US1740714A - Fluid-pressure motor - Google Patents

Description

1929. T. R. E. RUNDQVIST 1,740,714

' f FLUID PRESSURE MOTOR Filed Dec. 20, 1923 Patented Dec. 24, 1929 mnonn R.

- i t FLUID-PRESSURE MOTOR I Ap licant filed necemb eraa 1923. Serial No. 681,848.;

invention relates to pressure fluid motors h An object ofmy inventlon s to provide an improved'pressurefluid motor. Another object of myinvention lS tf) provlde 4 an 1111- proved motor in wh ch extreme rapldity of reciprocation may be obtamed. St1llanother objecto'f my invention 1s to provide an improvedmotor of thepressure flu d percussive type especially adaptedfor rock drilling purposes in whichby reason of ncreasedspeed and power otremprocatmn, thespee'd of drilling ismater ally increased. A still further object of myv nvent on is to provide an improved valve mechanism tor motors and especially adapted for rock I drilling motors of the percussive type. "Ihes'e and otherobj ects and'advantages of my invent on will, however, hereinafter more iully appear.

In the accompanying drawings I have shown for ur oses ofillustra'tion one form which my'inv'ention may assume in PI'ZLCtlCG. In these drawings,- 'Fig."1 3 is a central 'long'1tud1nal vertical sectional view through a drilllng motor 1n which an 1 illustrative form of my invention is'in'corporated', the view being partially in side elevation. I v V Fig. 2 is a'view' similar't'o that shownln Fig. 1 with parts assuming different pos tions; Fig. 3is a detailside elevatlonal'vlew, partially in section, of a portlon of my mproved mechanism: Fig. 4 is a transverse'sectional 'view'taken substantially on line 44 of F g. 3. a Fig, 5'is anendelevation view of one'of the bufterplugs.- Fig. 6is'adetail v ew-of the improved valve mechanism. 1 I 1' In this illustrativeform of myl'nvention', I have shown-a pressure-fluid percussive motor, generally designated-1,- comprising a cylinder-2 having a bore 3 1n-wh1ch plston 4: is reciprocable; The piston 4 1s provldedwith a'projecting striking-bar ,5 adapted to percussively actuate a I to? RUNDQV-IST, OF'GLAREMON'I, NEW'HAMPSHIRE, ASSIGNOR IO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MA$SACHUSETTS LMJM drill steel (not shown) suitably carried within theiront end of the motor in a well known manner. ,The, op-

posite ends of the cylinder by suitable head members 6 bore 2 are closed and 7, the former beingheld in the desired'assembled relation by means ofside rods (not shown) in the usual manner while the latter is forged integrjal with the cylinder 2.

Pressure fluid is I distributed alternately to the ends of the cylinder by means of distribution passages 8 and 9, the supply and exhaust of pressure fluid through these passages 8, 9

being controlled by a valve mechanism of improved construction, generally designated 10. Herein the valve mechanism comprises a casing orchestll in which suitable valvebushings'12 are so arranged as to form a valve chamber havingbores l3 and 1d of different diameters. These passages 8, 9 communicate with the valve chamber adjacent the ends of the enlarged central bore 14 terminating in annular grooves 15 and 16.

Adjacent the extremities of thesmaller bores 1i3, ports 17 and 18"connect throw or reverse passages 19 and 2Owith the valve chamber,

these passages at their opposite ends" communicating with the bore ofthe' cylinder spaced ports 21 andt22.

