JP5973924B2 - Seat rail structure for saddle riding type vehicles - Google Patents

Description

  The present invention relates to a seat rail structure for a saddle-ride type vehicle.

  Patent Document 1 discloses a motorcycle including a vehicle body frame including a pair of left and right seat rails at the rear, and a cross member (bridge plate 3) joined to the rear of the left and right seat rails.

  In the motorcycle, the cross member is formed in a U-shaped cross section, and has an upper wall and left and right side walls extending downward from the left and right of the upper wall. The left and right side walls of the cross member extend downward along the vertical direction, and the lower ends of the left and right side walls are in contact with and joined (welded) to the upper surface of the seat rail.

JP-A-5-246361

  By the way, in this type of motorcycle, it is desired to change the performance while sharing parts by using the left and right seat rails and increasing the strength and rigidity of the cross member as necessary. There is a case. Here, for example, in a seat rail as in the prior art, it is conceivable to increase the thickness of the cross member.

  However, when the thickness of the cross member is increased to ensure strength and rigidity, the weight of the seat rail increases, and the machine for processing the cross member becomes large (large scale).

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a seat rail structure for a straddle-type vehicle that can easily ensure the strength and rigidity of a cross member.

  As a means for solving the above-mentioned problems, the invention according to claim 1 is formed by bending a body frame (10) having a pair of left and right seat rails (15L, 15R) extending in the front-rear direction at a rear portion and a plate-like member. And a cross rail (45) for connecting the left and right seat rails (15L, 15R), the cross member (45) includes an upper wall (50) and an upper wall (50). A standing wall (51) formed on at least the front part and the left and right side parts of the wall (50) and extending downward, the standing wall (51) in the front-rear direction along the left and right seat rails (15L, 15R) A left side wall (52L) and a right side wall (52R) extending to the left side wall (52L) and a front wall (53) connecting the right side wall (52R), the left side wall (52L) and the right side wall Wall (52 ) Are joined to the seat rails (15L, 15R), and the left side wall (52L) and the right side wall (52R) have their front portions directed forward. And extending inward in the vehicle body width direction so as to form a smooth continuous surface with the front wall (53), and the front end of the joint is more seat rail (50) than the front end of the upper wall (50). 15L, 15R) in the extending direction.

  According to a second aspect of the present invention, in the seat rail structure of the saddle riding type vehicle according to the first aspect, the lower portions of the left side wall (52L) and the right side wall (52R) are the seat rails (15L, 15R). The joint portion is formed so as to expand outward in the vehicle width direction as it goes downward, and the joint portion extends in the vertical direction in the region on the outer half side in the vehicle width direction of the seat rail (15L, 15R). It is arranged in the center.

  According to a third aspect of the present invention, in the seat rail structure of the saddle riding type vehicle according to the first or second aspect, left and right front corners (50L, 50R) of the upper wall (50) are formed in an arc shape. It is characterized by that.

  According to a fourth aspect of the present invention, in the seat rail structure of the saddle riding type vehicle according to any one of the first to third aspects, the seat lock mechanism (63) or the antitheft device (66) It is arranged between the seat rails (15L, 15R), covers the left and right seat rails (15L, 15R) from the outside in the vehicle width direction, and its inner end is the left side wall (52L) of the cross member (45) And a pair of left and right rear cowls (38L, 38R) arranged to extend in the front-rear direction along the left side wall (52L) and the right side wall (52R) in the vicinity of the right side wall (52R). It is characterized by being able to.

  According to a fifth aspect of the present invention, in the seat rail structure of the saddle riding type vehicle according to any one of the first to fourth aspects, the front wall (53) is directed outward from a vehicle width direction center. It is characterized by a large downward extension.

  According to the first aspect of the present invention, by connecting the left side wall and the right side wall of the cross member with the front wall, the strength and rigidity of the cross member can be easily ensured without increasing the thickness of the cross member. . In addition, by extending the front end of the joint portion of the left side wall and the right side wall in the seat rail extending direction from the front end of the upper wall, the distance between the joint portions is secured, and the cross member and the seat rail can be easily obtained. Bonding with is good.

  According to the second aspect of the present invention, the load applied to the upper wall is received by the seat rail so that the left and right side walls and the seat rail are brought into direct contact with each other, and the load applied to the joint portion is reduced.

  According to invention of Claim 3, an upper wall, a front wall, a left side wall, and a right side wall are connected smoothly.

