JP2003004597A - Uniformity of wheeled tyre and/or dynamic balancing test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic balancing test device capable of more precise measurement of the uniformity of a rotating tyre with wheel and/or of the dynamic balance of the same. SOLUTION: This dynamic balancing test fixture is constituted such that a wheel frame for mounting a wheel has a tapered cylinder or column-shaped protrusion at the outer periphery thereof, and a top adaptor has a collet member having a cylindrical body whose outside diameter is so formed as to be slightly smaller than the diameter of a hub hole in the wheel, while an inner periphery of the cylindrical body of the collet member is formed as a tapered surface which becomes thinner as it is more distant away from the flat plane part of the wheel frame. Furthermore, the inner periphery of the collet member being left to be in such a state that it is in contact with an outer periphery of the protrusion of the wheel frame, the cylindrical body of the collet member is made to snap into the hub hole by further pushingly forcing the collet member onto the flat plane part of the wheel frame so that the wheel is just positioned. Thus such constitution has helped solve the above-metioned problem.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic balance and / or uniformity testing device for wheeled tires.

[0002]

2. Description of the Related Art Conventionally, a dynamic balance test for measuring an eccentricity of a tire and a uniformity test for measuring a variation in force generated by a rotating tire are known. The dynamic balance test is to detect the eccentricity of the tire from changes in the vibration state when the tire is rotated. In the uniformity test, the tire is rotated while the rotating drum is pressed against the outer peripheral surface of the tire, and the load fluctuation in the radial direction and the thrust direction of the tire is measured.

As a test apparatus for performing the uniformity test and the dynamic balance test, for example, Japanese Patent Application No. 2001-065.
There is a test device described in No. 812. In the test device described in the above publication, a tire is attached to a spindle that is rotatably supported in a spindle housing via bearings and is rotated at a predetermined rotation speed.

Here, in the test device described in the above publication, a ring-shaped protrusion, which is accurately positioned and fixed to the spindle, is fitted into the inner edge of the hub hole of the wheel so that the spindle rotates. The tire is positioned in the vertical direction.

However, since the dimensional tolerance of the diameter of the hub hole of the tire is generally about 0.2 mm, even if the dimensional accuracy of the annular projection is increased, the concentricity between the tire rotation shaft and the spindle rotation shaft is increased. Tolerance cannot be less than 0.1 mm. Therefore, in the test device described in the above publication,
Since the tire can be rotated with a maximum misalignment of 0.1 mm, it cannot be said that the uniformity test and dynamic balance test have been performed accurately.

[0006]

In view of the above-mentioned circumstances,
An object of the present invention is to provide a dynamic balance testing device capable of more accurately measuring the uniformity and / or dynamic balance of a rotating wheeled tire.

[0007]

In order to achieve the above object, a dynamic balance and / or uniformity testing device for a wheeled tire according to claim 1, wherein a wheel mount on which the wheel is mounted is It has a tapered cylindrical or cylindrical projecting portion that protrudes vertically from the plane portion, penetrates the hub hole of the wheel, has the rotation axis of the spindle as a central axis, and has an outer peripheral portion that becomes thinner as it goes away from the plane portion. , The top adapter has a collet member having a cylindrical portion whose outer diameter is formed to be slightly smaller than the diameter of the hub hole of the wheel, and the inner circumference of the cylindrical portion of the collet member decreases with increasing distance from the flat surface portion. Is formed as a taper surface having a slope substantially equal to the slope of the taper portion of the protrusion of the wheel mount, and the collet member is The cylindrical portion of the collet member has a plurality of slits formed in parallel with the central axis of the cylindrical portion and extends from one end of the cylindrical portion facing the flat surface portion of the wheel pedestal. By further pushing the collet member toward the flat surface portion of the wheel frame in a state of being in contact with the outer circumference of the protruding portion, the slit is expanded and the outer diameter of the cylindrical portion of the collet member is increased to the diameter of the hub hole. Then, the wheel-equipped tire is positioned by bringing the cylindrical portion into contact with the hub hole.

Therefore, according to the dynamic balance and / or uniformity testing apparatus for a wheeled tire according to the first aspect of the present invention, the central axis of the protruding portion of the wheel mount always passes through the center of the hub hole. The wheels are positioned and fixed.

Further, the protrusion of the wheel mount has a tapered cylindrical shape, and the top adapter is integrated with a shaft inserted through the cylinder of the protrusion of the wheel mount into the wheel mount in the rotation axis direction of the spindle. And pushing the wheel toward the flat surface of the wheel pedestal by pulling the shaft into the wheel pedestal (claim 2), and the collet member is And a top adapter having a spring member having one end fixed to the shaft and the other end fixed to the collet member, while allowing the shaft adapter to advance and retreat in the axial direction of the shaft while sliding on the shaft (claim 3). However, the spring member may be configured to press and urge the collet member toward the flat surface portion of the wheel mount (claim 4).

