JPS6042174A - 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 must not only be strong but also have a certain degree of flexibility, as well as be lightweight and thin. is one of the typical ones, and includes a head knob 1 on which the front fork of the front wheel is fitted and supported, and a pivot shaft 2 on which the rear fork 3 (swing arm) of the rear wheel is swingably supported. A key point in frame design is how to connect the two with the same rigidity and provide a lightweight frame structure.

On the contrary, 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 is mainly by sliding the joining surfaces of the members together, using gusset plates, etc. Because welding is used through reinforcing plates, manufacturing costs are bound to rise significantly.

The present invention was made in view of the circumstances of 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. By doing so, we hope 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 head pipe and a pivot shaft are connected substantially linearly by a main frame that is a single member.

The present invention provides a main frame with rigidity and strength that can withstand external forces from all directions and angles on the line of action of the force connecting the head pipe and the pivot shaft, that is, moments due to twisting, bending, and tension and compression. It is characterized by being moldable.

Furthermore, the main frame of the present invention is constructed using a press-formed structure in which a honeycomb core is surrounded by an outer plate such as a thin steel plate. It is characterized by a slim main frame.

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 designed so that the side view from the direction of arrow A is substantially straight, that is, the front fork (not shown) The line connecting the head vibro into which the head vibrator (1) is fitted and the pivot shaft 7 which swingably supports the rear four 8 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. The most efficient direction for consolidating each member into a single member is to configure the members on the 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 structure that can withstand external forces acting from all angles.

The structure of each channel 4α of the main frame 4 is made of a plate 4α1 and a plate 4α2 that are press-formed as outer plates using synthetic resin materials such as FRP and CFRP as well as thin steel plates or aluminum, as shown in Fig. 3. As a result, the tube has a rectangular cross section, and the space inside the tube is formed as a structure filled with a no-nicum core 9 which is separated into a number of mutually independent chambers. Specifically, by filling the no-nikum core 9 as shown in the figure and using it as a reinforcing member,
In particular, it can cope with external forces acting from the direction of the arrow A, and the entire Noyonel is quantized and has the necessary cross-sectional performance. That is, by filling each independent chamber so that the partition holes 9α of the nicum core 9 are approximately perpendicular to the inner walls of each of the plates 4α1 and 4α2, the nicum core 9 is filled with The aim is to have the effect of exhibiting a unique yield strength.

In this case, it is assumed that the plate 4cL1 and the plate 4α2 are caulked and joined together by a bonobori bevel 10. Further, the head knob 6 described above is detachably attached to the main frame 4, and the slider frame 5 is attached to the panels 4α on both sides, so that the caster angle of the front wheels can be set variable.

It can be assembled by straddling 4α. This rear frame 5 is also a set of substantially symmetrical panels 5 made by press molding.
It is constructed as a frame body consisting of α and 5a, and the hem portions of these two panels are also connected and fixed to a cross member 12 that serves as a horizontal connection reinforcement for the main frame 4. The bottom portion is caulked or bolted to the upper surface of each panel 4-a of the main frame 4 using pot rivets 11. Furthermore, although each panel 5α has a slightly thinner structure than the panel 4α of the main frame 4, the inside of each panel 9 is filled with a honeycomb core.

It should be noted that the main frame 4 and the rear frame 5 may have a frame structure with a completely unified box cross-section, as long as various conditions are satisfied, instead of having a frame type with a set of panels on both sides.

Therefore, as is clear from the above description, the present invention exhibits remarkable effects particularly when applied to motorcycles. In other words, by creating a slim frame structure in which the number of frame members and related components are reduced to the utmost, the number of man-hours required for design and production is significantly lower than that of conventional double cradle frames. Improvements can be expected. Moreover, by configuring the main frame linearly when viewed from the side of the vehicle, a rational and functional frame structure capable of absorbing member stress caused by external forces acting from all directions can be realized. The effect of satisfying rigidity and weight reduction at the same time can be obtained.

[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 of the present invention, and FIG. 3 is a partial perspective sectional view showing the panel structure of the main frame. Explanation of the symbols of the main concubine parts 4... Main frame 5... Rear frame 4α,
5α... Panel 4α1, 4α2... Outer plate 6... Head vibe 7... Pivot bearing 9... Honeycomb...
Core 10.11...Bopp Revent 12...Reinforcement cross member Applicant Honda Motor Co., Ltd. Agent Patent attorney Motohiko Fujimura

Claims (1)

[Claims] A frame structure for a straddle type vehicle including a main frame connecting a head pipe that rotatably supports a front fork and a pivot bearing that swingably supports a fork, the main frame being formed by an outer plate. A honeycomb member having a large number of independent partition chambers is filled inside a tube body formed into a rectangular cross section, and the central axis direction of the partition chambers of the honeycomb member with respect to the long side in the cross section of the tube body is filled. 1. A frame structure for a straddle-type vehicle, characterized in that the frame structure is linear in side view by a structure formed at a substantially right angle.