US3912421A - Radial piston machine - Google Patents

Radial piston machine Download PDF

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Publication number
US3912421A
US3912421A US480503A US48050374A US3912421A US 3912421 A US3912421 A US 3912421A US 480503 A US480503 A US 480503A US 48050374 A US48050374 A US 48050374A US 3912421 A US3912421 A US 3912421A
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US
United States
Prior art keywords
piston
housing
cylinder
combination
cylinder sleeves
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
US480503A
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English (en)
Inventor
Robert Gelin
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.)
Bosch Rexroth AG
Original Assignee
GL Rexroth 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 GL Rexroth GmbH filed Critical GL Rexroth GmbH
Application granted granted Critical
Publication of US3912421A publication Critical patent/US3912421A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B15/00—Reciprocating-piston machines or engines with movable cylinders other than provided for in group F01B13/00
    • F01B15/04—Reciprocating-piston machines or engines with movable cylinders other than provided for in group F01B13/00 with oscillating cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0415—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0435—Particularities relating to the distribution members

Definitions

  • ABSTRACT [30] Foreign Application Priority Data
  • a plurality of radially oriented pistons are each sur- June 29, 1973 Germany 2333103 rounded y a Cylinder Sleeve so as to be free to slide within the same.
  • Each of the cylinder sleeves has a ra- [52] us. Cl. 417/273; 417/464; 417/570 dially Outer n which ng g nd rrounds a por- [51] Int. Cl. F04B 1/04; F04B 19/02 tien Of a p p l f e of a Stationary mem- [58] Field of Search 417/273, 319, 570, 464 ber.
  • Inlet and outlet valves are provided in the stationary member on the respective portions of the part- [56] R f e Cit d spherical surface which are surrounded by the radially UNITED STATES PATENTS outer ends of the cylinder sleeves.
  • the present invention relates to a piston machine in general, and in particular to a radial piston machine. Still more specifically, the invention relates to a hydraulic radial piston machine.
  • Radial piston machines which are of the type wherein an eccentric shaft turns and engages piston shoes of radially extending pistons, so that as the shaft turns in sliding engagement with the piston shoes, the pistons are reciprocated in radial direction.
  • the pistons are surrounded by cylinder sleeves the radially outer ends of which are supported by a surrounding stationary member.
  • An additional object of the invention is to provide such a radial piston machine which is of relatively simple and therefore reliable construction, and which has a maximum possible capability for self-priming suction.
  • a radial piston machine in a combination which comprises stationary members having each an inwardly directed part-spherical surface, a plurality of radially oriented pistons, a plurality of cylinder sleeves each surrounding one of the pistons for free relative sliding movement, each of these cylinder sleeves having a radially outer end which engages and surrounds a portion of the respective part-spherical surface, and inlet and outlet valve means in the stationary member and at the respective portions of thepartspective cylinder sleeve, because this produces particularly good suction conditions.
  • the location of the inlet and outlet valve means in this manner directly at the head or outer end of the respective cylinder sleeves provides favorable conditions for proper operation of the radial piston machine as a pump.
  • FIGURE is an axial section through a radial piston machine embodying the invention.
  • FIGURE shows an exemplary embodiment of the radial piston machine of the type under discussion, provided with the novel invention.
  • Reference numeral 1 identifies a shaft which turns about its longitudinal axis and is provided with an eccentric 2.
  • the shaft 1 is journalled at the axially spaced portions la and lb in slide bearings which are mounted on a housing composed of two housing sections 4, 5. These housing sections are provided in their contacting edge faces with a pair of circumferentially extending grooves 39 in which a sealing member 38 is located, so as to seal the junction of the housing sections 4 and 5.
  • a shaft seal 6 seals the point of exit of the shaft 1 from the housing section 4.
  • a plurality of radially distributed pistons and cylinder sleeves Located within the housing are stationary annular members 17, and located radially inward of the members 17 is a plurality of radially distributed pistons and cylinder sleeves. Since the invention can be understood from the description of one of the pistons and cylinder sleeves, and since the manner in which the others are arranged radially inwardly of the members 17 is conventional in radial piston machines, only one piston 13 and its associated cylinder sleeve 14 and member 17 have been illustrated. Each piston 13 cooperates with a piston shoe 7 which is in sliding contact with the eccentric 2 and in axial direction of the shaft 1 is supported against displacement by a pair of sliding rings 9 which in turn are supported on the surface portions 4a and 5a of the housing sections 4 and 5, respectively.
  • the piston shoe 7 is connected with its associated piston 13 by means of a connection which is here in form of a threaded bolt 12.
  • the connection between the piston shoe and the piston is therefore rigid.
