CN115335597B

CN115335597B - Inlet air purifying device

Info

Publication number: CN115335597B
Application number: CN202180024787.3A
Authority: CN
Inventors: 佐藤淳也; 木下亮辅; 新村裕幸; 上田贤
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2020-03-31
Filing date: 2021-03-11
Publication date: 2023-12-05
Anticipated expiration: 2041-03-11
Also published as: CN115335597A; WO2021200021A1; JP7266146B2; JPWO2021200021A1; BR112022019328A2

Abstract

In the intake air purifying device, the intake air is easily flowed into the connecting pipe, and the intake efficiency can be improved. The intake air purifying apparatus includes: an air cleaner case (235) the interior of which 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 an intake gas flowing from the cleaning side (247C) toward the engine (211) side passes, wherein a connection pipe upstream side guide member (270) that guides the intake gas to a connection pipe inlet (239C) of an upstream side end (239 a) of the connection pipe (239) is provided in the cleaning side (247C), the connection pipe upstream side guide member (270) includes a connection pipe upstream side guide surface (271) having a concave surface shape and a guide opening (270 a) that is an opening of the concave surface of the connection pipe upstream side guide surface (271), and the guide opening (270 a) is larger than the connection pipe inlet (239C).

Description

Inlet air purifying device

Technical Field

The present invention relates to an intake air purifying apparatus.

Background

Conventionally, there is known an intake air purifying apparatus including: an air cleaner case whose interior is divided into a dirty side and a clean side by an air cleaner element; and a connection pipe through which an intake gas flowing from the cleaning side toward the engine side passes (for example, refer to patent document 1). In a saddle-type vehicle, an intake air purifying device has various shapes and arrangement places according to the kind of vehicle.

Prior art literature

Patent literature

Patent document 1: international publication No. 2019/142279

Disclosure of Invention

Problems to be solved by the invention

However, in the intake air purifying device, depending on the shape of the inside of the air cleaner case and the position of the upstream side end portion of the connection pipe, it is difficult for the intake air to flow from the cleaning side to the engine side. For example, when the intake air purifying device is disposed in a saddle-type vehicle, if the intake efficiency becomes low, the response of the engine is delayed, particularly in a low rotation speed region of the engine, and drivability is impaired.

The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve intake efficiency by facilitating flow of intake gas to a connection pipe in an intake air purification device.

Means for solving the problems

The entire content of japanese patent application-japanese patent application 2020-064279, which was filed on even 31 days in 3 months in 2020, is included in this specification.

The intake air purification device is provided with: the air cleaner boxes 235, 435, the interiors of which are divided into dirty sides 247D, 447D and clean sides 247C, 447C by air cleaner elements 237, 437; and connection pipes 239 and 439 through which intake gas flowing from the cleaning sides 247C and 447C toward the engines 211 and 411 passes, wherein connection pipe upstream guide members 270 and 470 for guiding the intake gas to connection pipe inlets 239C and 439C of upstream side ends 239a and 439a of the connection pipes 239 and 439 are provided in the cleaning sides 247C and 447C, and the connection pipe upstream guide members 270 and 470 include connection pipe upstream guide surfaces 271 and 471 having a concave curved shape and guide openings 270a and 470a as openings of the concave curved surfaces of the connection pipe upstream guide surfaces 271 and 471, and the guide openings 270a and 470a are larger than the connection pipe inlets 239C and 439C.

In the above configuration, the connection pipe upstream guide surface 271 may be a concave curved surface recessed toward the opposite side from the element outlet surface 237b, which is the outlet of the intake air in the air cleaner element 237.

In the above configuration, at least a part of a tangent 270d of the end 270c located on the element outlet surface side among tangents of the connection pipe upstream side guide surface 271 may be directed toward the element outlet surface 237b.

In the above configuration, the guide opening 270a may be opened toward the element outlet surface 237b.

In the above configuration, the guide opening 270a may be arranged along the element outlet surface 237b.

In the above configuration, a distance L2 between the element outlet surface 237b and a portion 271a of the connecting pipe upstream guide surface 271 farthest from the element outlet surface 237b may be larger than a distance L1 between the element outlet surface 237b and a center 239d of the connecting pipe inlet 239 c.

In the above configuration, when the upstream end 239a of the connection pipe 239 is viewed in the axial direction, the diameter of the connection pipe upstream guide surface 271 may be larger than the diameter of the inner periphery of the upstream end 239a of the connection pipe 239, and the connection pipe upstream guide surface 271 may surround the connection pipe 239 from the periphery.

In the above configuration, at least a part of the connection pipe upstream side guide surface 271 may overlap the connection pipe inlet 239c when viewed in the axial direction of the connection pipe 239.

In the above configuration, at least a part of the connecting pipe upstream side guide surface 271 may overlap the upstream side end 239a from the outer circumferential side in the axial direction of the connecting pipe 239.

In the above configuration, the connecting pipe upstream guide 270 may be plate-shaped.

In the above configuration, the upstream end 239a may be disposed inside the concave surface of the connection pipe upstream guide surface 271 with respect to the guide opening 270 a.

Effects of the invention

The intake air purification device is provided with: an air cleaner case whose interior is divided into a dirty side and a clean side by an air cleaner element; and a connecting pipe through which the intake gas flowing from the cleaning side toward the engine side passes, wherein a connecting pipe upstream side guide member that guides the intake gas to a connecting pipe inlet at an upstream side end of the connecting pipe is provided in the cleaning side, the connecting pipe upstream side guide member having a connecting pipe upstream side guide surface in a concave curved shape and a guide opening portion that is an opening portion of the concave curved surface of the connecting pipe upstream side guide surface, the guide opening portion being larger than the connecting pipe inlet.

According to this configuration, the cleaning-side intake gas enters the connecting pipe upstream guide member from the guide opening larger than the connecting pipe inlet of the connecting pipe, is guided by the concave curved connecting pipe upstream guide surface, and flows toward the connecting pipe inlet of the connecting pipe. Therefore, the intake air can be easily sucked into the connection pipe by the connection pipe upstream side guide member, and the intake efficiency can be improved.

In the above configuration, the upstream guide surface of the connection pipe may be a curved surface having a concave shape, and may be recessed toward the opposite side from the element outlet, which is the outlet of the intake air in the air cleaner element.

According to this structure, the intake air flowing from the element outlet surface of the air cleaner element can be efficiently made to flow to the connection pipe inlet by the connection pipe upstream side guide surface.

In the above configuration, at least a part of a tangent line of the end portion on the element outlet face side among tangent lines of the guide face on the upstream side of the connection pipe may be directed toward the element outlet face.

According to this configuration, the intake gas flowing from the element outlet toward the connection pipe side can be smoothly introduced from the guide opening into the connection pipe upstream guide member, and the intake efficiency can be improved.

In the above configuration, the guide opening may be opened toward the element outlet surface.

In the above configuration, the guide opening may be disposed along the element outlet surface.

