EP0046691A2 - Improvements in and relating to hydraulic motors - Google Patents
Improvements in and relating to hydraulic motors Download PDFInfo
- Publication number
- EP0046691A2 EP0046691A2 EP81303879A EP81303879A EP0046691A2 EP 0046691 A2 EP0046691 A2 EP 0046691A2 EP 81303879 A EP81303879 A EP 81303879A EP 81303879 A EP81303879 A EP 81303879A EP 0046691 A2 EP0046691 A2 EP 0046691A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- piston
- roller
- motor
- recesses
- 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- Withdrawn
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Classifications
-
- 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
- F03C1/22—Reciprocating-piston liquid engines with movable cylinders or cylinder
- F03C1/24—Reciprocating-piston liquid engines with movable cylinders or cylinder in which the liquid exclusively displaces one or more pistons reciprocating in rotary 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
- F03C1/0428—Supporting and guiding means for the pistons
Definitions
- This invention concerns improvements in and relating to hydraulic motors, and more especially to hydraulic motors of the kind comprising a rotor incorporating a plurality of radial cylinders, and an outer casing provided'with a circumferential cam track surrounding the periphery of said rotor, each cylinder of the rotor containing a piston having a cam follower for engagement with said cam track, and valve means being provided for supplying pressure fluid to and exhausting it from each of the cylinders of said rotor in timed relation to the rotary movement thereof, whereby during the working cycle of each piston and cylinder, the piston is driven outwardly under fluid pressure, in order, via said cam follower and cam track, to cause relative rotary motion of said rotor and casing, and is then returned by way of said cam track and cam follower to exhaust fluid from the cylinder.
- Hydraulic motors of the above kind are well known, and are particularly suitable for the transmission of high torque at relatively low speed, such as is required, for example, in the case of wheel motors for heavy duty vehicles.
- cam followers for transmitting forces between the pistons and the peripheral cam track surrounding the rotor.
- the cam followers are generally in the form of rolling members such as balls or rollers.
- Ball-shaped cam followers have the disadvantage that the peripheral cam track is required to be of relatively complicated shape, and is correspondingly expensive to manufacture, as are the ball-seatings in the pistons.
- cam followers in the shape of rollers have the advantage that a cam of flat transverse profile can be used, with correspondingly reduced friction in the area of contact between the cam and the cam follower. They have the corresponding disadvantage, however, that they need to be maintained accurately in alignment with the axis of the rotor, thus requiring additional guide means for this purpose.
- roller cam followers In one prior proposal utilising roller cam followers, the rollers have an axial length which is less than the diameter of the corresponding pistons, the rollers being retained captive within the pistons and penetrating into the cylinders of the rotor together therewith.
- Guide means making sliding contact with the end faces of the rollers are provided on the motor casing at the lateral boundaries of the cam track, in order to maintain the rollers in alignment with the axis of the rotor.
- Such an arrangement has the disadvantage that the axial length of the rollers, and thus the area of contact with the cam track is relatively small.
- the area of contact between the guide means and the end faces of the cam followers is necessarily reduced as the rollers penetrate the cylinders of the rotor to approach the rotary axis thereof.
- each cam follower comprises a roller rotatably mounted within the corresponding piston with its rotary axis in alignment with the rotary axis of the rotor, characterised in that the axial length of each roller is approximately the same as the diameter of the piston within which it is located, that each cylinder of the rotor has lateral recesses to receive the axial ends of the roller mounted within the corresponding piston, that said rotor is further provided with guide means bounding said lateral recesses of the cylinder, and that the end faces of each cam follower roller are arranged to make sliding engagement with said guide means whereby the roller is maintained in axial alignment with the rotary axis of the rotor.
- the arrangement in accordance with the invention has the advantage that since the guide means for the cam follower rollers are mounted on the rotor, rather than on the motor casing, there is less sliding friction between the guide means and the end faces of the cam follower rollers, with correspondingly lower wear and frictional losses. Moreover, the axial length of the cam follower rollers can be greater than in hitherto known constructions in which the cam followers are arranged to penetrate the cylindrical recesses of the rotor.
