JP6311441B2 - Rectifier mounting structure for motorcycles - Google Patents

Description

  The present invention relates to a rectifier mounting structure for a motorcycle that efficiently cools a rectifier that also serves as a frame strength member.

  A motorcycle is provided with a rectifier / regulator unit (hereinafter referred to as a rectifier) having a rectifier that rectifies the AC output of a generator and a voltage adjustment circuit that adjusts the generated voltage to a constant voltage. Since this type of rectifier is a heat generating electrical component that generates heat during operation of its electronic circuit, it is installed in a place where the vehicle has good cooling conditions.

  In a conventional motorcycle, as described in Patent Document 1, a rectifier is disposed on the side of a crankcase, and a rectifier is mounted to cool the rectifier by introducing a running wind from a hole provided in a side surface of an under cowl. As described in the structure and Patent Document 2, a rectifier is installed at the lower part of the vehicle body between the engine unit and the rear wheel, and the cooling fin of the rectifier is directed to the grounding point of the rear wheel to cool it. A rectifier mounting structure is known in which fins prevent mud and the like from entering and efficiently cool the rectifier by running wind.

JP 2009-113654 A JP 2009-214679 A

  In the invention described in Patent Document 1, a first fixing member (rectifier mounting bracket) is elastically supported by a rubber member on a second fixing member (under cowl mounting bracket) attached to an oil pan of a crankcase, and a rectifier It is a rectifier attachment structure in which a rectifier is attached to a dedicated first fixing member. In this rectifier mounting structure, since a mounting bracket dedicated to the rectifier is required, the number of mounting parts is increased for mounting the rectifier. Therefore, the installation and assembly of the rectifier is complicated and difficult, but the rectifier itself is not a strength member of the vehicle body, so it does not contribute to the increase in the rigidity of the vehicle body, but can contribute to the improvement of the vehicle body strength. could not.

  In the invention described in Patent Document 2, the rectifier is attached to an under cowl brace. In addition, the rectifier and its attachment parts do not constitute a strength member of the vehicle body.

  In the rectifier mounting structure for a motorcycle described in Patent Documents 1 and 2, the rectifier is provided near the engine unit, and the rectifier itself is made of an aluminum casting, so that the mounting bracket is for securing strength. The thickness of the bracket must be increased. Also, because the cooling fins of the rectifier have a bulky fin shape, the layout of the rectifier is greatly restricted, and the mounting position cannot be selected freely, increasing the degree of freedom of rectifier installation. It was difficult to take. In addition, since the rectifier does not constitute a strength member of the vehicle body, the strength of the vehicle body cannot be improved even if the rectifier is provided, and the number of attachment parts increases. In the rectifier mounting structure, the processing and assembly man-hours increase and become complicated and difficult, while the weight cannot be reduced.

  The present invention has been made in consideration of the above-described circumstances, and the rectifier itself constitutes a strength member of the vehicle body, thereby reducing the number of parts and improving the flexibility in layout, thereby improving workability and assembly. It is an object to provide a rectifier mounting structure for a motorcycle that can be simplified and lightened.

  Another object of the present invention is to provide a rectifier mounting structure for a motorcycle in which a rectifier is installed as a frame strength member at an upper position of the rear frame, heat dissipation of the rectifier is improved, and cooling efficiency is improved. is there.

  In order to solve the above-described problem, the rectifier mounting structure for a motorcycle according to the present invention is provided with an engine unit suspended on a body frame between a front wheel and a rear wheel, and the body frame is provided with a seat. A rear frame is composed of left and right seat rails and reinforcing left and right side frames, and a rectifier is installed on the left and right side frames of the rear frame.

  In the present invention, since the rectifiers are installed on the left and right side frames of the rear frame, the rectifiers can be directly attached to the left and right side frames, and can be configured as a frame strength member of the vehicle body frame. Reinforcement members such as members and mounting brackets dedicated to rectifiers can be eliminated, the number of parts can be reduced, mounting flexibility in layout is improved, workability and assembly are simplified, and weight reduction is achieved. be able to. Further, since the rectifier is installed on the left and right side frames (upper positions) of the rear frame away from the engine, the heat dissipation of the rectifier is improved and the cooling efficiency can be improved.

