JP2005088842A - Rear wheel mudguard device for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear wheel mudguard device for a motorcycle capable of preventing the rear wheel from contacting without expanding space between a cross pipe of a rear arm and the rear wheel, and preventing longitudinal vibration in a simple shape. <P>SOLUTION: In the rear wheel mudguard device for the motorcycle, a cushion unit 14 is disposed between the rear arm 10 and a vehicle body frame 2. A mudguard sheet 27 having a plate-like flexibility is disposed so as to cover the cushion unit 14 from the rear side, an under edge part 27b of the mudguard sheet 27 is fixed to the rear frame 10, and an upper edge part 27a is fixed to an air cleaner case 7a mounted on the vehicle body frame 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a mudguard for a rear wheel of a motorcycle.

For example, an off-road type motorcycle may be provided with a mudguard device that protects the cushion unit from muddy water, bouncing stones, and the like splashed up by the rear wheel. As this type of mudguard, a mudguard is conventionally provided between the cushion unit and the rear wheel, the upper end of the mudguard is fixed to the body frame side, and the lower part is placed between the cross pipe of the rear arm and the rear wheel. A structure that is inserted and hung downward is generally used (see, for example, Patent Document 1).
JP 2001-146185 A

However, in the above-mentioned conventional device, since the lower part of the mud guard is inserted between the cross pipe and the rear wheel and is hung downward, in order to avoid contact between the mud guard and the rear wheel, It is necessary to expand the space between the rear wheels. In this case, if the cross pipe is disposed on the front side, the strength and rigidity of the entire rear arm may be affected, and conversely, if the rear wheel is disposed on the rear side, there is a problem in that the wheel base is shortened.

Further, in order to reduce the deflection of the mudguard in the front-rear direction, it is necessary to set the mudguard itself to a rigid shape, and there is a problem that the shape tends to be complicated and the cost is increased.

The present invention has been made in view of the above-described conventional situation, and can prevent contact with the rear wheel without expanding the space between the cross pipe of the rear arm and the rear wheel. An object of the present invention is to provide a mudguard for a rear wheel of a motorcycle that can be prevented.

According to the first aspect of the present invention, the rear arm that supports the rear wheel is pivotally supported by the vehicle body frame so as to be swingable up and down, and one cushion unit is disposed between the rear arm and the vehicle body frame and in the vicinity of the vehicle center line. In a mudguard for a rear wheel of a two-wheeled vehicle, a plate-like and flexible mudguard sheet is disposed so as to cover the cushion unit from the rear side, and the lower edge of the mudguard sheet is fixed to the rear arm side. The upper edge is fixed to the vehicle body frame side.

According to a second aspect of the present invention, in the first aspect, the mud removing sheet is oriented so as to be deformed into a shape that swells toward the front of the vehicle as the rear wheel strokes relatively upward. It is said.

According to a third aspect of the present invention, in the first or second aspect, the lower edge of the mud removing sheet is fixed to the upper surface of the cross pipe of the rear arm, and the upper edge is located at the bottom of an air cleaner case mounted on the vehicle body frame. It is characterized by being fixed.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the cushion unit is connected to a cylinder coupled to the vehicle body frame side and a piston slidably inserted into the cylinder. And a piston rod that projects downward from the cylinder and is connected to the rear arm, and the mud removal seat is formed so that the portion that overlaps the cylinder is narrower than the portion that overlaps the piston rod when viewed from the rear of the vehicle. It is characterized by that.

According to the mudguard apparatus of the first aspect of the present invention, a flexible mudguard sheet is disposed on the rear side of the cushion unit, the lower edge of the mudguard sheet is fixed to the rear arm side, and the upper edge is Since it is fixed to the body frame, the cushion unit covers the cushion unit from behind while absorbing and absorbing the expansion and contraction of the cushion unit accompanying the vertical swing of the rear arm. Covers the cushion unit and can surely fulfill the mudguard function, and can protect the cushion unit from muddy water, splash stones and the like splashed by the rear wheel.

Since the lower edge of the mudguard seat is fixed to the rear arm, there is no problem of contact with the rear wheel, so there is no need to increase the space between the rear arm cross pipe and the rear wheel, thus ensuring the strength and rigidity of the rear arm. This can solve the problem of a long wheelbase.

In addition, since the upper and lower edges of the mudguard sheet are fixed, the lower part of the mudguard sheet can be prevented from swinging back and forth, and it is not necessary to use a complicated shape to obtain rigidity as in the past. The shape can be reduced and the cost can be reduced.

In the invention of claim 2, since the mud removing sheet is oriented so as to bulge and deform toward the front side of the vehicle, contact with the rear wheel can be more reliably prevented.

In the invention of claim 3, since the lower edge of the mud removing sheet is fixed to the upper surface of the cross pipe of the rear arm and the upper edge is fixed to the air cleaner case, the mud removing sheet is attached without interfering with other parts including the rear arm. be able to.

