JP7465905B2 - Air cleaner device - Google Patents

Description

The present invention relates to an air cleaner device that is mounted on a saddle-type vehicle and purifies the intake air supplied to an internal combustion engine.

Conventionally, in air cleaner devices, outside air is introduced into the unpurified chamber through an outside air introduction pipe, but in some cases, a rib formed integrally with the air cleaner case is provided in the unpurified chamber in order to direct the intake air toward the air cleaner element when the direction of the intake air flow introduced from the outside air introduction pipe is not facing the air cleaner element (see Patent Document 1). However, in such air cleaner devices, the rib formed integrally with the air cleaner case protrudes at a right angle to the intake air flow, and when the intake air hits the rib, the intake air flow is reflected and flows in the opposite direction to the incoming intake air flow, preventing it from flowing smoothly toward the air cleaner element, which raises concerns about a decrease in intake efficiency.
Also, there is an air cleaner device in which a curved rib is provided at the tip of an intake pipe that is separate from the air cleaner case in the unpurified chamber in order to send the intake air toward the air cleaner element (see Patent Document 2). However, in such an air cleaner device, it is not disclosed whether the height of the curved rib is formed to cover the entire height of the air cleaner element, and there is a risk that the entire surface of the air cleaner element cannot be effectively used.

International Publication WO2020/017119 International Publication WO2021/200021

The present invention provides an air cleaner device that improves intake efficiency by enabling the intake air introduced into the unpurified room from the outside air intake pipe to be sent smoothly to the air cleaner element without being reflected, and effectively utilizes the entire surface of the air cleaner element.

The present invention has been made in consideration of the above problems, and provides an air cleaner comprising an air cleaner case and an air cleaner element that purifies outside air introduced into the air cleaner case,
The interior of the air cleaner case is divided into a non-purified chamber and a purified chamber by a partition wall including the air cleaner element,
The air cleaner case includes a non-purified room side case and a purified room side case,
In the air cleaner device, the case on the non-purified room side has an inlet for introducing outside air,
an intake guide portion that guides the flow of outside air introduced into the air cleaner case toward the air cleaner element,
The unpurified room side case has an element facing wall surface facing the air cleaner element,
the intake guide portion has an intake guide wall that guides a flow of outside air introduced into the air cleaner case toward the air cleaner element,
The intake guide wall is disposed so as to form an obtuse angle with respect to the element facing wall surface,
The air cleaner device is characterized in that the vertical width of the intake guide wall is larger than the vertical width of the air cleaner element.

According to the above configuration, by arranging the intake guide wall of the intake guide section so that it forms an obtuse angle with the element-facing wall surface, reflection of the intake flow at the intake guide wall is prevented and the intake air is smoothly guided to the air cleaner element, and by making the height direction width of the intake guide wall larger than the height direction width of the air cleaner element, the intake flow is prevented from flowing around the back side of the intake guide wall and the intake air is urged toward the air cleaner element, making effective use of the air cleaner element and improving intake efficiency.

The present invention is also characterized in that the intake guide portion is an intake guide member that is a separate member from the air cleaner case.

According to the above configuration, by making the intake guide section an intake guide member that is a separate member from the air cleaner case, it becomes easy to make the intake guide member an appropriate size according to the size of the air cleaner element to be placed inside the air cleaner case, and it also becomes easy to manufacture the intake guide wall in an appropriate shape to guide the intake air toward the air cleaner element.

Further, in the present invention, the element facing wall surface has an intake flow orthogonal rib extending in a direction perpendicular to the intake flow,
The intake guide portion is disposed along the intake flow orthogonal rib.

With this configuration, the intake flow that cannot be captured by the intake guide section alone can be received by the intake flow perpendicular ribs and sent to the air cleaner element side.

The present invention is also characterized in that the element-facing wall surface has intake flow direction ribs arranged along the intake flow.

With this configuration, the intake air flow can be guided by the intake air flow direction rib, and the rigidity of the wall surface facing the element on the unpurified room side case can be increased.

