JPH0910872A - Production of tube member - Google Patents

Abstract

PURPOSE: To provide a producing method of a tube member which improves the matching face precision of a tube member with a member to be joined and improves the reliability against the joining strength. CONSTITUTION: In a case of producing a tube member 25 to be used for joining mutual members to be joined having a curve face, a process to punch both ends of a flat plate 25' having the circumference directional extension dimension (a) of the tube member 25 into a shape (b') extended the contact face (b) of the members 12, 13 to be joined with the tube member 25, a forming process to form the flat plate 25' into a cylinder body and a process to weld mutual butt-matching parts 25a' of the formed cylinder body are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a pipe member used for connecting members to be connected having curved surfaces. The present invention will be described below by exemplifying a case of being applied to a vehicle body frame of a motorcycle.

As a body frame of a motorcycle, left and right frame pipes may be connected to each other by a cross pipe in order to improve rigidity, and further, body component parts may be bolted and fixed to the cross pipe.

When manufacturing such a body frame,
Conventionally, the method shown in FIGS. 51 and 52 has been adopted.
First, a pipe 402 corresponding to the size between the left and right frame pipes 401, 401 is prepared, and a curved surface 402a having a shape along the connection surface of the frame pipe 401 is cut on both end faces of the pipe 402. Next, a positioning hole 402b, a drain hole 402c, etc. are drilled in the pipe 402,
Thus, the cross pipe 403 is manufactured. Then, the cross pipe 403 is arranged such that both curved surfaces 402a of the cross pipe 403 are in contact with the surface to be connected of the frame pipe 401, and positioning is performed by a jig through the positioning hole 402b.
In this state, the frame pipe 401 is welded. Thereafter, the frame pipe 401 is dipped in a paint bath to prevent rust, and then the paint liquid that has entered the cross pipe 403 is discharged from the water drain hole 402c.

In the case of forming a mounting portion for the above-mentioned vehicle body component on the cross pipe 402 manufactured by the above method, conventionally, as shown in FIGS. 53 and 54, a U-shaped sheet metal support piece 406 is first used. And press-molding the supporting piece 406
A mounting seat 407 is formed by welding a nut (not shown) on the back surface of the above so as to be coaxial with the nut hole 406a, and the mounting seat 407 is welded to the outer surface of the cross pipe 402. Then, a vehicle body component 408 is attached to the mounting seat 407.
Will be bolted and fixed.

[0005]

However, in the above-mentioned conventional manufacturing method, the dimensional accuracy when cutting the curved surfaces at both ends of the pipe is low, and as a result, it is difficult to obtain the mating surface accuracy between the frame pipe and the cross pipe. There is a problem.
In particular, when the above-mentioned cutting is performed by punching, it is impossible to cut a complicated shape. Therefore, reliability of connection strength is low, and improvement in securing rigidity of the entire body frame is required.

Further, in the above-mentioned conventional method, it is necessary to form a positioning hole and a drain hole in the pipe,
Furthermore, there is a problem that the mounting seat must be separately prepared, which increases the cost. Further, since the above-mentioned mounting seat travels from the upper surface of the cross pipe, the space for mounting the parts is reduced accordingly.

The present invention has been made in view of the above-mentioned conventional situation, and manufactures a pipe member which can improve the accuracy of the mating surface with the member to be connected to improve the reliability of the connection strength and reduce the manufacturing cost. It is intended to provide a way.

[0008]

According to a first aspect of the present invention, in a method of manufacturing a pipe member used for connecting members to be connected having curved surfaces, a connection side end of a flat plate having a circumferential expansion dimension of the pipe member. A cutting step of cutting the portion into a shape in which the contact surfaces of the connected member and the pipe member are expanded, a molding step of molding the cut flat plate into a tubular body, and a butting portion of the molded tubular body. It is characterized by having a pipe welding process for welding. In the above cutting step, the flat plate may be cut into the circumferential dimension of the pipe member.

According to a second aspect of the present invention, in the first aspect of the present invention, a step of forming a nut hole in the flat plate, and a nut that is coaxial with the nut hole on one surface that is an inner surface when the flat plate is formed into a cylindrical body. And a flat surface forming step of forming a flat surface portion on the nut mounting portion of the flat plate at the time of forming the tubular body. In addition,
The nut hole drilling may be performed at the same time when the connection end is cut.

[0010]

In order to manufacture the pipe member of the present invention, first, a flat plate having a circumferential expansion dimension of the pipe member is prepared, and both ends of the flat plate are punched into a shape in which the contact surface with the member to be connected is expanded. Etc. Next, the flat plate is subjected to a winding process so that the cut portions are located at both ends to form a tubular body,
After this, the butted portions of the flat plates are welded to each other.

According to the manufacturing method of the first aspect of the present invention, since both ends of the flat plate are cut into a developed shape along the contact surface with the member to be connected, the shape of the connecting portion of the pipe member can be freely set. Therefore, the accuracy of the mating surface with the connected member can be improved. As a result, the reliability of the connection strength can be improved, and the frame rigidity when connecting the vehicle body frames to each other can be ensured.

According to the second aspect of the present invention, a nut hole is formed at the same time as the punching of the flat plate or by shifting with time, a nut is welded to the inner surface of the flat plate so as to be coaxial with the nut hole, and a nut of the flat plate is formed. Since the flat portion is formed in the portion, the conventional supporting piece for attaching the nut can be eliminated, and the welding process of the supporting piece can be eliminated. Further, since it is possible to eliminate the need for drilling a nut hole in a separate process, the manufacturing cost can be reduced. Further, since the nut is arranged on the inner surface of the pipe member and the flat portion is formed on the nut portion of the pipe member, the conventional protrusion can be eliminated, and the mounting space can be expanded accordingly.
Furthermore, the mounting area to the pipe member can be secured.

When the nut hole is formed in the flat plate, the positioning hole and the water draining hole can be formed at the same time, and the positions of the holes can be set in advance. Therefore, the dimensional accuracy is improved from this point as well. The cost can be reduced at the same time.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 47 are views for explaining a scooter type motorcycle according to an embodiment of the present invention.
Is a left side view of the motorcycle, FIG. 2 is a left side view showing the suspension portion of the power unit, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIGS. 4 to 6 are for explaining the pipe manufacturing method. FIG. 7 is a left side view of the steering device, FIG. 8 is a cross-sectional view showing a handle mounting portion, and FIGS. 9 to 13 are plan views, left side views, rear views, right side views, and one view of the power unit, respectively. Partial cross-sectional plan views, FIGS. 14 to 17 are left side views, plan views, front views and plan views, respectively, showing a radiator arrangement structure, FIG. 18 is a front view of a vehicle body cover, FIG. 19 is a left side view of a front frame, 20 is a left side view showing a cooling structure of a radiator, FIG. 21 is a sectional side view of a front cover, FIG. 22 is a rear view of a leg shield, FIG. 23 is a sectional view of a main switch portion, and FIGS. Sectional view for explaining the device 27 and 28 are plan views and sectional views of the footboat, FIGS. 29 and 30 are left side views and sectional rear views of the side covers, FIGS. 31 and 32 are sectional views and side views of the grab bar, and FIG. 33 is a seat rear portion. Is a partial sectional view showing
FIG. 34 is a left side view showing the rear carrier, FIGS.
42 is a perspective view, a side view, a plan view, a sectional side view, a partial sectional side view for explaining the seat device, FIG. 40 is an exploded perspective view of the fuel lid, FIG. 41 is a configuration diagram showing the operation of the gas damper, and FIG. -FIG. 45 is a plan view for explaining the stand device, a left side view, a schematic configuration view, and a schematic view, respectively. FIG. 46 is a cross-sectional view of the seat hinge bracket, and FIG.
7 is a conceptual diagram showing the operation of the stand body. The left, right, front and rear of the present embodiment refer to the left, right, front and rear as seen in the riding state.

In FIG. 1, reference numeral 1 denotes a scooter type motorcycle according to the present embodiment, in which a swing type power unit 3 is pivotally supported at a substantially central lower portion of a vehicle body frame 2 and a seat 4 is mounted on an upper portion thereof. It has a schematic structure in which the periphery is surrounded by a vehicle body cover 1a.

The vehicle body cover 1a is made of resin and comprises a front cover 6 and a leg shield 7, and a front vehicle body cover 6'which surrounds the outer peripheral portion of the head pipe 5 of the vehicle body frame 2 and the leg shield 7. And a footboard 8 which is disposed below the floor and constitutes a footrest section, and the footboard 8
And an under cover 9 disposed on the lower surface of the seat 4, and a side cover 10 that covers the upper part of the power unit 3 from the lower left and lower right of the seat 4.

The body frame 2 has the following structure. At the center of the head pipe 5, a single main frame 11 extending obliquely downward and rearward of the vehicle body is connected. The front ends of a pair of left and right side frames 12, 12 are connected to the lower end of the main frame 11, and each side frame 12 extends diagonally downward to the rear of the vehicle body.
It extends rearward in a substantially horizontal straight line.

Below the main frame 11 of the head pipe 5, a pair of left and right down tubes 13, 1 are provided.
The front ends of 3 are connected. This each down tube 13
Is an inclined portion (front side portion) 13a that extends downward to the rear of the vehicle body,
It is composed of a linear portion (lower portion) 13b that extends substantially horizontally in a rearward direction from the lower end of the inclined portion 13a, and a bent portion 13c that extends obliquely upward from the rear end of the linear portion 13b.

The rear end portion 12a of each side frame 12
And the bent portion 13c of each down tube 13 are integrally connected and fixed by a suspension bracket 14. A front end of a rear frame 15 that extends rearward in a substantially straight line is connected to each suspension bracket 14, and an upper surface of the rear frame 15 extends rearward and obliquely upward from the front end of the frame 15 and then extends substantially vertically downward. A support pipe 16 extending to the is connected.

Between the upper parts of the left and right suspension brackets 14, a suspension link 17 having a substantially U shape in a plan view is installed, and the left and right arm portions 17a, 1 of the suspension link 17 are provided.
7a is fastened by a bolt 19 with a rubber damper 18 interposed in the suspension bracket 14. This suspension link 1
The power unit 3 is attached to the base 17b of the pivot shaft 20.
Is pivotally supported by the pivot shaft 2 by means of
A rubber bush 21 is press-fitted between 0 and the suspension link 17.

