JP2006153079A - Balance weight for tire wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a balance weight for a tire wheel capable of reducing damage of a rim part caused when driving a clip of the balance weight into the rim part of the tire wheel while preventing a shape and a structure from becoming complicated. <P>SOLUTION: A rim nipping part 43 of the clip 4 of the balance weight 1 nips the rim part 21 of the tire wheel. Outer peripheral face parts 410, 411 in both end parts in the peripheral direction in an inner peripheral side plate part 41 of the rim nipping part 43 are formed on an inner side in the radial direction more than a central part 412 in the peripheral direction. Consequently, both end parts in the peripheral direction in the inner peripheral side plate part 41 of the rim nipping part 43 do not bite a peripheral face on an inner peripheral side of the rim part 21 when driving the rim nipping part 43 into the rim part 21 to prevent damage of the rim part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a balance weight for improving the balance of mass in a wheel assembly state in which an automobile tire is incorporated in a rim.

  In the wheel assembly state in which tires such as automobiles are incorporated in the rim, if the mass imbalance in the circumferential direction around the rotation axis of the wheel assembly and the mass imbalance in the rotation axis direction increase, a body called vibration or shake of the steering wheel A problem such as occurrence of vertical vibration of the sheet occurs. The vibration and noise generated during the driving are due to the unbalance of the wheel assembly, and in order to cancel this unbalance, the unbalance of the wheel assembly is measured with a dedicated measuring machine and balanced so as to cancel it. A weight (also referred to as a wheel balance weight) is attached to the wheel to correct it.

  The shape of the conventional balance weight is shown in FIGS. FIG. 6 shows a set state before driving a balance weight, and FIG. 7 shows a state after driving the balance weight.

  The balance weight 1 is fixed to the clip 4 made of a metal plate that is fixed to the rim portion 21 by sandwiching the rim portion 21 of the tire wheel 2, and to the clip 4 on the inner peripheral side of the rim portion 21 of the tire wheel 2. And a metal weight 5 to be made.

  The clip 4 has an inner peripheral side plate portion 41 and an outer peripheral side plate portion 42 that sandwich the rim portion 21 of the tire wheel 2, and is fixed to the rim portion 21. 43 is a surface that extends radially inward of the tire wheel 2 along the surface of the wheel portion 22 of the tire wheel 2 from the tip of the inner peripheral side plate portion 41 of the tire wheel 2 and the weight 5 does not face the wheel portion 22 of the tire wheel 2. And a weight fixing portion 44 fixed to the head.

  The inner peripheral side plate portion 41 of the rim clamping portion 43 is located on the inner peripheral surface side of the rim portion 21 of the tire wheel 2 and is linear in the tangential direction (direction perpendicular to the radial direction and the axial direction) of the tire wheel 2. The both ends in the circumferential direction of the inner peripheral side plate portion 41 are in contact with the inner peripheral surface (the peripheral surface on the inner peripheral side) of the rim portion 21 of the tire wheel 2. Similarly, the outer peripheral side plate portion 42 of the rim clamping portion 43 is located on the outer peripheral surface side of the rim portion 21 of the tire wheel 2 and extends linearly in the tangential direction of the tire wheel 2 in parallel with the inner peripheral side plate portion 41. It has a shape.

Conventionally, as the material of the weight 5, lead or a lead alloy that is easily plastically deformed is usually used. However, since the lead-based material has a problem such as a load on the natural environment, the clip 4 has the weight 5 as a material. For example, the following Patent Documents 1 to 3 propose that the material is made of an iron-based material.
Registered Utility Model Publication No. 3046046 JP 2002-54686 A JP 2002-61714 A

  However, since the clip 4 manufactured using an iron-based material has high rigidity, when the clip 4 is driven into the rim portion 21 of the tire wheel 2 with a hammer, both ends in the circumferential direction of the inner peripheral side plate portion 41 of the clip 4 are tires. The wheel 2 has a problem that it bites into and damages the inner peripheral surface of the rim portion 21 of the wheel 2.

  The present invention has been made in view of the above problems, and can reduce damage to the rim portion that occurs when a clip of a balance weight is driven into the rim portion of the tire wheel while suppressing the complexity of the shape and structure. Its purpose is to provide a balance weight.

  The invention will be described below. However, the shape of the clip of the present invention described below is described on the assumption that the tire wheel is attached to the tire wheel, but the tire wheel attachment state should be interpreted to mean such a shape, In this sense, the present invention should be construed to include a balance weight before the tire wheel is mounted.

