JP6798862B2 - Tire dynamic balance and uniformity measuring device - Google Patents

Description

The present invention relates to a measuring device capable of measuring the dynamic balance and uniformity of a tire with one device.

As a measuring device capable of measuring the dynamic balance and uniformity of a tire with one device, for example, the following Patent Document 1 is known.

This measuring device includes a lock shaft to which an upper rim is attached and a spindle to which a lower rim is attached, and the lock shaft is connected via a lock member in a central hole of the spindle. As a result, the tire is fixed between the upper rim and the lower rim.

When the tire is attached or detached, the inserter unit inserts (or pulls out) the lock shaft into the center hole of the spindle.

The inserter unit includes an intermediate shaft rotatably supported by an elevating housing, and a chuck claw that engages from the inside with a fixing ring provided at the upper end of the lock shaft is provided at the lower end thereof. Further, a chuck driving member having a conical tip is held on the intermediate shaft so as to be movable up and down, and the conical tip abuts on the tapered surface of the chuck claw due to its lowering. As a result, each chuck claw can move outward in the radial direction and engage with the fixing ring. In this engaged state, the lock shaft can be pulled out from the center hole of the spindle by raising the elevating housing, and the tire can be replaced. After replacement, the housing is lowered and the lock shaft is inserted into the center hole of the spindle to fix the tire.

Further, at the time of conformity measurement, the upper end side of the lock shaft is supported by the engaged state (the state in which the conical tip is lowered and each chuck claw moves outward in the radial direction to engage with the fixing ring). it can. As a result, it is possible to bear the pressing load when the rotating drum is pressed against the tire. When measuring the dynamic balance, the conical tip is raised to release the engagement by the chuck claw.

However, in the above structure, since the upper end side of the lock shaft is supported by the chuck claws that can move in and out in the radial direction, it is difficult to sufficiently secure the rigidity of the supporting portion. Therefore, there is a problem that the pressing load by the rotating drum cannot be sufficiently supported, which causes a decrease in the measurement accuracy of the uniformity and a decrease in durability.

Japanese Unexamined Patent Publication No. 11-183298

An object of the present invention is to provide a tire dynamic balance and uniformity measuring device capable of improving the bearing capacity of a rotating drum against a pressing load to improve the measurement accuracy and durability of the uniformity.

The present invention has a first spindle portion that supports the upper rim and a second spindle portion that has an insertion hole for concentrically and integrally rotatably inserting and holding the first spindle portion and supports the lower rim. It is a tire dynamic balance and uniformity measuring device equipped with a spindle that can be divided into and.
A spindle suspender capable of suspending the first spindle portion and inserting it into the insertion hole,
It is equipped with a spindle upper end attachment / detachment means that can be connected to the upper end of the spindle at the time of uniformity measurement and can be disconnected from the connection at the time of dynamic balance measurement.
The upper end portion of the spindle has a flange portion that projects in the circumferential direction and a tapered cone-shaped connecting recess that extends concentrically downward.
The spindle upper end attachment / detachment means includes an elevating table that can move up and down, a sleeve that is rotatably supported by the elevating table, and is rotatably held in an inner hole of the sleeve and fitted with the connection recess at the lower end. Equipped with a holding shaft provided with a tapered cone-shaped protrusion that can be fitted,
The spindle suspender has a pair of gripping pieces that are supported by the lifting table and can be moved apart in the radial direction toward the axis of the spindle, and the gripping pieces approach each other to move between the gripping pieces. It is characterized in that the flange portion is locked.

In the tire dynamic balance and uniformity measuring device according to the present invention, each of the gripping pieces is provided with a locking groove that opens in a V shape toward the axial center, and a first spindle portion is provided between the locking grooves. It is preferable to sandwich the outer periphery of the portion below the flange portion.

In the tire dynamic balance and uniformity measuring device according to the present invention, it is preferable that the spindle suspender includes a cylinder that is attached to the lift and moves the grip piece toward the axis.

In the tire dynamic balance and uniformity measuring device according to the present invention, it is preferable that the outer peripheral surface of the protrusion has an inclination angle θ of 15 to 45 degrees with respect to the axis.