According to this structure, the intake gas can be efficiently introduced from the guide opening into the guide member on the upstream side of the connection pipe.

In the above configuration, the distance between the element outlet surface and the portion of the element outlet surface that is farthest from the element outlet surface in the upstream guide surface of the connection pipe may be larger than the distance between the element outlet surface and the center of the connection pipe inlet.

According to this configuration, the intake air can be guided by the guide surface on the upstream side of the connection pipe in a wide range, and the intake air can be efficiently flowed to the inlet of the connection pipe.

In the above configuration, the diameter of the connecting pipe upstream guide surface may be larger than the diameter of the inner periphery of the upstream end portion of the connecting pipe when viewed in the axial direction of the connecting pipe, and the connecting pipe upstream guide surface may surround the connecting pipe from the periphery.

According to this configuration, the connecting pipe upstream side guide surface having a larger diameter than the inner periphery of the upstream side end portion of the connecting pipe surrounds the connecting pipe from the periphery, so that the intake air can be efficiently flowed to the connecting pipe inlet by the connecting pipe upstream side guide surface.

In the above configuration, when the upstream end portion of the connection pipe is viewed in the axial direction, at least a part of the connection pipe upstream guide surface may overlap with the connection pipe inlet.

In the above configuration, at least a part of the connecting pipe upstream side guide surface may overlap with the upstream side 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 connecting pipe upstream guide surface to the upstream end portion, and the intake air can be efficiently flowed to the connecting pipe inlet.

In the above configuration, the upstream guide member of the connection pipe may be plate-shaped.

According to this configuration, the volume occupied by the guide member on the upstream side of the connection pipe can be reduced, and the volume on the cleaning side can be ensured.

In the above configuration, the upstream end portion may be disposed inside the concave curved surface of the upstream guide surface of the connection pipe with respect to the guide opening.

Drawings

Fig. 1 is a left side view of the motorcycle.

Fig. 2 is a sectional view taken along line II-II in fig. 1.

Fig. 3 is a cross-sectional view taken along line III-III in fig. 2.

Fig. 4 is a cross-sectional view taken along line IV-IV in fig. 3.

Fig. 5 is a sectional view taken along line V-V in fig. 4.

Fig. 6 is a side view of the connecting pipe upstream side guide member as seen 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 in a state where the seat is 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 line X-X in fig. 9.

Fig. 11 is a left side view of the motorcycle according to the fourth embodiment.

Fig. 12 is a cross-sectional view taken along line XII-XII in fig. 11.

Detailed Description

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

First embodiment

A first embodiment to which the present invention is applied will be described below with reference to fig. 1 to 6.

Fig. 1 is a left side view of a motorcycle 201 according to a first embodiment.

The motorcycle 201 is a vehicle including: an engine 211 as a power unit is supported by the frame 210, a front fork 212 for supporting the front wheels 202 so as to be steerable is supported by the front end of the frame 210 so as to be steerable, and a swing arm 213 for supporting the rear wheels 203 is provided on the rear side of the frame 210.

The motorcycle 201 is a saddle-type vehicle in which an occupant sits astride a seat 214, and the seat 214 is provided above the rear portion of the frame 210.

The motorcycle 201 includes a pair of left and right side covers 215 that cover the vehicle body such as the frame 210.

The frame 210 includes: a front vertical pipe 217 provided at a front end of the frame 210; 1 main frame 218 extending rearward and downward from the front riser 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 extending in the vehicle width direction, and a cylinder portion 222 that extends forward of the vehicle from a front surface of the crankcase 221.

The cylinder portion 222 has: a cylinder 222a that accommodates a piston (not shown) that reciprocates back and forth; a cylinder head 222b connected to a front surface of the cylinder 222 a; and a head cover 222c that covers the front surface of the cylinder head 222 b.

The engine 211 is a horizontal engine in which an axis 222d of the cylinder 222a extends substantially horizontally in the vehicle front-rear direction in a side view of the vehicle.

The engine 211 is supported by the frame 210 and is disposed below the main frame 218 in front of the pivot frame 219. The cylinder portion 222 extends forward and backward below the main frame 218.

An intake device 225 that supplies intake air to the engine 211 is disposed above the cylinder portion 222.

An exhaust pipe 226 of the engine 211 extends rearward from a lower surface of the cylinder head 222 b.

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 mounted to the front fork 212.

The swing arm 213 is supported by the 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 mounted between the rear of the swing arm 213 and the rear of the vehicle body.

The fuel tank 223 is disposed between the front riser 217 and the seat 214 above the main frame 218.

Fig. 2 is a sectional view taken along line II-II in fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in fig. 2.

Referring to fig. 2 and 3, the air intake device 225 has: an intake air purifying device 230; a throttle body 231 that adjusts the flow rate of the intake air; and a tubular insulator 232 connecting the throttle body 231 with the intake port of the upper surface of the cylinder head 222 b.

The intake air purifying device 230 includes: an air cleaner box 235; a partition wall 236 separating the air cleaner box 235; an air cleaner element 237 provided to the partition wall 236; an intake duct 238 that introduces intake air into an air cleaner box 235; and a connection pipe 239 connecting the air cleaner box 235 with the throttle body 231.

The intake air purifying device 230 further includes: an intake duct upstream side guide member 240 that guides the intake gas to the intake duct 238 on the upstream side of the intake duct 238; an intake duct downstream side guide member 265 that guides intake air to the air cleaner element 237 on the downstream side of the intake duct 238; and a connecting pipe upstream side guide member 270 that guides the intake gas to the connecting pipe 239 on the upstream side of the connecting pipe 239.

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 disposed 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 case 235 is a box-like member extending in the vehicle width direction across the main frame 218 located at the vehicle width center.

The air cleaner box 235 includes: a box-shaped air cleaner case 245 having one of left and right side surfaces (left side surface) opened outward in the vehicle width direction; and a case cover 246 closing the opening of the side surface of the air cleaner case 245. The case cover 246 is coupled to the peripheral edge portion 245a of the opening portion of the air cleaner case 245.

The partition wall 236 is a plate-like member disposed so that the plate thickness direction is directed in the vehicle width direction, and partitions the air cleaner case 235 in the vehicle width direction.

The partition wall 236 divides the interior of the air cleaner case 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 engagement surfaces of the air cleaner housing 245 and the housing cover 246.

The air cleaner element 237 is a filter that captures dust contained in the intake air. The air cleaner element 237 is a plate-like member disposed 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 has a substantially rectangular shape in a side view of the vehicle.

The air cleaner element 237 and the partition wall 236 are disposed on the left and right sides (left side) in the air cleaner case 235 so that the cleaning side 247C has a larger capacity than the dirty side 247D.

The dirty side 247D is a chamber for flow of intake air prior to passing through the air cleaner element 237, and is formed between the housing cover 246 and the partition wall 236.

