TECHNICAL FIELD

The present invention relates to a railcar bogie including a protective film and a protective film-equipped plate spring for a railcar bogie.

BACKGROUND ART

Conventionally, in order to reduce the weight of a railcar, bogies made of fiber-reinforced resin have been developed. A bogie of PTL 1 includes: a plate spring made of fiber-reinforced resin; and a plate spring cover covering the plate spring from above. According to this, the plate spring cover prevents flying stones and the like from colliding with the plate spring, and therefore, the fiber-reinforced resin is prevented from being damaged.

CITATION LIST

Patent Literature

PTL 1: Japanese Laid-Open Patent Application Publication No. 2015-3559

SUMMARY OF INVENTION

Technical Problem

However, the plate spring cover of PTL 1 cannot protect a lower surface of the plate spring, and the degree of freedom of the selection of a protected region is low. Further, the plate spring cover is large, and a rotary mechanism configured to move the plate spring cover such that the plate spring cover follows the deformation of the plate spring is required. This leads to an increase in weight of the railcar.

On the other hand, when the plate spring is protected by coating the surface of the plate spring with paint, the degree of freedom of the setting of the protected region increases, and the increase in weight can be suppressed. However, in order to inspect deterioration and the like of the plate spring at the time of maintenance, the surface of the plate spring is desired to be able to be easily exposed. Further, materials used for the railcar are required to have fire resistance performance. It should be noted that the above-described matters are applied to not only the plate spring but also the other members constituting the railcar.

An object of the present invention is to provide a configuration in which while improving the degree of freedom of the selection of a protected region of a railcar bogie and reducing the weight of a railcar, the surface of a protection target member can be easily exposed, and the railcar bogie has fire resistance performance.

Solution to Problem

A railcar bogie including a protective film according to one aspect of the present invention includes: a protection target member; and a protective film including an adhesive surface stuck to the protection target member. The protective film is configured such that an impact absorbing layer and a flame-retardant layer are laminated in this order from the protection target member side. The impact absorbing layer is thicker than the flame-retardant layer.

According to the above configuration, the protective film is just stuck to the protection target member of the railcar bogie. Therefore, the improvement of the degree of freedom of the selection of the protected region of the railcar bogie and the reduction in the weight of the railcar can be realized. In addition, the protection target member of the railcar bogie that is traveling can be satisfactorily protected from collision with ballasts, snow lumps, or other flying objects by the thick impact absorbing layer. Further, by tearing off the protective film from the protection target member, the surface of the protection target member can be easily exposed. Therefore, the inspection of the protection target member at the time of maintenance can be easily performed. Further, the protective film which satisfies the fire resistance performance required for the railcar can be realized by the flame-retardant layer of the protective film.

Advantageous Effects of Invention

The present invention can provide a configuration in which while improving the degree of freedom of the selection of the protected region of the railcar bogie and reducing the weight of the railcar, the surface of the protection target member can be easily exposed, and the railcar bogie has fire resistance performance.

