JP4787065B2 - Vehicle fuel tank support structure - Google Patents

Description

  The present invention relates to an improvement in a fuel tank support structure for a vehicle.

As a conventional fuel tank support structure for a vehicle, a structure in which a fuel tank is attached to a vehicle body frame is known (see, for example, Patent Document 1).
JP 2003-312571 A

As shown in FIG. 1 of Patent Document 1, the fuel tank 30 is disposed below the first frame 35 extending obliquely downward from the head pipe 18 toward the rear of the vehicle body. The fuel tank 30 is attached to the lower portion of the first frame 35. The second frame 37 is covered.
Further, as shown in FIG. 4 of Patent Document 1, a footrest portion 122 on which a passenger puts his / her foot is formed integrally with the vehicle body cover 109.

In FIG. 4 of Patent Document 1, the body cover 109 is increased in size to form the footrest portion 122. In order to provide the footrest portion 122, it is necessary to increase the strength and reinforcement of the vehicle body cover 109, which increases the weight. If the footrest portion 122 can be assembled directly to the first frame 35 after being directly attached to the second frame 37 shown in FIG. 1 of Patent Document 1, the number of steps for assembling the frame parts can be reduced, and the work efficiency can be improved. In addition, the increase in the weight of the vehicle can be suppressed.
An object of the present invention is to reduce the weight of a vehicle.

The invention according to claim 1 extends a pair of left and right main frames from the head pipe to the rear of the vehicle body, attaches an engine to these main frames, attaches a swing arm to the engine so that it can swing freely, and attaches a rear end to the rear end of the swing arm. In a vehicle with wheels attached, a fuel tank for supplying fuel to the engine is disposed below the main frame and in front of the engine, and includes a tank mounting portion for mounting the fuel tank and a main frame mounting portion for mounting on the main frame. The fuel tank is supported by the tank support member, and the step of supporting the occupant's foot is supported by the tank support member. The tank support member includes a pair of left and right first underframes extending downward from the left and right main frames, and a fuel tank. The second doors attached to the left and right first underframes The second under frame is composed of a pair of left and right side frames arranged on both sides of the fuel tank, a lower frame arranged below the fuel tank and connecting the left and right side frames, and a fuel tank It is characterized by comprising a front frame that is disposed in front and passed to each end of the left and right side frames .

As an operation, the tank support member also serves as a step support member, and no special step support member is required.
Further , the fuel tank and the step are attached to the tank support member in advance, and the main frame attachment portion of the tank support member to which the fuel tank is attached is attached to the main frame on the assembly line.

In the present invention, as described above, the tank support member is attached to the pair of left and right first underframes extending downward from the left and right main frames, and to the left and right first underframes passing under the fuel tank. It consists of a second underframe .

Accordingly, the first under frame extends downward from the left and right main frames to strengthen the support of the second under frame. The second under frame passes under the tank to protect the lower part of the fuel tank.

Furthermore, as described above, the present invention provides a pair of left and right side frames in which the second under frame is disposed on both sides of the fuel tank, a lower frame that is disposed below the fuel tank and connects the left and right side frames, and a fuel. The front frame is arranged in front of the tank and is passed to the end portions of the left and right side frames.
Therefore, the rigidity of the second under frame is increased by connecting the pair of left and right side frames with the lower frame and the front frame.

The invention according to claim 2 is characterized in that a step support portion for extending the front frame to support the step is formed.
As an operation, by using the step support portion as an extended portion of the front frame, for example, a special attachment structure as in the case of a mounting structure for attaching a separate step support portion to the front frame is not required.

In the invention according to claim 1, first, a fuel tank for supplying fuel to the engine is disposed below the main frame and in front of the engine, and a tank mounting portion for mounting the fuel tank and a main frame mounting portion for mounting on the main frame The fuel tank is supported by a tank support member provided with a tank support member, and the step of supporting the occupant's foot is supported by the tank support member. Since the assembly of the vehicle body frame side including the tank support member can be performed continuously, the work efficiency of the assembly of the fuel tank and the step can be improved, and the step support specially supporting the step A member is not required and the weight of the vehicle can be reduced.

