JPH09226658A - Frame pipe connecting part structure for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting part structure for a frame pipe which can prevent decreasing of a quality due to drilling work while a drain hole can be formed even without applying its drilling work in a frame so as to enable a cost of drilling work to reduce. SOLUTION: In a motorcycle, a bracket 28 is welded to a front and part 26a of a seat rail 26 formed with a frame, in a connecting part of the bracket 28 and the seat rail 26, a fit insertion part 28a integrally protrusively provided from the bracket 28 is provided, this fit insertion part 28a is insertion fitted to the end part 26a of the seat rail 26, also a recessed groove 32 connecting the inside/outside of a seat rail frame 30 is formed in the fit insertion part 28a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a frame member, such as a seat rail, having a bracket welded to one end of a pipe of a motorcycle.

[0002]

2. Description of the Related Art In a motorcycle, a pivoting portion which descends downward is fixed to the rear portion of a main frame (tank rail) extending rearward from a head pipe by welding, and an upper portion of the pivot portion is rearwardly attached. A seat rail that supports the seat of the occupant, which extends toward the bottom, is fixed by being supported by bolts.

FIG. 5 is an explanatory view showing a state in which a seat rail a is connected to a pivot portion b of a main frame in a frame of a conventional motorcycle, and FIG. 6 shows a bracket d fixed to a tip portion of the seat rail a. It is a state explanatory view. As shown in FIG. 5, the seat rail a is made of a pipe material having a hollow a2, and the seat rail a is attached to the main frame pivot portion b by a bracket (joint portion) d.
Is fastened to the upper end portion b1 of the bolt with a bolt c.

In this case, as shown in FIG. 6, the bracket d has a slightly tapered insertion portion d at one end (rear end in the figure).
1 and the fitting insertion portion d1 is inserted into the hollow end portion a1 of the seat rail a to be fitted therein, and a bolt hole d2 for the bolt c is formed at the other end. As shown in FIG. 6, with the bracket d fitted and inserted in the seat rail end portion a1, the seat rail end portion a1 is fixed by welding e over the entire circumference of the bracket d. The seat rail a is fastened and fixed to the upper end portion b1 of the main frame pivot portion b by screwing the bolt c into the bolt hole d2 of the welded and fixed bracket d.

The bracket d is formed in an appropriate shape by extrusion molding or the like. After the bracket d is welded to the seat rail end portion a1, the seat rail a is subjected to surface treatment such as alumite treatment or coating. Due to the relationship, water or the like may enter the hollow a2 inside the seat rail a, so conventionally, the water drainage hole f was formed in the lower surface portion near the end portion of the seat rail a.

[0006]

However, there is a problem that the drainage hole f becomes a work load because it needs to be opened by machining in a post process after welding. In addition, there is a problem in that the quality may become unstable due to cracks in the periphery of the frame, such as a seat rail, which is perforated. Further, not only the seat rail but also the bracket is welded and fixed to a frame pipe for a motorcycle, and the same problem as described above occurs at a connecting portion requiring a drain hole.

The present invention has been made in order to solve the above-mentioned conventional problems, and the drainage hole can be formed in the frame without performing the drainage hole, so that the processing cost can be reduced. An object of the present invention is to provide a structure for connecting a frame pipe for a motorcycle, which can be reduced and can prevent deterioration in quality due to drilling.

[0008]

In order to solve the above problems, a frame pipe connecting structure for a motorcycle according to the present invention is provided.
In a motorcycle in which a frame member, in which a bracket is welded to one end of a pipe, is connected to another frame member by this bracket, a connecting portion between the bracket and the pipe is provided with a fitting inserting portion integrally protruding from the bracket. Is inserted into the pipe, and a concave groove that communicates the inside and the outside of the frame member is formed in the fitting insertion portion.

According to the present invention, the connecting portion between the bracket and the pipe is provided with a fitting insertion portion integrally protruding from the bracket, and the fitting insertion portion is fitted into the pipe, and the fitting insertion portion is also inserted. Since the concave groove for communicating the inside and the outside of the frame member is formed in the frame member, the drain groove for communicating the inside and outside of the frame can be formed by the concave groove only by welding and fixing the bracket to the pipe. Therefore, it is not necessary to drill the drain hole after the bracket welding, the processing cost can be reduced, and the deterioration of the quality due to the drilling can be prevented.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 are a side view and a plan view mainly illustrating a frame of a motorcycle according to an embodiment.

As shown in the figure, the motorcycle has a front wheel 10
A front fork 12 that supports a head tube 14 is rotatably supported by a head pipe 14. From the head pipe 14, a hollow main tube (main frame) 16 that also serves as a tank rail extends symmetrically downward while extending backward. It constitutes the frame. A pivot portion 18 is welded and fixed to a rear end portion of the main tube 16, and a rear swing arm 20 is pivotally supported by a pivot shaft 22 on the pivot portion 18, and the rear swing arm 20 is a cushion unit. Buffered at 24.

