JP2008279909A - Steering stem fastening structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering stem fastening structure for a vehicle capable of increasing design freedom such as shape freedom and arrangement freedom of a part arranged around a top bridge and freedom of production. <P>SOLUTION: The steering stem 34 is mounted to the top bridge 32 by a cap nut 36, and the cap nut 36 is constituted by a cylinder part 36a, and a lid part 36c integrally provided on an end part of the cylinder part 36a. A female 36b thread-bonded to a male screw 34b formed on the end of the steering stem 34 is formed on an inner peripheral surface of the cylinder part 36a, and a nut part 36e is integrally provided on the lid part 36c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement in a steering stem fastening structure of a vehicle.

The front fork that supports the front wheels for motorcycles is attached to the head pipe provided at the front end of the body frame so that it can be steered via the steering stem. The upper end of the steering stem is fastened to the top bridge that connects the left and right sides of the front fork. There is something that was done.
As such a conventional steering stem fastening structure, a structure in which the upper end of the steering stem is fastened to a top bridge with a nut is known (for example, see Patent Document 1).
JP-A-8-99675

3 and 4 of Patent Document 1 will be described below.
The steering stem 10 is rotatably supported by the head pipe 11 via bearings (consisting of an outer race 16, a cylindrical roller 14, and an inner race 17).

  A stem nut 21 is screwed into the upper portion of the steering stem 10 so as to hit the inner race 17, and the upper bracket 12 is fitted so as to hit the stem nut 21, and further, the steering stem 10 protruding upward from the upper bracket 12. A washer 31 is fitted into the upper end portion, and an upper nut 30 is screwed in, and the steering stem 10 is fastened to the upper bracket 12.

  A pair of left and right handle holders 22, 22 are provided on the upper surface of the upper bracket 12, and a bar handle (not shown) is attached to the handle holders 22, 22 by attaching the handle holders 24 with two bolts 26.

  Since the insertion hole provided for passing the steering stem 10 through the upper bracket 12 is provided between the left and right handle holders 22, 22, after the bar handle is attached to the upper bracket 12, Even if the upper end portion is inserted into the insertion hole of the upper bracket 12, it is difficult to screw the upper nut 30 into the upper end portion of the steering stem 10 with a tool. That is, the bar handle is attached to the upper bracket 12 after the steering stem 10 is attached to the upper bracket 12 with the upper nut 30. Thus, the assembly procedure is limited.

Further, when the steering stem 10 is attached after the bar handle is attached to the upper bracket 12, the positions of the handle holders 22 and 22 are changed so that the upper nut 30 can be screwed into the steering stem 10 with a tool, It is necessary to change the shape.
As described above, the degree of freedom in design such as the degree of freedom of shape and the degree of freedom of arrangement of parts arranged around the upper bracket 12 is reduced, and the order of assembly, that is, the degree of freedom in production is also reduced.

  An object of the present invention is to provide a steering stem fastening structure for a vehicle that can increase the degree of freedom of design and the degree of freedom of production of parts arranged around the top bridge and the degree of freedom of production. .

  According to the first aspect of the present invention, there is provided a vehicle in which a steering stem is rotatably supported on a head pipe, a top bridge constituting a front fork is attached to an upper end of the steering stem, and a bar handle is attached to the top bridge. In the steering stem fastening structure, the steering stem is attached to the top bridge with a cap nut, and the cap nut is composed of a cylindrical portion and a lid portion integrally provided at the end of the cylindrical portion. A female screw that is screw-coupled to a male screw formed at an end portion of the steering stem is formed on the peripheral surface, and a nut portion is integrally provided on the lid portion.

  As an action, a female screw that is screw-coupled to the male screw of the steering stem is formed on the inner peripheral surface of the cylindrical portion. Therefore, the outer shape of the nut portion formed on the lid provided at the end of the cylindrical portion is It becomes possible to make it small regardless of the outer diameter.

  If the outer diameter of the nut part is reduced, the outer diameter of the tool attached to the nut part to turn the nut part will be reduced, and even if the bar handle attached to the top bridge and the cap nut are close, It can be tightened to the steering stem.

