EP0252715B1 - Radial piston fluid pressure pump or motor - Google Patents

Radial piston fluid pressure pump or motor Download PDF

Info

Publication number
EP0252715B1
EP0252715B1 EP87305988A EP87305988A EP0252715B1 EP 0252715 B1 EP0252715 B1 EP 0252715B1 EP 87305988 A EP87305988 A EP 87305988A EP 87305988 A EP87305988 A EP 87305988A EP 0252715 B1 EP0252715 B1 EP 0252715B1
Authority
EP
European Patent Office
Prior art keywords
main body
casing main
plane
cover
taper
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
EP87305988A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0252715A3 (en
EP0252715A2 (en
Inventor
Yasuo Kita
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.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
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 Shimadzu Corp filed Critical Shimadzu Corp
Publication of EP0252715A2 publication Critical patent/EP0252715A2/en
Publication of EP0252715A3 publication Critical patent/EP0252715A3/en
Application granted granted Critical
Publication of EP0252715B1 publication Critical patent/EP0252715B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F01B13/00—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion
    • F01B13/04—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion with more than one cylinder
    • F01B13/06—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion with more than one cylinder in star arrangement
    • F01B13/061—Reciprocating-piston machines or engines with rotating cylinders in order to obtain the reciprocating-piston motion with more than one cylinder in star arrangement the connection of the pistons with the actuated or actuating element being at the outer ends of the cylinders

Definitions

  • This invention relates to a radial-piston type fluid pressure pump/motor.
  • a rear cover is generally fitted to the opening end of its casing, and a cylinder barrel disposed within said casing is supported on this rear cover by way of an eccentric pintle.
  • a large misaligning force in the radial direction may occur between said casing main body and rear cover. What is more, smooth operation is spoiled unless the casing and the rear cover are coupled in a correctly positioned state.
  • a spigot was provided between the casing main body and the rear cover, and a flange coupling part was disposed at its outer side, and the two parts are accurately coupled together by placing a bolt or other fixing means in this flange coupling part.
  • U.S. Patent Specification No. 2 620 736 describes a radial piston pump/motor in which an end cover is fitted in a bore in a main casing and secured by a ring which is in screw-threaded engagement in the bore and holds a stop plane on the end cover in abutment against the main casing.
  • a radial-piston type fluid pressure pump/motor having a casing main body and a cover to support the cylinder barrel, the cover being positioned and mounted on the main body, wherein a taper plane is formed helically on the inner or outer circumference of the opening end of the casing main body, characterized in that the taper plane forms an angle of 45° or less with respect to the central axis of the helix and a helical taper plane at the same angle is formed on the cover for screwed engagement with the taper plane on the main body, limited by abutment of a stop plane on the cover against the opening of the main body.
  • the casing main body and cover may be coupled by a simple operation similar to screw fitting. Still more, by fitting the opening end of the casing main body on the stopping plane of the cover, the positioning of the two parts in the axial direction may be accurately achieved.
  • the casing main body and cover can be securely and accurately joined together.
  • Fig. 1 to Fig. 5 relate to an embodiment of this invention, in which Fig. 1 is a longitudinal sectional view, Fig. 2 is a sectional view of II-II in Fig. 1, Fig. 3 is a lateral sectional view, Fig. 4 is a partial sectional view showing a magnified view of arrow IV part in Fig. 1, and Fig. 5 is an explanatory diagram showing the mode of use.
  • Fig. 6 is an explanatory diagram corresponding to Fig. 5 to indicate a prior art.
  • the fluid energy converter shown in Fig. 1 to Fig. 3 has a structure as disclosed in the Japanese Laid-open Patent No. 58-77179. That is, this energy converter is a radial-piston pump/motor composed of casing 1, a torque ring 4 possessing inner flat planes 3 respectively at the inside of the positions corresponding to plural first static pressure bearings 2 rotatably fitted relatively through said static pressure bearings 2 provided on the inner circumference 1a of this casing, plural pistons 6 being disposed inside of this torque ring 4 with its end fitted to said inner flat planes 3 through second static pressure bearings 5, a cylinder barrel 8 holding these pistons 6 in a slidable manner and forming a free space 7 for entry and discharge of fluid in these pistons 6, a pintle 9 for rotatable supporting said cylinder barrel 8 being disposed reciprocatably in the direction orthogonal to the axial center m of said casing 1 and torque ring 4, and fluid passages 11, 12 forming a pair to communicate with the space 7 of which volume
  • the fluid to fill up said spaces 7 is led into corresponding first and second static pressure bearings by way of the fluid passages 13, 14, and it is designed to develop a couple in the torque ring 4 around the rotation axial center m by the static pressure of the fluid led into the first static pressure bearing 2 and the static pressure of the fluid led into the second static pressure bearing 5.
  • the casing 1 of such fluid energy converter is composed of a casing main body 21, and a rear cover 22 fitted to the opening end of this casing main body.
  • the casing main body 21 is shaped like a cup to accommodate said torque ring 4, piston 6, and cylinder barrel 8, and its rear end is opened.
  • a taper plane 23 is formed in the inner circumference of the opening end 21a of this casing main body 1.
  • This taper plane has an angle ⁇ of 45° or less with respect to the axial center m of this casing main body 1, with a specified width, and it is formed helically. That is, this taper plane 23 has a helical taper surface.
  • a steep slope 24 of a specified width is formed between the top edge and bottom edge of this taper plane 23.
  • the rear cover 22 is shaped like a disc to support the cylinder barrel 8 by way of the pintle 9, and it has a trapezoidal groove 22a in which the base end part 9a of the pintle 9 is fitted slidable.
  • This rear cover 22 has an annular stopping plane 25 for stopping the opening end 21b of the casing main body 21, and a circular buging part 26 formed inside this stopping plane 25.
  • This taper plane 27 has the same angle ⁇ with respect to the axial center m of the casing main body 21, with a specified width, and is formed helically in the same pitch as that of said taper plane 23.
  • the taper plane 23 forming area of the casing 21 is tightened by screwing up to the positiontion where the opening end 21 is fixed on the stopping plane 25.
  • the casing main body 21 can be positioned by abutting its opening end 21b against the stopping plane 25 of the rear cover 22, the repeatability of positioning in the axial direction will be also excellent.
  • first and second fluid passages 11, 12 of one fluid energy converter I1, and the first and second fluid passages (not shown) of the other fluid energy converter I2 are connected with each other by way of first and second communicating routes 28, 29 formed at both sides of the rear cover 22, thereby composing a liquid pressure transmission of so-called HST type.
  • first and second communicating routes 28, 29 formed at both sides of the rear cover 22, thereby composing a liquid pressure transmission of so-called HST type.
  • the casing main bodies a and rear covers b of the fluid energy coverters II1, II2 are positioned by the spigots c, and by placing bolts e into the flange connection parts d provided outside, the casing main bodies a and rear covers b are joined, which means it is difficult to reduce the spacing distance Lb between the two casing main bodies a.
  • the outside diameter can be notably reduced, and the entire equipment may be reduced in size and weight.
  • the taper plane is formed inside the opening end of the casing main body, which is not, however, limitative.
  • a spiral taper plane may be formed outside the casing main body, and a taper plane fitting with this taper plane may be formed inside the dent part provided in the rear cover.
  • the internal structure of the fluid energy transducer is not limited to the above constitution, and it may be also possible, for example, to apply an ordinary radial piston type pump/motor.
  • This invention having such organization, is intended to position and joint the casing main body and cover accurately, without requirement of high precision in machining or difficulty in assembling work, and if a large misaligning force in the radial direction is applied between the casing main body and cover, its posi- tioning state will not be spoiled, so that it is possible to present an excellent fluid energy converter reduced in both size and weight by spontaneously reducing the maximum outside diameter of the entire equipment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Hydraulic Motors (AREA)
  • Reciprocating Pumps (AREA)
  • Actuator (AREA)
EP87305988A 1986-07-07 1987-07-07 Radial piston fluid pressure pump or motor Expired - Lifetime EP0252715B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1986104403U JPH073023Y2 (ja) 1986-07-07 1986-07-07 流体エネルギ変換機
JP104403/86 1986-07-07