  • the bolt 12 is so dimensioned or else may be appropriately weakened by providing it with grooves or the like, that in the event of, for example, excessively high frictional forces that might develop between eccentric 2 and piston shoe 7, the piston shoe 7 will be able to separate from its associated piston 13 due to the bolt 12 shearing off, so that further reciprocation of the piston 13 is precluded to prevent the possibility that still more damage might occur.
  • the piston 13 is surrounded by a cylinder sleeve 14, the radially outer end of which is formed with an annular conically configurated sealing face which cooperates with the part-spherical inwardly directed surface 16 of the member 17.
  • the latter is provided at two axially opposite sides with a pair of oppositely located cylindrical projections 18a, 18b which are matingly received in corresponding bores 19a, 19b formed in the housing sections 4 and 5, respectively.
  • the member 17 is provided with a pin 20 which is guided in an axially extending slot 21 of the housing section 4.
  • a bolt or screw 34 is threaded through an opening in the housing section 4 into the projection 18a in order to fix the same and thereby the member 17 firmly in the housing.
  • the wall of the member 17 is formed with an outlet channel 16a for the cylinder space 24 which is formed in the cylinder sleeve 14; the channel 16a extends first outwardly and then substantially at a right angle in axial direction of the member 17, to form an enlarged portion 16d, an inclined annular surface 16b being provided at the point where the smaller diameter of the channel merges with the larger diameter of the enlarged portion 16d.
  • the enlarged portion 16d in turn merges with an internally threaded portion 160 that extends to the exterior of the machine and into which a nipple 25 having a central bore 25a is threaded.
  • a valve member 26 here in form of a spherical member, is accommodated with some radial play in the enlarged portion 16b and is pressed by a relatively weak spring 27 against the surface 16b which thus acts as a valve seat.
  • a tube 28 is soldered into or otherwise secured to the projection 18b and communicates with the enlarged portion 16d of the channel 16a downstream of the valve member 26.
  • the member 17 Adjacent the channel 16a, the member 17 is formed with a channel 8 which extends to the interior 37 of the housing formed by the sections 4 and 5.
  • the inner end 8a of the channel 8 is closed by a valve member 32 which is located within the actual cylinder space 24 of the cylinder sleeve 14 and which, together with the inner end 8a and a relatively weak contraction spring whose outer convolution 33a is supported on a shoulder 8b formed in the channel 8, constitutes the suction inlet valve.
  • the spring holds the valve member 32 against the inner end 8a but permits it to be moved inwardly of the cylinder space 24 when suction develops in the latter.
  • Reference numeral 49 identifies the inlet opening for the interior 37 of the housing 4, 5.
  • the cylinder sleeve 14 is provided in the region of its radially outer end with an outwardly extending flange 40 which is engages by a helical spring 41 the opposite axial end of which is identified with reference numeral 41a and bears upon the piston shoe 7, thus pressing the sealing face 15 of the cylinder sleeve 14 against the part-spherical surface 16.
  • the force with which the sealing face 15 of the sleeve 14 during this movement of the piston 13 against the part-spherical surface 16 can be calculated as the product of the area of the annular face F of the sleeve 14 and the pressure which exists in the cylinder space 24.
  • the size of the annular face F is determined by the diameter difference between the sealing face 15 and the inner diameter of the sleeve 14.
  • the associated inward retraction of the piston 13 provides suction which lifts the valve member 32 off the inner end 8a of the channel 8 against the opposing force of the spring which holds the valve member 32, and thus permits an inflow of additional fluid from the housing space 37 via the channel 8 whose outer end communicates with the space 37, so that this fluid can enter into the cylinder space 24.
  • the sealing edge 15 of the cylinder sleeve 14 shifts on the part-spherical surface 16 through a small angular distance in the direction of rotation of the shaft 1.
  • a combination comprising a housing; a shaft having an eccentric portion and being rotatably mounted in said housing; a plurality of radially oriented pistons mounted within said housing and each having an inner end; a piston shoe connected to the inner end of each piston in sliding engagement with said eccentric portion of said shaft; a plurality of cylinder sleeves, each surrounding one of said pistons for free sliding movement relative thereto, each of said cylinder sleeves having a radially outer end; a stationary member for each of said cylinder sleeves and having an inwardly directed part-spherical surface, a portion of which being engaged and surrounded by the radially outer end of the respective cylinder sleeve; biasing means biasing each of said cylinder sleeves into engagement with said part-spherical surface; inlet and outlet valve means in each member at the respective portion of said part-spherical surface which is surrounded by said outer end of the respective cylinder sleeve, said inlet valve means comprising a valve member located within said
  • said housing has two sections surrounding said member and having a pair of oppositely located recesses; said member having a pair of oppositely located outwardly extending projections each of which is matingly received in one of said recesses.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US480503A 1973-06-29 1974-06-18 Radial piston machine Expired - Lifetime US3912421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732333103 DE2333103A1 (de) 1973-06-29 1973-06-29 Radialkolbenmaschine

