JPH1024883A - Frame structure for scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve rigidity to a bending stress acting on a low floor part by constituting a vehicle frame, which is extended toward the rear direction of a vehicle body, of a lower frame and an upper frame positioned in its upper part. SOLUTION: A main pipe 12 is lowered from a head pipe to the diagonally rear direction of a vehicle body and extended horizontally from the upper rear part of the front wheel to the rear direction of the vehicle body. A pair of down pipes 13L, 13R are risen from the head pipe to the diagonally rear direction of the vehicle body to the bottom the main pipe 12 and extended diagonally upward in the rear direction of the vehicle body. A cross member 14 is fixed across the vertical rising members of the down pipes 13L, 13R and the rear end of the main pipe 12 is connected to the intermediate part of the cross member 12. The main pipe 12 and the horizontally extended parts of the pair of down pipes 13L, 13R are so arranged as to form an isosceles triangle with the main pipe being the apex and connected to each other by gasset plates 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scooter type vehicle frame structure.

[0002]

2. Description of the Related Art In a scooter type vehicle comprising a main pipe and side frames provided on both sides thereof to support a floor portion, the main frame and the side frames are located on substantially the same plane in the floor portion. For this reason,
When the distance between the front wheel and the rear wheel is long, as in a scooter-type vehicle with a long wheelbase, the length of the low-floor floor in the body frame structure increases, and when force acts before and after the vehicle, this low-floor floor A bending stress is generated in the portion.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and in a scooter type vehicle having a long wheel base having a long floor portion, the rigidity against bending stress acting on a low floor portion is increased. It is an object of the present invention to provide a frame structure of a scooter type vehicle.

[0004]

A frame structure of a scooter type vehicle according to the present invention is a motorcycle having a low floor type floor portion located between a front wheel and a rear wheel, and is curved downwardly following a head pipe. A low-floor portion is formed by the shape described above, and the body frame extending toward the rear of the vehicle body is constituted by a lower frame and an upper frame located above the lower frame.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. In FIG. 1, a scooter type vehicle 1 according to the present invention has a so-called American type body structure including a handle 2 provided at a high position and a seat (seat) 3 provided at a low position. The wheelbase is set to be much longer than that of a conventional motorcycle. The seat 3 is a so-called V-shaped seat in which a rider's seat and a tandem seat are integrally formed and have a substantially V-shape. Above the front wheel 4, a leg shield 5 having a sharp angle as viewed from the side is provided. This leg shield 5 is connected to the leg shield 5 and arranged between the front wheel 4 and the rear wheel 6. A body cover is formed by the step floor 7 and a rear cover 8 connected to the step floor and having a front edge inclined along a rear edge of the V-shaped seat 3 and covering an upper portion of the rear wheel 6. A screen 9 is provided above the leg shield 5 and in front of the handle 2, and side mirrors 10L and 10R are disposed on both left and right sides thereof.

In FIG. 2, a body frame is constituted by a head pipe 11, a main pipe 12, and a pair of down pipes 13L, 13R. The main pipe 12 falls obliquely rearward from the head pipe 11 and is located above the front wheel 4. Extending horizontally from the rear to the rear of the vehicle, a pair of down pipes 13L,
13R is the main pipe 1 diagonally rearward from the head pipe 11
It falls below 2 and extends parallel to each other behind the vehicle body, rises almost vertically at the rear, and extends obliquely upward and behind the vehicle body. As shown in FIGS. 3 and 4, a cross member 14 is fixed between the vertically rising portions of the down pipes 13L and 13R.
The rear end of the main pipe 12 is connected to an intermediate part of the pipe.

A main pipe 12 and a pair of down pipes 13
The horizontal extending portions of L and 13R are arranged so that the lines connecting the pipes form an isosceles triangle with the main pipe 12 as the apex, as is particularly apparent from FIG.
They are connected to each other by 15. From the gusset plate 15, a pair of stays 16L, 16R having an L-shaped cross section are protrudingly provided on the left and right sides. On these stays 16L, 16R, longitudinal U-shaped pipes 17L, 17R are provided with mounting plates 18L, 18R. Screwed through. The longitudinal U-shaped pipes 17L and 17R extend substantially along the main pipe 12 from below the head pipe 11 to below the seat 3 as shown in FIG.