  According to the invention described in claim 4, by arranging the rear cowl and the cross member close to each other, the gap between the rear cowl and the cross member can be reduced while preventing the rubbing and noise between the rear cowl and the cross member. Further, mischief to the seat lock mechanism and the anti-theft device arranged in the seat rail is prevented.

  According to the fifth aspect of the present invention, the space below the cross member, in other words, the space between the cross member and the seat rail can be effectively utilized.

1 is a left side view of a motorcycle to which a structure according to an embodiment of the present invention is applied. Fig. 3 is a left side view of the rear part of the motorcycle. Fig. 2 is a top view of the rear part of the motorcycle. It is the perspective view which looked at the rear part of the above-mentioned motorcycle from the front upper part. It is a front view of the cross member welded to the seat rail of the motorcycle. It is sectional drawing which follows the AA line of FIG. It is a principal part enlarged view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used for the following description, the arrow FR indicates the front of the vehicle, the arrow UP indicates the upper side of the vehicle, and the arrow LH indicates the left side of the vehicle.

  A vehicle body frame 10 of a motorcycle 1 as a saddle-ride type vehicle shown in FIG. 1 extends from a head pipe 11 constituting a front end and obliquely rearward and downward from an upper part of the head pipe 11, and then curves downward at a different angle. Main frame 12, a down frame 13 extending obliquely downward and rearward from the lower portion of the head pipe 11, a pivot plate 14 extending downward from the lower portion of the main frame 12, and extending rearward from the vicinity of the curved portion of the main frame 12. A pair of left and right seat rails 15L and 15R, and a pair of left and right rear frames 16L and 16R that extend obliquely rearward and upward from the lower portion of the main frame 12 and are connected to the front-rear intermediate portion of the seat rails 15L and 15R. ing.

  A region extending below the main frame 12, the seat rails 15L and 15R, and the region surrounded by the rear frames 16L and 16R has a triangular shape in a side view. Of the above members, members that do not appear in the drawing (for example, the seat rail 15R) are indicated by parentheses in the drawing for convenience of explanation. In the following description, members that do not appear in the drawings are handled in the same manner. Further, the seat rails 15L and 15R of the present embodiment are made of a pipe material having a circular cross section.

  A pair of left and right front forks 2L and 2R that support the front wheel 3 are attached to the head pipe 11 via a steering shaft (not shown) so as to be rotatable. A fuel tank 20 is supported on the upper portion of the main frame 12. ing. The upper portions of the front forks 2L and 2R are connected by a top bridge 4U and a bottom bridge 4D arranged below the top bridge 4U, and a bar handle 4H is attached to the top bridge 4U.

  A pivot shaft 18 is inserted into the pivot plate 14, and the swing arm 5 is supported on the pivot shaft 18 so as to freely swing up and down. The swing arm 5 is composed of a pair of left and right arm members 6L, 6R, and supports a rear wheel 7 rotatably at a rear end portion. A rear cushion 8 is provided between the front portion of the swing arm 5 and the curved portion of the main frame 12. The rear cushion 8 extends obliquely forward and upward from the front portion of the swing arm 5 and is connected to the main frame 12 via a bracket.

  Reference numeral 9 denotes a power transmission member (drive chain or the like). A seat 19 extending in the front-rear direction is supported on the upper portions of the seat rails 15L and 15R so as to be placed on the seat rails 15L and 15R.

  A power unit 30 including an internal combustion engine and a transmission is disposed below the main frame 12. The power unit 30 includes a crankcase 31 and a cylinder portion 32 that rises upward from the front portion of the crankcase 31. The cylinder portion 32 includes a cylinder block that slidably accommodates a piston in a cylinder bore formed therein, a cylinder head disposed on the upper portion of the cylinder block, and a head cover that covers the upper portion of the cylinder head.

  An air cleaner 33a is disposed at a position extending downward from the main frame 12, the seat rails 15L and 15R, and the rear frames 16L and 16R, as viewed from the side, and in a triangular shape as viewed from the side. An intake air amount adjusting device 33 is disposed between the air cleaner 33 a and the cylinder portion 32.

  An exhaust pipe 35 is connected to the front wall of the cylinder part 32, and the exhaust pipe 35 is curved after extending downward from the front wall of the cylinder part 32, and extends rearward below the power unit 30. A silencer 35 a is connected to the rear end of the exhaust pipe 35.