In the measuring device of the present invention, the spindle suspender and the spindle upper end attachment / detachment means are separately configured.

The spindle suspender has a pair of gripping pieces supported by an elevating table, and the pair of gripping pieces can move closer and apart toward the axis of the spindle. Therefore, the flange portion at the upper end of the spindle can be locked between the gripping pieces by approaching the gripping pieces, and the first spindle portion can be suspended by raising the elevating table in this locked state.

Further, in the spindle upper end attachment / detachment means, the holding shaft is rotatably held in the inner hole of the sleeve supported by the elevating table so as to be vertically movable. That is, the holding shaft can move up and down and rotate with respect to the lift. Therefore, by lowering the holding shaft, the protrusion at the lower end of the holding shaft and the connecting recess at the upper end of the spindle can be directly fitted without interfering with the spindle suspender, and both can be firmly connected. As a result, the bearing capacity of the rotating drum against the pressing load can be increased, and the measurement accuracy and durability of the uniformity can be improved.

Is a side view showing an facilities form of dynamic balance and uniformity of the measuring device of the tire of the present invention. It is sectional drawing which shows the connection state of the 1st spindle part and the 2nd spindle part. It is sectional drawing which shows the state before connection of the 1st spindle part and the 2nd spindle part. (A) is a cross-sectional view showing the spindle upper end attachment / detachment means together with the spindle suspender, and (B) is a bottom view of the spindle suspender viewed from below. It is sectional drawing which conceptually shows the measurement state of uniformity by a measuring apparatus. It is sectional drawing which conceptually shows the measurement state of the dynamic balance by a measuring device. It is a flowchart of a measurement method.

Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 1, the tire dynamic balance and uniformity measuring device 1 (hereinafter referred to as “measuring device 1”) of the present embodiment includes a spindle 2 for mounting the tire T and a spindle upper end attachment / detachment means 8. And the spindle suspending tool 40. The measuring device 1 of this example further includes a spindle housing 5 that rotatably supports the second spindle portion 4 of the spindle 2, a first driving means 6 for uniformity measurement, and a second drive for dynamic balance measurement. It is configured to include means 7.

The spindle 2 can be divided into a first spindle portion 3 that supports the upper rim 9U and a second spindle portion 4 that supports the lower rim 9L, and a tire T is mounted between the rims 9U and 9L. To.

As shown in FIG. 3, the first spindle portion 3 includes a central shaft portion 3A and a large-diameter head portion 3B arranged at the upper end thereof, and an upper rim 9U is integrally fixed to the head portion 3B. Will be done. In this example, a plurality of peripheral grooves 10 having a substantially semicircular cross section are formed at equal intervals on the outer periphery of the central shaft portion 3A.

The second spindle portion 4 has an insertion hole 11 into which the first spindle portion 3 is inserted. The second spindle portion 4 and the first spindle portion 3 are concentrically and integrally rotatably connected to each other in the insertion hole 11 via the connecting means 12.

The second spindle portion 4 of this example is divided into upper and lower spindle portions 4U and 4L, and the lower rim 9L is integrally fixed to the upper spindle portion 4U. Further, the connecting means 12 is provided on the upper spindle portion 4U.

In this example, a ball lock mechanism is adopted as the connecting means 12. Specifically, the spindle portion 4U above this example has a cylindrical shape having the insertion hole 11, and an airtight cylinder hole 13 forming an annular shape concentric with the spindle 2 is formed in the peripheral wall W thereof. To. The peripheral wall W has peripheral wall portions Wi and Wo inside and outside in the radial direction classified by the cylinder hole 13. A plurality of rigid balls 14 are held on the inner peripheral wall portion Wi so as to be able to appear and disappear from the inner peripheral surface and the outer peripheral surface of the peripheral wall portion Wi. In this example, a plurality of (three in this example) circumferential rows of the rigid balls 14 dispersed in the circumferential direction are formed in the axial j direction.

