JP2007124730A - Parts of pantagraph - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide parts of a pantagraph excellent in electric insulation, weatherability, and abrasion resistance by substituting an upper frame collar made of ultrahigh molecular weight polyethylene for a conventional upper frame collar made of, for example, aluminum. <P>SOLUTION: Ultrahigh molecular weight polyethylene (UHMWPE) is used for a collar, a bush, and a roller which are used for points having risk of current application or leakage, being parts of a pantagraph. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a part of a pantograph, and more particularly to an improvement of a part used in a place where there is a risk of energization or leakage, particularly an upper frame tube collar.

Pantographs use parts such as collars, bushes, and rollers for the purpose of maintaining dimensions and reducing wear during movement. Among these, the color used for the upper frame tube may cause dimensional deterioration due to electrolytic corrosion. With regard to pantographs, they are periodically removed (currently every 600,000 km travel) and are removed from the vehicle body for dismantling inspections, and worn or deteriorated parts are replaced. However, in recent years, with the growing need for labor saving of vehicle maintenance, it is required to extend the period of disassembling inspection of pantographs. In extending the inspection period of such pantographs, the aluminum upper frame tube color that generates electrolytic corrosion has been a limiting factor.
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  As described above, since pantograph components, for example, the upper frame tube collar are made of aluminum, there has been a problem in terms of electrical insulation.

  In view of the above situation, the present invention, for example, instead of the conventional upper frame tube color made of aluminum, the upper frame tube color is changed to ultra high molecular weight polyethylene to provide electrical insulation and weather resistance. -The object is to provide pantograph parts with excellent wear resistance.

In order to achieve the above object, the present invention provides
[1] Pantograph parts, characterized in that ultra high molecular weight polyethylene (UHMWPE) is used for collars, bushes, and rollers used in places where there is a risk of energization or leakage.

  [2] In the above-mentioned [1] pantograph component, the color is an upper frame tube color.

  According to the present invention, a pantograph part, for example, an upper frame tube collar made of ultrahigh molecular weight polyethylene can be made excellent in electrical insulation, weather resistance, and wear resistance.

  By making the pantograph part of the present invention, for example, the upper frame tube collar from aluminum to ultrahigh molecular weight polyethylene, it is excellent in electrical insulation and has a long period (1.2 million, which is twice the current inspection period as an immediate target). Provided is a pantograph component that can maintain good weather resistance and wear resistance so that it can be used in the vehicle.

  Hereinafter, embodiments of the present invention will be described in detail.

  1 is a perspective view of a pantograph showing an embodiment of the present invention, FIG. 2 is a perspective view showing a portion A (upper frame tube collar) of FIG. 1, and FIG. 3 is a perspective view showing an apex hinge bush and an upper frame tube collar. It is.

  In these figures, 1 is a pantograph, 2 and 3 are apex hinge bushes located in the A portion of the pantograph 1, and 4 is an upper frame tube collar provided between the apex hinge bushes 2 and 3.

  The upper frame tube collar 4 is worn by sliding the end surface and the inner diameter surface. In addition, the length is reduced by electrolytic corrosion.

  Therefore, the upper frame tube color is changed to ultra high molecular weight polyethylene (UHMWPE) to provide a pantograph upper frame tube color excellent in electrical insulation, weather resistance, and wear resistance.

  Hereinafter, the test of the upper frame tube color according to the present invention will be described.

(1) Evaluation items The upper frame tube collar made of ultra-high molecular weight polyethylene was evaluated for durability against running equivalent to 1,200,000 km by durability test, and material evaluation tests such as weather resistance, wear resistance, and electrical resistance were performed. . The material evaluation test was conducted with nylon, which has been used as a pantograph component, and the performance of both was compared.

(2) Test piece A real color (made of ultra high molecular weight polyethylene) was used in the durability test. The weather resistance test piece was made into two types, a real size and a strip shape of about 10 mm × 50 mm × 2 mm. For the wear resistance test and the volume resistance test, a 120 mmφ × 2 mm disk-shaped test piece (6 mmφ through hole in the center) was used.

(3) Test method Regarding the endurance test, it was confirmed whether there was any abnormality during the test and the appearance after the test was visually examined, and the inner and outer diameters and the tube length were measured with calipers.

In the weather resistance test, a sunshine weatherometer SX120 (xenon lamp type, manufactured by Suga Test Instruments Co., Ltd.) was used and exposed to ultraviolet rays at an irradiation energy of 60 W / m ² for 2000 hours. After the exposure, a dynamic viscoelasticity test was performed on the strip-shaped test piece together with a visual appearance inspection. The dynamic viscoelasticity test was performed using DMS110 (manufactured by Seiko Instruments Inc.) in a bending mode under the conditions of a temperature range of −50 to 120 ° C., a heating rate of 2 ° C./min, a frequency of 10 Hz, and a dynamic amplitude of 10 μm. The dynamic elastic modulus and loss factor tan δ were measured.

  In the abrasion resistance test, a taper abrasion test was performed using an abrasion tester T410 (manufactured by Toyo Seiki Co., Ltd.). The main conditions were a load of 15 N, a test frequency of 1000 times, a rotation speed of 60 rpm, and temperature conditions of −20 ± 2 ° C., 23 ± 2 ° C., and 50 ± 2 ° C.

  The electrical resistance test was performed by using a digital ultrahigh resistor R7240A [manufactured by Advantest Co., Ltd.] and measuring the volume resistance after energizing 500 V DC for 1 minute. The test was carried out in the normal state and after immersion in tap water at 50 ± 2 ° C. for 96 hours.

(4) Test results As a result of the durability test, no abnormalities such as scratches were observed on all the test pieces after the test. In addition, no significant differences were observed in the inner diameter, outer diameter, and pipe length.

  As a result of the weather resistance test, no abnormalities such as scratches were observed on the test piece after UV exposure.

  As a result of the material evaluation test, as shown in Table 1, in terms of flexural dynamic modulus at room temperature, both ultra-high molecular weight polyethylene and nylon have small changes from the initial value after exposure to ultraviolet rays, and other test items have extremely high values. It was recognized that the molecular weight polyethylene showed a better value than nylon.

  From the above results, it became clear that the upper frame tube collar made of ultra high molecular weight polyethylene has sufficient durability for traveling equivalent to 1.2 million km.

Also, ultra high molecular weight polyethylene is promising as a pantograph upper frame tube color because it is superior in weather resistance as compared with other polymer materials as an electrically insulating material and is low in cost.

  Note that the present invention is not limited to the above-described embodiments, and various modifications such as blending additives and polymer blending depending on the use site / location based on the gist of the present invention and optimizing required characteristics are possible. These are not excluded from the scope of the present invention.

  The upper frame tube color of the pantograph of the present invention is suitable for a pantograph for a high-speed railway.

It is a perspective view of the pantograph which shows the Example of this invention. It is a perspective view which shows the A section (upper frame pipe | tube color) of FIG. 1 which shows the Example of this invention. It is a perspective view which shows the top pinch bush and upper frame pipe | tube collar of the pantograph which show the Example of this invention.

Explanation of symbols

1 Pantograph 2, 3 Vertex Hinges Bush 4 Upper Frame Tube Color

Claims (2)

  A pantograph component, wherein ultra high molecular weight polyethylene (UHMWPE) is used for a collar, a bush, and a roller used in a place where there is a risk of energization or leakage.   2. The pantograph part according to claim 1, wherein the color is an upper frame color.