  Below the fuel tank 20 and the seat 19, a region extending downward from the main frame 12, and a triangular area as viewed from the side surrounded by the seat rails 15 L and 15 R and the rear frames 16 L and 16 R are covered from the outside in the vehicle width direction. A pair of left and right side covers 36L, 36R are arranged. The side covers 36L and 36R are formed in a substantially triangular shape when viewed from the side with the corners facing downward, and are arranged so as to extend the upper edge at a position facing the corners facing downward along the front-rear direction. ing. Further, the side covers 36L and 36R extend along the rear frames 16L and 16R at the edge portions extending obliquely rearward and upward from the corners facing downward to cover the rear frames 16L and 16R from the outside in the vehicle body width direction. Yes.

  A pair of left and right rear outer cowls 37L and 37R and rear inner cowls 38L and 38R are disposed behind the side covers 36L and 36R to cover the rear portions of the seat rails 15L and 15R from the outside in the vehicle width direction. Referring also to FIG. 3, the rear inner cowls 38L, 38R are disposed inwardly of the rear outer cowls 37L, 37R in the vehicle width direction. The rear outer cowls 37L, 37R are connected to the rear portions of the side covers 36L, 36R at the front portions and extend rearward. The rear inner cowls 38L and 38R are arranged such that their front portions are positioned inwardly in the vehicle width direction of the rear portions of the rear outer cowls 37L and 37R, and rear portions thereof are projected rearward from the rear portions of the rear outer cowls 37L and 37R. ing. In FIG. 3, dots are attached to the rear inner cowls 38L and 38R for convenience of explanation.

  A rear fender 39 is fixed to the rear portions of the seat rails 15L and 15R, and the rear fender 39 extends obliquely rearward and downward from between the left and right rear inner cowls 38L and 38R. A brake lamp 40 is fixed to the rear ends of the seat rails 15L and 15R. The brake lamp 40 is covered from the outside in the vehicle width direction by the rear portions of the rear inner cowls 38L and 38R, and is exposed rearward from between the rear portions of the rear inner cowls 38L and 38R.

  A grab rail 41 is fixed to the rear part of the seat rails 15L, 15R. The grab rail 41 is formed in a U shape when viewed from above, and both end portions thereof are rear portions of the seat rails 15L and 15R so as to protrude outward in the vehicle width direction from positions above the rear portions of the rear outer cowls 37L and 37R. It is fixed to. Reference numeral 42 denotes a seat lock release key cylinder. The seat lock release key cylinder 42 is disposed on the left side of the vehicle width direction center, and the key hole faces leftward.

  FIG. 2 shows the rear part of the vehicle body with the rear outer cowls 37L and 37R and the rear inner cowls 38L and 38R removed, which are joined (welded) to the rear parts of the left and right seat rails 15L and 15R, respectively. A cross member 45 is shown between the rails 15L and 15R to connect the rails 15L and 15R. The cross member 45 supports the rear portion of the sheet 19. The seat 19 includes a bottom plate 19A extending along the seat rails 15L and 15R, and a seat body 19B provided on the top of the bottom plate 19A.

  The bottom plate 19A is made of, for example, a synthetic resin material, and the seat body 19B has a structure in which cushioning properties such as urethane are filled to ensure cushioning. The bottom plate 19A is integrally formed with a plurality of sheet abutting portions protruding downward, and the sheet 19 is supported by abutting these sheet abutting portions on the seat rails 15L, 15R side.

  In FIG. 2, a pair of left and right central rail abutting portions 21L and 21R formed at a substantially center in the front-rear direction of the bottom plate 19A, and a center and a rear end in the front-rear direction of the bottom plate 19A among the plurality of seat abutting portions. A pair of left and right first rear rail abutting portions 22L and 22R formed at a position between and a pair of left and right second rear rail abutting portions 23L and 23R formed at the rear end of the bottom plate 19A, It is shown.

  The center rail contact portions 21L and 21R and the first rear rail contact portions 22L and 22R are formed in a rectangular parallelepiped shape, and the second rear rail contact portions 23L and 23R are plate-shaped, and It is formed in the shape in which the lightening that opens in the left-right direction is formed. Although not shown, a rail contact portion that contacts the front side of the seat rails 15L and 15R is formed on the front side of the bottom plate 19A.

