JPH0867280A - Fork protector structure for motorcycle - Google Patents

Abstract

PURPOSE: To improve slidability of a fork protector also to protect a brake hose and further to facilitate performing piping work or the like of the brake hose, in a fork protector structure for a motorcycle. CONSTITUTION: In a fork protector structure for a motorcycle protecting an erected type front fork 10, the motorcycle has a fork protector 14 tightened to an underbracket 12a also to mainly cover a front surface of an inner tube 6, to fix a protector guide 16, guiding an inner side surface of the fork protector 14, to an upper end part of an outer tube 8. A hose clamp part 16e clamping a brake hose 18 is integrally formed with the protector guide 16, and further a hose guide part 14b guiding the brake hose 18 is integrally formed with a tightening part 14a of the fork protector 14.

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,
Particularly, 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, is attached so as to mainly cover the front surface of the inner tube, and is adapted to stroke together with the inner tube.

Further, the motorcycle is equipped with a brake device for braking the front wheels, and this brake device has a brake caliper fixed to the lower end of the outer tube and one end connected to the brake caliper. And a brake hose whose other end is connected to a master cylinder provided on the handlebar. The brake hose is piped along the longitudinal direction of the front fork.

[0004]

When piping a brake hose in a motorcycle equipped with the fork protector, the fork protector and the brake hose interfere with each other depending on their arrangement and piping configuration. there is a possibility. Therefore, a guide member that guides the fork protector to slide in a predetermined state is provided on the outer tube, and the brake hose is clamped so as not to interfere with the fork protector due to twist or slack in the brake hose. For example, it is necessary to secure the brake hose and to improve the slidability of the fork protector by fixing it to the front fork for piping.

Therefore, in order to prevent the fork protector and the brake hose from interfering with each other,
Since many parts such as the guide member, the clamp, and bolts for fixing these are required, the cost becomes high, or the structure around the front fork becomes complicated, and a great deal of labor is required for assembly work and piping work. There is a problem of cost.

The present invention has been made in view of the problems of the conventional fork protector structure for motorcycles, and its object is to improve the sliding property of the fork protector and to protect the brake hose at the same time. The purpose of the present invention is to provide a fork protector structure for a motorcycle that allows easy fork protector assembly work and brake hose piping work.

[0007]

The present invention has the following configuration to achieve the above object. That is, according to the present invention, 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 A fork protector structure for a motorcycle that mainly protects a front fork from a pair of left and right outer tubes that pivotally support a wheel axle, and an upper end portion is fastened to a front portion of a fork bracket that connects the pair of left and right inner tubes. And a fork protector that extends downwardly from the fastening portion along the inner tube and covers at least the lower front surface of the inner tube, wherein the inner tube slides on the upper end portion of the outer tube. Sometimes the protector guide that guides the inner surface of the fork protector is fixed. At the same time, the protector guide is integrally formed with a hose clamp portion for gripping the outer peripheral surface of the brake hose arranged along the front surface of the front fork, and the tightening portion of the fork protector is The fork protector structure for a motorcycle is characterized in that a hose guide portion for inserting and guiding the brake hose when the inner tube slides is integrally formed.

[0008]

According to the present invention, the hose clamp portion grips the outer peripheral surface of the brake hose, and when the fork is operated, the hose guide portion that moves up and down together with the inner tube guides the brake hose by inserting it. Is reliably protected from sliding fork protectors without damaging its piping condition. Further, the fork protector slides up and down smoothly without interfering with the brake hose while the inner wall of the fork protector is guided by the protector guide.

Further, since the hose clamp portion for gripping the brake hose and the hose guide portion for guiding the brake hose are formed integrally with the fastening portion of the fork protector and the protector guide, respectively. The number of parts is reduced and the structure is simplified. Therefore, the work of assembling the fork protector and the brake hose and the work of piping are facilitated.

[0010]

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. 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 an enlarged view taken along arrow A in FIG. 1, and FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

In this embodiment, as shown in FIG. 1, a pair of left and right inner tubes 6 extending downward from the left and right of the steering head pipe 2 toward both sides of the front wheel 4, and an upper end portion sliding on the inner tube 6. A fork protector structure for a motorcycle that protects an upright front fork 10 mainly composed of a pair of left and right outer tubes 8 that freely fit and supports the front wheel shaft 4a at its lower end, The upper end portion is fastened to the front portion of an under bracket (corresponding to a fork bracket) 12a that connects the inner tube 6 of the inner tube 6 and extends downward along the inner tube 6 from the fastening portion 14a. Fork protector 14 covering the front and outer surfaces
Is to have.

