JP4452295B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle including a body frame.

  Conventionally, a motorcycle is provided with a body frame.

  In a motorcycle, it is desirable to improve the rigidity of the body frame.

  The present invention has been made to solve such problems, and an object thereof is to improve the rigidity of a body frame of a motorcycle.

  In order to achieve this object, a motorcycle according to the present invention includes a frame disposed below a seat, and the frame extends in the front-rear direction of the motorcycle body through the bottom of the seat. A pair of left and right longitudinally extending portions, and each longitudinally extending portion is formed by a vertical wall on the outside of the motorcycle, a vertical wall on the inside of the vehicle body, and an upper wall connecting the two walls. A further wall portion extending in the front-rear direction of the vehicle body of the motorcycle is directed inward in the vehicle width direction of the motorcycle. It is characterized by being erected.

  In each of the longitudinally extending portions, the height of the vertical wall inside the vehicle body may be larger than the width of the upper wall.

  Further, the further wall portion is formed wider than its thickness.

  The further wall portion may include a portion having a constant width.

  Further, the pair of left and right front-rear extending portions may be connected to each other at two locations separated from each other in the front-rear direction of the motorcycle body.

  Further, the further wall portion may extend between the two places where the pair of left and right front-rear extending portions are connected to each other.

  The frame may be formed by a mold that is divided in the vertical direction.

  Hereinafter, an embodiment of a motorcycle according to the present invention will be described in detail with reference to FIGS. Here, an example in which the present invention is applied to a scooter type motorcycle will be described. FIG. 1 is a side view of a scooter type motorcycle according to the present invention, FIG. 2 is a plan view of the frame, FIG. 3 is a side view of the front half of the upper frame, and FIG. FIG. 5 is a side view of the rear half of the upper frame, and FIG. 6 is a plan view of the same. FIG. 7 is a side view of the lower frame, and FIG. 8 is a plan view of the same. 9 is a cross-sectional view taken along the line IX-IX of the left down frame in FIG. 3, FIG. 10 is a cross-sectional view taken along the line XX in the longitudinal direction of the left side of the vehicle body in FIG. FIG. 12 is a perspective view of a vehicle body frame according to the present invention, and FIG. 13 is a cross-sectional view showing an example in which a frame member is formed in a lateral U-shape.

  In these drawings, what is denoted by reference numeral 1 is a scooter type motorcycle (hereinafter simply referred to as a scooter) according to this embodiment. The scooter 1 supports a unit swing type power unit 3 having a rear wheel 2 at the rear part of a vehicle body frame 4. In FIG. 1, 5 indicates a front wheel, 6 indicates a front fork, 7 indicates a steering handle, 8 indicates a seat, and 9 indicates a vehicle body cover.

  The power unit 3 has a structure equivalent to that conventionally known, and the engine 10 and the transmission case 11 are integrally formed to support the rear wheel 2 at the rear end, Power is transmitted from the engine 10 to the rear wheel 2 via a V-belt type automatic transmission (not shown) provided in the transmission case 11. In FIG. 1, the reference numeral 12 provided above the transmission case 11 is an air cleaner for the engine 10. In the power unit 3, the upper portion of the crankcase 13 is swingably connected to the vehicle body frame 4 via power unit support brackets 14 and 15 (see FIG. 2), which will be described later, and the rear end portion of the transmission case 11 is arranged at the rear. It is connected to the rear end portion of the vehicle body frame 4 through the cushion unit 16. The rear cushion unit 16 has the same structure as that conventionally known, and includes a cushion spring and a hydraulic damper, although not shown.

  The vehicle body frame 4 includes an upper frame 23 that extends from a head pipe 21 that rotatably supports the front fork 6 and the steering handle 7 to a rear end portion of the vehicle body under the footrest portion 22 and the seat 8; The lower frame 24 extends downward from the middle of the upper frame 23. The upper frame 23 is made of an aluminum alloy, and the lower frame 24 is made of an iron-based alloy. That is, the weight of the vehicle body frame 4 is reduced by forming the upper portion with a relatively lightweight aluminum alloy.

