US1328340A - Motor-driven compressor - Google Patents

Description

L. D. SAUNDERS. Mo'ToR DmvEN COMPRESSOR.

APPLICATION FILED OCT- 6, |914- Patented Jan. 20, 1920.

3 SHEETS-SHEET 1.

IIN

WTNESSES L. D. SAUNDERS. MOTOR DRIVEN COMPRESSOR. APPLICATION FILED ocr. e. I9I4.

Patented Jan. 20, 1920.

3 SHEETS-SHEET 2.

WIITNESSES L. D. SAUNDERS. MOTOR DRlvEN COMPRESSOR.

APPLICATION FILED OCT- 6, |914.

Patented J an. 20, 1920.

3 SHEETS-SHEET 3.

mw QN wmf lIHlIII .I.: I I

WITNESSES R BRAKE COMPANY, 0F WILMERDING,

MOTOR-DRIVEN COMPRESSOR.

Specification of Letters Patent.

Patented Jan. 2o, 1920.

Application filed October 6, 1914. Serial No. 865,302.

To all whom t may concern:

Be it known that I, LAWRENCE D. SAUN- lnans, a citizen of the United States, residing at lVilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a certain new and useful .lmprtwement in Motor-Driven i Compressors, of which improvement the following is a'specitication.

This invention relates to air compressors driven by electric motors, and more particularly to such compressors as are ernploy'ed upon electric cars for compressing air for the air brake system. When used in this class ot' service, the' compressor is usuall)v suspended beneath the car body in such position as to be exposed to dirt, dust., rain, snow and other elements, and must, therefore. be. thoroughly inclosed and protected therefrom. The available space for the compressor, particularlyr the vertical dimension, is also usually very limited, and one of the objects of my invention is to provide an improved compact structure of. this type in which the. parts are inclosedand having its vertical height reduced to a minimum. Another object is to provide an improved driving gear connection between the motor and compressor. and means for lubricating the same. Another feature comprises animproved construction of motor casing wherebv the field yoke is independently supported and the armature may be readily7 inspected or removed for repairs when necessary. These and other features of my improvement. will be hereinafter more fully described. and set forth in the claims.

ln the accompanying drawings: Figure 1 is a horizontal section of a motor compressor embodying my improvement; Fig. 2, a transverse vertical section taken o n the line .@2 of Fig. 1 g and, Fig. 3, a front elevation with a portion of the casing broken away to show the driving gears and bearings for the armature shaft.

According to the construction shown, my improved design comprises a compressor having a closed crank casing, 5, with one or more horizontal cylinders, 6, having the usual suction and discharge valves and opening at their rear ends into the crank chamher` and containing pistons, 7, connected b v rods. 8, with the cranks on the crank shaft.

9, which is mounted in bearings, 10, allv tendency of the shaft, at

within the inclosed chamber. At one end the crank shaft is extended beyond the bearing, and is provided with the driving gear, 11, the crank casing also being extended to inclose sai gear.

The motor casing comprising a rear housing, 12, field yoke, 13, and front housing, l-l, is located at the side of the compressor casing, and contains armature, 15, mounted on shaft, 16, and extending through the rear housing, 1Q, and into the compressor casing. The side wall of the crank casing may e 'formed integral with the rear housing, 12. if desired, and a long bearing, 16a, is provided in the Sallie for the armature shaft, the armature being preferably of the overhung type having no bearing in the front housing. The armature shaft extends into the compressor casing in the same horizont-al plane with the crank shaft and the axes of the cylinders, and is provided with the,driving pinion, 17. meshing with the gear, 11, of the crank shaft. As the motor casing and the crank casing are of substantially the same vertical height, this location of the shafts in the same horizontal plane has the advantage of reducing the overall height ofthe machine to a minimum.

The armature shaft may also be extended with al beari g, 18, at its inner end formed in the compressor frame or cylinder. The driving pinion, 17, is thus located `between the two armature shaft bearings and serves to prevent any wabbling the same time giving a maximum life to the bearings with minimum wear and a quiet operation of the pinion and gear. An additional advantage derived from the use of the inner bearing for the armature shaft is that the shaft may be made much smaller in diameter than would otherwise be necessary, and consequently a smaller pinion may be used, which gives the desired speed of rotation and increases the efficiency of the operation.