A cylindrical piston 15 that can slide and move in the axial direction j is housed in the cylinder hole 13. The piston 15 can slide and move by supplying and discharging compressed air to the cylinder hole 13. Further, on the inner peripheral surface of the piston 15, a plurality of peripheral grooves 16 having a substantially semicircular cross section for accommodating the protruding portion of the rigid ball 14 are formed. The peripheral grooves 10 and 16 and the rigid ball 14 have the same radius.

Therefore, in this example, as shown in FIG. 3, the rigid ball 14 can fall into the peripheral groove 16 at the slide position on one side (lower side in this example) of the piston 15 in the axial j direction. As a result, the first spindle portion 3 can be inserted into the insertion hole 11. Further, as shown in FIG. 2, after the insertion, the piston 15 moves to the slide position on the other side (upper side in this example) in the axial j direction, so that the rigid ball 14 is pushed out from the peripheral groove 16. As a result, the rigid ball 14 is fitted into the peripheral groove 10 of the first spindle portion 3 and locked. As described above, the ball lock mechanism of this example includes the cylinder hole 13, the piston 15, the peripheral grooves 10, 16 and the rigid ball 14.

The spindle housing 5 has a tubular shape, and the second spindle portion 4 is rotatably supported in the central hole 5H via a bearing means 17. As the bearing means 17, a cylindrical roller bearing, an angular contact ball bearing, or the like is appropriately adopted. Further, as shown in FIG. 1, the spindle housing 5 is supported by, for example, a rigid wall 19 erected on the base portion 18A of the frame 18. Further, a second sensor S2 for measuring the dynamic balance is arranged between the rigid body wall 19 and the spindle housing 5, and the load change due to the imbalance of the tire is measured. In this example, a load cell is adopted as the second sensor S2.

The first driving means 6 has a drum 20 that is rotationally driven around an axial center i parallel to the spindle 2, and when measurement of uniformity, the drum 20 is placed on the tread portion of the tire T with a predetermined load F (FIG. 5). By pressing with (shown), the tire T is rotated under a load. Specifically, the first driving means 6 has a movable housing 22 slidable on a rail 21 extending in a direction close to / separated from the tire T, and the drum 20 pivotally supported by the movable housing 22. To prepare. The drum 20 is rotationally driven at an arbitrary rotation speed by a motor (not shown) supported by the movable housing 22. Further, the drum 20 is moved in the direction of approaching / separating from the tire T by the pressing means 23 supported by the frame 18, and is pressed against the tire with a predetermined load F. In this example, the cylinder is shown as the pressing means 23, but various ones such as a rack and pinion mechanism driven by a motor are adopted.

The uniformity is measured by the first sensor S1 arranged on the drum 20 side. The first sensor S1 is provided between the rotating shaft portion 20A of the drum 20 and the movable housing 22, and the force applied to the movable housing 22 from the drum 20 in contact with the tire T (for example, the tire radial direction, the tire width direction, and the tangent line). The direction, etc.) is measured, thereby measuring the uniformity generated in the tire T. As the first sensor S1, for example, an axle component force meter or the like is preferably adopted.

The second driving means 7 has a pulley 25 arranged at the lower end of the second spindle portion 4 and a driving belt 26 wound around the pulley 25, and the tire T is in a no-load state at the time of dynamic balance measurement. Rotate with. The pulley 25 is concentrically and integrally rotatable with the second spindle portion 4. Further, in this example, the belt 26 is wound between the drive side pulley 27 connected to the motor M supported by the frame 18 and the pulley 25.

The second sensor S2 is preferably arranged so as to measure a load in a direction perpendicular to the axis j of the spindle 2 and perpendicular to the tension direction of the belt 26. As a result, the unbalanced load can be measured without being affected by the tension force of the belt 26. In FIGS. 1, 5 and 6, for convenience of drawing, the second sensor S2 is arranged in the direction of measuring the load in the tension direction.

