JPH11258096A - Unbalance correcting method for tire-wheel combination body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unbalance correcting method for a tire-wheel combination body capable of reducing a balance weight used in static unbalance correction. SOLUTION: A static unbalance (c) of a wheel measured by a balancer is composed of a component (b) by un-uniformity of a member in a wheel 10 and a component (a) by eccentricity. Accordingly, the static unbalance (a) caused by eccentricity is increased by installation of a tire. Therefore, the increased static unbalance is calculated, and the calculated static unbalance and the static unbalance caused by un-uniformity of the member are synthesized to calculate the static unbalance caused by the wheel 10. A tire is installed on the wheel in such a manner that the static unbalance caused by the wheel 10 and un- uniform static unbalance caused by the member of the tire 12 are of opposite phase, whereby the static unbalance is minimized and the number of balance weight (lead) used can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for correcting imbalance in a tire / wheel combination.

[0002]

2. Description of the Related Art Conventionally, static imbalance of a tire / wheel combination has been measured, and a balance weight is attached to a rim flange portion of a wheel based on the measurement result to correct the static imbalance. Have been done.
At this time, the static imbalance of the tire and the wheel is measured by a balancer, and the tire is mounted on the wheel by inverting 180 degrees (out of phase) so as to cancel out the static imbalance of both. In this way, by adjusting the circumferential position (phase) at which the tire is mounted on the wheel, the static imbalance of the tire / wheel combination is minimized, and the amount of balance weight used for imbalance correction is reduced. We are trying to reduce it.

Specifically, the following method is employed. (1) Method used when tires and wheels cannot be selected from a plurality of candidates, such as at a tire store. Marking indicating the phase of static imbalance is performed on the side surface of the tire. Then, marking is performed on the wheel to indicate the phase in which the mounting hole is eccentric with respect to the center. By combining the tire and the wheel by matching the two markings (phases), it is possible to minimize the static imbalance in performing the balance correction, thereby reducing the amount of the balance weight used.

(2) A method performed on a rim assembling line in which a large number of tires and wheels to be mounted on a new vehicle are assembled into a rim, and a static unbalance amount of a plurality of tires and a static unbalance amount of a plurality of wheels are set. Is stored as a database, and those having close static imbalance amounts are combined and canceled out of each other, thereby minimizing the total amount of the balance weight used for correcting the static imbalance in the tire / wheel combination.

[0005] For example, the static imbalance of 100 tires is measured and arranged in ascending order of the static imbalance amount.
The wheel also measures 100 static imbalance amounts and arranges them in ascending order of static imbalance. Then, tires and wheels are combined in a phase (opposite phase) that cancels out the static imbalance in order from the one with the smallest static imbalance.

[0006]

In recent years, one of the environmental problems raised worldwide has been the reduction of lead. Conventionally, a balance weight used for correcting imbalance of a tire / wheel combination body is formed of lead. Therefore, reducing the amount of use of the balance weight has been a major issue for tire manufacturers.

In order to reduce the amount of the balance weight (lead) used, it is conceivable to reduce the amount of static imbalance generated in the tires and wheels, that is, to improve the manufacturing accuracy of the tires and wheels. There are problems such as investment and technological development, and it is difficult to respond immediately.

[0008] Accordingly, the present invention has been focused on reducing the amount of balance weight, that is, the amount of static imbalance of the tire / wheel combination, by further improving the conventional imbalance correction method.

From this point of view, the unbalance correction method shown in the conventional method (2) has room for reducing static imbalance. For example, there is a problem that the static imbalance amount does not become 0 even when a wheel and a tire having a static imbalance amount of 0 are combined.

The following two reasons can be considered for this reason. (A) Fit between tire and wheel (combination state)
Are uneven on the circumference.

(B) Even if the static imbalance amount of the wheel is apparently zero, it is due to the static imbalance caused by unevenness of the members constituting the wheel and the processing deviation (eccentricity) of the wheel mounting hole. It is highly possible that the resulting static imbalance happens to be canceled out. In this case, a new static imbalance is generated by adding a heavy object such as a tire to the eccentric wheel.

