JPH0545547U - Tire flat spot generator - Google Patents

Abstract

(57) [Summary] [Purpose] To generate a flat spot phenomenon of a tire on a trial basis with a simple structure. [Structure] A shaft hole 2 is provided in a pair of columns 20 standing on the grounding stand 10.
1 and the pin hole 22 are provided, and the rod of the jack 30 arranged inside the support column 20 is suspended via the adjustment pin 35 inserted into the pin hole 22. The test tire is placed on the grounding base 10, the flange 51 is fixed to the rim of the tire with bolts, and the shaft 50 having both ends inserted through the shaft holes 21 of the support column 20 is inserted into the flange 51. After adjusting the height of the jack 30 to the same position with the adjusting pin 35,
The jack 30 is activated to apply a vertical load to the tire via the shaft 50. Whether or not the set amount of flexure is evenly generated horizontally on the tire is detected by the digital scale 40 attached to the column 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an apparatus for easily producing a flat spot of a tire on a trial basis.

[0002]

[Prior Art]

 A flat spot on a tire is a phenomenon in which if the tire is subjected to a load and left in a deformed state, it remains deformed even after unloading and the original shape is not restored. No dedicated device has been proposed at this time for experimentally generating the flat spot phenomenon of the tire and measuring the amount of deflection and other performances.

Therefore, conventionally, a general tire performance testing machine has been used as an apparatus for generating a flat spot of a tire.

[0004]

[Problems to be solved by the device]

 As the tire performance tester described above, for example, the one described in JP-A-62-42029 is known, but these conventional testers are usually large in size and small in the number of installed machines, and these tests are If the machine is occupied by the tire flat spot phenomenon generation test, the original characteristic test cannot be performed at all during that time, and the number of test tires that can be processed is limited. However, it has the drawback of being extremely inefficient.

The present invention solves the above problems and provides a flat spot generation device for a tire, which is a small and simple mechanism, in which the amount of bending can be set horizontally and accurately, and which is easy to handle. With the goal.

[0006]

In order to achieve the above object, the tire flat spot generation device of the present invention is attached to a rim-assembled tire through a flange that is detachably fixed to the rim. A shaft, a grounding stand on which the tire is grounded, a pair of support columns that are provided upright on the grounding stand, and that have axial holes that are inserted through both ends of the shaft and movably supported in the vertical direction; It is composed of load means for applying a vertical load to both ends from the same height position above, and displacement detection means for measuring the amount of vertical displacement of the shaft.

[0007]

[Action]

 Place the rim-assembled test tire on the grounding base, fix the flange on the rim of this tire, and insert both ends of the shaft attached to the flange into the shaft holes of the support columns to support it. By actuating the load means, a uniform vertical load is applied to both ends of the shaft from the same height position to cause a predetermined amount of bending of the tire. Whether or not the load applied to the tire via the shaft by the load means is even and horizontal and the set deflection amount is checked by the shaft displacement detection means.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of the flat spot generation device of the present invention. The grounding base 10 attached to the reinforcing member is a trolley type in which a fixed wheel 11 and a free wheel 12 are provided in pairs, and a pair of right and left columns 20 are erected on the grounding base 10. is there. The pillar 20 has a hollow square cross section, and has shaft holes 21 penetrating through the opposite side surfaces, and a plurality of pin holes 22 are formed at the same height and at the same intervals on the upper portion of the front and back surfaces. A shaft 50 inserted into a flange 51, which will be described later, can be inserted into the shaft hole 21 of the column 20.

Inside each of the columns 20, a jack 30 is arranged as a load means. The jack 30 is a manual type equipped with a handle 31 and is suspended around an upper end as a fulcrum by an adjusting pin 35 which is inserted into a hole formed in a rod (not shown) and a pin hole 22 of each column 20. However, it can be moved up and down inside each column 20. The rod of the jack 30 is supported by the support plate 32.

Further, a digital scale (commercial name linear scale) 40 is attached to the front surface of each of the columns 20 as a vertical displacement detecting means of the shaft 50. In this digital scale 40, the movement amount of the detection plate 42 is transmitted to the measurement unit 41 by the measurement unit 41 equipped with the detection plate 42 sliding along the guide plate 43 by its own weight, and the measurement unit 41 is informed. It is a digital display.

When using the flat spot generator having the above structure, as shown in FIG. 2, the test tire 60 having the rim assembled thereon is mounted on the grounding base 10 of the flat spot generator, and the rim 61 of the tire 60 is mounted on the rim 61. After fixing the flange 51 with the bolts 62, the shaft 50 inserted from the one column 20 into the shaft hole 21 of the other column 20 is inserted into the flange 51. As a result, the shaft 50 mounted coaxially with the tire 60 is supported in the shaft hole 21 of the support column 20 so as to be vertically movable.

