US3533251A - Brake actuator for hydraulic transmission - Google Patents

Brake actuator for hydraulic transmission Download PDF

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Publication number
US3533251A
US3533251A US772299A US3533251DA US3533251A US 3533251 A US3533251 A US 3533251A US 772299 A US772299 A US 772299A US 3533251D A US3533251D A US 3533251DA US 3533251 A US3533251 A US 3533251A
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United States
Prior art keywords
pump
valve
port
conduit
brake
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Expired - Lifetime
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US772299A
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English (en)
Inventor
Howard C Wiemer
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Borg Warner Corp
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Borg Warner Corp
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Publication date
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/30—Driving arrangements 
    • D06F37/308—Hydraulic or pneumatic speed control; Arrangements or adaptations of hydraulic or pneumatic motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S60/00—Power plants
    • Y10S60/908—Washing machine system

Definitions

  • the piston including a land responsive to fluid pressure during the agitate cycle to augment the force of the spring to hold the clothes basket stationary during the agitate cycle and a second land responsive to fluid pressure during the spin cycle to move the piston in a direction to release the brake mechanism to free the clothes basket for rotation.
  • This invention relates to hydraulic transmission mechnisms and more particularly to hydraulic transmission mechanisms for washing machines which include a brake mechanism for stopping rotation of the clothes basket of the washing machine.
  • Previously known hydraulic transmissions incorporating brake mechanisms for Washing machine installations as, for example, copending application Ser. No. 671,675, filed Sept. 9, 1967, now Pat. No. 3,443,405, of common assignee, include an actuator for the brake mechanism which is released by fluid pressure during the spin cycle to allow spinning of the clothes basket and urged into an engaging fposition by a spring at the completion of the spin cycle to stop rotation of the clothes basket.
  • a separate positive lock mechanism which may -be hydraulically actuated is usually provided, for example, a hydraulically actuated pin mechanism to hold the clothes basket stationary during the agitate cycle.
  • the present invention provides an improved brake actuator which utilizes a land responsive to fluid pressure during the agitate cycle to augment the force of the spring to apply the brake mechanism with increased force and thereby hold the clothes basket stationary.
  • the present invention eliminates the need for a positive lock mechanism on the clothes basket and conveniently utilizes available hydraulic pressure to insure that the clothes basket will not move during the agitate cycle.
  • FIG. 1 is a schematic view of a control system for a hydraulic transmission for a clothes washer embodying the principles of the invention
  • FIG. 2 is a view taken along the lines 2-2'of FIG. 1;
  • FIG. 3 is a view taken along the lines 3-3 of FIG. 1;
  • FIG. 4 is a cross-sectional view of the transmission in actual washing machine installation.
  • a washing machine is schematically illustrated comprising a tub adapted to hold a laundering uid, a clothes container 11 and an oscillatable agita- 'United States Patent O 3,533,251 Patented Oct. 13, 1970 ice tor 12.
  • a hydraulic transmission 14 is schematically illustrated for independently driving the clothes basket 11 for effecting a centrifugal drying operation, herein referred to as the spin cycle, or the oscillatory agitator 12, herein referred to as the agitate cycle, of the automatic clothes washer.
  • the transmission 14 includes a transmission inner housing generally designated as 15 within which most of the elements of the transmission are mounted.
  • An electric motor 16 is provided having a water pump 17 driven thereby for recirculating Water in the clothes container 11 of the automatic washer and a source of power 18 is illustrated for operating the motor 16.
  • a cycle selector switch 19 is schematically illustrated in simplified form although in a washer installation this function would bey performed by a timer switch mechanism of known construction.
  • the important elements of the hydraulic transmission are as follows: a constant volume reversible uid pump 21, an oscillatory agitator motor 22, a rotary control valve 23 for the agitator motor, a by-pass/relief valve 24 for the agitator motor, rotary control valve 25 to selectively restrict the output of the pump 21 and a spin brake actuator 26.
  • a liuid sump 28 is provided which is schematically illustrated for convenience at various places in the illustration of the invention, although in the actual construction, one fluid sump 28 is provided into which all the exhaust connections for various elements of the transmission exhaust fluid pressure.
