JP7029800B2 - Tire holding device - Google Patents

Description

The present invention relates to a tire holding device that holds a tire for a dynamic balance test.

The tire holding device disclosed in Patent Document 1 below includes a rotating shaft extending vertically, a lower unit attached to the rotating shaft, and an upper unit arranged above the lower unit. Tires are held by being laid down and sandwiched between the lower rim of the lower unit and the upper rim of the upper unit. The rim width between the lower rim and the upper rim can be changed by displacing the lower or upper unit up and down with respect to the axis of rotation.

Japanese Patent No. 3974598

In the tire holding device disclosed in Patent Document 1, when it is desired to change the rim width beyond the vertical movable range of the lower unit, it is necessary to replace the lower rim and the upper rim with an upper and lower rim set having different width dimensions. Therefore, it is necessary to have multiple rim sets, and it takes time to replace a large part called the rim set.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a tire holding device capable of increasing the range of change of the rim width without exchanging the rim assembly.

The present invention has a lower rim (22) and an upper rim (15) facing the lower rim from above, and sandwiches a tire (T) that is laid down and inflated between the lower rim and the upper rim. The tire holding device (8) held by the lower support portion (21) that supports the lower rim with adjustable height within a predetermined range, and the upper rim that can be connected to the lower support portion. A tire holding device comprising an upper support portion (14) for supporting the upper rim and a shim (30) for changing the height position of the upper rim by being attached to and detached from the upper rim and the upper support portion. be. The alphanumerical characters in parentheses represent the corresponding components and the like in the embodiments described later.

According to this configuration, the rim width between the lower rim and the upper rim can be changed by adjusting the height of the lower rim within a predetermined range. Furthermore, if the height position of the upper rim is changed by attaching and detaching a shim between the upper rim and the upper support portion, the lower rim and the upper rim can be changed without replacing the lower rim and the upper rim with a rim set having a different width dimension. The rim width can be changed beyond a predetermined range. Therefore, it is not necessary to have a plurality of rim sets, and the range of changing the rim width can be increased simply by attaching and detaching a small and light shim.

FIG. 1 is a schematic view of a dynamic balance tester provided with a tire holding device according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the tire holding device and the tire. FIG. 3 is a vertical sectional view of a tire holding device equipped with a shim. FIG. 4 is a vertical cross-sectional view of the tire holding device from which the shims have been removed.

Hereinafter, embodiments of the present invention will be described in detail. The dynamic balance tester 1 shown in FIG. 1 includes a base 2 fixed to a floor surface X, a first vertical frame 3 and a second vertical frame 4 extending upward from the base 2, and a first vertical frame 3 to a second. An arm 5 extending horizontally toward the vertical frame 4, a rotating shaft 7 elastically supported by the first vertical frame 3 via a spring 6 and rotating around the vertical axis J, a tire holding device 8, and a second vertical frame. Includes a lifter 9 supported by 4.

The arm 5 is supported by a first vertical frame 3 via a linear guide 11, and slides vertically by receiving a driving force of a motor (not shown), for example, via a ball screw mechanism (not shown). .. The lifter 9 also slides vertically like the arm 5.

The tire holding device 8 includes an upper unit 12 supported by an arm 5 and a lower unit 13 attached to a rotating shaft 7. The upper unit 12 has a cylindrical upper support portion 14 and an annular upper rim 15 attached to the upper end of the upper support portion 14 by bolts or the like. In the upper support portion 14, a plurality of through holes 14A penetrating the upper support portion 14 in the radial direction are formed side by side in the circumferential direction of the upper support portion 14. On the lower surface of the upper rim 15, a plurality of annular rim surfaces 15A are formed vertically arranged in a staircase pattern. The upper unit 12 is suspended from the arm 5 by hooking the lower end portion 16A of the pair of claw portions 16 extending downward from the tip end portion of the arm 5 to the edge of the center hole 12A on the upper surface of the upper unit 12.

