JP2000085666A - Air cleaner device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner device for motorcycles that has an improved steam separation function causing no resultant increases in size of its air cleaner case. SOLUTION: This air cleaner device for motorcycles comprises a filter cover defining a cleaner chamber 128a for accommodating an air filter 140, an outdoor-air inlet cover 139 defining an outdoor air chamber 128b into which outdoor air is lead via an outdoor air inlet 139a, and an air duct 141 connecting the outdoor air chamber 128b and the primary air-filter side of the cleaner chamber 128a together. An air inlet 141b of the air duct 141 is offset from the air filter 140 to the counter side to the inlet 139a.

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 motorcycle.

[0002]

2. Description of the Related Art An air cleaner device for a motorcycle has an air inlet for introducing outside air into an air cleaner case containing an air filter, and an air supply port for supplying air filtered by the air filter to an engine side. Is formed.

[0003] In this type of air cleaner device, in order to prevent water or the like flowing from an outside air inlet into the air filter, a cleaner chamber in which the air filter is housed and an outside air inlet are conventionally provided in an air cleaner case. There is a case where a structure is adopted in which the external air introduction chamber is divided into the formed external air introduction chamber, and the external air introduction chamber is communicated with the primary side of the air filter of the cleaner chamber by an air duct.

[0004]

However, in the above-mentioned conventional air cleaner device, depending on the arrangement of the outside air introduction port and the air duct, a sufficient air / water separation function in the outside air introduction chamber may not be obtained. Rainwater or the like may enter the filter side.

Here, in order to enhance the steam-water separation function,
It is effective to make the capacity of the outside air introduction chamber as large as possible. However, increasing the capacity of the outside air introduction chamber causes a problem that the size of the air cleaner case increases, and also causes a problem that the appearance deteriorates.

The present invention has been made in view of such circumstances, and has as its object to provide an air cleaner device for a motorcycle which can enhance the steam-water separation function without increasing the size of the air cleaner case.

[0007]

According to the first aspect of the present invention, there is provided a filter case having a cleaner chamber for accommodating an air filter, an outside air introduction case having an outside air introduction chamber for introducing outside air from an outside air introduction port, and the outside air introduction case. In a motorcycle air cleaner device having an air duct communicating an introduction chamber and an air filter primary side of the cleaner chamber, an air inlet of the air duct is deviated in a direction away from the outside air introduction port with respect to the air filter. It is characterized by having made it.

According to a second aspect of the present invention, in the first aspect, the air duct projects into the air filter, and the air filtered by the air filter flows out to the engine side to the side where the air duct is deviated. It is characterized in that an air discharge port to be made is located.

According to a third aspect of the present invention, in the first or second aspect, a partition wall is provided in the outside air introduction case for preventing the air introduced from the outside air introduction port from flowing into the air duct by short-circuit. It is characterized by being.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a windbreak wall is formed on an outer surface of the outside air introduction case to prevent a traveling wind from directly flowing into the outside air introduction port. It is characterized by.

[0011]

According to the first aspect of the present invention, since the air inlet of the air duct is deviated from the air filter in a direction away from the outside air inlet, the air inlet is arranged at the center of the air filter. The distance from the outside air inlet to the air inlet can be increased without increasing the size of the air cleaner case as compared with, and the water / water separation function in the outside air introduction chamber can be improved accordingly, preventing water from entering the air filter side There is an effect that can be done.

Further, since the above-mentioned improvement of the water / water separation function can be realized by a structure in which the air duct is simply displaced in a direction away from the outside air inlet, it is not necessary to increase the capacity of the outside air introduction chamber, and the case is prevented from being enlarged. As well as avoiding deterioration in appearance.

According to the second aspect of the invention, the air flowing into the primary side of the air filter through the air duct flows out to the secondary side of the air filter and then flows from the air outlet to the engine side. The air flows intensively in a portion where the flow path length is short and the air filter passage area is large. In the present invention, since the air outlet is located on the side of the air duct where the air is deflected, there is a concern that the air may flow unevenly to the air duct on the side where the air duct is deflected. However, in the present invention, since the air duct protrudes into the air filter, a substantial filter effective area of the air filter is reduced at the portion where the air duct is close to the air filter due to the protruding portion of the air duct. That is, the area where the air duct is deviated and approaches the filter has a short flow path length but a small filter effective area, while the area where the air duct is far from the filter has a long flow path length but a small filter effective area. large. Therefore, in the present invention, the total air resistance is made uniform over the entire circumference of the filter, and as a result, the air passes through the entire air filter evenly, so that the air can be used for a long time without clogging.

According to the third aspect of the present invention, since a partition wall is provided in the outside air introduction case to prevent the air introduced from the outside air introduction port from flowing into the air duct by short-circuit, the capacity of the outside air introduction chamber can be increased. Thus, there is an effect that the steam-water separation function can be further enhanced and water intrusion into the air filter can be further suppressed.

According to the fourth aspect of the present invention, since the windbreak wall for preventing the traveling wind from directly flowing into the outside air introduction case from the outside air introduction port is formed, it is possible to prevent rainwater or the like from entering the air cleaner case itself. Combined with the steam-water separation function, there is an effect that water can be more reliably prevented from entering the air filter.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIGS. 1 to 40 are views for explaining a motorcycle air cleaner device according to an embodiment of the present invention. FIGS. 1 to 3 are side views, plan views, front views, and FIGS. 5 and 6 are a plan view and a right side view of the engine unit, and FIGS. 7 to 9 are a right side view, a main part enlarged view, a sectional view, and a sectional view of the unit case cover of the engine unit. 11
12 and 13 are plan and side views of a plug-side cover of the head cover, and FIGS. 14 and 15 are plan and side views of a cover bracket of the plug-side cover. 16 and 17 are a plan view and a sectional view of the fixed side cover of the head cover.
19 is a plan view and a side view of the cover bracket of the fixed side cover, FIG. 20 is a sectional view of a rear wheel-side input portion of the shaft drive mechanism, FIG. 21 is a sectional view of an engine-side output portion of the shaft drive mechanism, and FIG. 23 is a rear view of a vehicle speed detecting device provided at the engine side output unit, FIG. 23 is a cross-sectional view showing a starting device of the engine unit, FIG. 24 is a side view of a crankcase of the engine unit, and FIGS. FIGS. 27 and 28 are left side views and plan views of the secondary air supply device, FIGS. 29 and 30 are arrangement diagrams of supply pipes of the secondary air supply device, and FIGS. FIGS. 35 and 36 are a cross-sectional side view and a cross-sectional front view of the air cleaner device, and FIGS. 37 to 39 for explaining the muffler structure.
Is a side view and a sectional view of the cleaner body of the air cleaner device,
FIG. 40 is a plan view of a silencer section of the air cleaner device. Note that the terms front and rear, left and right in the present embodiment refer to front and rear and left and right as viewed in a state of sitting on a seat.

In FIG. 1, reference numeral 1 denotes an American sports type motorcycle, which pivotally supports a steering shaft 4 with a head pipe 3 at a front end of a cradle-type body frame 2 and an engine unit 5 in the body frame 2.
While supporting the rear arm 6 at the rear end,
Further, a large fuel tank 7 is provided above the body frame 2.
And a structure having a seat 8 mounted thereon. At the center of the upper surface of the fuel tank 7, a speedometer 7a is provided.

The steering shaft 4 has a pair of left and right front forks 4a, 4a,
The steering wheel 9 is fixed to the upper end of the front fork 4a, and the front wheel 10 is supported between the lower ends.

The vehicle body frame 2 includes a pair of left and right main tubes 2a extending substantially linearly inclining from the head pipe 3 to the rear of the vehicle body, and a down tube extending downward and substantially linearly rearward from the lower end of the vehicle body. It comprises a tube 2b and a connecting member 2c for connecting the rear end of the down tube 2b and the rear end of the main tube 2a.