The suspension bracket 14 and the right end portion of the pivot shaft 20 are connected by a single compression rod 22. The compression rod 22 is formed by connecting cylindrical members 22b and 22c to both ends of a rod member 22a. The cylindrical member 22b on one side is fixed to the lower portion of the suspension bracket 14 by a bolt 23 and the cylindrical member 22c on the other side. Is fixed to the pivot shaft 20.
The rear end 12a of the side frame 12 is connected between the bolts 23 and 19 of the suspension bracket 14, and the connection of the side frame 12 improves the rigidity with respect to the longitudinal force. In addition, the cylindrical members 22b,
A rubber bush 24 is interposed between the bolt 22 and the bolt 23 and the pivot shaft 20, and a circumferentially extending void 24a is formed at the center of the rubber bush 24 in the radial direction. As a result, the spring constant changes according to the input during acceleration / deceleration, etc., and the engine behavior due to driving and braking is prevented while improving the vibration isolation.

The bent portions of the side frame 12 and the down tube 13 are connected by a vertical pipe 25, and the bent portions of the left and right side frames 12 and straight portions are connected by a horizontal pipe 26. The vertical pipe 25 is a flat plate 25 punched by a press.
′ Is formed into a cylindrical body.

That is, as shown in FIGS. 4 to 6, a flat plate 25 'having a circumferential expansion dimension (peripheral length) a of the vertical pipe 25.
Prepare the above side frame 12, down tube 1
The left and right ends of the flat plate 25 'are punched out so that the contact surface b between the vertical pipe 25 and the vertical pipe 25 is formed into a shape b', and the flat plate 25 'is formed into a cylindrical body.
It is manufactured by welding 'and 25a' to each other. Further, the vertical pipe 25 has a jig hole 25b and a water drain hole 25c.
The holes 25b and 25c are formed at the same time when the both ends of the flat plate 25 'are punched. It is of course possible to prepare a plate having a width larger than the perimeter a as the flat plate 25 'and punch it to the dimension a at the same time as the punching on the left and right end portions. Also, the horizontal pipe 2 above
6 is also manufactured in the same manner as the vertical pipe 25.

Next, the steering system of this embodiment will be described. A steering shaft 30 is inserted in the head pipe 5. The steering shaft 30
Are bearings 31 arranged at the upper and lower ends of the head pipe 5,
The upper bearing 31 is rotatably supported by 31, and is fastened and fixed by a double nut 32 screwed to the steering shaft 30. A front fork 33 is fixed to the lower end of the steering shaft 30, and a front wheel 34 is pivotally supported by the lower end of the front fork 33.

A steering handle 35 is mounted on the upper end of the steering shaft 30. The steering handle 35 is configured by bolting and fixing a roughly U-shaped handle body 37 to a handle holder 36 which is composed of an upper holder 36b and an under holder 36a and which is divided into upper and lower halves. The underholder 36a is the steering shaft 3
A handle fixing seat 36d is integrally formed with a cylindrical fixing portion 36c through which the upper portion of 0 is inserted, and a female taper surface 38a is formed on the inner peripheral surface of the upper portion of the steering shaft mounting hole 38 of the fixing portion 36c. There is. Further, the female taper surface 38a is formed on the outer peripheral surface of the upper end portion of the steering shaft 30.
Is formed with a male taper surface 39 that is fitted to the, and is prevented from rotating by a hemispherical coupling key 40. A nut 41 is screwed onto the upper end of the steering shaft 30, and the under holder 36a is fastened and fixed by the nut 41. In addition, 40a is a key insertion groove.

The upper portion of the steering shaft 30 is inserted into a through hole 42 formed in the upper mating surface of the leg shield 7 and projects into the handle cover 43. The through hole 42 has a diameter larger than that of the double nut 32, and is covered with the lower surface of the handle cover 43 with a slight clearance a. The handle cover 43 is substantially U-shaped along the handle body 37 in a front view.

Right and left grips 4 of the steering handle 35
A front wheel disc brake lever (not shown) and a rear wheel drum brake lever 45 are mounted on each of the wheels 4, and a handle switch 46 such as a horn and a turn signal is mounted on the left grip 44. Among them, the front wheel brake hose, the handle switch lead wire and the like are arranged in the handle cover 43. The rear wheel brake cable 47 is routed outside the handle cover 43, and is routed along the down tube 13 in the front cover 6 through the outside front of the handle cover 43. The rear wheel brake cable 47 is supported by guide clamps (not shown) attached to the lower portion of the inclined portion 13a of the down tube 13 and the rear portion of the straight portion 13b so as to be movable back and forth. Is the power unit 3
It is fixed to the front end. By thus arranging the rear wheel brake cable 47 on the outside of the handle cover 43, it is possible to avoid the local bending and to increase the bending R of the cable 47, and to reduce the sliding resistance during brake operation. . Further, since the handle cover 43 can be made compact, the appearance can be improved, and the visibility of various meters arranged on the front cover 6 described later can be improved. Further, since the rear wheel brake cable 47 is routed along the down tube 13 and the rear end portion is fixed to the power unit 3, the longitudinal movement of the cable caused by the vertical swing of the unit 3 can be smoothly absorbed. You can

The swing type power unit 3 is formed by integrally connecting a V belt drive type continuously variable transmission 51 to an engine body 50, and a rear wheel 52 is pivotally supported at a rear end portion of the power unit 3. .. A lower end of a rear cushion 53 is pivotally supported on the rear end of the power unit 3, and an upper end of the rear cushion 53 is pivotally supported on the rear frame 15 via a mounting bracket 54.

The engine body 50 is a water-cooled 4-cycle single-cylinder engine in which the cylinder axis of the cylinder block 5 is tilted forward.
6, the cylinder head 57 is laminated and fastened with bolts, and the piston 5 is inserted in the cylinder bore of the cylinder block 56.
8 is slidably inserted, and the piston 58 is connected to a crank pin 61 of a crank shaft 60 by a connecting rod 59. An intake port 62 and an exhaust port 63 are opened in the combustion concave portion 57a formed on the mating surface of the cylinder head 57, and an intake valve 64 and an exhaust valve 65 for opening and closing the intake port 62 and the exhaust port 63 are arranged in the respective openings. There is. A cam shaft 66 for pressing and driving the intake valve 64 and the exhaust valve 65 is arranged at the upper ends thereof, and the cam shaft 66 is rotationally driven by the crank shaft 60 via a timing chain 67. Reference numeral 68 is an auto tensioner that automatically adjusts the tension of the timing chain 67.

An exhaust pipe 48 is connected to the exhaust port 63 on the lower wall of the cylinder head 57. The exhaust pipe 48 is led out to the right side of the vehicle body and extends rearward from it. (Not shown) is connected. Further, a carburetor 49 is connected to an intake port 62 on the upper wall of the cylinder head 57 via an intake pipe, and the carburetor 49 is fixed to the upper wall of the cylinder block 56 (see FIGS. 14 and 15). An air cleaner (not shown) arranged on the transmission case on the left side of the vehicle body is connected to the carburetor 49.

A generator 69 is mounted on the right end of the crankshaft 60, and a drive pulley 70 of the continuously variable transmission 51 is mounted on the left end. Generator 6 above
A ring gear 71 is mounted inside 9 through a one-way clutch (not shown), and an output gear 72a of a starter motor 72 arranged on the upper surface of the crankcase 55 has a reduction gear 73 attached to the ring gear 71. Mesh through.

A cooling water pump drive shaft 74 is disposed in the lower portion of the crankcase 55, and an oil pump drive shaft 75 is disposed between the drive shaft 74 and the crankshaft 60 in parallel with the crankshaft 60. There is. The crankshaft 60
A drive gear 76 is mounted inside the ring gear 71, and the drive gear 76 is located on the opposite side of the drive pulley 70. A cooling water pump drive gear 78 meshes with the drive gear 76 via an idler gear 77, and the oil pump drive shaft 75 is fixed to the idler gear 77. The oil pump 79 is arranged in the lower central part of the crankcase 55 on the side opposite to the drive pulley 70, and the cooling water pump 80 is arranged on the lower outer wall of the crankcase 55 on the drive pulley 70 side.

A rotary filter 82 is mounted between the right bearing 81 of the crankshaft 60 and the crank web 60a to filter impurities of the lubricating oil. On the right side of the crankshaft 60, a main oil passage 83 extending in the axial direction, and a first oil passage 84 extending in the radial direction from the inner end of the main oil passage 83 and communicating with the inlet of the rotary filter 82 are provided. A second oil passage 85 extending obliquely from the outlet of the rotary filter 82 toward the crank pin 61 is formed.

The lubricating oil path of the engine unit 50 has the following structure. Lubricating oil sucked by the oil pump 79 from the oil pan 86 formed in the lower portion of the crankcase 55 is pressure-fed to the main gallery 87 integrally formed in the crankcase 55, and from there to the crankshaft path and the camshaft path. Branched. In the crankshaft path, from the main gallery 87 to the crankcase 5
5, an oil passage 89 formed integrally with the inner wall of the crankcase 5, and a crankcase cover 88 mounted on the right mating surface of the case 55.
Is sent under pressure to an oil chamber 90c through oil passages 90a and 90b formed integrally with the outer wall of the. And the oil chamber 90
From c to the rotary filter 82 through the main oil passage 83 and the first oil passage 84 of the crankshaft 60, and through the second oil passage 85 from the crank pin 61 to the large end portion, the piston sliding surface, and the like. It is supplied and then collected in the oil pan 86. Further, in the cam shaft path, the lubricating oil hole 9 of the cylinder head 57 is passed from the main gallery 87 through an insertion hole (not shown) of a head bolt for fixing the cylinder head and the cylinder to the crankcase.
It is pressure fed from 1a to the oil chamber 91b. Then, the oil is supplied from the oil chamber 91b to the cam sliding surface and the like through oil holes 66a and 66b formed so as to communicate with the shaft center of the cam shaft 66 and in the direction orthogonal to the shaft. The oil is supplied to the chain chamber 93 and then collected in the oil pan 86 (see the → mark in FIGS. 12 and 13).

Since the rotary filter 82 is arranged between the crank web 60a of the crankshaft 60 and the right bearing 81 as described above, the filter 82 is not connected to the crank pin 6
The second oil passage 85 to 1 can be formed by one straight hole extending in the radial direction, the number of oil passages to be processed can be reduced, and the processing cost can be reduced. By the way, conventionally, the rotary filter is arranged outside the bearing, and therefore, two oil passages for communicating the filter and the crank pin, that is, a hole extending in the axial direction and a hole extending in the radial direction, are required. .

