JP2018165069A - Body frame structure for saddle-ride type vehicles - Google Patents

Abstract

In a body frame structure of a saddle-ride type vehicle including a head pipe, a main frame, a down frame, and a stiffener frame connecting between the main frame and the down frame, the front portion of the main frame is easily bent. It will be possible to absorb the stress from the front wheels and to reduce costs and weight. A head pipe, a front main frame extending rearward from the head pipe, a rear extending portion extending rearwardly from a lower rear end of the front main frame, and a rear lowering from the head pipe. And a stiffener frame 16 that connects the lower part of the upper down frame 40 to the lower part of the rear end of the front main frame 38 and the lower part of the rear extension part 39, and is formed of a pipe member. The front portion of the main frame 41 and the rear portion and the rear extension portion 39 of the front main frame 38 are overlapped and welded to each other at the first welding portion 44. [Selection] Figure 2

Description

  The present invention includes a head pipe that supports the steering handle so as to be steerable, a main frame that extends rearward from the head pipe, a down frame that is disposed below the main frame and extends downward from the head pipe, The present invention relates to a body frame structure of a saddle-ride type vehicle including a stiffener frame that connects the main frame and the down frame.

  A single main frame that extends rearward from the head pipe through the center in the width direction of the vehicle body, a down frame that extends rearward and downward from the head pipe below the main frame, and a connection between the main frame and the rear end of the down frame In a motorcycle body frame including left and right pivot frames, a head pipe, upper and lower gussets extending rearward from the head pipe, and a tension pipe that connects between the rear portions of the gussets are integrally formed. Patent Document 1 discloses a structure in which a pipe unit is configured.

JP 2004-299464 A

  However, the one disclosed in Patent Document 1 has a structure in which a forged down frame member and a tank rail member are welded to the upper and lower gussets of the head pipe unit, and the cross section changes around the head pipe unit. Therefore, the stress from the front wheel input to the head pipe unit via the front fork could not be absorbed by the entire head pipe unit.

  The present invention has been made in view of such circumstances, and it is possible to absorb the stress from the front wheel by facilitating the front portion of the main frame, and to reduce the cost and weight. It is an object of the present invention to provide a body frame structure for a saddle-ride type vehicle that can be used.

  In order to achieve the above object, the present invention provides a head pipe that supports a steering handle so as to be steerable, a main frame that extends rearward from the head pipe, and a head frame that is disposed below the main frame and that is disposed below the head pipe. In a vehicle body frame structure of a saddle-ride type vehicle comprising a down frame extending rearward and a stiffener frame connecting the main frame and the down frame, the head pipe and a front main frame extending rearward from the head pipe A rearward extending portion extending rearwardly from the lower rear end of the front main frame, an upper downframe extending rearwardly from the head pipe and constituting a part of the downframe, and the upper downframe The lower part is the lower part of the rear end of the front main frame and the lower part of the rear extension part. The front stiffener frame to be connected is formed integrally, and is made of a pipe material and forms the main frame together with the front main frame and the rear extension portion, and the rear portion of the front main frame The first feature is that the rear extension portion is welded so as to overlap each other at the first welding portion.

  In addition to the configuration of the first feature, the present invention is configured so that the pair of left and right front main frames that respectively constitute the front portions of the pair of left and right main frames bulge outward in the front vehicle width direction. However, it extends rearward from the head pipe, and the front parts of the pair of rear main frames are individually welded to the rear part of the front main frame and the rear extension part by the first welding part. This is the second feature.

  According to the third aspect of the present invention, in addition to the configuration of the second feature, the maximum width in the vehicle width direction of the pair of left and right main frames is set to be smaller than the width of the front fork in the vehicle width direction. Features.

  In addition to any of the configurations of the first to third features, the present invention has a fourth feature that the front main frame is formed thinner than the rear main frame in a side view.