The front motor housing, 14, is supported directly upon the rear housing, 12, by means of the stud bolts, 19, which pass through the eld yoke, 13. This yoke, which is preferably laminated, is thus independently sus- V pended between the front and rear housings,

and is not itself bolted to the casing; The front housing which covers the commutator end of the armature is also provided with tom of the crank case to porting bars, 26.

20, hinged at the bottom and" adapted to be dropped down to expose the armature and commutator for inspection or removal. The armature and its shaft may` thus be removed without taking down the compressor, and for the purpose of detaching the pinion from the shaft, a hand hole plate, 21, is provided on the compressor casing o `posite thev pinion, 17, whereby a wrenc may be inserted to hold the nut, 22, by which the pinion is fastened onto the shaft, when the shaft is rotated at the commutator end. The nut may thus be unscrewed, and the armature and shaft may then be drawn out through the front opening. By a reverse operation the parts may be replaced;

1n order tol lubricate all ofthe moving pants and bearings that require lubrication, oil is introduced into the bottom of the crank casing to a sufficient height that the cranks may splash therein during their revolutions. The oil is thus thrown upon the bearings, cylinders, and gears, to eectlv a thorough and continuousV lubrlcatloli. partition, 23, may be employed at the botseparate the gear casing from the oil inthe bottom of the crank case, and prevent the' oil from standing` at the same depthnupon the gear. The movement of the cranks, however, will throw considerable oil into the gear portion of the casing and the gear wil carry the same up to the pinion and armature shaft bearings without having to churn a large amount of oil unnecessarily. l The cover, 27, of the crank case also extends over the gears where it supports an oil defiector, 24, which drains into both armature bearings.

The compressor may be suspended beneath the car by three short vertical hangers, 25', 'bolted to the casing, and bent at right angles at their upper ends to hook over other sup- By means of the improved construction as above described, a very compact compressor structure .is produced having a minimum overallheight and occupying very little space beneath the car. v

Having now described my inventiomwhat I claim as new and desire to secure by Letf ters Patent is:

1. In a motor-driven compressor, the combination of a closed'crank casing, horizontal cylinders connected therewith, a crank shaft mounted in bearings within the crank cham.

a large door,

I ber, pistons connected .with the cranks, a

within the casing,

gear located on one end of the crank shaft a motor casing at the side of the compressor casing, its rear housing being formed integral with the side wall of the crank casing, and containing anelongated bearing at the cylinder side of the crank shaft and in the same horizontal plane Igear on the crank ,mg forthe inner end of the armature shaft ing, a nut on the therewith, an armature shaft mounted in said bearin and extendingv into the compressor casing, an armature on said shaft outside of said elongated bearing, a pinion carried by theI armature shaft within the compressor casing `and meshing with the shaft, and another bearsupported on the cylinder wall within the casing.` f

2. 1n a motor driven compressor, the combination of a closed crank casing, horizontal cylinders connected therewith, a crank shaft mounted in bearings within the, crank chamber, pistons connected with the cranks, a gear located on one end of the crank shaft within the casing, a motor casing at the side of the compressor casing, its rear housing being formed integral with the side wall ofthe crank casing, and containing an elongated bearing at the cylinder side of the crank shaft and in the same horizontal plane therewith, an armature shaft mounted in said bearing and extending into the compresser casing, an .armature on said shaft outside of said. elongated bearing, a pinion carried by the armature shaft within the compressor casing and meshing with the gear on the crank shaft, another bearing for the inner end of the armature shaft supported on the cylinder wall within the caspinion and the end bearing, and a hand hole cover on the side of the compressor casing opposite the pinion.

3. In a motor driven compressor, the combination of a closed crank casing,l horizontal cylinders connected therewith, a crank shaft armature shaft between the mounted in bearings within the crank chamber, istons connected with the cranks, a gear. ocated en one'end of the crank shaft within the casing, a motor casing at the side of the compressor casing, its rear housing being formed integral with the side wall of the crank casing, and containing an elongated bearing at the cylinder side of the crank shaft and in the same horizontal plane therewith, an armature shaft mounted in said bearing'and extending into the compressor casing,l an armature on said shaft outside of said elongated bearing, a pinion carried by the armature shaft within the compressor `casing and meshing with the gear on the crank shaft, another bearing for the inner end of the armature shaft supported on the cylinder wall within the casing, and an oil deiector located over said pinion and draining onto both armature bearings.

LAWRENCE D. SAUNDERS. Witnesses:

' A; M.ICLEMEN'rs,

" S. W. KnEFER.

Images