JPH09203355A - Motorcycle air cleaner device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an air cleaner device for a motorcycle capable of preventing water from entering without increasing the number of parts. SOLUTION: In an air cleaner device for a motorcycle, in which a rail bracket 6 is connected to a rear end portion of a main frame 4 extending from a head pipe to the rear of the vehicle body, an upper side of a connecting portion between the rear end portion of the main frame 4 and the rail bracket 6. Gusset 7 (reinforcing plate) surrounding the connection part
Is fixed, and the space formed by the gusset 7, the rear end of the main frame 4 and the rail bracket 6 is used as an air introducing chamber A, and an air cleaner case 8 is provided on the left side of the air introducing chamber A.
0 is fixed, and the intake port 86a of the air cleaner case 80 is fixed.
Is opened in the air introduction chamber A.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air cleaner device for a motorcycle.

[0002]

2. Description of the Related Art In a motorcycle, an air cleaner device is provided for filtering combustion air supplied to an engine. In this type of air cleaner device, conventionally, an air cleaner case is generally arranged in a side cover that covers a lower side of a seat and fixed to a vehicle body frame, and an air intake duct of the air cleaner is opened in the side cover.

[0003]

However, in the structure in which the intake duct is opened in the side cover as in the above-mentioned conventional device, there is a problem that splashing water or the like easily enters the intake duct and adheres to the element. In order to prevent the invasion of water, it is conceivable to dispose a water entry prevention plate or the like at the opening portion of the intake duct, but in such a case, there is a problem that the number of parts increases.

The present invention has been made in view of the above conventional circumstances, and an object thereof is to provide an air cleaner device for a motorcycle capable of preventing water from entering without increasing the number of parts.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to an air cleaner device for a motorcycle including a vehicle body frame having a rail bracket for supporting a seat rail connected to a rear end portion of a main frame extending from a head pipe to the rear of the vehicle body.
A reinforcing plate is fixed to a connecting portion between the rear end portion of the main frame and the rail bracket so as to surround the connecting portion from above, and a space surrounded by the reinforcing plate, the rear end portion of the main frame and the rail bracket is formed. An air introduction chamber is provided, and an air cleaner case is arranged on either the left side or the right side of the air introduction chamber, and an intake port of the air cleaner case is opened in the air introduction chamber.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 16 are views for explaining an air cleaner device for a motorcycle according to an embodiment of the present invention. FIG. 1 is a left side view of the motorcycle,
2 is a left side view of the vehicle body frame, FIG. 3 is a cross sectional left side view of the engine, and FIGS. 4 to 6 are plan views, front sectional views, and side sectional views of the cylinder head, and FIGS. 9 and 10 are sectional views showing the mold of the cylinder body, FIG. 11 is a perspective view of the mold, and FIGS. 12 and 13 are sectional plan views, side views, FIG. 14 and FIG. 15 is a sectional rear view of the kick starter,
FIG. 16 is a side view, and FIG. 16 is a view showing a suction cover of the air cleaner device, and FIGS. It is the dd line sectional view and the ee line sectional view. In addition, the left and right and the front and rear in the present embodiment mean the left and right and the front and rear in a state of sitting on the seat.

In the figure, reference numeral 1 is a motorcycle, and a vehicle body frame 2 thereof has a head pipe 3 to which a front end of a main frame 4 extending obliquely downward and rearward of the vehicle body is connected. A rail bracket 6 having a U-shaped cross section extending obliquely upward is connected to the end, and a gusset having a reverse U-shape cross section is provided so as to surround the connection portion, that is, the upper portion of the rail bracket 6 and the rear end of the main frame 4. 7 (reinforcement plate) is connected, and a pair of left and right seat rails 5 extending obliquely upward and rearward of the vehicle body are connected to the upper ends of the gusset 7 and the rail bracket 6 respectively.

A backstay 8 is installed between the seat rails 5 and the rail brackets 6,
A seat tube 9 is erected on the upper surface of the gusset 7. A support bracket 10 is connected to the lower side of the center of the main frame 4, and a suspension bracket 11 extending downward is connected to the rear end of the main frame 4.
The engine 12 is supported by 0 and 11.

