JP2016145014A - Frame structure of scooter type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame structure of a scooter type vehicle, capable of ensuring an article storage space with sufficient size, and reducing weight by reducing a number of components.SOLUTION: A frame structure of a scooter type vehicle has a down frame 13 extended from a head pipe 12 diagonally downward; an end frame 14 fixed at a rear end of the down frame 13 while crossing in a vehicle width direction; and a single body frame 15 extended from the end frame 14 diagonally upward and rearward to a vehicle body rear side. The single body frame 15 is arranged to be shifted to either one side of right and left sides in the vehicle width direction, from a rising portion to a seat rear portion.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a frame structure of a scooter type vehicle.

  In a scooter type vehicle in which a low-floor type footboard is disposed between a handle and a seat, a body frame is configured by a frame assembly such as a down frame, left and right side frames, a square pipe frame, and a seat pipe. (See Patent Document 1). In this scooter type vehicle, a square pipe frame and a seat pipe extend rearward and upward on both the left and right sides in the vehicle width direction, and the rear end of the frame is bridged by a reinforcing plate to form a scooter type. It constitutes the rear frame structure of the vehicle.

  In the rear frame structure of the scooter type vehicle, among the left and right frames under the seat, the square pipe frame on the side where the suspension unit is attached is thickened, and the opposite side seat pipe is formed thin so as to reduce the weight.

  In Patent Document 2, the front end of a single rear pipe disposed under a seat is connected to the rear end of a main pipe from a head pipe, a cross pipe is passed between the main pipe and the rear pipe, A two-wheeled vehicle reinforced by forming a triangle with a rear pipe and a cross pipe is described.

Japanese Patent No. 4041143 JP 2000-280965 A

  In the frame structure of the scooter type vehicle described in Patent Document 1, a thick square pipe frame and a thin seat pipe are disposed below the seat, and the article storage box formed below the seat is regulated by the left and right frame frames, It is difficult to expand the article storage space.

  In Patent Document 2, the rear pipe constituting the rear frame structure of the two-wheeled vehicle constitutes a strength member, and is arranged in the vicinity of the center line of the vehicle body from the center of the vehicle body to the rear of the vehicle body. It is difficult to secure the space below the seat, and it is not possible to secure an article storage space larger than the fuel tank. Moreover, the vehicle described in Patent Document 2 is not a scooter type vehicle, and cannot provide a scooter type vehicle having a sufficient article storage space.

  The present invention has been made in consideration of the above-described circumstances, and provides a frame structure for a scooter-type vehicle that can secure a sufficient space for storing articles, reduce the number of parts, and reduce the weight. With the goal.

  The frame structure of the scooter type vehicle according to the present invention includes a down frame extending obliquely downward from the head pipe and an end fixed to the rear end of the down frame by crossing in the vehicle width direction in order to solve the above-described problem. And a single body frame extending obliquely upward from the end frame to the rear of the vehicle body, and the single body frame is either left or right in the vehicle width direction from the rising portion to the seat rear portion It is characterized in that it is arranged in a shifted manner.

  Further, in order to solve the above-described problem, the frame structure of the scooter type vehicle according to the present invention is fixed to the down frame extending obliquely downward from the head pipe and the rear end of the down frame by crossing in the vehicle width direction. An end frame, a single body frame extending obliquely upward from the end frame to the rear of the vehicle body, and a unit swing type disposed on the opposite side to the single body frame in the vehicle width direction in plan view of the vehicle An engine transmission case; a swing arm that connects a swing center of the unit swing type engine and a rear wheel shaft support, and is disposed between a muffler and a rear wheel; and the single body The frame is shifted from the rising part to the rear part of the seat and shifted to either the left or right side in the vehicle width direction. The swing arm is attached to the lower side of the rear suspension unit. There are formed, the upper mounting portion of the rear suspension unit is characterized in that provided in the rear suspension mounting bracket of the body frame.

  In the present invention, since a single body frame is offset to one side in the vehicle width direction and configured by one, a sufficient space for storing articles can be secured, and the number of parts can be reduced to reduce weight and cost. Can do.

