JPH0518731A - Method and apparatus for measuring tire breaker rro - Google Patents

Abstract

PURPOSE:To measure breaker RRO continuously and efficiently by sending ultrasonic wave toward a rotating tire under water and receiving the ultrasonic wave reflected by a breaker of the tire. CONSTITUTION:A tire 13 is installed in a rotary shaft 12 and the tire 13 is rotated on the rotary shaft 12. Ultrasonic wave is sent toward the center of the radial direction of the tire 13 from an ultrasonic wave head 14 under water and the ultrasonic wave reflected from the breaker 16 is received by the supersonic wave head 14. Since the measurement carried out part of the tire 13 is under water, ultrasonic wave becomes easy to go into the tread rubber and breaker RRO can be measured and the measurement is carried out continuously and efficiently by rotating the tire 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a breaker R for a tire.
The present invention relates to an RO measuring method and device.

[0002]

2. Description of the Related Art Techniques for measuring tire RRO and tread gauge using displacement gauges and thickness gauges utilizing ultrasonic waves are
Conventionally, it is publicly known. That is, when measuring the RRO of the tire 2 using the ultrasonic displacement meter 1, conventionally, as shown in FIG. 3, ultrasonic waves are transmitted from the ultrasonic displacement meter 1 toward the radial center of the tire 2. , The ultrasonic wave reflected on the surface of the tread 3 is received by the ultrasonic displacement meter 1, and the distance from the ultrasonic displacement meter 1 to the surface of the tread 3 is obtained to measure the RRO.

When the ultrasonic thickness gauge 4 is used, as shown in FIG. 4, the ultrasonic head 4 is brought into close contact with the surface of the tread 3 of the tire 2 through vaseline or the like, and the wire breaker 5 of the tire 2 is reached. The distance is measured, that is, the tread gauge is measured.

[0004]

In the conventional measuring method using the displacement gauge 1, since the ultrasonic wave is reflected on the surface of the tread 3, the distance to the wire breaker 5 cannot be measured.
Therefore, it is impossible to measure the breaker RRO. On the other hand, in the measuring method using the thickness gauge 4, the breaker RRO
However, since the thickness gauge 4 is brought into contact with the surface of the tread 3 via petrolatum or the like, the tire 2 is rotated around the axis while continuously and efficiently breaking the breaker RR.
There is a drawback that O cannot be measured.

In view of the above point, the present invention has an object to enable the breaker RRO to be continuously and efficiently measured while rotating the tire.

[0006]

A measuring method according to the present invention is a method in which a tire 13 is rotated in water about an axis and ultrasonic waves are directed toward a radial center of the tire 13 by an ultrasonic head 14 in water. And the ultrasonic head 14 receives the ultrasonic waves reflected by the breaker 16 of the tire 13.

The measuring device according to the present invention comprises a water tank 10,
At least the measured portion side of the tire 13 is mounted on the rotating shaft 12 so that the tire 13 is placed in the water of the water tank 10, and the water in the water tank 10 is passed through to the measured portion of the tire 13 toward the center in the radial direction. And an ultrasonic head 14 that emits sound waves and receives the ultrasonic waves reflected from the breaker 16 of the tire 13.

[0008]

In the measurement, the tire 13 is mounted on the rotating shaft 12, at least the measurement site of the tire 13 is put in the water of the water tank 10, and the tire 13 is rotated around the rotating shaft 12. Then, ultrasonic waves are transmitted from the underwater ultrasonic head 14 toward the center side in the radial direction of the tire 13, and ultrasonic waves reflected from the breaker 16 are received by the ultrasonic head 14.