The invention according to claim 2 is characterized in that the diameter of the circumscribed circle of the nut portion is smaller than the outer diameter of the steering stem.
For example, when a normal hex nut is screwed to the steering stem, the diameter of the circumscribed circle of the hex nut is larger than the outer diameter of the steering stem. In the present invention, the diameter of the circumscribed circle of the nut portion of the cap nut can be made smaller than the outer diameter of the steering stem, and a socket with a smaller outer diameter can be attached to the nut portion and turned. The degree of freedom of arrangement of the cap nut around the bridge increases. In addition, the use of small sockets also increases the degree of freedom in arranging socket storage locations on the production line.

According to the third aspect of the present invention, a stem insertion hole for passing the steering stem is formed in the top bridge, and the cylindrical portion of the cap nut is inserted into the stem insertion hole when the cap nut is screwed to the end portion of the steering stem. A large-diameter portion is formed, and the outer diameter of the cap nut lid portion is larger than the outer diameter of the cylindrical portion.
As an action, the cylindrical portion of the cap nut is inserted into the annular recess, and the amount of protrusion of the cap nut from the top surface of the top bridge is reduced.

The invention according to claim 4 is characterized in that a part of the lid portion overlaps the bar handle when viewed from the axial direction of the steering stem.
As an effect, the top bridge can be reduced in size by allowing the bar handle to partially overlap the bar handle when viewed from the axial direction of the steering stem. Even if a part of the lid overlaps the bar handle, it is possible to reduce the outer diameter of the nut of the cap nut, so the outer diameter of the tightening tool attached to the nut will be smaller, and tightening of the cap nut will be hindered. It can be done.

  In the invention according to claim 1, a steering stem is rotatably supported on the head pipe, a top bridge constituting a front fork is attached to an upper end of the steering stem, and a bar handle is attached to the top bridge. In the steering stem fastening structure, the steering stem is attached to the top bridge with a cap nut, and the cap nut is composed of a cylindrical portion and a lid portion integrally provided at the end of the cylindrical portion. A female screw that is screwed to the male screw formed at the end portion of the steering stem is formed on the peripheral surface, and a nut portion is integrally provided on the lid portion. For example, an existing screw is formed on the male screw formed at the end portion of the steering stem. Compared to tightening the nut and attaching the steering stem to the top bridge, It is possible to reduce the outer shape of the nut portion of the cap nut, it can also carry out the fastening operation in a narrow space when tightening the cap nut.

  Therefore, it is possible to increase the degree of freedom of design of the parts arranged around the top bridge, such as the shape freedom and the degree of freedom of placement, and to attach other parts such as a handle to the top bridge before attaching the steering stem to the top bridge. Even if it is mounted, it is less affected by the fastening of the steering stem, and the degree of freedom in production can be increased.

  In the invention according to claim 2, since the diameter of the circumscribed circle of the nut portion is smaller than the outer diameter of the steering stem, the outer diameter of the socket attached to the nut portion can be reduced, and the cap nut around the top bridge The degree of freedom of arrangement can be increased. In addition, the degree of freedom of tool placement at the storage location for storing the socket in the production line can be increased.

In the invention according to claim 3, a stem insertion hole through which the steering stem is passed is formed in the top bridge, and the cylindrical portion of the cap nut is inserted into the stem insertion hole when the cap nut is screwed to the end portion of the steering stem. Since the large diameter part is formed and the outer diameter of the cap nut lid part is larger than the outer diameter of the cylindrical part, the fastening position between the steering stem and the cap nut can be lowered by the large diameter part. The amount of protrusion of the cap nut from can be suppressed. Therefore, it is possible to facilitate fastening even in a narrow space.

  In the invention according to claim 4, since a part of the lid portion overlaps the bar handle when viewed from the axial direction of the steering stem, the top bridge can be reduced in size, and the front portion of the vehicle body is slim. Can be. Further, by making the nut portion of the cap nut small, after the bar handle is assembled to the top bridge, the steering stem can be attached to the top bridge by turning the cap nut, and productivity can be improved.

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 provided with a steering stem fastening structure (first embodiment) according to the present invention. The vehicle 10 includes a body frame 11 composed of a plurality of press-molded members. A front fork 13 is attached to a head pipe 12 constituting a front end portion so as to be steerable, an engine 14 is disposed at a center portion of the body frame 11, and a pivot shaft 16 provided at a lower rear portion of the body frame 11 can swing up and down. This is a motorcycle to which a rear fork 17 is attached.

