JP4459851B2 - Frame structure of saddle riding type vehicle - Google Patents

Description

  The present invention relates to a frame structure of a straddle-type vehicle, and more particularly to a frame structure of a straddle-type vehicle suitable for a three-wheel or four-wheel vehicle traveling on rough terrain.

Generally, a saddle riding type vehicle traveling on rough terrain has a body frame assembled by welding pipe-shaped frame members, and wheels are supported on the body frame via suspension arms.
In recent years, a so-called bolt-on type frame in which a pair of divided frames divided into left and right parts are fastened and assembled with bolts and nuts has been adopted in order to facilitate assembly and reduce weight by simplifying the structure ( For example, see Patent Document 1).
JP-A-1-109186

  By the way, in the frame structure of patent document 1, the overhang | projection part in which the hole part which penetrates a volt | bolt is formed in the outer peripheral side of a division | segmentation frame is provided, and these overhang parts are integrated by fastening and fixing with a volt | bolt nut. However, there is a problem that the appearance is damaged by the overhanging portion.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a frame structure of a straddle-type vehicle capable of easily integrating a pair of divided frames while obtaining a good appearance. It is in.

To achieve the above object, a first aspect of the present invention, there is provided a frame structure of a straddle-type vehicle, comprising a pair of left and right divided frames that will be bonded against each other, the outer surface of the pair of divided frames A plurality of suspension arm support portions for supporting the suspension arm for suspending the wheels, and a plurality of fixing portions for coupling the pair of divided frames , the fixing portion being provided in the vicinity of the suspension arm support portion The bolts and nuts are arranged in a spot facing formed on the outer surface of the split frame so as not to protrude from the outer surface inside the outer periphery of the pair of left and right split frames, and at least the fixed portion One is characterized by being covered with a suspension arm support .

In the invention according to claim 2 , in addition to the configuration of claim 1, a chain for transmitting driving force to the wheels is arranged between the pair of divided frames, and the fixing portion is arranged at a position off the track of the chain. It is characterized by being.

The invention according to claim 3, in addition to the second aspect, at least one of the pair of divided frames, and having a boss portion formed in the vehicle body inner side.

The invention according to claim 4 is characterized in that, in addition to the configuration of claim 3 , the boss part is provided on an extension line of the fixing part for coupling the pair of divided frames.

According to the present invention, the fixed portion to couple the pair of frame segments with bolts and nuts are provided in the vicinity of the suspension arm support portions, bolt and nut, inside with than the outer periphery of the pair of left and right divided frames since fixed, it is possible to reliably fix the pair of divided frames, also bolts and nuts, because they do not protrude from the outer surface of the divided frames, it is possible to improve the appearance of the straddle-type vehicle, also Since at least one of the fixed parts is covered with the suspension arm support part, the appearance of the saddle riding type vehicle can be further improved , and the rigidity of the suspension arm support part can be improved by the fixed part provided in the vicinity. Can be improved.

According to the second aspect of the present invention, since the fixing portion is disposed at a position off the track of the chain that transmits the driving force to the wheels, it is possible to prevent the fixing portion from interfering with the chain.

According to the invention of claim 3 , since at least one of the pair of divided frames has a boss portion formed inside the vehicle body, the periphery of the chain is not completely covered, the maintainability can be improved, and The rigidity of the pair of divided frames can be ensured.

According to the invention of claim 4 , since the boss portion is provided on the extension line of the fixing portion for joining the pair of divided frames, the internal structure of the pair of divided frames is simplified and completely covers the periphery of the chain. Therefore, the maintainability can be improved, and the rigidity of the pair of divided frames can be ensured.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, drawing shall be seen in the direction of a code | symbol, about the left-right symmetric part, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 1 is a left side view of a saddle riding type vehicle according to the present invention, and FIG. 2 is a top view showing a body frame. The saddle riding type vehicle 10 is a four-wheel vehicle for running on rough terrain, and a steering shaft 13 for steering the left and right front wheels 12 is attached to the front part of the body frame 11, and the engine 14 and the center part of the body frame 11 are attached. A vehicle is provided with a power unit 16 including a transmission 15 and provided with a driving force transmission portion 18 for transmitting driving force to the left and right rear wheels 17 at the rear portion of the vehicle body frame 11.

