JPH0742951Y2 - Rear fork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rear fork arranged on the rear end side of a vehicle body frame of a motorcycle.

[Prior Art] Generally, a rear fork is a component of a rear suspension, and plays a role of supporting rear wheels. The portion that directly supports the rear wheel is an end piece that is cast and formed separately from the rear fork body. Further, one end of this end piece is inserted into a hollow rectangular tubular reinforcing member that is previously inserted into the rear end opening of the rear fork main body, and is integrally joined by bolts or the like. The end piece is provided with a long hole having a long diameter in the longitudinal direction, and a rear axle for supporting a hub of a rear wheel penetrates through the long hole. An example of such a material is disclosed in JP-A-60-222383.

[Problems to be Solved by the Invention] By the way, since the end piece in the conventional rear fork has to intervene the reinforcing member when it is connected to the rear fork main body, the number of parts is accordingly increased, and the weight and cost are increased. Get higher

An object of the present invention is to provide a rear fork capable of reducing the number of parts and weight and reducing the cost by making a new formation and mounting structure of the end piece.

[Means for Solving Problems] The rear fork of the present invention has the following configuration. That is, in a rear fork having an end piece fixed to the rear end of a rear fork main body having a hollow portion arranged on the rear end side of a vehicle body frame, the end piece is manufactured using a metal drawing material and is formed on the front end side thereof. The mounting end of the end piece has a substantially rectangular shape with a substantially rectangular shape and the rear portion of the mounting end has a substantially U-shaped cross section with one side plate removed. A rear fork in which a portion is inserted into a rear end opening of the rear fork main body to fix a joint portion between the two, and upper and lower lateral protrusions of the substantially U-shaped cross section are ribs, and The part that connects the ribs vertically is used as the rear axle fixing part, and a hole for supporting the rear axle is formed through this rear axle fixing part, and the mounting end is pulled by the end piece. It has a central hole and an end hole which are opened in the pulling direction and which are independent of each other. Is formed at a position deviated toward the long side of the portion, and by the deviation of the central hole, a thin side plate and a thick side plate are formed with the central hole sandwiched therebetween, and the thick side plate has a larger plate thickness than the thin side plate and Continuing with the rear axle fixing portion of the substantially U-shaped cross section, the end hole,
A laterally elongated shape is formed between a short side of the mounting end and an extension of the rib, and extends in the left-right direction longer than the central hole.

[Operation] In the rear fork according to the present invention, since the mounting end of the end piece having a substantially hollow angular shape is inserted and fixed in the rear end opening, the conventional hollow reinforcing member can be omitted, and the end piece has various configurations. Since the part is a single member that is integrated,
The number of parts is reduced and production efficiency is improved. further,
Since the rear part of the mounting end has a substantially U-shaped cross section, the upper and lower plates of the end piece serve as reinforcing ribs to ensure the required strength, and the weight is reduced by removing one side plate. is doing.

Further, since a thick side plate having a large plate thickness is formed by the deviation of the central hole and the thick side plate is connected to the rear axle fixing portion of the substantially U-shaped cross section, in the case where such a deviation is not caused It is possible to further improve the strength of the rear axle supporting portion as compared with.

Further, since the end hole is formed in a horizontally long shape and is formed between the short side of the mounting end and the extended portion of the rib, after the pull-out molding of the pull-out member, remove from the vertical end to the end hole. However, since the rib remains between the central hole, both weight reduction and strength improvement can be realized.

Moreover, since the end hole extends longer than the central hole in the left-right direction, the hole can be lightened as much, which contributes to weight reduction.

[Embodiment] The present invention will be described in detail below with reference to an embodiment shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of a rear fork according to the present invention. The rear fork main body 1 is made of a metal withdrawal material and the like, and a pivot pipe 2 fixed to the tip thereof is rotatably attached to the rear end of a vehicle body frame (not shown). The rear fork body 1 is formed in a hollow square shape, and a cross member 3 as a reinforcing member is arranged between the left and right rear fork bodies 1. The cross member 3 extends in the lateral direction of the vehicle.

An end piece 5 is provided at the rear end opening 4 of the rear fork body 1.
Are fixed by welding. However, it is also possible to form the rear fork with a synthetic resin, and in this case, a means such as adhesion is used.

The end piece 5 is formed of a member having a substantially hollow square shape, and the mounting end portion 9 formed on the front end side has a hollow rectangular cross section having a substantially vertically long quadrilateral shape. The existing one side plate is removed.

Therefore, the end piece 5 is configured such that the rear portion thereof from the mounting end portion has a substantially U-shaped cross section. A chain pulling metal 6, which will be described later, is attached to the rear end of the end piece 5.

A rear axle 7 is provided so as to pass through the left and right end pieces 5 in a transverse manner, and its protruding end is fastened with a nut 8. The rear axle 7 is configured to pivotally support a hub of a rear wheel (not shown).

Further, the mounting end 9 of the end piece 5 is welded with the tip inserted into the opening end 4 of the rear fork 1. In the end piece 5, of the substantially U-shaped cross section,
The upper and lower lateral protrusions are ribs 10 and 11, and these ribs
A rear axle fixing portion 12 is a portion connecting the upper and lower portions 10 and 11, and the ribs 10 and 11 serve as reinforcing members.

The rear axle fixing portion 12 of the end piece 5 is provided with an elongated hole 13 formed to have a long diameter in the longitudinal direction, and the rear axle 7 penetrates the elongated hole 13.

The chain pulling metal 6 attached to the rear end of the end piece 5 adjusts the front-back position of the rear axle 7 so that the chain (not shown) is always kept at a constant tension.

This metal fitting 6 is an opening formed in the rear wall 14 of the end piece 5.
It is fastened and fixed to 15. In the figure, the end piece 5 is already welded and fixed to the right rear fork body 1.