The seat tube 9 includes a front seat 13
The front end portion of a seat 13 formed by integrally forming a and a rear seat 13b is pivotally supported, and an oil tank 14, a battery 15, and a fuel tank 16 are disposed below the seat 13, respectively.

A front fork 20 is pivotally supported on the head pipe 3, a front wheel 21 is attached to the lower end of the front fork 20, and a steering handle 22 is attached to the upper end. The suspension bracket 11 has a pivot shaft 2
A rear arm 24 is pivotally supported via a shaft 3 so as to be vertically swingable, and a rear wheel 25 is attached to a rear end of the rear arm 24. A rear cushion 27 is installed between the rear arm 24 and the rail bracket 6.

A cowling 31 to which a headlight 30 is attached is arranged at the front of the head pipe 3.
A steering handle 22 is arranged above. An engine 12 extends downward on the left and right sides of the main frame 4.
An under cover 33 that surrounds the side cover 3 and a side cover 34 are provided on the lower surface of the seat 13.
A tail light 35 is attached to the rear end of the No. 4.

The engine 12 is, as shown in FIG.
This is an air-cooled two-cycle engine mounted on the body frame 2 with the axis of the cylinder bore 37d (cylinder axis) tilted forward by about 35 degrees. This is a cylinder body 37 mounted on the upper mating surface of the left and right two-split crankcase 36. The cylinder head 38 is laminated on the upper mating surface of the cylinder body 37 and fastened with head bolts, and the piston 39 is slidably inserted into the cylinder bore 37d of the cylinder body 37. The connecting rod 40 is connected to the crankpin 42 of the crankshaft 41. The combustion recess 3 is formed on the lower surface of the cylinder head 38.
8a is provided as a recess, and the spark plug 4 is provided in the recess 38a.
The second electrode is exposed.

The inside of the crankcase 36 is divided by a partition wall 36c into a crank chamber 36a for accommodating the crankshaft 41 and a shift chamber 36b for accommodating the transmission mechanism 43. The speed change mechanism 43 rotates the crankshaft 41 to the rear wheel 25 via a centrifugal auto clutch (not shown) mounted on the right end thereof, a main shaft 43a, a drive shaft 43b, and a sprocket and a chain (not shown). It is designed to communicate. Reference numeral 47 in FIG. 1 is a chain cover.

A balancer shaft 45 is disposed below the crank shaft 41 in parallel therewith, and a starter motor 46 is provided at the front portion of the front wall 36d of the crank case 36 so that its drive shaft 46a is placed on the left side of the vehicle body. It is arranged toward and parallel to the crankshaft 41. Although not shown, a centrifugal auto clutch is mounted on the right end side of the crankshaft 41.

On the outer peripheral wall of the cylinder body 37, a plurality of heat-dissipating cooling fins 50 standing upright in the direction perpendicular to the cylinder axis are integrally formed at intervals in the cylinder axis direction. The ribs 50a at the center in the width direction are integrally connected. In addition, a plurality of scavenging ports 51 are formed on the cylinder wall of the cylinder body 37 to connect the crank chamber 36a and the inside of the cylinder bore 37d. Further, the lower mating surface 37b of the cylinder body 37, which is connected to the crankcase 36, is provided with a lightening recess 37a for weight reduction as shown in FIGS.

Next, the cylinder head 3 in this embodiment
The vibration isolation structure of No. 8 will be described. The cylinder head 3
As shown in FIGS. 4 to 6, a large number of cooling fins standing upright in the cylinder axis direction and extending in the vehicle traveling direction are integrally formed on the upper wall of the vehicle 8 at intervals in the vehicle width direction. Outer fins 52a, 52a located on the left and right outermost sides in the thickness direction (vehicle width direction) of the cooling fins have a top surface height except for the front end portion 52b 'of each inner fin 52b located on the inner side. It is higher than the top height of. The height of the top surface of the front end portion 52b 'of each inner fin 52b is the same as that of the outer fin 52a. That is, each inner fin 52b is formed in a stepped shape. A head cover 54 made of a metal plate is provided on the top surface of the stepped-down portion of each inner fin 52b via an elastic sheet 53 made of a rubber plate.
Is arranged, and the upper surface of the head cover 54 and the top surfaces of the outer fin 52a and the front end portion 52b 'are flush with each other. The head cover 54 has bolts 57 attached to boss portions 38d formed integrally at the four corners of the cylinder head 38.
It is fixed by screwing together. Further, the stud bolt hole 38b and the ignition plug hole 38c of the elastic sheet 53 are formed.
A hole 53a is formed in a portion corresponding to.