- the axial ends of said rotor have circumferential recesses at the outer periphery of the rotor to define a central portion of generally cylindrical configuration, said central portion containing the outermost portions of said radial -cylinders, the axial dimension of said central portion corresponding substantially to the diameter of said radial cylinders, and said central portion being provided with a plurality of open-ended axially extending grooves or slots extending across the said outermost portions of said radial cylinders to define the above-mentioned lateral recesses.
- This configuration of the rotor essentially simplifies the machining operations required to form the rotor, and enables the guide means to be formed in a simple manner as a pair of annular guide rings located in the said circumferential recesses to close the open ends of said transverse grooves or slots in the rotor.
- the said guide rings are held in place in said circumferential recesses by means of axially extending clamping bolts arranged to extend through bores in the said rotor at positions between the said radial cylinders.
- the said pistons are preferably provided with diametrically opposed, recessed faces on their sides adjacent the axial ends of said rollers.
- An effective seal between the piston and the walls of its corresponding radial cylinder may be maintained by providing a sealing ring adjacent the inner end of the piston, at a point spaced from the recessed faces of the piston.
- a motor in accordance with one embodiment of the invention comprises a rotor 1, mounted for rotation within an outer casing 2 by means of bearings 3.
- the rotor 1 comprises a plurality of radial cylindrical recesses 4, within each of which is located a corresponding piston 5.
- Each piston 5 has a peripheral piston ring 6 in sealing engagement with the wall of the cylinder 4.
- the outer casing 2 incorporates a peripheral cam track 7, the annular profile of which is shown in Figure 2.
- Each of the pistons 5 contains a cam follower roller 8 which is held captive within a part cylindrical recess 5A of the piston, the recess 5A extending over an arc of a cylinder which subtends slightly more than 180 0 , such that the roller 8 is retained against outward displacement from the piston 5.
- the cam followers 8 are relatively rotatable within the recesses 5A, which may be lined with an anti-frictional material such as an appropriate synthetic plastics material.
- the pistons 5 are spring loaded in an outward direction by means of cylindrical compression springs 9 held in locating bores 1A and 5B of the rotor and piston respectively, such that in the idle condition and in the absence of hydraulic forces acting in the cylinders 4, the rollers 8 are held lightly in engagement with the periphery of the cam track 7.
- the cam follower rollers 8 are located with their rotary axes in alignment with the rotary axis of the rotor 1, by means of guide rings 10 which are located in corresponding circumferential recesses 1B in the axial ends of that portion of the rotor 1 containing the cylinders 4, the cylindrical walls of the cylinders 4 also having transverse slots 4A to receive the axial ends of the cam follower rollers 8, which are of substantially the same axial length as the pistons 5.
- the guide rings 10 are located in position by means of securing bolts 11 passing through apertures 1C in the central portion of the rotor 1 between the cylinders 4, as can be seen more clearly by reference to Figures 2 and 3.
- the distance between the guide rings 10 corresponds substantially to the diameter of the cylinders 4, and the portions of the pistons 5 adjacent the axial ends of the rotor 1 are recessed as shown at 5C, in order to provide a clearance between the pistons 5 and the guide rings 10.
- the motor casing 2 is provided with hydraulic supply and return conduits 12 and 13, which communicate with annular channels 14 and 15 defined between the motor casing 2 and an annular valve insert 16.
- the valve insert 16 is axially slidable within the motor casing 2, being spring urged to the left, as viewed in Figure 1, by means of a series of compression springs 17 located within bores 16A of the valve insert.
- the springs 17 maintain the position of the valve insert 16 during start up or reversal of the motor until the hydraulic pressure loading on the stepped portions of the valve insert is established.