The external view which shows the whole structure of a motorcycle, and was seen from the left side surface of the vehicle. The figure which shows the frame structure which looked up at the body frame single-piece | unit of the motorcycle from the lower left side. The figure which looked up the vehicle body rear side of the motorcycle from the lower left side. The longitudinal cross-sectional view which looked at the vehicle body rear side of the motorcycle from the left side. The figure which shows the rectifier attachment structure of the vehicle body rear side of a motorcycle. The bottom view (bottom view) of the frame structure which shows the vehicle body frame simple substance of a motorcycle. A bottom view of the rectifier with a frame structure showing a single body frame of a motorcycle (bottom view). Sectional drawing in alignment with the VIII-VIII line of FIG. 7 which shows 1st Embodiment of the rectifier attachment structure of a motorcycle. The perspective view which looked up the rectifier shown by FIG. 8 from the vehicle body front lower side diagonally upwards back. The bottom view (bottom view) of the rectifier shown in FIG. 8 from the vehicle body lower side. The side view which follows the XI-XI line of FIG. Sectional drawing which shows 2nd Embodiment of the rectifier attachment structure of a motorcycle. The perspective view which looks down at the rectifier shown by FIG. 12 from the vehicle body rear side. The side view which follows the XIV-XIV line | wire of FIG.

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

[First Embodiment]
FIG. 1 is an external view of the entire configuration of a motorcycle as viewed from the left side. In the figure, the front and rear sides of the vehicle are indicated by arrows Fw and Rw, respectively. In the motorcycle 10, a front wheel 11 and a rear wheel 12 are arranged on the front and rear of the vehicle. An engine unit 14 suspended from a body frame 13 is provided between the front wheels 11 and the rear wheels 12. A fuel tank 15 is installed above the engine unit 14, and a seat 16 is provided adjacent to the rear of the fuel tank 15.

  The body frame 13 is provided with a head pipe 18 above the front end. A front fork 20 is provided on the head pipe 18 via a steering mechanism 19 so as to be rotatable left and right. A handle bar 21 is fixed to the upper end of the front fork 20. The front fork 20 has a front wheel 11 rotatably supported at a lower end, and a front fender 22 is provided so as to cover the front wheel 11.

  As shown in FIG. 2, the vehicle body frame 13 is bifurcated from the head pipe 18 to the left and right, and has a front frame 25 having a pair of left and right main frames 24 extending rearward and downward, and a rear upper portion of the front frame 25 A rear frame 26 extending rearward and upward is provided. The main frame 24 suspends the engine unit 14, and has a central body frame portion 24 a extending downward from the rear end portion of the main frame 24.

  The rear frame 26 includes a pair of left and right seat rails 28 extending rearward and upward from the rear upper end of the main frame 24, and a pair of left and right side frames 29 extending rearward and upward from the middle of the rear end of the body frame portion 24a. . The rear end portion of the seat rail 28 is joined to and integrated with the side frame 29. As shown in FIGS. 1 and 3, the seat 16 is placed on the seat rail 28.

  In addition, a pivot shaft 30 is installed at the center lower portion of the body frame portion 24a that forms a pair with the left and right of the front frame 25, and a swing arm 31 is supported around the pivot shaft 30 so as to be swingable in the vertical direction. The rear wheel 12 is rotatably supported at the rear end portion of the swing arm 31. The rear wheel 12 is supported so as to be buffered by a rear cushion unit 32 as a rear wheel suspension.

