# US 11,299,184 B2 · Railcar bogie including protective film and protective film-equipped plate spring

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- Number: US 11,299,184 B2
- Document ID: US11299184B2
- Status: Granted
- Kind: B2
- Application number: 16/610,298
- Filed: 2017-05-01
- Published: 2020-03-12
- Granted: 2022-04-12
- Earliest claimed: 2017-05-01
- Assignees: Kawasaki Jukogyo Kabushiki Kaisha
- Applicants: Kawasaki Jukogyo Kabushiki Kaisha
- Inventors: Takehiro Nishimura; Yousuke Tsumura; Fumihide Inamura; Katsuyuki Kawashima; Ikko Hanaki; Yuhei Tanaka
- Web page: https://patentgrep.com/patent/US11299184B2

## CPC

- B61F 5/04: Bolster supports or mountings (side bearings B61F5/14)
- B61F 5/301: {incorporating metal springs}
- B61F 5/305: {incorporating rubber springs}
- B61F 3/02: with more than one axle
- B61F: RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES (for vehicles in general B60; axles or wheels B60B; vehicle tyres B60C)

## Abstract

A railcar bogie includes: a protection target member of the railcar bogie; 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.

## Claims

### Claim 1

A railcar bogie comprising:
a protection target member; and
a protective film including an adhesive surface stuck to the protection target member, wherein:
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; and
the impact absorbing layer is thicker than the flame-retardant layer.

### Claim 2 (depends on 1)

The railcar bogie according to claim 1, wherein:
an adhesive layer including the adhesive surface is laminated on the impact absorbing layer from the protection target member side; and
adhesive force of the adhesive layer with respect to the protection target member is smaller than adhesive force of the impact absorbing layer with respect to the adhesive layer.

### Claim 3 (depends on 1)

The railcar bogie according to claim 1, wherein adhesive force of the adhesive surface with respect to the protection target member is 5 N/20 mm or more and 35 N/20 mm or less.

### Claim 4 (depends on 1)

The railcar bogie according to claim 1, wherein:
a colored layer is laminated between the flame-retardant layer and the impact absorbing layer; and
the flame-retardant layer is transparent or semitransparent.

### Claim 5 (depends on 1)

The railcar bogie according to claim 1, wherein the flame-retardant layer is resin selected from polyimide and vinyl chloride, thermoplastic resin containing a flame retardant, a glass fiber sheet, or a metal film.

### Claim 6 (depends on 5)

The railcar bogie according to claim 5, wherein a thickness of the flame-retardant layer is 10 μm or more and 400 μm or less.

### Claim 7 (depends on 1)

A protective film-equipped plate spring for a railcar bogie,
the protective film-equipped plate spring comprising:
a plate spring made of fiber-reinforced resin and mounted on the railcar bogie; and
the protective film according to claim 1, the protective film being stuck to the plate spring.

### Claim 8 (depends on 7)

The protective film-equipped plate spring according to claim 7, wherein:
upper and lower surfaces of the plate spring include inclined regions inclined with respect to a horizontal plane when viewed from a car width direction; and
the protective film is stuck to each of portions of the inclined regions of the upper and lower surfaces of the plate spring, the portions being exposed to outside.