JP2011051484A - Intake structure for saddle riding type vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake structure for a saddle riding type vehicle, improving the intake filling efficiency of an engine by suppressing the suction of hot air from the engine through an air chamber. <P>SOLUTION: The engine E is arranged so that a cylinder part 43 is protruded on the front or upper side of a crank case 42, a belt type continuously variable transmission M is arranged on a lateral portion of the crank case 42 of the engine E, and an air cleaner 48 is arranged above the belt type continuously variable transmission M. A transmission cooling duct 52 is arranged along the edge of the air cleaner 48 on the front side of the vehicle body for introducing air into the belt type continuously variable transmission M. The transmission cooling duct 52 shuts off the flow of hot air. A suction port 63 of the air cleaner 48 is arranged outside the transmission cooling duct 52 in the cross direction of the vehicle body beyond an inner-side wall 54a in the cross direction of the vehicle body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an intake structure for a saddle-ride type vehicle such as a motorcycle.

There is known a saddle-ride type vehicle in which an engine and an automatic transmission are supported on a vehicle body together with a rear wheel so as to be swingable (see, for example, Patent Document 1).
In a saddle-ride type vehicle described in Patent Document 1, a cylinder portion projects from a front side of an engine crankcase, and a belt-type continuously variable transmission is integrally attached to a side portion of the crankcase. The air cleaner is arranged on the upper side of the belt type continuously variable transmission.

Japanese Patent No. 3943995

  However, in this saddle-ride type vehicle, since the intake port of the air cleaner is arranged on the upper rear side of the engine, the outside air heated by the engine during traveling of the vehicle is easily taken into the air cleaner, and the intake air charging efficiency of the engine From this point of view, improvement of this point is desired.

  Therefore, the present invention is intended to provide an intake structure for a saddle-ride type vehicle capable of suppressing intake of hot air from the engine from an air chamber and improving the intake charge efficiency of the engine.

The invention according to claim 1, which solves the above problem, includes a crankcase (for example, a crankcase 42 in an embodiment described later) of an engine (for example, an engine E in an embodiment described later) that houses a crankshaft, A cylinder portion of an engine (for example, a cylinder portion 43 in an embodiment described later) that protrudes forward or upward from the crankcase and has a combustion chamber therein, and extends from the side portion of the crankcase to the vehicle body rear side. A belt-type continuously variable transmission (for example, a belt-type continuously variable transmission M in an embodiment described later) for shifting the driving force of the crankshaft and transmitting it to a wheel; and the belt-type continuously variable transmission; A transmission cooling duct for introducing cooling air into the belt type continuously variable transmission (for example, a transmission cooling duct 52 in an embodiment described later) An air chamber (for example, an air cleaner 48 in an embodiment described later) disposed above the belt-type continuously variable transmission and provided in an intake system for supplying air to the cylinder portion. In the intake structure, the transmission cooling duct is disposed along a front portion of the air chamber on the front side of the vehicle body, and an intake port of the air chamber (for example, an intake port 63 in an embodiment described later) is used for the transmission cooling. It is characterized in that the duct is disposed on the outer side in the vehicle width direction than the wall on the inner side in the vehicle width direction (for example, a wall 54a in an embodiment described later).
As a result, when the heat generated in the cylinder portion of the engine becomes hot air and flows to the rear side of the vehicle body, the flow of the hot air is blocked by the transmission cooling duct arranged along the edge of the air chamber. Inhalation at the air intake is blocked.

According to a second aspect of the present invention, in the intake structure of the saddle-ride type vehicle according to the first aspect, the vehicle body extends along the inner wall in the vehicle width direction of the transmission cooling duct at the front portion of the air chamber. A shielding wall (for example, a shielding wall 65 in an embodiment described later) extending forward is provided.
Thus, the shielding wall at the front of the air chamber forms a labyrinth structure with the inner wall of the transmission cooling duct in the vehicle width direction, and this labyrinth structure extends from the inner wall of the transmission cooling duct in the vehicle width direction. Heat transfer toward the air inlet of the air chamber is suppressed.

