JP6231270B2 - Saddle type vehicle fuel tank mounting structure - Google Patents

Description

  The present invention relates to an attachment structure for a fuel tank attached to a vehicle body frame in a saddle-ride type vehicle such as a motorcycle or a rough terrain vehicle.

  Conventionally, for example, a structure for mounting a fuel tank to a vehicle body frame in a motorcycle has been provided with a front mounting bracket and a rear mounting bracket projecting forward and rear at the front end and rear end of the fuel tank, respectively. The part mounting bracket and the rear mounting bracket are connected to the main frame of the vehicle body frame by bolting, inserting, or the like. In many cases, the main frame has a pair of left and right frame pieces that are connected to the head pipe at the front end and extend in the front-rear direction of the vehicle body. The front mounting bracket and the rear mounting bracket span the pair of left and right frame pieces. It is connected to a mounting portion provided on the cross member by an insertion piece or a bolt. This fuel tank mounting structure has an advantage that the fuel tank can be firmly supported by the vehicle body. However, since it is necessary to provide a cross member for connecting the front mounting bracket and the rear mounting bracket, the presence of this cross member makes it possible to design the equipment layout and the seat mounting height around the fuel tank. The degree of freedom is limited.

  Therefore, a fuel tank mounting structure that can support the rear part of the fuel tank on the vehicle body frame without using a cross member has been proposed (see Patent Document 1). In this attachment structure, both sides of the rear part of the fuel tank are attached to the left and right frame pieces of the main frame by rubber bands, respectively. The front end of the fuel tank is fixed to a cross member that connects the left and right front pipes with bolts.

JP-A-5-319342

  However, since the fuel tank mounting structure of Patent Document 1 uses a rubber band, the structure becomes complicated and the assemblability also deteriorates, for example, a hook for locking the rubber band is required.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fuel tank mounting structure for a straddle-type vehicle that can be easily mounted on a vehicle body frame without using a cross member with a simple configuration. To do.

  In order to achieve the above object, a fuel tank mounting structure for a saddle-ride type vehicle according to the present invention is a mounting structure for mounting a fuel tank on an upper part of a vehicle body frame, and includes a pair of left and right mounting portions provided on the vehicle body frame. A pair of left and right mounting flanges provided from the rear end of the fuel tank to 1/4 to 1/2 of the front-rear length of the tank, and the mounting flange is provided on the mounting flange and the mount portion. Fastened by a fastening member inserted from the outside

  According to this fuel tank mounting structure, the rear part of the fuel tank is provided with a pair of left and right mounting flanges provided at a position of 1/4 to 1/2 of the longitudinal length from the rear end, and a pair of left and right mounting flanges are provided on the body frame. Since it is attached to the vehicle body frame by being fixed to the mount portion, a cross member for supporting the rear portion of the fuel tank becomes unnecessary. As a result, the degree of freedom in design such as the arrangement of equipment around the fuel tank and the seat mounting height is improved. Further, since the fuel tank is attached to the vehicle body frame by inserting a fastening member through the attachment flange and the mount portion of the vehicle body frame, the attachment structure is simplified. Furthermore, since the fastening member is inserted into the mounting flange and the mount part from the outside without any obstacles in the periphery, the assemblability is improved. Further, since the mounting flange is provided at a position in front of the rear end of the fuel tank by 1/4 to 1/2 of the longitudinal length of the tank, more than half of the load load on the fuel tank is applied to the mounting flange. Therefore, the front mounting structure of the fuel tank can be simplified, for example, a structure in which only a pin is inserted.

  In the present invention, it is preferable that a rear grommet made of an elastic body is interposed between the mounting flange and the mount portion, and the fastening member is inserted through a central hole of the grommet. Thereby, the vibration transmitted from the vehicle body frame to the fastening member is attenuated by the grommet, so that the vibration proof property of the fuel tank is improved.

  In the present invention, the mounting flange has a mounting cylinder provided with a collar, the mounting cylinder is inserted into a mounting hole provided in the mounting flange, and the collar contacts the flange surface of the mounting flange. In this state, it is preferably joined to the mounting flange. By the contact, the mounting cylinder is easily and accurately positioned with respect to the mounting flange.