In FIGS. 2 and 3, a substantially V-shaped seat pipe 19 is welded to the rear inclined portions of the pair of down pipes 13L and 13R, and the front ends thereof are formed with the vertical rising portions of the down pipes 13L and 13R. Support pipes 20a, 20b fixed between
Supported by The V-shaped sheet 3 is placed on the sheet pipe 19, and the hook 3a (shown in FIG. 8) provided at the rear portion of the V-shaped sheet 3 is locked by the locking portions 21a and 21b on the sheet pipe 19. After that, it is fixed to the seat pipe 19 by being bolted to the fixing portion 19a of the seat pipe 19 at the fixing portion 3b.

The low-floor step floor 7 described above has a third floor.
As shown in FIG. 4 and FIG. 4, a floor panel 2 provided along the main pipe 12 and the pair of down pipes 13L and 13R is provided.
Consists of two. This floor panel 22 has a convex portion 22a at the center thereof where the main pipe 12 is located. As shown in FIG. 6, the front ends of the longitudinal U-shaped pipes 17L and 17R provided along the main pipe 12 are provided. And it is bolted to the mounting plates 23a, 23b fixed to the rear end.
Side panels 24L and 24R are provided at the side ends of the floor panel 22, and are bolted to the rear end of the longitudinal U-shaped pipe 17L (17R) at the rear end bent portion 24a as shown in FIG. Is done.

As shown in FIGS. 6 and 7, a fuel tank 25 is provided between the horizontally extending portions of the pair of down pipes 13L and 13R.
Are provided, and the mounting
At 26a and 26b, bolts are attached to mounting plates 27a and 27b fixed between the pair of down pipes 13L and 13R. A fuel injection port 28 projects from an upper surface of the fuel tank 25, for example, on the right side of the main pipe 12 with respect to the traveling direction of the vehicle, and a fuel cap 29 is mounted on an open end thereof.
To enable the supply of fuel to this fuel tank 25,
The upper part of the fuel cap 29 of the floor panel 22 is open, and a lid (lid) 30 is hinged to this opening at hinges 30a, 30b.
It is provided so that it can be opened and closed freely via the. A key 31 is attached to the center of the free end of the lid 30. Fuel tank 25
An under guard plate 32 for protecting the tank 25 is provided below the lower side of the tank 25. The under guard plate 32 is fitted to the lower edges of the side panels 24L and 24R at its side edges. .

2 and 8, a triangular gusset plate 33 is welded to the rear rising portions of the pair of down pipes 13L, 13R.
A power unit 35 formed integrally with the engine 34 and transmitting the power of the engine 34 to the rear wheels 6 is swingably attached at its front end via a link 36.
An air cleaner case 37 is mounted on the power unit 35. The rear end of the power unit 35 is connected to the left side of the axle of the rear wheel 6 in the vehicle running direction. The right end of the axle is connected to the rear end of a support plate 38 whose front end is attached to the crankcase of the engine 34, as shown in FIG. A muffler outside the support plate 38
86 are arranged. As is clear from FIG. 4, the rear rising portions of the pair of down pipes 13L and 13R are expanded, whereby the swing amount of the air cleaner case 37 can be sufficiently secured without hindering the swing operation. Thus, the inclination angles of the down pipes 13L and 13R with respect to the vertical plane can be sufficiently set. Further, the capacity of a rear trunk 67 described later can be increased. A cross member 39 is fixed between the rear ends of the pair of down pipes 13L, 13R. The cross member 39 has upper ends of a pair of suspensions 40L, 40R supporting the rear wheel 6 with stays 41a, 4R.
Attached via 1b. By providing the cross member 39, the support strength of the suspensions 40L, 40R by the down pipes 13L, 13R is increased.

