Frame structure for driving vehicle mounted in selim

Description

FRAME STRUCTURE FOR SADDLE-MOUNTED DRIVING VEHICLE BACKGROUND OF THE INVENTION Field of Invention

[0001] The present invention relates to a frame structure for a saddle-mounted ride-on vehicle. Description of the related technique

[0002] A known frame structure for a conventional saddle-mounted riding vehicle includes a pair of left and right rear frames coupled to the rear parts of a pair of left and right main frames (see, for example, Republished International Publication No. WO 2016046936).

[0003] In the frame structure described above, the space near a connection between each of the main frames and an associated rear frame is small, and engineering is required to distribute the stresses acting on the vehicle body frame.

[0004] An object of the present invention, achieved in view of the circumstances described above, is to increase the space near a connection between each of the main frames and one of the associated rear frames and to efficiently distribute stresses acting on the vehicle body frame. SUMMARY OF THE INVENTION

[0005] In a vehicle body frame structure for a saddle-mounted riding vehicle, the structure including: a pair of left and right main frames extending rearward relative to a head tube; and a pair of left and right rear frames extending in a front-to-rear direction on a rear side of the main frames, a first reinforcement with a plate shape and extending upward from one of the main frames, and a second reinforcement with a plate shape and extending upward Petition 870260025108, dated 03 / 18 / 2026, page 6 / 48 Two-thirds of the other main frames are provided, and one of the rear frames is connected to the first reinforcement, and the other of the rear frames is connected to the second reinforcement.

[0006] The space near the connection between each of the main frames and an associated rear frame can be increased, and the stresses acting on the vehicle body frame can be efficiently distributed. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a left side view of a saddle-mounted riding vehicle with a vehicle body cover removed;

[0008] Figure 2 is a left side view of a vehicle body frame and a fuel tank;

[0009] Figure 3 is a top view of the vehicle body frame;

[0010] Figure 4 is a perspective view of reinforcements that join main frames and rear frames; and

[0011] Figure 5 is a left side view of the vehicle body frame. DETAILED DESCRIPTION OF THE PREFERRED MODALITY

[0012] One embodiment of the present invention will be described below with reference to the drawings. Unless otherwise stated, directions including front-to-back, left-to-right, and up-to-down mentioned in the description are the same as directions with respect to a vehicle body. Reference signs for forward, upward, and left shown in the drawings indicate a front side of the vehicle body, an upper side of the vehicle body, and a left side of the vehicle body, respectively. [Type]

[0013] Figure 1 is a side view of a driving vehicle. Petition 870260025108, dated 03 / 18 / 2026, p. 7 / 48 3 / 13 mounted on saddle 10 according to an embodiment of the present invention.

[0014] The saddle-mounted driving vehicle 10 is a vehicle including a vehicle body frame 11, a power unit 12 supported on the vehicle body frame 11, a front fork 14 supporting a front wheel 13 in a steerable form, a swingarm 16 supporting a rear wheel 15, and a seat 17 for a driver.

[0015] The saddle-mounted driving vehicle 10 is a vehicle in which the driver sits mounted on the seat 17. The seat 17 is provided above a rear part of the vehicle body frame 11.

[0016] The vehicle body frame 11 includes a front tube 18 provided in a front end portion of the vehicle body frame 11, a front frame 19 located on a rear side of the front tube 18, and a rear frame 20 located on a rear side of the front frame 19. A front end portion of the front frame 19 is connected to the front tube 18.

[0017] Seat 17 is supported on rear frame 20.

[0018] The front fork 14 is supported on the front tube 18 so that it can be oriented to the left and to the right. The front wheel 13 is supported on an axle 13a provided in a lower end portion of the front fork 14. A handlebar 21 to guide the rider's grip is mounted on an upper end portion of the front fork 14.

[0019] The swing arm 16 is supported on a pivot shaft 22 which is supported on the vehicle body frame 11. The pivot shaft 22 is a shaft extending horizontally in a vehicle width direction. The pivot shaft 22 passes through a front end portion of the swing arm 16. The swing arm 16 swings upward and Petition 870260025108, dated 03 / 18 / 2026, page 8 / 48 4 / 13 down around pivot 22.

[0020] The rear wheel 15 is supported on an axle 15a provided in a rear end portion of the swingarm 16.

[0021] The power unit 12 is arranged between the front wheel and the rear wheel 15 and supported on the vehicle body frame 11.

[0022] The power unit 12 is an internal combustion engine. The power unit 12 includes a crankcase 23 and a cylinder 24 that houses a reciprocating piston. An exhaust device 25 is connected to an exhaust port of cylinder 24.