The crankcase 55 has a left-right split structure, and the left crankcase 55a is integrally formed with a transmission case body 94 which constitutes an inner wall surface of the transmission case. A transmission case cover 95, which constitutes an outer wall surface of the transmission case, is fixed to the mating surface of the case body 94 by bolts, whereby a belt chamber V is formed. The drive pulley 70 and the driven pulley 97 supported by a driven shaft 96 are arranged at the front of the belt chamber V, and a V belt 98 is wound between the pulleys 70 and 97. . The inner sheave 70a of the drive pulley 70 is configured to move in the axial direction by the centrifugal force acting on the weight 99. A centrifugal clutch 100 is mounted on the left side of the driven shaft 96, and a rear wheel shaft 102 is connected to the driven shaft 96 via an intermediate shaft 101.

When viewed from the side, the transmission case body 94,
The portion b between the pulleys 70 and 97 of the transmission case cover 95 is formed so as to bulge above and below the size required for disposing the V-belt 98, so that even if the V-belt 98 swings up and down, the case It does not hit the inner wall, preventing fluttering noise and preventing damage due to contact.

On the outside of the transmission case cover 95, a resin case cover 104 for suppressing outward diffusion of noise generated in the case is mounted. The resin case cover 1
Reference numeral 04 denotes a structure in which the front cover 105 and the rear cover 106 are divided into two. A recess 95a that is recessed toward the drive pulley 70 is formed in the front part of the transmission case cover 95, and the space formed by the recess 95a and the front part of the front cover 105 is a cleaner box 107. Further, an intake 103 for introducing cooling air from the cleaner box 107 into the belt chamber V is formed in the recess 95a of the transmission case cover 95, and the inlet 103 is provided between the peripheral edge of the intake 103 and the front cover 105. The element 108 is arranged in a sandwiched state, and the front cover 105 and the recess 95a are bolted and fixed.

The rear end portion of the front cover 105 is extended rearward so as to cover the front outer side of the rear cover 106. A suction port 109 for introducing cooling air into the cleaner box 107 is integrally formed at the rear end of the extension part, and a bifurcated rat return part 109a is integrally formed at the opening edge of the suction port 109. There is. A plurality of ribs 105a are arranged in the opening of the suction port 109 at intervals in the vertical direction and are inclined downward.
Is integrally formed with the front cover 105. This prevents water, dust, etc. from entering the cleaner box 107 through the suction port 109.

A radiator 116 is arranged at the front of the vehicle body frame 2. This radiator 116 has a structure in which tank portions 116b are arranged on the left and right sides of the core portion 116a and an electric fan 117 is arranged on the rear surface. The radiator 116 is arranged on the rear side of the inclined portion (vertical side portion) 13a of the left and right down tubes 13 and in the front portion of the center tunnel 8a of the footboard 8, which will be described later. Each tank part 1
16b is arranged so as to overlap the inclined portion 13a in a front view of the vehicle body.

The lower end of the water supply hose 118 is connected to the upper surface of the right tank section 116b, and the water supply hose 11 is connected.
A water inlet 118a at the upper end of 8 is disposed on the left side of the head pipe 5, and a radiator cap 119 is attached to the water inlet 118a. The front end of the cooling water supply hose 120 is connected to the lower end of the left side tank portion 116b, and the rear end of the supply hose 120 is connected to the suction port of the cooling water pump 80. A thermostat 80a is provided at the cooling water discharge port formed in the central portion of the upper surface of the cylinder head 57, and a return hose 121 is provided.
The rear end of the hose 121 is connected to the upper end of the right tank portion 116b. Note that 12
2 is a recovery tank for replenishing cooling water, which is arranged and fixed on the straight portion 13b of the right down tube 13.

Further, a cooling hose 123 for supplying a part of the cooling water to the carburetor 49 is connected to the cooling water discharge port formed on the right side of the upper surface of the cylinder head 57, whereby the carburetor of icing is used. Prevents malfunction. A cooling water return hose 124 is connected to the center of the front surface of the carburetor 49, and the return hose 124 is connected to the upstream end of the return hose 121. An air vent screw 115 is inserted in the cooling water passage (not shown) of the carburetor 49, and the screw 115 is installed in the radiator 11.
It is located at the top of all cooling water passages such as 6.

The cooling water path of the engine unit 50 has the following structure. The cooling water sucked from the radiator 116 by the cooling water pump 80 is supplied from the lower surface of the cylinder block 56 to a water jacket (not shown) formed on the peripheral wall of the cylinder block 56, and from there to a water jacket formed on the cylinder head 57. Supplied. The cooling water that has passed through this water jacket is returned from the cooling water discharge port of the cylinder head 57, the thermostat 80a, the return hose 121 to the tank portion 116b of the radiator 116, and is cooled by the core portion 116a. Is sucked in. On the other hand, part of the cooling water from the cylinder head 57 is partially cooled by the cooling hose 12.
3 is supplied to the cooling water passage in the carburetor 49, goes around a throttle valve (not shown), etc., and returns hose 12
4 to the return hose 121.

Next, the vehicle body cover 1a of this embodiment will be described in detail. The front side of the front cover 6 which constitutes the front body cover 6'is provided with a traveling wind introduction opening 1 on the left side and the right side.
25 is formed, and the peripheral edge of the opening is bent rearward of the vehicle body, thereby forming a cylindrical extension 125a. The extension 125a also functions as a reinforcing member that improves the rigidity of the lower portion of the front cover 6.

An inner fender 126 is provided in a portion of the front cover 6 facing the introduction opening 125, and the inner fender 126 is fixed to a lower bracket 129, a front frame 131 and the like.

The inner fender 126 has the left and right side walls 1.
It is a tunnel-shaped one consisting of 26a and the top wall 126b,
The front edge of the ceiling wall 126b is located above the extension portion 125a, and the rear portion is curved downward toward the radiator 116. An upper extension 9d of the under cover 9 is connected to the lower end of the ceiling wall 126b, and an inlet 9e is formed in the upper extension 9d. As a result, the inner fender 126 and the upper extension portion 9d are inserted into the introduction opening 12
The core part 1 of the radiator 116 receives the traveling wind introduced from
It has a function of guiding the air toward 16a and a mudguard function of preventing rainwater and mud from entering the front cover 6.

Below the front cover 6, there is a movable fender 34a that covers the front wheel 34 from above.
The traveling wind introduction port 9e is hidden behind the front wheel 34.
A downward fender recess 34b is formed in the central portion of the upper surface of the movable fender 34a, and an upward front recess 6b is formed in a portion of the lower surface of the front cover 6 facing the fender recess 34b. As a result, an introduction passage A for introducing traveling air is formed by the front concave portion 6b and the fender concave portion 34b.
The running wind is introduced into the radiator 116 at d.

A horn 127 is arranged below the inner fender 126 and at a position facing the traveling air introduction opening 125. The horn 127 is attached to a support member 128, and the support member 128 is fixed to a lower bracket 129 welded to the head pipe 5 through the top wall 126b of the inner fender 126. As a result, the horn sound is generated forward from the introduction opening 125.

Further, as shown in FIG. 20, a cooling air discharge port 9b is formed at the rear side portion of the radiator 116 on the bottom surface 9d of the under cover 9. Further, the air guide wall 9c extends from the rear edge of the upper exhaust port 9b toward the upper part of the radiator 116 while inclining obliquely upward.
The cooling air from the radiator 116 to the exhaust port 9b.
Function to guide you. This makes the radiator 11
6 is sucked by the negative pressure generated between the bottom surface 9d of the undercover 9 and the road surface, and the exhaust air 9 is discharged.
It is released from b.

An upper bracket 130 protruding forward is fixed to the upper portion of the head pipe 5 and a lower bracket 129 is fixed to the lower portion by welding. The front frames 131 made of steel pipe are attached to the brackets 129 and 130.
Has been fixed. The front frame 131 includes a front frame 132 that is bent and formed into a substantially C shape in a side view,
It comprises a rear frame 133 connected to the front frame 132, and the front cover 6 is bolted and fixed to the front frame 131.

The upper edge 6c of the front cover 6 is formed upright so as to have a substantially U shape when viewed from the front of the vehicle body, and the windshield which covers the front of the occupant along the outer edge of the upper edge 6c. Lower edge 134a of 134 is bolt 13
It is fixed by 4b. Also, the front cover 6
The headlight 13 is provided in the opening 6d formed at the center of the front end of the
5, the flasher lights 136 and 136 are mounted in the openings 6e formed at the upper left and right ends, and the lights 135 to 136 are arranged along the lower portion of the upper edge 6c. It is fixed to 6 by bolting.

The windshield 134 and the lights 135 to 136 are arranged close to the fixed portions 131a and 131b of the front cover 6 to the front frame 131, and the mounting portions of the respective parts of the front cover 6 are fixed. , And the periphery thereof are formed thicker than other portions, which are not shown, and ribs and the like are integrally formed. In this way, the windshield 134, the lights 135, 1
36, and various parts such as the equipment 137 to the front cover 6
The cover 6 is directly fixed to the front frame 131, and the fixing portion of the front cover 6 is arranged in the vicinity of each component. As a result, the weight of each part is reduced by the front cover 6 and the front frame 13.
1 can disperse and support, and strength and rigidity can be secured. Further, since each of the above components is directly fixed to the front cover 6, the mating surfaces of the components and the front cover 6 can be accurately aligned, and the appearance and the assembling property can be improved. That is, conventionally, each of the above-mentioned heavy parts is generally fixed to the frame. For this reason, there is a problem in that the fitting surface when mounting the front cover on the frame tends to cause the mating surfaces of the components and the front cover to be misaligned and the appearance to deteriorate, and also that the assembly work is troublesome.

Between the upper edge 6c of the front cover 6 and the upper edge of the headlight opening 6d, there is formed a maintenance opening 140 which is large enough for a human hand to insert, and the left side of the upper edge 6c. Then, maintenance openings 141 and 141 smaller than the opening 140 are formed in the lower right edge portion, respectively. A maintenance cover (trim cover) 142 formed by bending a strip plate into a substantially U shape is detachably attached to the front surface of the front cover 6.
The maintenance cover 142 allows the maintenance openings 140, 141 and the windshield 13 to be opened.
Each of the bolts 134b at the lower edge 134a of No. 4 is covered.
Here, in order to perform maintenance such as bulb replacement of the headlight 135, wiring of each meter, replacement of meter wires, etc., the maintenance cover 142 is removed, and a hand or a jig is inserted through the maintenance openings 140 and 141. To do. Aiming is performed by inserting a hand from the lower surface of the front cover 6 (see FIG. 21).

On the rear surface of the front cover 6, the leg shield 7 is provided with the upper bracket 130 of the head pipe 5.
The leg shield 7 is fixedly mounted on the leg shield 7
Is a vertical wall portion 7a constituting the storage portion, a tunnel portion 7b extending obliquely downward from the lower end of the vertical wall portion 7a, and the tunnel portion 7
It is composed of foot portions 7c, 7c which extend from the lower end of b to the left and right sides and which constitutes a part of the footrest portion, and the main frame 11 and the left and right side frames 12 are connected in the tunnel portion 7b. The part is located.