  The vehicle body frame 11 includes a head pipe 12, a single main frame 21 extending rearward from the head pipe 12, a center frame 22 extending downward from the center of the main frame 21, a rear portion of the main frame 21, and a center frame. 22 is a mono-backbone type comprising a sub-frame 23 that is passed and attached to each of the lower portions of 22 and a down frame 24 that extends obliquely downward and rearward from the head pipe 12.

  The front fork 13 includes a pair of left and right cushion units 31, 31 (only a reference numeral 31 on the front side is shown), a top bridge 32 and a bottom bridge 33 that connect the cushion units 31, 31, and the top bridge 32, The steering stem 34 is supported by the head pipe 12 so as to be rotatable. The upper end of the steering stem 34 is fastened to the top bridge 32 with a cap nut 36. Has been.

Front wheels 39 are rotatably attached to the lower ends of the left and right cushion units 31, 31 via axles 38.
A bar handle 41 is attached to the top of the top bridge 32.

The engine 14 is a drive source in which a transmission 43 is integrally attached to a rear portion, an engine support bracket 45 attached to a lower end portion of the down frame 24, and a crankcase 46 supported on a lower portion of the center frame 22, A cylinder portion 47 protruding upward from the front portion of the crankcase 46 is provided.
The cylinder portion 47 includes a cylinder head 51, an intake device 52 is connected to the rear portion of the cylinder head 51, and an exhaust device 53 is connected to the front portion of the cylinder head 51.

The intake device 52 includes a throttle body 56 connected to an intake manifold 55 provided in the cylinder head 51.
The exhaust device 53 includes an exhaust pipe 61 connected to the front portion of the cylinder head 51 and extending rearward, and a muffler 62 connected to the rear end of the exhaust pipe 61.

The rear fork 17 has a rear wheel 64 attached to the rear end of the rear fork 17 via an axle 63, and a rear cushion unit 65 is attached to the rear fork 17 and the rear part of the main frame 21.
The main frame 21 is provided with a fuel tank 67 at the front and a seat 68 adjacent to the fuel tank 67 at the rear.

The fuel tank 67 is a component provided with a fuel supply device 71 that supplies fuel to the engine 14 via the intake device 52.
The fuel supply device 71 includes a fuel pump 72 attached to the bottom surface of the fuel tank 67 and disposed in the fuel tank 67, a first fuel supply pipe 73 having one end connected to the lower rear portion of the fuel pump 72, A fuel filter 74 connected to the other end of the first fuel supply pipe 73, a second fuel supply pipe 76 connected at one end to the lower end of the fuel filter 74, and connected to the other end of the second fuel supply pipe 76 A fuel return valve 78 having one end connected to the upper end of the fuel filter 74 and the other end connected to the bottom surface of the fuel tank 67 in order to return the fuel from the fuel filter 74 to the fuel tank 67. The fuel injection valve 77 is connected to the throttle body 56.

  Here, 81 is a front fender, 82 is a side or bar, 83 is a rear body cover, 84 and 84 (only the reference numeral 84 is shown on the front side) is a pair of left and right grab rails attached to the rear part of the main frame 21, 85 is A tail lamp, 86 is a rear fender, 87 is a drive chain for transmitting power from the transmission 43 to the rear wheel 64, 88 is a chain cover, and 91 is a stand.

  FIG. 2 is a cross-sectional view (first embodiment) showing the front portion of the vehicle body according to the present invention. A steering stem 34 is rotatably supported on the head pipe 12 via stem bearings 101 and 102. The bottom bridge 33 is attached to the lower end portion of the steering stem 34, the top bridge 32 is attached to the upper end portion of the steering stem 34 so as to be sandwiched between the stem nut 103 and the cap nut 36, and the cushion unit 31 is attached to the top bridge 32 and the bottom bridge 33. Installed.

  Here, 105 is a fork bolt for attaching the cushion unit 31 to the top bridge 32, 106 is a washer, 107 is a bolt for fastening the cushion unit 31 to the bottom bridge 33, 111 is a key cylinder attached to the top bridge 32, and 112 is a key cylinder. The key shutters 113 and 113 (only the reference numeral 113 on the front side) covering the upper side of 111 are a pair of left and right handle support portions 114 (only the reference numeral 114 on the front side) provided integrally with the top bridge 32. This is a handle bracket for fixing the bar handle 41.

