Railcar truck
US-9623883-B2 · Apr 18, 2017 · US
Truck for railcar
US10232864B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10232864-B2 |
| Application number | US-201315026042-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 25, 2013 |
| Priority date | Oct 25, 2013 |
| Publication date | Mar 19, 2019 |
| Grant date | Mar 19, 2019 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
There is provided a three-axle truck for a railcar having three wheelsets in a truck frame of the one truck, in which in each of the wheelsets, axle boxes are supported by the truck frame through axle springs, the truck frame has a structure for supporting a carbody whose weight is variable, and making variations in axle loads on the respective wheelsets be maintained at a preset value or less in spite of change of the carbody weight, and in this structure, spring constants of the both-end axle springs in the respective wheelsets located at both ends of three axles are set to be larger than a spring constant of the middle axle spring of the wheelset located in the middle.
First claim
Opening claim text (preview).
The invention claimed is: 1. A truck for a railcar comprising at least three wheelsets in a truck frame of the truck, each of the wheelsets include an axle box that is supported by the truck frame through axle springs, the truck being configured such that spring constants of both-end axle springs, which are axle springs in the respective wheelsets located at both ends of the at least three wheelsets, are set to be larger than a spring constant of a middle axle spring, which is an axle spring of at least one wheelset other than those at the both ends, and the spring constants of both-end axle springs are set to be larger than the spring constant of the middle axle spring by an amount that is based on a spring stiffness in the spring action of a side frame of the truck frame. 2. A truck for a railcar comprising at least three wheelsets in a truck frame of the truck, each of the wheelsets includes an axle box that is supported by the truck frame through axle springs, the truck being configured such that the spring constants of both-end axle springs in the respective wheelsets located at both ends of the at least three wheelsets are set to be larger than a spring constant of a middle axle spring, which is an axle spring of at least one wheelset other than those at both ends, and assuming that the spring constant of the middle axle spring is k 1 , the spring constants of the both-end axle springs are k 2 , and the spring constant in the spring action of the truck frame with respect to a carbody load is kt, wherein the following relationship therebetween is established, k 2=1/((1/ k 1)−(1/ kt )).
Assignees
Inventors
Classifications
with more than one axle · CPC title
- B61F5/36Primary
Arrangements for equalising or adjusting the load on wheels or springs, e.g. yokes · CPC title
incorporating metal springs · CPC title
Axle-boxes mounted for movement under spring control in vehicle or bogie underframes {(B61F5/36 takes precedence over B61F5/305 - B61F5/34)} · CPC title
- B61F3/06Primary
with three or more axles · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US10232864B2 cover?
- There is provided a three-axle truck for a railcar having three wheelsets in a truck frame of the one truck, in which in each of the wheelsets, axle boxes are supported by the truck frame through axle springs, the truck frame has a structure for supporting a carbody whose weight is variable, and making variations in axle loads on the respective wheelsets be maintained at a preset value or less …
- Who is the assignee on this patent?
- Kawasaki Heavy Ind Ltd
- What technology area does this patent fall under?
- Primary CPC classification B61F5/36. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 19 2019 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).