US3330380A - Reversing valve assemblies for centralized lubricating systems - Google Patents

Reversing valve assemblies for centralized lubricating systems Download PDF

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Publication number
US3330380A
US3330380A US358831A US35883164A US3330380A US 3330380 A US3330380 A US 3330380A US 358831 A US358831 A US 358831A US 35883164 A US35883164 A US 35883164A US 3330380 A US3330380 A US 3330380A
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United States
Prior art keywords
plunger valve
pilot
plunger
valve
accumulator
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Expired - Lifetime
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US358831A
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English (en)
Inventor
Fujita Hiroshi
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Daikin Industries Ltd
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Daikin Industries Ltd
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Publication date
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N25/00—Distributing equipment with or without proportioning devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N25/00—Distributing equipment with or without proportioning devices
    • F16N25/02—Distributing equipment with or without proportioning devices with reciprocating distributing slide valve
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback

Definitions

  • This invention relates generally to single-line type centralized lubricating systems including a single oil pressure pump and a plurality of distributing valves arranged to supply appropriate quantities of lubricating oil to many areas to be lubricated.
  • the present invention relates to switching valve assemblies as one of the most essential parts of such centralized lubricating system and provides an improved reversing valve assembly constructed upon an entirely novel conception.
  • One of the objects of the present invention is to provide a novel reversing valve assembly for use in a centralized lubricating system which comprises a main valve, pilot valve and an accumulator plunger associated with said mechanisms so as to operate to store fluid returning to the valve assembly at the end of each distributing cycle of operation to actuate the pilot valve when a predetermined pressure has been reached.
  • the switching valve assembly according to the present invention is normally connected on one hand, to the opposite ends of a loop of conduit which includes a plurality of seriesconnected distributor valves and, on the other hand, to an oil pressure pump and is automatically operable to direct the fluid therefrom into the conduit alternately through its two end connections with the valve assembly.
  • the valve assembly has a casing body A which has formed therein three cylindrical plunger-accommodating cavities a, b and c and two spaced openings 5 and 5 to be connected with the opposite ends of the fluid circuit 6 including distributor valves D.
  • Each of the openings 5 and 5 alternately serve as an outlet and a return port of the valve assembly, as will be described below.
  • Slidably fitted in one of the cavities a is a main plunger 1 which operates to direct fluid from an oil pressure pump P to the distributor circuit alternately through the two openings 5 and 5', which are connected with the cavity a as shown.
  • Slidably fitted in another cavity b is a pilot plunger 2 which is operable to limit the stroke movement of the main plunger 1.
  • an accumulator or pressure-storing plunger 3 which aids the pilot plunger in its movement and also serves to store or take up the surges of pressure energy appearing in the return opening 5 or 5'.
  • Passage 7 receives fluid from pump P and delivers it to both cavities a and b at points intermediate ice the ends thereof.
  • Passage 8 interconnects the left-hand end of cavity a and a point in cavity b located slightly to the left of the opening of the passage 7 to the cavity b.
  • Passage 9 connects cavity a with the right-hand ends of cavities b and c.
  • Passage 10 interconects the righthand end of cavity a and a point in cavity b located slightly to the right of the opening for the passage 7 in the cavity b in symmetrical relation to passage 7.
  • Passages 10 and 11 are formed in symmetrical relation to the passages 8 and 9, respectively, as seen in the drawing.
  • Passage 12 is connected with a line leading to an oil reservoir tank T and opens to the right and left portions of cavity a to receive oil therethrough and return it to the oil tank T.
  • passage 13 is also connected with a line leading to the oil tank T and opens to the right and left portions of the cavity b to receive oil therethrough and return it to the oil tank T.
  • the main and pilot plungers 1 and 2 are shaped symmetrically, plunger 1 having formed therein two pairs of spaced reduced-diameter portions and plunger 2 having one pair of reduced-diameter portions.
  • the pilot plunger 2 is also formed near each of its ends with pairs of closely spaced peripheral grooves of generally V-shaped cross section to receive spring-biased detent balls 4 and 4' which are received in bores formed in the casing body as illustrated.
  • the accumulator plunger 3 is cylindrical wit-h a pair of compression springs 14 and 14' arranged between the plunger and the adjacent end walls of the cavity c.
  • An indicator rod 15 is secured to one end of the main plunger 1 substantially in axial alignment therewith for indicating the positioning of the main plunger 1.
  • each of distributor valves D is operable when fed with fluid to distribute the fluid to associated areas to be lubricated, asindicated by the arrows.
  • the arrows annexed to the lines leading from and to the pump P and oil tank T indicate the direction of flow in the associated lines.
  • lubricant is delivered into passage 7 and directed to flow past the main and pilot plungers 1 and 2.
  • the lubricant flow passing the pilot plunger 2 proceeds into passage 8 and through it enters the left-hand end of the cavity a to urge the main plunger 1 housed therein rightward.
