CN1211247C - Car body frame of small-sized motorcycle type vehicle - Google Patents

Abstract

The body frame for scooter type vehicle of present invention comprises a molded front frame having a front head pipe part at the front end that can controls the direction and support the front wheel, and a rear frame molded into a shape of upwardly extending to the rear to combine with the rear end of the front frame, providing that the positional displacement of the head pipe part to the axial centerline of the rear frame can be relatively suppressed, even if there is error in assembling the rear frame to the front frame.

Description

Body frame for scooter type vehicles

The present invention relates to a body frame for a scooter type vehicle, and more particularly to a body frame for a motorcycle type vehicle having a front frame formed by molding and having a steerable direction at its front end and a rear frame The head pipe supporting the front wheel is ground, and the above-mentioned rear frame is molded into a shape extending rearward and upward, and is connected to the rear end of the front frame.

Conventionally, such a vehicle body frame is known from, for example, JP-A-10-218065.

However, in the above-mentioned existing vehicle body frame, the rear end of the front part frame and the front end of the rear part frame are connected by a substantially horizontal connecting surface. In the projection drawing of the plane projected parallel to the connection surface of the rear end of the frame and the front end of the rear frame, the above connection surface is arranged at a position far away from the lower end of the head pipe, and the rear frame to the front frame is produced. When there is an assembly error, the position of the head pipe relative to the center line in the width direction of the rear frame is relatively large.

The present invention has been made in view of such circumstances, and its object is to provide a head pipe that can be aligned with the centerline in the width direction of the rear frame even if an assembly error occurs in the assembly of the rear frame to the front frame. The positional deviation is suppressed to a relatively small body frame for a scooter type vehicle.

In order to achieve the above objects, the first invention of the present application provides a vehicle body frame for a scooter type vehicle. The scooter type vehicle includes a front frame and a rear frame. It has a head pipe that supports the front wheel in a steerable direction, and the rear frame is molded into a shape extending rearward and upward, and is connected to the rear end of the front frame, and is characterized in that it is connected to the front connecting plate. The rear connecting plate is arranged on the rear end of the above-mentioned front frame and slopes forward and downward. The rear connecting plate is arranged on the front end of the above-mentioned rear frame and slopes forward and downward, and overlaps On the above mentioned front truss panel.

According to such a structure, by overlapping and connecting the front connecting plate provided at the rear end of the front frame and inclined forward and downward, and the rear connecting plate provided on the rear frame and inclined forward and downward, the head tube and the above-mentioned connecting surface projected on a plane parallel to the connecting surface of the two connecting plate parts, the above-mentioned connecting surface is arranged at a position relatively close to the head pipe, and the rear frame is assembled to the front frame. When there is an error, the positional deviation of the head pipe relative to the centerline in the width direction of the rear frame can be suppressed to be relatively small.

In addition, the second invention is characterized in that the extension line of the axis of at least one of the plurality of bolts connecting the front connecting plate and the rear connecting plate is set to pass between the upper end of the steering handle and the front wheel of the vehicle. Between, above-mentioned steering direction handle can carry out steering direction operation, and is supported by above-mentioned head pipe. According to such a structure, on the projected view of the head pipe and the above-mentioned connecting surface projected on the plane parallel to the connecting surface of the front part connecting plate and the rear part connecting plate, the above-mentioned connecting surface is arranged at a position close to the head pipe. When there is an error in assembling the rear frame to the front frame, the positional deviation of the head pipe relative to the centerline in the width direction of the rear frame can be suppressed to be smaller.

The third invention is based on the structure of the second invention, and is characterized in that a fitting protrusion is protrudingly provided on one of the front connecting plate and the rear connecting plate, and the fitting protrusion is fitted. The fitting recess is provided on the other side of the above-mentioned front connecting plate and the above-mentioned rear connecting plate, and the extension line of the axis of the above-mentioned fitting protrusion and the above-mentioned fitting recess passes between the upper end of the steering direction handle and the axle of the front wheel. , the steering direction handle can be operated in the direction of operation, and is supported by the above-mentioned head pipe. According to such a configuration, on a projected view of the head pipe and the connecting surface projected on a plane parallel to the connecting surfaces of the front connecting plate and the rear connecting plate, the connecting surface is arranged at a position close to the head pipe, When an assembly error occurs when the rear frame is assembled to the front frame, the position deviation of the head pipe relative to the rear frame can be suppressed to be smaller, and the mutual connection between the front frame and the rear frame can be improved. The assembly accuracy when the frame is assembled.

The body frame for a scooter-type vehicle according to the fourth invention is based on the configuration of the first to third inventions, wherein the front frame integrally has a head pipe, and the head pipe extends downward and rearward from the head pipe. An extended lowering frame, and a floor support frame extending backward from the lower end of the lowering frame and arranged under the footrest floor, the rear connecting plate is superimposed on the front connecting plate from below, and the front connecting plate is arranged on The base plate supports the rear end of the frame. According to such a structure, since there is no need to secure a space for disposing the rear frame above the rear end of the floor support frame portion and to arrange the footrest floor above the rear end of the floor support frame portion, it is possible to set the footrest floor to a large size. Space.

The vehicle body member for a scooter-type vehicle according to claim 5 is based on the above-mentioned third invention, and is characterized in that a pair of left and right front connecting plates provided on the above-mentioned front frame and a pair of front connecting plates provided on the In the entire connection portion of the pair of left and right rear connecting plates on the rear frame, the fitting protrusions and the fitting recesses are arranged at three or more places. According to such a configuration, further Improve the assembly accuracy of the front frame and rear frame.

Fig. 1 is a side view of a scooter type vehicle.

Fig. 2 is an enlarged front side view of a scooter type vehicle.

Fig. 3 is an enlarged rear side view of a scooter-type vehicle.

Fig. 4 is a 4-direction view of Fig. 3 in a state where a storage box and a fuel tank are omitted.

Fig. 5 is a perspective view of a state in which the front frame and the rear frame are separated from each other.