The main tube 2a below the seat 8
Is connected to a middle part of the down tube 2b by a suspension bracket 2d extending in a vertical direction. A body cover 13 described below is provided between the main tube 2a and the down tube 2b below the seat 8, and the body bracket 13 covers the suspension bracket 2d.

The rear arm 6 is, as shown in FIG.
Upper arm 6a bent in a substantially U-shape in plan view
And the rear ends of the left and right underarms 6b, 6b are connected by a rear bracket 6c, and the front end of the upper arm 6a and the front end of the underarm 6b are connected by a plurality of pieces. It has a schematic structure connected by a pipe 6d, and has an axle 11 of a rear wheel 11 between the left and right rear brackets 6c.
a is inserted and supported.

The rear bracket 6c has a recess 6e which is open rearward and is formed by cutting in the front-rear direction, and the axle 11a is inserted and fixed in the recess 6e. The recess 6e allows the axle 11a to be removed to the rear of the vehicle together with the rear wheel 11.

The front ends of the left and right underarms 6b are pivotally supported via a pivot shaft 12 by the suspension bracket 2d so as to be vertically swingable. A rear suspension 15 is provided between the vehicle body frame 2 and the rear arm 6. The rear suspension 15 has a structure in which an upper end of a cushion 16 arranged substantially upright is supported by a suspension bracket 2d, and a lower end is connected to a link mechanism 17 interposed between the rear arm 6 and the suspension bracket 2d. It has become.

When viewed from the side of the vehicle body, the upper arm 6
a and the under arm 6b are respectively connected to the main tube 2
a and the down tube 2b. In this manner, the body frame 2 is a rigid frame in appearance (see FIG. 1).

The engine unit 5 is suspended and supported in a cradle surrounded by the main tube 2a, the down tube 2b, and the suspension bracket 2d. The engine unit 5 is a water-cooled V-type two-cylinder four-stroke engine. The unit case 18 has a schematic structure in which a crankcase 20 and a transmission case 19 are integrated and an oil pan 18a is connected to the lower surface. I have.

A front cylinder block 21a, which is inclined forward, is fixedly connected to the front of the crankcase 20, and a front cylinder head 22a is fixedly connected to the upper surface of the front cylinder block 21a. A rear cylinder block 21b and a rear cylinder head 22b that are inclined rearward are connected and fixed to the rear of the crankcase 20. The front cylinder block 21a, the cylinder head 22a and the rear cylinder block 21b, and the cylinder head 22b are fixed. Are arranged so as to form a V-shape when viewed in the axial direction of the crankshaft 23, and to the left,
It is arranged slightly offset to the right.

The front and rear cylinder blocks 21a, 21a
Each of the pistons 24 inserted and arranged in the inside 21 b is connected to a crankpin 23 a of a crankshaft 23 by a connecting rod 25. The crankpin 23a of the crankshaft 23 is 2
The connecting rod 25 is used in common, so that the shaft length of the crankshaft 23 is shortened and the engine width is narrowed. The front and rear cylinder heads 2
An ignition plug 26 is inserted into the combustion recesses 2a and 22b, and the ignition plug 26 is arranged outward in the vehicle width direction (see FIG. 5).

A case opening 18b is formed in the right side wall of the unit case 18 over substantially the entire area of the crankcase 20 and the transmission case 19, and a unit case cover 27 is attached to the opening 18b.

The unit case cover 27 is shown in FIGS.
As shown in FIG. 9, the entire area of the case opening 18b is covered.
A first cover 27a fixed to the unit case 18 with the bolts 30a, and a second cover that covers most of the front part of the first cover 27a and is fixed to the first cover 27a with three bolts 31a. 27b and a circular third cover 27 that covers a portion of the second cover 27b facing the crankshaft 23 and is fixed to the second cover 27b with three bolts 31b.
c) and has a triple structure.

An oil filter 28 is disposed below the front end of the crankcase 20. A working hole 27d large enough to take out the filter 28 is formed to face the oil filter 28 in the first cover 27a. A cap 29 is removably inserted into the working hole 27d. The cap 29 is formed with a flange 29a abutting on the end face of the working hole 27d. The flange 29a is sandwiched between the first cover 27a and the second cover 27b by two bolts 30b, and the crankcase is closed. 20 are fixed together.

To replace the oil filter 28,
The bolts 30b and 31a are removed, the second cover 27b is opened, the cap 29 is pulled out, and the oil filter 28 is taken out.

As described above, the unit case cover 27 is
Because of the double structure, the degree of freedom in design of each of the covers 27a to 27c can be improved, and the appearance can be improved. For example, in the case where a cover dedicated to the oil filter is attached to a portion of the case cover facing the oil filter as in the related art, there is a problem that the degree of freedom in the design of the entire cover is restricted. On the other hand, in the present embodiment, the second filter is used without being particular
The shape of the cover 27b can be freely designed.

Further, the third cover 27c can be replaced with a cover which has been subjected to a surface treatment according to the user's preference, and the appearance can be improved from this point as well. Further, since the unit case cover 27 is divided into three parts, the production becomes easier as compared with the case where the large cover is integrally produced.

The front and rear cylinder heads 22a, 22
A decorative head cover 35 is attached to 2b.
Since the head cover 35 is common to both cylinder heads, only the head cover 35 of the front cylinder head 22a will be described here. The head cover 35 is made of resin and has a chrome plating on the surface, so that a head cover forming a cam chamber is mounted on the upper surfaces of the cylinder heads 22a and 22b when viewed from the side of the vehicle body. The appearance is improved by presenting such an appearance.

The head cover 35 is shown in FIGS.
As shown in the figure, the plug-side cover 36 attached to the spark plug 26 side and the fixed-side cover 3 attached to the opposite side to the plug side.
7 is divided into left and right.

The plug-side cover 36 is supported by a metal cover bracket 39 which is fixed to the upper surface of the cylinder head 22a with two bolts 38. Supporting portions 39a, 39a extending outward in the vehicle width direction are integrally formed at both fastening portions of the cover bracket 39,
A vertical piece 39b is formed substantially vertically at the end of each support piece 39a, and an engagement hole 39c is formed in the vertical piece 39b.

The cover bracket 39 is integrally formed with an arm piece 39d extending to an intermediate portion between the two vertical pieces 39b, and a rivet 39e is provided at a tip end of the arm piece 39d.
Is fixed. Reference numeral 39f denotes a bolt hole into which the bolt 38 is inserted, and a grommet 39g is fitted in the engagement hole 39c.

The plug-side cover 36 is provided with a ceiling wall 36a that covers an outer portion of the upper surface of the cylinder head 22a in the vehicle width direction.
A middle wall 36b extending inward so as to go around the side of the cylinder head 22a following the top wall 36a, and a traverse extending downward from the outer end of the middle wall 36b and further bending inward. It has a substantially hook-shaped lower wall 36c, and an engaging recess 36d is formed integrally with the lower wall 36c. The top wall 36 of the plug-side cover 36
An inwardly extending engaging claw 36e is formed at both ends of the boundary between the a and the inner wall 36b. In addition, the engaging claw 3
A reinforcing rib 36e 'is formed around 6e, and a rubber grommet 39h is mounted on the rivet 39e of the bracket 39 with which the engaging recess 36d is engaged.

The plug-side cover 36 is mounted by being pushed inward from the outside in the vehicle width direction of the cylinder head 22a.
Engages with the engaging hole 39c of the vertical piece 39b via the grommet 39g, and the engaging concave portion 36d engages with the rivet 39e via the grommet 39h. The plug-side cover 36 is detachable without using a tool by engaging or disengaging the rivet 39e and the two engaging claws 36e.

The fixed side cover 37 is mounted on the cylinder head 2.
It is supported by a cover bracket 41 which is fastened and fixed with two bolts 40 to the upper surface on the side opposite to the plug 2a.
At both ends of the cover bracket 41, fixing pieces 41a, 41a extending outward in the vehicle width direction are integrally formed, and a screw hole 41b is formed at the tip of each fixing piece 41a. Reference numeral 41c denotes a bolt hole into which the bolt 40 is inserted.

