JPS6234883A - Top bridge for front fork - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a top bridge of a front fork in a vehicle having a handlebar, such as a motorcycle.

[Conventional technology]

In conventional vehicles equipped with handlebars, such as motorcycles, the handlebar is attached to the upper end, and a pair of front forks, which support the front wheel between the upper ends, are rotatably supported by a head pipe at the front end of the body frame. , the installation of the front fork to the head pipe is done on both front forks A.
A top bridge and a bottom bridge that connect the two wheels respectively are fastened at the center of the top bridge to the upper end of the steering stem which is rotatably inserted into the head pipe with a stem nut, and the bottom bridge is connected to the lower end of the steering stem. The handlebars are attached to each other and are rotatably supported using the steering stem as a fulcrum, and the handlebars are mounted above the stem nuts that fasten the top bridge that connects the upper ends of both front forks, via a handlebar holder. It was commonly installed.

[Problem that the invention seeks to solve]

Therefore, in the case of the above-described conventional top bridge structure, a stem nut that fastens the top bridge to the steering stem is fastened to the upper surface of the top bridge that connects the upper ends of the front forks, and Since the handlebar is installed close to the stem nut, the front fork and handlebar installation work during assembly of motorcycles, etc. requires the pre-assembled front fork to be attached to the body frame on the main assembly line. After it is attached to the steering stem inserted into the head pipe at the end, the handlebar is attached to the handle holder of the top bridge at the upper end of the front fork on the main assembly line, reducing the time required on the main assembly line. In addition, when removing the front fork during maintenance work, first remove the handlebar from the handle holder provided on the top bridge, then remove the stem nut and attach the front fork to the vehicle body frame. Since there are many various meters and switches attached to the handlebar, it is troublesome to dispose of the handlebar after it has been removed. If the handlebar is covered with a cover and meters are attached to the handlebar cover, the handlebar cover must be removed first, then the handlebar must be removed, the stem nut must be loosened and removed, and the front fork must be removed, making the work even more troublesome. There was a problem that.

The present invention has been developed in view of the above points, and allows the front fork to be attached and detached from the vehicle body frame while the handlebar remains attached to the top bridge, and also allows for easy attachment and detachment of the front fork in a short time. The purpose is to provide the top bridge of the front fork.

[Means for solving problems]

As a means for solving the above-mentioned problems, the present invention provides an upper end of a pair of front oaks that is attached to a steering stem that is rotatably supported by being inserted into a head pipe of a heavy-duty room, and that supports the width of the steering wheel. At the top bridge of the front fork, the handlebar is mounted horizontally, and the handlebar is mounted on a lower mounting surface that is attached to the steering stem, and that is continuous with this lower mounting surface and that is above the vehicle body of the lower mounting surface. It is characterized by having an upper mounting surface on which a handlebar is mounted which is spaced apart from the side.

[For production]

With the above configuration, the front fork is rotatably supported by attaching the lower mounting surface of the top bridge to the steering stem of the head pipe, and the handlebar is mounted on the upper side of the vehicle body on the lower mounting surface. The front fork can be attached to and removed from the vehicle body frame while the handlebar remains attached to the upper mounting surface of the top bridge of the front fork.

〔Example〕

Hereinafter, the present invention will be explained based on the drawings.

1 to 3 show an embodiment in which the present invention is applied to the top bridge of the front fork of a scooter. A head pipe 2 is provided to connect the front ends of the tubes 1b, and the head pipe 2 is provided with a front wheel (not shown) connected to a lower I.
A pair of front forks 3, 3 supported between the top bridge 4 and the bottom bridge 5 are provided to connect the upper parts of both front wheels 4.3, respectively.
Bearings (not shown) are mounted on the head pipe 2 at the upper and lower parts thereof, and the head pipe 2 is prevented from being removed by a thread nut (not shown), so that it can rotate freely.
It is attached to the mounted steering stem 6 and supported so as to be steerable.