Fig. 6 is an enlarged side view of the front frame.

Fig. 7 is a 7-direction view of Fig. 6 .

Fig. 8 is an enlarged sectional view taken along line 8-8 of Fig. 6 .

Fig. 9 is an enlarged sectional view taken along line 9-9 of Fig. 7 .

Fig. 10 is an enlarged sectional view taken along line 10-10 of Fig. 7 .

Fig. 11 is an enlarged side view of the rear frame.

Fig. 12 is a 12-direction view of Fig. 11 .

Fig. 13 is an enlarged sectional view taken along line 13-13 in Fig. 12 .

Fig. 14 is a partially cutaway side view showing a swing support unit attached to a vehicle frame.

Fig. 15 is a sectional view taken along line 15-15 of Fig. 14 .

Fig. 16 is a side view of the attachment portion of the rear shock absorber to the vehicle body frame.

Fig. 17 is a sectional view taken along line 17-17 in Fig. 16 .

Fig. 18 is a sectional view taken along line 18-18 in Fig. 17 .

Fig. 19 is a side view of the subframe.

FIG. 20 is an enlarged view taken along the arrow 20 of FIG. 19 .

Fig. 21 is a view from arrow 21 of Fig. 1 .

Fig. 22 is a sectional view taken along line 22-22 of Fig. 21 .

Fig. 23 is a sectional view taken along line 23-23 of Fig. 22 .

Fig. 24 is an explanatory diagram of a positional shift of the head pipe with respect to the center line of the rear frame. (a) is a side view of the main frame. (b) is the B-direction view of (a).

Fig. 25 is a view corresponding to Fig. 24 in a state where the connection surfaces of the front frame and the rear frame are substantially horizontal. (a) is a side view of the main frame. (b) is the B-direction view of (a).

Embodiments of the present invention will be described below based on an embodiment of the present invention shown in the accompanying drawings.

1 to 24 show an embodiment of the present invention. 1 is a side view of a scooter-type vehicle; FIG. 2 is an enlarged side view of the front of the scooter-type vehicle; FIG. 3 is an enlarged side view of the rear of the scooter-type vehicle; FIG. Figure 5 is a perspective view of the front frame and the rear frame separated from each other; Figure 6 is an enlarged side view of the front frame; Figure 7 is a 7-direction view of Figure 6; Figure 8 is a diagram Figure 9 is an enlarged sectional view of line 9-9 in Figure 7; Figure 10 is an enlarged sectional view of line 10-10 in Figure 7; Figure 11 is an enlarged side view of the rear frame; Figure 12 is Fig. 11 is a view from direction 12; Fig. 13 is an enlarged sectional view of line 13-13 in Fig. 12; Fig. 14 is a partial sectional side view showing the swing support portion of the engine mounted on the vehicle body frame; Fig. 15 is a sectional side view of 15-15 in Fig. 14 Line sectional view; Fig. 16 is a side view showing the installation part of the rear buffer component installed on the vehicle body frame; Fig. 17 is a sectional view of line 17-17 of Fig. 16; Fig. 18 is a sectional view of line 18-18 of Fig. 17; Fig. 19 It is a side view of the sub-frame; Figure 20 is a view from direction 20 of Figure 19; Figure 21 is a view from direction 21 of Figure 1; Figure 22 is a cross-sectional view along line 22-22 of Figure 21; Figure 23 is a view along line 23-23 of Figure 22 Sectional view; FIG. 24 is an explanatory diagram of the positional offset of the head pipe relative to the center line of the rear frame, (a) is a side view of the main frame; (b) is a B-direction view of (a).

First, as shown in FIG. 1, the body frame F of a scooter type vehicle is composed of a main frame 21 and a sub-frame 22 connected to the rear of the main frame 21. The main frame 21 is made of aluminum. The front end portion of the rear frame 24 formed by casting such as alloy is connected to the rear end portion of the front frame 23 which is cast formed by aluminum alloy etc. Frame 22. That is, the vehicle body frame F is formed by sequentially connecting the front frame 23 , the rear frame 24 , and the subframe 22 from the front side.

Referring to FIGS. 1 to 2 , a front fork 28 straddling the front wheel WF is supported on a head pipe 25 provided at the front end of the front frame 23 so as to be steerable. The lower end of the front fork 28 is arranged in front of the axle 31 of the front wheel WF. A front shock absorber 30 is provided between intermediate portions of the links 29 . In addition, a steering direction handle 32 is connected to the upper end of the front fork 28 .

3 and 4, the power unit P is composed of an engine E disposed on the front side of the rear wheel WR and a continuously variable transmission M disposed on the left side of the rear wheel WR. The front-back direction middle part of the front frame 24. The engine E is, for example, a water-cooled single-cylinder 4-stroke engine arranged substantially horizontally with its cylinder facing the front of the vehicle body. The continuously variable transmission is, for example, a belt type continuously variable transmission.

A rear wheel WR is pivotally supported at the rear of the power unit P, and a rear shock absorber 33 is provided between the rear of the power unit P and the rear of the main frame 23 , that is, the rear frame 24 . An air cleaner 34 disposed on the upper side of the rear wheels WR is attached to the rear of the power unit P, and the air cleaner 34 is connected to the engine E through a carburetor 35 . An exhaust pipe 36 leading exhaust from the engine E extends from the engine E to the right side of the rear wheel WR, and the exhaust pipe 36 is connected to an exhaust muffler 37 arranged on the right side of the rear wheel WR. A bracket 38 is rotatably supported by the engine E, and a radiator 44 is disposed on the right side of the power unit P. As shown in FIG.

Referring to FIGS. 5 to 7 , the front frame 23 integrally includes a head pipe 25 , a drop frame 26 , and a pair of left and right floor support frames 27 ₁ , 27 ₂ , and is formed by casting. The down frame 26 extends rearward and downward from the head pipe 25 , and the floor support frames 27 ₁ and 27 ₂ extend rearward from the lower end of the down frame 26 .