  The balance weight for a tire wheel of the first invention made to solve the above problems is a clip made of a metal plate fixed to the rim portion by sandwiching a rim portion which is an outer peripheral edge portion of the tire wheel, A metal weight that is positioned on the inner peripheral side of the tire wheel rim and fixed to the clip, and the clip includes an inner peripheral plate and an outer peripheral plate that sandwich the rim of the tire wheel. A rim sandwiching portion having a substantially U-shaped cross section having a portion, and a front end of an inner peripheral side plate portion of the rim sandwiching portion while facing a surface of a wheel portion of the tire wheel extending radially inward from the rim portion. A weight fixing portion having a shape extending radially inward of the tire wheel and having the weight fixed to a surface of the tire wheel not facing the wheel portion. In balance weight for Yahoiru, wherein among the inner peripheral side plate portion of the rim clamping portion, the circumferential both ends, it is characterized in that curved radially inward than the circumferential direction central portion.

  This curve may be curved with a constant curvature, or may be curved in a shape close to bending. In the above description, the circumferential direction means the circumferential direction of the tire wheel, the inner circumferential side means the radial inner side of the tire wheel, and the outer circumferential side means the radial outer side of the tire wheel. . Further, the inner peripheral surface of the rim portion of the tire wheel described above does not need to have the same diameter in each axial portion of the tire wheel, and the diameter usually increases as the distance from the tire wheel increases. .

  That is, according to the present invention, since both end portions in the circumferential direction of the inner peripheral side plate portion of the rim clamping portion which is the rim clamping portion of the clip are bent radially inward from the central portion in the circumferential direction, the rim clamping portion of the clip Even when the tire is driven into the rim portion of the tire wheel, the both ends in the circumferential direction out of the inner peripheral side plate portion of the rim clamping portion of this clip bite into the peripheral surface on the inner peripheral side of the rim portion of the tire wheel, or the surface thereof. It is possible to satisfactorily prevent or reduce scratches on the coating film formed on the surface. Moreover, since the inner peripheral side plate portion of the rim clamping portion of the clip is curved, the rigidity can be increased as compared with the conventional planar shape if the plate thickness is equal.

  In a preferred aspect, the inner peripheral side plate portion of the rim clamping portion is curved with a predetermined radius of curvature smaller than the inner diameter of the rim portion of the tire wheel in a plane extending in the radial direction of the tire wheel. Yes. In this way, the shape of the inner peripheral side plate portion of the rim clamping portion is simplified, which facilitates manufacture, and the inner peripheral side plate portion of the rim clamping portion of the clip and the peripheral surface on the inner peripheral side of the rim portion of the tire wheel. The contact area with can be increased.

  The balance weight for a tire wheel of the second invention made to solve the above problems is a clip made of a metal plate fixed to the rim portion by sandwiching a rim portion which is an outer peripheral edge portion of the tire wheel, A metal weight that is positioned on the inner peripheral side of the tire wheel rim and fixed to the clip, and the clip includes an inner peripheral plate and an outer peripheral plate that sandwich the rim of the tire wheel. A rim sandwiching portion having a substantially U-shaped cross section having a portion, and a front end of an inner peripheral side plate portion of the rim sandwiching portion while facing a surface of a wheel portion of the tire wheel extending radially inward from the rim portion. A weight fixing portion having a shape extending radially inward of the tire wheel and having the weight fixed to a surface of the tire wheel not facing the wheel portion. In balance weight for Yahoiru, of the inner peripheral side plate portion of the rim clamping portion, the outer peripheral surface of the circumferential ends is characterized in that it is smaller in diameter than the outer peripheral surface of the circumferentially central portion.

  The diameter reduction is preferably formed at the time of clip sheet metal processing, particularly press punching, but may be formed by subsequent processing. In the above description, the circumferential direction means the circumferential direction of the tire wheel, the inner circumferential side means the radial inner side of the tire wheel, and the outer circumferential side means the radial outer side of the tire wheel. . Further, the inner peripheral surface of the rim portion of the tire wheel described above does not need to have the same diameter in each axial portion of the tire wheel, and the diameter usually increases as the distance from the tire wheel increases. .

