JPS601024Y2 - Motorcycle step rotation shaft wear prevention structure - Google Patents

Description

[Detailed explanation of the invention] This invention is an automatic 2 that rotates and retreats when it touches the ground.
This invention relates to a structure for preventing wear of the step rotation shaft of a rotary folding step of a wheeled vehicle, and aims to reliably prevent wear of the step rotation shaft with a simple structure.

In general, when the left side rotary folding step is viewed from the rear, it looks like the one shown in Figure 1. On the main body of the folding step 1, there is a concave-shaped bracket 3 at the end on the vehicle body 2 side when viewed from the vehicle body 2 side.
On the other hand, a U-shaped bracket 4 that opens toward the vehicle body 2 is welded to the vehicle body, and a U-shaped bracket 4 that opens toward the main body of the step 1 is welded to the narrow vertical surface 5 of the U-shaped bracket 4. The bracket 6 is fixed by welding to the entire circumference 7 of the joint with the surface 5, and the step rotation shaft 8 is passed through the shaft hole (not shown) formed in the brackets 3 and 6 to fold it. The step 1 is rotatably supported on the vehicle body side bracket 6, and the folding step 1 is normally biased in the direction of arrow A by a torsion coil spring (not shown) attached to the shaft 8, so that the folding step 1 assumes the protruding position shown in FIG. It is designed to be held elastically, and the basic structure is shown in Japanese Utility Model Publication No. 51-27547.

A substantially perpendicular plane perpendicular to axis 8 in Fig. 1 (II-n cross section)
In FIG. 2 showing the bottom plate 3a of the concave bracket 3,
is in contact with the lower end of the step side inner surface 6a of the U-shaped bracket 6, and the portion where the vehicle body side end surface 3b of the bottom plate 3a and the inner surface 6a of the bracket 6 are in contact forms a part S of the stopper.

Conventionally, when the load Fl acting on step 1 is applied to landing from a jump, the large load F2 (Fl<F
2), the positions of the contact point P1 between the shaft hole 10 of the bracket 3 and the shaft 8 and the contact point P2 of the shaft hole 11 of the bracket 6 will change from points Pl and F2 in FIG. 2 to points P1 and F2 in FIG. 3 due to the shaft hole tolerance. P
1' and P2' points, and there are two shaft conforming surfaces 1, which causes the problem of rapid wear.

In other words, since there are two so-called shaft fitting surfaces where the fitting action progresses due to the abutment between the shaft 8 and the shaft holes 10, 11, the cross-sectional area of the shaft 8 decreases and the cross-sectional area of the shaft holes 10, 11 increases noticeably. Prone.

At the same time, due to the wedge action in the stopper part S, the pressure contact portions between the shaft 8 and the shaft holes 10, 11 (pressure contact points P1', P2', etc.)
The surface pressure on this surface has increased, and the amount of wear has also increased from this surface.

This means that the bottom plate 3a of the bracket 3 is connected to the inner surface 6 of the bracket 6.
This is because the stopper part S acts as a stopper only against the load that pushes a in the X direction in FIG. 3, and does not act as a stopper in the vertically upward y-axis direction perpendicular to the X-axis.

By providing the stopper part S of the present invention on both the X and y axes, the wedge effect shown in FIG. 3 can be eliminated, and the Pl
, 12 points of movement are eliminated, and the shaft fitting is made into one point. An example is shown in FIG. 4.

In FIG. 4, the step-side inner surface 6a of the U-shaped bracket 6 on the vehicle body side has one protrusion 1 in the center near its lower edge.
2 are integrally provided, and the bottom plate 3a of the step side bracket 3 not only has the vehicle body side end surface 3b abutting the bracket inner surface 6a, but also the upper surface 3c of the bottom plate 3a abuts the lower surface of the convex part 12, and the bracket 6 The inner surface 6a and the lower surface of the convex portion 12 form part of a stopper for both the X-axis and the y-axis with respect to the bracket bottom plate 3a.