  The upper frame 23 is divided into a front half 25 that extends from the head pipe 21 to the footrest 22 and a rear half 26 that is welded to the rear end of the front half 25 and extends to the rear end of the vehicle body. Is formed. As shown in FIGS. 3 and 4, the front half 25 includes a head pipe 21, a pair of left and right down frames 27, 27 extending rearwardly downward from the head pipe 21, and a space between the down frames 27. It is composed of two interposing cross members 28 and 29, and is formed by so-called gravity casting, and the above-mentioned parts are integrally formed. Gravity casting is a casting method in which molten metal is filled in a mold by gravity.

  As shown in FIG. 9, the down frame 27 is formed in a box shape having a closed cross section. Further, the front cross member 28 located on the head pipe 21 side of the two cross members 28 and 29 is formed so as to have a vertical cross section as shown in FIG. 29 is formed in the shape of a cross section. An attachment seat 30 for attaching a front end portion of the lower frame 24 described later is provided in the vicinity of the rear cross member 29 in both down frames 27.

  As shown in FIGS. 5 and 6, the rear half 26 of the upper frame 23 includes a left front-rear extending part 31 and a right front-rear extending part 32 extending in the front-rear direction of the vehicle body at both ends in the vehicle width direction. The first and third cross members 33 to 35 connecting these front and rear direction extending portions 31 and 32 at the front end portion, the center portion, and the rear end portion are formed by vacuum die casting. Thus, the respective parts are integrally formed.

  The left and right front-rear extending portions 31 and 32 are connected to the front-rear center portion of the vehicle body via the power unit support brackets 14 and 15 so that the front portion of the power unit 3 can swing in the vertical direction. A cushion unit bracket 36 for connecting the upper end portion of the rear cushion unit 16 is provided at the rear end portion of the longitudinally extending portion 31 on the left side of the vehicle body. Further, brackets 37 for connecting midway portions of the lower frame 24 described later are provided at the front end portions of the left and right longitudinally extending portions 31 and 32 so as to protrude downward.

  The two brackets 14 and 15 for supporting the power unit are provided so as to extend rearwardly and downwardly inside the vehicle body of the front and rear direction extending portions 31 and 32, and two brackets are provided on each of the front and rear direction extending portions 31 and 32. The cylindrical bosses 38 and 39 (see FIG. 5) provided are elastically supported via damper rubber (not shown). Further, a connecting rod 40 is horizontally mounted on the lower ends of the brackets 14 and 15, and the power unit 3 is supported by the connecting rod 40 so as to be swingable in the vertical direction. The connecting portion between the connecting rod 40 and the power unit 3 is arranged so that a cylindrical boss 41 (see FIGS. 2 and 6) is separated from the power unit 3 in the vehicle width direction and positioned on the same axis. The connecting rods 40 are passed through the bosses 41, and the bosses 41 are rotated with respect to the connecting rods 40.

  As shown in FIGS. 5 and 6, the cushion unit bracket 36 is formed so as to protrude downward at the rear end portion of the longitudinally extending portion 31 on the left side of the vehicle body. In this embodiment, the cushion unit bracket 36 is disposed in the vicinity of the third cross member 35 that connects the left and right longitudinally extending portions 31 and 32.

  Of the first to third cross members 33 to 35 that connect the left front-rear extending portion 31 and the right front-rear extending portion 32, the first end connecting the front end portions of both the front-rear extending portions 31, 32. The first cross member 33 and the second cross member 34 connecting the central portions are formed so that a large storage box (not shown) capable of storing a helmet can be mounted between them. Yes. That is, the rear surface of the first cross member 33 is formed so as to be gradually positioned forward as it goes to the center portion in the vehicle width direction, and the center portion in the vehicle width direction of the front surface of the second cross member 34 has both ends. It is formed so as to be located behind the part. In addition, the said storage box has taken the structure equivalent to what is mounted in the conventional scooter 1, and the opening of an upper end is opened and closed by the sheet | seat 8. FIG.

  As shown in FIG. 12, the third cross member 35 that connects the rear end portions of the left and right longitudinally extending portions 31 and 32 is formed in a box shape that opens upward, and the battery 42 is connected to the third cross member 35. It is stored. The third cross member 35 constitutes a battery storage box according to the present invention. An opening 43 for passing a cable (not shown) connected to the battery 42 is formed at the bottom of the third cross member 35 and on the rear side of the vehicle body.

