EP2466136A1 - Piston and pressure pump - Google Patents

Piston and pressure pump Download PDF

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Publication number
EP2466136A1
EP2466136A1 EP10195056A EP10195056A EP2466136A1 EP 2466136 A1 EP2466136 A1 EP 2466136A1 EP 10195056 A EP10195056 A EP 10195056A EP 10195056 A EP10195056 A EP 10195056A EP 2466136 A1 EP2466136 A1 EP 2466136A1
Authority
EP
European Patent Office
Prior art keywords
piston
cavity
section
piston body
diameter
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.)
Withdrawn
Application number
EP10195056A
Other languages
German (de)
French (fr)
Inventor
Roberto Ricci
Gianbattista Fischetti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP10195056A priority Critical patent/EP2466136A1/en
Priority to PCT/EP2011/072995 priority patent/WO2012080436A1/en
Publication of EP2466136A1 publication Critical patent/EP2466136A1/en
Withdrawn legal-status Critical Current

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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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons

Definitions

  • the invention relates to a piston and a pressure pump comprising the piston.
  • High pressure pumps for combustion engines should deliver the necessary mass flow and the necessary fluid pressure.
  • High pressure pumps in combustion engines are subject to high mechanical stress.
  • high pressure pumps in combustion engines are exposed to pressures up to more than 2,000 bar. Therefore, the components as well as the construction of high pressure pumps are subject to high requirements.
  • the object of the invention is to provide a piston and a pressure pump which contribute to improve an efficiency of the pressure pump.
  • the invention is distinguished by a piston suitable for a pressure pump which comprises a cylinder housing with a cylinder chamber and a guiding section.
  • the piston includes a central longitudinal axis and comprises a piston body with a cavity.
  • Such a piston has the advantage that the mass of the piston may be reduced and therefore forces of inertia caused by an alternate motion of the piston may be reduced.
  • a reduction of the piston mass may allow to increase a pumping speed.
  • an engine torque of a drive arrangement, designed and arranged to control the piston performing a pump stroke can be reduced.
  • a spring load of a return spring may be reduced.
  • the return spring may be designed and arranged in the pressure pump providing a return spring force to the piston to effect a piston return stroke.
  • the cavity comprises a circular cross section area along the central longitudinal axis. In this way a simple and cost-efficient manufacturing may be possible.
  • the cavity extends with a given length from a first axial end of the piston body along the central longitudinal axis.
  • the cavity may be provided by drilling.
  • the piston body comprises a piston section with a first piston body diameter and a push rod section with a second piston body diameter.
  • the second piston body diameter may be smaller than the first piston body diameter. In this way the mass of the piston can be reduced.
  • the cavity comprises at least two cavity sections, a first cavity section with a first cavity diameter and a second cavity section with a second cavity diameter. In this way it may possible to design respectively the first cavity diameter and the second cavity diameter dependent on a piston body diameter.
  • the piston body comprises a tube section and a cylindrical part, wherein the tube section and the cylindrical part are fixedly coupled in a contact area.
  • the piston body comprises two pieces.
  • the two pieces, especially the tube section, may be assembled with low costs.
  • the coupling in the contact area is assembled via press-fit. In this way a simple and cost-efficient manufacturing of the piston may be possible.
  • the piston comprises a sealing element arranged in the cavity.
  • the sealing element may prevent a fluid and/or a gas present in the cylinder chamber and/or in the guiding section running into the piston body.
  • the sealing element may be arranged in the cavity such that it closes the cavity approximately at the first axial end of the piston body.
  • the sealing element comprises a plug or a deep-drawn part.
  • the plug or the deep-drawn part may be welded to the piston body and/or the plug or deep-drawn part may be at least partly press fitted into the cavity.
  • the sealing element comprises a sphere.
  • the sphere may be welded to the piston body and/or the sphere may be press fitted into the cavity.
  • the invention is distinguished by a pressure pump comprising a cylinder housing with a cylinder chamber, a guiding section and a piston according to the first aspect including the central longitudinal axis.
  • the piston is arranged in the pressure pump such that it is axially moveable in the guiding section in order to provide a pressurisation within the cylinder chamber.