Further, in the present invention, the intake guide portion is an intake guide member that is a separate member from the air cleaner case,
The intake guide member is fixed to the element-facing wall surface by a fixing member along the intake flow orthogonal rib,
The intake guide member has a protrusion that protrudes toward the element-opposing wall surface at an upstream end edge of the intake guide wall in the intake air flow direction.

According to the above configuration, when the intake guide member is fixed by the fixing member, the protrusion provided on the upstream edge of the intake guide wall in the intake flow direction is pressed against the element-facing wall surface, and the intake guide member receives a reaction force from the element-facing wall surface, generating a moment centered on the point fixed by the fixing member, and the downstream edge of the intake guide member in the intake flow direction is pressed against the intake flow perpendicular rib, reducing the gap between the intake guide member and the intake flow perpendicular rib, preventing the intake flow from detouring around and improving intake efficiency.

The present invention also relates to a saddle-type vehicle having the above air cleaner device.

The above configuration makes it possible to provide a saddle-type vehicle equipped with an air cleaner device that allows the intake air introduced into the unpurified chamber from the outside air intake pipe to be sent smoothly to the air cleaner element without being reflected, improving intake efficiency and making effective use of the entire surface of the air cleaner element.

The air cleaner device of the present invention allows the intake air introduced into the unpurified room from the outside air intake pipe to be sent smoothly to the air cleaner element without being reflected, improving intake efficiency and making effective use of the entire surface of the air cleaner element.

1 is an overall left side view of a motorcycle to which an intake structure for an internal combustion engine according to one embodiment of the present invention is applied; FIG. 2 is an enlarged right side view of a main portion of the vehicle shown in FIG. 1 . FIG. 2 is a left side view of the power unit, the intake system device, and the exhaust system shown in FIG. 1 . FIG. 3 is a plan view of FIG. 2 . FIG. FIG. 2 is a partial cross-sectional view taken along the crankshaft of the internal combustion engine of the power unit. 2 is a cross-sectional view of a main portion of the air cleaner device, taken horizontally along the center line of an outside air intake pipe. FIG. This is a front view of the intake guide member attached to the unpurified chamber side case. 2 is an exploded oblique view of the unpurified chamber side case and the intake guide member. FIG. FIG. FIG. 10 is an enlarged cross-sectional view of a main portion taken along line XI-XI in FIG. 8 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An intake structure for an internal combustion engine according to one embodiment of the present invention will now be described with reference to FIGS.
FIG. 1 shows a right side view of a scooter-type motorcycle 1 equipped with an intake structure for an internal combustion engine according to this embodiment.
In the explanations in this specification, the directions of front, back, left, right, and up and down follow the usual standard of the direction in which the motorcycle 1 of this embodiment moves straight ahead being the forward direction, and in the drawings, FR indicates the forward direction, RE indicates the rear, LH indicates the left, RH indicates the right, UP indicates the upward direction, and DW indicates the downward direction.

As shown in FIG. 1, a front body 1F and a rear body 1R are connected via a low floor portion 1C. A body frame F forming the skeleton of the vehicle body is generally composed of a down tube 3 and a main pipe 4.
That is, a down tube 3 extends downward from a head pipe 2 at the front part 1F of the vehicle body, bends horizontally at its lower end and extends rearward below the floor part 1C, and a pair of left and right main pipes 4 are connected to its rear end. The main pipes 4 form an inclined portion 4a that extends diagonally upward and rearward from the connected part, and the upper part of the inclined portion 4a is further bent to form a horizontal portion 4b that extends approximately horizontally rearward.

At the front body 1F, the head pipe 2 and the vertically oriented parts of the down tube 3 are covered from the front and rear by the front cover 1a and leg shield 1b, at the floor part 1C, the front and rear oriented parts of the down tube 3 are covered by the lower side cover 1c, and at the rear body 1R, the main pipe 4 is covered on the left, right and rear sides by the body cover 1d.

A storage box 5 and a fuel tank (not shown) are supported at the front and rear between the pair of main pipes 4, and a seat 7 is disposed to cover the storage box 5 and the fuel tank.
At the front portion 1F of the vehicle body, a handlebar 8 is provided above and journalled on the head pipe 2, and a front fork 9 extends below and has a front wheel 10 journalled at its lower end.