  • Electric leads 29 and 30 interconnect the source of power 18 with the motor 16, the lead 30 being a ground line.
  • Lead 31 connects the source of power 18 to switch mechanism 19.
  • Switch mechanism 19 is connected to the motor by a lead 32 or a lead 32a.
  • the hydraulic pump 21 includes a pumping element 35 and a rotatable pump housing element 36 operative within a xed case section 37.
  • hydraulic pump 21 Any of a number of well-known types of hydraulic pumps could adequately perform the functions of the hydraulic pump 21, as for example, the crescent type or the gerotor type, but for reasons that will later be described, it is found that the vane type pump will perform best in the present transmission.. For this reason, the hydraulic pump 21 is illustrated as a vane pump.
  • the pumping element 35 consists of a rotor 38 connectible to a rotatable drive member 39 of the electric motor 16.
  • the rotor 38 contains a series of radial slots 42.
  • a plurality of vanes 43 are provided, each vane adapted to slide within a slot 42..
  • the rotatable pump housing element 36 consists of an annular disc mounted eccentric to the rotor 38 and is shown drivingly connected to the clothes container 11.
  • a pair of arcuate ports 44 and 45 are formed in the pump housing element 36 for communicating fluid from the sump 28 to pump 21 and, after the fluid is pressurized, from the pump 21.
  • the ports 44 and 45 will either be inlet ports or exhaust ports depending upon the direction of rotation of the electric motor 16 and thereby the direction of rotation of the rotor 38.
  • a fluid conduit 47 is provided to communicate fluid operated in a direction so as to activate the spin circuit.
  • a check valve 48 allows fluid flow only in a direction from the sump 28 into pump 21.
  • Fluid conduit 49 is provided to communicate uid from sump 28 to port 44 when the electric motor 16 is operated in a direction to activate the agitate circuit.
  • Check valve 50 allows fluid ow only in a direction from the sump 28 into pump 21.
  • Check valves 48 and 50 ⁇ are spring biased open, the purpose of which will later be described.
  • the oscillatory agitator motor 22 includes a vane 52 mounted in a chamber 53 and has associated therewith a reversing valve 54.
  • the vane 52 drives a shaft 51 which in turn is drivingly connected to agitator 12.
  • a slot 56 Provided in 3 the vane 52 is a slot 56 which at times communicates with a pair of-ports 58, 59 and 60,-61 provided in the housingV adjacent the vane 52.
  • Chamber 53 is connected to reversing valve 54 by conduits ⁇ 64 and 65.
  • Reversing valve 54 is also connected to the ports 60 and 61 by conduits 68 and 69, respectively.
  • the spin rotary control valve and the agitator rotary control valve 23 each includes rotary valve spools 70 mounted in a bore 71 in a case section 72.
  • Each of the rotary control valves 23 and 25 further includes a lever 73 actuatable to rotate the valve spool 70.
  • Provided within the spool of the valves 23 and 25 is a central bore 75 which is intersected by generally rectangular slots 76 provided in the valve spool 70.
  • the control valves further each includes an inlet port 78 communicating with the bores 75 and an outlet port 79 communicating with the slots 76 and the sump 28.
  • Control valve 25 further includes an elongated bore section 80 connected to the bore 75 which has a relief piston 81 slidably mounted therein.
  • a spring 82 is provided in the bore section 80 urging piston 81 to the right against a stop pin 84.
  • Rotary valve spool 70 for valve 25 has an additional port y86 therein communicating with an exhaust port 87 provided in the case section 72.
  • the bypass/relief valve 24 includes a piston 90 slidable within a bore 92 inthe housing 15.
  • a valve member 91 is provided which is fixed in position in bore 92.
  • the piston has a counter-bored section 94 receiving a spring 95 which also engages the valve member 91.
  • Valve member 91 has a central bore 97 therethrough and has a valve seat 98 formed therein engaged by a ball 99.
  • a spring 101 urges ball 99 against seat 98 and engages a disc 102 having a central bore 103 which is mounted in the end of the bore 92.
  • Bore 92 has a port 105 connected to the sump 28 and further has a port 106 communicating with a chamber 107 at the left end of the valve as viewed in FIG. 1.
  • a port 108 and a port 109 connected to a chamber 110 between piston 90 and valve member 91 and a restriction 111 is provided in the port 109.
  • a conduit interconnects ports 106 and 109 which will later
  • the improved brake actuator 26 includes a piston which carries a collar 121.
  • the collar 121 has an end 122 of a brake band 123 secured therein.
  • the piston 120 is slidable in a bore 125 provided in the housing 15.
  • the piston 120 is counter-bored at 127 to receive spring 128 which engages the end of bore 125 and urges the piston 120 to the right as viewed in FIG. l.
