Closed socket brazed joint assembly

Patent metadata

Field	Value
Publication number	US-2020223003-A1
Application number	US-201916245918-A
Country	US
Kind code	A1
Filing date	Jan 11, 2019
Priority date	Jan 11, 2019
Publication date	Jul 16, 2020
Grant date	—

Abstract

A closed socket brazed joint assembly is provided. The assembly comprises: a first member composed of a first base material; a second member composed of a second base material with a first end composed of a first profile with at least first and second faying surfaces; a socket formed in said first member configured to receive the first end of the second member with a faying surface with at least two portions separated by a first fillet; wherein the socket further is configured such that in a first state before the application of energy to the joint there is a gap with a width between the faying surfaces of the first member and the faying surfaces of the second member; and, in the first state a slug of brazing fill material is disposed between the first end of the second member and at least one faying surface of the socket; and, wherein a second state is created when upon application of energy the brazing fill material melts and flows from between first end of the second member and the at least one faying surface of the socket filling aforesaid gap between the faying surfaces of the first and second members.

First claim

What is claimed is:

1 . A locomotive traction motor comprising:
a first member; a second member with a first end having a first profile with at least first and second faying surfaces; and a socket formed in said first member configured to receive the first end of the second member, the socket having faying surfaces with at least two portions separated by a first fillet; wherein the socket further is configured such that in a first state before the application of energy to the joint there is a gap with a width between the faying surfaces of the first member and the faying surfaces of the second member; and, in the first state a slug of brazing fill material is disposed between the first end of the second member and at least one of the faying surfaces of the socket; and, wherein a second state is created when upon application of energy the brazing fill material melts and flows from between the first end of the second member and the at least one of the faying surfaces of the socket filling aforesaid gap between the faying surfaces of the first and second members, to form a closed socket brazed joint that joins the first and second members.

2 . The locomotive traction motor of claim 1 ,
wherein in the first state a slug of flux material is disposed between at least one of: the first end of the second member and the slug of brazing fill material; or between the slug of brazing fill material and the at least one of the faying surfaces of the socket.

3 . The locomotive traction motor of claim 1 ,
wherein a radius of the first fillet is at least equal to the width of the gap between the faying surfaces of the first member and the faying surfaces of the second member in the first state.

4 . The locomotive traction motor of claim 1 further comprising:
at least one additional fillet formed in the wall faying surface of the socket at locations that correspond to a change in the profile of the second faying surface of the second member.

5 . The locomotive traction motor of claim 4 ,
wherein the at least one additional fillet has a radius at least equal to the width of the gap between the faying surfaces of the first member and the faying surfaces of the second member in the first state.

6 . The locomotive traction motor of claim 4 ,
wherein end points defining a surface of the at least one additional fillet are extended to form indexing guides configured to position the faying surfaces of the first member with the faying surfaces of the second member.

7 . The locomotive traction motor of claim 1 ,
wherein the first member comprises an annular ring and the second member comprises a conductor bar.

8 . The locomotive traction motor of claim 1 ,
wherein a volume of the brazing fill material slug is equal to a volume of the socket less a volume of the portion of the first end of the second member in the socket multiplied by a factor of two.

9 . The locomotive traction motor of claim 8 ,
wherein the volume of the brazing fill material slug is within the range of 1.8-2.2 units of volume.

10 . The locomotive traction motor of claim 1 further comprising:
an indexing guide configured to position the faying surfaces of the second member in a pre-determined alignment with the faying surfaces of the socket of the first member, forming an indexed closed socket brazed joint.

11 . The locomotive traction motor of claim 10 , wherein the indexing guide is comprised of at least one of: a first surface, a contact surface, or a second surface.

12 . The locomotive traction motor of claim 11 , wherein the indexing guide comprises at least the contact surface, and the contact surface is configured to self-align the faying surfaces of the second member.

13 . The locomotive traction motor of claim 10 , wherein the indexing guide is composed from at least one of: brazing fill material, flux, and/or material that vaporizes upon joint formation.

14 . The locomotive traction motor of claim 10 , wherein the indexing guide is configured to increase available faying surface area.

15 . A brazed joint assembly for a locomotive traction motor, comprising:
at least one closed socket brazed joint having at least first and second members with respective faying surfaces; and at least one indexed closed socket brazed joint comprising at least the first member, a third member, and at least one index guide; wherein the at least one index guide of the at least one indexed closed socket brazed joint is configured to align the faying surfaces of the at least first and second members of the at least one closed socket brazed joint.

16 . The brazed joint assembly of claim 15 , wherein the first member is an annular ring, the second member is a first conductor bar, and the third member is a second conductor bar.

17 . The brazed joint assembly of claim 16 , wherein the annular ring has at least three indexed closed socket brazed joints spaced apart from one another by 120° with respect to a center axis of the annular ring.

18 . A method of forming a closed socket brazed joint for a locomotive traction motor, the method comprising:
providing a first member composed of a first base material; providing a second member composed of a second base material and having a first end comprised of a first profile with at least first and second faying surfaces; forming in the first member a socket having plural faying surfaces with at least two portions separated by a fillet, the socket configured to receive the first end of the second member, wherein a radius of the fillet is at least equal to a distance between the faying surfaces of the first and second members when the first end of the second member is disposed in the socket; placing a slug of brazing fill material in the socket formed in the first member, the slug of brazing fill material substantially in conformation with the first profile of the first end of the second member; placing the first end of the second member into the socket of the first member, trapping the slug of brazing fill material; applying energy to at least one of the first base material of the first member or the second base material of the second member; and, melting the brazing fill material.

19 . The method of forming a closed socket brazed joint of claim 18 , further comprising:
calculating a volume for the brazing fill material as equal to a volume of the socket formed in the first member less a volume of the portion of the first end of the second member in the socket multiplied by a factor of two, wherein the slug of brazing fill material that is provided has a volume corresponding to the volume that is calculated.

20 . The method of forming a closed socket brazed joint of claim 18 , further comprising:
in the socket formed in the first member, forming an indexing guide configured to position the faying surfaces of the second member in a pre-determined alignment with the faying surfaces of the socket formed in the first member.

21 . An apparatus for a locomotive traction motor, comprising:
a first member having a first surface; wherein the first member defines a closed socket formed into the first surface, the socket defined by plural faying surfaces, the plural faying surfaces including a peripheral sidewall and a floor, the peripheral sidewall extending from the first surface of the first member and terminating at the floor, the floor and the first surface being spatially independent surfaces, wherein the peripheral sidewall is transitioned to the floor

Assignees

• Gen Electric

Inventors

• Apostolopoulos Andreas Athanassios
• Wayne James
• Frampton Alan Glenn
• Kessler Kyle
• Edara Ramesh

Classifications

• H02K15/33

  Connecting winding sections; Forming leads; Connecting leads to terminals · CPC title

• H02K15/023 Primary

  Cage rotors · CPC title

• H02K17/20

  having deep-bar rotors · CPC title

• B23K1/008 Primary

  Soldering within a furnace (B23K1/012 takes precedence) · CPC title

• H02K3/51

  applicable to rotors only · CPC title