[0023] An output from power unit 12 is transmitted to the rear wheel 15 via an electrical power transmission member that connects power unit 12 and rear wheel 15 to each other.

[0024] The saddle-mounted riding vehicle 10 further includes a front mudguard 26 covering the front wheel 13 from above, a rear mudguard 27 covering the rear wheel 15 from above, footrests 28 where the rider places his feet, and a fuel tank 29 that stores fuel to be used by the power unit 12.

[0025] The front mudguard 26 is mounted on the front fork 14. The rear mudguard 27 and the footrests 28 are provided on a lower side relative to the seat 17. The fuel tank 29 is supported on the vehicle body frame 11.

[0026] As shown in Figure 2, the front frame 19 includes a main frame 31 extending in a front-to-rear direction from the vehicle on a lower side of the fuel tank 29 and on an upper side of the power unit 12.

[0027] The main frame 31 extends backward and downward, and slopes downward substantially vertically at a slope point A located substantially directly below a rear end portion of the fuel tank 29.

[0028] The front frame 19 has a lower frame 30 if Petition 870260025108, dated 03 / 18 / 2026, page 9 / 48 5 / 13 extending down from the front tube 18 on a rear side of the front wheel 13. The power unit 12 is positioned between the lower frame 30 and the main frame 31 (see Figure 1).

[0029] The front frame 19 has a lower frame 32 extending rearward relative to the vehicle on a lower side of the power unit 12.

[0030] The lower frame 32 is connected to a subframe 34. The subframe 34 extends straight aft relative to the vehicle and diagonally upward, and inclines at a tilt point B to be connected to the rear frame 20.

[0031] The 20 rear frame, the 34 subframe, and the front frame form a substantially triangular S-shaped space between them.

[0032] In the substantially triangular space S, a battery 37 and an ABS Modulator 38 are placed, as shown in Figure 1.

[0033] As shown in Figure 3, the main frame 31 has a right-side main frame (a) 31A and a left-side main frame (a) 31B.

[0034] The rear frame 20 has a right-side rear frame (one) 20A and a left-side rear frame (one) 20B. An RH reference sign indicates a right side of the vehicle body.

[0035] The main right-side frame 31A is connected to the rear right-side frame 20A by a first reinforcement 35A with a plate shape and described below. The main left-side frame 31B is connected to the rear left-side frame 20B by a second reinforcement 35B with a plate shape.

[0036] The first reinforcement 35A and the second reinforcement 35B are connected together by a cross member 42 extending in the vehicle width direction.

[0037] Cross member 42 is a pipe member. A fuel tank support 44 extending rearward relative to Petition 870260025108, dated 03 / 18 / 2026, page 10 / 48 6 / 13 of the vehicle is mounted on an upper middle portion of the cross member 42. As shown in Figure 2, the fuel tank 29 is mounted on the fuel tank support 44 from above and supported by the vehicle body frame 11.

[0038] Figure 4 is an enlarged perspective view of the connecting portions between the main frame 31 and the rear frame 20.

[0039] Each of the first reinforcement 35A and the second reinforcement 35B has a substantially trapezoidal shape when viewed from the side.

[0040] The first reinforcement 35A extends backward and diagonally upward near the tilt point A (see Figure 2) of the main frame on the right side 31A.

[0041] The first reinforcement 35A is formed in a hollow plate format by coupling together an outer member 39a with a plate shape and an inner member 39b with a plate shape and located on an inner side with respect to the outer member 39a in the vehicle width direction.

[0042] The outer member 39a of the first reinforcement 35A has an upper end portion that is inclined in an arc shape to grip an outer portion of the right-side rear frame 20A, and the inner member 39b of the first reinforcement 35A has an upper end portion that is inclined in an air shape to grip an inner portion of the right-side rear frame 20A.

[0043] The upper end portion of the outer member 39a and the upper end portion of the inner member 39b form a tube-shaped portion 39c between them, and one end of the right-side rear frame 20A is fitted into the tube-shaped portion 39c for connection of the right-side rear frame 20A.

[0044] The right-side rear frame 20A is fastened between the outer member 39a and the inner member 39b, which form the first reinforcement 35A.

[0045] The right-side main frame 31A is connected to a Petition 870260025108, dated 03 / 18 / 2026, page 11 / 48 7 / 13 lower end portion of the first reinforcement 35A. The main frame on the right side 31A is attached between the outer member 39a and the inner member 39b, which form the first reinforcement 35A.

[0046] The second reinforcement 35B extends backward and diagonally upward near the tilt point A (see Figure 2) of the main frame on the left side 31B.