  In addition to any of the configurations of the first to fourth features, the present invention provides the rear portion in a state where the front portion of the rear main frame is inserted into the rear portion of the front main frame and the rear extension portion. A fifth feature is that a front portion of the main frame is welded to the rear portion of the front main frame and the rear extension portion by the first welding portion.

  According to the present invention, in addition to any of the first to fifth features, the front main frame is formed in a cylindrical shape, and the upper down frame has an opening that opens forward and downward in the vehicle front-rear direction. A reinforcing member that is formed to have a U-shaped cross-sectional shape and closes the opening is welded to the lower part of the head pipe and the upper down frame.

  In the present invention, in addition to the configuration of the sixth feature, the reinforcing member is formed to have a substantially U-shaped cross-sectional shape opened to the upper down frame side at a portion corresponding to the upper down frame. The seventh down feature is that the upper down frame and the reinforcing member are welded by a second welded portion along a virtual straight line passing through the intermediate portion in the width direction of the down frame in a side view.

  According to the present invention, in addition to any of the configurations of the first to seventh features, the first welded portion is disposed so as to extend obliquely across the main frame in the width direction in a side view. The eighth feature.

  In the present invention, in addition to any one of the first to eighth features, a length between a rear edge uppermost end of the front main frame and a central axis of the head pipe may be a length of the head pipe. A ninth feature is that the length is set longer than the length along the central axis.

  In addition to any of the configurations of the first to ninth features, the present invention further includes an extension of the engine body disposed below the main frame to the upper side of the cylinder axis of the internal combustion engine mounted on the vehicle body frame. A tenth feature is that the first welded portion is disposed at a position where the line passes through the first welded portion in a side view.

  According to the first aspect of the present invention, the head pipe, the front main frame, the rear extending portion extending rearwardly from the rear end lower portion of the front main frame, and the upper portion extending rearwardly from the head pipe. The front main frame and the rear extension part are integrally formed with the down frame and the stiffener frame connecting the lower part of the upper down frame to the rear end part of the front frame and the rear extension part. The front main frame of the rear main frame that forms the main frame together with the connecting portion to the rear extension portion can be disposed at a position relatively separated from the head pipe, and the front main frame can be easily bent. Thus, it is possible to absorb the stress from the front wheel. Further, since the rear main frame is made of a pipe material, the cost can be reduced and the weight can be reduced, and the main frame can be easily bent.

  Further, according to the second feature of the present invention, the pair of front main frames formed to be curved so as to bulge outward in the vehicle width direction extend rearward from the head pipe, and the front main frames thereof Since the front part of the rear main frame is individually welded to the rear part and the rear extension part, the main frame can be easily bent.

  According to the third feature of the present invention, since the maximum width in the vehicle width direction of the pair of left and right main frames is smaller than the width of the front fork in the vehicle width direction, the width of the body frame is set to be narrow. Even if it is a saddle-ride type vehicle for roads, it is possible to ensure the ease of bending of the body frame.

  According to the fourth feature of the present invention, since the front main frame is thinner than the rear main frame in a side view, the front main frame can be made easier.

  According to the fifth aspect of the present invention, since the front main frame is welded in a state where the front portion of the rear main frame is inserted into the rear end portion and the rear extension portion, the length of the rear main frame is The length of the rear main frame can be adjusted by changing the insertion length of the rear main frame into the front main frame and the rear extension, and the yield of the body frame can be increased.

  According to the sixth aspect of the present invention, the front main frame is formed in a cylindrical shape, the upper down frame is formed to have a U-shaped cross section, and the reinforcing member that closes the upper down frame opening is provided. Since it is joined to the lower and upper down frames of the head pipe, the stress distribution in the front main frame can be improved.

  According to the seventh aspect of the present invention, the reinforcing member is formed to have a substantially U-shaped cross-sectional shape opened to the upper down frame side in a portion corresponding to the upper down frame, and the upper down frame; The portion corresponding to the upper down frame of the reinforcing member is welded by the second welded portion along the virtual straight line passing through the intermediate portion in the width direction of the down frame in a side view, so that the stress is easily dispersed in the down frame. By arranging the second welded portion on the side surface portion, stress concentration on the second welded portion can be avoided.

