JPS6258946B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a track sheet for slidingly supporting a track vehicle that is propelled by a linear motor or the like, and a track sheet that also serves as a power supply rail for supplying power to electrical equipment on the vehicle from the track side. . Conventionally, there have been proposed bearing materials in which the surface of a phenolic resin is coated with copper or the like, and bearing materials in which the surface of a sintered alloy is coated with a low melting point alloy. This has low impact strength, and the impact caused by high-speed sliding friction may cause cracks on the surface or the entire sheet may break.
It cannot be used as a high-speed slide track sheet material. SUMMARY OF THE INVENTION An object of the present invention is to provide a sliding track sheet that has a small coefficient of friction against high-speed sliding friction and that can also supply electricity if necessary. Magnetically levitating the vehicle has been considered for linear motor-propelled track vehicles, but even in the case of such magnetically levitated vehicles, an emergency slide is used to stably support the vehicle on the track side when the levitation force is lost. A trajectory is required. Furthermore, if the vehicle could be supported by sliding on the track surface at all times without using magnetic levitation support, equipment costs for the track and the vehicle body would be significantly reduced, which would be advantageous. Furthermore, it is desirable to supply power from the track side to equipment such as interior lighting, air conditioning, and on-board refrigerators, as well as a magnetic vibration prevention device for preventing vibration of the vehicle body. In order to solve these problems, the present invention has developed a sliding system that can stably support a vehicle at sliding speeds of up to about 500 km/h and can also supply electric power from the track surface to the vehicle side. This is a proposal for a track sheet. According to the present invention, a mesh material or a core material formed by knitting copper wire as a conductor and wires of nylon, polyester, etc. with high tensile strength has low friction, friction resistance, and electrical conductivity. A low melting point metal powder and a metal powder that is easily alloyed with the low melting point metal, has high thermal conductivity, and has vibration damping properties,
It is made by mixing and impregnating a binder that hardens at room temperature such as epoxy resin, hardening it at room temperature, and forming it into a sheet. It is characterized in that it is coated with a powder such as graphite that has low friction and electrical conductivity, and if it is used only for sliding purposes, it is coated with paraffin wax or the like. The mesh material in the runway sheet material serves as a tensile strength member, and in particular, copper wire, molybdenum wire, tungsten wire, etc. are used to supply electricity to the warp threads and maintain strength. Plain weave such as triple or quadruple.
The reason why copper wire is used for the warp is to supply electricity and to increase tensile strength, and the reason why copper wire is not used for the weft is to prevent the generation of eddy currents. Among mesh materials, polyester wire, which is mainly used for weft threads, has better thermal stability, abrasion resistance, self-lubricating properties, etc. than other synthetic resins, and is cheaper, and it also has better abrasion resistance than metal materials. ,
It has excellent seizure resistance and self-lubricating properties, so it provides stable wear resistance during high-speed sliding. Furthermore, it blends well with the impregnating material and provides integrity. Next, the impregnating material consists of a first group and a second group, and the metal powder belonging to the first group is alloyed at the interface with the alloy of the surface layer of the runway sheet material,
Helps conduct and dissipate frictional heat. Furthermore, it maintains the shape retention of the mesh material and acts to dampen vibrations on the track surface caused by the sliding of the vehicle. Second among impregnating materials
This is because the low melting point alloy powder belonging to the group improves the bonding with the low melting point alloy layer applied to the friction surface. The low melting point alloy (L metal) used here has a melting point of approximately 150 to 200°C or less, and the melting point is 40°C or less.