[0047] The second reinforcement 35B is formed in a hollow plate format by coupling together an outer member 41a with a plate shape and an inner member 41b with a plate shape and located on an inner side with respect to the outer member 41a in the vehicle width direction.

[0048] The outer member 41a of the second reinforcement 35B has an upper end portion that is inclined in an air shape to grip an outer portion of the left-side rear frame 20B, and the inner member 41b of the second reinforcement 35B has an upper end portion that is inclined in an arc shape to grip an inner portion of the left-side rear frame 20B.

[0049] The upper end portion of the outer member 41a and the upper end portion of the inner member 41b form a tube-shaped portion 41c between them, and one end of the left-side rear frame 20B is fitted into the tube-shaped portion 41c for connection of the left-side rear frame 20B.

[0050] The left-side rear frame 20B is attached between the outer member 41a and the inner member 41b, which form the second reinforcement 35B.

[0051] The main frame on the left side 31B is connected to a lower end portion of the second reinforcement 35B. The main frame on the left side 31B is fastened between the outer member 41a and the inner member 41b, which form the second reinforcement 35B.

[0052] As shown in Figure 5, the second reinforcement 35B has Petition 870260025108, dated 03 / 18 / 2026, page 12 / 48 8 / 13 a top edge portion 51 extending along the rear frame 20, and a bottom edge portion 53 extending along the main frame 31.

[0053] The first 35A reinforcement still has a 51 top edge portion extending along the 20 rear frame, and a 53 bottom edge portion extending along the 31 main frame.

[0054] The shape of each of the reinforcements 35 is not limited to a substantially trapezoidal shape.

[0055] The second reinforcement 35B is placed on a rear side with respect to an intersection point C2 of a second imaginary extension line L2 extending the rear frame 20B forward and the main frame 31B. The first reinforcement 35A is placed on a rear side with respect to an intersection point C1 of a first imaginary extension line L1 extending the rear frame 20A forward and the main frame 31A.

[0056] The 20A and 20B rear frames extend straight.

[0057] In this configuration, space is provided between the intersection point C1 and the first reinforcement 35A and between the intersection point C2 and the second reinforcement 35B. That is, space can be provided above the main frame 31.

[0058] In the present embodiment, the first reinforcement 35A extends backward and diagonally upward near the tilt point A (see Figure 2) of the main frame 31A, and the second reinforcement 35B extends backward and diagonally upward near the tilt point A (see Figure 2) of the main frame 31B. Furthermore, the rear frames 20A and 20B are connected to the upper end portions of the first reinforcement 35A and the second reinforcement 35B, respectively. Thus, space can be provided above the main frames 31A and 31B and below the rear frames 20A and 20B.

[0059] Therefore, the degree of flexibility is increased in the layout, Petition 870260025108, dated 03 / 18 / 2026, page 13 / 48 9 / 13 allowing onboard devices, such as a fuel pump 33, to be placed in the space provided.

[0060] Furthermore, reinforcements 35A and 35B are formed by combining the outer members 39a and 41a and the inner members 39b and 41b, respectively, providing a high degree of shape flexibility. This configuration allows the stresses acting on the vehicle body frame 11 to be efficiently distributed. Thus, a facilitating effect on optimizing frame stiffness can be produced.

[0061] In the present embodiment, the first reinforcement 35A and the second reinforcement 35B are coupled together by the cross member 42, which is a tube member, so that the stress on the vehicle body frame 11 can be improved at low cost.

[0062] In this embodiment, the support for the fuel tank 44, where the fuel tank 29 is to be mounted, is provided on the cross member 42.

[0063] This configuration allows the fuel tank 29 to be mounted with high rigidity, because the cross member 42 alone forms part of the vehicle body frame 11.

[0064] (Configurations supported by the mode described above)

[0065] The mode described above supports the following configurations.

[0066] (First Configuration) A vehicle body frame structure for a saddle-mounted riding vehicle, the structure including: a pair of left and right main frames extending rearward relative to a head tube; and a pair of left and right rear frames extending in a front-to-rear direction on a rear side of the main frames, wherein a first reinforcement having a plate shape and extending upward from one of the main frames, and a second reinforcement having a plate shape and extending upward from the other of the frames. Petition 870260025108, dated 03 / 18 / 2026, page 14 / 48 10 / 13 main frames are provided, and one of the rear frames is connected to the first reinforcement, and the other of the rear frames is connected to the second reinforcement.

[0067] In the configuration as described above, space can be provided above the main frames and below the rear frames. Thus, an effect of increasing the degree of flexibility in the layout can be produced.