  Here, reference numeral 21 is a battery, 22 is a radiator evening, 23 and 24 are radiator hoses connected to the radiator 22 and the engine 14, 25 is a crankcase, 26 is a cylinder block, 27 is a cylinder head, 28 is a head cover, 29 Is a crankshaft, 30 is a reduction gear unit provided in the transmission 15, 31 is a shift pedal for shifting operation, 32 is an output shaft of the reduction gear unit 30, 33 is a drive sprocket attached to the output shaft 32, and 34 is a drive sprocket. 33, a chain hung on 33, 35 an air cleaner connected to the cylinder head 27 via a connecting tube 36, 37 an exhaust pipe extending rearward from the cylinder head 27, 38 a muffler connected to the rear end of the exhaust pipe 37, 39 Is a front cushion that absorbs the impact of the left and right front wheels 12 from the ground. Is Yon'yunitto.

  As shown in FIGS. 1 and 2, the vehicle body frame 11 includes a pair of left and right front upper frames 51 bent in a mountain shape, a pair of left and right front middle frames 52 connected to the front ends of these front upper frames 51, and A pair of left and right front first inclined frames 53 inclined to the rear end of the front middle frame 52 and the front of the front upper frame 51, and a pair of left and right extending substantially horizontally rearward from the rear end of the front upper frame 51. A rear upper frame 54, a rear first inclined frame 55 that extends rearward and downward from a rear end portion of the front upper frame 51, a seat rail 56 that is coupled to an intermediate portion and a rear end of the rear upper frame 54, Is provided.

  In addition, the vehicle body frame 11 has a pair of left and right front lower first frames 57 inclined downward from the rear end of the front middle frame 52, a lower end of the front lower first frame 57, and a lower end of the rear first inclined frame 55. A pair of left and right lower frames 58 extending forward and backward by connecting, a pair of left and right front lower frames 59 passed to the front middle frame 52 and the front part of the lower frame 58, a rear end of the lower frame 58 and a rear upper A pair of left and right rear second inclined frames 60 passed to the rear end of the frame 54. Further, the vehicle body frame 11 is a connecting frame that connects a pair of left and right joint members 61 that are a joint portion that joins the rear end of the front upper frame 51, the front end of the rear upper frame 54, and the upper end of the rear first inclined frame 55. 62 (see FIG. 2) and the vicinity of the connection between the rear end of the rear upper frame 54 and the upper end of the rear second inclined frame 60, the rear end of the rear first inclined frame 55, the rear end of the lower frame 58, and the rear A pair of left and right support frames 63 supported in the vicinity of the connection point with the lower end of the second inclined frame 60. Reference numeral 64 denotes a front guard member attached to the front end of the front middle frame 52 and the front end of the lower frame 58, respectively.

  Each front upper frame 51 has a first bracket 71 that supports the power unit 16. The front middle frame 52 includes upper arm support portions 72 and 73 for attaching upper arms (not shown) for supporting the left and right front wheels 12 so as to freely swing up and down. The front lower first frame 57 includes a second bracket 74 that supports the power unit 16.

  The lower frame 58 is provided with lower arm support portions 75 and 76 for attaching lower arms (not shown) for supporting the left and right front wheels 12 to the front portion so as to freely swing up and down, and a steering shaft lower support member for supporting the lower portion of the steering shaft 13. 77. Further, the lower frame 58 includes a third bracket 78 and a fourth bracket 79 that support the power unit 16 at an intermediate portion. Further, the connection frame 62 includes a fifth bracket 80 that supports the power unit 16.