  • Pressure ports 130 and 131 are provided for the brake actuator 26.
  • a uid conduit interconnects the port 44 of pump 21, port 78 of valve 25, port 130 of brake actuator 26, and port 108 of bypass/relief valve 24.
  • a uid conduit 141 interconnects port 45 of pump 21, ports 58 and 59 of agitator motor 22, port 131 of brake actuator 26, and ports 106 and 109 of the bypass/relief valve.
  • a branch conduit 142 is provided connecting conduit 141 to the reversing valve 54.
  • a conduit 144 connects port 78 of the agitator control valve 23 to each end of the reversing valve' 54.
  • the pressure in conduit 141 will also be communicated through ports 106, 109 to chambers 107, 110 of bypass/ relief valve 24. In the event the pressure in conduit 141 exceeds some predetermined maximum, ball 99 will move from seat 98 to relieve the pressure. In case of a rapid pressure surge, since the restriction 111 impedes the How into the chamber 110, the pressure in chamber 107 will momentarily exceed the pressure in chamber 110. Piston 90 will then move to the right to allow the surge pressure in conduit 141 to flow into port 108 and conduit 140 to return to the inlet port 44 of the pump.
  • the brake actuator 26 receives fluid pressure through port 131 to move the brake actuator piston 120 to the right to hold the brake band l123 expanded to engage the lixed case section 37 and thus hold the clothes basket 11 stationary.
  • the spring 128 at the completion of the spin cycle moves the piston 120 to the right to expand the brake band 123 and stop the spinning of the basket as is more completely described in copending application S.N. 671,675, filed Sept. 29, 1967 mentioned above.
  • the improved structure of the present invention utilizes the additional pressure through port 131 on piston 120 to enagage the brake band with increased force to hold the clothese basket 11 stationary and thus eliminate the need for a pressure actuated positive stop pin mechanism to hold the clothes basket, as is previously known.
  • pressure is exhausted from reversing valve 54 into conduit 144 and port 78 into the bore 75 of rotary control valve 23.
  • the spool 70 of valve 23 may be rotated such that an orifice of desired size is provided between the slot 76 and exhaust port 79. This orifice will control the flow of escape fluid from the unpressurized portion of chamber 53 of the agitator motor 22.
  • the speed of the agitator motor 22 can be conveniently controlled merely by adjusting the size of the orifice defined by the slot 76 and exhaust port 79 and thereby provide an infinitely variable control of the speed of agitator motor 22.
  • Pressure in conduit 140 will also be supplied through port 78 to bore 75 of rotary control valve 25.
  • spool 79 of valve 2S may be rotated to define an orifice between slot 76 and port 79 of the valve 25.
  • the output of fluid pressure from pump 21 into conduit 140 may be variably restricted.
  • restriction of the output fluid pressure to the sump through port 79 will tend to lock up the pump 21 and cause a reaction that the basket 11 will be rotated.
  • the speed of rotation of the basket 11 may thus be infinitely varied by adjustment of the size of the orifice defined by slot 76 and port 79 of valve 25. If the pressure in conduit 140 exceeds some predetermined maximum, relief piston 81 will be moved against the force of spring 82 to open conduit 140 to the sump through port 87 of valve 25 to relieve excessive pressures.
  • the rotary control valves 23 and 25 simplify previously used reciprocating valves to define an orifice size.
  • the rotary valves 23, 25 are easily machined and provide precise control of orifice size.
  • the rotary valves can be conveniently mounted in a stationary part of the transmission to simplify the orifice control structure over that which is required when valves are installed in a rotary part in the transmission.
  • a stationary case 200 including the case section 37 previously mentioned above is provided which has journalled in it at one end a drive shaft member 39 of electric motor 16 and has journalled in the other end an agitator drive shaft 51 and a hollow shaft 201 connected to drive clothes basket 11.
  • a general numeral 15 has previously been given for the housing structure which comprises in general the rotating part of the transmission mechanism. This rotating housing 15 is connected to the hollow shaft 201 and thus to the basket 11.
  • Case 200 includes a case section 72 having a pilot portion 206 thereon in which drive member 39 is rotatably journalled.
  • the control valves 23 and 25 are mounted in case section 72 of stationary case 200 on opposite sides of drive member 39 so that they may be conveniently controlled.
  • Pilot portion 206 has rotary fluid communication with the rotating housing 15 to support the housing and to provide the necessary communication between the outlet ports of the pump 21 and the control valves 23 and 25.
  • the housing 15 includes a section including a brake actuator 26 and bypass/relief valve 24, a section containing pump 21, and a section containing agitator motor 22.
