JP3798517B2 - Tire testing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tire testing machine, and more particularly, to a tire testing machine capable of measuring various performances of a tire on a low-temperature ice / snow surface in a cold region.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, various tire testing machines for measuring various performances of tires have been proposed and actually used, but most of them are performed by pressing the tire against a metal rotating drum or the like. It was a thing.
[0003]
On the other hand, in recent years, studless tires have attracted attention due to problems with spiked tires and the like, but conventional tire testing machines have not been able to reliably measure the performance of this type of tire on ice and snow.
[0004]
Therefore, an object of the present invention is to provide a tire testing machine capable of easily measuring various performances of a tire on an icy and snowy surface.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the tire testing machine according to claim 1 is configured to be rotatable and provided with a flange portion wider than the tire on the outer peripheral edge of a disk having a flat surface on the upper surface. And a turntable having an ice / snow surface on the upper surface of the disk on the inner circumference side, and a tire holding portion that holds the tire rotatably, and the tire holding portion is formed to be movable in the radial direction of the turntable. Tire pressing means for pressing the tire against the ice / snow surface with a predetermined pressing force, tire steering means for adjusting a rolling direction of the tire with respect to a tangential direction of the turntable, and a tire for rotating the tire at a predetermined rotational speed And a driving means.
[0006]
According to the said structure, a tire can be rotated on an ice-snow surface, and the various performance tests of the tire with respect to an ice-snow surface can be performed.
In addition, by providing a collar on the outer periphery of the turntable, various adjustments can be made before the tire is actually rotated on the snow and ice surface, making it more accurate than when the tire is placed directly on the snow and ice surface. It can be performed.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show an embodiment of a tire testing machine according to the present invention. FIG. 1 is a side view showing a tire holding part of the tire testing machine, and FIG. FIG. 3 is a plan view of the turntable.
[0008]
First, a tire holding portion 2 that holds a tire 1 is a movable frame that is installed on a guide rail 4 of a base 3 fixed on the floor so as to be movable in the radial direction of the turntable 5, that is, in the left-right direction in FIG. 6 is supported.
[0009]
Tire driving means 7 for driving the tire 1 is provided on the rear side (counter turntable side) of the movable frame 6, and tires are mounted on the front side (turntable side) of the movable frame 6. A spindle 8 for rotatably holding the tire 1 via a rim (not shown), a tire pressing means 9 for pressing the tire 1 downward with a predetermined pressing force via the spindle 8, and the spindle 8 A tire steering means 10 that adjusts the rolling direction of the tire 1 by changing the direction of the axis is integrally combined.
[0010]
The tire driving means 7 is composed of a motor 11, a speed reducer 12, a clutch part 13, a brake 14, and the like, and is connected to the rotating shaft of the spindle 8 by a drive shaft 15 provided with constant velocity joints at both ends. Has been.
[0011]
The spindle 8 is provided in a state of being suspended below the tip of a portal frame 16 standing on the movable frame 6, and is moved up and down along a guide portion 16 a provided in the portal frame 16. Support is provided via an elevating frame 17 that can be provided, a steering shaft 19 that is rotatably supported by a bearing member 18 of the elevating frame 17, and an L-shaped frame 20 that is provided at the lower end of the steering shaft 19. Has been.
[0012]
Further, a pressing hydraulic cylinder 21 for pressing the elevating frame 17 downward is provided at the distal end portion of the portal frame 16. The elevating frame 17 has an L-shaped frame 20 centered on the steering shaft 19. Is provided with a steering hydraulic cylinder 22. Further, a load cell 23 for detecting a pressing force, that is, a load applied to the tire 1, is provided between the pressing hydraulic cylinder 21 and the lifting frame 17, and between the lifting frame 17 and the L-shaped frame 20. Is provided with a position sensor 24 for detecting the angle of the L-shaped frame 20, that is, the rolling direction (slip angle) of the tire 1.
[0013]
