face, an outlet port 39 to which an outlet hose for guiding the evaporated fuel gas adsorbed by the adsorbent such as activated carbon in the canister 12 to the purge valve or the throttle valve is provided is provided. Further, the other end surface 48 of the canister 12 is provided with an atmosphere opening port 41 that is open to the atmosphere.

The purge valve opens and closes according to the operating condition of the engine 13, and communicates or shuts off between the canister 12 and the intake passage such as the throttle body (not shown). When the intake hose is in the communicating state, the evaporated fuel gas adsorbed on the adsorbent of the canister 12 is sucked by the engine negative pressure generated in the intake hose and supplied to the engine 13.

Further, FIG. 5 is a partially enlarged plan view around the case upper space 38 in FIG. 1.
The canister 12 according to the embodiment is arranged behind the cylinder 17 and directly below the main frame 21 on the left side, as shown in FIG. 5, for example. That is, the canister 12 is arranged immediately beside the case upper space 38 on the opposite side of the clutch chamber.

A flexible mounting band 42 is mounted on the longitudinal side surface of the canister 12 all around the side surface of the canister 12. By inserting the canister fixing bracket 46 between the mounting band 42 and the canister 12, the canister 12 is held by the canister fixing bracket 46.

The canister 12 is fixed to, for example, a main frame 21 or a cylinder 17 via a canister fixing bracket 46. At this time, the canister 12 is attached so that the longitudinal direction of the canister 12 is substantially parallel to the main frame 21 and a part of the body portion 47 thereof is located outside the main frame 21 in the vehicle width direction.

Further, the body portion 47 of the canister 12 is adjusted so as to be arranged above the mug cover 34 and inside the mug cover 34 and the muffler 33 in the vehicle width direction. That is, when the vehicle body 10 is viewed from above as shown in FIG. 1, the left side surface line α of the body portion 47 of the canister 12 is closer to the vehicle center side than the left side surface line β of the mug cover 34 and the left side surface line γ of the muffler 33. Adjusted to be placed.

Further, the canister 12 is fixed, for example, with one end provided with the inlet port 40 and the outlet port 39 facing rearward and the other end surface 48 provided with the atmosphere opening port 41 facing the front side. On the front surface portion 48 of the canister 12, that is, the end surface provided with the atmospheric opening port 41, for example, a plate curved air guide portion 51 for guiding the traveling wind 50 to the space above the case 38 of the cylinder 17 is provided.

As shown in FIG. 4, for example, the wind guide portion 51 is a rib attached to the body portion 47 by welding or the like, and is along the outer half of the edge portion surrounding the front surface portion 48 in the vehicle width direction. Is provided. The wind guide portion 51 extends outward from the edge portion of the vehicle, and extends forward so that the front end portion 53 thereof protrudes outward in the vehicle width direction from the main frame 21.

The air guide portion 51 formed in this way attracts the traveling wind 50 flowing outside the vehicle width direction of the main frame 21, guides the traveling wind 50 along the front surface portion 48 of the canister 12, and flows into the space above the case 38. Let me.
The air guide portion 51 may be the front portion 48 itself of the canister 12 formed diagonally from the outside in the vehicle width direction toward the space above the case 38.

By the way, in the space above the case 38, the starter motor 54 is arranged on the left side of the main frame 21 on the right side. Further, on the left side of the starter motor 54, a breather chamber 57 formed by the breather cover 56 is arranged. The breather chamber 57 separates the oil mist agitated in the mission chamber into gas and liquid, and guides the oil mist to the mission chamber and the gas to the air cleaner.

The breather cover 56 may be integrated with the crankcase 19. Even when integrated, the breather chamber 57 is assumed to be arranged in the space above the case 38.

In the embodiment, the canister 12, the breather chamber 57, and the starter motor 54 are arranged in this order along the vehicle width direction.
Further, as shown in FIG. 2, the starter motor 54 is arranged so as to partially overlap the canister 12 in a side view.

Further, the breather chamber 57 is also provided so as to partially overlap both the canister 12 and the starter motor 54 between the canister 12 and the starter motor 54 in a side view. At this time, the upper surface of the breather chamber 57 in the vertical direction of the vehicle is arranged lower than the uppermost portion of the canister 12 and the uppermost portion of the starter motor 54.

Further, above the breather chamber 57, the ABS unit 61 is fixed to the main frame 21 via an ABS unit fixing bracket 59 floatingly supported by the main frame 21. At this time, the ABS unit 61 is adjusted and fixed so as to overlap the main frame 21 when viewed from the side of the vehicle.

When the ABS unit 61 is arranged in the space above the case 38 in this way, the canister 12 may be fixed to the ABS unit fixing bracket 59. At this time, the canister fixing bracket 46 is attached to the ABS unit fixing bracket 59 by welding or the like so that the ABS unit 61 is arranged at the rear of the canister 12.

As a result, the ABS unit 61 is arranged at a position slightly distant from the cylinder 17 and adjacent to the rear portion of the canister 12. Therefore, the ABS unit 61 arranged at this position can directly or indirectly receive the traveling wind guided by the wind guide portion 51.

According to the present embodiment, the following effects (1) to (8) are obtained by the above configuration.

(1) The canister 12 is arranged outside the space above the case 38.
Therefore, a sufficient gap can be secured between various devices such as the starter motor 54, the breather chamber 57, the ABS unit 61, the throttle body, and the rectify arranged in the space above the case 38. That is, it is possible to prevent the heat generated by the cylinder 17 in the space 38 above the case from accumulating due to the concentration of the equipment and deteriorating the performance and durability of these equipment.
Further, since a space margin is secured in the space above the case 38, the degree of freedom in arranging these various devices can be improved.
Further, at this position, it becomes easy to arrange a large canister 12 with enhanced functions of the canister 12.