Next, according to the present invention, the tank support member includes a pair of left and right first underframes extending downward from the left and right main frames, respectively, and a second underframe attached to the left and right first underframes through the lower side of the fuel tank. Therefore, the second underframe can be firmly supported by the pair of left and right first underframes, and the fuel tank can be reliably supported by the second underframe. Further, since the first under frame passes under the fuel tank, the tank guard function can be exhibited by the first under frame.

  Further, the frame rigidity can be changed by changing the shape and material of each of the first underframe and the second underframe. For this reason, it can be set as the vehicle body corresponding to various specifications, without changing a main frame.

Further, according to the present invention, the second under frame is provided with a pair of left and right side frames disposed on both sides of the fuel tank, a lower frame disposed below the fuel tank and connecting the left and right side frames, and the front of the fuel tank. Since it is composed of a front frame that is arranged and passed to each end of the left and right side frames, the pair of left and right side frames are connected by the lower frame and the front frame. The fuel tank can be firmly supported.

In the invention according to claim 2, since the step support portion for extending the front frame to support the step is formed, the step support structure can be simplified, and the cost can be reduced by reducing the number of parts. .

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a vehicle adopting a fuel tank support structure according to the present invention. A vehicle 10 has an engine 12 attached to a central portion of a body frame 11 and a swing arm 13 attached to the engine 12 so as to freely swing up and down. A motorcycle in which a rear wheel 14 is attached to the rear end of the swing arm 13, a front fork 17 is steerably attached to a head pipe 16 constituting the front end of the body frame 11, and a front wheel 18 is attached to the lower end of the front fork 17. It is.

  The vehicle body frame 11 includes a head pipe 16, a pair of left and right cast main frames 21 and 22 (only the reference numeral 21 on the front side is shown) extending from the head pipe 16 obliquely downward to the rear of the vehicle, and these main frames 21. , 22 and a pair of left and right seat rails 23, 24 (only the reference numeral 23 on the front side is shown).

  The main frames 21 and 22 are aluminum alloy casting members, and various methods such as sand casting or die casting can be applied. The main frames 21 and 22 are attached to the head pipe 16 with bifurcated arm portions 26 and 27, respectively, A recess 28 is formed so that the driver can easily straddle, a front support part 33 and a rear support part 34 to which a tank support member 32 for supporting the fuel tank 31 is attached, and a window part 36 in which an air cleaner 35 is disposed, A stand mounting portion 37 for attaching a side stand is provided on the (left main frame 21). The tank support member 32 constitutes a part of the vehicle body frame 11.

The engine 12 includes a cylinder portion 41 inclined forward, and an intake device 43 and an exhaust device 44 are attached to a cylinder head 42 provided in the cylinder portion 41.
The configuration of the intake device 43 will be described in detail later.
The exhaust device 44 includes an exhaust pipe 46 having one end attached to the lower surface side of the cylinder head 41 and a muffler 47 attached to the other end of the exhaust pipe 46.

The swing arm 13 includes a left arm 53 and a right arm 54 that are swingably attached to a crankcase 51 on the engine 12 side via a pivot shaft 52. A rear wheel is provided at the rear end of each of the left arm 53 and the right arm 54. 14 is installed.
The left arm 53 incorporates a continuously variable transmission, and the right arm 54 is a bar made of aluminum alloy casting.

  The pivot shaft 52 of the swing arm 13 described above is provided coaxially with the crankshaft 56 of the engine 12, and with this structure, the swing type in which the engine and the continuously variable transmission are provided integrally. Compared to the power unit, the unsprung weight on the rear wheel 14 side can be reduced.

  Further, since the inertial force of the crankshaft 56 and the external force from the rear wheel 14 to the pivot shaft 52 via the swing arm 13 are input to the main frames 21 and 22 via the engine 12 from the same position, The reinforcement part 22 is only the attachment part to the main frames 21 and 22 of the engine 12, and the reinforcement material which reinforces the main frames 21 and 22 decreases, and the weight reduction of the main frames 21 and 22 can be achieved. .

The main frames 21 and 22 are connected to the left arm 53 by a rear cushion unit 61, a storage box 62 is disposed behind the rear cushion unit 61 in the vehicle, and a tandem seat 63 is disposed above the air cleaner 35 and the storage box 62. Arranged.
The tandem seat 63 includes a driver seat 65 and a passenger seat 66.

