JP4322619B2 - Body frame structure for saddle-ride type vehicles - Google Patents

Description

  The present invention relates to a structure of a body frame in a saddle-ride type vehicle such as a motorcycle.

  As this kind of conventional thing, there exists a thing as described in patent document 1, for example. That is, an engine is mounted on the body frame, a fuel tank is placed on the upper side of the engine, a seat is placed on the rear side of the fuel tank, a front wheel is placed on the front side of the body frame, and a rear side is placed on the rear side. Each wheel is arranged.

  The vehicle body frame is provided with a cylindrical head pipe at the front end, and a steering shaft is rotatably supported on the head pipe. The steering shaft has a handle on the upper side and a pair of left and right front forks on the lower side. The front wheel is pivotally supported via

The head pipe has a front end portion of a pair of left and right main frames fixed thereto. These main frames extend rearward and obliquely downward, and a fuel tank is disposed on the upper side of the main frame. A sheet is disposed on the rear side. Further, an engine is disposed below the main frame.
JP-A-3-135589.

  However, in the prior art disclosed in Patent Document 1, since the main frame is formed in a linear shape, the position of the fuel tank disposed on the upper side of the main frame is increased, and this height is increased. In order to suppress this, the capacity of the fuel tank could not be increased so much. An engine is disposed below the main frame. However, since the main frame has a linear shape, there is a problem that a gap is formed between the engine and the engine.

  Therefore, the present invention can secure the capacity while suppressing the height of the fuel tank disposed on the upper side of the main frame, and also provides the engine and the main frame disposed on the lower side of the main frame. An object of the present invention is to provide a vehicle body frame structure for a saddle-ride type vehicle that can suppress the occurrence of a gap between the two.

In order to solve this problem, according to the first aspect of the present invention, a pair of left and right main frames are extended obliquely downward and rearward from a head pipe provided at a front portion of a vehicle body frame, and a fuel is disposed above the main frames. In the vehicle body frame structure for a saddle-ride type vehicle in which a tank is disposed, the main frame has a bent portion formed on the rear side of the fuel tank disposition range, so that as a whole, as viewed from the side of the vehicle body It is characterized by being formed in a generally U shape so as to protrude downward.

According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the main frame has a front portion side in front of the bent portion and a rear portion side in the rear side of the bent portion. , characterized in that the inclination of the front portion side is larger than the inclination of the rear side.

The invention according to claim 3 is provided with a seat frame fixed in the vicinity of the rear of the bent portion of the main frame and extended rearward and obliquely upward in addition to the configuration according to claim 1 or 2. the front end of the fuel tank is attached to the front portion side of the main frame, the rear end is attached to the seat frame, between the bent portion and the fuel tank and the seat frame, substantially triangular in side view of the vehicle body It is characterized by forming a space .

  According to a fourth aspect of the present invention, in addition to the configuration according to any one of the first to third aspects, the main frame has a cylindrical shape, the rear end portion is released, and the rear end portion is disposed in the rear end portion. While the reinforcing member for preventing the rear end portion from being crushed is disposed, the cylindrical end portion of the backstay is abutted and welded to the outer peripheral surface of the rear end portion.

According to a fifth aspect of the present invention, in addition to the configuration according to the fourth aspect, a communication hole for communicating the inside and the outside of the main frame is formed on the front side of the reinforcing member on the main frame. And

According to a sixth aspect of the invention, in addition to the configuration of the fourth or fifth aspect, a communication gap is provided between the reinforcing member and the inner wall of the main frame so as to communicate the inside and outside of the main frame. And

According to the first aspect of the present invention, the main frame protrudes downward as a whole in a side view of the vehicle body by forming a bent portion in the vicinity of the rear side of the fuel tank arrangement range. Therefore, since the space for disposing the components on the upper side of the main frame can be expanded, the fuel tank capacity can be increased while suppressing the height of the fuel tank.

  In addition, by increasing the inclination of the front portion of the main frame as described above, the inclination of the fuel tank or the like disposed thereon can also be increased, and this portion can have a vertically long appearance.

  Further, the inclination of the rear portion of the main frame can be made gentler, and the engine can be made closer to the cylinder head side of the engine disposed below the main frame, so that the gap between the main frame and the engine The appearance quality can be improved.

According to the invention described in claim 2, the main frame includes a front of the front side of the bent portion, and a rear side after the bent portion side, the inclination of the rear side of the front side Since it is larger than the inclination, the part arrangement space on the upper side of the main frame can be expanded, so that the capacity of the fuel tank can be increased while suppressing the height of the fuel tank.