  That is, according to the present invention, of the inner peripheral side plate portion of the rim clamping portion that is the rim clamping portion of the clip, the outer peripheral surface portions at both circumferential end portions are smaller in diameter than the outer peripheral surface portion at the circumferential central portion. Even when the rim clamping part of the clip is driven into the rim part of the tire wheel, both ends in the circumferential direction of the inner peripheral side plate part of the rim clamping part of the clip bite into the peripheral surface on the inner peripheral side of the rim part of the tire wheel. Therefore, it is possible to satisfactorily prevent or reduce damage to the rim portion or the coating film formed on the surface thereof. In addition, the effect of reducing scratches can be realized with almost no complicated manufacturing process and clip structure.

  In a preferred aspect, of the inner peripheral side plate portion of the rim clamping portion, the outer peripheral surface portions at both ends in the circumferential direction are smaller in diameter within a range of 0.1 to 2 mm than the outer peripheral surface portion at the central portion in the circumferential direction. In a normal tire wheel for a passenger car, when the diameter reduction is 0.1 mm or less, the effect of reducing scratches can hardly be expected. When the diameter reduction is 2 mm, the inner peripheral side plate portion and the rim portion of the rim clamping portion The contact with the inner peripheral side surface deteriorates.

  More preferably, among the inner peripheral side plate portions of the rim clamping portion, the outer peripheral surface portions at both ends in the circumferential direction are smaller in diameter in the range of 0.5 to 1 mm than the outer peripheral surface portion at the circumferential central portion. In this way, it is possible to realize a further damage reduction effect while suppressing deterioration in contact between the inner peripheral side plate portion of the rim clamping portion and the inner peripheral side peripheral surface of the rim portion.

  In a preferred aspect, of the inner peripheral side plate portion of the rim clamping portion, the outer peripheral surface portions at both end portions in the circumferential direction having a small diameter have a width of 1 to 5 mm in the circumferential direction. If this width is 1 mm or less, the effect of reducing scratches can hardly be expected. If this width is 5 mm, the contact between the inner peripheral side plate portion of the rim clamping portion and the inner peripheral side peripheral surface of the rim portion is deteriorated.

  Preferred embodiments of the present invention are described below. However, the present invention should not be construed as being limited to these embodiments, and it is needless to say that the technical idea of the present invention may be realized by other known components or equivalent components.

  The balance weight for the tire wheel of Example 1 will be described with reference to the drawings. . FIG. 1 is an axial sectional view of the balance weight, and FIG. 2 is a front view of the balance weight viewed in the axial direction. However, illustration of the tire wheel 2 is abbreviate | omitted in FIG. In addition, the circumferential direction, axial direction, and radial direction which are said in this Example point to those of a tire wheel.

  The balance weight 1 includes a plate-like clip 4 that is fixed to the rim portion 21 by sandwiching the rim portion 21 of the tire wheel 2, and a clip 4 that is positioned on the inner peripheral side of the rim portion 21 of the tire wheel 2. The weight 5 is fixed. The clip 4 and the weight 5 are made of an iron-based material. The shape of the clip 4 described below is formed by sheet metal processing.

  The clip 4 has an inner peripheral side plate portion 41 and an outer peripheral side plate portion 42 that sandwich the rim portion 21 of the tire wheel 2, and is fixed to the rim portion 21. A substantially flat plate-like weight fixing portion 44 extending from the front end (radially inner edge) of the inner peripheral side plate portion 43 of the tire 43 to the radially inner side of the tire wheel 2 along the surface of the wheel portion 22 of the tire wheel 2; have. The weight fixing portion 44 has three caulking portions 45 to 47 at predetermined intervals in the circumferential direction. The weight 5 is fixed to the weight fixing portion 44 by these caulking portions 45 to 47 of the weight fixing portion 44.

  The inner peripheral side plate portion 41 of the rim clamping portion 43 has a shape that is located on the inner peripheral surface side of the rim portion 21 of the tire wheel 2 and extends substantially in the circumferential direction. On the other hand, the outer peripheral side plate portion 42 of the rim clamping portion 43 has a shape that is located on the outer peripheral surface side of the rim portion 21 of the tire wheel 2 and linearly extends in the tangential direction of the tire wheel 2. .

  In the above description, the rim portion 21 of the tire wheel 2 means an outer peripheral tip portion that is far away from the tire wheel 2 in the outer peripheral portion of the tire wheel 2, and the wheel portion 22 of the tire wheel 2 is A portion that is located on a smaller diameter side than the surface 51 on the radially outer side of the weight 5 and that extends mainly in the radial direction is referred to.

