JPH0618352A - Measuring method for type uniformity and its device - Google Patents

Abstract

PURPOSE:To obtain a measuring method for tyre uniformity and its device simply and accurately measuring TFV in tyre production line and drastically improving work efficiency and productivity. CONSTITUTION:To a center hollow main shaft 3 provided with an upper rim 2a and a lower rim 2b chucking a measured type W, a tyre dynamic balance measuring machine 1 provided with two load cells 4a and 4b are provided. On the side of this tyre dynamic balance measuring machine 1, a load drum device 5 provided with a load drum 6 capable of rotating at a high speed and coming into contact with and separating from the measured tyre W is provided. To the two load cells 4a and 4b, a comparison arithmetic device 17 which measures the fluctuating force in the tangential direction of the type W by subtracting the fluctuation force due to centrifugal force of the measured tyre W from the synthetic force of the fluctuation force due to centrifugal force of the measured tyre W and the fluctuating force in the tangential direction of the tyre. Thus, it is so constituted that TFV of the measured tyre W is easily measured in a tyre production line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire uniformity measuring method and apparatus, and more particularly, to measuring a tangential force variation of a tire (hereinafter referred to as TFV) in a tire manufacturing line. The present invention relates to a tire uniformity measuring method and apparatus.

[0002]

2. Description of the Related Art Generally, as a method for measuring the uniformity of tires (uniformity on the circumference of a tire) that affects the vibration, riding comfort and noise of automobiles, especially passenger cars, for example, the deflection of the outer circumference of the tire is measured. Run ou
t), a certain load determined by the size is applied to the rim-assembled tire and pressed against the rotating drum, the distance between the tire shaft and the drum shaft is fixed, the tire shaft is rotated, and the reaction is applied to the drum shaft. Force variation for measuring force is known. For this force variation, variation in force in the tire width direction (radial force variation, hereinafter referred to as RFV) and tire radial direction are known. There are three types of fluctuations in force (lateral force variation, hereinafter referred to as LFV) and fluctuations in force in the tangential direction of the tire (tractive force variation, hereinafter referred to as TFV).

The force variation is measured by RFV and LFV using a uniformity machine installed on the tire manufacturing line, and TFV is measured by a laboratory machine installed on the spindle on which the tire is mounted. Was independently measured by.
Further, in the past, the variation of the force in the tangential direction of the tire (TF
V) has been thought to have less effect on tire vibration and the like than other RFVs and LFVs, but with the recent improvement in the performance of passenger cars, TFV also has an effect on vehicle vibrations. The measurement of TFV has been emphasized in the measurement of tire uniformity.

By the way, the TFV is measured by a dedicated laboratory machine other than the uniformity machine as described above, which is measured by RFV or LFV.
It is difficult to measure with a uniformity machine that rotates at low speed like conventional RFV and LFV because it is necessary to measure by rotating the tire at high speed in comparison with, and therefore, a dedicated TFV machine is used. It is necessary.

[0005]

[Problems to be Solved by the Invention] However, TFV
It is possible to install a dedicated machine of
There is a problem that it is not possible to improve the productivity of tires and it takes a lot of time and effort. Also, when measuring TFV independently with a conventional laboratory machine, a weight may be attached to the tire rim. However, there is a problem that it is necessary to correct the imbalance, labor is required for the measurement work, and workability and productivity cannot be improved.

The present invention has been devised by focusing on such a conventional problem, and has been proposed in a tire manufacturing line.
It is an object of the present invention to provide a tire uniformity measuring method and apparatus capable of performing the measurement of the tire easily and accurately and significantly improving the workability and the productivity.

[0007]

In order to achieve the above object, the present invention provides a tire dynamic balance measuring machine in which two load cells are provided on a main shaft having an upper rim and a lower rim for chucking a measuring tire, On the side part of this tire dynamic balance measuring machine, a load drum device provided with a load drum capable of rotating at high speed on the measurement tire so that the tangential direction coincides with the detection direction of the load cell is provided so that the load drum can contact and separate, and A comparison calculation to measure the tangential force of the tire by subtracting the variable force of the centrifugal force of the measured tire from the combined force of the variable force of the measured tire centrifugal force and the tangential force of the tire in the load cell. The gist is that the device is connected.