  According to the eighth feature of the present invention, the first welded portion, which is a welded portion between the front main frame and the rear extending portion, and the rear main frame, crosses the main frame obliquely in the width direction in a side view. Therefore, the weld length at the first welded portion can be made sufficiently large to increase the coupling strength between the front main frame and the rear extension portion and the rear main frame.

  According to the ninth feature of the present invention, the length between the rear edge uppermost end of the front main frame and the central axis of the head pipe is longer than the length along the central axis of the head pipe. The rear main frame is welded to the rear extension portion at a position as far as possible from the head cover, and the weld portion is not disposed around the head pipe, so that the stress from the front wheel can be well dispersed.

  Furthermore, according to the tenth feature of the present invention, the upward extension of the cylinder axis of the internal combustion engine disposed below the main frame passes through the first welded portion in a side view, so that the front main frame and the rear It is possible to disperse the stress from the front wheel satisfactorily by welding the rear main frame to the extended portion at a position as far as possible from the head cover and not arranging the welded portion around the head pipe.

1 is a left side view of a motorcycle. It is a left view of the principal part of a vehicle body frame. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2. FIG. 4 is a view taken in the direction of arrow 4 in FIG. FIG. 5 is a view taken in the direction of arrow 5 in FIG. 1 in a state in which a boarding seat is removed. It is the figure which looked at the head pipe unit in the state where the reinforcement member is not attached from the same direction as FIG. FIG. 7 is a sectional view taken along line 7-7 in FIG. 3. FIG. 8 is a sectional view taken along line 8-8 in FIG. 3. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 3.

  Embodiments of the present invention will be described with reference to FIGS. In the following description, the top, bottom, left and right, and front and rear refer to directions as viewed from the occupant riding the motorcycle.

  First, in FIG. 1, this saddle-ride type vehicle is an off-road motorcycle, for example, and a front fork 11 that pivotally supports a front wheel WF and a head pipe 13 that supports a bar-shaped steering handle 12 so as to be steerable are disposed at the front end. The vehicle body frame F included in the portion is mounted with a single-cylinder internal combustion engine E that exerts power for driving the rear wheels WR. The engine body 23 of the internal combustion engine E is disposed between the front wheels WF and the rear wheels WR. Thus, it is supported by the body frame F.

  2 to 4, the vehicle body frame F includes the head pipe 13, a pair of left and right main frames 14 extending rearwardly downward from the head pipe 13, and the lower side of the main frame 14. A single down frame 15 extending rearward and downward from the head pipe 13, a stiffener frame 16 connecting the main frame 14 and the down frame 15, and left and right extending continuously from the lower end of the down frame 15 and extending rearward A pair of lower frames 17, and a pair of left and right pivot frames 18 having upper ends joined to the rear ends of the main frame 14 and extending downward, and rear ends of the lower frames 17 being connected to the lower ends. An upper cross member 19 provided between upper portions of the pair of left and right pivot frames 18, and both the pivots A lower cross member 20 provided between the lower end portions of the rim 18, a pair of left and right seat rails 21 having a front end portion connected to the upper end portion of the pivot frame 18 and extending rearward, and an intermediate portion in the vertical direction between the pivot frames 18. And a pair of left and right rear frames 22 for connecting the rear portions of the both seat rails 21.

  The engine body 23 of the internal combustion engine E is supported by the vehicle body frame F so as to be disposed below the main frame 14, and the front portion of the engine body 23 is provided on the down frame 15. Supported by a first hanger 24, the lower part of the engine body 23 is supported by a second hanger 25 provided on the lower frame 17, and the upper part of the engine body 23 is provided on the upper part of the pivot frame 18. Supported by the third hanger 26.