One turntable 5 is provided with a flange 53 wider than the tire 1 on the outer peripheral edge of a disk 52 that rotates about a rotation shaft 51, and on the upper surface of the disk on the inner peripheral side from the flange 53. It is formed so as to be filled with snow and ice 54. Further, the turntable 5 may be provided with a refrigerant tube, a cold insulating material, and a heat insulating material for keeping the filled snow and ice cold.
[0014]
When measuring the performance of the tire 1 on the ice / snow surface using this tire testing machine, first, the turntable 5 is filled with snow, or water is injected to flow the refrigerant into the refrigerant pipe and freeze it. To create a predetermined road surface condition. Note that the temperature of the entire test chamber in which the tire testing machine is installed may be lowered.
[0015]
When a predetermined ice / snow surface is formed on the turntable 5, the tire driving means 7 is operated to rotate the tire 1 at a predetermined speed, and the turntable 5 is also rotated at a predetermined speed by a driving device (not shown). Next, after the movable frame 6 is advanced so that the tire 1 becomes a portion of the flange portion 53 of the turntable 5, the pressing hydraulic cylinder 21 is operated to press the tire 1 against the flange portion 53.
[0016]
After driving for a while in this state and adjusting the speed of the tire 1 and the turntable 5, the load of the tire 1, the slip angle of the tire 1, etc., the movable frame 6 is advanced at a predetermined speed to bring the tire 1 onto the ice and snow surface. Place it and move it from the outer peripheral side toward the inner peripheral side. And the state of the tire 1 at this time is measured with various measuring devices or visually, for example, by measuring the stress in the rotation axis direction of the tire 1 with a load cell built in the spindle 8, the performance of the tire 1 with respect to the ice / snow surface is improved. Can be measured.
[0017]
In addition, by moving the movable frame 6 forward at a predetermined speed to advance the tire 1 spirally toward the inner periphery of the turntable 5, the tire 1 can always be rotated on the ice / snow surface formed under predetermined conditions. It is possible to reliably measure the performance of the tire 1 against ice and snow surfaces under specific conditions. Note that the means for moving the movable frame 6 forward is arbitrary, and a hydraulic cylinder, a motor, or the like may be used.
[0018]
Furthermore, by providing the flange 53 on the outer periphery of the turntable 5, various adjustments can be made before the tire 1 is actually rotated on the ice / snow surface, compared with the case where the tire 1 is directly placed on the ice / snow surface. Accurate measurement.
[0019]
During the above test, the clutch portion 13 of the tire driving means 7 is turned off and the braking force can be applied to the tire 1 with the brake 14, or the speed of the tire 1 and the turntable 5 can be changed, thereby changing the slip angle and the load. You can also. Furthermore, either the tire 1 or the turntable 5 can be driven and the other can be in a free state.
[0020]
Note that the configuration of each part is not limited to the above-described embodiment, and can be appropriately configured in an optimal shape and combination according to the size of the tire to be tested, measurement items, and the like.
[0021]
【The invention's effect】
As described above, according to the tire testing machine of the present invention, it is possible to easily and reliably measure various performances of a tire on an icy and snowy surface.
[Brief description of the drawings]
FIG. 1 is a side view of a tire holding portion showing an embodiment of a tire testing machine of the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a plan view of a turntable.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tire, 2 ... Tire holding part, 5 ... Turntable, 6 ... Movable frame, 7 ... Tire drive means, 8 ... Spindle, 9 ... Tire pressing means, 10 ... Tire steering means, 11 ... Motor, 13 ... Clutch part , 17 ... Elevating frame, 18 ... Bearing member, 19 ... Steering shaft, 20 ... L-shaped frame, 21 ... Hydraulic cylinder for pressing, 22 ... Hydraulic cylinder for steering, 51 ... Rotating shaft, 53 ... Butt

Claims (1)

  A turntable provided with a flange that is wider than the tire on the outer peripheral edge of a disk that is rotatable and has a flat surface on the upper surface, and an ice / snow surface on the disk upper surface on the inner periphery side of the flange, and a tire A tire holding portion for rotatably holding the tire, and forming the tire holding portion so as to be movable in a radial direction of the turntable, and pressing the tire against the ice and snow surface with a predetermined pressing force. A tire testing machine comprising: means; tire steering means for adjusting a rolling direction of the tire with respect to a tangential direction of the turntable; and tire driving means for rotating the tire at a predetermined rotational speed.

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