  The seat rails 15L and 15R are provided with center support brackets 24L and 24R that are in contact with the center rail contact portions 21L and 21R from below, at the positions corresponding to the center rail contact portions 21L and 21R. Rear support brackets 25L and 25R are provided at corresponding positions. The cross member 45 abuts on the second rear rail abutting portions 23L and 23R and supports the load borne from the seat 19.

Further, in the bottom plate 19A, between the central rail contact portions 21L and 21R and the first rear rail contact portions 22L and 22R, at positions close to the first rear rail contact portions 22L and 22R. A pair of left and right hook portions 27L and 27R are provided. The hook portions 27L and 27R are formed in an L shape, one end is connected to the bottom plate 19A, and the other end is directed forward (the surface direction (extending direction) of the bottom plate 19A).
On the other hand, in the seat rails 15L and 15R, a pair of left and right rectangular frame-shaped hook locking portions 28L and 28R are formed at positions between the center support brackets 24L and 24R and the rear support brackets 25L and 25R. . The hook locking portions 28L and 28R are open in the front-rear direction, and the seat 19 is locked by receiving the hook portions 27L and 27R from the rear inside the frame portion.

  In FIG. 2, reference numeral 26 denotes a gusset plate that is joined across the seat rail 15L and the rear frame 16L. A seat lock release key cylinder 42 is fixed to the gusset plate 26.

  2 to 5, the cross member 45 of the present embodiment is formed by bending a metal plate-like member, and has a rectangular upper wall 50 whose longitudinal direction is along the vehicle body width direction, And a standing wall 51 that is integrally formed on the front portion and the left and right side portions of the wall 50 and extends downward. The standing wall 51 includes a left side wall 52L and a right side wall 52R that extend in the front-rear direction (extending direction of the seat rails 15L, 15R) along the left and right seat rails 15L, 15R, and front ends of the left side wall 52L and the right side wall 52R. And a front wall 53 connecting the two.

  In the present embodiment, a wall portion extending downward from the rear portion of the upper wall 50 is not formed, and the rear portion of the cross member 45 is opened rearward. Although not shown, a wiring or the like extending from the rear end of the bulb of the brake lamp 40 is passed through the open part of the rear part of the cross member 45 so as to be guided forward. Thereby, the maintenance of the brake lamp 40 is facilitated.

  As shown in FIGS. 2 and 5, in the cross member 45, lower ends 54 </ b> L and 54 </ b> R extending along the front-rear direction (the extending direction of the seat rails 15 </ b> L and 15 </ b> R) of the left side wall 52 </ b> L and the right side wall 52 </ b> R It is set as the junction part joined to 15L and 15R (welding).

  The left side wall 52L includes an upper side wall portion 55L that is substantially perpendicular to the surface direction of the upper wall 50 from the left side portion of the upper wall 50 and extends downward along a substantially vertical direction, and a vehicle body width direction outer side from the lower end of the upper side wall portion 55L. And a lower side wall portion 56L formed so as to expand in the direction. The right side wall 52R includes an upper side wall portion 55R that is substantially perpendicular to the surface direction of the upper wall 50 from the right side portion of the upper wall 50 and extends downward along a substantially vertical direction, and a vehicle body width from the lower end of the upper side wall portion 55R. And a lower side wall portion 56R formed so as to expand outward in the direction.

  The lower side wall portion 56L and the lower side wall portion 56R are formed in an arc shape along the outer peripheral surfaces of the seat rails 15L, 15R, and are spread outward in the vehicle body width direction toward the lower side. , 15R is in contact with the upper surface. The lower ends of the lower wall portion 56L and the lower wall portion 56R are the joint portions.

  4 and 5, the upper side wall portion 55L of the left side wall 52L and the upper side wall portion 55R of the right side wall 52R respectively extend inward in the vehicle body width direction as the front portions 55LF and 55RF move forward. The wall 53 is formed so as to form a gentle continuous surface. The front portions 55LF and 55RF are curved in an arc shape, and the front ends thereof extend to the inner ends of the seat rails 15L and 15R in the vehicle body width direction.

  The front part of the lower side wall part 56L and the front part of the lower side wall part 56R extending from the lower ends of the front parts 55LF and 55RF extend outward and forward in the vehicle body width direction (front side in the extending direction of the seat rails 15L and 15R). It is formed as follows. FIG. 6 is a cross section taken along the line A-A in FIG. 1, and shows the cross section when the front portions 55LF and 55RF are cut in the direction orthogonal to the extending direction of the seat rails 15L and 15R. Yes. FIG. 7 is an enlarged view of FIG.

