US2592247A - Variable capacity pump - Google Patents

Description

April 8, 1952 F. 5. core: 2,592,247

VARIABLE CAPACITY PUMP Filed May 14, 1946 v 5 Sheets-Sheet l l I :mi' 1 l I l3 INVENTOR.

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VARIABLE CAPACITY PUMP Filed May 14, 1946 5 Sheets-Sheet 2 INVENTOR. FRANK 5. C05.

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VARIABLE CAPACITY PUMP Filed May 14, 1946 5 Sheets-Sheet 5 INVENTOR. FRANK 5. COE...

Patented Apr. 8, 1952 VARIABLE CAPACITY PUMP Frank S. Coe, Springfield, Mass., assignor to American Bosch Corporation,

Springfield,

Mass, a corporation of New York Application May 14, 1946, Serial No. 669,645

This invention relates to a fluid pump or motor of the vane type having automatically variable capacity or output.

An object of this invention is to simplify the construction and cost of variable capacity pumps or motors of the type set forth and wherein the pumping volume of the pump is automatically adjusted to meet the required output therefrom.

Another object of the invention is to provide a relatively simple and economical pump or motor construction as set forth above which is capable of adjustment for maximum pumping efficiency and in which any wear of the movable capacity controlling member will be distributed over the member thereby prolonging the usable life of the pump.

Another object of the invention is to provide a relatively simple and economical construction of pump or motor of the type set forth wherein the movable capacity or output varying member may comprise'a plain cylindrical ring and which may be adjusted for maximum efiiciency.

Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts as the preferred form has been shown by way of illustration only.

Referring to the drawings:

Fig. 1 is a front view of a pump embodying the invention;

Fig. 2 is a bottom view-thereof;

Fig. 3 is a side view thereof;

Fig. 4 is a rear view thereof;

Fig. 5 is a sectional view taken substantially on line 55 of Fig. 3 looking in the direction of the arrows;

Fig. 6 is a sectional view taken on line 6-6 of Fig. 5, looking in the direction of the arrows;

Fig. '7 is a front view of the port side of the cover;

Fig. 8 is a sectional view taken on line 8-8 of Fig. '7, looking in the direction of the arrows;

Fig. 9 is a fragmentary view, similar to Fig. 5, but showing a modified form of the invention;

Fig. 10 is a view similar to Fig. 5 but showing a modified form of the invention; and

Fig. 11 is a fragmentary side view of the form of the invention shown in Fig. 10.

Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the device shown embodying the invention comprises a housing member l having a bore-2- which' may be cylin- 3 Claims. (01. 10s 120) dl'ical for facilitating manufacture thereof and having the plate members 3 and 4 secured to the opposite sides thereof by suitable screws orthelike and when secured to-said housing member" I, forming a substantially cylindrical chamber the bore 2 of said housing member I The bore or."- chamber 2 of the housing member I is adaptedto i contain the operative elements of the" pump oonstructionr v The end plate 3' is provided with the coupling 5 for connection to a fluid supply and adapted to supply fluid to the pumping chamber 2 through Iv the duct 6 and supply groove 1 on the inner wall of the plate 3 and which communicates with the duct 6 through the port 8. The end plate 3 is- The end plate 4 is provided with the'hub per-- t-ion l3 in which is journaled the shaft M for driving the pumping member in the chamber 2.

' The shaft l4 may be driven in any suitable man'-.

ner and is provided with the lubrication groove I5 adapted to receive lubrication through the groove IS in the hub l3, and thereby provide lubrication to the apparatus with which the pump is associated.