1 is an overall vehicle view showing a left side surface of a scooter type vehicle according to a first embodiment. The vehicle side view which shows the rear part side removal state of the vehicle body cover from the scooter type vehicle of 1st Embodiment from the left side. The vehicle side view which shows the rear part side removal state of a vehicle body cover from the scooter type vehicle of 1st Embodiment from the right side. The vehicle top view (plan view) which shows the state which removed the sheet | seat and the vehicle body cover from the scooter type vehicle of 1st Embodiment. The left view which shows the state which attached the goods storage box and the fuel tank to the frame structure of the scooter type vehicle which concerns on this embodiment. Similarly, the right view which shows the state which attached the article storage box and the fuel tank to the frame structure of the scooter type vehicle. The side view which looked at the frame structure of the scooter type vehicle from the left side. The top view which similarly looked at the frame structure of the scooter type vehicle from the upper part. Similarly, the front view which looked at the frame structure of the scooter type vehicle from the front. (A) is a top view of the frame structure of the scooter type vehicle which respectively provided the body frame and the seat rail in the vehicle width direction both sides, (B) is a top view which shows the frame structure of the scooter type vehicle which concerns on 1st Embodiment. The perspective view which looked down the frame structure of the scooter type vehicle which concerns on 2nd Embodiment from the vehicle body right side. The side view which looked at the frame structure of the scooter type vehicle which concerns on 2nd Embodiment from the vehicle body right side. The top view which looked at the frame structure of the scooter type vehicle which concerns on 2nd Embodiment from upper direction. The right side view which shows the layout relationship of the unit swing type engine with which a scooter type vehicle of 2nd Embodiment is equipped, a swing arm, a muffler, and an air cleaner. The top view which shows the layout relationship of the unit swing type | mold engine with which the scooter type vehicle of 2nd Embodiment is equipped, a swing arm, a muffler, a transmission case, and an air cleaner.

  Embodiments according to the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a left side view of an entire vehicle showing a first embodiment of a scooter type vehicle to which the present invention is applied. FIGS. 2 and 3 respectively show a state in which a rear portion of a vehicle body cover is removed from a scooter type vehicle. It is the left view and right view which show. FIG. 4 is a top view of the vehicle showing a state in which the seat and the vehicle body cover are removed from the scooter type vehicle. 1 to 4, reference numeral FW indicates the vehicle front side when viewed from a rider riding the scooter type vehicle, and reference numeral RW indicates the vehicle rear side of the scooter type vehicle. Reference symbol L indicates the left side of the scooter type vehicle toward the front of the vehicle, and reference symbol R indicates the right side of the scooter type vehicle toward the front of the vehicle.

  1 to 4, the scooter type vehicle 10 has a body frame 11. The vehicle body frame 11 has a head pipe 12 at the foremost portion thereof, and is bent from the rear lower portion of the head pipe 12 obliquely downward or downward and curved, and extends substantially horizontally rearwardly. An end frame (cross frame) 14 fixed to the rear end portion of the frame 13 by crossing in the vehicle width direction, and a single body extending from one side of the end frame 14 in the vehicle width direction, for example, from the left side to the rear upper side A frame assembly is mainly composed of the frame 15.

  The vehicle body frame 11 of the scooter type vehicle 10 is covered with a vehicle body cover 17 around the vehicle body 11, and the vehicle body cover 17 constitutes the appearance of the vehicle. The vehicle body cover 17 is configured by combining a plurality of cover elements. The cover element includes, for example, a front cowl 18, a front leg shield 19, a front rear shield 20, a lower leg shield 21, a body frame cover 22, a rear frame cover 23, and the like.

  The scooter type vehicle 10 is configured such that the space between the seat 25 and the handle 26 is deeply curved in a U shape, and a low floor type footboard 27 is disposed at the bottom of the U shape curved portion. The rider seated on the seat 25 takes a riding posture in which the user rides with the feet on the footboard 27.

  A steering shaft is rotatably supported on the head pipe 12 of the vehicle body frame 11, and the handle 26 is connected to a front fork 28 via the steering shaft. A front wheel 29 is supported at the lower portion of the front fork 28, and the front wheel 29 that is a steering wheel is operated by steering the handle 26.

  Furthermore, a unit swing type engine 30 is provided at a substantially central lower portion of the body frame 11. The unit swing type engine 30 has a suspension bracket at the front lower portion thereof supported by a suspension bracket at the rear lower side of the center lower portion of the vehicle body frame 11 through a link mechanism so as to be swingable.

  The unit swing type engine 30 is integrally provided with an engine main body 31 and a transmission case 32 extending rearward from the vehicle width direction side of the unit case of the engine main body 31. The transmission case 32 also serves as a swing arm. The transmission case 32 is provided with a lower attachment portion of the rear suspension unit 33 at the upper portion thereof, and an upper attachment portion of the rear suspension unit 33 is provided on the rear suspension attachment bracket 34 of the single body frame 15 and is elastically elastic. Supported. A transmission case 32 extends rearward from one side of a unit case (engine case) of the unit swing type engine 30, and a rear portion of the transmission case 32 is elastically supported by a rear suspension unit 33, and a driving wheel is mounted on a rear end portion of the case. The rear wheel 35 is pivotally supported.

  1 to 4, reference numeral 37 denotes a front fender, reference numeral 38 denotes a rear fender, and reference numeral 39 denotes a muffler.

