JPH02254082A - Front fender support structure for motor bicycle - Google Patents

Abstract

PURPOSE:To improve strength and rigidity of a support itself by a method wherein support plates extended downward from both sides of a front fender are bent approximately in V-shape in plane cross section, and the outer side of the front part thereof is inclined rearwardly sideways. CONSTITUTION:A front fender 9 made of carbon FRP with which the upper outer periphery of a front wheel 6 has support plates 25 extending downward from both sides between outer tubes 20 and 20 on both sides of a front fork 5. A support arm 11 is protruded upward from the front part of a wheel bracket 22, and the lower end of the support plate 25 is mounted to the support arm 26 by means of a pair of upper and lower bolts 27. In this case, the support plate 25 is bent approximately in V-shape in plane cross section. A front outer surface 34 of the bent part is inclined such that it is gradually pointed to the outside toward the rear, and a rear outer surface 35 is formed such that it is positioned facing the front of an inner tube 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a front fender support structure for a motorcycle.

(Prior art) In a motorcycle, a front fork having a shock absorbing function is supported on a head pipe of a body frame so as to be steerable, a front wheel is supported on the lower end of the front fork, and the upper outer peripheral surface of the front fork is supported on the lower end of the front fork. Many models are equipped with a front fender that covers the front fender. Additionally, in this case, the front fork usually includes a pair of left and right outer dups and inner dups that are slidably fitted together in the axial direction, and the two tubes slide against each other to absorb the impact that is transmitted from the front wheel to the head pipe side. By doing so, it is absorbed.

In addition, some of the above-mentioned front forks are of the so-called inverted type, in which an outer tube with a larger diameter than the inch duplex is supported on the head pipe side for strength reasons, and a smaller diameter inner tube is supported on the lower end side of each outer duplex. There is one in which a tube is inserted and the front wheel is supported at both lower ends of the left and right inner tubes.

Furthermore, there is a system in which the relative position of the front wheel and the front fender does not change when the outer tube and the inner tube slide against each other, and in this case, the configuration is as follows: Support plates are provided protruding downward from both sides 1, and this δ
The protruding ends of the support plates are respectively attached to the corresponding lower ends of the inner tube. That is, the front wheel and the front wheel/fender are integrated through the lower end of the inner duplex, and the relative positions of these two parts do not change.

(Problems to be Solved by the Invention) However, the above configuration has the following problems6. Namely, firstly, in order to ensure that the front fender can sufficiently withstand the impact while driving, the support plate is Although sufficient strength is ensured, in this case, simply reinforcing the support plate may make the support plate heavy and affect maneuverability.

Secondly, while driving on a flat road surface, the lower end of the inner tube is elastically projected downward from the lower end of the outer tube, and the lower end of this inner tube is exposed to the outside. When the front wheels receive a shock from the road surface, the lower end of the inner duplex slides into the outer duplex. Therefore, for example, in order not to damage the sealing material between the two tubes, it is necessary to keep the outer peripheral surface of the inner tube from being damaged and keep it smooth.

However, since the inner tube is located at the lower part of the front fork and close to the road surface, there is a risk that the outer circumferential surface of the inner tube may be easily damaged by being hit by thrown up stones or the like.

Thirdly, each of the inner tubes is located on the outer side of the front wheel, that is, these inner tubes are located in places where they are likely to be directly hit by the wind. For this reason, there is a disadvantage that air resistance increases unnecessarily and aerodynamic characteristics deteriorate.

(Object of the Invention) This invention has been made in view of the above-mentioned circumstances. Firstly, it is possible to achieve strong support for the front fender with light agitation, and secondly, it is possible to achieve strong support for the front fender with light agitation. A third purpose is to prevent the outer circumferential surface of the tube from being damaged by collisions with thrown up stones, etc., and thirdly, to suppress an increase in air resistance due to the inner tube.

(Structure of the Invention) A feature of the present invention for achieving the above object is that the support plate is bent so that its planar cross section is approximately doglegged, and the support plate is placed near the front of the inner tube. The convex side of the bent portion of the support plate is made to face the outside of the vehicle body, and the front outer surface of the support plate is inclined so as to face outward I11 as it goes rearward.

(for production) The effects of the above configuration are as follows.

The support plate 25 is bent so that its planar cross-section and surface are approximately doglegged. Therefore, the section modulus of this support plate 25 increases, that is, this support plate 2
The strength and rigidity of 5 itself is improved. Therefore, the front fender 9 is firmly supported by the inner tube 21 by the support plate 25.

In the above case, the strength of the support plate 25 can be improved by simply bending the support plate 25, and therefore no separate reinforcing material is required. This is achieved by preventing the support plate 25 from becoming heavy.

Further, the support plate 25 is located near the front of the inner tube 21, so that if a stone is thrown up from the front while driving, the stone will not collide with the inner tube 21. This will be blocked by the support brace 25.