2 by longitudinally Intermediate the port l7 and'gr oove 15, and port 18 and groove 16,"respectively, in the valve chest there are formed annular grooves 23 and 12%, whioh grooves c'omm'unicate by ports 25 and 26 with an exhaust passage '27 member 28 suitably secured As illustrated, a valve, 29, is arranged within the is herein of the multiple sp prising recessed end spools the bores 13' and a central formed in a box-like tothe valve chest,

generally designated v j'ch t Whi 001 type and comor heads 30 fitting grooved spool, or

head 31fittingthe bore 14," the heads 30, 31 being connected by reduced portions 32 Herein, 1t Will be observed that the outer ends of the bores 13 are closed b 38 and34 with which the r y buffers or plugs ecessed ends 30 of the valve are adapted to engage and which are held in the desired assembled rigid relation by means of a bolt extending coaxially through the axis of the valve. These buffers 33, 34 are laterally grooved at 36 and 37, which grooves permit the ready supply and exhaust of fluid between the ends of the buffers and the valve. Herein, the pressure fluid supply communicates with an annular space 38 formed between the ends of the valve bushings 12 in the central part of the valve chest.

In my improved construction it Will'be noted that the bolt 35 is traversed by a plurality of radially extending longitudinally spaced ports 39 and '40 whichcommunicate by means of circumferentially extending grooves 41 and 42 with the bores 13 in the valve chamber at points adjacent the inner ends of the buffer plugs 33, 34. Ports 39 and also communicate by way of passages 43 and 44 arranged coaxially through the ends of the bolt, with the atmosphere. Herein, formed intermediate the grooves 41 and 42 are annular grooves 45 and 46 formed in the outer periphery of the bolt 35 which are provided with longitudinally extending slots or grooves 47 and 48 extending to a point adjacent the grooves 41 and 42. The buffer plugs 33 and 34 are radially slotted or grooved as at 33 (see Fig. 5-). Herein, it will further be noted that the reduced portions 32 of the valve 29 are traversed by a plurality of angularly disposed ports 49 and 50 which are alternately adapted to permit communication between the grooves 45,

' 46, slots 47, 48, slots 33 in the buffer, the valve chamber adjacent the inner ends of the buffers 33 and 34, and the reverse ports 19 and20.

In the operation of my improved mechanism it will be observed that when the valve assumes the position shown in Fig. 1, pressure fluid passes from the inlet space 38 to the left of the grooved central spool 31 of the valve and by way of passage-8 to the rear end of the piston 4 to cause forward movement thereof. Simultaneously the front end of the cylinder is connected by passage 9 with exhaust. The piston4will accordingly move forward and during its forward movement the rear edge of the piston head uncovers the reverse port 20 admitting live pressure 'fluid to the right hand end of the valve, reversing the same and the hammer piston as shown in Fig. 2, the passage 900mmunicating with the inlet pressure and the passage 8 with'exhaust. When the valve has assumed the position shown in 'Fig. 2, the pressure fluid acting on the right hand side of the grooved central spool 31 forces the valve in seated position against the buffer plug 33 and when in that position the live pressure .fluid is. admitted through the port 49 in the valve, annular grooves 45 in'the bolt, and slot 47 which registers with the slots 33' in the buffer plug, the fluid flowing through slots 33 to the chamber at the left hand end of the valve thereby causing a pres sure to build up in the reverse port and in the rear of this head of the valve substantially balancing the same. If, however, an excessive pressure builds up tending to overcome the pressure acting on the head 31, the valve will unseat slightly from the buffer thus opening communication with the grooves 41, ports 39, and opening 43 to exhaust reducing the pressure, again causingthe valve to seat and eliminating the consequent excessive fluttering of the valve and preadmission of pressure fluidto the cylinder bore.

These balanced pressures acting on the side of the head 31 and the rear of the head 30 and the preadmission of pressure fluid to may assume in practice, it will be understood that this form of the same is shown forv pur? poses of illustration and that theinvention may be modified and embodied in other forms without'departing from its spirit or the scope of the appended claims.

What I claim as-new and desire to secure by Letters Patent is: 1

1. In a pressure fluid motor, a cylinder, apiston reciprocable therein, means forming distribution passages leading to said cylinder, a valve controlling said passages, means forming throwing passagesforiad mitting live pressure fluid to the ends of said valve for throwing the latter,'and auxiliary means controlled by said valve for admitting live pressure fluid to one endof said valve prior to the admission of throwing pressure to said end. 7

2. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means. forming distribution passages leading to said cy'linder, a valve controlling said passages, means forming throwing passages for admitting live pressure fluidto theends of said valve'for throwing the'latter, auxiliary means controlled by said valve for admitting live pressure fluid to one end of said valve prior to the admission of throwing pressure to said end, and means controlled by said valvefor.

preventing premature throwing thereof.