  On the other hand, the body frame 11 of the scooter type vehicle 10 is provided with a pair of side frames 40 and 40 on both lower sides just before the curved portion of the down frame 13 as shown in FIGS. The side frames 40, 40 have a pipe shape or a tube shape, and extend downward from the left and right sides of the down frame 13 and extend downward to bend. Further, the side frames 40, 40 extend from the lower curved portion to the vehicle rear side so as to gradually expand in a substantially horizontal direction or obliquely rearward upward, thereby constituting a foot frame. The left and right side frames 40, 40 are curved from the vicinity of the end frame 14 at the rear end of the down frame 13 and end up obliquely rising rearward. The rear ends of the left and right side frames 40, 40 are connected to the left and right step frames 41, 41.

  The left and right side frames 40, 40 constituting the foot frame are fixed and reinforced at both ends of the end frame 14 via brackets on the way. The left and right side frames 40, 40 are provided with support brackets 43, 44 that protrude outward in the vehicle width direction in the vehicle longitudinal direction. The footboard 27 is installed on these support brackets 43 and 44.

  Further, the base portions of the left and right step frames 41 and 41 are directly joined and fixed to the rising portions of the body frame 15 and the center frame 45, respectively. The left and right step frames 41, 41 reinforce the rear ends of the side frames 40, 40, while a passenger's step board 46 is provided on the step frames 41, 41. The step board 46 is provided integrally or separately from the foot board 27.

  The vehicle body frame 11 of the scooter type vehicle 10 is constituted by a pipe-like or tube-like structural member that forms a strength member. An end frame 14 is fixed to the rear end of the down frame 13 by crossing in the vehicle width direction. A single body frame 15 is provided, for example, on the left side on one side in the vehicle width direction of the end frame 14 constituting the cross frame. The single body frame 15 is composed of a square pipe shape, a round pipe shape, a rail-like structural member, and a strength member, and extends obliquely upward toward the rear of the vehicle. The single body frame 15 is arranged so as to be shifted to the left or right in the vehicle width direction from the rising portion to the seat rear portion, for example, to the left side.

  The single body frame 15 is curved inward in the vehicle width direction at the rear of the vehicle, and forms, for example, a U-shaped, L-shaped, or U-shaped rear end side curved portion. The single body frame 15 of the scooter type vehicle 10 is a strength member, and is constituted by a pipe-like or frame-like structural member having a size having sufficient rigidity for maintaining steering stability.

  The rear side of the vehicle body of the body frame 15 extends from the side of the body frame 15 that is disposed offset to one side in the vehicle width direction and ends in a direction opposite to the vehicle width direction in the vehicle plan view. The rear end side bending portion is configured. The seat mounting bracket 47 is fixed to the upper surface of the rear end side curved portion of the body frame 15, and the fuel tank mounting portion is provided in a multistage shape below the seat mounting bracket 47.

  Further, the seat mounting bracket 47 and the tank mounting bracket 48 may be provided in the upper and lower multi-stage shape at the rear end side curved portion of the body frame 15. The tank mounting bracket 48 is fixed to the body frame 15 below the seat mounting bracket 47.

  Further, as shown in FIGS. 8 and 9, the end frame 14 of the vehicle body frame 11 has a tube shape or a pipe shape on the opposite side (for example, the right side) of the mounting (fixing) portion of the single body frame 15 in the vehicle width direction. The center frame 45 is fixed. The center frame 45 rises upward or rearward and curves inward in the vehicle width direction, and a flat portion in the vehicle width direction is formed at the upper part after the curve. A front mounting bracket 51 of the article storage box 50 is provided on the flat portion of the center frame 45. The other end side of the center frame 45 is fixed inside the rising portion of the single body frame 15. The center frame 45 is a structural member of a bridge frame or a cross frame that connects the other end portion of the end frame 14 and the rising portion of the body frame 15. By joining the other end side of the center frame 45 directly to the side surface of the body frame 15 as a strength member, it is possible to reduce the number of joining members such as brackets to the body frame 15.

  The center frame 45 is a structural member that forms a cross frame, like the end frame 14 that is a structural member, and has a substantially vehicle width between the other end of the end frame 14 and the single body frame 15 that is a strength member. A single body frame 15 that is stretched in the direction and attached in a cantilever manner is reinforced.

  In the frame structure of the scooter type vehicle 10 shown in FIGS. 5 to 9, the single body frame 15 is separated by shifting to one side in the vehicle width direction, for example, the left side of the end frame 14 constituting the rear body frame. One end of the center frame 45 is provided on the other side of the end frame 14 in the vehicle width direction, for example, on the right side, and the other end of the center frame 45 is directly fixed inside the rising portion of the body frame 15. The center frame 45 reinforces the single body frame 15 by straddling the rear frame of the end frame 14 substantially in the vehicle width direction. The body frame 15 and the center frame 45 may be attached to the end frame 14 at opposite sides in the vehicle width direction.