In FIGS. 3 and 8, the rear cover 8
Has a protruding portion 42 at its upper portion, and a plurality of louvers (discharge ports) 43 for discharging heat emitted from the engine 34 to the outside are provided on a rear inclined surface of the protruding portion 42. According to this, the heat emitted from the engine 34 rises along the upper inclined surface 8a of the rear cowl 8 to the protruding portion 42 due to its nature, and by the action of the traveling wind flowing along the rear inclined surface of the protruding portion 42, The air is smoothly discharged to the outside while being sucked out from the louver 43. A backrest 44 is provided on the front surface of the protrusion 42. A partition plate 8a made of a heat insulating material is provided on an upper inclined surface of the rear cowl 8 which is inclined along the rear edge of the sheet 3. The partition plate 8a is preferably made of a resin having heat insulating properties. 8 and are integrally formed. By disposing a partition plate 8a having heat insulating properties on the upper inclined surface of the rear cowl 8, transmission of heat released from the engine 34 to the seat 3 can be prevented and the seat 3 can be protected from heat. The service life can be extended.

The rear cover 8 includes an upper cover (first portion) 8A that covers a peripheral portion of the engine 34 and an upper portion of the rear wheel 6;
A lower cover (second portion) 8B that covers the power unit 35 is vertically divided into two parts. According to this, when performing maintenance or the like of the power unit 35, it is not necessary to remove the entire rear cover 8 from the vehicle body, and only the lower cover 8B needs to be removed, so that workability such as maintenance can be improved. The lower cover 8B is formed with an inlet 45 that opens forward in the vehicle traveling direction and that introduces traveling wind into the vehicle body. As shown in FIG. 4, the lower cover 8B has a boss 53 inside its front end, and the boss 53 is used to provide a mounting hole 54 provided at the rear end of the above-mentioned longitudinal U-shaped pipe 17L (17R).
Is fitted to.

Below the seat 3, a battery case 46,
A chamber 47 to which air is supplied from an air cleaner case 37 on the power unit 35 via a tube (not shown), a carburetor 48 communicating with the chamber 47, and the like are arranged. These members are covered by a seat lower cover 49. As is clear from FIG. 3, the rear part of the convex part 22a of the floor panel 22 is cut diagonally, and the lower end of the seat lower cover 49 is joined to the diagonal cut part of the convex part 22a to form the floor panel 22. It is continuous, which enhances the unity of the body cover. Further, since the lower seat cover 49 is joined to the floor panel 22 at a position higher than the floor surface, sand and mud on the floor surface do not enter the vehicle body from the joint. Seat lower cover 49
A plurality of positioning pieces 50 and a plurality of fixing portions 51 are integrally provided at the lower end portion of the
As shown in FIG. 5, bolts are fixed to the fixing portion 52 projecting inward from the oblique cutting portion.

In FIGS. 4, 6 and 8, a main stand 55 is arranged below the seat 3 so as to be located between the under guard plate 32 and the power unit 35. As shown in FIG. 4, the main stand 55 has a pivot shaft rotatably attached to a cross member 56 fixed between the pair of down pipes 13L, 13R via stays 57a, 57b. 8, a leg 59L, 59R fixed to the rotating shaft 58, and a cross member 60 fixed between the legs, and a use position indicated by a dashed line in FIG. (Unused) position. Return springs 62L, 62R are stretched between the legs 59L, 59R and the stays 57a, 57b. A stopper 63 is attached near the rear rising portion of the down pipes 13L, 13R to abut on the main stand 55 in the storage position, and a rubber 64 as a cushioning material is attached to a contact surface of the stopper 63. I have. A main stand 55 disposed between the underguard plate 32 and the power unit 35 is a protective member for protecting auxiliary devices such as a fuel pump 65 disposed above the engine, the engine 34, and further a frame pipe. Also acts as.

The main stand 55 has a foot arm 61 projecting outward from the vehicle body from the leg 59L. When the main stand 55 is in the storage position, the footrest portion 61a of the footrest arm 61 is located in front of the introduction port 45 formed in the lower cover 8b of the rear cover 8 as shown in FIGS. The rear cover 8 is disposed so as to be located inside the vehicle body with respect to the outer edge of the overhang portion 8b. According to this arrangement, when the main stand 55 is not used, the footrest portion 61a of the footrest arm 61 is stored below the overhang portion 8b of the rear cover 8, so that it does not obstruct the rider. Further, when the main stand 55 is to be set up, the foot F may be carried on the footrest 61a under the overhang 8b of the rear cover 8 as shown in FIG. He never came.

