JPH0222519Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a wheel balance weight mounting structure used mainly in high-speed vehicles such as motorcycles and passenger cars. Furthermore, the purpose is to ensure that displacement in the circumferential direction can be prevented.

For example, when trying to improve the high-speed stability of a two-wheeled motor vehicle, it is necessary to maintain the balance of the wheels. As a countermeasure against this, conventionally, for example, as shown in FIG. 1, a weight 4 of a predetermined weight is attached to a predetermined position on the outer surface of a rim flange 3 of a rim 2 on which a tire 1 is attached by a hook 5 integrated therewith. The weight 4 is made of a lead alloy, and the hook 5 is made of a spring steel plate. One end of the hook 5 is cast into the weight 4, and is prevented from moving in the circumferential direction or falling off by a spring force in the direction of arrow F. Therefore, the insertion section L1 into the tire becomes longer, and the amount of insertion into the tire becomes larger. However, according to its structure, if a tubeless tire, which has been widely adopted recently, is used as tire 1, the hook 5
The sealing area between the tire 1 and the rim flange 3 is reduced in the portion where the rim flange 3 is present, and there is a risk that the seal may become weak. Although it is conceivable to shorten the insertion section L1 as shown in 5' for use with tube braces, there is a limit to the shortening of the section L1 due to the need to ensure the strength to hold the weight 4. On the other hand, conventionally, a rod spring for attaching the weight is provided separately from the weight, and the rod spring is formed into an M shape when viewed from the front (direction parallel to the rotation axis of the wheel) and a C shape when viewed from the side. A structure has already been proposed in which both ends of a C-shaped bar spring are elastically fitted into annular grooves provided on the inner and outer peripheries of a rim flange, and the bar spring presses the weight against the rim flange (for example, in Jitsukasho 50−138702). However, in this case, since the bar spring is not pressed by the tire, there is a risk that the weight may shift in the circumferential direction of the wheel during long-term use, causing imbalance. In addition, since the weight and bar spring are separate bodies, skill is required to install them, and there is a risk that they may wobble after installation.Furthermore, since grooves are provided in the rim portion, the strength is weakened and the number of processing steps increases.

The present invention attempts to solve all of the above-mentioned conventional problems, and one embodiment is shown in FIG. In FIG. 2, a linear intermediate portion of a plate spring 8 having a substantially C-shaped cross section is integrally cast into a weight 7 made of lead alloy, and the weight 7 is inserted into a plurality of holes 9 provided in the plate spring 8. The entry of the lead material prevents the weight 7 from moving in the longitudinal direction of the leaf spring. The outward protrusion 8a of the leaf spring 8 fits into the convex outer peripheral surface of the rim flange 10, and the thickness of its tip 8b decreases smoothly toward the tip, and is pressed only near the outer periphery of the rim flange 10. However, the contact with the tire occurs only in a small section L2 near the outer circumference of the rim flange 10. The S-shaped inward protrusion 8c of the leaf spring 8 is integrally provided with a smooth outward protrusion 8d at the inner end, and this outward protrusion 8d is connected to the rim flange 10.
It fits into the annular recess 12 on the inner surface from inside to prevent the weight 7 from escaping laterally (in the direction of arrow A).

That is, the inwardly protruding portion 8c of the leaf spring 8 is connected to the recess 12 at the outwardly protruding portion 8d at the inner end of the inwardly protruding portion 8c.
By fitting from the inside, the weight 7 is prevented from moving outward (in the direction of arrow B) and laterally (in the direction of arrow A), and by fitting the protrusion 8d into the recess 12, the weight 7 is prevented from moving outward (in the direction of arrow B) and lateral (in the direction of arrow A). This makes it possible to shorten the insertion section L2 of the distal end portion 8b of the portion 8a. The leaf spring tip 8b is in pressure contact with the rim flange 10 within a section L2 that curves away from the weight 7 from the outermost point P1 of the rim flange 10, so that it is pressed against the rim flange 10 on the side of the weight 7 (in the direction of arrow A). This prevents escape from the target and movement inward (in the reverse B direction). When a wheel equipped with such a weight 7 is attached to a motorcycle and runs at high speed, a centrifugal force acting outward (in the direction of arrow B) acts on the weight 7, but the weight 7 remains the same as before. The outward movement of the rim flange 10 is prevented by the frictional resistance caused by the crimping of the section L3 of the lateral projecting part, and the moment in the X1 direction with the section L2 as a fulcrum is The weight 7 is supported by the meshing resistance between the protrusion 8d and the recess 12, and the movement of the weight 7 in the direction of the arrow X1 is reliably prevented.

