Saddle-riding type vehicle

Abstract

To appropriately protect a gas tank from a component behind the tank.SOLUTION: A saddle-riding type vehicle travels using gas fuel. The saddle-riding type vehicle is provided with: a vehicle body frame (10) forming a framework of a vehicle body; and a gas tank (60) inside the vehicle body frame. The vehicle body frame includes: a pair of frame parts (17, 22) located on both sides of the gas tank; and a bridge part (81) connecting the pair of frame parts behind the gas tank. A fixing position of one end part of the bridge part and one of the frame parts is lower than a fixing position of the other end part of the bridge part and the other of the frame parts.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a saddle-type vehicle. [Background technology]

[0002] In recent years, fuel cell vehicles that run on electricity generated by a fuel cell have been developed. In fuel cell vehicles, hydrogen gas in a hydrogen tank and oxygen in the air undergo a chemical reaction in the fuel cell to generate electricity, and the generated electricity is supplied to a motor to drive the wheels. In addition to fuel cell vehicles, straddle-type vehicles equipped with gas-fueled engines that burn hydrogen gas as gas fuel and run using the combustion energy have also been developed (see, for example, Patent Document 1). In the straddle-type vehicle described in Patent Document 1, a gas tank is installed below the floorboard in front of the engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 04-283128 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned saddle-type vehicle, a protective member is sometimes provided to protect the gas tank from other parts when an impact is received from behind. However, various parts are installed behind the gas tank, and in order to protect the gas tank from these parts, the shape of the protective member becomes complicated, which is problematic in that the size of the vehicle tends to increase.

[0005] The present invention has been made in consideration of the above-mentioned points, and has an object to provide a saddle-type vehicle that can adequately protect the gas tank from parts behind the tank. [Means for solving the problem]

[0006] One embodiment of the present invention provides a saddle-type vehicle that runs on gas fuel, and includes a body frame that forms the skeleton of the vehicle body, and a gas tank inside the body frame, the body frame having a pair of frame portions located on either side of the gas tank, and a bridge portion that connects the pair of frame portions behind the gas tank, and the above-mentioned problem is solved by having a fixing position of one end of the bridge portion to one frame portion that is lower than a fixing position of the other end of the bridge portion to the other frame portion. Effect of the Invention

[0007] According to a saddle-type vehicle of one aspect of the present invention, the bridge portion crosses the rear of the gas tank diagonally so that one end of the bridge portion is lower than the other end. Even if multiple parts are lined up in the left-right or up-down direction behind the gas tank, the bridge portion is positioned between the multiple parts and the gas tank. When each part moves forward due to an impact from behind, the bridge portion protects the gas tank from each part. Therefore, the gas tank and each part are brought close to each other, and the gas tank and each part are installed compactly, thereby making it possible to reduce the size of the saddle-type vehicle. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a left side view of the vehicle internal structure of the present embodiment. [Diagram 2] FIG. 2 is a right side view of the vehicle internal structure of the present embodiment. [Diagram 3] FIG. 2 is a left side view of the center portion of the vehicle body of the present embodiment. [Figure 4] FIG. 2 is a top view of the center part of the vehicle body of the present embodiment. [Diagram 5] FIG. 2 is a rear view of the center portion of the vehicle body of the present embodiment. [Figure 6] FIG. 2 is a right side view of the center portion of the vehicle body of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A saddle-type vehicle according to one embodiment of the present invention runs on gas fuel. The framework of the vehicle body of the saddle-type vehicle is formed by a vehicle body frame, and a gas tank is installed inside the vehicle body frame. In the vehicle body frame, a pair of frame parts are located on the sides of the gas tank, and a bridge part connecting the pair of frame parts is located behind the gas tank. A fixing position of one end of the bridge part and one frame part is lower than a fixing position of the other end of the bridge part and the other frame part, and the bridge part diagonally crosses the rear of the gas tank. Even if multiple parts are lined up in the left-right direction or the up-down direction behind the gas tank, the bridge part is positioned between the multiple parts and the gas tank. When each part moves forward due to an impact from behind, the bridge part protects the gas tank from each part. Thus, the gas tank and each part are brought close to each other, and the gas tank and each part are installed compactly, thereby reducing the size of the saddle-type vehicle. EXAMPLES

[0010] Hereinafter, a saddle-type vehicle of this embodiment will be described with reference to the accompanying drawings. Fig. 1 is a left side view of the internal structure of the vehicle of this embodiment. Fig. 2 is a right side view of the internal structure of the vehicle of this embodiment. In the following drawings, the arrow Fr indicates the front of the vehicle, the arrow Re indicates the rear of the vehicle, the arrow L indicates the left side of the vehicle, and the arrow R indicates the right side of the vehicle.