The fixed side cover 37 has a top wall portion 37a that covers the top surface of the cylinder head 22a, and a bottom wall portion that extends inward so as to extend around the side portion of the cylinder head 22a following the top wall portion 37a. The bottom wall 37b is provided with four fitting bosses 37c formed on the bottom wall 37b.
The connection is achieved by engaging a fitting claw 37d formed at the position a.

Further, the fixed side cover 37 is
A bolt 42 is inserted into a bolt hole 37f in a concave portion 37e formed in the concave portion 37a and screwed into a screw hole 41b of the fixing piece 41a to be fastened and fixed to the cover bracket 41. The head of the bolt 42 is hidden in the recess 37e and is not visible from the outside.

In the present embodiment, the head cover 35 is divided into a plug cover 36 and a fixed cover 37 on the left and right sides. The degree can be improved, and the merchantability can be improved.

Also, since the head cover 35 is divided into left and right parts, the structure of the ignition plug 26 requiring maintenance can be easily removed, and the opposite side of the plug which does not require maintenance can be separated by bolting and fixing. it can. As a result, when maintenance and replacement of the ignition plug 26 are performed, or when the oil delivery bolt union 43 is disposed near the ignition plug 26 (see FIG. 10).
Can be removed to perform a hydraulic check to improve workability.

The plug-side cover 36 is composed of a top wall 36a covering the upper surface of the cylinder head 22a, and a middle wall 36b extending inward of the cylinder head 22a. The inside of the cylinder head 22a can be covered, and the appearance can be improved. By the way, conventionally, the cross-sectional shape is generally hook-shaped, which covers the side surface following the upper surface of the cylinder head.
Therefore, there is a disadvantage that the inside can be seen from obliquely below.

The fixed side cover 37 has a top wall 3
7a and the bottom wall 37b are divided into upper and lower parts,
It is possible to improve the degree of freedom of the shape by avoiding the problem of mold removal during resin molding, prevent the inside from being seen from below the vehicle body by the bottom wall portion 37b, and improve the appearance as described above.

In the transmission case 19, as shown in FIG. 5, a transmission gear group (not shown) constituting the transmission.
And a first drive shaft 46 equipped with a counter gear group (not shown) meshing with the transmission gear group are arranged in parallel with the crankshaft 23. A clutch mechanism 47 is mounted on the right end.

The engine unit 5 has the structure shown in FIGS.
As shown in FIGS. 0 to 22, a shaft drive mechanism 50 that transmits engine power to the rear wheels 11 is connected. The shaft drive mechanism 50 includes an engine-side output unit 51
And a rear wheel-side input unit 52 are connected by a drive shaft 53 (transmission shaft) arranged in the vehicle front-rear direction. The front half of the drive shaft 53 is the body cover 1
3 and a connecting member 2c at the rear half of the frame.
The portion between the rear wheel side input portion and the rear gear case 65 is exposed outward (see FIG. 1).

The engine-side output section 51 has the following structure. A gear case 19a filled with lubricating oil is integrally formed at the rear end of the transmission case 19, and the first drive shaft 46 is provided in the gear case 19a.
A second drive shaft 54 is disposed in parallel with the second drive shaft 54. On the left side of the second drive shaft 54, an output shaft 55 extending in a direction perpendicular to the drive shaft 54 (in the longitudinal direction of the vehicle body) is disposed, and the two shafts 54, 55 are bevel gears 56a, 5b.
6b.

A case opening 19b is formed in the rear end surface of the gear case 19a, and a lid member 58 is fixed to the case opening 19b with three bolts 59 via a seal member 57. The cover member 58 has an output hole 58a.
Are formed through the output hole 58a.
The rear end portion 55a projects rearward. This output shaft 55
Is rotatably supported by a bearing 60 mounted on the lid member 58.

The rear end 55a of the output shaft 55 and the front end 53a of the drive shaft 53 are connected by a universal joint 61. The universal joint 61 has a structure in which a first yoke joint 61a and a second yoke joint 61a are connected to be able to swing up, down, left and right by a cross shaft 61c.

The first yoke joint 61a is spline-fitted to the rear end 55a of the output shaft 55,
a is fastened and fixed by a nut 62 screwed to
As a result, the first yoke joint 61a is prevented from coming off. A front end 53a of the drive shaft 53 is spline-fitted to the second yoke joint 61b, and the drive shaft 53 can be pulled out rearward from the second yoke joint 61b.

An oil seal 63 is interposed between the front end of the first yoke joint 61a and the lid member 58, thereby preventing the lubricating oil in the gear case 19a from leaking to the outside. .

The rear wheel input section 52 has the following structure. As shown in FIG. 20, a rear gear case 65 is disposed on the left side of the rear wheel 11. The rear gear case 65 includes a case body 65a and the case body 65a.
The front body 65a has a front and rear split structure with a front case 65b fixed to a front end by a stud bolt and a nut 65c, and the case body 65a is fixedly fastened to the rear bracket 6c of the rear arm 6 by a bolt 6e. (See FIG. 4).

A drive bevel gear 66 is provided in the case body 65a so as to be coaxial with the drive shaft 53, and a driven bevel gear 67 which is provided so as to be coaxial with the axle 11a meshes with the drive bevel gear 66. The two bevel gears 66 and 67 are rotatably supported by a case body 65a and a lid member 65d via bearings 68a, 68b and 68c, respectively.

The cylindrical boss portion 67 of the driven bevel gear 67
The inner peripheral surface of a is spline-fitted to the outer peripheral surface of a boss member 69 fixed to the wheel hub 11b of the rear wheel 11, whereby the rotation of the driven bevel gear 67 is transmitted to the rear wheel 11 via the coupling member 69. Is done.

The front shaft portion 66a of the drive bevel gear 66
The base 70a of a cylindrical joint member 70 is spline-fitted with the front shaft part 6.
It is immovably fixed in the axial direction by a nut 71 screwed to 6a. The cylindrical portion 70b of the joint member 70
Protrudes into the front case 65b from the front mating surface of the case body 65a, and a slightly concave R-shaped inner peripheral tooth 70c is formed on the inner peripheral surface of the cylindrical portion 70b.

A rear end 53b of the drive shaft 53 is inserted into the front case 65b, and between the rear end 53b and the front end of the front case 65b, foreign matter is prevented from entering the case 65b. A dust seal 72 is provided. The inner peripheral teeth 70 are provided on the outer periphery of the rear end 53b.
A slightly convex R-shaped outer peripheral tooth 53c that meshes with the drive shaft 53 is formed, so that the drive shaft 53 and the joint member 70, that is, the drive bevel gear 66 can slightly swing up and down and left and right. The rotation of the drive shaft 53 is transmitted to the drive bevel gear 66 via the joint member 70.

The rear end 5 of the drive shaft 53
A seal member 73 slidingly contacting the inner peripheral surface of the cylindrical portion 70b is provided at 3b.
Is installed. The sealing member 73 at the rear end 53b
A washer 74 is positioned and mounted on a front side of the circlip 75 by a circlip 75.
Is prevented from moving in the axial direction.

A plurality of retaining ribs 76 extending in the axial direction are formed integrally with the inner peripheral wall of the front case 65b at circumferential intervals. The rear end surface 76a of the rib 76
The circlip 75 is opposed at a predetermined interval, and the interval is set to a distance at which the seal member 73 does not come off from the cylindrical portion 70b of the joint member 70 due to the forward movement of the drive shaft 53 when the rear wheel 11 is removed. Is set.

In the retaining structure of the present embodiment, the circlip 75 of the drive shaft 53 in the front case 65b.
Since a plurality of retaining ribs 76 are formed in a portion opposed to, the assemblability and maintainability can be improved.

For example, when replacing the tires of the rear wheel 11, the rear gear case 65 is removed together with the rear wheel 11 from the rear arm 6, and the drive shaft 53 is pulled out from the second yoke joint 61b. In this case, the outer teeth 53c of the drive shaft 53
Of the cylindrical portion 7c of the cylindrical portion 7c.
However, in the present embodiment, the gap between the rear end surface 76a of the rib 76 and the circlip 75 is set so that the seal member 73 does not fall off the joint member 70, so that the drive shaft 53 moves. Even if the seal member 73 falls off the joint member 70,
The inner teeth 70c and the outer teeth 53c are not disengaged from each other, so that the assemblability and maintainability can be improved.

