US2537547A - Gear motor operator for boosters - Google Patents

Description

W) Nm. I wu P. c. PococK ET AL Filed Aug. l, 1947 .'{l'vj GEAR MOTOR OPERATOR FOR OOSTERS ill/lll lila Jan. 9, 1951 lNVENToRs PAUL C. PococK. HOWARD MIPURCEl-L BY i f'- r J JMJWVLJ ATTORNEYS mlilil my Patented Jan. 9, 1951 UNITED STATES PATENT OFFICE.

` Purcell, Philadelphia, Pa., assigoisf to H-P-M Development Corporation, Wilmington, Del., 'a

corporation o'f'ljlavvare Application August 1, 1947, serial No. 765,280 s claires, (cl. s-11) invention relates to hydraulic circuits, and particularly to hydraulic circuits employing Huid ,iiteiirs ofthe @vpc disclosed in the W" rl'ien'R, Tucker applicaties. Serial #5945413, Ile 18, 19e15L1`1w Patent amaand as sg to the 'same assignee as the present application.

The uid Dressur@ iierlsigr .disclosed in the Tucker ,applicdeis characterized by including a valve member which tbe driven in order to make .thesaid intensifier effektive. the valve member is not driven the intensifier is, in eiect, a'jclosed valve.V

flhischaracterlstic of .the fluid pressure intensier, .Y whiCll the Tucker @sensation isconcerne` is utilized to advantage by making the Said moverte? .selectively ftivs er .indienne me'relyjby controlling the driving o f the valve member. This sub an ally `simplifies the valvins nrblem in am' rv remi@ Ci'ciiii ,in vwhich .the muslims employed and @spatially in View Yof the -factgthat pressures up ard oi five and six thousand pounds per' Square' ifil sie delivered by the pressure intens der,

lf-he primary object of the present invention is to provide an improved arrangement for 4`selecivlv Starting and stopping th valve member `0f a hy'difende'v f tensifi'er thereby to .control its period of effectiveness. vMather @bled of ,this invention is w wonde duid cnfierable means responsive to pressures in the-circuit being llppld for controlling the eiect'iveness of a'nuid vpressure inten sii-ier.V

It is also an object vof this invention tprovide a control means for a Aiiuid pressure intensiiier ina hydraulic circuit such that' electic switches and aiiiiliary electric motors and `the like are entirely eliminated. Y

It is a still further object of this invention to provide-a J-inean's for selectively driving the valve member of a hydraulcintensierand to provide in ,combination vtherewith Vmeans for selectively controlling the vspeed of the valve member.

Illlese and other objects and advantages will become .more Aapparent upon reference tothe fllovving description taken in connection with-the accompanying drawings in which:

1Fgure-.1.is-adiagrainmatic View of a pressoircuit having .aipressure intensifier Witnta control means 4according to -this invention;

Figure l2 is airagmentary circuit showing a diierent manner of connecting Kthe control circuit; and

Figurelis a sectional View snowing a. now controlling-.valve to beemployed inthe control circuits of Figures 1 and 2.

General arrangement According to this inventionthere is provided a source ofpressure fluidsuch as a pump lforfsup- 2 plying actuating duid to ahydraulic motor such as a press rain. Connected between the pump and the rain is a iiui'd pressure intensifier adapted for'receiving the discharge of the pump and for converting'it to Ia higher' pressure and'dscharging it to the said ram. This intensier includes a valve member which must be driven during the period that the intensifier is elective. According to this invention there is provided aflud operable moto-r such as a gear motor, for driving the intensifier valve member.