  Further, the scooter-type vehicle 10 may omit the end frame 14 instead of providing the end frame 14 crossed at the rear end portion of the down frame 13. When the end frame 14 is omitted, a frame structure in which a single body frame is directly provided on one of the left and right sides of the rear end of the down frame 13 and a center frame is provided on the other side of the down frame 13 may be employed. The single body frame is fixed to one side in the vehicle width direction and rises rearward and upward and extends to the rear side of the vehicle body, while the center frame is fixed to the other side of the rear end of the down frame 13 and the other in the vehicle width direction. It curves to the side, rises upward or rearward after the curve, curves again inward in the vehicle width direction, and a flat portion in the vehicle width direction is formed in the upper part after the curve. The center frame is provided with a front mounting bracket 51 of the article storage box 50 on this flat portion, and the other end side of the center frame is fixed to the inside of the rising portion of the single body frame 15 without constituting a seat rail. May be.

  The single body frame 15 constituting the rear body frame of the scooter type vehicle 10 is reinforced by a center frame 45 whose front side rising portion also serves as a cross frame, and an article storage box 50 is illustrated on the center frame 45. 2 to 4 and FIGS. 5 and 6 are installed. A fuel tank 55 is installed on the vehicle rear side of the article storage box 50.

  The fuel tank 55 is a steel plate tank configured by combining upper and lower tank case members. In the fuel tank 55, for example, an outer peripheral flange 56 is formed in the upper part of the tank. The outer peripheral flange 56 of the fuel tank 55 is overlapped with a tank mounting bracket 48 at the rear of the tank, and is fastened with fastening bolts or the like at two tank mounting portions in the vehicle width direction.

  The outer peripheral flange 56 of the fuel tank 55 is installed on the tank mounting bracket 57 at the front of the tank (front side of the vehicle). As shown in FIGS. 8 and 9, the tank mounting bracket 57 is fixed to the inside of the single body frame 15 and ends in a cantilever-like shape protruding inward in the vehicle width direction.

  The tank mounting bracket 57 is fixed in a cantilever shape inside a single body frame 15 that is, for example, a square pipe-like or round pipe-like structural member or a strength member, and is near the vehicle center line CL (see FIG. 8). It extends to the end. The outer peripheral flange 56 of the fuel tank 55 is overlapped with the tank mounting bracket 57 and fastened. The fuel tank 55 is formed of a steel plate tank and is stably fastened by supporting at least three points, one at the front of the tank and two at the rear of the tank.

  The tank mounting bracket 57 may be provided inside the single body frame 15 so as to extend beyond the vehicle body center line CL. The tank mounting bracket 57 is extended to the opposite side in the vehicle width direction, the front outer peripheral flange 56 of the fuel tank 55 is overlapped with the tank mounting bracket 57 in the vehicle width direction, and the tank front portion is fastened at two locations in the vehicle width direction. Also good.

  Further, the fuel tank 55 is constituted by a steel plate tank, and can be fastened to the single body frame 15 at least at three positions in the front and rear. The fuel tank 55 can constitute a structural member together with the body frame 15 and can reinforce the rear body frame. .

  In addition, when the tank mounting bracket 57 fixed to the single body frame 15 is extended and the tank mounting portions are provided on the left and right sides in the vehicle width direction across the vehicle body center line CL, the rear portion (flange) of the article storage box 50 is The fuel tank 55 is superposed on the outer peripheral flange 56 and can be fastened together with the fuel tank 55 at two locations in the vehicle width direction.

  The article storage box 50 has two rear mounting locations at the rear of the box, and the box front is fixed to the front mounting bracket 51 of the center frame 45 at two locations in the vehicle width direction as shown in FIG. As shown in FIG. 4, the article storage box 50 is fastened to the front mounting bracket 51 at two locations, and the box rear portion is overlapped with the outer peripheral flange 56 of the fuel tank 55 to provide two locations in the vehicle width direction. It is fixed with.

  Accordingly, the article storage box 50 is fastened at four positions in the front and rear portions of the box, and an article storage chamber 58 such as a helmet is formed inside the box. The front part of the seat 25 installed on the article storage box 50 is hinged to the article storage box 50, and the rear part of the seat 25 is fastened to the seat mounting bracket 47 at two locations in the vehicle width direction. It is stably installed above the article storage box 50 and the fuel tank 55.

