WO2021200021A1 - Intake air purifying device - Google Patents

Abstract

Provided is an intake air purifying device in which a flow of intake air to a connection pipe is facilitated to improve intake efficiency.　This intake air purifying device comprises an air cleaner box 235 and a connection pipe 239, the inside of the air cleaner box 235 being divided into a dirty side 247D and a clean side 247C by an air cleaner element 237, the connection pipe 239 allowing intake air to flow therethrough from the clean side 247C toward an engine 211. In the intake air purifying device, a connection pipe upstream guide member 270 for guiding the intake air to a connection pipe inlet 239c at an upstream end 239a of the connection pipe 239 is provided within the clean side 247C. The connection pipe upstream guide member 270 includes a connection pipe upstream guide surface 271 having a concave curved surface and a guide opening 270a in the concave curved surface of the connection pipe upstream guide surface 271, and the guide opening 270a is larger than the connection pipe inlet 239c.

Description

Intake purification device

The present invention relates to an intake air purifying device.

Conventionally, there is known an intake air purifying device including an air cleaner box whose inside is divided into a dirty side and a clean side by an air cleaner element, and a connecting pipe through which intake air flowing from the clean side toward the engine side passes (for example). , Patent Document 1). In the saddle-riding type vehicle, the intake air purifying device has various shapes and arrangement locations depending on the type of the vehicle.

International Publication No. 2019/142279

By the way, in the intake air purifying device, it becomes difficult for the intake air to flow from the clean side to the engine side depending on the internal shape of the air cleaner box and the position of the upstream end portion of the connecting pipe. For example, when the intake air purification device is arranged in a saddle-riding vehicle, if the intake efficiency becomes low, the response of the engine is delayed, especially in the low speed range of the engine, and the drivability is impaired.
The present invention has been made in view of the above circumstances, and an object of the present invention is to facilitate the flow of intake air to a connecting pipe in an intake air purification device so that the intake efficiency can be improved.

This specification includes all the contents of the Japanese patent application and Japanese Patent Application No. 2020-064279 filed on March 31, 2020.
The intake air purifying device includes an air cleaner box (235,435) whose inside is divided into a dirty side (247D, 447D) and a clean side (247C, 447C) by an air cleaner element (237,437), and the clean side (235,435). In an air intake purification device including a connection pipe (239,439) through which intake air flowing from 247C, 447C) to the engine (211, 411) side passes, the intake air is connected to the clean side (247C, 447C). A connecting pipe upstream guide member (270,470) for guiding the connecting pipe inlet (239c, 439c) of the upstream end (239a, 439a) of the pipe (239,439) is provided, and the connecting pipe upstream guide member (270,470) is provided. (270,470) is a guide opening (270a, 270a,) which is an opening on the concave curved surface of the connecting pipe upstream side guide surface (271,471) and the connecting pipe upstream side guide surface (271,471). The guide opening (270a, 470a) is larger than the connecting pipe inlet (239c, 439c).

Further, in the above configuration, the guide surface (271) on the upstream side of the connecting pipe is a concave curved surface recessed on the opposite side to the element outlet surface (237b) which is the outlet of the intake air in the air cleaner element (237). You may.
Further, in the above configuration, at least a part of the tangent line (270d) located at the end portion (270c) on the element outlet surface side in the tangent line of the connection pipe upstream side guide surface (271) is the element outlet surface (237b). ) May be oriented.

Further, in the above configuration, the guide opening (270a) may be opened toward the element outlet surface (237b).
Further, in the above configuration, the guide opening (270a) may be arranged so as to be oriented along the element outlet surface (237b).

Further, in the above configuration, of the guide surface (271) on the upstream side of the connecting pipe with respect to the distance (L1) between the center (239d) of the connecting pipe inlet (239c) and the element outlet surface (237b). The distance (L2) between the portion (271a) farthest from the element element outlet surface (237b) and the element outlet surface (237b) may be larger.
Further, in the above configuration, when the upstream end (239a) of the connecting pipe (239) is viewed in the axial direction, the upstream guide surface (271) of the connecting pipe is the same as that of the connecting pipe (239). The diameter of the upstream guide surface (271) of the connecting pipe may be larger than that of the inner circumference of the upstream end (239a), and the connecting pipe (239) may be surrounded by the guide surface (271).

Further, in the above configuration, when viewed in the axial direction of the connecting pipe (239), at least a part of the guide surface (271) on the upstream side of the connecting pipe may overlap with the connecting pipe inlet (239c). ..
Further, in the above configuration, at least a part of the upstream side guide surface (271) of the connecting pipe may overlap the upstream end portion (239a) from the outer peripheral side in the axial direction of the connecting pipe (239). ..

Further, in the above configuration, the connecting pipe upstream side guide member (270) may have a plate shape.
Further, in the above configuration, the upstream side end portion (239a) may be arranged inside the concave curved surface of the connection pipe upstream side guide surface (271) with respect to the guide opening portion (270a).

The intake air purifier is equipped with an air cleaner box whose inside is divided into a dirty side and a clean side by an air cleaner element, and a connecting pipe through which the intake air flowing from the clean side to the engine side passes. A guide member on the upstream side of the connecting pipe that guides the intake air to the inlet of the connecting pipe at the upstream end of the connecting pipe is provided. It is provided with a guide opening which is an opening on a concave curved surface of the guide surface, and the guide opening is larger than the connecting pipe inlet.
According to this configuration, the intake air on the clean side enters the guide member on the upstream side of the connecting pipe through a guide opening larger than the inlet of the connecting pipe of the connecting pipe, and is guided and connected to the guide surface on the upstream side of the connecting pipe having a concave curved surface. Pipe connection Flows to the pipe inlet. Therefore, the guide member on the upstream side of the connecting pipe can easily suck the intake air into the connecting pipe, and the intake efficiency can be improved.

Further, in the above configuration, the guide surface on the upstream side of the connecting pipe may be a concave curved surface recessed on the opposite side to the element outlet surface which is the outlet of the intake air in the air cleaner element.
According to this configuration, the intake air flowing from the element outlet surface of the air cleaner element can be efficiently flowed to the connection pipe inlet by the connection pipe upstream guide surface.
Further, in the above configuration, at least a part of the tangent line located at the end of the element outlet surface side in the tangent line of the guide surface on the upstream side of the connecting pipe may be directed to the element outlet surface.
According to this configuration, the intake air flowing from the element outlet surface to the connection pipe side can be smoothly taken into the guide member on the upstream side of the connection pipe from the guide opening, and the intake efficiency can be improved.

Further, in the above configuration, the guide opening may be opened toward the element outlet surface.
According to this configuration, the intake air flowing from the element outlet surface to the connection pipe side can be smoothly taken into the guide member on the upstream side of the connection pipe from the guide opening, and the intake efficiency can be improved.
Further, in the above configuration, the guide opening may be arranged so as to be oriented along the element outlet surface.
According to this configuration, the intake air can be efficiently taken into the guide member on the upstream side of the connecting pipe from the guide opening.

Further, in the above configuration, with respect to the distance between the center of the connecting pipe inlet and the element outlet surface, the distance between the part of the guide surface on the upstream side of the connecting pipe that is farthest from the element element outlet surface and the element outlet surface. It may be larger.
According to this configuration, the intake air can be guided by the guide surface on the upstream side of the connecting pipe over a wide range, and the intake air can be efficiently flowed to the inlet of the connecting pipe.
Further, in the above configuration, when viewed in the axial direction of the connecting pipe, the guide surface on the upstream side of the connecting pipe has a larger diameter than the inner circumference of the upstream end of the connecting pipe, and the guide surface on the upstream side of the connecting pipe. May surround the connecting pipe from the surroundings.
According to this configuration, the guide surface on the upstream side of the connecting pipe, which has a larger diameter than the inner circumference of the upstream end of the connecting pipe, surrounds the connecting pipe from the surroundings. It can be flushed well.