According to the invention described in claim 3, it is fixed to the rear vicinity of the bent portion of the main frame, a seat frame which is extended toward the rear obliquely upward, the front end of the fuel tank before side of the main frame attached to the rear end is attached to the seat frame, between the bent portion and the fuel tank and the seat frame, for forming a space of substantially triangular in side view of the vehicle body, the fuel by utilizing the space of the substantially triangular Tank parts (fuel cock) can be arranged.

  According to the invention described in claim 4, the main frame has a cylindrical shape, the rear end portion is released, and the reinforcing member that prevents the rear end portion from being crushed is disposed in the rear end portion. Since the cylindrical end portion of the back stay is abutted against the outer peripheral surface of the rear end portion and welded, the appearance quality of the connecting portion between the main frame and the back stay can be improved. That is, the rear end portion side of the main frame is a conspicuous portion in the appearance of the substantially central portion of the side surface of the vehicle body. If the rear end portion is crushed, the appearance quality deteriorates, but the rear end portion is not crushed. Since the part is opened, appearance quality can be ensured. Further, if the front end side of the backstay is crushed and an attempt is made to weld it to the upper side of the rear end of the main frame, the weld length becomes long, and this also causes the appearance quality to deteriorate. On the other hand, in this invention, by welding the end portion of the cylindrical backstay against the rear end portion of the main frame, the welding length is short and the appearance quality can be improved. On the other hand, since the weld length is short, insufficient strength is likely to occur. However, by arranging the reinforcing member in the rear end portion of the main frame, the strength can be secured without impairing the appearance.

According to the fifth aspect of the present invention, the communication hole for communicating the inside and outside of the main frame is formed on the front side of the portion where the reinforcement member of the main frame is disposed, so that the reinforcement member is disposed in the main frame. Even when there is no gap between the reinforcing member and the inner wall of the main frame, water can be drained and air can be removed during painting and use of the vehicle through the communication hole. Moreover, plug welding of the reinforcing member can be performed through the communication hole.

  According to the sixth aspect of the present invention, the communication gap for communicating the inside and outside of the main frame is provided between the reinforcing member and the inner wall of the main frame. And venting.

  Embodiments of the present invention will be described below.

  1 to 6 show an embodiment of the present invention.

  First, the configuration will be described. FIG. 1 shows a motorcycle as a “saddle-ride type vehicle”, and this motorcycle can also travel on a rough and uneven surface mainly on so-called on / off vehicles. It is a two-wheeled vehicle, and is designed to be lighter and lighter than a motorcycle for traveling on a normal road in consideration of handling of the vehicle body during traveling.

  Specifically, reference numeral 51 in FIG. 1 denotes a vehicle body frame. An engine 52 is mounted on the vehicle body frame 51, a fuel tank 53 is mounted on the upper side of the engine 52, and a seat 54 is mounted on the rear side of the fuel tank 53. Furthermore, a front wheel 55 is disposed on the front side of the vehicle body frame 51, and a rear wheel 56 is disposed on the rear side.

  As shown in FIGS. 2 and 3, the vehicle body frame 51 is provided with a cylindrical head pipe 59 at the front end, and a steering shaft 60 is rotatably supported on the head pipe 59. The steering shaft 60 is The upper end is fixed to the crown handle 63 and the lower end is fixed to the under bracket 64. A handle 61 is attached to the crown handle 63, and a pair of left and right front forks 62 are inserted and attached to the crown handle 63 and the under bracket 64, respectively. The front wheel 55 is pivotally supported.

  Further, front end portions 65f of a pair of left and right main frames 65 are fixed to the head pipe 59, and these main frames 65 extend rearward and obliquely downward. A single down tube 66 is disposed by fixing the front end portion 66 a to the head pipe 59.

  A horizontal cross member 67 is installed between the pair of left and right main frames 65, and an upper and lower cross member 68 is installed between the horizontal cross member 67 and the down tube 66.

Its main frame 65, as shown in FIG. 2, exhibits a pipe-shaped, downwardly to the side near the rear of the provided range of the fuel tank 53, by the bent portion 65a is formed, when the body is viewed from the side, as a whole The end of the rear end portion 65b is open.

  As shown in FIG. 5, a disc-shaped reinforcing member 65c is fitted in the cylindrical rear end portion 65b. The front side of the reinforcing member 65c is located on the lower side and the upper side. A lower long hole 65d and an upper long hole 65e are formed as "communication holes". The reinforcing member 65c is plug welded through the long holes 65d and 65e.