With such a structure, the operation of pressing the wheel by the pressing biasing member and the operation of pressing the biasing force of the collet member toward the flat surface of the wheel stand are performed by a single drive. It can be done by force.

The wheel mount includes a cylinder,
The cylinder has a piston member that can be moved up and down by air pressure, the piston member chucks the shaft,
Further, the shaft may be drawn into the wheel base by lowering the piston member (claim 5). Further, the shaft may be chucked to the piston member by a collet chuck mechanism (claim 6).

The pressing biasing member may be a pin-shaped member that is inserted into a bolt hole of a tire with a wheel and biases the wheel at the position of the bolt hole. ).

Further, the uniformity and / or dynamic balance test device for the wheeled tire replaces the top adapter according to the hub hole diameter and / or the position and number of bolt holes of the wheeled tire. A configuration having exchange means may be provided (claim 8).

With such a structure, the top adapter is replaced by the top adapter exchanging means to push the top adapter into a pin-shaped pressing force according to the position and number of the collet member and the bolt hole having the outer diameter corresponding to the hub hole diameter of the tire. By replacing the top adapter with a member, it is possible to carry out a uniformity and / or dynamic balance test on a plurality of types of wheeled tires with a single test device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a basic configuration of a uniformity and dynamic balance compound test apparatus 1 (hereinafter, compound test apparatus 1) according to an embodiment of the present invention. In addition, in the following description, as shown in FIG.
However, the configuration of the composite test apparatus 1 may be upside down, or may be horizontally placed.

The apparatus frame of the composite test apparatus 1 includes a base 50 and a support column 52 extending vertically upward from the base 50.
The top plate 54 is supported by the support column 52. A spindle 120 that holds and rotates the tire C with wheels and a spindle housing 110 that rotatably supports the spindle 120 are attached to the base 50. By the support shaft (not shown) extending from the device frame of the composite test apparatus 1, the spindle housing 1
10 is rigidly supported by the base 50.

The composite test apparatus 1 is configured to hold the tire C by chucking the wheel of the tire C. First, the structure for supporting the tire C will be described.

FIG. 2 is a sectional view (a) and a front view (b) of a general tire C with wheels. The wheeled tire C includes a tire portion T ′ and a wheel W. Further, the wheel W has a rim portion R to which a tire is attached.
And a disk portion D attached to an axle hub or the like. A hub hole H is formed at the center of the disc portion D. A plurality of (four in this case) bolt holes B are formed around the hub hole.

FIG. 3 shows a spindle 120 and a spindle housing 1 for holding a tire C with wheels.
10 is a side sectional view of FIG. Spindle housing 110
Is a prismatic member, and a through hole capable of mounting the double row cylindrical roller bearings 112a and 112b and the combined angular contact ball bearing 113 is bored in the thrust direction of the central portion thereof.

The spindle 120 comprises a hollow portion 120a and a bracket portion 120b. Also, the spindle 120
The upper end of the bracket portion 120b of the bracket protrudes horizontally to form a flange portion 120e. The spindle 120 is driven by the spindle housing 110 (double-row cylindrical roller bearing 112).
rotatably supported (via a and 112b, and a combination angular contact ball bearing 113). Here, the double-row cylindrical roller bearings 112a and 112b support the spindle shaft in the radial direction, and the combined angular contact ball bearing 113 is also used.
Supports the spindle shaft in both radial and thrust directions.

A pull-in cylinder unit 600 is fixed to the flange portion 120e of the spindle 120 by a bolt (not shown). Retracting cylinder unit 6
At the upper end of 00, the wheel W of the tire C with wheels is
An abutting surface 603 that abuts on the disc portion D is provided.

Further, a shaft engaging hole 604, into which the insertion shaft 503 of the top adapter 500 is slidably mounted, is formed at the center of the contact surface 603. further,
A peripheral portion of the shaft engaging hole 604 of the contact surface 603 forms a protruding portion 605 having a tapered cylindrical shape that protrudes upward by a predetermined height and becomes narrower upward. The outer diameter of the thickest portion (lower end) of the protruding portion 605 is configured to be slightly smaller than the hub hole H of the wheel W of the tire C with wheels. Also,
The central axis of the protrusion 605 coincides with the rotation axis of the spindle 120. Here, when the tire C is attached to the spindle 120, the tire C with wheels is installed on the contact surface 603 so that the hub hole H is penetrated by the protrusion 605.

Above the retracting cylinder unit 600, a top adapter 500 for pressing the wheel W against the contact surface 603 is provided. Top adapter 500
Is composed of a plurality of (here, four) pins 501 that engage with the bushes inside the bolt holes B of the wheel, and a disc 502 protruding from the plurality of pins. Furthermore, disk 5
From the center of 02, retract cylinder unit 600
An insertion shaft 503 axially inserted into the inside of the shaft extends downward. The insertion shaft 503 is inserted into the retracting cylinder unit 600 so that the central axis of the insertion shaft 503 and the rotation axis of the spindle 120 coincide with each other.