As described above, when the measured portion of the tire 13 is underwater, ultrasonic waves easily enter the tread rubber,
The breaker RRO can be measured. Further, since the tire 13 is measured while rotating, the measurement can be continuously and efficiently performed.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1, 10 is a water tank containing water 11. 12
Is a rotary shaft laterally arranged on the water tank 10, and the tire 13 is detachably attached to the rotary shaft 12 so that about the lower half of the measured portion enters the water 11 of the water tank 10. There is. 14 is an ultrasonic head arranged in the water 11 of the aquarium 10, equipped with a transmitter and a receiver, transmits ultrasonic waves from the transmitter to the tire 13 through the water 11 toward the radial center, The ultrasonic waves reflected by the surfaces of the tread 15 of the tire 13 and the wire breaker 16 are received by the receiver. Reference numeral 17 denotes a control calculation section connected to the ultrasonic head 14, and the ultrasonic head 14 and the control calculation section 17 constitute an ultrasonic displacement meter 18.

In the above structure, the wire breaker R
When measuring RO, attach the tire 13 to the rotating shaft 12,
The tire 13 is rotated around the rotation shaft 12 in the arrow direction.
Then, the ultrasonic wave is emitted from the transmitter of the ultrasonic head 14 toward the center of the tire 13 in the radial direction. Then, the ultrasonic wave is reflected on the surface of the tread 15 of the tire 13 as shown in FIG. 2, and if the reflected ultrasonic wave is received by the receiver, the distance d ₁ from the ultrasonic head 14 to the surface of the tread 15 is measured. it can.

Since the tire 13 is in the water 11, FIG.
As shown in, the ultrasonic wave enters the tread rubber 19 from the surface of the tread 15 and is reflected by the surface of the breaker 16. Therefore, if the ultrasonic wave reflected by the surface of the breaker 16 is received by the receiver, the distance d ₂ from the surface of the tread 15 to the surface of the breaker 16 can be measured. Therefore, if d = d ₁ + d ₂ is obtained, the distance d from the ultrasonic head 14 to the breaker 16
Therefore, the breaker RRO can be continuously and efficiently measured by performing the same measurement over the entire circumference of the tire 13.

The water tank 10 may be sized to accommodate the entire tire 13, and the rotating shaft 12 may be vertically provided.

[0014]

According to the measuring method of the present invention, the tire
13 is rotated in the water about the axis, ultrasonic waves are transmitted toward the radial center of the tire 13 by the ultrasonic head 14 in water, and ultrasonic waves reflected by the breaker 16 of the tire 13 are ultrasonic heads. Because it receives at 14, breaker RR
O can be measured continuously and efficiently.

According to the measuring apparatus of the present invention, the water tank
10, a rotating shaft 12 on which the tire 13 is mounted so that at least the measured portion side of the tire 13 enters the water of the water tank 10, and the water tank 10.
The ultrasonic wave is transmitted toward the center of the tire 13 through the water in the radial direction toward the measured portion and the breaker of the tire 13 is transmitted.
Since the ultrasonic head 14 for receiving the ultrasonic waves reflected from 16 is provided, continuous measurement of the breaker RRO can be easily performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the same main part.

FIG. 3 is an explanatory diagram showing a conventional example.

FIG. 4 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

10 aquarium 11 water 12 rotation axis 13 tires 14 ultrasonic head 16 breakers

Claims (2)

[Claims] 1. A tire (13) is rotated in water about an axis, and ultrasonic waves are transmitted toward the radial center of the tire (13) by an underwater ultrasonic head (14), The ultrasonic wave reflected by the breaker (16) of (13) is transmitted to the ultrasonic head (1
4) Tire breaker RR characterized by receiving in
O measurement method. 2. A water tank (10), a rotating shaft (12) on which the tire (13) is mounted so that at least the measured portion side of the tire (13) enters the water of the water tank (10), and the inside of the water tank (10). After passing the water of the tire (1
An ultrasonic head (14) for transmitting ultrasonic waves toward the center in the radial direction with respect to the measurement site of (3) and receiving ultrasonic waves reflected from the breaker (16) of the tire (13). Tire breaker RRO measuring device characterized by: