JP4556687B2 - Scooter type motorcycle guard structure - Google Patents

Description

  The present invention relates to a guard structure for a scooter type motorcycle having a U-shaped foot passage space and a swing unit type power unit.

Conventionally, a motorcycle is generally provided with a guard member for protecting the vehicle body and the engine when the vehicle falls. For example, in the motorcycle disclosed in Patent Document 1, a guard member made of metal pipe is attached to a vehicle body frame. In the motorcycle disclosed in Patent Document 2, a muffler cover as a guard member is attached to the vehicle body frame.
Japanese Utility Model Publication No. 52-61841 Japanese Utility Model Publication No. 56-69587

  However, particularly in a scooter type motorcycle, since the vehicle body is usually covered with a resin cover, it is not easy to attach the guard member to the vehicle body frame. Further, in a swing unit type scooter type motorcycle in which a power unit including an engine swings up and down together with a rear wheel, a vehicle body frame passes above the engine at the rear of the vehicle body, so that mainly the vehicle body rear portion is protected. It is necessary to attach a large guard member that connects the vehicle body frame above the engine and the lower part of the engine, which not only makes the guard member heavy, but may interfere with the pillion rider in a two-seater motorcycle .

  Also, if the guard member is directly attached to the engine body, the impact received by the guard member when the vehicle falls is directly transmitted to the engine body, which may damage the engine body.

  By the way, the scooter type motorcycle generally has a low engine arrangement position and a small wheel outer diameter. Therefore, in order to appropriately protect the vehicle body and the engine, the arrangement of the guard member and the setting of the shape are important. On the other hand, the scooter type motorcycle has a low center of gravity as a single vehicle, but the absolute weight of the vehicle is light, so that when the passenger gets on, the center of gravity including the passenger becomes high. For this reason, the vehicle may fall down, and it is highly important to consider the configuration of the guard member in consideration of these.

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to appropriately provide a vehicle body and an engine without applying external force directly to the engine when the vehicle falls while the guard member is small and light. An object is to provide a guard structure for a scooter type motorcycle that can be protected.

In order to achieve the above object, a guard structure for a scooter type motorcycle according to claim 1 of the present invention has a U-shaped foot passage space (S1) in side view and swings together with a rear wheel and an exhaust muffler (31). A scooter type motorcycle guard structure having a power unit (50) for attaching the exhaust muffler attached to the rear part of the crankcase (21) of the power unit on the left and right sides of the power unit to the power unit. wherein the power unit and the bracket (30) separate, includes a cover member provided on said one of left and right sides of the power unit, the extending portion which extends outwardly in the vehicle width direction (42), said cover member the exhaust muffler is disposed so as to face the space formed between the guard portion of the vehicle body protection that is supported by the bracket (40) and having a, in a front view, when brought into contact with a virtual straight line (L1) from the outside to the lower portion of the rear wheel and the extending portion of the guard member, said power unit, said virtual It is located in the vehicle center side in the front view with respect to this straight line.
In order to achieve the above object, a guard structure for a scooter type motorcycle according to claim 2 of the present invention has a U-shaped foot passage space in a side view and a power unit that swings with a rear wheel and an exhaust muffler. A guard structure for a two-wheeled vehicle, having a bracket separate from the power unit and extending to the outside in the vehicle width direction, attached to the rear part of the crankcase of the power unit on one side of the power unit. And a guard member for protecting the vehicle body supported by the bracket, and in a front view, a virtual straight line is brought into contact with the extension portion of the guard member and the lower portion of the rear wheel from the outside. When the power unit is located on the vehicle center side in a front view with respect to the virtual straight line, at the rear of the power unit closer to the left and right side Oil inlet is provided, wherein the guard member is formed in a frame shape, the extending portion such that the space is produced for the oiling work around the oil inlet is characterized by being bent.

  In addition, the code | symbol in the said parenthesis is an illustration.

