JPH01317886A - Seat frame of motorcycle - Google Patents

Abstract

PURPOSE:To reduce the number of parts without needing a cross member or the like formed of the other members by molding integrally a seat rail, back stey, cross member, mounting boss and mud guard incorporated in each other. CONSTITUTION:A seat frame 1 is constituted of main body frames 2, 2 formed in a reversed triangle to provide combined seat rail and back stay, cross members for connecting the frames 2, 2 to each other and a connecting section 3 used also for a mud guard of rear wheel. These members are molded integrally and divided left and right symmetrically into left and right frames 5, 6 by a dividing surface 4 on the center axis X of a car body. Both frames 5, 6 are welded to each other on the dividing surface 4 to assemble the integral seat frame 1. Thus, the number of parts and the working operations of each frame portion are reduced to diminish assembling man hours and cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seat frame for a two-wheeled motor vehicle, in which a seat frame connected to an intermediate upper part of a main frame and extending rearward is integrally formed by casting or the like.

(Prior Art) As an alternative to the conventional seat frame constructed by welding pipes, for example, the one described in JP-A-62-96185 is known. Installation 1 Both the left and right frames with an inverted triangular truss structure, which also serve as a pair of left and right seat rails and a backstay that extend rearward by pressing, are formed by press processing, and three cross members are passed between the upper surfaces of the two frames. These are bolted together, and mounting bosses for various parts are welded to the left and right frames, and various brackets, stays, etc. are attached to the mounting bosses, and the cross is surrounded by the left and right frames and the cross member. The space below the member is used as the rocking space for the rear wheel.

(Problems to be Solved by the Invention) In the above-mentioned seat frame, each cross member and each mounting boss are formed and assembled separately, so the number of parts increases, and the process for assembling the cross member and each mounting boss is The number of man-hours in the welding process increased, leading to a decrease in productivity.

On the other hand, since the lower space of the cross member is used as a swinging space for the rear wheels and a mudguard is provided in this space, the upper edges of both the left and right frames are used especially in off-road motorcycles where the rear wheels swing widely. The seat height had to be positioned relatively upward, which inevitably resulted in a problem of increased seat height.

The present invention focuses on recent advances in casting technology, etc., and creates a seat frame for motorcycles that integrally molds the seat frame to reduce the number of parts as much as possible, improve productivity, and reduce costs. The first object of the invention is to provide a seat frame for a two-wheeled motor vehicle, the second object of which is to provide a seat frame for a two-wheeled motor vehicle that is easy to mold, and which improves fixing performance by keeping the seat height relatively low. A third object is to provide a seat frame for a motorcycle, and a fourth object is to provide a seat frame for a two-wheeled motor vehicle in which a front part of a mudguard is also integrally molded.

(Means for Solving the Problems) In order to achieve the above object, the invention of claim 1 provides a seat frame having a front end connected to an intermediate upper part of a main frame and extending rearward, in which a seat rail and a backstay are connected to each other. In the invention of claim 2, the cross member of the seat rail, the mounting bosses of various parts provided on the seat rail and the backstay, and the mudguard of the rear wheel are integrally molded. In a seat frame that connects the front end to the middle upper part of the frame and extends rearward, the seat rail, the back stay, the cross member of the seat rail, the mounting bosses of various parts installed on the seat rail and the back stay, and the mud prevention The vehicle is characterized in that the support is integrated, a member is formed by splitting it in the left-right direction along a split surface along the vehicle length direction, and the members are joined together.

Further, the invention according to claim 3 is characterized in that, in the mudguard for the rear wheel, a mudguard portion located above the rear wheel at the bottom of the rear seat is recessed upward. And furthermore,
The invention according to claim 4 is characterized in that a downward baffle plate extending across the seat frame is integrally formed in front of the mudguard portion.

(Function) By incorporating and molding the seat rail, backstay, cross member, mounting boss, and mudguard into one piece as claimed in claim 1, there is no need to form these cross members etc. as separate members, and the number of parts can be reduced. can be extremely reduced, and accordingly, the process of assembling the mudguard can be omitted, and the number of joints of cross members and mounting bosses can be extremely reduced. By combining and assembling the divided parts that have been molded into one piece by incorporating each part,
The shape of each divided member can be simplified to facilitate molding.