  The rear half 26 composed of the left and right front-rear extending portions 31 and 32 and the first to third cross members 33 to 35 includes a front portion in a range indicated by symbol A in FIG. Are formed by using different molds for the rear portion in the range indicated by reference numeral B. The front part of the rear half 26 is formed by a mold that is divided in the vehicle width direction and a mold that is released upward from the mold, and the rear part is formed by a mold that is divided in the vertical direction. Yes.

  More specifically, as shown in FIG. 10, the front portion includes an upper wall 44 formed in a U-shaped cross section that opens upward, a lower wall 45 at the lower end portion, and both of these walls on the inside of the vehicle body. It is formed in a U-shape that opens to the side by a vertical wall 46 that connects the ends. A concave groove 47 extending in the front-rear direction of the vehicle body is formed inside the U-shaped portion of the upper wall 44, and an X-shaped reinforcement is seen in a portion between the upper wall 44 and the lower wall 45 in a side view. The ribs 48 are integrally formed.

  On the other hand, as shown in FIG. 11, the rear portion has a cross section opened downward by a vertical wall 49 outside the vehicle body, a vertical wall 50 inside the vehicle body, and an upper wall 51 connecting the upper ends of both walls. It is formed in a U shape. The upper wall 51 is formed in a U-shape that opens upward together with the upper extending portions 49a, 50a of the vertical walls 49, 50, and a concave groove 52 extending in the front-rear direction of the vehicle body is formed in this portion. Is formed. The concave groove 52 and the front concave groove 47 are formed in the left and right front-rear extending portions 31 and 32, respectively, but the concave grooves 47 and 52 formed in the front-rear front extending portion 31 on the left side of the vehicle body. Accommodates a cable 53 (see FIG. 10 and FIG. 11) made of wiring connected to a battery 42 at the rear end of the vehicle body, a main switch (not shown) in the vicinity of the steering handle 7, and the like.

  The cable 53 is fixed to the longitudinally extending portion 31 by a rubber clamp 54 while being accommodated in the concave grooves 47 and 52. The clamp 54 is formed by a clamp main body 54a having a C-shaped cross section into which the cable 53 is engaged, and a protrusion 54b extending downward from the clamp main body 54a, and the upper wall 44 of the longitudinally extending portion 31 is formed. , 51 is supported by the upper walls 44, 45 by engaging the projection 54b into the through hole 55 formed in the upper part. Instead of the cable 53, for example, a brake wire for operating a rear wheel brake (not shown) can be held in the front-rear direction extending portion 31, and both the cable 53 and the brake wire can be It can also be held by the direction extending portion 31.

  As described above, the rear half portion 26 is molded by the molds having different dividing directions, whereby the lateral rigidity at the front portions of the front and rear direction extending portions 31 and 32 can be improved, and the vertical direction at the rear portion. The rigidity of can be improved. The reason why the lateral rigidity of the front part of the front and rear direction extending parts 31 and 32 is improved is that this front part is connected to the two down frames 27 and 27 of the front half part 25 and a power unit. This is because the front part of 3 is connected and a load is applied mainly in the lateral direction during cornering.

  The down frame 27 of the front half 25 connected to the front portions of the front and rear extension portions 31 and 32 extends rearwardly downward, and the front end portions of the front and rear direction extension portions 31 and 32 extend vertically in the down frame 27. Since it is firmly supported, the upper frame 23 having high torsional rigidity can be formed by combining the front half part 25 and the rear half part 26. In this embodiment, as described above, since the reinforcing rib 48 having an X-shape in side view is provided on the inner side of the U-shape in the front portion having a U-shaped cross section, only the longitudinally extending portions 31 and 32 are provided. In this case, the rigidity in the torsional direction can be improved.

  The reason why the longitudinal rigidity is improved at the rear portions of the longitudinally extending portions 31 and 32 is that a cushion reaction force is applied from the rear cushion unit 16 to the rear portions. As a result, the allowable value of the cushion reaction force applied from the rear cushion unit 16 to the rear half 26 can be increased. In this embodiment, since the concave groove 52 (see FIG. 11) is formed on the upper surface of the rear part of the longitudinally extending portions 31, 32, the vertical rigidity can be further improved by the concave groove 52. .