In order to make the intensier effective dur-V ing anypredetermind D Qliod, means are provided for" only supplying' actuating liuid to the said gear motor during' that period, This is `preferably accomplished lbyy a normally closed valve positioned between thengejar motor and the pr`. es' sure side ci the hydraulic'circuit and adapted' for being operated into open position in response to a predetermined pressure in the said c iruit'. no# cording to one modification of this invention the supply pump is reversible in delivery and one port of the gear motor is connected with one sideof the pump and the othe port thereof is .'coimec'ted with the other side. The gear motor vthus runs in opposite dirctionsdepending onv which way the pump is delivering t'o"`the"suppiied circuit. According to another modification thegear moto-r has one port Vconnected with exhaust and 'itsother port .connected through normally closed valves with both .sides of the pump. The valves selectivelyopento .connect the gear motor with the pressure side of the lpump when it is desired to make the pressure .intensier effective.

The supplycircuit for the gear motor preferably .includes speed controlling means, such'a's a flow controllingvalve, whereby Athe speedof rotationof the intensier .valve member -isonly that necessaryfto vaccommodate vthe ,quantity of fluid being passed therethrough.

Sff'rcifl arrangement Referring to the drawing more in detail, there is shown in-Figure l a double acting press ram IIJ which is reciprocably mounted in a cylinder I 2. A pump vI-l of`v reversible delivery has one port connected through a conduit I6 with the upper end of .cylinder vl2 and' in the said conduit is a check .valve .I8 opening away from the pump. The .other side ofthe pump .has connected therewith a conduit 20 `which leads toone port' of a valve 22 which also has'a port-24 connected with the lower end ofthe cylinder l2, and a port 26 connected withtheport 28`of a, similar valve 3U.

The valve 22 has therein a valve member^32 Which is normally urged by a spring 34 into position toconnect the port 24 with the conduit 20 and to disconnect the port24 `from the port26.

The valve 30 is similar to the valve 22 and includes a port 36 which is connected with the discharge port of the fluid pressure intensier 38, and a port 48 which is connected with the conduit I6 between the check valve I8 and the upper end of the cylinder I2. The valve 30 also has a valve member 42 which is normally urged by a spring 44 into position to connect the ports 28 and 3B and disconnect the ports 36 and 40.

4The iiuid pressure intensier 36 has an inlet port which is connected by a conduit 4S with the port 48 of a valve 5B. The valve 50 also has a port 52 connected with the conduit I6 and a port 54 connected with the conduit 20. A valve member B in the valve 58 is movable by pressure in either of the ports 52, 54 into position to connect the said port with the port 48.

As mentioned before the fluid pressure intensier 38 has a valve member which must be driven in order to make the said intensiiier effective. This valve member has a shaft 58 to which is connected the gear motor 60. The gear motor EU has one port connected by a conduit 92 through a check valve 64 with the conduit I6, the said check valve opening toward the conduit I6. The other port of the gear motor 60 is similarly connected through a conduit 6G and a check valve 68 with the conduit 29.

Bypassing the check valve 64 is a normally closed valve "IIJ having therein the valve member 'I2 which is movable by fluid pressure conducted thereto from the discharge side of the check valve I8 by the conduit 'I4 to place the valve 'Il in its open position. In series with the valve 'Iil is a flow controlling valve I6 which is operable, as will be explained hereinafter to control the rate of uid flow therethrough.

The check valve 68 is similarly bypassed by the normally closed pressure responsive valve I8 and the flow controlling valve 8U in series therewith. The pressure responsive valve 78 is connected to be moved to its open position by pressure in the lower end of the cylinder I2 by the conduit 82.

The construction of the flow controlling valves I6 and 89 is best seen in Figure 3. Each of these valves comprise a valve member 84 which has the side port 86 in communication with the inlet port of the valve and a passage 88 communicating with the outlet port. In the discharge conduit of the valve there is an adjustable choke valve 99 and connected to the outlet of the valve 99 is a conduit 92 which leads to the spring chamber 94. The spring 95 urges the valve member 84 leftwardly into a position of minimum restriction of fluid flow through the valve. Movement of the valve member toward the right will set up a restriction to fluid now therethrough. It will be apparent that the valve member is urged rightwardly by the pressure standing in the channel 88 and leftwardly by the combined action of the spring 96 and the pressure in the chamber 94. In accordance with the setting of the valve 90 the liow control valve will thus permit iuid iiow therethrough at a predetermined rate which will create a pressure drop across the valve 9i) equal to the thrust of the spring 96.