3. In a'pressure fluid-motor, a cylinder, a piston reciprocable therein, 'meansPform-ing distributionpassages leading to said cylinder, avalve controlling said passages, means comprising throwing passages controlled by wbu said piston for admitting-live pressure'fluid from said cylinder tothe' ends of saidvalve for throwing thelat-ter, and auxiliary means controlled by said valve for admitting live pressure "fluid to one end "of said valve prior to the admission ofthrowing'pressure to said 4. In':a pressure 'fluid' motor, a cylinder, apiston reciprocable therein,'means forming distribution passages leading to s'aid cylinder, a valve controlling said passages, means forming throwing passages for's'aidvalve, auxiliary means for admitting live pressure fluid to one end of said valve substantially balancing the same prior to the throwing action thereon, and means controlled by said valve for preventing a premature throwing of the latter.

In a pressure fluid motor, a cylinder, a piston reciprocable therein, means forming distribution passages leading to said cylinder, a valve controlling said passages, means forming throwing passages for said valve, auxiliary means for admit-ting live pressure fluid to one end of said valve substantially balancing the same prior to the throwing action thereon, and means including vent passages controlled by said valve for preventing a premature throwing of the latter.

(5. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means forming distribution passages leading to said cylinder, a valve controlling said passages, means formng throwing passages for said valve, auxiliary means controlled by said valve for admitting live pressure fluid to one end of said valve substantially balancing the same previous to the throwing action thereon, and means controlled by said valve for preventing said auxiliary means from allowing a pressure to be built up great enough to throw said valve.

7. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means forming distribution passages leading to said cylinder, a valve controlling said passages, buffers limiting the movement of said valve, means for holding said buffers in assembled relation, and means disposed in said last mentioned means and controlled by said valve for admitting pressure fluid to an area on one end thereof previous to the throwing action on said area.

8. In a pressure fluid motor, a cylinder, a piston reciprocable therein, means forming distribution passages leading to said cylinder, a valve controlling said passages, means forming throwing passages for admitting live pressure fluid to opposed areas on said valve for throwing the same, buffers limiting the movement of said valve, means for holding said buffers in assembled relation, and means disposed in said last mentioned means and controlled by said valve for admitting pressure fluid to one end thereof substantially ,mission of'throwing pressure to said-end.

9. Ina pressurefluid motor, a cylinder, a

piston reciprocable therein,-means forming distribution passages leading to said cylinder, a' valve controlling said passages, bufl'ers for limiting movement of said valve,"a bolt for guiding said valve and for maintaining said buffers in assembledrelation, said valve havopposed surfaces, meansfor alternately subjecting said surfaces to fluid pressure for throwing said va'lve, and means provided by said bolt for admitting'live pressure fluid alternately to said'surfaces to accelerate the throwing action-r 10. Ina pressure fluid motor, a cylinder, a piston "reciprocable therein, means forming distribution passages leading to said cylinder, a valve controlling said passages, butfers'for limiting movement of said valve, a center bolt for guiding said valve and for maintaining saidbufl'ers inassembled relation, saidvalve having op'posedsurfaces', means for alternately subjecting said surfaces to. fluid pressure for throwing said-valve, and means provided by said center bolt and controlled by said valve for admitting live pressure fluid alternately to said surfaces to accelerate the throwing action.-- i

"1 11 In a pressure fluid motor, a cylinder, a piston: reciprocable therein, means forming distribution passages-leading to said cylinder, a valve controlling saidpassageameans forming throwing passages for said valve, buffers for limiting movement of said valve, a center bolt for guidingsaid'valve and maintaining said buffers in assembled relation, and means provided by-saidcenter bolt and controlled bysaid valve for admitting live pressure fluid I to-one end'of the "latterprior to and for accelerating the throwing action, thereon.