Further, in the above configuration, when the upstream end of the connecting pipe is viewed in the axial direction, at least a part of the guide surface on the upstream side of the connecting pipe may overlap the inlet of the connecting pipe.
According to this configuration, the intake air can be guided by the guide surface on the upstream side of the connecting pipe over a wide range, and the intake air can be efficiently flowed to the inlet of the connecting pipe.
Further, in the above configuration, at least a part of the guide surface on the upstream side of the connecting pipe may overlap the upstream end portion from the outer peripheral side in the axial direction of the connecting pipe.
According to this configuration, the intake air can be continuously flowed from the guide surface on the upstream side of the connecting pipe to the upstream end portion, and the intake air can be efficiently flowed to the inlet of the connecting pipe.

Further, in the above configuration, the guide member on the upstream side of the connecting pipe may have a plate shape.
According to this configuration, the volume occupied by the guide member on the upstream side of the connecting pipe can be reduced, and the volume on the clean side can be secured.
Further, in the above configuration, the upstream side end portion may be arranged inside the concave curved surface of the connecting pipe upstream side guide surface with respect to the guide opening.
According to this configuration, the intake air can be continuously flowed from the guide surface on the upstream side of the connecting pipe to the upstream end portion, and the intake air can be efficiently flowed to the inlet of the connecting pipe.

FIG. 1 is a left side view of a motorcycle. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a side view of the guide member on the upstream side of the connecting pipe as viewed from the air cleaner element side. FIG. 7 is a cross-sectional view of the motorcycle according to the second embodiment. FIG. 8 is a perspective view of the intake duct and the peripheral portion of the intake duct upstream side guide member as viewed from above with the seat removed. FIG. 9 is a left side view of the motorcycle according to the third embodiment. FIG. 10 is a cross-sectional view taken along the line XX of FIG. FIG. 11 is a left side view of the motorcycle according to the fourth embodiment. FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the explanation, the directions such as front / rear / left / right and up / down are the same as the directions with respect to the vehicle body unless otherwise specified. Further, the reference numeral FR shown in each figure indicates the front of the vehicle body, the reference numeral UP indicates the upper portion of the vehicle body, and the reference numeral LH indicates the left side of the vehicle body.

[First Embodiment]
Hereinafter, the first embodiment to which the present invention is applied will be described with reference to FIGS. 1 to 6.

FIG. 1 is a left side view of the motorcycle 201 according to the second embodiment.
In the motorcycle 201, the body frame 210 supports the engine 211 as a power unit, and the front fork 212 that steerably supports the front wheels 202 is steerably supported by the front end of the body frame 210, and the swing arm that supports the rear wheels 203. Reference numeral 213 is a vehicle provided on the rear side of the vehicle body frame 210.
The motorcycle 201 is a saddle-riding vehicle in which an occupant sits so as to straddle the seat 214, and the seat 214 is provided above the rear portion of the vehicle body frame 210.
The motorcycle 201 includes a pair of left and right side covers 215 that cover the vehicle body such as the vehicle body frame 210.

The body frame 210 includes a head pipe 217 provided at the front end of the body frame 210, one main frame 218 extending rearward and downward from the head pipe 217, and a pivot frame 219 extending downward from the rear end of the main frame 218. ..

The engine 211 includes a crankcase 221 that supports a crankshaft 220 that extends in the vehicle width direction, and a cylinder portion 222 that extends from the front surface of the crankcase 221 to the front of the vehicle.
The cylinder portion 222 includes a cylinder 222a that accommodates a piston (not shown) that reciprocates back and forth, a cylinder head 222b that is connected to the front surface of the cylinder 222a, and a head cover 222c that covers the front surface of the cylinder head 222b.
The engine 211 is a horizontal engine in which the axis 222d of the cylinder 222a extends substantially horizontally in the vehicle front-rear direction when viewed from the side of the vehicle.

The engine 211 is supported by the body frame 210 and is arranged in front of the pivot frame 219 and below the main frame 218. The cylinder portion 222 extends forward and backward below the main frame 218.
The intake device 225 that supplies intake air to the engine 211 is arranged above the cylinder portion 222.
The exhaust pipe 226 of the engine 211 extends rearward from the lower surface of the cylinder head 222b.

The steering handle 227 is provided at the upper end of the front fork 212.
The front wheel 202 is supported by the lower end of the front fork 212. The front fender 228 is attached to the front fork 212.

The swing arm 213 is supported by the vehicle body frame 210 via a pivot shaft 213a inserted through the front end portion. The rear wheel 203 is supported by the rear end portion of the swing arm 213.
A rear suspension 229 is hung between the rear part of the swing arm 213 and the rear part of the vehicle body.
The fuel tank 223 is provided above the main frame 218 between the head pipe 217 and the seat 214.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
With reference to FIGS. 2 and 3, the intake device 225 is a tubular insulator 232 that connects the intake purification device 230, the throttle body 231 that adjusts the flow rate of intake air, and the throttle body 231 to the intake port on the upper surface of the cylinder head 222b. And.

The intake air purifying device 230 includes an air cleaner box 235, a partition 236 that partitions the inside of the air cleaner box 235, an air cleaner element 237 provided in the partition 236, an intake duct 238 that takes in air into the air cleaner box 235, and an air cleaner box. A connecting pipe 239 for connecting the 235 to the throttle body 231 is provided.
Further, the intake purification device 230 includes an intake duct upstream guide member 240 that guides the intake air to the intake duct 238 on the upstream side of the intake duct 238, and an intake duct that guides the intake air to the air cleaner element 237 on the downstream side of the intake duct 238. A downstream guide member 265 and a connecting pipe upstream guide member 270 that guides intake air to the connecting pipe 239 on the upstream side of the connecting pipe 239 are provided.
The intake air purifying device 230 is covered from the outside by the left and right side covers 215.

The air cleaner box 235 is arranged below the main frame 218 and above the cylinder portion 222, and is located between the main frame 218 and the cylinder portion 222. The air cleaner box 235 is a box-shaped member that extends in the vehicle width direction across the main frame 218 located at the center of the vehicle width from side to side.

The air cleaner box 235 includes a box-shaped air cleaner case 245 in which one of the left and right side surfaces (left side surface) opens outward in the vehicle width direction, and a case cover 246 that closes the open portion of the side surface of the air cleaner case 245. .. The case cover 246 is coupled to the peripheral edge portion 245a of the open portion of the air cleaner case 245.

The partition wall 236 is a plate-shaped member arranged so that the plate thickness direction is directed in the vehicle width direction, and partitions the inside of the air cleaner box 235 in the vehicle width direction.
The partition wall 236 divides the inside of the air cleaner box 235 into a dirty side 247D on the upstream side of the air cleaner element 237 and a clean side 247C on the downstream side of the air cleaner element 237.
The partition wall 236 is sandwiched between the mating surfaces of the air cleaner case 245 and the case cover 246.

The air cleaner element 237 is a filter that collects dust contained in the intake air. The air cleaner element 237 is a plate-shaped member arranged so that the plate thickness direction is directed in the vehicle width direction, and is supported by the partition wall 236. The air cleaner element 237 is substantially rectangular when viewed from the side of the vehicle.
The air cleaner element 237 and the partition wall 236 are arranged closer to one of the left and right sides (left side) in the air cleaner box 235 so that the clean side 247C has a larger capacity than the dirty side 247D.