Further, if the mudguard portion located at the lower part of the rear seat is formed to be recessed upwards in the seat frame as in claim 3, the entire seat frame can be attached to the lower part of the seat frame due to the recess. The height of the front seat can be kept relatively low.

Furthermore, if a downward baffle plate that crosses the seat frame is integrally formed in front of the mudguard portion as in claim 4,
The muddy water etc. thrown up by the rear wheels travels through the baffle plate and falls downward, making it possible to prevent the muddy water etc. from splashing on attached equipment etc. located in front of the baffle plate.

(Example) Examples of the present invention will be described.

Referring to FIGS. 1 to 4, reference numeral 1 indicates a seat frame made of alloy to the extent that it is connected to the middle upper side of the main frame F. Boss Pa.

A pair of body frame portions 2.Pa are connected to the main body frame portions 2.Pa and extend rearward in a somewhat diagonal upward direction, supporting the seat S on the upper portion thereof, and serving as seat rails and backstays. 2, a cross member connecting the body frame part 2.2 from the intermediate part 1b to the rear part 1c, and a connecting part 3 which also serves as a mudguard for the rear wheels. It is molded into two parts symmetrically, with the center line Then, the two frames 5 and 6 are welded together at the split surface 4 to assemble the seat frame 1 as one piece.

In addition, each of the left and right frames 5.6 has bolt holes 7.1 aligned with the mounting bosses Fa on the top and bottom of the front end of the main body frame portion 2, and a step bracket B on the lower edge of the middle.
The rear wheel mudguard part 1 is formed by integrally casting the mounting boss 8.8 and the grip part 9, and the mounting part 10 of the tail lamp unit at the rear end, and is recessed upward in the center of the connecting part 3.
1 is integrally cast.

On the other hand, as shown in FIGS. 3 and 4, ribs 2a having an inverted U-shaped cross section are cast on the upper and lower edges of the main frame portion 2 itself, and the connecting portion 3 itself also has a lattice-like structure on its entire surface. The strength of the entire seat frame 1 is maintained by casting the downward ribs 3a.

According to the above configuration, the seat rail, the back stay, the cross member of the seat rail, the mounting bosses of various parts provided on the seat rail and the back stay, the mudguards of the rear wheels, etc. are integrally cast and molded on both the left and right sides. The seat frame 1 can be assembled by simply butting and welding the frames 5 and 6 together.

Next, other embodiments of the present invention will be described based on FIGS. 5 to 8.

In this embodiment, the seat frame 1 is not molded into two parts, the left frame 5 and the right frame 6, as in the above embodiment, but is integrally molded as a whole. It consists of a main body frame part 2.2 consisting of a backstay and a back stay, and a connecting part 3 consisting of a cross member and a rear wheel mudguard. A mudguard part 11 located at the lower part is formed to be recessed upwards of the seat frame 1.

In addition, each main body frame part 2 is provided with mounting bosses 7, 8, 9 and IO similar to those in the above embodiment, and a cord clamper 12 with a U-shaped protrusion is installed on the upper end of the same, and a lightweight cord clamper 12 is installed in the center of the front part. A hollow opening 13 is integrally formed by casting, and a support part 14 of the seat S is formed on the mudguard part 11 in the connecting part 3.
, a tool case 15 with the connection part 3 recessed downward on the extension of the front of the mudguard part 11, a battery case 1B in front of the tool case 15, and a seat frame 1 in front of the battery case 16. A downward baffle plate I7 that crosses the is integrally cast.

On the other hand, as shown in FIGS. 7 and 8, the main body frame portion 2 itself has upward ribs 2a on the sides in addition to ribs 2a on the lower edge.
b is formed by casting to maintain the strength of the entire seat frame 1, and the rib portion 2a is formed in the front half of the main body frame portion 2 to have a U-shaped cross section with an open top. The seat frame 1 is formed into an inverted U-shaped cross section with an open bottom to provide sufficient strength to the front half of the seat frame 1, which requires strength. And the main body frame part 2
A plurality of drain holes 2c for draining water are formed at the lower edge of the front half.