  ADVANTAGE OF THE INVENTION According to this invention, a vehicle body and an engine can be protected appropriately, without giving external force directly to an engine at the time of vehicle fall, although a guard member is small and lightweight.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a right side view of a scooter type motorcycle to which a guard structure according to an embodiment of the present invention is applied. FIG. 2 is a right side view of the main part of the scooter type motorcycle. FIG. 3 is a plan view of the main part of the scooter type motorcycle.

  As shown in FIG. 1, the scooter type motorcycle (hereinafter referred to as “motorcycle”) 1 includes a down tube 11 and a pair of left and right rear frames 12 extending rearward and upward from a rear end portion of the down tube 11. Have. A head pipe 48 is provided at the front end of the down tube 11, and a handle 13 and a front fork 49 are provided above and below the head pipe 48, respectively. A front wheel 52 is rotatably supported on the front fork 49 via an axle 51. Then, the front wheel 52 is steered to the left and right by the handle 13. The motorcycle 1 is almost entirely covered with a synthetic resin body cover 15 so that the appearance of the motorcycle 1 is adjusted.

  A seating seat 16 is provided above the rear frame 12. The motorcycle 1 is a two-seater and the seating seat 16 includes a front seat 16a and a pillion seat 16b. The motorcycle 1 is provided with a step floor 14 on which the feet of the front occupant are placed, and an upper portion of the step floor 14 is a U-shaped foot passage space S1 in side view. In addition, a pair of left and right pillion footrests 56 are provided on the rear side of the step floor 14 for placing the pillion occupant's feet.

  A swing type power unit (hereinafter simply referred to as “power unit”) 50 is provided below the seating seat 16. The power unit 50 integrally includes the engine 20 and the swing case 10 (see FIGS. 2 and 3). A rear wheel 54 is pivotally supported by an axle 53 at the rear portion of the swing case 10. An exhaust muffler main body 31 is fixed to the engine 20 as will be described later.

  A suspension bracket 17 is fixed to the rear end portion of the down tube 11, and a pivot 18 is installed on the rear portion of the suspension bracket 17. A support arm 19 provided at the front lower portion of the power unit 50 is pivotally attached to the pivot 18. On the other hand, the swing case 10 is elastically supported by the rear frame 12 via a rear shock absorber (not shown). As a result, the power unit 50 is swingable up and down around the pivot 18 together with the rear wheel 54 and the exhaust muffler body 31 via the support arm 19 (see also FIG. 2).

  As shown in FIG. 3, the engine 20 has a crankcase 21 including a left crankcase 21L and a right crankcase 21R, and a cylinder head cover 22 is mounted on the front portion of a cylinder head 47 provided at the front portion. Yes. The swing case 10 is connected to the left side of the left crankcase 21L. Housed within the swing case 10 is a power transmission device (not shown) that transmits the power of the engine 20 to the rear wheel 54. A kick shaft 26 protrudes from the left side of the swing case 10.

  A fuel supply device 55 having a throttle body 24 is provided at the left front portion of the engine 20, and a starter motor 23 is provided substantially at the center in the width direction of the engine 20. A fan cowl 29 for forced air cooling of the engine 20 is provided on the right side of the engine 20.

  As shown in FIG. 2, an exhaust pipe 25 is connected to the lower part of the cylinder head 47, and an exhaust muffler main body 31 is connected to the downstream side of the exhaust pipe 25, and these constitute an engine exhaust system. A muffler cover 32 is attached to the exhaust muffler main body 31 so as to cover the upper right portion thereof. As will be described later, the exhaust muffler body 31 is fixed to the engine 20 via a metal muffler mounting bracket 30 that is separate from the engine 20.

  FIG. 4 is a left side view of the exhaust muffler body 31 and the muffler mounting bracket 30. The muffler mounting bracket 30 has a substantially triangular shape when viewed from the side, and is integrally formed with the exhaust muffler main body 31 via its connecting portions 45 and 46. Further, attachment portions 30 a and 30 b that are holes for attachment to the engine 20 are provided at the top and bottom of the front portion of the muffler attachment bracket 30. A guard member 40 (described later) for protecting the vehicle body and the power unit 50 is supported and fixed to the muffler mounting bracket 30.