[0008]

The present invention is configured as described above, and sets the measurement tire on the upper rim and the lower rim provided on the rotatable main shaft of the tire dynamic balance measuring machine,
The load drum rotating at a high speed is pressed against this measuring tire to rotate the measuring tire, and due to the two load cells attached to the spindle along with the rotation of the measuring tire, the fluctuation force due to the centrifugal force of the measuring tire and the tangent line of the tire Detecting the combined force with the fluctuating force in the direction, outputting the resultant force to the comparison calculation device, then separating the load drum from the measurement tire,
Detect the fluctuation force due to the centrifugal force of the measurement tire at that time,
The fluctuating force is output to the comparison calculation device, and the comparison calculation device
By measuring the tangential variation force of the tire by subtracting the variation force of the measurement tire centrifugal force from the combined force of the variation force of the measurement tire centrifugal force and the tire tangential direction variation force, On the production line of
V can be measured easily and accurately.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall perspective view of a TFV measuring device in a tire manufacturing line embodying the present invention, FIG. 2 is a sectional view of a tire dynamic balance measuring machine, and 1 is for chucking a measuring tire W. A tire dynamic balance measuring machine 5, in which two load cells 4a, 4b are provided on a hollow main shaft 3 having a rim 2a and a lower rim 2b, has a measuring tire W on a side portion of the tire dynamic balance measuring machine 1. Further, the load drum device is provided with a load drum 6 capable of rotating at high speed so as to come into contact with and separate from the load drum.

In the tire dynamic balance measuring machine 1, as shown in FIG. 2, the lower rim 2b is connected and supported to the main shaft 3 via a hollow casing 7, and the upper rim 2 is
A rim shaft 8 is suspended on a. The upper rim 2a
Is movably supported by a not-shown elevating means (for example, a cylinder), and a locking member 10 having a multi-stepped locking groove 9a is integrally formed at the tip of the rim shaft 8. There is. A chuck 11 having a substantially L-shaped cross section, which is swingably supported by the casing 7 via a pin (not shown), is configured to engage with and disengage from the engaging groove 9a of the engaging member 10.

The operating means 12 for opening and closing the chuck 11 includes a rod 13 slidably inserted in the hollow main shaft 3 and a locking member 14 attached to the tip of the rod 13. Further, it is configured with a drive device (not shown) that slides the rod 13 in the vertical direction. In the upper and lower portions of the outer circumference of the main shaft 3, the horizontal deflection of the main shaft 3,
The above-mentioned two load cells 4a for detecting the shake in the vertical direction,
4b is attached, the two load cells 4a, 4b and the main shaft 3 are connected to each other via pins 15a, 15b, and the load cells 4a, 4b are fixed to the mount 16 at their base ends. Further, the two load cells 4a and 4b have, as will be described later, a fluctuation force due to the centrifugal force of the measurement tire W,
The TFV of the measured tire W is connected to the comparison calculation device 17 for measuring the tangential variation force of the tire W by subtracting the variation force of the measurement tire W due to the centrifugal force from the resultant force combined with the tangential variation force of the tire. Is configured to be easily measured on the tire manufacturing line.

Further, the load drum device 5 is provided with a frame 18 having a U-shaped cross section, which can be moved toward and away from the tire dynamic balance measuring machine 1, on the side of the tire dynamic balance measuring machine 1. 18, a load drum 6 capable of rotating at high speed via a drive shaft 19
Is installed. The drive shaft 19 is a frame 18
A pulley 20 is attached to a tip end portion 19a protruding from the upper surface of the pulley 20, and the pulley 20 and a pulley 22 attached to a shaft 21a of a drive motor 21 attached to an end surface of the frame 18.
And are connected via a belt 23. The drive motor 21 has an output capable of rotating the load drum 6 at 400 rpm to 500 rpm.

