Title of Invention

A MOTOR SCOOTER

Abstract

1. A motor scooter characterized in that a front portion of a vehicle body frame attached with a front wheel via a swing arm and said front portion of said vehicle body frame is installed with a head pipe , a middle portion of the vehicle body frame is mounted with a step floor for mounting feet and a rear portion of the vehicle body frame is attached with a rear vehicle via a swing type power unit, the vehicle body frame is constructed by a constitution in which a front frame is coupled to a rear frame dividably at a position below the said step floor.

Full Text

FORM 2 THE PATENTS ACT 1970 [39 OF 1970] COMPLETE SPECIFICATION [See Section 10] "A MOTOR SCOOTER" HONDA GIKEN KOGYO KABUSHIKI KAISHA, a corporation of Japan, having a place of business at 1-1, Minamiaoyama 2-chome, Minato-ku, Tokyo, Japan, The following specification particularly describes the nature of the invention and the manner in which it is to be performed:- ORIGINAL 46/MUMNP/2000 GRANTED 3-2-2004 [Prior Art] As a technology related to a scooter type motorcycle of a style of attaching a front wheel via a swing arm, for example, there is provided Japanese Unexamined Patent Publication No. Hei 2-175483 "Front wheel suspension apparatus of scooter type vehicle". According to the above-described technology, in reference to Fig. 1 and Fig. 2 of the publication, a rear frame 3 is extended upwardly from rear end portions of a pair of left and right floor pipes 2 installed with a feet mounting plate 17 (numerals described in the publication are cited, the same as follows), a rear wheel 5 is attached to the rear frame 3 via rear arms 4a and 4b and an engine 8 is mounted at rear portions of the floor pipes 2, erected pipes 10 are extended upwardly from front end portions of the floor pipes 2, a head pipe 12 is attached to upper end portions of the erected pipes 10 via stays 11, a bar handle 15 is supported by the head pipe 12, underbrackets 20 are extended forwardly from the front end portions of the floor pipes 2, a lower arm 21 is attached to the underbrackets 20 swingably in an up and down direction and a front wheel 31 is attached to a front end portion of the lower arm 21 to thereby constitute a scooter type "motorcycle. (Problems to be Solved by the Invention] According to the above-described conventional technology, there is constituted an integrated frame 1 by bonding the rear frame 3, the erected pipes 10, the stays 11, the head pipe 12 and the underbrackets 20 to the floor pipes 2. The frame 1 integrated in this way is integrated with (1) the rear wheel 5 via the rear arms 4a and 4b and a rear suspension system comprising a hydraulic pressure damper 6 and the like, integrated with© the front wheel 31 via a front suspension system comprising a hydraulic pressure damper 38 and the like and integrated with(3) a steering system of the bar handle 15, a shaft 40, a steering arm 30 and the like. However, in assembling a scooter type motorcycle, generally, in a final assembly line, the front and the rear suspension systems and the steering system are integrated to the frame 1. Various kinds of parts are integrated to the comparatively large-sized frame 1 and therefore, an operational space is large, when the operational space is large, an operational range of an operator becomes wide, the burden of the operator is increased and therefore, there is a room for improvement. Further, in the final assembly line, all the parts are integrated to the frame 1 and therefore, the final assembly line is obliged to be large-sized and complicated. Further, the erected pipes 10 as well as the under brackets 20 are welded to the front end portions of the floor pipes 2 . Owing to bonding by welding, control of respective dimensional accuracies is not easy with regard to pivot positions of the underbrackets 20 for supporting the lower arm 21 and a position of the head pipe 12 . Accordingly, a number of controlling steps is increased. Hence, it is an object of the present invention (1) to promote integrating operational performance and simplify a final assembly line and (2) to facilitate respective dimensional accuracies of pivot positions of stays for supporting swing arms and a position of a head pipe in a scooter type motorcycle of a style of attaching a front wheel via the swing arms. [Means for Solving the Problems] In order to achieve the above-described object, a scooter type motorcycle according to Claim 1, a front portion of a vehicle body frame is attached with a front wheel via a swing arm and installed with a head pipe, a middle portion of the vehicle body frame is mounted with a step floor for mounting feet and a rear portion of the vehicle body frame is attached with a rear wheel via a swing type power unit, the vehicle body frame is constituted so that a front frame is coupled to a rear frame dividably at a position below the step floor. By partially integrating the front suspension system, the steering system and the front wheel to the front