[0011] As shown in Figures 1 and 2, a saddle-type vehicle 1 is configured by mounting various covers (not shown) as the exterior of the vehicle body to a body frame 10 that forms the skeleton of the vehicle body. A head pipe 11 is provided at the front end of the body frame 10, and a support frame 12 extends diagonally rearward and downward from an upper portion of the head pipe 11. A pair of first down frames 13 branch off to the left and right and extend downward from a lower portion of the support frame 12, and a pair of second down frames 14 branch off to the left and right and extend downward from a lower portion of the head pipe 11. A pair of main frames 15 are connected to the lower portions of the pair of first and second down frames 13, 14.

[0012] The pair of main frames 15 extend toward the rear of the vehicle, and their middle portions are connected by an upper bridge 16. A pair of asymmetrical side frames 17 extend downward from the front ends of the pair of main frames 15. Each side frame 17 is bent rearward under the vehicle and then extends diagonally upward and rearward toward the rear portions of the pair of main frames 15. The pair of main frames 15 and the pair of side frames 17 form the front half of the body frame 10 into a cradle shape. A pair of footboards 18 are attached to the pair of side frames 17.

[0013] A pair of seat frames 19 extend rearward from the rear portions of the pair of main frames 15. The distance between the pair of seat frames 19 increases toward the middle of each frame and then decreases toward the rear ends of each frame. The pair of seat frames 19 are formed in an arch shape, and the rear ends of the pair of seat frames 19 are connected to each other. The front portions of the pair of seat frames 19 are connected by an upper bridge 21. The rear portions of the pair of side frames 17 are connected to the upper bridge 21, and the upper bridge 21 is supported from below by the pair of side frames 17.

[0014] A pair of asymmetric lower frames 22 extend rearward from the lower portions of the pair of side frames 17. The rear ends of the pair of lower frames 22 are connected by a lower bridge 23. A left subframe 28 extends diagonally upward and rearward from the left end of the lower bridge 23, and the left subframe 28 supports the seat frame 19 from below. A side bridge 25 connects the right end of the lower bridge 23 to an intermediate portion of the right side frame 17. A right subframe 29 extends diagonally upward and rearward from the intermediate portion of the side bridge 25, and the right subframe 29 supports the seat frame 19 from below.

[0015] A front fork 33 is supported on the head pipe 11 so as to be steerable, and a front wheel 34 is supported rotatably on the lower part of the front fork 33. A long gas tank 60 is installed inside a cradle portion in the front half of the body frame 10. Gas fuel such as hydrogen is stored in the gas tank 60, and the inflow and outflow of the gas fuel is controlled by a tank valve 62 at the rear of the tank. The gas fuel is supplied from the tank valve 62 to an injector (not shown) above the unit swing engine (engine) 41 via fuel system components such as multiple pipes, a regulator 64, and a fuel hose 66.

[0016] A unit swing engine 41 is swingably supported on the support plates 31 of the left and right subframes 28, 29. The unit swing engine 41 is operated by combustion energy of gas fuel supplied from a gas tank 60. The cylinder axis of the unit swing engine 41 is tilted forward and close to horizontal, and a cylinder assembly 43 extends toward the front of the vehicle from a crankcase 42. The cylinder assembly 43 is inserted between the left subframe 28 and the right subframe 29, and the front end of the cylinder assembly 43 is brought close to a tank valve 62 of the gas tank 60.

[0017] Intake system parts such as an air cleaner 51 are connected to the upper part of the cylinder assembly 43, and exhaust system parts such as an exhaust pipe 56 and a muffler 58 are connected to the lower part of the cylinder assembly 43. A CVT cover 47 is attached to the left side of the crankcase 42. The rear wheel 35 is rotatably supported at the rear part of the CVT cover 47. A belt-type continuously variable transmission (not shown) is housed inside the CVT cover 47, and the driving force of the unit swing engine 41 is transmitted to the rear wheel 35 via the belt. The muffler 58, CVT cover 47, rear wheel 35, and unit swing engine 41 are all swung together.