  In the present invention, the fuel tank preferably forms a fuel storage space between an upper plate and a bottom plate, and the mounting flange is preferably formed by superposition of the upper plate and the bottom plate. Accordingly, the mounting flange can be formed by the upper plate and the bottom plate, which are constituent members of the fuel tank, and the mounting flange can be easily provided as compared to mounting the separately provided mounting flange to the fuel tank.

  When the mounting flange is formed by superimposing the upper plate and the bottom plate, it is preferable that the mounting flange is bent to the inner side by bending the peripheral portion of the upper plate located on the outer side of the vehicle body to overlap the peripheral portion of the bottom plate. . Thereby, when the fuel tank is placed on the floor surface of the work place, the bent peripheral portion of the upper plate of the mounting flange hits the floor surface, so that the rigidity of the mounting flange is ensured and deformation and scratching can be prevented.

In the present invention, a pin is provided on one of the front part of the fuel tank and the vehicle body frame, and the front part of the fuel tank is provided by locking the pin in a pin locking hole provided on the other side. The structure connected with the said vehicle body frame is preferable. Thus, the front portion of the fuel tank can be easily attached to the vehicle body frame by simply inserting the pin. In addition, a gap for inserting a tool between the fuel tank and the head pipe, which is necessary for conventional bolting, is unnecessary, so the fuel tank is extended forward to the vicinity of the head pipe. The tank capacity can be increased, and the bolts are not exposed from the gap and the appearance is not impaired. Further, as described above, the rear portion of the fuel tank is supported by the vehicle body frame via the mounting flange provided at a front position of 1/4 to 1/2 of the front and rear length of the tank from the rear end of the tank. The load on the pin is reduced accordingly, and the pin can be made smaller.

  When the pin is locked to the pin locking hole and the front portion of the fuel tank is connected to the vehicle body frame, the pin locking hole is a front grommet made of an elastic body supported by the vehicle body frame or the fuel tank. The central hole can be formed. Thereby, the vibration transmitted from the vehicle body frame to the front portion of the fuel tank can be suppressed only by inserting the pin into the pin locking hole.

  When the pin is locked to the pin locking hole and the front portion of the fuel tank is connected to the vehicle body frame, the axis of the pin is inclined with respect to the tangent of the arc centering on the mounting hole of the mounting flange. It is preferable. As a result, an external force that lifts the front part of the fuel tank acts, and even if the fuel tank tries to rotate around the mounting hole, the rotation is blocked by the pin and the pin is prevented from coming out of the pin locking hole. Can be prevented.

  According to the present invention, the rear portion of the fuel tank is attached to the vehicle body frame by fixing the pair of left and right mounting flanges provided in front of the rear end of the fuel tank to the pair of left and right mounting portions of the vehicle body frame. Further, the cross member for supporting the rear portion of the fuel tank is not necessary, and the degree of freedom in design such as the arrangement of equipment in the peripheral portion of the fuel tank and the seat mounting height is improved. Further, the fuel tank can be attached to the vehicle body frame with a simple structure in which the fastening member is inserted through the mounting flange and the mount portion of the vehicle body frame. Further, since the fastening member is inserted from the outside into the mounting hole and the mount portion of the mounting flange, the assemblability is improved. In addition, since the mounting flange is provided at a position that is 1/4 to 1/2 of the longitudinal length of the tank from the rear end of the fuel tank, more than half of the load load on the fuel tank is applied to the mounting flange. The mounting structure of the front portion of the fuel tank can be simplified, for example, a structure in which only a pin is inserted.

1 is a left side view showing a motorcycle to which a fuel tank mounting structure according to an embodiment of the present invention is applied. It is the perspective view seen from the front slanting lower part of the fuel tank same as the above. It is a left view which shows the attachment state of a fuel tank same as the above. It is a longitudinal cross-sectional view which shows the attachment part of the rear part of a fuel tank same as the above. It is a perspective view which shows the front part of a vehicle body frame. It is a longitudinal cross-sectional view which shows the attachment part of the front part of a fuel tank same as the above. It is a perspective view which shows the attachment flange of a fuel tank same as the above.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a left side view showing a motorcycle which is a kind of saddle riding type vehicle to which a fuel tank mounting structure according to an embodiment of the present invention is applied. The body frame FR of the motorcycle includes a main frame 1 constituting the front half and a rear frame 2 connected to the rear part of the main frame 1 and constituting the rear half of the body frame FR. A head pipe 3 is attached to the front end of the main frame 1, and an upper bracket 4 and an under bracket 5 are attached to a steering shaft (not shown) that is rotatably inserted into the head pipe 3. A front fork 8 is supported on the under bracket 5, and a front wheel 9 is supported on a lower end portion of the front fork 8. A handle 10 is attached to the upper bracket 4 at the upper end of the front fork 8.

