US1964095A - Locomotive structure - Google Patents

Description

June 26, 1934.

J. C. TRAVILLA, JR., El AL LOCOMOTIVE STRUCTURE Filed April 13. 1932 5 Sheets-Sheet l Afford Q9 June 1934. J. c. TRAVILLA, JR., T AL 1,964,095

LOCOMOT IVE S TRUCTURE Filed April 13. 1932 5 Sheets-Sheet 2 //2 VZ/z fans James. C Fay/Ha J. f/rzar' 6. /'/a//qa/$7" June 26, 1934.

J. C, TRAVILLA, JR, ET AL LOCOMOTI VE STRUCTURE Filed April 13. 1932 5 Sheets-Sheet 5 June 26, 1934. J. c. TRAVILLA, JR., El AL 1,964,095

LOCOMOTIVE STRUCTURE Filed April 15. 1932 5 Sheets-Sheet 4 June 6, 1934- J. c. TRAVILLA, JR., ET AL 1,964,095

LOCOMOTIVE STRUCTURE Filed April 13. 1932 5 Sheets-Sheet 5 //2 Va: fol's Patented June 26, 1934 UNITED STATES PATENT OFFICE 1,964,095 LOCOMOTIVE STRUCTURE James C. llavilla, J12,

Einar G. Hallquist, Edwardsville, 111., ts General Steel Castings Corporation,

Pa, and assignors Granite Philadelphia,

19 Claims.

This invention relates to railway rolling stock and consists in a novellocomotive underframe structure and refers particularly to the construction of the cylinder saddle and related parts.

Locomotive main steam cylinders are usually rigid with, the sides of the boiler saddle and the exhaust steam passages extend inwardly and upwardly through the upper part of the saddle and merge in a nozzle which exhausts in to the smoke box. The portions or" the saddle immediately ad jacent the cylinders and exhaust passages receive considerable heat from these parts and tend to expand substantially uniformly with them. However, the lower portions or the saddle are usually spaced from the cylinders and steam passages and receive less heat. Accordingly, the thermal stresses set up in the upper and lower parts of the saddle are difierent, resulting in bending moments being imparted to the intervening parts which strain the structure and may cause breakage. This result is aggravated where the cylinder saddle is cast as an integral unit or is formed integrally with an entire locomotive underframe.

The main object of the present invention is to provide a locomotive cylinder saddle structure in which the cylinders and steam passages and parts immediately adjacent the same are permitted to expand freely Without endangering the adjacent rigidly connected parts of the saddle.

Another object is to provide means of mounting the main steam cylinders directly on the side walls of the underframe or saddle without the use of transverse bracing ribs or ties.

These objects and others are attained substantially by eliminating certain portions of the cylinder saddle which in previous constructions have tended to resist the expansion of the above mentioned parts, without at the same time inaterially weakening the structure.

In the accompanying drawings which illustrate the invention- Figure l is in part a top view of an integral locomotive underirame illustrating one form of the invention and in part a horizontal section taken on the line 1-1 of Figure 2.

Figure 2 is a vertical section taken on the longitudinal center line of Figure l.

5 Figure 3 is a half vertical transverse section taken on the line 3-3 of Figure 2.

Figure l is a longitudinal section taken on the line 4-4 of Figure 3.

Figure 5 is a view corresponding to Figure 2 and showing a modification.

Figure 6 is substantially a horizontal section taken on the line 66 of Figure 5.

Figure 7 is a half vertical transverse section taken on the line 7-4 of Figure 5.

Figure 8 is a longitudinal vertical section taken on the center line of an integral locomotive underframe illustrating another modification.

Figure 9 is a View corresponding to Figures 2 and 5 and illustrating another modification.

Figure 10 is substantially a horizontal section taken on the line 10-10 of Figure 9.

Figure 11 is a half vertical transverse section taken on the line 1l-l1 of Figure 9.

Figures 12 and 13 are views correspondingto Figures 1 and 2, respectively, and illustrating another modification.

In Figures 1 to 4, the invention is illustrated as embodied in an integral cast metal locomotive underframe structure including a cylinder saddle and a box section base or main frame. The cylinder saddle includes main steam cylinders l, valve chambers 2, and upwardly disposed transverse and longitudinal walls 3, 4 and 5 projecting above the underfrarne and having boiler mounting flanges 6 at the top. Exhaust steam passages extend from valve chambers 2 inwardly and upwardly through the upper portion of the saddle and merge in an exhaust nozzle 8 which discharges into the smoke box (not shown). Nozzle 8 is braced near the top thereof by a web 8a. v v Y The main portion of the under-frame includes vertical longitudinal side walls 9 which curve outwardly as at 10 and merge with the end portions of steam cylinders l and with steam passages 11 extending between the cylindersl and valve chambers 2. These curved portions 10 cooperate with outwardly ofiset portions 13b of the underframe bottom web to form the sole connections between each cylinder and the adjacent portion of the underirame. Substantially horizontal webs 12 and 13 form the top and bottom, respectively, of the underframe.