  According to a third aspect of the present invention, in the intake structure for a saddle-ride type vehicle according to the first or second aspect, the transmission cooling duct is an inner duct part (for example, described later) having an inner wall portion in the vehicle body width direction. The main body plate 52A) in the embodiment and an outer duct part (for example, a cover plate 52B in an embodiment described later) having a wall portion on the outer side in the vehicle body width direction are characterized.

According to a fourth aspect of the present invention, in the intake structure for a saddle-ride type vehicle according to any one of the first to third aspects, an intake port of the transmission cooling duct (for example, an intake port 55 in an embodiment described later). ) Is provided with an intake guide plate (for example, an intake guide plate 57 in an embodiment described later) directed downward.
As a result, air is sucked into the transmission cooling duct from the lower side to the upper side while being guided by the intake guide plate of the intake port.

According to a fifth aspect of the present invention, in the intake structure of the saddle-ride type vehicle according to any one of the first to fourth aspects, the case of the air chamber (for example, a cleaner case 58 in an embodiment described later) is: A left and right divided structure by a case body (for example, a case body 60 in an embodiment described later) that opens in the vehicle body width direction and a cover member (for example, a cover member 61 in an embodiment described later) that closes the opening of the case body; The case main body and the cover member are molded, and the transmission cooling duct is disposed along a mating surface on the vehicle body front side of the case main body and the cover member. .
In this case, the case main body and the cover member project the mating surface portion of the case body to the outermost side due to the relationship of the punching at the time of mold forming and the relationship of the arrangement of the sealing parts of the mating surfaces. For this reason, the transmission cooling duct is arranged along the outermost portion of the case main body and the cover member.

According to a sixth aspect of the present invention, in the intake structure for a saddle-ride type vehicle according to the fifth aspect, the case main body bulges toward the center of the vehicle body width direction, and a front wall (for example, a front wall in an embodiment described later). The wall 60b) is inclined toward the vehicle body rear side toward the vehicle width direction center.
As a result, the hot air flowing from the cylinder portion of the engine toward the front wall of the case body of the air chamber flows in a direction opposite to the air inlet of the air chamber along the inclination of the front wall.

  According to the first aspect of the present invention, the hot air flowing from the cylinder portion of the engine toward the air inlet of the air chamber is blocked by the transmission cooling duct disposed along the edge of the air chamber on the vehicle body front side. Therefore, the intake of hot air from the engine from the air chamber can be suppressed, and the intake air charging efficiency of the engine can be improved.

  According to the invention described in claim 2, a labyrinth structure is formed between the shielding wall at the front portion of the air chamber and the inner wall of the transmission cooling duct in the vehicle width direction, and the air inlet of the air chamber is formed by the labyrinth structure. Since heat transfer in the direction can be further suppressed, an increase in the intake temperature of the air chamber can be further suppressed.

  According to the invention described in claim 3, since the transmission cooling duct has a two-part structure composed of the inner duct part and the outer duct part, the manufacture of the transmission cooling duct is facilitated, and the product cost can be reduced. Become.

  According to the fourth aspect of the present invention, the intake guide plate directed downward is provided at the intake port of the transmission cooling duct, and the air is guided by the intake guide plate at the intake port portion and flows upward from below. As a result, it is possible to effectively prevent the hot air from sucking in from the upper front side of the transmission cooling duct, and to suppress the suction of foreign matter from the intake port.

  According to the fifth aspect of the present invention, the transmission cooling duct is disposed along the outermost portion of the case body and the cover member of the air chamber, so that the transmission cooling duct is increased in size. Therefore, it is possible to prevent the hot air of the engine from flowing in the direction of the air inlet of the air chamber.

  According to the sixth aspect of the present invention, the hot air flowing into the front wall of the case body of the air chamber can be guided in a direction opposite to the air inlet of the air chamber by the inclination of the front wall. Inhalation of hot air from the intake port can be further suppressed.

