JP6795633B2 - Funnel for intake device - Google Patents

Description

The present invention is a funnel having an upstream suction end portion that connects the air cleaner and the throttle body and is inserted into the purification chamber in the air cleaner, and the upstream suction end portion is an inner cylinder portion and the inner cylinder portion. The present invention relates to a funnel for an intake device, which is configured such that an outer cylinder portion surrounding the portion and a connecting portion connecting the inner cylinder portion and the outer cylinder portion have a substantially U-shaped cross-sectional shape.

Such a funnel for an intake device is known in Patent Document 1.

Japanese Unexamined Patent Publication No. 2012-1450474

In the one disclosed in Patent Document 1, when the air in the purification chamber in the air cleaner is sucked into the funnel from the upstream side suction end, the air flow is separated from the inner peripheral surface of the funnel and the effective diameter of the funnel. May become smaller.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a funnel for an intake device capable of increasing an effective diameter.

In order to achieve the above object, the present invention is a funnel having an upstream suction end portion that connects the air cleaner and the throttle body and is inserted into the purification chamber in the air cleaner, and the upstream suction end portion is used. A funnel for an intake device configured so that the inner cylinder portion, the outer cylinder portion surrounding the inner cylinder portion, and the connecting portion connecting the inner cylinder portion and the outer cylinder portion have a substantially U-shaped cross-sectional shape. In the connecting portion of the upstream suction end portion, a protrusion extending to the opposite side of the inner cylinder portion and the outer cylinder portion extends from the center in the radial direction on a projection plane orthogonal to the axis of the funnel. The first feature is that it is projected so as to extend along a straight line .

Further, the present invention is a funnel having an upstream suction end portion that connects the air cleaner and the throttle body and is inserted into the purification chamber in the air cleaner, and the upstream suction end portion is the inner cylinder portion and the inner cylinder portion. In an intake device funnel configured such that the outer cylinder portion surrounding the cylinder portion and the connecting portion connecting the inner cylinder portion and the outer cylinder portion have a substantially U-shaped cross-sectional shape, the connecting portion is The inner cylinder portion and the outer cylinder portion are formed so as to have an arcuate cross-sectional shape bulging on the opposite side to the outer cylinder portion, and are formed in a flat shape facing the outer side of the outer cylinder portion and of the outer cylinder portion. The inner cylinder portion and the protrusions protruding to the opposite side of the outer cylinder portion are projected from the connecting portion so as to have a planar portion arranged inward from the virtual extension surface passing through the outer peripheral surface. The second feature is that.

A third aspect of the present invention is that, in addition to the configuration of the second feature, the cross-sectional shape of the protruding end portion of the protruding portion from the connecting portion is an arc shape bulging in the same direction as the connecting portion. It is a feature.

In the present invention, in addition to any of the configurations of the first to third features, the protrusions are projected from the connecting portion at a plurality of positions spaced apart in the circumferential direction of the upstream suction end portion. This is the fourth feature.

The fifth feature of the present invention is that, in addition to the configuration of the fourth feature, the protrusions are arranged at equal intervals in the circumferential direction of the upstream suction end portion.

Further, in the sixth aspect of the present invention, in addition to the configuration of the fourth or fifth feature, the width of the protrusion is set to become narrower from the outer cylinder side toward the inner cylinder side. It is a feature of.

According to the first feature of the present invention, the air flow flowing from the purification chamber of the air cleaner through the suction end on the upstream side into the funnel becomes a straight line extending in the radial direction from the center on the projection plane orthogonal to the axis of the funnel. It is slowed down and rectified by the presence of a protrusion projecting from the connecting portion so as to extend along the line, and it is possible to suppress the separation of the air flow from the inner peripheral surface of the funnel and contribute to an increase in the effective diameter of the funnel.

Further, according to the second feature of the present invention, the cross-sectional shape of the connecting portion is an arc shape bulging on the side opposite to the inner cylinder portion and the outer cylinder portion, and the protrusion portion is on the outer side of the outer cylinder portion. Since it has a planar portion facing the outer cylinder and has a planar portion inside the virtual extension surface passing through the outer peripheral surface of the outer cylinder portion, a step portion is generated between the outer cylinder portion and the planar portion. As a result, a small vortex is generated on the outside of the planar portion, and the airflow that has flowed along the outer surface of the outer cylinder portion bypasses the vortex and largely goes around the upstream suction end and flows into the inner cylinder portion. As a result, the separation of the airflow from the inner peripheral surface of the funnel can be suppressed, and the effective diameter can be further increased.

According to the third feature of the present invention, the protruding end portion from the connecting portion of the protrusion has an arcuate cross-sectional shape, so that the airflow bypassing the vortex causes a vortex at the protruding end portion. The airflow smoothly flows from the protruding end portion into the inner cylinder portion without any problem, and the airflow flow space near the upstream suction end portion can be effectively secured, and the airflow can be introduced into the funnel.