Since the front outer surface 34 of the support plate 25 is inclined outward toward the rear, the traveling wind A is smoothly guided outward and rearward by the front outer surface 34, that is, J! runs on the inner tube 21 located behind the support plate 25! A direct hit by IA is prevented.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In Figure 2, 1 is a motorcycle, and this motorcycle l
The vehicle body frame 2 has a head vibrator 3 at its front part.

A front fork 5 is supported on the head vibe 3 so as to be steerable, a front wheel 6 is supported on the lower end of the front fork 5, and a handle 7 is attached to the upper end. Further, a front fender 9 is provided to cover the upper outer peripheral surface of the front wheel 6, and a disc brake 1o for the front wheel 6 is also provided.

In addition, 12 is an engine, 13 is a fuel tank, and 14 is a radiator. Reference numeral 15 denotes a cowling, and this cowling 15 covers the front surface of the front fork 5 above the front fender 9, and the outer surfaces of the vehicle body frame 2, engine 12, and the like. Further, 16 is a road surface.

The front fork 5 will be explained with reference to FIGS. 1 to 4.

The front fork 5 has a steering shaft (not shown) that is fitted into the helmet vibrator 3 so as to be rotatable about its axis. The head vibe 3 also protrudes from each lower end of this steering shaft, and an upper bracket 18 is attached to the upper end of this steering shaft, while a lower bracket 19 is attached to the lower end. A pair of left and right outer tubes 20.201J (made of aluminum) are fixed to these upper bracket I8 and lower bracket I9. It is rotatably supported on the side.

Furthermore, a pair of left and right inner tubes 21 and 21 made of Sudil are fitted into the lower end of each of the outer tubes 20 so as to be slidable in the axial direction. This valley inner tube 21 has a small axle bracket 22 made of aluminum at its lower end, and the front wheel 6 is supported on this axle bracket 22 via an axle 23.

While driving when the road surface 16 is flat, the lower end side of each inner tube 21 is elastically projected downward from the lower end of the outer tube 20, and the front wheel 6 receives a shock from the road surface 16. Inner tube 2]
is inserted into the outer duplex 20 while sliding (shown in phantom lines in FIG. 1), so that the above-mentioned impact is absorbed.

1 to 4, the front fender 9 is made of carbon or FRP, and is provided between the left and right outer tubes 20 and 20, and the front fender 9 has a front fender 9 that extends downward from the left and right sides of the front fender 9, respectively. A support plate 25 is integrally provided in a protruding manner. On the other hand, a support arm 26 is provided to protrude upward from the front part of the axle bracket 22, and a pair of upper and lower bolts 2 are attached to this support arm 26.
The lower ends of each of the support plates 25 are screwed by screws 7 and 27. And with this, 1. The front fender 9 and the inner tubes 21 and 214 are supported.

Further, the disc brake 10 has a brake disc 29 that rotates together with the front wheel 6, and a pair of calipers 30 that clamp the brake disc 29 and perform braking are attached to a pair of support arms 31 that protrude from the rear of the axle bracket 22. It is screwed down with bolts 32 and 32.

The support plate 25 will be described in detail below with reference to all the figures.

This support plate 25 is bent so that its planar cross section is substantially doglegged, and this gives it sufficient strength and rigidity to support the front fender 9. ing. Further, this support plate 25 is located near the front of the inner tube 21, so that if a thrown up stone or the like flies from the front while driving, this stone will not collide with the inner tube 21. The support plate 25 will block this.

Further, the support plate 25 is formed so that the convex side of the bent portion of the support plate 25 faces toward the outside of the vehicle body, and the front outer surface 34 located in the front half of the support plate 25 is formed as it goes toward the rear. A rear outer surface 35, which is inclined outward and located in the rear half of the support plate 25, extends in the vehicle width direction and faces the lower part of the outer tube 20 and each front surface of the inner tube 21.

Therefore, the traveling wind A is smoothly guided outward and rearward by the front outer surface 34, that is, the traveling wind A is prevented from directly hitting the lower end of the outer tube 20 or the inner tube 2I.

A recess 36 is formed at the rear of the front outer surface 34 at the lower end of the support plate 25, and this recess 36 is screwed to the support arm 26 by the bolt 27 as described above. In this case, the bolt 27 is hidden behind the front outer surface 34 when viewed from the front.

Further, the lower end of the support plate 25 is closed by a bottom plate 37 that is integrally formed with the support plate 25. That is, the bottom plate 37 also improves the strength of the lower end of the support plate 25.

Furthermore, the support plate 25 is reinforced in the following manner.

That is, as shown in FIGS. 1, 6, 8, and 9, a hard foam material 3 is provided on the inner surface of the front part of the support plate 25.
9 is firmly attached.