The left and right outer fins 52a and the fin 5
2a adjacent to the inner fin 52b in the longitudinal direction,
And the central portion are integrally connected by a rib 60. The ribs 60 of the adjacent inner fins 52b are also provided.
A notch 61 is formed in the portion to which is connected.
The notch 61 is an opening that opens the space a formed by the fins 52a and 52b and the rib 60 outward in the vehicle-mounted state low part, whereby muddy water or the like that has entered the space a. A discharge passage is formed.

Of the inner fins 52b, each fin 52b located in the center of the vehicle width direction is formed with a recessed recess 62 having a semicircular shape in plan view, which is formed by cutting out a rear edge, and the main recessed recess 62 is formed in the recessed recess 62. The lower edge of the frame 4 is located. By forming the escape recesses 62, the cylinder head 38 can be attached and detached with the engine mounted on the vehicle body without changing the size and shape of the main frame 4 or the inclination angle of the engine 12. That is, in order to make the cylinder head removable when the engine is mounted on the vehicle, it is conceivable to increase the forward tilt angle of the engine or change the frame position upward, but if this is done, it may interfere with the front fender, There is a problem that the degree of freedom of the frame shape becomes low. Further, since the concave portion 62 is on the opposite side of the exhaust port, which will be described later, it has almost no effect on the cooling performance, and since only a part of the inner fin 52b is cut out, the contact area of the elastic sheet 53 is extremely reduced. It is possible to avoid the impact on anti-vibration measures.

On the front wall of the cylinder body 37, an exhaust port 65 communicating with the cylinder bore 37d is formed obliquely downward. Further, an annular convex flange portion 66 is formed on the periphery of the external connection opening of the exhaust port 65,
The convex flange portion 66 is formed so as to be recessed in the direction of arrow a in FIG. 7 so as to be close to the center of the cylinder bore. This reduces the volume around the exhaust port 65 and suppresses the amount of heat stored by the exhaust gas. In addition, since the convex flange portion 66 is recessed, the bending radius of the exhaust pipe 67 can be increased, and the bending process of the exhaust pipe 67 can be easily performed. Is smaller, and the problem of interference with the front wheels is less likely to occur.
On the other hand, since the convex flange portion 66 is recessed, the lower half portion 66b of the flange portion 66 has a bolt boss portion 37c for fixing the cylinder body 37 to the crankcase 36, as shown in FIG. It is located on the center side of the cylinder bore, so that the shape of the casting mold is restricted as described later.

A flange portion 67b of the exhaust pipe 67 is bolted and fixed to the convex flange portion 66 with a gasket (not shown) interposed. The exhaust pipe 67 extends downward from the cylinder body 37 to the right side of the vehicle body and extends rearward from the right side of the vehicle body. The silencer 67a is provided at the rear end of the exhaust pipe 67.
Is connected.

Next, the mold of the cylinder body 37 in this embodiment will be described. Cylinder body 37
Is manufactured by the mold 70 shown in FIGS. 9 to 11. That is, the mold 70 comprises a pair of left and right mother dies 71 and 72 for forming the main part of the cylinder body 37.
And the exhaust port 6 in cooperation with the mother molds 71 and 72.
5, and the exhaust core 73 forming the upper half portion 66a of the convex flange portion 66 located on the cylinder head side, the hollowed-out concave portion 37a of the lower mating surface 37b of the cylinder body 37, and the convex flange portion 66. It includes a lightening die 74 that forms a lower half portion 66b located on the crankcase side.

