CN219904616U

CN219904616U - Saddle-ride type vehicle

Info

Publication number: CN219904616U
Application number: CN202320466839.9U
Authority: CN
Inventors: 山田卓希; 中西孝文; 钟尾僚太
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2022-03-30
Filing date: 2023-03-13
Publication date: 2023-10-27
Anticipated expiration: 2033-03-13
Also published as: JP7462694B2; JP2023148200A

Abstract

A motorcycle, comprising: a vehicle body frame (20) having a pair of left and right rear frame front portions (24 a), the pair of left and right rear frame front portions (24 a) extending rearward and upward when viewed from the side; a vehicle body side bracket (50) that includes a pair of left and right side plate portions (51) protruding rearward from a rear frame front portion (24 a); a pivot (80) supported by the vehicle body side bracket (50) and extending in the vehicle width direction between the pair of left and right side plate portions (51); a link (70) swingably supported by the vehicle body side bracket (50) via a pivot (80); and a power unit including a connection section connected to the link (70) at an upper end of the power unit. An opening (60) is formed in the vehicle body side bracket (50), and a link (70) is inserted through the opening (60). The opening (60) extends from a portion located behind the pivot (80) to the upper ends of the pair of side plate portions (51).

Description

Saddle-ride type vehicle

Technical Field

The present utility model relates to a straddle-type vehicle.

Background

Conventionally, among straddle-type vehicles having a unit swing type rear suspension, a straddle-type vehicle in which an upper portion of an engine is supported by a vehicle body frame via a pivot is known in the art (for example, see japanese patent laid-open No. 4291184). In some straddle-type vehicles of this type, brackets supporting the pivot are coupled to various portions of the body frame. The bracket includes a pair of right and left plate portions. These plate portions are coupled to the vehicle body frame and are arranged at a distance from each other in the vehicle width direction. Further, the pair of right and left plate portions have through holes through which the pivot shafts are inserted.

As the stiffness of the bracket supporting the pivot increases, the flexibility of the bracket becomes smaller to bear the load of the pivot. Accordingly, the shape of the bracket needs to be adjusted accordingly to maintain the supporting strength of the link with respect to the bracket. Accordingly, a configuration is desired in which the support strength of the link with respect to the bracket can be maintained while simplifying the bracket.

Disclosure of Invention

An object of the present utility model is to provide a straddle-type vehicle including a unit swing type power unit in which a support strength of a link can be maintained while simplifying a bracket.

A straddle-type vehicle according to an aspect of the present utility model includes: a vehicle body frame including a left and right pair of pivot frames extending rearward when viewed from a side; a vehicle body side bracket including a pair of left and right side plate portions protruding rearward from the pivot frame; a pivot shaft that is supported by the vehicle body side bracket and that extends in the vehicle width direction between the pair of side plate portions; a link pivotally supported by the vehicle body side bracket via a pivot; and a power unit including a connection section connected to the link, wherein an opening portion through which the link is inserted is formed on the vehicle body side bracket, and the opening portion continues from a portion located rearward of the pivot shaft to upper ends of the pair of side plate portions.

According to the present utility model, since the pair of side plate portions are not connected to each other above the pivot shaft, the rigidity of the vehicle-body side bracket can be sufficiently maintained as needed while simplifying the portion of the vehicle-body side bracket located above the pivot shaft. Therefore, when the power unit swings, the vehicle body side bracket can flexibly receive the load applied to the pivot shaft via the link. Therefore, the support strength of the link can be maintained while simplifying the configuration of the vehicle body side bracket.

In the above-described straddle-type vehicle, the pair of side plate portions is allowed to include the support section that supports the pivot shaft, and the pair of side plate portions extend from the support section along the extending direction of the pivot frame such that the distance between the side plate portions gradually becomes wider as the side plate portions extend rearward and upward.

According to the present utility model, in a configuration in which the pair of side plate portions are formed such that the gap between the support sections is narrowed according to the width of the link, it is possible to suppress the formation of stress concentration areas on the side plate portions around the opening portions. Therefore, deterioration of the supporting strength of the connecting rod can be suppressed.