Next, the spindle upper end attachment / detachment means 8 has a holding shaft 30 that can be raised and lowered and rotatably supported on the same axis j as the spindle 2. In the spindle upper end attachment / detachment means 8, the holding shaft 30 is connected to the upper end of the spindle 2 by its lowering during uniformity measurement (shown in FIG. 5). That is, the spindle 2 is supported in a double-sided manner with respect to the load F pressed by the drum 20. Therefore, the deflection of the spindle 2 is reduced, and the measurement accuracy of uniformity can be improved. Further, since a part of the pressing load F is supported by the holding shaft 30, the load at the support portion by the spindle housing 5 can be reduced, damage such as wear can be suppressed, and durability can be improved. Further, at the time of dynamic balance measurement (shown in FIG. 6), the holding shaft 30 is separated from the upper end of the spindle 2 by its rise, and the connection is released. As a result, the unbalanced load fluctuation can be appropriately measured by the second sensor S2 without being interfered with by the holding shaft 30, and the measurement accuracy of the dynamic balance can be improved.

As shown in FIG. 1, the spindle upper end attachment / detachment means 8 includes an elevating table 31, a sleeve 32, and the holding shaft 30.

The lift 31 is guided up and down by a rail 18B1 provided on a support column 18B of the frame 18. The lifting platform 31 is driven by a driving means 33 including, for example, a cylinder, and can move up and down between the ascending state P1 and the descending state P2. Further, as shown in FIG. 4A, the elevating table 31 includes a through hole 31A through which the holding shaft 30 passes, and a cylindrical guide portion 31B that surrounds the through hole 31A and rises from the elevating table 31. Eh.

The sleeve 32 includes a cylindrical body portion 32A that is guided up and down by the inner peripheral surface of the guide portion 31B. The sleeve 32 is driven by a driving means 35 including, for example, a pair of cylinders attached to the elevating table 31, and can move up and down between the ascending state Q1 and the descending state Q2.

Further, the holding shaft 30 is held in the inner hole of the sleeve 32 via the bearing means 36 so as to be rotatable around the axis j and vertically movable integrally with the sleeve 32. Further, a tapered cone-shaped protrusion 37 is projected from the lower end of the holding shaft 30.

At the upper end of the spindle 2, that is, the upper end of the first spindle 3, a flange 3C projecting in the circumferential direction and a tapered cone-shaped connecting recess 38 extending concentrically downward are formed. The connection recess 38 has a receiving surface portion 38S having the same slope as the protrusion 37, and when the holding shaft 30 is lowered, the protrusion 37 fits with the connection recess 38 (shown in FIG. 2), and the spindle 2 Can be connected concentrically with the top edge.

The angle θ of inclination of the outer peripheral surface of the protrusion 37 with respect to the axis j is preferably in the range of 15 to 45 degrees, and if it exceeds 45 degrees, the bearing capacity with respect to the load F decreases, and the measurement accuracy of the above-mentioned uniformity is improved. It becomes difficult to sufficiently achieve the improvement and the improvement of durability. Further, when the angle θ is less than 15 degrees, the strength of the protrusion 37 decreases, and the load F easily damages the protrusion 37.

Next, as shown in FIG. 3, the spindle suspender 40 suspends the first spindle portion 3 and inserts it into the insertion hole 11 when the tire T is mounted. The spindle suspender 40 is supported by the lift 31 so as to be vertically movable integrally with the lift 31. In FIGS. 1, 2, 5 and 6, the spindle suspending tool 40 is omitted, and in FIG. 3, the spindle upper end attachment / detachment means 8 is omitted.

The spindle suspender 40 has a pair of gripping pieces 41 that can be moved apart in the radial direction toward the axis j. By approaching the grip pieces 41 to each other, the flange portion 3C is locked between the grip pieces 41 and 41 to suspend the first spindle portion 3.

Specifically, as shown in FIGS. 4A and 4B, the spindle suspender 40 of this example is guided so as to be movable toward the axis j by a rail 42 provided on the lower surface of the lifting platform 31. A pair of moving pieces 44 to be formed and a gripping piece 41 attached to each moving piece 44 are included. The gripping piece 41 includes a locking groove 41A that opens in a V shape toward the axis j, and between the locking grooves 41A and 41A, the outer circumference of a portion of the first spindle portion 3 below the flange portion 3C. Can be gripped by sandwiching. Each grip piece 41 is simultaneously driven by a drive means 45 including, for example, a cylinder attached to the elevating table 31, and can move closer and further toward the axis j.