The dirty side 247D is a room through which the intake air flows before passing through the air cleaner element 237, and is formed between the case cover 246 and the partition wall 236.
The clean side 247C is a room through which the intake air after being purified through the air cleaner element 237 flows, and is formed between the partition wall 236 and the air cleaner case 245.
The dirty side 247D and the clean side 247C are arranged side by side in the vehicle width direction.

The air cleaner element 237 includes an element inlet surface 237a exposed to the dirty side 247D and an element outlet surface 237b which is a surface opposite to the element inlet surface 237a and is exposed to the clean side 247C. The element inlet surface 237a and the element outlet surface 237b are flat surfaces and are substantially parallel to each other.
The intake air flows into the air cleaner element 237 from the element inlet surface 237a of the dirty side 247D, and flows from the element outlet surface 237b to the clean side 247C.

The intake duct 238 extends from the rear surface portion of the case cover 246 to the rear outside the air cleaner box 235, and communicates the dirty side 247D with the space outside the air cleaner box 235.
The intake duct 238 is a pipe having a substantially circular cross section and extends in the vehicle front-rear direction within the dirty side 247D. The intake duct 238 is arranged in the dirty side 247D on the outside in the vehicle width direction with respect to the element inlet surface 237a, and extends in the vehicle front-rear direction substantially parallel to the element inlet surface 237a along the element inlet surface 237a.

The rear end of the intake duct 238 is the upstream end 238a of the intake duct 238 in the flow of intake air. The intake duct 238 takes in outside air as intake air from the duct inlet 238b on the rear end surface of the upstream end portion 238a.
The front end of the intake duct 238 is the downstream end 238c of the intake duct 238 in the flow of intake air. The duct outlet 238d on the front end surface of the downstream end portion 238c opens toward the front of the vehicle.
The duct outlet 238d is located at a position overlapping the element inlet surface 237a from the outside in the vehicle width direction when viewed from the vehicle side.

The connection pipe 239 penetrates the rear surface 245b of the air cleaner case 245 from the inside of the clean side 247C and extends to the outside of the air cleaner box 235. The connecting pipe 239 extending outward from the air cleaner box 235 extends downward and inward in the vehicle width direction, and is connected to the throttle body 231 below the air cleaner box 235.

The front end of the connecting pipe 239 is the upstream end 239a of the connecting pipe 239 in the flow of intake air. The upstream end portion 239a extends in the vehicle front-rear direction within the clean side 247C. The axis 239b of the connecting pipe 239 extends in the vehicle front-rear direction within the clean side 247C.
The intake air in the clean side 247C flows into the connecting pipe 239 from the connecting pipe inlet 239c on the front end surface of the upstream end portion 239a. The connecting pipe inlet 239c faces the front surface 245c of the air cleaner case 245 substantially from the rear.

The upstream end portion 239a is provided in the clean side 247C on the side opposite to the element outlet surface 237b in the vehicle width direction. The air cleaner element 237 is located on the left and right sides of the main frame 218, and the connecting pipe 239 is located on the left and right sides of the main frame 218.

The intake duct upstream side guide member 240 is arranged upstream of the upstream side end portion 238a of the intake duct 238 and behind the upstream side end portion 238a in the flow of intake air. The intake duct upstream side guide member 240 and the intake duct 238 are covered from the outside by the side cover 215.
The intake duct upstream side guide member 240 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spherical body in substantially half.
The cup-shaped inner surface of the intake duct upstream side guide member 240 is a concave curved duct upstream side guide surface 252. The guide inlet opening 253, which is an opening on the concave curved surface of the duct upstream guide surface 252, exposes the duct upstream guide surface 252 to the outside in the cup shape of the intake duct upstream guide member 240.

The peripheral edge portion 252a of the duct upstream side guide surface 252 that partitions the guide entrance opening 253 is substantially circular. The guide entrance opening 253 is substantially circular.
The apex 252b of the concave curved surface of the duct upstream side guide surface 252 is located at the bottom of the inner surface of the intake duct upstream side guide member 240 in the cup shape. The inner diameter of the guide surface 252 on the upstream side of the duct increases from the apex 252b toward the guide inlet opening 253 side.

The guide member 240 on the upstream side of the intake duct is arranged upright so that the guide inlet opening 253 faces the front of the vehicle.
The guide member 240 on the upstream side of the intake duct is arranged so that the guide inlet opening 253 faces the duct inlet 238b of the upstream end portion 238a of the intake duct 238. The guide entrance opening 253 opens toward the front side of the vehicle.
The inner diameter of the guide inlet opening 253 of the intake duct upstream side guide member 240 is larger than the inner diameter of the duct inlet 238b of the intake duct 238 and the outer diameter of the upstream end portion 238a.

In the intake duct 238, the entire duct inlet 238b is located inside the concave curved surface of the duct upstream side guide surface 252, and the duct inlet 238b opens inside the duct upstream side guide surface 252. That is, the duct inlet 238b is located on the rear side of the guide inlet opening 253 and on the bottom side of the cup shape.
A distance is provided in the axial direction of the intake duct 238 between the cup-shaped bottom of the duct upstream guide surface 252 and the duct inlet 238b.

With reference to FIG. 3, the axis 238e of the intake duct 238 extends in the front-rear direction of the vehicle. When viewed in the axial direction of the intake duct 238, the duct inlet 238b of the intake duct 238 overlaps the apex 252b of the duct upstream guide surface 252.

The duct upstream side guide surface 252 covers the upstream side end portion 238a of the intake duct 238 located inside the concave curved surface of the duct upstream side guide surface 252 from the periphery and the rear side of the upstream side end portion 238a. That is, the guide inlet opening 253 of the duct upstream guide surface 252 overlaps the upstream end 238a in the axial direction of the axis 238e at the upstream end 238a from the outer peripheral side. The upstream end portion 238a and the duct upstream guide surface 252 are continuous in the intake flow direction of the intake duct 238.
Here, the axial direction of the axis 238e is the flow direction of the intake air of the intake duct 238.

The intake duct downstream side guide member 265 is arranged in the dirty side 247D, downstream of the downstream end portion 238c of the intake duct 238, and in front of the downstream end portion 238c.
The intake duct downstream guide member 265 has a cup shape in which a hollow spherical body is cut at the outlet opening surface 265a to form a hemispherical shape, and the cup shape is further cut at the inlet opening surface 265b substantially orthogonal to the outlet opening surface 265a. It is a cup-shaped member of.

The intake duct downstream side guide member 265 is arranged so that the outlet opening surface 265a, which is the cup-shaped opening surface, faces the element inlet surface 237a side. When viewed from the side of the vehicle, the exit opening surface 265a overlaps the element inlet surface 237a.
Further, the downstream end 238c of the intake duct 238 is inserted into the inlet opening surface 265b of the intake duct downstream guide member 265 from the rear, and at least a part of the duct outlet 238d is opened in the intake duct downstream guide member 265. do.

The cup-shaped inner surface of the intake duct downstream side guide member 265 is a guide surface 265c that guides the intake air toward the element inlet surface 237a. The guide surface 265c is a concave curved surface in which the inner surface of the cup shape is recessed on the opposite side of the element inlet surface 237a with reference to the outlet opening surface 265a. The guide surface 265c is inclined so as to approach the element inlet surface 237a as the distance from the duct outlet 238d increases in the direction in which the intake air is discharged from the duct outlet 238d.

FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a sectional view taken along line VV of FIG. FIG. 6 is a side view of the connecting pipe upstream side guide member 270 as viewed from the air cleaner element 237 side.
With reference to FIGS. 2 and 4 to 6, the connecting pipe upstream guide member 270 is located upstream of the upstream end 239a of the connecting pipe 239 in the clean side 247C and in front of the upstream end 239a. Be placed.

