US2076723A

US2076723A - Eccentric piston pump or compressor

Info

Publication number: US2076723A
Application number: US49913A
Authority: US
Inventors: John O Heinze
Original assignee: HEINZE DEV Co
Current assignee: HEINZE DEV Co; HEINZE DEVELOPMENT Co
Priority date: 1935-11-15
Filing date: 1935-11-15
Publication date: 1937-04-13
Anticipated expiration: 1954-04-13

Description

April 13, 1937.

J. o. HEINzE ECCENTRIC PISTON PUMP OR COMPRESSOR Filed Nov. 15, 1955 2 Sheets-Sheet l INVENTOR. 0. JL/

April 13, 1937. .1. o. HElNzE 2,076,723

, ECCENTRIG PIsToN PUMP 0R COMPRESSOR Filed Nov. 15, 1955 2 Sheets-Sheet 2 Patented Apr. 13, y1937' UNITED sTATEs PATENT oFFicE ECCENTRIC PISTON PUMP 0R COMPRESSOR.

Application November 1'5, 1935, Serial No. 49,913

2 Claims.

This invention relates to apump or compressor of the oscillatory eccentric 'piston type.

In engines, pumps or compressors employing an eccentric oscillating piston, diiliculty has always 5 been experienced in preventing the products of combustion, fluid, or compressed air from leaking by the dividing wall or abutment to which the oscillating piston is pivotally connected from the intake to the exhaust side.

The present invention relates to a construction wherein the baille wall or abutment is so constructed as to obviate the possibility of leakage from the intake to the exhaust side of the piston and to accomplish this desired end it is found most desirable that the pivot member upon which the piston oscillates, be positioned within the cross sectional area of the piston and be firmly anchored in the walls of the cylinder. This also facilitates the accurate location of the pin relative to the axis of the shaft and permits of the use of a bafiie wall of extended cross sectional area and provides a very rigid pivotal support for the piston, also permitting the employment of bearing members for the pivot pin, free to turn upon this pin as the piston oscillates and also with the piston free to reciproca members which are positioned within a transverse slot or recess in the piston extending transversely thereof with the ends of these bearing members abutting the end walls of the cylinder.

Further the present arrangement permits the use of an abutment wall of extended thickness which may be formed at its inner end to closely engage the bearing members which may be curved concentric with the axis of the pivot pin and thus insure against leakage past the abutment; and it is also an object to provide an arrangement wherein the abutment wall may be provided with a shoe to engage the curved surfaces of the bearing members to make a tight joint, and this construction further lends itself to providing adequate lubrication of the contact surfaces and also adequate meansy may be provided for taking up wear caused by the sliding contact between bearing members and'walls of the piston slotl in relation to which these members move as the piston oscillates within the cylinder.

With the above and other ends in view theA invention consists inthe matters hereinafter set forth and more particularly pointed out in the appended claims, referencebeing had to the accompanying drawings, in which Fig. 1 is a transverse vertical section substantially upon the line I-I of Fig. 3, of a constructe relative to these bearing tion illustrative of an embodiment of the invention;

Fig. 2 is a sectional detail substantially upon the line `2--2 of Fig. l;-

Fig. 3 is a vertical section substantially upon the line 3-3 of Fig. 1, and

Fig. 4 is a cross sectional detail substantially upon the line 4-4 of Fig. 1.

As shown in the drawings, the pump or compressor comprises two cylinders placed sideby side, each cylinder comprising an outer peripheral hollow ring I and hollow disk-like heads or ends 2 and a common intermediate head 3, the peripheral ring-shaped walls ci the two cylinders being firmly secured between the heads'2 and in abutting relation to the intermediate head 3, by means of a plurality of transverse bolts 4 passing through the heads and peripheral ring walls to draw all into firm abutting relation.

The outer peripheral rings I are each formed hollow to provide a water circulating space between the outer wall of the ring and the inner Wall 5 which forms the wall of each cylinder 6. Each of the ring members I is formed with a connecting rib or web I intermediate its ends, the space at each side of this rib forming a water space for the purpose of cooling the cylinder and these spaces are in communication through openings 8 in the web at each side of a. thickened portion of the web which forms a stud 9 at oppo'- site sides of the casing or cylinder structure and which studs are bored longitudinally to provide passages I0 which open into the cylinders 6, the outer ends of these passages being closed normally, by screw plugs II which may be removed for the purpose of allowing any accumulation of fluid within the cylinders to be drawn olf. The circular disk-like piston I2 within each cylinder is also formed hollow with a hollow hub portion I3 adapted to receive a ring sleeve I4 between which and the exterior surface of an eccentric I5, roller bearings I6 are interposed. The eccentric I5 for each piston is secured to a shaft I'I in any suitable manner as by a key I8 and these e/ccentrics are positioned on the shaft-with the eccentric for one piston having its large side extending in one direction from the shaft and the eccentric for the other piston extending in a diametrically opposite direction.

Connecting the hub wall I3 of each piston with the peripheral wall thereof, are parallel Walls I9 and 20 which are spaced apart to form a slot 2I of extended Width therebetween, this slot opening through the ends of each piston and extending inwardly to adjacent the hub il thereof.