  Here, 71 is a front cowl, 72 is a wind screen, 73 is a bar handle, 74 is a full-face helmet stored in a storage box 62, 76 is a rear cover, and 77 is a rear fender.

FIG. 2 is a side view showing a vehicle body frame, an engine, a rear cushion unit and a swing arm according to the present invention (the arrow (FRONT in the figure indicates the front of the vehicle; the same applies hereinafter)), and main frames 21 and 22 (front side). The reference numeral 21 on the side shows only the lower first support parts 21a and 22a (only the reference numeral 21a on the front side) and the lower second support parts 21b and 22b (on the front side). And upper support portions 21c and 22c (only the front side symbol 21c is shown), and lower first support portions 21a and 22a, lower second support portions 21b and 22b, and upper support portion 21c. , 22c with the bolts 81, 82, 83, respectively.
Since the main frames 21 and 22 are made of casting, there is no welded portion like a pipe frame, so that productivity can be improved and the shape can be freely set with a mold.

  A line segment connecting the head pipe 16 and the crankshaft 56, that is, perpendicular to the axis 85 of the head pipe 16 and from the head pipe 16 (specifically, a point 85a on the axis 85) to the axis 86 of the crankshaft 56 (the axis 86) A line segment 87 extending to a point) extends substantially along the cylinder axis 88 of the engine 12. In other words, the main frames 21 and 22 extend substantially along the cylinder shaft 88.

  When the crankshaft 56 rotates, the gyroscopic action of the rotating body composed of the crankshaft 56 and parts rotating together with the crankshaft 56 (the shaft always indicates a constant direction, or an axis orthogonal to the crankshaft 56 (here, a vertical axis) ) A gyro moment is generated around an axis (corresponding to the line segment 87 here) orthogonal to both the axis and the crankshaft 56 when a rotational force is applied from the outside around.

  When the front wheel 18 (see FIG. 1) is steered when the vehicle is turning, a torsional force acts on the head pipe 16 from the front wheel 18 via the front fork. Therefore, when the crankshaft 56 side is stationary by the gyro effect, On the other hand, the head pipe 16 side is twisted.

  Further, when the vehicle body is turned, a rotational force acts on a vertical axis orthogonal to the rotating crankshaft 56, and a gyro moment is generated around the line segment 87. The shaft 56 side is twisted.

  As a result, the main frames 21 and 22 are twisted. However, since the main frames 21 and 22 are arranged on the line segment 87, the main frames 21 and 22 are not easily twisted.

  For example, when the central portion of the main frame is offset on the line segment 87, the entire length of the main frame is increased, and the main frame is likely to be twisted. Further, if the torsional rigidity of the main frame is increased, the weight of the main frame is increased.

  Further, since the main frames 21 and 22 are not easily twisted, the thickness of the main frames 21 and 22 can be reduced, and the weight of the main frames 21 and 22 can be reduced.

  Further, since the main frames 21 and 22 extend substantially along the cylinder shaft 88 and the main frames 21 and 22 and the cylinder portion 41 overlap in a side view, the moments of inertia around the main frames 21 and 22 and the engine line segment 87 are reduced. The twist of the main frames 21 and 22 can be further reduced.

  The rear cushion unit 61 has an upper end 61 a attached to the main frames 21, 22, specifically, a cross member (not shown) that passes between the main frames 21, 22, and a lower end 61 b that is the inner side surface and the side surface of the left arm 53. It is attached to a lower cushion mounting portion (not shown) provided on a line segment 93 connecting the crankshaft 56 (specifically, the axis line 86) and the axle 91 of the rear wheel 14 (specifically, the axis line 92 of the axle 91). It is a part.

  In the left arm 53, a V-belt type continuously variable transmission and a speed reduction mechanism are built in, and a shift is performed between an input pulley arranged coaxially with the crankshaft 56 and an output pulley arranged near the rear wheel 14. The power is transmitted to the speed reduction mechanism by the centrifugal clutch disposed coaxially with the output pulley and decelerated, and then the output is transmitted to the rear wheel 14.