  A swing arm bracket 11 is provided at the rear end of the main frame 1, and a swing arm 12 is supported on the swing arm bracket 11 via a pivot shaft 13 inserted through the front end so as to be swingable up and down. ing. A rear wheel 14 is supported at the rear end of the swing arm 12. An engine E is supported at the center lower portion of the main frame 1, and the engine E drives the rear wheel 14 via a power transmission mechanism 16 such as a chain.

  A rider's seat 22 is supported on the rear frame 2, and a metal fuel tank 18 is attached between the handle 10 and the rider's seat 22 at the upper part of the main frame 1, that is, the upper part of the vehicle body. ing. The lower part of the rear part of the fuel tank 18 and the lower part of the rider's seat 22 are covered from the side by the side cover 17. In addition, a large cowling 30 called a full cowl that covers a portion from the front of the handle 10 to the side of the front of the vehicle body is attached to the front of the vehicle body. An indicator 34 is attached.

  FIG. 2 shows a fuel tank 18. In this figure, a pair of left and right mounting flanges 19A and 19B projecting from the lower ends of the left and right side surfaces are provided at the rear of the fuel tank 18. An attachment cylinder 25 provided with a flange portion 21 is attached to the attachment flanges 19A and 19B by welding, and details thereof will be described later. On the other hand, a mounting bracket 51 provided with a pair of pins 23 and 23 projecting diagonally forward and downward is fixed to the front surface of the fuel tank 18 on the bottom surface near the front end.

  FIG. 3 shows a mounting state of the fuel tank 18, in which a pair of left and right mounting flanges 19 </ b> A and 19 </ b> B of the fuel tank 18 is 1/2 with respect to the longitudinal length L of the fuel tank 18 from the rear end 18 a. It is provided at a forward position by 4L to 1 / 2L. On the other hand, the seat rail 20 which is a part of the rear frame 2 is provided with a pair of left and right mount parts 27 and 27 to which the mounting flanges 19A and 19B of the fuel tank 18 are attached. It will be described later.

  A mounting bracket 24 for projecting and mounting a pair of pins 23 is provided at the bottom of the front side of the fuel tank 18, and the main frame 1 is for vibration isolation. The front grommet 28 is supported. Details of the support structure of the front grommet 28 will be described later. The pin 23 is inclined so that the shaft center C protrudes forward with respect to a tangent line T of an arc R centering on a mounting hole 39 described later of the mounting flanges 19A and 19B.

  FIG. 4 shows a mounting portion at the rear of the fuel tank 18. Since the left and right mounting structures of the fuel tank 18 are the same, FIG. 4 shows the left mounting part as a representative. In the figure, the mount portion 27 is composed of a pair of mount pieces 29A and 29B each having one end fixed to the rear frame 2 of the vehicle body frame FR by welding. The mount pieces 29A and 29B may be a single object. Mount portions 27 including the pair of mount pieces 29A and 29B are provided on the left and right rear frames 2, respectively. A locking step portion 38 is formed on the outer mount piece 29A by bending a predetermined portion. Both mounting pieces 29A and 29B are provided with insertion holes 29a and 29b at opposite positions, respectively, and a welding nut 40 having a screw hole concentric with the insertion hole 29b is provided on the inner side surface of the inner mounting piece 29B. ing.