In addition, the insertion shaft 503 is provided with a spring guide (upper) 532, a coil spring 533, from above.
The spring guide (lower) 531 and the collet 534 are sequentially inserted.

Both the spring guide (upper) 532 and the spring guide (lower) 531 are annular members whose outer peripheral portions are formed stepwise, and the outer diameter of the small diameter is the inner diameter of the coil spring 533. Is equal to The spring guide (upper) 532 and the spring guide (lower) 531 are coil springs so that the outer circumferences of the spring guide (upper) 532 and the spring guide (lower) 531 contact the inner circumference of the coil spring 533, respectively. It is inserted in 533. Further, in this state, both ends of the coil spring 533 are fixed to the spring guide (upper) 532 and the spring guide (lower) 531.

The upper surface of the spring guide (upper) 532 is fixed to the lower surface of the disc 502 of the top adapter 500. On the other hand, the spring guide (lower) 531 can move up and down while sliding with respect to the insertion shaft 503.

The collet 534 is a cylindrical member provided with a flange portion 534a projecting inward in a flange shape at its upper end. The diameter of the inner circumference of the flange portion 534a of the collet 534 is equal to the diameter of the insertion shaft 503. Therefore, the collet 534 can move up and down while sliding with respect to the insertion shaft 503. The collet 534 is positioned so that the central axis of the cylindrical portion of the collet 534 coincides with the central axis of the insertion shaft 503.

Further, the inner circumference of the cylindrical portion of the collet 534 is formed in a taper shape such that the diameter becomes smaller toward the upper side (that is, the cylindrical portion becomes thicker toward the upper side). Here, the inclination of the taper is substantially equal to the inclination of the taper portion of the protrusion 605 of the retracting cylinder unit 600. The outer diameter of the cylindrical portion of the collet 534 is slightly smaller than the diameter of the hub hole H of the tire C with wheels.

Further, the flange portion 534 of the collet 534 is
The upper surface of a is fixed to the lower surface of the spring guide (lower) 531. That is, the collet 534 is formed by the coil spring 533, the spring guide (upper) 532 and the spring guide (lower) 531.
It is suspended from a circular disc 502 of 00.

Insert shaft 503, coil spring 5
FIG. 5 shows a perspective view of 33, the spring guide (upper) 532, the spring guide (lower) 531 and the collet 534. As shown in FIG. 5, a plurality of slits 534c extending upward from the lower end of the collet 534 are cut out on the side surface 534b of the cylindrical portion of the collet 534.
Therefore, when the collet 534 is further pushed downward while the inner circumference of the cylindrical portion of the collet 534 is in contact with the outer circumference of the protrusion 605 of the retracting cylinder unit 600, the slit 5
34c is expanded and the outer diameter of the cylindrical portion of the collet 534 increases. In the embodiment of the present invention, when the collet 534 is pushed down to the maximum when the wheeled tire C is not attached to the cylinder retracting unit, the outer diameter of the cylindrical portion of the collet 534 is equal to the wheeled tire. It is configured to exceed the diameter of the hub hole of C.

The upper end of the slit 534c is a through hole 534d which is formed in the cylindrical portion of the collet 534 in the radial direction. The diameter of the through hole 534d is configured to be larger than the width of the slit 534c, and when the slit 534c is expanded, stress is prevented from concentrating on the upper end of the slit 534c and cracking the upper end of the slit 534c.

Further, as shown in FIG. 3, since the top adapter 500 is moved up and down by the inserter unit 200, the cylindrical mounting member 5 is provided above the disc 502.
10 are formed. At the tip of the mounting member 510,
An engaging flange portion 520 is provided that is engaged with the chuck claw 210 of the inserter unit 200 from the outside.

Further, as shown in FIG. 3, the insertion shaft 5
03 is drawn into the retracting cylinder unit 600, the disk-shaped piston 610 slidable in the axial direction is provided in the air chamber 620 inside the retracting cylinder unit 600.
Is provided. Further, a guide shaft 613 axially inserted into the retracting cylinder unit 600 extends downward from the center of the piston 610 so that the piston 610 can slide in the axial direction of the spindle. The guide shaft 613 has a guide shaft engaging hole 606 formed in the lower surface of the retracting cylinder unit 600.
By slidably engaging the piston 610, the piston 610 is always kept substantially perpendicular to the central axis of the spindle 120. The tip of the guide shaft 613 passes through the guide shaft engaging hole 606 and is inserted into the bracket portion 120b of the spindle 120.

