JP2753904B2 - Exhaust system 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 exhaust system for a straddle-type vehicle.

[0002]

2. Description of the Related Art Conventionally, in an exhaust system for a saddle type vehicle, as shown in, for example, Japanese Patent Application Laid-Open No. 62-258112, a joint between an exhaust pipe and a muffler is arranged inside a rear fender or in front of a rear fender.

[0003]

[Problem to be solved] Therefore, muffler repair,
When removing the muffler for replacement, maintenance and inspection, it was necessary to first remove the rear fender, and attaching and detaching the muffler was troublesome and took extra time. Also, the connection between exhaust pipe and muffler
Some joints are located inside the frame.
The work of attaching and detaching the muffler becomes more and more troublesome.

[0004] The present invention has been made in view of such a point, and an object thereof is to provide an exhaust device in which a muffler can be easily attached and detached.

[0005]

In order to achieve the above object, the present invention has a front wheel and a pair of left and right rear wheels.
A muffler is arranged inside one of the rear wheels, and a rear fender extending left and right from the lower edge of the central seat covers the front and upper sides of the respective rear wheels. muffler and the exhaust pipe are coupled by connecting means freely separable, coupling portion of the muffler and the exhaust pipe body off
Outside the frame in the vehicle width direction and the rear fender
An exhaust device for a straddle-type vehicle disposed between the rear fender and the rear wheel in a side view behind the front wall .

[0006] The present invention relates to a saddle type vehicle for traveling on uneven terrain having a front wheel and a pair of left and right rear wheels, and a muffler disposed inside one of the rear wheels. The joint is outside the body width direction from the body frame.
On the side and behind the front wall of the rear fender in side view.
Since it is arranged between the yafender and the rear wheel, the connecting means of the connecting portion can be easily brought into contact with and separated from the side, and the work of attaching and detaching the muffler can be easily performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 9 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 rear mudguard 15 has a lower end curved outward to be substantially horizontal, and is wound around a step bar 16 projecting left and right from below, and is screwed with a bolt 16b from the front to cover the side of the step bar 16 as well. Rear mudguard
Two rectangular holes 15a are formed in the horizontal portion of each 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 is provided with a cap 61 having an oil supply port at an upper portion thereof and an extended breather tube 61a, and a concave portion 62 formed at the center of the lower rear portion.

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.

When the bracket 66a projecting from the rear left and right of the periphery of the opening of the air cleaner case 66 is fixed to the bracket 45 provided on the seat rail pipe 26 with bolts 72 to support the air cleaner case 66, the intake air protruding from the lid 67 The duct 69 is located in the recess 62 at the lower rear 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 light in weight and inexpensive, and the loss of engine output is small. Further, the opening of the intake duct 69 is in the chamber 73, and the baffle 70 can prevent intrusion of mud, water, and the like.

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.

Therefore, there is no need to remove the rear fender 11 when removing and attaching the muffler 80, and assembling, repair, replacement, maintenance, and the like are easy.

[0042]

According to the present invention, the joint between the exhaust pipe and the muffler is provided.
Outside the body frame in the vehicle width direction and at the rear fender
Between the rear fender and rear wheel in side view behind the front wall
Since it was disposed, and moving away from the connection means of the coupling portion from the side
It is easy to attach and detach the muffler, which is a problem of the saddle riding type vehicle for traveling on uneven terrain, and it is possible to easily assemble the muffler and perform maintenance management.

[Brief description of the drawings]

FIG. 1 is an overall side view of a saddle-ride type four-wheeled vehicle for traveling on uneven terrain according to one 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 front side view 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.

[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.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F01N 7/08 F01N 7/18

Claims (1)

(57) [Claims] 1. A rear fender having a front wheel and a pair of left and right rear wheels, a muffler disposed inside one rear wheel, and a left and right side fender extending from a lower end edge of a central seat in front of each of the rear wheels. And a muffler and an exhaust pipe which are connected to each other by a connecting means capable of coming and going freely, wherein a connecting portion between the muffler and the exhaust pipe is connected to a vehicle body by a vehicle body frame.
Outside the width direction and behind the front wall of the rear fender
An exhaust system for a straddle-type vehicle, wherein the exhaust system is disposed between the rear fender and a rear wheel in a side view .