  • Advantageous embodiments of the first aspect are also valid for the second aspect.
  • FIG. 1 shows a pressure pump 10 with a cylinder housing 12.
  • the pressure pump 10 may be, for instance, part of a fuel system of a combustion engines, e. g. of an common rail injection system.
  • the cylinder housing 12 comprises a cylinder chamber 14 and a guiding section 16 which takes up a piston 100.
  • the piston 100 including a central longitudinal axis L, is arranged in the pressure pump 10 such that it is axially moveable in the guiding section 16 in order to provide a pressurisation within the cylinder chamber 14 to compress a fluid which is delivered to the cylinder chamber 14.
  • the pump 10 may comprise an inlet valve 18 and an outlet valve 20.
  • the inlet valve 18 and the outlet valve 20 are arranged in the cylinder housing 12.
  • the cylinder housing 12 comprises an inlet tube 22 and an outlet tube 24.
  • the piston 100 To fill the cylinder chamber 14 with fluid the piston 100 has to move in axial direction and fluid can stream into the cylinder chamber 14 via the inlet valve 18 and the inlet tube 22. An opposite movement of the piston 100 compresses the fluid in the cylinder chamber 14. The compressed fluid may be ejected via the outlet valve 20 and the outlet tube 24.
  • the piston 100 may be driven by a cam shaft with one or more cams imparting drive to the piston 100 respectively to a push rod section 150 of the piston 100, so that the piston 100 performs a pumping stroke.
  • the pressure pump 10 may comprise a return spring arranged and designed to provide a return stroke force to the piston 100.
  • Figure 2 shows a section view of a first embodiment of the piston 100.
  • the piston 100 including the central longitudinal axis L comprises a piston body 120 with a cavity.
  • the cavity extends with a given length from a first axial end of the piston body 120 along the central longitudinal axis L
  • the piston body 120 may comprise a steel or may be of steel.
  • the piston 100 comprises a piston section 140 and a push rod section 150, e. g. each with a cylindrical shape.
  • the piston section 140 comprises a first piston body diameter and a the push rod section 150 comprises a second piston body diameter.
  • the first piston diameter is bigger than the second piston diameter.
  • the cavity of the piston body 120 may comprise a first cavity section 135 with a first cavity diameter and a second cavity section 137 with a second cavity diameter.
  • the piston body 120 may comprise one piece.
  • the first 135 and second cavity section 137 may by assembled by drilling.
  • the piston 100 comprises a sealing element 160 arranged in the cavity.
  • the sealing element 160 comprises, for instance, a sphere.
  • the sphere may be welded to the piston body 120 and/or the sphere may be press fitted into the cavity.
  • the sealing element 160 may comprise a plug or a deep-drawn part.
  • the push rod section 150 may comprise a thread 170 being arranged at a second axial end of the piston body 120.
  • Figure 3 shows a section view of a second embodiment of the piston 100.
  • the piston 100 including the central longitudinal axis L comprises the piston body 120 with the cavity.
  • the cavity extends with the given length from the first axial end of the piston body 120 along the central longitudinal axis L
  • the piston 100 comprises the piston section 140 and the push rod section 150, e. g. each with a cylindrical shape.
  • the piston section 140 comprises the first piston body diameter and the push rod section 150 comprises the second piston body diameter.
  • the first piston diameter is bigger than the second piston diameter.
  • the cavity of the piston body 120 may comprise the first cavity section 135 with the first cavity diameter and the second cavity section 137 comprises the second cavity diameter.
  • the piston body 120 comprises a tube section and a cylindrical part, wherein the tube section and the cylindrical part are fixedly coupled in a contact area.
  • the coupling in the contact area may be assembled via press-fit.
  • the second cavity section 137 may be assembled by drilling.
  • the tube section and/or the cylindrical part may comprise a steel or may be of steel.
  • the piston 100 comprises the sealing element 160 arranged in the cavity.
  • the sealing element 160 comprises, for instance, a deep-drawn part.
  • the deep-drawn part may be welded to the piston body 120 and/or the deep-drawn may be press fitted into the cavity.
  • the sealing element 160 may comprise the plug or the sphere.
  • the push rod section 150 may comprise the thread 170 being arranged at the second axial end of the piston body 120.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)

Abstract

A piston (100) suitable for a pressure pump (10) comprising a cylinder housing (12) with a cylinder chamber (14) and a guiding section (16) comprises a piston body (120) with a cavity. The piston (100) includes a central longitudinal axis (L).