[0018] Meanwhile, the saddle riding type vehicle 1 is provided with a protective member that protects the gas tank 60 from other parts when it receives an impact from behind. Behind the gas tank 60, not only the cylinder head cover 46 of the unit swing engine 41 but also the link mechanism 37 for the suspension 36 are provided. Because the link mechanism 37 is located below the cylinder head cover 46, a protective member that extends only in the left-right direction cannot adequately protect the gas tank 60. Therefore, in this embodiment, a protective bridge (bridge portion) 81 as a protective member is inclined obliquely with respect to the left-right direction, thereby effectively protecting the gas tank 60 from multiple parts lined up above and below.

[0019] The peripheral structure of the unit swing engine will be described with reference to Figures 3 and 4. Figure 3 is a left side view of the center part of the vehicle body of this embodiment. Figure 4 is a top view of the center part of the vehicle body of this embodiment.

[0020] 3 and 4, the cylinder assembly 43 of the unit swing engine 41 is formed by stacking a cylinder 44, a cylinder head 45, and a cylinder head cover 46. An intake system is installed above the cylinder head 45. The intake system includes an air cleaner 51, a U-shaped outlet tube 52, a throttle body 53, and an intake pipe 54. Air is sent from the air cleaner 51 through the outlet tube 52 to the throttle body 53, and after the intake amount is adjusted by the throttle body 53, the air is supplied to the intake port of the cylinder head 45 through the intake pipe 54.

[0021] An exhaust port is formed at the bottom of the cylinder head 45, and an exhaust pipe 56 serving as an exhaust device is connected to the exhaust port. The exhaust pipe 56 curves rearward from the bottom surface of the cylinder head 45, then passes along the right side of the crankcase 42 and extends toward the rear of the vehicle. A muffler 58 (see FIG. 2) inclined diagonally upward and rearward on the right side of the rear wheel 35 is connected to the rear end of the exhaust pipe 56. Exhaust gas flows into the exhaust pipe 56 from the exhaust port of the unit swing engine 41, flows rearward through the exhaust pipe 56, and is then discharged to the outside from the muffler 58.

[0022] A link mechanism 37 for the suspension 36 is provided below the cylinder head 45. The link mechanism 37 has a link lever 38 that is arc-shaped in a side view, and an intermediate portion of the link lever 38 is swingably connected to the link bracket 32 ​​of the body frame 10. An upper end portion of the link lever 38 is swingably connected to a lower portion of the crankcase 42 via a link arm 39, and a lower end portion of the link lever 38 is connected to a suspension bracket 75 of the body frame 10 via the suspension 36. The suspension 36 expands and contracts in accordance with the swing of the unit swing engine 41, thereby absorbing vibrations transmitted to the vehicle body.

[0023] A gas tank 60 is installed in front of the unit swing engine 41. A tank body 61 of the gas tank 60 is formed in a cylindrical shape, and both ends of the tank body 61 are bulged out in a semi-spherical shape. The longitudinal direction of the tank body 61 is oriented in the front-rear direction, and the tank body 61 is slightly tilted so that the front end of the tank body 61 is higher than the rear end. The gas tank 60 is supported on the lower part of the vehicle body frame 10 via a pair of front and rear tank brackets 71, 72. Bands 73, 74 are attached to the pair of tank brackets 71, 72, and the outer circumferential surface of the tank body 61 is fastened by the bands 73, 74.

[0024] A tank valve 62 is installed at the rear end of the tank body 61, and a regulator 64 is connected to a relief valve pipe 63 extending diagonally upward and rearward from the bottom of the tank valve 62. When the pressure of the gas fuel reaches or exceeds a predetermined pressure, the valve of the regulator 64 opens to adjust the pressure of the gas fuel. A fuel fill port 77 is installed at the top of the gas tank 60, and the top of the tank valve 62 is connected to a fill pipe 78 extending diagonally downward and rearward from the fuel fill port 77. Gas fuel is filled into the tank from the fuel fill port 77 through the tank valve 62. A radiator 30 for cooling the engine is installed in front of the gas tank 60.

[0025] An injector joint 68 is connected to the regulator 64 via an upstream pipe 65, a fuel hose 66, and a downstream pipe 67. The upstream pipe 65 and the downstream pipe 67 are formed of a hard pipe material such as metal, and the fuel hose 66 is formed of a soft rubber hose. The upstream pipe 65 crosses below the tank valve 62 and extends from the regulator 64 on the left side of the vehicle body to the right side of the vehicle body. On the right side of the vehicle body, the lower end of the fuel hose 66 is connected to the upstream pipe 65, and the fuel hose 66 extends upward through the right side of the gas tank 60. The upper end of the fuel hose 66 is connected to an injector joint 68 above the cylinder head 45 via the downstream pipe 67.

