JPS6133547Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an excellent tire testing machine for production lines.

Conventional tire testing machines include drum-type tire testing machines for laboratory use, and tire balancers for laboratory use and service stands. The former measures the force and force couple generated on the rotating tire, and the latter measures the balance of the tire and corrects it. As recent trends have led to demands for higher tire quality, it has become desirable to measure the measurement items using the tire testing machines and the like on the tire production line. Particular emphasis is placed on the dynamic characteristics of the tire in this measurement, and therefore a testing machine with good responsiveness and workability is required. Previously, as a tire uniformity machine, the Special Publication 1977-7562
There are those disclosed in Japanese Patent Publication No. 50-6922. This allows a tire uniformity test to be performed by pressing a road wheel with a load cell into contact with the tire being held between the upper and lower rims with the axis vertical. This is because load cells are attached to both ends of the shaft of the road wheel, and the shaft on the tire side is rotationally driven, so that measurement accuracy is not easily affected by the rotational drive section. However, since load cells are provided at both ends of the shaft of the load roller, measurement accuracy is adversely affected by differences in the characteristics of individual load cells and differences in mounting conditions. Furthermore, since the road roller has a large mass, it has a slow response to changes in the load received from the tire side, which also has a negative effect on measurement accuracy. Since this machine cannot measure the dynamic balance and weight of tires, there is a problem of low productivity. This problem is not limited to this machine, and has not been solved with conventional tire testing machines.

Separately, in a tire testing machine,
As disclosed in Japanese Patent Laid-open No. 77501, there is a structure in which a drum is rotationally driven and a load cell is provided on the tire side. Some have a multi-force load cell installed on the shaft. It is conceivable to apply these techniques to the conventional uniformity machine to solve the accuracy problems caused by providing a load cell on the load roller side. However, the configuration for injecting air into the tire to be measured is well-known as the configuration of the Uniformity Machine mentioned above, but according to this, the lower rim device is connected to the upper rim device provided on the machine frame from the lower fixed part. Since the tire is held between the tires while being pressed upward, the pressing force of the lower rim device must be large enough to overcome the air pressure when the tire is filled with air.
Bearings and other structures must be able to withstand heavy loads, and this is the case. Since the force exerted on the upper and lower rim devices due to air pressure is quite large, the ratio between the amount to be measured and the load capacity becomes too large, so a load cell for multi-force detection is installed on the shaft of the tire. It is almost impossible to incorporate it in terms of accuracy, and even if it were incorporated, it would not be possible to measure with high precision, and it would not be possible to measure tire weight.

This idea was developed from the viewpoint of improving the accuracy of conventional uniformity machines by installing a load cell for multi-force detection on the support shaft of the tire to be measured, so that the structure of the upper and lower rim devices does not adversely affect the measurement. By doing so, we would like to provide a tire testing machine that enables uniformity testing to be performed with high precision and also enables dynamic balance and weight measurements to be performed in the same measurement process as uniformity testing in order to improve productivity. That is.

The technical means of this invention is that the bead part of a tire whose center axis of rotation is vertical is supported by sandwiching it from above and below, air can be injected into the tire, and the tire is divided into upper and lower parts, so that the above-mentioned support state is mutually supported. An upper and lower rim device having a lock portion locked therebetween, a vertical shaft rotatably supporting the lower rim device at the upper end, and a fixed base that supports the vertical shaft and the shaft. a six-component force detection load cell capable of detecting component forces in axial directions perpendicular to each other including the central axis of the vertical axis and moments around the three axes; an upper rim attachment/detachment device that is provided to allow the upper rim device to be attached to and removed from the device and to be detached from the upper rim device in the attached state; The present invention is characterized by comprising a tire rotation drive drum which is moved together with the stand by a feeding device and is mounted on and separated from the tire sandwiched by the upper and lower rim devices.

