JPH07257459A - Fork protector structure for motorcycle - Google Patents

Abstract

PURPOSE:To increase rigidity of a fork protector, further to improve operability of a front fork while protecting a brake hose, and further to surely prevent the front fork from its damage and stain, in a fork protector structure for a motorcycle. CONSTITUTION:In a fork protector structure for an off-road motorcycle 22, a right vertical type front fork, mainly composed of a pair of right/left inner tubes 6 extended downward from the right/left of a steering head pipe 2 and a pair of right/left outer tubes 8 slidably fitted to the inner tubes 6, is protected. A fork protector 16, constituted by integrally forming a racing plate part 12 arranged in front sides of an upper/under bracket 10u, 10d and a protector part 14 extended downward along the inner tube 6, is provided, and the protector part 14 is provided with a shape of bending its lower end part 14d warped toward the front of a vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fork protector structure for a motorcycle.

[0002]

2. Description of the Related Art A front fork of a motorcycle is mainly composed of a pair of left and right outer tubes which pivotally support a front wheel shaft at a lower end thereof, and a pair of left and right inner tubes slidably fitted to the outer tubes. A so-called upright front fork is widely used. And conventionally,
In particular, there are some off-road motorcycles in which a fork protector for protecting the inner tube, the dust seal and the like from mud and flying stones is attached to the front fork. A conventional fork protector is fixed to, for example, a fork bracket or the like, and is mounted so as to mainly cover the front surface of the inner tube.

On the other hand, like the fork protector disclosed in Japanese Utility Model Publication No. 59-1892, the number plate on the front side of the fork bracket and the protector arranged along the inner tube are integrally formed in a flat plate shape. There is also one in which the lower part of the protector is slidably inserted into a guide hole provided at the upper end of the outer tube. The number plate-integrated fork protector is mounted by fastening the upper and lower ends of the vehicle number direction central portion of the number plate with screw members.

[0004]

However, since the conventional fork protector is formed in a flat plate shape along the inner tube to the lower end of the protector, the brake hose and the brake hose are fixed during the fork stroke. The lower end of the protector could easily get caught in the clamps and other components around the front wheel, which could damage the brake hose. In addition, there is a possibility that this catch deteriorates the slidability of the inner tube and reduces the operability of the front fork.

On the other hand, the fork protector disclosed in Japanese Utility Model Publication No. 59-1892 has a structure in which only the front surface of a flat number plate is fastened, so that the rigidity of the protector is particularly low and the front-rear direction is low. There is a problem that it is easy to flap, and that the inner tube is easily damaged or polluted by debris or mud from the side of the vehicle. Furthermore, the fork protector is flat so that the fork protector is easily subject to air resistance during traveling. . The present invention has been made in view of the problems of the conventional motorcycle fork protector structure, and an object thereof is to enhance rigidity of the fork protector,
Another object of the present invention is to provide a fork protector structure for a motorcycle that protects the brake hose and the like while improving the operability of the front fork, and reliably prevents damage and contamination of the front fork.

[0006]

The present invention has the following constitution in order to achieve the above object. That is, according to the invention of claim 1, a pair of left and right inner tubes extending downward from both sides of the steering head pipe toward both sides of the front wheel, and an upper end portion slidably fitted to the inner tube and a lower end portion. In the fork protector structure of the motorcycle, which mainly protects the front fork mainly from the pair of left and right outer tubes that pivotally support the front wheel shaft,
A front cover part disposed on the front side of a fork bracket connecting the upper parts of the pair of left and right inner tubes, and a protector part in which lower left and right parts of the front cover part are extended downward along the inner tube are integrally formed. The fork protector structure of the motorcycle is characterized in that the protector portion has a lower end portion that is bent toward the front of the vehicle.