  The rear cushion unit 32 is disposed in a substantially vertical direction at a substantially central portion in the left-right direction (width direction) of the vehicle, and has an upper end portion on the body frame portion 24a side of the front frame 25 as shown in FIGS. The lower end is pin-coupled to one corner of the triangular link plate 33. One of the remaining corners of the link plate 33 is pin-coupled to the swing arm 31, and the other is pin-coupled to the lower end portion (mounting bracket) of the body frame portion 24 a via the link rod 34. The link plate 33 and the link rod 34 together with the body frame portion 24a and the swing arm 31 constitute a four-bar link mechanism 35. The rear cushion unit 32 supports the rear wheel 12 via the swing arm 31 and performs a buffering action to maintain a good riding comfort.

  In FIG. 1, reference numeral 37 is an upper cowling, reference numeral 38 is an under cowling, and reference numeral 39 is a rear cowling as a vehicle body rear cover.

  As shown in FIGS. 1, 3, and 4, the motorcycle 10 is covered with a rear fender 40 above the rear wheel 12. The rear fender 40 includes a rear fender lower 41 as an inner fender covering the upper front half of the rear wheel 12, a rear fender upper 42 covering the front half above the rear wheel 12, and a rear fender rear 43 covering the rear half above the rear wheel 12. Consists of The rear fender upper 42 is provided on the side frame 29 that forms a pair of left and right of the rear frame 26 from below. The rear fender lower 41 constituting the inner fender is installed on the upper part of the swing arm 31. A rear opening space 45 is formed between the rear fender upper 42 and the rear fender lower 41. The rear opening space 45 is widely opened on both sides in the vehicle width direction of the vehicle. Guided.

  Further, as shown in FIGS. 2 to 4, a rectifier 48 is installed across the side frames 29 that form a pair of left and right of the rear frame 26. The rectifier 48 is installed on the left and right side frames 29, 29 and is spanned between the side frames 29, 29 to constitute a frame strength member. Since the rectifier 48 is installed on the left and right side frames 29 and 29 to constitute the frame strength member, it is not necessary to provide a reinforcing member such as a bridge member at the mounting portion, and the number of bridge members 49 to be installed is reduced. Can do.

  A bridge member 49 for increasing the frame rigidity of the vehicle body frame 13 is also provided between the left and right seat rails 28 and 28. Further, the left and right sides of the upper seat rail 28 and the lower side frame 29 are connected to the rear frame 26 by, for example, an X-shaped reinforcing member 50, and the rear frame 26 is reinforced to physically Strength is improved.

  In the rear frame 26, a rectifier 48 is installed on a pair of left and right side frames 29, 29, and is spanned between the side frames 29, 29 so as to be directly fixed, whereby the rectifier 48 itself is configured as a frame strength member, and a bridge member The number of parts of the reinforcing member such as can be reduced. In addition, since a rectifier can be installed in place of the bridge member at the bridge member installation location between the left and right side frames 29, 29 of the rear frame 26, the degree of freedom of attachment of the rectifier 48 can be improved. . The attachment of the rectifier 48 is used for attachment of a bridge member or the like, and can be carried out using an attachment bracket of the side frame 29 fixed in advance. Therefore, a mounting bracket dedicated to the rectifier 48 is not required.

  Furthermore, the rectifier 48 installed on the pair of left and right side frames 29 of the rear frame 26 protrudes into the rear open space 45 below the rear fender upper 42 of the rear fender 40 and is exposed as shown in FIG. In the rectifier 48, the cooling fins 52 protrude into the rear open space 45 and are exposed, so that the rectifier 48 is directly exposed to the running wind, and the rectifier 48, which is a heat generating electrical component, increases heat dissipation by the cooling fins 52, thereby improving the cooling efficiency. Can be improved. In addition, since the rectifier 48 is installed on the side frame 29 of the rear frame 26 away from the engine unit 14, it is less affected by the heat from the engine, and has a high degree of freedom of installation in a place with good cooling conditions. This improves the flexibility of layout.

