US3582239A - Piston pump incorporated by a reciprocating machine component operated by a connecting rod - Google Patents

Piston pump incorporated by a reciprocating machine component operated by a connecting rod Download PDF

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Publication number
US3582239A
US3582239A US812164A US3582239DA US3582239A US 3582239 A US3582239 A US 3582239A US 812164 A US812164 A US 812164A US 3582239D A US3582239D A US 3582239DA US 3582239 A US3582239 A US 3582239A
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United States
Prior art keywords
connecting rod
piston
cylindrical bore
component
action
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US812164A
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English (en)
Inventor
Dante Giacosa
Giovanni Torazza
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Fiat SpA
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Fiat SpA
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Filing date
Publication date
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
    • F04B19/02—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 having movable cylinders
    • F04B19/022—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 having movable cylinders reciprocating cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0053—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for reciprocating distribution members

Definitions

  • the pump comprises a piston slidable in a cylindrical bore provided in the said reciprocating component and acted upon against the action of spring means directly or indirectly by the connecting rod during the oscillations which the latter performs upon the rotation of the crank shaft.
  • the said cylindrical bore is successively connected during the displacements of the reciprocating component along guides provided in a stationary structure with suction and exhaust ports at the beginning of each suc- 417/313 tion and exhaust stroke of the pump piston.
  • the main characteristic feature of the pump according to the invention is that the pump comprises a spring loaded piston slidably mounted in a cylindrical bore formed in the body portion of a machine component reciprocating in a stationary structure and operated by a connecting rod, and said piston being mechanically operated against the action of said spring by the oscillations of the connecting rod so as to define inside of the said bore a compression chamber-of variable volume, the said compression chamber being alternately connected by effect of the reciprocations of the said machine component with suction and exhaust ports provided in the said stationary structure, the said machine component acting with respect to the said ports like a slide valve by connecting the said compression chamber with the suction port when the volume of the said compression chamber starts increasing and connecting the latter with the exhaust port when the said volume starts decreasing.
  • FIG. 1 is a diagrammatical axial sectional view of a piston pump according to the invention, incorporated by a machine component performing a reciprocatory movement operated by a connecting rod;
  • FIG. 2 is a similar view showing the pump and machine component in a further operational position
  • FIG. 3 is an axial sectional view of a pump according to a modification of FIG. 1,
  • FIG. 4 is a front view showing diagrammatically a plurality of suction and exhaust ports cooperating with the pump according to the modified embodiment shown in FIG. 3.
  • Reference numeral 1 denotes a machine component performing a reciprocatory movement and operated by a connecting rod 2, such as, for instance, a compressor piston or the cross head of an internal combustion engine, as in the embodiment shown.
  • the reciprocating component 1 moves over guides 10 formed in a stationary structure and carries on a pivot 3 a connecting rod 2 connected with the crank pin 40 ofa crank shaft 4.
  • the body portion of the reciprocating component I is provided with a shaped inner extension 5 formed with a cylindrical bore 6 in which sealingly moves a piston 7 opposed by a helical spring 8 bearing on a step in the said cylindrical bore.
  • the piston 7 which defines inside of the said cylindrical bore a compression or working chamber of variable volume lying at its side urged upon by the spring 8, is mechanically connected to the connecting rod 2 by means of a short rod 9 one end of which is received by a recess 10 in the piston, its other end being of semispherical shape and being received in a conical recess formed with a rounded bottom provided in a protuberance 11 on the connecting rod 2.
  • the compression chamber of the pump can be connected upon displacements of the reciprocating component 1 along the guides 10 through an end bore 60 with the vertically aligned and spaced suction and exhaust ports 12,13, respectively, provided in one of the said stationary guides 10, the reciprocating component 1 acting thereby like a sleeve valve capable of opening or closing the ports synchronously with the suction and delivery stroke performed by the piston 7 under the action of the angular reciprocations of the connecting rod.
