JP2941521B2 - Air cleaner for straddle-type vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cleaner for a saddle type vehicle.

[0002]

2. Description of the Related Art In the case of a straddle-type vehicle having a fuel tank in front of a seat, an air cleaner device is disclosed in, for example, JP-A-63-3097.
As in No. 61 and the like, an intake duct extending from the air cleaner case extends forward below the seat over a long length and bends upward to open. This long intake duct prevents air from entering, such as mud and water, and supplies air to the air cleaner device.

[0003]

As described above, since the dedicated intake duct is used long, the cost and weight are increased, and the engine output is greatly lost.

[0004] The present invention has been made in view of such a point,
Treatment is a low cost, low <br/> clauses output losses at low weight, the influence of heat of the engine to ensure sufficient capacity and its object
There is no air cleaner device in the point.

[0005]

In order to achieve the above object, the present invention relates to a straddle-type vehicle having a fuel tank disposed in front of a seat in an engine crank having a cylinder extending forward. An air cleaner case is arranged above the case, and the upper portion of the air cleaner case is formed in a substantially triangular shape in a side view by an upper wall inclined downward and backward,
A concave portion formed at the lower rear portion of the fuel tank and a concave portion formed at the lower front portion of the seat form a common inner space, and a substantially triangular upper portion of the air cleaner case is inserted into the inner space. An air intake duct protruding forward from the upper portion of the air cleaner case is opened facing a recess of the fuel tank, and a baffle plate covering a lower portion of the air intake duct is provided integrally with the air cleaner case to form a recess in the fuel tank. Is an air cleaner device for a straddle-type vehicle having an intake chamber.

The upper portion of the air cleaner case is inserted into an inner space defined by a concave portion at the lower rear portion of the fuel tank and a concave portion at the lower front portion of the seat. A chamber is formed, and the intake duct protruding forward from the top of the air cleaner is open facing the recess of the fuel tank, so the baffle plate prevents intrusion of mud, water, etc., and it is necessary to use a special long duct In addition, low cost, low weight, and reduction in engine output loss can be achieved. In addition, since the upper part of the air cleaner case is inserted into the inner space and the intake duct faces the intake chamber at the front, the upper part of the air cleaner case is expanded upward while forming the intake chamber to reduce the capacity of the air cleaner case. While ensuring enough, the amount of downward protrusion of the air cleaner case can be kept small, an appropriate space can be formed between the air cleaner case and the engine, and the influence of the heat of the engine can be suppressed. I can do it. Since the engine below the air cleaner case has a cylinder extending forward, there is a degree of freedom in the arrangement of the air cleaner case in the front-rear direction, and the upper part of the air cleaner case is located in the inner space at the connection between the fuel tank and the seat. It can be easily arranged to be located.

[0007]

[Embodiment] An embodiment of the present invention shown in FIGS. 1 to 10 will be described below.

The present embodiment relates to a saddle-ride type automobile 1 for traveling on uneven terrain. FIG. 2 shows an overall side view of the automobile, and FIG. 3 shows a plan view of the same.

A pair of left and right front wheels 3 projecting right and left before and after the body frame 2 located at the center in the width direction.
And a rear wheel 4. A steering column 5 which is inclined with its lower end forward extends vertically through the front part of the body frame 2, and a bar handle 6 is provided extending from the upper end of the steering column 5 right and left.

A side cover 7 covers the left and right side surfaces of the upper front half of the body frame 2, and a front fender 8 extends leftward and rightward from the lower edge of the side cover 7 to above the front wheel 3. The left and right side covers 7 have their front portions wrapped around the front of the steering column 5 and are joined at the center, and the front cover 10 covers the upper portion of the joint. An opening 7a for venting air is formed near the front fender 8 of the side cover 7.

A handle cover 14 covers from the upper end of the steering column 5 to the bar handle 6. The upper rear portions of the left and right side covers 7 are turned upward and joined at the center, and a seat 9 is disposed behind the upper portions. Rear fenders 11 project leftward and rightward from the lower edges of the left and right sides of the seat 9 to cover the upper portion of the rear wheel 4, and the rear fenders 11 extend around the rear of the seat 9 and are integrally formed on the left and right sides.

The inner edges of the left and right rear fenders 11 extend forward below the side portions of the seat 9 and are flush with the side cover 7, and are joined to the lower end of the extension 11a and the curved lower end of the rear fender 11. The rear mudguard 15 is provided below. The lower end of the rear mudguard 15 is bent outward to be substantially horizontal, and is wound around a step bar 16 projecting left and right from below, and is screwed from the front with a bolt 16b to cover the side of the step bar 16. Two rectangular holes 15a are formed in a horizontal portion of the rear mud guard 15, and a concave portion is formed behind the rectangular holes 15a.