The guide member 270 on the upstream side of the connecting pipe has a cup shape in which a hollow spherical body is cut at the guide opening 270a to form a hemisphere, and the cup shape is further cut at the outlet opening 270b substantially orthogonal to the guide opening 270a. It is a cup-shaped member of. The connecting pipe upstream side guide member 270 has a shape obtained by bending a flat plate member into a cup shape, and the connecting pipe upstream side guide member 270 has a plate shape.
The guide member 270 on the upstream side of the connecting pipe is arranged so that the guide opening 270a, which is a cup-shaped opening surface, faces the element outlet surface 237b side.

The cup-shaped inner surface of the connecting pipe upstream side guide member 270 is the connecting pipe upstream side guide surface 271 that guides the intake air toward the connecting pipe inlet 239c of the connecting pipe 239. The guide surface 271 on the upstream side of the connecting pipe is a concave curved surface in which the inner surface of the cup shape is recessed on the opposite side of the element outlet surface 237b with reference to the guide opening 270a.
The guide opening 270a exposes the guide surface 271 on the upstream side of the connecting pipe to the element outlet surface 237b side.

The outlet opening 270b is an opening surface formed so as to cut out a part of the side surface of the cup shape.
The outlet opening 270b is provided at the rear portion of the connecting pipe upstream side guide member 270 in the top view of FIG. 4, and opens rearward.

The guide member 270 on the upstream side of the connecting pipe is arranged so that the guide opening 270a is separated from the element outlet surface 237b by a predetermined distance in the vehicle width direction. Further, the guide opening 270a is arranged along the element outlet surface 237b, and the guide opening 270a and the element outlet surface 237b are substantially parallel to each other.
The concave bottom 271a of the guide surface 271 on the upstream side of the connecting pipe when the guide opening 270a is used as a reference is on the opposite side of the guide opening 270a from the element outlet surface 237b. The bottom portion 271a is a portion of the connecting pipe upstream side guide surface 271 located at the position farthest from the element outlet surface 237b. The inner diameter of the guide surface 271 on the upstream side of the connecting pipe increases from the bottom 271a toward the guide opening 270a.
The bottom portion 271a is located on the cup-shaped bottom surface of the connecting pipe upstream side guide member 270, and the guide opening 270a faces the bottom surface.

With reference to FIG. 4, in the tangent line of the connecting pipe upstream side guide surface 271 of the connecting pipe upstream side guide member 270, the tangent line 270d located at the end portion 270c partitioning the guide opening 270a is directed toward the element outlet surface 237b. It intersects the element exit surface 237b. The tangent line 270d intersects the element outlet surface 237b as long as it is located on the end 270c, regardless of where it is located on the end 270c. That is, the tangent line 270d intersects the element outlet surface 237b over the entire circumference of the end portion 270c. As for the tangent line 270d, at least a part of the tangent line 270d located at the end portion 270c may be directed to the element outlet surface 237b.

Further, when the guide member 270 on the upstream side of the connecting pipe is viewed in the direction orthogonal to the element outlet surface 237b, the guide opening 270a overlaps the element outlet surface 237b. In the second embodiment, the entire guide opening 270a overlaps the element outlet surface 237b, but at least a part of the guide opening 270a may overlap the element outlet surface 237b.

The rear portion of the connecting pipe upstream side guide member 270 is arranged outside in the vehicle width direction with respect to the upstream side end portion 239a of the connecting pipe 239, and covers the upstream side end portion 239a from the side opposite to the element outlet surface 237b.
The upstream end 239a of the connecting pipe 239 enters the inside of the connecting pipe upstream guide surface 271 from the outlet opening 270b, and the connecting pipe inlet 239c of the upstream end 239a is inside the connecting pipe upstream guide surface 271. Open toward the front.
At least a part of the connecting pipe inlet 239c is arranged inside the connecting pipe upstream side guide surface 271 with respect to the guide opening 270a. Further, the connecting pipe inlet 239c is located in the upper and lower intermediate portions in the connecting pipe upstream side guide surface 271.

The rear portion of the connecting pipe upstream side guide surface 271 overlaps from the outer peripheral side of the upstream side end portion 239a in the axial direction of the connecting pipe 239, and covers the upstream side end portion 239a from the periphery.
That is, the guide surface 271 on the upstream side of the connecting pipe and the upstream end portion 239a of the connecting pipe 239 are continuous in the axial direction of the connecting pipe 239.

Further, referring to FIG. 4, the concave bottom 271a and the element outlet surface of the connecting pipe upstream side guide surface 271 with respect to the distance L1 between the center 239d of the connecting pipe inlet 239c of the connecting pipe 239 and the element outlet surface 237b. The distance L2 from 237b is larger. That is, the guide surface 271 on the upstream side of the connecting pipe is arranged offset with respect to the connecting pipe inlet 239c of the connecting pipe 239 on the side opposite to the element outlet surface 237b.

The front portion 271b of the guide surface 271 on the upstream side of the connecting pipe is curved so as to approach the element outlet surface 237b side toward the front side in the top view of FIG.
When the connecting pipe inlet 239c is viewed in the axial direction of the connecting pipe 239, the front portion 271b of the connecting pipe upstream side guide surface 271 overlaps the connecting pipe inlet 239c from the front, and at least a part of the connecting pipe inlet 239c is on the upstream side. Cover from.

When viewed in the axial direction of the connecting pipe 239, the inner diameter of the guide surface 271 on the upstream side of the connecting pipe is larger than the diameter of the inner circumference of the connecting pipe inlet 239c of the connecting pipe 239, that is, the inner diameter of the connecting pipe inlet 239c.
The upstream side end portion 239a is surrounded from above, outside in the vehicle width direction, and below by a connecting pipe upstream side guide surface 271 having a diameter larger than that of the upstream side end portion 239a.
Further, the connecting pipe upstream side guide member 270 is a component manufactured in a process different from that of the connecting pipe 239. Therefore, the connecting pipe 239 can be made into a simple shape, and the connecting pipe upstream side guide member 270 can be easily formed to have a diameter larger than that of the connecting pipe 239.

The connecting pipe upstream side guide member 270 includes a fixing hole portion 272 that penetrates the connecting pipe upstream side guide surface 271 in the vehicle width direction. The fixing hole portion 272 is provided in the vicinity of the bottom portion 271a.
Of the side walls of the air cleaner case 245, the side wall 245d located outside the connecting pipe 239 in the vehicle width direction includes an engaging portion 273 protruding into the clean side 247C.
The guide member 270 on the upstream side of the connecting pipe is fixed to the air cleaner case 245 by engaging the engaging portion 273 with the fixing hole portion 272.
Further, the connecting pipe upstream side guide member 270 includes a flange portion 274 extending downward from the outer circumference of the connecting pipe upstream side guide surface 271 and engages with the air cleaner case 245 via the flange portion 274.

Here, the flow of the intake air of the intake device 225 will be described.
With reference to FIGS. 2 and 3, the outside air flows as the intake air W from the guide inlet opening 253 on the front surface of the intake duct upstream side guide member 240 to the inside of the concave curved surface of the duct upstream side guide surface 252. The intake W flows from the guide inlet opening 253 side to the apex 252b side along the duct upstream side guide surface 252, then turns back to the front side in the vicinity of the apex 252b, and the duct inlet of the upstream end 238a of the intake duct 238. It flows into 238b.
Here, since the guide entrance opening 253 of the intake duct upstream side guide member 240 opens in front of the vehicle, the traveling wind when the motorcycle 201 travels forward directly flows into the guide entrance opening 253. Therefore, the traveling wind can be efficiently taken into the duct upstream side guide surface 252 from the guide inlet opening 253 as the intake air W.
Further, since the inner diameter of the guide inlet opening 253 of the intake duct upstream side guide member 240 is larger than the inner diameter of the duct inlet 238b of the intake duct 238, the intake W is collected by the intake duct upstream side guide member 240, and the collected intake air is collected. W can be supplied to the duct inlet 238b, and the intake air W can be efficiently flowed to the intake duct 238.