In the above-described straddle-type vehicle, the pair of side plate portions is allowed to extend such that the distance between the side plate portions gradually becomes wider as the side plate portions extend forward and downward from the support section along the extending direction of the pivot frame.

According to the present utility model, it is possible to suppress the formation of stress concentration regions on the upper and lower sides of the span support sections of the side plate sections. Therefore, deterioration of the supporting strength of the connecting rod can be more effectively suppressed.

In the above-described straddle-type vehicle, the vehicle body-side bracket is allowed to include a rear plate portion that extends forward and downward along the pivot frame from a portion located below the pivot shaft, and that connects rear edges of portions of the pair of side plate portions located forward and below the pivot shaft, the rear plate portion supporting the rear seat pedal.

According to the present utility model, it is possible to maintain the necessary and sufficient rigidity of the vehicle body side bracket as a whole, while maintaining the rigidity for supporting the rear seat pedal.

In the above-described straddle-type vehicle, each of the pair of side plate portions is allowed to be arranged at a distance in the vehicle width direction such that a center axis line of the pivot frame is sandwiched between the pair of side plate portions when viewed from the rear.

According to the present utility model, since the coupling structure between the pair of side plate portions and the pivot frame can be made symmetrical, the pair of side plate portions can receive the load applied to the pivot in an even manner, and the formation of the stress concentration region on the vehicle body side bracket can be suppressed.

According to the present utility model, in a straddle-type vehicle including a unit swing type power unit, it is possible to maintain the support strength of a link while simplifying a bracket.

Drawings

Fig. 1 is a left side view of a motorcycle according to an embodiment.

Fig. 2 is a left side view showing a rear section of the motorcycle shown in fig. 1.

Fig. 3 is a perspective view showing an enlarged view of a portion of the rear section of the motorcycle shown in fig. 2.

Fig. 4 is a left side view showing an enlarged view of a portion of the rear section of the motorcycle shown in fig. 2.

Fig. 5 is a rear view showing a left half section of a part of the motorcycle shown in fig. 2.

Detailed Description

Embodiments of the present utility model are explained below with reference to the drawings. In the following description, the same reference numerals are attached to structural members having the same or similar functions. Repeated descriptions of these components may be omitted. The directions in the following description such as front, rear, up, down, left and right are the same as those in the vehicle described below. In other words, the up-down direction corresponds to the vertical direction, and the left-right direction corresponds to the vehicle width direction. In the drawings used in the following explanation, arrows UP, FR, and LH represent upward, forward, and leftward directions, respectively.

Vehicle overall configuration

Fig. 1 is a left side view of a motorcycle according to an embodiment.

As shown in fig. 1, a motorcycle 1 according to the present embodiment is an example of a straddle-type vehicle. The motorcycle 1 is a scooter type vehicle including a pedal 5, and a rider sitting on a seat 4 places his/her feet on the pedal 5. The motorcycle 1 includes a front wheel 2, a rear wheel 3, a body frame 20, a vehicle cover 30, a power unit 40, a body side bracket 50, a link 70, and a pivot 80.

The front wheel 2 is pivotally supported by lower end portions of a pair of left and right front forks 11 of a front wheel suspension system 10. The front wheel suspension system 10 is rotatably supported by the front end of the vehicle body frame 20. A bar handle 12 for steering is attached to the upper section of the front wheel suspension system 10.

The vehicle body frame 20 includes a head pipe 21, a lower frame 22, an underframe 23, and a rear frame 24, and these components are integrally connected by welding or the like. The head pipe 21 is disposed at the front end of the body frame 20. The lower frame 22 is coupled to the head pipe 21. The lower frame 22 extends downward from the head pipe 21. The bottom frames 23 are provided in a pair on the left and right. The bottom frame 23 is coupled to a lower section of the lower frame 22. The bottom frame 23 extends rearward from the lower section of the lower frame 22. The rear frames 24 are arranged in a pair left and right. A rear frame 24 is coupled to the rear section of each chassis 23. The rear frame 24 is coupled to a portion located forward of the rear end portion of the bottom frame 23. The rear frame 24 is formed in a cylindrical shape. Each rear frame 24 includes a rear frame front section 24a (pivot frame) and a rear frame rear section 24b, the rear frame front section 24a extending rearward from the coupling portion of the rear frame 24 and the bottom frame 23, and the rear frame rear section 24b extending rearward from the upper end of the rear frame front section 24a at a more gentle slope than the rear frame front section 24a. The rear frame 24 supports the seat 4.