[0026] In this way, gas fuel is supplied from the tank valve 62 of the gas tank 60 through the relief valve pipe 63, the regulator 64, the upstream piping 65, the fuel hose 66, and the downstream piping 67 to the unit swing engine 41. A protective bridge 81 that connects the right lower frame 22 and the left side frame 17 is provided behind the tank valve 62. The protective bridge 81 extends obliquely so as to avoid the regulator 64 and the link mechanism 37. When the saddle riding type vehicle 1 receives an impact from behind, the protective bridge 81 protects the tank valve 62 from rear parts such as the link mechanism 37.

[0027] The protective structure for a gas tank will be described with reference to Fig. 5 and Fig. 6. Fig. 5 is a rear view of the center part of the vehicle body of this embodiment. Fig. 6 is a right side view of the center part of the vehicle body of this embodiment. Fig. 5 shows a state in which the unit swing engine, intake device, exhaust device, etc. have been removed. In the following description, the left side frame and lower frame are given the symbol L, and the right side frame and lower frame are given the symbol R.

[0028] As shown in Fig. 5, a pair of frame portions of the body frame 10 are located on both sides of the gas tank 60, and this pair of frame portions is formed asymmetrically by a pair of side frames 17L, 17R and a pair of lower frames 22L, 22R. The rear edge of the left side frame 17L rises rearward of the rear edge of the right side frame 17R, and the right lower frame 22R is formed longer in the front-rear direction than the left lower frame 22L (see Figs. 1 and 2). A protective bridge 81 that diagonally crosses the rear of the gas tank 60 is connected to the pair of frame portions.

[0029] More specifically, an L-shaped fixed plate 82 is provided at the right end of the protective bridge 81, and a vertical fixed plate 83 is provided at the left end of the protective bridge 81. The fixed plate 82 on the right end side of the protective bridge 81 is fixed to the right lower frame 22R, and the fixed plate 82 on the left end side of the protective bridge 81 is fixed to the raised rear edge portion of the left side frame 17L. The fixing position of the right end of the protective bridge 81 to the right lower frame 22R is lower than the fixing position of the left end of the protective bridge 81 to the left side frame 17L. The protective bridge 81 extends obliquely, thereby suppressing interference between the protective bridge 81 and the regulator 64 (see FIG. 3).

[0030] The protective bridge 81 is located between the gas tank 60 and the link mechanism 37, and the link mechanism 37 partially overlaps the intermediate position of the protective bridge 81 in rear view. The link mechanism 37 is brought closer to the protective bridge 81 in the front-to-rear direction, and the gas tank 60 and the link mechanism 37 are installed compactly. The rear surface of the intermediate position of the protective bridge 81 is recessed, and a recess 84 is formed along the extension direction of the protective bridge 81. By positioning the recess 84 of the protective bridge 81 in front of the link mechanism 37, interference between the protective bridge 81 and the link lever 38 is suppressed even if the link lever 38 of the link mechanism 37 swings.

[0031] In addition to the link mechanism 37, the cylinder head cover 46 (see FIG. 6) is also located behind the protective bridge 81, and the protective bridge 81 overlaps the link mechanism 37 and the cylinder head cover 46 in a rear view. Therefore, even if the link mechanism 37 or the cylinder head cover 46 moves forward due to an impact from behind, the link mechanism 37 and the cylinder head cover 46 are received by the protective bridge 81, protecting the gas tank 60. Therefore, the gas tank 60, the link mechanism 37, and the unit swing engine 41 can be compactly installed in the body frame 10, and the size of the saddle-type vehicle 1 can be reduced.

[0032] 6, the right (one) frame portion of the body frame 10 has a triangular frame 20 formed by a lower side portion extending forward and backward, a front oblique side portion extending diagonally upward and rearward from the front end of the lower side portion, and a rear oblique side portion extending diagonally upward and frontward from the rear end of the lower side portion. The lower side portion of the triangular frame 20 is formed by the right lower frame 22R, the front oblique side portion of the triangular frame 20 is formed by the right side frame 17R, and the rear oblique side portion of the triangular frame 20 is formed by the right side bridge 25. A fixing plate 82 on the right end side of a protective bridge 81 is fixed to the lower frame 22R which forms the lower side portion of the triangular frame 20.