[0068] (Second Configuration) The vehicle body frame structure for a saddle-mounted riding vehicle according to the First Configuration, wherein one of the rear frames is connected to an upper end portion of the first reinforcement, and the other of the rear frames is connected to an upper end portion of the second reinforcement.

[0069] Each of the reinforcements has a high degree of flexibility in form.

[0070] The configuration, as described above, allows for efficient distribution of stresses acting on the vehicle body frame. Thus, an effect that facilitates the optimization of frame rigidity can be produced.

[0071] (Third Configuration) The vehicle body frame structure for a saddle-mounted driving vehicle according to the First Configuration or the Second Configuration, including a cross member connecting the first reinforcement and the second reinforcement in a vehicle-width direction.

[0072] The structure as described above can produce an effect to improve the tension of the vehicle body frame at low cost.

[0073] (Fourth Configuration) The vehicle body frame structure for a saddle-mounted driving vehicle according to the Third Configuration, wherein the cross member is a tube member. Petition 870260025108, dated 03 / 18 / 2026, page 15 / 48 11 / 13

[0074] The configuration, as described above, can produce an effect of reducing vehicle weight and improving vehicle body frame tension at low cost.

[0075] (Fifth Configuration) The vehicle body frame structure for a saddle-mounted riding vehicle according to the Third Configuration or Fourth Configuration, wherein a fuel tank support, where a fuel tank is to be mounted, is provided on the cross member.

[0076] The configuration, as described above, produces an effect of being able to mount the fuel tank with high rigidity, because the cross member is part of the vehicle body frame.

[0077] (Sixth Configuration) The vehicle body frame structure for a saddle-mounted riding vehicle according to the Fifth Configuration, wherein the fuel tank support extends behind the cross member.

[0078] The configuration, as described above, produces the effect of being able to install an extended fuel tank at the rear relative to the vehicle.

[0079] (Seventh Configuration) The vehicle body frame structure for a saddle-mounted riding vehicle according to any one of the First Configuration to the Sixth Configuration, wherein the first reinforcement is placed on a rear side with respect to a point of intersection of a first imaginary extension line extending one of the rear frames forward and one of the main frames, and the second reinforcement is placed on a rear side with respect to a point of intersection of a second imaginary extension line extending another of the rear frames forward and another of the main frames.

[0080] In the configuration as described above, space can be provided above the main frames and below the rear frames. Petition 870260025108, dated 03 / 18 / 2026, page 16 / 48 12 / 13 Thus, an effect of increasing the degree of flexibility in layout can be produced.

[0081] (Eighth Configuration) The vehicle body frame structure for a saddle-mounted driving vehicle according to any of the First to Seventh Configurations, wherein the first reinforcement is formed in a hollow plate form coupling together an outer member with a plate form and an inner member with a plate form and located on an inner side in the vehicle width direction with respect to the outer member, and the second reinforcement is formed in a hollow plate form coupling together an outer member with a plate form and an inner member with a plate form and located on an inner side in the vehicle width direction with respect to the outer member.

[0082] The configuration, as described above, allows for efficient distribution of stresses acting on the vehicle body frame. Thus, a facilitating effect on optimizing frame rigidity can be produced.

[0083] (Ninth Configuration) The vehicle body frame structure for a saddle-mounted riding vehicle according to the Eighth Configuration, wherein one of the rear frames is attached between the outer member and the inner member, and the other of the rear frames is attached between the outer member and the inner member.

[0084] The configuration, as described above, allows for the efficient distribution of stresses acting on the vehicle body frame. Thus, an effect that facilitates the optimization of frame rigidity can be produced.

[0085] (Tenth Configuration) The vehicle body frame structure for a saddle-mounted riding vehicle according to the Eighth Configuration or Ninth Configuration, wherein one of the main frames is fastened between the outer member and the inner member, and another Petition 870260025108, dated 03 / 18 / 2026, page 17 / 48 13 / 13 of the main frames is trapped between the outer member and the inner member.

[0086] The configuration, as described above, allows for efficient distribution of stresses acting on the vehicle body frame. Thus, a facilitating effect on optimizing frame rigidity can be produced.