The vehicle cover 30 forms the outer shell of the vehicle. The vehicle cover 30 includes a front cover 31, a handlebar cover 32, a leg shield 33, a lower cover 34, and a rear cover 35. The front cover 31 covers the head pipe 21. The handle bar cover 32 covers a central portion of the bar handle 12. The leg shield 33 covers the lower frame 22 and covers the legs of the driver from the front. The lower cover 34 covers the bottom chassis 23. A pedal 5 is formed on an upper surface of the lower cover 34, and a rider places his/her foot on the pedal 5. The rear cover 35 extends rearward and upward from the lower cover 34. The rear cover 35 covers the rear frame 24 from the front and from the outside in the vehicle width direction. The seat 4 is arranged above the rear cover 35. The vehicle cover 30 is constituted by a plurality of exterior panels. Each of these outer panels need not be divided into the individual segments described above, but may be arranged across the boundary of each segment, or each segment may be made up of a plurality of outer panels.

The power unit 40 forms a so-called unit swing type rear suspension together with the rear cushion 7. The power unit 40 drives the rear wheel 3 as a driving wheel. The power unit 40 is swingably supported by the body frame 20 in the up-down direction. The power unit 40 is disposed across the front of the rear wheel 3 and the left side of the rear wheel 3.

As shown in fig. 2, the power unit 40 integrally includes an engine 41 as a motor and a transmission mechanism 46 that transmits the output of the engine 41 to the rear wheel 3.

The engine 41 includes a crankcase 43 and a cylinder 44. The crank case 43 accommodates a crankshaft. The cylinder 44 protrudes forward from the front end portion of the crankcase 43. The piston is slidably disposed within the cylinder 44. The reciprocating motion of the piston rotates the crankshaft. The output of the engine 41 is transmitted from the crankshaft to the rear wheel 3 via the power transmission mechanism 46.

The power transmission mechanism 46 transmits the rotational driving force of the crankshaft to the wheel axle of the rear wheel 3. The power transmission mechanism 46 includes a transmission, a centrifugal clutch, a driven shaft, and a reduction mechanism. The transmission is, for example, a V-belt type continuously variable transmission. The centrifugal clutch transmits the output of the transmission to the driven shaft when the rotational speed of the crankshaft exceeds a predetermined value. The reduction mechanism reduces the rotation of the driven shaft and transmits the reduced rotation to the axle of the rear wheel 3. Accordingly, by transmitting the rotational driving force of the crankshaft to the wheel axle via the transmission, the centrifugal clutch, the driven shaft, and the reduction mechanism, the rear wheel 3 supported by the wheel axle is driven to drive the vehicle.

A transmission case 47 is connected to the left side of the crankcase 43. The transmission case 47 forms an outer body of the power unit 40 together with the crankcase 43. The transmission case 47 accommodates the power transmission mechanism 46. The transmission case 47 includes an inner case that constitutes an inner section of the transmission case 47 in the vehicle width direction and an outer case 47a that constitutes an outer section of the transmission case 47 in the vehicle width direction. The inner case is integrally formed with the crankcase 43. The inner box is box-shaped extending in the front-rear direction and opening on the outer side in the vehicle width direction. The outer case 47a is formed in a box shape that extends in the front-rear direction and opens on the inner side in the vehicle width direction. The inside of the transmission case 47 communicates with the inside of the left rear frame front portion 24a via a connection pipe 48. The transmission case 47 is connected to the rear frame rear portion 24b via the rear bumper 7. Therefore, the rear cushion 7 is disposed only on the left side with respect to the vehicle width center of the vehicle. An air cleaner 49 is arranged above the transmission case 47.