In Figure 2 there is shown an arrangement similar to that shown in Figure 1 and which is similarly numbered with the addition of a subscript a except that the gear motor 60a has one port thereof continuously connected with exhaust by a conduit 98, while the other port of the said motor is connected through a now controlling valve IUI] with both of the discharge sides of the normally closed pressure responsive valves 'Illa and 18a.

By the arrangement shown in Figure 2 the` gear motor 69a is caused always to` rotate in the same direction and one of the now controlling valves shown in Figure l can be eliminated. The circuits of Figures 1 and 2 are otherwise identical in every respect.

Operation In operation, the press ram I0 is caused to advance downwardly by bringing about the delivery of the pump I4 to the conduit I6. After the press ram has engaged the work and a predetermined pressure is built up thereon the valve 'I0 is shifted open by pressure conducted thereto through the conduit 14. The supply of pressure iiuid now flows from the conduit I6 through the valve 18,' the valve 76 and the conduit 62 to the gear motor 60. This drives the gear motor in rotation and uid is exhausted from the other port thereof through the conduit 65, valve 68 and conduit 2U to the suction side of the pump I4.

The valve member 56 of the valve 5Il was previously shifted downwardly by the pressure in conduit I6 so that the inlet of the intensier 38 is connected to receive fluid from the conduit IIS.y Similarly, the pressure in the conduit I6 had previously moved the valve member 42 of the valve 39 downwardly so that the discharge from the pressure intensier is connected directly with the upper end of the cylinder I2. Under these conditions the intensifier delivers high pressure Huid to the upper end of the cylinder I2 and the ram advances further into the work.

It will be noted that the check valve I8 prevents the high pressure uid from being conveyed backf to the discharge side of the pump I4, and that the valve 'I0 remains open because its pilot conduit 14 is connected to the high pressure side of check valve I8.

Upon completing the work to be done by the ram I2, the pump I4 is reversed so that it delivers,

into the conduit 20. The fluid lowr,` through conduit 20 and valve 22 to the lower end of the' cylinder I2 and moves the ram I0 upwardly. At

this time the surge valve |02 opens by pressure conducted thereto by the conduit |04 and ex,

hausts the upper end of the cylinder I2 to the reservoir |06.

The valve member 56 of the valve 50 will return to its Figure 1 position and the valve mem. ber 42 of the valve 3i! will also return to its Figure.-

1 position.

Should the ramY I0 encounter resistance dur= ing its `retracting movement the valve I8 will be piloted open by uid conducted thereto by con-i. du1t 82 and bring about a supply of actuatingy fluid to the gear motor 60. This will again make the iluid pressure intensier 38 effective and fluid'I will be delivered therefrom through the valve 30 to the port 26 of valve 22. valve member 32 downwardly to interconnect ports 26 and 24 to direct the discharge from the; intensifier to the lower end of the cylinder IIl.`

Should the resistance to upward movement of the ram I 8 diminish, then the valve '18 will againA close making the intensifier 38 ineffective thuspermitting movement upwardly of the valve member 32 and again interconnecting the contherefrom will always pass through the ow controlling valve IUD and drive the motor 60a in the same direction.

This will move the It will be apparent that the circuit of this invention provides a means whereby the fluid pressure intensifier is made selectively elective or ineiective and in response to pressure conditions in the supplied circuit. Furthermore, the operation of the intensifier is brought about by a nuid motor which derives its motive power from pressure fluid taken from the supplied circuit.

It will be understood that this invention is susceptible to modication in order to adopt it to different usages and conditions and, accordingly, it is desired to comprehend such lmodifications within this invention as may fall within the scope of the appended claims.

We claim:

1. In a hydraulic circuit; a pump; a fluid pressure intensifier connected to receive the discharge of said pump and having a rotary valve member which must be driven in order to make the intensier effective; a iiuid motor drivingly connected with the valve member of said intensiiier; a normally closed valve connecting said motor with said pump; and means responsive to a predetermined discharge pressure of said pump for opening said valve thereby t-o drive said motor and to make said intensifier effective.