In the invention of claim 4, since the portion of the mud removal sheet that overlaps the cylinder is made narrower than the portion that overlaps the piston rod, the flow of the traveling wind to the cylinder that easily generates heat due to the sliding of the piston is caused by the arrangement of the mud removal sheet. The problem of being hindered can be suppressed, and cooling of the cylinder can be ensured while providing a mud removal sheet.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 to FIG. 3 are views for explaining a rear wheel mudguard device according to an embodiment of the present invention. FIG. 1 is an off-road type motorcycle provided with a rear wheel mudguard device. 2 is a perspective view of the mud removing sheet as seen from the rear of the vehicle, and FIG. 3 is a rear view of the mud removing sheet as seen from the rear of the vehicle.

In the figure, reference numeral 1 denotes a rear arm support portion of an off-road type motorcycle, and a rear arm bracket 4b (not shown) that extends from the head pipe 3 of the body frame 4 to the vehicle diagonally downward and extends in the vertical direction and the left, An air cleaner 7 is disposed in a space surrounded by the right seat rail and the left and right seat stays 6, and the air cleaner 7 has a structure in which an element for filtering air (not shown) is disposed in an air cleaner case 7a. belongs to.

A rear arm 10 is pivotally supported by a pivot shaft 11 at a rear lower end portion of the rear arm bracket 4b, and a rear wheel 12 is pivotally supported at a rear end portion of the rear arm 10. The rear arm 10 has a structure in which a square tube-like cross pipe 10b is coupled between front end portions of left and right arm portions 10a and 10a. This cross pipe 10b is arranged as close as possible so that the gap with the front edge of the rear wheel 12 is minimized, thereby shortening the wheel base and ensuring the necessary strength and rigidity of the rear arm 10 as a whole. ing.

A chain case 5 is disposed on the left arm portion 10a to cover the top of the drive chain. The front edge 5a of the chain case 5 is located on the upper surface of the cross pipe 10b.

One inverted cushion unit 14 is disposed between the vehicle body frame 4 and the rear arm 10 and on the vehicle center line. The cushion unit 14 is connected to a cylinder 15 connected to the rear upper end bracket 4a of the rear arm bracket 4b and a piston (not shown) slidably inserted into the cylinder 15 so as to move downward from the cylinder 15. A piston rod 16 projecting from the piston rod 16, a coil spring 17 disposed between a spring seat 16 a fixed to the piston rod 16 and a spring seat 15 a fixed to the cylinder 15, the piston rod 16 and the rear arm 10 is provided.

The link mechanism 18 connects a pair of left and right first links 20 pivotally supported on the lower end of the rear arm bracket 4b and a second link 21 pivotally supported on the lower surface of the cross pipe 10b. The link 20 has a schematic structure in which the link portion 16b of the piston rod 16 is connected.

A mudguard sheet 27 constituting a mudguard device is disposed on the rear side of the cushion unit 14. The mud removing sheet 27 is a rectangular plate and is made of rubber or resin having flexibility, and the lower half of the cylinder 15 of the cushion unit 14 and the substantially exposed length of the externally exposed portion of the piston rod 16 are rearward. It is formed so as to cover from. The upper half of the cylinder 15 is covered from behind by an air cleaner case 7a, and the spring seat 16a portion of the piston rod 16 is covered from behind by a cross pipe 10b. This prevents the muddy water, the jumping stone, and the like splashed by the rear wheel 12 from hitting the cushion unit 14.

The upper edge portion 27a of the mud removal sheet 27 is fixed to the air cleaner case 7a, and the lower edge portion 27b is fixed to the upper surface of the cross pipe 10b. A vertical rib 7 b is integrally formed on the bottom wall of the air cleaner case 7 a, and an upper edge portion 27 a of the mud removing sheet 27 is fixed to the vertical rib 7 b via two clips 23 and 23. The lower edge portion 27b is detachably fastened and fixed to the cross pipe 10b by two screw members 24, 24.

The mud removal seat 27 is bent and formed in a generally square shape so as to slightly swell toward the front of the vehicle when viewed in a non-riding state, and as a result, the rear wheel 12 strokes relatively upward. The rear arm 10 is oriented so as to deform into a shape that swells to the front side of the vehicle when the rear arm 10 swings upward.

Next, the effect of this embodiment is demonstrated.

According to the mudguard device of this embodiment, the mudguard sheet 27 made of flexible rubber or resin is disposed on the rear side of the cushion unit 14, and the lower edge portion 27 b of the mudguard sheet 27 is connected to the rear arm 10. Since the upper edge 27a is fixed to the air cleaner case 7a, the expansion and contraction of the cushion unit 14 accompanying the up and down swing of the rear arm 10 is bent and deformed to absorb the expansion and contraction. The unit 14 is covered from the rear, so that the mudguard function can be achieved over the entire vertical stroke of the rear arm 10, and the cushion unit 14 can be protected from muddy water, bouncing stones, and the like splashed by the rear wheel 12.

