US2463003A - Base for self-contained hydraulic motors - Google Patents

Description

March I, 1949. s c 2,463,003

BASE FOR SELF-CONTAINED HYDRAULIC MOTORS Filed May 14, 1945 r Patented Mar. 1, 1949 UNITED STATES BASE FOR SELF-CONTAINED HYDRAULIC MOTORS Thomas F. Stacy, Piqua, Ohio, assignor to The French Oil Mill Machinery Company, Piqua,

Ohio

Application May 14, 1945, Serial No. 593,630

4 Claims.

This invention relates to hydraulic motors and more particularly to the type popularly known as the self-contained motors, where the hydraulic motor, pump, valves and hydraulic system are all assembled in a device that may be handled as a complete unit. Heretoiore hydraulic motors of this type utilized as molding presses have had the cylinder with the advancing and retracting chambers, through pressure differentials in which the ram is operated, disposed with all of the valves, pump and piping in the reservoir that formed the base of the unit or press, so that any leakage in the system was directly into the reservoir where it did no harm. The major part of the adjustments and maintenance work required on these presses was in connection with the valves, and when servicing of the valves, piping or pump was required, it was necessary to empty the reservoir of the oil. A workman doing the servicing was not only handicapped by the film of oil that remained on the exterior of all the parts being serviced, but there was substantial danger that the workman would get dirt and other foreign matter into the oil or residue of the oil remaining in the reservoir, which, if taken up in the system and carried to different parts of the apparatus, might cause scoring of relatively moving, interfitting parts or other damage.

An object of this invention is to provide an improved, self-contained, hydraulic motor or press in which any or all of the control valves, pump and connections may be disposed exteriorly of the reservoir and normally concealed within the housing forming the base where leakage may be collected; with which all of such concealed parts will be readily available for servicing and inspection without the servicing mechanic being usually smeared with oil, and with a minimum danger of dirt or foreign matter getting into the operating fluid of the system; with which it will not be necessary to empty the reservoir of the operating oil when the servicing of such control valves, piping or connections and pump becomes necessary; with which leakage may be collected and filtered before being returned to the system, and which will be relatively simple, compact and inexpensive.

Other objects and advantages will be apparent from the following description of anembodiment of the invention, and the novel features will be particularly pointed out hereinafter in connection with the appended claims.

In the accompanying drawings:

Fig. 1 is a perspective of a self-contained molding press constructed in accordance with, and representing one embodiment of the invention;

Fig. 2 is a sectional plan of the same;

Fig. 3 is a similar sectional plan, of another embodiment of the invention, with the pump disposed outside of the housing; and

Fig. 4 is a section plan of another embodiment of the invention.

In the embodiment of the invention illustrated in Figs. 1 and 2, the self-contained hydraulic motor is incorporated in a hydraulic molding press of the type disclosed in my prior Patent #2358353, granted Sept. 19, 1944. In that patent the pump and all of the valves are disposed in the hollow base which acts as the reservoir. In the present invention the press includes a hollow base or housing I!) which is liquid-tight on its side and bottom walls and which has, extending upwardly through its top wall, a hydraulic ram l l surrounded by a packing gland i 2 where it emerges from the base Ill. The upper end of the ram II is connected to and operates a platen l3 which is guided, by vertical strain rods I l, toward and from a head l5.

Within the housing l0, and connected to the packing gland I2, is a hydraulic cylinder l6, Fig. 2, having a pilot operated prefill valve I! which opens into the space surrounding the cylinder l6. Secured to one side of the cylinder 16 is a valve plate I8, which is removably coupled to the cylinder I6 and also removably coupled by screws lfi to an internal flange 20 provided on the side and bottom walls of the housing II]. A gasket 2! is disposed between the valve plate l8 and the flange 29 to make a liquid-tight connection between them. This valve plate I8, with the flange 29, thus provides a partition or wall across the interior space of the housing I0, and divides it into two non-communicating compartments 22 and 23, in one of which is disposed the cylinder l6 with its prefill valve, and in the other of which the control valves 25 are disposed, and if desired also the pump 24. The control valves 25 are preferably mounted on the valve plate l8, and the pump 24, either within or exteriorly of the housmg.