2. In a hydraulic circuit; a pump; a fluid pressure intensifier connected to receive the discharge of said pump and to increase the pressure thereof; a valve member in said intensifier which must be driven in order to make the said intensilier elective; a uid operable motor connected to drive said member; means responsive to a predetermined discharge pressure of said pump to bring about a supply of actuating fluid to said motor; and means connected with said motor for controlling the speed of operation thereof.

3. In a hydraulic circuit; a pump; a fluid pressure intensifier connected to receive the discharge of said pump and to increase the pressure thereof; a valve member in said intensifier which must be driven in order to make the said intensifier effective; a fluid operable motor connected to drive said member; means responsive to a predetermined discharge pressure of said pump to bring about a supply of actuating iiuid to said motor; and means connected with said motor for controlling the speed of operation thereof, said last mentioned means including ow controlling means connected in circuit with said motor and operable to determine the rate of fluid ow therethrough.

4. In combination; a` reversible delivery source of pressure iiuid; an intensier having an inlet and an outlet; automatically operable means for connecting said inlet with the discharge side of said source; said intensifier including a valve member which must be driven to make said intensifier effective; a fluid motor drivingly connected with said valve member and connected in parallel with said source; normally closed valves connected between each side of said source to said motor; and means responsive to a predetermined pressure at either side of said source for actuating the valve connected between that side and said motor into open position.

5. In combination; a reversible delivery pump; an intensifier having a low pressure inlet and a high pressure outlet; valve means responsive to pressure at either side of said pump for connecting that side with said inlet; a valve member for said intensifier which must be driven to make said intensifier effective; a fluid motor drivingly connected with said member and being hydraulically connected in parallel with said pump; means permitting free flow of fluid from either side of said motor toward said pump but preventing now in the opposite direction; normally closed valves bypassing said last mentioned means; and pressure responsive means associated with each of said normally closed valves and hydraulically connected with the same side of the pump and operable in response to a predetermined pressure therein to move the said valve into its open position.

6. In combination; a reversible delivery pump; an intensifier having an inlet and an outlet; valve means operable automatically to connect the discharge side of said pump with said inlet; a valve member in said intensier which must be driven to make said intensifier effective; a iiuid motor connected to drive said member and being connected in parallel with said pump; a check valve in each of the connections between said pump and motor and opening toward the former; normally closed valve means bypassing each of said check valves; pressure responsive means for each of said normally closed valves responsive to a predetermined pressure at the pump side thereof for moving the associated valve into open position; and speed controlling means for said motor operable to control the speed thereof during the supply of fluid thereto from either side of said pump.

'7. In combination; a reversible delivery pump; a liuid motor; check valves connecting said motor and pump in parallel and opening toward the said pump; normally closed valves bypassing said check valves and operable automatically in response to a predetermined pressure at the pump side thereof for opening to permit fluid flow to said motor; and speed control means operable to predetermine the rate of speed at which the said motor operates.

8. In a hydraulic circuit; a fluid displacement pump; a fluid pressure intensier having an inlet connected to receive fluid from said pump, an outlet, and a rotary valve member, said intensifier being operable upon rotation of the Valve member to receive liuid under a given pressure at the inlet thereof and redischarge at least a portion of such iiuid from the outlet at increased pressures; a fluid-actuated motor connected to rotate the valve member of said intensifier; and means connected between said fluid motor and said pump and responsive to a predetermined discharge pressure of said pump for supplyingl Number Name Date 1,451,303 Mitchell Apr. 10, 1923 1,600,384 Aikman Sept. 21, 1926 2,231,307 Wallace Feb. 11, 1941 2,279,364 Cadbury Apr. 14, 1942 2,340,929 Cadbury Feb. 8, 1944 2,366,388 Crosby Jan. 2, 1945 2,486,079 Tucker Oct. 25, 1949

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