US1525994A - Machine drive - Google Patents

Description

E. R. HYDE momma DRIVE 2 Sheets-Sheet 1 Filed Dec. 7, 1922 INVENTOR ATTORNEYS.

E. R. HYDE MACHINE DRIVE Feb. 1925.

Filed Deg. 7, 1922 2 Sheets-Shee INVENTOR ATTORNEYS.

Patented Feb. 10, 1925.

ELWIN R. HYDE, O1? BBIDGEPORT, CONNECTICUT, ASSIGNOR TO THE BRIDGEPORT SAFETY EMERY WHEEL COMPANY, INCORPORATED, 0F BBIDGEPORT, CONNECTI- OUT, A CORPORATION OF CONNECTICUT.

MACHINE DRIVE.

Application filed December '7, 1922. Serial No. 605,381.

To all whom it may concern:

Be it known that I, ELWIN R. HYDE, a citizen of the United States, residing at Bridgeport, county of Fairlield, State of Connecticut, have invented an Improvement in Machine Drives, of which the following is a specification.

This invention relates to machine drives and particularly to a driving connection between two shafts or spindles which rotate at a fairly high speed.

It is an object of my invention to provide a. driving means between such shafts which will not become overheated in operation and in which means is provided for cooling the power transmitting means between the shafts or spindles.

It is a further object of the invention to provide means whereby the driving connection may run in a bath of oil with means for cooling this oil to thus keep the driving connection from becoming overheated.

ith the foregoing and other objects in view, I have devised the construction illustrated in the accompanying drawings. Although my drive is of general application it is adapted for running different types of machines, but for the purpose of illustration I have shown it as applied to a buffing lathe, and in the drawings- Fig. 1 is a front view of a buffing lathe showing my improved drive applied thereto.

Fig. 2 is an end view thereof looking from the left of Fig. 1.

Fig. 3 is a top plan view of the drive with a portion of the upper section of the enclosing casing broken away to more clearly show the construction.

Fig. 4: is a longitudinal section substantially on line H of Fig. 3, and

Fig. 5 is a transverse section through the casing substantially on line 5-5 of Fig. 4.

With A. C. motors for two or three phase equipment the standard windings for buffing machines are usually for 1800 or 3600 M.-and'there is nothing in between. However, in buffing practice the bulk of the buffing spindles are operated at from 2200 to 2800. R. P. M. according to the size of the buff, the general practice being to run a 12" buff at about 2500 R. P. M. and as buffers are accustomed to working on spindles running at this speed it is very diflicult to get them to operate with buds running at other speeds, therefore, if the motors are directly connected to the buffing spindles these spindles either run too slow or too fast. Therefore, in order to'use these motors and secure the proper speed for the spindles it is necessary to provide some form of drive between the motor and buffing spindles which either give a step-up drive when the low speed motor is used, or a step-down drive when the high speed motor is used.

For these relatively high speeds various types of driving means may be used, but I have found that the improved silent chain drive running over suitable sprockets on the spindles is most satisfactory, asusually the motor and builing spindles are fairly close together in ordinary operation. However, under the high operating speed these drives quickly become overheated and l. have, therefore, provided means for maintaining them at the proper temperature.

Referring now to the specific application illustrated, 10 represents the base or pedestal upon which the shaft or spindle 11 to be driven is mounted to rotate in suitable bears ings 12, and in the present instance this shaft carries suit-able buffing. wheels 13, although of course other tools may be operated thereby if desired. Extending from therear of the pedestal is a sup-porting bracket 1 L on which is mounted the electric motor 15 for driving the spindle 11 and this motor rotates the driving shaft 7 or spindle 16. These shafts aresubstantially parallel and spaced a suitable distance from each other. On the motor spindle 15 is a sprocket 17, and on the driven spindle 11 is a sprocket 18 over which runs a suitable silent chain 19 of the usual construction. As this chain and sprocket drive is of standard construction I have not shownit in detail, but have merely indicated it in, outline. The sprockets 17 and 18 areof course given different sizes depending upon the relative speed desired between the two spindles. In the pres ent layout the high speed motor is used sothat a step-down drive to the tool spindle is employed and thus the driving sprocket 17 is smaller than the driven sprocket 18.

As this chain is driven at a relatively high speed it soon becomes unduly heated unless some means is provided for maintaining it at theproper temperature. For this purpose I enclose the driving means in a suitthe air.

able casing, preferably comprising an upper section 20 and a lower section 21 secured together by suitable flanges 22 through which pass suitable screws or bolts 23. The lower section is adapted to hold a suitable "oath of" oil, as indicated at 2%, which is of suflicient neight to come up about the lower portion of the chain. Even with this oil bath I have found that the highA-speed tends tocause the drive to become unduly heated and I have, therefore, I provided means a for cooling the oil and thus the drive. Of course when the drive operates the oil is thrown against the ends ofthe casing, and in vfact 'there is more or less of a fine spray-of oil within "the casing as it is thrown out by the chain as it passes over the sprockets. I have, therefore, provided on vthe neuter walls of the casing suitable heat radiating :ribs or fins 25 which will-conduct heat away from the casrng and the-011 "to the surrounding atmosphere. 'Io suppleinenttl-ie cool ing :action :of these fins I also provide means for circula'ting through the casing a cooling fluid, such as arr, :and as thei'oil within the casing is more or less of afine spray this circulation covered with: a fine"wire n1csh screen '28 to keep dirt froin passin 'into the casing with and-preferably in the upper wallzof the casing 1 provide on outlet vopening 29 :for this air; This opening is placed soinewhat for-. we rdly of the sprocket '18 so that ,:-the oilq thrown off from the-chain passing over ithis sprocket will not'be thrown=out this opening. .I

If it is found desirable, however, suitable hemes on screens may beprovided in this out-- let opening toseparate any oil air-0111 the air should-it be foundthat oil is being-carried ou't'by the air.

' "130 also give a morenreliable lubrication for the cha1n'I provide means 'for collecting oilas'it runs down the innersi'rrface'of' the easing walls,-and dischargingithis 1011 onto the-inner sid'e of the "cha n such as the-upper'side 'ofthe lower run. This 11182111860111:

prises trough 30 open at its upper side and resting against the inner wall of the easingand having aportion extending inwardly, as shown at 31, between the upper and lower runs of the chain, and arranged to discharge the oil collected-bytheatrough 'ontothe top of the lower run. WVhere-the shafts, passthrou'gh the *side walls "of the casing I prefer to provide a suitable packing T-hegfan blades are preferably in-v clin'ed somewhat so :as to draw thezra-iri through the inlet opening .into the ;casi=ng,

zcasi ng t-ofcool the oil and chain.

around the same to prevent oil passing out on these shafts. Such a packing is shown in Fig. 3 and comprises preferably an annular groove in the'casing to hold asuitable packing 32'eni' oracing the shaft.

' It is believed the-operation will-beapparenti-from the foregolng description. As the cool a1r 1s drawn into the inlet opening 2 by the fan 26 it comes in contact with the finely divided oil thrown out by the driving means and cools the same. The airipasses out the outlet 29fand the'cooled oil flows to" .the bottoin of the :casing to be again picked yup ibyithetriving neans,or is conducted to the drive by ineansof the trough 30. As the 'oil is thrown against the casing-part of the heat is conducted therefrom and disseminated by thetins 25. -It will thus be seen that I have provided I-IHQELIIS whereby these short 'drives'inay be employed for relatively high speeds without overheating.

' l la'vingthusset forth the nature of my invention, what I ca-i111 is 1. In a, niachinedrive, two substantially parallel spaced sl1a='fts, sprockets secured to said-shafts, :a chain driveabout said sprockets whereby one shaft may be driven by the other, 'nieans for rotating the driving shaft,

a casingabout the -sprockets and chain and adapted to hold an Ol'ibdth for a portion the chain, and means within the casing for circulating a cording fluid through said casing. 7

v. 2. In a machine drive, two shafts, a driving connection between said shaft, a casing;

about, said driving means adapted to hold a bath of 0 11 fora port-101i of the driving means to run in, and-means within the cas- -i-ng, for circulating a--cooling fluid through said casing. 7 I V p p p In a anachinedrive, two substantially paua lle'l,shafts, sprockets secured to :said shafts, @a {driving chain connecting said sprockets, means for rotating one of said shafts, a casing enclosing the chain and- "sprockets and adapted to hold albath of oil 1 for a portion of the chain, and means within the casing for circulating air througlr'the l. In ainachine drive, two sh ing connection between said shafts, a casing enclosing said driving connection and pro vided with an air inletopening and an outlet opening, a fan adjacent the inlet 0penfts, a driv- I i-ng'driven by one of said shafts and arranged-to draw air into the casing through said openingpand a bath of oil in said casing about a portion 'ofsaid driving connection.

' '5. In a mach ne drive, two substantially parallel shafts, a driving connection between said shafts comprising sprockets seoured tothe shafts anda drivingchain rum ning on saidsprockets, a casing enclosing said driving connection and provided with an air inlet opening and an air outlet opening, a fan adjacent said inlet opening driven by one of said shafts and arranged to circulate air through the casing from said inlet opening to the outlet opening, and an oil bath in said casing enclosing a portion of said chain.

6. In a machine drive, twosubstantially parallel shafts, a driving connection between said shafts comprising sprockets secured to the shafts and a driving chain running on said sprockets, a casing enclosing said driving connection and provided With an air inlet opening and an air outlet opening, said casing being adapted to hold an oil bath for a portion of the chain, means for circulating air through the casing from the inlet to the outlet opening, and means arranged to direct oil from the interior walls of the casing to the inside of the chain.

T. In a machine drive, two substantially pa *allel shafts, a driving connection between said shafts comprising sprockets secured to the shafts and a driving chain running on said sprocket-s, a casing enclosing said driving connection and provided with an air in let opening and an air outlet opening, said casing beingada-pted to hold an oil bath for a portion of the chain, a fan adjacent the inlet opening driven by one of said shafts and arranged to circulate air through the casing from said inlet opening to the outlet opening, and a trough arranged to collect oil running down the inner surface of one of walls of the casing and direct it to the top or inner side of the lower run of the chain.

8. In a machine drive, a pair of shafts, a pair of sprockets carried by said shafts, a driving chain on said sprockets, a casing enclosing the sprockets and chain and con taining a bath of oil for a portion of the chain to run in, said casing being provided with an air inlet and outlet openings, a fan driven by one of the said shafts for circulating coo-ling air through said casing from the inlet to the outlet, and heat radiating fins on the exterior of the casing.

9. In a machine drive, a pair of shafts, a pair of sprockets carried by said shafts, a driving chain on said sprockets, a casing enclosing the sprockets and chain and containing a bath of oilfor a portion of the chain to run in, said casing being provided With air inlet and outlet openings, a fan driven by one of the said shafts for circulating cooling air through said casing from the inlet to the outlet, heat radiating fins on the exterior of the casing, and a trough arranged to collect oil running down the inner surface of the casing and direct it to the top or inner side of the lower run of the chain.

In testimony whereof I affix my signature.

ELWIN R. HYDE.

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