US2549241A

US2549241A - Adjustable gearing

Info

Publication number: US2549241A
Application number: US782879A
Authority: US
Inventors: Rorive Arille
Original assignee: Gen Mecanique Appliquee Soc In
Current assignee: Industrielle Generale de Mecanique Appliquee SIGMA SA
Priority date: 1946-11-13
Filing date: 1947-10-29
Publication date: 1951-04-17
Anticipated expiration: 1968-04-17

Description

April 17, 1951 A RORIVE ADJUSTABLE GEARING 'Filed Oct. 29, 1947 8 w flw m E 1 2 W/ ljm W 5 F W m 9 m 90 m INVENTOR ARlLLE RoRwE ATTORNEYS Patented Apr. 17, 1951 ADJUSTABLE GEARING Arille Rorive, Lyon, France, assignor to Societe Industrielle Generale de Mecanique Appliquee (S. I. G. M. A.), Vcnissieux (Rhone), France,

a French society Application October 29, 1947, Serial No. 782,879 In France November 13, 1946 The invention relates to systems including at least one gear train with an adjustable distance between pinion axes and it is more especially, although not exclusively, concerned with systems of this kind in which the gear train belongs to a gear pump.

The chief object of my invention is to provide a system of this kind which is better adapted to meet the requirements of practice than those used for the same purposes up to this time.

Preferred embodiments of the present invention will be hereinafter described with reference to the accompanying drawing, given merely by way of examples, and in which:

Fig. 1 shows, in sectional view, a gear pump made according to my invention;

Fig. 2 is a view of the plate that carries the pinions of the gear pump shown by Fig. 1;

Fig. 3 shows, on a larger scale and in section on the line 33 of Fig; 1, the means for determining the adjustment of the distance between pinion axes.

In the following description, it will be supposed that my invention is applied to a pump intended to steady the flow of a fluid such as viscose for feeding the spinning nozzles of an artificial'fiber spinning machine.

Concerning the construction of the pump, with the exception of the means for supporting the pinionsthereof, it may be of any suitable kind, for instance as shown by the drawing, which shows a pump constituted by a plurality of juxtaposed plates. In one of these plates, to wit plate I, located approximately in the middle part of the pump and including two recesses, are housed the two pinions 2 and 3 which constitute the gear train of the gear pump. One of them, the driving pinion, for instance pinion 2, is driven from the outside, while the other, the driven pinion, in this example pinion 3, receives its movement through the driving pinion. I provide, in said plate I on either side of the place where the two pinions 2 and 3 are in mesh with each other, the suction and delivery chambers of the pump, not shown by the drawing, these chambers communieating with the suction and delivery conduits.

I provide, on either side of said plate I, plates 4 and 5. The whole of these plates connected together by bolts forms the casing of the pump, which contains gear train 23.

Pinions 2 and 3 are carried by spindles or shafts 9 and II] whichare housed in at least one of the 6 Claims. (Cl. 74397) distance between the axes of rotation of the two" pinions.

the suction and delivery chambers, obtained by the meshing together of the teeth of pinions 2 and 3, depends upon the more or less perfect manner in which the teeth of the two pinions are in mesh, therefore, among other things, upon the For practical purposes, more or less importan leak is unavoidable.

In the case of pumps runningat a relatively high speed, a very accurate machining of the gears, plates, shafts and shaft housings suffices to ensure a practical flow rate very close to the theoretical volumetric rate.

On the contrary, in the'case of pumps running" very slowly as it is the case for pumps used to steady the flow rate of viscose and to feed the spinning nozzles of artificial fiber spinning machines, it is very difiicult to obtain, in mass production, systems which, without adjustment after machining, give a satisfactory efliciency. Therefore it will be necessary to provide adjust- .ment means, in particular for the distance between axes of the pinion, which will permit of rectifying the differences comin from manu-.

facturing tolerances, to give the pump a satisfactory emciency.

This adjustment is preferably performed at the manufacturing works, to be subsequently maintained, without the user of the pump being able,

even if he takes the pump to pieces for cleaning purposes, to destroy the adjustment obtained when mounting or remounting the pump.

For this purpose, the shaft or spindle of at leastone of the pinions 2 and 3, preferably the driven of the shaft in question having for its effect to adjust the distance between the axes of pinions.