Supplementary vertical webs 14-. extend along side walls 9 and between the same and these are bowed outwardly abreast the cylinders l, as at 15. Substantial openings 16 and 17 are provided in the top and bottom webs l2 and 13 between these bowed portions 15. The central portion 13d of bottom web 13 projects into opening 17 and mounts a center plate structure 18. This structure is reinforced by a transverse rib l9 and by a member 20 having an inclined irontwall depending from top web 12 and upright side walls 20a.

Transverse walls 21 and 22, the former in alignment with saddle front wall 3, and upright walls 20a, brace the saddle structure adjacent the openings 16 and 17. Wall 21, bowed portions of longitudinal webs 14, and the sloping front wall of reinforcing member 20 are continuous around the openings 16 and. 17, forming an orifice extending through the main portion of the underframe.

The omission of substantial portions of the top and bottom webs and other bracing connections between the side members of the underframe abreast the cylinders permits these members to flex much more readily to relieve thermal stresses in the cylinders and steam passages and adjacent members of the underframe than is the case where the top and bottom webs of the underframe are continuous between the cylinders.

In Figures 5, 6 and 7, transverse vertical webs 23 and 24 extend entirely across the cylinder saddle and merge with the walls of cylinders 25 inter mediate the end portions thereof. Substantial perforations 26 and 27 are provided in top and bottom webs 28 and 29 between the steam cylinders 25, the bottom web at the center being extended forwardly between supple. entary longitudinal walls 30 and mounting center plate struc ture 31. Inclined ribs 32 depending from top web p 28 intersect supplementary walls 30 and cooperate with the same to brace the center plate structure. In this case, the central opening in the underframe extends entirely across the structure between the steam cylinders and between webs 23 and 24 which cooperate with outwardly curved portions 64 of the underframe side walls to support the cylinders, transverse web 24 being bowed forwardly at the center to clear the center plate structure.

The structure shown in Figure 8 corresponds to that shown in Figures 1 to 4 except that upright rear wall 33 of the smoke box saddle extends downwardly through the underframe to bottom web 34 and the inclined center plate reinforcing structure 35 merges with this wall at its intersection with underframe top wall 65. Saddle walls 33 and 33a extend along the edges of openings 36 and 37 and provide substantial reinforcement without eliminating the desirable flexibility of the side walls and cylinder connections.

In Figures 9, 10 and 11, horizontal bottom web 38 is depressed at the sides of the central opening and adjacent the cylinders 41, and the center plate structure 39 is mounted upon a Web 40 extending forwardly substantially in alignment with the portion of web 33 immediately behind the cylinders. The center plate structure is braced by a member 42 having a sloping top wall and upright sides which merge with rear wall 43 of the smoke box saddle between underframe top and bottom webs 44 and 38. The lower portion of transverse wall 43 is braced from the bottom web 38 and the supplementary side walls 45 by horizontal and vertical ribs 46 and 47, respectively. A vertical transverse rib 48 extends across the rear portion of the center plate structure beneath the sloping wall of bracing member 42.

The main steam cylinders 41 are supported upon box-like structures extending laterally from side walls 49 of the underframe and including vertical webs 50 and horizontal top and bottom webs 51 and 52, each of the top webs having a perforation 53 surrounded by a vertical flange 54. Transverse walls 43 and 55 extending along the edges of openings 56 and 57 in the top and bottom webs of the underframe are spaced a greater distance apart than walls 50 and are disconnected therefrom.

In Figures 12 and 13, the main steam cylinders 66 are rigidly connected together and to the main portion of the underframe by vertical transverse walls 67, and bottom web 58 extends across the underframe between the cylinders and mounts center plate structure 59. Substantial openings 60 and 61 are provided in the top and bottom webs of the underframe immediately behind the rear saddle wall 6'7, and openings 62 and 63 are provided in the top and bottom webs, respectively, immediately in front of the saddle structure. This arrangement of openings relieves stresses in the members of the underframe, due to the expansion in the cylinders, substantially as effectively as the constructions previously described.

In each of the forms, the portions of the underframe adjacent to the cylinders and exhaust passages which heretofore have tended to resist expansion of the latter parts, are constructed so that the underframe may flex more readily in a manner to safely relieve the practically irresistable thermal expansion in the heated parts. On the other hand, the recessed portions of the underframe have been sufficiently reinforced so that the structure is not materially weakened for resisting the longitudinal and vertical forces.

Obviously, the inventive features above disclosed may be embodied in structures varying as to many details from the particular forms described, and the exclusive use of all such modifications as come within the scope of the appended claims is contemplated.

What is claimed is:

1. In a locomotive underframe structure, a substantially box-section base member and main steam cylinders at the sides thereof, the side walls of said member having recessed parts abreast said cylinders and there being an opening in the bottom web of said member and extending from one of said parts to the other to relieve thermal stresses in said member.