Here, the structure of the vehicle body frame 2 will be described with reference to FIGS. At the front of the body frame 2, a pair of left and right front pipes 20 are arranged to be inclined forward and backward,
The front lower pipe 19 extends substantially horizontally rearward from the lower ends of the left and right front pipes 20, respectively, the front lower pipe 19 curves inward from the middle, the lower pipe 21 extends rearward from the outer surface of the curved portion, and the lower pipe 21 extends, It is bent upward at the rear end to form a center pipe 22. The lower pipe 21 and the center pipe 22 are one continuous one. A cross pipe 23 is provided connecting the upper ends of the left and right center pipes 22.

Main pipes 24 are provided in a straight line between the upper end of the front pipe 20 and the center of the center pipe 22, respectively. Also left and right front pipe
A front side pipe 25 that extends diagonally downward from the center of the rear to the rear is erected between the lower pipe 21 and the front side pipe 25,
A triangle having three sides including the front pipe 20, the lower pipe 21 (partially the front lower pipe 19), and the front side pipe 25 is formed.

The front end is welded to the center of the main pipe 24, and the seat rail pipe 26 extends straight and rearward through both ends of the cross pipe 23 at the upper end of the center pipe 22. It is arranged.
Note that the seat rail pipes 26 form a left-right pair and have a rear end connected to one. A reinforcing pipe 28 connects and reinforces a seat rail pipe 26 extending rearward from the center pipe 22 and a lower portion of the center pipe 22.

A reinforcing pipe 27 having both ends welded to the upper part of the front side pipe 25 and the center part of the main pipe 24 and connecting the both is provided on the same straight line as the seat rail pipe 26.

The above frame pipes 19, 20, 21, 22,
24, 25, 26, 27, 28 are each paired on the left and right.

A cross plate 29 having a U-shaped cross section is provided between the left and right front pipes 20 at a connection portion with the front side pipe 25. The left and right ends of the cross plate 29 protrude outward from the left and right front pipes 20 to be described later. The upper end mounting portion 29a is formed. Cross plate
A part of the lower end of the rear wall and the front wall 29 is partially cut out and welded to the cross plate 29, and the lower end of the outer side of the notch of the rear wall is bent along the front side pipe 25 to form the front side pipe 25. Welded to. Further, a cross stay 30 is provided between the upper portions of the front pipes 20, and a cross plate 31 is erected to project forward immediately below the front stays 20.
A bumper mounting bracket 18 is erected at the lower part of the vehicle.

A cross plate 32 is provided between the left and right lower pipes 21 in front of the lower end of the front side pipe 25, and cross pipes 33, 34, 35 are sequentially provided in the rear. Bearings 37 and 38 for pivotally supporting the front wheel supporting arm members 54 and 55 are provided before and after the steering lower holder 36, and an engine supporting plate 47 is provided between the cross pipes 34 and 35. The rear half curved to the inside of the front lower pipe 19 is a cross pipe 33.
The rear end is welded. At the left and right sides of the cross pipe 34, mounting brackets 16a of the step bar 16 are provided to protrude.

Between the left and right seat rail pipes 26, in addition to the cross pipe 23, a cross plate 39 is provided at the rear.

The vehicle body frame 2 is constructed as described above. The reinforcing pipe 27 and the seat rail pipe intersect with the main pipe 24 from the triangular high rigid front portion consisting of the front pipe 20, the lower pipe 21, and the front side pipe 25.
26 penetrates straight to the rear to enhance the rigidity of the entire body frame 2.

In the center pipe 22, a main pipe
A bracket 40 for pivoting the rear fork is provided from the joint with the lower end 24 to the bent portion at the lower end, and a bracket 42 is vertically suspended from the main pipe 24 via a bracket 41 for engine suspension and a cross pipe 95. .

A bracket 43 for supporting the upper end of the rear cushion 52 is provided at the center of the cross pipe 23. A bracket 44 for supporting the fuel tank is provided on the main pipe 24 before the joint with the seat rail pipe 26. Brackets 45 for supporting the air cleaner case are provided on the left and right sides of the seat rail pipe 26 behind the joint. And on the right reinforcement pipe 28 is a bracket for supporting the muffler
46 is projected diagonally downward. In addition, a bumper pipe 96 is projected from the tip of the front lower pipe 19 so as to be bent obliquely upward and forward.

In the body frame 2 as described above, the engine 12 is arranged on the plate 47 between the main pipe 24 and the lower pipe 21 and is fixed by bolts from below, and the flange bolts 48 and Fixedly supported by 49. The engine 12 has a recoil knob 12a on the left side.