A support bracket 11 protrudes rearward from approximately halfway along the longitudinal direction of the inclined portion 4a of the main pipe 4. As shown in FIG. 2, a hanger 22h protrudes diagonally upward from the top of the power unit P. The support bracket 11 of the main pipe 4 and the hanger 22h are connected via a link member 12, and these link mechanisms connect and support the power unit P to the main pipe 4 so that it can swing.

Referring to FIG. 3, the power unit P has a single-cylinder, four-stroke, air-cooled internal combustion engine 20 at the front. The crankcase 22 supports the crankshaft 21 oriented in the vehicle width direction, and the cylinder block 23, cylinder head 24, and head cover 25 are stacked in sequence from the crankcase 22, which protrudes forward in a position that is tilted forward to a nearly horizontal position.

Referring to FIG. 6, the crankcase 22 is split into a left crankcase portion 22L and a right crankcase portion 22R, and the crankshaft 21, which is oriented in the vehicle width direction, is rotatably supported by the left crankcase portion 22L and the right crankcase portion 22R via main bearings 21b, 21b, respectively.

An AC generator 55 is provided on the right side of the crankshaft 21, and a centrifugal cooling fan 56 is attached integrally to an outer rotor 55r of the AC generator 55.
A fan cover 57 that covers the right crankcase portion 22R from the right side houses the centrifugal cooling fan 56. Referring also to Figure 2, the fan cover 57 is formed with a grill 57g that serves as an outside air inlet facing the centrifugal cooling fan 56.

As shown in Figure 6, the left crankcase 22L extends rearward and doubles as the transmission case, and the transmission case (left crankcase) 22L is covered from the left side by a transmission case cover 65, with the belt-type continuously variable transmission 60 disposed inside. A drive chain sprocket 58 is provided adjacent to the main bearing 21b on the left shaft portion of the crankshaft 21, and a drive pulley 61 of the belt-type continuously variable transmission 60 is provided on the left shaft end.

Power is transmitted to the valve mechanism on the cylinder head 24 side by a cam chain 59 that is wound around a drive chain sprocket 58 .
1 and 3, the reduction gear output shaft of the reduction mechanism 64 provided at the rear of the belt-type continuously variable transmission 60 is the rear axle 28a, and the rear wheel 28 is provided on the rear axle 28a.
A rear cushion (not shown) is interposed between the upper end of the rear part of the transmission case portion 22L, which houses the reduction gear mechanism 64, and the upper bent portion of the main pipe 4.

As shown in FIG. 3, a driven pulley 63 of the belt-type continuously variable transmission 60 is journalled on a reducer input shaft 64a of the reduction mechanism 64, and a belt 62 is wound around a drive pulley 61 provided on the crankshaft 21 and the driven pulley 63 provided on the reducer input shaft 64a, so that the power of the internal combustion engine 20 is transmitted to the driven pulley 63 via the belt 62, and the rotation of the driven pulley 63 is transmitted to the reducer input shaft 64a of the reduction mechanism 64 via a centrifugal clutch (not shown), and the power is reduced by the reduction mechanism 64 and transmitted to the rear wheel 28.
As shown in FIG. 6, the left half of the drive pulley 61 is provided with an outside air intake fan 61F.

The cylinder block 23 and cylinder head 24 are surrounded by a shroud 70 as shown in FIG. 6, and the shroud 70 is connected to the fan cover 57 on the right side.

3, the internal combustion engine 20 at the front of the power unit P is configured such that a cylinder block 23 protruding forward from a crankcase 22 is placed on top of a cylinder head 24 which further protrudes forward, and a head cover 25 is placed on top of the cylinder head 24. An intake port 24a is formed on the upper surface of the cylinder head 24, and an inlet pipe 31 serving as an intake pipe extends upward from the intake port 24a. An exhaust port 24b is formed on the lower surface of the cylinder head 24, and an exhaust pipe 51 extends downward from the exhaust port 24b. A fuel injection valve 37 is attached to the upper surfaces of the throttle body 33 and the inlet pipe 31, respectively, to inject fuel into the intake passage.
An ignition plug 26 is inserted into the cylinder head 24 near the center of the head cover 25, and an oxygen concentration sensor 27 is inserted into the cylinder head 24 at the location where the exhaust pipe 51 extends.