As shown in FIG. 8 , the down frame 26 is formed in a groove shape with an open front and a bottom, and a plurality of ribs 26a ... disposed in the groove are integrally provided on the down frame 26 .

The left and right pair of floor support frames 27 ₁ , 27 ₂ are each formed in a groove shape with the upper side open, and extend linearly. The front ends of the two floor support frames 27 ₁ and 27 ₂ are arranged on both sides of the lower end of the lower frame 26 respectively, and the front ends of the two floor support frame parts 27 ₁ and 27 ₂ bulge forward more than the front of the lower end of the lower frame 26. A pair of bent portions 50 ₁ , 50 ₂ are respectively connected and arranged on both sides of the lower end of the lowering frame portion 26 . Both bent portions 50 ₁ , 50 ₂ are also formed in a groove shape with an open top, and recessed portions 51 recessed toward the outer side are respectively provided on inner portions facing each other of the two bent portions 50 ₁ , 50 ₂ .

In FIG. 9, ribs 52, 52 extending in the front-rear direction are integrally provided on both floor support frames 27 ₁ , 27 _2, respectively. A pair of drain holes 53, 53 are respectively provided at the bottom of the two floor support frames 27 ₁ , 27 ₂ , and the pair of drain holes 53, 53 are arranged on both sides of the above-mentioned reinforcing rib 52, and are used to drain the ₁ , 27 ₂ water. Furthermore, drain holes 54 are also provided at the bottoms of the bent portions 50 ₁ , 50 ₂ .

The rear ends of the two floor support frames 27 ₁ and 27 ₂ are integrally connected to each other by a reinforcement frame 55 formed in a substantially U-shape with its upper side opened.

Front connecting plates 56 1 , 56 ₂ inclined forward and downward are integrally provided at the rear ends of the two floor supporting frames 27 ₁ , 27 ₂ , and a pair of bolts are respectively provided on the two front connecting plates _{56 1 ,} 56 ₂ Through holes 57,57. As shown in FIG. 10 , on one front connecting plate 56 ₁ , a single fitting recess 58 with an opening is provided on the lower surface of the intermediate portion between the two bolt through holes 57, 57, and the fitting recess 58 has a Bolt through holes 57...parallel axes; on the other front connecting plate ₅₆₂ , a pair of opening fitting recesses 58, 58 are provided below the middle part between the two bolt through holes 57, 57. The fitting recesses 58, 58 have axes parallel to the bolt penetration holes 57....

Referring to Fig. 11 and Fig. 12, the rear frame 24 integrally has a frame main portion 24a and a reinforced frame portion 24b, and the frame main portion 24a is formed in a substantially U-shape with an open front when viewed from above. The reinforcement frame part 24b connects between both sides of the middle part of the said frame main part 24a, and this rear part frame 24 is cast-molded so that it may incline to the rear and upper direction basically.

Rear connecting plates 61 ₁ , 61 ₂ inclined forward and downward are integrally provided at the front ends of both sides of the frame main part 24 a in the rear frame 24 , and are used to communicate with the front frame 23 from below. The front connecting plates 56 ₁ and 56 ₂ at the rear end overlap.

A pair of bolt through holes 62, 62 are respectively provided on the two rear connecting plates 61 ₁ , 61 ₂ , and the bolt through holes 62, 62 are connected with the front connecting plates 56 ₁ , 56 ₂ of the front frame 23 respectively. The bolt through holes 57, 57 correspond to each other. As shown in FIG. 13 , a single fitting protrusion 63 is protruded from one rear connecting plate 61 ₁ . The fitting protrusion 63 has an axis parallel to the axis of the bolt through hole 62 . . . The upper surface of the middle portion between 62 and 62 protrudes upwards for fitting with the fitting recess 58 provided on the front connecting plate ₅₆₁ , and a pair of fitting protrusions are protruded on the other rear connecting plate ₆₁₂ 63, 63, the pair of fitting protrusions 63, 63 have an axis parallel to the axis of the bolt through hole 62..., and protrude upward from the upper surface between the two bolt through holes 62, 62, and are used to communicate with the The fitting recesses 58, 58 on the connecting plate ₅₆₂ are fitted.

The front connecting plates 56 ₁ , 56 ₂ and the rear connecting plates 61 ₁ , 61 ₂ superimposed on the front connecting plates 56 ₁ , 56 ₂ from below pass through the bolts 64 , 64... are screwed together with nuts 65, 65... and are connected to each other. Moreover, in the connected state of the front and rear connecting plates 56 ₁ , 56 ₂ , 61 ₁ , 61 ₂ , each fitting protrusion 63 ... is fitted into each fitting recess 58 ... respectively, and the base support frame 27 ₁ , 27 ₂ rear ends and the front end of the rear frame 24 in three or more multiple locations, in this embodiment, three locations, each fitting protrusion 63 ... is fitted in each fitting In the concave portion 58 . . .

As shown in FIG. 1 , a plurality of (in this embodiment, a pair of) bolts respectively connecting the front connecting plate 56 ₁ and the rear connecting plate 61 ₁ , and the front connecting plate 56 ₂ and the rear connecting plate 61 ₂ The extension line L of the axis of at least one of 64, 64, in this embodiment, the extension line L, L of the axis of a pair of bolts 64, 64 passes through the steering direction handle 32 supported by the head pipe 25 that can be steered. Between the upper end of and the axle shaft 31 of the front wheel WF. The fitting protrusions 63... and the fitting recesses 58... are arranged between a pair of bolts 64, 64. Since they have axes parallel to the bolts 64..., the fitting protrusions 63... and the fitting recesses 58... The axis extension line also passes between the upper end of the steering handle 32 and the axle shaft 31 of the front wheel WF.

However, the engine E of the power unit P is supported by the rear frame 24 of the vehicle body frame F through the anti-vibration link 66, and the structure of the anti-vibration link 66 will be described with reference to FIGS. 14 and 15 .

The anti-vibration connecting rod 66 is provided with: a pair of left and right engine side brackets 67 ₁ , 67 ₂ ; a pair of left and right connecting rods 68 ₁ , 68 ₂ ; a beam 69 ; and a pair of stopper rubber parts 70 , 71 . The above-mentioned engine side brackets 67 ₁ , 67 ₂ are provided on the engine E; the above-mentioned connecting rods 68 ₁ , 68 ₂ have one ends swingably connected to the respective engine side brackets 67 ₁ , 67 ₂ and the other ends swingably connected to the engine side brackets 67 1 , 67 2 On the frame main part 24a of the rear frame 24, the connecting rods 68 ₁ and 68 ₂ are arranged in front of the carburetor 35; the above-mentioned beam 69 is connected between the two connecting rods 68 ₁ and 68 ₂ ; The rubber stoppers 70 and 71 are provided on the one link 68 ₁ so as to be in contact with the reinforcing frame portion 24 b of the rear frame 24 .

Engine side brackets 67 ₁ , 67 ₂ are provided on the engine E so as to protrude upward, mounting holes 72 , 72 are provided coaxially on these engine side brackets 67 ₁ , 67 ₂ , and each mounting hole 72 , 72 Rubber bushes 73, 73 are pressed in, and a cylindrical spacer sleeve 74 is sandwiched between the two rubber bushes 73, 73. A bolt 75 having a head 75 a coupled to the outer surface of one link 68 ₁ is passed through both rubber bushes 73 , 73 and the spacer sleeve 74 . A nut 84 coupled to the outer surface of the other link ₆₈₂ is screwed to the protruding portion of the bolt 75 protruding from the other link ₆₈₂ . That is, bolts 75 connected to one ends of both link rods 68 ₁ and 68 ₂ and arranged horizontally are supported by engine side brackets 67 ₁ and 67 ₂ via rubber bushes 73 and 73 .

Support holes 76 , 76 are coaxially provided on both sides of the middle portion of the frame main portion 24 a of the rear frame 24 , and rubber bushes 77 , 77 are press-fitted into the support holes 76 , 76 . Bolts 78 , 78 provided at the other ends of the two links 68 ₁ , 68 ₂ and parallel to the bolt 75 are swingably supported on the frame main portion 24 a via the rubber bushes 77 , 77 .

In one connecting rod ₆₈₁ , a box-shaped rubber supporting part 79 is provided in front of the straight line connecting the axis of the bolt 75 and the bolt 78, and the rubber supporting part 70 installed in the rubber supporting part 79 abuts against it. The abutment surface 81 is formed on the lower surface of the reinforcement frame portion 24 in the rear frame 24 . In addition, in the above-mentioned link ₆₈₁ , a box-shaped rubber support portion 80 is provided on the rear side of the straight line connecting the axis of the bolt 75 and the bolt 78, and the stopper rubber member 71 mounted on the rubber support portion 80 is abutted against. An abutting surface 82 is formed on the lower surface of the reinforcing frame portion 24b.

The crossbeam 69 connecting the two connecting rods 68 ₁ and 68 ₂ is formed in a substantially U-shape with the bottom open, and straddles the air intake connecting the above-mentioned carburetor 35 and the engine E disposed on the rear side of the two connecting rods 68 ₁ . device 83 is configured.

In such an anti-vibration link 66, the load acting on the bolt 75 from the engine E of the power unit P is absorbed by the elastic deformation of the rubber members 73, 73, and the rubber bushes 70, 71 press the contact surface 81, 82 is elastically deformed and absorbed, and then absorbed by the elastic deformation of the rubber bushes 77,77.

At the rear of the main frame 21 of the vehicle body member F, the upper end portion of the rear buffer member 33 is mounted, and the lower end portion of the buffer member 33 is connected to the power unit P. An installation structure in which the upper end is installed on the main frame 21 .

At the upper end of the rear cushion member 33 is provided a cushion side bracket 86 formed in a substantially U-shape open upward. On the other hand, in the rear part of the frame main part 24a which is the rear part of the main frame 21, that is, the main part of the rear frame 24, the above-mentioned buffer member is provided on a part corresponding to the rear buffer member 33. The opening 87 through which the side bracket 86 is inserted.

In addition, a shock absorber mounting portion 88 is integrally provided on the frame main portion 24a, and the mount portion 88 protrudes above the frame main portion 24a across the opening 87, and the shock absorber side bracket 86 sandwiches the shock absorber. The mounting part 88 is arranged.

A rubber bush 90 is press-fitted into a mounting hole 89 provided in the shock absorber mounting portion 88 , and a bolt 91 passing through the rubber bush 90 is screwed to the shock absorber side bracket 86 . That is, the shock absorber side bracket 86 is attached to the shock absorber attachment portion 88 via the rubber bush 90 .

In Fig. 19 and Fig. 20, the sub-frame 22 is formed by processing a metal pipe, and it has: a substantially U-shaped frame portion 92 that is opened in front when viewed from above; extends up and down and welds the middle portion to the frame portion A pair of raised parts 93, 93 at the front end of 92; The sub-frame 22 is bilaterally symmetrical about a center line extending in the front-rear direction of the vehicle body member 21 .

Bolt insertion holes 97 . Bolt insertion holes 98... are provided in the middle part of each. On the other hand, a pair of hub portions 99, 99 and a pair of hub portions 100, 100 are integrally provided on the frame main portion 24a of the rear frame 24 to protrude upward from the frame main portion 24a. The portions 99, 99 correspond to the two bolt insertion holes 97..., and the pair of hub parts 100, 100 correspond to the two bolt insertion holes 98.... The subframe 22 is mounted on the above-mentioned respective hubs 99, 99, 100, 100 by bolts 101... and nuts 102.... The hub parts 99, 100 arranged on the left side of the main frame part 24a are arranged at positions corresponding to the connection setting parts of the buffer mounting part 88 connected to the main part 24a of the frame, and the subframe 22 is connected to the buffer part. The position corresponding to the connection setting part of the frame main part 24a of the part mounting part 88 is connected to the frame main part 24a.

