JPS6042176A - 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, in which the front fork of the front wheel fits into the frame 1, the head pipe 1 into which the front fork of the front wheel is inserted and is supported, and the rear fork 3 of the rear wheel (swing arm). ) is pivotally connected to the pivot shaft 2 which is swingably supported, and how to provide a lightweight frame structure while maintaining rigidity is a key point in frame design.

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 is mainly by welding, resulting in a very high manufacturing cost. In addition, in the case of motorcycles such as road racers and motocrossers that are equipped with a complete set of equipment using such a frame structure as a skeleton, the entire frame is one rigid body, so adjustments such as increasing or decreasing the distance between the front and rear wheels can be made. However, there were limits to how riders could adapt their riding form to suit their own physique and preferences.

The present invention was made in view of the circumstances of the conventional frame structure, and its purpose is to provide the desired rigidity and reduce the weight, and particularly to improve the production of motorcycles such as road racers. To provide a frame structure for a straddle vehicle that satisfies conditions and is low cost.

To achieve the above object, the present invention connects a head pipe and a pivot shaft linearly in a side view by a main frame, and a rear frame assembled to the rear upper surface of the main frame is arranged along the longitudinal axis of the main frame. For example, the 1% mark refers to the fact that the position is variable, such as slide adjustment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The frame structure of a straddle-type vehicle, particularly a motorcycle including a tricycle, which is an embodiment of the present invention will be described in detail with reference to one drawing. In Fig. 2, numeral 4 in Fig. 1 indicates a main frame, and numeral 5 indicates a rear frame. The main frame 4 has a frame body integrally formed by a pair of substantially symmetrical panels 4α and 4a, and is designed so that the frame body is formed in a substantially straight line when viewed from the side in the direction of arrow A, that is, the front fork The line connecting the head vibro (not shown) into which the head vibro is fitted and the pivot shaft 7 that swingably supports the rear fork 8 is substantially straight.

What this means is that the usual method of dealing with external forces that act on the car body from all angles is to use a case frame structure made of square steel pipes, etc., 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 this embodiment, the main frame 4 does not have a structural design that can withstand external forces acting from all angles.

The structure of each panel 4a of the main frame 4 is not only a thin steel plate or aluminum, but also a plate 4α which is press-formed as an outer panel using a synthetic resin material such as FRP or CFRP, as shown in Fig. 3. The plate 4α2 forms a tube with a rectangular cross section, and the space inside the tube is formed as a structure filled with honeycomb cores 9 which are separated into a number of mutually 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 external forces that act especially from the direction of the arrow hole, and the entire panel is made lighter and has the necessary cross-sectional performance. will have the following. That is, by filling the honeycomb cob 9 consisting of independent chambers so that the partition holes 9α thereof are approximately perpendicular to the inner walls of each of the plates 4α1 and 4α2, the honeycomb member exhibits a unique load-bearing strength. Aiming for effect.

In this case, it is assumed that the plate 4α1 and the grate 4α2 are caulked together using pot rivets 10. Further, the head vibro 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, on the rear upper surface of the main frame 4, there is a tail frame-like structure frame 5 on both sides of the panel 4a r 4α.
It can be assembled by straddling the The rear frame 5 serves as a frame on which seats and the like are assembled, and is an integral frame body made up of a pair of approximately symmetrical press-molded panels 5α and 5α, including a dark honeycomb core 9. . Also, panel 5c + 5α has a hem widening of υ,
Each lower leg seat has a binding seat 5 bent outward as shown in the figure.
b, 5b are provided. However, what is this catch seat 5b1?
5b comes into contact with the rear upper surface of the main frame 4 having the flat surface 4b.

As shown in FIG. 4, a large number of mounting holes 4C such as oblong holes, through holes, or screw holes are drilled with a certain pinch in the rear upper surface of the main frame 4 side panel 4α, and one of the rear frame 5 side panels A mounting hole 5C corresponding to the mounting hole 4c is similarly bored in the 4V seat 5b of 5α. Therefore, both mounting holes 4c.

By shifting the positions of the rear frames 5c from each other, the relative position of the rear frame 5 with respect to the main frame 4 can be varied. In the figure, 11 is shown as a rivet, but bolts, rivets, sprads, etc. are selected each time to correspond to the mounting holes 4c and 5c. For example, the mounting hole 4c.

If at least one of the holes 5C is made into a long hole, it will be selected as the bolt/nut set 11.

Therefore, as is clear from the above description, the frame structure of the present invention is particularly suitable for use as a frame structure for motorcycles, and the position adjustment of the rear frame 9 relative to the main frame can be carried out by the factory side or by the user. This will be done freely on the side. In addition, the rigidity of the frame, mainly consisting of the main frame and carrier frame, is expected to be significantly improved compared to the conventional pipe frame structure, and since the overall structure is compact and slim, the weight can be significantly reduced. Of course, the reduction in design and manufacturing man-hours has the effect of increasing the degree of freedom in design.

[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 to adjust the positions of the main frame and the rear frame. Explanation of symbols of main parts 4...Main frame 4α...Panel 4α1+4
(L2...Outer plate 4b...Flat surface 4G...Additional hole
5...Rear frame 5a...Panel 5b...4B Seat 5G...Mounting hole 6...-＼Pipe 7...Pivot bearing 9...Honeycomb core 10...Pot rivet 11... ... Rivet or bolt applicant Motohiko Fujimura, agent of Honda Motor Co., Ltd., patent attorney

Claims (1)

[Claims] A straddle including a main frame that linearly connects a head pipe that rotatably supports a front fork and a bibont bearing that swingably supports a fork in a side view, and a rear frame that is joined at the rear upper surface of the main frame. 1. A frame structure for a straddle-type vehicle, wherein the rear frame is provided so as to be freely adjustable in position along the longitudinal direction of the main frame.