According to this technical means, the tire to be measured is placed on the lower rim device, the upper rim device is lowered by the upper rim device attachment/detachment device, the tire is supported by being attached to the lower rim device, and the supported state is locked. The tire is locked at the rim, the tire is filled with air, and the attachment/detachment device is detached from the upper rim device to enable measurement. The force and moment are detected by a six-component force detection load cell. Thereafter, the rotary drive drum is separated from the tire, and while the tire is rotating, the dynamic balance can be measured using a load cell for detecting six component forces, and the weight can be measured while the tire is rotating or after it has stopped.

In a state where the upper and lower rim devices support the tire, the attachment and detachment device of the upper rim device is completely detached, and the upper rim device is coupled to the lower rim device to be locked and integrated. In this state, no external force is acting on the six-component force detection load cell.
The force exerted by the internal air pressure of the tire is balanced between the upper rim device and the lower rim device because they are connected, and therefore does not act as an external force on the six-component force detection load cell.

A load cell for detecting a six-component force is installed between the vertical shaft supporting the lower rim device and the fixed base, and the tire is driven from the drum side that circumscribes this, so the mass is smaller than the drum side. Since the tire side with a smaller value responds relatively sensitively to changes in the applied force, the detection accuracy of the six-component force detection load cell is improved compared to when it is provided on the drum side.

Examples of this invention will be described below. In the figure, 1 is a multi-force detection load cell that can detect six component forces formed in a single body.
This is the same force measuring device as No. 51-73528 (Japanese Patent Application Laid-open No. 52-15581). Its general structure is that a measuring element 4 is provided between an outer cylinder 2 and an inner shaft part 3, so that when the outer cylinder 2 is fixed, six components of force acting on the inner shaft part 3 can be measured simultaneously. It's getting old. This load cell 1 has an outer cylinder 2 fixed to a base 5 so that its center axis is vertical. A rim device 6 is attached to a vertical inner shaft portion 3 (hereinafter referred to as vertical shaft 3).

The rim device 6 consists of an upper part and a lower part, and the lower rim device 6a is rotatably supported on the upper extension of the vertical shaft 3. 7 is a ball bearing, 8 is a casing part of the bearing, 9 is a lower rim, 10
1 is a cylindrical portion, and 11 is an upper rim engaging portion, which, except for the ball bearing 7, are integrally formed in the shape of a stepped wheel. The upper rim device 6b includes an upper rim 12,
It consists of a lower rim engaging part 13, a pressurized part 14, and a lifting hook engaging part 15, and the pressurized part 14 has a second
A roller passage notch 16 as shown in the figure is formed. In FIG. 1, the upper rim device 6b
The right half is shown in the raised position and the left half in the lowered position. The upper rim device 6b engages with the lower rim device 6a in the lowered state to form a rim that engages with the bead portions on both sides of the tire 50 to be measured. As seen on the left side of FIG. 1, the interior of the held tire is hermetically isolated from the outer bundle and supplied with compressed air. Compressed air is supplied through a ventilation passage 17 that passes through the center of the vertical axis 3 of the load cell 1 and reaches the inside of the casing part 8 of the bearing, and a ventilation passage 18 that runs from inside the casing part 8 through the lower rim device 6b and into the tire. The air pipe 19 connected to the lower end of the vertical shaft 3 is connected to the solenoid valve 2.
0 to a compressed air source 21. In the figure, 22 and 23 are seal rings. The reason why the lower rim 9 and the upper rim 12 are formed in a stepped manner is to enable the present invention to be applied to tires with different sizes.