According to the above configuration, the rear seat Sb has the mudguard portion 11
Since the front seat Sa is located in front of the front seat Sa, the front seat Sa can be held relatively low, and the fixation of the vehicle body can be improved.

Further, the baffle plate 17 causes muddy water etc. thrown up by the rear wheels to fall downward, and prevents the muddy water etc. from splashing on the damper and engine located in front of the baffle plate 17.

FIG. 9 shows a modification of the main body frame portion 2. In this modification, marks 18, etc. are integrally cast on the side surface of each main body frame portion 2, and the main body frame portion 20 is configured as an external component. ing.

FIGS. 1O and 11 show another modification of the cross-sectional shape of the seat frame 1. Like this modification, the seat frame 1 has a partially hollow structure in which a sand hole 19 is provided inside using a sand mold. Alternatively, the sand removal hole 19 may be provided on the outside and the entire structure may be formed into a hollow structure composed of a plurality of chambers 20. Further, the chambers 20 may be used as a water tank or the like.

Incidentally, in the above two embodiments, the seat frame 1 including the rear fender R may be completely integrally cast as shown in FIG.

Furthermore, although the above embodiments have been described with respect to aluminum casting, the invention is not limited to this, and it is also possible to mold with other metal materials, resins, and other molding materials.

(Effects of the Invention) As described above, according to the invention of claim 1, the number of parts can be reduced by integrally molding the cross member and mounting bosses of various parts in addition to the seat rail and backstay. At the same time, it is possible to reduce the processing work of each part of the frame as much as possible, reduce assembly man-hours, and reduce costs.
According to the second aspect of the invention, molding can be facilitated and costs can be reduced.

Further, according to the third aspect of the present invention, the fixing property of the vehicle body can be improved, and according to the fourth aspect of the present invention, the front mudguard can be formed at the same time.

[Brief explanation of the drawing]

Fig. 1 is a side view of a seat frame in which the invention of claim 1 is implemented, Fig. 2 is a plan view thereof, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 4 is an IV of Fig. 1. 5 is a side view of the seat frame implementing the invention of claims 2 and 3, FIG. 6 is a plan view thereof, and FIG. 7 is a sectional view taken along the line ■-■ of FIG. Figure 8 is a sectional view taken along the line ■-■ in Figure 5, Figure 9 is a side view of a modified example of the seat frame, Figure 1O and Figure 1.
FIG. 1 is a sectional view of another modification of the seat frame, and FIG. 12 is a side view of a completely integrated seat frame. 1...Seat frame 2...Body frame part 3...Connection part 4...Split surface 5...Left frame (member split in the left-right direction) 6...Right frame (part split in the left-right direction) 8...Mounting boss 11...Mud guard part 17...Baffle plate X...Center line F...Main frame sb...Rear seat

Claims (1)

[Claims] 1. In a seat frame whose front end is connected to the middle upper part of the main frame and extends rearward, a seat rail, a back stay, a cross member of the seat rail, and various parts provided on the seat rail and the back stay. The automatic 2 features a mounting boss and a rear wheel mudguard that are integrally molded.
wheeled wheel seat frame. 2. In a seat frame that connects the front end to the middle upper part of the main frame and extends rearward, the seat rail, the back stay, the cross member of the seat rail, the mounting bosses of various parts provided on the seat rail and the back stay, and the rear wheel. 1. A seat frame for a two-wheeled motor vehicle, characterized in that a mudguard is integrated with the seat frame, a member is formed by splitting it in the left-right direction at a split surface along the vehicle length direction, and the members are joined together. 3. The mudguard according to claim 1 or 2, characterized in that, in the mudguard for the rear wheel, a mudguard portion located below the rear seat and above the rear wheel is recessed upward. Motorcycle seat frame. 4. The seat frame for a two-wheeled motor vehicle according to claim 3, wherein a downward baffle plate extending across the seat frame is integrally formed in front of the mudguard portion.