  A pair of left and right reinforcing frames 81 are connected in the vicinity of the connecting portion between the rear end of the lower frame 58 and the rear end of the rear first inclined frame 55. Also, a pair of left and right steps 82 are fixed to the lower frame 58 in the vicinity of the connection point with the reinforcing frame 81 and extend outward in the vehicle body width direction so that the driver places his / her feet during driving. Further, a pair of left and right reinforcing plates 83 are fixed at the corners at the connection point between the rear end of the rear first inclined frame 55 and the lower end of the rear second inclined frame 60.

  A pair of left and right support frames 63 are provided with a final gear case 201 that rotatably supports a driven sprocket 200 on which the chain 34 is stretched, and suspension arms 103 including upper arms 101 and lower arms 102 are swingable on both side surfaces thereof. It is connected to.

  FIG. 3 is a top view illustrating the structure of the support frame, and FIG. 4 is a plan view illustrating the structure of the support frame. As shown in FIG. 3, the pair of left and right support frames 63 are divided frames that are joined to each other and are integrally formed by casting. On the front side of these support frames 63, there are a vicinity of the connecting portion between the rear end of the rear upper frame 54 and the upper end of the rear second inclined frame 60, and the rear end of the lower frame 58 and the lower end of the rear second inclined frame 60. Positioning bosses 131 which are boss portions attached in the vicinity of the connecting portions are formed in the vehicle body in the opposite positions to each other, and the support frames 63 are positioned by abutting these positioning bosses 131.

  Further, as shown in FIGS. 3 and 4, each support frame 63 has four fixed bosses 132 a, 132 b, 132 c, and 132 d that are fixed portions and boss portions protruding from the facing surfaces of each support frame 63. The end surfaces of the fixed bosses 132a, 132b, 132c, and 132d are brought into contact with each other by abutting the support frames 63 with each other.

  FIG. 5 is a cross-sectional view for explaining the joining structure of the support frame at the position of the fixed boss 132a. Since the joint structure at the positions of the fixed bosses 132a, 132b, 132c, and 132d is the same, only the joint structure at the position of the fixed boss 132a will be described.

  The fixed boss 132a protrudes from the inner surface side of the support frame 63, and a bolt insertion hole 133 is formed at the center thereof. Further, a counterbore 134 is formed on the outer surface of the support frame 63 at a position where the bolt insertion hole 133 is formed.

  The pair of support frames 63 are brought into contact with each other so that the end faces of the fixed bosses 132a are brought into contact with each other, and the bolts 131 are connected to the bolt insertion holes 133 from one side. By inserting and screwing the nut 136 to the connecting bolt 135 on the other side, the support frames 63 are fastened and fixed. The connecting bolt 135 has a length substantially equal to or slightly shorter than the distance between the outer surfaces of the support frame 63 fastened to each other, and the head 135 a and the nut 136 of the connecting bolt 135 are connected to the outer surface of the support frame 63. Without being protruded from it, it is arranged and accommodated in the counterbore part 134.

  As shown in FIG. 4, the front side of the final gear case 201 is supported by the support frame 63 via the case support bracket 205. The final gear case 201 has an adjustment screw hole 206 formed on the rear side thereof, and an adjustment screw 208 inserted through the insertion hole 207 at the rear end of the support frame 63 is screwed into the adjustment screw hole 206. It is. Then, by adjusting the screwing amount of the adjusting screw 208 into the adjusting screw hole 206, the mounting position of the final gear case 201 in the front-rear direction is adjusted, and the tension of the chain 34 spanned on the driven sprocket 200 is adjusted. .

  Further, the upper arm 101 and the lower arm 102 attached to the support frame 63 have their front ends connected to a hub 204 (see FIG. 6) of the rear wheel 17 described later, and the suspension arm 103 is a double wishbone type. An independent suspension structure is constructed. As shown in FIG. 3, the upper arm 101 includes an upper first arm portion 105 that extends obliquely backward with respect to the support frame 63, an upper second arm portion 106 that extends substantially at right angles to the support frame 63, and an upper A connecting portion 107 that connects the first arm portion 105 and the upper second arm portion 106 is provided. The lower arm 102 also includes a lower first arm portion 108 that extends obliquely rearward with respect to the support frame 63, a lower second arm portion 109 that extends substantially at right angles to the support frame 63, and a lower first arm portion 108. And a lower second arm portion 109 (see FIG. 8).