According to a second aspect of the present invention, a pair of left and right inner tubes extending downward from the left and right sides of the steering head pipe toward both sides of the front wheel, and upper ends of the inner tubes slidably fitted to the inner tubes, Further, in a fork protector structure of a motorcycle for protecting a front fork mainly consisting of a pair of left and right outer tubes pivotally supporting a front wheel shaft at a lower end portion thereof, a protector covering at least a front surface of the inner tube along a longitudinal direction of the inner tube. A guide member that guides the inner surface of the fork protector when the inner tube slides is fixed to the outer tube, and a brake hose is piped between the protector section and the inner tube. In addition, inside the guide member or inside the guide member, the blur A fork protector structure for a motorcycle, wherein a space for through and grip the Kihosu is formed.

According to a third aspect of the present invention, a pair of left and right inner tubes extending downwardly from the left and right of the steering head pipe toward both sides of the front wheel, and the upper ends of the inner tubes are slidably fitted to the inner tubes. In the fork protector structure of the motorcycle, which protects the front fork mainly from the left and right outer tubes that pivotally support the front wheel shaft at the lower end, the front side of the fork bracket that connects the upper parts of the left and right inner tubes to each other. The fork protector is formed by integrally forming the disposed front cover part and the protector part in which the left and right lower parts of the front cover part are extended downward along the inner tube, and the protector part is provided for the inner tube. While exhibiting a shape that covers the front surface and the side surface, the front cover portion is provided with the protector portion. A fork protector for a motorcycle, wherein a side wall formed by extending a side portion of the fork bracket is provided on a side of the fork bracket, and an upper portion of the front cover portion and the side wall are fastened to the fork bracket. It is a structure.

[0009]

According to the invention of claim 1, since the lower end portion of the protector portion has a shape bent toward the front of the vehicle, the brake hose, the clamp for fixing the brake hose, and other parts around the front wheel are forked during a fork stroke. The lower end does not get caught on a component or the like.

According to the second aspect of the present invention, since the brake hose is held in the space inside or inside the guide member, even if the pressing force is applied to the protector portion when the vehicle falls, for example. Since the protector portion does not contact the brake hose, the brake hose is not damaged or deformed. Further, the guide member may be made of resin, for example, to improve the slidability of the protector portion. Therefore, the operability of the front fork is improved.

According to the third aspect of the present invention, the front cover portion is provided with a side wall formed on a side of the fork bracket by extending a side portion of the protector portion. Not only the front side but also the side wall is fastened to the fork bracket, so the rigidity of the fork protector is improved, and especially the rigidity of the protector part is increased, so the back and forth fluttering of the protector part is greatly reduced. it can. Moreover, since the rigidity is high, the entire configuration can be simplified. Further, since the protector portion has a shape that covers the front surface and the side surface of the inner tube, the inner tube can be reliably protected from flying stones and mud.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fork protector structure for a motorcycle according to the present invention will be described below with reference to the drawings. 1 is a side view of a front portion of a motorcycle showing a fork protector structure according to the present embodiment, FIG. 2 is a perspective view of the fork protector according to the present embodiment, and FIG. 3 is a front view of the fork protector according to the present embodiment. 4 is a plan view of the fork protector according to the present embodiment, FIG. 5 is a side view of the fork protector according to the present embodiment, FIG. 6 is a sectional view taken along line VI-VI of FIG.
FIG. 7 is a sectional view taken along line VII-VII of FIG. 8 is a front view showing a lower portion of the brake hose piping structure according to the present embodiment, FIG. 9 is a front view showing an upper portion of the brake hose piping structure according to the present embodiment, and FIG. FIG. 11B is a sectional view of the brake hose guide according to the example in a fixed state as seen on a plane, and FIG. 10B is a sectional view of the brake hose guide according to the present embodiment as seen on a plane as a plan view. Is a plan view of the bracket according to the present embodiment, and FIG. 11B is a side view of the bracket according to the present embodiment.

As shown in FIG. 1, the fork protector structure according to this embodiment is applied to an off-road bike 22 and extends downward from the left and right of the steering head pipe 2 toward both sides of the front wheel 4. The main front fork is protected by a pair of left and right inner tubes 6 and a pair of left and right outer tubes 8 having upper ends slidably fitted to the inner tubes 6 and having lower ends pivotally supporting the front wheel shaft 4a. To do.