Further, the piston 610 is connected to the spindle 120.
Of the guide shaft 613 to move in the direction of the central axis of
An air passage 614 is formed in the piston 610 to supply air from the bracket portion 120b of the spindle 120 to the portion 621 of the air chamber 620 above the piston 610.

Similarly, the piston 610 is connected to the spindle 12
Cylinder unit 6 to move in the direction of the central axis of 0
An air passage 615 for supplying air from the air passage 135 of the spindle 120 to the portion 622 of the air chamber 620 below the piston 610 is formed on the lower surface of 00.

Here, the spindle 120 has a rotary joint 14 provided at the lower end of its hollow portion 120a.
5 is configured to send air into the air chamber 620. Therefore, the air pipe 1 that vertically penetrates the hollow portion 120a of the spindle 120 is formed in the hollow portion 120a.
15 are provided. The upper end of the air pipe 115 is fixed to the air pipe 115 by the flange 116, and the lower end is connected to the rotary joint 145.

An air hose 132 for sending air into the air pipe 115 is connected to the rotary joint 145. The air sent from the air hose 132 via the rotary joint 145 passes through the air pipe 115 upward, further passes through the air passage 138 formed in the bracket portion 120b, and reaches the switching valve 131. The switching valve 131 allows the air that has escaped to the air passage 138 to pass through the bracket portion 120b or the air passage 1 of the spindle 120.
It is to switch which one of 35 is sent.

Therefore, by operating the switching valve 131 to send the air released to the air passage 138 to the bracket portion 120b, the portion 6 of the air chamber 620 above the piston 610 is discharged.
The internal pressure of 21 rises and the piston 610 descends. On the other hand, by operating the switching valve 131 to send the air released into the air passage 138 to the air path 135 of the spindle 120,
The internal pressure of the portion 622 of the air chamber 620 below the piston 610 rises, and the piston 610 rises.

An insertion shaft connecting portion 630 is formed on the upper surface of the piston 610. Insertion shaft connecting portion 63
0 and the insertion shaft 503 described above are configured to be chucked by a so-called collet chuck. That is, the insertion shaft connecting portion 630 includes the insertion shaft 50.
3 has an insertion hole 631 formed therein, and a wall 632 between the outer periphery of the insertion shaft 503 and the insertion hole 631.
A holding groove 634 for holding the ball 633 is formed in the. The holding groove 634 is configured to hold the ball 633 such that the ball 633 cannot be removed and is movable in the wall thickness direction.
Further, since the thickness of the wall 632 is smaller than the outer diameter of the ball 633, the ball 633 is in a state of either projecting inside the insertion hole 631 or projecting outside the outer periphery of the connecting portion 630.

The outer periphery of the connecting portion 630 is surrounded by the connecting portion engaging inner peripheral wall 641 of the retracting cylinder unit 600. A groove (a portion having an inner diameter larger than the others) 642 extending in the circumferential direction is formed in the coupling portion engagement inner peripheral wall 641. The ball 633 held by the connecting portion 630 is inserted into the groove 642.
When at the same height as the ball 633,
There is room to project outside of the outer circumference of. In this state,
The insertion shaft 503 can be inserted into the insertion hole 631 of the connecting portion 630 (without being obstructed by the ball 633).

After inserting the insertion shaft 503 into the insertion hole 631 of the connecting portion 630, air is sent to the portion 621 of the air chamber 620 above the piston 610 to move the connecting portion 630 downward together with the piston 610. The ball 633, which can no longer project to the outside of the portion 630, projects to the inside of the insertion hole 631 and engages with the engagement groove 503a formed at the tip of the insertion shaft 503. As a result, the insertion shaft 503 is securely chucked in the retracting cylinder unit 600 as shown in FIG. Also, at this time,
The pin 501 of the top adapter 500 engages with the bolt hole B of the wheel W, and pushes the wheeled tire C against the contact surface 603 of the retracting cylinder unit 600.

In the process of retracting the insertion shaft 503 as described above, the inner periphery of the collet 534 contacts the outer periphery of the protrusion 605 of the retracting cylinder unit 600.
If the insertion shaft 503 is further pulled in from this state,
The downward displacement of the collet 534 is blocked by the protrusion, and the collet 534 moves upward relative to the insertion shaft 503. Therefore, the spring guide (top)
The distance between 532 and the spring guide (lower) 531 is reduced, and the coil spring 533 is compressed.

As a result, the reaction force due to the compression of the coil spring 533 is transmitted to the collet 534 via the spring guide (lower) 531 and the collet 534 is pushed downward.