  The axle 27 of the rear wheel WR is pivotally supported by a rear end portion of a swing arm 28 that extends in the front-rear direction with the rear wheel WR sandwiched from both sides, and the front end portion of the swing arm 28 is supported by a lower portion of the pivot frame 18. It is supported via a shaft 29 so that it can swing up and down.

  A link mechanism 30 is provided between the lower cross member 20 and the swing arm 28 of the vehicle body frame F, a link member 31 constituting a part of the link mechanism 30, an upper cross member 19 of the vehicle body frame F, A rear cushion unit 32 is provided between the two.

  A fuel tank 33 is provided on both main frames 14 above the engine body 23, and the vehicle is placed so as to be supported by a seat support member 35 mounted on the seat rail 21 behind the fuel tank 33. A seat 34 is disposed.

  The head pipe 13, a front main frame 38 that extends rearward from the head pipe 13, a rear extension 39 that extends rearwardly from the lower rear end of the front main frame 38, and a rear lowering from the head pipe 13 And the stiffener frame 16 connecting the lower part of the upper down frame 40 to the rear end of the front frame 38 and the rear extension 39 so as to form a head pipe unit 43. Thus, they are integrally formed by casting.

  The front main frame 38 is formed in a cylindrical shape having a rectangular cross section and extends rearward and downward from the head pipe 13, and the rear extension 39 is formed in the rear as shown in FIG. The lower end 39a of the rear end of the extending portion 39 is formed so as to be positioned below the extension surface PL extending rearward in the vehicle front-rear direction of the lower surface of the front main frame 38 in a side view. The other end portion of the stiffener frame 16, which is integrally connected to the lower portion of the upper down frame 40, is integrally connected to the lower portion of the rear end of the front frame 38 and the lower portion of the rear extension portion 39. Established.

  The main frame 14 includes the front main frame 38, the rear extension 39, and a rear main frame 41 made of a pipe material having a rectangular cross section, and the rear and the rear of the front main frame 38. The extension part 39 and the front part of the rear main frame 41 are welded so as to overlap each other at the first welding part 44.

  Referring also to FIG. 5, the pair of left and right front main frames 38 that respectively constitute the front portions of the pair of left and right main frames 14 are curved so as to bulge outward in the front vehicle width direction. The pipes 13 are extended rearward, and the front portions of the pair of the rear main frames 41 are welded individually to the rear and rear extension portions 39 of the front main frames 38 by the first welding portions 44. Is done.

  Moreover, the maximum width in the vehicle width direction of the pair of left and right main frames 14 is set to be smaller than the width of the front fork 11 in the vehicle width direction. That is, a pair of left and right virtual straight lines L extending in the vehicle front-rear direction through the vehicle width direction outermost ends (in this embodiment, the vehicle width direction outermost end of the rear main frame 41 in this embodiment) of the pair of left and right main frames 14 in plan view. However, the vehicle of the pair of left and right main frames 14 passes through the vehicle width direction outermost end 11aa of the top bridge 11a of the front fork 11 when the steering handle 12 is in the straight traveling state. The maximum width in the width direction is set.

  In addition, in a state where the front portion of the rear main frame 41 is inserted into the rear portion of the front main frame 38 and the rear extension portion 39, the front portion of the rear main frame 41 is the rear portion of the front main frame 38 and The front main frame 38 is formed to be thinner than the rear main frame 39 in a side view. That is, the width W1 in the side view of the front main frame 38 is set smaller than the width W2 in the side view of the rear main frame 41.

  The first welded portion 44 is disposed so as to extend obliquely across the main frame 14 as viewed from the side so as to be positioned forward in the vehicle front-rear direction as it goes upward. The first welded portion 44 is disposed at a position where an upward extension line of the cylinder axis C of the engine main body 23 disposed below 14 passes through the first welded portion 44 in a side view.

  A length LA between the rear edge uppermost end 38a of the front main frame 38 and the center axis CL of the head pipe 13 is set to be longer than a length LB along the center axis CL of the head pipe 13. Is done.