  On the other hand, in the fuel tank 18, the peripheral portions of the upper plate 31 positioned on the outer side of the vehicle body and the bottom plate 33 positioned on the inner side of the vehicle body are joined to each other, and between the upper plate 31 and the bottom plate 33. A container-like fuel storage space 37 is formed. The mounting flange 19A is integrally formed at the lower portion of the fuel tank 18 by superposing and welding flange pieces 31a, 33a extending downward from the upper plate 31 and the bottom plate 33, respectively. Similarly, side cover flanges 26A and 26B for supporting the front portion of the side cover 17 (FIG. 1) are integrally formed behind the mounting flanges 19A and 19B at the lower portion of the fuel tank 18 shown in FIG.

  The mounting cylinder 25 made of the pipe having the collar portion 21 is inserted into the mounting hole 39 formed in the mounting flange 19A of FIG. 4 so that the collar portion 21 is in contact with the outer flange surface of the mounting flange 19A. Thus, it is joined to the mounting flange 19A by welding. The collar portion 21 is formed by fitting a ring-shaped member into the outer periphery of the mounting cylinder 25 and fixing it by welding.

  The mounting flange 19A of the fuel tank 18 is supported by the mount 27 via a vibration-proof rear grommet 41 made of an elastic material such as rubber. The rear grommet 41 has flange portions 41a and 41b at both ends of the cylindrical shape. The rear grommet 41 is fitted inside the mounting tube 25, and the mounting flanges 19A and 19b are inserted between the flange portions 41a and 41b. The mounting cylinder 25 of 19B is positioned. A collar 42 is inserted into the center hole 41 c of the rear grommet 41. The collar 42 has an outer diameter larger than the hole diameters of the insertion holes 29a and 29b of the mount pieces 29a and 29B of the mount portion 27 and a length substantially equal to the distance between the pair of mount pieces 29A and 29B.

  With the collar 42 positioned concentrically with the insertion holes 29a and 29b of the mount portion 27, the fastening member 43 made of a bolt is inserted from the outer side into the insertion hole 29a of the mount piece 29A, the hollow portion of the collar 42, and the mount piece 29B. The pair of mounting flanges 19 </ b> A of the fuel tank 18 are fastened to the mount portion 27 of the rear frame 2 by being inserted into the insertion hole 29 b and screwed into the welding nut 40. When the fastening member 43 is screwed into the welding nut 40 and fastened, the collar 42 acts so as to keep the distance between the pair of mount pieces 29A and 29B constant, and the distance between the pair of mount pieces 29A and 29B is reduced. Excessive elastic deformation of the rear grommet 41 is prevented.

  FIG. 5 shows a mounting portion of the front portion of the fuel tank 18. In the figure, a head pipe 3 is welded to the front end portions of a pair of left and right frame pieces 1a, 1b constituting the main frame 1, and between the head pipe 3 and the frame pieces 1a, 1b, as in the conventional case. The reinforcing head pipe gusset 44 is joined. The head pipe gusset 44 is integrally formed with a mounting boss 48 of the front grommet 28 for vibration isolation (FIG. 3), and each mounting boss 48 is provided with a mounting hole 48a.

  As shown in FIG. 6, a vibration-proof front grommet 28 made of an elastic material such as rubber is fitted in the mounting hole 48a. In the front grommet 28, a small-diameter cylindrical portion 28c is formed between an outer thick first collar portion 28a and an inner thin second collar portion 28b. The thin second collar portion 28 b is elastically deformed to pass through the attachment hole 48 a, the cylindrical portion 28 c is fitted into the attachment hole 48 a, and the front grommet 28 is attached to the attachment boss 48. In this state, the first collar portion 28 a is positioned on the outer surface of the mounting boss 48.

  On the other hand, a reinforcing pad 50 is fixed to the outer surface of the bottom plate 33 of the fuel tank 18 facing the front grommet 28 by welding, and a mounting bracket 51 is fixed to the reinforcing pad 50 by welding. . In a state where the pin 23 is inserted into the mounting hole 51a of the mounting bracket 51, the pin head portion 23a is fixed to the mounting bracket 51 by welding. The pin 23 is engaged and locked in a pin locking hole 28 d formed by the center hole of the front grommet 28, so that the front portion of the fuel tank 18 is connected to the main body frame FR through the head pipe gusset 44. Connected to frame 1. In contrast to this embodiment, a pin 23 can be provided on the vehicle body frame FR side, and a front grommet 28 having a pin locking hole 28d can be provided on the fuel tank 18 side.

