JP3796770B2 - Tire testing machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a tire testing machine that applies a compressive load, a torsion torque, or the like to a tire that is mounted on an automobile, an aircraft, or the like.
[0002]
[Prior art]
In a conventional tire testing machine, a tire mounting shaft is attached to the center of a tire with a rim, and both ends of the tire mounting shaft are fixed to a pair of vertically movable brackets provided on the testing machine to perform a compression test or the like. (See, for example, Japanese Utility Model Publication No. 64-7301).
[0003]
[Problems to be solved by the invention]
In the above-described testing machine, assembling the rim and the tire mounting shaft to the tire is necessary as a test preparation work, and the test efficiency is poor. Since it is necessary to load and unload tires with built-in rims and tire mounting shafts to / from the testing machine, it is necessary to proceed carefully using a crane, which also reduces test efficiency. . It was also difficult to evaluate the performance of only the tire by eliminating the difference between individual rims assembled to the tire.
[0004]
An object of the present invention is to provide a tire testing machine that can increase the test efficiency by omitting the labor required for the test setup and can easily evaluate the performance of only the tire.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 is applied to a tire testing machine, and a pair of tire support members arranged opposite to each other in the axial direction of a tire as a test body, and an axial direction drive means for contacting and separating the pair of tire support members in the axial direction. And a radial drive means for contacting and separating the pair of tire support members and the test jig in the radial direction of the tire. The axial drive means includes a cylinder and a piston, and the cylinder and the piston are tire support members. built in, the opposing portions of the pair of tire support member, the the joint portion of seaming a pair of tire support member into a single beam-shaped with the approaching operation to said axial direction, a rim adapted to the tire The above-described object is achieved by providing a rim holding portion that holds a pair of divided rims divided in the axial direction.
[0006]
[Action]
The split rim is held by the rim holding portion of the tire support member, and a tire without a rim is carried between the split rims. Subsequently, the pair of tire support members are brought close to each other and the tire is sandwiched between the divided rims. The air pressure in the tire is adjusted as necessary, and a predetermined load is applied to the tire by bringing the tire support member and the test jig closer to each other by the radial driving means. A pair of tire support members supported in a cantilever state are joined to each other by their joint portions, and the flexures on the respective free ends are mutually restricted. After the test is completed, the tire is removed from the tire support member in the reverse procedure as described above. The split rim can be shared among a plurality of tires, and it is not necessary to remove the tire rim removed from the testing machine and attach it to the next tire.
[0007]
【Example】
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 schematically shows a tire testing machine according to the present embodiment, where 1 is a bed horizontally installed on a floor surface or the like, and 2 is a pair of columns vertically installed on the bed 1. A pair of screw rods 3 are attached to the inside of the column 2 so as to be rotatable about an axis in the vertical direction. The rotation is transmitted from the motor 4 through the chain 5 to each screw rod 3. A ram cylinder 6 that moves up and down by hydraulic pressure is disposed at the center of the bed 1, and a table 7 and a test jig 8 are provided at the upper end of the piston rod 6 a. The test jig 8 includes a mechanism for linearly moving the cradle 8a at the upper end in an appropriate direction within the horizontal plane (for example, the horizontal direction in FIG. 1 and the direction orthogonal to the paper surface), and the cradle 8a with the axis AX And a mechanism for swiveling around.
[0008]
Nuts (not shown) are screwed into the left and right screw rods 3, and these nuts are fixed to the tire support shafts 10 and 20, respectively. The left tire support shaft 10 is enclosed in a housing 11 to which the nut is fixed, a movable shaft 12 slidably inserted into a horizontal fitting hole 11 a of the housing 11, and a cylinder 12 a in the movable shaft 12. And a piston 13 to be operated. A rod 13 a is integrally attached to the piston 13, and the left end of the rod 13 a is fixed to the housing 11. Fluid pressure (hydraulic pressure or pneumatic pressure) can be supplied from a fluid pressure control circuit (not shown) to the head chamber 12b and the rod chamber 12c of the cylinder 12. A rim holding portion 12d that fits coaxially with the left split rim 30L is formed at the distal end of the movable shaft 12 (the right end in the figure), and a tapered hole 12e and a tapered hole 12e and a rim holding portion 12d are formed inside thereof. A through hole 12f connecting the outer periphery is formed. The fitting surface between the rim holding portion 12d and the left split rim 30L is sealed by the O-ring 14.
[0009]