The lower unit 13 includes a lower support portion 21 and an annular lower rim 22 supported by the lower support portion 21. The lower support portion 21 has a cylindrical male member 23 coaxially fixed to the upper end portion of the rotation shaft 7, and a cylindrical female member 24 fitted externally to the lower portion of the male member 23. .. With reference to FIG. 2, the male member 23 is formed with an annular groove 23A extending downward from the upper surface thereof. In the cylindrical portion surrounded by the annular groove 23A in the male member 23, the same number of insertion holes 23B as the through holes 14A are formed side by side in the circumferential direction S around the vertical axis J, and the chuck claws 25 are formed in each insertion hole 23B. It is inserted one by one. Each chuck claw 25 can move along the radial direction R of the male member 23 in conjunction with the operation of an air-driven piston (not shown) in the male member 23. In the lower portion of the outer peripheral surface of the male member 23, rows formed by flange-shaped male side engaging portions 23C arranged vertically at equal intervals are provided at equal intervals in the circumferential direction S.

On the inner peripheral surface of the female member 24, rows formed by flange-shaped female side engaging portions 24A arranged vertically at equal intervals are provided at equal intervals in the circumferential direction S. The lower rim 22 faces the upper rim 15 from the lower side in a state of being fitted outward to the upper end portion of the female member 24. On the upper surface of the lower rim 22, a plurality of annular rim surfaces 22A are formed vertically arranged in a staircase pattern. In the lower support portion 21 in the normal state, each female side engaging portion 24A is at the same position as one of the male side engaging portions 23C in the circumferential direction S according to the size of the tire T to be tested, and engages with each other in the vertical direction. By mating, the male member 23 and the female member 24 are positioned in the vertical direction, and the height position of the lower rim 22 is fixed. By engaging the positioning pin (not shown) extending inward in the radial direction R from the female member 24, the male member 23 and the female member 24 are positioned in the circumferential direction S as well. There is.

When conducting a dynamic balance test of the tire T, the tire T is laid horizontally and set with respect to the lower rim 22 from above, and the upper unit 12 is lowered from the standby position of FIG. 1 to the fixed position of FIG. When the upper unit 12 descends to a fixed position, the upper support portion 14 of the upper unit 12 is inserted into the annular groove 23A of the male member 23 of the lower unit 13. At this time, the upper bead portion TB of the tire T is fitted to any rim surface 15A of the upper rim 15, and the lower bead portion TB of the tire T is fitted to any rim surface 22A of the lower rim 22. The tire T is sandwiched and held between the upper rim 15 and the lower rim 22.

After the upper unit 12 is lowered, in the male member 23, each chuck claw 25 moves outward in the radial direction R in conjunction with the operation of the piston described above, and one in the through hole 14A of the upper support portion 14. Since they enter one by one, the upper support portion 14 is connected to the lower support portion 21 of the lower unit 13, and the upper unit 12 and the lower unit 13 are integrated. Next, the air from the air supply path (not shown) in the male member 23 is supplied into the tire T through the annular groove 23A of the male member 23, so that the tire T is inflated.

After inflating, the upper unit 12 is separated from the arm 5 by narrowing the distance between the pair of claws 16 of the arm 5 and disengaging the lower end portion 16A from the edge of the center hole 12A of the upper unit 12. In this state, the rotating shaft 7 rotates by receiving the driving force of the motor 27 (see FIG. 1) provided on the base 2, for example, by the belt 28 (see FIG. 1), and the tire T, the upper unit 12, and the lower unit are rotated. 13 and 13 rotate integrally with the rotating shaft 7. The vibration generated at this time is detected by the pickup 29 (see FIG. 1) provided on the spring 6. In the dynamic balance tester 1, the dynamic imbalance of the tire T is calculated based on the detected vibration value. After that, after the rotation of the rotation shaft 7 is stopped and the chuck claw 25 is retracted from the through hole 14A of the upper support portion 14, the upper unit 12 is hooked by the pair of claw portions 16 and rises to the standby position, and the tire T is raised. Will be removed.

When it is desired to change the rim width (the vertical distance between the rim surface 15A and the rim surface 22A at the same position in the radial direction R) in the tire holding device 8, first, the lifter 9 (see FIG. 1) is raised to female. The member 24 is supported from below. Next, by operating the actuator (not shown) provided on the lifter 9, the positioning pin described above is disengaged from the male member 23, so that the positioning of the male member 23 and the female member 24 in the circumferential direction S is released. To. Next, when the motor 27 is driven, the male member 23 rotates relative to the female member 24, and the male side engaging portion 23C of the male member 23 and the female side engaging portion 24A of the female member 24 are brought into contact with each other. The engagement is disengaged. In this state, the lifter 9 moves up and down with the female member 24 to change the height position of the lower rim 22.