The cleaning side 247C is a chamber in which the intake air purified by passing through the air cleaner element 237 flows, and is formed between the partition wall 236 and the air cleaner housing 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 on the dirty side 247D; and a component outlet surface 237b, which is a surface opposite to the component inlet surface 237a, exposed to the cleaning side 247C. The element inlet face 237a and the element outlet face 237b are planar faces and are substantially parallel to each other.

The intake air flows into the air cleaner element 237 from the element inlet face 237a of the dirty side 247D and flows from the element outlet face 237b to the clean side 247C.

The air intake duct 238 extends rearward of the outside of the air cleaner case 235 from the rear surface portion of the housing cover 246, and communicates the dirty side 247D with the space outside the air cleaner case 235.

The intake duct 238 is a pipe having a substantially circular cross section, and extends in the vehicle front-rear direction in the dirty side 247D. The air intake duct 238 is disposed on the vehicle width direction outer side of the element inlet surface 237a on the dirty side 247D, and extends in the vehicle front-rear direction substantially parallel to the element inlet surface 237a so as to extend along the element inlet surface 237 a.

The rear end portion of the intake duct 238 is an upstream-side end portion 238a of the intake duct 238 in which the intake gas flows. The intake duct 238 introduces outside air as intake gas from a duct inlet 238b of the rear end face of the upstream side end 238a.

The front end portion of the intake duct 238 is a downstream side end portion 238c of the intake duct 238 in which the intake gas flows. The duct outlet 238d of the front end surface of the downstream-side end portion 238c opens toward the vehicle front.

The duct outlet 238d is located at a position overlapping the element inlet surface 237a from the vehicle width direction outer side in a side view of the vehicle.

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

The front end of the connection pipe 239 is an upstream end 239a of the connection pipe 239 in the flow of the intake gas. The upstream-side end 239a extends in the vehicle front-rear direction within the cleaning side 247C. The axis 239b of the connecting pipe 239 extends in the vehicle front-rear direction in the cleaning side 247C.

The intake gas in the cleaning side 247C flows into the connecting pipe 239 from the connecting pipe inlet 239C of the front end surface of the upstream side end 239a. The connection pipe inlet 239c is substantially opposite to the front surface 245c of the air cleaner housing 245 from the rear.

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

The intake duct upstream-side guide member 240 is disposed upstream of the upstream-side end 238a of the intake duct 238 and rearward of the upstream-side end 238a in the flow of the intake gas. The intake duct upstream side guide member 240 and the intake duct 238 are covered by the side cover 215 from the outside.

The intake duct upstream guide 240 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spheroid into 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 concave opening of the duct upstream side guide surface 252, that is, the guide inlet opening 253 exposes the duct upstream side guide surface 252 to the outside in the cup shape of the intake duct upstream side guide member 240.

The peripheral edge portion 252a of the duct upstream side guide surface 252 that partitions the guide inlet opening 253 is substantially circular. The guide inlet 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 cup-shaped inner surface of the intake duct upstream side guide member 240. The inner diameter of the pipe upstream side guide surface 252 increases from the apex 252b toward the guide inlet opening 253 side.

The intake duct upstream side guide member 240 is arranged upright so as to guide the inlet opening 253 to face the vehicle front.

The intake duct upstream-side guide member 240 is disposed in an orientation in which the guide inlet opening 253 faces the duct inlet 238b of the upstream-side end 238a of the intake duct 238. The guide inlet opening 253 opens toward the vehicle front side.

The guide inlet opening 253 of the intake duct upstream side guide member 240 has an inner diameter larger than the inner diameter of the duct inlet 238b of the intake duct 238 and the outer diameter of the upstream side end 238 a.

The entirety of the duct inlet 238b in the intake duct 238 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 space is provided in the axial direction of the intake duct 238 between the bottom of the cup shape of the duct upstream side guide surface 252 and the duct inlet 238 b.

Referring to fig. 3, an axis 238e of the intake duct 238 extends in the vehicle front-rear direction. The duct inlet 238b of the intake duct 238 overlaps with the apex 252b of the passage upstream side guide surface 252 as viewed in the axial direction of the intake duct 238.

The duct upstream side guide surface 252 covers the upstream side end 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 238a. That is, the guide inlet opening 253 of the duct upstream side guide surface 252 overlaps the upstream side end 238a from the outer peripheral side in the axial direction of the axis 238e of the upstream side end 238a. The upstream-side end 238a and the duct upstream-side guide surface 252 are continuous in the flow direction of the intake gas of the intake duct 238.

Here, the axial direction of the axis 238e is the flow direction of the intake gas of the intake duct 238.

The intake duct downstream guide member 265 is disposed downstream of the downstream end 238c of the intake duct 238 and forward of the downstream end 238c in the dirty side 247D.

The intake duct downstream guide member 265 is a cup-shaped member having a cup shape obtained by further cutting the inlet opening surface 265b substantially orthogonal to the outlet opening surface 265a, and the cup shape is a cup shape obtained by cutting the hollow spheroid into hemispheres with the outlet opening surface 265 a.

The intake duct downstream guide member 265 is disposed such that the cup-shaped opening surface, i.e., the outlet opening surface 265a thereof faces the element inlet surface 237a side. The outlet opening face 265a overlaps the element inlet face 237a when the vehicle is viewed from a side.

Further, the downstream-side end 238c of the intake duct 238 is inserted into the inlet opening surface 265b of the intake duct downstream-side guide member 265 from the rear, and at least a part of the duct outlet 238d is opened in the intake duct downstream-side guide member 265.

The cup-shaped inner surface of the intake duct downstream side guide member 265 is a guide surface 265c that guides the intake gas toward the element inlet surface 237 a. The guide surface 265c is a concave curved surface whose inner surface in the cup shape is recessed toward the opposite side with respect to the element inlet surface 237a with respect to the outlet opening surface 265 a. The guide surface 265c is inclined so as to approach the element inlet surface 237a as being away from the duct outlet 238d in the blowing direction of the intake air from the duct outlet 238 d.

Fig. 4 is a cross-sectional view taken along line IV-IV in fig. 3. Fig. 5 is a sectional view taken along line V-V in fig. 4. Fig. 6 is a side view of the connection pipe upstream side guide 270 from the air cleaner element 237 side.

Referring to fig. 2 and 4 to 6, connecting pipe upstream guide 270 is disposed upstream of upstream end 239a of connecting pipe 239 and forward of upstream end 239a in cleaning side 247C.

The guide member 270 on the upstream side of the connection pipe is a cup-shaped member having a cup shape obtained by further cutting the hollow spherical body into a hemispherical shape through the guide opening 270a at the outlet opening 270b substantially orthogonal to the guide opening 270 a. The connecting pipe upstream guide 270 is formed by bending a flat plate material into a cup shape, and the connecting pipe upstream guide 270 is formed in a plate shape.

The guide member 270 on the upstream side of the connection pipe is disposed so that the cup-shaped opening surface, that is, the guide opening 270a faces the element outlet surface 237b side.