- the valve insert is held against rotation within the valve casing by means of a peg 18.
- the conduits 20, 21 and the ports 20A and 21A are arranged in alternation around the circumference of the valve insert 16, as shown more clearly in Figure 3.
- each piston 15 is alternately driven outwardly towards the cam track 7 by hydraulic fluid supplied under pressure through the conduit 20, and returned towards the rotor axis by the cam track 7 to discharge hydraulic fluid through the exhaust conduits 21. It will be appreciated that by reversing the supply of hydraulic fluid to the ports 12 and 13, the direction of rotation of the hydraulic motor may be reversed.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Motors (AREA)
Abstract
In a hydraulic motor of the kind comprising radial pistons (5) having cam followers (8) for engagement with a circumferential cam track, the cam followers (8) comprise rollers of which the axial length substantially corresponds to the diameter of the pistons (5), and the cylinders (4) of the motor are provided with radial recesses (4A) to accommodate the axial ends of the cam follower rollers (8). Guide means (10) for the end faces of the cam follower rollers (8) are provided at the ends of the recesses (4A). The recesses (4A) may comprise transverse slots in the rotor (1), the latter being recessed to receive two axial end rings (10) providing the guide means for the end faces of the cam follower rollers (8).
Description
- This invention concerns improvements in and relating to hydraulic motors, and more especially to hydraulic motors of the kind comprising a rotor incorporating a plurality of radial cylinders, and an outer casing provided'with a circumferential cam track surrounding the periphery of said rotor, each cylinder of the rotor containing a piston having a cam follower for engagement with said cam track, and valve means being provided for supplying pressure fluid to and exhausting it from each of the cylinders of said rotor in timed relation to the rotary movement thereof, whereby during the working cycle of each piston and cylinder, the piston is driven outwardly under fluid pressure, in order, via said cam follower and cam track, to cause relative rotary motion of said rotor and casing, and is then returned by way of said cam track and cam follower to exhaust fluid from the cylinder.
- Hydraulic motors of the above kind are well known, and are particularly suitable for the transmission of high torque at relatively low speed, such as is required, for example, in the case of wheel motors for heavy duty vehicles.
- Known motors of the above type have drawbacks as regards the construction and arrangement of the cam followers for transmitting forces between the pistons and the peripheral cam track surrounding the rotor. The cam followers are generally in the form of rolling members such as balls or rollers. Ball-shaped cam followers have the disadvantage that the peripheral cam track is required to be of relatively complicated shape, and is correspondingly expensive to manufacture, as are the ball-seatings in the pistons. In comparison, cam followers in the shape of rollers have the advantage that a cam of flat transverse profile can be used, with correspondingly reduced friction in the area of contact between the cam and the cam follower. They have the corresponding disadvantage, however, that they need to be maintained accurately in alignment with the axis of the rotor, thus requiring additional guide means for this purpose.
- In one prior proposal utilising roller cam followers, the rollers have an axial length which is less than the diameter of the corresponding pistons, the rollers being retained captive within the pistons and penetrating into the cylinders of the rotor together therewith. Guide means making sliding contact with the end faces of the rollers are provided on the motor casing at the lateral boundaries of the cam track, in order to maintain the rollers in alignment with the axis of the rotor. Such an arrangement, however, has the disadvantage that the axial length of the rollers, and thus the area of contact with the cam track is relatively small. Moreover, the area of contact between the guide means and the end faces of the cam followers is necessarily reduced as the rollers penetrate the cylinders of the rotor to approach the rotary axis thereof.
- It is accordingly an object of the present invention to provide a hydraulic motor of the general type referred to above, wherein the pistons are provided with cam followers in the form of rollers, and wherein improved guide means for the cam follower rollers is provided.