Also, the upper end portion 18a of the pivot portion 18 is
A seat rail 26 that supports a seat on which an occupant sits from below is fastened with bolts 18b in a state where the seat rail 26 extends obliquely upward and rearward. The seat rail 26 is made of a pipe material and constitutes a seat rail frame 30 formed by welding a bracket 28 to the front end portion 26a of the seat rail 26.

FIG. 3 is an explanatory view of the seat rail front end portion 26a. As shown in FIG. 3, the seat rail 26
Has a substantially rectangular cross section, and the bracket 2
The connecting portion between the seat rail 26 and the seat rail 26 is integrally projectingly provided at one end of the bracket 28, and a fitting insertion portion 28a having a cross-sectional shape corresponding to the cross-sectional shape of the hollow 26b of the seat rail 26 is provided. 28a is inserted into the front end portion 26a of the seat rail 26 made of a pipe material. A recessed groove 32 that communicates the inside and outside of the seat rail frame 30 is formed in the fitting insertion portion 28a.

That is, as shown in FIG. 3, when the bracket 28 is extrusion-molded, the recessed groove 32 is continuously formed in one end in the extrusion direction and is formed in a direction perpendicular to the direction in which the bolt hole 28b is opened. Then, the brackets 28 are formed by cutting them individually and opening a bolt hole 28b at the other end. In this bracket 28, the fitting insertion portion 28a is inserted into the front end portion 26a of the seat pipe 26 along the direction of the recessed groove 32 in the longitudinal direction of the seat rail 26 (the vertical direction in FIG. 3A) ( Then, in that state, the bracket fitting insertion portion 28a and the seat rail 26 front end portion 26a are welded (welded portion 34) and fixed so as not to close the concave groove 32.

Then, as can be seen from FIG. 3, the recessed groove 32 forms a hole extending in the vertical direction so that the inner hollow portion 26b of the seat rail frame 30 communicates with the outside. Therefore, by simply fixing the bracket 28 to the seat rail 26 of the pipe material by welding, a water drain hole communicating between the inside and outside of the seat rail frame 30 can be formed by the groove 32. Therefore, it is not necessary to drill the drain hole after the bracket 28 is welded, the processing cost can be reduced, and the deterioration of the quality due to the drilling can be prevented.

Although the bracket 28 is formed by extrusion molding, it is clear that the bracket of the present invention is not limited to this and may be formed by forging or casting. Figure 4 shows bracket 3 formed by forging or casting
6 is an example. The same parts as those in FIGS. 1 to 3 are designated by the same reference numerals.

The bracket 36 shown in FIG. 4 has a notch 36b at the rear end portion of the lower end portion of the fitting insertion portion 36a at an appropriate position (any shape position may be used as long as the notch is open rearward including the lower end portion). Is forming. When the bracket 36 is fitted into the seat rail 26 and fixed by welding to form the seat rail frame 38, the hollow 26b space inside the seat rail frame 38 is communicated with the outside through the notch 36b. Therefore, the notch 36b
Is a drainage hole, and the drainage hole can be formed without drilling the seat rail 26.

[0018]

As described above, according to the present invention,
By simply fixing the bracket to the pipe by welding, the recessed groove can form a drainage hole that communicates the inside and outside of the frame. Therefore, it is not necessary to drill the drain hole after the bracket welding, the processing cost can be reduced, and the deterioration of the quality due to the drilling can be prevented.

[Brief description of drawings]

FIG. 1 is a side view showing a frame of a motorcycle according to an embodiment.

FIG. 2 is a plan view showing a frame of the motorcycle according to the embodiment.

3A and 3B are diagrams illustrating the details of an extrusion-molded connecting portion, in which FIG. 3A is a side view and FIG. 3B is a plan view.

FIG. 4 is a side view illustrating a bracket formed by forging or casting.

FIG. 5 is an explanatory view of a connected state of a conventional seat rail.

FIG. 6 is an explanatory view of a main part of a seat rail, (a) is a side view and (b) is a plan view.

[Explanation of symbols]

 16 Main Tube 18 Pivot Part 18a Pivot Part Upper End 26 Seat Rail 26a Seat Rail Front End 28 Bracket 28a Bracket Fitting Part 28b Bolt Hole 30 Seat Rail Frame 32 Recessed Groove 36 Bracket 36a Bracket Fitting Part 36b Notch 36c Bolt Hole

Claims (1)

[Claims] 1. A motorcycle in which a frame member in which a bracket is welded to one end of a pipe is connected to another frame member by the bracket, and a connecting portion between the bracket and the pipe is provided with a fitting insertion portion integrally protruding from the bracket. A frame pipe connecting portion structure for a motorcycle, wherein the fitting insertion portion is fitted into a pipe, and a concave groove is formed in the fitting insertion portion to communicate the inside and outside of the frame member.