The cup-shaped inner surface of the connection pipe upstream side guide member 270 is a connection pipe upstream side guide surface 271 that guides the intake gas toward the connection pipe inlet 239c of the connection pipe 239. The connection pipe upstream guide surface 271 is a concave curved surface whose inner surface is concave toward the opposite side with respect to the element outlet surface 237b with respect to the guide opening 270 a.

The guide opening 270a exposes the connection pipe upstream guide surface 271 to the element outlet surface 237b side.

The outlet opening 270b is an opening surface formed by cutting away a part of the side surface of the cup shape.

In the plan view of fig. 4, the outlet opening 270b is provided at the rear of the connecting pipe upstream side guide 270, and opens rearward.

The connecting pipe upstream guide member 270 is disposed so that the guide opening 270a is separated from the element outlet surface 237b by a predetermined distance in the vehicle width direction. The guide opening 270a is arranged along the element outlet surface 237b, and the guide opening 270a is substantially parallel to the element outlet surface 237 b.

When the guide opening 270a is taken as a reference, the concave bottom 271a of the connecting pipe upstream side guide surface 271 is located on the opposite side of the element outlet surface 237b from the guide opening 270 a. The bottom 271a is a portion of the connection pipe upstream side guide surface 271 located at the farthest position from the element outlet surface 237 b. The inner diameter of the connecting pipe upstream side guide surface 271 increases from the bottom 271a toward the guide opening 270 a.

The bottom 271a is located at a bottom surface of the cup-shaped shape of the connecting pipe upstream side guide member 270, and the guide opening 270a is opposed to the bottom surface.

Referring to fig. 4, among the tangential lines of the connection pipe upstream side guide surface 271 of the connection pipe upstream side guide member 270, a tangential line 270d located at the end 270c of the partition guide opening 270a is directed toward the element outlet surface 237b and intersects with the element outlet surface 237 b. The tangential line 270d intersects the element outlet surface 237b at any position of the end 270c as long as it is positioned at the end 270 c. That is, the tangential line 270d intersects the element outlet surface 237b over the entire circumference of the end 270 c. The tangential line 270d may be at least a part of the tangential line 270d located at the end 270c directed toward the element outlet surface 237 b.

When the guide member 270 on the upstream side of the connection pipe is viewed in a direction perpendicular to the element outlet surface 237b, the guide opening 270a overlaps the element outlet surface 237 b. In the present 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 237 b.

The rear portion of the connecting pipe upstream guide 270 is disposed outside the upstream end 239a of the connecting pipe 239 in the vehicle width direction, and covers the upstream end 239a from the opposite side of the element outlet surface 237 b.

The upstream end 239a of the connection pipe 239 enters the inside of the connection pipe upstream guide surface 271 from the outlet opening 270b, and the connection pipe inlet 239c of the upstream end 239a opens toward the front inside of the connection pipe upstream guide surface 271.

At least a part of the connection pipe inlet 239c is disposed inside the connection pipe upstream side guide surface 271 with respect to the guide opening 270 a. Further, the connection pipe inlet 239c is located at the upper and lower intermediate portions in the connection pipe upstream side guide surface 271.

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

That is, the connection pipe upstream side guide surface 271 and the upstream side end 239a of the connection pipe 239 are continuous in the axial direction of the connection pipe 239.

Further, referring to fig. 4, a distance L2 between the concave bottom 271a of the connection pipe upstream side guide surface 271 and the element outlet surface 237b is greater than a distance L1 between the center 239d of the connection pipe inlet 239c of the connection pipe 239 and the element outlet surface 237 b. That is, the connecting pipe upstream side guide surface 271 is offset from the connecting pipe inlet 239c of the connecting pipe 239 to the opposite side of the element outlet surface 237 b.

In the plan view of fig. 4, the front portion 271b of the connection pipe upstream side guide surface 271 is curved so as to approach the element outlet surface 237b side as approaching the front side.

When the connection pipe inlet 239c is viewed in the axial direction of the connection pipe 239, the front portion 271b of the connection pipe upstream side guide surface 271 overlaps with the connection pipe inlet 239c from the front, and covers at least a part of the connection pipe inlet 239c from the upstream side.

When viewed in the axial direction of the connection pipe 239, the inside diameter of the connection pipe upstream side guide surface 271 is larger than the inside diameter of the inner circumference of the connection pipe inlet 239c of the connection pipe 239, that is, the inside diameter of the connection pipe inlet 239 c.

The upstream end 239a is surrounded from above, from the outside in the vehicle width direction, and from below by a connecting pipe upstream guide surface 271 having a larger diameter than the upstream end 239 a.

The connecting pipe upstream guide 270 is a member manufactured in a process different from that of the connecting pipe 239. Therefore, the connection pipe 239 can be formed in a simple shape, and the connection pipe upstream side guide member 270 can be easily formed to have a larger diameter than the connection pipe 239.

The connecting pipe upstream side guide member 270 includes a fixing hole portion 272 penetrating the connecting pipe upstream side guide surface 271 in the vehicle width direction. The fixing hole 272 is provided in the vicinity of the bottom 271 a.

The side wall 245d of the side wall of the air cleaner case 245, which is located outside the connection pipe 239 in the vehicle width direction, includes an engagement portion 273 protruding into the cleaning side 247C.

The connection pipe upstream guide 270 is fixed to the air cleaner case 245 by engaging the engagement portion 273 with the fixing hole 272.

The connection pipe upstream guide member 270 includes a flange portion 274 extending downward from the outer periphery of the connection pipe upstream 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.

Referring to fig. 2 and 3, outside air flows as intake air W from the guide inlet opening 253 of the front surface of the intake duct upstream side guide member 240 into the inside of the concave curved surface of the duct upstream side guide surface 252. The intake air W flows from the guide inlet opening 253 side along the duct upstream side guide surface 252 toward the apex 252b side, and then turns back toward the front side in the vicinity of the apex 252b, and flows into the duct inlet 238b of the upstream side end 238a of the intake duct 238.

Here, since the guide inlet opening 253 of the intake duct upstream side guide member 240 opens toward the vehicle front, the traveling wind when the motorcycle 201 travels forward directly flows into the guide inlet opening 253. Therefore, traveling wind can be efficiently introduced 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 guide member 240 is larger than the inner diameter of the duct inlet 238b of the intake duct 238, the intake air W can be collected by the intake duct upstream guide member 240 and supplied to the duct inlet 238b, and the intake air W can be efficiently flowed into the intake duct 238.

In addition, 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 gas W guided by the duct upstream side guide surface 252 can be made to flow to the duct inlet 238b efficiently.

Further, the duct inlet 238b of the intake duct 238 overlaps with the apex 252b of the duct upstream side guide surface 252 when viewed in the axial direction of the intake duct 238, so that the intake gas W folded back from the vicinity of the apex 252b toward the front side can be made to flow efficiently to the duct inlet 238b.

The intake gas W flowing 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 air W flowing from the duct outlet 238D into the dirty side 247D flows along the curved surface of the guide surface 265c of the intake duct downstream guide member 265, changes its direction toward the element inlet surface 237a side on the vehicle width direction inner side, and flows from the outlet opening surface 265a toward the element inlet surface 237 a. Therefore, the intake air W can be efficiently supplied from the intake duct 238 to the air cleaner element 237.

