US761735A - Combined pump and motor. - Google Patents

Description

N 761 735 PATENTEDJUNE.7,1904.

H. H. WESTINGHOUSE 6: B. M. HERB". v

COMBINED PUMPAND MOTOR. AAAAAAAAAAAA ILnn June, 1000;

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. 1- y" I] 19 a my 'lmm NNNNNNN RS m: NORRIS PEYERS co uo oumo wmhw ssssss UNITED STATES Patented June '7, 1904.

PATENT OFFICE.

HENRY H. WESTINGHOUSE, OF EDGEVVOOD, AND EDWIN M. HERE, OF PITTSBURG, PENNSYLVANIA, ASSIGNORS TO THE WESTINGHOUSE AIR BRAKE COMPANY,

TION or PENNSYLVANIA.

OF PITTSBURG, PENNSYLVANIA, A CORPORA- COMBl-NED PUMP AND MOTOR.

SPECIFICATION forming part of Letters Patent No. 761,735, dated June '7, 1904.

I Application filed June 6, 1900. Serial No. 19,302. (No model.)

To all whom, it may concern:

Be it known that we,HENRY H. WESTING- HOUSE, residing at Edgewood, and EDWIN M. HERR, residing at Pittsburg, in the county of Allegheny, State of Pennsylvania, citizens of the United States, have invented or discovered a certain newand useful Improvement in a.

Combined Pump and Motor, of which improvement the following is a specification.

The object of our invention is to provide an improvement in power-actuated pumps; and

it consists in a new and. improved construction and arrangement of a combined pump and motor and in means whereby relative adjustment of the motor and pump may be effected to comply with the requirements as to adjustability of the power-transmitting mechanism between the motor and the pump; and it further consists in certain combinations and features of construction, ashereinafter set forth.

In the accompanying drawings, which illus- 'trate ourlnvention, Figure 1 1s a vertical secembodied in a combined electric motor and aircompressing pump which is specially adapted to be employed for supplying air to an airbrake system, the armature of the motor being connected by a power-transmitting mechanism with the crank-shaft of the pump, and

it provides a construction in which all of the mounted on the base and so connected with the casing of the transmitting mechanism that it may be easily and quickly moved relatively thereto and secured in the desired position when adjusting or bringing the parts together.

The motor, the pump, and the transmitting mechanism are completely inclosed by their casings and so connected that they are dust and dirt proof, as well as proof against water or moisture from the outside, and the necessity for an additional outside casing covering the whole is dispensed with, The motor employed is preferably an electric motor; but our invention is not limited to the particular form of motor, and while we have shown a.

pump with two cylinders one or any greater number may be employed.

In the drawings the pump-cylinder 1, the crank-casing 2, the base 8, its extension 4:, and the casing 5 of the transmitting mechanism are preferably formed in one integral casting, and the crank-casing is provided with an opening in. its top which extends very nearly the whole length of the casing and is usually kept closed by the cover or bonnet 6, which may be readily removed to permit inspection or removal of parts. The cylinders 1 are closed'at their outer ends by a bonnet 8, in which are formed the valve chambers and passages through which the air is supplied to and discharged from the pump, and the pistons 9 and 10 are connected, by means of the connecting-rods l1 and 12,with the cranks 13 and-1 L on the shaft 15, the axis of which is out of line with and somewhat below the axes of the cylinders. The crank-chamber is kept partially filled with oil to a height sufficient to permit the crank-pins to dip therein when the shaft rotates- ,One end of the crankshaft projects into the gear-casing 5, and mounted thereon isa gear-wheel16, provided with double helical teeth which engage with similar teeth on a pinion 17 which is mounted on one end of the'armature-s'haft 18 of the electric motor 19. A removable bonnet 5 covers one sideof the gear-case.

The electric motor 19 is mounted on and secured to the extension I of the base of the pump-casing by bolts 20, which pass through the slots 21 in the flanges 22, which are formed integral withthe closed casing of the motor.

The extension or projection 23 on one end of the motor contains a bearing for the armature-shaft and is provided with a flange 2 1, which fits against and makes a tight joint with the wall of the gear-casing 5, thereby closing the opening 25, through which the armatureshaft projects into the gear-casing. The width of the opening 25 and the width of the flange 24 are such that the motor may be moved to a considerable extent in a direction parallel with the. plane of the flange 24 without uncovering the opening 25, the movement being permitted by the slots 21 in the flanges 22 and the slots 26 in the flange 24 when the bolts 20 and 28 are slacked up. This provision permits adjustability of the armatureshaft 18 and its pinion 17 relatively to the wheel 16 and shaft 15.

Our improvement is not limited to the employment of the particular form of gearing shown or to the employment of spur-gearing, as the shafts 15 and 18 may be provided with sprocket-wheels, and motion may be transmitted from one to the other by means of a chain, and when such transmitting mechanism is employed our improvement is of special advantage, as it permits the shifting of the sprocketwheels away from or toward one another, and the size of the opening 25 and of the space into which it opens within the gearcase is such as to permit the employment of different-sized pinions or wheels on the armature-shaft in case it is desired to vary the velocity ratio of the pump-shaft and motorshaft in order to change the speed of the pump relatively to that of the motor.

