US2347368A - Control means for hydraulic motors - Google Patents

Description

A E-i2 25, 194 3-9 Q. E. RFQSEN 2,3423% CONTROL'MEANS' FOR HYDRAULIC MOTORS I.

Filed Jan. 26, 1942 5 Sheets-Sheet 1 IN VEN TOR.

ATTORNEYS April 25,3944. Q RQSEN I 2,3423% CONTROL MEANS FOR HYDRAULIC MOTORS Filed Jan. 26, 1942 s Sheets-Sheet 2 v ENTOR 6,5 861- 1 Z. OJQL ATToRNE' YS April 25, 1944. I Q ROSEN 2,347,368

- CONTROL MEAN$ FOR HYDRAULIC MOTORS Filed Jan. 26,1942 :s Sheets-Sheet 3 INVENTOR. QcnJr k J jg ATTOR NE Y8 Patented Apr. 25, 1944 CONTROL MEAN 8 FOR HYDRAULIC MOTORS Oscar E. Rosen, Detroit, Mich. Application January as, 1942, Serial No. 428,250

(or. sea-e) 5 claims.

hie present invention relates to control means for hydraulic motors and specifically to a single control means for a plurality of such motors.

Among the objects of the invention is a single control means for a plurality of motors whereby, of two motors, either may be operated by itseif or both operated simultaneously, or either may be operated forward while the other operates simultaneously in reverse.

Another object is a control for a pair of motors; adapted to produce motion in directions at right angles to each other, whereby the resulting motion may be in either direction or a composite and therefore diagonal direction.

Still another object is a control of the type indicated which may be operated by means of a single universally mounted lever-the amount and direction of movement being. indicated and determined by the movement of said lever.

Other objects and advantages will be apparant to those skilled in the art upon reference to the following description and the accompanying drawings in which Figure 1 is a diagrammatic view showing the control device and its installation with a pair of motors.

-Figure 2 is a partial vertical sectional view ure 3.

Figure 3 is a partial horizontal sectional view on line 3-3 of Figure 2.

Figure 4 is a section on line 4-4 of Figure 2. In the drawings, the control device, shown in detail in Figures 2 m4, is indicated at a and is shown as being supplied with suitable fluid through conduits b and c by pumps d and e from tank I. Each of the conduits b and c supplies two opposed cylinders of the control device a. the conduit b leading to cylinders 20A and 293, while the conduit supplies cylinders 20C and 26D.

From the cylinders 20A and 203 the conduits g and it lead to the two ends of a motor 5!, this being shown as of the cylinder and piston type, though any other reversible hydraulic motor could be used. From the cylinders 20C and 20D the conduits la and I lead to a second motor m and from the central housing portion of control A, the outlet conduit 0 leads back to tank 1. The control valve shown in detail in Figures 2, 3 and 4 comprises a central housing 20 having extendingfrom its upper portion, radially and equally spaced, four cylinders 20A, 20B, 20C, and

20D, which with their liners, valves, etc. are substantially identical.

21 with groove 24.

Each cylinder is closed at its outer end with a suitable plate 2! and provided with a liner 22 which is peripherally grooved on the outside at 23 and" 29'. The liner is also provided with internal peripheral grooves 25 and 26, the latter (25) communicating through suitable passages Groove 23, through passages 22, also communicates with the interior of the liner at a location between grooves 25 and 25.

The peripheral grooves 23 and 2A connect with suitable ports on the outside of the cylinder, groove 23 being the inlet groove and groove 24 being the outlet groove. On cylinder 20B,

, the two ports 23A and 24A are respectively inlet through the control device on line 2-2 of Figand outlet ports.

Coacting with and slidably mounted in each liner 22 is a valve member 80. This consists of an axially bored cylindrical member provided with outer peripheral grooves Si, 32 and 33, grooves 3i and 33 communicating through passages BIA and 53A, with the axial bore 30A of the valve and located near the ends of the latter. Groove 32 is between the other two.

At its inner end, the valve 30 is cross-slotted to provide ears 30B and open the end of the bore 89A. These ears 883 also provide for three of the valves, 8. connection for a link 36 pivoted therebetween on a suitable pin 85.

Within the housing as, the several links 35 are pivoted to a centrally located valve actuating element 40, by means of pins 4i while/the fourth valve is pivoted directly thereto as at 42 with out an intervening link.

vided on its upper face with a shoulder upon which is seated an annular plate 43 serving to prevent dislocation of the several pins 35, 4|, and B2 and itself prevented from dislocation bythe pin 44 passing through the central boss 45.

Seated in the upper end 01' boss 65 is a hardened ball 46 and directly above the latter a spring pressed plunger I! mounted in the cover plate 48. plunger 41 is provided with a conical seat 4' for theball 4B.

The lower face of element 40 is provided with a ratherdeep cut or recess 40A adapted to receive the outer race of an anti-friction bearing at substantially the level of the links 34, and

pressed into the inner race tLereof is the upper a reduced end 56A of a short shaft 56 of a gear 51 which, with a gear 55 and the housing 59.

The gear pump and housing 59 are mounted upon the suitably flanged (as at upper end of a lever 'Il provided with a spherical enlargement l2, and a passage 62 leads diagonally from chamber 6| to a central chamber 63, within the spherical enlargement 12, having horizontally arranged radial passages 64 leading to the outside.