Further, the duct inlet 238b of the intake duct 238 is located inside the concave curved surface of the duct upstream side guide surface 252, and the duct inlet 238b and the duct upstream side guide surface 252 are continuous in the axial direction of the intake duct 238. .. Therefore, the intake air W guided by the duct upstream side guide surface 252 can be efficiently flowed to the duct inlet 238b.
Further, when viewed in the axial direction of the intake duct 238, the duct inlet 238b of the intake duct 238 overlaps the apex 252b of the guide surface 252 on the upstream side of the duct. It can be flushed to 238b.

The intake W that has flowed into the intake duct 238 from the duct inlet 238b flows into the dirty side 247D from the duct outlet 238d at the front end of the intake duct 238.
Specifically, the intake W flowing into the dirty side 247D from the duct outlet 238d flows along the curved surface of the guide surface 265c of the intake duct downstream side guide member 265 and turns to the element inlet surface 237a side inside in the vehicle width direction. , Flows from the outlet opening surface 265a toward the element inlet surface 237a. Therefore, the intake air W can be efficiently supplied from the intake duct 238 to the air cleaner element 237.

With reference to FIGS. 2 to 5, the intake air W flowing into the air cleaner element 237 from the element inlet surface 237a flows into the clean side 247C from the element outlet surface 237b, and is guided by the connecting pipe upstream side guide member 270 to the connecting pipe. It flows to 239.
Specifically, the intake W of the clean side 247C flows into the guide surface 271 on the upstream side of the connecting pipe from the guide opening 270a, flows backward along the curved surface of the guide surface 271 on the upstream side of the connecting pipe, and ends on the upstream side. It flows into the connecting pipe 239 from the connecting pipe inlet 239c of 239a.
The intake W of the connecting pipe 239 flows through the throttle body 231 and the insulator 232 to the intake port on the upper surface of the cylinder head 222b.
Here, since the inner diameter of the guide opening 270a of the connecting pipe upstream side guide member 270 is larger than the inner diameter of the connecting pipe inlet 239c of the connecting pipe 239, the intake air W is collected by the connecting pipe upstream side guide surface 271 and gathered. The intake W can be supplied to the connecting pipe inlet 239c, and the intake W can be efficiently flowed to the connecting pipe 239.

Further, the connecting pipe inlet 239c of the connecting pipe 239 is located inside the concave curved surface of the connecting pipe upstream side guide surface 271, and the connecting pipe upstream side guide surface 271 and the connecting pipe inlet 239c are in the axial direction of the connecting pipe 239. It is continuous. Therefore, the intake air W guided by the guide surface 271 on the upstream side of the connecting pipe can be efficiently flowed to the connecting pipe inlet 239c.

As described above, according to the first embodiment to which the present invention is applied, the intake air purifying device 230 has an air cleaner box 235 whose inside is divided into a dirty side 247D and a clean side 247C by an air cleaner element 237. And a connection pipe 239 through which the intake air flowing from the clean side 247C toward the engine 211 side passes, and a connection that guides the intake air to the connection pipe inlet 239c of the upstream end portion 239a of the connection pipe 239 in the clean side 247C. The pipe upstream side guide member 270 is provided, and the connecting pipe upstream side guide member 270 is a guide opening which is an opening in the concave curved surface of the connecting pipe upstream side guide surface 271 and the connecting pipe upstream side guide surface 271. With 270a, the guide opening 270a is larger than the connecting pipe inlet 239c.
According to this configuration, the intake air of the clean side 247C enters the connecting pipe upstream side guide member 270 from the guide opening 270a larger than the connecting pipe inlet 239c of the connecting pipe 239, and enters the concave curved connecting pipe upstream side guide surface. Guided by 271, it flows to the connection pipe inlet 239c of the connection pipe 239. Therefore, the guide member 270 on the upstream side of the connecting pipe can easily suck the intake air into the connecting pipe 239, and the intake efficiency can be improved.

Further, the guide surface 271 on the upstream side of the connecting pipe is a concave curved surface recessed on the opposite side to the element outlet surface 237b, which is the outlet surface of the intake air in the air cleaner element 237, and has a concave shape of the guide surface 271 on the upstream side of the connecting pipe. The bottom portion 271a is located on the side opposite to the element outlet surface 237b with respect to the guide opening 270a.
According to this configuration, the intake air flowing from the element outlet surface 237b of the air cleaner element 237 can be efficiently flowed to the connection pipe inlet 239c by the connection pipe upstream guide surface 271.
Further, at least a part of the tangent line 270d located at the end portion 270c on the element outlet surface 237b side in the tangent line of the guide surface 271 on the upstream side of the connecting pipe is directed to the element outlet surface 237b.
According to this configuration, the intake air flowing from the element outlet surface 237b to the connection pipe 239 side can be smoothly taken into the connection pipe upstream side guide member 270 from the guide opening 270a, and the intake efficiency can be improved.

Further, the guide opening 270a opens toward the element outlet surface 237b.
According to this configuration, the intake air flowing from the element outlet surface 237b to the connection pipe 239 side can be smoothly taken into the connection pipe upstream side guide member 270 from the guide opening 270a, and the intake efficiency can be improved.
Further, the guide opening 270a is arranged in a direction along the element outlet surface 237b.
According to this configuration, the intake air can be efficiently taken into the guide member 270 on the upstream side of the connecting pipe from the guide opening 270a.

Further, with respect to the distance L1 between the center 239d of the connecting pipe inlet 239c and the element outlet surface 237b, the bottom portion 271a and the element outlet surface 237b, which are the parts of the connecting pipe upstream side guide surface 271 farthest from the element outlet surface 237b, The distance L2 between them is larger.
According to this configuration, the intake air can be guided by the guide surface 271 on the upstream side of the connecting pipe over a wide range, and the intake air can be efficiently flowed to the connecting pipe inlet 239c.
Further, when the upstream end 239a of the connecting pipe 239 is viewed in the axial direction, the guide surface 271 on the upstream side of the connecting pipe has a larger diameter than the inner circumference of the upstream end 239a of the connecting pipe 239 and is connected. The guide surface 271 on the upstream side of the pipe surrounds the connecting pipe 239 from the periphery.
According to this configuration, the connecting pipe upstream guide surface 271 having a diameter larger than the inner circumference of the upstream end 239a of the connecting pipe 239 surrounds the connecting pipe 239 from the surroundings, so that the intake is taken by the connecting pipe upstream guide surface 271. It can be efficiently flowed to the connecting pipe inlet 239c.

Further, when viewed in the axial direction of the connecting pipe 239, at least a part of the guide surface 271 on the upstream side of the connecting pipe overlaps with the connecting pipe inlet 239c.
According to this configuration, the intake air can be guided by the guide surface 271 on the upstream side of the connecting pipe over a wide range, and the intake air can be efficiently flowed to the connecting pipe inlet 239c.
Further, at least a part of the guide surface 271 on the upstream side of the connecting pipe overlaps the upstream end portion 239a from the outer peripheral side in the axial direction of the connecting pipe 239.
According to this configuration, the intake air can be continuously flowed from the upstream side guide surface 271 of the connecting pipe to the upstream end portion 239a, and the intake air can be efficiently flowed to the connecting pipe inlet 239c.