An intake device 30 that draws in outside air and sends it to the internal combustion engine 20 is connected to the intake port 24a of the internal combustion engine 20. Inside the intake device 30 is an intake passage (not shown) through which the intake air that is sent to the internal combustion engine 20 passes and introduces the intake air into the combustion chamber 20a of the internal combustion engine 20.
The intake device 30 comprises an air cleaner device 40 that takes in and purifies outside air, a connecting tube 36 connected to the air cleaner device 40, a throttle body 33 connected to the downstream side of the connecting tube 36, and an inlet pipe 31 connected to the upstream side of the throttle body 33, and these together form the intake system.

As shown in FIG. 5, an exhaust device 50 is connected to the exhaust port 24b of the cylinder head 24. An exhaust pipe 51 that is connected to the exhaust port 24b and extends downward from the underside of the cylinder head 24 bends diagonally forward to the left, then bends from the rear to the right, bends from the left side of the lower part of the crankcase 22 to the right side, extends rearward and is connected to a muffler 52 disposed on the right side of the rear wheel 28. A catalytic device 53 is provided midway through the exhaust pipe 51, and these together form the exhaust system.

Further description will be given of the intake device 30. As shown in Fig. 4, the air cleaner device 40 of the intake device 30 has an air cleaner case 41 which is formed by combining a left and right unpurified chamber case 42 and a purified chamber case 43, and is partitioned into an unpurified chamber Ca on the unpurified chamber case 42 side and a purified chamber Cb on the purified chamber case 43 side by a partition wall 44 which is disposed between the unpurified chamber case 42 and the purified chamber case 43 and which is composed of an air cleaner element 44a and an element holder 44b.
3, an outside air intake pipe 47 for taking in wind generated while traveling and the like is disposed in the unpurified chamber case 42 with an intake port 47a for introducing outside air facing forward. The intake air introduced from the intake port 47a passes through the unpurified chamber Ca and is purified as it passes through the air cleaner element 44a, and is sent to the purified chamber Cb. The purified chamber Cb of the air cleaner device 40 is connected to the throttle body 33 by an elastically deformable connecting tube 36 made of rubber.

As shown in FIG. 7, an intake guide member 46 is provided in the air cleaner case 41 of the air cleaner device 40 of the intake device 30 as an intake guide section for smoothly directing the intake air introduced into the air cleaner case 41 toward the air cleaner element 44a. In this embodiment, the intake guide section is an intake guide member 46 that is separate from the air cleaner case 41, but it may be formed integrally with the air cleaner case 41.

The air cleaner case 41 is an integrated case consisting of the unpurified chamber case 42 and the purified chamber case 43, and is divided into an unpurified chamber Ca and a purified chamber Cb by a partition wall 44 consisting of an air cleaner element 44a and an element holder 44b sandwiched between the unpurified chamber case 42 and the purified chamber case 43.

Referring to Figures 7 and 10, the air cleaner element 44a has a generally rectangular parallelepiped shape and is held by an element holder 44b. The element holder 44b has a wall portion 44c that separates the unpurified chamber Ca from the purified chamber Cb, and the wall portion 44c is formed in a shape that corresponds to the shape of the joining surface between the unpurified chamber side case 42 and the purified chamber side case 43. The periphery of the wall portion 44c is provided with mounting pieces 44d that protrude from both sides of the wall portion 44c.

8 and 9, the unpurified room side case 42 has a side wall portion 42a serving as an air cleaner facing wall surface facing the air cleaner element 44a, and a peripheral wall portion 42b standing on the side wall portion 42a so as to surround the periphery thereof.
The front of the peripheral wall 42b is an inlet pipe mounting wall 42c to which an outside air inlet pipe 47 for introducing outside air is attached. An inlet pipe insertion hole 42d through which the outside air inlet pipe 47 passes is formed in the inlet pipe mounting wall 42c.