An inner panel 7h is provided on the upper end of the vertical wall 7a.
Are connected to each other, the through hole 42 is formed at the boundary between the inner panel 7h and the vertical wall 7a, and the inner panel 7h is provided with devices 137 such as a speedometer and a tachometer.

A mounting seat 7d is formed in a concave shape at a substantially central portion of the upper end of the vertical wall 7a so as to form a vertical surface, and a main switch 150 is disposed on the mounting seat 7d. As shown in FIGS. 23 (a) and 23 (b), an insertion hole 7e is formed in the mounting seat 7d, and a pair of engagement pieces 7f extending forward of the vehicle body are integrally formed on the peripheral edge of the insertion hole 7e. It is formed to project. The main switch 150 includes a key cylinder 150a and a switch cap 151 for displaying the on / off position of the cylinder 150a. The rear end of the key cylinder 150a is supported by the upper bracket 130 of the head pipe 5. Therefore, the key cylinder 150a is fixed to the bracket common to the leg shield 7.

The switch cap 151 is a cylindrical body 1.
A flange portion 151b is integrally formed at the front end of 51a, and a pair of projection pieces 151c is integrally formed at the rear end of the cylindrical body 151a. The switch cap 1
Reference numeral 51 designates the inner circumference of the flange portion 151b as the key cylinder 1
A protrusion 150c formed to extend in the axial direction in an engaging slit 151d formed in the cylindrical body 151a so as to extend in the axial direction while being fitted to a fitting portion 150b integrally formed on the front portion of 50a. Are fixed in the circumferential direction by engaging with. The flange 151b is in contact with the peripheral edge of the insertion hole 7e of the mounting seat 7d, and the protruding piece 151c is engaged with the engaging piece 7f of the mounting seat 7d. As a result, the switch cap 151 is fixed to the mounting seat 7d such that the axis of the switch cap 151 is perpendicular to the mounting wall 7d, and its movement in the axial direction is restricted.

Further, the flange portion 151b of the switch cap 151 has an ON position indicating the position of the key switch,
The characters OFF, OPEN, and LOCK are displayed.
The scooter of this embodiment adopts a constant lighting system in which the headlight is turned on when the key switch is turned to the ON position, and the seat lock is released when the key switch is turned to the OPEN position. When the key switch is turned to the OPEN position and then released, the key switch automatically returns to the OFF position. Therefore, in this embodiment, since the headlight is automatically turned off when the seat is opened, it is possible to prevent the battery from rising due to forgetting to turn off the light.

A storage device is provided in the leg shield 7. In this storage device, a box-shaped trunk recess 152 is integrally formed by bulging the right side portion of the vertical wall 7a of the leg shield 7 in the vehicle width direction toward the front of the vehicle body, and the left side portion of the vertical wall 7a is formed. Is cut out to form a trunk opening 153, and a separately formed trunk member 154 is disposed in the trunk opening 153.

The left end of the front wall 152a located in front of the trunk recess 152 is curved so as to surround the rear side of the head pipe 5, and the central portion of the top wall 152b is below the main switch 150. It is curved so as to surround the side. In addition, the bottom wall 1 of the trunk recess 152
An insertion hole 152d is formed in 52c, and the water inlet 118 having the cap 119 of the radiator 116 inserted through the insertion hole 152d in the trunk recess 152.
a is facing. The cap 15 is inserted into the insertion hole 152d.
5 is detachably arranged, and the cap 155 has an engaging claw 155 formed by cutting out a lower edge of the cap 155 in the axial direction.
It is mounted by engaging a with the peripheral edge of the insertion hole 152d.

The opening of the trunk member 154 is formed larger than the trunk opening 153. The lower edge 154a of the opening is below the lower edge of the trunk opening 153, and the upper edge 154b is the upper edge of the trunk opening 153. It is located above, and the left edge 154e has a trunk opening 15
It is located outside the left edge of 3. A flange portion 154c is integrally formed on the peripheral edge of the opening of the trunk member 154, and a plurality of bosses 154d are integrally formed on the flange portion 154c along the circumferential direction. This boss 1
A protrusion 156 integrally formed on the back surface of the leg shield 7 is fitted and inserted into the inside of 54d, and its tip end is welded, whereby the trunk member 154 is fixed to the leg shield 7. Also, the trunk member 154
The right end edge of is connected to the left end edge of the trunk recess 152 by welding the projection 156, whereby the trunk member 154 and the trunk recess 152 communicate with each other and are integrally connected.

A lid 157 for opening and closing both openings of the trunk recess 152 and the trunk opening 153 is provided. The lid 157 rotatably supports the lower edge of the lid 157 to the lower edge of the opening of the trunk recess 152 and the lower edge of the trunk opening 153 via a hinge 158, and locks the upper end of the center of the lid 157 with a locking member 159.
Is arranged. This locking member 159 is shown in FIG.
As shown in FIG. 6, the key cylinder 159a is attached to the holder 159.
It has a structure in which it is fastened and fixed to the lid 157 with b and a nut 160. Further, in the trunk concave portion 152, an engaging portion 1 formed by bending a ceiling wall 152b thereof downward
52f is formed, and a semicircular support concave portion 152g is formed in the rear portion of the engaging portion 152f through a notch hole. The lock claw 159c of the key cylinder 159a is releasably engaged with the engaging portion 152f, and the key cylinder 15 is engaged by the supporting recess 152g.
9a is restricted from moving in the circumferential direction.

As described above, in the above-described storage device, since the water supply port 118a of the radiator 116 is arranged in the trunk recess 152 in which the lid 157 with a key is arranged, it is possible to prevent mischief and facilitate the work of pouring cooling water. It can be carried out. Incidentally, in the case of arranging the water supply port in the vehicle body cover as in the conventional case, it is necessary to remove the vehicle body cover every time water is supplied, which is a troublesome work. Further, when disposing the lid on the vehicle body cover, it is necessary to separately provide a key for preventing tampering, which causes a problem that the cost is increased and the lid is not visible because it is visible from outside. Further, since the leg shield 7 forming the trunk recess 152 and the water supply hose 118 of the radiator 116 are also fixed to the vehicle body frame 2, the water supply port 11
8a and the insertion hole 152d of the trunk recess 152 can be improved in positional accuracy.

The front end of the footboard 8 is connected to the lower end of the leg shield 7, and the footboard 8 is connected to the front end of the footboard 8.
The under cover 9 is connected to the lower surface of the. The foot board 8 includes a tunnel portion 7b of the leg shield 7, left and right foot portions 7c, 7c, and a tunnel portion 8a linearly extending rearward, and foot portions 8b, 8b.
And the left and right side frames 12 are arranged in the tunnel portion 8a.
The straight portion 13b of the down tube 13 is disposed below the.

A box-shaped storage recess 161 formed by bulging the foot portion 8b downward is integrally formed in the front-rear center of the right foot portion 8b of the footboard 8. A lid member 162 is attached to the hook 1 at the upper opening of the storage recess 161.
It is arranged so that it can be opened and closed by engaging and disengaging with 63.
The lid member 162 is formed flush with the foot portion 8b. A battery 164 is provided at the center of the storage recess 161.
However, an electric component 165 such as a heats is arranged in the front part, and the injection port 122a of the recovery tank 122 is arranged in the rear part. A foot mat (not shown) is laid on the upper surface of the foot portion 8b, and the mat member covers the lid member 162.

As described above, the battery 164, the electrical component 165, and the recovery tank 122 are housed in the storage recess 161.
Since the injection ports 122a are arranged centrally, inspection and maintenance can be easily performed. Further, since the lid member 162 of the foot portion 8b is covered with the mat, it cannot be seen from the outside, so that the appearance can be improved and the mischief can be prevented. Furthermore, since the storage recess 161 is formed integrally with the foot portion 8b, the rigidity of that portion can be improved. Also, the storage recess 16
Since only the injection port 122a of the recovery tank 122 is arranged inside the housing 1, and the main body is located outside the housing recess 161, the housing recess 161 and the lid member 162 can be made smaller.
Conventionally, batteries, electrical components, etc. are individually dispersed and arranged in the vehicle body cover, and it is necessary to remove the covers each time inspection work is performed, which is a troublesome work.

Further, the tunnel portion 8 of the footboard 8
A product entry opening 166 is cut out at the center of a, and a stepped flange portion 166a is integrally formed at the peripheral edge of the opening. A separately formed storage box 167 is removably inserted in the opening, and a flange portion 167a integrally formed on the upper edge of the storage box 167 is connected to the footboard 8 and the side cover 10 by a bolt 167b. It is fastened and fixed. A lid 168 is openably and closably arranged in the article storage opening 166.
The front edge of 68 is hinged, a lock member 168a with a key is attached to the rear portion, and the lid 168 is flush with the tunnel portion 8a.

By removing the storage box 167, the engine unit 50, the electric fan 117 of the radiator 116, and the like can be maintained by inserting a hand through the storage opening 166. Further, since the container box 16 and the side cover 10 are fastened together, the number of parts can be reduced.

The front end of the side cover 10 is connected to the rear end of the footboard 8. The seat 4 is disposed on the upper portion of the side cover 10.
As will be described later, has a structure in which a front seat 4a and a rear seat 4b higher than the front seat 4a are provided, a cushion 4d is arranged on a bottom plate 4c, and the cushion 4d is covered with a skin 4e. The side cover 10 includes a pair of left and right lower side covers 170, a left and right integrated upper side cover 171, and a left and right integrated front side cover 172.
It has a three-part structure composed of and. The lower side cover 170 covers the left and right sides of the power unit 3 as well as the upper portion of the rear wheel 52, and between the lower side cover 170 and the front portion of the upper side cover 171, a rear passenger footrest 170a is provided. positioned. The upper side cover 171 extends obliquely upward so as to cover the lower part of the rear seat 4b of the seat 4, and on the rear end surface of the upper side cover 171, there is provided a sign light 171a in which a tail lamp, a stop lamp and a flasher lamp are integrated. It is arranged. The front side cover 172 covers the lower portion of the front seat 4a of the seat 4 and is fixed together with the footboard 8 by tightening.

The rear seat 4 in the side cover 10
A storage box 174 is arranged below b. The storage box 174 is of a size and shape capable of storing a helmet or the like, and is bridged between the rear frames 15 and fixed by bolts.
The opening edge 174 a of the sheet 74 is covered with the bottom plate 4 c of the seat 4. A portion of the bottom wall 4c facing the opening edge 174a is formed so as to bulge upward in a convex shape, thereby ensuring an escape space at the top of the helmet.