The exhaust core 73 has a generally conical port portion 73a forming the exhaust port 65, and a cylindrical portion 73 forming the peripheral edge of the port opening and the inner peripheral surface of the convex flange portion 66.
b, and the cylindrical portion 73b and the left and right mother molds 71,
The upper half portion 66a of the convex flange portion 66 is formed by the arcuate cutout concave portions 71a, 72a formed in 72. Further, the core 73 is formed on the tip surface of the pad portion 73a during casting.
A support portion 73c for positioning and supporting is formed to project.

The above-mentioned lightening die 74 has a cylinder body 37.
The base portion 74a forming a part of the lower mating surface 37b and the boss portion 37c and the support portion 74c for supporting the cylindrical portion 73b of the core 73 are integrally formed. A pair of convex portions 74b forming the lightening concave portion 37a are projected on the upper portion, and a lower half portion forming a lower half portion 66b of the convex flange portion 66 with the column portion 73b on the peripheral edge of the support portion 74c. The mold part 74d is recessed.

After the molten metal is cast into the mold 70, the cylinder body 37 is divided into left and right mother molds 71 and 72 into right and left molds, and an exhaust core 73 is punched rearward in the axial direction of the port to form a meat. It is manufactured by punching the punching die 74 downward in the axial direction of the cylinder bore.

An intake opening 36e communicating with the crank chamber 36a is formed in the upper rear wall of the crankcase 36, and a reed valve 75 is inserted in the opening 36e. The reed valve 75 is of a single-open type having only a valve plate that opens upward. When the piston 39 rises, the crank chamber 36a becomes negative in pressure and air is automatically introduced, and when the piston 39 descends, it becomes positive and closes. To prevent blowback of air. In addition, the intake opening 3
A vaporizer 76 is connected to the upstream side of the 6d reed valve 75, and an air cleaner device 68 is connected to the upstream side of the vaporizer 76.

Next, the air cleaner device 68 will be described. The air cleaner device 68 is shown in FIGS.
As shown in FIG. 3, an air introduction chamber A is formed by the connecting portion of the above-mentioned may frame 4 and rail bracket 6 and the gusset 7 surrounding the portion, and a resin air cleaner case 80 is provided on the left side portion of the gusset 7. It is arranged and configured. When the main frame 4 and the gusset 7 are welded at the bottom of the air introducing chamber A, a gap is provided by not intentionally welding a part of the gap to drain water. When rainwater or the like intrudes into the water, it is designed to drop downward from the drainage portion and discharge it.

The air cleaner case 80 is a left and right two-part type consisting of a case body 81 and a case cover 82. The case body 81 has flanges 81a and 81b formed on its outer wall so as to project therefrom. Body frame 2
It is fixed by bolting to.

An element 83 for partitioning the case main body 81 and the case cover 82 is provided at a mating portion of the case main body 81 and the case cover 82, and the element 83 is engaged integrally with the peripheral edges of the case main body 81 and the case cover 82. It is pinched and fixed by the protrusion 84. Further, the case cover 82 is
The integrally formed boss portion 82a is coaxially engaged with the boss portion 81c of the case body 81, and the bolt 85 is screwed into the case body 81 so that the boss portion 82a is detachably attached to the case body 81. As a result, the element 83 can be replaced by simply removing the case cover 82.

A cylindrical intake duct portion 86 extending in the vehicle width direction is integrally formed in the case main body 81, and the upstream side intake port 86a of the intake duct portion 86 is formed in the case main body 8.
It projects outward from 1. In addition, the intake duct portion 86
The downstream side intake port 86b penetrates the element 83 and opens in the case cover 82. A discharge port 81d is formed on the front wall of the case body 81.
The upstream end of the carburetor 76 is connected to d via an intake pipe 87.

The gusset 7 is formed with an intake air inlet 7a at the left rear portion and an air intake opening 7b at the right front portion, and the upstream inlet 86a of the intake duct 86 is the intake inlet 7a. There is an opening in the air introduction chamber A through the. Further, the gusset 7 is provided with a suction bowl 26 having a substantially bowl shape surrounding the opening 7b.
It is fastened and fixed by bolts inserted through f and 26g, thereby preventing rainwater and the like from entering the opening 7b. The suction cover 26 has suction ports 26a to 26
d is formed, which prevents the rainwater from entering and sufficiently secures the suction port area to reduce the suction resistance. A cover mounting boss 26e is formed at the tip end portion of the suction cover 26 in the vehicle width direction.
The side cover 34 is bolted and fixed to e.