1 is a side view of a saddle-ride type vehicle according to an embodiment of the present invention. It is the side view which removed the vehicle body cover of the second half part of the saddle-ride type vehicle of one Embodiment of this invention. It is the side view which removed further the components of the second half part of the saddle-ride type vehicle of one embodiment of this invention. FIG. 4 is a view as seen from an arrow A in FIG. 3 of the saddle-ride type vehicle according to the embodiment of the present invention. FIG. 4 is a view taken along arrow A in FIG. 3 including a cross section corresponding to a cross section taken along the line B-B in FIG. It is a disassembled perspective view of the transmission cooling duct employ | adopted with the saddle-riding type vehicle of one Embodiment of this invention. It is an expanded sectional view of the C section of Drawing 5 of a saddle-ride type vehicle of one embodiment of this invention. FIG. 5 is a view taken along arrow D of FIG. 4 of a saddle-ride type vehicle according to an embodiment of the present invention. It is an expanded sectional view of the G section of Drawing 1 of a saddle-ride type vehicle of one embodiment of this invention. It is an expanded sectional view corresponding to the FF section of Drawing 9 of the saddle-ride type vehicle of one embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the directions such as front, rear, left and right in the following description are the same as those in the vehicle unless otherwise specified. In the figure, an arrow FR indicates the front of the vehicle, an arrow LH indicates the left side of the vehicle, and an arrow UP indicates the upper side of the vehicle.

FIG. 1 shows a side surface of a scooter type motorcycle 1 which is an embodiment of a saddle-ride type vehicle. A body frame F of the motorcycle 1 includes a main frame pipe 12 to which the head pipe 11 is coupled at the front end, a cross pipe 13 coupled orthogonally to the rear end of the main frame pipe 12, and left and right sides of the cross pipe 13. A pair of left and right rear frame pipes 14 whose front ends are respectively coupled to the end portions.
The main frame pipe 12 includes a down frame portion 12a inclined rearward and downward from the head pipe 11, and a lower frame portion 12b extending rearward substantially horizontally from the rear end of the down frame portion 12a.

  A front fork 17 having a pair of leg portions 15 disposed on both sides of the front wheel WF and a bridge member 16 connecting the upper ends of the leg portions 15 is supported on the head pipe 11 so as to be rotatable. A front wheel WF is pivotally supported between the lower ends of the leg portions 15. A bar-type handle 18 is coupled to the upper end of the front fork 17.

The front part of the left and right rear frame pipes 14 is a unit swing type comprising an engine E arranged on the front side of the rear wheel WR and a belt type continuously variable transmission M arranged on the left side of the rear wheel WR. A power unit P is supported via a link 19 so as to be swingable up and down. The rear wheel WR is rotatably supported on the right side of the rear part of the power unit P, and a cushion unit 20 is interposed between the left rear frame pipe 14 and the rear part of the power unit P. In the motorcycle 1, a unit swing-type rear suspension is configured by the vertically swingable power unit P that supports the rear wheel WR on the rear end side and the cushion unit 20.
1, 27 and 29 are an article storage box and a fuel tank installed on the upper part of the rear frame pipe 14, and 28 is provided on the upper side of the article storage box 27 and the fuel tank 29 so as to be openable and closable. It is a saddle seat for passenger seating.

The periphery of the vehicle body frame F, the engine E, the storage box 27, the fuel tank 29, and the like is covered with a vehicle body cover 30 made of synthetic resin.
The vehicle body cover 30 includes a front cover 31 covering the periphery of the head pipe 11 from the front side, a front inner cover 32 covering the periphery of the head pipe 11 and the down frame portion 12a from the rear, and left and right covers covering the periphery of the lower frame portion 12b from the side. An underside cover 34, a step floor 37 covering the periphery of the lower frame portion 12b from above between the upper edges of the left and right underside covers 34, and a rear end portion of the step floor 37 are provided. A front center cover 38 that covers the lower side of the front end portion of the seat 28 from the front side, and is provided so as to be connected to the left and right rear sides of the front center cover 38 so that the left and right rear frame pipes 14, the storage box 27 and the fuel tank 29 Left and right rear side covers 36 and left and right rear side covers Provided to span between the rear upper edge portion of the over 36 and a rear center cover 39 for covering the rear lower side of the sheet 28 from the obliquely upward and rearward.