  A support protrusion 45 that protrudes upward and a third hanger 26 that protrudes downward are provided at the upper end of the pivot frame 18, and the front end of the seat rail 21 is connected to the support protrusion 45. Is done.

  Incidentally, an air cleaner 47 for purifying the air supplied to the cylinder head 46 (see FIG. 1) of the engine body 23 is covered between the ride seats 34 from above and between the pair of left and right seat rails 21. Be placed.

  The down frame 15 includes an upper down frame 40, an intermediate down frame 48 welded to the lower part of the upper down frame 40 and extending downward, and a lower part welded to the intermediate down frame 48 and extended downward. The down frame 49 includes a lower part of the head pipe 13 and a part of the reinforcing member 50 welded to the upper down frame 40.

  6 and 7 together, the upper down frame 40 has an opening 51 opened forward and downward in the vehicle front-rear direction so that the cross-sectional shape is substantially U-shaped. .

  8 and 9 together, the reinforcing member 50 includes a ring-shaped head pipe reinforcing portion 50a connected to the lower portion of the head pipe 13, and the head pipe reinforcing portion 50a. Forging is performed by integrally including a down frame reinforcing portion 50b constituting a part of the frame 15. The portion corresponding to the upper down frame 40 of the reinforcing member 50, that is, the down frame reinforcing portion 50b, is formed to have a substantially U-shaped cross-sectional shape opened toward the upper down frame 40 side. The second pipe 52 is welded to the head pipe 13 and the upper down frame 40.

  Moreover, the second welded portion 52 is disposed along a virtual straight line VL that passes through the intermediate portion in the width direction of the down frame 15 in a side view at a portion corresponding to the upper down frame 40.

  The upper part of the intermediate part down frame 48 is inserted into the lower part of the upper down frame 40 and the lower part of the down frame reinforcing part 50b of the reinforcing member 50, and the part overlapping the lower part of the upper down frame 40 is the third part. A welded portion 53 is welded to the upper down frame 40, and a portion overlapping the lower portion of the down frame reinforcing portion 50b is welded to the down frame reinforcing portion 50b by a fourth welded portion 54.

  The upper part of the lower down frame 49 is welded to the lower part of the intermediate part down frame 48 by a fifth weld 55. The lower down frame 49 integrally has a pair of branch portions 49 a branched to the left and right, and the branch portions 49 a and the lower end portion of the pivot frame 18 are connected by the lower frame 17.

  Next, the operation of this embodiment will be described. The head pipe 13, the front main frame 38 extending rearward from the head pipe 13, and the rear extension extending rearwardly downward from the lower rear end of the front main frame 38. A portion 39, an upper down frame 40 extending rearwardly from the head pipe 13 and constituting a part of the down frame 15; The stiffener frame 16 connected to the lower part of the extension part 39 is formed integrally, and is made of a pipe material and is arranged in front of the rear main frame 41 constituting the main frame 14 together with the front main frame 38 and the rear extension part 39. And the rear portion of the front main frame 38 and the rear extension portion 39 are first welded portions. 4, the front main frame 38 of the rear main frame 41 and the connecting portion to the rear extension 39 can be arranged at a position relatively separated from the head pipe 13. The main frame 38 can be easily bent to absorb the stress from the front wheel WF. Further, since the rear main frame 41 is made of a pipe material, the cost and weight can be reduced and the main frame 14 can be easily bent.

  Further, the pair of left and right front main frames 38 that respectively constitute the front portions of the pair of left and right main frames 14 extend rearward from the head pipe 13 while curving so as to bulge outward in the front vehicle width direction. The front portions of the pair of the rear main frames 41 are individually welded to the rear portions of the front main frames 38 and the rear extension portions 39 by the first welded portions 44. It can be easily bent.

  Further, since the maximum width in the vehicle width direction of the pair of left and right main frames 14 is set to be smaller than the width of the front fork 11 in the vehicle width direction, the vehicle body frame F is set to have a narrow width for off-road use. Even if it is a motorcycle, the ease of bending of the body frame F can be ensured.