Publications (1)

Publication Number Publication Date
US3912421A true US3912421A (en) 1975-10-14

Family

ID=5885452

Family Applications (1)

Application Number Title Priority Date Filing Date
US480503A Expired - Lifetime US3912421A (en) 1973-06-29 1974-06-18 Radial piston machine

Country Status (3)

Country Link
US (1) US3912421A (ja)
JP (1) JPS5028005A (ja)
DE (1) DE2333103A1 (ja)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4105371A (en) * 1976-10-15 1978-08-08 General Motors Corporation Cam driven compressor
US4222714A (en) * 1977-04-16 1980-09-16 Rexroth Gmbh Radial piston pump
US4277228A (en) * 1976-05-18 1981-07-07 G. L. Rexroth Gmbh Radial piston pump
US4621982A (en) * 1983-06-18 1986-11-11 Vickers System Gmbh Double pump
US5358383A (en) * 1992-04-27 1994-10-25 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Radial-piston pump for internal combustion engine fuel
US6450788B1 (en) * 1998-10-17 2002-09-17 Robert Bosch Gmbh Piston pump for high-pressure fuel delivery
US6457957B1 (en) * 1998-10-17 2002-10-01 Bosch Gmbh Robert Radial piston pump for generating high fuel pressure
US6792968B1 (en) * 2000-05-30 2004-09-21 Robert H. Breeden Pump assembly and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716888C3 (de) * 1977-04-16 1985-08-22 Mannesmann Rexroth GmbH, 8770 Lohr Hydrostatische Radialkolbenpumpe
JPS56163553A (en) * 1980-05-19 1981-12-16 Mitsubishi Electric Corp Cassette tape recorder
DE3504163A1 (de) * 1985-02-07 1986-08-14 Fritz 5600 Wuppertal Stumpmeier Radialkolbenverstellpumpe mit digitaler foerderstromverstellung
DE3740891A1 (de) * 1987-12-02 1989-06-22 Pleiger Maschf Paul Radialkolbenmotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1990703A (en) * 1933-06-02 1935-02-12 Ewart J Liddle Engine
US2642748A (en) * 1949-01-15 1953-06-23 Schweizerische Lokomotiv Mechanical movement in hydraulic motors
US3227094A (en) * 1962-06-28 1966-01-04 Promecan Ets High pressure hydraulic pumps
US3527547A (en) * 1967-03-15 1970-09-08 Rexroth Gmbh G L Radial piston pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4120701Y1 (ja) * 1965-01-12 1966-10-06

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1990703A (en) * 1933-06-02 1935-02-12 Ewart J Liddle Engine
US2642748A (en) * 1949-01-15 1953-06-23 Schweizerische Lokomotiv Mechanical movement in hydraulic motors
US3227094A (en) * 1962-06-28 1966-01-04 Promecan Ets High pressure hydraulic pumps
US3527547A (en) * 1967-03-15 1970-09-08 Rexroth Gmbh G L Radial piston pump

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4277228A (en) * 1976-05-18 1981-07-07 G. L. Rexroth Gmbh Radial piston pump
US4105371A (en) * 1976-10-15 1978-08-08 General Motors Corporation Cam driven compressor
US4222714A (en) * 1977-04-16 1980-09-16 Rexroth Gmbh Radial piston pump
US4621982A (en) * 1983-06-18 1986-11-11 Vickers System Gmbh Double pump
US5358383A (en) * 1992-04-27 1994-10-25 Elasis Sistema Ricerca Fiat Nel Mezzogiorno Radial-piston pump for internal combustion engine fuel
US6450788B1 (en) * 1998-10-17 2002-09-17 Robert Bosch Gmbh Piston pump for high-pressure fuel delivery
US6457957B1 (en) * 1998-10-17 2002-10-01 Bosch Gmbh Robert Radial piston pump for generating high fuel pressure
US6792968B1 (en) * 2000-05-30 2004-09-21 Robert H. Breeden Pump assembly and method

Also Published As

Publication number Publication date
DE2333103A1 (de) 1975-01-16
JPS5028005A (ja) 1975-03-22

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