JPH11294541A - Wheel balancing weight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely fit a balancing weight using no lead for environmental conservation by forming a weight main body with a cold forged metal other than lead, and coupling and caulking a clip to a spigot section formed on the weight main body to fix the clip. SOLUTION: This wheel balancing weight 10 is constituted of a weight main body 20 and a clip 30 fixed to the weight main body 20. A bar made of a metal material (e.g. iron) other than lead is cut to the weight required for balancing a wheel and is molded into the prescribed shape by cold forging to manufacture the weight main body 20, and it has an outer shape extending in an arc along the inner periphery of the curl section of the flange section 40 of the wheel. The weight main body 20 has a spigot section 22 at the center section in the longitudinal direction of the weight main body 20 on the contact face with the flange section 40, the coupling section 33 of the clip 30 is coupled with the radial direction section 22d of the spigot section 22, and the clip 30 is fixed by caulking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a wheel balancing weight.

[0002]

2. Description of the Related Art A vehicle in which a vehicle wheel and a tire are assembled may have a dynamic imbalance when the wheel rotates, and a balancing weight (also referred to as a balance weight) is usually mounted to correct the dynamic imbalance. As shown in FIGS. 10 to 12, the conventional balancing weight 1 includes a Pb (lead) weight main body 2 and a clip 3 having one end embedded therein. The specifications of the conventional balancing weight are defined in JASO, and the manufacturing method and manufacturing specifications are as follows. Weight body: Pb having a relatively large specific gravity and a low melting point is used as a material, and is manufactured by casting. Clip: A hook made of spring steel with excellent elasticity and used to lock the balancing weight to the flange of the wheel. The clip is attached to the weight body by a method in which one end of the clip is cast into the weight body. Surface treatment: The clip is subjected to a surface treatment for rust prevention, electric corrosion prevention and the like. Heat treatment: The clip is subjected to a heat treatment before casting into the weight body in order to ensure elastic properties, but the melting temperature of Pb is low, so that the elastic properties of the clip do not decrease during casting.

[0003]

In recent years, from the viewpoint of environmental protection, industrial use of heavy metals such as Pb has been refrained, and Pb tends to be replaced by other metals even in balancing weights. Iron, copper, etc. are conceivable as alternative materials with a proven track record of industrial practical use, low unit cost of materials, environmental safety, and relatively high specific gravity, but these raw materials have high melting points, The following problems arise with respect to the manufacture of the weight body and the type and method of attaching the clip to the weight. (B) When the clip and the weight are cast integrally, the melting temperature of the clip and the weight are close, so the formation of an alloy phase,
A decrease in the elastic properties of the clip due to the influence of heat or the like is considered, and the conditions of the casting process are restricted. Even if an attempt is made to heat-treat the clip after casting, since the clip is integrated with the weight, the heat-treatment conditions are severe and the cost is high. (B) If the clip is subjected to a surface treatment before the casting step, the clip is exposed to a high temperature at the time of casting, and the surface treatment layer is damaged. (C) Increased energy input due to casting of high melting point material,
It is essential to increase the cycle time for heating and cooling, and to strengthen the specifications of the casting equipment including the mold, and the manufacturing cost is inevitably high. There is a die casting method as a casting method with high productivity, but the equipment is large for high melting point materials, and the industrial practicality is poor. (D) In the casting method, burrs may be generated, and a deburring step is required. An object of the present invention is to provide a wheel balancing weight that replaces lead with another metal and that is excellent in productivity without damaging the spring characteristics and surface treatment layer of the clip when the clip is attached to the weight body. is there.

[0004]