This fork protector structure is shown in FIG.
As shown in FIG. 3 and FIG. 3, a number plate (an example of a front cover portion) disposed on the front side of the upper bracket (fork bracket) 10u and the under bracket (fork bracket) 10d that connect the upper portions of the pair of left and right inner tubes 6 to each other. 12 and this number plate part 1
A fork protector 16 is integrally formed with a protector portion 14 in which lower left and right portions of 2 are extended downward along the inner tube 6.

As shown in FIG. 1, the protector portion 14 extends from the upper end position of the front fender 24 to the upper end portion of the outer tube 8 and covers the front and side surfaces of the inner tube 6 as shown in FIG. Presents. That is, the protector portion 14 has a substantially V-shape in a lateral cross-sectional view, which is curved from the vehicle inner side of the outer tube 8 to the front of the outer tube 8 to the vehicle outer side of the outer tube 8. At the same time, it has an arc portion having a central angle of about 90 ° formed from the side of the outer tube 8 outside the vehicle to the rear of the outer tube 8. The lower part of the protector section 14 is
As shown in FIG. 3, it has a downwardly tapered shape when viewed from the front, and its lower end portion 14d has a shape that bends toward the front of the vehicle as shown in FIG.

As shown in FIG. 3, FIG. 4 or FIG. 5, the number plate portion 12 has a flat plate portion 12a having a substantially square shape when viewed from the front and a side portion of the protector portion 14 extending to extend the under bracket 10d. Side wall 1 formed on the side
2b and. Further, a brake hose insertion portion 26 through which the brake hose 20 passes protrudes rearward of the vehicle at an end of the rear surface (the surface facing the vehicle rearward) 12c of the vehicle number plate portion 12c on one side in the vehicle width direction. It is integrally formed with the portion 12.

Further, the flat plate portion 1 of the number plate portion 12
A concave portion 28 having a screw insertion hole 28a is formed in the central portion of the upper portion of 2a and the lower end portions of the flat plate portion 12a.
Screw insertion holes 30b are provided at both lower ends of the side wall 12b. Then, as shown in FIG. 5, the bolt 32 is inserted into each of the three screw insertion holes 28a of the flat plate portion 12a and screwed into the upper bracket 10u or the under bracket 10d, and as shown in FIG.
Is inserted into the screw insertion hole 30b of the side wall 12b and screwed into the under bracket 10d, so that the fork protector 16 is attached to the vehicle body.

Further, the upper end of the outer tube 8 is
As shown in FIGS. 7 and 8, a protector guide (guide member) 18 that guides the inner surface of the protector portion 14 when the inner tube 6 slides is fixed.

In a cross sectional view, the protector guide 18 has a front portion 18b having a substantially V-shape corresponding to the inner surface of the protector portion 14, and is a cylindrical clamp, which serves as a bolt 36 and a nut 38. Then, the rear portion is fastened to the outer tube 8. Further, the front portion 18b of the protector guide 18 is formed with a substantially cylindrical space portion 18a which is open to the inner side surface 18c and through which the brake hose 20 is inserted and gripped. Further, the protector guide 18 is made of, for example, a resin molded product having good slidability with respect to the protector portion 14, and can be easily removed from the outer tube 8 by loosening the bolt 36 and the nut 38 and then bending them. It is a thing.

Further, as shown in FIG. 8, the brake hose 2 is provided substantially at the center of the outer tube 8 in the longitudinal direction thereof.
A brake hose guide 40 for holding 0 is fixed.