A connection section 45 connected to the body frame 20 is provided on the outer body of the power unit 40. The connection sections 45 are provided in a pair left and right. The left and right connecting sections 45 are arranged with a distance therebetween in the vehicle width direction. The connecting section 45 is provided at an upper section of the crankcase 43. The connecting section 45 protrudes upward from the upper surface of the crankcase 43. Alternatively, the left connecting section 45 may be provided on the outer case 47a of the transmission case 47. An insertion hole penetrating in the vehicle width direction is formed in each connection section 45, and these holes are coaxial with each other. One bolt 82 is inserted into the two insertion holes via a cylindrical elastic member, not shown.

Fig. 3 is a perspective view showing an enlarged view of a portion of the rear section of the motorcycle shown in fig. 2. Fig. 4 is a left side view showing an enlarged view of a portion of the rear section of the motorcycle shown in fig. 2.

As shown in fig. 3 and 4, the vehicle-body-side brackets 50 are provided in a pair left and right, and one vehicle-body-side bracket 50 is provided corresponding to one rear frame 24. Each of the body side brackets 50 is coupled to the rear frame front portion 24a. Each of the vehicle body side brackets 50 includes a pair of left and right side plate portions 51 and a rear plate portion 58, the pair of side plate portions 51 projecting rearward from the side surface of the cylindrical portion of the rear frame front portion 24a when viewed from the side, the rear plate portion 58 extends in the vehicle width direction and connects the pair of side plate portions 51 to each other. Each of the vehicle body side brackets 50 is formed of a single metal plate, and includes a bent section at a boundary portion between the pair of side plate portions 51 and the rear plate portion 58. The side plate portions 51 are arranged at a distance in the vehicle width direction such that a center axis line of the rear frame front portion 24a is sandwiched between the side plate portions 51 when viewed from the rear (see also fig. 5).

The left vehicle body side bracket 50 will be explained below.

The side panel portion 51 includes a front edge 52 extending along the rear frame front portion 24a. The front edge 52 overlaps the outer surface of the rear shelf 24 and is welded to the rear shelf 24. Notches 54a and 54b are formed in front edge 52. The notches 54a and 54b include an upper notch 54a and a lower notch 54b disposed at a spaced distance from each other. Front edge 52 is welded to rear frame 24 by avoiding notches 54a and 54b. Therefore, welded portions between the rear frame 24 and the side plate portions 51 are formed at three positions spaced apart by a certain distance along the extending direction of the rear frame 24. When viewed from the side, the lower end edge of the side plate portion 51 overlaps with the upper portion of the rear end portion of the chassis 23, and is welded to the chassis 23.

The side plate portion 51 is formed such that an upper half portion thereof protrudes rearward and downward than a lower half portion thereof. The upper half of each side plate portion 51 includes a pivot support section 56 that supports a pivot 80. A through hole 56a is formed on the pivot support section 56. A through hole 56a is formed in each side plate portion 51 in the vehicle width direction. The pivot 80 is inserted into the through hole 56 a. The pivot shaft 80 extends between the paired side plate portions 51 in the vehicle width direction. The pivot shaft 80 is fastened to the pair of side plate portions 51. The through hole 56a is formed at the same position as the upper notch 54a in the extending direction of the rear frame front section 24a. Therefore, the portion of the front edge 52 of the side plate portion 51 closest to the through hole 56a is not welded to the rear frame 24.

The side plate portion 51 includes a rear edge 53, and the rear edge 53 extends across a lower end portion and an upper end portion of the side plate portion 51 in a rear-lower direction of the front edge 52. The rear edge 53 includes a concave portion 53a recessed toward the front when viewed from the side. The concave portion 53a is provided at a position corresponding to the pivot support section 56, and extends rearward from below the through hole 56a when viewed from the side. The rear edge 53 extends rearward and upward from the upper end of the concave portion 53a at a steeper slope than the front edge 52, and is connected to the upper end portion of the front edge 52. The rear edge 53 extends forward and downward from the lower end of the concave portion 53a.

As shown in fig. 3 and 5, the side plate portions 51 are curved such that the respective pivot support sections 56 are closer to each other. In particular, the pivot support sections 56 of the side plate portions 51 on the outer side in the vehicle width direction are located on the innermost side in the vehicle width direction, and the pivot support sections 56 of the side plate portions 51 on the outer side in the vehicle width direction are located on the outermost side in the vehicle width direction. The distance between the pivot support sections 56 of the side plate portions 51 is narrower than the width of the rear frame front portion 24a when viewed from the rear. The side plate portions 51 extend smoothly from the front edge 52 toward the pivot support section 56 such that the distance between the side plate portions 51 becomes gradually narrower. The side plate portions 51 smoothly curve and extend such that the distance between the side plate portions 51 gradually widens as the side plate portions 51 extend rearward and upward from the pivot support sections 56 along the extending direction of the rear frame front section 24a. Further, the side plate portions 51 are smoothly curved and extended such that the distance between the side plate portions 51 gradually becomes wider as the side plate portions 51 extend forward and downward from the pivot support sections 56 along the extending direction of the rear frame front portion 24a. In this embodiment, the term "smoothly" means that the curvature of the front and rear surfaces is continuous. Alternatively, the side plate portions 51 may extend such that the distance between the side plate portions 51 gradually widens via the small stepped portions.

The rear plate portion 58 connects the rear edges 53 of the side plate portions 51 to each other. The rear plate portion 58 connects the rear edges 53 to each other in the forward and downward directions of the concave portion 53a of the rear edge 53. The rear plate portion 58 extends forwardly and downwardly from a portion thereof below the pivot 80. The rear plate portion 58 is continuously connected across the entire portion of the rear edge 53 of the side plate portion 51 located forward and downward of the concave portion 53a. A through hole is formed on the rear plate portion 58, through which the connection pipe 48 is inserted.

An opening 60 communicating with the space between the side plate portions 51 is formed in the vehicle body side bracket 50. The opening 60 continuously spans the portion located rearward of the pivot 80 and the upper ends of the side plate 51. The opening 60 is formed by a portion extending above the recessed portion 53a of each rear edge 53 of the side plate portion 51 and the upper end of the opening 60, the upper end edge of the rear plate portion 58, and the outer peripheral surface of the rear frame 24.

The right body side bracket 50 will be explained below.

As shown in fig. 3, the shape of the portion of the side plate portion 51 located above the pivot support section 56 in the right vehicle body side bracket 50 is different from that in the left vehicle body side bracket 50, and the other components of the right vehicle body side bracket 50 are formed symmetrically with the components of the left vehicle body side bracket 50. The pair of side plate portions 51 extend from the pivot support section 56 in the extending direction of the rear frame front portion 24a in almost parallel to each other in the rearward and upward direction. The upper end portion of the front edge 52 of the side plate portion 51 is located below the upper end portion of the front edge 52 of the side plate portion 51 of the left vehicle body side bracket 50.

The stay 84 and the support member 86 are coupled to each of the body-side brackets 50 so as not to be relatively displaceable. The stay 84 is formed of a metal material. The stay 84 is coupled to the rear plate portion 58 of the vehicle body side bracket 50 from below. In this embodiment, the brace 84 is welded to the back plate portion 58. The stay 84 includes a protruding portion 84a protruding rearward from the rear edge of the rear plate portion 58.

The support member 86 is formed of a metallic material. The support member 86 has a cylindrical shape. The support member 86 includes a coupling portion 86a coupled to the vehicle body-side bracket 50 and an extension portion 86b extending outwardly from the coupling portion 86a in the vehicle width direction. The coupling portion 86a extends in the vehicle width direction and is mainly welded to the rear plate portion 58 of the vehicle body side bracket 50. The coupling portion 86a is welded to the rear plate portion 58 across the entire length of the rear plate portion 58 in the vehicle width direction with respect to the rear plate portion 58. The extension portion 86b extends outward in the vehicle width direction from the vehicle body side bracket 50, and supports the rear seat pedal 6.