According to the fourth feature of the present invention, for funnel formation, the effect of increasing the effective diameter of the funnel is achieved by the protrusions arranged at a plurality of positions spaced apart in the circumferential direction of the upstream suction end portion. It is possible to reduce the amount of extra material in the funnel and contribute to the weight reduction of the funnel.

According to the fifth feature of the present invention, since the protrusions are arranged at equal intervals in the circumferential direction of the upstream suction end portion, even if a plurality of protrusions are arranged, the entire circumference of the upstream suction end portion can be reached. By making it possible to obtain an even effect, it is possible to achieve the same effect as when arranged all around.

Further, according to the sixth feature of the present invention, since the width of the protruding portion becomes narrower toward the inner cylinder portion side, the outer cylinder portion side is directed toward the inner cylinder portion side having a smaller diameter than the outer cylinder portion. The shape continuity of the protrusion can be ensured, and the generation of vortices on the inner cylinder side can be suppressed.

It is a left side view of a motorcycle. It is a vertical sectional side view of a main part of an internal combustion engine. It is an enlarged view of the main part of FIG. It is a 4 arrow view of FIG. It is a perspective view of the vicinity of the protrusion of the upstream suction end portion. It is an enlarged view of the 6 arrow part of FIG.

Embodiments of the present invention will be described with reference to FIGS. 1 to 6 attached. In the following description, up and down, front and rear, and left and right refer to the directions seen by the occupant riding the motorcycle.

First, in FIG. 1, the body frame F of a motorcycle has a head pipe 13 that operably supports a front fork 11 that pivotally supports the front wheel WF and a steering handle 12, and a pair of left and right that extends downward from the head pipe 13. Main frame 14, a pair of left and right pivot frames 15 extending downward from the rear end of the main frame 14, a down frame 16 connected to the lower front end of the main frame 14 and extending downward, and a truss structure. The main frame 14 and the pivot frame 15 are integrally formed with a pair of left and right seat frames 17 extending rearward from the rear end portion of the main frame 14.

The engine body 18 of the internal combustion engine E mounted on the vehicle body frame F is arranged below the main frame 14 and is supported by the lower portion of the down frame 16, the rear portion of the main frame 14, and the lower portion of the pivot frame 15. Will be done. Further, the main frame 14 supports a fuel tank 19 arranged above the engine body 18, and a passenger seat 20 arranged behind the fuel tank 19 is supported by the seat frame 17.

In the pivot frame 15, the front end portion of the swing arm 22 that pivotally supports the axle 21 of the rear wheel WR at the rear end portion along the front-rear direction of the vehicle is oscillatingly supported via the pivot 23, and the internal combustion engine. The power exerted by E is transmitted to the rear wheel WR via a transmission device 24 including a drive chain 25.

In FIG. 2, the engine body 18 is coupled to a crankcase 29 that rotatably supports a crankshaft 28 having an axis extending in the vehicle width direction, and an upper end of the front portion of the crankcase 29, and extends upward upward. A cylinder block 30, a cylinder head 31 coupled to the upper end of the cylinder block 30, and a head cover 32 coupled to the upper end of the cylinder head 31 are provided.

The engine body 18 is configured as an in-line multi-cylinder in which a plurality of cylinders are arranged in the vehicle width direction, and in this embodiment, the engine body 18 is configured as an in-line two-cylinder engine. An exhaust device 33 is connected to the front side wall 31a of the cylinder head 31, and an intake device 34 is connected to the rear side wall 31b of the cylinder head 31.

The exhaust device 33 is individually connected to the front side wall 31a for each cylinder and extends downward in front of the engine body 18 to a pair of exhaust pipes 35 and downstream ends of the exhaust pipes 35. It is connected to the catalytic converter 36 (see FIG. 1) which is commonly connected and arranged below the engine body 18 and to the downstream end of the catalytic converter 36 so as to be arranged on the right side of the rear wheel WR. It is equipped with an exhaust muffler 37 (see FIG. 1).

With reference to FIG. 3, the intake device 34 includes a pair of intake pipes 39 connected to the rear side wall 31b of the cylinder head 31 and extending upward for each cylinder, and a throttle shaft to which a throttle valve 41 is fixed. A pair of throttle bodies 40 that rotatably support 42 and are connected to the intake pipe 39, an air cleaner 43 that is common to the pair of cylinders and is arranged above the engine body 18, and the throttle body 40. And a pair of funnels 44 connecting the air cleaners 43.

The rear side wall 31b of the cylinder head 31 is integrally provided with an intake connecting pipe 46 projecting upward while forming a part of the intake port 45, and the intake connecting pipes 46 are integrally provided for each cylinder. The downstream end of the intake pipe 39 is connected. Further, the downstream end of the throttle body 40 provided with the fuel injection valve 47 for ejecting fuel into the intake pipe 39 is connected to the upstream end of the intake pipe 39.