Further, the guide member 270 on the upstream side of the connecting pipe has a plate shape.
According to this configuration, the volume occupied by the guide member 270 on the upstream side of the connecting pipe can be reduced, and the volume of the clean side 247C can be secured.
Further, the upstream end portion 239a is arranged inside the concave curved surface of the connecting pipe upstream guide surface 271 with respect to the guide opening 270a.
According to this configuration, the intake air can be continuously flowed from the upstream side guide surface 271 of the connecting pipe to the upstream end portion 239a, and the intake air can be efficiently flowed to the connecting pipe inlet 239c.

Further, according to the first embodiment to which the present invention is applied, the intake air purifying device 230 has an air cleaner box 235 whose inside is divided into a dirty side 247D and a clean side 247C by an air cleaner element 237, and a dirty side. The 247D is provided with an intake duct 238 that introduces outside air as intake air, and an intake air that guides the intake air to the duct inlet 238b of the upstream end portion 238a of the intake duct 238 on the upstream side of the intake duct 238 outside the air cleaner box 235. The duct upstream side guide member 240 is provided, and the intake duct upstream side guide member 240 has a concave curved duct upstream side guide surface 252 and a guide inlet opening 253 which is an opening on the concave curved surface of the duct upstream side guide surface 252. The guide inlet opening 253 is larger than the duct inlet 238b.
According to this configuration, the intake air enters the intake duct upstream side guide member 240 through the guide inlet opening 253 larger than the duct inlet 238b of the intake duct 238, and is guided by the concave curved duct upstream side guide surface 252. It flows to the duct inlet 238b of the intake duct 238. Therefore, the intake duct upstream side guide member 240 makes it easy to suck the intake air into the intake duct 238, and the intake efficiency can be improved.

Further, the guide inlet opening 253 opens in a direction facing the duct inlet 238b.
According to this configuration, since the guide inlet opening 253 opens in the direction facing the duct inlet 238b, the intake air flowing from the guide inlet opening 253 to the duct upstream side guide surface 252 having a concave curved surface is efficiently fed to the duct inlet 238b. Can be flushed to.
Further, the intake air purifying device 230 is mounted on the motorcycle 201, and the guide entrance opening 253 opens toward the front of the vehicle.
According to this configuration, the running wind of the motorcycle 201 running forward can be efficiently taken into the guide surface 252 on the upstream side of the duct from the guide entrance opening 253 that opens toward the front of the vehicle, and the intake air is taken into the intake duct 238. It can be flowed efficiently.

Further, the guide inlet opening 253 overlaps the upstream end 238a of the intake duct 238 in the axial direction of the axis 238e of the upstream end 238a of the intake duct 238.
According to this configuration, since the guide inlet opening 253 overlaps the upstream end portion 238a of the intake duct 238, the flow of intake air around the upstream end portion 238a can be stabilized and the intake efficiency can be improved.

[Second Embodiment]
Hereinafter, a second embodiment to which the present invention is applied will be described with reference to FIGS. 7 to 8.
The second embodiment describes the motorcycle 401 different from the motorcycle 201 of the first embodiment.

FIG. 7 is a cross-sectional view of the motorcycle 401 according to the second embodiment.
In the motorcycle 401, the engine 411 is supported by the body frame 410, and the front fork (not shown) that steerably supports the front wheels (not shown) is steerably supported by the front end of the body frame 410 to support the rear wheels 403. A swing arm (not shown) is provided on the rear side of the vehicle body frame 410.
The motorcycle 401 is a saddle-riding vehicle in which the occupant sits on the seat 414.

The vehicle body frame 410 is provided with a pair of left and right seat frames 418 extending front and rear to support the seat 414 from below, behind the engine 411.
The fuel tank 423 is provided above the engine 411 and in front of the seat 414.

The engine 411 includes a crankcase 421 and a cylinder portion 422 extending upward from the upper surface of the front portion of the crankcase 421.
The intake device 425 that supplies intake air to the cylinder portion 422 is arranged behind the cylinder portion 422 and below the seat 414.
The motorcycle 401 includes a rear fender 444 that covers the space between the left and right seat frames 418 from below.

The intake device 425 includes an intake purification device 430 and a throttle body 431 connected to an intake port on the rear surface of the cylinder portion 422.

The intake air purifying device 430 includes an air cleaner box 435, a partition wall 436 that partitions the inside of the air cleaner box 435, an air cleaner element 437 provided in the partition wall 436, an intake duct 438 that takes in air intake into the air cleaner box 435, and an air cleaner box. It includes a connecting pipe 439 that connects the 435 to the throttle body 431.
Further, the intake purification device 430 includes an intake duct upstream guide member 440 that guides the intake air to the intake duct 438 on the upstream side of the intake duct 438, and an intake duct that guides the intake air to the air cleaner element 437 on the downstream side of the intake duct 438. A downstream guide member 465 and a connecting pipe upstream guide member 470 that guides intake air to the connecting pipe 439 on the upstream side of the connecting pipe 439 are provided.

The air cleaner box 435 is a box-shaped member arranged between the left and right seat frames 418. The air cleaner box 435 is located above the front of the rear wheel 403 and below the seat 414, and is covered by the seat 414 from above.

The partition wall 436 divides the inside of the air cleaner box 435 into a dirty side 447D on the upstream side of the air cleaner element 437 and a clean side 447C on the downstream side of the air cleaner element 437. The partition wall 436 is a plate-shaped member arranged so that the plate thickness direction is directed in the vertical direction, and partitions the inside of the air cleaner box 435 in the vertical direction.

The air cleaner element 437 is a plate-shaped member arranged so that the plate thickness direction is directed in the vertical direction, and is supported by the partition wall 436. The air cleaner element 437 is arranged so as to be inclined forward downward when viewed from the side of the vehicle.

The dirty side 447D is a room through which the intake air flows before passing through the air cleaner element 437, and is provided in the lower part of the air cleaner box 435.
The clean side 447C is a room through which the intake air after being purified through the air cleaner element 437 flows, and is provided in the upper part of the air cleaner box 435.
The air cleaner element 437 includes an element inlet surface 437a exposed to the dirty side 447D and an element outlet surface 437b exposed to the clean side 447C.

The intake duct 438 extends from the rear part of the air cleaner box 435 to the rear outside the air cleaner box 435, and communicates the dirty side 447D with the space outside the air cleaner box 435.
The intake duct 438 extends rearward through the space between the seat 414 and the rear fender 444. Further, the intake duct 438 is located between the left and right seat frames 418.

The rear end of the intake duct 438 is the upstream end 438a of the intake duct 438 in the flow of intake air. The intake duct 438 takes in outside air as intake air from the duct inlet 438b on the rear end surface of the upstream end portion 438a.
The front end of the intake duct 438 is the downstream end 438c of the intake duct 438 in the flow of intake air. The downstream end portion 438c extends back and forth below the element inlet surface 437a and substantially parallel to the element inlet surface 437a. The intake air flows into the dirty side 447D from the duct outlet 438d on the front end surface of the downstream end portion 438c.
A cup-shaped intake duct downstream guide member 465 that opens toward the element inlet surface 437a is attached to the downstream end 438c of the intake duct 438. The intake duct downstream side guide member 465 guides the intake air flowing into the dirty side 447D from the duct outlet 438d to the element inlet surface 437a.

The connection pipe 439 penetrates the front surface of the air cleaner box 435 from the inside of the clean side 447C, extends forward to the outside of the air cleaner box 435, and is connected to the throttle body 431.
The upstream end 439a in the intake flow of the connecting pipe 439 is located above the element outlet surface 437b in the clean side 447C and extends back and forth substantially parallel to the element outlet surface 437b. The intake air in the clean side 447C flows into the connecting pipe 439 from the connecting pipe inlet 439c on the rear end surface of the upstream end portion 439a.