The present invention to achieve the above object is as follows. (1) Consisting of a weight body and a clip fixed to the weight body, the weight body is made of a metal material other than lead, and has an outer shape extending in an arc along a flange portion of a wheel to be mounted. At the contact surface with the flange portion of the mounted wheel and at the center of the length of the weight body, a spigot portion having a bottom surface recessed from the contact surface and a pair of side surfaces rising at the width direction end of the bottom surface. The spigot portion has a radial portion extending in the radial direction of the arc and having a depth equal to or greater than the thickness of the clip, and the outer shape of the weight body and the spigot portion are cooled. The clip has resiliency, extends along the bottom surface of the spigot portion of the weight body, and is folded back at an end of a flange portion of a wheel to be mounted. And having an outer shape for gripping an end of the flange portion, and having an engaging portion for engaging with the weight body, wherein the clip fits the clip to the spigot portion of the weight body. Before joining, the side near the contact surface with the wheel in the width direction both ends of the clip is chamfered, and then at least a part of the pair of side surfaces of the spigot portion is swaged, and A wheel balancing weight fixed to the weight body by pressing both ends. (2) The weight body is composed of a weight body and a clip fixed to the weight body, and the weight body is made of a metal material other than lead, and has an outer shape extending in an arc along a flange portion of a wheel to be mounted. At the contact surface with the flange portion of the mounted wheel and at the center of the length of the weight body, a spigot portion having a bottom surface recessed from the contact surface and a pair of side surfaces rising at the width direction end of the bottom surface. The spigot portion has a radial portion extending radially of the arc and having a depth greater than the thickness of the clip, the spigot portion having at least a radius of the arc at the radial portion. An engaging portion that engages with the clip inward in the direction, the outer shape of the weight body and the spigot portion are formed by cold forging, and the clip includes a spring. The weight body has an outer shape that extends along the bottom surface of the spigot portion of the weight body, is folded back at the end of the flange portion of the mounted wheel, and grips the end of the flange portion, Having an engaging portion that fits into the engaging portion of the spigot portion,
The clip is fixed to the weight main body by fitting the clip to the spigot portion of the weight main body, caulking at least a part of the pair of side surfaces of the spigot portion, and pressing the width direction end of the clip. , The wheel balancing weight. (3) The engagement portion of the weight main body is formed on the pair of side surfaces of the radial portion of the spigot portion, and is formed of a tapered portion whose interval decreases radially outward of the arc. The wheel balancing weight according to 1) or 2). (4) The engaging portion of the weight main body is formed on the pair of side surfaces of the radial portion of the spigot portion, and protrudes from each of the pair of side surfaces toward a facing side surface. Or the wheel balancing weight according to (2).

The wheel balancing weights (1), (2), (3) and (4) are preferable from the viewpoint of environmental protection because metals other than lead are used for the material of the weight body. Further, since the weight body is formed by cold forging, the forming is easy. Further, the fixing of the clip to the weight body is not performed by casting, but by caulking, so that the characteristics of the clip are not affected.

[0006]

1 to 3 show a first embodiment of the present invention, and FIGS. 4 to 6 show a second embodiment of the present invention. 7 to 9 show a weight body and a clip caulking structure applicable to both embodiments. Portions common to both embodiments are denoted by the same reference numerals throughout both embodiments. First, a configuration of a portion common to both embodiments will be described with reference to, for example, FIGS. 1 to 3 and FIGS. 7 to 9.

The wheel balancing weight of the present invention (the balancing weight is also called a balance weight)
10 comprises a weight body 20 and a clip 30 fixed to the weight body.

The weight body 20 is made of a rod material made of a metal material other than lead (a metal material having a melting point higher than that of lead and a material having a relatively large specific gravity, for example, iron or copper is preferable). And is formed into a predetermined shape (a shape that can be attached to the inner peripheral surface of the flange of the wheel) by cold forging. However, in addition to this method, the basic cross-sectional shape of the weight body 20 is previously formed into a bar having a predetermined cross-sectional shape by rolling (hot or cold) or drawing (hot or cold). The material may be cut into a predetermined length and the material may be formed into the shape of the weight body 20 by cold forging.

If the basic shape of the weight main body 20 is formed in advance in this manner, the basic cross-sectional shape requiring the most forming force is not formed as compared with the case where the bar is cut and cold forged. Since only the molding of the spigot portion 22 and both ends need be performed, the cold forging process and the molding load can be reduced, the cost of the mold can be reduced, the molding time can be made more efficient, and the balancing weight can be reduced. Can be offered at a price.

The weight body 20 has an outer shape extending in an arc along the inner peripheral surface of the curled portion of the flange portion 40 of the wheel to be mounted.
0 in the longitudinal direction. The weight body 20 has a spigot portion 22 at the contact surface with the flange portion 40 and at the center of the length (longitudinal direction) of the weight body 20, and the spigot portion 22 has a contact surface with the flange portion 40. The bottom surface 22a recessed from the bottom surface 20a and the contact surface 20 at the end of the bottom surface 22a in the width direction (the same direction as the longitudinal direction of the weight body 20).
and a pair of side surfaces 22b that stand up toward “a”.