frame, there is provided a partially assembled body of the front portion. By partially integrating the swing type power unit and the rear wheel to the rear frame, there is provided a partially assembled body of the rear portion. The partially assembled body of the front portion and the partially assembled body of the rear portion which are respectively provided, are integrated to thereby complete a scooter type motorcycle. The front portion and the rear portion are partially integrated separately and accordingly, the integrating operational performance is promoted. In the final assembly line, the rear frame may be coupled to the front frame which is partially assembled separately and the final assembly line can be simplified. A scooter type motorcycle according to Claim 2, characterized in that a front portion of a vehicle body frame is installed with a head pipe and attached with a front wheel via stays and a swing arm extended forwardly, a middle portion of the vehicle body frame is mounted with a step floor for mounting feet and a rear portion of the vehicle body frame is attached with a rear wheel via a swing type power unit, the front portion of the vehicle body frame is constituted of an integrated cast article including the stays as well as the head pipe. Owing to the integrated cast article, in forming the front portion of the vehicle body frame, the position of the head pipe and the positions of the stays are self-evidently determined relative to the vehicle body frame. As a result, the pivot positions of the stays for supporting the. swing arms are also self-evidently determined relative to the position of the head pipe. Accordingly, it is easy to control the respective dimensional accuracies of the position of the head pipe and the positions of the pivots. Accordingly, the present invention relates to a motor scooter characterized in that a front portion of a vehicle body frame attached with a front wheel via a swing arm and said front portion of said vehicle body frame is installed with a head pipe , a middle portion of the vehicle body frame is mounted with a step floor for mounting feet and a rear portion of the vehicle body frame is attached with a rear vehicle via a swing type power unit, the vehicle body frame is constructed by a constitution in which a front frame is coupled to a rear frame dividably at a position below the said step floor. Brief Description of the ACCOMPANYING Drawings Fig. 1 is a left side view of a scooter type motorcycle according to the present invention. Fig. 2 is a left side view around a vehicle body frame according to the present invention. Fig. 3 is a plane view of the vehicle body frame, front and rear suspension systems and a steering system according to the present invention. Fig. 4 is a disassembled perspective view of the front suspension system according to the present invention. Fig. 5 is a left side view of the vehicle body frame according to the present invention. Fiq 6 is a view viewed from an arrow 6 in Fig. 5. Fiq 7 is a view viewed from an arrow 7 in Fig. 5. Fiq 8 is a side sectional view of a coupling portion of the vehicle body frame according to the present invention. Fig 9 is a rear face of a constitution in which a main stand is attached to a rear frame according to the present invention. Fiq 10 is an exPlanatory view for explaining a procedure of integrating the scooter type motorcycle according to the present invention- Fiq 11 iiiustrates views of a modified example of the front framp according to the present invention. An explanation will be given as follows of embodiments according to the present invention in reference to the attached drawings. Further, "front", "rear", "left", "right", "upper", "lower" follow directions viewed from a driver and notation Fr designates a front side, notation Fr designates a rear side, notation L designates left side and notation R designates right side. Further, the drawings are viewed in directions of the notations. Fig. 1 illustrates a left side view of a scooter type motorcycle according to the present invention. According to a scooter type motorcycle 1 (hereinafter, simply referred to as "motorcycle 1"), a vehicle body frame 2 in a frame-like shape is arranged at a central lower portion, a front portion of the vehicle frame 2 is attached with a front suspension system 4 in a swing arm style for suspending a front wheel 3 and a steering system 5 separately from the front suspension system 4, a rear frame of the vehicle body frame 2 is attached with a swing type power unit 6 and a rear suspension system 8 for suspending a rear wheel 7 and a rear upper portion of the vehicle body frame 2 is attached with a seat 9.' In the power unit 6, an engine 6a constitutes a drive source. According to the motorcycle 1, the vehicle body is further surrounded from a front side to a rear side, a front fender 11, a front cover 12, a handle cover 13, a leg shield 14 for covering feet portions of a driver, a step floor 15 for mounting feet of the driver (low floor