  • the lubricant which enters the cavity a through passage 7 flows past the main plunger 1 and through the opening 5 enters the circuit 6 to operate the distributor valves D therein successively.
  • the fluid flowing out of the final distributor valve D returns into the opening 5, now serving as a return port.
  • the returning fluid again flows past the main plunger 1 and enters passage 9 to flow into cavities b and c at the right-hand ends thereof.
  • the returning fluid will actuate the accumulator plunger 3 to the left until a definite amount of fluid is stored to create a predetermined pressure in the free space just formed in the right-hand end of the cavity 0.
  • the fluid in the passage 9 reaches the predetermined pressure, it actuates the pilot plunger 2 to the left overcoming the restraining force offered by the spring biased detent balls 4 and 4'.
  • the pilot 3 plunger On the leftward stroke of the pilot 3 plunger,' as the passage 7 begins to communicate with passage 10 thereby to allow pressure fluid from pump P to enter the passage 10, the fluid returning into the valve assembly through the opening 5 is reduced in pressure because the connection between passage 7 and opening 5 has simultaneously been closed.
  • the main plunger 1 is desirably extended at one end to form an indicator rod 15, which is exposed to the outside of the casing body A enabling the attendant to observe the operation of the switching valve assembly.
  • the delivery pressure of the fluid pump P can have at all times a predetermined value.
  • the pres- .sure oil is directed from the opening 5 to the other opening 5, i.e., to the right-hand end of cavity of the pilot plunger 2 where the pressure is built up to a predetermined value by the function of the spring-biassed detent valves 4 and 4', and by this time the pressure at the opening 5 has reached a considerably high value.
  • the actuation of the pilot plunger 2 here will switch the functions of the respective parts in the reverse way, with the opening 5' serving as an outlet and the opening 5 as a return port, as has been explained previously.
  • the return port 5 is the place where the return pressure, which will be the reversing pressure for the pilot plunger 2, is sensed and the pressure thereat cannot, therefore, be released, for example, to a tank T.
  • the pressure at the opening 5 still remains at a high value as above described, which must be reduced because even a slight pressure which remains thereat will be accumulated one after another as the switching operation is repeated, but on the other hand, the pressure, as has been described, cannot be released to the tank.
  • the accumulator plunger 3 and the compression springs 14, 14' in the present invention serve an unique function of facilitating a reduction in pressure within the cylinder at the time of switching in which the remaining high pressure is absorbed. On account of this function, it is possible to obtain the pressure diiference needed for the operation of the feeders and, consequently, a reversing valve for single-line type centralized lubricating systems of the present invention is achieved. The remaining pressure thus absorbed in the accumulator 3 will not continuously be accumulated therein, as the accumulator communicates with the tank T in the next cycle of distributing operation.
  • the novel feature of the present invention lies essentially in the provision of an accumulator plunger 3, which not only ensures proper operation of the pilot plunger 2 but is also operable to store the high fluid pressure appearing upon completion of each switching cycle in the region of that opening into which fluid returns from the circuit in the preceding distributing cycle of operation. It will be understood, therefore, that, though one embodiment of the invention has been shown and described herein which has a reversing mechanism including a pilot and a main plunger, the accumulator plunger of the present invention may also be used in combination with other forms of switching mechanism which are constructed and function in substantially the same manner as described herein.
  • a centralized lubricating system including a distributing circuit, a reversing valve assembly connected with the opposite ends of said distributing circuit and operable to direct fluid into said distributing circuit alternately through the opposite ends thereof, said reversing valve assembly comprising reciprocating pilot plunger valve means, reciprocating main plunger valve means, a closed accumulator cylinder having a reciprocating accumulator piston therein, conduit means for establishing communication between a pump means and one end of the distributing circuit and for establishing communication with a tank and the other end of the distributing circuit through the main plunger valve in one position and for reversing said order of communication when the main plunger valve is reciprocated to another position, said accumulator cylinder having a pair of axially spaced ports, said piston being movable between said ports, bidirectional biassing means urging the piston toward a medial position between said ports, conduit means for establishing communication between said pump means and said main plunger valve through said pilot plunger valve to reciprocate the main plunger valve between said one and another positions in response
  • said reversing 'valve assembly also includes detent means for said pilot plunger valve whereby movement of said valve in either reciprocatory direction is restrained until a predetermined force is exerted onsaid accumulator piston by said biassing means.
  • said bi-directiona] biassing means comprises a pair of coil springs positioned in said closed cylinder between the respective ends of the cylinder and piston.
  • pilot plunger is formed toward each of its ends with a pair of closely spaced peripheral grooves of generally V-shaped cross section to received a spring biassed detent ball, which is received in a bore formed in the casing body.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Multiple-Way Valves (AREA)
US358831A 1963-04-12 1964-04-10 Reversing valve assemblies for centralized lubricating systems Expired - Lifetime US3330380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1921263 1963-04-12

