JP2009214679A - Structure of mounting rectifier of motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of mounting a rectifier of a motorcycle capable of effectively and efficiently cooling the rectifier with a relatively simple configuration. <P>SOLUTION: An engine unit 13 is mounted in the center of a vehicle between a front wheel 11 and a rear wheel 12. The structure of mounting the rectifier mounts the rectifier 47. The rectifier 47 is arranged at a lower position of the vehicle between the engine unit 13 and the rear wheel 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rectifier mounting structure that can be suitably applied particularly to a motorcycle.

  The motorcycle includes a rectifier / converter unit (hereinafter simply referred to as a rectifier) including a rectifier that converts an alternating voltage generated by a generator into a direct current and a voltage adjustment circuit that adjusts the generated voltage to a constant voltage. Since this type of rectifier generates heat during its circuit operation, a cooling fin is attached to the storage case to radiate heat to the outside.

  When installing a rectifier in a motorcycle, the rectifier itself generates heat, so there are no escape holes (or exhaust heat passages) and the ambient temperature rises, or other heat sources are installed nearby. Must be avoided as much as possible. For example, there is an example in which a normal large on-road vehicle is stored in a rear cowl.

Japanese Patent Laid-Open No. 60-092179

  Conventionally, if the rectifier is installed in a place where the ambient temperature rises as described above or where there is another heat source nearby, the allowable heat-resistant temperature of the rectifier will be exceeded as it is, and in such cases, a high cooling effect Therefore, the cooling fins must be enlarged. In addition, when installed on a rear cowl or the like, there is a problem that the rear part of the vehicle becomes large or bulges.

  On the other hand, as in the vehicle described in Patent Document 1, a circuit component in a metal case is molded, and the case is attached to a body frame or the like having good thermal conductivity in a surface contact state. According to this example, the cooling fin can be omitted, but the man-hour, cost, etc. for the resin mold or the like must be increased.

  In view of such circumstances, an object of the present invention is to provide a rectifier mounting structure for a motorcycle capable of effectively and efficiently cooling a rectifier with a relatively simple configuration.

  A rectifier mounting structure for a motorcycle according to the present invention is a rectifier mounting structure for mounting a rectifier in a motorcycle in which an engine unit is mounted in a vehicle central portion between a front wheel and a rear wheel, and the engine unit and The rectifier is arranged between the rear wheel and a lower position of the vehicle.

  Further, in the rectifier mounting structure for a motorcycle of the present invention, the rectifier has a cooling fin, and the surface side on which the cooling fin is formed is arranged so as to be directed to the grounding point of the rear wheel. To do.

  In the rectifier mounting structure for a motorcycle according to the present invention, as the vehicle lower position, the rear wheel is rotatably supported at the rear end, while the front end extends vertically on the rear side of the engine unit. It is a position below the front part of the rear swing arm that is rotatably supported by a swing arm pivot part provided at the rear part of the main frame, and extends vertically in the center in the vehicle width direction of the front part of the rear swing arm. The rectifier is arranged behind a rear cushion unit constituting the rear wheel suspension.

  The rectifier mounting structure for a motorcycle according to the present invention further includes an under cowling that covers at least a lower portion of the engine case of the engine unit, and the under cowling extends a rear extension that covers the rear cushion unit from below. And an under cowling brace extending from a rear lower portion of the main frame and supporting a rear extension of the under cowling, and the rectifier is attached to the under cowling brace.

According to the present invention, the rectifier can be disposed at the lower position of the vehicle between the engine unit and the rear wheel, and thereby the rectifier can be efficiently cooled by the traveling wind.
Further, by arranging the cooling fins of the rectifier so as to face the grounding point of the rear wheel, it is possible to prevent mud or the like from entering between the cooling fins.

A preferred embodiment of a rectifier mounting structure for a motorcycle according to the present invention will be described below with reference to the drawings.
First, the overall configuration of the motorcycle 10 according to the present embodiment will be described. In FIG. 1, front wheels 11 and rear wheels 12 are arranged in the front and rear of the vehicle, and an engine unit 13 is mounted on the vehicle body frame at the center of the vehicle between the front wheels 11 and the rear wheels 12. In the figure, the front and rear of the vehicle are represented by arrows Fr and Rr, respectively.

