JP5830391B2 - Static unbalance measurement method - Google Patents

Description

  The present invention relates to a static unbalance measurement technique using a wheel, a tire, or a wheel as a measurement object.

  It is desirable that the center of mass (center of gravity) of a rotating object such as a wheel coincides with the center of rotation. Since the produced rotating object has some unbalance, the unbalance is measured by a static unbalance measurement technique, and a balance adjustment such as adding a weight (also called a ball weight) is performed.

The unbalance measurement includes dynamic unbalance measurement in which measurement is performed while rotating a rotating object and static unbalance measurement in which measurement is performed without rotating the rotation object. In the present invention, static unbalance measurement is assumed. .
Various techniques have been put into practical use for this static unbalance measurement (see, for example, Patent Document 1 (FIG. 2)).

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a diagram for explaining the principle of a conventional static unbalance measuring device. The static unbalance measuring device 100 is a device for measuring a wheel 101 indicated by an imaginary line, and measures the unbalance of the wheel 101. It comprises an unbalance measuring mechanism 102 and a weighing mechanism 103 that measures the weight (mass) of the wheel 101.

The unbalance measuring mechanism 102 is attached to the upper end of the column 104, a column 104 standing below the center of the wheel 101, a moment meter 105 interposed in the middle of the column 104 for detecting moments around the x axis and the y axis. And a frame body 106 that supports the wheel 101.
On the other hand, the measuring mechanism 103 includes a vertically placed cylinder 107 and a load cell 109 supported by the piston rod 108 of the cylinder 107.

First, the cylinder 107 is extended to lift the wheel 101 upward from the frame body 106. The mass of the wheel 101 can be measured by the load cell 109.
Next, the cylinder 107 is contracted. Then, the wheel 101 is placed on the frame body 106.

  When an unbalance exists, the frame body 106 is tilted as shown in FIG. 10, and as a result, the support column 104 becomes a square shape at the position of the moment meter 105. The moment meter 105 can detect moments about the x-axis and y-axis, and the degree and direction of unbalance can be obtained by this detection.

The moment meter 105 is expensive because it incorporates an element for measuring the moment around the x-axis 111 and an element for measuring the moment around the y-axis 112.
That is, the conventional static unbalance measuring device 100 is inevitably expensive.
In addition, specialized knowledge is required for handling, which hinders its spread.

  However, considering the spread of static unbalance measurement technology, a simpler and cheaper static unbalance measurement device is desired.

Japanese Examined Patent Publication No. 61-29654

The present invention aims to provide a more simple static imbalance measuring methods.

The invention according to claim 1 includes a center pin inserted into the axle hole, a first flange member extending radially from the center pin, and a second flange member extending radially from the center pin and orthogonal to the first flange member. A third flange member extending radially from the center pin and orthogonal to the second flange member; a fourth flange member extending radially from the center pin and orthogonal to the third flange member; and the first flange member A first platform scale on which the distal end of the second cage member is placed and which measures the mass; and a distal end of the third cage member or the fourth platform which is disposed at a position symmetrical to the first platform scale with the center pin as a center. A second platform scale on which the tip of the heel member is placed to measure the mass, and a calculation unit that calculates the unbalance amount and the unbalance position based on the mass measured by the second platform scale and the mass measured by the first platform scale Static unbalance measurement Using the apparatus, the wheel axle hole is opened, to measure the static unbalance of a tire is fitted wheels are tires fitted to the wheel or to the dummy wheel the axle hole are opened A static unbalance measuring method,
A preparation step of placing the tip of the first saddle member on the first platform scale, placing the tip of the third cage member on the second platform scale, and not supporting the second and fourth cage members; ,
A setting step of setting a measurement object on the center pin by fitting the axle hole in the center pin;
In this state, a first information transmission step of sending the mass information measured by the first platform scale and the mass information measured by the second platform scale to the calculation unit,
The tip of the first hook member is removed and the tip of the second hook member is placed on the first platform scale, the tip of the third rod member is removed and the tip of the fourth rod member is placed on the second platform scale. Replacing the first hook member and the third hook member so as not to support;
In this state, a second information transmission step of sending the mass information measured by the first platform scale and the mass information measured by the second platform scale to the calculation unit,
And a calculation step of calculating an unbalance amount and an unbalance position by the calculation unit based on the mass information obtained in the first information transmission step and the mass information obtained in the second information transmission step.

In the invention according to claim 1, the static unbalance measuring device includes one center pin, four gutter members, two platform scales, and one calculation unit. A commercially available personal computer is sufficient for the calculation unit .