  As described above, the lower end of the rear cushion unit 61 is disposed on the line segment 93 connecting the crankshaft 56 and the axle 91 of the rear wheel 14, so that details between the crankshaft 56 and the axle 91 of the rear wheel 14 are described in detail. The space between the engine 12 and the rear wheel 14 can be used effectively.

  FIG. 3 is a rear view showing the main frame, the swing arm and the rear cushion unit according to the present invention. The pair of left and right main frames 21 and 22 are respectively provided with inward projecting portions 96 and 97 projecting inwardly at the rear portions. A member in which a cross member 98 is attached to the inward projecting portions 96 and 97 is attached.

  The cross member 98 is a member provided with an upper cushion mounting portion 102 (consisting of left and right projecting portions 102a and 102b) offset to the left from the vehicle width center line 101, and the rear cushion unit 61 is provided with an upper cushion mounting portion. An upper end 61 a is attached to the part 102 with a bolt 103 and a nut 104, and a lower end 61 b is attached to the lower cushion attaching part 106 provided on the left arm 53 of the swing arm 13 with a bolt 107.

  As described above, the rear cushion unit 61 is arranged by being offset by the offset amount D on the left side with respect to the vehicle width center line 101, whereby the space in the center of the vehicle width can be used effectively.

  Further, since the rear cushion unit 61 is disposed on the center side in the vehicle width direction with respect to the left arm 53 of the swing arm 13, the mass of the rear cushion unit 61 is set in the vehicle width direction together with the mass of the engine 12 (see FIG. 2). It can be concentrated on the center side.

  FIG. 4 is a side view of an essential part showing an engine and an intake device according to the present invention. The intake device 43 shows a pair of left and right intake pipes 111 and 112 (reference numeral 111 on the front side) attached to the upper surface of the cylinder head 42. ), A pair of left and right throttle bodies 113 and 114 connected to the rear ends of these intake pipes 111 and 112 (only the reference numeral 113 is shown on the front side), and intake air connected to the rear ends of these throttle bodies 113 and 114 A box 116, a pair of left and right connecting tubes 117, 118 (only the reference numeral 117 shown on the front side) connected to the left and right side surfaces of the intake box 116, and an air cleaner 35 (connected to the tips of these connecting tubes 117, 118) The air cleaner 35 includes a pair of left and right air cleaners 35A and 35B indicated by a two-dot chain line. ) It becomes from the one in which is arranged below the driver's seat 65 (see FIG. 1). In addition, 121 and 121 (only the code | symbol 121 of the near side is shown) is a fuel injection valve attached to the intake pipes 111 and 112.

  The intake pipes 111 and 112, the throttle bodies 113 and 114, the intake box 116, and the connecting tubes 117 and 118 are components that constitute the intake passage 123 of the intake device 43.

  As shown in the figure, the intake passage 123 is provided at a position overlapping the air cleaners 35A and 35B in a side view, whereby the intake passage 123 can be shortened and the intake resistance can be reduced.

FIG. 5 is a side view showing an air intake apparatus according to the present invention, in which a part of an air cleaner 35A is broken to show the inside.
The air cleaner 35A has an intake duct 125 that introduces air from the outside to the inside at the front lower part of the inside, an intake port 126 that faces the outside is provided at the lower end of the intake duct 125, and is substantially rearward of the inner center. An air cleaner element 127 is arranged on the side, and a connecting tube 117 is connected to the rear surface of the air cleaner element 127. The air cleaner 35B (not shown) has the same basic structure as the air cleaner 35A, and a description thereof will be omitted.

  The intake box 116 includes a main body portion 116A connected to left and right connecting tubes 117, 118 (only the front side reference numeral 117 is shown), and a cover portion 116B that closes an opening of the main body portion 116A.

  6 is a cross-sectional view taken along line 6-6 in FIG. 5. The air cleaner 35A includes an air cleaner case 131 and an air cleaner element 127 disposed in the air cleaner case 131. The air cleaner case 131 includes a case main body 133, The case cover 134 closes the opening of the case body 133.