Temperatures around ~60°C are particularly suitable for surface coating materials, and are highly effective in lowering the coefficient of friction and improving electrical conductivity. The configuration of the present invention will be explained based on an example.
As shown in FIG. 1, a mesh material 13 is formed as a multiple plain weave such as a double weave or a triple weave with warp threads 15 and weft threads 14, and an impregnating material 16 is mixed with a binder and impregnated on the inside and outside of the mesh material 13. The track sheet 11 is constructed by curing and molding into a sheet, and coating the surface of the sheet with a powder having low friction to form a coating layer 12. The warp threads 15 constituting the mesh material 13 are (a) copper multifilament (7 strands twisted) (b) nylon wire, polypropylene wire, or polyester wire (c) copper wire, or tungsten wire or molybdenum wire coated with copper (d) Aluminum wire, tungsten wire coated with aluminum, or molybdenum wire (e) A wire obtained by twisting the above (b) and (c) or (b) and (d) is used. As the weft threads 14 constituting the mesh material 13, polyester filaments, carbon multifilaments, or wires made by twisting these together are used. Then, the warp threads 15 and the weft threads 14 are knitted as a double, triple or quadruple plain weave to form the mesh material 13. A conductive wire made of copper or aluminum, which also serves as a power supply line, is woven into the warp threads 15 of the mesh material. Next, for the impregnating material 16, a material is selected that is easily alloyed at the interface with the alloy of the track sheet surface layer, has high thermal conductivity, and has a vibration damping effect on the vehicle. The first group having this effect includes at least one of copper, kelmet, bismuth, aluminum, tin, antimony, indium, lead, and iron powder.
Seeds are used. When a mixture of several types is used, mixtures of copper and aluminum, mixtures of copper, aluminum, lead and kelmet, and mixtures of copper, aluminum and tin are particularly suitable. The second group of impregnated materials 16 is integrated with the alloy of the surface layer of the track sheet, exhibits low friction and low abrasion properties, and also has electrical conductivity, so that it does not discharge when it comes into contact with the current collector shoe on the vehicle side. plays a role in suppressing
Materials included in this second group are low melting point alloys with a melting point of 45 to 330°C. More specifically, the main components are bismuth, lead, and tin, and also include indium, gallium, antimony, zinc, manganese, silver, and the like. The binder for mixing the impregnating materials 16 of the first and second groups described above and filling them into the inside and outside of the mesh material 13 for bonding and curing may include, for example, an epoxy resin of a room-temperature curing type having electrical insulation properties; A polyester resin or the like is suitable, to which a curing agent and further a curing accelerator are added. Finally, the surface coating material that forms the coating layer 12 on the surface of the track sheet has low friction and low abrasion.
Moreover, a material having sufficient power supply capability to the current collecting shoe is used. Therefore, as a material having low friction and wear resistance, the low melting point alloy powder listed above as the impregnating material is suitable, and in order to obtain low friction and wear resistance, paraffin wax and medium density polyethylene wax are suitable. At least one of the following is used: Tx, tetrafluoroethylene resin powder, graphite powder, molybdenum disulfide powder, and tungsten disulfide powder. Next, specific examples of the runway sheet material according to the present invention will be shown. The mesh material is mixed with various impregnating materials in the proportions shown in the examples below, mixed with a binder and impregnated into the inside and outside surfaces of the mesh material, preferably inside the mold. When pressurized, it hardens in about 4 hours, and can be used as a runway sheet after one day. Before that, a coating material containing a low melting point metal is rubbed onto the surface of the cured sheet using a soft buff to fix it. [Example 1] Mesh material: Double weave where the warp threads are Cu multifilament (7 strands twisted) and the weft threads are polyester monofilament (0.3 to 0.4 mmφ).