On the rear frame 24 and the sub frame 22, a storage box 39 capable of housing a helmet is disposed above the engine E and the carburetor 35 and supported.

As shown in FIG. 15 , a pair of leg portions 105 and 106 protruding downward are protrudingly provided at the lower end near the front of the storage box 39 . On the other hand, on the upper surface of the reinforcement frame portion 24b of the rear frame 24, support recessed portions 107, 108 for receiving the respective leg portions 105, 106 are provided. The leg portions 105 , 106 received by the support recesses 107 , 108 are connected to the reinforcing member portion 24 b of the rear frame 24 with bolts 109 , 109 and nuts 110 , 110 . In order to avoid interference with the air intake pipe 83 and the carburetor 35 disposed below the reinforcement member portion 24b and the bottom 39 of the storage box 39, the reinforcement member portion 24b and the bottom of the storage box 39 are oriented toward the running direction of the scooter-type vehicle. The state in front is formed obliquely downward to the right.

In addition, flat mounting plate portions 111 are respectively provided on the upper ends of the two standing portions 93 . The rear end of the storage box 39 is placed on these mounting plate parts 111 ..., and the rear end of the storage box 39 is mounted on the subframe by tightening and installing bolts 113 ... (refer to FIG. 1 ) screwed into the nuts 112 ... 22 on.

Thus, the storage box 39 is supported by the rear frame 24 and the subframe 22 above the engine E and the carburetor 35 , and the beam 69 of the anti-vibration link 66 is arranged between the storage box 39 and the engine E.

On the rear side of the storage box 39 , a fuel tank 40 is supported by the subframe 22 . In order to support the fuel tank 40 , a mounting plate 114 is welded to the rear end surface of the frame portion 92 of the subframe 22 , and mounting plates 115 , 115 are welded to both sides of the middle portion of the frame portion 92 . A pair of nuts 116, 116 are welded to the mounting plate 114, and nuts 117 are respectively welded to the mounting plates 115, 115. The rear portion of the fuel tank 40 disposed in the frame portion 92 is supported on the above-mentioned mounting plate 114 by bolts 118 ... (refer to FIGS. 1 and 2 ) screwed with two nuts 116, 116 respectively. In addition, both sides of the fuel tank 40 The parts are supported on the above-mentioned mounting plates 115, 115 by bolts 119... (refer to FIG. 1, FIG. 2) screwed with the above-mentioned nuts 117....

The body member F is covered with a body cover 41 made of synthetic resin. The body cover 41 has a leg cover 41a, a pedal floor 41b, a lower cover 41c, and a side cover 41d; the leg cover 41a covers the driver's legs. In the front, the footrest floor 41b is used to place the driver's feet, the lower cover 41c covers the bottom of the footrest floor 41b, and the side covers 41d cover the rear of the vehicle body from both sides.

Most of the storage box 39 supported on the rear frame 24 and the subframe 22, and the fuel tank 40 supported on the subframe 22 are covered with the above-mentioned side cover 41d, which can cover the vehicle body of the storage box 39 from above. The seat 42 is attached to the upper portion of the side cover 41d so as to be openable and closable. Moreover, the cap 40a for fuel injection provided in the fuel tank 40 is arrange|positioned so that it may protrude upward from the upper part of the upper side cover 41d.

In particular, as shown in FIG. 2 , a mounting plate 45 is integrally provided on the rear surface of the head pipe 25 . The mounting plate 45 faces the rear surface of the head pipe 25 at intervals, and a nut is fitted on the mounting plate 45 from above to support the mounting plate 45 . The member 46, the nut support member 46 is formed in a substantially U-shape with an open bottom. Furthermore, a nut 47 disposed between the back surface of the head pipe 25 and the mounting plate 45 is welded to the nut supporting member 46 . On the other hand, the hook 48 for attaching a shopping bag etc. is in contact with the portion of the foot cover 41a of the vehicle body cover 41 facing the above-mentioned mounting plate portion 45, and passes through the hook 48, the leg cover 41a, and the nut support member. 46 and the mounting plate 45 and the bolt member 49 combined with the hook 48 is screwed with the above-mentioned nut 47.

In FIGS. 21 to 23 , a pair of floor support plates 121 and 122 are erected between the two floor support frames 27 ₁ and 27 ₂ of the front frame 23 at intervals in the front-rear direction.

Bolt insertion holes 123, 123 are provided on the parts near the front of the two floor support frames ₂₇₁ , ₂₇₂ , and nut support members 125, 125 of approximately U-shape are fitted to each floor support frame ₂₇₁ from the side. , 27 ₂ , nuts 124, 124 corresponding to the above-mentioned bolt insertion holes 123, 123 are welded on the nut supporting members 125, 125. On the nut support members 125 , 125 are placed the lower cover support members 126 , 126 , both ends in the longitudinal direction of the floor support plate 121 , and both sides near the front of the pedal floor 41 b. The pedal floor 41b, the floor support plate 121, and the lower cover support members 126, 126 are jointly fastened to the floor support frames 27 ₁ , 27 ₂ by screwing the bolts 127, 127 into the nuts 125, 125 described above. Recesses 128 , 128 for accommodating the heads of the respective bolts 127 , 127 are provided on the pedal bottom plate 41 b so that the heads of the bolts 127 , 127 do not protrude upward.

A raised portion 121a raised upward is provided at the longitudinal center of the floor support plate 121, and the center of the front end of the footrest floor 41b is supported by the lower end of the foot guard 41a and the raised portion 121a.

Both ends in the longitudinal direction of the floor support plate 122 that supports the footrest floor 41b from below together with the floor support plate 121 have the same structure as the above-mentioned floor support plate 121, and are fastened together with the footrest floor 41b by bolts 129, 129. On the floor support frame 27 ₁ , 27 ₂ . Recesses 130 , 130 for receiving heads of the bolts 129 , 129 are provided on the pedal bottom plate 41 b. Bolt insertion holes 140 , 140 through which the bolts 129 , 129 are passed are provided in portions near the rear of the floor support frames 27 ₁ , 27 ₂ .