  • the case 200 also has an end section 208 in which shafts 51 and 201 are journalled. Case sections 37, 72 and 208 together define a fluid tight reservoir 28 and container for the transmission. Casing 200 further includes a motor section 209 containing electric motor 16 and water pump 17.
  • the improved components of the present invention provide an extremely compact transmission mechanism in that the electric motor 16, water pump 17, pump 21 and agitator motor 22 are all mounted within a common housing and are coaxial.
  • Rotary connections have been provided between the housing 15 and the stationary housing 200 so that the rotary control valves can be mounted in a stationary location and yet control operation of the parts contained in the housing 15.
  • the stationary case 200 not only provides a housing for the hydraulic transmission and its sump but also further provides a mounting for the electric motor and water pump which is isolated from the transmission and sump.
  • a fabric treating machine having a fabric container, an agitator associated with said container, a transmission to selectively drive the fabric container or the agitator, a source of fluid pressure, a brake mechanism operatively connected to said fabric container, actuating means being selectively actuatable to release said brake mechanism for drive of said fabric container, means eX- erting a predetermined force on said actuating means to actuate said brake mechanism to stop rotation of said fabric container, said actuating means including fluid pressure responsive means connectible to said source of pressure to engage said brake mechanism with additional force to hold said fabric container stationary when said agitator is driven.
  • a fabric treating machine ⁇ as claimed in claim 1 wherein said means includes a hydraulic actuated piston connected to said brake mechanism.
  • a fabric treating machine as claimed in claim Z wherein said means includes resilient means adapted to move said piston to engage said brake mechanism and said iiuid responsive means is adapted to selectively augment the action of said resilient means to hold said fabric container stationary.
  • said means further including a fluid pressure responsive means to selectively move said piston against the force of said resilient means to release said brake mechanism.
  • a fabric treating machine having a fabric container, an agitator associated with said container and a transmission to selectively drive the fabric container or the agitator, a source of fluid pressure for the transmission, said machine having a spin cycle of operation in which said fabric container is driven and an agitate cycle of operation in which said agitator is driven, a brake mechanism operatively connected to said fabric container, actuating means selectively actuatable to release said brake mechanism at the beginning of said spin cycle to permit drive of said fabric container, means exerting a predetermined force on said actuating means to actuate said brake mechanism to stop rotation of said fabric container at the completion of said spin cycle, said actuating means including fluid pressure responsive means connectible to said source of pressure to actuate said brake mechanism with additional force to hold said fabric container stationary during said agitate cycle.
  • a fabric treating machine including a fabric container, a motor having a rotatable drive member, a hydraulic pump comprising a pumping element and a pump housing element which are relatively rotatable, a fixed case enclosing said pump, one of said elements connected to said drive member and the other of said elements connected to said container, means including a.
  • rotary valve for selectively restricting the flow of fluid from said pump to induce rotation of said container by said pump element attached thereto whereby the rotational speed of said container is responsive to said restricting means, speed control means associated iwith said restricting means operative to vary the position of said restricting means thereby varying the speed of rotation of said container, brake means connected to said pump element connected to said fabric container and adapted to contact said fixed case to decelerate rotation of said pump element and thereby said container, actuating means attached to said brake means to position said brake means out of contact with said fixed case when said container is rotated and means urging said brake means into contact with said fixed case with a predetermined force when said motor is deactivated, and Said brake means including fluid pressure responsive means augmenting said urging means to thereby hold said container stationary while said motor is rotating said drive member.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Fluid-Pressure Circuits (AREA)
US772299A 1968-10-31 1968-10-31 Brake actuator for hydraulic transmission Expired - Lifetime US3533251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77229968A 1968-10-31 1968-10-31