  The stem bearing 101 includes an outer race 121 press-fitted into the head pipe 12, an inner race 122 fitted into the steering stem 34, and a plurality of outer races 121 and inner races 122 provided between the outer race 121 and the inner race 122. The stem bearing 102 includes an inner race 125 press-fitted into the steering stem 34, an outer race 126 press-fitted into the head pipe 12, and each of the inner race 125 and the outer race 126. And a plurality of steel balls 127 provided between the two. In addition, 128 is a dust cover and 131 is a dust seal.

  The stem nut 103 is screwed to a male screw 34 a formed on the steering stem 34, holds the inner race 122 of the stem shaft 101, and supports the lower surface of the top bridge 32.

  The top bridge 32 is formed with a steering stem insertion hole 32a for inserting the upper end portion of the steering stem 34 and a large diameter hole 32b having an inner diameter larger than the steering stem insertion hole 32a. A cylindrical portion 36 a screwed to a male screw 34 b formed at the upper end is inserted into the large-diameter hole 32 b of the top bridge 32. Reference numeral 135 denotes a washer.

FIG. 3 is a cross-sectional view of a cap nut according to the present invention (first embodiment). The cap nut 36 is integrally formed with a cylindrical portion 36a having an internal thread 36b formed on the inner surface and an end portion of the cylindrical portion 36a. The lid portion 36c is integrally formed with a hexagonal columnar nut portion 36e on the tapered surface 36d, and the outer diameter D1 of the lid portion 36c is larger than the outer diameter D2 of the cylindrical portion 36a. .
The diameter D3 of the circumscribed circle circumscribing the hexagon of the nut portion 36e is smaller than the outer diameter DS (see FIG. 2) of the steering stem 34 (see FIG. 2).

  In this way, by making the circumscribed circle diameter D3 of the nut portion 36e smaller than the outer diameter DS of the steering stem 34, the outer diameter of the tool 140 (see FIG. 5B) such as a socket attached to the nut portion 36e is reduced. It is possible to reduce the size, and the degree of freedom of arrangement of the cap nut 36 around the top bridge 32 can be increased. In addition, the degree of freedom of tool placement at the storage location where the tool 140 is stored in the production line can be increased.

4 is a view taken in the direction of arrow 4 in FIG. 1 (first embodiment), and is a view seen from the axial direction of the steering stem 34. Note that the key cylinder 111 (see FIG. 2) and the key shutter 112 (see FIG. 2) are omitted.
When viewed from the axial direction of the steering stem 34, the lid portion 36 c provided on the cap nut 36 partially overlaps the bar handle 41, but the nut portion 36 e of the cap nut 36 is different from the bar handle 41. Since they overlap, the cap nut 36 can be turned and tightened by putting a cylindrical tool 140 on the nut portion 36e.

  Further, by making a part of the lid portion 36c overlap the bar handle 41, the protruding amount of the rear portion of the top bridge 32 can be reduced, the width of the front and rear of the top bridge 32 is reduced, and the top bridge 32 is It can be made small. Thereby, the weight of the top bridge 32 can be reduced and the front portion of the vehicle body can be slimmed.

  Here, 32d is a mounting seat provided at the front of the top bridge 32 for mounting the key shutter 112, 32e and 32e are mounting holes opened in the top bridge 32 for inserting bolts for mounting the key shutter 112, A key cylinder insertion hole 32 f is formed in the top bridge 32 to allow the key cylinder 111 to pass therethrough.

The procedure for tightening the cap nut 36 described above to the steering stem 34 will be described next.
FIGS. 5A and 5B are operation diagrams (first embodiment) showing the tightening procedure of the cap nut according to the present invention.
In (a), with the bar handle 41 attached to the top bridge 32, the cap nut 36 is moved to above the large diameter hole 32b of the top bridge 32 and the upper end of the steering stem 34, and the cap nut 36 is turned by hand. Screw into the upper end of the steering stem 34.