Publications (1)

Publication Number Publication Date
US3330380A true US3330380A (en) 1967-07-11

Family

ID=11993045

Family Applications (1)

Application Number Title Priority Date Filing Date
US358831A Expired - Lifetime US3330380A (en) 1963-04-12 1964-04-10 Reversing valve assemblies for centralized lubricating systems

Country Status (3)

Country Link
US (1) US3330380A (de)
DE (1) DE1450240B1 (de)
GB (1) GB1062100A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477546A (en) * 1967-06-16 1969-11-11 Eaton Yale & Towne Lubricating oil pumping station and master control center for positive displacement type metering valves
US3526299A (en) * 1968-11-19 1970-09-01 Ingersoll Rand Co Automatic lubricator
US3724600A (en) * 1971-07-29 1973-04-03 Us Navy Submarine outboard greasing system
US3993165A (en) * 1975-10-20 1976-11-23 Veb Schmiergeratewerk Saxonia Lubricant dosing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794518A (en) * 1953-09-21 1957-06-04 Trabon Engineering Corp Lubricating system and sequence valve therefor
US2856023A (en) * 1956-02-01 1958-10-14 Farval Corp Progressive metering valve and fluid pressure system utilizing same
GB894404A (en) * 1957-08-22 1962-04-18 Emmerich Satzger Reversing device for pressure-lubrication equipment

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2094271A (en) * 1931-03-16 1937-09-28 Trabon Engineering Corp Reversible lubricating feeder system
GB845015A (en) * 1957-05-03 1960-08-17 Robert William Travis Improvements in valves suitable for lubricating systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794518A (en) * 1953-09-21 1957-06-04 Trabon Engineering Corp Lubricating system and sequence valve therefor
US2856023A (en) * 1956-02-01 1958-10-14 Farval Corp Progressive metering valve and fluid pressure system utilizing same
GB894404A (en) * 1957-08-22 1962-04-18 Emmerich Satzger Reversing device for pressure-lubrication equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3477546A (en) * 1967-06-16 1969-11-11 Eaton Yale & Towne Lubricating oil pumping station and master control center for positive displacement type metering valves
US3526299A (en) * 1968-11-19 1970-09-01 Ingersoll Rand Co Automatic lubricator
US3724600A (en) * 1971-07-29 1973-04-03 Us Navy Submarine outboard greasing system
US3993165A (en) * 1975-10-20 1976-11-23 Veb Schmiergeratewerk Saxonia Lubricant dosing device

Also Published As

Publication number Publication date
DE1450240B1 (de) 1969-12-11
GB1062100A (en) 1967-03-15

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