As shown in Figures 3 and 7, an inlet pipe surrounding wall 42k is formed in front of the inlet pipe mounting wall 42c so as to surround and cover the front and the up and down directions of the attached outside air inlet pipe 47. As shown in Figure 2, the left side surface of the inlet pipe surrounding wall 42k is an outside air intake opening 42j that is opened so that outside air can be introduced into the outside air inlet pipe 47.

The outside air is taken in through the outside air intake opening 42j, and is guided by the intake pipe surrounding wall 42k to the upper end opening of the outside air intake pipe 47, so that the outside air is introduced into the unpurified room Ca through the outside air intake pipe 47.

As shown in Figures 7 and 9, the edge 42h of the peripheral wall portion 42b of the unpurified chamber side case 42 has a fitting recess 42i formed around the circumferential direction into which the mounting piece 44d of the element holder 44b is fitted.

As shown in FIG. 9, the side wall 42a of the unpurified chamber side case 42 is formed with an intake air flow orthogonal rib 42e that protrudes toward the inside of the case and is arranged so as to be approximately perpendicular to the intake air flow direction flowing from the outside air inlet pipe 47 into the unpurified chamber Ca, and an intake air flow direction rib 42f that is arranged so as to be approximately parallel to the intake air flow direction flowing from the outside air inlet pipe 47 into the unpurified chamber Ca. Two intake air flow direction ribs 42f are provided so as to be approximately parallel to each other. The intake air flow orthogonal rib 42e is higher than the intake air flow direction rib f.

The side wall 42a is formed with a generally cross-shaped mounting protrusion 42g that protrudes inward to mount the intake guide member 46. A screw hole is formed in the center of the mounting protrusion 42g into which a screw 48 is screwed as a fixing member for fixing the intake guide member 46.

As shown in Figure 4, the purification chamber side case 43 has a side wall portion 43a facing the air cleaner element 44a, and a peripheral wall portion 43b erected on the periphery of the side wall portion 43a. As shown in Figures 7 and 9, a fitting recess 43i into which the mounting piece 44d of the element holder 44b is fitted is formed in the circumferential direction on the end edge 43h of the peripheral wall portion 43b.

When the mounting piece 44d of the element holder 44b is fitted into the fitting recess 42i of the unpurified chamber case 42 and the fitting recess 43i of the purified chamber case 43, and the unpurified chamber case 42 and the purified chamber case 43 are integrated with a fixing member such as a bolt (not shown), the element holder 44b is held in the air cleaner case 41. As shown in FIG. 4, the air cleaner case 41 is divided into an unpurified chamber Ca and a purified chamber Cb by a partition wall 44 composed of an air cleaner element 44a and an element holder 44b.

9 and 11, the intake guide member 46 attached to the side wall 42a of the unpurified-chamber side case 42 includes an intake guide wall 46a that guides the intake air introduced from the outside air introduction pipe 47 into the unpurified chamber Ca toward the air cleaner element 44a, and side wall portions 46b on both sides of the intake guide wall 46a. The inner wall surface of the side wall portion 46b is formed so as to be continuous with the inner wall surface of the intake guide wall portion 46a, and directs the intake air flowing toward the side wall portion toward the intake guide wall portion 46a.
As shown in FIG. 8, the intake guide member 46 is fixed to the unpurified chamber side case 42 by screwing in a screw 48 as a fixing member along the intake air flow orthogonal rib 42e.

As shown in Figure 11, the intake guide wall portion 46a is formed so that the angle θ between the imaginary line L1 connecting its upstream edge 46d and downstream edge 46e and the wall surface L2 of the side wall portion 42a of the unpurified chamber side case 42 is an obtuse angle. Furthermore, the wall surface of the intake guide wall portion 46a is curved so as to be recessed toward the side wall portion 42a of the unpurified chamber side case 42.

The intake guide wall 46a is formed so that the angle θ with respect to the wall surface of the side wall 43a of the unpurified chamber case is an obtuse angle, and is curved so as to be concave toward the side wall 42a. Therefore, the intake air that flows into the unpurified chamber Ca from the outside air introduction pipe 47 is not reflected toward the outside air introduction pipe 47 by the intake guide wall 46a, but is smoothly guided toward the air cleaner element 44a.