  Since the front ends of the front portions 55LF and 55RF extend to the inner ends of the seat rails 15L and 15R in the vehicle width direction, as shown in FIGS. 6 and 7, the front and lower side wall portions 56R of the lower side wall portion 56L. The upper surfaces of the seat rails 15L and 15R located below the front part of the vehicle are covered with a wide part in the vehicle body width direction by the front part of the lower side wall part 56L and the front part of the lower side wall part 56R.

  In FIG. 6, L1 represents the central axis of the left seat rail 15L, Lr represents the central axis of the right seat rail 15R, C1 represents a straight line orthogonal to the central axis Ll and extending in the vertical direction, C2 indicates a straight line that is orthogonal to the central axis Lr and extends in the vertical direction.

  The shapes of the front portions 55LF and 55RF will be described in detail. As is apparent from FIG. 6, in the present embodiment, the front portions 55LF and 55RF do not extend along the straight lines C1 and C2, respectively. Is formed so as to extend inward in the vehicle width direction from the side of the upper wall 50 toward the lower side. For this reason, in this embodiment, as also referred to in FIG. 7, compared to the case where the front portions 55LF and 55RF extend along the vertical direction, the front side of the lower side wall portion 56L extending from the lower ends of the front portions 55LF and 55RF. And the front portion of the lower side wall portion 56R cover the upper surfaces of the seat rails 15L and 15R in a wide range and come into contact with the upper surfaces of the upper surfaces of the seat rails 15L and 15R.

  FIG. 7 shows the lower end 54L of the left side wall 52L, which is a joint, and this lower end 54L is arranged at the center in the vertical direction in the outer half direction of the left seat rail 15L in the vehicle body width direction. Are welded. In other words, the lower end 54L intersects the straight line C3 orthogonal to the central axis Ll of the seat rail 15L along the radial direction of the seat rail 15L in the outer half region of the left seat rail 15L in the vehicle width direction. It is arranged and welded.

  Referring to FIGS. 4 and 5, the front body of the lower side wall part 56 </ b> L and the front side of the lower side wall part 56 </ b> R extending from the inner ends of the front parts 55 </ b> LF and 55 </ b> RF in the vehicle width direction and extending from the lower ends of the front parts 55 </ b> LF and 55 </ b> RF. The front wall 53 that connects the inner ends in the width direction includes an upper wall portion 57U that extends substantially perpendicularly to the surface direction of the upper wall 50 from the front portion of the upper wall 50, and forward from the lower end of the upper wall portion 57U. And a lower side wall 57D formed so as to approach the seat rails 15L and 15R as it goes.

  The upper side wall portion 57U connects between inner ends of the upper side wall portion 55L and the upper side wall portion 55R in the vehicle width direction, and the lower side wall portion 57D is between the inner ends of the lower side wall portion 56L and the lower side wall portion 56R in the vehicle width direction. Are connected.

  As shown in FIG. 5, the front end of the lower wall portion 57D is formed in an arc shape that is convex upward in a front view of the cross member 45, and the front wall 53 extends downward from the center in the vehicle width direction. It is formed so that the protrusion is large. The upper side wall portion 57U is formed so that its height in the vertical direction gradually decreases from the outside in the vehicle body width direction toward the center, and the lower end has an arc shape with a convex upward.

  3 and 4, as described above, the front portion 55LF of the left side wall 52L and the 55RF of the right side wall 52R are formed in an arc shape, so that the left and right front corner portions 50L, 50R of the upper wall 50 are in an arc shape. Is formed. A recess 60 is formed at the center of the upper wall 50 in the front-side vehicle body width direction, the recess 60 opens forward, and a front wall 53 extends downward from the front end of the recess 60. Here, referring to FIG. 2, the front ends of the lower end 54L of the left side wall 52L and the lower end 54R of the right side wall 52R of the cross member 45, that is, the front end of the joint portion, respectively, of the seat rails 15L, 15R are more than the front end of the upper wall 50. It is arranged forward (in the longitudinal direction of the vehicle body) in the extending direction.

  A slit hole 61 extending in the front-rear direction is formed in the recess 60 so as to penetrate therethrough. With reference to FIG. 6, the slit hole 61 allows a striker 62 provided on the bottom plate 19 </ b> A of the sheet 19 to be inserted. Below the upper wall 50 of the cross member 45, a latch 63, which is a seat lock mechanism for locking the striker 62, is provided. The latch 63 is fixed to the inner surface of the upper wall 50, and a cable 64 extends from the latch 63 toward the left. As shown in FIG. 2, the cable 64 is pulled out from a through hole 65 formed in the left side wall 52 </ b> L and connected to the seat lock release key cylinder 42.