2 and 3 and therefore the leak that may twKe place in the pump. l

Furthermore, and accordingto the main feature of the invention, I provide marking means to determine the position in which shaft It) is located with respect to plates 4, 5, once the adjustment of the distance between axes is obtained.

These marking means, when the various elements of the pump are assembled, compel the fitter to give said shaft the same position that has been given to said shaft when the pump was fitted. 'Advantageously, these marking means include on the onehand, a part hereinafter called key, adjustable angularly on the shaft ii] that carries the driven pinion 3 and having a noncircular and asymmetrical shape with respect to the axis of said shaft, and on the other hand, a

housing of a shape corresponding to that of said key and adapted to fit therewith with a play as I small as possible, this housing being provided in a fixed part of the'pump, 'for instance in a closure plate.

For instance, I provide on one of the ends N1 of shaft Ill a key in the form of a rectan ular plate l6 the center of which is at a distance from the axis of portion I and which, after assembly of the pump elements, fits in a housing I of closure plate 18, the play between the upper and, 7

provide, an extension IS on the end .1 of shaft 1!] and a toothed portion rigid or integral with said extension at the end thereof, the diameter of extension 19 being smaller than the diameter both of shaft element 10 and of toothed portion 20, whereby a groove 2.] is formed betweenportions. H1 and 20.

Furthermore, I provide in key 16 an aperture 22 having a toothed inner edge, the teeth-of this ner. Key I6 is engaged on toothed portion 2!],

care being taken to place the key in the position that corresponds to its engagement in the housing ll of closure plate I8 and finally, after having angularly positioned piece 23, as above explained, lugs 25 are folded against key l6. Finally, closure plate i8 is fixed on the pump. Key it is thus imprisoned in its housing ll of platelS, the distance between the pinion axes that is determined by the angular adjustment of spindle it remain at the desired value with a tplerance which is at most equal to the angle corresponding to one half of a tooth of toothed system 22.

If the pump is to be taken in to pieces and resembled, the initial djustment remains ensuredras long as the locking piece 23 is not separated from key it, since the shape of key I6 and of'housing l1, same as the asymmetrical position of the elements with respect to the axis of shaft portion Hi or of toothed portion 20 do not permit of assembling the system in a position different from that chosen when the pump was gauged.

Concerning the drive of the driving pinion 2 of a gear pump made according to my invention, 7

' it ma be ensured by'securing pinion 2 directly edge corresponding exactly. to the teeth of portion 20.

I can thus engage key 16 on portion 20 in any desired annular adjustment position with respect to shaft l0, this adjustment position being maintainedby the meshing of the respective teeth of parts "5 and 20. 1

In order to lock key It on theporti'on zll'of ture 24 corresponding in shape to the aperture 22 provided in the key and'provided with four foldable lugs 25. In order to lock" key it, sheet 1 metal piece 23 is slipped on portion 20 until this piece is located in the space corresponding to g-roove'Zl that is to say beyond portion 26. Then key I 6 is placed in position on portion 2i! with the desired angular adjustment, and finally piece 23 is applied against toothed portion 20 with the inwardly extending teeth of piece 23 located opposite the outwardly extending teeth of portion 2!). Lugs 25 are then folded on the outer side of key it which is thus locked in the desired angular posit on with respect to shaft l0.

Adjustment of the distance between the axes of pinions 2 and 3 is obtained in the following manner; plate I and its pinions 2 and 3 are assembled with distance plates 4 and 5 (see Fig.

1), and, if necessary, with other parts of the pump, but without closure plate l8. This assembly may. be efiected through any suitable means -which serve merely to the mounting of the pumpor remain permanently fixed thereto. 'I'hen spindle IE3 is turned until the desired adjustment of the distance between axes is obtained, that is to say, most often, until play between the teeth of the gears is eliminated. In this position, which may be indicated by a marking, I introduce locking-plate 23' in the above indicated manon its shaft 9, for'instance by means of a pin 26 and having shaft Qdriven through any suitable means. I

It is clearthat the distance between the axes of pinions 2v and '3 can be adjusted in such man-i.

her as to take up as well as possible the 'func-. tional play of the pump and to ensure the best possible fi-uidtig'htness at the place-where pinions 2 and 3 are in mesh with each other, so as thus toobtain the-minimum leakage and the best-possible flowrate. 7

By adjusting the distance between axes and thus modifying the play, it is also possible to vary the flow rate of the pump in order to obtain a more accurate gauging of the volumetric flow rate thereof.