The air cleaner 43 has a cleaner case 48 supported by the main frame 14 of the vehicle body frame F, and the cleaner case 48 is divided into an unpurified chamber 50 and a purification chamber 51 so as to be divided into the unpurified chamber 50 and the purified chamber 51. A pair of left and right suction pipes 52 for sucking air from the outside into the unpurified chamber 50 are connected to the cleaner case 48, including a cleaner element 49 attached to the cleaner case 48.

Above the throttle body 40, the cleaner case 48 is provided with a connection hole 53 individually corresponding to each throttle body 40, and the funnel 44 having an upstream suction end 56 provides the connection hole 53. The upstream suction end 56 is airtightly penetrated into the purification chamber 51 to connect the throttle body 40 and the air cleaner 43.

With reference to FIG. 4, the funnel 44 has a pair of mounting boss portions 54 projecting laterally from the funnel 44 in the purification chamber 51, and the mounting boss portions 54 are screw members. It is fastened to the cleaner case 48 at 55.

The upstream suction end portion 56 is substantially U-shaped with an inner cylinder portion 56a, an outer cylinder portion 56b surrounding the inner cylinder portion 56a, and a connecting portion 56c connecting the inner cylinder portion 56a and the outer cylinder portion 56b. According to the present invention, the inner cylinder portion 56a and the protrusion 57 projecting to the opposite side of the outer cylinder portion 56b are formed on the connecting portion 56c so as to have the cross-sectional shape of the funnel. It is projected so as to extend along a straight line extending in the radial direction from the center on the projection plane orthogonal to .

The connecting portion 56c is formed so as to have an arcuate cross-sectional shape bulging on the side opposite to the inner cylinder portion 56a and the outer cylinder portion 56b, and the protrusion 57 is the upstream suction end portion 56. A plurality of locations spaced apart in the circumferential direction, and in this embodiment, 12 locations spaced apart in the circumferential direction are projected onto the connecting portion 56c.

With reference to FIG. 5, the protrusion 57 is formed in a flat shape facing the outer side of the outer cylinder portion 56b, and is formed from a circular virtual extension surface 58 passing through the outer peripheral surface of the outer cylinder portion 56b. Is formed so as to have a planar portion 57a arranged inward, and the cross-sectional shape of the protruding end portion 57b of the protrusion 57 from the connecting portion 56c is a circle bulging in the same direction as the connecting portion 56c. It is arcuate.

Further, the width W of the protrusion 57 is set so as to become narrower from the outer cylinder portion 56b side toward the inner cylinder portion 56a side.

Next, the operation of this embodiment will be described. The funnel 44 connecting the air cleaner 43 and the throttle body 40 has an upstream suction end 56 that is thrust into the purification chamber 51 in the air cleaner 43. The upstream suction end portion 56 is substantially U-shaped with an inner cylinder portion 56a, an outer cylinder portion 56b surrounding the inner cylinder portion 56a, and a connecting portion 56c connecting the inner cylinder portion 56a and the outer cylinder portion 56b. The connecting portion 56c is provided with a protrusion 57 projecting to the opposite side of the inner cylinder portion 56a and the outer cylinder portion 56b, so that the air cleaner 43 can be purified. The air flow from the chamber 51 through the upstream suction end 56 to the funnel 44 is slowed down and rectified by the presence of the protrusion 57 projecting from the connecting portion 56c, and in the absence of the protrusion 57. As shown by the chain line in FIG. 4, there is a possibility that the air flow is separated from the inner peripheral surface of the funnel 44, whereas the effective diameter of the funnel 44 is suppressed by suppressing the separation of the air flow from the inner peripheral surface of the funnel 44. Can contribute to the increase.

Further, the connecting portion 56c is formed so as to have an arcuate cross-sectional shape bulging on the side opposite to the inner cylinder portion 56a and the outer cylinder portion 56b, and faces the outer side of the outer cylinder portion 56b in a planar shape. The protrusion 57 having a planar portion 57a formed on the outer cylinder portion 56b and arranged inward of the virtual extension surface 58 passing through the outer peripheral surface of the outer cylinder portion 56b is projected onto the connecting portion 56c. As shown in FIG. 6, a small vortex 59 is generated on the outside of the planar portion 57a due to the stepped portion between the outer cylinder portion 56b and the planar portion 57a, and the outer surface of the outer cylinder portion 56b is formed. As shown by the arrow 60, the airflow flowing along the vortex 59 bypasses the vortex 59, largely goes around the upstream suction end portion 56, and flows into the inner cylinder portion 56a, whereby the funnel 44 The effective diameter can be further increased by suppressing the separation of the airflow from the inner peripheral surface of the.