When the collet 534 is pushed in, the slit 534c is expanded and the collet 534 is extended.
The outer diameter of the cylindrical part of is increased. As the insertion shaft 503 is retracted, the outer diameter of the cylindrical portion of the collet 534 increases until the collet 534 is fitted into the hub hole H of the tire C with wheels. When the outer diameter of the cylindrical portion of the collet 534 reaches the diameter of the hub hole H, that is, when the insertion shaft 503 is further retracted after the collet 534 is fitted in the hub hole H of the tire C with wheels, the collet 534 is Since it moves relatively upward with respect to the insertion shaft 503, the outer diameter of the cylindrical portion of the collet 534 does not increase.

As described above, in the embodiment of the present invention, the outer diameter of the cylindrical portion of collet 534 is increased by retracting insertion shaft 503. Further, since the insertion shaft 503 is retracted in a state in which the central axis of the cylindrical portion of the collet 534 and the central axis of the protruding portion 605 of the retracting cylinder unit 600 are always aligned, the insertion shaft 503 is retracted, so Slit 5
The portion excluding 34c is kept in a perfect circle with the center axis of the cylindrical portion of the collet 534 as the center of gravity, regardless of the outer diameter of the cylindrical portion of the collet 534.

Therefore, even if the diameter of the hub hole H varies, the wheeled tire C is chucked so that the central axis of the hub hole H and the central axis of the insertion shaft 503 always coincide with each other. Therefore, even if the diameter of the hub hole H varies,
The wheeled tire C is fixed to the spindle 120 in a state where the central axis of the hub hole H, that is, the rotation axis of the wheeled tire C and the rotation axis of the spindle 120 are always aligned.

On the other hand, from this state, air is sent to the portion 622 of the air chamber 620 below the piston 610, and the connecting portion 630 is moved upward together with the piston 610 as shown in FIG. 4 (outer than the connecting portion 630. Can no longer project)
The engagement between the ball 633 and the engagement groove 503a is released. Therefore, the pressing state of the wheel-mounted tire C on the contact surface 603 of the pull-in cylinder unit 600 by the pin 501 of the top adapter 500 is released.

The double-row cylindrical roller bearing 112a is attached to the spindle 1
A method of fitting the wire 20 will be described with reference to FIG. A collar 121a having a rectangular cross section is fitted into the bracket portion 120b of the spindle 120. Here, the upper surface of the collar 121a contacts the lower surface of the flange portion formed at the upper end of the bracket portion 120b.

Here, the outer periphery of the portion of the bracket portion 120b that engages with the double-row cylindrical roller bearing 112a is formed with a tapered surface 120d that thickens upward. Also,
The inner circumference of the double-row cylindrical roller bearing 112a has a tapered surface 120d.
It is formed in a taper shape having the same slope as that of the above and thickening upward. The diameter of the upper end of the tapered surface 120d is slightly larger than the diameter of the inner circumference of the double-row cylindrical roller bearing 112a.

Further, a collar 121b having a rectangular cross section is fitted between the double-row cylindrical roller bearing 112a and the combined angular contact ball bearing 113. Here, the upper surface of the collar 121b contacts the lower end of the double-row cylindrical roller bearing 112a. Similarly, the lower surface of the collar 121b is a combination angular contact ball bearing 1
Abut on the upper end of 13. Further, the bracket portion 120b
A collar 121c having a rectangular cross section is fitted in the. Here, the upper surface of the collar 121c is the combined angular contact ball bearing 1
Abut on the lower end of 13.

Further, a male screw portion 120c is screwed on the bracket portion 120b. The male thread 120c
Is screwed below the lower surface of the collar 121c when the collar 121a, the double-row cylindrical roller bearing 112a, the collar 121b, the combined angular contact ball bearing 113 and the collar 121c are fitted into the bracket portion 120b.

Here, the collar 121a, the double-row cylindrical roller bearing 112a, the collar 121b, the combined angular contact ball bearing 113 and the collar 121c are sequentially fitted into the bracket portion 120b. At this time, the double-row cylindrical roller bearing 112
a is fitted in the bracket part 120b.

Next, the urging nut 114a having an internal thread portion capable of being screw-contacted with the external thread section 120c is screwed onto the external thread section 120c, and further tightened with a predetermined torque to form a double row cylindrical roller. The bearing 112a is pushed upward. Next, in order to prevent the urging nut 114a from loosening, the male thread 120c is provided with a locking nut 114b.
Is screwed on and the upper surface of the locking nut 114b is urged against the lower surface of the urging nut 114a.

As described above, the diameter of the upper end of the tapered surface 120d is slightly larger than the diameter of the inner circumference of the double-row cylindrical roller bearing 112a, and as a result, the tapered surface 120d and the inner circumference of the double-row cylindrical roller bearing 112a. Stick together. Therefore, since the spindle 120 and the inner ring of the double-row cylindrical roller bearing 112a are completely integrated, the spindle 120 and the double-row cylindrical roller bearing 1
Rattling with 12a is prevented. Further, since the clearances between the inner ring and the steel balls of the combined angular ball bearing 113 and between the steel balls and the outer ring are minimized, there is rattling between the inner ring and the steel balls of the combined angular ball bearing 113 and between the steel ball and the outer ring. Is prevented.