[0087] The previous embodiment describes an aspect of the present invention, and the present invention is not limited to the previous embodiment. List of reference signs 18 front tube rear frame 20A rear frame, right side 20B rear frame, left side, fuel tank, main frame 31A main panel on the right side 31B main frame on the left side 35A first reinforcement 35B second reinforcement 39th external member 39b inner member 41a external member 41b inner member cross member fuel tank support C1 intersection point C2 intersection point L1 first line of extension L2 second line extension Petition 870260025108, dated 03 / 18 / 2026, page 18 / 48

Claims

1. Vehicle body frame structure for a saddle-mounted riding vehicle, characterized in that it comprises: a pair of left and right main frames (31) extending rearwards with respect to a front tube (18); and a pair of left and right rear frames (20) extending in a front-to-rear direction on a rear side of the main frames (31), wherein a first reinforcement (35A) with a plate shape and extending upwards from one of the main frames (31A), and a second reinforcement (35B) with a plate shape and extending upwards from another of the main frames (31B) are provided, and one of the rear frames (20A) is connected to the first reinforcement (35A), and the other of the rear frames (20B) is connected to the second reinforcement (35B), the first reinforcement (35A) and the second reinforcement (35B) are formed by the joining of an outer member (39a, 41a) and an inner member (39b, 41a).41b) which are curved in an arc shape so as to be able to support the right-side rear frame (20A, 20B), respectively, each of the first reinforcement (35A) and the second reinforcement (35B) having a tube-shaped portion (39c, 41c) into which the right-side rear frame (20A, 20B) is fitted, the first reinforcement (35A) has a shape in which a position occupied by a connecting portion with one of the main frames (31A) in the front-to-rear direction and a position occupied by a connecting portion with one of the rear frames (20A) in the front-to-rear direction overlap, and the first support (35A) is placed on the rear side at an intersection point (C1) of one of the main frames (31A) and an extension line (L1) imaginarily extending the tube-shaped portion (39c) of the first reinforcement. 870260025108, dated 03 / 18 / 2026, page 19 / 48 2 / 4 (35A) onwards,The second reinforcement (35B) has a shape in which a position occupied by a connecting portion with the other of the main frames (31B) in the front-to-rear direction and a position occupied by a connecting portion with the other of the rear frames (20B) in the front-to-rear direction overlap, and the second reinforcement (35B) is placed on a rear side with respect to an intersection point (C2) of the other of the main frames (31B) and the other of the extension lines (L2) imaginarily extending the tube-shaped portion (41c) of the second reinforcement (35B) forward.

2. Vehicle body frame structure for a saddle-mounted riding vehicle according to claim 1, characterized in that one of the rear frames (20A) is connected to an upper end portion of the first reinforcement (35A), and the other of the rear frames (20B) is connected to an upper end portion of the second reinforcement (35B).

3. Vehicle body frame structure for a saddle-mounted driving vehicle, according to claim 1 or 2, characterized in that it comprises a cross member (42) connecting the first reinforcement (35A) and the second reinforcement (35B) in a vehicle-width direction.

4. Vehicle body frame structure for a saddle-mounted driving vehicle according to claim 3, characterized in that the cross member (42) is a tube member.

5. Vehicle body frame structure for a saddle-mounted riding vehicle according to claim 3 or 4, characterized in that a fuel tank support (44), where a fuel tank (29) is to be mounted, is provided in the cross member (42). Petition 870260025108, dated 03 / 18 / 2026, page 20 / 48 3 / 4 6. Vehicle body frame structure for a saddle-mounted driving vehicle according to claim 5, characterized in that the fuel tank support (44) extends behind the cross member (42).

7. Vehicle body frame structure for a saddle-mounted riding vehicle, according to any one of claims 1 to 6, characterized in that the first reinforcement (35A) is placed on a rear side with respect to an intersection point (C1) of a first extension line (L1) imaginarily extending one of the rear frames (20A) forward and one of the main frames (31A), and the second reinforcement (35B) is placed on a rear side with respect to an intersection point (C2) of a second extension line (L2) imaginarily extending the other of the rear frames (20B) forward and the other of the main frames (31B).

8. Vehicle body frame structure for a saddle-mounted driving vehicle according to any one of claims 1 to 7, characterized in that the inner members (39b, 41b) have a plate shape and are located on an inner side with respect to the outer member the first reinforcement (35A) and the second reinforcement (35B) are each formed in a hollow plate shape.

9. Vehicle body frame structure for a saddle-mounted driving vehicle according to claim 8, characterized in that one of the rear frames (20A) is attached between the outer member (39a) and the inner member (39b), and the other of the rear frames (20B) is attached between the outer member (41a) and the inner member (41b).

10. Vehicle body frame structure for a saddle-mounted ride-on vehicle, according to claim 8 or 9, Petition 870260025108, dated 03 / 18 / 2026, page 21 / 48 4 / 4 characterized in that one of the main frames (31A) is attached between the outer member (39a) and the inner member (39b), and the other of the main frames (31B) is attached between the outer member (41a) and the inner member (41b).

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