type feet mounting plate), an undercover 16, a center cover 17, a rear cover 18 and two pieces of rear fenders 19F and 19R on the front side and on the rear side. The step floor 15 is a resin product integrally formed with the leg shield 14, is mounted above a middle portion 2M of the vehicle body frame 2 and is fastened thereto by screws. The middle portion 2M of the vehicle body frame 2 is provided with a dividing line W at a position below the step floor 15 and at the position of the dividing line W, a rear frame 2R is coupled to a front.frame 2F dividably. A detailed constitution of the vehicle body frame 2 will be described later . Further, a main stand 93 and a side stand 95 are attached to a rear lower portion of the vehicle body frame 2 . A description will be given later in respect of a structure of attaching these stands 93 and 95. In the drawing, numeral 21 designates a mirror, numeral 22 designates a head lamp, numeral 2 3 designates a winker, numeral 24 designates a radiator, numeral 25 designates a carrier, numeral 26 designates a tail lamp, numeral 27 designates an exhaust pipe and numeral 28 designates a muffler. Fig. 2 is a left side view around the vehicle body frame according to the present invention. According to the front suspension system 4, stays 31 are extended forwardly from the front portion of the vehicle body frame 2, a base end of a swing arm 33 in a U-shaped in side view, is attached to the stays 31 by a front pivot shaft 32 swingably in the up and down direction, a wheel shaft holder block 35 is attached to a front end of the swing arm 33 via a king pin 34 pivotably in the left and right direction and the front wheel 3 is rotatably attached to the wheel shaft holder block 35 via a wheel shaft 36. That is, the swing arm 33 is extended forwardly from the front portion of the vehicle body frame 2 and supports the front wheel 3 by the swing arm 3 3 in a cantilever style. Further, according to the front suspension system 4, a resin spring 43 for alleviating impact in the swing direction of the swing arm 33, that is, impact from a road face and a front damper 47 for alleviating an amplitude of vibration in the swing direction of the swing arm 33, are separated from each other. In details, the resin spring 43 for alleviating impact in the swing direction of the swing arm 33 is interposed between the vehicle body frame 2 and the swing arm 33 and the swing arm 33 is suspended at the front portion of the vehicle body frame 2 by the front damper 47 . The resin spring 43 is a damping member comprising a block made of a resin having elasticity for carrying out spring action. Specifically, according to a structure of attaching the front damper 47, one end portion of the front damper 47 is attached to a right side portion (rear side of the drawing) of a base portion of a head pipe post 51, mentioned later, by a pivot shaft 48 and other end portion of the front damper 47 is attached to a left side portion of a top portion of the swing arm 33 by a pivot shaft 49. Further, the one end portion of the front damper 47 may directly be attached to the vehicle body frame 2. According to the steering system 5, the head pipe post 51 is extended from the front upper portion of the vehicle.body frame 2 in a forward skew direction, a head pipe 52 is formed at a front end.of the head pipe post 51, a steering stem 53 in a vertical direction is attached to the head pipe 52 rotatably in the left and right direction, a bar handle 54 is attached to an upper, end portion of the steering stem 53, further, a base end portion of a steering arm 55 is attached to a lower end portion of the steering stem 53 and a knuckle 35a of the wheel shaft holder block 35 is connected to a front end portion of the steering arm 55 via a link mechanism 56 to thereby steer the front wheel 3. Numeral 57 designates a grip. As described above, there is adopted the front suspension system 4 of the swing arm style, large load from the front wheel 3 is received by the vehicle body frame 2 having high rigidity via the swing arm 33 as well as the front pivot shaft 32 and accordingly, the large load can firmly and effectively be received by the vehicle body frame 2 . Therefore, the large load is not operated on the head pipe post 51. According to the rear suspension system 8, a rear arm 61 is extended from a rear end portion of the vehicle body frame 2 to the rear upper portion, a stay 62 is fastened to the rear arm 61 by bolts, the power unit 6 is attached to the stay 62 by a rear pivot shaft 63 swingably in the up and down direction, the rear wheel 7 is attached to the power unit 6, further, the power unit 6 is suspended from the rear arm 61 by a rear cushion 64. The rear cushion 64 is arranged on the front side of the rear wheel 7 in the drawing, one end portion thereof is attached to an attachment boss 65 of the rear arm 61 by a pivot shaft 66 and other end portion thereof is attached to a stay 6b of the power unit 6 by a pivot shaft 67. Fig. 3 is a plane view of the vehicle