In this way, the air sucked from the air opening 7b through the suction ports 26a to 26d of the suction cover 26 is introduced from the air introduction chamber A through the intake duct 86 into the case cover 82, Element 8 from here
It is filtered by 3 and enters the case main body 81, and the discharge port 81d
Is supplied to the carburetor 76 (see → mark in FIG. 12).

Next, the neutral kick starter of this embodiment will be described with reference to FIGS. 14 and 15. In the present neutral kick starter, when the kick arm 91 disposed on the right side of the engine 12 is stepped on, the kick shaft 90 rotates, and the ratchet 92 moves axially rightward in accordance with the rotation to cause the kick gear 93 to move. The crankshaft 41 is configured to rotate via the first speed gear 94 when the kick gear 93 is engaged. Note that the first speed gear 94 is rotatable on the drive shaft 43b in a state where a shift dog (not shown) is not engaged.

The crankcase 36 is divided into left and right cases (first and second cases) 95a and 95b, and a case cover 95c is detachably attached to the right case 95b. The left end of the kick shaft 90 is the left case 95.
By a, the central portion is pivotally supported by the right case 95b, and the right end portion is pivotally supported by the case cover 95c. A stopper 96 is fixed to the inside of the left case 95a of the kick shaft 90 by caulking. The stopper 96 comes into contact with a case-side stopper portion (not shown) to regulate the positioning of the return position (pre-rotation position) of the kick shaft 90 before the depression. The kick gear 93 is relatively rotatably mounted inside the right case 95b of the kick shaft 90, and the kick gear 93 is held by a circlip 97a and a stopper plate 97b so as to be immovable in the axial direction.

Between the right case 95b and the case cover 95c of the kick shaft 90, a return spring 98 for constantly urging the kick shaft 90 in the counter-depression direction, that is, toward the return position is mounted. One end 98a of the return spring 98 is locked to the right case 95b and the other end 98b is locked to the kick shaft 90. Further, a collar 99 is provided between the right case 95b and the case cover 95c of the kick shaft 90.

The ratchet 92 disposed between the stopper 96 of the kick shaft 90 and the kick gear 93 meshes with the twist spline 90a formed on the kick shaft 90, and the ratchet 92 has a predetermined torque. Up to a ratchet 92 is mounted on the ratchet 92.
The other end is locked to the left case 95a.

The stopper 96 and the ratchet 9 are provided.
2. The kick gear 93 may be symmetrically arranged with respect to FIG. 14, that is, the stopper 96, the ratchet 92, and the kick gear 93 may be arranged in order from right to left in the drawing.

The operation of the ratchet 92 will be described below. A ratchet 92 along with the rotation of the kick shaft 90
When a rotational force is applied to the ratchet 92,
Since it is held by No. 00, it does not rotate, and therefore the twisting spline 90a receives the driving force in the axial direction of the kick shaft 90 and moves to the kick gear 93 side. And ratchet 92
When the dog 92a is engaged with the dog 93b of the kick gear 93, the rotation of the kick shaft 90 is transmitted to the kick gear 93 via the ratchet 92, and the kick gear 93 rotates the crankshaft 41 via the first speed gear 94. Become.

Next, the function and effect of this embodiment will be described. According to the cylinder head anti-vibration structure of the present embodiment,
The top height of the left and right outer fins 52a is set to the inner fin 52b.
The height of the head cover 54 is made higher than the top surface of the inner fin 52b by interposing an elastic sheet 53 on the top surface of the inner fin 52b.
Since it is fastened and fixed together by 7, it is possible to prevent fin squeal due to vibration of the fin. In this case, the end faces of the elastic sheet 53 and the head cover 54 are covered with the outer fins 52a and are not visible from the side, and the appearance from the side can be improved. Further, the number of parts can be reduced and the cost can be reduced as compared with the conventional case where the elastic member is pushed between the fins.