  The shape of the balance weight 1 described above is equal to the conventional one described above except for the shape of the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4. Hereinafter, the shape of the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4 that characterizes this embodiment will be described in more detail.

  This embodiment is characterized in that the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4 is curved at a predetermined curvature radius R as shown in FIG. Thereby, among the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4, both circumferential ends thereof are curved radially inward from the circumferential central portion.

  That is, according to this embodiment, both end portions in the circumferential direction of the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4 are bent radially inward from the central portion in the circumferential direction. Further, the radius of curvature of the outer peripheral surface portion 41 a of the inner peripheral side plate portion 41 of the rim clamping portion 43 is set to be smaller than the radius of the peripheral surface 21 a on the inner peripheral side of the rim portion 21.

  In this way, when the rim holding portion 43 of the clip 4 is driven into the rim portion 21 of the tire wheel 2, both circumferential ends of the outer peripheral surface portion 41 a of the inner peripheral side plate portion 41 of the rim holding portion 43 of the clip 4. The outer peripheral surface portions 410 and 411 of the tire wheel 2 do not bite into the peripheral surface 21 a on the inner peripheral side of the rim portion 21 of the tire wheel 2. Accordingly, the biting does not damage the surface of the inner peripheral surface 21a of the rim portion 21 of the tire wheel 2 or the coating film formed on the surface. Alternatively, this scratch can be minimized. Further, since the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4 is curved, its rigidity can be increased as compared with the conventional planar shape if the plate thickness is equal.

(Modification 1)
In the above-described embodiment, the inner peripheral side plate portion 41 of the rim clamping portion 43 of the clip 4 is configured to have the same radius of curvature in each circumferential portion, but the outer peripheral surface portion 41 a of the inner peripheral side plate portion 41 has both ends in the circumferential direction. The outer peripheral surface portions 410 and 411 of the portion have a shape that is smaller in diameter by a predetermined dimension (preferably 0.1 to 2 mm, more preferably 0.5 to 1 mm) than the outer peripheral surface portion 412 of the central portion in the circumferential direction. For example, the radius of curvature does not need to be constant in each part in the circumferential direction, and may be a bent taper as shown in FIG. 3, for example. In addition, the circumferential direction both ends of the inner peripheral side plate part 41 having a bent taper shape referred to here are portions of 1 to 5 mm from both ends in the circumferential direction.

  That is, in FIG. 3, the outer peripheral surface portion 41 a of the inner peripheral side plate portion 41 of the rim clamping portion 43 extends in the tangential direction in the same manner as the outer peripheral surface portion 42 a of the outer peripheral side plate portion 42 of the rim clamping portion 43. However, of the outer peripheral surface portion 41a of the inner peripheral side plate portion 41, the outer peripheral surface portions 410 and 411 at both ends in the circumferential direction have a tapered shape that becomes smaller in diameter toward the outer side in the circumferential direction. The same effect of preventing or reducing the damage can be obtained. In this modification, both end portions in the circumferential direction of the inner peripheral side plate portion 41 are bent radially inward, but the outer peripheral surface portions 410 and 411 at both end portions in the circumferential direction of the inner peripheral side plate portion 41 may be chamfered. However, by bending or curving with a constant plate thickness, the shape given to the inner peripheral side plate portion 41 can be manufactured only by press molding or sheet metal processing, so that the manufacturing process can be simplified.

(Modification 2)
In addition, the arcuate curvature of the inner peripheral side plate portion 41 of the rim clamping portion 43 described in the above embodiment and the bending or circumferential direction of both ends in the circumferential direction of the inner peripheral side plate portion 41 of the rim clamping portion 43 described in the above modification. You may implement simultaneously the chamfering of the outer peripheral surface parts 410 and 411 of both ends.

(Modification 3)
Further, chamfering the pair of corner portions 441 and 442 on the inner peripheral side of the weight fixing portion 44 is very effective in preventing the corner portions from damaging the surface of the wheel portion 22 of the tire wheel 2 when driven. I found out that However, in order to ensure this scratch prevention effect, the chamfering of the corner portions 441 and 442 is the same as the chamfering of the outer peripheral surface portions 410 and 411 at both ends in the circumferential direction of the inner peripheral side plate portion 41 of the rim clamping portion 43 described above. It is preferable to secure the degree. FIG. 4 shows a state in which the pair of corner portions 441 and 442 on the inner peripheral side of the weight fixing portion 44 are chamfered. The radius of curvature of chamfering was set to 0.5 to 5 mm.