In FIG. 2 and FIG.
Gusset plate 3 welded to rear riser of 13L, 13R
A trunk frame 66 as a rear storage room support frame extends rearward from the vehicle body from 3, and a rear trunk 67 forming the rear storage room is mounted on the trunk frame 66. As is apparent from FIG. 9, the trunk frame 66 has a substantially U-shape, is fixed to the gusset plate 33 at the front end thereof, and further via the support pipes 68L and 68R welded to the intermediate portion. Fixed to down pipes 13L, 13R. For example, three fixing portions 69 are welded to the frame 66 and the support pipes 68L, 68R, and the rear trunk 67 has three mounting holes 70 provided at the bottom thereof.
Bolted at

The rear trunk 67 is, as shown in FIG.
It consists of an upper case 67U and a lower case 67L, each case being integrated by being fitted to each other at an open end thereof to define a trunk room (storage room), and fixed portions 71U provided at several places on the periphery. , 71L, and are fixed to each other. A plurality of ribs 72U are provided on the outer surface of the upper case 67U in the horizontal direction, and a plurality of ribs 72L are provided integrally on the bottom surface of the lower case 67L in the vertical and horizontal directions, respectively. The rigidity of the trunk body is improved.

The rear trunk 67 mounted on the trunk frame 66 is surrounded by the upper cover 8A of the rear cover 8. As shown in FIG. 9, the upper cover 8A is bolted to a plurality of nuts 74 welded to the trunk frame 66 through a plurality of mounting holes 73 formed at the lower end thereof. Fixed against. A taillight assembly 76 is attached to a stay 75 welded to the rear end of the trunk frame 66. The taillight assembly 76 includes a taillight 77 and a license plate 78
And a number guard 79 to which is attached. The lower cover 8B of the rear cover 8 has, for example, two convex pieces 80 at the upper edge and a convex piece 81 at the upper rear end.
80, 81 are respectively fitted into the fitting holes 82 drilled in the upper cover 8A and the fitting holes 83 drilled in the number guard 79, and are drilled in the number guard 79 at the rear end mounting holes 84. Mounting hole
It is bolted to 85. The front end of the lower cover 8B
As described with reference to FIG. 4, the boss 53 is fitted to the vehicle body frame.

In FIG. 8, the rear trunk 67 is opened to the rear of the vehicle body in a state housed in the rear cover 8, and the opening edge is provided so as to slightly protrude from the body (rear cover 8). A lid (lid) 91 for opening and closing the opening is swingably attached to the trunk frame 66 via a hinge 92 at a lower end thereof, and a key 93 is provided at the center of the upper end. A seal member 94 that presses against the lid 91 in a closed state is attached to an opening edge protruding from the body of the rear trunk 67, thereby improving the waterproofness of the rear trunk 67. As is apparent from FIG. 13, a groove 96 is defined by the edge of the upper cover 8A, the rear trunk 67 and the seal member 94.
96 acts as a guide groove for draining rainwater.

The rear cover 8 is formed wider than the step floor 7, as is apparent from FIG. The rear trunk 67 accommodated in the rear cover 8 is disposed such that the outer wall thereof is close to the inner surface of the rear cover 8. According to this, the capacity of the trunk room of the rear trunk 67 can be improved, and the rear trunk 67 can be used as a reinforcing member against deformation of the rear cover 8, and the rigidity of the rear cover 8 can be improved without using a dedicated reinforcing member. Become.