The front end of the rear fork 13 is supported on the bracket 40 by a pivot 50 so that the rear wheel 4 supported by the rear end of the rear fork 13 can swing up and down. A rear cushion 52 is interposed between the projecting bracket 51 and the bracket 43 provided on the cross pipe 23.

A chain 53 is provided between a sprocket fitted on the output shaft 53 of the engine 12 and a sprocket provided on the axle of the rear wheel 4 to transmit power.

On the other hand, arm members 54 and 55 project from the bearings 37 and 38 provided on the front cross plate 32 to the left and right, with the base ends pivotally supported, and the arm members 54 and 55 swing vertically. Are joined together to support the axle of the front wheel 3. The tip joint of the left and right arm members 54 and 55 and the cross plate
Left and right front cushions 56 are interposed between the mounting portion 29a protruding left and right of the 29.

The reinforcing pipe 27 which passes through the vehicle body back and forth in a straight line in the vicinity of the cross plate 29 to which the upper end of the front cushion 56 is pivotally connected and the cross pipe 23 to which the upper end of the rear cushion 52 is pivotally connected, and a seat rail. The pipe 26 is connected so that the front cushion 56 and the rear cushion 52 can cancel each other out of the load in the vehicle longitudinal direction via the reinforcing pipe 27 and the seat rail pipe 26.

The steering column 5 includes a cross stay 30
Of the steering column 5 extending obliquely downward, the upper end of which is fixed by a steering upper holder 90 attached to the cross stay 30, and the lower end of the steering column 5 It is fixed to the lower holder 36.

The rotation of the steering shaft is transmitted to the left and right tie rods 93 via the center arm 92.
The tie rod 93 changes the steering angle of the front wheel 3.

A fuel tank 60 is disposed above the front half of the main pipe 24, and a bracket 60 a projecting from the front of the fuel tank 60 is provided with a cross stay 30 at the upper end of the front pipe 20.
The fuel tank 60 is supported by fixing the left and right sides of the lower surface of the fuel tank 60 to the bracket 44 provided on the main pipe 24.

The fuel tank 60 has a cap 61 having a fuel filler port at an upper part thereof and an extended breather tube 61a.
And a concave portion 62 is formed in the center of the lower rear , and the sheet is
The inner space is formed together with the front lower recessed portion 9 .

An air cleaner device 65 is disposed obliquely below and behind the fuel tank 60. The air cleaner device 65 has a lid 67 placed over an upper opening of an air cleaner case 66, pressed by a set spring 77, and has an element 68 incorporated therein. An extremely short intake duct 69 projects forward from the lid 67.

[0034] When fixing the bracket 66a projecting from the rear left and right periphery of the opening of the air cleaner case 66 by a bolt 72 to a bracket 45 provided on the seat rail pipe 26 for supporting the air cleaner case 66, Eakuri
The lid 67 on the upper part of the na case 66 is
The intake duct 69 that is inserted into the lower internal space between the fuel tank 60 and the seat 9 and protrudes from the lid 67 is present in the recess 62 at the rear lower part of the fuel tank 60.

A baffle plate 70 protrudes forward from the front of the periphery of the opening of the air cleaner case 66.
Partition the recess 62 of the fuel tank 60 to form a chamber 73, in which an intake duct 69 is disposed with an open front.

Since the intake duct 69 is extremely short, it is lightweight, inexpensive, and has little loss of engine output. The opening of the intake duct 69 is in the chamber 73, and the baffle 70 can prevent the intrusion of mud, water, and the like. Sa
Further, the upper lid 67 of the air cleaner case 66 is
Since it is inserted into the space, the air cleaner case 66
With the capacity secured and the air cleaner case 66
The amount of protrusion can be reduced, and the distance between the lower engine 12
A suitable space to reduce the effect of heat from the engine 12
And the design layout can be improved.

From the front of the air cleaner case 66, a duct 75 connected to the clean side of the element 68 extends and is connected to the carburetor 76.
And is connected to the intake port of the engine 12. A battery 78 is provided behind the air cleaner device 65 and supported by a support stay 78a.

On the other hand, the exhaust device muffler 80 has a cylindrical shape, and a mounting bracket 79 is provided on the left side thereof so as to protrude therefrom.
The muffler 80 is applied to the right reinforcing pipe 28 from the outside, and a mounting bracket 79 is superimposed on the bracket 46 of the reinforcing pipe 28 and screwed and supported by bolts 82. The muffler 80 thus supported is located behind the center pipe 22 inside the right rear wheel 4.

The exhaust pipe 81 extends downward from the lower surface of the cylinder head 12a facing the front of the engine 12, immediately curves rightward and upwards, and the right seat rail pipe 26
At the intersection with the main pipe 24 at the front end thereof, it bends rearward, extends along the left seat rail pipe 26, and is supported by a bracket provided on the main pipe 24 on the way to the rear, and gradually to the right. It is biased and connected to the muffler 80.