  Two front forks 14 on the left and right are supported on a front portion of a vehicle body frame made of steel or aluminum alloy so as to be turnable to the left and right by a steering head pipe described later. A handlebar 15 is fixed to the upper end of the front fork 14, and the front wheel 11 is rotatably supported at the lower end thereof. A front fender 16 is fixed so as to cover the upper part of the front wheel 11, and a brake disc 17 that rotates integrally with the front wheel 11 is provided.

  A rear swing arm 18 is swingably provided at a rear portion of the vehicle body frame, and a rear cushion unit described later is mounted between the vehicle body frame and the swing arm 18. A rear wheel 12 is rotatably supported at the rear end of the rear swing arm 18, and the rear wheel 12 is rotationally driven via a driven sprocket 20 around which a chain 19 is wound. The vicinity of the front upper portion of the rear wheel 12 is covered with the inner fender 21 and a part of the rear swing arm 18.

  The engine unit 13 mounted on the vehicle body frame is supplied with an air-fuel mixture from an intake pipe via an air cleaner, and exhaust gas after combustion is exhausted through an exhaust pipe 22. The exhaust pipe 22 is coupled to the front side of the engine unit 13. Here, the engine unit 13 may be a multi-cylinder engine, and the exhaust pipe 22 extending from each cylinder is integrated under the engine case 23 of the engine unit 13, and the exhaust gas is then discharged through the muffler. It is like that. A fuel tank 24 is mounted above the engine unit 13, and a seat 25 and a seat cowl 26 are connected to the rear of the fuel tank 24.

Further, in FIG. 1, 27 is a headlamp, 28 is a meter unit including a speedometer, tachometer, or various indicator lamps, and 29 is a rearview mirror supported by the handlebar 15 via a stay 30.
In addition, a radiator 31 is disposed so as to avoid interference with the front fender 16 (and the front wheel 11), and a cooling water hose 32 is disposed from the radiator 31 without interfering with the exhaust pipe 22, and is disposed in the engine unit 13. Communicate.

  A cowling 33 is attached from the vicinity of the front side of the fuel tank 24 to the outside of the cylinder head of the engine unit 13, and the lower part of the engine case 23 of the engine unit 13 is covered with an under cowling 34.

  Here, FIGS. 2 and 3 mainly show the frame structure of the motorcycle 10. In the figure, a main frame 35 constituting a vehicle body frame includes a frame head portion 36 and a frame body portion 37. The frame head portion 36 has a steering head pipe 38 for supporting the front fork 14, and this steering head pipe. Bifurcates from 38 in the left-right vehicle width direction. The frame body portion 37 extends rearward and obliquely downward from each of the branched frame head portions 36, and is bent or curved so as to extend substantially vertically in the rear portion. A pivot portion 39 that is a shaft support portion of the rear swing arm 18 is provided on the rear portion 37a of the frame body portion 37, and further includes a seat including tank rails 40A and 40B extending obliquely upward and rearward from the vicinity of the rear portion of the frame body portion 37. The frame 40 is connected.

  Next, referring also to FIGS. 4 to 6, the vicinity of the lower end of the rear portion 37 a of the pair of left and right frame body portions 37 is connected to each other in the left-right direction by a bridge member 41 (see FIG. 5 and the like). A pair of support brackets 42 projecting substantially downward from the bridge member 41 are provided, and the support brackets 42 rotate one end portion 43a of a rear suspension link bar 43 (hereinafter simply referred to as “link bar”) by pin coupling. Support as possible. The other end 43b of the link bar 43 is pin-coupled to the rear cushion unit 44 that constitutes the rear wheel suspension.

  The rear cushion unit 44 is arranged in a substantially vertical direction at a substantially central portion in the left-right direction of the vehicle, and an upper end portion 44a thereof is supported by a pin connection at an appropriate position on the frame body portion 37 side. The lower end portion 44 b of the rear cushion unit 44 is pin-coupled to the other end portion 43 b of the link bar 43.