The spigot portion 22 has a radial portion 22c extending in the radial direction of the arc along the flange portion 40, and an axial portion 22d extending in the axial direction of the mounted wheel. The radial portion 22c has a depth equal to or greater than the thickness of the clip 30 required to engage the clip 30 by swaging. The axial portion 22d is
It extends in the axial direction of the arc and has a depth substantially equal to the thickness of the clip 30. The spigot portion 22 includes a radial portion 22c.
When the weight body 20 moves toward the radially inward of the arc along the flange portion 40, the weight body 2
0 is an engaging portion 23 that engages with the clip 30 (an engaging portion 23 that restrains the weight body 20 from engaging with the clip 30 when the weight body 20 attempts to move inward in the radial direction of the arc with respect to the clip 30). )have. Weight body 20
The spigot portion 22 is unnecessary for the surface 20b located outside the wheel axis direction among the surfaces orthogonal to the wheel axis when the wheel is mounted, and the surface 20c not contacting the wheel among the surfaces orthogonal to the wheel axis. The outer shape of the weight main body 20 and the molding of the spigot portion 22 are performed by cold forging from the viewpoint of ease of molding and improvement in efficiency.

The clip 30 is provided with a spring property. The clip 30 extends along the bottom surface 22 a of the spigot portion 22 of the weight body 20, and extends from the rising portion 42 of the wheel flange portion 40 to the wheel flange portion 4.
The front end 41 of the wheel flange is bent from the outside while being curved so as to wrap around the front end 41 of the wheel flange portion 40 from the outside. Hold down and end there. The clip 30 has a radial portion 30c extending in the radial direction of the arc along the flange portion 40 and an axial portion 30d extending in the axial direction of the wheel 40 to be mounted.
The radial portion 30c of the clip 30 is
Has an engaging portion 33 that fits into the engaging portion 23 of the spigot portion 22.

As shown in FIG. 9 (a), the clip 30 is fitted to the spigot portion 22 of the weight main body 20 by bringing the clip surface into close contact with the spigot portion bottom surface 22a, as shown in FIG. This is performed by caulking at least a part of the pair of side surfaces 22 b of the spigot portion 22 and pressing the widthwise end of the clip 30. As shown in FIG.
This is performed by squeezing at least a part of b in the depth direction with a punch 50 so that the weight body material protrudes onto the clip width direction end.

However, in this method, as can be seen from the shape after caulking, it is necessary that the weight material has ductility, a large caulking force is required, and the space from the contact surface 20 to the wheel to the clip surface becomes large. Inlay part 2
7, it is necessary to increase the depth of the clip 2, so that as shown in FIG.
Before fitting into the clip 2, as shown in FIG.
7 are chamfered at both end portions in the width direction and close to the contact surface 20 with the wheel (the chamfered portion is indicated by 30a).
A method of caulking by pushing the weight body material with the punch 50 in the step (b) is preferable. Clip 3
The chamfering for 0 may be formed by a chamfering punch, cut by a grinder, or any other method. This method does not require a material to be swaged than the method shown in FIG. 9, and the flow of the material is smooth. Caulking can be performed even if the specifications are small. In addition, since caulking can be performed with a small amount of processing, caulking can be performed even when the weight material has low ductility.

More preferably, in addition to the chamfering of the clip 30 shown in FIG. 7, the depth of the spigot portion 22 is made equal to the thickness of the clip 30 as shown in FIG.
Alternatively, the weight body material is pushed in by the punch 50 whose central portion has been released in the step (b) by making it substantially the same, so that the space from the contact surface 20 to the wheel to the surface of the clip 30 is further reduced as compared with the method of FIG. It is possible to increase the density of the balancing weight, so that the width of the weight can be shortened, making it easier to balance, and also simplifying the production and mounting it on the rim. Become. If the spigot portion 22 can be made shallow, the pressing force of the forging process can be further reduced, and investment in a press machine and a die can be reduced, and as a result, a low-cost balancing weight can be provided. Normal,
The weight body 20 is subjected to a surface treatment such as electrodeposition coating, and the clip 30 is usually subjected to a surface treatment such as galvanization and / or electrodeposition coating. Clip 3
0 indicates that the wheel balancing weight 10 is elastically engaged with the wheel flange 40 when the wheel balancing weight 10 is mounted on the flange 40 of the wheel.