The method of fitting the double-row cylindrical roller bearing 112b into the spindle 120 is as follows.
It is the same as the method of inserting into the spindle 120. Here, since the radial load applied to the double-row cylindrical roller bearing 112b is smaller than the radial load applied to the double-row cylindrical roller bearing 112a, the biasing nut directly biases the double-row cylindrical roller bearing 112b. The locking nut should not be used. That is, after inserting the double-row cylindrical roller bearing 112b into the hollow portion 120a of the spindle 120, the urging nut 114c is screwed onto the male screw portion screwed to the outer periphery of the hollow portion 120a.

In the uniformity test, the tire is rotated together with the spindle while the rotating drum is pressed with a force of several hundreds of kgf or more, and the variation of the force generated by the rotating tire is measured from the fluctuation of the load at that time. It is a test. In the embodiment of the present invention, the fluctuation of the load is measured by a load cell (not shown) attached to the rotating drum.

The dynamic balance test is a test in which the tire is rotated together with the spindle without the rotating drum, and the eccentricity of the tire is measured from the vibration force generated by the imbalance of the tire. The exciting force is applied to the spindle housing 110.
It is measured by the piezoelectric elements 185 installed at four positions on one side surface.

The piezoelectric element 185 is, for example, KISTLER.
It is a cylindrical sensor having a measurement range of approximately 0 to 10000 kgf, such as a quartz crystal type piezoelectric force sensor 9103A manufactured by a company, and converts a load applied in the axial direction into an electric signal. In order to accurately measure the load applied to the spindle 120, the piezoelectric element 185 is installed in the spindle housing 1
It is integrated with 10.

That is, in order to integrate the piezoelectric element 185 with the spindle housing 110, the piezoelectric element 185 is sandwiched between the piezoelectric element fixing plate 102 and one side surface of the spindle housing 110. As shown in FIG. 3, at the position where the piezoelectric element 185 of the piezoelectric element fixing plate 102 is in contact, the through hole 10 having a diameter substantially the same as the hole of the piezoelectric element 185 in the plate thickness direction of the piezoelectric element fixing plate 102.
2a is perforated. Similarly, at a position where the piezoelectric element 185 of the spindle housing 110 is in contact, the spindle housing 11 to which the piezoelectric element 185 is attached is attached.
A through hole 110a having substantially the same diameter as the hole of the piezoelectric element 185 is bored in the plate thickness direction on one side of No. 0. A female screw is threaded on the inner periphery of the through hole 110a of the spindle housing 110.

Further, a cylindrical bar 186 having a male screw threadedly engageable with the female thread of the through hole 110a of the spindle housing 110 is engraved on the entire side surface, and the through hole 102a of the piezoelectric element fixing plate 102 and the piezoelectric bar are formed. Element 1
It is inserted in 85. Further, the bar 186 is screwed into the through hole 110a of the spindle housing 110.
The tip of the bar 186 is a double-row cylindrical roller bearing 112a.
Or it is in contact with 112b.

Here, a nut 187 is screwed onto the portion (left side in FIG. 3) of the bar 186 protruding from the piezoelectric element fixing plate 102. The nut 187 is tightened with a predetermined torque, so that the nut 187 has a torque of about 50.
The piezoelectric element fixing plate 102 is pressed by the axial force of 00 kgf. Therefore, the piezoelectric element 185 is sandwiched between the piezoelectric element fixing plate 102 and one side surface of the spindle housing 110 with a force of about 5000 kgf, and is integrated with the piezoelectric element fixing plate 102 and the spindle housing 110.

At the lower part of the hollow portion 120a of the spindle 120, there is a pulley 1 for rotating the spindle 120.
40 is attached. An endless belt 142 is stretched around the pulley 140, and a spindle drive motor 130 fixed to the base 50 (endless belt 142
Rotationally driven). That is, when the spindle drive motor 130 is rotated, the top adapter 500 and the retracting cylinder unit 600 are moved to the tire C with wheels.
The spindle 120 rotates while holding the.

By driving the top adapter 500 up and down,
The inserter unit 200 that inserts (or pulls out) the insertion shaft 503 of the top adapter 500 into the insertion hole 631 of the retracting cylinder unit 600 is shown in FIG.
It is attached to an elevating housing 60 arranged further above the top plate 54 shown in FIG. The lifting housing 60 is
It is movably supported by four sets of linear guides 61 extending in the vertical direction. Further, the lifting housing 60 has a ball screw 65 driven by a servo motor 66.
And the ball screw 6 provided on the outer surface of the lifting housing 60
It is driven up and down by an arm portion 67 in which a screw hole screwed with 5 is drilled.