As explained above, in the present invention, a lateral protrusion is provided on the outer periphery of the rim flange 10, and the weight 7 is applied to the inner peripheral surface of the lateral protrusion continuous with the flat annular side surface of the rim flange 10 and the outer periphery. A leaf spring 8 extends substantially linearly from the inner circumferential edge of the side surface of the rim flange 10 to the tip of the side protrusion, and has a hole 9 in the middle.
The intermediate part of the plate spring 8 including the vicinity of the hole 9 is fixed to the weight 7 in an integral manner by casting, and the C-shaped outward protruding part 8a of the leaf spring 8 is fitted into the rim flange 10 to the part beyond the outermost point P1. Insert only the tip portion 8b, whose plate thickness gradually decreases toward the tip, between the rim flange and the tire, and fit the smooth outward protrusion 8d at the tip of the S-shaped inward protrusion portion 8c into the annular recess on the inner circumference of the rim. Therefore, the insertion section L2 between the tire 11 and the rim flange 10 is changed from the conventional section L1.
(Fig. 1) Since it can be significantly shortened,
The sealing performance between the tire 11 and the rim flange 10 is improved, and air leakage can be prevented, and at the same time, displacement of the weight 7 in the rim circumferential direction can be reliably prevented. In addition, since the leaf spring 8 is integrated with the weight 7, it is easier to attach the weight 7 to the rim flange 10, and there is no risk of looseness occurring between the weight 7 and the leaf spring 8 even during long-term use. This has the advantage that no imbalance occurs.

Further, in the present invention, the curved portions at both ends (outward protruding portion 8a and inward protruding portion 8c) of the leaf spring 8 are both fitted and supported by the rigid flange 10, and the intermediate portion not supported by the rim flange 10 is straight. Therefore, the middle part of the leaf spring 8 that is not supported by the rim flange 10 hardly protrudes laterally from the rim flange 10, and therefore, after long-term use, the leaf spring 8
Even if play occurs at the joint between the linear intermediate portion of the weight 7 and the weight 7, the engagement strength between the outer protrusion 8a and the rim flange side protrusion and the inner protrusion 8c and the annular recess 12 are maintained. There is no possibility that the meshing strength between the rims will decrease, and there is no possibility that the position of the leaf spring 8 on the rim flange 10 will shift in the circumferential direction or that the posture of the leaf spring 8 will change. In addition, the intermediate portion of the leaf spring 8 to which the weight 7 is integrally fixed by casting is linear, and the linear intermediate portion extends from the inner peripheral edge of the side surface of the rim flange 10 to the tip of the side projecting portion. ,
The part that supports the weight 7 is the shortest, and even if a large tensile stress is applied to the linear part of the leaf spring, it will not curve, so there will be no change in length. Therefore, at the joint with the weight 7, the leaf spring 8 will not peel off due to curvature. There is an advantage that the bonding strength with the weight 7 is stable for a long period of time. In short, the middle part of the leaf spring 8 supporting the weight 7 is made straight, and the part protruding outward and inward from the weight 7 is supported by the rim flange 10 at a part as close to the weight 7 as possible. shape, and there is less loosening, and since the outer peripheral part of the rim flange 10 is extended laterally, the centrifugal force of the weight 7 can be reliably supported on the inner peripheral surface of the lateral extended part. Furthermore, even if the tip insertion section L2 of the leaf spring outward projection 8a is shortened, there is no fear that the weight 7 will come off, and since the insertion section L2 can be shortened, air leakage can be prevented. That is, the weight 7 can be reliably supported without increasing the insertion section L2, and as a result, air leakage can be prevented. Furthermore, according to the present invention, the inwardly protruding portion of the leaf spring 8 is S-shaped, and the smooth outwardly protruding portion 8d at the tip engages with the annular recess 12, thereby achieving smooth engagement between the curved portions and reducing concentrated stress. This has the advantage of preventing this and improving durability. Furthermore, in the present invention, since the material of the weight 7 is inserted into the hole 9 formed in the intermediate straight portion of the leaf spring 8, the bonding strength is increased, and furthermore, no bending stress is applied to the leaf spring 9 near the hole 9. Looseness near hole 9 is minimized. Furthermore, since the thickness of the tip 8b of the leaf spring 8 gradually decreases toward the tip, displacement in the circumferential direction can be reliably prevented without impairing the sealing performance between the rim flange 10 and the tire 11. There are benefits to be gained.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional partial view showing the conventional structure;
FIG. 2 is a partial vertical cross-sectional view showing an embodiment of the present invention. 7... Weight, 8... Leaf spring, 8b... Tip, 8c... Inward protrusion, 10... Rim flange.

Claims (1)

[Scope of utility model registration request] A lateral protrusion is provided on the outer periphery of the rim flange 10,
Applying the weight 7 to the flat annular side surface of the rim flange 10 and the inner circumferential surface of the lateral protrusion continuous to its outer circumference,
The weight 7 extends in a substantially straight line from the inner peripheral edge of the side surface of the rim flange 10 to the tip of the side protrusion, and has a hole 9 in the middle.
A tip portion 8b which is integrally cast and fixed to the plate spring 8 and whose plate thickness gradually decreases toward the tip by fitting the C-shaped outward protruding portion 8a of the leaf spring 8 to the outer periphery of the rim flange 10.
Insert the chisel between the rim flange and the tire, and
Smooth outward protrusion 8 at the tip of the shaped inward protrusion 8c
A wheel balance weight mounting structure characterized in that d is fitted into an annular recess on the inner periphery of the rim.