body frame, the front and the rear suspension systems and the steering system. The drawing shows (1) that the swing arm 33 is extended forwardly from the front portion of the vehicle body frame 2 while being bent to right to detour the front wheel 3, (2) that the steering arm 55 is extended forwardly from the head pipe 52 disposed on a vehicle body center CL while being bent to right to detour the front wheel 3 and (3) that the power unit 6 is extended rearwardly from the rear portion of the vehicle body frame 2 and the rear wheel 7 is supported by the power unit 6 in a cantilever style. The swing arm 33 is offset from the vehicle body center CL to one side (right side) and the power unit 6 is offset from the vehicle center CL to other side (leftside) and accordingly, left and right weight balance is excellent in the motorcycle 1. Fig. 4 is a disassembled perspective view of the front suspension system according to the present invention. The drawing explains the constitution of the front suspension system 4 further in details, showing that a support pipe 33a of the swing arm 33 is attached to pivot holes 31a of left and right ones of the stays 31 by the front pivot shaft 32, a sandwiching plate 41 is connected to connecting portions 33c formed at a plate portion 33b of the swing arm 33 by two upper and lower pairs of bolts and nuts 42, the resin spring 43 is sandwiched by the plate portion 33b and the sandwiching plate 41, an attaching plate 44 is inserted through an attaching hole 43a of the resin spring 43, two left and right end portions of the attaching plate 44 are attached to attaching bosses 45 of the vehicle body frame 2 by bolts 46, further, the one end portion of the front damper 47 is attached to an attaching boss 51a at a base portion of the head pipe post 51 by the pivot shaft 48 and the other end portion of the front damper 47 is attached to an attaching boss 33d at the top portion of the swing arm 33. Fig. 5 is a left side view of the vehicle body frame according to the present invention, showing a specific constitution of the vehicle body frame 2. The dividing line W of the vehicle body frame 2 is a line extended from an upper face of the vehicle body frame 2 which is substantially horizontal toward a rear skew direction in side view. The vehicle body frame 2 is dividable into the front frame 2F and the rear frame 2R at the position of the dividing line W. The rear arm 61 is continuously extended from the rear end portion of the rear frame 2R in side view. '■. ;■>'■" Fig. 6 is a view viewing Fig. 5 in an arrow mark direction 6, showing a planar constitution of the front frame 2F, that is, the front portion of the vehicle body frame. The front frame 2F is a frame member substantially in a square shape in plane view comprising left and right side members 71, a front cross member 72 spanning front ends of the side members 71 and a rear cross member 73 spanning rear ends of the side members 71, further, an integrated cast article is constituted thereby including the left and right stays 31 formed by extending forwardly front ends of the side members 71, the head post 51 extended from the front upper portion of the cross member 72 in a front skew direction and the head pipe 52 installed at the front end of the head pipe post 51. Since the front portion of the vehicle body frame 2 is constituted of the integrated cast article including the stays 31, the head post 51 and the head pipe 52, in forming the front portion of the vehicle body frame 2, positions of the stays 31 as well as a position of the head pipe 52 are self-evidently determined relative to the vehicle body frame 2. As a result, the positions of the pivot holes 31a of the stays 31 for supporting the swing arm 33 (refer to Fig. 2), that is, the pivot positions are also self-evidently determined relative to the position of the head pipe 52. Accordingly, control of respective dimensional accuracies of the position of the head pipe 52 and the pivot positions is facilitated. :Further, by further forwardly extending the front ends of the side members 71, the left and right stays 31 are formed, the front portion of the vehicle body frame 2 is constituted of the integrated cast article including these stays 31 and therefore, large load operated on the stays 31 from the front wheel 3 shown by Fig. 2 via the swing arm 33, can efficiently be transmitted to the side members 71 and can be received by a total of the vehicle body frame 2. Since the load is received by the total of the vehicle body frame 2 , the total of the vehicle body frame 2 can be constituted of a rational thin-walled member. As a result, light weight formation and low price formation of the vehicle body frame 2 can be achieved. Such a front frame 2F is constituted of a die-cast article of an aluminum alloy. Since the front frame 2 is constituted of the frame member having substantially the square shape in plane view, the rigidity of the front frame 2F can be promoted. The left and right side members 71 are provided with