Next, a method of measuring the dynamic balance and uniformity of the tire T by using the measuring device 1 will be described below. In the measurement method of this example, as shown in FIG. 7, the mounting step, the second rotation step, the balance measurement step, the deceleration step, the first rotation step, and the uniformity measurement step are performed in this order. ..

In the mounting step, as shown in FIG. 3, a spindle suspender 40 is used to suspend and insert the first spindle portion 3 into the insertion hole 11 of the second spindle portion 4, and the first spindle portion 3 And the second spindle portion 4 are integrally rotatably connected via the connecting means 12. As a result, the tire T is mounted on the spindle 2.

In the second rotation step, as shown in FIG. 6, the spindle 2 is rotated by the second driving means 7 in a separated state in which the holding shaft 30 is separated from the upper end of the spindle 2. As a result, the tire T is rotated in a no-load state and at the second rotation speed. At this time, the drum 20 stands by in the rear and is not in contact with the tire T.

In the balance measurement step, the dynamic balance of the tire T is measured by the second sensor S2 in the state of the second rotation step.

In the deceleration step, after the dynamic balance is measured, the driving by the second driving means 7 is stopped to reduce the rotational speed of the tire T.

In the first rotation step, as shown in FIG. 5, the holding shaft 30 is lowered to connect the holding shaft 30 and the upper end of the spindle 2. After that, the drum 20 (first driving means 6) rotating at the first rotation speed is pressed against the tire T with a predetermined load F. As a result, the tire T is rotated under a load and at the first rotation speed.

In the uniformity measurement step, the uniformity of the tire T is measured by the first sensor S1 in the state of the first rotation step.

Although the particularly preferable embodiments of the present invention have been described in detail above, the present invention is not limited to the illustrated embodiments and can be modified into various embodiments.

1 Measuring device 2 Spindle 3 1st spindle 3C Flange 4 2nd spindle 8 Spindle upper end attachment / detachment means 9U, 9L Rim 11 Insertion hole 30 Holding shaft 31 Lifting platform 32 Sleeve 37 Protrusion 38 Connection recess 40 Spindle suspension 41 Grip piece 41A Locking groove j Axial center

Claims (4)

It can be divided into a first spindle part that supports the upper rim and a second spindle part that has an insertion hole that inserts and holds the first spindle part concentrically and integrally and rotatably and supports the lower rim. It is a measuring device for dynamic balance and uniformity of tires equipped with various spindles.
A spindle suspender capable of suspending the first spindle portion and inserting it into the insertion hole,
It is equipped with a spindle upper end attachment / detachment means that can be connected to the upper end of the spindle at the time of uniformity measurement and can be disconnected from the connection at the time of dynamic balance measurement.
The upper end portion of the spindle has a flange portion that projects in the circumferential direction and a tapered cone-shaped connecting recess that extends concentrically downward.
The spindle upper end attachment / detachment means includes an elevating table that can move up and down, a sleeve that is rotatably supported by the elevating table, and is rotatably held in an inner hole of the sleeve and fitted with the connection recess at the lower end. Equipped with a holding shaft provided with a tapered cone-shaped protrusion that can be fitted,
The spindle suspender has a pair of gripping pieces that are supported by the lifting table and can be moved apart in the radial direction toward the axis of the spindle, and the gripping pieces approach each other to move between the gripping pieces. A tire dynamic balance and uniformity measuring device, which comprises locking the flange portion. Each of the gripping pieces is provided with a locking groove that opens in a V shape toward the axial center, and the outer periphery of a portion of the first spindle portion below the flange portion is sandwiched between the locking grooves. The device for measuring the dynamic balance and uniformity of a tire according to claim 1. The measurement of the dynamic balance and uniformity of the tire according to claim 1 or 2, wherein the spindle suspender includes a cylinder that is attached to the lift and moves the grip piece toward the axis. apparatus. The device for measuring the dynamic balance and uniformity of a tire according to any one of claims 1 to 3, wherein the outer peripheral surface of the protrusion has an inclination angle θ with respect to the axial center of 15 to 45 degrees.

Images