The under cover 41c is disposed so as to cover both floor support frame portions 27 ₁ and 27 ₂ of the front frame 23 from below. The lower cover supporting members 126, 126 are connected by bolts 131... and nuts 132....

Between the above-mentioned two floor supporting frames 27 ₁ , 27 ₂ is arranged a box-shaped article storage portion 133 whose upper part is open. The two sides of the upper end of the object receiving part 133 are integrally provided with supporting flanges 133a, 133b protruding to both sides, and the recesses 134, 135 that are located at the outer ends of these supporting flanges 133a, 133b are formed by the two bottom plates. The inner upper edges of the supporting frames 27 ₁ and 27 ₂ are supported.

In addition, a support flange portion 133c is integrally provided on the front portion of the upper end of the object receiving portion 133 and is carried on the lower surface of the lowering frame 26. Bolts 135 in bolt insertion holes 134 in the lower portion of the down frame 26 and nuts 136 screwed on the bolts 135 are fastened to the lower portion of the down frame 26 .

A support protrusion 133d is integrally provided at the rear end lower portion of the article storage portion 133, and is supported on the central portion in the width direction of the reinforcement member portion 55. The support flange portion 133d is inserted through the support flange portion 133d and inserted into the set Bolts 138 provided in bolt insertion holes 137 at the center portion in the width direction of the reinforcement frame 55 and nuts 139 screwed onto the bolts 138 are fastened to the center portion in the width direction of the reinforcement frame 55 .

A battery 143 is housed in the front part of the article storage part 133 . The battery 143 is fixedly arranged in the article storage section 143 by connecting both ends of a belt 146 hung on the battery 143 to the hooks 144 and 145 connected to the article storage section 133 at the front and back of the battery 143 .

Behind the above-mentioned battery 143, a radiator water storage tank 147 is fixedly disposed in the article storage portion 133. As shown in FIG.

At a position corresponding to the article storage portion 133, an opening 148 is provided in the central portion of the footrest base plate 41b, and the opening portion 148 is closed openably and closably by a cover 149 connected to the footrest base plate 41b by a bolt member 150. In the closed state, the upper surface of the cover 149 and the upper surface of the footrest bottom plate 41b are on the same surface.

Below, the effect of this embodiment is described,

The body frame F of this scooter-type vehicle is formed by connecting a front frame 23, a rear frame 24, and a sub frame 22 to each other. At least one of the respective vehicle frames 23, 24, 22, in this embodiment, the front frame 23 and the rear frame 24 are formed by casting. Therefore, any one of the cast front part frame 23 and the rear part frame 24 is used in common for multiple types of motorcycles whose models are different by changing a part of the vehicle body frame, so that the model change can be realized. The design and manufacturing costs of the car body frame are reduced. Moreover, by making each frame 23, 24, 23 modular, the parts of each member 23, 24, 22 can be assembled first, and the scooter type can be realized by assembling the three models after the assembly is completed. The assembly of the two-wheeled motor vehicle, therefore, can contribute to improving the efficiency of the assembly work of the scooter-type vehicle.

In addition, since the front frame 23 integrally has the head pipe 25, the down frame 26, and the floor support frames 27 ₁ , 27 ₂ and is formed by casting, the cast rear frame 24 is connected to the above-mentioned floor support frames 27 1 , 27 ₂ . The rear end of ₂₇₂ is connected to the rear end of the rear frame 24 by the sub-frame 22 formed by processing metal pipes. Therefore, for the sub-frame 22 that does not cost much in design and manufacturing costs, it can be made of metal. Tube processing can easily cope with model changes.

When the left and right pair of floor support members 27 ₁ , 27 ₂ of the front frame 23 are connected to the rear frame ₂₄ , _the front connecting plates 56 ₁ , 56 ₂ is connected to the rear connecting plates 61 ₁ , 61 2 which are arranged at the front end of the rear frame 24 and overlap the front connecting plates 56 ₁ , 56 ₂ , and the front connecting plates 56 ₁ , _{56 2 and} the rear connecting plates 61 ₁ , 61 ₂ as shown in Fig. 24(a) are all inclined rearward and downward, therefore, as shown in Fig. 24(b), the head pipe 25 and the above-mentioned connection face are connected with the two connecting plates 56 ₁ , 56 ₂ and 61 ₁ On the projected view of the plane parallel to the connection surfaces of 61 ₂ , the connection surfaces of the connection plates 56 ₁ , 56 ₂ , 61 ₁ , 61 ₂ are arranged relatively close to the head pipe 25 . Therefore, as shown in FIG. 24(b), even if an assembly error occurs between the rear connecting plates 61 ₁ and 61 ₂ on the rear frame 24 side and the front connecting plates 56 ₁ and 56 ₂ on the front frame 23, the head The position of the pipe 25 is offset obliquely with respect to the center line C in the width direction of the rear frame 24, and the displacement amount δ of the position of the head pipe 25 with respect to the center line C in the width direction of the rear frame 24 may be equal to ₁ , δ ₂ are kept relatively small, so that the alignment accuracy of the front wheels WF and the rear wheels WR with respect to the vehicle body can be improved.

In addition, the extension line of the axis line of at least one of each pair of bolts 64 and 64 connecting the front connecting plate 56 ₁ and the rear connecting plate 61 ₁ , and the front connecting plate 56 ₂ and the rear connecting plate 61 ₂ respectively L. In this embodiment, the extension lines L ₁ and L ₂ of the axes of a pair of bolts 64 and 64 are set between the upper end of the steering handle 32 supported by the head pipe 25 and the axle 31 of the front wheel WF , the above-mentioned connecting surface is arranged at a position close to the head pipe 25, and even if an assembly error occurs when the rear frame 24 is assembled to the front frame 23, the center line C in the width direction relative to the rear frame 24 can be The displacement amounts δ ₁ and δ ₂ of the position of the head pipe 25 are suppressed to be smaller.