Publications (3)

Publication Number Publication Date
EP0252715A2 EP0252715A2 (en) 1988-01-13
EP0252715A3 EP0252715A3 (en) 1989-02-22
EP0252715B1 true EP0252715B1 (en) 1992-03-11

Family

ID=14379752

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87305988A Expired - Lifetime EP0252715B1 (en) 1986-07-07 1987-07-07 Radial piston fluid pressure pump or motor

Country Status (5)

Country Link
EP (1) EP0252715B1 (US20100012521A1-20100121-C00001.png)
JP (1) JPH073023Y2 (US20100012521A1-20100121-C00001.png)
KR (1) KR910007262B1 (US20100012521A1-20100121-C00001.png)
CN (1) CN1012211B (US20100012521A1-20100121-C00001.png)
DE (1) DE3777262D1 (US20100012521A1-20100121-C00001.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3719990B2 (ja) 2002-02-15 2005-11-24 株式会社デンソー 圧縮機

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2620736A (en) * 1945-12-28 1952-12-09 John W Overbeke Fluid handling mechanism
DE1608626B1 (de) * 1963-12-10 1969-09-11 Sigri Elektrographit Gmbh Gesicherte Schraubverbindung von zwei Kohlenkoerpern
CA1051329A (en) * 1975-10-08 1979-03-27 Horace D. Holmes Locking thread construction
US4307816A (en) * 1980-03-06 1981-12-29 Hersey Products, Inc. Meter closure

Also Published As

Publication number Publication date
EP0252715A3 (en) 1989-02-22
KR880001937A (ko) 1988-04-28
DE3777262D1 (de) 1992-04-16
JPS6310271U (US20100012521A1-20100121-C00001.png) 1988-01-23
KR910007262B1 (ko) 1991-09-24
CN87104630A (zh) 1988-02-03
EP0252715A2 (en) 1988-01-13
JPH073023Y2 (ja) 1995-01-30
CN1012211B (zh) 1991-03-27

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