It is pointed out that the shaft [4 for supporting and driving the. pumping member is journaled" in only the hub I3 of end plate 4 thus allowing the complete assembly of the pumping elements with end plate 3 removed therefrom and" also allows removal of the end plate 3 without dis-- turbing" the shaft I 4 or pumping elements." 1

In the chamber 2, the "pump rotor I1 is keyed- 1 to the shaft HI which is adapted to drive said? member. A series of'radial slots H3 in each of which is dis-' posed a radially slidable vane l9. The inner ends The pump rotor 1''! is provided with a of the slidable vanes IS'engage the rings 20 and- 2|, one of Which'is provided on each side-of the P rotor= I1 and the outer ends of the vanes l9 are adapted to engage the inner peripheral surface 22 of the annular member 23 which surrounds the roto'r I! in the chamber 2.

The rotor H has a hub portion or rotor keyed to the shaft. M as; described above; has an annular recess surrounding the shaft l4 and the width. of this portion of the rotor ll is less than the' vanes l9 which reduction in width provides recesses on either side of thehulo for receiving one ofthe rings Wand 2| each of which engages'an inner edge portion of each of the several vanes l9 which are mounted in slots on the rotor I1. One of the rings and 2| is positioned in each of the annular recesses in the side of rotor or hub and these rings 20 and 2| retain the outer ends of the vanes IS in engagement with the inner periphery of the ring 23 at all times regardless of the position of the ring 23 relative to the rotor 11 and because these rings 20 and 2| are free to move in said recesses and thereby vary their eccentricity relative to the rotor l'l corresponding to changes in eccentricity of the ring 23 so that whatever the eccentricity of said ring 23 and vanes l9 said rings 20 and 21 maintain their peripheral contact with the inner edges of the vanes IS.

The annular member or ring 23 is smaller in outer diameter than the bore 2 and larger in inner diameter than the rotor I'l whereby the said ring 23 may be automatically moved in said chamber 2 into positions of varying eccentricity relative to the rotor I! by fluid pressure to thereby vary the pumping action of the vanes l9 and thus vary the quantity of fluid pumped. The ring 23 is preferably a plain cylindrical ring having only cylindrical internal and external surfaces which are relatively simple and economical to manu facture. To form this ring the blank may be turned, hardened and then ground. This provides a wear resisting ring which is free to creep or rotate when automatically adjusted by varying pumping requirements to thereby distribute the wear over the surface of the ring and not have the wear concentrated at a single portion of the ring.

The housing I has the opening 24 in which is positioned the hollow bearing member 25 which is retained in engagement with the ring 23 by the spring 26 which is retained in operative position in the opening 24 and hollow bearing member 25 by the plate 21 which is retained in position on the housing by the screws 28.

The spring 26 and bearing member 25 normally urge the ring 23 and vanes I9 to position of greatest eccentricity, as shown in Fig. 5, which is the position of greatest pumping volume of the pump, and pressure of the fluid between the rotor I"! and ring 23 causes automatic movement of the ring 23 to proper degree of eccentricity relative to the rotor I! to increase or decrease the eccentricity and therefore pumping action of the vanes IS.

The pressure of the spring 26 can be controlled or varied by employing a spring having the desired force or by changing the spring to change the force, or if desired by providing an adjustable fitting for the spring, and this in turn controls the fluid pressure necessary to change the eccentricity of the ring 23 and therefore controls the output of the pump.

To guide the ring 23, the pins 28a are positioned in openings through the opposite walls of the housing I. These pins 28a are pressed into position through openings in the walls of the housing I and sealed therein to prevent leakage of the fluid. If desired, and to prevent any possibility of leakage of the fluid from the chamber 2, the pins or rollers 29 may be employed in place of the pins 28a and these may be loosely positioned in transverse slots through the housing I in the sides of the bore 2 as shown in Figs. 10 and 11.

In order to set the vanes to give best efficiency in pumping the adjusting screw 30 is provided through the wall of the housing substantially di- 4 ametrically opposite the spring 26. This screw extends through the wall of the housing I and engages the outer periphery of the ring 23 when the pumping elements are in position of greatest eccentricity relative to the rotor IT, as shown in Fig. 5.