When the key is inserted into the seat lock release key cylinder 42 and operated, the cable 64 operates the latch 63, and the latched state of the latch 63 and the striker 62 is released, so that the seat 19 is unlocked. The
Note that the latch 63 is covered from the front and left and right by the cross member 45 so as not to be exposed to the outside.

  A plurality of bolt fastening holes 59 for fixing the grab rail 41 are formed on the left and right sides of the recess 60 in the upper wall 50. As shown in FIG. 6, a fastening member such as a bolt is inserted into the bolt fastening hole 59, and the grab rail 41 is fixed to the cross member 45.

  FIG. 6 shows an antitheft device 66 disposed below the latch 63. Referring also to FIG. 3, an encircling rib 67 that protrudes upward and forms a rectangular storage space is formed on the upper portion of the rear fender 39, and the encircling rib 67 extends upward in a space below the cross member 45. Protrusively extends. The anti-theft device 66 is accommodated in the surrounding rib 67. The anti-theft device 66 is a GPS device, for example, but is not limited thereto. The latch 63 and the antitheft device 66 are disposed between the seat rails 15L and 15R.

  Here, FIG. 6 shows a cross section of the rear inner cowl 38L, 38R. The rear inner cowl 38L has an inner end of an upper wall portion extending in the vehicle body width direction close to the left side wall 52L of the cross member 45 on the left side. It arrange | positions so that it may extend in the front-back direction along the wall 52L, and covers the cross member 45 grade | etc., In the site | part extended below from the outer end of the said upper wall part. The rear inner cowl 38R has the same shape and arrangement. The rear inner cowl 38L also covers the cable 64 from the left.

  As described above, in the motorcycle 1, the cross member 45 that connects the left and right seat rails 15 </ b> L and 15 </ b> R is formed on the upper wall 50, the front portion and the left and right side portions of the upper wall 50 and extends downward. 51, and the standing wall 51 includes a left side wall 52L and a right side wall 52R extending in the front-rear direction along the left and right seat rails 15L, 15R, and a front wall 53 connecting the left side wall 52L and the right side wall 52R. Prepare. The lower ends (54L, 54R) of the left side wall 52L and the right side wall 52R are joined to the seat rails 15L, 15R, and each of the left side wall 52L and the right side wall 52R has a vehicle body as its front part moves forward. It is formed to extend inward in the width direction so as to form a smooth continuous surface with the front wall 53, and the front end of the joint portion (54 </ b> L, 54 </ b> R) extends from the front end of the upper wall 50 to the seat rails 15 </ b> L, 15 </ b> R. It is arranged forward (in the longitudinal direction of the vehicle body) in the present direction.

  In such a structure, by connecting the left side wall 52L and the right side wall 52R of the cross member 45 with the front wall 53, the strength and rigidity of the cross member 45 can be easily secured without increasing the thickness of the cross member 45. it can. Further, by extending the front end of the joint portion between the left side wall 52L and the right side wall 52R forward from the front end of the upper wall 50 in the extending direction of the seat rails 15L and 15R, the distance between the joint portions is ensured and simplified. In addition, the bonding between the cross member 45 and the seat rails 15L and 15R becomes good.

  Further, in the motorcycle 1, the lower portions of the left side wall 52L and the right side wall 52R are in contact with the upper surfaces of the seat rails 15L and 15R, and are formed so as to expand downward in the vehicle body width direction toward the lower side. The lower ends 54L and 54R are arranged at the center in the vertical direction in the region of the outer half of the seat rails 15L and 15R in the vehicle width direction.

  In such a structure, the load on the upper wall 50 is received by the seat rails 15L and 15R so that the left side wall 52L and the right side wall 52R are in direct contact with the seat rails 15L and 15R, and the load applied to the joint portion is reduced. Reduced.

  In the motorcycle 1, the left and right front corners 50L, 50R of the upper wall 50 of the cross member 45 are formed in an arc shape, so that the upper wall 50, the front wall 53, the left side wall 52L, and the right side wall 52R are gentle. Connected to

  In the motorcycle 1, the latch 63 and the anti-theft device 66, which are seat locking mechanisms, are disposed between the left and right seat rails 15L, 15R, and cover the left and right seat rails 15L, 15R from the outside in the vehicle width direction. A pair of left and right rear inner cowls 38L disposed so that the inner ends thereof extend in the front-rear direction along the left side wall 52L and the right side wall 52R in the vicinity of the left side wall 52L and the right side wall 52R of the cross member 45, 38R is provided.