A muffler 86 is located below the right side of the rear trunk 67 with respect to the vehicle running direction, as shown in FIG. As a measure against heat from this muffler 86, the muffler
A heat insulating material 87 is attached to the trunk bottom plate above the 86. This heat insulating material 87 is made of glass wool 88 and silver paper 89 covering the same as shown in FIGS. 12 (A) and 12 (B), and is fixed to the trunk bottom plate by caulking rivets 90 at several places. Is done. By the action of the heat insulating material 89, the heat from the muffler 86 can be blocked and the trunk bottom plate can be protected from the heat. Further, an air layer 95 is formed between the heat insulating material 89 and the trunk bottom plate due to the presence of the rib 72L, and the heat insulating effect can be further improved by the air layer 95.

In the above embodiment, the step floor 7, the rear cover 8, the floor panel 22, the rear trunk 67
Etc. are formed by resin, and the main pipe 12, the down pipes 13L, 13R, the seat pipe 19, the trunk frame 6
The frame member such as 6 is made of metal.

[0024]

As described above, in the frame structure of the scooter type vehicle according to the first aspect of the present invention, the upper frame and the lower frame having different heights on the low floor portion of the body frame structure are formed. With this configuration, it is possible to increase the rigidity of the low floor section with respect to bending stress. Also, in the frame structure of the scooter type vehicle according to the second aspect of the present invention, by forming a loop shape of the frame by the head pipe, the upper frame, and the lower frame, the external force received by the frame can be dispersed, and the rigidity of the entire frame can be reduced. It is possible to further improve. Further, in the scooter type vehicle frame structure according to the third aspect of the present invention, the gap between the upper frame and the lower frame in the low floor portion can be effectively used. Further, in the frame structure of the scooter type vehicle according to the invention of claim 4 of the present application, by providing the low floor type floor portion between the upper frame and the lower frame,
The low-floor floor can be lowered, and the driver can easily get on and off.

[Brief description of the drawings]

FIG. 1 is a side view of a scooter type vehicle according to the present invention.

FIG. 2 is a side view showing a frame structure of the scooter type vehicle shown in FIG.

FIG. 3 is an exploded perspective view of a seat portion.

FIG. 4 is a cutaway plan view of a rear portion of the vehicle body.

FIG. 5 is a front view showing a rear portion of the vehicle body cut at a center portion of the vehicle body.

FIG. 6 is a side view including a partially broken surface showing a step floor portion.

FIG. 7 is a sectional view taken along the line II of FIG. 6;

FIG. 8 is an enlarged side view including a partial cross section of a rear portion of the vehicle body.

FIG. 9 is an exploded perspective view of a rear portion of the vehicle body.

FIG. 10 is an exploded perspective view showing a rear trunk.

FIG. 11 is a perspective view showing the positional relationship between the rear trunk and the muffler, as viewed obliquely from below.

FIGS. 12A and 12B are cross-sectional views taken along lines II-II and III-III of FIG. 11;

FIG. 13 is an enlarged view of a main part of FIG. 8;

[Description of Signs of Main Parts]

 3 V-type seat 7 Step floor 8 Rear cover 11 Head pipe 12 Main pipe 13L, 13R Down pipe 17L, 17R Long U-shaped pipe 19 Seat pipe 22 Floor panel 25 Fuel tank 32 Under guard plate 34 Engine 35 Power unit 40L, 40R Suspension 49 Seat lower cover 55 Main stand 61 Foot arm 66 Trunk frame 67 Rear trunk

Claims (4)

[Claims] 1. A motorcycle having a low-floor type floor portion located between front and rear wheels, wherein the low-floor portion is formed by a downwardly curved shape connected to a head pipe, and toward a rear of the vehicle body. A frame structure for a scooter-type vehicle, wherein a body frame that extends is constituted by a lower frame and an upper frame located above the lower frame. 2. A front portion of the lower frame is connected to the head pipe, a rear portion of the lower frame rises upward, a front portion of the upper frame is connected to the head pipe, and a rear portion of the lower frame is connected to a rear portion of the lower frame. The scooter-type vehicle frame structure according to claim 1, wherein the frame structure is connected to a rising portion. 3. The scooter-type vehicle frame structure according to claim 2, wherein an article accommodating space is provided between said lower frame and said upper frame. 4. The scooter type vehicle frame structure according to claim 1, wherein said low floor type floor portion is provided between said upper frame and said lower frame.