A cylindrical body 25 is rotatably mounted on the outer periphery of the casing part 8 of the lower rim device via a ball bearing 24, and two arms 26 are attached from the cylindrical body 25.
protrude symmetrically to both sides, and a pressure roller 27 is pivotally supported on the arm 26 of the arm 26 for pressing down on the upper surface of the pressurized portion 14 of the upper rim device 6b in the lowered position. As seen in FIG. 2, the arm 26 and roller 27 are sized to pass through the roller passage notch 16 of the pressurized portion 14 when the upper rim device 6b is lowered. A swing driving arm 29 having a fork-shaped tip 28 is provided so as to descend from above and engage with this arm 26, and the arm 26 is pivoted so as to be removed from above the roller passage notch 16. by roller 27
rides on the pressurized part 14 and exerts a pressurizing effect. That is, the lower rim device 6a and the upper rim device 6b are provided with lock portions for locking the engaged state of both. 30 in the figure is a bearing holder and an airtight lid.

31 is an upper rim attachment/detachment device in which a lifting hook 33 is pivotally supported on a lifting arm 32;
In the figure, the right half is shown in the raised position and the left half is shown in the lowered position. The lifting hook 33 engages with the engaging portion 15 of the upper rim device 6b and lifts the lifting arm 3.
This can be lifted up by lifting 2. 34 is a support tube for the lifting arm 32, and 35 is a support shaft for the swing drive arm 29, both of which are connected to a suitable drive device.

36 is an elevating roller conveyor, which has a through hole 37 through which the upper rim device 6b can pass through and which is smaller than the tire to be measured, as shown in FIG. Ru. The raised position is slightly higher than the upper end of the lower rim device 6a, and the center of the through hole 37 and the vertical axis 3 are aligned. Its lowered position is slightly lower than the lower rim 9. This elevating roller conveyor 36 is also shown in FIG. 1 with its right half in a raised position and its left half in a lowered position. The lifting roller conveyor 36 in the raised position has a tire carrying-in conveyor 38 and a tire carrying-out conveyor 3.
9 are provided so as to be connected in front and behind.

Reference numeral 40 denotes a tire rotation drive drum, which is supported by a stand 41 with its axis vertical and is rotationally driven by a motor 42. The stand 41 is connected to a motor 43 with a brake, screws 44, nuts 45, and guides 46 The drum 40 can be moved horizontally by a configuration such as the above, and the drum 40 can be moved horizontally by the tire held by the rim device 6.
can be circumscribed and rotated.

In addition, 47 in FIG. 1 is the lower rim device 6a.
It is a brake device for

This tire testing machine operates as follows. First, the center of the tire 50 sent onto the lifting roller conveyor 36 by the tire carry-in conveyor 38 is aligned with the center line of the vertical shaft 3 by a suitable centering device (not shown). The lifting roller conveyor 36 then lowers to place the tire 50 on the lower rim assembly 6a. Then, the upper rim device 6b supported at the upper position by the upper rim device attachment/detachment device 31 is lowered,
Engages with the lower rim device 6a. When the upper rim device attaching/detaching device 31 descends, the support shaft 35 also descends, and the prong tip 28 of the swing drive arm 29 engages with the arm 26. In this state, the support shaft 35 rotates about 45 degrees to drive the arm 26 as shown at 26' and 28' in FIG. . As a result, the upper rim device 6b is pushed down sufficiently to clamp the tire 50 together with the lower rim device 6a, and are locked in this state. Thereafter, the hook 33 is removed and the support arm 32 and support shaft 35 are raised. Inside the tire 50, a solenoid valve 20 is connected to the compressed air source 21.
Air at a predetermined pressure is supplied through the ventilation pipe 19 and ventilation paths 17 and 18.