As shown in FIG. 30 (a), the upper side edge of the upper side cover 171 has a concave groove extending in the front-rear direction and inclined forward and downward toward the front of the vehicle body, into which the seat side edge 4d enters. 175 is integrally formed. This concave groove 1
Reference numeral 75 denotes an outer surface 17 that forms an outer surface of the side cover 171.
A seal portion (inner side wall) 175c that is bent downward from the upper end of 5a and surrounds the opening edge portion 174a of the storage box 174 is integrally formed. The weather strip 176 attached to the bottom plate 4c of the seat 4 is in contact with the upper surface of the seal portion 175c,
As a result, between the seat 4 and the upper side cover 171,
The space between the storage box 174 and the storage box 174 is sealed. The outer wall portion 175b of the recessed groove 175 covers the outside of the side edge portion 4d of the seat 4 from the longitudinal center portion to the rear portion of the seat 4, and the lower end of the side edge portion 4d is inside the recessed groove portion 175b. positioned. Further, the inner wall 175d of the concave groove 175 has an opening edge portion 17 of the storage box 174.
It covers the outside of 4a.

As shown in FIGS. 30 (b) and 33, a grab bar 173 made of aluminum die cast is arranged at the rear of the upper side cover 171. The grab bar 173 has a generally U-shape that surrounds the left and right side portions and the rear end surface of the rear seat 4b. The outer surface 173a has a wall 173c and is continuous with the outer surface 175a of the side cover 171. A cross member 173 is provided between the rear ends of the left and right outer walls 173b.
d is integrally formed. A bottom wall 173c formed integrally with the front portion of the outer wall 173b is bolted to the center portion of the support pipe 16 in the front-rear direction via a bracket 176. The left and right ends of the cross member 173d are attached to the rear end of the support pipe 16 by a bracket 178.
Bolted and fixed through the cross member 1
The locking device 1 for the seat 4 is provided at the center of the vehicle width direction 73d.
79 is fixed.

The overlapping portion of the upper side cover 171 with the grab bar 173 is recessed inward, so that the outer surface of the upper side cover 171 and the grab bar 173 are formed.
The outer surface is flush with the outer surface. Further, the outer wall 173b of the grab bar 173 has the seat 4
The side edge portion 4d of the above, and the lower end of the side edge portion 4d faces the bottom wall 173c.

As shown in FIGS. 31 and 32, a helmet holder 180 is integrally formed at the rear end of the outer wall 173b of the grab bar 173, and the holder 180 is formed by partially cutting out the outer wall 173b. It was formed by. This holder 180 has a clasp 1 for the helmet 181
By mounting the 81a, it is possible to prevent rainwater from entering while preventing theft, and at the same time, to install the side cover 10
Can be prevented from being scratched. That is, the mounted helmet 181 contacts the metal grab bar 173, does not easily contact the side cover 10, and the helmet opening faces downward, so that the side cover 10 is not damaged and the helmet 181 is not damaged. No rainwater will enter. Further, since the holder 180 is integrally formed with the grab bar 173, the cost is low. In addition, since the conventional structure is such that the holder is provided on the upper edge of the side cover, there is a problem in that the helmet easily hits the side cover directly and tends to face upward.

Further, as shown in FIG. 34, the rear carrier 1 on which the box 183 is mounted is provided above and behind the seat 4.
82 are provided. The rear carrier 182 is formed by bridging and connecting a plurality of reinforcing plates (not shown) between rectangular pipes 182a, and the first support members 184 fixed to the left and right rear ends of the pipe 182a. And is supported by a second support member 185 fixed to the central portion. The second support pipe 185 is bolted to the inner wall of the rear end of the grab bar 173 via a bracket 186, and the first support pipe 184 is the support pipe 16.
Is connected to a frame pipe 187 which is installed between the brackets 178 arranged at both ends of the.

The front end portion of the rear carrier 182 is extended so as to be located above the rear end upper surface 173f of the grab bar 173, and the rear seat backrest 188 is detachably attached to the extension portion 182b. . The backrest 188 has legs 189 at both ends in the vehicle width direction.
And the leg portion 189 is attached to the extension portion 182b. In the present embodiment, the rear carrier 182 is fixed to the support pipe 16 that constitutes the vehicle body frame 2 and the grab bar 173 fixed to the pipe 16, and the backrest 188 is attached to the carrier 182. The structure is simple compared to the case where the backrest is attached to the vehicle body frame via the stays or the seat is attached, and since an extra installation space can be eliminated, a large space inside the side cover can be secured. it can. Also, the backrest 18
8 can be easily attached and detached, and if removed, the extension 18
2b can be used as a luggage carrier space, and there is no trace when it is removed, which makes it possible to avoid deterioration of appearance.

Next, the seat device of this embodiment will be described. At the rear end of the front seat (main seat) 4a of the seat 4, a higher rear seat (tandem seat) 4b is formed, and the vertical wall portion 1 is provided at the boundary between the seats 4a and 4b.
90 is formed. A front backrest 191 is provided on the vertical wall portion 190. This backrest 19
Reference numeral 1 is intended to improve riding comfort by supporting the occupant's waist, and can be adjusted so as to be movable in the front-rear direction according to the occupant's height and the like.

A projecting portion 192 projecting forward of the vehicle body is integrally provided at the center of the vertical wall portion 190 in the vehicle width direction.
Further, on the back surface of the backrest 191, the convex portion 19 is provided.
A concave portion 191a surrounding the second front surface 192a, the left and right side surfaces 192b and 192b, and the upper surface 192c is provided. The forward protrusion amount of the convex portion 192 is determined by the movement adjustment mechanism 1 described later.
It is set to be slightly larger than the maximum forward movement amount of the backrest 191 by 93, whereby the back surface of the backrest 191 and the vertical wall portion 19 associated with the forward movement thereof.
It fills in the gap that occurs with 0.

The movement adjusting mechanism 193 has the following structure. A frame plate 194 is provided on the back surface of the backrest 191 so as to surround the recess 191a, and a mounting stay 195 is attached to the frame plate 194.
Is installed. The mounting stay 195 is formed by integrally forming a rod-shaped stay plate 195b extending rearward at the left and right ends of a plate body 195a extending in the vehicle width direction, and the plate body 195a is fixed to a frame plate 194 by bolting. The frame plate 194 is attached to the backrest 19
Since it is formed so as to surround the first recess 191a, the rigidity of the backrest 191 itself can be increased, and the sense of stability and the feeling of holding when supporting the waist can be improved.

On the other hand, a guide hole 196 into which the stay plate 195b can be inserted is formed at the left and right ends of the convex portion 192, and a rectangular tubular guide portion 197 is formed in the guide hole 196. ing. The guide portion 197 has a bottom portion formed by the left and right end portions 4c 'of the bottom plate 4c, and a guide member 198 in which the left, right and ceiling portions are formed in a U-shape. A plurality of reinforcing ribs 198a are integrally formed on the outer surface of the guide member 198. Also, the left and right end portions 4c of the bottom plate 4c
A bolt hole 199 is formed at a portion of the ′ facing the stay plate 195b at a predetermined interval in the moving direction of the stay plate 195b, and the stay plate 195b is fastened by a bolt 200 inserted in the bolt hole 199. There is. As a result, in the backrest 191, the front portion of the stay plate 195b is supported by the guide portion 197, and the rear portion is fixed by the bolt 200. Here, the front wall portion of the bottom plate 4c constituting the ceiling wall of the storage box 174 described above extends halfway along the front surface 192a of the convex portion 192, and the central portion in the vehicle width direction bulges upward from there. Only the left and right end portions 4c 'are formed horizontally, thereby avoiding interference with the top of the helmet.

According to the movement adjusting mechanism 193, the mounting stay 195 is fixed to the backrest 191 and the seat 4
The guide portion 197 is provided on the convex portion 192 of the
7, the stay plate 195a of the mounting stay 195 is inserted, and the rear end of the stay plate 195a is attached to the bolt 2
Since it is fixed with 00, the position of the backrest 191 can be adjusted by a simple work of only detaching and attaching the bolt 200, and since it is composed only of the mounting stay 195 and the guide portion 197, the structure can be simplified and The number of parts can be suppressed to the necessary minimum, and the cost can be reduced. Moreover, since the cushion thickness is not reduced, the riding comfort is not deteriorated.

A seat hinge 205 is provided below the front end of the seat 4, and the seat 4 swings up and down with the hinge 205 as a fulcrum. The seat hinges 205 are the left and right side frames 1 described above.
A hinge bracket 207 is fixed to a torii-shaped elevated bracket 206 that is erected between the Nos. 2 and 12, and a support bracket 208 is fixed to the lower part of the front end of the seat bottom plate 4c.
It is configured by connecting. A U-shaped lock member 210 is fastened to the lower rear end of the seat 4, and the lock member 210 is locked and unlocked by the lock device 179.

The support bracket 208 is shown in FIG.
As shown in, the right side of the vehicle body relative to the horizontal line B (left side in the figure)
Is inclined to be higher. The seat 4 is supported so that the hinge pins 209 are horizontal,
Since the support bracket 208 is located on the upper right side, it is arranged on the upper right side in the closed state. This is because one seat gas damper 225, which will be described later, is disposed slightly to the left of the vehicle body, so there is a risk that the seat gas damper 225 will move to the right when the seat is opened, and this is avoided. Since the seat 4 is locked by the lock device 179 when closed, the upper right portion is corrected to be substantially horizontal.

The central portion in the vehicle width direction of the front end portion of the front seat 4a of the seat 4 is formed so as to bulge upward.
“E” has a knee grip function of being held by the driver between the legs.

Further, below the front seat 4a of the seat 4, a fuel tank 21 mounted and fixed to the vehicle body frame 2 is provided.
1 is provided. A refueling port 211a is formed on the upper portion of the front end of the tank 211 so as to project therefrom.
A cap 212 is detachably attached to the. An oil supply opening 213 is formed on the front end surface of the bulging portion 4e of the seat 4. The fuel supply opening 213 is formed by inclining the front end portion 214 of the bottom plate 4c of the seat 4 upward. Since the front end portion 214 is erected upward, the thickness of the cushion 4d at this portion becomes thin, but since the body of the occupant does not come into contact with this portion, the riding comfort is not deteriorated. Further, the bulging portion 4e described above is formed by the upward standing.