  FIG. 5 is a front view of the engine exhaust system and the guard member 40 of the motorcycle 1, and FIG. 6 is an enlarged view thereof.

  As shown in FIG. 6, mounting bosses 33 and 34 corresponding to the mounting portions 30a and 30b of the muffler mounting bracket 30 are integrally formed at the rear portion of the right crankcase 21R. The muffler mounting bracket 30 is screwed to the mounting bosses 33 and 34 with bolts 35 and 36 at the mounting portions 30a and 30b. The exhaust muffler main body 31 is fixed to the engine 20 by attaching the muffler mounting bracket 30 to the right crankcase 21R in this way and attaching the tip of the exhaust muffler main body 31 to the exhaust pipe 25. The In this state, the rear end of the exhaust muffler main body 31 becomes a free end held in a flipped state, and the exhaust muffler main body 31 swings up and down together with the engine 20. The exhaust muffler body 31 has a particularly enhanced rigidity in the swing direction so that it can withstand a swing.

  As shown in FIGS. 2 and 3, the oil filler portion 27 is provided on the right side portion of the engine 20. The oil filler portion 27 is located on the rear side and the outer side of the right crankcase 21R in the space S2 (see FIG. 3) generated between the fan cowl 29 and the exhaust muffler main body 31, and is located rearwardly upward and outward in the vehicle width direction ( It extends to the right) and has an oil filler plug 28 at its tip. As shown in FIGS. 3 and 6, nut portions 37 and 38 are integrally formed on the outside (right side surface) of the muffler mounting bracket 30.

  As shown in FIGS. 2, 3, 5, and 6, the guard member 40 is formed of a metal plate-like member 41 and an extending portion 42 made of a solid thick wire. It consists of The plate-like member 41 is substantially parallel to the front and rear and the vertical direction, and is screwed and fixed to the nut portions 37 and 38 of the muffler mounting bracket 30 with bolts 43 and 44 (see FIG. 6). The extending portion 42 extends rightward from the plate-like member 41 and has a U-shape when viewed from the front, and the plate-like member 41 and the extending portion 42 form a closed loop having a square shape when viewed from the front. (See FIG. 6).

  As shown in FIG. 6, the extending part 42 of the guard member 40 has a first straight part 42a and a second straight part 42b. In a posture in which the motorcycle 1 travels straight, when the imaginary straight line L1 is brought into contact with the lower portion 54a of the rear wheel 54 and the extending portion 42 of the guard member 40 from the right in the front view, the first straight portion 42a. Is formed so as to abut on the virtual straight line L1 in parallel. Therefore, when the motorcycle 1 falls to the right, the first straight portion 42a comes into contact with the ground 39 in a line contact state. And the power unit 50 is located in the vehicle center side in front view with respect to the virtual straight line L1. Therefore, no external force is directly applied to the power unit 50 when the vehicle falls. The second straight portion 42b is formed substantially vertically when viewed from the front.

  As shown in FIG. 3, the guard member 40 is disposed so as to face the space S <b> 2, and is disposed adjacent to the oil filler portion 27 and behind the oil filler portion 27. The guard member 40 is formed in a closed loop, that is, a frame shape as described above. In addition, as shown in FIG. 2, the extending portion 42 is bent in a “<” shape at the first straight portion 42 a and the second straight portion 42 b so as to avoid the oil filler portion 27 in a side view. . As a result, in the narrow space S2, a space for oiling work including the operation of attaching and detaching the oil filler plug 28 is secured around the oil filler part 27, and it is easy to perform oiling work and the like.

  Furthermore, as shown in FIG. 2, the straight line that passes through the two root parts of the extension part 42 connected to the plate-like member 41 is more than the inclination of the straight line L2 that passes through the axis of the oil filler part 27 in a side view. The backward inclination of L3 is larger. Therefore, the space for oiling work is expanded upward. This also facilitates lubrication work and the like.