FIG. 2 shows the rear side surface of the motorcycle 1 with the vehicle body cover 30 removed.
Support frames 40 that extend toward the rear side of the vehicle body are coupled to the front inclined portions of the left and right rear frame pipes 14, and the rear end portions of the support frames 40 protrude outside the rear side cover 36 ( (See FIG. 1). A passenger step 41 is foldably supported at the rear end of each support frame 40.

FIG. 3 shows the rear side surface of the motorcycle 1 centering on the power unit P from which the rear frame pipe 14, the cushion unit 20, the saddle riding seat 28, etc. are removed. FIG. 4 is a view of FIG. It is a top view of the power unit P equivalent to a top view).
The engine E of the power unit P includes a crankcase 42 that houses a crankshaft (not shown) and a cylinder portion 43 in which a combustion chamber (not shown) is provided. Although not shown in detail, the cylinder portion 43 includes a cylinder block, a cylinder head, a head cover, and the like, and protrudes from the front end portion of the crankcase 42 toward the oblique upper front side. The cylinder portion 43 projects forward from between the front inclined portions of the left and right rear frame pipes 14 in a state where the power unit P is attached to the vehicle body frame F (see FIG. 2).

  The crankshaft in the crankcase 42 extends along the vehicle body width direction so as to be parallel to the axle of the rear wheel WR, and the left side end portion has a mechanism portion on the input side of the belt type continuously variable transmission M (see FIG. Not shown) and a generator and a cooling fan (both not shown) are connected to the right side end. The cylinder portion 43 is connected to the intake duct 44 on the upper surface side of the front end portion and connected to the exhaust duct 45 on the lower surface side of the front end portion, and extends from the upper wall of the cylinder portion 43 to a part of the crankcase 42. Is covered by an inlet shroud 46. The inside of the inlet shroud 46 is connected to a suction portion of a cooling fan in the crankcase 42 so that heat generated in the cylinder portion 43 is discharged to the right side of the crankcase 42 by the cooling fan.

The crankcase 42 has a front side region (hereinafter referred to as a “main body portion”) that accommodates the crankshaft formed substantially symmetrically to the left and right with respect to the center in the vehicle body width direction. It bulges toward the rear side of the vehicle body at a position biased to the left side of the wheel WR (hereinafter, this region is referred to as a “rear bulge portion”).
A belt type continuously variable transmission M is attached to the left outer side surface extending from the main body portion of the crankcase 42 to the rear bulge portion, and a speed reduction mechanism (not shown) and a rear wheel are arranged on the rear end side of the rear bulge portion. A WR axle (not shown) is supported. The power of the engine E output to the crankshaft is transmitted to the axle of the rear wheel WR via the belt type continuously variable transmission M and the speed reduction mechanism. The belt type continuously variable transmission M extends in the longitudinal direction of the vehicle body so as to straddle the vicinity of the axle of the rear wheel WR from the crankshaft portion.

  The intake duct 44 of the engine E is connected to an air cleaner 48 through a throttle body 47. Outside air filtered by the air cleaner 48 is introduced into the cylinder portion 43 of the engine E through the intake duct 44. The air cleaner 48 is disposed over the crankcase 42 and the belt type continuously variable transmission M.

On the other hand, the exhaust duct 45 of the engine E is pulled out from the lower side of the engine E to the right side of the vehicle body, and is connected to a silencer 49 arranged on the right side of the rear wheel WR.
In the figure, MS is a main stand installed at the front lower end of the crankcase 42, and KP is an engine starting kick pedal installed outside the transmission cover 50 of the belt type continuously variable transmission M. It is.