  In the scooter type vehicle 10 of the present embodiment, the steel plate fuel tank 55 is used as a strength member by supporting and fastening the steel plate fuel tank 55 at least at three points to the single body frame 15 constituting the rear frame of the vehicle body. Can be used. The rear part (flange) of the article storage box 50 can be overlapped on the outer peripheral flange 56 of the fuel tank 55 and fixed at two locations in the vehicle width direction. The front part of the article storage box 50 is a front mounting bracket of the center frame 45. It can be fixed on 51 at a plurality of locations in the vehicle width direction. Therefore, the article storage box 50 can be stably fixed at three or more places, for example, four places, before and after the box. Since the rear part of the article storage box 50 is fastened together with the outer peripheral flange 56 of the fuel tank 55, a dedicated support (attachment) member is not required at the rear part of the box and can be eliminated.

  As shown in FIGS. 8 and 9, the scooter type vehicle 10 of the present embodiment is provided with a single body frame 15 shifted (displaced) to one side in the vehicle width direction. As shown in FIGS. 1 to 3, a unit swing type engine 30 is provided on the single body frame 15 side so as to be swingable in the vertical direction. A transmission case 32 (also serving as a unit case) of the unit swing type engine 30 extends to the rear side of the vehicle and rotatably supports the axle of the rear wheel 35 at the rear end portion of the case.

  A lower mounting portion of the rear suspension unit 33 is provided at the upper rear portion of the transmission case 32 of the unit swing type engine 30. The upper mounting portion of the rear suspension unit 33 is configured by a rear suspension mounting bracket 34 of a single body frame 15. The rear suspension unit 33 is provided between the single body frame 15 and the transmission case 32, and elastically supports the transmission case 32, which also serves as a swing arm, so that it can swing around the swing center of the unit swing type engine 30. doing.

  At that time, the scooter type vehicle 10 is constituted by a single body frame 15 in which a rear body frame is disposed to be shifted (shifted) to one side in the vehicle width direction. In addition, it is not necessary to arrange the square pipe frame and the seat pipe on both sides, and one side pipe such as a seat rail can be eliminated. The rear frame of the vehicle body is composed of a single body frame 15 that is offset to one side in the vehicle width direction, and one side pipe such as a seat rail can be abolished on the opposite side, so the space for the abandoned one side pipe is used as a storage space. be able to. It has been found that even if the rear body frame is constituted by the single body frame 15, sufficient rigidity and strength can be obtained from the frame strength analysis by the computer.

  In addition, by configuring the single body frame 15 with a seat rail such as a square pipe frame, T-shaped or H-shaped frame, the body frame 15 can easily select and manage the material dimensions of the vertical and horizontal widths. The frame strength and the storage space can be secured in a balanced manner, and the degree of freedom in design can be improved.

  Moreover, in the frame structure of the scooter type vehicle 10 of the present embodiment, as shown in FIG. 10A, the body frame 15 is attached to the end frame 14 that crosses the rear end of the down frame 13 and is fixed in the vehicle width direction. There is no need to provide it on both sides. In the frame structure of the scooter type vehicle 10, as shown in FIG. 10B, the single body frame 15 may be shifted from the vehicle body center line CL to one side in the vehicle width direction. A single body frame 15 is arranged in a cantilever shape on one side in the vehicle width direction on the end frame 14 that is a cross frame, and there is no need to provide a one-side pipe such as a seat rail on the other side in the vehicle width direction. By disposing the single body frame 15 in a shifted manner, the scooter type vehicle 10 can secure a large space in the body cover 17, and this space is effectively used and utilized as a layout space for each part. can do.

  Therefore, the layout space A that expands from the end frame 14 to the upper part of the rear wheel 35 can be expanded in the vehicle width direction from the layout space B shown in FIG. For this reason, in the frame structure of the scooter type vehicle 10 of FIG. 10B, the layout space A in a plan view of the vehicle can be expanded, and the article storage box can be installed in a place where a conventional pipe such as a seat rail is disposed. 50 and the fuel tank 55 can be expanded and disposed, the component storage space can be expanded, and the degree of freedom of component placement can be improved.

[Effect of the first embodiment]
In the frame structure of the scooter type vehicle of the present embodiment, the single body frame 15 can be shifted to one side in the vehicle width direction, and can be configured as a single body, reducing the number of parts and reducing weight and cost. Can do.

  Since the single body frame 15 is shifted to one side in the vehicle width direction and the one side frame such as the seat rail can be abolished on the other side in the vehicle width direction, the space for the abandoned one side frame can be used as a storage space, The degree of freedom of space usage can be improved.

  Further, the rear body frame of the vehicle body can be disposed without problems in terms of strength by turning the rear end of the frame from the single body frame arrangement side to the opposite side in the vehicle width direction. Furthermore, by using a steel plate tank for the fuel tank 55, the fuel tank 55 itself can be used as a structural member that also serves as a strength member, and the frame structure is reinforced and simplified.