FIG. 7 is a side view showing the structure of the inserter unit 200. Inserter unit 200
Has a substantially cylindrical unit body 240. The unit main body 240 is a substantially cylindrical unit main body 240.
And the spindle 120 are attached to the elevating housing 60 so that the spindle 120 and the spindle 120 are coaxial (so that the central axes are aligned).

At the lower part of the unit body 240, three chuck claws 210 (only two of which are shown in FIG. 6) which are engaged with the engagement flange portion 520 of the top adapter 500 from the outside are provided. The chuck claw 210 is urged outward in the radial direction of the unit body 240 by a spring member (not shown).

The chuck claw 210 is driven by the air pressure in the radial direction of the unit main body 240. That is, when air is supplied to an air supply port (not shown) provided in the unit main body 240, the air is supplied to the chuck claw 21.
0 is urged toward the inner side of the unit body 240 in the radial direction. Therefore, by supplying air to the unit main body 240, the chuck claw 210 moves inward in the radial direction of the unit main body 240 and chucks the engaging flange portion 520 of the top adapter 500. On the other hand, when the air is removed from the unit body 240 from this state, the chuck claw 210 is moved to the outside of the unit body 240 in the radial direction by the urging force of the spring member, and the chuck is released.

The tire C with wheels is held by the composite test apparatus 1 configured as described above as follows. First, air is supplied to the unit main body 240 of the inserter unit 200 to chuck the top adapter 500 with the chuck claws 210, and the ball screw 65 is driven to raise the elevating housing 60 to raise the top adapter 500.
Is pulled in and pulled out from the cylinder unit 600. Next, after the tire C is set in the retracting cylinder unit 600, the ball screw 65 is driven again to insert the top adapter 500 into the cylinder unit 600. Next, the unit body 240 of the inserter unit 200
The air is evacuated to release the chuck by the chuck claw 210 so that the top adapter 500 can rotate with the spindle 120.

Next, a uniformity test and a dynamic balance test using the composite test apparatus 1 will be described. Note that the following series of tests are performed by a program executed by a computer (not shown) of the composite test apparatus 1.

When performing the dynamic balance test, the composite test apparatus 1
The control unit (not shown) fixes the wheeled tire C to the spindle 120 using the top adapter 500, then rotates the spindle 120, and detects the fluctuation of the load applied to the piezoelectric element 185 during the rotation of the spindle 120. To do. Since a method for calculating the dynamic balance based on the detected load fluctuation is known, its description is omitted. Combined test equipment 1
Is a tire with a wheel C based on the dynamic balance calculation result.
Which part of the tire portion T'of which the balance weight should be placed is calculated, and by a marking device (not shown),
Mark the location.

In the uniformity test, the spindle 1
A rotary drum 300 provided on the side of 20 is used. The rotating drum 30 is close to the tire C with wheels /
A rack and pinion mechanism 35 (pinion 36, which is mounted on a movable housing 32 slidable on a rail 31 extending in a separating direction and driven by a motor not shown).
The rack 38) moves the tire C with wheels in the approaching / separating direction.

At the time of the uniformity test, the control unit (not shown) of the composite test apparatus 1 uses the rack and pinion mechanism 3
The rotary drum 30 is pressed against the tire portion T ′ of the tire C with wheels by 5 and the spindle 120 is rotated.
Then, while the spindle 120 is rotating, the tire C with wheels is attached by the load cell attached to the rotating drum 30.
The load fluctuation received by the rotary drum 30 is detected as a reaction force received from the tire C with wheels on the rotary drum 30. Since a method of calculating the uniformity based on the detected load fluctuation is known, the description thereof will be omitted. The composite test apparatus 1 calculates which portion of the tire portion T ′ of the wheeled tire C is to be cut and how much based on the uniformity calculation result, and cuts the tire portion T ′ by a cutting device (not shown).

The composite test apparatus 1 may have a top adapter exchanging means for exchanging the top adapter according to the hub hole diameter and / or the position and number of the bolt holes of the tire with wheels. By replacing the top adapter by the top adapter exchanging means with the top adapter 500 having the collet 534 having an outer diameter corresponding to the hub hole diameter of the wheeled tire C and the pin 501 corresponding to the position and number of the bolt holes, this composite Test equipment 1
Makes it possible to perform uniformity and / or dynamic balance tests on a plurality of types of wheeled tires C.

[0073]

As described above, according to the test apparatus of the present invention, it is possible to more accurately measure the uniformity and / or dynamic balance of the rotating tire.

[Brief description of drawings]

FIG. 1 is a side view of a composite test apparatus that can perform a dynamic balance test and a uniformity test of a tire according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view and a front view of a general tire with a wheel.

FIG. 3 is a side sectional view of the spindle according to the embodiment of the present invention.

FIG. 4 is a side sectional view of the spindle according to the embodiment of the present invention.