Referring to Figures 8 and 10, the vertical width w1 of the intake guide wall 46a is set to be larger than the vertical width w2 of the air cleaner element 44a, and the intake air received by the intake guide wall 46a is prevented from flowing around to the back side of the intake guide wall 46a, and the intake air is urged in the direction of the air cleaner element 44a.

As shown in FIG. 9, the intake guide wall 46a has two mounting bosses 46c that protrude forward. As shown in FIG. 11, the upstream edge 46d has a protrusion 46f that protrudes toward the side wall 42a, which serves as the element-facing wall. When attaching the intake guide member 46 to the unpurified chamber side case 42, the mounting bosses 46c are abutted against the mounting protrusions 42g of the unpurified chamber side case 42 and fixed in place by screwing in the screws 48.

The embodiment of the present invention is configured as described above, and therefore has the following advantages:

The air cleaner device 40 according to an embodiment of the present invention comprises an air cleaner case 41 and an air cleaner element 44a that purifies the outside air introduced into the air cleaner case 41. The interior of the air cleaner case 41 is divided into an unpurified chamber Ca and a purified chamber Cb by a partition wall 44 including an air cleaner element 44a and an element holder 44b. The air cleaner case 41 comprises an unpurified chamber side case 42 and a purified chamber side case 43. The unpurified chamber side case 42 has an inlet 47a that introduces outside air, and the flow of the outside air introduced into the air cleaner case 41 is divided into an air cleaner case 44b and an air cleaner case 44c. It is equipped with an intake guide section 46 that guides the outside air toward the cleaner element 44a, and the unpurified room side case 42 has a side wall section 42a that serves as an element-facing wall surface that faces the air cleaner element 44a, and the intake guide section 46 has an intake guide wall 46a that guides the flow of outside air introduced into the air cleaner case 41 toward the air cleaner element 44a, the intake guide wall 46a is disposed so as to form an obtuse angle with the side wall section 42a, and the vertical width w1 of the intake guide wall 46a is greater than the vertical width w2 of the air cleaner element 44a.

According to the above configuration, the intake guide wall 46a of the intake guide member 46 is arranged to form an obtuse angle with the side wall portion 42a of the unpurified chamber side case 42, thereby preventing the intake flow from being reflected at the intake guide wall 46a and smoothly guiding the intake air to the air cleaner element 44a. In addition, by making the heightwise width w1 of the intake guide wall portion 46a larger than the heightwise width w2 of the air cleaner element 44a, the intake flow is prevented from flowing around to the back side of the intake guide wall portion 46a and the intake air is urged in the direction of the air cleaner element 44a, so that the air cleaner element 44a can be effectively utilized and intake efficiency can be improved.

Furthermore, since the intake guide member 46 is a separate member from the air cleaner case 41, it is easy to make the intake guide member 46 an appropriate size according to the size of the air cleaner element 44a to be disposed in the air cleaner case 41, and it is also easy to manufacture the intake guide wall portion 46a in an appropriate shape for guiding the intake air toward the air cleaner element 44a.

In addition, the side wall portion 42a of the unpurified chamber side case 42, which serves as the element-facing wall, has an intake flow perpendicular rib 42e that extends in a direction perpendicular to the intake flow, and the intake guide member 46 is arranged along the intake flow perpendicular rib 42e. Therefore, the intake flow that cannot be captured by the intake guide member 46 alone can be received by the intake flow perpendicular rib 42e and sent to the air cleaner element 44a side.

Furthermore, the side wall portion 42a has an intake flow direction rib 42f arranged along the intake flow, so that the intake flow can be guided by the intake flow direction rib 42f and the rigidity of the side wall portion 42a of the unpurified room side case 42 can be increased.

Furthermore, the intake guide member 46 is fixed to the side wall portion 42a by screws 48 along the intake flow perpendicular rib 42e, and the intake guide member 46 has a protrusion 46f that protrudes toward the side wall portion 42a on the upstream end edge 46d of the intake guide wall portion 46a in the intake flow direction.