  Furthermore, the frame structure of the scooter type vehicle of the present embodiment is such that the other side of the end frame 14 facing the fixed position of the body frame 15 provided on one side (one side) in the vehicle width direction of the end frame 14 (also serving as a cross frame). A center frame 45 is fixed to the center frame 45. The center frame 45 is raised upward and then curved inward in the vehicle width direction, and the rear end portion of the frame is directly joined to the rising portion of the single body frame 15 and fixed. Therefore, a joining member such as a bracket is not required for the single body frame 15, and the number of parts can be reduced. Further, the rising portion of the single body frame 15 can be reinforced by the bent center frame 45 constituting the bridge frame.

  At that time, when the center frame 45 is made of a tube material or a pipe material, the bending workability is also good. Moreover, since the front mounting bracket 51 is joined to the flat portion of the center frame 45, workability and workability are improved, and productivity can be improved.

  In addition, in the frame structure of the scooter type vehicle, when the left and right side frames and step frames arranged in the vehicle width direction below the footboard 27 are made of a tube material or pipe material having good workability, workability is also improved. . When the left and right step frames 41, 41 are directly joined to the rising portions of the center frame 45 and the body frame 15, joining members such as brackets can be eliminated, and the frame structure is simplified.

  Furthermore, the vehicle body rear frame is composed of a single body frame 15 shifted to one side in the vehicle width direction, and a frame such as a seat rail can be abolished on the opposite side in the vehicle width direction. The layout space can be expanded, and the capacity of the box container of the article storage box 50 and the tank capacity of the fuel tank 55 can be increased.

  The frame structure of the scooter type vehicle is such that the load of the rider is also received from the seat 25 on the upper surface of the fuel tank 55, but the fuel tank 55 is a steel plate tank and has a single body frame 15 at least at three points before and after the tank. Therefore, the support structure is stable and the load of the rider or the like can be sufficiently supported.

  Moreover, in the frame structure of the scooter type vehicle, the rear part of the article storage box 50 is shared with the attachment part of the steel plate fuel tank 55, so that the number of parts can be reduced, and the weight and cost can be reduced. Further, the support member dedicated to the storage box can be eliminated by configuring the fuel tank 55 with a steel plate tank and supporting the rear portion of the article storage box 50 on the left and right sides of the vehicle width direction with the steel plate fuel tank.

[Second Embodiment]
FIGS. 11-15 shows 2nd Embodiment of the frame structure of a scooter type vehicle.

  In the frame structure of the scooter type vehicle shown in the second embodiment, the transmission case 32 of the unit swing type engine 30 and the single body frame 15 are arranged to face each other in the vehicle width direction in the vehicle plan view. Applied to the vehicle frame structure. In the vehicle frame structure of the second embodiment, the same members as those of the scooter type vehicle frame structure according to the first embodiment are denoted by the same reference numerals, and redundant description is omitted or simplified.

  11 is a perspective view showing the state of the frame structure of the scooter type vehicle as viewed from the right side of the body frame 11A, FIG. 12 is a right side view showing the frame structure of the scooter type vehicle, and FIG. It is a top view which similarly shows the frame structure of a scooter type vehicle. 11 to 13, the symbol FW represents the vehicle front side in the frame structure of the scooter type vehicle, and the symbol RW represents the vehicle rear side. Reference symbol R indicates the vehicle body right side of the frame structure of the scooter type vehicle, and symbol L indicates the vehicle body left side.

  In the body frame 11A of the scooter type vehicle, a single body frame 15 is fixed in a cantilever shape on the other side in the vehicle width direction of the end frame 14 that also serves as a cross frame, for example, on the right side. The single body frame 15 is shifted (displaced) to the other side in the vehicle width direction from the rising part to the rear of the seat, and extends rearward and ends. A seat mounting bracket 47 is provided on the inner side in the vehicle width direction on the upper side of the rear end portion of the single body frame 15 to constitute a vehicle body rear frame. A tank mounting bracket 48 is provided below the seat mounting bracket 47 on the upper rear end of the body frame 15. The seat mounting bracket 47 and the tank mounting bracket 48 are configured in a stepped step structure having two upper and lower stages.

  The end frame 14 of the body frame 11A is provided with suspension brackets 65, 65 projecting rearward on both left and right sides in the vehicle width direction. One suspension bracket 65 is provided on one side of the end frame 14 in the vehicle width direction, and a support frame 67 that rises rearward and upward is fixed. The other suspension bracket 65 reinforces the single body frame 15 that rises rearward and upward from the other side in the vehicle width direction of the end frame 14, and extends from the rear side of the end frame 14 to the rising portion of the single body frame 15. Fixed.