A fuel lid 215 for opening and closing the refueling opening 213 is provided. The fuel lid 215 is composed of an inner panel 216 and an outer panel 217 made of sheet metal. A lower portion of the inner panel 216 is fixed to the support bracket 208 with a bolt 218, and an upper portion thereof is integrally formed with a front end portion 214 of the bottom plate 4c. It is fixed to the rib portion 214a with a bolt 219. The lower edge of the outer panel 217 is the inner panel 21.
A hinge pin 220 is connected to the lower edge of 6 to open and close. A lock member 221 that locks and unlocks the outer panel 217 is provided at the upper end of the inner panel 216.

The inner panel 216 has an opening 216a.
Is formed, and the opening edge of the opening 216a is bent inward and extends in a cylindrical shape. The fuel filler port 211a of the fuel tank 211 is inserted and arranged in the opening 216a. Further, the fuel filler port 211a and the inner panel 216
The boot 222 is disposed between the boot 222 and the opening 216a of the above, thereby preventing the fuel from flowing out, and the fuel overflowing into the boot 222 is collected by the tube 223. ing.

When mounting the seat 4 on the vehicle body frame 2, first, the lock member 21 of the seat 4 is mounted.
0 is locked to the locking device 179 fixed to the grab bar 173 to be positioned and fixed, and in this state, the front end of the seat 4 is fixed to the support bracket 208 of the seat hinge 205 with the bolt 224 while aligning the front end of the seat 4 with the support bracket 208. (See FIGS. 33 and 39). In this way, the oil supply opening 213 is formed on the front end surface of the seat 4 and the opening 213 is formed.
Since the hinge 205 is arranged in the lower part in the vicinity of, the seat 4 can be accurately and easily positioned in the front-rear direction and the left-right direction when the seat 4 is attached, and thus the seat 4 and the side cover 10 and the grab bar 173 can be aligned with high accuracy. At the same time, the accuracy with which the seal surface is aligned with the storage box 174 can be improved. As a result, the seat 4 and the side cover 10
It becomes possible to design a vehicle body with no gaps and gaps, and to improve the appearance. That is, conventionally, since the front end of the seat cannot be attached to the hinge while the lock member at the rear end of the seat is positioned, the alignment accuracy with the side cover is low, and there is a problem that a gap is likely to occur between the two. .

A gas damper 225 is arranged between the seat 4 and the body frame 2. The damper 225 is for reducing the labor when opening and closing the seat and for keeping the seat open. The gas damper 225 has a piston (not shown) slidably inserted into a cylinder 226,
One end of a piston rod 227 is fixed to the piston, and the other end of the rod 227 projects from the cylinder 226.

The damper 225 corresponds to the fuel tank 21.
It is arranged between the upper wall 211b of the first sheet and the seat bottom plate 4c and along the bottom plate 4c substantially horizontally in the front-rear direction. Further, a recess 211c extending in the front-rear direction is provided in a substantially central portion of the upper wall 211b of the fuel tank 211 in the vehicle width direction, and the damper 225 is accommodated in the recess 211c. The piston rod 227 of the damper 225 is a bracket 2 fixed to the front end of the rear frame 15.
28 is rotatably connected. The cylinder 226 is a bracket 229 fixed to the lower surface of the bottom plate 4c.
The seat side connecting portion of the cylinder 226 is closer to the seat hinge 205 in front of the vehicle body than the vehicle body connecting portion of the piston rod 227, and the hinge 2 is
It is located above 05.

Next, the stand device of the motorcycle 1 will be described. Straight portion 13b of the down tube 13
A side stand (not shown) having one leg is provided at the center of the main stand 2 and a main stand 2 at the rear end.
35 are provided. The main stand 235 has a hinge body 237 connected to a stand body 236 having left and right leg portions 236a and 236b.
The foot member 238 is connected to 36a. The hinge bracket 237 is a stand frame 23 that is connected by being bridged downward between the left and right straight portions 13b.
It is connected to the bracket 240 of No. 9 via the hinge pin 241. As a result, the stand body 236 can be vertically swung between the upright position A and the storage position B that abuts the lower surface of the crankcase 55 of the power unit 3.

The stand body 236 and the bracket 24
A spring (not shown) for constantly urging the stand main body 236 in the housing direction is provided between the spring and 0. A stopper member 242 for restricting the rotation of the stand body 236 at the standing position A is connected to the bracket 240, and the stopper member 2 of the hinge bracket 237 is connected.
A wide convex portion 243 is integrally formed in a portion that abuts on 42.

Both legs 236 of the stand body 236.
The crossbar 244 is connected to a and 236b,
The crossbar 244 is curved so as to project downward at the storage position B. And the crossbar 24
A rubber roller member 245 that comes into contact with the lower surface of the crankcase 55 is arranged at the center of the vehicle width direction of No. 4. The rubber roller member 245 is rotatably supported via a pin 247 between the left and right support plates 246a and 246b connected to the crossbar 244.

Then, the thick portion 2 extending in the front-rear direction is provided at the portion of the power unit 3 with which the roller member 245 contacts.
48 is formed, and the flank 24 is formed in the thick portion 248.
9 are formed. The flank surface 249 has a curved surface shape that suppresses a decrease in the road surface height of the stand body 236 due to the vertical swing of the power unit 3, and specifically, from the pivot shaft 20 of the power unit 3 to the rubber roller member. A curved surface is formed such that the front portion is located higher than the arc C having the radius up to the contact portion. That is, the power unit 3 extends from the rest position (see the solid line in FIGS. 43 to 45) to the end position (see the dashed line in FIGS. 43 to 45) and the most pressure sink position (see the chain double-dashed line in FIGS. 43 to 45). When it is rocked, the stand body 236 rocks in a direction in which the decrease in the road surface height due to the rocking is suppressed, that is, upward, so that the decrease in the bank angle θ ′ is avoided.

Referring to FIG. 47 conceptually showing the flank 249, a front portion of the flank 249 with respect to the roller member contact portion is located above the arc C, and a rear portion thereof is located below. Is located in.

Next, the function and effect of this embodiment will be described. In the vehicle body frame 2 of the present embodiment, the main frame 11 is connected to the upper portion of the head pipe 5, and the rear end of the main frame 11 is connected to the pair of left and right side frames 12 extending linearly rearward. Head pipe 5
A pair of left and right down tubes 13 are connected to the lower part of the vehicle body, and the bent portion 13c of the down tube 13 and the rear end portion 12a of the side frame 12 are connected by a suspension bracket 14. The rigidity of can be secured.

Further, since one main frame 11 is connected to the head pipe 5, an empty space can be secured around the head pipe as compared with the case where two main frames are connected, and as a result, a storage portion is provided inside the leg shield 7. It is possible to take a large volume when providing. Further, since the foot rests are formed by the straight portions of the left and right side frames 12 and the straight portions 13b of the left and right down tubes 13, the container box 167 having a large capacity can be arranged in the tunnel portion of the footboard 8.

Since the bent portions of the side frame 12 and the down tube 13 are connected by the vertical pipe 25, the frame rigidity can be further improved. Further, the suspension link 1 is attached to the upper portion of the side frame 12 connection portion of the suspension bracket 14.
7, the compression rod 22 is connected to the lower part, and the power unit 3 is supported by both connection parts, so that the support rigidity of the power unit 3 can be improved.

In the method of manufacturing the vertical pipe 25 of this embodiment,
Both ends of a flat plate 25 'having a circumferential expansion dimension a of the vertical pipe 25 are connected to the side frame 12 and the down tube 1.
3 was punched into a shape b'where the contact surface b between the vertical pipe 25 and the vertical pipe 25 was expanded, the flat plate 25 'was formed into a cylindrical shape, and the abutting portions 25a' were welded to each other. It is possible to improve the mating surface accuracy when the abutting surface a of the above is abutted and welded to the side frame 12 and the down tube 13, and the dimension at the time of attachment is larger than that in the case where the end surface of the conventional pipe is cut to form a curved surface. The accuracy can be improved.
Further, at the same time when the flat plate 25 'is punched, the jig holes 25b,
Since the water drainage hole 25c is formed, the conventional drilling process can be omitted and the manufacturing cost can be reduced.

In the steering apparatus of this embodiment, the upper portion of the steering shaft 30 is projected outward from the through hole 42 of the front cover 6, and the steering handle 35 is attached to this projection.
Since the handle holder 36 is attached, the handle 35 can be attached / detached without removing the front cover 6, and the assembling property and maintainability around the handle can be improved. Further, since the nut 41 is screwed onto the upper end of the steering shaft 30 and the handle holder 36 is tightened and fixed with the nut 41, the protrusions in the case of conventional welding or projecting the bolt mounting portion can be eliminated. , It is possible to prevent damage due to contact of cables.

A female taper surface 38 is formed on the handle holder 36.
To form the steering shaft 3 on the female tapered surface 38.
Since the male taper surface 39 of 0 is fitted and joined, the fastening strength when adopted in a large scooter can be improved, and the rigidity with respect to the vehicle body weight can be secured. The volume of the storage portion can be increased as compared with the conventional case where two front forks are extended and coupled together.

Since the through hole 42 of the front cover 6 is formed to have a larger diameter than the double nut 32, the nut 3
The attachment / detachment work of No. 2 can be easily performed from the through hole 42, whereby the front fork 33 and the steering shaft 30 can be attached and detached without removing the front cover 6, and the maintainability and workability can be further improved. Further, since the through hole 42 is covered by the lower surface of the handle cover 43, it cannot be seen from the outside and the deterioration of the appearance can be prevented.

In the engine unit 50 of the present embodiment, the cooling water pump drive gear 78 is connected to the drive gear 76 of the crankshaft 60 via the idler gear 77, and the idler gear 77 drives the oil pump drive shaft 75. Therefore, the oil pump drive gear can be omitted, the number of parts can be reduced, and the size can be reduced.

The idler gear 77 is used for the oil pump 79.
Since it is driven, the gear ratio of the oil pump 79 can be set regardless of the speed reduction ratio of the cooling water pump 80, and from this point also downsizing can be accommodated.

Furthermore, because of the above-described structure, the oil pump 79 can be arranged on the opposite side of the drive pulley 70 of the continuously variable transmission 51 and in the lower central portion of the crankcase 55, whereby the lubricating oil suction port is provided. Can be arranged at the center lower end of the oil pan 86. As a result, the oil passage can be simplified, and the suction loss of the pump that sucks air when the oil level changes can be prevented.

Further, in the cooling device for the continuously variable transmission 51 of this embodiment, the cleaner box 10 is composed of the recess 95a formed in the front portion of the transmission case cover 95 and the front cover 105.
7 is formed, and the suction port 109 for introducing the cooling air is formed at the rear end of the front side cover 105, the cleaner box 107 can be configured by using the existing parts, and a separate cap or The number of parts can be reduced, the structure can be simplified, and the cost can be reduced as compared with the case where the partition plate is provided. Moreover, in this case, since the recess 95a is formed in the transmission case cover 95, that much transmission case cover 9 is formed.
The rigidity of No. 5 is increased, and the generation of vibration and noise can be suppressed.