The fixing between the weight body 20 and the clip 30 is as follows. With respect to the centrifugal force applied to the weight body 20 in the radial direction of the wheel when the wheel is rotating, the weight body 20 has an outer shape as an arc and its outer peripheral surface is in close contact with the inner peripheral surface of the tip portion 41 of the flange portion 40 of the wheel. Because
Pressed from the outer peripheral side by the distal end portion 41 of the flange portion 40, and for a force inward in the radial direction of the wheel,
The engaging portion 33 of the clip 30 and the engaging portion 2 of the spigot portion 22
2 is supported. With respect to the wheel axial load applied to the weight body 20, the clip 30 is elastically engaged with the end portion 41 of the flange portion at the folded portion, and the weight body 20 is axially attached to the clip 30 by caulking at the engaging portion 23. The weight main body 20 is supported by the flange portion 40 via the clip 30 because the weight main body 20 is fixed so as not to be movable. In the circumferential direction of the wheel, the weight body 20 is clipped by the spigot portion 22.
Is fitted and fixed. Therefore, the weight main body 20 and the clip 30 are fixed in any direction.

Next, specific parts of each embodiment of the present invention will be described. In the first embodiment of the present invention, as shown in FIGS. 1 to 3, the engaging portion 23 of the weight main body 20 includes a flange portion 40 formed on the radial portion 22 c of the spigot portion 22 of the weight main body 20. There is a tapered portion 23a whose interval decreases as going outward in the radial direction of the arc along. The engaging portion 33 of the clip 30 is formed at a portion corresponding to the tapered portion 23 a of the weight main body 20, and includes a tapered portion 33 a having a shape capable of engaging with the engaging portion 23. Weight body 2
0 taper 23a and clip 30 taper 33
a are engaged with each other. When engaged by the tapered portion 23a, the engaging portion 23 engages with the clip 30 only inward in the radial direction of the arc.

In the second embodiment of the present invention, as shown in FIGS. 4 to 6, the engaging portion 23 of the weight main body 20 is formed on a pair of side surfaces 22b of the spigot portion 22 of the weight main body 20, and is opposed to each other. There is a pair of protrusions 23b protruding toward the side surface 22b. The engaging portion 33 of the clip 30 is formed at a portion corresponding to the protruding portion 23 b of the weight main body 20, and includes a retreating portion 33 b capable of engaging with the engaging portion 23. The projecting portion 23b of the weight body 20 and the retreating portion 33b of the clip 30 are engaged with each other. When the engaging portion 23 is engaged by the projecting portion 23b and the retreating portion 33b, the engaging portion 23 engages with the clip 30 inward and outward in the radial direction of the arc. In addition, when the weight body 20 and the clip 30 are joined by chamfering the both ends of the solid clip 30 in the width direction first and then caulking the weight body material, the connection between the weight body 20 and the clip 30 is performed. Since the strength is markedly increased, depending on the type of balancing weight, there is no need to provide a convex engaging portion 23 formed on the spigot portion 22 of the weight main body 20.
If there is a concave engaging portion 33 provided on the side, the weight main body material is pushed into the engaging portion 33 of the clip 30, and the engaging force between the weight main body 20 and the clip 30 can be sufficiently ensured. Therefore, even when the convex engaging portion 23 is not formed on the spigot portion 22 of the weight main body 20 and the concave engaging portion 33 is formed on the clip 30 side,
Included in the present invention.

[0019]