Referring to fig. 2 to 5, the intake air W flowing into the air cleaner element 237 from the element inlet surface 237a flows into the cleaning side 247C from the element outlet surface 237b, is guided by the connecting pipe upstream guide member 270, and flows into the connecting pipe 239.

Specifically, the intake gas W on the cleaning side 247C flows into the connecting pipe upstream side guide surface 271 from the guide opening 270a, flows rearward along the curved surface of the connecting pipe upstream side guide surface 271, and flows into the connecting pipe 239 from the connecting pipe inlet 239C of the upstream side end 239 a.

The intake gas W of the connection pipe 239 flows through the throttle body 231 and the insulator 232 to the intake port of the upper surface of the cylinder head 222 b.

Here, since the inner diameter of the guide opening 270a of the connecting pipe upstream guide member 270 is larger than the inner diameter of the connecting pipe inlet 239c of the connecting pipe 239, the intake gas W can be collected by the connecting pipe upstream guide surface 271 and supplied to the connecting pipe inlet 239c, and the intake gas W can be efficiently flowed to the connecting pipe 239.

Further, the connection pipe inlet 239c of the connection pipe 239 is located inside the concave curved surface of the connection pipe upstream side guide surface 271, and the connection pipe upstream side guide surface 271 and the connection pipe inlet 239c are continuous in the axial direction of the connection pipe 239. Therefore, the intake gas W guided by the connection pipe upstream side guide surface 271 can be made to flow to the connection pipe inlet 239c efficiently.

As described above, according to the first embodiment to which the present invention is applied, the intake air purifying apparatus 230 includes: an air cleaner case 235, the interior of which 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 gas flowing from the cleaning side 247C toward the engine 211 side passes, a connection pipe upstream guide member 270 that guides the intake gas to a connection pipe inlet 239C of an upstream side end 239a of the connection pipe 239 being provided in the cleaning side 247C, the connection pipe upstream guide member 270 including a connection pipe upstream guide surface 271 having a concave curved surface and a guide opening 270a that is an opening of the concave curved surface of the connection pipe upstream guide surface 271, the guide opening 270a being larger than the connection pipe inlet 239C.

According to this configuration, the intake gas on the cleaning side 247C enters the inside of the connecting pipe upstream guide member 270 from the guide opening 270a larger than the connecting pipe inlet 239C of the connecting pipe 239, is guided by the connecting pipe upstream guide surface 271 having a concave curved surface shape, and flows toward the connecting pipe inlet 239C of the connecting pipe 239. Therefore, the intake gas can be easily sucked into the connection pipe 239 by the connection pipe upstream side guide 270, and the intake efficiency can be improved.

The connection pipe upstream side guide surface 271 is a concave curved surface recessed to the opposite side of the element outlet surface 237b, which is the outlet surface of the intake air in the air cleaner element 237, and the concave bottom 271a of the connection pipe upstream side guide surface 271 is located on the opposite side of the element outlet surface 237b from the guide opening 270 a.

According to this configuration, the intake air flowing from the element outlet surface 237b of the air cleaner element 237 can be efficiently made to flow to the connection pipe inlet 239c by the connection pipe upstream side guide surface 271.

In addition, at least a part of a tangent 270d of the end 270c located on the element outlet surface 237b side among tangents of the connection pipe upstream side guide surface 271 is directed toward the element outlet surface 237b.

According to this configuration, the intake gas flowing from the element outlet surface 237b toward the connection pipe 239 can be smoothly introduced from the guide opening 270a into the connection pipe upstream guide member 270, and the intake efficiency can be improved.

The guide opening 270a opens to the element outlet surface 237 b.

The guide opening 270a is disposed along the element outlet surface 237 b.

According to this structure, the intake gas can be efficiently introduced from the guide opening 270a into the connecting pipe upstream side guide member 270.

In addition, the distance L2 between the bottom 271a and the element outlet surface 237b, which is the farthest portion from the element outlet surface 237b, in the connecting pipe upstream side guide surface 271 is smaller than the distance L1 between the center 239d of the connecting pipe inlet 239c and the element outlet surface 237 b.

According to this configuration, the intake air can be guided by the connecting pipe upstream side guide surface 271 in a wide range, and the intake air can be efficiently flowed to the connecting pipe inlet 239c.

In addition, when the upstream end 239a of the connection pipe 239 is viewed in the axial direction, the diameter of the connection pipe upstream guide surface 271 is larger than the diameter of the inner periphery of the upstream end 239a of the connection pipe 239, and the connection pipe upstream guide surface 271 surrounds the connection pipe 239 from the periphery.

According to this structure, since the connecting pipe upstream side guide surface 271 having a diameter larger than the diameter of the inner periphery of the upstream side end 239a of the connecting pipe 239 surrounds the connecting pipe 239 from the surrounding, the intake air can efficiently flow to the connecting pipe inlet 239c through the connecting pipe upstream side guide surface 271.

In addition, at least a portion of the connection pipe upstream side guide surface 271 overlaps with the connection pipe inlet 239c when viewed in the axial direction of the connection pipe 239.

At least a part of the connecting pipe upstream side guide surface 271 overlaps with the upstream side end 239a from the outer peripheral side in the axial direction of the connecting pipe 239.

According to this configuration, the intake gas can be caused to continuously flow from the connection pipe upstream side guide surface 271 to the upstream side end 239a, and the intake gas can be caused to efficiently flow to the connection pipe inlet 239c.

The connecting pipe upstream guide 270 is plate-shaped.

According to this configuration, the volume occupied by the connecting pipe upstream guide 270 can be reduced, and the volume of the cleaning side 247C can be ensured.

The upstream end 239a is disposed inside the concave surface of the connecting pipe upstream guide surface 271 with respect to the guide opening 270 a.

Further, according to the first embodiment to which the present invention is applied, the intake air purifying apparatus 230 includes: an air cleaner case 235, the interior of which is divided into a dirty side 247D and a clean side 247C by an air cleaner element 237; and an intake duct 238 for introducing outside air as intake air to the dirty side 247D, an intake duct upstream guide member 240 for guiding the intake air to a duct inlet 238b of an upstream end 238a of the intake duct 238 being provided on the outside of the air cleaner case 235 and on the upstream side of the intake duct 238, the intake duct upstream guide member 240 having a duct upstream guide surface 252 having a concave curved surface and a guide inlet opening 253 which is an opening of the concave curved surface of the duct upstream guide surface 252, the guide inlet opening 253 being larger than the duct inlet 238 b.

According to this configuration, the intake air enters the intake duct upstream guide member 240 from the guide inlet opening 253 larger than the duct inlet 238b of the intake duct 238, is guided by the concave curved duct upstream guide surface 252, and flows toward the duct inlet 238b of the intake duct 238. Therefore, the intake duct upstream guide 240 can easily suck the intake air into the intake duct 238, and the intake efficiency can be improved.