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US3533251A true US3533251A (en) 1970-10-13

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US772299A Expired - Lifetime US3533251A (en) 1968-10-31 1968-10-31 Brake actuator for hydraulic transmission

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US (1) US3533251A (enrdf_load_stackoverflow)
JP (1) JPS497269B1 (enrdf_load_stackoverflow)
BR (1) BR6913190D0 (enrdf_load_stackoverflow)
DE (1) DE1954389C3 (enrdf_load_stackoverflow)
FR (1) FR2022044A1 (enrdf_load_stackoverflow)
GB (1) GB1258606A (enrdf_load_stackoverflow)
ZA (1) ZA696941B (enrdf_load_stackoverflow)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113638199B (zh) * 2020-04-27 2023-08-29 青岛海尔洗衣机有限公司 一种洗衣机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330138A (en) * 1965-12-13 1967-07-11 Borg Warner Clothes washing machine and hydraulic transmission
US3334496A (en) * 1965-04-05 1967-08-08 Borg Warner Hydrostatic transmission
US3373660A (en) * 1965-12-13 1968-03-19 Borg Warner Fluid drive mechanism
US3443405A (en) * 1967-09-29 1969-05-13 Borg Warner Hydrostatic washer transmission

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3334496A (en) * 1965-04-05 1967-08-08 Borg Warner Hydrostatic transmission
US3330138A (en) * 1965-12-13 1967-07-11 Borg Warner Clothes washing machine and hydraulic transmission
US3373660A (en) * 1965-12-13 1968-03-19 Borg Warner Fluid drive mechanism
US3443405A (en) * 1967-09-29 1969-05-13 Borg Warner Hydrostatic washer transmission

Also Published As

Publication number Publication date
FR2022044A1 (enrdf_load_stackoverflow) 1970-07-24
ZA696941B (en) 1971-04-28
DE1954389A1 (de) 1970-05-06
DE1954389C3 (de) 1975-07-31
BR6913190D0 (pt) 1973-01-23
JPS497269B1 (enrdf_load_stackoverflow) 1974-02-19
DE1954389B2 (de) 1974-12-12
GB1258606A (enrdf_load_stackoverflow) 1971-12-30

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