The upper part of this hard foam material 39 is attached to the upper surface of the front fender 9, and the lower part is attached to the inner surface of the recess 36 and the bottom plate 3.
7 is also firmly attached to the top surface.

Further, another hard foam material 40 is firmly attached to the rear inner surface of the support plate 25 as well. Each of the rigid foam materials 39 and 40 is further covered with a carbon Kevlar cloth 41, which is an aramid fiber, and is thereby more firmly fixed to the support plate 25.

Although the above is based on the illustrated example, the front fender 9 and the support plate 25 may be separate bodies, and the front outer surface 34 may be a convex arc surface or a concave arc surface.

(Effects of the invention) According to this invention, there are the following effects. That is, firstly, since the support plate is bent so that its planar cross section is approximately doglegged, the section modulus of the support plate increases, which improves the strength and rigidity of the support plate itself. . Therefore, the front fender is firmly supported by the inner tube by the support plate 25.

In the above case, the strength of the support plate can be improved by simply bending the support plate, and therefore no separate reinforcing material is required. This is achieved by preventing things from happening.

Therefore, even if the front fender is strongly supported, the problem of affecting maneuverability is prevented from occurring.6 Also, secondly, since the support plate is located near the front of the inner tube, If a stone is thrown up from the front while the vehicle is running, the support plate prevents the stone from colliding with the inner tube. Therefore, damage to the inner tube is prevented.

Moreover, as mentioned above, the support plate has been designed to improve its strength, so it can withstand the impact of the stones mentioned above, and therefore, the support plate prevents stones from colliding with the inner tube. Definitely prevented.

Furthermore, thirdly, since the front outer surface of the support plate is inclined outward toward the rear, the traveling wind is smoothly guided outward and rearward by the front outer surface.
That is, the running wind is prevented from directly hitting the inner tube located behind the support plate. Therefore, the increase in air resistance is suppressed to that extent, which is beneficial in terms of aerodynamic characteristics.

(Margin below)

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a partially enlarged view of Fig. 2, Fig. 2 is an overall side view of the motorcycle, Fig. 3 is a perspective view of the front of the vehicle body, and Fig. 4 is a front fender. and a partial front view of the support plate, FIG. 5 is a sectional view taken along the line V-V in FIG. 1, FIG. 6 is an enlarged view taken along the line Vl-Vl in FIG. FIG. 8 is a partially enlarged view of FIG. 7, and FIG. 9 is a sectional view taken along the line ■--■ in FIG. 1. Motorcycle, Head pipe, 5. Front wheel, 9. Front tube, 21. Support plate, 34. 2. Body frame, 3. Front fork, 6. Fender, 20. Aligner. Tube, 25. - Front lateral surface. No change in the introduction and content of the drawing) Engraving of the drawing (no change in the content) ♂'Rokuyo: 2 No changes) Funeral map Figure 5 Teitouri Ne Yumasa (outside (method) Yoshiki, Commissioner of the Patent Office 1) Written by Seiden 1, 'fr Display Heisei J Patent Application No. 72935 2 Title of the invention: Front fender support structure for motorcycles 3° Person who makes the correction Relationship to the matter Patent applicant Address (residence) 2500 Shingai, Iwata City, Shizuoka Prefecture Name (
Name) (AO71 Yamahachi Motor Co., Ltd. 4 Agent 5.31 Address 3-20-9-6 Toyosaki, Kita-ku, Osaka
Subject of amendment 7, Contents of amendment Drawing procedure Nesannosho ([=1 shot) Director General of the Patent Office Yoshi 1) Bun Sadono 1, Indication of the case Kosei 1st Patent Application No. 72935 2, Name of invention Motorcycle Front fender support structure 3, relationship with the case of the person making the amendment Patent applicant address and residence) Name (2500 Shingai, Iwata City, Shizuoka Prefecture)
Name) [AO7) Yamaha Motor Co., Ltd. 4,
Agent 〒531 Address 3-20-9 Toyosaki, Kita-ku, Osaka-shi Application form for 6 amendments (Figures 5, 7 to 9 attached hereto are amended as shown in the attached sheet.) [1. ) Figure 7 Δ Figure 9

Claims (1)

[Claims] 1. The front fork includes a pair of left and right outer tubes that are supported on the head pipe side of the vehicle body frame, and a pair of left and right inner tubes that are fitted into the lower end of each of these outer tubes so as to be slidable in the axial direction. The front wheel is supported at both lower ends of the inner tube, a front fender is provided between the left and right outer tubes, support plates are provided to protrude downward from both left and right sides of the front fender, and the protruding ends of each support plate are Corresponding to this, in a motorcycle attached to the lower end of the inner tube, the support plate is bent so that the planar cross section is approximately doglegged, and the support plate is positioned near the front of the inner tube. A front fender support structure for a motorcycle, in which the convex side of the bent portion faces outward of the vehicle body, and the front outer surface of the support plate is inclined outward as it goes rearward.