According to the wheel balancing weight of the first aspect, the following effects can be obtained. B) Since metal other than lead is used for the weight body, it is preferable in environmental conservation. (B) Since the weight body is formed by cold forging, productivity is good. C. The weight body and the surface treatment layer of the clip are not damaged, and the spring characteristics of the clip are not impaired. D. Since the clip is chamfered and then caulked with the weight main body, high rigidity caulking is possible with a small amount of processing. According to the wheel balancing weight of the second aspect, the following effects can be obtained. B) Since metal other than lead is used for the weight body, it is preferable in environmental conservation. (B) Since the weight body is formed by cold forging, productivity is good. C. The weight body and the surface treatment layer of the clip are not damaged, and the spring characteristics of the clip are not impaired. D. Since the chamfers are provided at both ends in the width direction of the clip, the coupling force between the clip and the weight body is increased, and the space between the wheel and the clip can be reduced. According to the wheel balancing weight of the third aspect, since the engaging portion is formed by the tapered portion, in addition to the effect of the first or second aspect,
Even if the weight body tries to move in the radial direction of the wheel with respect to the clip, the movement can be reliably prevented. According to the wheel balancing weight of the fourth aspect, since the engaging portion includes the projecting portion and the retreating portion, in addition to the effect of the first or second aspect, the weight main body is inward in the wheel radial direction with respect to the clip. , The movement can be surely prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of a wheel balancing weight according to a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a sectional view of a wheel balancing weight according to a second embodiment of the present invention.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a plan view of FIG. 4;

FIG. 7 is a cross-sectional view showing caulking applied to the present invention.

FIG. 8 is a cross-sectional view showing another caulking process applied to the present invention.

FIG. 9 is a cross-sectional view showing another caulking process applied to the present invention.

FIG. 10 is a sectional view of a conventional wheel balancing weight.

FIG. 11 is a front view of FIG. 10;

FIG. 12 is a plan view of FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wheel balancing weight 20 Weight main body 22 Inlay portion 22a Bottom surface of inlay portion 22b Side surface of inlay portion 22c Radial portion of inlay portion 23 Engagement portion 23a Taper portion 30 Clip 30a Chamfer 40 Wheel flange portion 41 Wheel flange end Department

Claims (4)

[Claims] 1. A weight main body and a clip fixed to the weight main body, wherein the weight main body is made of a metal material other than lead, and has an outer shape extending in an arc along a flange portion of a wheel to be mounted. A spigot having a bottom surface recessed from the contact surface and a pair of side surfaces rising at a widthwise end of the bottom surface at a contact surface with the flange portion of the wheel to be mounted and at a central portion of the length of the weight body. The spigot portion has a radial portion extending in the radial direction of the arc and having a depth equal to or greater than the thickness of the clip, the outer shape of the weight body and the spigot portion. Is formed by cold forging. The clip has resiliency, extends along the bottom surface of the spigot portion of the weight body, and has an end portion of a flange portion of a wheel to be mounted. It has an outer shape that is folded back to grip an end of the flange portion, and has an engaging portion for engaging with the weight main body. The clip attaches the clip to the spigot portion of the weight main body. Before fitting, the side near the contact surface with the wheel of the width direction both ends of the clip is chamfered, and then at least a part of the pair of side surfaces of the spigot portion is swaged to form the width of the clip. A wheel balancing weight fixed to the weight body by pressing both ends in the direction. 2. A weight main body and a clip fixed to the weight main body, wherein the weight main body is made of a metal material other than lead, and has an outer shape extending in an arc along a flange portion of a wheel to be mounted. A spigot having a bottom surface recessed from the contact surface and a pair of side surfaces rising at a widthwise end of the bottom surface at a contact surface with the flange portion of the mounted wheel and at a center portion of the length of the weight body. And the spigot portion has a radial portion extending in the radial direction of the arc and having a depth greater than the thickness of the clip, and the spigot portion includes at least the arc in the radial portion. The clip has an engaging portion that engages with the clip inward in the radial direction, and the outer shape of the weight body and the spigot portion are formed by cold forging. With a spring property, the weight body has an outer shape that extends along the bottom surface of the spigot portion of the weight body, is folded back at an end of a flange portion of a mounted wheel, and grips an end of the flange portion, The clip has an engaging portion that fits into the engaging portion of the spigot portion of the weight body. The clip fits the clip into the spigot portion of the weight main body, and the pair of side surfaces of the spigot portion. A wheel balancing weight fixed to the weight body by caulking at least a part of the clip and pressing an end of the clip in the width direction. 3. The engagement portion of the weight main body is formed of a tapered portion formed on the pair of side surfaces of the radial portion of the spigot portion, the interval of which decreases as it goes radially outward of the arc. The wheel balancing weight according to claim 1 or claim 2. 4. The engagement portion of the weight body is formed on the pair of side surfaces of the radial portion of the spigot portion, and protrudes from each of the pair of side surfaces toward the opposing side surface. The wheel balancing weight according to claim 1 or 2.