  As shown in FIG. 4, the upper arm 101 and the lower arm 102, that is, the cylindrical mounting portion 105 a of the upper first arm portion 105 and the cylindrical mounting portion of the upper second arm portion 106 are provided on the outer surface of the support frame 63. 106a, four suspension arm support portions (hereinafter referred to as arm support portions) 137a for connecting the cylindrical mounting portion 108a of the lower first arm portion 108 and the cylindrical mounting portion 109a of the lower second arm portion 109. 137b, 137c, and 137d are provided. In addition, since the attachment structure of the suspension arm in arm support part 137a, 137b, 137c, 137d is the same, only the attachment structure in arm support part 137a is demonstrated.

  The arm support portion 137a includes a substantially U-shaped support wall 138 raised from the surface of the support frame 63, and support bolts 139 are inserted into the mounting wall portions 138a of the support wall 138 facing each other. A hole 138b is formed. Between the mounting wall portions 138a, the mounting portion 105a of the upper first arm portion 105, the outer ring 141 fixed to the inner peripheral surface of the mounting portion 105a by the retaining rings 140, 140, and the concave spherical surface provided on the outer ring 141 An inner ring 142 in which a convex spherical surface is slidably fitted, collars 143 and 143 applied to both end faces of the inner ring 142, and a seal member interposed between the collars 143 and 143 and the mounting portion 105a. 144, 144 are arranged.

  Then, the support bolt 139 is inserted into the mounting wall portion 138a, the collar 143, the inner ring 142, the collar 143, and the mounting wall portion 138a in this order from the front of the vehicle, and the nut 145 is screwed into the tip of the support bolt 139 to The first arm portion 105 is attached to the arm support portion 137a so as to be swingable in the vertical direction.

  Here, the four arm support portions 137a, 137b, 137c, and 137d are provided in the vicinity of the fixed bosses 132a, 132b, 132c, and 132d that join the support frames 63 with high rigidity, respectively. In particular, the arm support portions 137a and 137b of the upper arm 101 coincide with the fixed bosses 132a and 132b of the support frames 63 in a side view so that the connecting bolt 135 and the nut 136 provided on the fixed bosses 132a and 132b cannot be seen from the outside. It is arranged at the position.

  On the other hand, the arm support portions 137c and 137d of the lower arm 102 are positioned in the vicinity of the track of the chain 34 in plan view, and are positioned to partially interfere with the track of the chain 34. For this reason, the lower fixed bosses 132c and 132d arranged in the vicinity of the arm support portions 137c and 137d are arranged at positions where they do not interfere with the chain 34 off the chain track.

  As shown in FIGS. 4 and 6, the driving force transmission portion 18 supports the chain 34 spanned between the drive sprocket 33 and the driven sprocket 200 and the driven sprocket 200 so as to be rotatable, and a pair of left and right support frames. A final gear case 201 supported between the left and right drive shafts 203, one end of which is supported by the final gear case 201 via a bearing portion 202, and a hub 204 connected to the distal ends of these drive shafts 203, The rear wheel 17 is attached to the hub 204.

  The drive shaft 203 includes a swingable constant velocity joint 210 connected to the bearing portion 202 side and capable of expanding and contracting in the axial direction, a swingable fixed velocity constant joint 211 connected to the hub 204 side, And a shaft 212 provided between the constant velocity joints 210 and 211.

  The constant velocity joint 211 includes an outer ring 222 integrally formed on the axle 221 of the rear wheel 17, an inner ring 223 splined to one end of the shaft 212, and a plurality of ball grooves and inner rings 223 provided on the inner peripheral surface of the outer ring 222. It consists of a plurality of balls 224 movably arranged in a plurality of ball grooves provided on the outer peripheral surface, and a cage 225 for holding these balls 224.