  As shown in FIGS. 7 and 8, the lower frame 24 is horizontally installed between a pair of left and right pipes 61, 62 extending in the front-rear direction below the upper frame 23, and the pipes 61, 62. It is comprised from the 1st-4th cross members 63-66. As shown in FIG. 7, the pipes 61 and 62 are formed in a mountain shape that protrudes downward, and the front end is fixed to the front half 25 of the upper frame 23 by a fixing bolt 67, and the rear end The portion is fixed to the rear half 26 of the upper frame 23 via a connecting bracket 68. The connecting bracket 68 is formed in a box shape from an iron-based alloy equivalent to the pipes 61, 62, the lower end is welded to the pipes 61, 62, and the upper end is fixed to the rear half 26. (See FIG. 1).

  Further, the front end portions of the pipes 51 and 52 that extend in the front-rear direction on the lower side are provided so that the connecting plate 70 extends upward. The connecting plate 70 and the front end portion of the rear half portion 26 are provided. A bracket 37 provided so as to extend downward is fastened by a fixing bolt 71 as shown in FIG.

  These left and right pipes 61 and 62 are welded with stays 72 to 74 for supporting the lower portion of the vehicle body cover 9 and side stand support stays 75 and the like, and a radiator 76 is supported via a bracket (not shown). I am letting. The radiator 76 is of a horizontal water flow type equivalent to a well-known one, and as shown in FIGS. 1 and 7, the front of the radiator 76 is located below the front end portions extending rearwardly downward of the pipes 61 and 62. It is inclined and arranged so as to be directed upward. In this embodiment, a part of the cooling water passage between the radiator 76 and the engine 10 is formed by the pipes 61 and 62. A cooling water hose connecting the radiator 76 and the pipes 61, 62 is indicated by reference numeral 77, and a cooling water hose connecting the pipes 61, 62 and the engine 10 is indicated by reference numeral 78.

  Of the first to fourth cross members 63 to 66 connecting the pipes 61 and 62 of the lower frame 24, the first to third cross members 63 to 65 are formed of a steel plate, and the fourth cross member 66 is formed of a pipe. Further, as shown in FIG. 8, the third cross member 65 is formed in an X shape in a plan view, and the four places on the front, rear, left and right are welded to both pipes 61 and 62. The third cross member 65 supports a fuel tank 79 as shown in FIG. The fuel tank 79 is stored in a space formed above the third cross member 65 and between the storage box. The fourth cross member 66 is formed in a mountain shape that protrudes downward as viewed from the rear of the vehicle body, and a main stand bracket 80 is welded to the center in the vehicle width direction.

  In the scooter type motorcycle 1 configured as described above, the upper portion of the upper frame 23 is formed into a U-shaped cross section that opens upward by a mold, and the concave grooves 47 and 52 formed in the U-shaped section. Since the cable 53 is wired in the cable, the cable 53 can be temporarily held by the frame member by inserting the cable 53 into the concave grooves 47 and 52.

  The concave grooves 47 and 52 are dead spaces formed as a result of forming the U-shaped cross section in order to improve the rigidity of the frame member, and the cable 53 is wired in the dead space. The space around (the longitudinally extending portion 31 on the left side of the vehicle body) is not narrowed by the cable, and the degree of freedom of the mounting positions of the components provided in the vicinity of the frame member can be improved. Examples of the parts provided in the vicinity of the longitudinally extending portion 31 on the left side of the vehicle body include a luggage storage box and an electronic control device for engine control. Further, the cable 53 wired in the concave grooves 47 and 52 is protected by being surrounded by the front and rear direction extending portions 31 on both sides and the lower side, so that the cable 53 is rubbed by other parts and covered. There is nothing to break.

  In addition, the scooter 1 according to this embodiment is formed such that the rear portion of the rear frame 26 extends in the front-rear direction so that the concave groove 52 opens upward, and a battery storage box (third Since the cross member 35) is integrally formed, the cable 53 connected to the battery 42 can be inserted into the concave groove 52 from above and wired. For this reason, the relatively thick and difficult-to-handle cable 53 for power feeding can be easily wired, and the efficiency of wiring work can be further improved.