On the other hand, as shown in FIG. 25( a), if it is assumed that the connection surface between the rear end of the front frame 23 and the front end of the rear frame 24 is not inclined forward and downward but is substantially horizontal, the head tube 25 On the projection drawing projected on the plane parallel to the connecting surface of the rear end of the front part frame 23 and the front end of the rear part frame 24 of the above-mentioned connection surface, as shown in FIG. Displacement amount of the position of the head pipe 25 with respect to the center line C in the width direction of the rear frame 24 when an assembly error occurs when the rear frame 24 is assembled to the front frame 23 at a position away from the head pipe 25 δ ₁ and δ ₂ are relatively large.

In addition, since the rear connecting plates 61 ₁ , 61 ₂ overlap the front connecting plates 56 ₁ , 56 ₂ from below, there is no need to securely place the rear frame 24 above the rear ends of the floor support frames 27 ₁ , 27 ₂ Space. Therefore, the footrest floor 41b can be arranged above the rear ends of the floor support frames 27 ₁ , 27 ₂ , and the space for the footrest 41 b can be set large.

Since the fitting recesses 58... are provided at the rear ends of the floor support frames ₂₇₁ , ₂₇₂ , and the fitting protrusions 63... fitted in the fitting recesses 58... are projected on the front end of the rear member 24, it is possible to The assembly accuracy when connecting and assembling the front frame 23 and the rear frame 24 is improved.

And, by arranging the fitting recesses 58 ... and the fitting protrusions 63 ... at three or more places of the connecting portion between the rear ends of the floor support frames 27 ₁ , 27 ₂ and the front end of the rear frame 24 , the In this embodiment, there are three positions, which can further improve the assembly accuracy of the front frame 23 and the rear frame 24 .

In the front frame 23, since the down frame 26 is formed in a groove shape with an open bottom, the front wheel WF can be arranged close to the down frame 26 without reducing the cross-sectional shape of the down frame 26, and the front wheel WF and the down frame can be avoided. 26 and fully ensure the space of the pedal floor 41b, the wheelbase can also be shortened.

In addition, since the left and right pair of floor support frames 27 ₁ and 27 ₂ are respectively formed in the shape of grooves with upper openings, due to the external force acting on the vehicle body frame F, the upper opening areas of the floor support frames 27 ₁ and 27 ₂ are reduced. The deflection occurs in a variable manner, whereby the ride comfort can be increased.

Moreover, reinforcing ribs 52 extending in the front-rear direction are respectively provided on the bottom plate support portions 27 ₁ , 27 ₂ , so that the two bottom plate support members 27 ₁ , 27 ₂ can be deflected due to external forces, and at the same time, the two bottom plate support members 27 1 , 27 2 can be prevented from being bent. The rigidity of the support members 27 ₁ , 27 ₂ is extremely reduced.

Furthermore, since the front ends of the floor supporting members 27 ₁ and 27 ₂ are respectively arranged on both sides of the lower end of the down frame 26, the footrest floor 41b can be arranged on both sides of the lower end of the down frame 26, and the wheelbase can be adjusted without enlarging the wheelbase. In the case of this, a space for the footrest bottom plate 41b is sufficiently secured on the front side.

Since the front ends of the floor supporting frames 27 ₁ and 27 ₂ are respectively connected and arranged on both sides of the lower end of the lower frame 26 through a pair of curved portions 50 ₁ and 50 ₂ that bulge forward than the front of the lower end of the lower frame 26, although they are arranged separately The front ends of a pair of linear floor support frames 27 ₁ , 27 ₂ are pushed forward by connecting the lowering frame 26 and the two floor support frames 27 ₁ , 27 ₂ , that is, the two curved portions 50 ₁ , 50 ₂ to the front. Therefore, the strength of the above-mentioned connection setting portion can be sufficiently increased.

In addition, by ensuring the distance from the front wheel WF by using the recesses 51 ... provided on the inner sides facing each other of the curved parts 50 ₁ and 50 ₂ , the front wheel WF and the curved parts 50 ₁ and 50 ₂ sides can be separated. Therefore, by connecting the front ends of the two floor support frames 27 ₁ , 27 ₂ to the lowering frame 26 through the bent portions 50 ₁ , 50 ₂ , the wheelbase can be prevented from becoming large.

A pair of left and right engine side brackets 67 ₁ , 67 ₂ provided on the engine E are connected to the anti-vibration link 66 swingably supporting the engine E of the movable part P on the vehicle body frame F. The beam 69 between the pair of left and right links 68 ₁ , 68 ₂ of the vehicle body frame F is formed in a substantially U-shape with an open bottom, and is disposed on the front side of the two links 68 ₁ , 68 ₂ to straddle and connect them. The position of the intake pipe 83 between the carburetor 35 and the engine E on the rear side of the connecting rods 68 ₁ and 68 ₂ . Therefore, compared with the case where the carburetor 35 is arranged on the front side of both the links 68 ₁ and 68 ₂ , the degree of freedom in the arrangement of the carburetor 35 is increased.

The engine E is a 4-stroke engine arranged substantially horizontally. By disposing a beam 69 between the storage box 39 installed on the vehicle body frame F under the seat 42 and the engine E, the beam 69 is secured by avoiding interference with the storage box 39. While the free movement of 69, also can prevent the position of seat 42 from becoming high.

Furthermore, since the frame main part 24a which is the main part of the rear part of the main frame 21 in the vehicle body frame F is provided with an opening 87, the opening 87 is provided for the upper end of the rear buffer member 33. The buffer side bracket 86 is inserted, and the buffer mounting part 88 protruding above the frame main part 24a across the opening 87 is provided on the frame main part 24a, and the buffer side bracket 86 is mounted on the buffer mounting part 88. Therefore, the shock absorber side bracket 86 can be set at a higher position, the stroke of the rear shock absorber 33 can be further increased, and the riding comfort of the driver can be improved.