[0033] The triangular frame 20 is formed with high rigidity, so that the triangular frame 20 is unlikely to deform even when subjected to an impact from behind. By fixing the protective bridge 81 to the triangular frame 20, displacement of the fixing position on the right end side of the protective bridge 81 is suppressed. In particular, by fixing the protective bridge 81 to the lower frame 22R, which has high rigidity in the front-rear direction, displacement of the fixing position on the right end side of the protective bridge 81 is effectively suppressed even when subjected to an impact from behind. Therefore, the protective bridge 81 protects the gas tank 60 from rear parts such as the link mechanism 37 and the cylinder head cover 46.

[0034] As shown in Fig. 3, to the left (other) frame portion of the body frame 10, the side frame 17L and the left subframe 28 are connected by a side bridge 26, and the side frame 17L and the main frame 15 are connected by a side bridge 27. The side bridges 26, 27 increase the rigidity of the side frame 17L, making it difficult for the side frame 17L to deform. By fixing the protective bridge 81 to the side frame 17L, displacement of the fixed position on the left end side of the protective bridge 81 is suppressed even when an impact or the like is received from behind, and the protective bridge 81 protects the gas tank 60 from various rear components.

[0035] As described above, according to the saddle riding type vehicle 1 of this embodiment, the protective bridge 81 crosses diagonally behind the gas tank 60 so that the right end of the protective bridge 81 is lower than the left end. Even if the link mechanism 37 and the cylinder head cover 46 are vertically arranged behind the gas tank 60, the protective bridge 81 is positioned between the link mechanism 37 and the cylinder head cover 46 and the gas tank 60. When the link mechanism 37 and the like move forward due to an impact from behind, the protective bridge 81 protects the gas tank 60 from the link mechanism 37 and the like. Therefore, the gas tank 60 and the link mechanism 37 and the like are brought close to each other, and the gas tank 60 and the link mechanism 37 and the like are arranged compactly, thereby making it possible to reduce the size of the saddle riding type vehicle 1.

[0036] In this embodiment, the triangular frame is formed on one frame portion of the vehicle body frame, but the frame shape of the vehicle body frame is not particularly limited. For example, the triangular frame may be formed on the other frame portion, or on both the left and right frame portions. In addition, the fixing point of the protective bridge to the triangular frame is also not particularly limited.

[0037] In addition, the triangular frames do not have to be formed on both the left and right frame portions, but it is preferable that the lower portion of one of the frame portions is formed by a lower frame and one end of the protective bridge is fixed to this lower frame.

[0038] In this embodiment, the fixing position of the right end of the protection bridge is lower than the fixing position of the left end of the protection bridge, but the fixing position of the right end of the protection bridge may be higher than the fixing position of the left end of the protection bridge. For example, the right end of the protection bridge may be fixed to the rear edge portion of the right side frame, and the left end of the protection bridge may be fixed to the left lower frame.

[0039] In addition, in this embodiment, the link mechanism and the cylinder head cover are positioned behind the protective bridge, but the components behind the protective bridge are not particularly limited. Other components, such as a regulator, may be positioned behind the protective bridge.

[0040] In addition, in this embodiment, a unit swing engine is exemplified as the engine, but the engine is not limited to a unit swing engine as long as it is operated by the combustion energy of gas fuel.

[0041] Further, in this embodiment, the engine is a hydrogen engine using hydrogen gas, but it may be another gas fuel engine using other gas fuel such as methane gas or propane gas.

[0042] Further, in this embodiment, a single gas tank is provided in the saddle riding type vehicle, but a plurality of gas tanks may be provided in the saddle riding type vehicle.

[0043] In addition, in this embodiment, the gas tank is formed into a cylindrical shape with both ends bulging out into a hemisphere, but the shape of the gas tank is not limited as long as the gas tank has a shape capable of storing gas fuel.

[0044] The protective bridge of the present embodiment is not limited to the above-mentioned saddle-ride type vehicle, and may be adopted in other types of saddle-ride type vehicles. Note that the saddle-ride type vehicle is not limited to all vehicles in which the rider sits astride the seat, but also includes scooter-type vehicles in which the rider does not sit astride the seat.