The pump is intended to be operated so that the crank-shaft will turn in the direction indicated by the arrow (4 in Fig. 1, and the location of the axis of the crank-shaft below the plane of the axes of the cylinders and pistons will have the effect when the shaft is so rotated of decreasing the angularity of the connecting-rods relatively to the axes of the pistons during the compression stroke of the pistons-that is, the angularity will be less than it would be if the axis of the shaft and the axes of the pistons were in the same plane. As the pistons are reciprocated back and forth in the cylinders the volume of the space in the crank-chamber and on the left of the pistons will vary and cause a variation of pressure within the crank-chamber if the chamber be air-tight, and in order to prevent such Variation of pressure we provide an air-vent and oil-trap for permitting the passage of air between the crank-chamber and the atmosphere without permitting any escape of oil. The device for this purpose is shown in Fig. 3 of the drawings and comprises a tubular portion 27, which is secured to the bonnet 6 of the crank-ease and extends downward some distance into the chamber below the bonnet. On the upper portion of the tube 27 is a shell .28, which is preferably formed integral with the tube and which is provided with openings 29, through which and through the tube communication between the crank -ehamber and the atmosphere is established. From the top wall of the shell 28 an annular flange 30 extends downward below the openings 2.) far enough to screen the openings 2%) and to act as a bafller to prevent the escape of any oil from the crank-chamber which may reach the chamber in the shell. An annular projection 31 is formed with a downward slope to facilitate drainage of oil from the chamber within the shell. In order to prevent so far as possible the splashing of oil directly into the tube 27, we locate it near the end of the bonnet and directly over the shaft-bearing, so that any oil which drips down through the tube 27 will fall into the oil-cup 32, which is shown by dotted lines in Fig. 2 of the drawings and which is located on the top of the bearing 33.

The relative arrangement of the pump and motor forms a well-balanced construction and the position of the bonnet on the crank-casing permits of easy access to the crank-chaml)er without requiring the removal of the motor or other parts of the pump than the bonnet.

We claim as our invention and desire to secure by Letters latent 1. In a combined pump and motor, the combination, of a pump-cylinder, a crank-casing, and a base for the crank-casing, all formed in one integral casting; an integral extension of the base,a motor having a rigid support mounted on the extension, a piston in the cylinder, a shaft in the crank-casing to which the piston is connected, and mechanism for transmitting motion from the shaft of the motor to the shaft of the pump.

2. In a combined pump and motor, the combination, of a pump-cylinder, a crank-casing, and a base for the casing all formed in one integral casting; an integral extension of the base on the opposite side of the casing from the cylinder, an electric motor having a rigid support mounted on the extension, a bonnet or cover on the crank-casing which is adapted to be removed without moving the motor, a. piston in the pump-cylinder, a shaft to which the piston is connected, a gear-casing at one end of the crank-casing, and mechanism in the gear-casing for transmitting motion from the motor-shaft to the pump-shaft.

3. The combination, of a pump-cylinder, a crank-casing, a gear-casing on one end of the crank-casing and formed integral therewith, a piston in the cylinder connected to a shaft in the crank-casing, an electric motor having a shaft parallel with the shaft in the crankcasing and extending into an opening in the gear-casing, a casing inclosing the motor, means carried by the motor-casing for closing the opening in the gear-casing, and mechanism for transmitting motion from the motorshaft to the shaft in the crank-casing.

4E. The combination, with a pump and its casing, of a gearcasing formed integral therewith, an openingin the gear-casing to receive a motor-shaft, a motor for driving the pump, and means for connecting the motor-casing with the gear-casing so as to cover the opening in the gear-casing; and means whereby the motor may be adjusted relatively to the gear-casing without uncovering the opening in the gear-casing.

5. The combination, with a pump and its casing, of a gear-casing formed integral therewith, an opening in the gear-casing to receive a motor-shaft, an electric motor for driving the pump, a casing surrounding the motor, a flange on the motor-casing covering the opening in the gear-casing, and means whereby the motor and its casing may be adjusted relatively to the gear-casing.

6. The combination, in a pump, of two cylinders, pistons in the cylinders connected to cranks on a shaft in a closed crank casing, bearings for the shaft at either end of the crank-casing, an air-vent and an oil-trap therein, through which the interior of the casing is connected with the atmosphere and which is located over one of the shaftebearings to one side of the plane of rotation of the cranks.

7. The combination, with a pump having a closed crank-casing, of means, for connecting the interior-0f the casing with the atmosphere and for trapping oil so as to prevent its escape fromthe casing to theatmosphere, comprising a shell having perforations therein, a screen or baflie-plate formed integral with the top of the shell and projecting downward inside of the openings, or perforations, and a tubular extension formed integral with the shell and by which it may be secured to the crank-casing. r

8. In a combined pump and motor, the combination with a horizontal single-acting cylinder and a piston therein, of a crank-shaft to which the piston is connected and whose axis is out of line with axis of the cylinder, a casing inclosing the crank-shaft, an adjustable electric motor on the opposite side of the casing from the cylinder, and gearing connecting the motor-shaft with the crank-shaft.

In testimony whereof we have hereunto set our hands.

HENRY H. WESTINGHOUSE. EDWIN M. HERB. Witnesses:

R. F. EMERY, T. J. HOGAN.

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