  By the way, the transmission cover 50 is disposed on the left side of the crankcase 42 and covers the transmission mechanism inside the belt type continuously variable transmission M. The transmission cover 50 is formed on the left side surface on the front end side of the transmission cover 50. Is provided with an intake port 51 for taking cooling air into the transmission cover 50. A transmission cooling duct 52 for introducing outside air to the intake port 51 is connected to the front edge of the transmission cover 50.

6 is an exploded view of the transmission cooling duct 52, and FIGS. 7 and 8 are views showing the positional relationship between the transmission cooling duct 52 and the air cleaner 48. As shown in FIG.
As shown in FIG. 6, the transmission cooling duct 52 is composed of a synthetic resin body plate 52A (inner duct part) and a cover plate 52B (outer duct part) formed by molding, both of which are related. They are coupled to each other by engagement with the pawl 25 and bolt coupling. The main body plate 52A is disposed on the inner side in the vehicle body width direction, and the cover plate 52B is joined to the outer side of the main body plate 52A in the vehicle body width direction to form an air introduction path with the main body plate 52A. The transmission cooling duct 52 is fixed to the front surface of the transmission cover 50 by a pair of bolts 70 shown in FIGS. 2 and 3 in a state where the main body plate 52A and the cover plate 52B are overlapped.

  Further, the transmission cooling duct 52 has an extended portion 54 extending obliquely upward on the rear side at the upper end of a substantially semicircular root portion 53 that is superimposed on the left side surface of the transmission cover 50 on the front end portion side. An intake port 55 is provided at the tip of the extended portion 54 and opens downward. A connection port 56 that communicates with the intake port 51 of the transmission cover 50 is provided at the root portion 53 of the main body plate 52 </ b> A so that outside air sucked from the intake port 55 is introduced into the transmission cover 50 through the connection port 56. It has become. In addition, a plurality of intake guide plates 57 directed downward are provided at the intake port 55 on the distal end side of the extending portion 54. In the case of this embodiment, the intake guide plate 57 is formed integrally with the main body plate 52A, and the intake guide plates 57 are arranged in parallel to each other, and are arranged so as to be offset upward on the rear side. Further, in this transmission cooling duct 52, as shown in FIG. 8, the extended portion 54 is offset to the center side in the vehicle body width direction with respect to the root portion 53 that is superposed directly on the left side surface of the transmission cover 50. Thus, the intermediate part is formed to be curved in a substantially S shape.

  On the other hand, as shown in FIG. 5, the air cleaner 48 has a filter element 59 mounted inside a synthetic resin cleaner case 58 having a depth in the vehicle body width direction. The case main body 60 is open at one end and a shallow concave cover member 61 that closes the opening of the case main body 60. Both the case main body 60 and the cover member 61 are formed by molding, and are provided with joint flanges 60a and 61a projecting outward at the periphery of the opening where the case body 60 and the cover member 61 are attached. The case main body 60 and the cover member 61 sandwich the outer peripheral edge portion of the filter element 59 between the joining flanges 60a and 61a, and in this state, are coupled to each other by a plurality of screws 62 (see FIGS. 2, 3 and 9). Yes. In the air cleaner 48, the lower edge of the joint flange 60a of the case body 60 is fastened and fixed to the side portion of the crankcase 42 by a pair of bolts 71 as shown in FIGS.

  A substantially rectangular intake port 63 for taking outside air into the air cleaner 48 and a lower front side of the intake port 63 are formed on the lower wall of the bulging portion that protrudes outward in the vehicle body width direction from the joint flange 61 a of the cover member 61. A substantially L-shaped shielding wall 64 is provided to cover the side and part of the position directly below the intake port 63. The shielding wall 64 restricts the hot air of the engine E flowing from the front side from being directly sucked from the intake port 63.