Since the lower edge portion 27b of the mud removing sheet 27 is fixed to the cross pipe 10b of the rear arm 10, there is no problem that the mud removing sheet 27 contacts the rear wheel 12, and the cross pipe 10b of the rear arm 10 and the rear wheel 12 There is no need to increase the space between them, and therefore the cross pipe 10b can be arranged close to the rear wheel 12, and the strength and rigidity of the rear arm 10 as a whole can be secured, and the wheel base can be prevented from becoming long.

Further, since the upper and lower edge portions 27a and 27b of the mud removing sheet 27 are fixed, the lower part of the mud removing sheet 27 does not swing back and forth, and it is necessary to form a complicated shape to obtain rigidity as in the prior art. There is no need, and a simple plate shape is sufficient, and the cost can be reduced. That is, in order to obtain a complicated shape in order to obtain rigidity as in the prior art, there is a problem that a mold having a complicated shape is required and the cost increases accordingly.

In the present embodiment, the mud removing sheet 27 is bent so as to bulge toward the front of the vehicle, and the mud removing sheet 27 is oriented so as to bulge and deform toward the front as the rear wheel 12 strokes relatively upward. Therefore, contact with the rear wheel 12 can be reliably prevented.

Further, the lower edge portion 27b of the mud removal sheet 27 is fixed to the upper surface of the cross pipe 10b, and the upper edge portion a7b is fixed to the vertical rib 7b integrally formed on the bottom wall of the air cleaner case 7a. The mud removal sheet 27 can be attached without interfering with parts.

Here, as a protection structure of the cushion unit 14, it is conceivable to extend the front edge 5a portion of the chain case 5 inward in the vehicle width direction so as to cover the cushion unit 14 from the rear side. The extension portion moves up and down together with the rear arm 10, and since it is necessary to avoid interference with other on-vehicle components, the size is limited and it is difficult to obtain a sufficient protection function.

In the above embodiment, the case where the mudguard sheet is formed in a square shape has been described. However, in the present invention, as shown in FIG. 3, the cylinder 15 of the cushion unit 14 of the mudguard sheet 27 as viewed from the rear of the vehicle. The portion overlapping with the piston rod 16 may be formed narrower than the portion overlapping with the piston rod 16. That is, you may form the notch parts 27c and 27c which make the part which overlaps the cylinder 15 of the mud removal sheet | seat 27 narrow.

In this case, it is possible to suppress the flow of the traveling wind to the cylinder 15 that easily generates heat due to the sliding of the piston from being hindered by the mounting of the mudguard sheet 27, and when the mudguard sheet 27 covers the cylinder 15. The influence on cooling performance can be suppressed.

1 is a side view of a motorcycle provided with a mudguard according to an embodiment of the present invention. It is a perspective view of the mud removal sheet seen from the vehicle back. It is a rear view of the mud removal sheet seen from the vehicle back.

Explanation of symbols

1 Motorcycle 4 Body frame 7a Air cleaner case 10 Rear arm 10b Cross pipe 12 Rear wheel 14 Cushion unit 15 Cylinder 16 Piston rod 27 Mud removing seat 27a Upper edge 27b Lower edge 27c Notch (narrow)

Claims (4)

A rear wheel mudguard for a motorcycle, in which a rear arm supporting a rear wheel is pivotally supported by a vehicle body frame so as to be swingable up and down, and a cushion unit is disposed between the rear arm and the vehicle body frame and in the vicinity of a vehicle center line. A flexible mud removing sheet is disposed so as to cover the cushion unit from the rear side, the lower edge of the mud removing sheet is fixed to the rear arm side, and the upper edge is fixed to the body frame. A mudguard device for a rear wheel of a motorcycle characterized by being fixed to the side. 2. The rear wheel of a motorcycle according to claim 1, wherein the mud removing sheet is oriented so as to deform into a shape that swells toward the front of the vehicle as the rear wheel strokes relatively upward. Mudguard device. 3. The lower edge of the mud removing sheet according to claim 1, wherein the lower edge is fixed to the upper surface of the cross pipe of the rear arm, and the upper edge is fixed to the bottom of an air cleaner case mounted on the vehicle body frame. A mudguard for rear wheels of motorcycles. The cushion unit according to any one of claims 1 to 3, wherein the cushion unit is connected to a cylinder coupled to the vehicle body frame side and a piston slidably inserted into the cylinder and protrudes downward from the cylinder. A motorcycle comprising: a piston rod coupled to a rear arm; and the mud removal seat is formed so that a portion overlapping the cylinder is narrower than a portion overlapping the piston rod when viewed from the rear of the vehicle. Rear wheel mudguard.

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