In the invention according to claim 1 , the unbalanced magnitude and direction can be determined from the mass information and the length.
Therefore, according to the present invention, a simple static unbalance measuring method is provided.

1 is a plan view of a static unbalance measuring device according to Embodiment 1. FIG. 1 is a front view of a static unbalance measuring device according to Embodiment 1. FIG. It is a figure explaining the setting process concerning the present invention. It is a figure explaining the 1st information transmission process concerning the present invention. It is a figure explaining the 2nd information transmission process concerning the present invention. It is a figure explaining the attachment point of a weight. It is a top view of the static imbalance measuring apparatus which concerns on a reference example . It is a front view of the static imbalance measuring apparatus which concerns on a reference example . It is a figure explaining the principle of the conventional static unbalance measuring apparatus. It is an effect | action figure of the conventional static imbalance measuring apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

First, Embodiment 1 of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the static unbalance measuring device 10 includes a center pin 11 to be inserted into an axle hole (FIG. 3, reference numeral 31), a first flange member 12 extending radially from the center pin 11, and a center pin 11. The second flange member 13 extending radially from the second flange member 13 orthogonal to the first flange member 12, the third flange member 14 extending radially from the center pin 11 and orthogonal to the second flange member 13, and radially extending from the center pin 11. A fourth rod member 15 orthogonal to the third rod member 14, a first platform scale 16 on which the tip of the first rod member 12 or the tip of the second rod member 13 is placed and measures the mass, and the center pin 11 A second platform scale 17 that is placed at a position symmetrical to the first platform scale 16 and on which the tip of the third rod member 14 or the tip of the fourth rod member 15 is placed and measures the mass; and the mass measured by the second platform scale 17 Weighed with the first balance 16 A calculation unit 18 for calculating the amount of imbalance and imbalance location based on the mass, and a display unit 19 for displaying the result of the calculation.

As the first and second platform scales 16 and 17, so-called electronic scales that are commercially available as weight scales can be used. An electronic balance equipped with a terminal capable of extracting mass information to the outside is suitable.
The calculation unit 18 can employ a commercially available personal computer. The display unit 19 can employ a display attached to a commercially available personal computer.

The static unbalance measuring device 10 includes one center pin 11, four saddle members 12 to 15, two table scales 16 and 17, and one calculation unit 18. Commercially available products can be used, and a commercially available personal computer is sufficient for the calculation unit 18 .

Preferably, as shown in FIG. 2, handles 21, 21 are provided on the first heel member 12 and the third heel member 14. The presence or absence of the handles 21, 21 makes it possible to visually distinguish the first flange member 12 and the second flange member 13 (or the third flange member 14 and the fourth flange member 15).
Preferably, the base plate 23 is laid on the floor 22, the upper surface 24 of the base plate 23 is kept horizontal by the liner 25, and the first platform scale 16 and the second platform scale 17 are placed on the upper surface 24 of the base plate 23.

Preferably, convex portions 26 to 29 having pointed ends (lower ends) are provided on the lower surfaces of the distal ends of the first to fourth flange members 12 to 15, and the convex portions 26 to 29 are selectively formed on the first platform scale 16 and the second platform scale. 17 is put. The convex portions 26 to 29 are provided at positions that are symmetric with respect to the center pin 11.
When the first saddle member 12 is placed on the first platform scale 16 and the third collar member 14 is placed on the second platform scale 17, the remaining second and fourth collar members 13 and 15 are floating in the air. That is, the 2nd collar member 13 and the 4th collar member 15 are not supported.

  As shown in FIG. 3, a wheel 32 having an axle hole 31 can be set on the center pin 11. Moreover, the wheel 34 in which the tire 33 is fitted to the wheel 32 can be set. Furthermore, the tire 33 fitted in the dummy wheel 35 in which the axle hole 31 is opened can be set as a measurement target.

  That is, the static unbalance measuring device 10 is a device that can measure the unbalance of the wheel 34, the wheel 32, or the tire 33.

Next, the procedure of static unbalance measurement will be described.
As shown in FIG. 4 (a), the tip (convex portion 26) of the first saddle member 12 is placed on the first platform scale 16, and the tip (convex portion 28) of the third collar member 14 is placed on the second platform scale 17.
Weigh with the first platform scale 16 and the second platform scale 17.
The mass measured by the first platform scale 16 is Wx1, and the mass measured by the second platform scale 17 is Wx2.