  In such a structure, the rear inner cowls 38L, 38R and the cross member 45 are arranged close to each other, so that the rear inner cowls 38L, 38R and the cross member 45 are prevented from rubbing and sound, and the rear inner cowls 38L, 38R. The gap between the cross member 45 and the cross member 45 is reduced to prevent the latch 63 and the antitheft device 66 disposed in the seat rails 15L and 15R from being tampered with.

  In the motorcycle 1, the front wall 53 extends downward from the center in the vehicle width direction toward the outside. In this case, the space below the cross member 45, in other words, the space between the cross member 45 and the seat rails 15L and 15R can be effectively utilized.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, referring to FIG. 2, the hook engaging portions 28L and 28R may be provided close to the front wall 53 of the cross member 45 without providing the rear support brackets 25L and 25R in the seat rails 15L and 15R. . In this case, since the lower wall portion 57D of the front wall 53 extends while tilting forward and downward, the lower wall portion 57D can function as a guide portion that guides the hook portions 27L and 27R forward, and the seat 19 can be facilitated.

  Moreover, in the said embodiment, although the cross member 45 was provided in the rear-end part of seat rail 15L, 15R, you may provide the cross member 45 in parts other than the said rear-end part.

1 Motorcycle (saddle-ride type vehicle)
10 Body frame 15L, 15R Seat rail 38L, 38R Rear inner cowl (rear cowl)
45 Cross member 50 Upper wall 51 Standing wall 52L Left side wall 52R Right side wall 53 Front wall 54L Lower end (joining part)
54R Lower end (joint)
63 Latch (Seat lock mechanism)
66 Anti-theft device

Claims (5)

A body frame (10) having a pair of left and right seat rails (15L, 15R) extending in the front-rear direction at the rear, and a cross formed by bending a plate-like member and connecting the left and right seat rails (15L, 15R) In the seat rail structure of the saddle riding type vehicle comprising the member (45),
The cross member (45) includes an upper wall (50), and a standing wall (51) formed on at least the front and left and right sides of the upper wall (50) and extending downward.
The standing wall (51) includes a left side wall (52L) and a right side wall (52R) extending in the front-rear direction along the left and right seat rails (15L, 15R), and the left side wall (52L) and the right side wall (52R). ) And a front wall (53) for connecting,
The lower end (54L, 54R) of the left side wall (52L) and the right side wall (52R) is a joint part joined to the seat rail (15L, 15R),
Each of the left side wall (52L) and the right side wall (52R) is formed such that its front part extends inward in the vehicle body width direction as it goes forward to form a smooth continuous surface with the front wall (53). And
A seat rail structure for a saddle-ride type vehicle, wherein a front end of the joint portion is disposed in front of the front end of the upper wall (50) in the extending direction of the seat rail (15L, 15R). Lower portions of the left side wall (52L) and the right side wall (52R) are in contact with the upper surface of the seat rails (15L, 15R), and are formed so as to expand outward in the vehicle body width direction downward.
2. The seat rail of the saddle-ride type vehicle according to claim 1, wherein the joint portion is disposed at a center in an up-down direction in a region on an outer half side in a vehicle width direction of the seat rail (15 </ b> L, 15 </ b> R). Construction.   The seat rail structure for a saddle-ride type vehicle according to claim 1 or 2, wherein left and right front corners (50L, 50R) of the upper wall (50) are formed in an arc shape. A seat lock mechanism (63) or an anti-theft device (66) is disposed between the left and right seat rails (15L, 15R),
The left and right seat rails (15L, 15R) are covered from the outside in the vehicle width direction, and the inner ends thereof are adjacent to the left side wall (52L) and the right side wall (52R) of the cross member (45). The left and right rear cowls (38L, 38R) arranged to extend in the front-rear direction along the wall (52L) and the right side wall (52R) are further provided. The seat rail structure of the saddle riding type vehicle according to claim 1.   The seat of a saddle-ride type vehicle according to any one of claims 1 to 4, wherein the front wall (53) extends downward from the center in the vehicle width direction toward the outside. Rail structure.

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