dividing faces 74 on rear upper faces thereof and four pieces of the coupling bolt holes 75 ••• (••• designates plurality, the same as follows) are perforated at the dividing faces 74. Fig. 7 is a view viewing" Fig. 5 in an arrow mark 7 direction, showing a rear face constitution of the rear frame 2R, that is, the rear portion of the vehicle body frame. As described above, the rear arm 61 is continuously extended from the upper portion of the rear end portion of the rear frame 2R. The rear frame 2R as well as the rear arm 61 is a frame member having substantially a square-like shape in rear view comprising left and right side members 81, a lower cross member 82 spanning rear lower ends of the side members 81 and an upper cross member 83 spanning upper ends of the side members 81. Further, the rear frame 2R is constituted of an integrated cast articled including the rear arm 61. Such a rear frame 2R is a die-cast article of an aluminum alloy. Since the rear frame 2R as well as the rear arm 61 is constituted of the frame member having the substantially square-like shape in rear view, the rigidity of the rear frame 2R can be promoted. The left and right side members 81 are provided with dividing faces 84 (refer to Fig. 5) at front lower faces thereof, four pieces of coupling bolt holes 85 ••• are perforated at the dividing faces 84, further, four pieces of stay attaching bolts 86 ••• for the power unit are perforated at rear faces thereof and four pieces of bolt holes 88 ••• for attaching four pieces of stand brackets are perforated at a rear lower inclined faces 87. The left side member 81 is installed with, the rear cushion attaching boss 65 at an upper side portion thereof. Notation P designates the center of the rear pivot shaft for the power unit. Fig. 8 is a side sectional view of a coupling portion of the vehicle body frame according to the present invention, showing that the dividing face 84 provided at the front end of the rear frame 2R is made to overlap the dividing face 74 provided at the rear end of the front frame 2F and coupled thereto by bolts and nuts 89 ••• inserted through the coupling bolt holes 75.•• and 85 •.• . In this way, the rear frame 2R can be coupled to the front frame 2F dividably at the position of the dividing line W. Since the dividing line W is constituted by an inclined line and accordingly, a pitch (separation distance) between the bolts and nuts 89 can be increased. Therefore, a rigidity of coupling the front frame 2F and the rear frame 2R can be promoted. Fig. 9 is a rear view of a constitution in which the main stand is attached to the rear frame according to the present invention, showing that left and right stand brackets 91 are attached to rear end portions (rear lower inclined faces 87) of the left and right side members 81 of the rear frame 2R by bolts 92 ••• , the main stand 93 having a gate-like shape in rear view is attached to the left and right stand brackets 91 swingably in the forward and rearward direction, further, the side stand 95 is attached to the left side brackets 91 swingably in the forward and rearward direction. The vehicle body frame 2 is provided with the large rigidity and accordingly, the main stand 93 can be swingably attached only by the left and right stand brackets 91. Therefore, a support pipe extended in a vehicle width direction which is conventionally regarded as indispensable can be abolished and light weight formation of the vehicle can be achieved. The main stand 93 is provided with a foot depressing portion 96 extended from a left rear portion thereof in a left rearward direction and the main stand 93 can be operated to erect by the foot depressing portion 96. Numerals 97 and 98 designate tension springs. Next, an explanation will be given of a procedure of assembling the motorcycle 1 having the above-described constitution in reference to Fig. 10. Fig. 10 is an explanatory view for explaining the procedure of assembling the scooter type motorcycle according to the present invention. (1) First, in a first partial assembly line, the front suspension system 4 as well as the steering system 5 of the swing arm 33, the front wheel 3 and the like, are partially assembled to the front frame 2F to thereby provide a partially assembled body 1F of the front portion. (2) Further, in a second partial assembly line, the rear suspension system 8 of the swing type power unit 6, the rear wheel 7, the rear cushion 64 and the like and the main stand 93 are partially assembled to the rear frame 2R to thereby provide a partially assembled body 1R of the rear portion. Further, at this step, a member of the seat 9 or the like shown by imaginary lines may be assembled. (3) Next, the dividing face 84 of the rear frame 2R is made to overlap the dividing face 74 of the front frame 2F and coupled thereto by bolts to thereby assemble the partially assembled body 1F of the front portion and the partially assembled body 1R of the rear portion which have been respectively fabricated into a semifinished