  As shown in FIG. 1, the entire guard member 40, including the case where the power unit 50 swings, is always within the outer diameter of the rear wheel 54 and positioned in front of the axle 53 in a side view. Here, in order to compare the guard member corresponding to the guard member 40 with a configuration in which the guard member 40 is supported by the rear frame 12 or the like, the guard member is grounded when the motorcycle 1 is laid down to the right by a predetermined angle. Think about the case. In this case, as compared with the configuration in which the guard member is supported by the rear frame 12 and the like, the guard member 40 is set as described above, so that the amount of protrusion to the right side can be reduced and the size can be reduced. . Further, since the guard member 40 is located below the pillion seat 16b and is disposed in the space S2, the footing performance of the pillion occupant with respect to the pillion footrest 56 is not impaired.

  As shown in FIG. 1, the height of the guard member 40 from the ground 39 (see FIG. 5) is equal to or higher than the heights of the axles 51 and 53 of the front wheel 52 and the rear wheel 54. By the way, in this motorcycle 1, there are a step floor 14, a pillion footrest 56, a crankshaft (not shown) of the engine 20, and the like as elements having the same height as the axles 51 and 53. Further, as elements located slightly below these, there are the rear half of the down tube 11, the suspension bracket 17, the exhaust pipe 25, a battery (not shown), and the like. That is, the motorcycle 1 is a vehicle having a very low center of gravity. By setting the height of the guard member 40 in the above-described relationship with respect to the other components, the vehicle body and the power unit 50 can be reliably secured in the motorcycle 1 having a small wheel diameter and a low position of the power unit 50 itself. Can be protected.

  FIG. 7 is a schematic diagram showing a ground contact state when the motorcycle 1 falls. The figure shows that the motorcycle 1 falls slightly diagonally to the right (falling angle such that the virtual straight line L1 and the ground 29 shown in FIG. 6 are parallel), and the front wheels 52, rear wheels 54, and guard members 40 It is assumed that the one straight line portion 42a is in contact with the ground 39, and corresponds to a view of the ground 39 projected from above. A virtual triangle T1 is formed that connects the ground points P1, P2, and P3 of the front wheel 52, the rear wheel 54, and the first straight portion 42a.

  As shown in the figure, in a plan view when the vehicle falls, the center of gravity P4 and the upper end position P5 of the engine 20 are within the region on the normal line of the virtual triangle T1. Therefore, coupled with the fact that the power unit 50 is positioned on the vehicle center side in the front view with respect to the virtual straight line L1 (see FIG. 6), the power unit 50 to the engine 20 can be reliably protected when the vehicle falls.

  Further, the upper end positions P6 and P7 of the front wheel 52 and the rear wheel 54 are on the grounding points P1 and P2 side as viewed from the grounding point P3, and the center of gravity P4 is within the virtual triangle T1 as described above. As a result, it is difficult for the vehicle to fall down completely such that the second straight portion 42b of the guard member 40 is in contact with the ground, and in many cases, three-point support is mainly provided by the front wheels 52, the rear wheels 54, and the first straight portions 42a. It will be in a tilted state.

  Incidentally, the plate-like member 41 of the guard member 40 is located on the inner side (left side) of the right edge 15a of the vehicle body cover 15 (see FIG. 5), and the right end positions of the fan cowl 29, the exhaust muffler main body 31, and the muffler cover 32. (See FIG. 3).