It should be noted that the attachment end portion 9 has central holes which are formed at the time of pulling out the end piece 5 and are independent from each other and open in the pulling direction.
16 and end holes 17, the central 16 hole has a vertically elongated opening, is approximately the center of the end piece 5 in the vertical direction, and is thin in the left-right direction from the center to the long side of the mounting end 9. Side plate 18
It is formed at a position deviating toward the side.

Due to the deviation of the central hole 16, the thin side plates sandwiching the central hole 16
18 and a thick side plate are formed, and the thick side plate is thicker than the thin side plate 18 and is continuous with the rear axle fixing portion 12 having the substantially U-shaped cross section. The thick side plate, that is, the rear axle fixing portion 12 is formed to have a thickness slightly larger than that of the same function portion in the related art or to be equal to that in the related art.

The end hole 17 has a horizontally long shape and is formed between the upper plate 19 which is the upper short side of the mounting end 9 and the extension of the rib 10.
It extends longer than 16 in the left-right direction (vehicle width direction), and its inner end portion, that is, the vehicle body center side end portion, extends inward from the outer surface of the rear axle fixing portion 12. Reference numeral 20 is a lower plate that is the lower short side of the mounting end 9.

By doing so, the plate thickness of the rear axle fixing portion 12 can be made larger than the plate thickness of the thin side plate 18 (a part continuous with one side plate to be removed) due to the deviation of the center hole 16, so that the center hole 16 is displaced. Rear axle support 12 compared to when not
The strength of can be further improved.

In addition, the end hole 17 has a horizontally long shape, and the upper plate of the end piece 5
Since it is formed between 19 and the extension of the rib 10, the rib 10 remains between the center hole 17 even after removing the upper plate 19 to the end hole 18 after the drawing member is drawn and molded, so it is lightweight. Both improvement and strength can be realized.

Moreover, since the end hole 17 extends longer than the central hole 16 in the left-right direction, it is possible to reduce the amount of light and contribute to weight reduction.

Therefore, the end piece 5 has no problem in terms of strength even if the side plate on one side (extension of the thin side plate 18) is removed.
The strength suitable for the load applied to the end piece 5 can be secured,
At the same time, it has achieved weight reduction.

Further, since the conventional hollow reinforcing member is integrated as the mounting end portion 9 by utilizing the drawing material, the end piece 5 becomes a single member, and the number of parts can be reduced to only one, and the number of production steps is small. Therefore, the production efficiency is improved.

[Advantages of the Invention] In the rear fork according to the present invention, the end piece is manufactured by using a metal drawing material, and the mounting end formed on the front end side of the rear fork has a substantially hollow corner shape, and is rearward from the mounting end. One side plate was removed from the portion to form a substantially U-shaped cross section, and the mounting end portion of the end piece was inserted into the rear end opening portion of the rear fork body to fix the joint portion between the two.

Therefore, by using the drawing material, the end piece becomes a single member that integrates the conventional hollow reinforcing member as the mounting end, and the number of parts of the end piece can be reduced to only one, which reduces the number of production steps. , The production efficiency is improved.

In addition, the rear part from the mounting end has a substantially U-shaped cross section with one side plate removed, so the upper and lower plates also serve as reinforcing members and ensure strength suitable for the load applied to the end piece. It is possible to achieve weight reduction at the same time.

Further, since a thick side plate having a large plate thickness is formed by the deviation of the central hole and the thick side plate is connected to the rear axle fixing portion of the substantially U-shaped cross section, in the case where such a deviation is not caused It is possible to further improve the strength of the rear axle supporting portion as compared with.

Further, since the end hole is formed in a horizontally long shape and is formed between the short side of the mounting end and the extension portion of the rib, after the pulling-out molding of the pulling member, it is removed from the vertical end to the end hole. In addition, since the rib remains between the central hole, both weight reduction and strength improvement can be realized.

Moreover, since the end hole extends longer than the central hole in the left-right direction, the hole can be lightened as much, which contributes to weight reduction.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a rear fork according to the present invention. (Explanation of symbols) 1 ... Rear fork main body, 4 ... Rear end opening, 5 ... End piece, 7 ... Rear axle, 12 ... Side plate, 13 ...
Long hole.

Claims (1)

[Scope of utility model registration request] 1. A rear fork in which a rear fork main body having a hollow portion arranged at the rear end side of a vehicle body frame and having an end piece fixed thereto is manufactured by using a metal drawing material, and the front end thereof is manufactured. The mounting end formed on the side has a substantially hollow quadrangular shape having a vertically long substantially quadrilateral shape, and the rear portion from the mounting end has a substantially U-shaped cross section with one side plate removed, and the end piece In the rear fork in which the mounting end portion of is inserted into the rear end opening portion of the rear fork main body and the joint portion of the two is fixed, the upper and lower lateral protruding portions of the substantially U-shaped cross-section portion are ribs,
The portion connecting these ribs vertically is used as a rear axle fixing portion, and a hole for supporting the rear axle is formed through this rear axle fixing portion, and the mounting end portions are independent from each other and open in the pull-out direction of the end piece. A central hole and an end hole are provided, and the shape of the opening of the central hole is a vertically long shape, and the end piece is substantially vertically centered, and the left-right direction is displaced from the center toward the long side of the mounting end. The thin side plate and the thick side plate are formed by sandwiching the central hole due to the deviation of the central hole, and the thick side plate has a plate thickness larger than that of the thin side plate and has a substantially U-shaped cross section. Continuing with the rear axle fixing portion, the end hole has a laterally elongated shape and is formed between the short side of the mounting end and the extension of the rib, and extends longer in the left-right direction than the central hole. Tosu Rear fork.