  Further, the tip portions of the upper arm 101 and the lower arm 102 are connected to a knuckle arm 232 constituting the hub 204 by connecting portions 230 and 231, and the constant velocity joint 211 is connected to a knuckle arm 232 constituting the hub 204 with a bearing 233. It is supported rotatably via Reference numeral 234 denotes a retaining ring for fixing the bearing 233, and 235 denotes a seal member.

  As shown in FIG. 7, the bearing portion 202 supported by the final gear case 201 includes a bearing 251 fitted to the inner peripheral surface of the fitting hole 201 a of the final gear case 201, and the fitting hole 201 a and the constant velocity joint 210. And a seal member 252 interposed therebetween.

  The constant velocity joint 210 includes an outer ring housing 253, an inner ring 254 splined to the other end of the shaft 212, a plurality of ball grooves provided on the inner peripheral surface of the housing 253, and a plurality of outer grooves provided on the outer peripheral surface of the inner ring 254. It consists of a plurality of balls 255 movably arranged in the ball grooves and a cage 256 that holds these balls 255.

  The housing 253 has a bottomed cylindrical member in which the outer peripheral surface is fitted to the bearing 251 and the bearing 251 is prevented from coming off by the retaining ring 258, and the male spline 259 is formed on the outer peripheral surface of the small diameter portion 253a formed at one end. It is. Reference numeral 253b denotes a bottom surface of the housing 253.

  The housings 253 are attached to the final gear case 201 in close proximity to each other, and the female splines 200a of the driven sprocket 200 are spline-coupled to the male splines 259 of the housings 253, respectively.

  FIG. 8 is a perspective view of the main part showing the support structure on the left rear wheel side attached to the vehicle body frame, and FIG. 9 is a top view showing the support structure on the rear wheel side. As shown in FIGS. 8 and 9, a link member 112, a cushion unit 113, and a push rod 114 are swingably disposed between the vehicle body frame 11 and the suspension arm 103.

  A link attachment portion 111 is provided at a connection portion between the rear end of the lower frame 58 and the lower end of the rear second inclined frame 60, and the link member 112 faces the vehicle body frame toward the rear of the link attachment portion 111. 11 is connected obliquely so as to be separated from the vehicle body width direction. The link member 112 is formed in a substantially triangular shape in plan view, and pivotally connects the first top portion 112a located at the front to the link mounting portion 111 and cushions the second top portion 112b located above the intermediate portion. A third top portion 112c positioned rearward is connected to the unit 113 at the lower end of the push rod 114, and a bottom portion 112d positioned further below the intermediate portion is rotatably connected to one end of the connecting rod 116 of the stabilizer 115.

  The cushion unit 113 is disposed so that the axis thereof is substantially parallel to the link member 112, and the front upper frame 51, the rear upper frame 54, the rear first inclined frame 55, and the connecting frame 62 are connected to each other. It is connected with the cushion support part 61a of the joint member 61 which is these so that rotation is possible. The cushion support portion 61a of the joint member 61 is located on the inner side of the vehicle body frame 11 and on the inner side of the step 82 in the vehicle body width direction.

  Therefore, in the cushion unit 113, the first end portion 113a supported by the cushion support portion 61a of the vehicle body frame 11 at one end is located on the inner side in the vehicle body width direction of the vehicle body frame 11, and the link member 112 on the suspension arm side. The second end 113b supported by the vehicle body 11 is located outside the vehicle body frame 11 in the vehicle width direction. In addition, the cushion unit 113 is arranged such that the first end 113a and the second end 113b are shifted in the vehicle longitudinal direction so that the axis of the cushion unit 113 intersects the vehicle body frame 11 and extends in the vehicle longitudinal direction. Thereby, the stroke length of the cushion unit 113 can be taken reasonably long, and the impact from the rear wheel 17 transmitted through the suspension arm 103, the push rod 114, and the link member 112 is reliably absorbed.