Since the left and right outer fins 52a and the adjacent inner fins 52b are integrally connected by the ribs 60, the rigidity of the left and right outer fins 52a can be increased, and the outer fins 52a can be increased in rigidity. It is possible to prevent squeaking of fins due to vibration. Further, since the elastic sheet 53 and the head cover 54 are brought into contact with the outer fin 52a, the vibration of the outer fin 52a can be prevented also from this point.

Further, since the upper surfaces of the outer fin 52a and the inner fin 52b adjacent to the outer fin 52a are covered with the head cover 54 and the like, muddy water and the like enter the space a surrounded by the fins 52a and 52b and the rib 60. Since the notch 61 is formed in the inner fin 52b, even if muddy water or the like enters the space a, the intruding muddy water or the like is discharged from the notch 61 to the outside. Therefore, it is possible to prevent water, mud, and the like from being clogged by forming the rib 60.

Since the notch 61 is formed on the inner fin 52b instead of the outer fin 52a, the notch cannot be seen in a side view, and the appearance can be prevented from being deteriorated by providing the notch. Further, since the muddy water flows out to the front side of the vehicle, it is not contaminated with the muddy water or the like when viewed from the side, and this also prevents the deterioration of the appearance.

Here, as shown by a chain double-dashed line in FIG. 5, for example, leg portions 53a are integrally formed on the elastic sheet 53 so as to project.
The leg portion 53a may be pushed between the outer fin 52a and the inner fin 52b. In this case, the vibration of the outer fins 52a can be further suppressed without increasing the number of parts, and the number of ribs 60 can be reduced or omitted.

According to the cylinder body mold 70 of this embodiment, the upper half portion 66a of the convex flange portion 66 is
It is formed by the left and right mother molds 71 and 72 and the exhaust core 73, and the lower half portion 66b is formed by the exhaust core 73 and the hollow mold 74.
Since it is formed with the lower half mold portion 74d formed in the above, the exhaust core 73 has the exhaust port port portion 7
3a and the cylindrical portion 73b for the inner peripheral surface of the convex flange 66 are sufficient, and the core structure can be simplified and the cost can be reduced as compared with the conventional case where separate cores are formed and then joined.

Further, with the lightening die 74 alone, the lightening depression 37
Since a and the lower half portion 66b of the convex flange portion 66 can be formed at the same time, a separate mold member can be eliminated, and the cost can be reduced accordingly.

According to the air cleaner device 68 of the present embodiment, the air inlet chamber A is constituted by the connecting portion of the main frame 4 and the rail bracket 6 and the gusset 7 surrounding the portion, and the air inlet chamber 7a of the gusset 7 is provided. Since the intake duct portion 86 of the air cleaner 80 is inserted and opened in the air introduction chamber A, water can be reliably prevented. In addition, the intake inlet 7
Since a is located higher than the bottom surface of the air introducing chamber A, water that has entered the air introducing chamber A does not enter the intake duct portion 8b, and the lowermost position of the air introducing chamber A is conscious. Since the main frame 4 and the main frame 4 that have been specially provided are discharged to the outside through the non-welded portion (water drainage) between the main frame 4 and the set 7, it is possible to prevent the invading water from mixing with the air. As a result, it is possible to reliably prevent the inhalation of rainwater and the like without requiring a special water-prevention plate or the like.

Further, the intake duct portion 86 is connected to the case main body 8
Since it is integrally formed with the duct 1, the cost can be reduced as compared with the case where a separate duct is provided. Further, since the volume of the air introduction chamber A is larger than that of the other vehicle body parts, the intake amount does not decrease, and the inside of the gusset 7 having higher rigidity is used as the air introduction chamber A. It can be prevented from becoming a generation source. Further, since the intake duct 86 is provided and the inside of the air cleaner is inverted, both the upstream intake port 86a and the discharge port 81d are formed on the case body 81 side, the case cover 82 side does not require a communicating portion as an intake passage. Since the structure is easily attached and detached, maintenance such as cleaning and replacement of the element is easy. Further, the element 83 is sandwiched between the case body 81 and the case cover 82,
Since the case cover 82 is detachable, the element 83 can be replaced by simply removing the case cover 82, and maintenance can be easily performed from this point as well.

