Railcar bogie plate spring

Patent metadata

Field	Value
Publication number	US-9428199-B2
Application number	US-201214345616-A
Country	US
Kind code	B2
Filing date	Sep 13, 2012
Priority date	Sep 15, 2011
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A railcar bogie plate spring of the present invention includes: an upper surface member constituted by fiber reinforced plastic in which reinforced fibers are stacked so as to extend in a longitudinal direction; a lower surface member constituted by fiber reinforced plastic in which reinforced fibers are stacked so as to extend in the longitudinal direction; and a core member arranged between the upper surface member and the lower surface member. The core member is constituted by fiber reinforced plastic in which: reinforced fibers are stacked in a width direction perpendicular to a stack direction of the upper surface member and the lower surface member; and in a side view of the core member, the reinforced fibers are inclined relative to a bending neutral axis so as to intersect with one another.

First claim

The invention claimed is:

1. A railcar bogie plate spring comprising:
an upper surface member constituted by a first fiber reinforced plastic including a plurality of first resin-impregnated layers, each first resin-impregnated layer including a plurality of first continuous reinforced fibers extending in at least a lengthwise direction of the first resin-impregnated layer and forming a first continuous sheet of fibrous material, the plurality of first resin-impregnated layers being stacked so that the plurality of first continuous reinforced fibers extend in a longitudinal direction of the railcar bogie plate spring;
a lower surface member constituted by a second fiber reinforced plastic including a plurality of second resin-impregnated layers, each second resin-impregnated layer including a plurality of second continuous reinforced fibers extending in at least a lengthwise direction of the second resin-impregnated layer and forming a second continuous sheet of fibrous material, the plurality of second resin-impregnated layers being stacked in a stack direction extending from a lower surface of the lower surface member toward an upper surface of the upper surface member so that the plurality of second continuous reinforced fibers extend in the longitudinal direction of the railcar bogie plate spring;
a core member arranged between the upper surface member and the lower surface member, the core member being constituted by a third fiber reinforced plastic including a plurality of third resin-impregnated layers, each third resin-impregnated layer including a plurality of third continuous reinforced fibers forming a third continuous sheet of fibrous material, the plurality of third resin-impregnated layers being entirely stacked in a width direction perpendicular to the stack direction of the upper surface member and the lower surface member, and in a side view of the core member, the third continuous reinforced fibers of each of the plurality of third resin-impregnated layers are angled relative to a bending neutral axis of the core member so as to intersect with one another; and
a lower surface of the railcar bogie plate spring is constituted by: (i) straight portions respectively extending from end portions of the railcar bogie plate spring toward a center of the railcar bogie plate spring so as to be angled relative to the bending neutral axis, and (ii) a central concave arc-shaped portion formed at a middle portion between the straight portions, the central concave arc-shaped portion being below the end portions of the railcar bogie plate spring in the stack direction, wherein
the upper surface member, the lower surface member, and the core member extend continuously from one end to another end of the railcar bogie plate spring.

2. The railcar bogie plate spring according to claim 1 , wherein a thickness of the upper surface member is greater than a thickness of the lower surface member.

3. The railcar bogie plate spring according to claim 2 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

4. The railcar bogie plate spring according to claim 1 , wherein in the side view of the core member, the third continuous reinforced fibers are angled at 45° relative to the bending neutral axis.

5. The railcar bogie plate spring according to claim 4 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

6. The railcar bogie plate spring according to claim 4 , wherein the third continuous reinforced fibers of each of the third resin-impregnated layers are inclined at an angle of 45 degrees relative to the bending neutral axis of the core member.

7. The railcar bogie plate spring according to claim 4 , wherein the third continuous reinforced fibers of each of the third resin-impregnated layers are declined at an angled of 45 degrees relative to the bending neutral axis of the core member.

8. The railcar bogie plate spring according to claim 4 , wherein the third continuous reinforced fibers include a first set of interwoven fibers angled at +45 degrees and a second set of interwoven fibers angled at —minus 45 degrees relative to the bending neutral axis of the core member.

9. The railcar bogie plate spring according to claim 1 , wherein a thickness of the railcar bogie plate spring gradually increases from the end portions toward the center.

10. The railcar bogie plate spring according to claim 9 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

11. The railcar bogie plate spring according to claim 1 , further comprising a metal protective member provided under the lower surface member.

12. The railcar bogie plate spring according to claim 11 , further comprising an elastic member made of an elastic material and interposed between the lower surface member and the protective member.

13. The railcar bogie plate spring according to claim 12 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

14. The railcar bogie plate spring according to claim 11 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

15. The railcar bogie plate spring according to claim 1 , further comprising a bogie load receiving member provided above the upper surface member.

16. The railcar bogie plate spring according to claim 15 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

17. The railcar bogie plate spring according to claim 1 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

18. A railcar bogie plate spring comprising:
an upper surface member constituted by fiber reinforced plastic in which reinforced fibers are stacked so as to extend in a longitudinal direction;
a lower surface member constituted by fiber reinforced plastic in which reinforced fibers are stacked so as to extend in the longitudinal direction; and
a core member arranged between the upper surface member and the lower surface member, wherein:
the upper surface member, the lower surface member, and the core member extend continuously from one end to the other end of the railcar bogie plate spring;
the core member is constituted by fiber reinforced plastic in which reinforced fibers are entirely stacked in a width direction perpendicular to a stack direction of the upper surface member and the lower surface member, and in a side view of the core member, the reinforced fibers are inclined relative to a bending neutral axis so as to intersect with one another;
a lower surface of the railcar bogie plate spring is constituted by straight portions respectively extending from end portions of the railcar bogie plate spring toward a center of the railcar bogie plate spring so as to be inclined downward and an arc-shaped portion formed at a middle portion between the straight portions;
a bogie load receiving member is provided above the upper surface member; and

a buffer member made of an elastic material is interposed between the upper surface member and the bogie load receiving member.

19. The railcar bogie plate spring according to claim 18 , wherein at least the third fiber reinforced plastic is carbon fiber reinforced plastic (CFRP).

Assignees

• Kimura Gaku
• Furuya Mitsuhiro
• Nakao Shunichi
• Nishimura Takehiro
• Gh Craft Ltd
• Kawasaki Heavy Ind Ltd

Inventors

• Kimura Gaku
• Furuya Mitsuhiro
• Nakao Shunichi
• Nishimura Takehiro

Classifications

• B61F5/30 Primary

  Axle-boxes mounted for movement under spring control in vehicle or bogie underframes {(B61F5/36 takes precedence over B61F5/305 - B61F5/34)} · CPC title

• F16F1/368

  Leaf springs · CPC title

• B61F5/523

  comprising parts made from fibre-reinforced matrix material · CPC title

• F16F1/18

  Leaf springs {(planar springs in general F16F1/027; "Belleville"-type springs with generally radial arms F16F1/324)} · CPC title

• Y02T30/38

  Cross-Sectional Technologies · mapped topic