  FIG. 7 shows the mounting flange 19 </ b> A of the fuel tank 18. In the figure, the upper plate 31 positioned on the outer side of the upper plate 31 and the bottom plate 33 that are superposed to form the mounting flange 19A is bent inward at the peripheral edge of the lower half thereof, Polymerized at the periphery.

  In the above configuration, the rear portion of the fuel tank 18 shown in FIG. 3 fixes the pair of left and right mounting flanges 19A and 19B to the mount portions 27 provided on the left and right rear frames 2 of the body frame FR. Therefore, a cross member for supporting the rear portion of the fuel tank 18 is not necessary. As a result, the degree of freedom of design such as the arrangement of the devices in the vicinity of the fuel tank 18 and the mounting height of the seat 22 is improved. Further, the fuel tank 18 is attached to the vehicle body frame FR by inserting the fastening member 43 through the mounting flanges 19A and 19B and the mount portion 27 of the vehicle body frame FR, so that the attachment structure is simplified.

  Furthermore, since the fastening member 43 is inserted into the mounting flanges 19A and 19B and the mount portion 27 from the outer side where there are no obstacles in the periphery, the assemblability is improved. In addition, since the mounting flanges 19A and 19B are provided in front of the rear end 18a of the fuel tank 18 by 1/4 to 1/2 of the longitudinal length L of the tank 18, the load load on the fuel tank 18 is increased. Since more than half of this is applied to the mounting flanges 19A and 19B, the mounting structure of the front portion of the fuel tank 18 can be a simple structure with low strength, for example, a structure in which only the pin 23 is inserted.

  Further, a rear grommet 41 made of an elastic body is interposed between the mounting flanges 19 </ b> A and 19 </ b> B and the mount portion 27 shown in FIG. 4, and the fastening member 43 is inserted into the center hole 41 c of the rear grommet 41. Therefore, the vibration transmitted from the vehicle body frame FR to the fastening member 43 is attenuated by the rear grommet 41, so that the vibration isolating performance of the fuel tank 18 is improved.

  Further, the mounting flanges 19A and 19B have a mounting cylinder 25 provided with a flange portion 21. The mounting cylinder 25 is inserted into a mounting hole 39 provided in the mounting flanges 19A and 19B, and the collar portion 21 is attached to the mounting flange 19A. , 19B are joined to the mounting flanges 19A, 19B while being superposed on the flange surfaces of the mounting flanges 19A, 19B. After inserting into the mounting hole 39, the mounting tube 25 can be easily and accurately inserted into the mounting flange 19A, 19B simply by pushing the flange portion 21 into the mounting hole 39 until the collar 21 abuts against the flange surface of the mounting flange 19A, 19B. Can be positioned.

  In addition, since the mounting flanges 19A and 19B are formed by superposition of the upper plate 31 and the bottom plate 33 of the fuel tank 18, the shapes of the upper plate 31 and the bottom plate 33, which are existing components of the fuel tank 18, are partially set. The mounting flanges 19 </ b> A and 19 </ b> B can be integrally formed with the fuel tank 18 only by deformation. Therefore, the mounting flanges 19A and 19B can be easily provided as compared to mounting a separate mounting flange on the fuel tank.

  Further, as shown in FIG. 7, the mounting flanges 19 </ b> A and 19 </ b> B are formed by bending the peripheral portion of the upper plate 31 located on the outer side of the vehicle body inward and overlapping the peripheral portion of the bottom plate 33. When the fuel tank 18 is placed on the floor surface of the work place, the bent peripheral edge portion of the upper plate 31 of the mounting flanges 19A and 19B hits the floor surface, so that the mounting flanges 19A and 19B can be prevented from being scratched. .

  Further, a pin 23 is provided at the front portion of the fuel tank 18 shown in FIG. 6, and this pin 23 is locked in a pin locking hole 28d provided in the vehicle body frame FR, whereby the front portion of the fuel tank 18 is Since it is connected to the vehicle body frame FR, the front portion of the fuel tank 18 can be easily attached to the vehicle body frame FR by simply inserting the pin 23. Further, when the front portion of the fuel tank 18 is bolted, a gap for inserting a tool for tightening the bolt is required between the fuel tank and the head pipe. On the other hand, in the present embodiment using the pin 23, the gap is unnecessary, so that the fuel tank 18 can be extended forward to the vicinity of the head pipe 3 to increase the tank capacity. The bolts are not exposed from the gap and the appearance is not impaired.