Further, since the structure is such that the ribs 76 are only formed integrally with the front case 65b, it is possible to suppress an increase in cost as compared with the case where the retaining is performed by using another component.

Next, the vehicle speed detecting device of the motorcycle 1 will be described. As shown in FIGS. 21 and 22, the present vehicle speed detecting device includes a plurality of outer teeth 78 formed at predetermined intervals.
An annular pickup rotor 78 having a, a pickup 79 for detecting the rotation of the rotor 78, and a built-in speedometer 7a (see FIGS. 1 and 2) based on a detection value from the pickup 79. ECU (not shown) that outputs a drive signal to a stepping motor (not shown)
It is composed of

The rotor 78 is provided on the universal joint 61 projecting rearward from the gear case 19a of the engine-side output portion 51, and the pickup 79
Are disposed so as to face the rotor 78, and these are covered by the vehicle body cover 13.

The boss portion 61 of the first yoke joint 61a of the universal joint 61 is connected to the rotor 78.
The pickup 79 is press-fitted and fixed so as to be coaxial with the support bracket d, and the support bracket 8 is fixedly fastened to the rear end face of the lid member 58 of the gear case 19a by bolts 59.
It is fixed to 0.

The support bracket 80 has a support piece 80a.
The pickup 79 is fastened and fixed to the support piece 80a by a bolt 80b. The detecting portion 79a of the pickup 79 is opposed to the outer peripheral teeth 78a of the rotor 78 with a slight gap, and the lead wire 79b led out from the detecting portion 79a is connected to the above-described EC.
U is connected.

The operation and effect of the vehicle speed detecting device of the present embodiment will be described. In the present embodiment, the engine-side output unit 51
The pickup rotor 78 is fixed to the first yoke joint 61a of the universal joint 61 projecting rearward from the gear case 19a, and the pickup 7 is mounted on the cover member 58 of the gear case 19a via the support bracket 80.
Since the pickup 9 is fixed, the pickup 79 and the rotor 78 are mounted so as to be exposed to the outside, so that a special hole-forming process and a seal which are required when the pickup 79 and the rotor 78 are mounted in a lubrication bath of a gear case can be omitted, and the cost can be reduced.

The rotor 78,
Since the pickup 79 is arranged, the rotor 78 and the pickup 79 can be pre-assembled as an engine assembly, and the labor can be reduced as compared with the case of retrofitting.

In the above-described embodiment, the rotor 78 and the pickup 79 are disposed around the universal joint 61 of the engine-side output unit 51. However, the present invention is not limited to the rear-wheel input unit 52 or the drive shaft 53. In other words, it may be disposed at the non-lubricated portion of the shaft drive mechanism 50.

In the above embodiment, the case where the rear arm 6 and the drive shaft 53 are separate has been described.
The present invention is also applicable to an integrated type in which a drive shaft is housed in a rear arm.

The starting device for the motorcycle 1 is shown in FIG.
This will be described with reference to FIGS. The left and right crank journals 23b of the crankshaft 23 are connected to the crankcase 20.
Is supported via a bearing 20b on a boss portion 20a formed on the surface of the same. A crankcase cap 20d is attached to the left mating surface of the crankcase 20,
The left end of the crankshaft 23 projects from the crankcase 20 into the crankcase cap 20d.

A generator 8 is provided at the left end of the crankshaft 23.
2 is installed. This generator 82 includes a rotor 82a
Is provided with a magnet 82b on the inner peripheral surface thereof and a stator 82c provided so as to face the magnet 82b.

A rotor boss 83 is provided on the crankshaft 23 inside the rotor 82a in the vehicle width direction. The rotor boss portion 83 has a large-diameter flange portion 83a that contacts the back surface of the rotor 82a, and a boss portion 83 that has a smaller diameter than the flange portion 83a and extends inward in the axial direction of the crankshaft 23.
The flange 83a is fixed to the rotor 82a by rivets. The rotor boss 83
Is formed with a female tapered hole 83c.

At the left end of the crankshaft 23, a male taper portion 23c is formed, and the male taper portion 23c is fitted in the female taper hole 83c of the rotor boss portion 83. The male taper portion 23c and the boss portion 83b are key-fitted, and a nut 84 for preventing the rotor boss portion 83 from moving in the axial direction is screwed to the end of the crankshaft 23.

A cam drive sprocket 85 is rotatably mounted inside the rotor boss 83 in the axial direction.
As shown in FIG. 35, the cam drive sprocket 85 is connected to a cam shaft 86b through a chain 86a, and drives the intake valve 86c and the exhaust valve 86d to open and close by rotating the cam shaft 86b. It is. The cam drive sprocket 8 of the crankshaft 23
5, an oil pump drive sprocket 77
Has been fixed.

A damper mechanism 87 is provided between the cam drive sprocket 85 and the rotor boss 83.
The damper mechanism 87 has a concave groove 83d extending in the circumferential direction formed on the back surface of the boss 83b, and a protrusion 85a formed on the cam drive sprocket 85 is inserted into the concave groove 83d. The spring members 87a and 87b for biasing the crankshaft to the intermediate position in the circumferential direction are provided, whereby the rotation of the crankshaft 23 is controlled by the damper mechanism 8
7 to the cam drive sprocket 85.

On the outside of the crankcase 20 in front of the crankshaft 23, a starting motor 88 is provided with an output shaft 88a.
Are arranged parallel to the crankshaft 23. The starting motor 88 is inserted and supported in an insertion hole 20c formed in the crankcase 20, and a rear end portion is fixed to an outer wall (not shown) of the crankcase 20 with a bolt via a mounting bracket 88c.

An output gear 88b is connected to the output shaft 88a, and an intermediate large gear 89a meshes with the output gear 88b. The left axial boss 8 of the intermediate large gear 89a
An intermediate small gear 89b is press-fitted to 9c, and a support shaft 89d is inserted into the axis of the intermediate large gear 89a. The support shaft 89d is connected to the crankcase 20.
And the crankcase cap 20d.
The pressure input of the intermediate small gear 89b is set so that the intermediate small gear 89b slides on the boss 89c when a torque greater than a predetermined value acts. This protects the starting motor 88 when a large reverse power acts on the engine at the time of starting the engine.

A drive gear 90 meshing with the intermediate small gear 89b is rotatably mounted on the outer periphery of the boss portion 83b of the rotor boss portion 83 via a needle bearing 90a. The drive gear 90 and the damper mechanism 87
And overlap in the direction perpendicular to the axis of the crankshaft 23

As shown in FIG. 26, a washer 90b is mounted on the inner end of the needle bearing 90a.
The washer 90b is prevented from moving in the axial direction by fitting a circlip 90c into a circumferential groove 83e formed on the outer periphery of the boss portion 83b. As described above, the circumferential groove 82 in which the circlip 90c is fitted in the rotor boss portion 83.
Since e is formed, the concentration of stress on the crankshaft 23 can be reduced. That is, when the circumferential groove for the circlip is formed on the crankshaft 23, there is a concern that stress is likely to concentrate on the circumferential groove portion.

A boss portion 90 d is formed stepwise on the outer side of the drive gear 90 in the axial direction, and a ring member 92 is inserted around the outer periphery of the boss portion 90 d via a one-way crack 91. This ring member 92 has a rotor boss 83
Is fastened and fixed to the flange portion 83a by a bolt 92a. The one-way clutch 91 is connected to a starting motor 88.
Is transmitted to the crankshaft 23 side, and the crankshaft 2
The third rotational force is not transmitted to the starting motor 88 side.