This brake hose guide 40 is shown in FIG.
As shown in (a) and (b), an annular clamp portion 40a that is fastened to the outer tube 8 with a bolt 42.
And a grip portion 40b that is connected to the clamp portion 40a by a pin 40b1 and that grips the brake hose 20. In the clamp portion 40a, the bolt 42 has the screw insertion hole 40
It is fixed to the outer tube 8 by being inserted into a1 and screwed into the screw hole 40a2. Further, as shown in detail in FIG.
It is designed to be opened largely around 0b1 and is easily removed from the outer tube 8. on the other hand,
The grip portion 40b also has a shape for surely gripping the brake hose 20, and can be opened around the pin 40b1 to facilitate the attachment / detachment of the brake hose 20.

As shown in FIG. 8, the brake hose 20 extends upward from the brake caliper 44 located on the rear side of the outer tube 8 and passes through the inner side of the outer tube 8 to reach the front side of the outer tube 8 through the inside of the vehicle. It is gripped by the grip portion 40b of the hose guide 40.
Then, as shown in FIG. 9, the brake hose 20 is piped from the brake hose guide 40 in a vertically upward direction so as to pass between the protector portion 14 and the inner tube 6, and the space of the protector guide 18 is provided. It passes through the portion 18a and is gripped here. The brake hose 20 gripped in the space 18 a passes upward between the protector section 14 and the inner tube 6, reaches the upper end of the inner side surface of the number plate section 12, and reaches the brake hose insertion section 26. It is guided and connected to a master cylinder (not shown) fixed to the handle.

According to the fork protector structure of the present embodiment having the above-described structure, the side wall 12b is provided in the number plate portion 12, and not only the flat plate portion 12a of the number plate portion 12 but also the side wall 12b is provided. Since it is fastened to the under bracket 10d, the rigidity of the fork protector 16 is improved, and in particular, the rigidity of the protector portion 14 is much higher than the conventional one in combination with the substantially cylindrical shape. Become. As a result, flaps of the protector portion 14 in the front-rear direction are almost eliminated. Also, because of its high rigidity, the fork protector 1
The configuration of 6 can be simplified. In addition, the protector section 14
Has a shape that covers the front surface and the side surface of the inner tube 6, so that the inner tube 6 can be reliably protected from flying stones and mud. Furthermore, the protector section 14
Since the outer surface of the is a smooth curved surface having a substantially V shape in a cross-sectional view, it is possible to reduce the air resistance received by the fork protector 16 during traveling, and at the same time, the design flexibility of the fork protector 16 can be expanded.

The lower end portion 14d of the protector portion 14
Has a shape that bends toward the front of the vehicle, so that the lower end portion 14d does not get caught on the brake hose 20, the brake hose guide 40, and other components around the front wheel during a fork stroke. Further, since the lower portion of the protector portion 14 is tapered downward as viewed from the front, the front wheel brake disc 52 and the like interfere with the lower portion as shown in FIG. 3 even during a full stroke of the fork. You can choose not to. In addition, the flapping of the lower part is suppressed. The brake disc 52 shown in FIG. 3 shows a position relative to the protector portion 14 at the time of full stroke of the fork.

Further, since the brake hose 20 is gripped by the space 18a of the protector guide 18, even if a pressing force is applied to the protector 14 when the vehicle falls, for example, the protector 14 contacts the brake hose 20. Therefore, the brake hose 20 is not damaged or deformed. Further, since the protector guide 18 is made of a material having good slidability such as a resin molded product, the slidability of the protector portion 14 is improved. Therefore,
The operability of the front fork can be improved.

The fork protector structure according to this embodiment is a preferred embodiment of the present invention, and the technical scope of the present invention is not limited to this embodiment.

For example, when the side portion (side wall 12b) of the fork protector 16 is fastened to the under bracket 10d, as shown in FIGS. 11 (a) and 11 (b), the side portion of the fork protector 16 and the under bracket 10d. You may interpose the bracket 46 between 10d. In this case, the bolt 48 is passed through the screw insertion hole 46b of the bracket 46 and screwed into the under bracket 10d, and the screw 50 is passed through the side portion of the fork protector 16 so that the screw hole 46a of the bracket 46 and the under bracket are inserted. Screw to 10d. In this way, if the fork protector 16 and the bracket 46 are fastened together with the bracket 46 interposed, the fork protector 16
The rigidity of can be further improved.