  The case main body 60 is tapered and bulges from the joint flange 60a toward the center in the vehicle body width direction, and an intake duct 44 connected to the engine E is connected to a substantially central portion of the front wall 60b. . Further, as shown in FIGS. 4 and 5, the front wall 60 b of the case body 60 is formed to be inclined toward the rear side of the vehicle body toward the center in the vehicle body width direction. Accordingly, the air flowing from the front side of the front wall 60b is guided in the right direction of the vehicle body along the inclination of the front wall 60b.

The rear edge portion of the extension portion 54 of the transmission cooling duct 52 described above is disposed along the edge portion of the air cleaner 48 on the front side of the vehicle body as shown in FIGS. And the wall 54a inside the vehicle body width direction on the main body plate 52A side of the extending portion 54 is abutted against the vicinity of the joint flange 60a at the front edge portion of the cleaner case 58, or as shown in FIG. Closely arranged. Accordingly, the region near the joining flange 60 a at the front edge of the air cleaner case 58 is substantially covered by the extension 54 of the transmission cooling duct 52, and the inflow of air from the front side of the joining flange 60 a is caused by the transmission cooling duct 52. Will be blocked.
As shown in FIGS. 7 and 8, the air inlet 63 of the air cleaner 48 described above is disposed on the outer side in the vehicle width direction of the wall 54 a on the inner side in the vehicle width direction of the extending portion 54 of the transmission cooling duct 52.

  Further, as shown in FIGS. 7 and 8, the front edge region of the joint flange 60a of the air cleaner case 58 is slightly bent toward the center in the vehicle width direction, and the vehicle body of the transmission cooling duct 52 is formed at the tip of the bent portion. A shielding wall 65 extending forward is integrally formed along the inner wall 54a in the width direction. The shielding wall 65 is arranged in parallel with a minute gap on the center side in the vehicle body width direction of the wall 54a of the transmission cooling duct 52, and has a minute height between the shielding wall 65 and the wall 54a of the transmission cooling duct 52. A space 66 is formed.

  The space portion 66 has a labyrinth structure because the end surface of the wall 54a of the transmission cooling duct 52 is abutted against or disposed close to the front portion of the air cleaner case 58. It functions as a heat insulating layer that blocks heat transfer due to air retention. Even when there is a minute gap between the end surface of the wall 54a of the transmission cooling duct 52 and the air cleaner case 58, the space 66 and the minute gap form a labyrinth structure. The flow of air and heat in the left direction can be restricted.

FIG. 9 is a view of the installation portion of the air cleaner 48 as viewed from the outside of the vehicle (on the left side of the vehicle body). FIG. 10 shows a cross section of the case main body 60 of the air cleaner case 58 and the screwing portion of the cover member 61. .
The case main body 60 and the cover member 61 of the air cleaner case 58 are joined to each other by a plurality of screws 62, with the joining flanges 60a and 61a being overlapped as described above. The two screw fastening portions are provided with a drop-off preventing structure that prevents the screw 62 from dropping off during maintenance. As shown in FIG. 9, a work hole 75 for inserting a tool to loosen or tighten the screw 62 at the time of maintenance is provided at a substantially front position of the screw fastening portion of the left rear side cover 36. Yes.

  As shown in FIG. 10, the drop-off prevention structure is configured by an arc wall 68 that protrudes outward in the vehicle body width direction at the edge of the screw hole 67 of the joint flange 61 a of the cover member 61. The circular arc wall 68 is arranged around the screw hole 67 so as to be concentric with the screw hole 67, the root portion side is formed in a straight shape with a constant inner diameter, and the reduced diameter portion 69 whose inner diameter is constricted on the tip end side. Is provided. The inner diameter of the root portion of the arc wall 68 is set to a size that allows the axial displacement of the head portion 62a of the screw 62, and the inner diameter of the reduced diameter portion 69 is engaged with the head portion 62a of the screw 62 to be removed. It is set to a size that can be prevented. Therefore, in the cover member 61 provided with the arc wall 68, the screw 62 can be operated in the arc wall 69, but the screw 62 is prevented from dropping by the reduced diameter portion 69. However, since the arc wall 69 is not a complete annular structure but is partially separated in the circumferential direction, when the screw 62 is set in the screw hole 67, the arc wall 69 is pushed into the screw hole 67 with a little strong force. The head 62a can be inserted inside.