By'adjusting the screw 30, the ring 23 may be adjusted toward the spring 26 until the vanes on the side of the rotor I1 toward the spring 26 are adjusted for minimum clearance with the ring 23 when the pumpingelements are in position for best efficiency in pumping.

It is pointed out that the ring 23 has a continuous unbroken interior cylindrical surface adapted to be engaged by the vanes I9 for pumping action and that the slots or grooves 'l and III are provided in the surface of the end plate 3 to insure an unrestricted flow of the fluid into and out of the pump by the vanes l9.

In the arrangement shown in Fig. 9 the bearing member 25 is provided with a projection 3| which enters an opening 32 in the adjacent side of the ring 23 and guides said ring 23 during the movement of said ring 23 when the position of the ring is varied to vary the output of the pump.

Upon the starting of rotation of the rotor ll the ring 23 will be automatically moved to correct eccentricity commensurate with the output required from the pump due to the pressure of the fluid against the interior surface of said ring. If fluid in excess of output requirements is being pumped by the pump, the resulting increase in fluid pressure between the rotor l1 and ring 23 on' the side thereof towards the spring 26 causes prompt movement of the ring 23, against the pressure of said spring 26, toward a less eccentric position relative to rotor H, which automatically reduces the pumping action of the vanes I9 to a point in keeping with output requirements of the pump. In this manner the pump will automatically adjust itself to delivery fluid only in the amounts required by the device which it supplies.

From the above it will be seen that I have provided simple, efiicient and economical means for obtaining all of the objects and advantages of the invention.

Having described my invention. I claim:

1. In an automatically variable delivery fluid pump or the like, a housing having a pumping chamber and fluid supply and delivery means communicating with said chamber, a rotor and a plurality of vanes in said chamber, a ring member in said chamber and surrounding said rotor and vanes, said ring member having a solid wall with a continuously curved unbroken outer surface and resiliently urged means engaging said ring member for normally urging said ring member and vanes relative to said rotor for maximum pumping action by said vanes and a plurality of pin members extending into said chamber through said housing and sealed in said housing and engaging the periphery of said ring at spaced points only for guiding said ring during any movement thereof.

2. In an automatically variable delivery fluid pump or the like, a housing having a pumping chamber and fluid supply and delivery means communicating with said chamber, a rotor and a plurality of vanes in said chamber, a ring member in said chamber and surrounding said rotor and vanes, said ring member having a solid wall with a continuously curved outer sur- :face, resiliently urged means engaging one side of said ring member and adapted to normally urge said ring member and vanes relative to said rotor for maximum pumping action by said vanes and adjustable means engaging said ring member whereby said ring member may be adjusted against the action of said resiliently urged means to position of maximum pumping efficiency and a plurality of pin members extending into said chamber through said housing and sealed in said housing and engaging the periphery of said ring at spaced points only for guiding said ring during any movement thereof.

3. In an automatically variable delivery fluid pump or the like, a housing having a pumping chamber and fluid supply and delivery means communicating with said chamber, a rotor and a plurality of vanes in said chamber, a ring member in said chamber and surrounding said rotor and vanes, said ring member having a solid wall with a continuously curved unbroken outer surface and resiliently urged means engaging said ring member for normally urging said ring member and vanes relative to said rotor for maximum pumping action by said vanes and a plurality of stationary members extending into said chamber through said housing and sealed 6 in said housing and engaging the periphery of said ring at spaced points only for guiding said ring during any movement thereof- FRANK S. COE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,943,929 Rayburn Jan. 16, 1934 2,192,660 Johnson Mar. 5, 1940 2,236,556 Wunderle Apr. 1, 1941 2,318,292 Chandler May 4, 1943 2,318,337 Schlosser May 4, 1943 2,348,428 Tucker May 9, 1944 2,423,271 Talbot July 1, 194'? 2,433,484 Roth Dec. 30, 1947 FOREIGN PATENTS Number Country Date 380,900 Great Britain Sept. 29, 1932 513,440 Germany Nov. 2'7, 1930

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