  In the embodiment described above, the concave groove for holding the cable is formed so as to open upward, but as shown in FIG. 13, it can also be formed so as to open in the lateral direction. FIG. 13 is a cross-sectional view showing another example of the frame member. In the figure, a frame member denoted by reference numeral 81 is formed in a laterally U-shape by a mold, and two reinforcing ribs 82 and 83 are erected on the inner side. In this example, a wiring 85 and a wire 86 such as a brake wire or a clutch wire are accommodated in a concave groove 84 formed by the upper reinforcing rib 82 and the upper wall 81a of the frame member 81.

  In order to fix these cables to the frame member 81, for example, the clamp 54 shown in FIGS. 10 and 11 can be erected on the reinforcing rib 82 and held by the clamp 54. The frame member 81 can be formed to extend in the vehicle width direction like a cross member in addition to being formed to extend in the front-rear direction of the vehicle body.

  According to the above, since the cable can be temporarily held by the frame member by inserting the cable into the recessed groove of the frame member, for example, when the cable is fixed to the frame member by the holding member, the cable is not held by hand. It's okay. This simplifies the wiring work and improves the work efficiency. Further, the concave groove is a dead space that is formed as a result of forming the U-shaped cross section in order to improve the rigidity of the frame member, and since the cable is wired in this dead space, the space around the frame member is reduced. Without being narrowed by the cable, it is possible to improve the degree of freedom of the mounting position of the components provided in the vicinity of the frame member.

  Furthermore, the cable routed in the concave groove is protected by being surrounded by a frame member on the three sides, and it is not rubbed by other parts and the coating is not broken. Can do.

  In addition, since the cable connected to the battery can be inserted into the recessed groove of the frame member from above and wired, a relatively thick and difficult-to-handle cable for feeding can be easily wired. For this reason, the efficiency of wiring work can be further improved.

1 is a side view of a scooter type motorcycle according to the present invention. It is a top view of a body frame. It is a side view of the front half part of an upper frame. It is a top view of the front half part of an upper frame. It is a side view of the rear half part of an upper frame. It is a top view of the rear half part of an upper frame. It is a side view of a lower frame. It is a top view of a lower frame. It is the IX-IX sectional view taken on the left down frame in FIG. FIG. 6 is a cross-sectional view taken along the line XX of a longitudinally extending portion on the left side of the vehicle body in FIG. 5. FIG. 6 is a cross-sectional view taken along the line XI-XI of a longitudinally extending portion on the left side of the vehicle body in FIG. It is a perspective view of a body frame. It is sectional drawing which shows the other example of a frame member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Scooter, 4 Body frame, 23 Upper frame, 26 Rear half part, 31, 32 Front-back direction extension part, 35 3rd cross member (battery storage box), 42 Battery, 47, 52, 84 Groove, 55 Cable, 81 Frame member.

Claims (4)

In a motorcycle including a frame disposed below a seat,
The frame includes a pair of left and right front-rear direction extending portions extending in the front-rear direction of the motorcycle body through the lower part of the seat,
Each of the longitudinally extending portions is formed in a U-shaped cross section that opens downward by a vertical wall outside the vehicle body of the motorcycle, a vertical wall inside the vehicle body, and an upper wall connecting both the walls. And
On the inner wall portion of the vehicle body, a further wall portion extending in the front-rear direction of the motorcycle body is erected inward in the vehicle width direction of the motorcycle,
The further wall portion is erected at a position spaced downward from the upper wall;
The further wall portion is erected independently from each other in the longitudinally extending portion,
The pair of left and right front-rear extending portions are connected to each other at two locations separated in the front-rear direction of the motorcycle body,
The further wall portion extends between the two places where the pair of left and right front-rear extending portions are connected to each other,
The frame is molded by a die casting method using a mold that is divided in the vertical direction.
Motorcycle characterized by that. The motorcycle according to claim 1,
In each of the longitudinally extending portions, the height of the vertical wall inside the vehicle body is greater than the width of the upper wall.
Motorcycle characterized by that. The motorcycle according to claim 1 or 2,
The further wall is formed wider than its thickness.
Motorcycle characterized by that. The motorcycle according to any one of claims 1 to 3,
The further wall includes a portion having a constant width,
Motorcycle characterized by that.

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