  Specifically, as shown in FIG. 5, the male member 81a of the positioning jig 81 shown by a two-dot chain line in the drawing is screwed into the screw hole 65i of the reinforcing member 65c, and the reinforcing member 65c is connected to the main frame 65. It inserts to the predetermined position of the rear-end part 65b, and in this state, it welds via both long holes 65d and 65e with the welding torch 82 shown by a dashed-two dotted line in a figure. Of course, the backstay 71 is not welded to the main frame 65 at this time. After welding, the positioning jig 81 is removed from the reinforcing member 65c.

  The front end portions 70a of the pair of left and right seat frames 70 are fixed near the rear of the bent portion 65a of the main frame 65, and these seat frames 70 extend rearward and obliquely upward.

  Further, a pair of left and right back stays 71 are disposed below the seat frame 70. The back stay 71 has a front end portion 71 a that is abutted and welded to the upper side of the rear end portion 65 b of the main frame 65, and is fixed to the rear obliquely upward. Further, the rear end portion 71 b is connected to the seat frame 70. It is fixed to the lower side of the rear end portion 70b (see FIG. 2).

  Furthermore, a support frame 72 extends downward near the front end of the rear end portion 65b of the main frame 65, and the rear wheel 56 can swing up and down via the rear arm 73 to the support frame 72. It is supported by.

  Further, a plurality of cross members 74, 75, 76 are installed between the pair of left and right seat frames 70 and the like, as shown in FIG. A seat 54 is disposed on the upper side of the seat frame 70.

  The fuel tank 53 is disposed on the upper side of the pair of main frames 65 of the vehicle body frame 51 at a corresponding position between the main frames 65.

  Specifically, as shown in FIG. 4, the fuel tank 53 has a vertically divided structure, and has a lower panel 53a disposed on the lower side and an upper panel 53b disposed on the upper side. Flange portions 53c and 53d formed on the peripheral edge portions of the respective side portions of 53b are joined by welding.

A fuel cap 53g is detachably attached to the upper panel 53b on the front end side of the upper surface portion, and a fuel cock 53h is disposed on the rear end side of the bottom surface portion of the lower panel 53a. The fuel cock 53h is disposed in a substantially triangular space formed between the bent portion 65a , the fuel tank 53, and the seat frame 70 in a side view of the vehicle body .

  The front end portion 53e of the flange portions 53c and 53d is attached to the front end portion 65f side of the main frame 65, and the rear end portion 53f of the flange portions 53c and 53d is attached to the cross member 74 of the seat frame 70. It is installed.

  In this way, the fuel tank 53 is disposed obliquely along the main frame 65 on the arrangement range in front of the bent portion 56 a of the main frame 65.

  Further, a tank side cover 78 is provided on each side of the fuel tank 53, and the flange portions 53c and 53d are concealed by the tank side cover 78.

  Furthermore, the engine 52 is disposed below the main frame 65. The engine 52 has a cylinder block 52b extending obliquely upward from the crankcase 52a, and above the cylinder block 52b. A cylinder head 52c is provided. The cylinder head 52 c is approaching in the vicinity of the bent portion 65 a of the main frame 65.

In such a case, the main frame 65 protrudes downward as a whole in a side view of the vehicle body by forming a bent portion 65a in the vicinity of the rear side of the arrangement range of the fuel tank 53. Since the front portion of the main frame 65 can be inclined more than the bent portion 65a of the main frame 65, the space for disposing the components on the upper side of the main frame 65 can be increased. While suppressing the height, the capacity of the fuel tank 53 can be increased.

  In addition, by increasing the inclination of the arrangement range of the fuel tank 53 of the main frame 65 as described above, the inclination of the fuel tank 53 and the like arranged on the main tank 65 can be increased, and this portion can have a vertically long appearance. it can.

  Further, the inclination of the rear portion of the bent portion 65a of the main frame 65 can be made gentle, and the main frame 65 can be brought closer to the cylinder head 52c side of the engine 52 disposed below the main frame 65. The gap between the engine 65 and the engine 52 can be narrowed, and the appearance quality can be improved.

Furthermore, fixed to the rear vicinity of the bent portion 65a of the main frame 65, a seat frame 70 which is extended toward the rear obliquely upward, the front end of the fuel tank 53 is attached to the front side of the main frame 65, rear end attached to the seat frame 70, between the bent portion 65a and the fuel tank 53 and the seat frame 70, for forming a space of substantially triangular in side view of the vehicle body, by utilizing the space of the substantially triangular fuel Parts of the tank 53 (fuel cock 53h) can be disposed.