FIG. 5 is a perspective view showing the periphery of the insertion shaft of the top adapter according to the embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view around a bearing of the spindle according to the embodiment of the present invention.

FIG. 7 is a side view showing the structure of the inserter unit according to the embodiment of the present invention.

[Explanation of symbols]

1 Complex test equipment 30 rotating drum 50 base 60 lifting housing 65 ball screw 66 Servo motor 67 Arm 102 Piezoelectric element fixing plate 110 spindle housing 112a Double row cylindrical roller bearing 112b Double row cylindrical roller bearing 113 Combination Angular Contact Ball Bearing 114 colors 120 spindles 120b bracket part 120c male thread 120d taper surface 140 pulley 142 Spindle drive motor 143 cylinder 185 Piezoelectric element 187 nuts 200 inserter unit 240 unit body 210 chuck jaws 500 top adapter 501 pin 503 insertion shaft 520 Engagement flange part 531 Spring guide (bottom) 532 Spring guide (top) 533 coil spring 534 collet 534c slit 600 retract cylinder unit 604 shaft engaging hole 610 piston 613 guide shaft 614 Air route 620 air chamber 630 Insert shaft connecting part 631 insertion hole 633 ball 634 retaining groove

Claims (8)

[Claims] 1. A uniformity and / or dynamic balance test of a wheeled tire configured to rotate a spindle to perform a dynamic balance and / or uniformity test of a wheeled tire mounted on the spindle. A device, wherein the wheel mount is formed at one end of the spindle and has a flat surface portion on which the wheel is mounted; and a wheel mount provided on a side facing the flat surface portion of the wheel mount. And a top adapter having a pressing biasing member that holds the tire with a wheel by pressing and biasing the wheel base, and the wheel mount projects from a plane portion thereof and penetrates a hub hole of the wheel, A protruding portion in the shape of a taper cylinder or a column having a rotation axis of the spindle as a central axis and an outer peripheral portion which becomes thinner as the distance from the flat surface portion increases. The top adapter has a collet member having a cylindrical portion whose outer diameter is slightly smaller than the diameter of the hub hole, and the inner circumference of the cylindrical portion of the collet member is separated from the flat portion. Is formed as a tapered surface having a slope substantially equal to the slope of the taper portion of the protrusion of the wheel rack, the collet member extending from one end of the cylindrical portion of the collet member facing the flat surface portion of the wheel rack. Out, having a plurality of slits formed substantially parallel to the central axis of the cylindrical portion, further the collet member in a state where the inner periphery of the cylindrical portion of the collet member is in contact with the outer periphery of the protrusion of the wheel mount. By pushing toward the flat surface portion of the wheel mount, the slit is expanded and the outer diameter of the cylindrical portion of the collet member is increased to the diameter of the hub hole. The wheel-equipped tire uniformity and / or dynamic balance test device, wherein the wheel-equipped tire is positioned by bringing the cylindrical portion into contact with the hub hole. 2. The protrusion of the wheel mount has a tapered cylindrical shape, and the top adapter is integrated with a shaft inserted through the cylinder of the protrusion of the wheel mount into the wheel mount in the rotation axis direction of the spindle. 2. The pressure biasing member biases the wheel toward the flat surface portion of the wheel mount by pulling the shaft into the wheel mount.
Uniformity of the tire with wheels described in
Or dynamic balance test equipment. 3. The uniformity and / or dynamic fishing of the wheeled tire according to claim 2, wherein the collet member is capable of advancing and retracting in the axial direction of the shaft while sliding on the shaft. Test equipment. 4. The top adapter has a spring member having one end fixed to the shaft and the other end fixed to the collet member, the spring member directing the collet member toward a flat surface portion of the wheel mount. The tire uniformity and / or dynamic balance testing device for a wheeled tire according to claim 3, wherein the device is a biasing member. 5. The wheel mount has a cylinder and a piston member that can be moved up and down by air pressure in the cylinder, the piston member chucks the shaft, and the piston member is further lowered to move the shaft. The tire uniformity and / or dynamic balance testing device according to any one of claims 2 to 4, wherein is pulled into the wheel frame. 6. The uniformity and / or dynamic balance testing device for a wheeled tire according to claim 5, wherein the shaft is chucked to the piston member by a collet chuck mechanism. 7. The pressing urging member is a pin-shaped member that is inserted into a bolt hole of a wheel-equipped tire and presses and urges the wheel at the position of the bolt hole. A tire uniformity and / or dynamic balance testing device according to any one of claims 1 to 6. 8. A top adapter in which the uniformity and / or dynamic balance testing device for a wheeled tire replaces the top adapter depending on the hub hole diameter and / or the position and number of bolt holes in the wheeled tire. The uniformity and / or dynamic balance testing device for a wheeled tire according to claim 7, further comprising an exchange means.