[0028]

As described above, according to the present invention, the rigidity of the fork protector can be increased, and
It is possible to improve the operability of the front fork while protecting the brake hose, and it is possible to reliably prevent the front fork from being damaged or soiled.

[Brief description of drawings]

FIG. 1 is a side view of a front portion of a motorcycle showing a fork protector structure according to the present embodiment.

FIG. 2 is a perspective view of a fork protector according to the present embodiment.

FIG. 3 is a front view of a fork protector according to the present embodiment.

FIG. 4 is a plan view of a fork protector according to the present embodiment.

FIG. 5 is a side view of the fork protector according to the present embodiment.

6 is a sectional view taken along line VI-VI of FIG.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a front view showing the lower portion of the piping configuration of the brake hose according to the present embodiment.

FIG. 9 is a front view showing an upper portion of the piping structure of the brake hose according to the present embodiment.

FIG. 10A is a plan view showing a fixed state of a brake hose guide according to this embodiment, and FIG. 10B is a plan view showing an open state of a brake hose guide according to this embodiment.

11A is a plan view of the bracket according to the present embodiment, and FIG. 11B is a side view of the bracket according to the present embodiment.

[Explanation of symbols]

 2 Steering head pipe 4 Front wheel 4a Front wheel shaft 6 Inner tube 8 Outer tube 10u Upper bracket (fork bracket) 10d Under bracket (fork bracket) 12 Number plate part (an example of front cover part) 12b Side wall 14 Protector part 14d Lower end of protector part Part 16 Fork protector 18 Protector guide (guide member) 18a Space part 20 Brake hose 22 Off-road motorcycle (an example of a motorcycle)

Claims (3)

[Claims] 1. A pair of left and right inner tubes extending downward from left and right of a steering head pipe toward both sides of a front wheel, an upper end of which is slidably fitted to the inner tube, and a lower end of which is a front wheel shaft. In a fork protector structure for a motorcycle, which mainly protects a front fork from a pair of left and right outer tubes that axially support the front tube, a front cover portion disposed on the front side of a fork bracket connecting the upper portions of the pair of left and right inner tubes. And a fork protector integrally formed with a protector part that extends downwardly along the inner tube from left and right lower parts of the front cover part, and the lower end part of the protector part is bent toward the front of the vehicle. Motorcycle fork protector structure characterized by having a shape. 2. A pair of left and right inner tubes extending downward from both sides of the steering head pipe toward both sides of the front wheel, an upper end portion slidably fitted to the inner tube, and a lower end portion of the front wheel shaft. In a fork protector structure of a motorcycle, which mainly protects a front fork from a pair of left and right outer tubes that axially support, a protector portion that covers at least the front surface of the inner tube along the inner tube longitudinal direction is provided, and the outer tube A guide member that guides the inner surface of the fork protector when the inner tube slides is fixed between the protector portion and the inner tube.
A fork protector structure for a motorcycle, wherein a brake hose is piped and a space for passing and holding the brake hose is formed inside or inside the guide member. 3. A pair of left and right inner tubes extending downward from the left and right sides of the steering head pipe toward both sides of the front wheel, and an upper end portion slidably fitted to the inner tube, and a lower end portion of the front wheel shaft. In a fork protector structure for a motorcycle, which mainly protects a front fork from a pair of left and right outer tubes that axially support the front tube, a front cover portion disposed on the front side of a fork bracket connecting the upper portions of the pair of left and right inner tubes. And a fork protector formed by integrally forming a protector part that extends downwardly along the inner tube from left and right lower portions of the front cover part, and the protector part has a shape that covers the front surface and the side surface of the inner tube. At the same time, the side portion of the protector portion is extended to the front cover portion and Side walls formed on the side of the click bracket is provided, the top and the side wall of the front cover portion, a fork protector structure for a motorcycle characterized in that it is fastened to the fork bracket.