With the above configuration, as shown in FIG. 11, when the intake guide member 46 is fixed with the screw 48, the protrusion 46f provided on the upstream end edge 46d of the intake guide wall portion 46a in the intake flow direction is pressed against the side wall portion 42a of the unpurified room side case 42, and the intake guide member 46 receives a reaction force from the side wall portion 42a, generating a moment centered on the point fixed by the screw 48, and the downstream end edge 46e on the downstream side of the intake flow direction of the intake guide member 46 is pressed against the intake flow perpendicular rib 42e, thereby reducing the gap between the intake guide member 46 and the intake flow perpendicular rib 42e, preventing the intake flow from turning around and improving intake efficiency.

Furthermore, with a motorcycle 1 equipped with such an air cleaner device 40, the intake air introduced into the unpurified chamber Ca from the inlet 47a of the outside air intake pipe 47 can be sent smoothly to the air cleaner element 44a without being reflected, improving intake efficiency, and a saddle-type vehicle equipped with an air cleaner device that makes effective use of the entire surface of the air cleaner element 44a can be provided.

As shown in FIG. 1, in the motorcycle 1 of this embodiment, the power unit P is supported at its upper part to be freely swingable on the main pipe 4 of the body frame F via the link member 12, but the power unit P may also be supported at its lower part to be freely swingable on the body frame F via the link member 12. On the other hand, from the viewpoint of ease of assembly of the power unit and compact arrangement of the catalytic converter and exhaust gas sensor, it is preferable that the power unit be supported at its upper part to be freely swingable on the body frame F.

The above describes an intake structure for an on-vehicle internal combustion engine according to one embodiment of the present invention, but the aspects of the present invention are not limited to the above embodiment and include various aspects that are within the scope of the gist of the present invention.

1...Motorcycle,
40...air cleaner device, 41...air cleaner case, 42...unpurified chamber side case, 42a...side wall portion, 42e...intake flow perpendicular rib, 42f...intake flow direction rib, 44a...air cleaner element, 46...intake guide member, 46a...intake guide wall portion, 46d...upstream edge, 46f...projection portion, 47a...inlet port, 48...screw,
Ca...unpurified room, Cb...purified room, w1...width, w2...width.

Claims (5)

an air cleaner case (41) and an air cleaner element (44a) that purifies outside air introduced into the air cleaner case (41);
The interior of the air cleaner case (41) is divided into an unpurified chamber (Ca) and a purified chamber (Cb) by a partition wall (44) including the air cleaner element (44a),
The air cleaner case (41) includes an unpurified room side case (42) and a purified room side case (43), and the unpurified room side case (42) has an inlet (47a) for introducing outside air.
an intake guide portion (46) that guides the flow of outside air introduced into the air cleaner case (41) toward the air cleaner element (44a);
The unpurified room side case (42) has an element facing wall surface (42a) facing the air cleaner element (44a),
The intake guide portion (46) has an intake guide wall (46a) that guides the flow of outside air introduced into the air cleaner case (41) toward the air cleaner element (44a),
The intake guide wall (46a) is disposed so as to form an obtuse angle with respect to the element facing wall surface (42a),
A vertical width (w1) of the intake guide wall (46a) is larger than a vertical width (w2) of the air cleaner element (44a),
The element-facing wall surface (42a) has an intake air flow-orthogonal rib (42e) extending in a direction perpendicular to the intake air flow,
The air cleaner device is characterized in that the intake guide portion (46) is disposed along the intake flow orthogonal rib (42e). The air cleaner device according to claim 1, characterized in that the intake guide portion (46) is an intake guide member (46) that is a separate member from the air cleaner case (41). The air cleaner device according to claim 1 or 2, characterized in that the element-facing wall surface (42a) has an intake flow direction rib (42f) arranged along the intake flow. the intake guide portion (46) is an intake guide member (46) that is a separate member from the air cleaner case (41),
The intake guide member (46) is fixed to the element-facing wall surface (42a) by a fixing member (48) along the intake air flow orthogonal rib (42e),
An air cleaner device as described in any one of claims 1 to 3, characterized in that the intake guide member (46) has a protrusion (46f) protruding toward the element opposing wall surface (42a) on an upstream edge (46d) of the intake guide wall (46a) in the intake air flow direction. A saddle-type vehicle having the air cleaner device (40) according to any one of claims 1 to 4.

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