Further, since the front cover 105 and the transmission case cover 95 are fixed together so as to sandwich the element 108, the element 108 can be exchanged and cleaned only by removing the front cover 105.

Further, the suction port 10 of the front cover 105 described above.
Since 9 is opened on the side opposite to the traveling direction, it is more difficult for water and dust to enter due to the running wind than when a suction port is provided on the front side of the vehicle body.
Since the 09a and the rib 106a are arranged, the ingress of water and dust can be further suppressed, and the life of the element 108 can be extended.

According to the arrangement structure of the radiator 116 of this embodiment, since the radiator 116 is arranged in the front portion of the center tunnel 8a of the footboard 8, traveling wind can be secured and an empty space in the center tunnel 8a can be secured. It can be effectively used and can be arranged more freely than the conventional case where it is arranged in the front vehicle body cover, and the layout of the interior parts in the cover can be improved, and the volume of the housing can be increased. The engine unit 50
Since the water supply hose 118 and the return hose 121 can be shortened, the water leakage resistance can be reduced and the cooling efficiency can be improved. Further, since the center tunnel 8a has a function of exhausting air and a large ventilation passage can be taken, the cooling efficiency can be further improved.

Since the radiator 116 is arranged on the rear side between the inclined portions (vertical side portions) 13a of the left and right down tubes 13, it can be arranged without interfering with the turning locus of the front wheel 34 (see the chain line in FIG. 17). As a result, the wheel base can be shortened, and if the wheel base is left as it is, the space in the front-rear direction of the footrest can be enlarged. Further, since the front surface of the radiator 116 is protected by the left and right down tubes 13, it is possible to prevent damage due to an external force and to secure a height above the ground.

The left and right tank portions 11 of the radiator 116
Since 6b is wrapped around the inclined portion 13a of the down tube 13, the center portion 11a and the left and right down tubes 13 and 13 can be extended without increasing the vehicle width dimension.
The vertical dimension of 6a can be set large to increase the effective area and improve the cooling efficiency.

A carburetor 49 is arranged above the engine unit 50. Cooling water (warm water) from the engine is supplied to the carburetor 49, and the carburetor 49 is supplied.
Since the air bleeding screw 115 is arranged at the top of all cooling water passages including the radiator 116, it is possible to easily remove the air accumulated in the cooling water passages while preventing icing, and attach and detach the conventional hoses. The work can be improved as compared with the case where air is released.

According to the traveling air introduction structure of this embodiment, the traveling air introduction openings 125 are formed on the front left and right sides of the front cover 6.
Since the inner fender 126 and the upper extension 9d of the under cover 9 for guiding the traveling wind from the introduction opening 125 toward the radiator 116 are formed, the air resistance can be reduced and the rectifying effect can be obtained, and the appearance can be improved. The cooling air to the radiator 116 can be efficiently introduced while improving. Further, the extension 125a following the air guide opening 125 functions as a reinforcing member for the lower portion of the front cover 6, and the rigidity of that portion can be increased.

Introduction opening 1 in the inner fender 126
Since the horn 127 is disposed so as to face 25, a large horn volume can be emitted, water can be prevented from entering the upper portion of the front cover 6 and deterioration of the appearance can be avoided as compared with the case where a conventional horn slit is separately provided. .

Further, the radiator 116 of the under cover 9
An air outlet 9b is formed in the rear portion, and the air guide wall 9 stands obliquely forward from the rear edge of the outlet 9b toward the radiator 116.
Since c is formed, the negative pressure generated in the lower rear portion of the under cover 9 can be effectively used to improve the exhaust air efficiency, and thus the cooling air to the radiator 116 can be increased. Further, since the exhaust port 9b and the air guide wall 9c are not visible from the outside, it is possible to prevent the appearance from being deteriorated, and since the air guide wall 9c is provided, it is possible to avoid the influence of exhaust heat on the engine unit 50 and the like. Moreover, the adhesion of muddy water can be prevented.

According to the vehicle body structure of this embodiment, the maintenance opening 140 is formed between the upper edge 6c of the front cover 6 and the upper edge of the headlight opening 6d, and the maintenance opening 140 and the lower edge of the windshield 134 are formed. Since the cover 134a is covered with the maintenance cover 142, the bulb of the headlight 135 can be replaced and various meters can be connected through the maintenance opening 140 without removing the front cover 6, and the workability can be improved.

In this case, since the maintenance opening forming portion of the front cover 6 is inclined obliquely upward so that the upper portion is located rearward, the plane projected area of the maintenance opening, that is, the effective area when working from above is small. It becomes large, and workability can be improved also from this point.

Also, the lower edge 1 of the windshield 134
The mounting bolt 134b of 34a is the maintenance cover 1
42, and the maintenance cover 142
Since a pattern for enhancing the design effect can be applied to the, the appearance can be improved.

According to the main switch mounting structure of this embodiment, the insertion hole 7e is formed in the mounting seat 7d of the leg shield 7, and the engaging piece 7f is integrally formed on the peripheral edge of the insertion hole 7e. Flange 151
Since b is brought into contact with the peripheral edge of the insertion hole 7e and the projection piece 151c of the cylindrical body 151a is engaged with the engagement piece 7f, the switch cap 151 and the leg shield 7 are formed.
It is possible to eliminate a gap in the axial direction between the mounting seat 7d and the mounting seat 7d and improve the appearance.

Further, since the key cylinder 150a and the leg shield 7 are fixed to the common vehicle body bracket, the mounting error between them is reduced. From this point as well, the axial direction between the switch cap and the mounting seat 7d of the leg shield 7 is set. The gap becomes smaller.

Further, the insertion hole 7e is formed in the switch cap 15
Since the engaging piece 7e is formed to have a larger diameter than the cylindrical body 151a of No. 1, and the engaging piece 7e has elasticity, an error between the insertion hole 7e and the switch cap 151 in the direction perpendicular to the axis can be absorbed.

In the storage device of this embodiment, the right side portion of the vertical wall 7a of the leg shield 7 in the vehicle width direction is bulged to the front of the vehicle body to integrally form the trunk recessed portion 152, and the trunk opening 153 is notched in the left side portion. Since the separately formed trunk member 154 is attached to the trunk opening 153, the trunk capacity can be significantly increased and the storage function can be improved. The lower edge 154a of the trunk member 154 is located below the lower edge of the trunk opening 153, and the upper edge 1
Since 54b is located above the upper edge of the trunk opening 153, it is possible to prevent falling of stored items while increasing the trunk capacity.

Further, a lid 157 to which a lock member 159 is attached is provided in the trunk opening 153 and the opening of the trunk recess 152, and the lock claw 159c of the lock member 159 is engaged with the trunk recess 152 of the leg shield 7. Since the engaging portion 152f is integrally formed with the support recess 152g for supporting the rear end of the lock member 159, the lock member 159 is attached to the leg shield 7.
It is possible to improve the lock strength, improve the positional accuracy of the lock claw 159c and the engaging portion 152f, and securely lock even after long-term use.

In the above embodiment, the leg shield 7
Although the separate trunk member 154 is arranged only on the left side portion of the above, the present invention may be configured so that the entire storage portion is formed of a separate trunk member, in which case the trunk capacity can be further increased.

According to the side cover processing structure of this embodiment, the receiving portion 175 extending in the front-rear direction is provided in the upper edge portion of the upper side cover 171, and the outer wall portion 17 of the receiving portion 175 is recessed.
5a covers the side edge portion 4d of the sheet 4 and the inner wall portion 1
Since the opening 174a of the storage box 174 is covered with the seal portion 175c of 75b, no hands can be put under the seat 4, and mischief or theft can be prevented. Further, since the receiving portion 175 and the side edge portion 4d of the seat 4 have a labyrinth structure, a storage box 174 for storing rainwater or car wash water is provided.
It is possible to prevent water from entering the inside, and since the receiving portion 175 is inclined forward and downward toward the front of the vehicle body, even if rainwater or car wash water enters, it can be easily drained.

A grab bar 173 is provided at the rear of the upper side cover 171 and the outer wall 1 of the grab bar 173 is provided.
Since 73a covers the side edge portion 4d of the seat 4 and the outer surface of the grab bar 173 and the outer surface of the side cover 171 are flush with each other, it is possible to prevent mischief and water from entering and the outer surface of the vehicle body. Since it is a continuous surface, there is nothing that gets in the way when getting on and off, and it is possible to improve the getting on and off property and the appearance.

In the seat device of this embodiment, the convex portion 1 protruding forward is provided on the vertical wall portion 190 at the rear end of the front seat 4a of the seat 4.
92 is integrally formed, and a concave portion 191a having a size enclosing the convex portion 192 is provided on the back surface of the backrest 191. The protrusion amount of the convex portion 192 is larger than the forward movement amount of the backrest 191. When 191 is moved, the gap between the back surface and the vertical wall portion 190 is the convex portion 19
Since it is hidden by 2, it is possible to prevent the appearance from being deteriorated, and it is possible to suppress an increase in cost when the gap is hidden by a separate cover. Further, since the convex portion 192 is formed on the vertical wall portion 190 side of the seat 4, it is possible to avoid lateral spread of the backrest which would occur when a convex portion is provided on the backrest side, and to stabilize the passenger's riding posture. Moreover, since the space at the lower rear portion of the vertical wall portion 190 does not narrow, the influence on the storage box 174 can be avoided.

According to the refueling structure of this embodiment, the front end portion 214 of the bottom plate 4c of the seat 4 is erected upward on the front end surface of the seat 4 and the left and right side portions are inclined upward to form the refueling opening 213. Since the fuel lid 215 that opens and closes the opening 213 is arranged and the oil supply port 211a of the fuel tank 211 is arranged inside the oil supply opening 213, it is possible to perform the oil supply without opening and closing the heavy seat 4. . Further, since the fuel filler port 211a is arranged at the front end of the seat 4, even if the cushion thickness of the front end portion 214 is thin, it does not affect the riding comfort, and also has a knee grip function and effectively uses the space inside the seat. The required tank capacity can be secured without increasing the seat height. Further, a seat hinge 205 fixed to the vehicle body frame is arranged below the front end of the seat 4, so that the lid 215 and the fuel filler port 211a can be accurately aligned.