[Table] Fine powder

[Example 2]

Mesh material: Double weave consisting of Cu multifilament (7 strands) in the warp thread and polyester monofilament (0.3 to 0.4 mmφ) in the weft thread.

[Example 3]

Mesh material: Double weave where the warp yarn is a blend of Cu multifilament (7 strands) and W monofilament at a ratio of 1:1, and the weft yarn is polyester monofilament.

[Example 4]

Mesh material: Double weave made of a 1:1 blend of Cu multifilament (twisted with 7 threads) for the warp threads and polyester monofilament and carbon multifilament (twisted for 500 threads) for the weft threads.

[Table] Fine powder

[Example 5]

Mesh material: Double weave consisting of Cu multifilament (7 strands) in the warp thread and polyester monofilament (0.3 to 0.4 mmφ) in the weft thread.

[Table] Surface coating material: Polish the surface of the above sheet with L metal powder,
Heat to ℃, apply, and polish with soft paper.
After cooling, graphite powder is applied and polished until a saturated amount is reached. The surface of the molded material thus obtained is polished to expose the warp threads of the mesh material. After that, the low melting point alloy (L metal) was heated to 60℃,
Weld uniformly to the surface of the sheet. At this time, it is best to polish the surface while pressing it flat with a buff or paper. After cooling, graphite powder is further applied to the surface of the sheet while rubbing it to complete the sliding track sheet material. This graphite film prevents the low melting point alloy from sticking to the mating metal of the sliding shoe on the vehicle side even if it melts after cooling.If this low melting point alloy adheres to the mating metal of the sliding shoe on the vehicle side, the friction coefficient This is because it becomes high. Even once a low melting point alloy melts, it has a high surface tension, so it is firmly bonded to the mesh material and there is no risk of it scattering.As mentioned above, by forming a graphite film on the surface, a sliding shoe can be prevented. It can prevent adhesion to the constituent metals. and,
When a sliding vehicle passes by, the low melting point alloy melts due to the heat of friction with the sliding shoe, so it comes into uniform surface contact with the sliding shoe and can reduce the substantial surface pressure that the sliding shoe exerts on the track surface. Frictional drag can be kept low accordingly. The slide track sheet material manufactured as described above was used as a test piece and was adhered to the drum of a high-speed rotating friction tester, and a slider with a diameter of about 6 mm made of an alloy containing 20% copper and 80% tungsten (vehicle (equivalent to a sliding shoe) with a surface pressure of 3 kg/cm ² ,
The friction coefficients measured by changing the rotational circumferential speed of the drum are shown in FIG. 2. At this time, the sliding track sheet material was connected to the positive electrode between the sliding member and the track sheet material, and the sliding member was connected to the negative electrode, and a DC current of 10 A was applied. According to the test results, the friction coefficient of the sliding track sheet material based on each example is 0.1 or less, and the higher the sliding speed, the smaller and more stable the friction coefficient, and there is a significant change in the surface of the sliding track sheet material. was not recognized. At the same time, the results of measuring the wear rate of the slide track sheet materials based on each of the examples described above are shown in FIG. While the slide track sheet materials of other Examples except Example 2 have a small amount of friction at high speeds, the material of Example 2 does not contain tetrafluoroethylene resin in the impregnation material, so it does not wear at high speeds. increase As is clear from the above test results, the sliding track sheet material according to the present invention generally has a small coefficient of friction at high sliding speeds and has wear resistance, so it supports sliding vehicles such as linear motor-propelled vehicles. It is durable enough to be used as a track sheet material. Since the present invention is configured as described above, (1) the damping effect is large against vibrations and high-speed deformation, and the vibration absorption is large; (2) Less friction noise is generated when the vehicle is running;
Both friction coefficient and wear are low. (3) There is almost no need to apply lubricants such as liquid or grease to the rails from the car body side. (4) Tetrafluoroethylene resin, molybdenum disulfide,
Surface coating materials other than tungsten disulfide have low electrical contact resistance and are easy to collect current, but other base materials have high electrical resistance. (5) Almost no eddy current is generated in the base material due to the magnetism of the vehicle body. (6) Even if an eddy current is generated in the surface coating material with low electrical resistance due to the magnetism on the car body side, it will not melt at the same time and generate a reaction force, and will not cause any drag on the car body. Excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the structure of the sliding track sheet material according to the present invention, FIG. 2 is a diagram showing the friction characteristics of the sliding track sheet material according to the present invention, and FIG. 3 is a diagram showing the wear characteristics. It is.

Claims (1)

[Claims] 1 Copper multifilament, nylon wire, polypropylene wire, polyester wire, copper wire, tungsten wire coated with copper, molybdenum wire coated with copper, aluminum wire, tungsten wire coated with aluminum, and molybdenum wire coated with aluminum. The mesh material has at least one warp and a weft of polyester monofilament, carbon multifilament, or a yarn made by twisting polyester monofilament and carbon multifilament, copper, kelmet, bismuth, aluminum,
Impregnated with a mixture of at least one powder of tin, antimony, indium, and lead, powder of a low melting point alloy with a melting point of 200°C or less, and a synthetic resin binder that hardens at room temperature, and hardens under pressure. A sheet material is formed, and a low melting point alloy with a melting point of 200°C or less, graphite, paraffin wax, medium density polyethylene wax, tetrafluoroethylene resin, molybdenum disulfide, and tungsten disulfide are coated on the surface of the sheet material. A slide track sheet material coated with at least one powder of: