US863556A - Motor-driven air-compressor. - Google Patents

Description

A- PTEETEB AHIG.v 13,1907. E.. I). PRIEST 5.' BREW. MOTUR DRIVEN .AIR GGMPRBSSR. APPLICATION FILED Nov.2e.19o4.

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No. 863,556. PATENTED AUG. 13, 1907. B. D. PRIEST L E. J. BRING. MOTOR DRIVEN AIR COMPRESSOR.

APPLIGATON FILED NOV.26.1904.

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'UNITED srnrns EDWARD PRIEST AND EINAR J. BRING, Ol"

GENERALj ELECTRIC COMPANY FFICE.

AssIeNons To New YORK.

MOTOR-DRIVEN AIR-COMPRESSOR.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed November 26, 1904. Serial No. 234,378.

To all tollem lit may concern.'

l 5e it known that ,we, EDWARD DPRIEST, a citizen of the United States, and EINAR J. BRING, a subject of the l( ing of Sweden and Norway,

5 ectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Motor-Driven Air-Compressors, of which the following is a specification.

The present invention relates to motor driven air l compressors or pumps. g

Particular attention must be given to the design of units of this character in order to render them as compact as possible where they are employed upon railway cars or in other situations affording but little space for p l their reception; and where the motor is geared to the compressor or pump in order to cause the compressor to be driven at a considerably lower speed than the speed of the motor the difliculty of securing compactness is increased.

One of the objects of the present invention is to so arrange the motor relatively to the compresser that they are encompassed within a minimum space.

In compressors of any character it is impracticaole to expel all of thecompressed air from the cylinder or` cylinders at the end of the stroke of the piston and consequently at the instant the operating cranl; of the compressorpasses the center and the piston is at the end of its compressingI stroke, the pressure of the uid is exerted, not in opposition to the motor asbefore, but in unison therewith. Therefore, if the connection between the l motor and the compressor consists for example, of worm gearing, and the motor shaft possesses any material axial play, this 4sudden reversal of the relative directions of pressure between the compressed uid and the motor will tend to shift the motor shaft forcibly from lone extreme position to the other, thereby producing a noisy and injurious hammer blow. This blow will of course be repeated when the back pressure upon the piston has been diminished sufficiently to enable the worm to 4 0 again overhaul the teeth of the worm wheel, making two such. blows during each cycle of the piston. f

In one of its aspects the present invention contemplates means for preventing the occurrence of noisy blows due to the reversal of the relative pressure between the fluid within the compressor cylinder and the motor.

Further objects of the present invention will be apparent from the following description of one embodiment thereof. i l

In the accompanying drawings, Figure l shows in perspective a compressor arranged in accordance with the present invention; Fig. 2 is a transverse section showing the crank shaft and driving gearing, and Fig 3 is a longitudinal section showing the location o f the motor.

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l ther chamber an'olgwell ll ll is filled with lubricating oil which is carried upwardly by -worm 2 to bearing 5 and to worm-wheel 3;

Similar reference characters will be used throughout the specification and drawings to indicate correspondl ing parts.

The air compressor and motor maybe of any usual or preferred types, since the details thereof form no part of the present invention.

A is the air-compressor and B the motor. The shaft l of the motor is provided with a worm 2 which meshes with a worm wheel 3 connected directly with the crank-shaft 4 of the air compressor. portions of the worm and worin-wheelV are such that the actual speeds of the motor and the compressor may be the most efficient.

for the motor is much higher than the most efficient speed of the compressor, a comparatively large worin wheel is required, causing a considerable displacement of the point of application of the driving force from the axisl dimensions as much as possible the shaft of the motor is arranged at an incline with respect to the axis of the compressor cylinder or cylinders c e, the 'inclina- Y The relative pro- Since the most efficient speed of the crank-shaft. In order to vlimit the extreme being such that the motor casing b does hotpro ject to any great extent beyond the top or bottom of the casing a containingsthe worm-wheel and the cranK- shaft. upon a `.thrust bearing 5of any suitable character and theupper end 'within' a bearing 6'. ment' the compressor is arranged in a The lower end of the motor shaft l is seated By this arrangecompact form maybe supported beneath a car body, as indicated in Fig. 3, with the cylinders horizontal without bringing any portion, too near the ground. Furthermore by placing the motor shaft upon an incline, the back pressureof the fluid is opposed-by the weight of l:the motor armature and, in order to move themotor shaft axially when the crank-shaft passes the center, the back pressure must he great enough t0 lift the armature and shaft of the motor,-a condition which readily be prevented.

is formed. 11i operation, well from the .worm wheel some of'the oil drops into receptacle l0 as the wheel revolves. The oil may be distributed by gravity from the receptacle to any point at which lubrication is required. As the lubricant drops from the moving parts into chamber 8 it Hows back into well l1 through a hole l2 in partition `7. The 'inclination' of the motor axis performs a furpurpose: if the axis were horizontal, the lubricant.

A partition 7 divides the interior of the casing a into two chambers, 8 and 9, within which are arranged -the @rank-shaft and the worin gearing, respectively. Within the chamber 9, and near the top thereof, there isprovided a receptacle l0 which projects beneath the rim of the worm-wheel, while in the bottorn-ofxthe Joo would be free to-tlow along the shaft and into the armature of the motor; but by raising the armature end of the Shaft this is prevented.

By the present invention a compact. and noiseless construction is obtained and one particularly adapt-ed for use in street railway work Where tlievertical lspace Within which the compressor must. be placed is extremely limited.

Althoiighone iorin of the present. invention is illustrated in detail, we do notwish to limit the present vinvention to the details oi construction shown, except to the extent indicated in tlie appended claims..

What Weclaiin as new and desire to secure by Letters Patent of the United States, is,-

1. A motor driven air compressor comprising' a casing. compressor cylinders and pistons. a crank shaft from which the pistons are driven. hearings for said crank shaft in said casing. a motor in said casingvhaving its axis ar- 'ranged at an angle to the axes of the cylindersv a worm wheel on` the crank shaft, and a worm on the motor shaft nieshing with tht` worm wheel. the angle at which the nio-A ytor shaft and the axes of the cylinders are arranged being' such that the hack pressure of the compressor is opposed by the weight of the armature.

2. in a motor driven air compressor, a casing having lugs thereon by which it may be supported, compressorcylinders and pistons therein supported h v said easing. a erauk shaft from which iluI pistons :ire driri-u. journal hearing-s in said easing' lor supporting;- sail crank shal'l. a luplor in said'easiug; harina its axis arranged al au aug-le to the a'x s o1' the cylinders. a woriu wheel on said rrauk shaft. a worin on .the motor shalt meshing with said worin wheel. the angle at which the motor shaft and axes of the cylinders are arranged heilig such that the hack pressure ol the compresso at the end ol the stroke is opposed by thi` weight of the armature.

Il. A' motor driven air compressor comprising a. casina. compressor cylinders and pistons mounted therein. a crank shatt from which the pistons are driven. a inotor in said casing having.;l its axis arranged at an angle to the axes ol' the, cylinders. a worin wheel on the crank shaft. a worin on the motor shaft meshingl with said worin wheel, a step hearing in which the lower end of the motor shaft rests, an oil chainhcr surroundn;r said worin. an oil receptacle adjacent the upper portion of said worm wheel with a passage leading fr om said receptacle to the step hearing whereby oil carried up hv said worm wheel will irrigate said step bearing.

Inwitness whereof, we have hereunto set our hands this 25th-day of November. 19H4.

EDWARD D. PRIEST. EINAR J. BRING.

Witnesses:

BENJAMIN B. HULL,- HELEN ORFORD.V

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