2. In a locomotive underframe structure, a base member, and main steam cylinders at each side thereof, said member including a substantially horizontal web, side walls merging with the walls of said cylinders and supporting the same, and supplementary vertical webs extending along said walls, there being a substantial opening in said horizontal web abreast said cylinders and extending between said supplementary webs to relieve thermal stresses in said member.

3. In a locomotive underframe structure, a base member, and main steam cylinders at each side thereof, said member including a substantially horizontal web, side walls curving outwardly and merging with the walls of said cylinders, and sup plementary vertical webs extending along said side Walls and. between the same, said supplementary webs being bulged outwardly abreast said cylinders, and said horizontal web being open between said bulged portions to relieve thermal stresses in said member.

4. Structure as defined in claim 3 an integral cast metal unit.

5. In a locomotive underframe structure, a base member including side walls and a substantially horizontal web, main steam cylinders connected to said side walls, there being an opening in said horizontal web abreast said cylinders, and

comprising a center plate member extending into said opening.

6. In a locomotive underframe structure, a base member including side walls and a substantially horizontal web, main steam cylinders connected to said side walls, there being an opening in said horizontal web abreast said cylinders, a center plate member extending into said opening from the lower portion of said base member, and a member connecting said center plate member with the upper portion of said base member and reinforcing said center plate member.

7. In a locomotive underframe structure, a base member including side walls and a substantially horizontal web, main steam cylinders connected to said side walls, there being an opening in said horizontal web abreast said cylinders, a vertical wall extending transversely of said horizontal web adjacent said opening, a center plate member projecting into said opening, and a member connecting said last mentioned wall and said center plate member and reinforcing the latter.

8. In a locomotive underframe structure, a boxsection base member including side walls and top and bottom webs, main steam cylinders adjacent said side walls, there being substantial openings in said webs abreast said cylinders and extending substantially across said member, a center plate structure projecting into the opening in said bottom web, and a center plate bracing member depending from the upper part of said base member.

9. In a locomotive underframe structure, a box-section base member including side walls and top and bottom webs, main steam cylinders adjacent said side walls, there being substantial openings in said webs abreast said cylinders and extending substantially across said member, and an upwardly disposed wall extending between said webs and around said openings and forming therewith an orifice for relieving thermal stresses in said base member.

10. In a locomotive underframe structure, a box-section base member including side walls and top and bottom webs, main steam cylinders adjacent said side walls, there being substantial openings in said webs abreast said cylinders and extending substantially across said member, a center plate structure projecting into the opening in said bottom web, and an upwardly disposed wall extending between said horizontal webs and around said openings and forming therewith an orifice for relieving thermal stresses in said base h member, said last mentioned wall including a portion merging with and bracing said center plate structure.

11. Structure as defined in claim 10 comprising an integral cast metal unit.

12. In a locomotive underframe structure, a base member including side walls and top and bottom webs, main steam cylinders carried by said side walls, there being openings in said webs abreast said cylinders and extending substantially from side to side of said member, ribs depending from said top web adjacent the opening therein, and a center plate structure supported on said ribs and extending through the opening in said bottom web.

13. In a locomotive underframe structure, a base member including side walls and a bottom web, transverse webs extending across said structure, and main steam cylinders merging with and supported by said side walls and said transverse webs, said bottom web being open substantially from side to side between said transverse webs to relieve thermal stresses in said member.

14. In a locomotive underframe structure, a base member including side walls and a bottom web, main steam cylinders at each side of said member, and transverse webs extending between said cylinders, said side walls curving outwardly and merging with the end portions of said cylinders, and said transverse webs merging with said cylinders intermediate said end portions, said bottom web being open from side to side between said cylinders and said transverse webs to relieve thermal stresses in said member.

15. Structure as defined in claim 14 comprising an integral cast metal unit.

16. In a locomotive underframe structure, a saddle member including a bottom web and a wall projecting upwardly therefrom and having a boiler mounting flange at the top, cylinder elements at the sides of said member, there being an opening in said bottom web between said elements to relieve thermal stresses therein, a center plate member projecting into said opening, and an element projecting from said wall and bracing said center plate member.

17.111 a locomotive underframe structure, a saddle member including a bottom web and a wall projecting upwardly therefrom and having a boiler mounting flange at the top, cylinder elements at the sides of said member, there being an opening in said bottom web between said elements to relieve thermal stresses therein, a center plate member projecting into said opening, an element projecting from said wall and bracing said center plate member, and reinforcing ribs between said wall and adjacent portions of the structure.

18. In a locomotive underframe structure, a base member including side walls, and main steam cylinders adjacent said walls, said walls having outwardly offset portions merging with said cylinders and forming supports therefor, and there being an opening disposed upwardly through said member and extending substantially from cylinder to cylinder for relieving thermal stresses therein.

19. In a locomotive underframe structure, a base member having side walls, and steam cylinders adjacent and merging with said walls, said walls constituting the sole direct connection between said cylinders and said base member and said base member being substantially open between said cylinders.

JAMES C. TRAVILLA, JR. EINAR G. HALLQUIST.

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