  In (b), when the cap nut 36 is tightened partway into the steering stem 34, the tool 140 is attached to the nut portion 36 e and the cap nut 36 is finally tightened with the tool 140. This completes the tightening of the cap nut 36.

  2 and 3, the steering stem 34 is attached to the top bridge 32 with a cap nut 36, and the cap nut 36 is provided integrally with the cylindrical portion 36a and the end of the cylindrical portion 36a. A female screw 36b that is screw-coupled to a male screw 34b formed at an end of the steering stem 34 is formed on the inner peripheral surface of the cylindrical portion 36a, and a nut portion 36e is integrated with the lid 36c. For example, the outer shape of the nut portion 36e of the cap nut 36 is more than the existing nut compared to the case where the existing nut is fastened to the top bridge and the steering stem is attached to the top bridge formed at the end portion of the steering stem. When the cap nut 36 is tightened, the fastening operation can be performed even in a narrow space.

  Accordingly, it is possible to increase the degree of freedom of design of the parts arranged around the top bridge 32, such as the degree of freedom of design, the degree of freedom of arrangement, etc. Further, before attaching the steering stem 34 to the top bridge 32, Even if parts are attached, it is difficult to be influenced by the fastening of the steering stem 34, and the degree of freedom in production can be increased.

  Further, a steering stem insertion hole 32a for passing the steering stem 34 through the top bridge 32 is formed, and when the cap nut 36 is screwed to the end of the steering stem 34 in the steering stem insertion hole 32a, the cylindrical portion 36a of the cap nut 36 is formed. Is formed, and the outer diameter D1 of the lid portion 36c of the cap nut 36 is made larger than the outer diameter D2 of the cylindrical portion 36a. Therefore, the steering stem 34 and the cap nut 36 are separated by the large diameter portion 32b. The fastening position can be lowered, and the protruding amount of the cap nut 36 from the upper surface of the top bridge 32 can be suppressed. Therefore, it is possible to facilitate fastening even in a narrow space.

  Further, as shown in FIG. 4, a part of the lid portion 36 c of the cap nut 36 overlaps the bar handle 41 when viewed from the axial direction of the steering stem 34, so that the top bridge 32 can be made compact. The front part of the vehicle body can be made slim. Further, by reducing the nut portion 36e of the cap nut 36, the steering handle 34 can be attached to the top bridge 32 by turning the cap nut 36 after the bar handle 41 is assembled to the top bridge 32, thereby improving productivity. Can be improved.

  FIG. 6 is a cross-sectional view of an essential part showing a steering stem fastening structure (second embodiment) according to the present invention. A bolt insertion hole 57a is formed in the top bridge 57, and the steering stem 58 is passed through the bolt insertion hole 57a. This shows that the male screw 58a formed at the distal end portion of the steering stem 58 is formed on the cap nut 59, so that the screw 59a is screw-engaged, and the steering stem 58 is fastened to the top bridge 57. Reference numeral 60 denotes a washer.

  The cap nut 59 includes a cup part 59b having an internal thread 59a formed on the inner surface and a hexagonal columnar nut part 59c integrally formed on the bottom of the cup part 59b, which makes the shape simpler and reduces the cost. Can be reduced.

FIG. 7 is a sectional view showing a cap nut (third embodiment) according to the present invention. The same components as those of the first embodiment shown in FIG.
The cap nut 69 includes a cylindrical portion 36a having an internal thread 36b formed on the inner surface and a lid portion 69c formed integrally with an end portion of the cylindrical portion 36a. The lid portion 69c has a hexagonal hole 69d at the center thereof. The cap nut 69 is screwed to the steering stem 34 (see FIG. 2) by inserting a tool into the hexagonal hole 69d.

  FIG. 8 is a plan view of the central portion of the vehicle according to the present invention. A fuel discharge port 72a is provided at the rear of the fuel pump 72 provided in the fuel tank 67, and a first fuel supply pipe is connected to the fuel discharge port 72a. 73 shows a state where 73 joint portions 73a are connected.

  For example, when a fuel discharge port is provided on the side of the fuel pump 72 (upper or lower in the figure) and the joint portion 73a is connected to the fuel discharge port, the joint portion 73a protrudes to the side of the main frame 21. Therefore, external force from the side of the vehicle body is likely to act on the joint portion 73a. However, in the present vehicle, the joint portion 73a acts from the side of the vehicle by arranging the joint portion 73a within the width of the main frame 21. Can be protected from external forces.

