JPS6042182A - Frame structure for 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 frame structures for vehicles including motorcycles, tricycles, and the like.

For example, the frame that forms the skeleton of a motorcycle is not only sturdy but also has a certain degree of flexibility.

Moreover, requirements such as being lightweight and thin are desired.

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

However, in the case of the double cradle type frame shown in Figure 5, the casing is formed from square steel tubes or round steel tubes as shown in the figure, and the assembly method is mainly welding, so the manufacturing cost is inevitably high. They are indebted to the government.

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. Our goal is to provide a frame structure for vehicles that is close to the ideal.

In order to achieve the above object, the present invention provides a vehicle body frame such as a main frame connecting a head pipe and a pivot shaft, which is formed using a tubular structure having a rectangular cross section, for example, filled with a honeycomb core. It is characterized by

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, frame structures of vehicles, particularly motorcycles including tricycles, which are embodiments 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 4α+4a, and is designed so that the side view from the direction of arrow A is substantially straight, that is, the front fork (not shown) ) is formed so that the line connecting the hend pipe 6 into which the rear fork 8 is fitted and the pivot shaft 7 that swingably supports the rear fork 8 is 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. The most efficient direction for consolidating each member into a single member is to construct the members on a line connecting the head vibro and the pivot shaft 7, which is the diagonal direction in this case. Therefore, in the case of the embodiment, the main frame 4 has a structural design that can withstand external forces acting from all angles.

The structure of each panel 4α of the main frame 4 is a plate 4α1 and a plate 4α2 that are press-formed as outer panels using thin steel plates, aluminum, etc., as well as synthetic resins such as FRP and CFRP, as shown in FIG. 3, and have a rectangular cross section. The inner space of the tube is filled with honeycomb cores 9 which are separated into a number of independent chambers.

Specifically, by filling the honeycomb core 9 as shown in the figure and using it as a reinforcing member, it is possible to cope with the external force acting particularly from the direction of the arrow A, and the entire panel is lightened and the necessary cross section is reduced. There are many things that have good performance. That is, by filling the honeycomb core 9 consisting of independent chambers so that the partition holes 9cL are approximately perpendicular to the inner walls of each of the plates 4α1 and 4α2, the unique load-bearing strength of the honeycomb member can be achieved. We aim to achieve the desired effect. In this case, it is assumed that the plate 4α1 and the plate 4α2 are caulked together using a pot rivet 10.

The relationship between the panel 4 and the honeycomb core 9 will now be explained in detail.The panel structure shown in FIG. 3(a) has a rectangular cross section with different aspect ratios. If we consider it as a beam structure, the width bnym and height Jb% are b
If the relationship is <h, arrow A shown in Figure 1
There is concern about the rigidity and strength of the member in terms of section modulus and the like against external forces acting from any direction. Therefore, the honeycomb core 9 is filled at right angles to the long sides of the plates 4α1 and 4α2. However, this method takes advantage of the fact that the honeycomb member has excellent rigidity against external forces along the longitudinal direction of the holes 9α, which are separated as independent chambers. In this case, the shorter the length b' of the spaced holes 9a, the more remarkable the effect.

In addition, as shown in Fig. 3(b), another example of a panel structure that has not been implemented is that, depending on the model, when the panel 4α of the main frame 4 and, for example, the engine cover E or the fuel tank are in close contact with each other, By forming the panel 4α into a U-shape, the same effect can be obtained even if the opening side thereof is joined to the side wall of the engine cover E or the like when assembled.

As is clear from the above description, the frame structure for a vehicle according to the present invention is suitable not only for use as a frame for a motorcycle, but also for various vehicle chassis such as agricultural machines. Both the weight reduction and design and manufacturing man-hours are far superior to those of conventional frames, and the use of honeycomb members more than compensates for the weight reduction in terms of rigidity and strength. In addition, the use of honeycomb members not only reduces weight and serves as a reinforcing member, but also has the effect of reducing the effect of heat emitted from the engine on the occupants due to its insulation effect.

[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 example structure of the present invention, and Figs. 3 (α) and (b) are parts showing the panel structure of the main frame. It is a perspective sectional view and a sectional view showing the structure of another example. Explanation of symbols for main parts 4... Main frame 5... Rear frame 4α...
・Panel 4α1, 4α2... Outer plate 6... Head pipe 7... Pivot bearing 9... Honeycomb core 1
0...Poffligend E...Equipment side applicant for engine cover or fuel tank, etc. Honda Motor Co., Ltd. agent Patent attorney Motohiko Fujimura

Claims (1)

[Claims] The interior of the tubular body formed into a rectangular cross section by an outer plate is filled with a honeycomb member that is separated into a number of independent chambers, and the partitioned chambers of the honeycomb member are separated from each other with respect to the long side in the cross section of the tubular body. A frame structure for a vehicle, characterized in that it is constituted by a structure whose central axis direction is substantially perpendicular.