Axle box suspension of railcar bogie

Patent metadata

Field	Value
Publication number	US-10399579-B2
Application number	US-201615548360-A
Country	US
Kind code	B2
Filing date	Jan 25, 2016
Priority date	Feb 2, 2015
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

An axle box suspension of a railcar bogie is configured to couple an axle box, accommodating a bearing supporting an axle, to a bogie frame and includes: an axle beam including an axle beam main body portion and an axle beam end portion, the axle beam main body portion extending from the axle box in a car longitudinal direction, the axle beam end portion being provided at a tip end of the axle beam main body portion and including a tubular portion that is open at both car width direction sides; a core rod inserted into an internal space of the tubular portion in a car width direction; an elastic bushing interposed between the tubular portion and the core rod; and a receiving seat provided at the bogie frame, both end portions of the core rod being connected to the receiving seat, the tubular portion being divided into a first semi-tubular portion and a second semi-tubular portion, the first semi-tubular portion being formed integrally with the axle beam main body portion, the second semi-tubular portion being stacked on the first semi-tubular portion in an upward/downward direction.

First claim

The invention claimed is:

1. An axle box suspension of a railcar bogie, the axle box suspension being configured to couple an axle box to a bogie frame, the axle box accommodating a bearing supporting an axle,
the axle box suspension comprising:
an axle beam including an axle beam main body portion and an axle beam end portion, the axle beam main body portion extending from the axle box in a car longitudinal direction, the axle beam end portion being provided at a tip end of the axle beam main body portion and including a tubular portion that is open at both car width direction sides;
a core rod inserted into an internal space of the tubular portion in a car width direction;
an elastic bushing interposed between the tubular portion and the core rod; and
a receiving seat provided at the bogie frame, both end portions of the core rod being connected to the receiving seat,
the tubular portion being divided into a first semi-tubular portion and a second semi-tubular portion, the first semi-tubular portion being formed integrally with the axle beam main body portion, the second semi-tubular portion being stacked on the first semi-tubular portion in an upward/downward direction, and
wherein the second semi-tubular portion includes:
a main opposing surface opposing the first semi-tubular portion in the upward/downward direction, and
a sub opposing surface opposing at least one of the first semi-tubular portion and the axle beam main body portion in the car longitudinal direction.

2. The axle box suspension according to claim 1 , wherein the sub opposing surface includes:
a first sub opposing surface configured to restrict displacement of the second semi-tubular portion relative to the first semi-tubular portion in one direction along the car longitudinal direction; and
a second sub opposing surface configured to restrict displacement of the second semi-tubular portion relative to the first semi-tubular portion in the other direction along the car longitudinal direction.

3. The axle box suspension according to claim 1 , wherein when viewed from the car width direction, a circumferential length of a semi-cylindrical inner surface of the first semi-tubular portion is longer than a circumferential length of a semi-cylindrical inner surface of the second semi-tubular portion.

4. The axle box suspension according to claim 3 , further comprising a fastening member inserted into the first semi-tubular portion and the second semi-tubular portion in the upward/downward direction to fix the second semi-tubular portion to the first semi-tubular portion, wherein
when viewed from the car width direction, the first semi-tubular portion projects toward the second semi-tubular portion beyond a virtual line extending through a center of the tubular portion and perpendicular to a direction in which the fastening member is inserted.

5. The axle box suspension according to claim 2 , wherein when viewed from the car width direction, a circumferential length of a semi-cylindrical inner surface of the first semi-tubular portion is longer than a circumferential length of a semi-cylindrical inner surface of the second semi-tubular portion.

6. The axle box suspension according to claim 5 , further comprising a fastening member inserted into the first semi-tubular portion and the second semi-tubular portion in the upward/downward direction to fix the second semi-tubular portion to the first semi-tubular portion, wherein
when viewed from the car width direction, the first semi-tubular portion projects toward the second semi-tubular portion beyond a virtual line extending through a center of the tubular portion and perpendicular to a direction in which the fastening member is inserted.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Okumura Yasufumi

Classifications

• B61F5/52 Primary

  Bogie frames · CPC title

• B61F5/302

  Leaf springs · CPC title

• B61F5/26 Primary

  Mounting or securing axle-boxes in vehicle or bogie underframes · CPC title