The guide inlet opening 253 opens in a direction facing the duct inlet 238b.

With this configuration, since the guide inlet opening 253 opens in a direction facing the duct inlet 238b, the intake air flowing from the guide inlet opening 253 to the concave-curved duct upstream guide surface 252 can be efficiently flowed to the duct inlet 238b.

The intake air purifying device 230 is mounted on the motorcycle 201, and the guide inlet opening 253 opens toward the front of the vehicle.

With this configuration, the traveling wind of the motorcycle 201 traveling forward can be efficiently introduced from the guide inlet opening 253 that opens toward the front of the vehicle to the duct upstream side guide surface 252, and the intake air can be efficiently flowed to the intake duct 238.

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 with the upstream end 238a of the intake duct 238, the flow of the intake air around the upstream end 238a can be stabilized, and the intake efficiency can be improved.

Second embodiment

A second embodiment to which the present invention is applied will be described below with reference to fig. 7 to 8.

The second embodiment describes a motorcycle 401 different from the motorcycle 201 of the first embodiment.

Fig. 7 is a cross-sectional view of a motorcycle 401 according to a second embodiment.

The motorcycle 401 is a vehicle including: an engine 411 is supported by the frame 410, a front fork (not shown) for supporting a front wheel (not shown) so as to be turnable is supported by the front end of the frame 410, and a swing arm (not shown) for supporting the rear wheel 403 is provided on the rear side of the frame 410.

The motorcycle 401 is a saddle-type vehicle in which an occupant sits astride a seat 414.

The frame 410 includes a pair of right and left seat frames 418 extending in the front-rear direction and supporting the seat 414 from below, rearward of the engine 411.

The fuel tank 423 is disposed 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 an upper surface of a front portion of the crankcase 421.

An intake device 425 that supplies intake air to the cylinder portion 422 is disposed rearward of the cylinder portion 422 and below the seat 414.

The motorcycle 401 includes a rear fender 444 covering a space between the left and right seat frames 418 from below.

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

The intake air purifying apparatus 430 includes: an air cleaner box 435; a partition wall 436 separating the air cleaner box 435; an air cleaner element 437 provided to the partition wall 436; an intake duct 438 that introduces intake air into the air cleaner box 435; and a connection tube 439 connecting the air cleaner box 435 to the throttle body 431.

The intake air purifying apparatus 430 includes: an intake duct upstream side guide member 440 that guides intake gas to the intake duct 438 on the upstream side of the intake duct 438; an intake duct downstream side guide member 465 that guides intake air to the air cleaner element 437 on the downstream side of the intake duct 438; and a connection pipe upstream side guide member 470 that guides the intake gas to the connection pipe 439 on the upstream side of the connection pipe 439.

The air cleaner box 435 is a box-like member disposed between the left and right seat frames 418. An 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 interior 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-like member disposed so that the plate thickness direction is oriented in the up-down direction, and partitions the air cleaner case 435 in the up-down direction.

The air cleaner element 437 is a plate-like member arranged with the plate thickness direction directed in the up-down direction, and is supported by the partition wall 436. The air cleaner element 437 is disposed obliquely so as to be lower in front and higher in rear when the vehicle is viewed from the side.

The dirty side 447D is a chamber in which the intake air before passing through the air cleaner element 437 flows, and is provided in the lower part of the air cleaner box 435.

The clean side 447C is a chamber in which the intake air purified by the air cleaner element 437 flows, and is provided in the upper portion 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 air intake duct 438 extends from the rear of the air cleaner box 435 to the rear of the outside of the air cleaner box 435, and communicates the dirty side 447D with the space outside the air cleaner box 435.

The intake duct 438 passes through a space between the seat 414 and the rear fender 444 and extends rearward. In addition, an air intake duct 438 is located between the left and right seat frames 418.

The rear end portion of the intake duct 438 is an upstream-side end portion 438a in the flow of the intake gas of the intake duct 438. The intake duct 438 takes in outside air as intake air from a passage inlet 438b of the rear end face of the upstream-side end portion 438a.

The front end portion of the intake duct 438 is a downstream-side end portion 438c in the flow of the intake gas of the intake duct 438. The downstream end portion 438c extends forward and backward below the element inlet surface 437a substantially parallel to the element inlet surface 437a. The intake air flows from the duct outlet 438D of the front end surface of the downstream end portion 438c into the dirty side 447D.

A cup-shaped intake duct downstream side guide member 465 that opens toward the element inlet face 437a is mounted to the downstream side end portion 438c of the intake duct 438. The intake duct downstream side guide member 465 guides the intake gas flowing from the duct outlet 438D into the dirty side 447D to the element inlet surface 437a.

The connection pipe 439 penetrates the front surface of the air cleaner box 435 from the cleaning side 447C and extends forward of the outside of the air cleaner box 435, and is connected to the throttle body 431.

The upstream end 439a of the connection pipe 439 in the flow of the intake gas is located above the element outlet surface 437b in the cleaning side 447C, and extends back and forth substantially parallel to the element outlet surface 437 b. The intake gas in the cleaning side 447C flows into the connection pipe 439 from the connection pipe inlet 439C of the rear end face of the upstream side end 439 a.

The connection pipe upstream guide 470 is attached to the upstream end 439a of the connection pipe 439. The connection pipe upstream side guide member 470 guides the intake gas flowing from the element outlet surface 437b into the cleaning side 447C to the connection pipe inlet 439C.

The guide member 470 on the upstream side of the connection pipe is a cup-shaped member having a shape obtained by cutting the cup-shaped member further with an outlet opening 470b substantially orthogonal to the guide opening 470a, and the cup-shaped member is a cup-shaped member having a shape in which the hollow spheroid is cut into a hemispherical shape with the guide opening 470 a.

The connecting pipe upstream guide member 470 is disposed such that the cup-shaped opening surface, that is, the guide opening 470a, faces the element outlet surface 437b side.

The cup-shaped inner surface of the connection pipe upstream side guide member 470 is a curved connection pipe upstream side guide surface 471 that guides the intake gas toward the connection pipe inlet 439 c.

The upstream end 439a of the connection pipe 439 enters the connection pipe upstream guide surface 471 from the outlet opening 470 b.

The guide opening 470a of the connecting pipe upstream side guide member 470 has an inner diameter 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 viewed from above with the seat 414 removed.

Referring to fig. 7 and 8, intake duct upstream side guide member 440 is disposed upstream of upstream side end portion 438a of intake duct 438 and rearward of upstream side end portion 438a in the flow of the intake gas. An intake duct upstream side guide member 440 is mounted to the outer periphery of the upstream side end portion 438 a.

The intake duct upstream-side guide member 440 includes: a guide portion 450 that guides the intake gas toward a duct inlet 438b of an upstream-side end portion 438a of the intake duct 438; and a duct mounting portion 451 mounted to the intake duct 438.

