EP0252715B1 - Radial piston fluid pressure pump or motor - Google Patents
Radial piston fluid pressure pump or motor Download PDFInfo
- 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
Links
Images
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.
Description
- This invention relates to a radial-piston type fluid pressure pump/motor. In a pump/motor of this type 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. In such constitution, due to the effects of working fluid at high pressure, 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.
- Conventionally, therefore, 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.
- However, in order to keep a high positioning precision at the spigot, machining of high precision is required, but when the precision is too high, it is hard to fit the two parts with each other. Besides, since the flange coupling part must be provided at the outer side of the spigot, the casing outside dimension increases, and it is hard to design compactly. In particular, when two sets of such fluid energy transducer are placed side by side, and one is used as the pump and the other as motor, that is, when composing a unitized HST or HMT system transmission by two fluid energy converters, the entire structure becomes very large due to the bulkiness in the direction of diameter of the both parts.
- 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.
- In accordance with the present invention there is provided 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.
- In such constitution, by screwing the cover having a helical taper plane having a same angle into the outer circumference or inner circumference of the opening end of the casing main body helically forming a taper plane, and tightening until the opening end of the casing main body abuts against the stopping plane, the taper plane of the casing main body rides on the taper plane of the cover in tight contact. As a result, the taper guide action is exhibited, and the cover and casing main body are positioned in specified state. Thus, in this state, the gap between the casing main body and cover in the radial direction is completely eliminated.
- Moreover, since these taper planes are slightly inclined at 45° or less with respect to the axial center, the taper plane of the cover will hardly slide along the taper plane of the casing main body if a load is applied in the radial direction. Accordingly, due to the effects of the fluid pressure, if a misaligning force should occur in the radial direction between the casing main body and cover, the two parts will never be dislocated.
- Besides, since the taper planes are formed helically 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.
- Therefore, in such construction, without using spigot and flange coupling part, 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.
- Referring now to Fig. 1 to Fig. 5, a preferable embodiment of this invention is described in details below.
- 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, atorque ring 4 possessing innerflat planes 3 respectively at the inside of the positions corresponding to plural firststatic pressure bearings 2 rotatably fitted relatively through saidstatic pressure bearings 2 provided on theinner circumference 1a of this casing,plural pistons 6 being disposed inside of thistorque ring 4 with its end fitted to said innerflat planes 3 through secondstatic pressure bearings 5, acylinder barrel 8 holding thesepistons 6 in a slidable manner and forming afree space 7 for entry and discharge of fluid in thesepistons 6, apintle 9 for rotatable supporting saidcylinder barrel 8 being disposed reciprocatably in the direction orthogonal to the axial center m of saidcasing 1 andtorque ring 4, andfluid passages space 7 of which volume is increased and with thespace 7 of which volume is decreased when thecasing 1 andtorque ring 4 are relatively rotated with the axial center n of this pintle deviated from the axial center m of the casing. In this setup, the fluid to fill up saidspaces 7 is led into corresponding first and second static pressure bearings by way of thefluid passages 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. - In this construction, thus, with the axial center n of
pintle 9 deviated from the rotation axial center m, when a high pressure fluid is supplied into thespace 7 existing in the right region A in Fig. 3, through, for example, thefirst fluid passage 11, a couple to rotate thetorque ring 4 in the direction of arrow S occurs in thistorque ring 4, and the function as a motor is exhibited. Or, when thistorque ring 4 is rotated in the direction of, for example, arrow R by an external force, the high pressure fluid is discharged from said first fluid passage (see arrow Q), so that the function as a pump is fulfilled. - The
casing 1 of such fluid energy converter is composed of a casingmain body 21, and arear cover 22 fitted to the opening end of this casing main body. The casingmain body 21 is shaped like a cup to accommodate saidtorque ring 4,piston 6, andcylinder barrel 8, and its rear end is opened. Ataper plane 23 is formed in the inner circumference of theopening end 21a of this casingmain body 1. This taper plane has an angle α of 45° or less with respect to the axial center m of this casingmain body 1, with a specified width, and it is formed helically. That is, thistaper plane 23 has a helical taper surface. Asteep slope 24 of a specified width is formed between the top edge and bottom edge of thistaper plane 23. - On the other hand, the