As shown in FIG. 4B, if there is a difference between Wx1 and Wx2, the balance center Gx is offset from the center pin 11 by Δx. L0 is the distance from the center pin 11 to the convex portions 26 and 28, which is a known value.
From the balance center Gx, the right moment and the left moment are balanced. From this, Δx can be obtained in the following manner.

As described above, the offset amount Δx along the x-axis can be calculated.
Next, how to obtain the offset amount Δy along the y-axis orthogonal to the x-axis will be described.

In FIG. 4A, the first platform scale 16 and the second platform scale 17 are left as they are, and the first to fourth flange members 12 to 15 are lifted and rotated 90 ° clockwise in the drawing. Then, the first to fourth flange members 12 to 15 are lowered.
Then, as shown in FIG. 5 (a), the tip (convex portion 27) of the second flange member 13 rests on the first platform scale 16, and the tip (convex portion 28) of the fourth flange member 15 rests on the second platform scale 17. Appear.
Weigh with the first platform scale 16 and the second platform scale 17.
The mass measured by the first platform scale 16 is Wy1, and the mass measured by the second platform scale 17 is Wy2.

  As shown in FIG. 5B, if there is a difference between Wy1 and Wy2, the balance center Gy is offset from the center pin 11 by Δy. The moment on the right side and the moment on the left side are balanced from the balance center Gy. From this, Δy can be obtained in the same manner as Δx.

  As described above, the offset amount Δy along the y-axis can be calculated.

Next, how to use the obtained Δx and Δy will be described.
As shown in FIG. 6, an example of correcting unbalance by attaching a weight 36 to the inner periphery of the wheel 32 will be described.
In the xy coordinate system, when the origin is the center pin 11 and the coordinates of the balance center are (Δx, Δy), the azimuth angle θ of the balance center is determined by tan ⁻¹ (Δy / Δx).

  The mass sum (Wx1 + Wx2) acts on the balance center (Δx, Δy). If the weight 36 having the mass Ww is attached to the inner radius L1 of the wheel 32, the mass Ww of the weight 36 can be calculated in the following manner.

In FIG. 6, the unbalance can be corrected by attaching the weight 36 having the obtained mass Ww to the inner periphery of the wheel 32 at the portion of the azimuth angle θ.
Since the calculations described above are simple calculations that can be processed by a calculator (desktop electronic calculator), it goes without saying that a personal computer can be calculated instantaneously.

The above unbalance measurement method can be described in the following steps.
As shown in FIG. 2, the tip of the first rod member 12 is placed on the first platform balance 16, the tip of the third rod member 14 is placed on the second platform scale 17, and the second rod member 13 and the fourth rod member 15 are supported. (Preparation process)
Next, as shown in FIG. 3, the measurement object is set on the center pin 11 by fitting the axle hole 31 to the center pin 11 (setting step).
Next, as shown in FIG. 4, the mass information Wx1 measured by the first platform scale 16 and the mass information Wx2 measured by the second platform scale 17 are sent to the calculation unit (first information transmission step).

Next, as shown in FIG. 5, the front end of the first scissor member 12 is removed, the front end of the second scissor member 13 is replaced with the first platform scale 16, the front end of the third scissor member 14 is removed, and the fourth scissor member is removed. The tip of 15 is replaced with the 2nd platform scale 17, and it is made not to support the 1st collar member 12 and the 3rd collar member 14 (replacement process).
In this state, the mass information Wy1 measured by the first platform scale 16 and the mass information Wy2 measured by the second platform scale 17 are sent to the calculation unit (second information transmission step).

  In the calculation unit 18 shown in FIG. 1, based on the mass information Wx1 and Wx2 obtained in the first information transmission step and the mass information Wy1 and Wy2 obtained in the second information transmission step, the unbalance amount (the above-mentioned unbalance moment, etc.) and The unbalance position (Δx, Δy) is calculated (calculation step).

In the present invention, the unbalanced size and direction can be determined from the mass information and the length.
In the first embodiment, it is necessary to turn the first to fourth saddle members 12 to 90 by 90 degrees manually or by a machine in the replacement process. A reference example capable of omitting such a replacement process will be described below .