  By the way, in the rectifier mounting structure for a motorcycle according to this embodiment, a bottom view of the body frame 13 of the motorcycle 10 as viewed from below is represented as shown in FIGS. FIG. 6 shows a state before the rectifier 48 is attached. FIG. 7 shows the rectifier 48 attached. As shown in FIG. 6, inward mounting brackets 53 are fixed in advance to the pair of left and right side frames 29 by welding or the like, and the mounting bracket 53 is used to rectify by means of fastening means 54 such as bolts and nuts. The fire 48 is directly fixed. Therefore, the rectifier 48 can be directly clamped and fixed to the left and right side frames 29, 29 of the rear frame 26.

  The rectifier mounting structure of the motorcycle is configured as shown in FIG. The rectifier 48 is installed on the rear frame 26 of the vehicle body frame 13. Specifically, a rectifier 48 is installed on a side frame 29 that forms a pair of left and right of the rear frame 26, and the rectifier 48 is spanned between the left and right side frames 29, 29 and fixed. The rectifier 48 is directly fastened to the mounting brackets 53 of the left and right side frames 29 by the fastening means 54 and is exposed and fixed in the rear open space 45. Since the rectifier 48 is directly fixed to the left and right side frames 29, the heat dissipation of the rectifier 48 is improved. The rectifier 48 itself is installed between the left and right side frames 29, and both sides are directly fixed to constitute a frame strength member. Therefore, a reinforcing member such as a bridge member can be omitted at the installation location.

  The rectifier 48 is configured as shown in FIGS. 8 to 11 and includes an open box-shaped main body case 55 elongated in the installation direction. The main body case 55 is made of, for example, aluminum casting, and an open box structure is configured by providing a peripheral side wall 57 in an upright state around a rectangular case mounting plate (case bottom plate or case top plate) 56. The main body case 55 is provided with a substrate portion 58 of an electronic circuit (adjusting the AC output of the generator or adjusting the generated voltage to a constant voltage) in the central region of the case mounting plate 56. A housing recess 59 that houses the substrate portion 58 is integrated by a resin mold 60 and fixed to the main body case 55.

  In the rectifier 48, wiring 61 such as lead wires is connected to the substrate portion 58 as shown in FIGS. By this wiring 61, the rectifier 48 is connected to an alternator and a battery (both not shown).

  Further, the rectifier 48 is provided with attachment holes 63 at both ends in the longitudinal direction (erection direction) of the case attachment plate 56. The rectifier 48 is fastened and fixed to the mounting brackets 53 of the left and right side frames 29 by the fastening means 54 through the mounting holes 63. Therefore, the rectifier 48 can eliminate the dedicated mounting bracket, and the rectifier 48 can be directly tightened and fixed to the left and right side frames 29 using the existing general-purpose mounting bracket 53.

  On the other hand, in the rectifier 48, the peripheral side wall (standing wall) of the main body case 55 is configured as the outer peripheral fin 57. A plurality of inner fins 64 are provided on the case mounting plate 56 of the main body case 55 so as to be surrounded by the outer peripheral fins 57. The inner fin 64 is disposed in contact with the case mounting plate (case bottom plate, case top plate) so as to straddle the housing recess 59, and is configured to dissipate heat generated by the substrate portion 58 to the outside. The inner fins 64 are arranged in parallel to the longitudinal direction (the erection direction) of the main body case 55, and as shown in FIGS. It keeps good and improves heat dissipation.

  The outer peripheral fins 57 of the rectifier 48 are constituted by vertical peripheral side walls (standing or hanging) from the periphery of the case mounting plate 56 of the main body case 55, and are formed with four sides connected to the outer periphery of the rectifier 48. . It is desirable that the thickness of the outer peripheral fins 57 be thicker than the thickness of the inner fins 64. By configuring the outer peripheral fins 57 to be thicker than the inner fins 64, the rigidity is increased and the mechanical and physical strength is improved. For this reason, the rectifier 48 itself can be effectively used as a frame strength member. Further, by increasing the plate thickness of the outer peripheral fin 57 to form a box-like fin shape and making the outermost fin thicker than the inner fin 64, the rigidity of the body case 55 can be increased and the function as a strength member can be improved. it can.