The lever H is held in place by a suitable cap member 13 fixed to the bottom of housing 20 and packed with the packing shown in Figure 2.

This packing consists of metallic ring 14, grooved around its inner periphery as at E5 and with a radial opening 16, sandwiched between two non-metallic packing rings ll.

Registering with the opening 16 in ring I4 is a passage 18 leading through a portion of cap 13 and a wall of housing 20 to an outlet 19.

An important element of this construction is indicated in Figures 2 and 3 by the two lines appearing in the inner race of bearing. These two lines indicate the center lines of the shaft 56 and of the reduced extension 58A and show that the latter is arranged slightly eccentric to the former and due to this eccentricity the rotation of the shaft 58- produces a constant small endwise oscillation of all of the valves and thereby insures smooth, quick and accurate response by the motors to movements of the lever 'l I.

In the operation of the control, the pumps d and e are first put into operation and liquid is forced into the several cylinders through the openings 23A to the grooves 23 from which it passes through passages 28 t-n-grooves 32 in the valves 30.

With the valves 30 in the position shown (Fig. 3), liquid flow is then into the grooves 25, through to the valve grooves 33, passages 33A- and bore 30A to the central housing 20. In use, this central housing 20 is filled with liquid 'and the flow is continuous through the gear motor 51-58, flowing in through inlet 80 and out through the chamber SI and passages 62, ,53, and 64 to ring from which through passage 18 to outlet l9 and conduit 0 back to tank I. This causes continuous operation of motor 51-58.-

With the valves in the position shown and the fluid flow as just described, there is no action on either of the motors :i and m, and since fluid can flow neither in nor out, the motors are locked against movement. When, however, a valve 30, for example in cylinder A, is moved inward, the groove 32 moves away from groove 28 and opens into groove 26 so the entering liquid flows thereinto and then through passage 27 to groove which opens to its portilA and is, through conduit g connected to one end of motor i. At

the same time, the valve 30 in cylinder "8 has beenmoved outward an equal distance and its groove 3! has been moved to open to its groove 21, so that liquid fromthe other end of motor a flows through conduit 11. back through port A to its groove 24 and then through passage 21, groove 3| and passage IIA to the bore 30A and to the housing 20.

Movement of'the valves "in cylinders 20A and 20B in the opposite direction will of course supply and exhaust liquid from motor 1 in the reverse direction. Likewise, movement of the valves 30 in cylinders 20C and "D will cause the actuation of motor 112. in one or the other direction, while a diagonal movement of the anlve. sally mounted lever 1| will of course move all of the valves with corresponding actuation of both motors i and m. I

Now having described the invention and the preferred embodiment thereof, it is to be understood that the invention may be embodied in other specific forms without departing from the spirit or. essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive; reference being had to the appended claims rather than to the foregoing description 10 toindicate the scope of the invention.

I claim:

i. In a unit control for a pair of fluid actuable reversible motors, having a source of fluid supply and separate means for drawing fluid therefrom l5 and forcing it under pressure through each of said motors andreturning it to said source, a plu-' rality of valves for controlling the operation and direction of operation of said motors, and means for oscillating said valves during operation of said 20 forcing means.

2, In a unit control for a pair of fluid actuable reversible motors, having a source of fluid supply and means for'drawing fluid therefrom and forcing it under pressure through said motors and returning it to said source, a plurality of valves each adapted to direct fluid to one-side of a motor or to permit fluid to exhaust back to said source, a common operating means for said valves and a motor connected to said common operating means and adapted to oscillate all of said valves during the operation of said fluid drawing and forcing means.

3. Ina control unit for a reversible fluid actuable. motor, having a source of fluid and means 35 forforcing fluid under pressure to and through said motor and back to said motor and'back to said source, a pair of valve casings, conduit means leading from said forcing means to each of said casings, conduit'means leading from each of said 40 casingsto one side of said motor, an outlet conduit from said casings leading 'to said source, valves simultaneously movable from a neutral position to either one of two motor operating positions, in either one of which fluid is directed to one side of said motor while fluid is allowed to exhaust from the other side of said motor, while in neutral position fluid is led directly to said outlet conduit from both valves, means for imparting a vibratory motion to said valves, and means for actuating said valves to or from one of said positions.

4.In a valve unit a plurality-of valves for controlling the flow of fluid to and from a hydraulic motor, means for leading fluid to said motor 5; through said unit, means for leading fluid from said motor through said unit and exhausting same, and a fluid motor located within said unit and operable by exhausting fluid, said latter motor being connected in driving relationto said valves whereby to cause oscillation thereof.

5. In a valve unit a plurality of valves for controlling the flow of fluidto and from a hydraulic motor, means for leading fluid to said motor through said unit, means for leading fluid from said motor through said unit and exhausting same, a valve operating lever projecting from said unit, a fluid motor located within said unit and carried by said lever and operable by exhausting.

7o fluid, said latter motor being connected in driving relation to said valves whereby to cause oscillation thereof, and fluid outlet means from the lat ter motor extending through a portion of said a y OSCAR EROSEN'.

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