Further, at the upper end of the outer tube 8,
Fork protector 1 when sliding inner tube 6
The protector guide 16 that guides the inner surface of the No. 4 is fixed, and the protector guide 16 is integrally provided with a hose clamp portion 16e that grips the outer peripheral surface of the brake hose 18 that is piped along the front surface of the front fork 10. A hose guide portion 14b that is formed and that guides the brake hose 18 by inserting it into the fastening portion 14a of the fork protector 14 when the inner tube 6 slides.
Are integrally formed.

The structure of each section will be described in detail below. As shown in FIG. 1, the pair of left and right inner tubes 6 are fixed to the left and right mounting portions 12a1 (only the mounting portion 12a1 of the under bracket 12a is shown) of the upper and lower upper brackets 12b and the under bracket 12a, respectively. .

A steering shaft (not shown) loosely fitted in the steering head pipe 2 is pivotally supported by the upper bracket 12b and the under bracket 12a. A handlebar 20 is supported by a holder 12b1 at two places on the left and right of the upper bracket 12b, and a master cylinder 22 to which the upper end of a brake hose 18 is connected is fixed to the handlebar 20. In addition, a hose guide 24 having a substantially inverted L shape in side view, through which the brake hose 18 is inserted, is attached to a left front end portion of the upper bracket 12b.

A front wheel shaft mounting portion 8a protruding forward is provided at a lower portion of each of the left and right outer tubes 8.
Is integrally formed by casting, and on the lower side of the left outer tube 8 and on the opposite side (rear side) from the front wheel shaft mounting portion 8a, a brake caliper 28 for braking the brake disc 26 rotating with the front wheel 4 is provided. It is fixed by two upper and lower bolts 28a.

As shown in FIG. 2, the fork protector 14 is made of resin and is screwed to the front end of the mounting portion 12a1 of the under bracket 12a via a resin protector plate 30 with a pair of left and right bolts 32. . The hose guide portion 14b formed in the fastening portion 14a is a through hole formed along the vertical direction on the mating surface of the protector plate 30 and the fork protector 14, and is larger than the outer diameter of the brake hose 18. Has an inner diameter.

As shown in FIG. 3, the protector guide 16 has a substantially clamp shape and is made of a resin that can be deformed so that the rear side opens and closes. The protector guide 16 is located behind the upper end of the outer tube 8. Are fastened to the outer peripheral surface of the outer tube 8 by means of bolts 16b, washers 16c and nuts 16d. Further, on the front portion of the protector guide 16, there is formed a sliding contact portion 16a which is integrally formed and has a substantially rectangular shape in a horizontal sectional view and which slidably contacts the inner side surface of the fork protector 14. This sliding contact part 1
Protrusions 16a1 protruding laterally are integrally formed on the outer surfaces of the left and right side walls of 6a, respectively.

Further, on the inner side surface 14c of the fork protector 14, the left and right projections 16a1 are seen in a cross sectional view.
Left and right holding portions 14c1 that guide the rear surface of the vehicle are provided in a protruding manner. This holding portion 14c1 is provided with the fork protector 14
Is formed in a rib shape along the longitudinal direction of the protector guide 16 on the inner side surface 14c of the fork protector 14 by the left and right holding parts 14c1.
A guide groove 14c2 with which a is in sliding contact is formed.

The hose clamp portion 16e is a circular hole which is formed inside the sliding contact portion 16a of the protector guide 16 and which opens vertically, and has an outer wall on its inner wall so as to open together when the protector guide 16 is open. A slit 16e1 is formed along the radial direction of the tube 8. The inner diameter of the hose clamp 16e in the closed state is set to be slightly smaller than the outer diameter of the brake hose 18, for example.
The inner wall of the brake hose is dimensioned so that a predetermined gripping force can be applied to the outer circumference of the brake hose 18. When assembling the protector guide 16, the brake hose 18 is assembled in the hose clamp portion 16e, and then the protector guide 16 is fastened to the outer circumference of the outer tube 8 with the bolts 16b or the like.

As shown in FIG. 1, the brake hose 18 passes through the inside of the outer tube 8 from the brake caliper 28 and wraps around to the front side of the upper end of the outer tube 8, where it is gripped by the hose clamp 16e. Then, from the hose clamp portion 16e, on the front side of the inner tube 6, it is laid so as to extend upward along the longitudinal direction of the inner tube 6, and is inserted into the hose guide portion 14b and the hose guide 24 with a gap, and the handle The upper end is connected to the master cylinder 22 of the bar 20.