A reference example will be described with reference to the drawings.
As shown in FIG. 7, the static unbalance measuring device 10 </ b> B includes a center pin 11 that is inserted into the axle hole, a first flange member 12 that extends radially from the center pin 11, and a first that extends radially from the center pin 11. A second collar member 13 that forms 120 ° in plan view with the collar member 12, a third collar member 14 that extends radially from the center pin 11 and that forms 120 ° in plan view with the second collar member 13, and a first collar member 12, the first balance 16 on which the tip of 12 is placed and measuring the mass W1, the second balance 17 on which the tip of the second saddle member 13 is placed and measuring the mass W2, and the tip of the third saddle member 14 are placed on the weight W3. The third balance 37, the calculation unit 18 for calculating the unbalance amount and the unbalance position based on the masses W1 to W3 measured by the first to third balances 16, 17, and 37, and the calculation results are displayed. And a display unit 19 for displaying.

  Although the explanation of the calculation procedure is omitted, as in the first embodiment, the unbalance position can be easily obtained by the balance and the trigonometric function.

  Preferably, as shown in FIG. 8, a base plate 23 is laid on the floor 22, the upper surface 24 of the base plate 23 is kept horizontal by a liner 25, and the first platform scale 16, the second platform scale 17, and the third platform scale 23 are placed on the upper surface 24 of the base plate 23. A platform scale 37 is placed.

Next, the unbalance measuring method implemented using the static unbalance measuring apparatus 10B described above will be described.
As shown in FIG. 8, the tip of the first saddle member 12 is placed on the first platform scale 16, the tip of the second collar member 13 is placed on the second platform scale 17, and the tip of the third collar member 14 is placed on the third platform scale 37. Place (preparation process).
Next, as shown in FIG. 3, the measurement object is set on the center pin 11 by fitting the axle hole 31 to the center pin 11 (setting step).
As shown in FIG. 7, the mass information W1 measured by the first platform scale 16, the mass information W2 measured by the second platform scale 17, and the mass information W3 measured by the third platform scale 37 are sent to the calculation unit 18 (information Transmission process).
Then, based on the mass information W1 to W3 obtained in the information transmission process, the calculation unit 18 calculates the unbalance amount and the unbalance position (calculation process).

According to this example , the number of steps is small. Therefore, according to the reference example , the static unbalance measurement can be performed in a short time.

  The platform scale may be a mass meter such as a so-called load cell.

  The present invention is suitable for a technique for measuring static unbalance of a wheel or wheel or tire of a motorcycle or a four-wheeled vehicle.

  DESCRIPTION OF SYMBOLS 10, 10B ... Static unbalance measuring device, 11 ... Center pin, 12 ... 1st rod member, 13 ... 2nd rod member, 14 ... 3rd rod member, 15 ... 4th rod member, 16 ... 1st platform scale, 17 2nd scale, 18 ... arithmetic unit, 31 ... axle hole, 32 ... wheel, 33 ... tire, 34 ... wheel, 35 ... dummy wheel, 37 ... 3rd scale.

Claims (1)

A center pin inserted into the axle hole, a first flange member extending radially from the center pin, a second flange member extending radially from the center pin and perpendicular to the first flange member, and extending radially from the center pin And a third flange member orthogonal to the second flange member, a fourth flange member extending radially from the center pin and orthogonal to the third flange member, the tip of the first flange member or the second flange member The first platform scale on which the tip of the third platform is mounted and the mass of the first platform scale or the fourth kite member are mounted on the center pin at a position symmetrical to the first platform scale. A static unbalance measuring device comprising a second platform scale that measures the unbalance amount and an unbalanced position based on the mass measured by the second platform scale and the mass measured by the first platform scale is used. The car Wheels that are perforated, a static unbalance measuring method for measuring the static unbalance of a tire is fitted wheels are tires fitted to the wheel or to the dummy wheel the axle hole are opened And
A preparation step of placing the tip of the first saddle member on the first platform scale, placing the tip of the third cage member on the second platform scale, and not supporting the second and fourth cage members; ,
A setting step of setting a measurement object on the center pin by fitting the axle hole in the center pin;
In this state, a first information transmission step of sending the mass information measured by the first platform scale and the mass information measured by the second platform scale to the calculation unit,
The tip of the first hook member is removed and the tip of the second hook member is placed on the first platform scale, the tip of the third rod member is removed and the tip of the fourth rod member is placed on the second platform scale. Replacing the first hook member and the third hook member so as not to support;
In this state, a second information transmission step of sending the mass information measured by the first platform scale and the mass information measured by the second platform scale to the calculation unit,
And a calculation step in which the calculation unit calculates an unbalance amount and an unbalance position based on the mass information obtained in the first information transmission step and the mass information obtained in the second information transmission step. Unbalance measurement method.

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