When measuring the TFV, the load drum 6 is pressed against the measuring tire W to rotate the measuring tire W, and the fluctuation force due to the centrifugal force of the measuring tire W at this time is detected by the load cells 4a and 4b. Then, it is measured. Next, a method of measuring TFV in a tire manufacturing line will be described. First, the measurement tire W is set on the upper rim 2a and the lower rim 2b of the tire dynamic balance measuring machine 1, and the measurement tire W is in an inflated state. On the other hand, the drive motor 21 causes the load drum 6 to move at a predetermined speed. Rotate with.

In this state, the load drum 6 rotating at high speed is pressed against the measuring tire W to rotate the measuring tire W, and the two load cells 4a and 4b attached to the main shaft 3 as the measuring tire W rotates. The combined force of the fluctuating force of the measurement tire W due to the centrifugal force and the fluctuating force of the tire in the tangential direction is detected, and the resultant force is output to the comparison calculation device 17. Next, the load drum 6 is separated from the measurement tire W via the frame 18, and the fluctuation force due to the centrifugal force of the measurement tire W at that time is detected from the two load cells 4a and 4b U, and the fluctuation force is compared and calculated by the comparison calculation device 17 Output to.

Thereafter, the comparison operation device 17 subtracts the fluctuating force of the measuring tire W from the combined force of the fluctuating force of the measuring tire W and the fluctuating force of the tire W in the tangential direction. Thus, the tangential fluctuation force of the measurement tire W, that is, TFV is measured. In the tire manufacturing line, T
FV can be measured easily and accurately,
It is possible to easily perform the measurement without individually using a dedicated TFV machine which has been deviated from the production line as in the conventional case.

[0016]

According to the present invention, since the TFV of the measuring tire is measured by the above method, the TFV can be measured easily and accurately in the tire manufacturing line, and the workability and the productivity can be improved. The effect is that it can be significantly improved.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a TFV measuring device in a tire manufacturing line embodying the present invention.

FIG. 2 is a sectional view of a tire dynamic balance measuring machine embodying the present invention.

[Explanation of symbols]

1 Tire dynamic balance measuring machine 2a Upper rim 2b Lower rim 3
Spindle 4a, 4b Load cell 5 Load drum device 6 Load drum W Measuring tire 17 Comparison calculation device

Claims (2)

[Claims] 1. A measuring tire is set on an upper rim and a lower rim provided on a rotatable main shaft of a tire dynamic balance measuring machine, and a measuring drum is pressed against a load drum rotating at a high speed. Two load cells that are rotated and attached to the main shaft as the measurement tire rotates detect the combined force of the centrifugal force of the measurement tire and the tangential variation force of the tire, and compare the resulting forces. Output to the arithmetic unit, then, the load drum is separated from the measurement tire, the fluctuation force due to the centrifugal force of the measurement tire at that time is detected, and the fluctuation force is output to the comparison calculation unit. The tangential variation force of the tire is calculated by subtracting the variation force of the measurement tire centrifugal force from the combined force of the variation force of the measurement tire centrifugal force and the tangential direction variation force of the tire. A method for measuring tire uniformity, which comprises measuring. 2. A tire dynamic balance measuring machine in which two load cells are provided on a main shaft having an upper rim for chucking a measuring tire and a lower rim, and a tangential direction is provided on a side portion of the tire dynamic balance measuring machine. A load drum device provided with a load drum capable of high-speed rotation in contact with and separated from a measurement tire so as to match the detection direction of the load cell is installed, and the two load cells have a variation force due to a centrifugal force of a measurement tire and a tire. A tire uniformity measuring device, characterized in that a comparative arithmetic unit for measuring the tangential variation force of the tire is connected by subtracting the variation force due to the centrifugal force of the measured tire from the resultant force combined with the tangential variation force of .