The link 70 is disposed above the power unit 40 when viewed from the side. The link 70 is swingably supported by the vehicle body side bracket 50 via a pivot 80. The connecting rod 70 includes a pair of left and right frame-side shaft support sections 71 supported by a pivot 80, a pair of left and right connecting members 72 extending in the front-rear direction and coupled at the front ends thereof with the frame-side shaft support sections 71, an engine-side shaft support section 73 supported by the crankcase 43, a pair of left and right connecting pipes 74 connecting the engine-side shaft support section 73 and the left and right connecting members 72, and a bracket 75 coupled to the connecting pipes 74.

The frame-side shaft support section 71 is disposed between the side plate portions 51 of each of the vehicle-body side brackets 50. The frame-side shaft support section 71 is formed of a metallic material. The frame-side shaft support section 71 is of a cylindrical shape extending in the vehicle width direction, and is inserted into the pivot shaft 80 from the outside. The frame-side bearing section 71 is rotatable with respect to the pivot shaft 80 and the vehicle-body-side bracket 50.

Each of the connecting members 72 is inserted into the opening portion 60 of the vehicle body side bracket 50 such that the front end thereof is positioned between the pair of side plate portions 51. The connection member 72 is formed of a metal material. The connecting member 72 is coupled to the frame-side shaft support section 71 so as not to be relatively displaceable. In the present embodiment, the connecting member 72 is welded to the frame-side shaft support section 71. The portion of the connecting member 72 that protrudes rearward from the opening 60 of the vehicle body side bracket 50 is spaced from the protruding portion 84a of the ground stay 84 from above. The connecting member 72 defines the lower end of the swing range by contacting the protruding portion 84a.

The engine-side shaft support section 73 is formed of a metallic material. The engine-side shaft support section 73 is of a cylindrical shape extending in the vehicle width direction. The engine-side shaft support section 73 is arranged rearward and downward of the pivot shaft 80. The engine-side shaft support section 73 is disposed between the pair of connecting sections 45 of the power unit 40. The bolts 82 inserted into the insertion holes of the connecting section 45 of the power unit 40 are inserted into the engine-side shaft support section 73. The engine-side shaft support section 73 pivotally supports the power unit 40 via bolts 82. The damper member 76 is mounted to the engine on the sideshaft support segment 73. The shock absorbing member 76 is an elastic member such as rubber. The damper member 76 is interposed between the engine-side shaft support section 73 and the crankcase 43.

The connection pipe 74 is formed of a metal material. The connection pipe 74 is coupled to the rear end portion of the connection member 72 outside the opening portion 60 of the vehicle body side bracket 50 so as not to be relatively displaceable. In the present embodiment, the connection pipe 74 is welded to the connection member 72. Each connection pipe 74 extends inward in the vehicle width direction from a coupling portion where the connection pipe 74 is coupled with the connection member 72, and then bends and extends downward. The rear end portions of the connection pipes 74 are arranged at a distance from each other in the vehicle width direction, and are coupled to the engine-side shaft support section 73 so as to be relatively non-displaceable. In the present embodiment, the connection pipe 74 is welded to the engine-side shaft support section 73.

The brackets 75 are provided in a pair left and right, and each bracket 75 is provided for one connection pipe 74 on the corresponding side. The bracket 75 is formed of a metal material. The bracket 75 is formed of a plate material in which a front surface and a rear surface thereof are arranged to face in the vehicle width direction. The bracket 75 is coupled to a portion of the connection pipe 74 extending in the vehicle width direction so as not to be relatively displaceable. The bracket 75 extends downward from the connection pipe 74. The lower end portion of the bracket 75 is located outside the engine-side shaft support section 73 in the vehicle width direction. The lower end portion of the bracket 75 is positioned on the opposite side of the engine-side shaft support section 73 across the connecting section 45 of the power unit 40. An insertion hole 75a coaxial with the engine-side shaft support section 73 is formed on a lower end portion of the bracket 75. The bolt 82 is inserted through the insertion hole 75 a. Bolts 82 are fastened to the pair of brackets 75. Thus, the link 70 fixes the bolt 82 and swingably supports the power unit 40 via the bolt 82.