Further, since the cross-sectional shape of the projecting end portion 57b of the protrusion 57 from the connecting portion 56c is an arc shape bulging in the same direction as the connecting portion 56c, the airflow bypassing the vortex 59 is said to be the same. The protruding end portion 57b of the protrusion 57 smoothly flows from the protruding end portion 57b into the inner cylinder portion 56a without causing a vortex, which effectively provides an air flow flow space near the upstream suction end portion 56. The airflow can be introduced into the funnel 44.

Further, since the plurality of protrusions 57 are projected from the connecting portion 56c at a plurality of locations spaced apart from each other in the circumferential direction of the upstream suction end portion 56, the funnel is provided by the protrusions 57 arranged at the plurality of locations. It is possible to reduce the amount of extra material for forming the funnel 44 so as to achieve the effect of increasing the effective diameter of the 44, and to contribute to the weight reduction of the funnel 44. In particular, since the protrusions 57 are arranged at equal intervals in the circumferential direction of the upstream suction end 56, an equal effect can be obtained over the entire circumference of the upstream suction end 56 even by arranging the plurality of protrusions 57. It is possible to achieve the same effect as arranging it all around.

Further, since the width W of the protruding portion 57 is set to become narrower from the outer cylinder portion 56b side toward the inner cylinder portion 56a side, the diameter is smaller than that of the outer cylinder portion 56b from the outer cylinder portion 56b side. The shape continuity of the protrusion 57 toward a certain inner cylinder portion 56a side can be ensured, and the generation of a vortex on the inner cylinder portion 56a side can be suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes are made without departing from the present invention described in the claims. Is possible.

34 ... Intake device 40 ... Throttle body 43 ... Air cleaner 44 ... Funnel 51 ... Purification chamber 56 ... Upstream suction end 56a ... Inner cylinder 56b ... Outer cylinder Part 56c ... Connecting part 57 ... Protruding part 57a ... Plane part 57b ... Protruding end part 58 ... Virtual extension surface W ... Width of the protruding part

Claims (6)

A funnel (44) having an upstream suction end (56) that connects the air cleaner (43) and the throttle body (40) and is inserted into the purification chamber (51) in the air cleaner (43). The upstream suction end portion (56) includes an inner cylinder portion (56a), an outer cylinder portion (56b) surrounding the inner cylinder portion (56a), the inner cylinder portion (56a), and the outer cylinder portion (56b). In an intake device funnel configured to have a substantially U-shaped cross-sectional shape with a connecting portion (56c) connecting the two.
At the connecting portion (56c) of the upstream suction end portion (56), a protrusion (57) projecting to the opposite side of the inner cylinder portion (56a) and the outer cylinder portion (56b) is formed with the axis of the funnel. A funnel for an intake device characterized in that it is projected so as to extend along a straight line extending in the radial direction from the center on orthogonal projection planes . A funnel (44) having an upstream suction end (56) that connects the air cleaner (43) and the throttle body (40) and is thrust into the purification chamber (51) in the air cleaner (43). The upstream suction end portion (56) includes an inner cylinder portion (56a), an outer cylinder portion (56b) surrounding the inner cylinder portion (56a), the inner cylinder portion (56a), and the outer cylinder portion (56b). In an intake device funnel configured to have a substantially U-shaped cross-sectional shape with a connecting portion (56c) connecting the two.
The connecting portion (56c) is formed so as to have an arcuate cross-sectional shape bulging on the side opposite to the inner cylinder portion (56a) and the outer cylinder portion (56b), and the outer cylinder portion (56b). A planar portion (57a) is formed so as to face the outer side and is arranged inward of the virtual extension surface (58) passing through the outer peripheral surface of the outer cylinder portion (56b) . the inner cylinder portion (56a) and the outer cylindrical portion protrusion that protrudes on the opposite side of (56b) (57), air intake device funnel you characterized by being protruded to the connecting portion (56c) .. The claim is characterized in that the cross-sectional shape of the protruding end portion (57b) of the protruding portion (57) from the connecting portion (56c) is an arc shape bulging in the same direction as the connecting portion (56c). 2. The funnel for the intake device according to 2. Claims 1 to 3 characterized in that the protrusions (57) are projected from the connecting portions (56c) at a plurality of locations spaced apart from each other in the circumferential direction of the upstream suction end portion (56). The funnel for an intake device according to any one of the items. The funnel for an intake device according to claim 4, wherein the protrusions (57) are arranged at equal intervals in the circumferential direction of the upstream suction end (56). 4. Or 5 according to claim 4, wherein the width (W) of the protrusion (57) is set to become narrower from the outer cylinder portion (56b) side toward the inner cylinder portion (56a) side. The funnel for the intake device described in.