  In the above configuration, when the engine E of the motorcycle 1 is started and heat is generated from the cylinder portion 43, most of the heat is sucked by the cooling fan along the inside of the inlet shroud 46. It is discharged to the right side.

  Further, when the air heated by the cylinder portion 43 receives the traveling wind and flows directly to the rear side of the vehicle body, the air flows into the air cleaner 48 and the transmission cooling duct 52 at the rear side of the cylinder portion 43. However, at this time, since the transmission cooling duct 52 is installed along the front edge of the cleaner case 58 on the left side of the air cleaner 48 in the vehicle body width direction, the air flow in the left direction of the air cleaner 48 is changed. It is blocked by the machine cooling duct 52. For this reason, most of the heated air that flows rearward is discharged to the right side of the air cleaner 48 along the front wall 60B of the cleaner case 58 as indicated by the arrows in FIGS.

  On the other hand, the air inlet 48 of the air cleaner 48 is disposed on the outer side in the vehicle body width direction of the wall 54a on the inner side in the vehicle body width direction of the transmission cooling duct 52. Therefore, under normal conditions, the air heated by the cylinder part 43 Do not inhale directly. In other words, since the path connecting the cylinder portion 43 and the air inlet 48 of the air cleaner 48 is blocked by the transmission cooling duct 52, air that is not heated by the cylinder portion 43 is sucked into the air inlet 63 from below. become.

Further, even when air heated in the cylinder portion 43 due to a change in the airflow or the like sometimes gets over the transmission cooling duct 52, the arrangement structure of the air cleaner 48 in this embodiment includes the cleaner case 58 of the air cleaner 48. Since the shielding wall 64 is provided to cover from the front of the intake port 63 to a part below, the direct suction of heated air can be reduced as much as possible.
Therefore, by adopting the arrangement structure of the air cleaner 48, it is possible to suppress the suction of hot air from the engine E, thereby improving the intake charging efficiency of the engine E.

  Further, in the case of the arrangement structure of the air cleaner 48, a shielding wall 65 is provided at the front portion of the air cleaner 48 along the inner wall 54a of the transmission cooling duct 52 in the vehicle body width direction. A space 66 in which air stays is formed between the walls 54a of the duct 52. The wall 54a of the transmission cooling duct 52 and the shielding wall 65 form a labyrinth structure, and the space 66 is thermally insulated. It is possible to suppress the heat of the air heated in the cylinder portion 43 by functioning as a layer from being transmitted to the air cleaner 48 and the intake ports 55 and 63 of the transmission cooling duct 52 through the wall 54a.

  Further, in the case of the arrangement structure of the air cleaner 48, the intake port 55 of the transmission cooling duct 52 is provided on the outer side in the vehicle width direction from the hot air blocking region by the wall 54a of the transmission cooling duct 52. It can also be suppressed that the air heated in the cylinder portion 43 is directly sucked into the belt type continuously variable transmission M.

  Further, in the arrangement structure of the air cleaner 48 of this embodiment, since a plurality of intake guide plates 57 directed downward are provided at the intake port 55 of the transmission cooling duct 52, the air flows downward at the intake port 55 portion. From above. For this reason, even if a part of the air heated by the engine E goes around the upper part of the transmission cooling duct 52, the possibility that the air is sucked from the intake port 55 can be further reduced. The intake guide plate 57 can also prevent foreign matter from being sucked from the intake port 55.

  In the case of this embodiment, since the transmission cooling duct 52 has a two-part structure composed of the main body plate 52A and the cover plate 52B, the transmission cooling duct 52 can be easily formed by molding, There is an advantage that the product cost can be reduced.