A rim holding portion 20a is formed on the right tire support shaft 20, and a right split rim 30R is coaxially fitted to the outer periphery thereof. A tapered shaft 20b is formed coaxially at the tip of the rim holding portion 20a. The tapered shaft 20b can be fitted into the tapered hole 12e on the tire support shaft 10 side. An air introduction path 20c is formed inside the tire support shaft 20, and both ends thereof open to the outer periphery of the tire support shaft 20 on the base end side (connection side to the screw rod 3) and the outer periphery of the taper shaft 20b, respectively. When the taper shaft 20b is fitted with the taper hole 12e, the air introduction path 20c communicates with the through hole 12f. The fitting surface between the rim holding part 20a and the right split rim 30R is sealed by an O-ring 21. In addition, when attaching the tire holding shafts 10 and 20 to the screw rod 3, the screwing positions of the nuts to the left and right screw rods 3 are adjusted so that the rim holding portions 12d and 20a are coaxial. The left and right split rims 30L and 30R have a shape in which a rim that can be assembled to the tire TR to be tested is split in the axial direction. When it is necessary to replace the rim according to the type of the tire TR to be tested, the divided rims 30L and 30R can be replaced with respect to the rim holding portions 12d and 20a. When it is not necessary to replace the divided rims 30L and 30R, the rim holding portions 12d and 20a and the divided rims 30L and 30R may be integrally formed.
[0010]
Next, a test procedure for the tire TR using the above-described testing machine will be described with reference to FIG. First, as shown in FIG. 2A, fluid pressure is supplied to the rod chamber 12 c of the tire support shaft 12 to retract the movable shaft 12, and the tire TR is carried between the support shafts 10 and 20. It is not necessary to assemble a rim in advance on the tire TR. Subsequently, as shown in FIG. 2B, the right side portion of the tire TR is fitted to the right split rim 30 </ b> R, and then the fluid pressure is supplied to the head chamber 12 b to advance the movable shaft 12. As shown in FIG. 2 (c), when the movable shaft 12 is advanced until the tapered shaft 20b and the tapered hole 12e are fitted, the left divided rim 30L is assembled to the tire TR. Thereafter, compressed air is fed into the tire TR through the air introduction path 20c and the through hole 12f, and the air pressure in the tire TR is adjusted to a desired value. The tire TR mounting operation is thus completed. Thereafter, the screw rod 3 is driven to move the tire TR to a predetermined position during the test, and various tests are performed. As a type of test, for example, a simple compression test in which only a radial compression load is applied to the tire TR by the ram cylinder 6, and the cradle 8a is moved in the axial direction or the circumferential direction of the tire TR while applying the compression load to the tire TR. There are a lateral push or circumferential push test, a torsion test that rotates the cradle 8a while applying a compressive load to the tire TR, and the like. After completion of the test, the movable shaft 12 is moved backward to remove the tire TR from the left and right divided rims 30L, 30R. Thereafter, only the lightweight tire TR having no rim is carried out of the testing machine.
[0011]
In the above embodiment, the tire support shafts 10 and 20 are a pair of tire support members, the cylinder 12a and the piston 13 are axial drive means, the ram cylinder 6 is a radial drive means, and the tapered shaft 20a and the tapered hole 12e are. Each joint part is configured. Although only the left tire support shaft 10 can be expanded and contracted in the axial direction, the right tire support shaft 20 may also be expanded and contracted.
[0012]
【The invention's effect】
As described above, according to the present invention, since the rim is attached to and detached from the tire and the tire is attached to and detached from the testing machine by the advancing and retracting operation of the tire supporting member provided in the testing machine, the preparatory work before the test is omitted. Thus, the test can be performed with high efficiency. In addition, since the rim is not assembled to the tire that is carried into and out of the testing machine, the handling load at the time of carrying in and out can be reduced and the work can be easily performed. Since the rim is shared among a plurality of tires, it is easy to evaluate the characteristics of only the tires. Since the divided tire support members are joined to each other at the joint portion, even when testing a large tire that is heavy in weight, the deflection of the free end of the tire support member is mutually regulated, The test can be performed while the tire is stably supported in the same manner as in the case where the tire is supported by one inserted support shaft.
[Brief description of the drawings]
FIG. 1 is a front view of a tire testing machine according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a tire mounting procedure in the tire testing machine according to the embodiment.
[Explanation of symbols]
3 Screw rod 6 Ram cylinder 8 Test jig 10, 20 Tire support shaft 12a Cylinder 12e Tapered hole 13 Piston 20b Tapered shaft 30L Left split rim 30R Right split rim

Claims (1)

A pair of tire support members arranged opposite to each other in the axial direction of a tire as a test body, an axial drive means for moving the pair of tire support members in and out of the axial direction, the pair of tire support members and a test jig In the radial direction of the tire, the axial drive means includes a cylinder and a piston, and the cylinder and the piston are built in the tire support member, and the pair of tires A joint portion that joins the pair of tire support members into a single beam shape and a rim that fits the tire are divided in the axial direction at the opposing portion of the support member in accordance with the approaching operation in the axial direction. A tire testing machine comprising a rim holding portion that holds a pair of split rims.

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