Then, with the bottom surface of the jack 30 in contact with the upper surface of the shaft 50, the height of the jack 30 is adjusted to the radius of the tire 60, and the jack holes are provided through the pin holes 22 at the same height on the left and right sides. The adjusting pin 35 is inserted into the rod of 30. In this state, the measuring unit 41 of the digital scale 40 is lifted up to the uppermost end of the guide plate 43, and after the left and right instructions are matched, the detection plate 42 is lowered and brought into contact with the upper surface of the shaft 50. As a result, the detection plates 42 of the left and right digital scales 40 are set at the same height position from the ground base 10.

After the above preparatory work is completed, the handle 31 of the left and right jacks 30 is rotated by the same person by the same number of rotations with the left and right hands, a vertical load is applied to the tire 60 via the shaft 50, and a predetermined amount of force is applied. Causes bending. Since the amount of this flexure is displayed as a digital value on the measuring units 41 of the left and right digital scales 40, it is easy to confirm whether or not a uniform vertical load is applied to both ends of the shaft 50 and the flexure occurs horizontally. You can

The tire with the flat spot thus generated is removed from the generator as quickly as possible, and then mounted on a well-known uniformity tester or the like, and the deformed portion of the tire is used as a load fluctuation value during rolling. By obtaining it, use it as an indicator of the amount of flat spots. After the flat spot is generated, the amount of residual deflection when the load is removed can be read by the digital scale 40 and used as an index of the flat spot.

The above-mentioned flat spot generation device is also capable of generating a flat spot under conditions close to that of an actual vehicle by loading the tire under test into a constant temperature and humidity chamber such as an oven heating chamber while keeping a load applied. is there. In the above flat spot generator, the outer diameter of the tire 60 is set to 200 mm to 800 mm and the width of the tire 60 is set to 100 mm to 500 mm by appropriately selecting the mutual distance between the columns 20 and the vertical dimension of the shaft hole 21. It can be applied to various tires 60 having different sizes and types. In this case, it is desirable to prepare the size (diameter) of the flange 51 that corresponds to each tire 60.

Since the load means of the above-mentioned embodiment uses the jack 30, it is possible to apply a maximum load of 1500 kgf only by human hand. However, the load means is not limited to the jack, and a hydraulic or air driven cylinder, a speed reducer or the like may be used. Further, since the shaft displacement detecting means in the above embodiment is the digital scale 40, the vertical displacement of the shaft 50 can be accurately measured with the accuracy of 0.1 mm. However, also for the displacement detecting means, a potentiometer, a capacitance type differential transformer, a laser or the like can be used instead of the digital scale 40.

The flat spot generation device of the above-mentioned embodiment is configured as a trolley type that can travel, but may be configured as a stationary type that does not have wheels if necessary.

[0018]

[Effect of the device]

 As described above, the flat spot generator for a tire according to the present invention has a very simple structure and a small size, and can generate the flat spot phenomenon of a tire by a simple operation. The problem of occupying the tire characteristic tester for a long time will be solved.

Further, according to this invention, since the amount of bending of the tire caused by the load applied to both ends of the shaft by the load means can be measured by the displacement detecting means of the shaft, the horizontal bending amount can be measured. And accurate setting is possible. Furthermore, according to the present invention, the test tire can be attached and removed to and from the flat spot generator safely and easily, so that not only the operation time can be shortened, but also the test tire can be Regardless of small size, various sizes can be tested with equipment of the same size, and tires loaded with this equipment are loaded into the constant temperature and humidity chamber together with the equipment, and under the same conditions as the actual vehicle. It is possible to obtain the effect that a flat spot generation device can also be used.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a flat spot generation device of the present invention.

FIG. 2 is a front view showing a usage state of the flat spot generator of the present invention.

[Explanation of symbols]

 10 Grounding Base 20 Strut 21 Shaft Hole of Strut 30 Jack 40 Digital Scale 50 Shaft 51 Flange 60 Tire

Claims (1)

[Scope of utility model registration request] 1. A shaft attached to a rim-assembled tire via a flange that is detachably fixed to the rim, a grounding base on which the tire is grounded, and an upright installation on the grounding base. A pair of stanchions provided with shaft holes whose both ends are movably supported in the vertical direction, load means for applying a vertical load to the both ends of the shaft from the same height position above, and displacement of the shaft in the vertical direction. A flat spot generation device for a tire, comprising: a displacement detection means for measuring an amount.