The operation and effect of the starting device of this embodiment will be described. According to the present embodiment, the rotor boss portion 83 fixed to the rotor 82a is taper-fitted to the engine center side of the generator rotor 82a of the crankshaft 23, and the outer periphery of the rotor boss portion 83 is interposed via the one-way clutch 91. The drive gear 90 is attached to the drive shaft 90, and the dry gear 90 is connected to the output gear 88b of the starting motor 88.
And the starting motor 88 are always meshed via the one-way clutch 91, so that a more unpleasant gear meshing sound can be avoided as compared with the conventional dive type. Further, a conventional dive-type fork lever, a solenoid for driving the fork lever, and the like can be eliminated, so that the structure can be simplified and the cost can be reduced.

Further, a rotor boss portion 83 is arranged on the engine shaft side of the generator rotor 82a of the crankshaft 23, and a one-way clutch 91,
Since the drive gear 90 is disposed, the shaft length of the crankshaft 23 can be shortened, which is advantageous in manufacturing and can improve rigidity. That is, conventionally, the rotor boss portion is arranged separately outside the rotor of the crankshaft in the axial direction, and the starting boss portion is separately arranged inside the axial direction. Therefore, there is a problem that the shaft length of the crankshaft becomes long. there were.

In this embodiment, the rotor boss 8
Damper mechanism 8 between cam 3 and cam drive sprocket 85
Since the damper mechanism 87 and the drive gear 90 are disposed so as to overlap in a direction perpendicular to the shaft, the length of the crankshaft 23 can be shortened from this point as well.

Next, a secondary air supply device of the motorcycle 1 will be described with reference to FIGS. Exhaust ports are opened in the front wall of the front cylinder block 21a and the rear wall of the rear cylinder block 21b of the engine unit 5, and the exhaust ports are located upstream of the front and rear exhaust pipes 94a and 94b, respectively. The ends are connected. The exhaust pipes 94a and 94b are led out of the exhaust ports to the right side of the engine unit 5 and extend substantially linearly rearward from the right side. A muffler body 95a is provided at the downstream end of the exhaust pipes 94a and 94b. , 95b are connected (see FIG. 2).

The secondary air supply device has an air cleaner 96 for secondary air, and a secondary air valve 97 for supplying secondary air to the exhaust system by intake negative pressure and exhaust pulsation. Is supplied to the exhaust system through the secondary air valve 97 to burn unburned components in the exhaust gas to purify the exhaust gas.

The secondary air valve 97 is composed of a secondary air valve that is formed by integrating a reed valve 98 that opens and closes due to exhaust pulsation and an air cut valve 99 that is integrally connected to the upper part of the reed valve 98 and that opens and closes by intake negative pressure. Has become Assy.

The secondary air valve 97 and the air cleaner 9
6 is disposed inside the vehicle body cover 13 below the seat 8 and is covered by the vehicle body cover 13. The vehicle body cover 13 is an upper / lower two-part body composed of a resin upper cover 13a and a zinc die-cast or aluminum die-cast lower cover 13b. A tool box is provided below the seat 8 in the upper cover 13a. 100 are arranged.

The front edge of the upper cover 13a is rotatably and detachably supported on the body frame 2 by hooks (not shown). A key cylinder 101 is mounted on the rear end of the upper cover 13a. The key cylinder 101 is locked and unlocked so that the upper cover 13a can be opened and closed and can be attached and detached.

On the other hand, the lower cover 13b is fixed to the vehicle body frame 2 and the engine unit 5 with bolts, and the fuel pump 102a,
A canister 102b and the like are provided.

Tool box 1 in the upper cover 13a
00, the secondary air valve 97 and the air cleaner 96 are disposed. The secondary air valve 97 is disposed on the front side of the vehicle, and the air cleaner 96 is disposed on the rear side of the secondary air valve 97 so as to be at substantially the same height. I have. The secondary air valve 97 and the air cleaner 96 are respectively provided with mounting brackets 103a and 103b.
And it is bolted and fixed to the vehicle body frame 2 via a bracket (not shown).

In the air cleaner 96, a lid member 96b is detachably fitted on the upper surface of a cylindrical cleaner body 96a having a bottom, and an air filter 96c is detachably mounted on the inner surface of the lid member 96b. . Thus, when the lid member 96b is removed, the air filter 96c can be taken out at the same time.

The lid member 96b has an air discharge port 104a.
The communication pipe 10 is connected to the air discharge port 104a.
The air inlet 99a of the air cut valve 99 is connected to the air cut valve 5 via the air inlet 5. A suction duct 104b extending downward is connected to the bottom wall of the cleaner body 96a, and a suction port 104c of the suction duct 104b is opened to face the inner wall of the lower cover 13b.

An intake pipe 99b connected to an intake system is connected to the front end of the air cut valve 99, and the air cut valve 99 opens and closes an air passage according to intake negative pressure from the intake pipe 99b. It is configured as follows.

A reed valve 98 is connected to a downstream end of the air cut valve 99, and two secondary air supply ports 98a and 98b are connected to a front end of the reed valve 98. A metal front supply pipe 105a is connected to the left secondary air supply port 98a, and an extended end of the supply pipe 105a is connected to a front supply nozzle 106a connected to an upstream end of the front exhaust pipe 94a. I have.

The front supply pipe 105a extends substantially linearly forward from the secondary air supply port 98a.
It extends along the upper surface of the crankcase 20 to the lower end of the front surface of the front cylinder block 21a, and extends therefrom so as to extend upward along the cylinder block 21a, so that traveling wind hits the front supply pipe 105a. Has become.

The right secondary air supply port 98b is connected to a rear supply pipe 105b also made of metal, and the extended end of the supply pipe 105b is connected to the upstream end of the rear exhaust pipe 94b and connected to the rear supply pipe 105b. It is connected to the nozzle 106b.

The rear supply pipe 105b extends from the secondary air supply port 98b substantially in parallel with the front pipe 105a, and is arranged in a substantially U-shape so as to surround the outer edge of the rear surface of the rear cylinder block 21b. Have been. In this way, the pipe lengths of the front and rear supply pipes 105a and 105b are set to substantially the same length. The right side portion 105b 'of the rear supply pipe 105b slightly protrudes from the right side surface of the rear cylinder block 21b.
The traveling wind easily hits b '.

The front and rear supply pipes 105a, 105a,
An upstream side of 105b is supported by a clamp member 107a, and an intermediate portion of the front pipe 105a is supported by a clamp member 107b fixed to the crankcase 20 by bolts.

The operation and effect of the secondary air supply device of the present embodiment will be described. According to the secondary air supply device of the present embodiment, the secondary air air cleaner 96 and the reed valve 9
8 and the secondary air valve 97, which is a secondary air assembly of the air cut valve 99, are arranged inside the vehicle body cover 13 below the seat 8, so that the intake sound of the air cleaner 96 or the opening / closing sound of the valve is reduced by the rider wind due to the traveling wind. , The air is swept backward from the seating position of the vehicle, and it is possible to prevent an unpleasant intake sound or the like from being heard.

The air cleaner 96 and the secondary air valve 9
7 is covered by the vehicle body cover 13 and cannot be seen from the outside, so that the external appearance can be improved as compared with the conventional case where it is arranged in front of the engine or in a V bank.

In the present embodiment, the secondary air valve 97 and the air cleaner 96 are arranged in front and rear, and both are arranged at substantially the same height, so that interference with the seat 8 is avoided. Seat height can be reduced. That is, the motorcycle 1 has a structure in which the seat position is set low and the wheelbase is set long as the vehicle characteristics. Therefore, when the secondary air valve 97 and the air cleaner 96 are arranged in the vertical direction or the vehicle width direction. May interfere with a sheet or the like, and as a result, the height of the sheet may increase.

The intake duct 1 of the air cleaner 96
04b is extended downward, and the intake duct 104 is extended.
b, the suction port 104c is formed at the lower end.
04c can be kept away from the rider, making it more difficult to hear the intake noise.

In the present embodiment, since the secondary air valve 97 and the air cleaner 96 are arranged inside the resin upper cover 13a which can be opened and closed by the key cylinder 101, when replacing the air filter 96c, the key operation is performed. It can be easily opened, and workability during maintenance can be improved.