  Further, since the front main frame 38 is formed thinner than the rear main frame 41 in a side view, the front main frame 38 can be made easier to bend.

  In addition, in a state where the front portion of the rear main frame 41 is inserted into the rear portion of the front main frame 38 and the rear extension portion 39, the front portion of the rear main frame 41 is the rear portion of the front main frame 38. Since the first weld 44 is welded to the rear extension 39, the length of the rear main frame 41 is inserted into the front main frame 38 and the rear extension 39 of the rear main frame 41. It can be adjusted by changing the length, and the yield of the body frame F can be increased.

  The front main frame 38 is formed in a cylindrical shape, and the upper down frame 40 is formed to have a U-shaped cross-sectional shape having an opening 51 that opens forward and downward in the vehicle front-rear direction. Since the reinforcing member 50 that closes the opening 51 is welded to the lower part of the head pipe 13 and the upper down frame 40, the stress distribution in the front main frame 38 can be improved.

  Further, the reinforcing member 50 is formed to have a substantially U-shaped cross-sectional shape opened to the upper down frame 40 at a portion corresponding to the upper down frame 40, and the upper down frame 40 and the reinforcement The portion corresponding to the upper down frame 40 of the member 50 is welded by the second welded portion 52 along the virtual straight line VL passing through the intermediate portion in the width direction of the down frame 15 in a side view. The stress concentration on the second welded portion 52 can be avoided by arranging the second welded portion 52 on the flat side surface portion where the stress is easily dispersed.

  The first welded portion 44 that joins the rear portion of the front main frame 38 and the rear extension portion 39 and the rear main frame 41 crosses the main frame 14 obliquely in the width direction in a side view. Since it is arranged so as to extend, the welding length at the first welded portion 44 is made sufficiently large, and the coupling strength between the front main frame 38 and the rear extending portion 39 and the rear main frame 41 is increased. Can be increased.

  A length LA between the rear edge uppermost end 38a of the front main frame 38 and the center axis CL of the head pipe 13 is set to be longer than a length LB along the center axis CL of the head pipe 13. Therefore, a welded portion is arranged around the head pipe 13 such that the rear main frame 41 is welded to the front main frame 38 and the rear extension 39 at a position as far as possible from the head cover 13. By not doing so, the stress from the front wheel WF can be well dispersed.

  Further, an extension line extending upward of the cylinder axis C of the engine body 23 disposed below the main frame 14 of the internal combustion engine E mounted on the vehicle body frame F passes through the first welded portion 44 in a side view. The rear main frame 41 is welded to the front main frame 38 and the rear extension 39 at a position as far as possible from the head cover 13, and no weld is disposed around the head pipe 13. Thus, the stress from the front wheel WF can be well dispersed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

  For example, in the above-described embodiment, the case where the present invention is applied to an off-road motorcycle has been described. However, the present invention can also be applied to a motorcycle other than an off-road motorcycle. The present invention can be widely applied to saddle-ride type vehicles including motor tricycles other than motorcycles.

DESCRIPTION OF SYMBOLS 11 ... Front fork 12 ... Steering handle 13 ... Head pipe 14 ... Main frame 15 ... Down frame 16 ... Stiffener frame 23 ... Engine body 38 ... Front main Frame 38a ... Rear edge uppermost end 39 of front main frame ... Rear extension 40 ... Upper down frame 41 ... Rear main frame 44 ... First weld 50 ... Reinforcement Member 51 ... Opening 52 ... Second weld C ... Cylinder axis CL ... Head pipe center axis E ... Internal combustion engine F ... Body frame LA ... Front main Length LB between the uppermost end of the rear edge of the frame and the center axis of the head pipe ... Length VL along the center axis of the head pipe ... Virtual straight line

Claims (10)