  On the other hand, the tip of the extending portion 42 of the guard member 40 (the right end of the second straight portion 42b) is on the outer side (right side) of both the right edge 15a of the vehicle body cover 15 and the right end of the handle 13 during straight traveling. In addition to being positioned (see FIG. 5), the fan cowl 29, the exhaust muffler main body 31 and the muffler cover 32 are positioned outside the right end positions (see FIG. 3). Moreover, the distance D1 (see FIG. 5) from the vehicle center C1 in the vehicle width direction at the tip of the extending portion 42 is set to be equal to or greater than the radius of the front wheel 52 and the rear wheel 54 and equal to or less than the diameter. Yes. Thus, even if the motorcycle 1 is completely laid down on the right side, the tip of the extension portion 42, the right edge 15a of the vehicle body cover 15, the right handle 13 (and an unillustrated attached thereto) ), It is possible to prevent many parts of the vehicle body from being grounded and to protect the vehicle body.

  According to the present embodiment, the power unit 50 is located on the vehicle center side in the front view with respect to the virtual straight line L1 in contact with the lower portion 54a of the rear wheel 54 and the extending portion 42 of the guard member 40 in the front view. Therefore, the power unit 50 or the engine 20 can be reliably protected when the vehicle falls. Moreover, since the guard member 40 has an extending portion 42 that extends outward in the vehicle width direction and is supported by the muffler mounting bracket 30 that is separate from the engine 20, it is a large-sized connecting the vehicle body frame and the engine lower portion. Compared to the configuration in which the guard member is attached, the guard member 40 is smaller and lighter, and does not interfere with the pillion rider in the two-seater motorcycle 1. In addition, since the impact and external force received by the guard member 40 when the vehicle falls are indirectly transmitted to the engine 20, there is less risk of damage to the engine 20 compared to a configuration in which the guard member is directly attached to the engine body. Therefore, while the guard member 40 is small and light, the vehicle body and the engine 20 can be appropriately protected without directly giving an impact or external force to the engine 20 when the vehicle falls.

  Further, since the guard member 40 is provided with the first straight portion 42a that comes in contact with the ground 39 in a line contact state when the motorcycle 1 falls to the right, the guard member 40 is less likely to get caught during the contact, and the first Since the surface pressure at the time of grounding of the straight part 42a is low, the durability against repeated grounding due to falling is high.

  Further, since the guard member 40 is always located in front of the axle 53 within the outer diameter of the rear wheel 54 in a side view, and the height from the ground 39 is equal to or higher than the height of the axle 53, Even in a low-gravity center vehicle having a small wheel diameter and a low mounting position of the power unit 50 as in the motorcycle 1, the vehicle body and the engine 20 can be reliably protected, and the guard member is supported on the vehicle body frame or the like. Compared to the case, the protrusion amount of the guard member in the vehicle width direction can be suppressed.

  Furthermore, since the guard member 40 has a frame shape, it has high rigidity and exhibits sufficient protection capability without increasing the cross-sectional area of the extending portion 42 and the plate-like member 41, so that it can be small and light. Also, due to the rigidity of each of the extending portion 42 and the plate-like member 41, the load applied to each of the bolts 43 and 44 is dispersed and almost equalized regardless of the direction of the received external force, so that durability is improved. high.

  Further, according to the present embodiment, the guard member 40 is disposed so as to face the space S2 generated between the fan cowl 29 and the exhaust muffler main body 31. Therefore, the guard member 40 is effectively used by using the dead space. It can be made compact and does not interfere with the vehicle body cover 15.

  Furthermore, the guard member 40 is formed in a frame shape, and since the extending part 42 is bent so that a space for oiling work is generated around the oil filler part 27, it does not hinder oiling work, In addition, there is little risk of the body touching the exhaust muffler main body 31 during the lubrication operation, which is safe.

  Further, since the guard member 40 has a frame shape, the extended portion 42 of the guard member 40 is used as a handle of the exhaust muffler body 31 when the exhaust muffler body 31 to which the guard member 40 is fixed is detached from the power unit 50. can do.

  Moreover, since the guard member 40 is fixed to the muffler mounting bracket 30 with bolts 43 and 44, when the guard member 40 is damaged, only the guard member 40 can be easily replaced.