(2) The canister 12 was placed immediately beside the space above the case 38 and directly below the main frame 21.
The fuel tank 11 is mounted on the main frame 21. Further, in the canister arrangement structure according to the embodiment, the throttle body is arranged above the canister 12 in the space above the case 38. Therefore, the canister 12 arranged at the above-mentioned position can be connected to the intake passages such as the fuel tank 11 and the throttle body with a short connection path.

(3) A wind guide portion 51 is provided on the front surface portion 48 of the canister 12.
The traveling wind 50 flowing immediately outside the main frame 21 is guided to the front surface portion 48 of the canister 12 by the wind guide portion 51, and is guided to the space above the case 38 as it is and flows into the canister 12. Therefore, if there is no running wind 50 and the wind guiding portion 51 that hit the canister 12, the running wind 50 that has passed to the rear of the vehicle as it is is guided to the space above the case 38, and the inside of the space 38 above the case is positively cooled. Can be done.

(4) The longitudinal direction of the canister 12 was aligned with the main frame 21.
By aligning the canister 12 along the main frame 21, a gap having a constant width is created between the main frame 21 and the canister 12, and the traveling wind 50 easily flows into the space above the case 38.

(5) The upper surface of the breather chamber 57 was lowered as compared with the canister 12 and the starter motor 54.
The breather chamber 57 is located in the center of the space above the case 38. Therefore, by suppressing the height of the breather chamber 57 more than that of the equipment arranged in the periphery, it is possible to secure a spatial margin in the space 38 above the case.

(6) The canister 12 was fixed to the ABS unit fixing bracket 59.
By sharing the fixing bracket between the ABS unit 61 and the canister 12, the number of parts can be reduced.
Further, since the ABS unit 61 is adjacent to the canister 12, a part of the traveling wind 50 guided by the canister 12 can be applied to the ABS unit 61 to efficiently cool the ABS unit 61.

(7) The body portion 47 of the canister 12 was arranged above the mug cover 34 and inside the vehicle body above the mug cover 34 and the muffler 33.
With such a canister arrangement structure, it is possible to effectively prevent the muffler 33 or the mug cover 34 from first contacting the ground and damaging the canister 12 when the vehicle falls.

(8) The canister 12, the breather chamber 57, and the starter motor 54 are arranged so that their positions overlap when viewed from the side.
With such an arrangement relationship, it is possible to secure the cold insulation of the space 38 above the case and compactly arrange various devices arranged on the back of the cylinder 17.

As described above, according to the canister arrangement structure according to the embodiment, the canister 12 can be arranged below the fuel tank 11 and behind the cylinder 17 while ensuring the cold insulation of the space 38 behind the cylinder 17.

Although embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention.
The embodiment can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the gist of the invention. The embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

10 ... Body, 11 ... Fuel tank, 12 ... Canister, 13 ... Engine, 14 ... Cylinder block, 15 ... Cylinder head, 16 ... Head cover, 17 ... Cylinder assembly (cylinder), 19 ... Cylinder case, 19a ... Upper case, 19b ... Lower case, 20 ... Body frame, 21 ... Main frame, 22 (22a, 22b) ... Rear frame, 23 ... Head pipe, 24 (24a) ... Front head block (suspended bracket), 25 ... Tank frame, 26 ... Body frame , 27 ... Bridge, 31 ... Exhaust Manifold, 32 ... Chamber, 33 ... Muffler, 34 ... Mag Cover, 38 ... Case Upper Space, 39 ... Outlet Port, 40 ... Inlet Port, 41 ... Air Open Port, 42 ... Mounting Band, 46 ... bracket for fixing the canister, 47 ... canister body, 48 ... front surface (other end), 50 ... running wind, 51 ... air guide, 53 ... front end, 54 ... starter motor, 56 ... breather cover, 57 ... Breather room, 59 ... ABS unit fixing bracket, 61 ... ABS unit.

Claims (5)

Mainframe and
The fuel tank mounted on the mainframe and
Cylinder assembly and crankcase suspended on the main frame,
A canister that adsorbs the evaporative fuel generated in the fuel tank is provided.
The canister is arranged below the main frame behind the cylinder assembly so that a part of the canister is arranged outside the main frame in the vehicle width direction, and is located on the front portion of the canister in the vehicle front-rear direction. , A canister arrangement structure for a motorcycle, characterized in that a wind guide portion for guiding a running wind to a space behind the cylinder assembly is provided . The canister arrangement structure for a motorcycle according to claim 1 , wherein a part of the air guide portion is arranged outside the main frame in the vehicle width direction. Mainframe and
The fuel tank mounted on the mainframe and
Cylinder assembly and crankcase suspended on the main frame,
A canister that adsorbs the evaporative fuel generated in the fuel tank is provided.
The canister is arranged behind the cylinder assembly and below the main frame so that a part of the canister is arranged outside the main frame in the vehicle width direction , and a part of the canister overlaps the canister in a side view. With the starter motor placed in
Between the canister and the starter motor, the canister and the starter
It is further equipped with a breather chamber that is provided so that both motors and a part of them overlap when viewed from the side.
A canister arrangement structure for a motorcycle, characterized in that the upper surface of the breather chamber in the vertical direction of the vehicle is lower than the uppermost portion of the canister and the uppermost portion of the starter motor . The canister arrangement structure for a motorcycle according to any one of claims 1 to 3 , wherein the longitudinal direction of the canister is parallel to the main frame. 1. Claim 1 comprising an ABS unit arranged adjacent to the canister.
The canister arrangement structure of the motorcycle according to any one of claims 4 .

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