  Further, as described above, the rear portion of the fuel tank 18 is attached to the vehicle body frame FR via the mounting flanges 19A and 19B provided in front of the tank rear end 18a by 1/4 to 1/2 of the tank length L. Since it is supported, the load on the pin 23 is reduced accordingly, and the pin 23 can be made smaller.

  Further, since the pin locking hole 28d is formed by the center hole of the front grommet 28 made of an elastic body supported by the vehicle body frame FR or the fuel tank 18, only the pin 23 is inserted into the pin locking hole 28d. The vibration transmitted from the vehicle body frame FR to the front portion of the fuel tank 18 can be suppressed.

  Further, as shown in FIG. 3, the axis C of the pin 23 is inclined with respect to the tangent line T of the arc R around the mounting holes 39 of the mounting flanges 19 </ b> A and 19 </ b> B. Even if an external force that lifts the front part acts and the fuel tank 18 tries to rotate along the path of the arc R around the mounting hole 39 of the mounting flanges 19A, 19B, the tangent T of the arc R The inclined pin 23 prevents the fuel tank from rotating. This prevents the pin 23 from coming out of the pin locking hole 28c.

  Further, as shown in FIG. 3, the mounting flanges 19A and 19B of the fuel tank 18 are arranged behind the center of gravity O of the fuel tank 18 when the fuel tank 18 is full, and more specifically in the vicinity of the center of gravity O. If the center of gravity O is provided at a position spaced rearward by a distance of 1/8 to 1/4 of the longitudinal length L of the fuel tank 18, the load on the pin 23 is further reduced, and the pin 23 is made smaller. Can do.

  In addition, although the said embodiment demonstrated the case where it applied to the motorcycle which is a kind of saddle riding type vehicle, this invention can be applied also to other saddle riding type vehicles, for example, rough terrain vehicle. it can. The present invention is not limited to the above-described embodiment, and various additions, modifications, or deletions are possible without departing from the spirit of the present invention, and such modifications are also included in the scope of the present invention.

1 Main frame (body frame)
2 Rear frame (body frame)
18 Fuel tank 18a Rear end 19A, 19B Mounting flange 21 Collar portion 23 Pin 27 Mounting portion 25 Mounting cylinder 28 Front grommet 28d Pin locking hole 31 Top plate 33 Bottom plate 37 Fuel storage space 39 Mounting hole 41 Rear grommet 43 Fastening member FR Body frame L Fuel tank longitudinal length R Arc T Tangent C Pin axis

Claims (2)

A mounting structure for attaching a fuel tank to the upper part of the body frame,
A pair of left and right mounts provided on the body frame;
A pair of left and right mounting flanges provided from the rear end of the fuel tank at a position of 1/4 to 1/2 of the longitudinal length of the tank,
The mounting flange is fastened by a fastening member inserted from the outside into the mounting flange and the mount part,
The fuel tank forms a fuel storage space between the top plate and the bottom plate, and the mounting flange is formed by superposition of the top plate and the bottom plate,
The mounting flange is overlapped on the periphery of the bottom plate by bending the periphery of the top plate located on the outside of the vehicle body inward,
The mounting flange has a mounting cylinder provided with a flange portion, the mounting cylinder is inserted into a mounting hole provided in the mounting flange, and the flange portion is in contact with the flange surface of the mounting flange, Joined to the mounting flange by welding,
A pin is provided on one of the front part of the fuel tank and the vehicle body frame, and this pin is engaged with a pin engagement hole provided on the other side, so that the front part of the fuel tank is attached to the vehicle body frame. Concatenated,
The pin locking hole is formed by a center hole of a front grommet made of an elastic body supported by the vehicle body frame or the fuel tank,
A fuel tank mounting structure in which the pin is inclined downward toward the front .   2. The fuel tank mounting structure according to claim 1, wherein a rear grommet made of an elastic body is interposed between the mounting flange and the mount portion, and the fastening member is inserted into a central hole of the grommet. Tank mounting structure.

Images