According to the kick starter of this embodiment,
When the kick shaft 90 is spanned and supported by the left and right cases 95a and 95b, the left case 95a of the kick shaft 90 is supported.
Since the stopper 96 is fixed to the side and the ratchet 92 and the kick gear 93 are mounted, the assembling work can be easily performed. That is, when assembling the kick shaft 90 to the crankcase 36, the left end portion is assembled to the shaft support hole of the left case 95a with the stopper 96, the ratchet 92, and the kick gear 93 previously attached to the kick shaft 90, and After connecting the case 95a and the right case 95b, the kick shaft 90 is rotated to the pre-rotation position so that the stopper 96 contacts the case-side stopper portion at the portion of the kick shaft 90 protruding outward from the right case 95b. The return spring 98 and the collar 99 are mounted in the moved state. Then, the case cover 95c may be attached, and finally the kick arm 91 may be attached. Therefore, it is possible to eliminate the conventional mounting work while aligning the stopper and the ratchet, and improve workability. A slit is formed in the collar 99, and the collar 99 can be attached after the spring 98 is attached by positioning the end of the return spring 98 in the slit.

Further, the spring and guide for moving the conventional ratchet in the axial direction can be eliminated, and
Since only one circlip is required to hold the kick gear immovably, it is possible to reduce the number of parts and the number of work steps and the cost.

In the above embodiment, the kick arm is arranged on the right side of the engine, but the kick arm may be arranged on the left side. In this case, the arrangement positions of the respective parts are symmetrical with respect to FIG.

[0050]

According to the present invention, the space formed by fixing the reinforcing plate so as to surround the connecting portion between the rear end of the main frame and the rail bracket is used as an air introducing chamber, and the air introducing chamber is provided in the air introducing chamber. Since the intake port of the air cleaner case is opened, since the reinforcing plate functions as a water entry prevention plate, it is possible to prevent entry of water without using a separate member, and it is possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a left side view of a motorcycle for explaining an air cleaner device according to an embodiment of the present invention.

FIG. 2 is a left side view of a body frame of the motorcycle.

FIG. 3 is a sectional left side view of the air-cooled engine.

FIG. 4 is a plan view of a cylinder head of the engine.

5 is a sectional front view of the cylinder head (FIG. 4).
VV line sectional view).

FIG. 6 is a cross-sectional left side view of the cylinder head.

FIG. 7 is a sectional left side view of the cylinder body of the engine.

FIG. 8 is a bottom view of the cylinder body.

FIG. 9 is a right side view showing a mold of the cylinder body.

FIG. 10 is a front view showing the mold.

FIG. 11 is an exploded perspective view of the mold.

FIG. 12 is a cross-sectional plan view of the air cleaner device for the engine.

FIG. 13 is a left side view of the air cleaner device with a case cover removed.

FIG. 14 is a sectional plan view of the kick starter for the engine.

FIG. 15 is a right side view of the kick starting device with a case cover removed.

FIG. 16 is a view showing a suction cover of the air cleaner device.

[Explanation of symbols]

 1 Motorcycle 2 Body Frame 3 Head Pipe 4 Main Frame 7 Gusset (Reinforcement Plate) 11 Rail Bracket 80 Air Cleaner Case 86a Inlet A Air Introducing Chamber

Claims (1)

[Claims] 1. An air cleaner device for a motorcycle, comprising a vehicle body frame, wherein a rail bracket for supporting a seat rail is connected to a rear end portion of a main frame extending from a head pipe to the rear of the vehicle body. A reinforcing plate is fixed to the connecting portion with the bracket so as to surround the connecting portion from above, and the air surrounded by the reinforcing plate, the rear end portion of the main frame and the rail bracket serves as an air introducing chamber, and the air introducing chamber. An air cleaner device for a motorcycle, wherein an air cleaner case is arranged on either the left or right side of the air cleaner case, and an intake port of the air cleaner case is opened into the air introduction chamber.