Further, the suction port 104 of the air cleaner 96
c is located inside the lower cover 13b made of aluminum die-cast, which is bolted and fixed to the body frame 2, so that the lower cover 13b having high rigidity functions as a sound insulating member and reduces the leakage of intake sound to the outside. Yes, and this makes it difficult to hear the intake noise.

In this embodiment, the length of the front supply pipe 105a connected to the front exhaust pipe 94a of the V-shaped engine unit 5 and the length of the rear supply pipe 105b connected to the rear exhaust pipe 94b are substantially equal. Since the cables are arranged so as to have the same length, the secondary air can be supplied to both the exhaust pipes 94a and 94b while being balanced in substantially the same amount.

The secondary air valve 97 is disposed behind the engine unit 5 and the secondary air valve 97 and the engine 5 are connected to each other by the supply pipes 105a and 105b. It is hardly transmitted to the reed valve 98 and the like, and it is possible to avoid deterioration of the sealing property due to thermal deformation of the reed valve. Each supply pipe 105
Since the cables are routed so that the traveling wind hits a and 105b, transmission of engine heat can be suppressed from this point as well. In particular, a resin valve body may be employed from the viewpoint of reducing the weight of the reed valve in order to improve the responsiveness. In this case, thermal deformation can be prevented.

Next, the muffler structure of the motorcycle 1 is shown in FIG.
This will be described with reference to FIGS. The muffler structure of the present embodiment is configured such that a front muffler main body 95a connected to a downstream end of a front exhaust pipe 94a and a rear muffler main body 95b connected to a downstream end of a rear exhaust pipe 94b are vertically parallel. The front muffler main body 95a is shifted forward and backward so as to be located on the front side, and both muffler main bodies 95a and 95b are supported by the vehicle body frame 2. These muffler bodies 95a,
Since 95b has the same structure, the front muffler main body 95a will be mainly described.

The inside of the muffler main body 95a is defined by a first expansion chamber A1, a third expansion chamber A3, and a second expansion chamber A2 by first and second partition walls 110a and 110b, respectively, from the upstream side. The rear end of 95a is closed by a lid plate 110c. An inlet pipe 111 connected to the front exhaust pipe 94a is inserted into the first expansion chamber A1.

The first expansion chamber A1 and the second expansion chamber A2 are connected by a first pipe 112 passing through the third expansion chamber A3. The second expansion chamber A2 and the third expansion chamber A3 are connected by two second pipes 113a and 113b. The third expansion chamber A3 is connected to the outside by a third pipe 114.
The downstream end of the third pipe 114 is opened to the outside through the cover plate 110c. The first pipe 112 includes first and second partition walls 110a, 110
b, and the two pipes 113a and 113b are welded to the second partition 110b. The third pipe 114 is welded to the second partition 110b and the cover plate 110c.

The inlets of the first to third pipes 112 to 114 have a bell mouth shape for the purpose of reducing air flow noise caused by the exhaust gas flow and reducing inflow resistance. The pipes 112 to 114 have an arrangement relationship shown in FIG. That is, the first pipe 112 is located in the lower inside area divided by the vertical line L and the horizontal line M passing through the center of the muffler body 95a, and the third pipe 114 is located in the upper outside area.
However, the second pipes 113a, 113a and 1
13b is arranged. FIG. 31 is schematically shown so that all the pipes appear, and the height relationship of each pipe is not correctly represented.

The exhaust gas flowing from the inlet pipe 111 into the first expansion chamber A1 expands here and then flows through the first pipe 112 into the second expansion chamber A2, from which the second pipe 1
The air flows into the third expansion chamber A3 through 13a and 113b, and is discharged outside through the third pipe 114.

At the downstream end of the inlet pipe 111, a punching pipe 115 having a closed rear end face and a large number of holes 115a formed in the outer peripheral wall is connected. The punching pipe 115 is located at the center in the axial direction of the first expansion chamber A1, whereby the exhaust heat from the pipe 115 is transmitted substantially uniformly to the glass wool 116 described later, and the outer surface of the muffler is locally heated to a high temperature. Is prevented from doing so.

The first expansion chamber A of the front muffler main body 95a
A first portion extending upward in a direction perpendicular to the axis at a portion facing the rear end portion;
A straight pipe 117a is connected, and a similar second straight pipe 117b connected to a portion of the rear muffler main body 95b facing the front end of the first expansion chamber A1 is inserted into the first straight pipe 117a. Double straight pipe 11
Connection portions 7a and 117b are fixed by welding.
Thus, the expansion capacity is increased by connecting the first expansion chambers A1 and A1 to each other.

The axis L1 of each of the first and second straight pipes 117a and 117b viewed from the front and rear direction of the vehicle is
It is offset to the inside in the vehicle width direction from the vertical line L passing through the center of a, 95b, whereby the exposed portion of the straight tube viewed from the outside can be reduced, and the appearance is improved.

The first and second straight pipes 117a, 117
17b are front and rear muffler bodies 95a and 95b, respectively.
To each muffler body 95a,
95b is plated. After plating, the first straight pipe 117a and the second straight pipe 1
17b. The burned portions of the first and second straight pipes 117a and 117b due to welding of the plating films are repaired by painting.

The first expansion chamber A1 of the front and rear muffler bodies 95a, 95b thus displaced in the front-rear direction.
When communicating with each other, each muffler body 95a, 95
b, straight pipes 117a, 117 extending in a direction perpendicular to the axis
b is welded in advance and plated, then the straight pipes 117
Since a and 117b were welded, the number of welds after plating can be reduced, and the occurrence of rust and the like due to long-term use can be reduced. By the way, conventionally, there is a case where the front and rear muffler bodies are communicated with each other by an S-shaped pipe. In this case, both ends of the pipe are welded to each muffler body after plating, and the welding area increases accordingly. There was a problem. Further, in the structure of the present embodiment, the welding operation can be performed more easily than in the case where both ends of the conventional S-shaped pipe are welded to the muffler body.

An expansion space portion 120 having a two-wall structure of an inner peripheral wall 118 and an outer peripheral wall 119 is formed in the outer peripheral portion of the front muffler main body 95a. This inner peripheral wall 118 is the first
The front inner peripheral wall 118a surrounding the expansion chamber A1 and the rear inner peripheral wall 118b surrounding the third and second expansion chambers A3 and A2 are divided into two parts. The rear end of the front inner peripheral wall 118a is the first partition 1
The front end is fixed to 10 a and is movable in the axial direction with respect to the annular slide member 121 fixed to the outer peripheral wall 119. Thereby, the difference in thermal expansion with the outer peripheral wall 119 can be absorbed. The space between the front inner peripheral wall 118a and the outer peripheral wall 119 is filled with the above-described glass wool 116 as a heat insulating material and a sound deadening material.

The third expansion chamber A of the inner peripheral wall 118b
3 is a rectangular inflow hole 12 extending in the axial direction.
2 is formed, and the inflow hole 122 of the inner peripheral wall 118b is formed.
Outflow holes 123 of the same size are formed on the lower side.

The inflow hole 122 and the outflow hole 123 are formed inside the vehicle body.
Even if 9 is discolored, it will not be seen from the outside, preventing deterioration of appearance.

The inflow hole 122 is provided with the upper second pipe 1.
The discharge port 113c of 13a is close, while the first pipe 112 is close to the outlet 123 so as to cover the outlet 123 over the entire length. Thereby, the inflow hole 1
High-pressure exhaust gas flows from the second pipe 113 a into the vicinity of the outlet 22, while the high-pressure exhaust gas hardly flows into the vicinity of the outflow hole 123. Therefore, the inflow hole 1
The pressure around 22 is higher than the pressure around the outlet 123.

As a result, the discharge port 1 of the second pipe 113a
Part of the exhaust gas flowing into the third expansion chamber A3 from 13c flows into the expansion space 120 through the inflow hole 122, and flows out of the outflow hole 123 into the third expansion chamber A3 through the expansion space 120. (Refer to mark a in FIG. 33).