  Further, in the arrangement structure of the air cleaner 48 of this embodiment, the transmission cooling duct 52 is extended to the front region of the joint flanges 60a and 61a projecting to the outermost side of the case body 60 and the cover member 61 of the air cleaner 48. Since the parts 54 are arranged along the same direction, it is possible to effectively prevent the hot air of the engine E from flowing in the direction of the air inlet 63 of the air cleaner 48 without increasing the size of the transmission cooling duct 52.

  Further, in the case of this embodiment, the front wall 60b of the case body 60 of the air cleaner 48 is inclined toward the vehicle body rear side toward the vehicle body width direction center side, and therefore flows backward from the cylinder portion 43 of the engine E to the case body. 60 can be smoothly discharged along the inclination of the front wall 60b of the case body 60 to the side opposite to the intake ports 53 and 55, which is also the air cleaner 48 or the belt type stepless. This is advantageous in suppressing the suction of hot air in the transmission M.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the intake structure according to the present invention is applied to a scooter type motorcycle. However, the applied vehicle is a motorcycle without a step floor or a three-wheel or four-wheel saddle-ride type vehicle. Also good. In the above embodiment, an air cleaner is adopted as one form of the air chamber. However, the air chamber does not necessarily have a filtering function.

42 ... Crankcase 43 ... Cylinder part 48 ... Air cleaner (air chamber)
52 ... Transmission cooling duct 52A ... Main body plate (inner duct parts)
52B ... Cover plate (outer duct part)
54a ... Wall in the vehicle body width direction 55 ... Intake port 57 ... Intake guide plate 58 ... Cleaner case (case)
60 ... Case body 60b ... Front wall 61 ... Cover member 63 ... Air intake 65 ... Shielding wall E ... Engine M ... Belt type continuously variable transmission

Claims (6)

An engine crankcase that houses the crankshaft;
A cylinder portion of an engine that protrudes forward or upward from the crankcase and in which a combustion chamber is provided;
A belt-type continuously variable transmission that extends from the side of the crankcase to the rear of the vehicle body and that shifts the driving force of the crankshaft and transmits it to the wheels;
A transmission cooling duct connected to the belt-type continuously variable transmission and for introducing cooling air into the belt-type continuously variable transmission;
In an intake structure of a saddle-ride type vehicle, comprising an air chamber disposed above the belt-type continuously variable transmission and provided in an intake system for supplying air to the cylinder portion,
The transmission cooling duct is disposed along the front portion of the air chamber on the front side of the vehicle body, and the air chamber intake port is disposed on the outer side in the vehicle body width direction than the inner wall in the vehicle body width direction of the transmission cooling duct. An intake structure for a saddle-ride type vehicle, characterized in that   The shielding wall which extends to the vehicle body front side is provided in the front part of the said air chamber so that the wall inside the vehicle width direction of the said transmission cooling duct may be provided. Intake structure for saddle-ride type vehicles.   3. The transmission cooling duct is composed of an inner duct part having an inner wall part in the vehicle body width direction and an outer duct part having an outer wall part in the vehicle body width direction. The intake structure for saddle-ride type vehicles described in 1.   The intake structure of a saddle-ride type vehicle according to any one of claims 1 to 3, wherein an intake guide plate directed downward is provided at an intake port of the transmission cooling duct. The case of the air chamber has a left and right divided structure by a case main body that opens in a vehicle body width direction and a cover member that closes the opening of the case main body, and the case main body and the cover member are molded.
The saddle riding type vehicle according to any one of claims 1 to 4, wherein the transmission cooling duct is disposed along a mating surface of the case main body and a cover member on a front side of a vehicle body. Intake structure.   6. The intake of a saddle-ride type vehicle according to claim 5, wherein the case main body bulges toward the center in the vehicle body width direction, and the front wall is inclined toward the vehicle body rear side toward the vehicle body width direction center. Construction.

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