A guide member 470 on the upstream side of the connecting pipe is attached to the upstream end portion 439a of the connecting pipe 439. The connecting pipe upstream side guide member 470 guides the intake air flowing into the clean side 447C from the element outlet surface 437b to the connecting pipe inlet 439c.
The guide member 470 on the upstream side of the connecting pipe has a cup shape in which a hollow spherical body is cut at the guide opening 470a to form a hemisphere, and the cup shape is further cut at the outlet opening 470b substantially orthogonal to the guide opening 470a. It is a cup-shaped member of.
The guide member 470 on the upstream side of the connecting pipe is arranged so that the guide opening 470a, which is the cup-shaped opening surface, faces the element outlet surface 437b side.
The cup-shaped inner surface of the connecting pipe upstream side guide member 470 is a curved connecting pipe upstream side guide surface 471 that guides the intake air toward the connecting pipe inlet 439c.
The upstream end 439a of the connecting pipe 439 enters the inside of the connecting pipe upstream guide surface 471 from the outlet opening 470b.
The inner diameter of the guide opening 470a of the connecting pipe upstream side guide member 470 is larger than the inner diameter of the connecting pipe inlet 439c of the connecting pipe 439.

FIG. 8 is a perspective view of the peripheral portions of the intake duct 438 and the intake duct upstream side guide member 440 with the seat 414 removed, as viewed from above.
With reference to FIGS. 7 and 8, the intake duct upstream guide member 440 is located upstream of the upstream end 438a of the intake duct 438 and behind the upstream end 438a in the intake flow. The intake duct upstream side guide member 440 is attached to the outer periphery of the upstream side end portion 438a.

The intake duct upstream side guide member 440 includes a guide portion 450 that guides the intake air toward the duct inlet 438b of the upstream end portion 438a of the intake duct 438, and a duct mounting portion 451 that is attached to the intake duct 438.

The guide portion 450 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spherical body in substantially half.
The cup-shaped inner surface of the guide portion 450 is a concave curved duct upstream side guide surface 452. The guide inlet opening 453, which is an opening on the concave curved surface of the duct upstream guide surface 452, exposes the duct upstream guide surface 452 to the outside in the cup shape of the guide portion 450.

The peripheral edge portion 452a of the duct upstream side guide surface 452 that partitions the guide entrance opening 453 has an arc shape.
The apex 452b of the concave curved surface of the guide surface 452 on the upstream side of the duct is located at the bottom of the inner surface in the cup shape of the guide portion 450. The inner diameter of the guide surface 452 on the upstream side of the duct increases from the apex 452b toward the guide inlet opening 453 side.
Further, the guide portion 450 includes a notch opening 475 in which a portion around the guide entrance opening 453 is notched in the guide portion 450.

The guide member 440 on the upstream side of the intake duct is arranged so that the guide inlet opening 453 of the guide portion 450 faces the front of the vehicle.
The notched opening 475 includes an upper surface opening 475a in which the upper surface of the guide portion 450 is notched, and a pair of side surface openings 475b in which the left and right side surfaces of the guide portion 450 are notched.

The guide member 440 on the upstream side of the intake duct is arranged so that the guide inlet opening 453 of the guide portion 450 faces the duct inlet 438b of the upstream end portion 438a of the intake duct 438. The guide entrance opening 453 opens toward the front side of the vehicle.
The inner diameter of the guide inlet opening 453 of the guide portion 450 is larger than the inner diameter of the duct inlet 438b of the intake duct 438 and the outer diameter of the upstream end portion 438a.

A band member 476 is attached to the outer periphery of the upstream end portion 438a of the intake duct 438. The band member 476 is provided so as to wrap around the outer periphery of the upstream end portion 438a.
The duct mounting portion 451 of the intake duct upstream side guide member 440 extends forward with respect to the guide inlet opening 453 and is fixed to the band member 476. That is, the intake duct upstream side guide member 440 is supported by the intake duct 438 via the band member 476.

With reference to FIGS. 7 and 8, the outside air flows as the intake air W from the guide inlet opening 453 and the notch opening 475 of the intake duct upstream side guide member 440 into the inside of the concave curved surface of the duct upstream side guide surface 452. do. The intake W flows to the apex 452b side along the duct upstream side guide surface 452, then turns back to the front side in the vicinity of the apex 452b, and flows into the duct inlet 438b at the upstream end 438a of the intake duct 438.

As described above, according to the second embodiment to which the present invention is applied, the intake duct upstream side guide member 440 is fixed to the intake duct 438.
According to this configuration, the assembly error of the intake duct upstream side guide member 440 with respect to the intake duct 438 can be reduced, and the intake duct upstream side guide member 440 can be fixed at the correct position.

[Third Embodiment]
Hereinafter, a third embodiment to which the present invention is applied will be described with reference to FIGS. 9 to 10.
The third embodiment describes a motorcycle 501 different from the motorcycle 201 of the first embodiment.

FIG. 9 is a left side view of the motorcycle 501 according to the third embodiment. FIG. 10 is a cross-sectional view taken along the line XX of FIG.
The motorcycle 501 is a saddle-riding vehicle having an engine 511 between the front wheels 502 and the rear wheels 503.
The motorcycle 501 includes an intake device 525 behind the engine 511 and below the occupant seat 514.
The intake device 525 includes an intake purification device 530 and a throttle body 531 connected to an intake port of the engine 511.

The intake air purifying device 530 includes an air cleaner box 535, a partition wall 536 that partitions the inside of the air cleaner box 535, an air cleaner element 537 provided in the partition wall 536, an intake duct 538 that takes in air intake into the air cleaner box 535, and an air cleaner box. It includes a connecting pipe 539 that connects the 535 to the throttle body 531.

Further, the intake purification device 530 includes an intake duct upstream guide member 540 that guides the intake air to the intake duct 538 on the upstream side of the intake duct 538, and an intake duct that guides the intake air to the air cleaner element 537 on the downstream side of the intake duct 538. A downstream guide member 565 and a connecting pipe upstream guide member 570 that guides the intake air to the connecting pipe 539 on the upstream side of the connecting pipe 539 are provided.
The intake duct upstream side guide member 540 has the same structure and function as the intake duct upstream side guide member 240 of the second embodiment, and detailed description thereof will be omitted.
The intake duct downstream side guide member 565 has the same structure and function as the intake duct downstream side guide member 265 of the second embodiment, and detailed description thereof will be omitted.
The connecting pipe upstream side guide member 570 has the same structure and function as the connecting pipe upstream side guide member 270 of the second embodiment, and detailed description thereof will be omitted.

The partition wall 536 and the air cleaner element 537 partition the inside of the air cleaner box 535 in the vehicle width direction, and the dirty side 547D is partitioned on one side in the vehicle width direction with respect to the partition wall 536 and on the other side in the vehicle width direction with respect to the partition wall 536. The clean side 547C is partitioned.
The partition wall 536 and the air cleaner element 537 are plate-shaped members arranged so that the plate thickness direction is directed to the vehicle width direction.

The intake duct 538 extends rearward from the rear of the air cleaner box 535 and communicates the dirty side 547D with the space outside the air cleaner box 535.
The rear end of the intake duct 538 is the upstream end 538a of the intake duct 538 in the flow of intake air. A guide member 540 on the upstream side of the intake duct is attached to the upstream end portion 538a.
The front end of the intake duct 538 is the downstream end 538c of the intake duct 538 in the flow of intake air. A guide member 565 on the downstream side of the intake duct is attached to the downstream end portion 538c.

The connection pipe 539 extends forward from the inside of the clean side 547C through the front surface of the air cleaner box 535 and is connected to the throttle body 531.
The rear end of the connecting pipe 539 is the upstream end 539a of the intake flow of the connecting pipe 539. A guide member 570 on the upstream side of the connecting pipe is attached to the upstream end portion 539a.