  As shown in FIG. 5, the substantially central portion of the link bar 43 is formed in a boss shape so as to be wide in the left-right direction (boss portion 43c). A pair of rear suspension link rods 45 (hereinafter simply referred to as “link rods”) are pin-coupled to the left and right ends of the boss portion 43c, and the rear swing arm 18 and the link bar 43 (accordingly, the rear cushion) are connected via the link rod 45. Unit 44). That is, a pair of support brackets 46 projecting substantially downward from the rear swing arm 18 are provided, and the support brackets 46 rotatably support one end portions 45a of the link rods 45 by pin coupling. Further, each other end 45b of the link rod 45 is pin-coupled to the boss 43c.

  In the above case, the inner width (in the left-right direction) between the link rods 45 is set to be larger than the maximum outer diameter of the rear cushion unit 44. When the rear cushion unit 44 operates and moves up and down, the two do not interfere even if they enter the inner width of the link rod 45. This ensures proper and smooth operation of the rear wheel suspension.

  Here, as described above, the vicinity of the front upper portion of the rear wheel 12 is covered with the inner fender 21 and a part of the rear swing arm 18. In this case, in the rear swing arm 18, as shown in FIGS. 4 and 2 (shaded area portion), the fender surface is disposed along the outer periphery of the rear wheel 12 at a predetermined interval and has a fender function. 21A is attached. The fender surface 21 </ b> A is formed and arranged so as to be smoothly continuous with the inner surface of the inner fender 21, and both realize a fender function with respect to the rear wheel 12.

  The under cowling 34 that covers the lower portion of the engine case 23 has a rear extension 34 a that extends rearward as shown in FIG. 1 or 2. A part of the rear extension 34 a is notched, but extends to a lower region of the link bar 43.

  In the present invention, as shown in FIG. 2 and the like, a rectifier 47 is disposed between the engine unit 13 and the rear wheel 12 at a vehicle lower position. The rectifier 47 typically has a plurality of cooling fins 47a protruding from a substantially rectangular or thin box rectifier body. In particular, the surface side on which the cooling fins 47a are formed is arranged so as to face the grounding point of the rear wheel 12 (see FIGS. 2 and 6, arrow B).

  A typical arrangement position of the rectifier 47 is a rear swing whose front end is rotatably supported by a pivot portion 39 provided on a rear portion 37a of a frame body portion 37 extending vertically on the rear side of the engine unit 13. It is a position below the front part of the arm 18 and is behind the rear cushion unit 44 that extends vertically in the vehicle width direction central part of the front part of the rear swing arm 18 and constitutes a rear wheel suspension.

  In the specific mounting structure of the rectifier 47, in particular, referring to FIG. 6, an under cowling brace 48 for supporting a rear extension 34a that covers the rear cushion unit 44 from below is provided, and the under cowling brace 48 is provided with a rectifier. 47 is attached. The under cowling brace 48 is formed of, for example, a steel pipe material. In this case, the above-described bridge member 41 is provided with a brace mounting portion 49 (see FIG. 5), and a mounting bracket 50 (substantially in the vertical direction) in which an under cowling brace 48 is fixed to the brace mounting portion 49 is fastened with a bolt 51. Fix it.

  As shown in FIG. 6, the under cowling brace 48 extends rearward from the mounting bracket 50 (while being appropriately lowered), and in this example, is bent in a key shape near the lower portion of the support bracket 46 (in the vehicle width direction, ie, FIG. 6). In FIG. The rectifier 47 (main body) is attached and supported by the bent portion via the attachment bracket 52. As shown in FIG. 5, the under cowling brace 48 is disposed so as to extend further along the right side of the right link rod 45 in a plan view and to wrap around the left link rod 45 side at the bent portion. By arranging the under cowling brace 48 in such an offset manner, it does not interfere with a movable member such as the link rod 45.

  The under cowling brace 48 has a support portion 48a extending further downward (obliquely downward) from the bent portion, and the rear extension portion 34a of the under cowling 34 is connected to the bolt 53 (FIG. 4) at the tip of the support portion 48a. (Refer to the above). A cover 54 is provided around the rectifier 47 to protect it.

  In the above configuration, first, the rectifier 47 is disposed between the engine unit 13 and the rear wheel 12 and at a lower position of the vehicle. This position is covered forward by the engine case 23 of the engine unit 13 so that the muddy water, the jumping stones, etc. that the front wheel 11 bounces up do not fly directly. Moreover, since the rear is open to the space outside the vehicle, the rectifier 47 can be efficiently cooled by the traveling wind.