The reason for (b) will be described in detail below. Assuming that the cause of the imbalance in the wheel is caused by eccentricity and non-uniformity of the members, the unbalance (balance) model of the wheel can be considered as shown in FIGS.

FIG. 7 (A): A case where there is no eccentricity in the wheel and there is no unevenness of the members in the wheel FIG. 7 (B): A case where there is eccentricity in the wheel and there is no unevenness of the members in the wheel C): When the wheel has no eccentricity and the wheel has non-uniform members. FIG. 7 (D): When the wheel has eccentricity and the wheel has non-uniform members. However, FIG. 7 (A) is ideal. It can be said that there is no realistic balance state of the wheel. It is also difficult to imagine a wheel in which the members are formed completely uniformly in the circumferential direction as shown in FIG.

FIG. 7C shows a static unbalance model of the wheel 10 in the conventional method (2). That is,
The tire is mounted on the wheel such that the static imbalance of the measured wheel 10 is regarded as only the static imbalance due to the non-uniformity of the members, and the static imbalance of the tire has an opposite phase.

However, the actual wheel 10 has
An eccentricity occurs in which the mounting hole is deviated from the physical (shape) center of the wheel, and the model in FIG. 7D is closest to reality.

That is, the conventional method (2) does not consider that the component due to eccentricity (static imbalance) among the measured static imbalances increases due to tire mounting. As a result, the static imbalance of the tire / wheel combination could not be minimized.

Further, even if the static imbalance of tires and wheels is managed on a per lot basis, a tire / wheel combination pair that minimizes the total balance weight usage is not obtained. As a result, there is a problem that the amount of lead (balance weight) required for correcting the static imbalance cannot be minimized.

In view of the above, it is an object of the present invention to provide a method for correcting an imbalance of a tire / wheel combination that reduces the amount of a balance weight used for correcting a static imbalance.

[0019]

According to the first aspect of the present invention, there is provided a method for correcting an imbalance of a tire / wheel combination, which corrects a static imbalance of a tire / wheel combination, the method comprising: When the tire is assembled to the wheel, the static imbalance caused by the non-uniformity of the wheel components and the static imbalance caused by the non-uniformity of the tire components are determined. It is characterized in that the static imbalance of the combination is corrected to a target value.

The operation of the first aspect of the present invention will be described. Since the static imbalance caused by the eccentricity of the wheel is obtained as described above, the tire can be mounted on the wheel in consideration of the static imbalance caused by the eccentricity. As a result, the static imbalance amount of the tire / wheel combination can be reduced to the target value.

According to a second aspect of the present invention, in the first aspect of the present invention, the static imbalance of the tire / wheel combination is corrected to a target value by using at least the following parameters. Tire parameters: (1) Tire weight (2) Static unbalance amount of a single tire (3) Circumferential position of static unbalance of a single tire Wheel-related parameters: (4) Wheel weight (5) (6) Circumferential position of static imbalance of the wheel (7) Amount of eccentricity of wheel (8) Circumferential position of wheel eccentricity The operation of the invention described in claim 2 will be described. I do.

With such parameters, the static imbalance due to the eccentricity of the wheel and the static imbalance due to the eccentricity of the members of the wheel can be calculated. For example, the static imbalance due to the eccentricity of the wheel can be obtained from the amount of eccentricity of the wheel, the circumferential position of the eccentricity of the wheel, and the weight of the wheel. The static imbalance due to non-uniformity of the wheel members is obtained by subtracting the static imbalance due to eccentricity from the wheel imbalance in a vector manner. Further, the static imbalance caused by the eccentricity of the wheel, which is increased by mounting the tire, is obtained by (static imbalance due to the eccentricity) × (the weight of the tire + the weight of the wheel) / (the weight of the wheel). be able to.

Therefore, the static imbalance of the tire / wheel combination can be corrected to the target value.

According to a third aspect of the present invention, in the first or second aspect, the static imbalance amount caused by the wheel is compared with the static imbalance amount of the tire.
A pair of tires and wheels is determined so that the sum of static unbalance amounts in a plurality of tire / wheel combinations is minimized.