  Examples of the material of the clip 4 and the weight 5 are shown below. The clip 4 is formed by punching a steel plate (SK7, SK6, SK5, S60CM, S65CM and their equivalents) into a predetermined shape, then press-forming, bending, and heat-treating. The weight 5 is obtained by cutting steel bars (SS400, S10C and their equivalents) to a predetermined length, bending them, and then subjecting them to cold forging, followed by surface treatment by zinc chromate treatment, dacrozide (registered trademark) treatment, silver powder coating, etc. Has been.

It is an axial direction fragmentary sectional view which shows the balance weight of an Example. It is the front view seen in the axial direction of the balance weight of an Example. It is a partial front view which shows the deformation | transformation aspect of a clip. It is a partial front view which shows the deformation | transformation aspect of a clip. It is a partial front view which shows the shape of the conventional balance weight. It is an axial direction sectional view showing a set state before conventional balance weight driving. It is an axial direction sectional view showing a set state before conventional balance weight driving.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Balance weight 2 Tire wheel 4 Clip 5 Weight 21 Tire wheel rim part 21a Inner peripheral surface of rim part 22 Tire wheel wheel part 41 Inner peripheral side plate part of clip rim clamping part 41a Outer peripheral part of rim clamping part 42 Outer peripheral side plate portion of rim clamping portion 42a Outer peripheral surface portion of rim clamping portion 43 Rim clamping portion 44 Weight fixing portion

Claims (5)

A clip made of a metal plate that is fixed to the rim portion by sandwiching a rim portion that is an outer peripheral edge portion of the tire wheel, and that is positioned on the inner peripheral side of the rim portion of the tire wheel and fixed to the clip. A metal weight,
The clip
A rim sandwiching section having a substantially U-shaped cross section having an inner peripheral side plate part and an outer peripheral side plate part for sandwiching the rim part of the tire wheel;
It has a shape extending from the tip of the inner peripheral side plate portion of the rim clamping portion to the radially inner side of the tire wheel while facing the surface of the wheel portion of the tire wheel extending radially inward from the rim portion. A weight fixing portion fixed to a surface of the tire wheel not facing the wheel portion;
In a balance weight for a tire wheel having
A balance weight for a tire wheel, characterized in that, in the inner peripheral side plate portion of the rim clamping portion, both circumferential end portions are curved radially inward from the circumferential central portion. In the balance weight for a tire wheel according to claim 1,
The inner peripheral side plate portion of the rim clamping portion is curved with a predetermined radius of curvature smaller than the inner diameter of the rim portion of the tire wheel in a plane extending in the radial direction of the tire wheel. Balance weights for tire wheels. A clip made of a metal plate that is fixed to the rim portion by sandwiching a rim portion that is an outer peripheral edge portion of the tire wheel, and that is positioned on the inner peripheral side of the rim portion of the tire wheel and fixed to the clip. A metal weight,
The clip
A rim sandwiching section having a substantially U-shaped cross section having an inner peripheral side plate part and an outer peripheral side plate part for sandwiching the rim part of the tire wheel;
It has a shape extending from the tip of the inner peripheral side plate portion of the rim clamping portion to the radially inner side of the tire wheel while facing the surface of the wheel portion of the tire wheel extending radially inward from the rim portion. A weight fixing portion fixed to a surface of the tire wheel not facing the wheel portion;
In a balance weight for a tire wheel having
Of the inner peripheral side plate portion of the rim clamping portion, the outer peripheral surface portion at both ends in the circumferential direction is a balance weight for a tire wheel whose diameter is smaller than that of the outer peripheral surface portion at the central portion in the circumferential direction. In the balance weight for a tire wheel according to claim 3,
Of the inner peripheral side plate portion of the rim clamping portion, the outer peripheral surface portion at both ends in the circumferential direction is a balance weight for a tire wheel whose diameter is smaller by 0.1 to 2 mm than the outer peripheral surface portion at the central portion in the circumferential direction. . In the balance weight for a tire wheel according to claim 4,
A balance weight for a tire wheel, characterized in that, of the inner peripheral side plate portions of the rim clamping portion, the outer peripheral surface portions at both ends in the circumferential direction having a small diameter have a width of 1 to 5 mm in the circumferential direction.

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