  FIG. 9 is an exploded perspective view showing the rear body cover of the vehicle according to the present invention. The rear body cover 83 connects a pair of left and right left covers 144 and right cover 145 to the rear portions of these left and right covers 144 and 145. The center cover 146 is arranged as described above.

  Front portions of the left cover 144 and the right cover 145 are attached to the center frame 21 (see FIG. 8) with screws 148, 149, 151, 152 and plate-like nuts 153, 153, respectively, and inside the left cover 144 and the right cover 145. Protrusions 144a (not shown) and 145a that project from the rear are fitted into insertion holes (not shown) provided in the center frame 21 via rubber grommets 154, respectively, and rear portions of the left cover 144 and the right cover 145 Are attached to the center cover 146 with screws 156 and clips 157, and engaged with the center cover 146 by claw portions 144b, 144b, 145b, 145b formed on the left cover 144 and the right cover 145, respectively.

  FIG. 10 is a side view of the left cover according to the present invention. The left cover 144 includes a screw insertion hole 144d for inserting a screw 151 (see FIG. 9) to be attached to the center frame 21 (see FIG. 8), a grab rail 84 ( Notch portions 144f and 144g that avoid interference with FIG. 1), screw insertion holes 144j into which screws 156 (see FIG. 9) are inserted, claw portions 144b and 144b, and between these claw portions 144b and 144b And an inward projecting portion 144m provided on the inner surface. The right cover 145 (see FIG. 9) has the same basic structure as the left cover 144, and a description thereof will be omitted.

FIG. 11 is a plan view of the rear body cover according to the present invention, and shows the rear body cover 83 on the left side of the vehicle body center line 160 that passes through the center of the vehicle width and extends in the vehicle body longitudinal direction.
The center cover 146 has stepped portions 146b formed on the side walls 146a and 146a (only one symbol 146a is shown), and the claw portions 144b and 144b and the inwardly projecting portion 144m are inserted from the side wall 146a to the stepped portion 146b. Slit portions 146c to 146e are formed. 146g in the drawing is a center side inward protruding portion provided on the center cover 146 so as to face the inward protruding portion 144m.

  12A to 12C are explanatory views of a clip for a rear body cover according to the present invention. In FIGS. 12A and 12B, the clip 157 is made of spring steel and the plate is bent in a U-shape. The U-shaped portion 157a is formed, and V-shaped bent portions 157a and 157a are formed so as to be bent inwardly at both ends of the U-shaped portion 157a.

  FIG. 9C is a cross-sectional view showing a coupling state of the left cover 144 (see FIG. 9) (or the right cover 145 (see FIG. 9)) and the center cover 146 (see FIG. 9). It shows that the clip 144 is connected to the portion 144m (or the inward protruding portion 145m of the right cover 145) and the center-side inward protruding portion 146g of the center cover 146.

  Specifically, the inward protruding portion 144m of the left cover 144 (or the inward protruding portion 145m of the right cover 145) and the center-side inward protruding portion 146g of the center cover 146 are combined, and these inward protruding portions 144m (or inner 157m) and the center side inward protrusion 146g, the V-shaped bent portions 157b and 157b of the clip 157 are connected to the inner protrusion 144m (or the inner protrusion 145m) and the center side inward. The locking slits 144r (or locking slits 145r) opened in the protrusions 146g are hung on 146w.

FIG. 13 is a view taken in the direction of arrow 13 in FIG. 9 and shows a coupled state of the right cover 145 and the center cover 146 of the rear body cover 83.
That is, the inward projecting portion 145j of the right cover 145 is attached to the front portion of the center cover 146 with a screw 156, and the claw portions 145b and 145b of the right cover 145 are inserted into the slit portions 146c to 146e of the center cover 146 to be centered. Engaged with the cover 146 side, the inward protruding portion 145m of the right cover 145 is combined with the center-side inward protruding portion 146g of the center cover 146, and is sandwiched and coupled together by the clip 157.