The operation of the invention will be described. As a result, when there are a plurality of tires and wheels, the sum of the static imbalance of the tire / wheel combination pairs can be minimized, and thus the amount of the balance weight (lead) used for the plurality of tire / wheel combinations is used. Can be reduced.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION A tire according to an embodiment of the present invention
The method of correcting imbalance of the wheel combination will be described with reference to the schematic diagrams of FIGS.

First, the wheel 10 is statically unbalanced by a balancer (vector: unbalance amount + phase).
Is measured, a static imbalance c is detected as shown in FIG. Similarly, the static imbalance d of the tire 12 is detected as shown in FIG.

The weights of the wheel 10 and the tire 12 may be measured once, but the same values may be used if they have the same specifications. Also, the amount of eccentricity from the mounting hole of the wheel 10 to the center is measured.

Wheel 1 measured by balancer
The static imbalance c of 0 is a static imbalance a caused by a deviation (eccentricity) between the center (shape center) F of the wheel 10 and the mounting hole H and a static imbalance caused by unevenness of members in the wheel 10. And a balance b (see FIG. 1).

Here, the static imbalance a due to the eccentricity of the wheel 10 is composed of the direction of the imbalance (position in the circumferential direction) and the magnitude of the imbalance (the amount of imbalance).
This imbalance amount is (eccentricity amount) x (wheel weight)
Therefore, it can be easily calculated by calculation. Therefore, the static imbalance b is changed to (static imbalance c
Can be determined by static imbalance a).
In this way, the measured static imbalance c can be decomposed into a static imbalance a due to eccentricity and a static imbalance b due to unevenness of the members.

Next, a static imbalance a 'due to the eccentricity of the wheel 10 generated when the tire 12 is mounted (tire / wheel combination) is determined.

This is because the mounting of the tire 12 on the wheel 10 increases the static imbalance a generated due to the eccentricity. That is, the size of the static imbalance a due to the eccentricity of the wheel (the amount of imbalance)
Is (eccentricity) x (wheel weight), so when the tire is mounted on the wheel, the magnitude of the static imbalance a 'of (eccentricity) x (wheel weight + tire weight) (The amount of imbalance) (see FIG. 2).

This static imbalance a ′ is (static imbalance a) × (weight of tire + weight of wheel) /
(Wheel weight).

Further, the static imbalance a 'due to the eccentricity of the wheel 10 of the tire / wheel combination and the static imbalance b due to the unevenness of the members of the wheel 10
To obtain the static imbalance c ′ caused by the wheel 10.

The circumferential angle (phase) of the static imbalance c 'thus obtained and the static imbalance d due to the unevenness of the members of the tire 12 are made to differ by 180 degrees (opposite phase). 12 is mounted on the wheel 10 (see FIG. 3). This cancels out the static imbalance c ′ due to the wheel 10 and the static imbalance d due to the tire 12, minimizing the static imbalance of the tire-wheel combination. A balance weight is mounted on the wheel 10 corresponding to the static imbalance. Therefore, the balance weight usage is minimized, and the lead usage can also be minimized.

When a plurality of tires and wheels are combined, the static imbalance d of each tire is
And the static imbalance c ′ caused by the wheels 10 are determined, and a tire-wheel combination pair is determined so that the sum of the static imbalance amounts of the respective tire-wheel combinations becomes minimum. This reduces the total static imbalance of multiple tire / wheel combinations, rather than a single tire / wheel combination, and reduces the total balance weight (lead) used to correct the imbalance. Can be reduced.

An example showing the operation of the static imbalance correcting method for the tire / wheel combination will be described below.

FIG. 4A shows the static imbalance d due to the unevenness of the members of the tire 12. FIG. 4B shows the static imbalance a due to the eccentricity of the wheel 10 and the static imbalance b due to the unevenness of the members of the wheel 10. FIG.
(C) shows a combination of the static imbalance a and the static imbalance b, and shows the static imbalance c of the wheel 10 measured by the balancer.

Here, the weight of each of the tire 12 and the wheel 10 is set to 1. The magnitudes of the static imbalances a to d (static imbalance amounts) are respectively a = 2, b = 3,
It is assumed that c (= ba) = 1 and d = 1.

In the case of this example, the static imbalance a '=
Static imbalance a × (tire weight + wheel weight) / wheel weight = 2 × (1 + 1) / 1 = 4.