rear cover 22 is shaped like a disc to support thecylinder barrel 8 by way of thepintle 9, and it has atrapezoidal groove 22a in which thebase end part 9a of thepintle 9 is fitted slidable. Thisrear cover 22 has anannular stopping plane 25 for stopping theopening end 21b of the casingmain body 21, and acircular buging part 26 formed inside thisstopping plane 25. On the outside of this circular bulgingpart 26, there is aspiral taper plane 27 having the same angle as saidtaper plane 23. Thistaper plane 27 has the same angle α with respect to the axial center m of the casingmain body 21, with a specified width, and is formed helically in the same pitch as that of saidtaper plane 23. - In the
taper plane 27 forming area of thisrear cover 22, thetaper plane 23 forming area of thecasing 21 is tightened by screwing up to the positiontion where theopening end 21 is fixed on thestopping plane 25. - In this construction, due to the reaction force the casing
main body 21 receives from thestopping plane 25 of therear cover 22, thehelical taper plane 23 provided inside the casingmain body 21 rides over thetaper plane 27 of therear cover 22 to contact tightly. As a result, the tape guide action is exhibited, and the casingmain body 21 and rear cover are coupled in an accurately positioned state. - In this state, the gap in the radial direction between the casing
main body 21 andrear cover 22 is completely eliminated. Still more, since thesetaper planes main body 21, thetaper plane 23 of the casingmain body 21 will hardly slide along thetaper plane 27 of therear cover 22. Accordingly, if a relative misaligning force in the radial direction should be applied between the casingmain body 21 andrear cover 22, the both parts will not be dislocated from each other. That is, if having a steep helical plane at 45° or more with respect to the axial center, as in an ordinary screw, slipping of the parts along the helical plane may occur when a radial load is applied to cause dislocation easily, but when thetaper planes main body 21 andrear cover 22 will be accurately maintained. - Therefore, it is not necessary to form a spigot between the casing main body and rear cover to set the relative tolerance strictly as required in the prior art, and the machining may be facilitated and the difficulty of assembling will be solved spontaneously.
- In addition, since the casing
main body 21 can be positioned by abutting its openingend 21b against thestopping plane 25 of therear cover 22, the repeatability of positioning in the axial direction will be also excellent. - In this composition, furthermore, when the both
taper planes taper planes casing 1 may be reduced, so that the entire equipment may be designed compactly. Fig. 5 and Fig. 6 are explanatory drawings to clarify this effect more clearly. That is, in Fig. 5, beside the fluid energy converter I1 explained hereabove, another fluid energy converter I2 of the same constitution is disposed, and therear covers fluid energy converters second fluid passages communicating routes rear cover 22, thereby composing a liquid pressure transmission of so-called HST type. Thus, in such mode of use, when the junction of the casingmain bodies 21 andrear cover 22 of thefluid energy converters helical taper planes main bodies 21 of the fluid energy converters I1, I2 may be defined to an extremely small length. On the other hand, in the case of the prior art shown in Fig. 6, 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. In this invention, therefore, as compared with the conventional equipment, the outside diameter can be notably reduced, and the entire equipment may be reduced in size and weight. - In the embodiment described herein, the taper plane is formed inside the opening end of the casing main body, which is not, however, limitative. For example, 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.
Claims (1)
- A radial-piston type fluid pressure pump/motor having a casing main body (21) and a cover (22) to support the cylinder barrel, the cover being positioned and mounted on the main body, wherein a taper plane (23) is formed helically on the inner or outer circumference of the opening end (21a) of the casing main body, characterized in that the taper plane forms an angle (α) of 45° or less with respect to the central axis (m) 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 (25) on the cover against the opening of the main body.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP104403/86 | 1986-07-07 | ||
JP1986104403U JPH073023Y2 (en) | 1986-07-07 | 1986-07-07 | Fluid energy converter |
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 (en) |
JP (1) | JPH073023Y2 (en) |
KR (1) | KR910007262B1 (en) |
CN (1) | CN1012211B (en) |
DE (1) | DE3777262D1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3719990B2 (en) | 2002-02-15 | 2005-11-24 | 株式会社デンソー | Compressor |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2620736A (en) * | 1945-12-28 | 1952-12-09 | John W Overbeke | Fluid handling mechanism |
DE1608626B1 (en) * | 1963-12-10 | 1969-09-11 | Sigri Elektrographit Gmbh | Secured screw connection of two coal bodies |
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 |
-
1986
- 1986-07-07 JP JP1986104403U patent/JPH073023Y2/en not_active Expired - Lifetime
-
1987
- 1987-07-06 CN CN87104630A patent/CN1012211B/en not_active Expired
- 1987-07-07 KR KR1019870007211A patent/KR910007262B1/en not_active IP Right Cessation
- 1987-07-07 DE DE8787305988T patent/DE3777262D1/en not_active Expired - Fee Related
- 1987-07-07 EP EP87305988A patent/EP0252715B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0252715A2 (en) | 1988-01-13 |
DE3777262D1 (en) | 1992-04-16 |
CN87104630A (en) | 1988-02-03 |
KR910007262B1 (en) | 1991-09-24 |
JPS6310271U (en) | 1988-01-23 |
KR880001937A (en) | 1988-04-28 |
EP0252715A3 (en) | 1989-02-22 |
CN1012211B (en) | 1991-03-27 |
JPH073023Y2 (en) | 1995-01-30 |
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