"12. Ina pressure fluid motor, a cylinder, a piston reciprocable therein, meansforming distributionupassages leading to said cylinder,-

valve controlling said passages, means forming throwing passages-forv said valve, buffers for limiting movement of said valve, a center bolt for guiding said valve and maintaining said buffers in assembled relation, means provided by said center bolt and controlledby said valve for admitting live pressure fluidto one end of the latter prior to the throwing action=thereon,- and means for venting the-saidend of said valve for premature throwing-thereof. --13. Ina-pressure fluid motor, a cylinder, a piston reciprocable thereimineans forming distribution passages leading to said cylinder,

a valve controlling said'passages, means-for admittinglive pressure fluid to the, ends: of said valve for throwing the latter, buffers for {limiting move-mentof said-valve, a center bolt for guidingsaidvalve and maintaining said 'buflers in, assembled relation, means compreventing prising passages-formed .in said boltzfor ad- -mitting livespressureIfiuid to the ends of: said valve and. for .venting the ends of the latter, :and means including. passages formed in said valve foralternatelyopening and closing said .passages.

314;:In1a pressure fluid-motor, .a cylinder, a piston reciprocable. therein,: means forming adist'ribution passages leading to said cylinder, auvalve controlling said-passages, buffers forlimitingmovement of said valve, a bolt extending centrally throughsaid valvefor anaintaining said buffers .in assembled relation, -s'aid;va1ve-.;hav;ing opposed surfaces, :means :for alternately subjecting said :sur-

faces to fluid pressure for throwingsaid valve, anchmeans .providedrby said bolt for admitting live pressure fluid alternately to said surfaces to accelerate the throwing :ac- :tion.

- l5..:In:'a.pressure .fiuid motor, a cylinder, a piston reciprocable therein, means forming :distributionpassagesleading to said cylinder,;a valve controlling said passages,-buifers forlimiting movement of said valve, a center bolt extending centrally through said valve formaintainingsaid buffers in assembledzrel'ation, said valve having opposed surfaces,-.means for alternately subjecting said surfaces to fluid pressure forthrowing said valve, and means provided by said center bolt-and controlled by said valve foradmitting:live pressurefluid alternately-to said surfaces to accelerate the throwing action.

16. In a pressure fluidmotor, acylinder, a piston reciprocable therein, meansforming distribution .passages leading to said cylinder, a valve controlling said passages, means f'forming throwing passages for said valve, ibalfersfor-limiting movement of said valve, a center bolt extending centrallythrough said valve maintaining :said buffers in assembled relation, and means providedby said center "boltand controlledby said valve for admitting live pressureifiuid to one-end of the latter prior to .and for acceleratingthe throwing .action thereon.

1:7. Ina pressure fluid rmotor, a cylinder,

a piston reciprocable thereimmeans forming distribution passages leading to said cylinder, a valve controlling said passages,=means forming throwing passages for said valve, buffers for limiting movement-of said valve, -a-.center bolt extending centrallythrough said .v-alvemaintaining said buffers in assembled relation, means provided by said center bolt .and controlled by said valve for admitting live pressure fluid to one end of the latter prior "to the throwing action thereon, and means for venting-the said endofsaid valve for preventing premature throwing thereof.

- 18. In a press ure'fluid 'motor, a cylinder, a' piston reciprocable therein, means forming distribution passages leading to said cylinde1',-a valv e controlling said passages, means of said -valve :for thrldwing ;.the ilatter, buffers for 'limiting'movfement .offssaid valve, .aicenter bolt extending centrally through said valve maintaining; saidgbuffersin assembled :relaition, .means comprising *passages Jformed :in

said bolt for admitting live pressure fiuitlzito theends of said valve and for ventingithe ends of the latter and means includingcpassages formed in said :valve ;;=f or alternately opening and closing said passages.

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