Description

  • The invention relates to a piston and a pressure pump comprising the piston.
  • High pressure pumps for combustion engines should deliver the necessary mass flow and the necessary fluid pressure. High pressure pumps in combustion engines are subject to high mechanical stress. For example, high pressure pumps in combustion engines are exposed to pressures up to more than 2,000 bar. Therefore, the components as well as the construction of high pressure pumps are subject to high requirements.
  • The object of the invention is to provide a piston and a pressure pump which contribute to improve an efficiency of the pressure pump.
  • This object is achieved by the features of the independent claims. Advantageous embodiments of the invention are given in the sub-claims.
  • According to a first aspect the invention is distinguished by a piston suitable for a pressure pump which comprises a cylinder housing with a cylinder chamber and a guiding section. The piston includes a central longitudinal axis and comprises a piston body with a cavity.
  • Such a piston has the advantage that the mass of the piston may be reduced and therefore forces of inertia caused by an alternate motion of the piston may be reduced. A reduction of the piston mass may allow to increase a pumping speed. Additionally or alternatively an engine torque of a drive arrangement, designed and arranged to control the piston performing a pump stroke, can be reduced. Also a spring load of a return spring may be reduced. The return spring may be designed and arranged in the pressure pump providing a return spring force to the piston to effect a piston return stroke.
  • In an advantageous embodiment the cavity comprises a circular cross section area along the central longitudinal axis. In this way a simple and cost-efficient manufacturing may be possible.
  • In a further advantageous embodiment the cavity extends with a given length from a first axial end of the piston body along the central longitudinal axis. In this way a simple and cost-efficient manufacturing may be possible. The cavity may be provided by drilling.
  • In a further advantageous embodiment the piston body comprises a piston section with a first piston body diameter and a push rod section with a second piston body diameter. Preferably the second piston body diameter may be smaller than the first piston body diameter. In this way the mass of the piston can be reduced.
  • In a further advantageous embodiment the cavity comprises at least two cavity sections, a first cavity section with a first cavity diameter and a second cavity section with a second cavity diameter. In this way it may possible to design respectively the first cavity diameter and the second cavity diameter dependent on a piston body diameter.
  • In a further advantageous embodiment the piston body comprises a tube section and a cylindrical part, wherein the tube section and the cylindrical part are fixedly coupled in a contact area. In this case the piston body comprises two pieces. The two pieces, especially the tube section, may be assembled with low costs. In a further advantageous embodiment the coupling in the contact area is assembled via press-fit. In this way a simple and cost-efficient manufacturing of the piston may be possible.
  • In a further advantageous embodiment the piston comprises a sealing element arranged in the cavity. Advantageously the sealing element may prevent a fluid and/or a gas present in the cylinder chamber and/or in the guiding section running into the piston body. The sealing element may be arranged in the cavity such that it closes the cavity approximately at the first axial end of the piston body.
  • In a further advantageous embodiment the sealing element comprises a plug or a deep-drawn part. The plug or the deep-drawn part may be welded to the piston body and/or the plug or deep-drawn part may be at least partly press fitted into the cavity.
  • In a further advantageous embodiment the sealing element comprises a sphere. The sphere may be welded to the piston body and/or the sphere may be press fitted into the cavity.
  • According to a second aspect the invention is distinguished by a pressure pump comprising a cylinder housing with a cylinder chamber, a guiding section and a piston according to the first aspect including the central longitudinal axis. The piston is arranged in the pressure pump such that it is axially moveable in the guiding section in order to provide a pressurisation within the cylinder chamber. Advantageous embodiments of the first aspect are also valid for the second aspect.
  • Exemplary embodiments of the invention are shown in the following with the aid of schematic drawings. These are as follows:
    • Figure 1
    a schematic drawing of a pressure pump,
    Figure 2
    a section view of a first embodiment of a piston and