  The case main bodies 133 and 133 are parts inserted into the window portions 36 and 36 of the main frames 21 and 22, respectively, and in order to connect the connecting tubes 117 and 118, the rear portions are recessed portions 136 and 136, and these recessed portions 136 and 136 are connected. And connection holes 137 and 137 opened at the bottom of 136.

  The widths of the case main bodies 133 and 133 are substantially equal to the widths of the main frames 21 and 22, and most of the case main bodies 133 and 133 can be arranged in the window portions 36 and 36. Reference numeral 138 denotes a main body side protruding portion that protrudes from the bottom surface side of the case main body 133.

  Thus, by arranging the air cleaners 35A and 35B in the windows 36 and 36, the space in the vehicle width direction of the main frames 21 and 22 can be effectively used for the arrangement of the air cleaners 35A and 35B.

  The case cover 134 is a part to which the intake duct 125 is attached. The outer shape of the case cover 134 is larger than that of the window portion 36 and is arranged on the outer side of the outer surfaces 21A and 22A of the main frames 21 and 22.

  Thus, by projecting the case covers 134, 134 of the air cleaners 35A, 35B outward from the outer surfaces 21A, 22A of the main frames 21, 22, the volume of the air cleaners 35A, 35B can be increased. The required capacity can be easily secured.

  Reference numeral 141 denotes a cover-side protruding portion that protrudes from the case cover 134. By fastening the cover-side protruding portion 141 and the main body-side protruding portion 138 with a screw 143, the case cover 134 is attached to the case main body 133, and an air cleaner The stay 145 provided on the element 127 is fastened together. Reference numeral 146 denotes a nut attached to the main body side protruding portion 138 and is screwed to the screw 143.

The air cleaner element 127 is a component that includes a cylindrical connection portion 147 at one end, and is connected to the connection portions 147 and 147 by covering the ends of the connecting tubes 117 and 118, respectively.
The intake box 116 is integrally provided with cylindrical connection portions 151 and 152 on the left side surface 116L and the right side surface 116R, respectively, and the ends of the connecting tubes 117 and 118 are connected to these connection portions 151 and 152, and a band 153 and 154 is a container fastened at 154, and is attached to the front wall 156 with discharge pipes 157, 158 having one end gradually enlarged in diameter.

  The throttle bodies 113 and 114 have the same structure, and each has a body portion 161, an air passage 162 opened in the body portion 161, a throttle valve 163 that opens and closes the air passage 162, and the throttle valve 163 rotates. Therefore, a throttle shaft 164 that is rotatably attached to the body portion 161 is provided.

The air passages 162 and 162 are portions that communicate with the exhaust pipes 157 and 158 of the intake box 116.
The throttle shaft 164 is attached to both throttle valves 163 of the throttle bodies 113 and 114 with screws 166 and 166, respectively.

  The intake pipes 111 and 112 have the same structure. One end of each of the intake pipes 111 and 112 is connected to the throttle bodies 113 and 114 via a tubular joint member 171 so as to communicate with the air passage 162, and a flange 172 provided at the other end is connected to the cylinder. It is a part attached to the head 42 with two screws 173 and 173.

  As shown in the figure, air cleaners 35A and 35B are disposed on both sides of the cylinder portion 41 and on both lower sides of the driver seat 65, and the air intake box 116, the throttle body 113, and the air cleaner 35A and 35B are disposed between the air cleaners 35A and 35B. By arranging 114 and intake pipes 111 and 112, the intake device 43 can be made compact, and the vehicle can be downsized and the space of the vehicle body can be used effectively. Further, the overall length of the intake passage 123 connecting the cylinder head 42 and the air cleaners 35A, 35B can be shortened, and the intake resistance can be reduced.

  FIG. 7 is a side view (partial cross-sectional view) of a main part of the rear portion of the vehicle according to the present invention. The front wall 176 of the storage box 62 is formed in a shape along the rear cushion unit 61, and the rear cushion unit 61 and the storage box are formed. 62. Thereby, the vehicle body longitudinal length can be reduced by reducing the distance between the rear cushion unit 61 and the storage box 62 in the longitudinal direction.