In the conventional configuration, the opening portion of the vehicle body side bracket is formed such that it does not extend from a portion located rearward of the pivot shaft to the upper end of the side plate portion, with the link inserted through the opening portion. In this conventional configuration, since the vehicle body side bracket includes the member that connects the rear edges of the side plate portions above the pivot shafts, the pair of side plate portions can become less flexible, and the rigidity of the vehicle body side bracket can become higher than necessary. In this configuration, it is necessary to adjust the length of the member connecting the rear edges of the side plate portions to increase the residual axial force of the pivot section.

In the vehicle body side bracket 50 according to the present embodiment, an opening portion 60 is formed thereon, the link 70 is inserted through the opening portion 60, and the opening portion 60 continues from a portion located rearward of the pivot shaft 80 to the upper end of the side plate portion 51. According to this configuration, since the side plate portions 51 are not connected to each other above the pivot shafts 80, the rigidity of the vehicle-body-side bracket 50 can be sufficiently maintained as needed while simplifying the portion of the vehicle-body-side bracket 50 above the pivot shafts 80. Therefore, when the power unit 40 swings, the vehicle-body-side bracket 50 can flexibly receive the load applied to the pivot shaft 80 via the link 70. Therefore, the support strength of the link 70 can be maintained while simplifying the configuration of the vehicle body side bracket 50.

Further, since the vehicle body side bracket 50 can flexibly receive the load applied to the pivot shaft 80, the power unit 40 supported by the pivot shaft 80 can be allowed to twist slightly, and the operation stability can be improved.

The side plate portions 51 extend such that the distance between the side plate portions 51 gradually becomes wider as the side plate portions 51 extend rearward and upward from the pivot support sections 56 along the extending direction of the rear frame front section 24a. According to this configuration, in a configuration in which the pair of side plate portions 51 are formed such that the distance between the pivot support sections 56 is narrowed according to the width of the frame-side shaft support section 71 of the link 70, it is possible to suppress the formation of stress concentration areas on the side plate portions 51 around the opening portion 60. Therefore, deterioration of the supporting strength of the link 70 can be suppressed.

The side plate portions 51 extend smoothly such that the distance between the side plate portions 51 becomes wider as the side plate portions 51 extend forward and downward from the pivot support sections 56 along the extending direction of the rear frame front portion 24a. According to this configuration, it is possible to suppress the formation of stress concentration areas on the upper and lower sides of the side plate portion 51 across the pivot support section 56. Therefore, deterioration of the supporting strength of the link 70 can be more effectively suppressed.

The vehicle body side bracket 50 includes a rear plate portion 58, which rear plate portion 58 extends forward and downward from a portion below the pivot shaft 80, and connects the rear edges 53 of the side plate portions 51 to each other, and the rear plate portion 58 supports the rear seat pedal 6. According to this configuration, it is possible to integrally maintain the necessary and sufficient rigidity of the vehicle body side bracket 50 while ensuring the rigidity thereof for supporting the rear seat pedal 6.

In each of the vehicle body side brackets 50, a pair of side plate portions 51 are arranged at a distance apart between the pair of side plate portions 51 in the vehicle width direction such that a center axis line of the rear frame front portion 24a is sandwiched between the pair of side plate portions 51 when viewed from the rear. According to this configuration, since the coupling structure between the pair of side plate portions 51 and the rear frame front portion 24a can be made symmetrical, the pair of side plate portions 51 can receive the load applied to the pivot shaft 80 in an even manner, and the formation of the stress concentration region on the vehicle body side bracket 50 can be suppressed.

The portion of the front edge 52 of the side plate portion 51 closest to the pivot support section 56 is not welded to the rear frame 24. Accordingly, the pivot support section 56 can be easily bent, and the vehicle body side bracket 50 can more flexibly receive the load applied to the pivot 80.