The top bridge 4, which is attached to connect the upper ends of the pair of front wheels 3.3, is screwed into the upper end extension of the steering stem 6 extending from the upper end of the head vibe 2. and a lower mounting surface 4a that serves as a fastening surface for the stem nut 7 that fastens the top bridge 4;
An upper mounting surface 4b is provided on the upper side of the vehicle body of the lower mounting surface 4a, and both sides of the upper mounting surface 4a and both sides of the lower mounting surface 4b are connected by side walls 4C, 4C to form a box shape. At the same time, front fork mounting walls 4d, 4d are formed by extending the both side walls 4G, 4G from both sides of the lower mounting surface 4a of the top bridge 4 to the lower side of the vehicle body, respectively. Tori 1
The upper ends of each of the front forks 3 are fastened to the inside of the walls 4d, 4d with bolts 8, and both front forks 3.3 are connected at their upper portions by the top bridge 4 and the bottom bridge 5, and support the front wheel. The lower part thereof is connected by a stabilizer (not shown) to form an integral structure.

Furthermore, the top bridge 4. The pair of front forks 3 . The stem nut 7 is inserted into the mounting hole 4e formed on the surface 4a at a substantially medium angle, and the stem nut 7 is screwed into the male thread formed on the outer periphery of the upper end of the steering stem 6.
The bearing mounted on the upper part of the steering stem 6 and the stem nut 7 are fastened together so as to be clamped on the lower mounting surface 4a, and the front fork 3.3 is rotatable about the steering stem 7 as a fulcrum. Supported.

On the other hand, on the upper surface of the upper mounting surface 4b of the top bridge 4, there are two handle holders 10 to which the handle pars 9 are attached.
．． 10 are arranged in parallel, and each of the handle holders 10 has a semicircular lower support fixed to the upper surface of the upper mounting surface 4b and a body 10a, and each of the lower portions is connected to the body 10a by a bolt 10b. Semicircular upper presser body 10G to be fastened
The lower supports clamp and fix the center portion of the handle par 9 between the bodies 10a, 10a and the upper pressers 10C, 10C.

Furthermore, the handlebar 9 fixed on the lower mounting surface 4b of the top bridge 4 via the handle holder 10.10 has a front side and a rearward side of the vehicle body, except for the grip portions at both ends of the handlebar 9. The handle cover 11 is surrounded by a handle cover 11 that is formed in two parts. The second half body 11b is bolted and attached to the cover attachment part 9a formed on the handlebar 9, and the second half body 11b
The handlebar 9 can be fixed by engaging a plurality of latching claws 11d formed at predetermined positions n of the front half body 11a corresponding to the respective latching holes 11G in the latching holes 11c formed in the plurality of latching holes 11c formed in the handlebar 9. It surrounds and is assembled integrally with a tapping screw (not shown) inserted from the rear half body 11b side and fastened to the front half body 11a side.

Further, in the center of the handle cover 11, a work hole 12 for the n52i work of the handle par 9 is opened, spanning the front half body 11a and the rear half body 11b of the handle cover 11. Top bridge 4 from 12
By removing the bolts 10b of the handle holder 10° 10, the handle par 9 can be removed from the top bridge 4 with the handle cover 11 attached and surrounded. 12
is provided with a lid 13 that closes the working hole 12, and the lid 13 is attached to span the front half 11a and the rear half 11b of the handle cover 11.

In this embodiment, as described above, by using the top bridge 4 having the lower mounting surface 4a and the upper mounting surface 4b, the upper ends of the front forks 3.3 are connected, and
The steering stem 6 rotatably inserted into the head pipe 2 is fastened to the steering stem 6 via the lower mounting surface 4a, and the handlebar 9 is spaced apart from the lower mounting surface 4a above the vehicle body. Since the handlebar holder 10.10 is attached to the provided upper mounting surface 4b, the workability of attaching and detaching the front forks 3, 3 to and from the head pipe 2 of the vehicle body frame 1 is improved, and the handlebar holder 9. It is now possible to install and remove the front fork 3.3 and handlebar 9 with the front fork installed, and during assembly work, it is now possible to assemble the front fork 3.3 and handlebar 9 together on a sub-assembly line, etc. By performing the installation of the handlebar 9 on a sub-assembly line, which used to be done by aligning the position using the punch marks on the fork 3.3, the handlebar 9 can be installed accurately and the work time on the main assembly line can be shortened. It has the effect of

Furthermore, the front fork 3.3 and the handlebar 9 can be removed together during maintenance work, etc., and both the handlebar 9 and the front fork 3.3 can be removed when the front fork 3.3 is removed. Since work can be done with the various wires, cables, etc. that are placed over the wires, maintenance work etc. is facilitated.