When the motor 27 is driven and the male member 23 rotates in the reverse direction while the lower rim 22 is in the changed height position, the male side engaging portion 23C and the female side engaging portion 24A engage with each other. The rim 22 is fixed at the changed height position. After that, after the male member 23 and the female member 24 are positioned in the circumferential direction S by the engagement of the positioning pin, when the lifter 9 retracts downward from the female member 24, the following test can be performed by the dynamic balance tester 1. become. The height of the lower rim 22 can be adjusted within a predetermined range (for example, within a height range of 5.25 inches) in which the male side engaging portion 23C and the female side engaging portion 24A can be engaged. The rim width can be changed by adjusting the height of the lower rim 22.

The tire holding device 8 further includes the shim 30 shown in FIG. The shim 30 is an annular body and is attached / detached between the upper rim 15 and the upper support portion 14. FIG. 3 shows a state where the rim width is the minimum. The upper rim 15 may be divided into an outer peripheral portion 15B provided with a rim surface 15A and an inner peripheral portion (rim ring) 15C, or the outer peripheral portion 15B and the inner peripheral portion 15C may be integrally formed. .. The same applies to the lower rim 22. The shim 30 in the mounted state has an inner upper surface 15D lowered by one step in the inner peripheral portion 15C having a substantially L-shaped vertical cross section, and an annular flange portion protruding outward in the radial direction at the upper end portion of the upper support portion 14. It is sandwiched from above and below by the lower surface 14B. The shim 30 is also sandwiched from the radial direction R by the upper support portion 14 and the inner peripheral portion 15C. The inner peripheral portion of the shim 30 is inclined inward in the radial direction R along the upper outer peripheral surface of the upper support portion 14 and the lower inner peripheral surface of the inner peripheral portion 15C, and protrudes below the inner upper surface 15D. The shim 30 may be fixed to the upper support portion 14 or the upper rim 15 by bolts or the like.

In the state of FIG. 3, only the upper support portion 14 is once raised to remove the shim 30, and then the upper support portion 14 is lowered. As shown in FIG. 4, the lower surface 14B of the upper support portion 14 and the inner upper surface of the inner peripheral portion 15C are formed. Contact with 15D. As a result, the upper rim 15 shifts upward by the thickness of the shim 30 (for example, 1 inch) with respect to the upper support portion 14, and the range of change in the rim width is changed from the initial 5.25 inches to 6.25 by that amount. Expand to inches. In this case, the rim width can be changed beyond the predetermined range described above without replacing the upper rim 15 and the lower rim 22 with rim sets having different width dimensions. Therefore, the range of use of the rim width can be expanded simply by attaching and detaching the small and light shim 30 without exchanging the upper and lower rims as a set.

When replacing the rim assembly of the upper rim 15 and the lower rim 22, first, the upper support portion 14 of the upper unit 12 is inserted into the annular groove 23A of the male member 23 of the lower unit 13 (see FIG. 2). ), The claw portion 16 of the arm 5 is retracted from the upper unit 12. Then, after the male member 23 is disengaged from the male side engaging portion 23C and the female member 24 is disengaged from the female side engaging portion 24A by driving the motor 27, the upper unit 12 and the female member 24 are lifted by the lifter 9. It is separated from the male member 23 upward. Then, if another upper unit 12 and a female member 24 are attached to the male member 23, the replacement of the rim assembly is completed.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

8 Tire holding device 14 Upper support part 15 Upper rim 21 Lower support part 22 Lower rim 30 Sim T tire

Claims (1)

A tire holding device having a lower rim and an upper rim facing the lower rim from above, and holding a tire that is laid down and inflated by being sandwiched between the lower rim and the upper rim.
A lower support portion that supports the lower rim so that the height can be adjusted within a predetermined range, and
An upper support portion that can be connected to the lower support portion and supports the upper rim,
It includes a shim that changes the height position of the upper rim by being attached and detached between the upper rim and the upper support portion.
The shim in the mounted state has a portion sandwiched by the upper rim and the upper support portion from both the vertical direction and the radial direction, and a portion protruding downward from this portion and sandwiched from the radial direction by the upper rim and the upper support portion. A tire holding device , including an inner peripheral portion .

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