[0045] As described above, the first embodiment is a saddle-type vehicle (1) that runs on gas fuel, and includes a body frame (10) that forms the skeleton of the vehicle body, and a gas tank (60) inside the body frame. The body frame has a pair of frame parts (side frames 17L, 17R, lower frames 22L, 22R) located on both sides of the gas tank, and a bridge part (protective bridge 81) that connects the pair of frame parts behind the gas tank, and the fixed position of one end of the bridge part to one frame part is lower than the fixed position of the other end of the bridge part to the other frame part. According to this configuration, the bridge part diagonally crosses the rear of the gas tank so that one end of the bridge part is lower than the other end. Even if multiple parts are lined up in the left-right or up-down direction behind the gas tank, the bridge part is positioned between the multiple parts and the gas tank. When each part moves forward due to an impact from behind, the bridge part protects the gas tank from each part. This allows the gas tank and each component to be located close to each other, and the gas tank and each component can be arranged compactly, thereby making the saddle-type vehicle more compact.

[0046] In the second aspect, in the first aspect, a lower portion of one of the frame parts is formed by a lower side part extending in the front-rear direction, and one end part of the bridge part is fixed to the lower side part of the one of the frame parts. With this configuration, since the bridge part is fixed to the lower side part of the frame part having high rigidity in the front-rear direction, the lower side part is less likely to deform due to an impact from behind, etc., and it is possible to suppress displacement of the fixed position of the one end part of the bridge part.

[0047] In the third embodiment, in the first embodiment, one of the frame parts has a lower side part (lower frame 22R) extending forward and backward, a front oblique side part (side frame 17R) extending diagonally upward and rearward from the front end of the lower side part, and a rear oblique side part (side bridge 25) extending diagonally upward and frontward from the rear end of the lower side part to form a triangular frame (20), and one end of the bridge part is fixed to the triangular frame. With this configuration, since the bridge part is fixed to the highly rigid triangular frame, the triangular frame is less likely to deform due to impact from behind, etc., and displacement of the fixed position of the one end of the bridge part can be suppressed.

[0048] In the fourth aspect, in the third aspect, one end of the bridge part is fixed to the lower side of one of the frame parts. With this configuration, since the bridge part is fixed to the lower side of the frame part having high rigidity in the front-rear direction, the lower side is less likely to deform due to an impact from behind, etc., and it is possible to suppress displacement of the fixed position of the one end of the bridge part.

[0049] The fifth aspect is any one of the first to fourth aspects, and includes a suspension (36) that absorbs vibrations of the vehicle body and a link mechanism (37) for the suspension, with the link mechanism located behind the gas tank and a bridge portion located between the gas tank and the link mechanism. With this configuration, even if the link mechanism moves forward due to an impact from behind, the bridge portion protects the gas tank from the link mechanism. Therefore, the gas tank and the link mechanism can be installed compactly, and the size of the saddle-type vehicle can be reduced.

[0050] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0051] In addition, the technology of the present invention is not limited to the above examples, and may be modified, substituted, or altered in various ways without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to the progress of technology or a different technology derived therefrom, the invention may be implemented using that method. Therefore, the claims cover all embodiments that may be included within the scope of the technical idea. [Explanation of symbols]

[0052] 1: Saddle-type vehicle 10: Body frame 17: Side frame (frame part) 17R: Side frame (front oblique side) 20: Triangle frame 22: Lower frame (frame part) 22R: Lower frame (bottom part) 25: Side bridge (posterior oblique part) 36: Suspension 37: Link mechanism 60: Gas tank 81: Protective bridge (bridge section)

Claims

1. A saddle-type vehicle that runs on gas fuel, A body frame that forms the skeleton of the vehicle body; a gas tank inside the body frame, the vehicle body frame has a pair of frame portions located on either side of the gas tank, and a bridge portion connecting the pair of frame portions behind the gas tank, A saddle-type vehicle, characterized in that a fixed position between one end of the bridge portion and one of the frame portions is lower than a fixed position between the other end of the bridge portion and the other frame portion.

2. a lower portion of the one frame portion is formed by a lower side portion extending forward and backward; 2. The straddle-type vehicle according to claim 1, wherein one end of the bridge portion is fixed to a lower side portion of the one frame portion.

3. The one frame portion has a lower side portion extending forward and backward, a front oblique side portion extending diagonally upward and rearward from a front end of the lower side portion, and a rear oblique side portion extending diagonally upward and frontward from a rear end of the lower side portion, forming a triangular frame; 2. The straddle-type vehicle according to claim 1, wherein one end of the bridge portion is fixed to the triangular frame.

4. 4. The straddle-type vehicle according to claim 3, wherein one end of the bridge portion is fixed to a lower side portion of the one frame portion.

5. A suspension that absorbs vibrations from the vehicle body, a link mechanism for the suspension, The link mechanism is located behind the gas tank, 3. The straddle-type vehicle according to claim 1, wherein the bridge portion is located between the gas tank and the link mechanism.

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