  A head pipe (13) that supports the steering handle (12) so as to be steerable, a main frame (14) that extends rearward from the head pipe (13), and a lower part of the main frame (14). Body frame structure of saddle-ride type vehicle comprising a down frame (15) extending rearwardly downward from a head pipe (13), and a stiffener frame (16) connecting between the main frame (14) and the down frame (15). The head pipe (13), a front main frame (38) extending rearward from the head pipe (13), and a rear extension extending rearwardly downward from a lower rear end of the front main frame (38) (39) and an upper down portion extending rearwardly downward from the head pipe (13) and constituting a part of the down frame (15) A frame (40), and a stiffener frame (16) for connecting a lower portion of the upper down frame (40) to a rear lower portion of the front main frame (38) and a lower portion of the rear extension portion (39). A front portion of a rear main frame (41) which is integrally formed and is made of a pipe material and constitutes the main frame (14) together with the front main frame (38) and the rear extension portion (39); A vehicle body frame structure for a saddle-ride type vehicle, characterized in that the rear portion of the main frame (38) and the rear extension portion (39) are welded to each other at the first welding portion (44).   The pair of left and right front main frames (38) that respectively constitute the front portions of the pair of left and right main frames (14) are curved from the head pipe (13) so as to bulge outward in the front vehicle width direction. The rear part of the front main frame (38) and the rear extension part (39) extend rearward, and the front part of the pair of rear main frames (41) is the first welded part (44). The vehicle body frame structure of a saddle-ride type vehicle according to claim 1, wherein the body frame structure is welded individually.   The saddle riding according to claim 2, wherein the maximum width in the vehicle width direction of the pair of left and right main frames (14) is set smaller than the width of the front fork (11) in the vehicle width direction. Body frame structure of type vehicle.   The vehicle body of the saddle-ride type vehicle according to any one of claims 1 to 3, wherein the front main frame (38) is formed narrower than the rear main frame (41) in a side view. Frame structure.   With the front part of the rear main frame (41) inserted into the rear part of the front main frame (38) and the rear extension part (39), the front part of the rear main frame (41) 5. The welding according to claim 1, wherein the first welded part is welded to the rear part of the front main frame and the rear extension part. Body frame structure for saddle-ride type vehicles.   The front main frame (38) is formed in a cylindrical shape, and the upper down frame (40) has an opening (51) opened forward and downward in the vehicle longitudinal direction and has a U-shaped cross-sectional shape. The reinforcing member (50) formed as described above and closing the opening (51) is welded to the lower part of the head pipe (13) and the upper down frame (40). The vehicle body frame structure of a saddle-ride type vehicle according to any one of the above.   The reinforcing member (50) is formed to have a substantially U-shaped cross-sectional shape opened to the upper down frame (40) at a portion corresponding to the upper down frame (40). (40) and a portion corresponding to the upper down frame (40) of the reinforcing member (50) are arranged along a virtual straight line (VL) passing through the intermediate portion in the width direction of the down frame (15) in a side view. The body frame structure of a saddle-ride type vehicle according to claim 6, wherein the vehicle body frame structure is welded at two welds (52).   The said 1st welding part (44) is arrange | positioned so that it may extend across the said main frame (14) diagonally in the width direction by a side view, The any one of Claims 1-7 characterized by the above-mentioned. The body frame structure of the saddle-ride type vehicle described.   The length (LA) between the rear edge uppermost end (38a) of the front main frame (38) and the central axis (CL) of the head pipe (13) is the center of the head pipe (13). The vehicle body frame structure of a saddle-ride type vehicle according to any one of claims 1 to 8, wherein the vehicle body frame structure is set to be longer than a length (LB) along the axis (CL).   Of the internal combustion engine (E) mounted on the vehicle body frame (F), the extension line extending upward from the cylinder axis (C) of the engine body (23) disposed below the main frame (14) is a side view. The body frame of the saddle-ride type vehicle according to any one of claims 1 to 9, wherein the first welded portion (44) is disposed at a position passing through the first welded portion (44). Construction.