Next, the drum 40 is pressed against the tire 50 by the operation of the motor 43. At this time, the drum 40 is driven at a predetermined rotational speed by the operation of the motor 42 before contacting the tire 50;
There are cases where the vehicle is driven after contacting the tire 50, but either method is acceptable. drum 40 tires 50
When the load in the tire radial direction detected by the load cell 1 reaches a predetermined value (if the drum is rotating, the average value during one rotation of the tire), the motor 43 is stopped and the brake is applied. The distance between the axes of the drum 40 and the tire 50 is maintained as is. A load cell measures the forces and couples in the X, Y, and Z axis directions that are generated in the rotating tire while receiving the load. When the measurement is completed, the motor 43 is reversed and the drum 40 is returned to its original position as shown. Immediately after that, while the tire 50 continues to rotate due to inertia, by analyzing the force and couple detected by the load cell 1, it is possible to determine the amount and direction of the dynamic balance of the tire 50 (the unbalance relative to the reference position). Direction angle) can be measured. That is, the balance on one side can be measured by measuring force, and the balance on two sides can be measured by measuring force and couple. In order to do this, it is necessary to determine the rotational direction reference position of the tire 50, which can be done in advance by using the upper rim device 60, rim attaching/detaching device 31, support shaft 35, etc., to determine the reference angular position detector, marking device, etc. All you have to do is set it up.

When all measurements are completed, the brake 47 is operated to stop the rotation of the tire 50, and the solenoid valve 20 is switched to exhaust mode to exhaust the air inside the tire 50. Subsequently, the swing drive arm 29 is lowered so that its fork 28 engages the arm 26 and rotates to position the arm 26 in the roller passage notch 16 . In order to automatically engage the fork 28 with the arm 26, the rotational position detector may be used. When the roller 27 comes to be located in the notch 16, the pressing force is removed and the upper rim device 6b is lifted up by the upper rim attachment/detachment device 31. Next, when the elevating roller conveyor 36 rises, the tire 50 supported by the lower rim device 6a is supported by the elevating roller conveyor 36, is lifted to the height of the carry-out conveyor 39, and is sent onto the carry-out conveyor 39. With this, one cycle of tire testing is completed, and we are waiting for the next tire to be brought in.

Although the details of the control device are not explained in the above embodiments, automatic operation is possible by sequence control. In that case, the carrying of tires onto the elevating load conveyor 36 is appropriately regulated so that only one tire at a time is carried.

As mentioned above, according to this invention, since the load cell is installed on the rim side to which the tire is attached, the rotational mass on the tire side is smaller than when the load cell is installed on the drum (road wheel) side when measuring force and couple. Due to its small size, the response is sensitive, and the use of a single multi-force load cell has the unique advantage of being able to measure certain points with higher precision than the use of two load cells. Moreover, according to this invention, in addition to the uniformity test, it is possible to easily measure the dynamic balance and the weight by slightly extending the time when the drive drum and tire are separated, so these tests can be performed in separate processes. Production efficiency is improved because the measurement of Note that weight measurement is a measurement element necessary for grading tires, and this data can be used for grading.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal side view for explaining the general configuration and operation of the embodiment of this invention;
The figure is a plan view of the main part of FIG. 1. DESCRIPTION OF SYMBOLS 1... Load cell, 3... Vertical axis, 4... Measuring element part, 6... Rim device, 6a... Lower rim device, 6b... Upper rim device, 9... Lower rim, 11... Upper rim member Joint part, 12... Upper rim, 13... Lower rim engaging part, 14... Pressurized part, 15... Hook engaging part, 16... Roller passage notch, 17, 18... Ventilation path, 27 . . . Pressure roller, 29 . . . Swivel drive arm, 31 .

Claims (1)

[Scope of utility model registration request] A lock part is provided that supports the bead part of a tire whose center axis of rotation is in a vertical state by sandwiching it from above and below, is capable of injecting air into the tire, and is formed in upper and lower parts, and the above-mentioned support state is locked between the two parts. a vertical shaft that rotatably supports the lower rim device at its upper end; and a fixed base that supports the vertical shaft and the shaft; a six-component force detection load cell capable of detecting component forces in three axes perpendicular to each other including the axis and moments around the three axes; An upper rim attachment/detachment device is provided so that the device can be attached and detached, and the device can be detached from the upper rim device in the attached state, and the device is supported by the stand with its axis vertical and moves with the stand by a feeding device provided for the stand. A tire testing machine comprising: a tire rotation drive drum mounted externally to the tire held between the upper and lower rim devices and separated from the tire;