  Further, among the peripheral fins 57, the opposing fins parallel to the longitudinal direction (construction direction) are made thicker than the remaining cooling fins 52, for example, other opposing fins, and the rectifier 48 is installed on the side frame 29. The strength in the bending direction can be improved. Furthermore, among the peripheral fins 57, the opposing fins parallel to the short direction (opposing to the longitudinal direction) are made thinner than the opposing fins parallel to the longitudinal direction, thereby improving rigidity and improving strength while reducing weight. This is an effective method.

  In addition, the inner fins 64 protrude from the outer peripheral fins 57, and the cooling fins 52 constituted by the outer peripheral fins 57 and the inner fins 64 are installed on the left and right side frames 29 as shown in FIGS. Furthermore, it protrudes into the rear open space 45 and is exposed. Therefore, when the motorcycle 10 is driven, the traveling wind can easily hit, the cooling performance can be improved, and the heat dissipation of the rectifier 48 can be improved.

  Furthermore, the attachment holes 63 of the rectifier 48 are formed on both sides in the longitudinal direction of the case attachment plate 56 of the main body case 55 as shown in FIGS. The attachment holes 63 are formed between the outer peripheral fins 57 and the inner fins 64 on both sides in the longitudinal direction of the case attachment plate 56. In addition, the tightening means 54 is formed in a mounting portion (bolt / nut tightening portion) surrounded by the outer peripheral fins 57 to maintain physical and mechanical strength. In particular, since the attachment portion of the tightening means 54 overlaps the opposing fin parallel to the longitudinal direction of the outer peripheral fin 57, the mechanical and physical strength of the main body case 55 can be improved, and the attachment rigidity You can plan up.

  In addition, the rectifier 48 is provided with a ventilation hole 65 penetrating the cooling fin 52 including the plurality of inner fins 64 and the outer peripheral fins 57 in the vicinity of the case mounting plate (case bottom plate) 56 of the inner fin 64 and in the vicinity of the substrate portion 58. . In the rectifier 48, the ventilation holes 65 are formed around the substrate portion 58 as openings for ventilation and drainage, so that the cooling effect of the substrate portion 58 is improved by the cooling air generated by the introduced traveling air, and the substrate portion 58. Therefore, heat dissipation can be improved. In addition, since the inner fin 64 protrudes from the outer peripheral fin 57, the cooling effect can be further improved.

  On the other hand, in the rectifier mounting structure for a motorcycle according to this embodiment, as shown in FIGS. 3 and 4, the rectifier 48 includes a rear fender lower 41 serving as an inner fender covering the front upper portion of the rear wheel 12 and the seat 16. The rear fender lower 41 is disposed in front of the vehicle body from the rear end 41a. Since the rectifier 48 is provided at a position where it overlaps the rear fender lower 41, it is possible to effectively prevent the muddy water and pebbles splashed by the rear wheel 12 from scattering to the rectifier 48. Therefore, the rectifier 48 can significantly reduce the adhesion of mud and the like splashed by the rear wheel 12.

  Further, in the rectifier mounting structure, the rectifier 48 is installed on the left and right side frames 29 and 29 between the left and right side frames 29 of the rear frame 26 and the rear fender lower 41 of the inner fender, as shown in FIG. Further, the cooling fins 52 of the rectifier 48 project downward from the rear fender upper 42 as shown in FIG. 3 (connected to the frame side cover 39a of the rear cowling 39), and the rear open space. 45 to be exposed.

  The traveling wind accompanying traveling of the motorcycle 10 flows rearward along the outer wall surface of the rear fender upper 42. For this reason, traveling wind can take the large contact area which contacts the cooling fin 52 of the rectifier 48, cooling efficiency can improve and heat dissipation can be improved.