vehicle. (4) Finally, in a final assembly line, various kinds of members of accessories, lamps, covers and the like are integrated to the above-described semifinished vehicle to thereby complete a scooter type motorcycle. As described above, owing to the scooter type motorcycle which has been coupled dividably, the partially assembled body 1F of the front portion and the partially assembled body 1R of the rear portion can be assembled by the first and the second partial assembly lines which are separate from each other and are small-scaled. The partially assembled bodies 1F and 1R of the front portion and the rear portion are small-sized in comparison with a finished vehicle and accordingly, an operational space for integrating respective parts can be made small. When the operational space is small, the operational range of the operator is narrowed and accordingly, burden on the operator can be alleviated. Therefore, the integrating operational performance can further be promoted. Further, the partially integrated bodies 1F and 1R of the front portion and the rear portion can be assembled at optimum arbitrary locations separately from the final assembly line. For example, the partially assembled bodies of the front portion and the rear portion can also be assembled at factories for fabricating respective parts constituting these assembled bodies. The rear wheel 7 and the main stand 93 is partially integrated to the rear frame 2R and accordingly, in the second partial assembly line, in assembling the partially integrated body 1R of the rear portion, the rear frame 2R.in the midst of assembling operation can be brought into a stable self standing state without using a special supporting jig. In the final assembly line, the rear frame 2R is only coupled to the rear frame 2F partially assembled separately, the final assembly line.can be simplified and the degree of freedom of design can be promoted in arranging the final assembly line in a limited space. Further, the final assembly line is provided with an operational space larger than those of the first and the second partial assembly lines. Although when the operational space is large, the operational range of the operator is liable to be widened and the burden on the operator is liable to increase, since the rear frame 2R is. coupled to the front frame 2F partially integrated separately and accordingly, a number of assembling steps at the final assembly line is reduced and as a result, the burden can be alleviated. Further, the rear frame 2R is coupled to the front frame 2F partially assembled separately at a position below the step floor 15 (refer to Fig. 1) having further excellent integrating performance and accordingly, the integrating operational performance is further promoted. Figs. 11(a) and 11(b) are views of. a modified example of the front frame according to the present invention, Fig. 11(a) shows a constitution of the left side face of the front frame and Fig. 11(b) shows a constitution of viewing Fig. 11(a) in a direction of an arrow mark b. The front frame 2F of the modified example is featured in that the front portion of the front cross member 72 is integrally formed with the left and right stays 31 which are extended forwardly. Other constitution of the front frame 2F is the same as the constitution shown by Fig. 5, Fig. 6 and Fig. 8, described above, the same notations are attached thereto and an explanation thereof will be omitted. Further, according to the above-described embodiments of the present invention, a drive source of the power unit 6 is not limited to the engine 6A but may be, for example, an electrically driven motor or a hybrid of an electrically driven motor and the engine 6a. The vehicle body frame 2 according to the present invention specified by Claim 1 may be of a constitution in which the frame 2R is coupled dividably to the rear frame 2R at a position below the step floor 15 and the constitution of the cast article is arbitrary. The vehicle body frame 2 according to the present invention specified by Claim 2 may be of an integrated cast article in which at least a front portion thereof includes the stays 31 and the head pipe 52, further, the integrated cast article is not limited to a die-cast article of an aluminum alloy, furthermore, it is arbitrary to divide the front frame 2F from the rear frame 2R. [Effect of the Invention] The present invention achieves the following effects by the above-described constitution. According to Claim 1, the vehicle frame is constituted such that the rear frame is coupled dividably to the rear frame at the position below the step floor and accordingly, the scooter type motorcycle can be completed by partially integrating the front suspension system and the steering system to the front frame to thereby provide the partially integrated body of the f rontportion, partially integrating the swing type power unit to the rear frame to thereby provide the partially assembled body of the rear portion and integrating the partially