  Further, the first top portion 112a of the link member 112 connected to the link attachment portion 111 is positioned rearward of the first end portion 113a of the cushion unit 113 supported by the joint member 61. The top portion 112a is made closer to the second end portion 113b of the cushion unit 113, and the swing radius of the link member 112 due to the stroke of the cushion unit 113 is made smaller.

  The push rod 114 connected to the third top portion 112c of the link member 112 is disposed so that the axis thereof is substantially parallel to the link member 112, and the upper end of the push rod 114 is swingable to the upper arm 102 via the ball joint 118. Connected. Therefore, the link member 112 swings around the link attachment portion 111 according to the stroke of the cushion unit 113, and the swing direction is different from the swing directions of the upper arm 101 and the lower arm 102 and is substantially orthogonal.

  The ball joint 118 is attached to an intermediate portion of the upper first arm portion 105 at an escape portion 105b formed by bending so as to avoid interference with the cushion unit 113 and the link member 112. A relief portion 108b is also formed in the middle portion of the lower first arm portion 108 in the same manner.

  As shown in FIGS. 10A and 10B, the ball joint 118 is fixed to the upper arm 101 and is fixed to the housing 119 having a storage hole 119a and the tip of the push rod 114. A ball portion 120 disposed in the hole 119a and a plug 121 having a bearing portion 121a provided in an opening on the upper side of the housing 119 and slidably in contact with the ball portion 120 are provided. Thereby, the ball part 120 is slidably held in the housing hole 119 a of the housing 119, and the push rod 114 is swingable with respect to the upper arm 101. A resin boot 122 is attached to the housing 119 to cover an opening formed on the lower side thereof. The boot 122 allows the push rod 114 to swing while allowing dust to enter the housing 119. Prevent the intrusion of water and water.

The stabilizer 115 in which one end of the connecting rod 116 is connected to the bottom of the intermediate portion of the link member 112 includes the pair of left and right connecting rods 116 and a stabilizer body 123 that connects the other ends of the connecting rods 116. An intermediate portion of the stabilizer main body 123 is held by a pair of left and right reinforcing plates 83 via a support bracket 124, and is formed from a front upper frame 51, a cushion unit 113, and a link member 112 constituting the vehicle body frame 11. Is inserted into the space portion 125 to be inserted. Further, both ends of the stabilizer body 123 protruding from the pair of reinforcing plates 83 are bent rearward and extend substantially parallel to the link member 112, and are connected to the other ends of the pair of left and right connecting rods 116.

  In the straddle-type vehicle 10 having the above structure, when the rear wheel 17 receives an impact from the ground during traveling, the suspension arm 103 that supports the rear wheel 17 swings, and the push rod 114 connected by the ball joint 118 is moved. Through this, the link member 112 swings. Therefore, the impact of the rear wheel 17 is transmitted to the cushion unit 113 connected to the link member 112 and the vehicle body frame 11 and disposed along the front-rear direction of the vehicle body, and is reliably absorbed by the cushion unit 113. Thereby, the transmission of the impact from the rear wheel 17 to the vehicle body frame 11 is greatly suppressed, and a good riding comfort of the vehicle 10 is ensured.

  As described above, according to the vehicle cushion mounting structure used in the saddle riding type vehicle 10 according to the above embodiment, the fixed bosses 132a, 132b, 132c, 132d for coupling the pair of support frames 63 are provided. The fixed bosses 132a, 132b, 132c, and 132d are provided inside the pair of support frames 63, because they are provided inside the outer periphery of the pair of support frames 63 and in the vicinity of the suspension arm support portions 137a, 137b, 137c, and 137d. The pair of support frames 63 can be reliably fixed to each other, and the fixed bosses 132a, 132b, 132c, and 132d are hidden by the suspension arm 103, so that the appearance of the saddle riding type vehicle 10 is improved. Can be improved. Further, the rigidity of the suspension arm support portions 137a, 137b, 137c, 137d can be improved by the fixed bosses 132a, 132b, 132c, 132d provided in the vicinity.