    Figure 3
    a section view of a second embodiment of the piston.
    Elements of the same design and function that appear in different illustrations are identified by the same reference character.
  • Figure 1 shows a pressure pump 10 with a cylinder housing 12. The pressure pump 10 may be, for instance, part of a fuel system of a combustion engines, e. g. of an common rail injection system. The cylinder housing 12 comprises a cylinder chamber 14 and a guiding section 16 which takes up a piston 100. The piston 100, including a central longitudinal axis L, is arranged in the pressure pump 10 such that it is axially moveable in the guiding section 16 in order to provide a pressurisation within the cylinder chamber 14 to compress a fluid which is delivered to the cylinder chamber 14. Furthermore, the pump 10 may comprise an inlet valve 18 and an outlet valve 20. The inlet valve 18 and the outlet valve 20 are arranged in the cylinder housing 12. Furthermore, the cylinder housing 12 comprises an inlet tube 22 and an outlet tube 24.
  • To fill the cylinder chamber 14 with fluid the piston 100 has to move in axial direction and fluid can stream into the cylinder chamber 14 via the inlet valve 18 and the inlet tube 22. An opposite movement of the piston 100 compresses the fluid in the cylinder chamber 14. The compressed fluid may be ejected via the outlet valve 20 and the outlet tube 24.
  • The piston 100, for instance, may be driven by a cam shaft with one or more cams imparting drive to the piston 100 respectively to a push rod section 150 of the piston 100, so that the piston 100 performs a pumping stroke. Furthermore the pressure pump 10 may comprise a return spring arranged and designed to provide a return stroke force to the piston 100.
  • Figure 2 shows a section view of a first embodiment of the piston 100. The piston 100 including the central longitudinal axis L comprises a piston body 120 with a cavity. The cavity extends with a given length from a first axial end of the piston body 120 along the central longitudinal axis L The piston body 120 may comprise a steel or may be of steel.
  • Furthermore the piston 100 comprises a piston section 140 and a push rod section 150, e. g. each with a cylindrical shape. The piston section 140 comprises a first piston body diameter and a the push rod section 150 comprises a second piston body diameter. Preferably the first piston diameter is bigger than the second piston diameter. The cavity of the piston body 120 may comprise a first cavity section 135 with a first cavity diameter and a second cavity section 137 with a second cavity diameter. The piston body 120 may comprise one piece. The first 135 and second cavity section 137 may by assembled by drilling.
  • The piston 100 comprises a sealing element 160 arranged in the cavity. The sealing element 160 comprises, for instance, a sphere. The sphere may be welded to the piston body 120 and/or the sphere may be press fitted into the cavity. Alternatively the sealing element 160 may comprise a plug or a deep-drawn part.
  • The push rod section 150 may comprise a thread 170 being arranged at a second axial end of the piston body 120.
  • Figure 3 shows a section view of a second embodiment of the piston 100. The piston 100 including the central longitudinal axis L comprises the piston body 120 with the cavity. The cavity extends with the given length from the first axial end of the piston body 120 along the central longitudinal axis L
  • Furthermore the piston 100 comprises the piston section 140 and the push rod section 150, e. g. each with a cylindrical shape. The piston section 140 comprises the first piston body diameter and the push rod section 150 comprises the second piston body diameter. Preferably the first piston diameter is bigger than the second piston diameter. The cavity of the piston body 120 may comprise the first cavity section 135 with the first cavity diameter and the second cavity section 137 comprises the second cavity diameter.
  • The piston body 120 comprises a tube section and a cylindrical part, wherein the tube section and the cylindrical part are fixedly coupled in a contact area. The coupling in the contact area may be assembled via press-fit. The second cavity section 137 may be assembled by drilling. The tube section and/or the cylindrical part may comprise a steel or may be of steel.
  • The piston 100 comprises the sealing element 160 arranged in the cavity. The sealing element 160 comprises, for instance, a deep-drawn part. The deep-drawn part may be welded to the piston body 120 and/or the deep-drawn may be press fitted into the cavity. Alternatively the sealing element 160 may comprise the plug or the sphere.
  • The push rod section 150 may comprise the thread 170 being arranged at the second axial end of the piston body 120.