Adjustment of the distance betweenv axes, according to my invention might also be, utilized to take up the play that might be produced by wear and tear after a long time of'service.

Still another advantage of my invention consists in this; In high precision gear pumps such as viscose pumps, the pinions must have an extremely small clearance in the recesses of the p a e n which they are hou ed. It follows hat, in known pumps, account being taken. of the posible l r n s of. manufacture. for the distance we naxes, the pinions, which are pushed away f om ch other by the pressure of the fluid forced by the pump, been most often, not ugh their bores on their spindles, but. throu h the heads of their teeth on the, bore of the re 0.85.565 provided in said plate. This constitutes a serious drawback because the gear teeth, then ctin as mil-ling tools, quickly wear off these re. sses so that the. pumps get outof action. With? tion, are'applied by the fluid pressure against their respective spindles.

The gear train with an adjustable distance be tween axes might include several driven pinions, each provided with an adjustment device according to the present invention.

In a general manner, while I have, in the above description, disclosed what I deem to be practical and eflicient embodiments of the present invention, it should be well understood that I do not wish to be limited thereto as there might be changes made in the arrangement, disposition and form of the parts without departing from the principle of the present invention as comprehended within the scope of the appended claims.

What I claim is:

1. In a device, a casing and two intermeshing pinions mounted in said casing, in combination with a crank piece including two portions of revolution having their axes eccentric with respect to each other, one of said portions being housed in said casing with angular adjustment about its axis and the other acting as a journal for one of said pinions, a key plate carried by the first of said cylindrical portions transversely thereto, said key plate having a non-circular outline eccentric with respect to the axis of said last mentioned cylindrical portion and being adjustable angularly about this axis, said casing being provided with an aperture having an outline of the same shape as that of said key plate, said aperture being adapted to accommodate said key plate when said shaft is assembled on said casing, and means for locking said key plate on said crank piece in a given angular position with respect to the axis of said first cylindrical portion thereof.

2. A device which comprises, in combination,

a plate, two intermeshing pinions mounted in said plate, a closure plate on either side of said first mentioned plate, a crank piece including two portions of revolution having their axes eccentric with respect to each other, one of said portions being housed With angular adjustment about its axis in one of said closure plates at right angles thereto and the other acting as a journal for one of said pinions, a key plate carried by the first mentioned portion transversely thereto, said key plate having a non-circular outline eccentric with respect to the axis of said last mentioned portion and being adjustable angular-1y about this axis, said casing being provided with an aperture having an outline of the same shape 5 as that of said key plate, said aperture being adapted to accommodate said key plate when said shaft is assembled on said casing, and means for locking said key plate on said crank piece in a given angular position with respect to the axis of said first mentioned portion thereof.

3. A device according to claim 2 in which the key plate is provided with an aperture having a toothed edge, the device further including a member carried by said first mentioned portion of revolution, said member having a toothed outline of the same shape as said aperture, so that said key engages said member in any of a multiplicity of positions about the axis of said portion.

4. A device according to claim 3 further including a plate provided with an aperture of the same shape as that of said key plate applied against one face of said member and said key plate with its teeth out of line with those of said key plate and said member, and means carried by said plate and bearing on the other face of said key plate for preventing displacement thereof in the axial direction.

5. A device according to claim 4 in which the last mentioned means consist of lugs carried by said plate and adapted to be folded against the last mentioned face of said key plate.

6. In a device, a casing and two intermeshing pinions mounted in said casing, in combination with a crank piece including two portions of revolution having their axes eccentric with respect to each other, one of said portions being housed in said casing with angular adjustment about its axis and the other acting as a journal for one of said pinions, a key plate carried by the first of said cylindrical portions transversely thereto, said key plate having an outline eccentric with respect to the axis of said last mentioned cylindrical portion and being adjustable angularly about this axis, said casing being provided with an aperture having an outline of the same shape as that of said key plate, said aperture being adapted to accommodate said key plate when said shaft is assembled on said casing, and means for locking said key plate on said crank piece in a given angular position with respect to the axis of said first cylindrical portion thereof.

ARILLE RORIVE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 0 1,171,347 Morse Feb. 8, 1916 1,602,740 Bechler Oct. 12, 1926 1,712,956 Gustafson May 14, 1929 FOREIGN PATENTS 55 Number Country Date 172,159 Switzerland Sept. 30, 1934 421,373 Germany Nov. 10, 1925