An electric motor 26 is coupled to the outside of a wall of housing I8, and its armature shaft is coupled to and directly drives the pump. The pump is connected by suitable piping 2! to the valves and the advancing and retracting chambers of the cylinder E6 to form a hydraulic operating system ofany suitable type, one of which is illustrated in Fig. 1 of my prior Patent #2,358,353, to which reference may be had for a detailed illustration description of one type of hydraulic system that may be employed.

The housing It is provided at its top with a removable closure 28, see Fig. 1, through which access may be had to the compartment 23 through the top thereof, and is also provided with removable plates 29 on the opposite side walls, so that access may be had to the compartment 23 through these openings in the sides and top of the housing. The operating oil is all contained in the system and in the compartment 22. Any leakage through age has collected in the bottom of this c'ompart ment 23, it may be removed through a suitable drain valve, not shown, filtered if necessary :to remove foreign matter, and returned to zthe=reservoir compartment 22. When servicing of the hydraulic system is required, access :to the control valves, pipes and pump may be easily had through the openings in the top and side walls of the housing It), and the workman will not have to handle :parts covered with films of adheringoil as in previous instances. The danger of foreign matter being introduced into the oil by the workman is also reduced to a minimum, if not entirely eliminated.

In the embodiment of the invention illustrated 13, the arrangement is generally similar to that shown in'Fig. ;2, and corresponding parts are iven the same reference characters, the difference being that in the example shown in Fig. 3, the pump is disposed exteriorly of the housing it, but mounted on the end wall with the motor, a d connected bypipes extending throughthe end Wall t the valves and cylinder chambers.

the embodiment of the invention illustrated in Fig. 4, the housing .01 base I 0 is extendedhorizpntallyin the opposite direction from the cylinder l6 so as to provide asecond compartment 30. Apartitionplatefil isdisposed across the interior of the housing l0 and detachably coupled to an 3 internal flange 32, which .extendsalong the sides and bottom .of the-interior of the housing l 0, with a. gasket interposed "between the plate 3t and the flange 132,,so .as to prevent leakage of oil from the reservoir chamber surrounding the cylinder it into the chamber 30. The housing ll) may have removable plates 33 secured across and closing windows 34in one or more side walls of the housing 1 0, so as to provide ample access to the chamber, and the top wall of the housing may, if desired, also have a removable top plate, notshown, similar to the removable top 28 at the opposite end of the housing H1.

The pump 24' may be disposed in the chamber 30 and driven by the motor 2-6 mounted on the s exterior of the end wall of the housing ll! adjacent =the--pump. Thus the pump will be disposed in a separate chamber to which access may be had for servicing through the removal of plates on the sides and top of that end of the housing.

In the chamber 23 at the opposite end of the housing, the valves 25 m y be disposed, as in the other embodiments of the invention. With this rrangement, m re convenient a ess ay be had o th alves in the chambe s 2, wit out int ierenc .i om he p mnam simila ly more couven en acces ma b h d t t pum in t s pa ate ompartment.-

1 have round tha the adjustments and ost o the ntenance work in. these sell-contained mold ng p ess s c nnect on wi the a ves, and. n all of the embodim s of the. invention. he valves ar isolated in a chamber separate from the res rvoi s at hen servi ing on the val e i required. tis n ec s ry t emo e nd store the. operating iquid. and the danger o setting out or forei n matter. into the oil while working on or seryicing the valves is largely eliminated. The time requiredto service such a press is thus greatly reduced. The pump may be-left in the reservoir, if desired, because servicing of the pump is relatively infrequent in comparison with the frequency of servicing required for the valves. By removing the pump from the reservoir, servicing of the pump, when required, is more easily made, and inasmuch as there is little leakage from the pump, the pump can, if desired, be removed entirely from the housing [I] and mounted on the top or any of the sidewalls of the housing It.