Since the static imbalance c 'is a combination of the static imbalance a' and the static imbalance b, which are in opposite phases, the static imbalance c '= 4-3 = 1.

On the other hand, since the static imbalance d = 1, both static imbalances are canceled out, that is, the static imbalance c ′ caused by the eccentricity of the wheel 10 and the member of the tire 12 The static imbalance of the tire / wheel combination can be minimized (in this example, 0) by making the phase of the static imbalance d due to the non-uniformity opposite to that of the static imbalance d.

On the other hand, as in the conventional method (2), the tire is mounted such that the static imbalance c detected by the balancer of the wheel 10 and the static imbalance d due to the unevenness of the members of the tire 12 have opposite phases. When mounted on a wheel, the static imbalance c and the static imbalance c 'are in opposite phase and the imbalance amount is equal, so the remaining static imbalance is as follows.

Static imbalance d-Static imbalance c
= Static unbalance d − (− static unbalance c ′) =
Static imbalance d + Static imbalance c ′ = 1 + 1 =
2 and a static imbalance of size 2 remains.

As described above, by adding the weight of the tire to the static imbalance due to the eccentricity of the wheel,
Static imbalance remaining when the tire is mounted on the wheel can be reduced, and the amount of balance weight used can be reduced. As a result, the amount of lead used can be reduced.

[0046]

According to the first aspect of the present invention, since the weight of the tire is added to the static imbalance due to the eccentricity of the wheel, the circumferential position at which the tire is mounted on the wheel can be corrected. The static imbalance of the tire / wheel combination can be reduced to the target value. As a result,
The amount of balance weight using lead is reduced.

According to the second aspect of the present invention, since the above-mentioned configuration is adopted in the first aspect, the static imbalance due to the eccentricity of the wheel can be easily obtained and corrected, and the tire / wheel combination body can be obtained. Static imbalance can be reduced.

According to the third aspect of the present invention, since the above-described configuration is employed in the first or second aspect, the sum of the unbalance amounts of the plurality of tire / wheel combinations is minimized, and the balance weight used is used. The amount of (lead) is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an unbalanced state of a wheel according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an unbalanced state in an ideal tire mounting wheel according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram of an unbalanced state of the tire / wheel combination body according to the embodiment of the present invention.

FIG. 4A is an explanatory diagram of an unbalanced state of a tire, FIG. 4B is an exploded view of a static imbalance of a wheel, and FIG. 4C is an explanatory diagram of a static imbalance of a wheel.

FIG. 5 is an explanatory diagram of an unbalance correction method according to the embodiment of the present invention.

FIG. 6 is an explanatory view of an unbalance correction method according to a conventional example.

FIGS. 7A to 7D are explanatory diagrams of an unbalanced state of a wheel.

[Explanation of symbols]

 10 wheels 12 tires

Claims (3)

[Claims] 1. A method for correcting an imbalance of a tire / wheel combination, which corrects a static imbalance of a tire / wheel combination, comprising: a static imbalance caused by eccentricity of a wheel; Obtain the static imbalance caused by the uniformity and the static imbalance caused by the unevenness of the tire components, and correct the static imbalance of the tire / wheel combination to a target value when the tire is assembled to the wheel. A method for correcting imbalance of a tire / wheel combination body, characterized in that: 2. The method for correcting imbalance of a tire / wheel combination according to claim 1, wherein the static imbalance of the tire / wheel combination is corrected to a target value by using at least the following parameters. . Tire parameters: (1) Tire weight (2) Static unbalance amount of a single tire (3) Circumferential position of static unbalance of a single tire Wheel-related parameters: (4) Wheel weight (5) (6) Circumferential position of wheel static imbalance (7) Wheel eccentricity (8) Circumferential position of wheel eccentricity 3. The tire according to claim 1, wherein the amount of static imbalance caused by the wheel is compared with the amount of static unbalance of the tire so that the sum of the amount of static imbalance in a plurality of tire / wheel combinations is minimized. 3. The method for correcting imbalance of a tire / wheel combination according to claim 1, wherein a pair is determined by combining the wheel and the wheel.