JPS6042175A - Frame structure for saddling type car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frame structure for a straddle type vehicle including a motorcycle, a tricycle, and the like.

For example, the frame that forms the skeleton of a motorcycle is required not only to be strong but also to have a certain degree of flexibility, as well as being lightweight and thin.

The so-called double cradle type frame shown in Figure 1 is one of the typical ones.The front fork of the front wheel is fitted into the head gear 1, which is supported by the shaft, and the rear fork 3 of the rear wheel (swing arm). ) is a key point in frame design, how to rigidly connect the pivot I and shaft 2, which are swingably supported, and how to provide a lightweight frame structure.

However, in the case of the double cradle type frame shown in Fig. 1, the casing is formed from square steel pipes or round steel pipes as shown in the figure, and welding is mainly used as the assembly method, resulting in a very high manufacturing cost. We have a destiny.

The present invention was made in view of the circumstances surrounding the conventional frame structure, and its purpose is to provide a frame structure that has the desired rigidity, is lightweight, and ultimately significantly reduces the number of manufacturing steps. The objective is to provide a frame structure for a straddle type vehicle that is close to the ideal.

In order to achieve the above object, the present invention is characterized by a frame structure in which a henode pipe and a pivot shaft are connected substantially linearly by a main frame that is a single member.

The present invention provides a main body having rigidity and strength capable of responding to external forces from all directions and angles on the line of action of the force connecting the hesodopire and the pi-nodal axis, that is, moments due to twisting, bending, and tension and compression. The feature is that the frame is molded.

Furthermore, the present invention provides that the rear frame joined to the main frame at the rear upper surface thereof is constructed using a press-formed panel structure in which a Nikum core is surrounded by an outer plate such as a thin steel plate. In addition to providing the necessary rigidity, it is also characterized by a lightweight and slim frame structure.

Further, in the present invention, in the relationship between the main frame and the rear frame which is joined at the rear upper surface thereof, the legs of the rear frame are formed into a . By assembling the main frame so that it straddles the main frame, which is integrally framed by a set of panels, the stress distribution acting on both is rationalized, increasing rigidity and stabilizing the fit.

Furthermore, the present invention is characterized in that the contact surfaces of the main frame and the pre-fertilizer frame are flat and have sufficient length and area.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a frame structure of a straddle-type vehicle, particularly a motorcycle including a tricycle, according to an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 2, 4 indicates a main frame, and 5 indicates a rear frame. The main frame 4 has a frame body integrally formed with a pair of substantially symmetrical panels 4a, 4a, and is arranged so that the front fork (not shown) is substantially straight when viewed from the side in the direction of the arrow. The head vibro and the rear fork 8 are fitted into each other to support the head vibro and the rear fork 8 in a freely swinging manner. The line connecting the gutter axis 7 is formed to be substantially straight.

What this means is that while the usual method of dealing with external forces that act on the car body from all angles has been to use a housing frame structure made of square steel pipes as shown in Figure 1, The idea is to reduce the number of members on each side of the skeleton that share the role as much as possible and make it into a single member. In this case, the most efficient direction for consolidating each member into a single member is the diagonal direction, in which case it is sufficient to construct the members on the line connecting the head (eve 6 and pivot shaft 7). Therefore, in the case of the embodiment, the main frame 4 has a structural design that allows it to withstand external forces acting from all angles.

The structure of each gunnel 4a of the main frame 4 is made of synthetic resin materials such as F, R, P, CJ', R, P, etc., as well as thin steel plates or aluminum, as shown in Fig. 3. The plate 4a1 and the plate 4CL2, which are press-molded, form a tube with a rectangular cross section, and its upper surface is flat. The space inside this tube is separated into many independent chambers...
It is molded as a structure filled with nicum core 9. Specifically, by filling the nicum core 9 as shown in the figure and using it as a reinforcing member, it is possible to cope with the external force acting especially from the direction of the arrow, and the overall weight of the flannel is reduced. Moreover, it has the necessary cross-sectional performance. That is, by filling the partition holes 9a of the honeycomb core 9 consisting of independent chambers so as to be substantially perpendicular to the inner wall VC of each of the grays 1-4a, 4α2, the honeycomb member can be formed. The aim is to have the effect of exhibiting a unique yield strength.

In this case, it is assumed that the grate 4a1 and the play 1-40L2 are caulked together using boss rivets 10. Further, the head i9 iso6 described above is detachably attached to the main frame 4, and is designed to make the setting of the caster angle of the front wheels variable.

Next, a rear frame 5 having the shape of a tail wing is assembled to the rear upper surface of the main frame 4 so as to straddle the two nine-channels 4a, 4a on both sides. The rear frame has a large frame for assembling the 5-piece seat, etc. As shown in Fig. 4, it is similar to the main frame 4 mentioned above.
It is framed by a pair of substantially symmetrical joints 5α, 5α formed by press molding and including a core 9. Furthermore, the panels 5α, 5α have a V-shape in which the bottoms of the panels widen toward each other, and each lower leg seat surface is bent outward as shown in the figure, and is flat and has a sufficient length L. 5b. However, the flange seats 5b, 5b are caulked and joined to the Ponof 0 rivet 11 on the rear upper surface of the main frame 4 having the flat surface 4b, and the main frame 4 and the rear frame 5 are assembled. In addition, 12 in the figure
is a cross member that aligns the main frame 4 and rear frame 5 and serves as a reinforcing material for the entire structure.

As is clear from the above explanation, according to the frame structure of the present invention, the joint area between the main frame and the rear frame is very wide, and the member stress concentrated at the joint is dispersed, resulting in increased rigidity of the entire frame. Anog can be planned. Therefore, there are almost no attachments such as conventional types such as guide plates and gunochi. Best of all, since the structure is press-formed from a flat plate such as a thin-walled steel plate by utilizing honeycomb members, it is not only possible to realize a significant weight reduction, but also to reduce design and manufacturing precision and man-hours. Become.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a double cradle type frame structure, FIG. 2 is a perspective view showing an embodiment structure of the present invention, and FIG. 3 is a partial perspective sectional view showing the panel structure of the main frame.
FIG. 4 is a partial perspective view showing how the rear upper surface of the main frame is assembled with the rear frame. Explanation of symbols of main parts 4--Main frame 4a...Panel 4a, 4. a
2... Outer plate 4b... Flat surface 5... Rear frame
5α...Riyanel 5b...Flame catch seat 6...Henotonoya Eve 7...Hikinoto bearing 9...Honeycomb core io
, u...Pono Prive Soto 12...For cross members Applicant Motohiko Fujimura, Patent Attorney, Honda Motor Co., Ltd.

Claims (1)

[Claims] The head gear, which rotatably supports the front fork, and the throat bearing, which rotatably supports the rear fork, are connected to the main frame, which linearly connects the main frame when viewed from the side, at the upper rear surface of the main frame. A frame structure for a straddle type vehicle including a rear frame, wherein the contact surfaces of the main frame and the rear frame are both formed flat and have a sufficient area. Frame structure for seated vehicles.