The guide 450 is a cup-shaped member having a hemispherical cup shape formed by cutting a hollow spheroid into substantially half.

The cup-shaped inner surface of the guide 450 is a concavely curved duct upstream side guide surface 452. The guide inlet opening 453, which is an opening of the concave 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 450.

The peripheral edge portion 452a of the duct upstream side guide surface 452 that partitions the guide inlet opening 453 is arcuate.

The apex 452b of the concave curved surface of the duct upstream side guide surface 452 is located at the bottom of the cup-shaped inner surface of the guide 450. The inner diameter of the pipe upstream side guide surface 452 increases from the apex 452b toward the guide inlet opening 453.

The guide 450 includes a missing opening 475 formed by cutting out a portion around the inlet opening 453 in the guide 450.

The intake duct upstream side guide member 440 is vertically arranged such that the guide inlet opening 453 of the guide portion 450 faces the vehicle front.

The missing opening 475 includes an upper surface opening 475a formed by cutting out a part of the upper surface of the guide 450, and a pair of side opening 475b formed by cutting out a part of the left and right side surfaces of the guide 450.

The intake duct upstream-side guide member 440 is disposed in such an orientation that the guide inlet opening 453 of the guide portion 450 faces the duct inlet 438b of the upstream-side end portion 438a of the intake duct 438. The guide inlet opening 453 opens toward the vehicle front side.

The inner diameter of the guide inlet opening 453 of the guide portion 450 is larger than the inner diameter of the channel inlet 438b of the intake duct 438 and the outer diameter of the upstream end portion 438 a.

A band member 476 is mounted on the outer periphery of the upstream-side end portion 438a of the intake duct 438. The belt member 476 is provided so as to be wound around the outer periphery of the upstream end portion 438 a.

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 belt member 476. That is, the intake duct upstream side guide member 440 is supported by the intake duct 438 via the belt member 476.

Referring to fig. 7 and 8, the outside air flows as the intake air W into the inside of the concave curved surface of the duct upstream side guide surface 452 from the guide inlet opening 453 and the missing opening 475 of the intake duct upstream side guide member 440. After flowing along the duct upstream side guide surface 452 toward the apex 452b, the intake air W is turned back toward the front side in the vicinity of the apex 452b, and flows into the duct inlet 438b of the upstream side end portion 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.

With this configuration, an assembly error of the intake duct upstream guide member 440 with respect to the intake duct 438 can be reduced, and the intake duct upstream guide member 440 can be fixed at a correct position.

Third embodiment

A third embodiment to which the present invention is applied will be described below with reference to fig. 9 to 10.

The third embodiment is described with respect to a motorcycle 501 different from the motorcycle 201 of the first embodiment.

Fig. 9 is a left side view of a motorcycle 501 according to the third embodiment. Fig. 10 is a cross-sectional view taken along line X-X in fig. 9.

The motorcycle 501 is a saddle-type vehicle including an engine 511 between a front wheel 502 and a rear wheel 503.

The motorcycle 501 includes an intake device 525 behind the engine 511 and below the passenger seat 514.

The intake device 525 includes an intake air purifying device 530 and a throttle body 531 connected to an intake port of the engine 511.

The intake air purifying apparatus 530 includes: an air cleaner box 535; a partition wall 536 separating the air cleaner case 535; an air cleaner element 537 disposed on the partition 536; an intake duct 538 that introduces intake air into the air cleaner box 535; and a connection pipe 539 connecting the air cleaner case 535 with the throttle body 531.

The intake air purifying apparatus 530 further includes: an intake duct upstream-side guide member 540 that guides the intake gas to the intake duct 538 on the upstream side of the intake duct 538; an intake duct downstream side guide member 565 that guides the intake air to the air cleaner element 537 on the downstream side of the intake duct 538; and a connection pipe upstream side guide member 570 that guides the intake gas to the connection pipe 539 on the upstream side of the connection pipe 539.

The intake duct upstream side guide member 540 has the same structure and function as those of the intake duct upstream side guide member 240 of the second embodiment, and detailed description thereof is omitted.

The intake duct downstream guide member 565 has the same structure and function as those of the intake duct downstream guide member 265 of the second embodiment, and detailed description thereof is omitted.

The connection pipe upstream guide 570 has the same structure and function as those of the connection pipe upstream guide 270 of the second embodiment, and detailed description thereof is omitted.

The partition wall 536 and the air cleaner element 537 divide the air cleaner case 535 in the vehicle width direction, and partition a dirty side 547D located on one side in the vehicle width direction with respect to the partition wall 536, and partition a clean side 547C located on the other side in the vehicle width direction with respect to the partition wall 536.

The partition wall 536 and the air cleaner element 537 are plate-like members arranged so that the plate thickness direction is directed in the vehicle width direction.

The intake duct 538 extends rearward from the rear of the air cleaner case 535, and communicates the dirty side 547D with the space outside the air cleaner case 535.

The rear end portion of the intake duct 538 is an upstream end portion 538a in the flow of the intake gas of the intake duct 538. An intake duct upstream side guide 540 is attached to the upstream side end portion 538a.

The front end portion of the intake duct 538 is a downstream end portion 538c in the flow of the intake gas of the intake duct 538. An intake duct downstream guide 565 is attached to the downstream end portion 538c.

The connection pipe 539 penetrates the front surface of the air cleaner case 535 from the cleaning side 547C and extends forward, and is connected to the throttle body 531.

The rear end portion of the connection pipe 539 is an upstream side end portion 539a in the flow of the intake gas of the connection pipe 539. An upstream guide member 570 for connecting the pipe is attached to the upstream end 539a.

Fourth embodiment

A fourth embodiment to which the present invention is applied will be described below with reference to fig. 11 to 12.

The fourth embodiment describes a motorcycle 601 different from the motorcycle 201 of the first embodiment.

Fig. 11 is a left side view of a motorcycle 601 according to the fourth embodiment. Fig. 12 is a cross-sectional view taken along line XII-XII in fig. 11.

The motorcycle 601 is a saddle-type vehicle including a passenger seat 614 between a front wheel 602 and a rear wheel 603.

The motorcycle 601 is a scooter type saddle-type vehicle provided with a unit swing type engine 611, and the unit swing type engine 611 integrally includes a swing arm portion 611a for swingably supporting the rear wheel 603 to a vehicle body and an engine 611b.

The intake device 625 is mounted on the upper surface of the rocker arm portion 611a, and swings up and down integrally with the unit swing type engine 611.

The intake device 625 includes an intake air purifying device 630 and a throttle body (not shown) connected to an intake port of the engine 611b.

The intake air purifying device 630 includes: an air cleaner box 635; a partition wall 636 separating the air cleaner box 635; an air cleaner element 637 provided to the partition wall 636; an intake duct 638 that introduces intake air into the air cleaner box 635; and a connection pipe 639 connecting the air cleaner box 635 to the throttle body.