The introduction pipe 83 slightly projecting from the front wall of the muffler 80 is fitted through a gasket into a connection pipe 84 attached to the rear end of the exhaust pipe 81, and a fastening band 86 is inserted into the connection pipe 84 from outside. It is wound and its ends are tightened and connected by bolts 87. This joint is located behind a wall that covers the front of the rear wheel 4 of the right rear fender 11.

As described above, various devices are mounted on the body frame. Among them, the air cleaner device 65 is located above the engine 12, and the intake duct 69 faces the concave portion 62 at the lower rear of the fuel tank 60 and is divided into baffle plates 70. Since the inside of the chamber 73 is provided, intrusion of mud, water, and the like can be prevented, and the intake duct 69 can be shortened, lightened, reduced in cost, and can reduce the loss of engine output.

[0042]

According to the present invention, the intake duct is made shorter by lowering the intake duct by making the intake duct face a chamber formed by a baffle plate integrated with the recess of the fuel tank and the air cleaner case, thereby reducing the cost, the weight, and the loss of engine output. Reduction can be achieved. The recess at the lower rear of the fuel tank and the recess at the lower front of the seat
Part of the air cleaner case
Since it is inserted, the capacity of the air cleaner case
While protruding downward from the air cleaner case.
Can keep the space between the engine and
And can suppress the effects of engine heat.
In both cases, the design layout can be improved.

[Brief description of the drawings]

FIG. 1 is an overall side view of a saddle-ride type automobile for traveling on uneven terrain according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an overall side view in which a vehicle body cover and other parts are omitted.

FIG. 4 is a perspective view showing a vehicle body frame structure.

FIG. 5 is a side view showing a front portion of the vehicle body frame structure.

FIG. 6 is a front view of the vehicle body frame structure.

FIG. 7 is a partial plan view of the vehicle body frame structure.

FIG. 8 is a side view of a main part partially omitted.

FIG. 9 is a plan view of the main part.

FIG. 10 is an XX end view in FIG. 8;

[Explanation of symbols]

1: Saddle-type four-wheeled vehicle, 2: Body frame, 3: Front wheel,
4: Rear wheel, 5: Steering column, 6: Bar handle, 7: Side cover, 8: Front fender, 9: Seat, 10: Front cover, 11: Rear fender, 12: Engine, 13: Rear fork, 14: Handle Cover, 15…
Rear mud cover, 16… Step bar, 18… Bumper mounting bracket, 19… Front lower pipe, 20… Front pipe, 21… Lower pipe, 22… Center pipe, 23…
Cross pipe, 24 ... Main pipe, 25 ... Front side pipe, 26 ... Seat rail pipe, 27, 28 ... Reinforcement pipe, 29 ... Cross plate, 30 ... Cross stay, 31, 32 ...
Cross plate, 33, 34, 35 Cross pipe, 36 Lower steering holder, Bearing 37, 38 Bearing, 39 Cross plate, 40, 41, 42, 43, 44, 45, 46 Bracket
47 ... plate, 48, 49 ... flange bolt, 50 ... pivot, 51
... Bracket, 52 ... Rear cushion, 53 ... Chain, 5
4, 55 ... arm member, 56 ... front cushion, 60 ... fuel tank, 61 ... cap, 62 ... recess, 63 ... bolt, 65 ... air cleaner device, 66 ... air cleaner case, 67 ... lid,
68… Element, 69… Intake duct, 70… Baffle plate, 71… Set spring, 72… Bolt, 73… Chamber, 75… Duct, 76… Carburetor, 77… Intake pipe, 78… Battery,
79… Mounting bracket, 80… Muffler, 81… Exhaust pipe, 83…
Inlet pipe, 84… Connection pipe, 86… Tightening band, 87… Bolt, 90
... Steering upper holder, 92 ... Center arm, 93 ... Tie rod, 95 ... Cross pipe, 96 ... Bumper pipe.

Claims (1)

(57) [Claims] 1. A straddle-type vehicle having a fuel tank disposed in front of a seat, wherein an air cleaner case is disposed above a crankcase of an engine having a cylinder extending forward, and an upper part of the air cleaner case is lowered rearward. The upper wall which is inclined to be substantially triangular in side view, the concave portion formed in the lower rear portion of the fuel tank and the concave portion formed in the lower front portion of the seat form a common inner space, and the substantially triangular shape of the air cleaner case. The upper part of the interior
Inserted between the said intake duct protruding from the top of the air cleaner case forward, the fuel tank so as to face in a recess in the opening, provided with a baffle plate for covering the lower side of the intake duct together with the air cleaner case An air cleaner device for a saddle-ride type vehicle, wherein a concave portion of a fuel tank is an intake chamber.