JPS6042177A - 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 Fig. 1 is one of the typical ones, and the front fork of the front wheel fits into and is supported by the henotono91fu01, and the rear fork 3 (swing arm) of the rear wheel. A key point in frame design is how to connect the pivot shaft 2, which is swingably supported, with sufficient rigidity and 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 the assembly method involves sequentially sliding the pipes together at the joints. However, since the main work is to weld side panels together with reinforcing gusset plates and other skirt plates, manufacturing and assembly costs are destined to skyrocket.

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.

To achieve the above object, the present invention particularly provides a main frame that linearly connects a head pipe and a pivot shaft, the main frame being formed into a structure having a rectangular cross section and surrounding a honeycomb reinforcing member with an outer plate. The frame is further characterized in that a lip-shaped or band-shaped reinforcing member is joined to the longer side of the frame over the entire length of the frame or intermittently.

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 flanges 4a, 4a, and is arranged so that the front fork ( The line connecting the head/guin 6 into which the head (not shown) is fitted and the one-bit shaft 7 which swingably supports the rear fork 8 is substantially straight.

What these mean is that while the usual method of dealing with external forces acting 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. The most efficient direction for consolidating each member into a single member is to configure the members on the line connecting the head no. e f6 and the pivot I/shaft 7, which are diagonal directions in this case. become. therefore,
In the case of the embodiment, the main frame 4 has a structural design capable of withstanding external forces acting from all angles.

The construction of each part of the main frame 4 and the flanges 4α are made of not only thin steel plates or aluminum, but also synthetic resin materials such as FRP and CFRP, as shown in Fig. 3, which are molded as outer plates. 4α1 and gray) 4 (L2 makes it a tube with a rectangular cross section, and the space inside this tube is separated into a number of mutually independent chambers) - Molded as a structure filled with Nicum and Core 9. . Specifically, honeycomb
By filling the core 9 as shown in the figure and using it as a reinforcing member, it is possible to cope with external forces acting particularly from the direction of the arrow A,
- The entire tunnel is lighter and has the necessary cross-sectional performance. That is, by filling the honeycomb core 9 consisting of independent chambers so that the partition holes 9a are approximately perpendicular to the inner walls of the plates 4α1 and 4α2, the rigidity unique to the honeycomb member is achieved. Aiming for the effect of demonstrating strength.

In this case, it is assumed that the plate 4a and the plate 4α2 are caulked together using Ponoff 0 rivets 10.

Panel 4aK of main frame 4 configured as above
As shown in FIGS. 2 to 4, for example, a rib reinforcement member 11 having a rectangular cross section (see FIG. 4 (α)) or a fin-shaped reinforcement is provided over the entire length of the side surface of the flannel 4a or intermittently. The members 11 (see FIG. 4(A)) and the like are joined by welding, rivets, or the like. However, these reinforcing members 11 may be press-molded integrally with the panel 4α.

In addition, as shown in FIG. 2, the reinforcing member 11 is
It is even more secure if it is provided on both sides, regardless of whether it is on the outside or inside of the side surface of a. Note that the rear frame 5 side is no exception. In the figure, reference numeral 12 denotes a reinforcing cross member that aligns the main frame 4 and the rear frame 5.

Therefore, as is clear from the above description, the frame structure for a straddle type vehicle according to the present invention has the following features.

(α) In the case of a conventional frame such as a double cradle type, there are almost no reinforcing hem plates such as Sesotofu 0lets and patches installed at the junction of the Guino and 74 Eve in this structure. .

(A) Since the entire frame structure is substantially planar and linear, the reinforcing member can be assembled and fitted into the frame body quickly and accurately.

(c) Since the structure is such that the stress distribution acting on the members is spread over a wide range without being concentrated, the stress sharing among each member is reduced, and the degree of freedom in design corresponding to this is increased.

(The conflicting problems of weight reduction and rigidity increase can be rationally solved at the same time.

[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 (α) to (L2) are cross-sectional views showing various forms of the reinforcing member. Explanation of symbols of main parts 4...Main frame 5...Rear frame 4α・
・Panel 4aj1”2...Outer panel 6...Hesodonogu Eve 7・
... Pivot bearing 9 ... Honeycomb core 10 ... Trib-shaped or band-shaped reinforcing member 12 ... Cross member Applicant Honda Motor Co., Ltd. Agent Patent attorney Motohiko Fujimura Figure 1

Claims (1)

[Claims] The head/guve, which rotatably supports the front fork, and the pivot bearing, which rotatably supports the chaff makeup, are connected linearly in side view, and the outer plate surrounds the honeycomb member. What is claimed is: 1. A frame structure for a straddle type vehicle including a main frame, characterized in that a reinforcing member is joined to the side surface of the main frame along its longitudinal direction.