  Further, since the fixed bosses 132a and 132b for coupling the pair of support frames 63 are covered with the suspension arm support portions 137a and 137b, the appearance of the saddle riding type vehicle 10 can be improved, and the suspension arm The rigidity of the support portions 137a and 137b can be improved. It should be noted that at least one of the fixed bosses 132a, 132b, 132c, and 132d for coupling the pair of support frames 63 may be covered with another member. Can be improved.

  Further, the connecting bolt 135 and the nut 136 that couple the pair of support frames 63 with the fixing bosses 132a, 132b, 132c, and 132d are arranged so as not to protrude from the outer surface of the support frame 63. The appearance can be further improved.

  Further, since the fixed bosses 132a, 132b, 132c, 132d are arranged at positions deviating from the track of the chain 34 that transmits the driving force to the wheels 17, the fixed bosses 132a, 132b, 132c, 132d interfere with the chain 34. This can be prevented.

  In addition, since at least one of the pair of support frames 63 includes the positioning boss 131 and the fixed bosses 132a, 132b, 132c, and 132d that are formed inside the vehicle body, the periphery of the chain 34 is not completely covered, and maintenance is easy. And the rigidity of the pair of support frames 63 can be ensured.

  Furthermore, in the present embodiment, fixed bosses 132a, 132b, 132c, and 132d are used as the fixed portion and the boss portion, and the boss portion formed inside the vehicle body is a fixed portion for connecting a pair of divided frames. Therefore, the internal structure of the pair of support frames 63 is simplified, the chain 34 is not completely covered, the maintainability can be improved, and the rigidity of the pair of support frames 63 is ensured. be able to.

1 is a side view of a straddle-type vehicle to which a vehicle cushion mounting structure of the present invention is applied. It is a top view which shows the vehicle body frame of the saddle riding type vehicle of this invention. It is a top view explaining the structure of a support frame. It is a side view explaining the structure of a support frame. It is sectional drawing explaining the joining structure of a support frame. It is sectional drawing which shows the structure of a driving force transmission system. It is sectional drawing which shows the structure of the principal part of a driving force transmission system. It is a principal part perspective view which shows the support structure by the side of the left rear wheel attached to a vehicle body frame. It is a top view which shows the support structure by the side of a rear wheel. It is the top view and sectional drawing explaining the structure of a ball joint.

Explanation of symbols

10 Saddle type vehicle 17 Rear wheel (wheel)
34 Chain 63 Support frame (split frame)
103 Suspension arm 131 Positioning boss (boss part)
132a, 132b, 132c, 132d Fixed boss (fixed part, boss part)
135 Connecting bolt (bolt)
136 Nut 137a, 137b, 137c, 137d Suspension arm support

Claims (4)

A straddle-type vehicle frame structure,
Comprising a pair of left and right divided frames that will be bonded against each other,
The outer surface of the pair of divided frames includes a plurality of suspension arm support portions for supporting a suspension arm for suspending a wheel, and includes a plurality of fixing portions for coupling the pair of divided frames .
The fixing portion is provided in the vicinity of the suspension arm support portion and is coupled by a bolt and a nut, and the bolt and the nut do not protrude from the outer surface inside the outer periphery of the pair of left and right divided frames . It is arranged in a spot facing formed on the outer surface of the divided frame,
The straddle-type vehicle frame structure , wherein at least one of the fixed portions is covered with the suspension arm support portion .   2. The scissors according to claim 1, wherein a chain that transmits a driving force to the wheels is disposed between the pair of divided frames, and the fixing portion is disposed at a position off the track of the chain. Frame structure for riding type vehicles. 3. The straddle-type vehicle frame structure according to claim 2 , wherein at least one of the pair of divided frames has a boss portion formed inside the vehicle body. The straddle-type vehicle frame structure according to claim 3 , wherein the boss portion is provided on an extension line of a fixing portion for joining the pair of divided frames.

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