assembled body of the rear portion to the partially assembled body of the front portion. Accordingly, the partially assembled body of the front portion and the partially assembled body of the rear portion can be integrated by small-scaled partial assembly lines which are separated from each other. The partially assembled bodies of the front portion and the rear portion are small-sized in comparison with a completed vehicle, resulting in making small the operational space for integrating respective parts. When the operational space is small, the operational range of the operator is narrowed and accordingly, the burden on the operator can be alleviated. Therefore, the integrating operational performance is further promoted. Further, the partially assembled bodies of the front portion and the rear portion can be integrated at optimum arbitrary locations separately from the final assembly line. At the final assembly line, the rear frame may only be coupled to the front frame partially integrated separately, the final assembly line can be simplified and the degree of freedom of design can be promoted for arranging the final assembly line to a limited space. Further, at the final assembly line, the operational space is larger than those of the partial assembly lines. Although when the operational space is large, the operational range of the operator is widened and the burden on the operator is liable to increase, since the rear frame is coupled to the front frame partially assembled separately, a number of assembling steps at the final assembly line is reduced and as a result, the burden can be alleviated. Furthermore, the rear frame is coupled to the front frame, partially assembled separately at the position below the step floor having the most excellent integrating performance and accordingly, the integrating operational performance is further promoted. According to Claim 2, the front portion of the vehicle frame is constituted of the integrated cast article including the head pipe and the stays and accordingly, in forming the front portion of the vehicle body frame, the position of the head pipe and the positions of the stays are self-evidently determined relative to the vehicle body frame. As a result, the pivot positions of the stays supporting the swing arms is self-evidently determined relative to the position of the head pipe. Therefore, control, of respective dimensional accuracies of the position of the head pipe and the pivot positions is facilitated. [Description of the Reference Numerals and Signs] 1 ••• Scooter type motorcycle, 1F ••• Partially assembled body of front portion, 1R ••• Partially assembled body of rear portion, 2 ••. vehicle body frame, 2M ••• Middle portion of vehicle body frame, 2F ••• Front frame, 2R ••• Rear frame, 3 •.. Front wheel, 4 ••• Front suspension system, 5 ••• Steering system, 6 ••• Swing type power unit, 7 ••• Rear wheel, 8 ••• Rear suspension system, 15 ..• Feet mounting step floor, 31 ••• Stay, 33 ••• Swing arm, 51 ••• Head pipe post, 52 ••. Head pipe, 74 ••• Dividing face of front frame, 84 ••• dividing face of rear frame, W .•• Dividing line. 1. A motor scooter characterized in that a front portion of a vehicle body frame attached with a front wheel via a swing arm and said front portion of said vehicle body frame is installed with a head pipe , a middle portion of the vehicle body frame is mounted with a step floor for mounting feet and a rear portion of the vehicle body frame is attached with a rear vehicle via a swing type power unit, the vehicle body frame is constructed by a constitution in which a front frame is coupled to a rear frame dividably at a position below the said step floor. 2. A motor scooter as claimed in claim 1, wherein said front portion of said vehicle body frame is attached with said front wheel via stays and said swing arm extended forwardly, the said front portion of the vehicle body frame is constituted of an integrated cast article including the stays as well as' the head pipe. 3. A motor scooter substantially as herein described with reference to the accompanying drawings. DATED THIS THE 13TH DAY OF JANUARY, 2000 [RANJNA MEHTA-DUTT] OF REMFRY & SAGAR ATTORNEYS FOR THE APPICANTS

Documents:

46-mum-2000-cancelled pages-(03-02-2004).pdf

46-mum-2000-claims(granted)-(03-02-2004).doc

46-mum-2000-claims(granted)-(03-02-2004).pdf

46-mum-2000-correspondence(28-07-2004).pdf

46-mum-2000-correspondence(ipo)-(18-08-2004).pdf

46-mum-2000-drawings)-(03-02-2004).pdf

46-mum-2000-form 1(13-01-2000).pdf

46-mum-2000-form 2(granted)-(03-02-2004).doc

46-mum-2000-form 2(granted)-(03-02-2004).pdf

46-mum-2000-form 3(03-02-2004).pdf

46-mum-2000-form 3(13-01-2000).pdf

46-mum-2000-form 4(28-07-2004).pdf

46-mum-2000-form 5(13-01-2000).pdf

46-mum-2000-petition under rule 137(03-02-2004).pdf

46-mum-2000-petition under rule 138(03-02-2004).pdf

46-mum-2000-power of authority(01-02-2000).pdf

46-mum-2000-power of authority(03-02-2004).pdf

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