  Further, the upper end portion 61 a of the rear cushion unit 61 is attached to the rear end portion of the main frames 21 and 22 and is disposed below the boundary between the driver seat 65 and the passenger seat 66 of the tandem seat 63. Therefore, the driver who is seated on the driver's seat 65 receives information from the road surface transmitted in the form of vibration or the like from the rear wheel 14 to the main frames 21 and 22 via the swing arm 13 (see FIG. 2) and the rear cushion unit 61. It becomes easy to detect and the road surface condition can be grasped more reliably.

  The storage box 62 is a container in which the cross section of the front wall 176 and the cross section of the bottom wall 178 are formed in a substantially V shape, and the front portion 74a (transparent shield portion 74b and the shield portion 74b of the full face helmet 74). It is convenient to store the upper portion 74c and the lower portion 74d below the shield portion 74b) against the front wall 176 and the bottom portion 74e against the bottom wall 178. The front wall 176 of the storage box 62 is along the shield surface as the front surface of the shield part 74b.

FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. The front wall 176 facing the rear cushion unit 61 of the storage box 62 is retracted along the outer shape of the rear cushion unit 61 and stored in the storage box 62. The center axis 180 in the width direction of the full-face helmet 74 is perpendicular to the vehicle body center line 182 (the vehicle width center line 101 (see FIG. 3) described above) extending in the front-rear direction so that the front side is positioned to the right of the rear side. In order to store the full-face helmet 74 so as to be inclined at an angle θ relative to the line), the right side of the front wall 176 bulges diagonally forward and rightward, and the bulged front wall 176 is It shows having formed in the shape along the shield part 74b of the full face type | mold helmet 74, the upper part 74c, and the lower part 74d (refer FIG. 7). The storage box 62 can be disposed in the vicinity of the rear cushion unit 61 while avoiding the rear cushion unit 61, whereby the large full-face helmet 74 can be efficiently stored in the small storage box 62.
The shield surface may be further tilted by an angle θ toward the rear of the vehicle body.

  FIG. 9 is a side view of the main part of the fuel tank support structure according to the present invention. A pair of left and right first underframes 191 and 192 (only the reference numeral 191 on the front side is shown) and a side view J attached to the lower portions of the left and right first underframes 191 and 192 passing under the fuel tank 31. This is a member comprising a second underframe 193 having a letter shape, and the lower portion of the flange portion 31a of the fuel tank 31 being attached to the back surface of the second underframe 193 with bolts 195 and 195 (only the reference numeral 195 on the front side is shown). . Note that 193a and 193a (only the reference numeral 193a on the front side is shown) are screws formed on the back surface of the second under frame 193 for screwing the bolts 195 and 195.

  The fuel tank 31 is attached with a bolt 198 to a cross member 197 having the upper portion of the flange portion 31a passed to the main frames 21 and 22 from side to side. In addition, 191A and 192A (only the reference numeral 191A on the front side is shown) is a frame front provided at one end of the first underframes 191 and 192 to be attached to the front support portion 33 (see FIG. 1) of the main frames 21 and 22. Part mounting portions 191B and 192B (only the front side reference numeral 191B is shown) are provided at the other ends of the first underframes 191 and 192 for mounting on the rear support portions 34 (see FIG. 1) of the main frames 21 and 22. 194 is a fuel pump built in the fuel tank 31, 196 is a filler cap that closes the filler port, and a plurality of 199 are the frame front mounting portions 191A and 192A and the frame rear mounting portions 191B and 192B. 22 is a bolt insertion hole through which a bolt to be attached to 22 is passed.

The tank support member 32 is also a member that supports a pair of left and right steps 201 and 202 (only the reference numeral 201 on the near side is shown) on which the driver places his / her foot.
Step 201 includes a footrest plate 204 and a side plate 205 raised from the inner edge of the footrest plate 204, and the rear portion of the side plate 205 is attached to the rear side surface of the first underframe 191 with two screws 206 and 206. The center portion of the side plate 205 is attached to the side surface of the second under frame 193 with screws 207, and the footrest plate 204 is attached to the front frame 211 and the step attachment frame 212 of the second under frame 193, which will be described in detail later. It is a part installed in

  FIG. 10 is a plan view of a principal part showing a fuel tank support structure according to the present invention. First underframes 191 and 192 are arranged on the left and right sides of the fuel tank 31, and the first underframes 191 and 192 are arranged below the first underframes 191 and 192. 2 shows that a pair of left and right steps 201 and 202 are attached to the first underframe 191, 192 and the second underframe 193.