  Further, the cooling fins 52 of the rectifier 48 are exposed to protrude into the rear open space 45 so as to face the lower side of the rear fender upper 42, and the rectifier 48 is connected to the cooling fins 52 for ventilation and drainage. Ventilation holes and drain holes 65 that are openings are provided. As shown in FIG. 5, the ventilation hole / water drain hole 65 is located below the outer wall surface of the rear fender upper 42 and is disposed so as to be exposed to the rear open space 45. The ventilation hole / drain hole 65 is formed through the inner fin 64 of the rectifier 48, so that the cooling effect by the traveling wind is improved and the heat dissipation is excellent.

[Effect of the first embodiment]
In the rectifier mounting structure for a motorcycle according to the first embodiment, since the rectifier 48 is installed on the side frame 29 of the rear frame 26, the rectifier is directly attached and tightened between the left and right side frames 29 of the rear frame. The rectifier itself can be configured as a strength member of the vehicle body. The rectifier 48 constitutes a strength member of the vehicle body and can also be used as a frame strength member. Therefore, a reinforcing member such as a bridge member can be eliminated in the attachment region of the rectifier 48.

  In addition, since a mounting bracket dedicated to rectifier attachment is not required and can be eliminated, the number of parts can be reduced, the number of processing and assembly steps can be reduced, the work can be simplified, and the weight can be reduced.

  Further, the rectifier 48 can increase the rigidity of the case portion by making the outer peripheral fin 57 thicker than the inner fin 64. The cooling fin 52 can improve the strength in the bending direction with respect to the rectifier attachment by increasing the thickness of the opposing fin in the longitudinal direction of the outer peripheral fin 57, and the thickness of the outer peripheral fin 57 facing in the longitudinal direction can be increased. By increasing the thickness and reducing the thickness of the other fins (the remaining fins (in the short side direction) and the inner fins 64) of the outer peripheral fin 57, the strength can be improved while reducing the weight.

  In addition, the rectifier 48 protrudes downward from the rear fender upper 42 and protrudes into the rear open space 45, and the cooling fin 52 allows the inner fin 64 to protrude from the outer peripheral fin 57 so that the traveling wind is evenly distributed. Since it becomes easy to hit and the contact area with the traveling wind increases, the cooling performance is improved and the heat dissipation can be improved. In the rectifier 48, the cooling fins 52 are exposed so as to face the traveling wind flowing rearward along the outer wall surface of the rear fender upper 42, so that the cooling effect can be further improved.

  In addition, a case mounting plate 56 surrounded by the standing wall of the outer peripheral fin 57 is formed, and the mounting portion of the main body case 55 is overlapped with the case mounting plate 56 and the outer peripheral fin 57. The strength of the mounting portion of the main body case 55 provided with the height is improved, and the rigidity can be increased.

  On the other hand, the rectifier 48 constituting the heat generating electrical component is formed with the ventilation holes 65 around the board portion 58 fixed in the main body case 55, so that traveling air (cooling air) introduced into the main body case 55 is formed. Thus, the substrate portion 58 can be effectively cooled, and the cooling effect is improved.

  In the rectifier mounting structure for a motorcycle, the rectifier 48 is mounted on the rear fender lower 41 of the inner fender so as to be overlapped, so that adhesion of mud and the like that the rear wheel 14 jumps up can be avoided and reduced.

[Second Embodiment]
Next, a second embodiment of the rectifier mounting structure for a motorcycle will be described with reference to FIGS.

  The rectifier mounting structure for a motorcycle shown in the second embodiment is different from the rectifier mounting structure for a motorcycle shown in the first embodiment except that the mounting mode of the rectifier is basically different. Since the overall configuration of the motorcycle is the same, common portions are denoted by the same reference numerals, and redundant description is omitted or simplified.

  In the rectifier mounting structure for a motorcycle shown in the second embodiment, the front and back of the rectifier 48 shown in the first embodiment are turned upside down and installed on the left and right side frames 29, 29 of the rear frame 26. An attachment aspect is shown. The rectifier upside down is indicated by reference numeral 48A. Since the structure of the rectifier itself is substantially the same as that of the rectifier 48 shown in the first embodiment, the same members are denoted by the same reference numerals, and description thereof is omitted.