  • the pump operates as follows.
  • fluctuations in pressure originating from the discontinuity of the exhaust strokes may be leveled by connecting the pump to a hydraulic accumulator of suitable volume and elasticity.
  • FIGS. 1 and 2 This may be obtained as shown in FIGS. 1 and 2 by connecting in series with the exhaust port 13 a chamber 15 in the top portion of which a certain quantity of air is trapped.
  • Thischamber is provided with an orifice 16 acting as evacuating means for the fluid circuit when the fluid is a lubricant.
  • Discontinuity in the exhaust may moreover be cut down to one half by providing on the same reciprocating member two pumps in push-pull connection as shown in FIG. 3, wherein 7' and 7 denote the cup-shaped pistons of the said pumps, the cylinders of the latter being so arranged that their compression chambers are each in turn connected with vertically aligned suction and exhaust ports, respectively l2, 13' and 12", 13" staggered there between as shown in FIG. 4.
  • the reciprocating component 1 may be provided with a larger number of parallel or series operating pumps, the reciprocations of the reciprocating member and oscillations of the connecting rod driving the said component being-utilized for operating all the pumps.
  • a machine of the type comprising a stationary structure having formed therein at least one guide surface, a component performing a reciprocatory motion along said surface, and a connecting rod hinged by its one end to the said component and by its other end to the crank-pin of a rotatable crankshaft, at least one pump comprising a piston slidable in a cylindrical bore provided in the said component arranged with its axis lying in a plane substantially parallel to the plane of oscillation of the said connecting rod, one end of the said cylindrical bore being open and facing the said connecting rod while its other end communicates with an opening provided in the surface of the said component sliding along the said guide surface, spring means arranged in the said cylindrical bore urging the piston towards the end of the said bore facing the said connecting road and .thrust means rod interposed between the said piston and the said connecting rod for opposing the free displacements of the piston under the action of the said spring means and for displacing the said piston against the action of the said spring means during the oscillations of the connecting rod in the opposite directions upon the rotation
  • a machine of the type comprising a stationary structure having formed therein a pair of opposite rectilinear guides parallel to each other, a component performing a reciprocatory motion along said surface, and a connecting rod hinged by its one end to the said component and by its other end to the crank-pin of a rotatable crank-shaft, at least one pump comprising a piston slidable in a cylindrical bore provided in the said component arranged with its axis lying in a plane substantially parallel to the plane of oscillation of the said connecting rod, one end of the said c lindrical bore being open and facin the said connecting rod w 1le its other end communicates wit an opening provided in the surface of the said component sliding along one of the said guides, spring means arranged in the said cylindrical bore urging the piston towards the end of the said bore facing the said connecting rod and thrust means rod interposed between the said piston and the said connecting rod for opposing the free displacements of the piston under the action of the said spring means and for displacing the said piston against the action of the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Reciprocating Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US812164A 1968-04-04 1969-04-01 Piston pump incorporated by a reciprocating machine component operated by a connecting rod Expired - Lifetime US3582239A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5117468 1968-04-04

Publications (1)

Publication Number Publication Date
US3582239A true US3582239A (en) 1971-06-01

Family

ID=11274513

Family Applications (1)

Application Number Title Priority Date Filing Date
US812164A Expired - Lifetime US3582239A (en) 1968-04-04 1969-04-01 Piston pump incorporated by a reciprocating machine component operated by a connecting rod

Country Status (3)

Country Link
US (1) US3582239A (enrdf_load_stackoverflow)
DE (1) DE1917429A1 (enrdf_load_stackoverflow)
FR (1) FR1597382A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548254A (en) * 1983-06-30 1985-10-22 Borg-Warner Corporation Method of manufacturing a die-cast wobble plate assembly

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978714A (en) * 1930-09-22 1934-10-30 Fairbanks Morse & Co Lubricating means
US2361153A (en) * 1942-12-22 1944-10-24 Plessey Co Ltd Pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978714A (en) * 1930-09-22 1934-10-30 Fairbanks Morse & Co Lubricating means
US2361153A (en) * 1942-12-22 1944-10-24 Plessey Co Ltd Pump

Also Published As

Publication number Publication date
DE1917429A1 (de) 1970-07-02
FR1597382A (enrdf_load_stackoverflow) 1970-06-22

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