The operation and effect of the muffler structure of this embodiment will be described. According to the present embodiment, the muffler body 95a,
The space between the outer peripheral wall 119 and the inner peripheral wall 118 is used as the expansion space 120 at the outer peripheral portion of the inner peripheral wall 95b.
Since the inflow hole 122 is formed at a portion facing the third expansion chamber A3, a part of the exhaust gas flowing into the third expansion chamber A3 flows into the expansion space 120 and expands, and the expansion space 12 expands.
Since 0 functions as an expansion chamber, the expansion chamber capacity can be increased, and the exhaust noise can be reduced accordingly.

Further, in the present embodiment, when the expansion space 120 is used as the expansion capacity, the second inflow hole 122 is formed in the inflow hole 122.
Since the discharge port 113c of the pipe 113a was brought close to the first pipe 112 so as to cover the outlet 123, the second pipe 11 was placed near the inlet 122.
Due to the exhaust gas discharged from 3a, the pressure becomes higher than in the vicinity of the outflow hole 123, whereby the flow of the exhaust gas discharged from the inflow hole 122 through the expansion space 120 through the outflow hole 123 can be formed. The air flows smoothly without stagnation in the inside 120, so that the exhaust noise can be reduced while suppressing the influence of the exhaust heat.

Further, since the inflow hole 122 and the outflow hole 123 are formed in the inner portion of the inner peripheral wall 118 in the vehicle width direction, even if the outer peripheral wall 119 is burned and discolored by the exhaust gas flowing into the expansion space 120, The discolored portion is not visible from the outside, and the appearance does not deteriorate.

In the above embodiment, the third expansion chamber A3
Although the inflow hole and the outflow hole are provided on the inner peripheral wall of the second expansion chamber, they may be provided in the second expansion chamber. In this case, the discharge port of the first pipe 112 may be arranged close to the inflow hole, and the third pipe 114 may be inserted into a position close to the outflow hole.

Next, the air cleaner device of the motorcycle 1 will be described with reference to FIGS. A left and right pair of carburetors 12 are provided in the V bank of the engine unit 5.
6,126 are arranged in parallel. The right carburetor 126 is connected to an intake port on the rear wall of the front cylinder head 22a via a front cab joint 127a.
The left carburetor 126 is the rear cab joint 127
b, it is connected to an intake port on the front wall of the rear cylinder head 22b.

The air cleaner device 125 has a two-part structure including a cleaner main body 128 and a silencer section 129. The cleaner main body 128 is exposed outward to the right side of the vehicle body facing the V bank of the engine unit 5. (See FIG. 3), and the silencer section 129 is disposed on the lower surface of the fuel tank 7 in the V bank. A recess 7 c is formed in the bottom wall of the fuel tank 7, and the recess 7 c
The silencer section 129 is housed inside, so that the structure is invisible from the outside (see FIG. 36).

The silencer section 129 has a bottom 129a.
The main body 129b has a substantially rectangular cross section and is inclined so that the upper wall 129c becomes higher toward the front. As a result, the silencer 129 has a larger capacity toward the front.

Air intake ducts 130 and 131 are inserted and connected to the front end and the rear end of the bottom portion 129a, respectively, and the air intake openings 13 of the intake ducts 130 and 131 are provided.
Oa and 131a are connected to the upstream end of the carburetor 126 via intake pipes 132 and 132, respectively. A breather pipe 133 is provided at the front end of the bottom 129a.
Is connected.

The air intake ducts 130 and 131 are alternately arranged so as to be located on the left and right outside in the vehicle width direction in plan view, and the air intakes 130b and 131b of the intake ducts 130 and 131 are right and left. Is more oriented. This avoids interference of the air flows flowing into the two air intakes 130b and 131b.

An inlet 129d is formed to protrude downward at the front end of the bottom portion 129a, which is the maximum capacity portion of the silencer portion 129, and the downstream port 134a of the communication duct 134 is connected to the inlet 129d. I have.

The cleaner main body 128 is the case main body 1.
37, a generally bowl-shaped filter cover 138 is detachably mounted on the outside of the vehicle body, and a substantially bowl-shaped outside air introduction cover 139 is mounted inside the case main body 137. An air outlet 137a is formed at the upper end of the inner wall of the case body 137 so as to protrude inward.
Is connected to an upstream port 134b of the communication duct 134.

The case body 137 and the filter cover 1
38 form a substantially sealed cleaner chamber 128a, and the cleaner chamber 128a is connected to the air outlet 137a.
Is in communication with An air filter 140 is housed in the cleaner chamber 128a, and the air filter 140 is arranged so as to be coaxial with the axis C of the case main body 137. This air filter 140 has an arc portion 140a.
And a chord 140b, and are formed in a shape like a crushed part of a donut shape. The chord portion 140b can be provided in the air outlet 13 without increasing the size of the entire filter.
This is provided so as not to protrude into 7a. The air filter 140 can be replaced by removing the filter cover 138 to the outside of the vehicle body.

The outside air introduction cover 139 and the case body 1
37 form a substantially closed outside air introduction chamber 128b, and the outside air introduction chamber 128b and the cleaner chamber 128a are separated by a case body 137. A substantially fan-shaped outside air inlet 13 is provided at the rear end of the outside air introduction cover 139.
9a are formed.

On the outer wall of the outside air introduction cover 139, an eave-shaped windproof wall 139b covering the front, rear and upper sides of the outside air introduction port 139 is integrally formed. This windproof wall 13
9b extends along the rear edge of the outside air introduction port 139, extends obliquely downward along the upper edge from the upper end to the center, and further extends downward from the front end. As a result, substantially the entire periphery of the outside air inlet 139 except for the lower edge portion is surrounded by the windproof wall 139b.

A partition wall 139c is integrally formed on the inner surface of the outside air introduction cover 139. The partition wall 139c extends in an arc along the front edge of the outside air introduction port 139a, and the upper wall 139 of the outside air introduction cover 139.
d, and its height is the case body 137.
Is set so that a predetermined gap c is formed between the bottom surface and the bottom surface. As a result, the outside air inlet 139a and the air duct 141 described later are partitioned, and most of the air a flowing from the outside air inlet 139a flows into the air duct 141.
Is not short-circuited.

A drain hole 142 for removing moisture, dust, and the like accumulated in the outside air introduction chamber 128b is formed at the lower edge of the outside air introduction cover 139. A drain pipe 143 for communicating the cleaner chamber 128a with the outside is inserted into the outside air introduction cover 139.
The inner end of 43 is connected to a drainage boss 137d having a drainage hole 137e and protruding from the case body 137 so as to remove moisture, dust and the like in the cleaner chamber 128a. A plug 143a is removably inserted into the outer end opening of the drain pipe 143.

The case body 137 has the cleaner chamber 12.
The above-described air duct 141 that communicates the air passage 8a with the outside air introduction chamber 128b is provided. This air duct 141 is
The insertion hole 137 of the case body 137 is formed in a fitting groove 141 c formed in the outer peripheral wall of the duct 141.
It is supported by fitting the periphery of b. The air inlet 141b and the air outlet 141a of the air duct 141 are located substantially at the center of the outside air introduction chamber 128b and the cleaner chamber 128a in the axial direction, respectively.

The air inlet 1 of the air duct 141
41 b is the outside air inlet 1 with respect to the air filter 140.
It is arranged to be deviated in a direction away from 39a. That is, the air duct 141 is disposed such that its axis C1 is eccentric to the front of the axis C of the air filter 140. Thus, the air outlet 141a of the air duct 141 is close to the front part of the arc part 140a and the chord part 140b of the air filter 140, and is separated from the rear part and lower part of the arc part 140a. The end face of the air outlet 141 a of the air duct 141 is located in the middle of the air filter 140 in the axial direction. That is, the air duct 141 protrudes into the air filter 140 by the dimension b, so that the air duct 141 is positioned so as to overlap with the air filter 140 when viewed in the flow of air. Distance (gap) between 141 and air filter 140
Is smaller, the substantial air filter area is smaller.