Claims (11)

  1. Piston (100) suitable for a pressure pump (10) which comprises a cylinder housing (12) with a cylinder chamber (14) and a guiding section (16), with the piston (100) including a central longitudinal axis (L) and with the piston (100) comprising a piston body (120) with a cavity.
  2. Piston (100) according to claim 1, wherein the cavity comprises a circular cross section area along the central longitudinal axis (L).
  3. Piston (100) according to claim 1 or 2, wherein the cavity extends with a given length from a first axial end of the piston body (120) along the central longitudinal axis (L).
  4. Piston (100) according to one of the proceeding claims, wherein the piston body (120) comprises a piston section (140) with a first piston body diameter and a push rod section (150) with a second piston body diameter.
  5. Piston (100) according to one of the proceeding claims, wherein the cavity comprises at least two cavity sections, a first cavity section (135) with a first cavity diameter and a second cavity section (137) with a second cavity diameter.
  6. Piston (100) according to one of the proceeding claims with the piston body (120) comprising a tube section and a cylindrical part, wherein the tube section and the cylindrical part are fixedly coupled in a contact area.
  7. Piston (100) according to claim 6, with the coupling in the contact area being assembled via press-fit.
  8. Piston (100) according to one of the proceeding claims, wherein the piston (100) comprises a sealing element (150) arranged in the cavity.
  9. Piston (100) according to claim 8, wherein the sealing element (150) comprises a plug or a deep-drawn part.
  10. Piston (100) according to claim 8, wherein the sealing element (150) comprises a sphere.
  11. Pressure pump (10) comprising a cylinder housing (12) with a cylinder chamber (14), a guiding section (16) and a piston (100) according to one of the claims 1 to 10 including the central longitudinal axis (L), with the piston (100) being arranged in the pressure pump such that it is axially moveable in the guiding section (16) in order to provide a pressurisation within the cylinder chamber (14).
EP10195056A 2010-12-15 2010-12-15 Piston and pressure pump Withdrawn EP2466136A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10195056A EP2466136A1 (en) 2010-12-15 2010-12-15 Piston and pressure pump
PCT/EP2011/072995 WO2012080436A1 (en) 2010-12-15 2011-12-15 Piston and pressure pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10195056A EP2466136A1 (en) 2010-12-15 2010-12-15 Piston and pressure pump

Publications (1)

Publication Number Publication Date
EP2466136A1 true EP2466136A1 (en) 2012-06-20

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ID=43919795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10195056A Withdrawn EP2466136A1 (en) 2010-12-15 2010-12-15 Piston and pressure pump

Country Status (2)

Country Link
EP (1) EP2466136A1 (en)
WO (1) WO2012080436A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469776A (en) * 1994-07-13 1995-11-28 Danfoss A/S Hydraulic pumping device
DE19734217A1 (en) * 1996-08-08 1998-02-12 Caterpillar Inc Method of making a piston assembly
DE19859199A1 (en) * 1998-12-21 2000-07-13 Brueninghaus Hydromatik Gmbh Joint connection between shaft and guide shoe of axial piston engine has connection part with edge section having convex shoulder parts to engage over ball head on second connection part
DE19934217A1 (en) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Piston arrangement for a piston engine
WO2005028928A2 (en) * 2003-09-10 2005-03-31 Brueninghaus Hydromatik Gmbh Hollow piston for a piston engine and method for producing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5469776A (en) * 1994-07-13 1995-11-28 Danfoss A/S Hydraulic pumping device
DE19734217A1 (en) * 1996-08-08 1998-02-12 Caterpillar Inc Method of making a piston assembly
DE19859199A1 (en) * 1998-12-21 2000-07-13 Brueninghaus Hydromatik Gmbh Joint connection between shaft and guide shoe of axial piston engine has connection part with edge section having convex shoulder parts to engage over ball head on second connection part
DE19934217A1 (en) * 1999-07-21 2001-02-01 Brueninghaus Hydromatik Gmbh Piston arrangement for a piston engine
WO2005028928A2 (en) * 2003-09-10 2005-03-31 Brueninghaus Hydromatik Gmbh Hollow piston for a piston engine and method for producing the same

Also Published As

Publication number Publication date
WO2012080436A1 (en) 2012-06-21

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