  When the muffler mounting bracket 30 is supported on the right crankcase 21R, for example, an elastic member or a buffer member is interposed between the muffler mounting bracket 30 and the mounting bosses 33, 34 of the right crankcase 21R. Also good. Thereby, it is further reduced that the impact received by the guard member 40 is transmitted to the engine 20.

  In the present embodiment, the guard member 40 is supported by the muffler mounting bracket 30. However, the guard member 40 is not limited to this, and may be a bracket that is separate from the engine 20 and can be fixed to the engine 20. You may support to another bracket. Alternatively, the guard member 40 may be fixed to the engine 20 by interposing another second bracket in addition to the muffler mounting bracket 30.

  In addition, from the viewpoint of improving the beauty and durability of the guard member 40, it is preferable to perform plating on the surface. In addition, from the viewpoint of reducing the weight of the guard member 40, the extending portion 42 may be formed of a hollow member.

  In the motorcycle 1, a configuration that is bilaterally symmetrical to the present embodiment may be employed. In this case, the guard member 40 is disposed on the left side of the power unit 50.

1 is a right side view of a scooter type motorcycle to which a guard structure according to an embodiment of the present invention is applied. It is a right view of the principal part of the same scooter type motorcycle. It is a top view of the principal part of the same scooter type motorcycle. It is a left view of an exhaust muffler main body and a muffler mounting bracket. 1 is a front view of an engine exhaust system and a guard member of a motorcycle. It is the elements on larger scale of FIG. FIG. 3 is a schematic diagram showing a ground contact state when the motorcycle falls.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Motorcycle (scooter type motorcycle), 10 Swing case, 20 Engine, 21 Crank case, 27 Oil filler part (oil inlet), 29 Fan cowl (cover member), 30 Muffler mounting bracket (bracket), 31 Exhaust Muffler main body (exhaust muffler), 40 guard member, 42 extension part, 42a first straight part (grounding part), 50 power unit, 53 axle, 54 rear wheel, L1 virtual straight line, S1 foot through space, S2 space

Claims (4)

A scooter-type motorcycle guard structure having a U-shaped foot passage space in a side view and having a power unit that swings with a rear wheel and an exhaust muffler,
A bracket separate from the power unit for attaching the exhaust muffler to the power unit attached to the rear part of the crankcase of the power unit on the left and right sides of the power unit;
A cover member provided on the left and right sides of the power unit;
Having an extending portion extending outwardly in the vehicle width direction, wherein disposed so as to face the space formed between the cover member and the exhaust muffler, have a guard member for the vehicle body protection that is supported by the bracket And
In a front view, when a virtual straight line is brought into contact with the extension portion of the guard member and the lower portion of the rear wheel from the outside, the power unit is positioned on the vehicle center side in the front view with respect to the virtual straight line. A scooter type motorcycle guard structure characterized by: A scooter-type motorcycle guard structure having a U-shaped foot passage space in a side view and having a power unit that swings with a rear wheel and an exhaust muffler,
A bracket separate from the power unit, attached to the rear part of the crankcase of the power unit on the left and right sides of the power unit;
A vehicle body protecting guard member supported by the bracket, having an extending portion extending outward in the vehicle width direction ;
In a front view, when a virtual straight line is brought into contact with the extension portion of the guard member and the lower portion of the rear wheel from the outside, the power unit is positioned on the vehicle center side in the front view with respect to the virtual straight line. And
An oil injection port is provided at the rear of the power unit near the left and right sides, and the guard member is formed in a frame shape so that a space for oiling work is created around the oil injection port. Scooter type motorcycle guard structure characterized in that the part is bent . The guard structure for a scooter type motorcycle according to claim 1 or 2 , wherein a linear contact portion along the imaginary straight line is provided at the extended portion of the guard member. The guard member is always located in front of the rear wheel axle within the outer diameter of the rear wheel in a side view, and the height from the ground is equal to or greater than the height of the axle of the rear wheel. The guard structure for a scooter type motorcycle according to any one of claims 1 to 3 .

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