  The rectifier 48A constituting the second embodiment has the rectifier attachment structure shown in FIG. The rectifier 48A is installed with the cooling fins 52 facing upward, and is fixed so as to be spanned between the left and right side frames 29, 29. The rectifier 48 </ b> A is installed on the left and right side frames 29, 29 of the rear frame 26 with the cooling fin 52 facing upward from the case mounting plate (case bottom plate) 56 of the main body case 55. Specifically, the rectifier 48A is fastened and fixed directly to the inward general-purpose mounting brackets 53 of the left and right side frames 29, 29 by means of bolt and nut fastening means 54. Since the rectifier 48A is directly fixed to the pair of left and right side frames 29, 29, it constitutes a strength member of the vehicle body of the rear frame 26 and also serves as a frame strength member. It is unnecessary to attach a reinforcing member such as a bridge member to the mounting portion of the rectifier 48A, and it can be omitted.

  Since the rectifier 48A is installed on the left and right side frames 29, 29 of the rear frame 26 with the cooling fins 52 facing upward, water may accumulate in the main body case 55. Therefore, the ventilation holes / drain holes 65 formed in the outer peripheral fins 57 of the rectifier 48 </ b> A function as water drain holes, and a plurality of drain holes 65, which are ventilation / drain openings, are provided on the standing wall of the outer fins 57. ing.

  Further, the drain hole 65 provided in the rectifier 48A is provided near the case mounting plate 56 at the portion where the outer peripheral fin 57 and the inner fin 64 overlap. In addition, the inner fin 64 in the overlapped portion is provided with a ventilation hole coaxially communicating with the water drain hole 65 provided in the standing wall of the outer peripheral fin 57. In addition, since the plurality of drain holes 65 provided in the standing wall of the outer peripheral fin 57 also serve as the air guide holes, the ventilation holes formed in the inner fins 64 communicate with each other, thereby improving the airflow of the traveling wind and the cooling effect. Can be improved.

[Effects of Second Embodiment]
Also in the second embodiment, the rectifier 48A is installed on the left and right side frames 29, 29 of the rear frame 26, is directly fixed by tightening, and functions as a strength member of the vehicle body. Therefore, since the mounting bracket for exclusive use of the rectifier can be eliminated, the number of parts can be reduced, the number of processing assembly steps can be reduced, and the weight can be reduced.

  The rectifier itself can also be used as a strength member of the vehicle body, and a conventional reinforcing member such as a bridge member can be omitted at the mounting portion. The degree of freedom in attaching the rectifier 48A and other peripheral parts to the side frame of the rear frame 26 is improved.

  Since the rectifier 48A is directly fixed to the left and right side frames 29, 29 of the rear frame 26, the heat generated by the rectifier 48A, which is a heat generating electrical component, can be released to the vehicle body rear frame 26 side. In addition, the rectifier 48A is exposed to the rear open space 45 and is actively cooled by the traveling wind flowing rearward along the outer wall surface of the rear fender upper 42, so that the cooling performance is improved and the heat dissipation is good. It becomes.

  The rectifier mounting structure for a motorcycle according to the second embodiment has substantially the same effects as the rectifier mounting structure for a motorcycle according to the first embodiment, and the lower exposed surface of the rectifier 48A has a smooth body case. Since it is a flat surface, it is possible to more effectively prevent the mud and the like that the rear wheel 12 has splashed up.

  In the embodiment of the present invention, an example is shown in which the rectifier is fixed to the left and right side frames of the rear frame by fastening means, but the rectifier is attached in a floating state by inserting rubber bushes in the left and right side frames. It can function as a dynamic damper.

  Further, the rectifier may be configured to be attached to the seat rail side of the rear frame.