The intake air purifying device 630 includes: an intake duct upstream side guide 640 that guides the intake gas to the intake duct 638 on the upstream side of the intake duct 638; an intake duct downstream side guide member 665 that guides intake air to the air cleaner element 637 on a downstream side of the intake duct 638; and a connection pipe upstream side guide member 670 that guides the intake gas to the connection pipe 639 on the upstream side of the connection pipe 639.

The intake duct upstream side guide member 640 has the same structure and function as those of the intake duct upstream side guide member 240 of the second embodiment, and detailed description thereof is omitted.

The intake duct downstream side guide member 665 has the same structure and function as those of the intake duct downstream side guide member 265 of the second embodiment, and detailed description thereof is omitted.

The connecting pipe upstream guide member 670 has the same structure and function as those of the connecting pipe upstream guide member 270 of the second embodiment, and detailed description thereof is omitted.

The air cleaner box 635 is disposed 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 divide the air cleaner case 635 in the vehicle width direction, and divide a dirty side 647D located outside the partition wall 636 in the vehicle width direction, and divide a clean side 647C located inside the partition wall 636 in the vehicle width direction.

The partition wall 636 and the air cleaner element 637 are plate-like members disposed so that the plate thickness direction is directed in the vehicle width direction.

The intake duct 638 extends forward from the front of the air cleaner box 635, and communicates the dirty side 647D with the space outside the air cleaner box 635.

The front end portion of the intake passage 638 is an upstream-side end portion 638a in the flow of the intake gas of the intake passage 638. An intake duct upstream guide 640 is mounted at the upstream end 638a. The intake duct upstream side guide member 640 is covered from the side by a side cover 635 a.

The rear end portion of the intake passage 638 is a downstream-side end portion 638c in the flow of the intake gas of the intake passage 638. An intake duct downstream guide member 665 is attached to the downstream end 638c.

The connection pipe 639 penetrates the front surface of the air cleaner case 635 from the cleaning side 647C and extends forward, and is connected to the throttle body.

The rear end of the connection pipe 639 is an upstream-side end 639a in the flow of the intake gas of the connection pipe 639. A connection pipe upstream side guide member 670 is attached to the upstream side end 639a.

[ description of the reference numerals ]

211. 411: an engine;

230. 430: an intake air purifying device;

235. 435: an air cleaner box;

239. 439: a connecting pipe;

239a, 439a: an upstream side end (upstream side end of the connection pipe);

239c, 439c: an inlet of the connecting pipe;

239d: a center;

237. 437). An air cleaner element;

237b, 437b: an element outlet face;

247C, 447C: a cleaning side;

247D, 447D: a dirty side;

270. 470: a connecting pipe upstream side guide member;

270a, 470a: a guide opening portion;

270c: an end portion;

270d: cutting lines;

271. 471: an upstream side guide surface of the connection pipe;

271a: a bottom (furthest part);

l1: distance (distance between the centre of the inlet opening and the outlet face);

l2: distance (distance between the part of the connecting pipe upstream side guide surface farthest from the element outlet surface and the element outlet surface).

Claims

1. An intake air purifying device is provided with: an air cleaner case (235, 435) whose interior is divided into a dirty side (247D, 447D) and a clean side (247C, 447C) by an air cleaner element (237, 437); and connection pipes (239, 439) through which an intake gas flowing from the cleaning side (247C, 447C) toward the engine (211, 411) side passes,

a connecting pipe upstream side guide member (270, 470) for guiding the intake gas to a connecting pipe inlet (239C, 439C) of an upstream side end (239 a, 439 a) of the connecting pipe (239, 439) is provided in the cleaning side (247C, 447C),

the connecting pipe upstream side guide members (270, 470) are provided with connecting pipe upstream side guide surfaces (271, 471) having a concave curved surface shape and guide opening portions (270 a, 470 a) as opening portions of the concave curved surfaces of the connecting pipe upstream side guide surfaces (271, 471),

The guide openings (270 a, 470 a) are larger than the connecting pipe inlets (239 c, 439 c),

the upstream side end portions (239 a, 439 a) are disposed inside the concave curved surface of the connecting pipe upstream side guide surfaces (271, 471) with respect to the guide opening portions (270 a, 470 a).

2. The intake air purifying apparatus according to claim 1, wherein,

the connecting pipe upstream side guide surface (271) is a curved surface of a concave shape, which is recessed to the opposite side with respect to an element outlet surface (237 b) that is an outlet of the intake air on the air cleaner element (237).

3. The intake air purifying apparatus according to claim 2, wherein,

at least a part of a tangent line (270 d) of an end (270 c) located on the element outlet surface (237 b) side among tangents of the connection pipe upstream side guide surface (271) is directed toward the element outlet surface (237 b).

4. An intake air purifying apparatus according to claim 2 or 3, wherein,

the guide opening (270 a) opens to the element outlet face (237 b).

5. The intake air purifying apparatus according to any one of claims 2 to 4, wherein,

the guide opening (270 a) is disposed in an orientation along the element outlet surface (237 b).

6. The intake air purifying apparatus according to any one of claims 2 to 5, wherein,

a distance (L2) between a portion (271 a) of the connecting pipe upstream side guide surface (271) farthest from the element outlet surface (237 b) and the element outlet surface (237 b) is greater than a distance (L1) between a center (239 d) of the connecting pipe inlet (239 c) and the element outlet surface (237 b).

7. The intake air purifying apparatus according to any one of claims 1 to 6, wherein,

when the upstream end (239 a) of the connection pipe (239) is viewed in the axial direction, the diameter of the connection pipe upstream guide surface (271) is larger than the diameter of the inner periphery of the upstream end (239 a) of the connection pipe (239), and the connection pipe upstream guide surface (271) surrounds the connection pipe (239) from the periphery.

8. The intake air purifying apparatus according to any one of claims 1 to 7, wherein,

at least a part of the connecting pipe upstream side guide surface (271) overlaps with the connecting pipe inlet (239 c) when viewed in the axial direction of the connecting pipe (239).

9. The intake air purifying apparatus according to any one of claims 1 to 8, wherein,

At least a part of the connecting pipe upstream side guide surface (271) overlaps the upstream side end (239 a) from the outer peripheral side in the axial direction of the connecting pipe (239).

10. The intake air purifying apparatus according to any one of claims 1 to 9, wherein,

the upstream guide member (270) of the connection pipe is plate-shaped.

11. An intake air purifying device is provided with: an air cleaner case (235, 435) whose interior is divided into a dirty side (247D, 447D) and a clean side (247C, 447C) by an air cleaner element (237, 437); and connection pipes (239, 439) through which an intake gas flowing from the cleaning side (247C, 447C) toward the engine (211, 411) side passes,

When the upstream side ends (239 a, 439 a) of the connection pipes (239, 439) are viewed in the axial direction, the diameter of the connection pipe upstream side guide surfaces (271, 471) is larger than the diameter of the inner periphery of the upstream side ends (239 a, 439 a) of the connection pipes (239, 439), and the connection pipe upstream side guide surfaces (271, 471) surround the connection pipes (239, 439) from the periphery.