The convex portion 12 is made by making a cut 13 of a short length L (Fig. 5) in the center near the lower edge of the vertical plate 6b of the bracket 6, and at the same time pushing out the upper part of the cut 13 to the step 1 side by pressing. It can be formed by

As explained above, the present invention provides step 1 in the rotary folding step of a motorcycle. A side concave bracket 3 having a shaft hole 10 is extended 1, and a planar U-shaped bracket 6 having a shaft hole 11 is fixed to the vehicle body by welding the periphery, and both brackets 3 and 6 are attached to the shafts of the front and rear plates. hole 10,1
1 is directly supported by a rotating shaft 8 fitted in a substantially front-back direction, and a notch 13 extending substantially in a front-back direction in the center near the lower edge of the step-side inner surface 6a of the U-shaped bracket 6 on the vehicle body side and an upper part thereof. A convex portion 12 protruding toward the step 1 side is provided, and the bottom plate upper surface 3c of the step side concave bracket 3 comes into contact with the lower surface of the convex portion 12.The lower side of the convex portion 12 and the inner surfaces of the bracket on both front and rear sides: 6a This is a step rotating shaft wear prevention structure for a two-wheeled motor vehicle, characterized in that the inner surface 3b of the bottom plate 3a on the vehicle body side comes into contact with the bottom plate 3a.

Therefore, according to the present invention, the following special effects can be obtained.

That is, even if the load F1 acting on step 1 increases to F2 when landing from a jump, etc., part of the stopper S'
This acts in the y direction and prevents the wedge action, and since the posture of step 1 with respect to the bracket 6 remains unchanged, the P L P 2 points do not move from the position shown in Figure 2, and the axis fitting surface is 1. It is held in place and reliably prevents a decrease in the cross-sectional area of the shaft 8 and an increase in the cross-sectional area of the shaft holes 10 and 11, thereby preventing a change in posture due to step 1 wear, and also preventing an increase in shaft surface pressure due to wedge action. Increase in wear due to this can be prevented.

In this way, since the shaft 8 and the shaft holes 10, 11 are in direct contact (without intervening a rubber-like elastic body), the shaft 8 and the shaft holes 10, 1
1 contact p1. p2 becomes constant, and the stopper part S'
Together with the wedge action prevention function, the above-mentioned wear prevention effect can be obtained.

Furthermore, in the present invention, the vertical plate 6b of the bracket 6 has a protrusion 1.
2 is cut and raised, even though the bracket 6 is welded to the narrow surface 5 of the vehicle body side bracket 6 around the entire circumference of the vertical plate 6b, the inner cut 13 away from the surrounding welded part allows the stopper to be Since a portion S' is formed, the position of the stopper S' is accurately determined, and the bracket bottom plate 3a
Compared to the case where the bracket is brought into contact with the lower end surface of the vertical plate 6b to form part of the stopper in the y direction, there is an advantage that the posture of step 1 can be stably maintained while maintaining the fixing strength of the bracket.

Further, the processing of the stopper part S' becomes extremely simple and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a rear view of a typical folding step, Fig. 2 is an enlarged view corresponding to the ■-■ cross section of Fig. 1, Fig. 3 is a drawing corresponding to Fig. 2 when a large load is applied, Fig. 4 is a drawing corresponding to Fig. 3 of the structure according to the present invention, and Fig. 5 is a drawing of the structure according to the present invention.
−V is a partial plan view as viewed from the arrow. 1...Folding step, 2...Car body 1
．． 3c...Top surface of bottom plate, 3...Concave bracket, 6...U-shaped bracket, 8...
...Rotation axis, 10, 11...Shaft hole, 12...
...Protrusion.

Claims (1)

[Scope of utility model registration request] In the rotary folding step of a two-wheeled motor vehicle, a concave side bracket 3 having an axle hole 10 is extended from step 1, and a U-shaped planar bracket 6 having an axle hole 11 is installed on the vehicle body.
is fixed by welding the peripheral edge portion, and both brackets 3 and 6 are fitted into the shaft holes 10° 11 of the front and rear plates.
At the same time, a notch 13 extending approximately in the front-rear direction and a convex portion 12 extending toward the step 1 side are provided in the central portion of the step-side inner surface 6a of the vehicle body-side U-shaped bracket 6 near the lower edge. The bottom plate upper surface 3c of the step side concave bracket 3 is in contact with the lower surface of the part 12, and the vehicle body side inner surface 3b of the bottom plate 3a is in contact with the lower side of the convex part 12 and the bracket inner surfaces 6a on both front and rear sides. A wear prevention structure for the step rotating shaft of a two-wheeled motor vehicle.