The rear cushion 7 is connected only to the left side portion of the power unit 40 (swing arm). In this configuration, when the power unit 40 swings, a large force is applied to the left body-side bracket 50 of the pair of right and left body-side brackets 50. In the present embodiment, since the upper end of the right body-side bracket 50 (the upper end of the side plate portion 51) is lower than the upper end of the left body-side bracket 50, it is more easily deformed when its size is reduced, allowing it to more flexibly receive the load applied to the pivot shaft 80. Accordingly, the deformation of the left and right body-side brackets 50, 50 caused by the swing of the power unit 40 can be equalized, thereby improving the operation stability.

The present utility model can be applied to all straddle-type vehicles in which a driver straddles a vehicle body. In other words, the present utility model is applicable not only to motorcycles but also to motorcycles. Further, the present utility model may be applied to a vehicle having a power unit including a power motor as a motor.

The present utility model is not limited to the embodiments described above with reference to the drawings, and various changes are possible within the technical scope of the present utility model.

For example, in the above-described embodiment, the pivot support sections 56 in each of the vehicle body-side brackets 50 are bent such that the pivot support sections 56 are close to each other; however, the present utility model is not limited to this configuration. For example, the side plate portion of the vehicle body side bracket may extend rearward and downward almost parallel to each other from a coupling portion where the side plate portion and the rear frame are coupled.

In the above-described embodiment, the pair of vehicle-body-side brackets 50 are asymmetric left-right with respect to each other; however, the pair of body side brackets may be formed to be bilaterally symmetrical with respect to each other.

Furthermore, it is possible to replace the components explained in the above-described embodiments with components known in the art as long as the configuration does not depart from the object of the present utility model.

Claims

1. A straddle-type vehicle comprising:

a vehicle body frame (20), the vehicle body frame (20) including a pair of left and right pivot frames (24 a), the pair of left and right pivot frames (24 a) extending rearward when viewed from the side;

a vehicle body side bracket (50), wherein the vehicle body side bracket (50) comprises a pair of left and right side plate parts (51) protruding backwards from the pivot frame (24 a);

a pivot shaft (80), the pivot shaft (80) being supported by the vehicle body side bracket (50) and extending in the vehicle width direction between the pair of side plate portions (51);

a link (70), the link (70) being pivotably supported by the vehicle-body-side bracket (50) via the pivot (80); and

a power unit (40), the power unit (40) comprising a connection section (45) connected to the link (70), wherein

An opening (60) is formed in the vehicle body side bracket (50), the link (70) is inserted through the opening (60), and

the opening (60) continues from a portion located rearward of the pivot (80) to upper ends of the pair of side plate portions (51).

2. The straddle-type vehicle according to claim 1, wherein the pair of side plate portions (51) includes a support section (56) that supports the pivot shaft (80), and the pair of side plate portions (51) extend from the support section (56) along an extending direction of the pivot frame (24 a) such that a distance between the side plate portions (51) gradually becomes wider as the side plate portions (51) extend rearward and upward.

3. The straddle-type vehicle according to claim 2, wherein the pair of side plate portions (51) extend such that a distance between the side plate portions (51) gradually becomes wider as the side plate portions (51) extend forward and downward from the support section (56) along an extending direction of the pivot frame (24 a).

4. A straddle-type vehicle according to any one of claims 1 to 3, wherein the vehicle body-side bracket (50) includes a rear plate portion (58), the rear plate portion (58) extends forward and downward along the pivot frame (24 a) from a portion located below the pivot shaft (80), and connects rear edges (53) of portions of the pair of side plate portions (51) located forward and downward of the pivot shaft (80), and

the rear plate portion (58) supports the rear seat pedal (6).

5. The straddle-type vehicle according to any one of claims 1 to 4, wherein each side plate portion (51) of the pair of side plate portions (51) is arranged at a distance in a vehicle width direction such that a center axis line of the pivot frame (24 a) is sandwiched between the pair of side plate portions (51) when viewed from the rear.