Further, a damper 225 is arranged between the seat 4 and the vehicle body frame 2, the piston rod 227 of the damper 225 is connected to the rear frame 15, and the cylinder 2
26 is connected to the bottom plate 4c of the seat 4, and the connecting portion is located in front of the connecting portion of the piston rod 227 in the vehicle body and closer to the seat hinge 205, so that the effort for opening and closing the seat is reduced. , Damper 22
The swing stroke of 5 can be reduced. Further, since the damper itself can be configured compactly, the arrangement space can be reduced, and the capacity of the fuel tank 211 can be secured.

The damper 225 is used for the seat hinge 20.
Since it is accommodated in the recess 211c that is recessed in the upper wall 211b of the fuel tank 211, the influence of the recess 211c on the fuel capacity is small, and the capacity of the storage box 174 and the loading and unloading of luggage are small. It has no effect. Further, since the damper 225 is arranged substantially in the center in the vehicle width direction, it is possible to prevent rattling when the seat is opened and closed with only one damper.

In the stand device of this embodiment, when the power unit swings upward by θ (to the right), the road surface height of the vehicle body decreases by ΔH, but the stand body 236 moves upward along the flank surface 249. Since it swings by ΔL, the decrease in road surface height at the right end portion of the stand body 236 is reduced.

As described above, in the present stand device, the rubber roller member 245 is rotatably mounted on the stand body 236, and the front side portion and the rear side portion form curved surfaces which are located above and below the arc centering on the pivot shaft 20. Flank 249
As a result, the decrease in the road surface height of the stand body 236 due to the swing of the power unit 3 can be suppressed, and thus the decrease in the bank angle θ ′ can be reduced and the vehicle attitude can be stabilized. Further, since the roller member 245 is arranged at the center in the vehicle width direction, both the leg portions 236 are compared with the case where the roller member 245 is arranged at one side portion.
The inclination of a and 236b can be prevented. Further, the roller member 2
Since 45 can be freely rotated, abrasion due to rubbing can be suppressed,
Life can be extended.

48 to 50 are views for explaining a pipe member manufacturing method according to an embodiment (second embodiment) of the invention of claim 2. In this embodiment, a pair of left and right steel pipe tank rails 301, 301 of a sports motorcycle are provided.
The cross pipes 302 are connected to each other by the cross pipe 302.
This is an example in which a fuel tank (not shown) is attached to 02.

The cross pipe 302 is the pipe 30.
Both ends of a flat plate 302 ′ having a circumferential expansion dimension a of 2 are punched into a shape b ′ in which the contact surface b with the tank rail 301 is expanded, the flat plate 302 ′ is formed into a cylindrical shape, and then the abutting portion is formed. It is manufactured by welding 302a 'to each other, and the basic manufacturing method is the same as that of the above embodiment.

The flat plate 302 'has a pair of left and right nut holes 303a, a positioning hole 303b, and a drainage hole 303.
c are respectively formed. Each of these holes 303a-30
3c is formed at the same time as the punching of the flat plate 302 'into the contact surface expanded shape. It should be noted that the holes may be formed by shifting them in time or in another step. Also, the flat plate 30
Projection nuts 304, 304 are welded to 2'to be coaxial with the nut holes 303a. The nuts 304 are welded after the punching work, and are arranged on one surface of the flat plate 302 ′ so as to be positioned inside when the cross pipe 302 is formed.

A plane portion 305 extending in the axial direction is formed at a portion of the cross pipe 302 facing both nuts 304, and a fuel tank is bolted and fixed to the plane portion 305. The flat surface portion 305 is formed at the same time when the flat plate 302 ′ is processed into a cylindrical body. Specifically, the flat plate 302 ′ is pressed with a pressing plate against a portion corresponding to the flat surface portion 305, and the remaining It is manufactured by involving parts.

According to this embodiment, both ends of the flat plate 302 'having the circumferential expansion dimension a of the cross pipe 302 are punched into a shape b'where the contact surface b with the tank rail 301 is expanded, and this is cut into a cylindrical body. Molded into the above cross pipe 302
Since the above is manufactured, the accuracy of the contact surface with the tank rail 301 can be improved, and the same effect as the above embodiment can be obtained.

In this embodiment, the nut hole 303a and the positioning hole 30 are simultaneously punched at both ends of the flat plate 302 '.
Since 3b and the drain hole 303c are formed, the working process can be simplified, and the nut hole 303a of the flat plate 302 'can be simplified.
Since the projection nut 304 is welded to and then formed into a cylindrical body, a nut mounting seat as a separate component can be eliminated and the cost can be reduced.

Further, the projection nut 304 is used.
Is welded to the inside of the cross pipe 302, the position of the mounting surface can be lowered and the tank capacity can be increased as compared with the case where the fuel tank is mounted by interposing a conventional support piece. Also, the nut 304 of the cross pipe 302
Since the flat surface portion 305 extending in the axial direction is formed in the portion facing to, the mounting area of the fuel tank can be secured and the mounting strength can be improved.

In each of the above embodiments, the case where the invention is applied to the body frame of a motorcycle has been described as an example.
The use of the pipe member of the present invention is not limited to this, of course, and can be applied to the case where connected members having curved surfaces or deformed surfaces are connected by a pipe.

[0141]

As described above, according to the method for manufacturing a pipe member of the first aspect of the present invention, both end portions of the flat plate having the circumferential expansion dimension of the pipe member are provided on the contact surface between the connected member and the pipe member. After cutting into the expanded shape, the flat plate is formed into a tubular shape, and the abutting portions are welded, so that the accuracy of the mating surface between the pipe member and the connected member can be improved, and the reliability of the connection strength can be improved. There is.

According to the second aspect of the present invention, nut holes are formed in the flat plate at the same time as punching out both ends of the flat plate or by shifting in time, and a nut is welded to the inner surface of the flat plate so as to be coaxial with the nut hole. Since the flat part is formed in the part facing the nut of the flat plate at the time of forming the body, there is an effect that the processing process can be simplified and the manufacturing cost can be reduced by not requiring a mounting seat as a separate part, and the mounting space can be expanded. The effect is that the mounting area can be secured.

[Brief description of the drawings]

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

FIG. 2 is a left side view showing a suspension portion of the power unit of the above embodiment.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a side view showing the vertical pipe of the above embodiment.

FIG. 5 is a process drawing showing the method of manufacturing the vertical pipe.

FIG. 6 is a development view of the vertical pipe.

FIG. 7 is a left side view of the steering device of the above embodiment.

FIG. 8 is a cross-sectional view showing a mounting structure of the steering shaft.

FIG. 9 is a plan view of the power unit of the above embodiment.

FIG. 10 is a left side view of the power unit.

FIG. 11 is a rear view of the power unit.

FIG. 12 is a right side view of the power unit.

FIG. 13 is a partial cross-sectional plan view of the power unit.

FIG. 14 is a left side view showing the radiator arrangement structure of the above embodiment.

FIG. 15 is a plan view of the arrangement structure.

FIG. 16 is a schematic configuration diagram of the radiator seen from the front.

FIG. 17 is a schematic configuration diagram of the radiator seen from a plane.

FIG. 18 is a front view of the vehicle body cover of the above embodiment.

FIG. 19 is a left side view showing the front frame of the embodiment.

FIG. 20 is a left side view showing the radiator cooling structure of the above embodiment.

FIG. 21 is a cross-sectional view of the front cover of the above embodiment.

FIG. 22 is a rear view of the leg shield of the above embodiment.

FIG. 23 is a cross-sectional view showing a main switch mounting portion of the leg shield.

FIG. 24 is a cross-sectional view showing a storage portion of the leg shield.

FIG. 25 is a cross-sectional view showing a storage portion of the leg shield.

FIG. 26 is a cross-sectional view showing a lock member of the leg shield.

FIG. 27 is a plan view of a footrest portion of the footboard.

FIG. 28 is a cross-sectional view of a footrest portion of the footboard.

FIG. 29 is a left side view of the side cover of the above embodiment.

FIG. 30 is a sectional view of an upper edge portion of the side cover.

FIG. 31 is a cross-sectional view of the grab bar.

FIG. 32 is a side view showing the rear portion of the grab bar.

FIG. 33 is a sectional side view showing a seat rear portion of the above-described embodiment.

FIG. 34 is a side view showing a rear carrier of the embodiment sheet.

FIG. 35 is a perspective view of the seat.

FIG. 36 is a side view showing a backrest of the seat.

FIG. 37 is a configuration diagram showing a backrest adjustment mechanism of the seat.

38 is a sectional side view of the adjusting mechanism. FIG.

FIG. 39 is a sectional side view showing the front portion of the seat.

FIG. 40 is an exploded perspective view of the fuel lid of the above embodiment.

FIG. 41 is a configuration diagram showing a damper of the seat.

42 is a plan view showing the stand device of the above embodiment. FIG.

FIG. 43 is a left side view of the stand device.

FIG. 44 is a configuration diagram showing a flank of the stand device.

FIG. 45 is a schematic view of the stand device.

FIG. 46 is a view showing the seat hinge of the above embodiment.

FIG. 47 is a conceptual diagram showing a moving state of the stand device in the above-mentioned embodiment.

FIG. 48 is a plan view for explaining the method of manufacturing the cross pipe according to the embodiment of the second aspect of the present invention.

FIG. 49 is a cross-sectional view of the cross pipe of the above embodiment.

FIG. 50 is a development view of the cross pipe.

FIG. 51 is a rear view showing the conventional pipe manufacturing method.

FIG. 52 is a plan view showing a conventional method.

FIG. 53 is a perspective view showing a pipe manufacturing method according to another conventional example.

FIG. 54 is a perspective view showing a pipe according to another conventional example.

[Explanation of symbols]

 12, 13, 301 Connected member 25, 26, 302 Pipe member 25 ', 302' Flat plate 25a ', 302a' Butt portion 303a Nut hole 304 Nut 305 Flat portion a, b Contact surface

Claims (2)

[Claims] 1. A method for manufacturing a pipe member used for connecting members to be connected each having a curved surface, wherein a connecting side end of a flat plate having a circumferential expansion dimension of the pipe member is connected to the member to be connected and the pipe member. A cutting step of cutting the abutting surface to be in contact with the expanded shape, a molding step of molding the cut flat plate into a tubular body, and a pipe welding step of welding a butt portion of the molded tubular body A method for manufacturing a pipe member characterized by the above. 2. The method according to claim 1, wherein a step of forming a nut hole in the flat plate is performed, and a nut is welded to the inner surface of the flat plate, which is an inner surface, so that the nut is welded so as to be coaxial with the nut hole. A method for manufacturing a pipe member, comprising: a step; and a flat surface forming step of forming a flat surface portion on a nut mounting portion of the flat plate at the time of forming the tubular body.