Furthermore, a space that did not exist in the past is formed between the lower mounting surface 4a of the top bridge 4 fastened to the steering stem 6 and the upper mounting surface 4b to which the handlebar 9 is mounted, so this space can be utilized. It is possible to arrange the ignition switch, headlight bulb socket, etc. in this space, and by using the space, there is a degree of freedom in wiring etc., and it must be arranged so as not to interfere with steering wheel operation. This has the effect of making cable piping easier.

FIG. 4 shows another embodiment of the top bridge of the front fork according to the present invention. The front fork mounting wall of the top bridge is located inside each front fork, and the same reference numerals are given to the same components as in the above embodiment. .

A top bridge 20 provided to connect the upper end of the fork 3.3 to the pair of front wheels 1 is a stem nut that is screwed onto the upper end extension of the steering stem 6 of the head vibe 2 and fastens the top bridge 20. The handle holder 10 is provided on the upper surface of the lower mounting surface 20a, which is the fastening surface of the lower mounting surface 20a, and the lower mounting surface 20a is spaced apart from the upper side of the vehicle body.
．． It is formed into a box shape by an upper mounting surface 20b on which the top bridge 20 is fixedly mounted, and side walls 200.20G connecting the upper mounting surface 20a and the lower mounting surface 20b on both sides. Front fork mounting wall 20d from the bottom of the mounting surface 20a toward the bottom of the vehicle body.
, 20d are formed, and each of the pair of front forks 3, 3 has its upper end connected to the both front fork mounting walls 20d.

20d is fastened to the outside of the steering stem 6 with a bolt 8, which is connected to the top bridge 20 and a bottom bridge (not shown) to form an integral structure. The mounting surface 20a is fastened with the stem nut 7, and the steering stem 7
It is rotatably supported using the fulcrum as a fulcrum.

Further, each of the handle holders 10 has a lower support fixed to the upper mounting surface 20b of the top bridge 20.
a, and an upper presser body 10c which is removably fastened to the body 10a with a bolt 10b, and the handle par 9 has a center portion between the lower receiver and the body 10a and the upper presser body 10C. It is clamped and has a mounting number on it.
The same effects as those of the embodiment described above can be obtained.

〔Effect of the invention〕

As explained above, the present invention has a top bridge of the front fork that is suspended horizontally between the upper ends of a pair of front forks that support the front wheels, and a handlebar is attached to the top bridge of the front fork, and a lower mounting surface that is attached to the steering stem, and a lower mounting surface that is attached to the top bridge of the front fork that is attached to the steering stem. Since there is an upper mounting surface for attaching the handle bar that is continuous with the lower mounting surface and is spaced above the vehicle body, the front fork can be attached and detached from the vehicle body frame while the handlebar is still attached to the front fork. Made of
This has the effect of improving the workability of installing and removing the front fork.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, and Figure 1 shows how the top bridge according to the present invention is attached to the front fork and head pipe, and how the top bridge is attached to the front fork and head pipe. Fig. 2 is a front view of the top bridge, Fig. 3 is a sectional view taken along the line ■-■ of Fig. 2, and Fig. 4 shows another embodiment of the present invention. It is an exploded perspective view. 1... Vehicle body frame 2... Head pipe 3.
...Front fork 4...Top bridge 4
a...Lower mounting surface 4b...Upper mounting surface 4c
...Side wall 4d...Freon 1-Fork removal jJ
Wall 4e...Mounting hole 5...Bottom bridge 6
... Steering stem 7 ... Stem nut
9...Handlebar 10...Handle holder 11...Handle cover 20...Top bridge 20a...Lower mounting surface 20b...Upper claw (=J surface 20C...Side wall 20d... front fork mounting wall

Claims (1)

[Claims] 1. It is attached to a steering stem that is rotatably supported by inserting it into the head pipe of the vehicle body frame, is suspended horizontally between the upper ends of a pair of front forks that support the front wheels, and is equipped with a handlebar attachment part. At the top bridge of the front fork, a lower mounting surface that is attached to the steering stem, and a lower mounting surface that is continuous with the lower mounting surface,
A top bridge of a front fork, further comprising an upper mounting surface to which a handlebar is attached, which is provided apart from the lower mounting surface above the vehicle body.