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Front wheel, 12 ... Rear wheel, 13 ... Body frame, 14 ... Engine unit, 15 ... Fuel tank, 16 ... Seat, 18 ... Head pipe, 19 ... Steering mechanism, 20 ... Front fork, 21 ... Handle bar, 22 ... Front fender, 24 ... Main frame, 24a ... Body frame, 25 ... Front frame, 26 ... Rear frame, 28 ... Seat rail, 29 ... Side frame, 30 ... Pivot shaft, 31 ... Swing arm, 32 ... Rear cushion unit, 33 ... Link plate, 34 ... Link rod, 35 ... 4-bar linkage mechanism, 37 ... Upper cowling, 38 ... Under cowling, 39 ... Rear cowling, 40 ... Rear fender, 41 ... Rear fender lower (inner fender) 42 ... Upper rear fender, 43 ... Rear fe Dariya, 44 ... Footrest brat, 45 ... Rear open space, 48, 48A ... Rectifier, 49 ... Bridge member, 50 ... Reinforcing member, 52 ... Cooling fin, 53 ... Mounting bracket, 55 ... Body case, 56 ... Case mounting plate (Case bottom plate, case top plate), 57 ... outer peripheral fin, 58 ... substrate portion, 59 ... storage recess, 60 ... resin mold, 61 ... wiring (lead wire), 63 ... mounting hole, 64 ... inner fin, 65 ... vent hole・ Drain holes (ventilation / drainage holes).

Claims (12)

An engine unit suspended on a body frame is provided between a front wheel and a rear wheel, and the body frame is composed of left and right seat rails on which seats are installed and left and right side frames for reinforcement,
A rectifier mounting structure for a motorcycle, wherein a rectifier is installed on left and right side frames of the rear frame. The rectifier is integrated by a resin mold with a substrate portion housed in an elongated box-shaped main body case,
The rectifier attachment structure for a motorcycle according to claim 1, wherein the main body case is integrally provided with a rectangular case attachment plate having cooling fins having outer peripheral fins and inner fins. The plate thickness of the outer peripheral fin is formed thicker than the inner fin,
The rectifier mounting structure for a motorcycle according to claim 2, wherein the outer peripheral fins are configured such that opposing fins parallel to the installation direction to the left and right side frames are thicker than the remaining cooling fins. The cooling fin is provided with a plurality of inner fins in the outer peripheral fin,
The rectifier attachment structure for a motorcycle according to claim 2, wherein the inner fin is provided so as to protrude downward or upward from the outer peripheral fin. The motorcycle according to claim 1 or 2, wherein the rectifier is fastened to a mounting bracket of the left and right side frames by fastening means, and a cooling fin is provided to be exposed in a rear open space below the rear fender upper. Rectifier mounting structure. The rectifier attachment structure for a motorcycle according to claim 2 , wherein the rectifier is provided with attachment holes on both longitudinal sides of a case attachment plate of the main body case between the outer peripheral fin and the inner fin. The rectifier attachment structure for a motorcycle according to claim 2, wherein the rectifier is provided with ventilating and drainage openings in the standing wall of the outer peripheral fin. The rectifier attachment structure for a motorcycle according to claim 2, wherein the rectifier is provided with ventilation holes that penetrate the plurality of inner fins in the vicinity of the substrate portion of the main body case. The ventilation hole provided in the rectifier is coaxial with the ventilation / drainage opening provided in the standing wall of the outer peripheral fin, and the opening of the portion where the outer peripheral fin and the inner fin overlap in a side view. The rectifier attachment structure for a motorcycle according to claim 8, wherein the rectifier attachment structure is formed in communication with the top. 2. The rectifier mounting structure for a motorcycle according to claim 1, wherein the rectifier is disposed between the seat and a rear fender lower covering the rear wheel, on a front side of a vehicle body from a rear end portion of the rear fender lower. The rectifier is disposed between the side frame and the rear fender lower so that a cooling fin faces a part of a rear fender upper connected to a frame side cover of a rear cowling. Rectifier mounting structure for motorcycles. The cooling fins are arranged to face downward from the outer wall surface of the rear fender upper, in claim 11 provided wherein the rectifier ventilation for-drainage openings is exposed to the rear open space under the rear fender upper Motorcycle rectifier mounting structure as described.

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