  FIG. 14 is a view taken in the direction of the arrow 14 in FIG. 13, and the claw portion 145b of the right cover 145 includes a groove portion 145n. The step portion 146b of the center cover 146 is engaged with the groove portion 145n, and the tip of the claw portion 145b. The nail body 145p provided on the side wall 146a is engaged with the side wall 146a.

  The center-side inward projecting portion 146g of the center cover 146 includes upright walls 146r and 146s extending from the inner surface 146q of the center cover 146, and a flat wall 146t that connects the upright walls 146r and 146s. The cover 145 is combined with the inward projecting portion 145 m and joined by a clip 157.

  In this way, by connecting the flat wall 146t and the inward projecting portion 145m with the clip 157, even when the claw portion 145b is deteriorated with age and the engagement with the center cover 146 side is loosened, the right cover 145 (and It is possible to suppress the occurrence of chatter noise between the left cover 144) and the center cover 146. Further, since screws are not used, the plate thickness of the right cover 145 (and the left cover 144) and the center cover 146 can be reduced.

  In the present embodiment, as shown in FIG. 8, the fuel discharge port 72 a is provided in the rear portion of the fuel pump 72 and within the width of the main frame 21. Further, a fuel discharge port 72 a may be provided within the width of the main frame 21.

  The steering stem fastening structure of the present invention is suitable for a two-wheeled vehicle.

1 is a side view of a vehicle including a steering stem fastening structure (first embodiment) according to the present invention. It is sectional drawing (1st Embodiment) which shows the vehicle body front part which concerns on this invention. It is sectional drawing (1st Embodiment) of the cap nut which concerns on this invention. FIG. 4 is a view taken in the direction of arrow 4 in FIG. 1 (first embodiment). It is an effect | action figure (1st Embodiment) which shows the fastening procedure of the cap nut which concerns on this invention. It is principal part sectional drawing which shows the steering stem fastening structure (2nd Embodiment) which concerns on this invention. It is sectional drawing which shows the cap nut (3rd Embodiment) which concerns on this invention. It is a top view of the center part of the vehicle concerning the present invention. It is a disassembled perspective view which shows the rear body cover of the vehicle which concerns on this invention. It is a side view of the left cover concerning the present invention. It is a top view of the rear body cover concerning the present invention. It is explanatory drawing of the clip for rear body covers which concerns on this invention. FIG. 13 is a view taken along arrow 13 in FIG. 9. It is a 14 arrow line view of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 12 ... Head pipe, 13 ... Front fork, 32 ... Top bridge, 32a ... Stem insertion hole (steering stem insertion hole), 32b ... Large diameter hole, 34 ... Steering stem, 34b ... Steering stem screw, 36 ... Cap nut, 36a ... Cylindrical portion, 36b ... Female screw of the cylindrical portion, 36c ... Cover portion, 36e ... Nut portion, 41 ... Bar handle, D1 ... Outer diameter of the lid portion, D2 ... Outer diameter of the cylindrical portion, D3 ... diameter of circumscribed circle of nut part, DS ... outer diameter of steering stem.

Claims (4)

In a steering stem fastening structure of a vehicle in which a steering stem is rotatably supported on a head pipe, a top bridge constituting a front fork is attached to an upper end of the steering stem, and a bar handle is attached to the top bridge.
The steering stem is attached to the top bridge with a cap nut,
The cap nut includes a cylindrical portion and a lid portion integrally provided at the end portion of the cylindrical portion. The cap nut is screwed on the inner peripheral surface of the cylindrical portion to a male screw formed at the end portion of the steering stem. A steering stem fastening structure for a vehicle, wherein a female screw to be coupled is formed, and a nut portion is integrally provided on the lid portion.   The steering stem fastening structure for a vehicle according to claim 1, wherein a diameter of a circumscribed circle of the nut portion is smaller than an outer diameter of the steering stem.   A large-diameter portion into which a cylindrical portion of the cap nut is inserted when a stem insertion hole through which the steering stem is passed is formed in the top bridge, and the cap nut is screwed to the end portion of the steering stem. The steering stem fastening structure for a vehicle according to claim 1 or 2, wherein an outer diameter of the cap nut lid portion is larger than an outer diameter of the cylindrical portion.   4. The steering stem fastening structure for a vehicle according to claim 1, wherein a part of the lid portion overlaps the bar handle when viewed from an axial direction of the steering stem. 5. .

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