  A unit swing type engine 30A is provided on the suspension bracket 65 at the rear of the end frame. The unit swing type engine 30A is provided with a suspension bracket 68 at a lower front portion of a unit case 70 which also serves as an engine case, and the suspension bracket 68 is connected to a suspension bracket 65 protruding rearward from the end frame 14 via a connecting member (not shown). The

  The unit swing type engine 30A is integrally provided with a transmission case 32A on one side, for example, the left side, of a unit case 70 that is an engine case. The transmission case 32A extends to the rear of the vehicle body on one side in the vehicle width direction, and supports the rear wheel 35 at the rear end portion of the case. Reference numeral 69 denotes a reinforcing bridge frame that spans the rising portions of the single body frame 15 and the support frame 67, and the seat front mounting bracket 51 may be provided on the bridge frame 69. Good.

  On the other hand, as shown in FIGS. 14 and 15, a swing arm 71 is integrally provided on the other side in the vehicle width direction of the unit case 70 of the unit swing type engine 30A, for example, the right rear portion. The swing arm 71 extends to the vehicle body rear side on the other side in the vehicle width direction, and faces the transmission case 32A of the unit swing type engine 30A on both sides in the vehicle width direction. The axle of the rear wheel 35 is supported at the arm rear end of the swing arm 71. The axle of the rear wheel 35 is rotatably supported by the case rear end of the transmission case 32 </ b> A and the arm rear end of the swing arm 71.

  The swing arm 71 is disposed between the rear wheel 35 and the muffler 39 as shown in FIGS. 13 and 15 in a plan view of the vehicle. The swing arm 71 is provided on the other side in the vehicle width direction so as to face the transmission case 32A of the unit swing type engine 30A in a plan view of the vehicle, and the single body frame 15 is also provided on the other side in the vehicle width direction. . The single body frame 15 and the swing arm 71 are disposed so as to face each other up and down, and the rear suspension unit 33 is provided therebetween. The swing arm 71 is provided with a lower attachment portion of the rear suspension unit 33, and an upper attachment portion of the rear suspension unit 33 is attached to a rear suspension attachment bracket 34 fixed to the single body frame 15.

  The swing arm 71 is supported by the rear suspension unit 33 together with the transmission case 32A of the unit swing type engine 30A so as to swing up and down around the swing center O of the unit swing type engine 30A. Therefore, the swing arm 71 connects the swing center O of the unit swing type engine 30A and the rear wheel shaft support portion.

  Further, when the transmission case 32A and the swing arm 71 of the unit swing type engine 30A are arranged on both the left and right sides in the vehicle width direction in the vehicle plan view, the rear suspension unit 33 is moved to the other side in the vehicle width direction, for example, the right side. Therefore, the single body frame 15 does not exist above the transmission case 32A. Therefore, a wide space can be secured above the transmission case 32A, and the cleaner capacity of the air cleaner 72 disposed on the transmission case 32A can be increased using this space. The air cleaner 72 may be disposed over the unit case 70 of the unit swing type engine 30A.

[Effects of Second Embodiment]
The scooter type vehicle frame structure according to the second embodiment has the same effects as the frame structure according to the first embodiment, and a single body frame is provided on the transmission case 32A of the unit swing type engine 30A. A large space can be secured above the transmission case 32A without being disposed, and the air cleaner 72 is disposed above the transmission case 32A using this space. Therefore, the cleaner capacity of the air cleaner 72 can be increased.

  Moreover, since it is not necessary to dispose the rear suspension unit on the transmission case 32A side where the air cleaner 72 is disposed, the air cleaner 72 does not need to be provided with a guide groove (relief groove) for the rear suspension on the crankcase side. The cleaner capacity of the air cleaner can be further increased.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be applied to a three-wheeled scooter type vehicle, can be implemented in various forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. Can do. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Scooter type vehicle 11, 11A ... Body frame, 12 ... Head pipe, 13 ... Down frame, 14 ... End frame, 15 ... Body frame, 17 ... Body cover, 18 ... Front cowl, 19 ... Front leg shield, 20 ... front rear shield, 21 ... lower leg shield, 22 ... body frame cover, 23 ... rear frame cover, 25 ... seat, 26 ... handle, 27 ... footboard, 28 ... front fork, 29 ... front wheel, 30, 30A ... unit Swing type engine, 31 ... engine body, 32, 32A ... transmission case, 33 ... rear suspension unit, 34 ... rear suspension mounting bracket, 35 ... rear wheel, 37 ... front fender, 38 ... rear fender, 39 ... muffler, 40 ... side Frame (Foot frame 41) Step frame, 43, 44 ... Support bracket, 45 ... Center frame, 46 ... Step board, 47 ... Seat mounting bracket, 48 ... Tank mounting bracket, 50 ... Article storage box, 51 ... Front mounting Bracket, 55 ... fuel tank, 56 ... outer peripheral flange, 57 ... tank mounting bracket, 58 ... article storage chamber, 65 ... suspension bracket, 67 ... support frame, 68 ... suspension bracket, 70 ... unit case, 71 ... swing arm, 72 ... Air cleaner.