The operation and effect of the air cleaner of the present embodiment will be described. In the present embodiment, the outside air introduction chamber 128
b and the air inlet 141b of the air duct 141 communicating the cleaner chamber 128a with respect to the air filter 140 in a direction away from the outside air inlet 139a.
Since the outside air introduction port 139a is separated from the air duct 141, the outside air introduction chamber 128b
The air-water separation function in the inside can be enhanced, and the inflow of moisture to the air filter 140 side can be suppressed.

Further, since the above-mentioned improvement of the water / water separation function is realized by a structure in which the air duct 141 is merely separated from the outside air inlet 139a, it is not necessary to increase the capacity of the outside air introduction chamber 128b, and it is possible to avoid a large case. As well as avoiding deterioration of appearance.

The air duct 1 having the air outlet 137a located on one side of the air filter 140 as in the present embodiment.
Most of the air a introduced from 41 into the cleaner chamber 128a passes intensively through the portion closest to the air outlet 137a of the air filter 140, and the air passes through only a part of the air filter, and passes through the entire air filter. There is a possibility that it cannot be used effectively.

However, in this embodiment, the filter 14
The air duct 141 is located close to the portion near the air outlet 137a, but the air duct 141 is located close to the portion, and the projecting portion b in the cleaner chamber 128a of the duct 141 substantially corresponds to the portion. The effective filter area is reduced.
On the other hand, the portion of the filter 140 far from the air outlet 137a has a long flow path length, but the effective area of the filter is not substantially reduced because the air duct 141 is located far away.

After all, in this embodiment, the total air resistance becomes substantially uniform over the entire circumference of the filter. As a result, the air “a” passes evenly through the entire air filter 140 without being biased toward a portion near the air outlet 137a of the air filter 140, and can be used for a long time.

In this embodiment, the outside air introduction chamber 128b
Since the partition wall 139c is provided between the outside air inlet 139a and the air inlet 141b of the air duct 141, the air a introduced from the outside air inlet 139a allows the air a to be introduced into the air inlet 141.
b can be prevented, the water / water separation in the outside air introduction chamber 128b can be promoted, and the inflow of moisture into the air filter 140 can be further prevented.

In this embodiment, the outside air introduction cover 13 is provided.
Since the windbreak wall 139b is formed substantially all around except for the lower edge portion of the outside air inlet 139a, it is possible to prevent moisture, rainwater, and the like contained in the traveling wind from directly entering the outside air inlet 139a.

In this embodiment, since the air cleaner device is divided into the cleaner main body 128 and the silencer section 129, the moisture in the air is separated by the cleaner main body 128 and the silencer section 129, and the air / water separation function is further improved. Can be enhanced.

Since the silencer section 129 is housed in the recess 7c of the fuel tank 7, the cleaner main body 128 can be made compact while securing the required capacity as a whole, and has a good appearance when mounted on an engine having a large displacement. Can be improved.

The upper wall 12 of the silencer section 129 is
Since the large-capacity portion is formed by inclining 9c so as to be higher toward the front side, and the air inlet 129d is connected to the large-capacity portion, the flow rate of the intake air flowing into the silencer portion 129 decreases immediately. The intake noise can be reduced.

An air intake duct 130 for supplying air to the carburetor 126 before and after the silencer section 129,
131 and the left and right sides are alternately arranged, so that interference between the inflowing airs can be prevented as compared with the case where they are arranged in the same direction, and the cylinders can be uniformly sucked.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a motorcycle according to an embodiment of the present invention.

FIG. 2 is a plan view of the motorcycle.

FIG. 3 is a front view of the motorcycle.

FIG. 4 is a side view of a rear arm of the motorcycle.

FIG. 5 is a plan view of an engine unit and a shaft drive mechanism of the motorcycle.

FIG. 6 is a side view of the engine unit.

FIG. 7 is a side view of a unit case cover of the engine unit.

FIG. 8 is a view showing a cap of the unit case cover.

9 is a sectional view of the unit case cover (a sectional view taken along line IX-IX in FIG. 7).

FIG. 10 is a plan view showing a head cover of a cylinder head of the engine unit.

FIG. 11 is a sectional front view of the head cover.

FIG. 12 is a plan view of a plug-side cover of the head cover.

FIG. 13 is a side view of the plug-side cover.

FIG. 14 is a plan view of a cover bracket of the plug-side cover.

FIG. 15 is a side view of the cover bracket.

FIG. 16 is a plan view of a fixed side cover of the head cover.

17 is a partial cross-sectional view of the fixed side cover (FIG. 1)
XVII-XVII sectional view of No. 6).

FIG. 18 is a plan view of a cover bracket of the fixed side cover.

FIG. 19 is a side view of the cover bracket.

FIG. 20 is a sectional view of a rear wheel-side input portion of the shaft drive mechanism.

FIG. 21 is a sectional view of an engine-side output portion of the shaft drive mechanism.

FIG. 22 is a rear view for explaining a vehicle speed detecting device provided in the engine-side output unit.

FIG. 23 is a cross-sectional view for explaining a starting device of the engine unit.

FIG. 24 is a side view of a crankcase of the engine unit.

FIG. 25 is a view showing a damper mechanism of the starting device.

FIG. 26 is a sectional view of a rotor boss portion and a drive gear of the starting device.

FIG. 27 is a side view for explaining a secondary air supply device for the motorcycle.

FIG. 28 is a plan view of the secondary air supply device.

FIG. 29 is a plan view of a supply pipe of the secondary air supply device as viewed from a plane.

FIG. 30 is a wiring diagram viewed from the side of the supply pipe.

FIG. 31 is a cross-sectional view for explaining a muffler structure of the motorcycle.

FIG. 32 is a sectional view of a third expansion chamber portion of the muffler body.

FIG. 33 is a cross-sectional view of the muffler main body viewed from an axial direction.

FIG. 34 is a cross-sectional view of the muffler main body viewed from an axial direction.

FIG. 35 is a cross-sectional side view for explaining the air cleaner device for the motorcycle.

36 is a sectional front view of the motorcycle air cleaner device (a sectional view taken along line XXXVI-XXXVI in FIG. 35).

FIG. 37 is a side view of the air cleaner device as viewed from inside a cleaner main body.

FIG. 38 is a sectional view of the cleaner main body (see FIG. 37);
XXVIII-XXVIII section view).

FIG. 39 is a sectional view of the cleaner main body (see FIG. 37);
XXXIX-XXXIX section view).

FIG. 40 is a plan view of a silencer section of the air cleaner device.

[Explanation of symbols]

125 air cleaner device 128a cleaner chamber 128b outside air introduction chamber 138 filter cover (filter case) 139 outside air introduction cover (outside air introduction case) 139a outside air introduction port 139b windproof wall 139c partition wall 140 air filter 141 air duct 141b air inlet

Claims (4)

[Claims] 1. A filter case having a cleaner chamber in which an air filter is stored, an outside air introduction case having an outside air introduction chamber for introducing outside air from an outside air introduction port, and an air filter primary side of the outside air introduction chamber and the cleaner chamber. Air cleaner device for a motorcycle, comprising: an air duct communicating with the air duct; wherein an air inlet of the air duct is displaced in a direction away from the outside air inlet with respect to the air filter. apparatus. 2. An air discharge port according to claim 1, wherein an air duct protrudes into the air filter, and an air discharge port through which air filtered by the air filter flows out to the engine side is provided on a side where the air duct is deviated. An air cleaner device for a motorcycle, wherein the air cleaner device is located. 3. The external air introduction case according to claim 1, further comprising a partition wall in the external air introduction case for preventing air introduced from the external air introduction port from flowing into the air duct by short-circuit. Characteristic motorcycle air cleaner device. 4. The automatic air conditioner according to claim 1, wherein a windbreak wall is formed on an outer surface of the outside air introduction case to prevent a running wind from directly flowing into the outside air introduction port. Air cleaner for motorcycles.