  The second under frame 93 includes a pair of left and right side frames 215 and 216 disposed on both sides of the fuel tank 31, and a lower frame 217 disposed below the fuel tank 31 and connecting the left and right side frames 215 and 216. The front frame 211 is attached to each end of the left and right side frames 215 and 216 and attached to the end portions of the left and right side frames 215 and 216. This is a member obtained by extending 212.

  Step 202 includes a footrest plate 224 and a side plate 225 raised from the inner edge of the footrest plate 224, and the rear portion of the side plate 225 is attached to the rear side surface of the first underframe 192 with two screws 206 and 206. The center part of the side plate 225 is attached to the side surface of the second under frame 193 with screws 207, and the footrest plate 224 is attached to the front frame 211 and the step mounting frame 212 of the second under frame 193 with screws 208 and 208, respectively. is there.

  The footrest plates 204 and 224 of steps 201 and 202 are each divided into a front step 231 and a rear step 232 in the front-rear direction, and the left extension is provided integrally with the front frame 211 at the rear end of the front step 231. It is attached to the part 211a and the right extension part 211b, and the intermediate part of the rear step 232 is attached to the step attachment frames 212 and 212.

  1, 9 and 10, in order to attach the fuel tank 31 to the main frames 21, 22, first, the flanges 31a of the fuel tank 31 are fastened to the female screws 193a, 193a of the first under frame 193 with bolts 195, 195. Install the bottom of the.

  Next, the frame front mounting portions 191A and 192A of the first under frames 191 and 192 are mounted on the front support portions 33 of the main frames 21 and 22, and the frame rear mounting portions 191B and 192B of the first under frames 191 and 192 are mounted. The upper part of the flange part 31 a of the fuel tank 31 is attached to the cross member 197 of the main frames 21, 22 with bolts 198.

  Conventionally, for example, a fuel tank is attached to the lower part of the vehicle body frame, and then an underframe that covers the lower portion of the fuel tank is attached. The assembly to the lower part of the body frame is difficult to assemble compared to the work to assemble from the upper part of the body frame. Further, when the step is provided on the vehicle body cover, the vehicle body cover is enlarged and the weight increases due to reinforcement.

In the present invention, the fuel tank 31 is assembled to the tank support member 32 in an easy-to-assemble state, and then attached to the main frames 21 and 22 as one member. As a result, the working efficiency can be improved.
Furthermore, since the steps 201 and 202 are supported by the tank support member 32, a stay or the like for supporting the steps 201 and 202 becomes unnecessary, and the vehicle body cover can be reduced in size and weight.

  As shown in FIGS. 1, 9, and 10, the present invention extends a pair of left and right main frames 21 and 22 from the head pipe 16 toward the rear of the vehicle body, and attaches the engine 12 to these main frames 21 and 22. In the vehicle 10 in which the swing arm 13 is swingably attached to the engine 12 and the rear wheel 14 is attached to the rear end of the swing arm 13, a fuel tank 31 that supplies fuel to the engine 12 is connected to the main frames 21 and 22. A female screw 193a of the second underframe 193 as a tank mounting portion for mounting the fuel tank 31 and a front portion of the frame as a main frame mounting portion to be mounted on the main frames 21 and 22 are disposed below and in front of the engine 12 191A, 192A and frame rear mounting portions 191B, 192B The fuel tank 31 is supported by the link supporting member 32, the passenger in the tank support member 32 is equal to or in support of steps 201 and 202 to place the foot.

  Thus, the tank support member 32 can be attached to the main frames 21 and 22 in a state where the fuel tank 31 and the steps 201 and 202 are attached to the tank support member 32 in advance, and the vehicle body frame 11 including the tank support member 32 is included. As a result, the assembly efficiency of the fuel tank 31 and the steps 201 and 202 can be improved, and a step support member that specially supports the steps 201 and 202 is not required. 10 can be reduced in weight.