  Next, the surface side of the rectifier 47 on which the cooling fins 47 a are formed is arranged so as to face the grounding point of the rear wheel 12. Most of the mud and muddy water adhering to the rear wheel 12 is scattered backward by the centrifugal force of the rear wheel 12. What flies to the inner surface of the inner fender 21 flows down to the front of the rear wheel 12 along the inner surface of the fender. In this case, even if it flies to the rectifier 47, by arranging the cooling fin 47a so as to be directed to the grounding point of the rear wheel 12 as described above, mud or the like can enter the cooling fin 47a. Can be prevented. Since mud, bouncing stones and the like are not clogged between the cooling fins 47a, it is possible to always ensure proper and good cooling performance.

  Further, the lower end portion of the fender surface 21A formed on the rear swing arm 18 so as to be connected to the inner fender 21 is located behind the rectifier 47 as shown in FIG. Even if muddy water falls from the fender surface 21A, it is behind the rectifier 47 as described above, and the muddy water scatters to the rectifier 47 side in consideration of traveling wind and the like.

  Further, the rectifier 47 can be efficiently attached while ensuring the original function of the under cowling brace 48. That is, while having a very simple configuration, it has advantages such as realizing an excellent cooling effect.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
For example, the example in which the under cowling brace 48 is fixed to the brace attaching portion 49 has been described. However, it is possible to attach the under cowling brace 48 to another part of the bridge member 41 and further to another member as long as rigidity, space, and the like are allowed. .

1 is a side view showing an example of the overall configuration of a motorcycle according to an embodiment of the present invention. 1 is a side view showing an example of a body frame structure of a motorcycle according to an embodiment of the present invention. 1 is a rear perspective view showing an example of a body frame structure of a motorcycle according to an embodiment of the present invention. FIG. 3 is a bottom view of the motorcycle according to the embodiment of the present invention as seen in the direction of arrow A in FIG. 2. It is an enlarged bottom view which shows the principal part structure of the rectifier attachment structure of this invention. It is a side view which shows the principal part structure of the rectifier attachment structure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Motorcycle 11 Front wheel 12 Rear wheel 13 Engine unit 14 Front fork 18 Swing arm 21 Inner fender 22 Exhaust pipe 23 Engine case 24 Fuel tank 33 Cowling 34 Under cowling 35 Main frame 36 Frame head part 37 Frame body part 39 Pivot part 40 Seat Frame 41 Bridge member 42 Support bracket 43 Rear suspension link bar 44 Rear cushion unit 45 Rear suspension link rod 46 Support bracket 47 Rectifier 48 Under cowling brace 49 Brace mounting part 50 Mounting bracket 52 Mounting bracket

Claims (4)

In a motorcycle equipped with an engine unit in the center of the vehicle between the front and rear wheels, a rectifier mounting structure for mounting a rectifier,
A rectifier mounting structure for a motorcycle, wherein the rectifier is disposed between the engine unit and the rear wheel at a lower position of the vehicle.   The rectifier mounting structure for a motorcycle according to claim 1, wherein the rectifier has cooling fins, and the surface side on which the cooling fins are formed is arranged so as to face a grounding point of the rear wheel. .   As the vehicle lower position, the rear wheel is pivotally supported at the rear end, while the front end is pivotable on a swing arm pivot portion provided at the rear of the main frame extending vertically on the rear side of the engine unit. At a position below the front part of the rear swing arm supported on the rear part of the rear cushion unit that extends vertically in the vehicle width direction center of the front part of the rear swing arm and constitutes a rear wheel suspension. The rectifier mounting structure for a motorcycle according to claim 1, wherein a rectifier is arranged.   An under cowling that covers at least a lower portion of the engine case of the engine unit is provided. The under cowling extends a rear extending portion that covers the rear cushion unit from below, and extends from a rear lower portion of the main frame to extend the under cowling. The rectifier attachment structure for a motorcycle according to claim 3, further comprising an under cowling brace that supports a rear extension of the cowling, and the rectifier is attached to the under cowling brace.

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