  Furthermore, the main frame 65 has a cylindrical shape, the rear end portion 65b is released, and the cylindrical front end portion 71a of the backstay 71 is abutted against and welded to the rear end portion 65b. Since the reinforcing member 65c is disposed in the rear end portion 65b, the appearance quality of the connecting portion between the main frame 65 and the backstay 71 can be improved. That is, the rear end portion 65b side of the main frame 65 is a conspicuous portion in the appearance of the substantially central portion of the side surface of the vehicle body, and crushing the rear end portion 65b side causes deterioration in the appearance quality. Since the rear end portion 65b is opened, the appearance quality can be ensured. Further, when the cylindrical front end 71a side of the backstay 71 is crushed and welded to the upper side of the rear end portion 65b of the main frame 65, the weld length becomes long. Incurs a decline. On the other hand, in this invention, welding length is short and appearance quality can be improved by abutting and welding the front end part 71a of the cylindrical backstay 71 to the main frame rear end part 65b. On the other hand, since the weld length is short, insufficient strength tends to occur. However, by arranging the reinforcing member 65c in the main frame rear end portion 65b, the strength can be ensured without impairing the appearance.

  In addition, since the long holes 65d and 65e are formed in front of the portion where the reinforcing member 65c of the main frame 65 is disposed, the reinforcing member 65c and the main member 65c are arranged in the main frame 65 by disposing the reinforcing member 65c. Even when there is no gap between the inner wall of the frame 65, water and air can be drained during painting and vehicle use through the long holes 65d and 65e. Moreover, plug welding of the reinforcing member 65c can be performed through the long holes 65d and 65e.

  The reinforcing member 65c is not limited to the shape of the first embodiment, and as shown in FIG. 7, a plurality of notches 65g are formed around the circular reinforcing member 65c so that the reinforcing member 65c is the main member. In a state of being disposed in the rear end portion 65b of the frame 65, a communication gap 65h that allows communication between the inside and the outside of the main frame 65 may be formed between the inner wall of the main frame rear end portion 65b. Even if it does in this way, drainage and air venting can be performed by the communication gap 65h.

1 is a side view of a motorcycle according to an embodiment of the present invention. It is a side view of the body frame concerning the embodiment. It is a top view of the vehicle body frame which concerns on the same embodiment. It is a side view which shows the fuel tank arrangement | positioning part which concerns on the same embodiment. It is sectional drawing which shows the connection part of the main frame which concerns on the embodiment, and a backstay. It is a top view which shows the rear-end part of the main frame which concerns on the embodiment. It is a figure which shows the modification of the reinforcement member which concerns on the embodiment.

Explanation of symbols

51 body frame
52 engine
53 Fuel tank
54 seats
55 Front wheels
56 Rear wheel
59 Headpipe
65 Mainframe
65a Bending part
65b rear end
65c Reinforcement member
65d Lower long hole (communication hole)
65e Upper slot (communication hole)
65h Communication gap
66 Downtube
70 seat frame
70a front end
70b rear end
71 Backstay
71a Front end
71b Rear end

Claims (6)

In a body frame structure for a saddle-ride type vehicle in which a pair of left and right main frames are extended obliquely downward and rearward from a head pipe provided at a front portion of the body frame, and a fuel tank is disposed on the upper side of both main frames
The main frame is formed in a substantially U-shape so as to protrude downward as a whole in a side view of the vehicle body by forming a bent portion on the rear side of the arrangement range of the fuel tank. A vehicle body frame structure for a saddle-ride type vehicle characterized by the above. The main frame includes a front side of the front than the bent portion, said bent portion and a rear portion of the rear side of, and the slope of the front portion side is larger than the slope of the rear side The vehicle body frame structure for a saddle-ride type vehicle according to claim 1, Fixed to said rear vicinity of the bent portion of the main frame, a seat frame which is extended toward the rear obliquely upward, the front end of the fuel tank is attached to the front portion side of the main frame, the rear end is the The saddle riding type according to claim 1 or 2, wherein a substantially triangular space is formed between the bent portion, the fuel tank, and the seat frame. Body frame structure for vehicles. The main frame has a cylindrical shape, a rear end portion is released, and a reinforcing member for preventing the rear end portion from being crushed is disposed in the rear end portion, while a back surface is provided on an outer peripheral surface of the rear end portion. The body frame structure for a saddle-ride type vehicle according to any one of claims 1 to 3, wherein a cylindrical end portion of the stay is abutted and welded. Wherein the front side than the disposed position of the reinforcing member, the vehicle body frame structure for a saddle type vehicle according to claim 4, characterized in that the formation of the communicating hole for communicating the inside and outside of the main frame of the main frame. 6. The vehicle body frame structure for a saddle-ride type vehicle according to claim 4 , wherein a communication gap is provided between the reinforcing member and the inner wall of the main frame so as to communicate the inside and outside of the main frame.

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