[Fourth Embodiment]
Hereinafter, a fourth embodiment to which the present invention is applied will be described with reference to FIGS. 11 to 12.
The fourth embodiment describes the motorcycle 601 which is different from the motorcycle 201 of the first embodiment.

FIG. 11 is a left side view of the motorcycle 601 according to the fourth embodiment. FIG. 12 is a cross-sectional view taken along the line XII-XII of FIG.
The motorcycle 601 is a saddle-riding vehicle having a seat 614 for occupants between the front wheels 602 and the rear wheels 603.
The motorcycle 601 is a scooter-type saddle-riding vehicle equipped with a unit swing engine 611 that integrally includes a swing arm portion 611a that swingably supports the rear wheels 603 on the vehicle body and an engine 611b.

The intake device 625 is attached to the upper surface of the swing arm portion 611a and swings up and down integrally with the unit swing engine 611.
The intake device 625 includes an intake purification device 630 and a throttle body (not shown) connected to the intake port of the engine 611b.

The intake air purifying device 630 includes an air cleaner box 635, a partition 636 that partitions the inside of the air cleaner box 635, an air cleaner element 637 provided in the partition 636, an intake duct 638 that takes in intake air into the air cleaner box 635, and an air cleaner box. It includes a connecting pipe 639 that connects the 635 to the throttle body.

Further, the intake purification device 630 includes an intake duct upstream guide member 640 that guides the intake air to the intake duct 638 on the upstream side of the intake duct 638, and an intake duct that guides the intake air to the air cleaner element 637 on the downstream side of the intake duct 638. A downstream guide member 665 and a connecting pipe upstream guide member 670 that guides intake air to the connecting pipe 639 on the upstream side of the connecting pipe 639 are provided.
The intake duct upstream side guide member 640 has the same structure and function as the intake duct upstream side guide member 240 of the second embodiment, and detailed description thereof will be omitted.
The intake duct downstream side guide member 665 has the same structure and function as the intake duct downstream side guide member 265 of the second embodiment, and detailed description thereof will be omitted.
The connecting pipe upstream side guide member 670 has the same structure and function as the connecting pipe upstream side guide member 270 of the second embodiment, and detailed description thereof will be omitted.

The air cleaner box 635 is arranged on the outer side of the rear wheel 603. A side cover 635a is attached to the outer surface of the air cleaner box 635.
The partition wall 636 and the air cleaner element 637 partition the inside of the air cleaner box 635 in the vehicle width direction, the dirty side 647D is partitioned outside the vehicle width direction with respect to the partition wall 636, and the clean side is inside the vehicle width direction with respect to the partition wall 636. 647C is partitioned.
The partition wall 636 and the air cleaner element 637 are plate-shaped members arranged so that the plate thickness direction is directed to the vehicle width direction.

The intake duct 638 extends forward from the front portion of the air cleaner box 635 to communicate the dirty side 647D to the space outside the air cleaner box 635.
The front end of the intake duct 638 is the upstream end 638a of the intake duct 638 in the flow of intake air. A guide member 640 on the upstream side of the intake duct is attached to the upstream end portion 638a. The intake duct upstream side guide member 640 is covered from the side by the side cover 635a.
The rear end of the intake duct 638 is the downstream end 638c of the intake duct 638 in the flow of intake air. A guide member 665 on the downstream side of the intake duct is attached to the downstream end portion 638c.

The connection pipe 639 penetrates the front surface of the air cleaner box 635 from inside the clean side 647C, extends forward, and is connected to the throttle body.
The rear end of the connecting pipe 639 is the upstream end 639a in the intake flow of the connecting pipe 639. A guide member 670 on the upstream side of the connecting pipe is attached to the upstream end portion 639a.

211,411 Engine 230,430 Intake air purifier 235,435 Air cleaner box 239,439 Connection pipe 239a, 439a Upstream end (upstream end of connection pipe)
239c, 439c Connection pipe inlet 239d Center 237,437 Air cleaner element 237b, 437b Element outlet surface 247C, 447C Clean side 247D, 447D Dirty side 270,470 Connection pipe upstream side guide member 270a, 470a Guide opening 270c End 270d Tangent 271,471 Guide surface on the upstream side of the connecting pipe 271a Bottom (farthest part)
L1 distance (distance between the center of the entrance opening and the exit surface)
L2 distance (distance between the part of the guide surface on the upstream side of the connecting pipe that is farthest from the element outlet surface and the element outlet surface)

Claims (11)

1. From the air cleaner box (235,435) whose inside is divided into the dirty side (247D, 447D) and the clean side (247C, 447C) by the air cleaner element (237,437) and the clean side (247C, 447C). In an intake air cleaner including a connecting pipe (239,439) through which intake air flowing toward the engine (211 and 411) passes.
   Inside the clean side (247C, 447C), a connecting pipe upstream side guide member that guides intake air to the connecting pipe inlet (239c, 439c) at the upstream end (239a, 439a) of the connecting pipe (239,439). (270,470) are provided,
   The connecting pipe upstream side guide member (270,470) is an opening in a concave curved surface of the connecting pipe upstream side guide surface (271,471) and the connecting pipe upstream side guide surface (271,471). With certain guide openings (270a, 470a)
   An intake air purifying device characterized in that the guide openings (270a, 470a) are larger than the connection pipe inlets (239c, 439c).
2. The claim is that the guide surface (271) on the upstream side of the connecting pipe is a concave curved surface recessed on the opposite side to the element outlet surface (237b) which is the outlet of the intake air in the air cleaner element (237). 1. The intake purification device according to 1.
3. At least a part of the tangent line (270d) located at the end (270c) on the element outlet surface (237b) side of the tangent line of the connecting pipe upstream side guide surface (271) is directed to the element outlet surface (237b). 2. The intake purification device according to claim 2.
4. The intake purification device according to claim 2 or 3, wherein the guide opening (270a) opens toward the element outlet surface (237b).
5. The intake air purifying device according to any one of claims 2 to 4, wherein the guide opening (270a) is arranged in a direction along the element outlet surface (237b).
6. The element outlet surface (237b) of the connecting pipe upstream guide surface (271) with respect to the distance (L1) between the center (239d) of the connecting pipe inlet (239c) and the element outlet surface (237b). The intake purification device according to any one of claims 2 to 5, wherein the distance (L2) between the farthest portion (271a) and the element outlet surface (237b) is larger.
7. When the upstream end (239a) of the connecting pipe (239) is viewed in the axial direction, the upstream guide surface (271) of the connecting pipe is the upstream end (239a) of the connecting pipe (239). The present invention according to any one of claims 1 to 6, wherein the guide surface (271) on the upstream side of the connecting pipe has a diameter larger than the inner circumference of the connecting pipe (239) and surrounds the connecting pipe (239) from the periphery. Intake purification device.
8. Claims 1 to 7 are characterized in that at least a part of the guide surface (271) on the upstream side of the connecting pipe overlaps the inlet (239c) of the connecting pipe when viewed in the axial direction of the connecting pipe (239). The intake purification device according to any one of.
9. Claims 1 to 8 characterized in that at least a part of the connecting pipe upstream side guide surface (271) overlaps the upstream side end portion (239a) from the outer peripheral side in the axial direction of the connecting pipe (239). The intake purification device according to any one of.
10. The intake purification device according to any one of claims 1 to 9, wherein the guide member (270) on the upstream side of the connecting pipe has a plate shape.
11. Claims 1 to 10 are characterized in that the upstream end portion (239a) is arranged inside the concave curved surface of the connection pipe upstream guide surface (271) with respect to the guide opening (270a). The intake purification device according to any one of.

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