  The present invention also includes a pair of left and right first underframes 191 and 192 that extend the tank support member 32 downward from the left and right main frames 21 and 22, respectively, and the left and right first underframes passing under the fuel tank 31. It is characterized by comprising a second underframe 193 attached to the frames 191 and 192.

  Accordingly, the second underframe 193 can be firmly supported by the pair of left and right first underframes 191 and 192, and the fuel tank 31 can be reliably supported by the second underframe 193. In addition, since the first underframes 191 and 192 pass below the fuel tank 31, the first underframes 191 and 192 can exhibit the tank guard function.

  Further, by changing the shape and material of each of the first underframes 191 and 192 and the second underframe 193, the frame rigidity can be changed. For this reason, it can be set as the vehicle body corresponding to various specifications, without changing the main frames 21 and 22. FIG.

  Further, according to the present invention, the second under frame 193 is disposed below the fuel tank 31 and the left and right side frames 215 and 216 are connected to the pair of left and right side frames 215 and 216 disposed on both sides of the fuel tank 31. And a front frame 211 that is disposed in front of the fuel tank 31 and extends in the vehicle width direction to the ends of the left and right side frames 215 and 216.

  Accordingly, since the pair of left and right side frames 215 and 216 are connected by the lower frame 217 and the front frame 211, the rigidity of the second under frame 193 can be increased and the fuel tank 31 is firmly supported. be able to.

Furthermore, the present invention is characterized in that the front frame 211 is extended to form a left extension portion 211a and a right extension portion 211b as step support portions for supporting the steps 201 and 202.
Thereby, the step support structure can be simplified, and the cost can be reduced by reducing the number of parts.

  The fuel tank support structure of the present invention is suitable for a two-wheeled vehicle.

1 is a side view of a vehicle that employs a fuel tank support structure according to the present invention. It is a side view showing a body frame, an engine, a rear cushion unit, and a swing arm according to the present invention. It is a rear view which shows the main frame, swing arm, and rear cushion unit which concern on this invention. It is a principal part side view which shows the engine and intake device which concern on this invention. It is a side view which shows the intake device which concerns on this invention. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is a principal part side view (partial sectional view) of a vehicle rear part according to the present invention. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. It is a principal part side view which shows the fuel tank support structure which concerns on this invention. It is a principal part top view which shows the fuel tank support structure which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 12 ... Engine, 13 ... Swing arm, 14 ... Rear wheel, 16 ... Head pipe, 21, 22 ... Main frame, 31 ... Fuel tank, 32 ... Tank support member, 191, 192 ... First underframe, 191A, 191B, 192A, 192B ... main frame mounting portion, 193 ... second under frame, 193a ... tank mounting portion (female thread), 201, 202 ... step, 211 ... front frame, 211a, 211b ... step support portion (left) Extension part, right extension part), 215, 216 ... side frame, 217 ... lower frame.

Claims (2)

A pair of left and right main frames (21, 22) are extended from the head pipe (16) to the rear of the vehicle body, and an engine (12) is attached to these main frames (21, 22) , and a swing arm is swingable on the engine (12). (13) is attached, and the rear arm (14) is attached to the rear end of the swing arm (13) .
Fuel tank (31) for supplying fuel to the engine (12), while disposed in front of and said engine below said main frame (21, 22) (12), a tank mounting the fuel tank (12) mounting portion and the supporting the fuel tank (31) in the tank supporting member and a main frame mounting portion for mounting to the main frame (32), the step of placing said tank support member (32) occupant feet (201, 202 ) to support the,
The tank support member (32) passes through a pair of left and right first underframes (191, 192) extending downward from the left and right main frames (21, 22) and below the fuel tank (31). A second underframe (193) attached to the left and right first underframes (191, 192);
The second under frame (193) includes a pair of left and right side frames (215, 216) disposed on both sides of the fuel tank (31) and a lower side of the fuel tank (31) and the left and right side frames. A lower frame (217) connecting the frames (215, 216), and a front frame (211) disposed in front of the fuel tank (31) and passed to each end of the left and right side frames (215, 216) Composed of
A fuel tank support structure for a vehicle. The fuel tank support structure for a vehicle according to claim 1, wherein the front frame (211) is extended to form step support portions (211a, 211b) for supporting the steps (201, 202) .

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