According to this embodiment having the above structure, the brake hose 18 is provided between the hose clamp portion 16e and the master cylinder 22.
4 and the hose guide portion 14b with a gap therebetween, the hose guide portion 14b and the hose guide 2 that move up and down together with the inner tube 6 when the fork operates.
Guided by 4. Therefore, the brake hose 18
The hose guide 24, the hose guide portion 14b, and the hose clamp portion 16e maintain a predetermined piping state, and are reliably protected from the sliding fork protector 14.

Further, as described above, the brake hose 18
Fork protector 1 because the pipe condition of
Reference numeral 4 denotes a sliding contact portion 16 of the protector guide 16 in its guide groove 14c2 without interfering with the brake hose 18.
a is guided and slides up and down smoothly.

Further, in this embodiment, since the hose guide 24, the fork protector 10 and the protector plate 30 forming the hose guide portion 14b are all resin molded products, the sliding of the brake hose 18 and these guide members is performed. The contact state becomes very smooth, which further improves the slidability of the fork protector 14 and can reliably protect the outer peripheral surface of the brake hose 18 from damage or the like. Further, as the slidability of the fork protector 14 is improved, the front fork 1
It goes without saying that the operability of 0 itself becomes good.

The hose clamp portion 16e for holding the brake hose 18 and the hose guide portion 14b for guiding the brake hose 18 are formed integrally with the fastening portion 14a of the fork protector 14 and the protector guide 16. Therefore, the number of parts is reduced and the configuration is simplified. Therefore, the work of fixing the protector guide 16 and the work of fastening the fork protector 14 together with the work of piping the brake hose 18 can be performed. Therefore, the assembling work and the piping work of the fork protector 14 and the brake hose 18 can be easily performed.

Further, the brake hose 18 can be released from the front fork 10 simply by removing the bolt 32 of the fastening portion 14a and the bolt 16b of the protector guide 16. Therefore, the brake hose 18, the brake caliper 28, and the master cylinder 22 are released. When removing the brake set consisting of
It is not necessary to disassemble the brake set itself from the side or the master cylinder 22 side. Therefore, the brake set can be easily attached and detached in the state where the set is integrated.

The present 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, in the present embodiment, the hose guide portion 14b is formed on the mating surface between the fork protector 14 and the protector plate 30, but in contrast to this, as in the other example shown in FIG. 30 is integrated with the fork protector 14,
The fork protector 14 itself is provided with a slit 14B1 at a position corresponding to the mating surface and the hose guide portion 14 is provided.
B may be formed. In this case, since the number of parts can be reduced by at least one protector plate 30 and one bolt 32, it is possible to provide a fork protector structure in which piping of the brake hose 18 is easy, at a lower cost.

Further, as shown in FIGS. 5 (a) and 5 (b), knurling is performed so that a plurality of vertical grooves are formed on the outer periphery of the upper end of the outer tube 8, and the knurled portion 8b is formed. The protector guide 16 may be fixed so that the protector guide 16 does not shift in the circumferential direction. Of course, as shown in FIG. 6, a knurled portion 16f may be formed on the inner peripheral wall of the protector guide 16 to enhance the effect of preventing rotation.

[0029]

As described above, according to the present invention, in the fork protector structure of a motorcycle, the slidability of the fork protector can be improved and the brake hose can be protected reliably. At the same time, the work of assembling the fork protector and the brake hose and the work of piping can be easily performed.

[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 an enlarged view taken along arrow A in FIG. 1, and FIG. 3 is an enlarged view taken along the line III-III.

3 is an enlarged cross-sectional view taken along line III-III in FIG.

FIG. 4 is a view corresponding to FIG. 2 showing another example of the hose guide portion according to the present embodiment.

FIG. 5 is a view showing another example of the outer tube according to the present embodiment, in which (a) is a side view showing the upper part of the outer tube in an enlarged manner, and (b) is a Vb-Vb cross section of the same (a). It is a figure.

FIG. 6 is a plan view showing another example of the protector guide 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 10 Front fork 12a Under bracket (equivalent to fork bracket) 14 Fork protector 14a Tightening part 14b Hose guide part 16 Protector guide 16e Hose clamp part 18 Brake hose

Claims (1)

[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. A fork protector structure for a motorcycle, which mainly protects a front fork from a pair of left and right outer tubes pivotally supporting
An upper end portion is fastened to a front portion of a fork bracket that connects the pair of left and right inner tubes, and a fork protector that extends downward from the fastening portion along the inner tube and covers at least a lower front surface of the inner tube. A protector guide that guides the inner surface of the fork protector when the inner tube slides is fixed to the upper end of the outer tube, and the protector guide is attached to the front surface of the front fork. A hose clamp that holds the outer peripheral surface of the brake hose that is piped along the hose is integrally formed, and the tightening part of the fork protector is inserted and guided when the inner tube slides. The hose guide part Characteristic motorcycle fork protector structure.