It will be understood that various changes in the details, materials, and arrangements of parts, which have been herein described and illustrated in order to explain the nature of the invention, may be made by those skilled in the art within the principle and scope of the invention, as expressed in the appended claims.

I claim:

1. In a self-contained, hydraulic motor of the type having a reservoir, 2. pump, a cylinder having a prefill valve and advancing and retracting chambers disposed within said reservoir, a ram operated by pressure diiferentials in said chambers, a plurality of control valves, and connections between the valves, pump, reservoir and chambers and forming an operating hydraulic system by which the movements of said ram are controlled, that improvement which comprises an upright, separate plate Within said reservoir, coupled to the side and bottom walls thereof and to a side of said cylinder, forming a liquidtight partition across the interior of said reservoir at one sde of said cylinder, and dividing the reservoir into two horizontally side by side, non-communicating compartments, with said cylinder and its prefill valve in one of said compartments and serving as the reservoir and into which said prefill .valve opens, and said control valves in the other of said compartments where they will be free of external oil and exposed for easy servicing.

2. In a self contained, hydraulic motor of the type having in its base a reservoir, a pump, a

cylinder having a prefill valve and advancing and retracting chambers disposed in said reservoir, a ram operated by pressure differentials in said chambers, a plurality of control valves, and connections between the valves, pump, reservoir and chambers and forming an operating hydraulic system by which the movements of said ram are controlled, that improvement which comprises an upright, separate, added, partition wall across the interior of said reservoir at one side of said cylinder coupled and sealed to the side and'bottom walls of said reservoir, and dividing said interior into two non-communicating, horizontally, side by side compartments, one of which contains said cylinder and its prefill valve and serves as said reservoir, and the other contains said control valves and said pump, whereby said control valves and pump will be outside of said compartment carrying operating oil and exposed for easier servicing without emptying of the reservoir compartment, and contamination of the oil by servicing operations will be reduced.

'3. In a self-contained, hydraulic motor of the type having a base with a chamber serving as a reservoir, a pump, a cylinder having a prefill valve and advancing and retracting chambers disposed in said reservoir, a ram operated by pressure differentials in said chambers, a plurality of control valves, and connections between the valves, pump,1reservoir and chambers and forming an operating hydraulic system by which the movements of said ram are controlled, thatimprovement which comprises an upright, separate additional partition wall inserted in and extending across the interior of said reservoir at one side of said cylinder, coupled and sealed to the side and bottom walls of the reservoir and dividing said interior into two non-communicating, horizontally, side by side compartments, one of which contains said cylinder and serves as said reservoir, and the other contains said control valves, and said base having openings in its walls leading directly to said other compartment and removable closures for said openings, whereby said control valves will be outside of said compartment carrying operating oil and exposed for easier servicing Without emptying of the reservoir compartment, and contamination of the oil by servicing operations will be reduced.

4. In a self-contained hydraulic motor of the type having in its base a reservoir housing, a cylinder with advancing and retracting chambers and a prefill valve disposed in said housing, a ram operated by pressure difierentials in said chambers extending out of said housing, a pump, a valve plate secured to the side of said cylinder, a plurality of control valves mounted on said plate, and connections between the valves, pump, reservoir and chambers, and forming an operating hydraulic system by which the movements of said ram are controlled, that improvement which comprises said valve plate engaging and sealed to the side and bottom walls of the housing and dividing the interior of said housing into two non-communicating compartments, with said cylinder and its prefill valve in one of said compartments, and said control valves in the other of said compartments, whereby said control valves will be unsubmerged in oil and exposed for easier servicing without emptying of the reservoir compartments surrounding the cylinder, and contamination of the oil by servicing operations will be reduced.

THOMAS F. STACY.

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

UNITED STATES PATENTS

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