Claims (13)

A down frame extending obliquely downward from the head pipe;
An end frame fixed to the rear end of the down frame by crossing in the vehicle width direction;
A single body frame extending obliquely upward from the end frame to the rear of the vehicle body,
The scooter-type vehicle frame structure according to claim 1, wherein the single body frame is disposed so as to be shifted to either the left or right side in the vehicle width direction from the rising portion to the seat rear portion. While the front end of the single body frame is fixed to one side in the vehicle width direction of the end frame,
The frame structure of the scooter type vehicle according to claim 1, wherein a rear end side curved portion is configured by bending a vehicle body rear side of the body frame inward in a vehicle width direction. A seat mounting bracket is fixed to the rear end side curved portion of the single body frame,
The frame of the scooter type vehicle according to claim 2, wherein a tank mounting bracket is fixed to the body frame below the seat mounting bracket, or a fuel tank mounting portion is provided below the seat mounting bracket. Construction. A center frame is fixed to the end frame on the end frame side opposite to the body frame fixing position on the end frame,
2. The center frame according to claim 1, wherein the center frame extends upward or rearward and curves inward in the vehicle width direction, a flat portion is formed at an upper portion after the curve, and the other end side of the center frame is fixed to the body frame. The frame structure of the described scooter type vehicle. The frame structure of the scooter type vehicle according to claim 4, wherein a bracket for mounting a front portion of an article storage box is provided on a flat portion of the center frame. A pair of left and right side frames that are curved and extended rearward from the left and right sides of the down frame are provided.
Left and right step frames are connected to the rear ends of the side frames,
The frame structure of the scooter type vehicle according to claim 1, wherein bases of the left and right step frames are respectively fixed to rising portions of the body frame and the center frame. The single body frame is provided on the transmission case side of the unit swing type engine in a plan view of the vehicle,
The lower mounting part of the rear suspension unit is provided at the rear upper part of this transmission case,
The frame structure of the scooter type vehicle according to claim 1, wherein the upper mounting portion of the suspension unit is provided on a rear suspension mounting bracket of the body frame. A box mounting bracket is fixed to the flat portion of the center frame,
The front part of the article storage box is fixed to the box mounting bracket,
The rear part of the article storage box is fixed at two box rear attachment points in the vehicle width direction,
The frame structure of the scooter type vehicle according to claim 4, wherein a fuel tank is installed at the rear of the vehicle body of the article storage box. The fuel tank is a steel plate fuel tank,
The fuel tank has a tank front portion provided in a tank mounting bracket extending from the body frame in a vehicle body center line direction, and a tank rear portion attached to two tank brackets in a vehicle width direction provided in a curved portion of the body frame,
The frame structure of the scooter type vehicle according to claim 8, wherein the fuel tank is fixed to the body frame with at least three support points. In the article storage box, one of the box rear mounting portions is overlapped with the fuel tank mounting portion on the body frame side and fastened to the tank mounting bracket, and the other box rear mounting portion is fastened to the outer peripheral flange of the fuel tank. The frame structure of the scooter type vehicle according to claim 8. In the article storage box, when the tank mounting bracket is extended beyond the vehicle body center line and the tank mounting portions are provided on the left and right sides in the vehicle width direction across the vehicle body center line, both the box rear mounting points are overlapped with the fuel tank. The frame structure of the scooter type vehicle according to claim 8, wherein the frame structure is fastened together with the tank mounting bracket. A down frame extending obliquely downward from the head pipe;
An end frame fixed to the rear end of the down frame by crossing in the vehicle width direction;
A single body frame extending obliquely upward from the end frame to the rear of the vehicle body;
A transmission case of a unit swing type engine disposed on the opposite side in the vehicle width direction in a vehicle plan view,
A swing arm that connects the swing center of the unit swing type engine and the rear wheel shaft support, and is disposed between the muffler and the rear wheel,
The single body frame is arranged by shifting from the rising part to the seat rear part on either side in the vehicle width direction,
The swing arm is formed with a lower attachment portion of the rear suspension unit,
A frame structure for a scooter type vehicle, wherein an upper mounting portion of the rear suspension unit is provided on a rear suspension mounting bracket of the body frame. A space is formed above the transmission case of the unit type engine,
The frame structure of the scooter type vehicle according to claim 12, wherein an air cleaner is disposed in the space.

Images