A tubular pivot pin 22 extends longitudinally of the slots 2| and wholly within said slots and 5 through the

heads

2 and 3, this tubular pivot member being rigidly secured in place by nuts 23 on its outer ends engaging the outer sides of tain a tight joint between the surfaces of the block" and the surfaces of the wall I9 and shim 25, the expansive force of the springs 26 tending to rotate the piston to bring the wall i9 into engagement with one side of the bearing block and exerting force against the opposite side of the block. The ends of these half bearings abut the end walls or

heads

2 and 3 of the cylinders and the outer ends of the halves of the bearing block are formed concentric with the axis of the pivot pin 22 to closely fit at all times the inner end of an abutment member 21 having an outwardly extending rib or shank portion .21a to engage within a slot in the wall or ring member of the cylinder and is formed with shoulders to engage and closely t against the inner curved surface of the cylinder wall, the inner end of this abutment wall 21 being formed concave to closely t against the convex outer ends or side of the two half bearings. This abutment 21 is also slotted longitudinally to receive a bar 28 adapted to engage the curved outer side of the bearing members 24 and slide thereon as these members rotate slightly with the eccentric motion of the piston, and this bar or shoe 28 is forced toward and into firm contact with the surface of the bearing block members by means of Vcoiled springs 29;'so that a very tight joint of extended width and length is provided between the bearing block members 24 and the concaved inner end surface `of the wall or abutment 21. This abutment, because of its width and the close fit of its lateral shoulders against the curved surface of the cylinder wall, provides a very rigid abutment and this abutment is further held against movement by one oi' the bolts 4 passing through the tongue or shank portion 21a of the abutment longitudinally thereof.

An inlet passage 30 is formed in the peripheral ring member forming the outer wall or walls of the cylinder, this inlet passage opening into. the cylinder adjacent one side of the abutment 21 and an outlet passage 3| is provided in the wall at the opposite side of the abutment, this outlet being controlled by a poppet valve 32 so that back pressure will not enter the outlet side of the cylinder.

By locating the pivot pin 22 within the slot 2| ofthe two pistons to extend across both pistons within the cross sectional area of these pistons, a

very rigid pivot is provided upon which the pistons oscillate, and by providing half bearing blocks in the slot in each piston upon this pivot pin, `these blocks completely fill the slot transverselyand provide an extended area of contact between the blocks and side walls of the slots and also between the blocks and pivot pin and betweenthe blocks and the abutment wall 21 so that there is no possibility of leakage from the inlet to the outlet side of the piston, and a tight Joint is runner insured by providing the shoe 2l, which is spring pressed, against the curved outer surface of the bearing members. The wedge strip or shim 2l further insures against leakage past the bearing members and the arrangement provides a free oscillatory movement of each piston.

As shown, the tubular pivot pin 22 may be utilized as a conduit for lubricant, one end thereof being closed by a screw plug 22 and a pipe 22 inserted in its opposite end. Lubricant may thus be supplied to this pin and may escape laterally from its bore through holes bored radially and communicating with grooves formed in the side or contact surfaces of the bearing members 24 to provide oil conduits I4, lubricant also being supplied to the outer surface of the pivot member through these radial openings. This film of oil supplied to the contact surfaces of the bearing members 24 also assists inpreventing leakage past these bearing members through the slot in which they are positioned.

Obviously changes may be made in the construction and'arrangement of partswithout departing from the spirit of the invention and I do not, therefore, wish to limit myself to the particular construction shown.

Having thus fully described my invention, what I claim is:-

l. A device of the character described comprising a cylinder having a peripheral wall and circular heads. a shaft mounted axially of said cylinder, an eccentric on said shaft, a circular piston in said cylinder upon said eccentric, said piston having a slot opening through the ends and l35 periphery thereof, a pivot pin extending through said slot in said piston longitudinally of said slot o and secured in the said cylinder heads, half bearv.

ing members in said slot upon said pin for rota-V tion thereon with the oscillatory movement of said piston, the outer end of said pair of bearing members being curved concentric with the axis of said pin and said pair being of alength equal to the length of the piston in which it is mounted, and an abutment wall projecting into said cylinder from the peripheral wall thereof, said abutment wall being of a thickness substantially equal to the width of said slot in said piston and extending inward to adjacent the open outer sidey of said slot with its inner end surface curved to'conform Vto the curvature of the outer surface of said pair of half bearing members, and means for yieldingly pressing one of said half bearings into close contact with one side of said pivot pin and through the rotative adjustment of .saidpiston caused thereby, to press the other half bearing into rcontact with said pin and with the opposite sidewall of said slot, said cylinder being formed with an inlet passage at-one side of said abutment wall and an outlet passage at the opposite side.

2. A device of the character described and as characterized in claim i, and wherein one side wall of said slot in said piston is formed by a shim member of plate form, and yieldable means is interposed between said shim and one side wall of said slot to fome the said shim into firm contact with the adjacent surface of one half bearing and through the rotative adjustment of said piston caused by force applied to said shim, to force the opposite side wall of said slot into firm contact with the surface of said other half bearing.

JOHN o. HEINzE.