Since the subframe 22 constituting the vehicle body frame F in cooperation with the main frame 21 is connected to the main frame 21 at a position corresponding to the connection installation portion of the shock absorber mounting portion 88 connected to the frame main portion 24a, The strength of the bumper mounting portion 88 protruding from the frame main portion 24 can be reinforced by the sub frame 22 .

As another embodiment of the present invention, it is also possible to connect the front connecting plates 56 1 , 56 2 at the rear end of the front frame 23 with the bolts having an axis extending along the width direction of the vehicle body frame F and the front connecting plates 56 ₁ and 56 ₂ provided on the rear frame. 24 and the rear connecting plates 61 ₁ , 61 ₂ overlapping with the front connecting portion plates 56 ₁ , 56 ₂ .

In this case, the fitting recesses 58 on the front connecting plates 56 ₁ , 56 ₂ ... and the fitting protrusions 63 on the rear connecting plates 61 ₁ , 61 ₂ sides fitted with the respective fitting recesses 58 ... The extension line of the axis of ... is set to pass between the upper end of the steering handle 32 and the axle 31 of the front wheel WF, so that the positional deviation of the head pipe 25 relative to the centerline C in the width direction of the rear frame 24 can be further reduced.

As mentioned above, although the Example of this invention was described in detail, this invention is not limited to the said Example, Various design changes are possible without deviating from this invention described in a patent claim.

For example, in the above-mentioned embodiment, the case where the front frame 23 and the rear frame 24 are formed by casting has been described, but the present invention can also be applied to molding the front frame 23 and the rear frame with synthetic resin. The case of frame 24. In addition, in the above-mentioned embodiment, the fitting recess 58 is provided on the front connecting plates 56 ₁ , 56 ₂ , and the fitting protrusion 63 is provided on the rear connecting plates 61 ₁ , 61 ₂ . The protrusions 63 are provided on the front connecting plates 56 ₁ , 56 ₂ , and the fitting recesses 58 are provided on the rear connecting plates 61 ₁ , 61 ₂ .

As described above, according to the first invention, when an assembly error occurs between the rear frame and the front frame, the positional deviation of the head pipe relative to the centerline in the width direction of the rear frame can be suppressed to be relatively small.

According to the second invention, when an assembly error occurs between the rear frame and the front frame, the positional deviation of the head pipe relative to the centerline in the width direction of the rear frame can be suppressed to be smaller.

According to the third invention, when an assembly error occurs between the rear frame and the front frame, the positional deviation of the head pipe relative to the centerline in the width direction of the rear frame can be suppressed to be smaller, and the mutual connection can be improved. Assembly accuracy when the front frame and rear frame are assembled into the body frame.

According to the fourth invention, the footrest floor can be arranged above the rear end of the floor support frame, and the space for the footrest floor can be greatly set.

According to the fifth invention, the assembly accuracy of the front frame and the rear frame can be further improved.

Claims (4)

1. A body frame for a scooter type vehicle, the scooter type vehicle comprising a front frame (23) and a rear frame (24), the front frame (23) being molded and having a The head pipe (25) supporting the front wheel (WF) in the steering direction, the rear frame (24) is molded into a shape extending rearward and upward, and is connected to the rear end of the front frame (23). It is characterized in that the rear connecting plates (61 ₁ , 61 ₂ ) are connected to the front connecting plates (56 ₁ , 56 ₂ ), and the front connecting plates (56 ₁ , 56 ₂ ) are arranged on the above-mentioned front frame ( 23) is inclined forward and downward, and the rear connecting plates (61 ₁ , 61 ₂ ) are arranged at the front end of the rear frame (24) and are inclined forward and downward, and overlapped with the above-mentioned front connecting plate (56 ₁ , 56 ₂ ); The extension line (L) of the axis of at least one of the plurality of bolts (64) connecting the front connecting plate (56 ₁ , 56 ₂ ) and the rear connecting plate (61 ₁ , 61 ₂ ) is set to pass through the steering direction Between the upper end of the handle (32) and the axle shaft (31) of the front wheel (WF), the above-mentioned steering direction handle (32) can carry out steering direction operation and is supported by the above-mentioned head pipe (25). 2. The body frame for a scooter-type vehicle according to claim 1, wherein one of said front connecting plate (56 ₁ , 56 ₂ ) and said rear connecting plate (61 ₁ , 61 ₂ ) is Fitting protrusions (63) are protrudingly provided on the top, and fitting recesses (58) for fitting the fitting protrusions (63) are provided on the above-mentioned front connecting plates (56 ₁ , 56 ₂ ) and the above-mentioned rear connecting plates. On the other side of (61 ₁ , 61 ₂ ), the extension line of the axis of the above-mentioned fitting protrusion (63) and the above-mentioned fitting recess (58) passes through the upper end of the steering handle (32) and the wheel of the front wheel (WF). Between (31), this manipulation direction handle (32) can carry out manipulation direction operation, and is supported by above-mentioned head tube (25). 3. The body frame for a scooter-type vehicle according to claim 1 or 2, wherein the front frame (23) integrally has a head pipe (25), and a head pipe (25) is formed backward from the head pipe (25). The lowering frame (26) extending downward, the floor support frame (27 ₁ , 27 ₂ ) extending rearward from the lower end of the lowering frame (26) and arranged under the footrest floor (41b), the above-mentioned rear connecting plate ( 61 ₁ , 61 ₂ ) are superimposed on the above-mentioned front connecting plate (56 ₁ , 56 ₂ ) from below, and the front connecting plate (56 ₁ , 56 ₂ ) is arranged at the rear of the floor supporting frame (27 ₁ , 27 ₂ ). end. 4. The body frame for a scooter type vehicle according to claim 2, wherein a pair of left and right front connecting plates (56 ₁ , 56 ₂ ) provided on the front frame (23) In the whole connecting part with the pair of left and right rear connecting plate parts (61 ₁ , 61 ₂ ) provided on the above-mentioned rear frame (24), the above-mentioned fitting protrusion (63) and the above-mentioned fitting recess (58) ) are arranged in multiple locations of 3 or more locations.

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