- The present invention accordingly provides a hydraulic motor of the kind initially referred to, wherein each cam follower comprises a roller rotatably mounted within the corresponding piston with its rotary axis in alignment with the rotary axis of the rotor, characterised in that the axial length of each roller is approximately the same as the diameter of the piston within which it is located, that each cylinder of the rotor has lateral recesses to receive the axial ends of the roller mounted within the corresponding piston, that said rotor is further provided with guide means bounding said lateral recesses of the cylinder, and that the end faces of each cam follower roller are arranged to make sliding engagement with said guide means whereby the roller is maintained in axial alignment with the rotary axis of the rotor.
- The arrangement in accordance with the invention has the advantage that since the guide means for the cam follower rollers are mounted on the rotor, rather than on the motor casing, there is less sliding friction between the guide means and the end faces of the cam follower rollers, with correspondingly lower wear and frictional losses. Moreover, the axial length of the cam follower rollers can be greater than in hitherto known constructions in which the cam followers are arranged to penetrate the cylindrical recesses of the rotor.
- In accordance with a particularly advantageous embodiment of the invention, the axial ends of said rotor have circumferential recesses at the outer periphery of the rotor to define a central portion of generally cylindrical configuration, said central portion containing the outermost portions of said radial -cylinders, the axial dimension of said central portion corresponding substantially to the diameter of said radial cylinders, and said central portion being provided with a plurality of open-ended axially extending grooves or slots extending across the said outermost portions of said radial cylinders to define the above-mentioned lateral recesses. This configuration of the rotor essentially simplifies the machining operations required to form the rotor, and enables the guide means to be formed in a simple manner as a pair of annular guide rings located in the said circumferential recesses to close the open ends of said transverse grooves or slots in the rotor. Preferably, the said guide rings are held in place in said circumferential recesses by means of axially extending clamping bolts arranged to extend through bores in the said rotor at positions between the said radial cylinders.
- In order to avoid contact between the said pistons and the guide means for the cam follower rollers, the said pistons are preferably provided with diametrically opposed, recessed faces on their sides adjacent the axial ends of said rollers. An effective seal between the piston and the walls of its corresponding radial cylinder may be maintained by providing a sealing ring adjacent the inner end of the piston, at a point spaced from the recessed faces of the piston.
- The invention is illustrated by way of example in the accompanying drawings, in which:
- Figure 1 is a sectional elevation of a hydraulic motor in accordance with the invention,
- Figure 2 is a cross-section on the line II-II of Figure 1,
- Figure 3 is an exploded perspective view of the rotor and piston assembly of the motor of Figure 1,
- Figure 4 is a view of the valve face of the motor shown in Figure 1, on the line IV-IV, and
- Figure 5 is an end view of the motor shown in Figure 1, in the direction of the arrow X.
- Referring to the drawings, a motor in accordance with one embodiment of the invention comprises a
rotor 1, mounted for rotation within anouter casing 2 by means ofbearings 3. Therotor 1 comprises a plurality of radialcylindrical recesses 4, within each of which is located acorresponding piston 5. Eachpiston 5 has a peripheral piston ring 6 in sealing engagement with the wall of thecylinder 4. Theouter casing 2 incorporates aperipheral cam track 7, the annular profile of which is shown in Figure 2. Each of thepistons 5 contains acam follower roller 8 which is held captive within a part cylindrical recess 5A of the piston, the recess 5A extending over an arc of a cylinder which subtends slightly more than 1800, such that theroller 8 is retained against outward displacement from thepiston 5. Thecam followers 8 are relatively rotatable within the recesses 5A, which may be lined with an anti-frictional material such as an appropriate synthetic plastics material. Thepistons 5 are spring loaded in an outward direction by means ofcylindrical compression springs 9 held in locating bores 1A and 5B of the rotor and piston respectively, such that in the idle condition and in the absence of hydraulic forces acting in thecylinders 4, therollers 8 are held lightly in engagement with the periphery of thecam track 7. - The
cam follower rollers 8 are located with their rotary axes in alignment with the rotary axis of therotor 1, by means ofguide rings 10 which are located in correspondingcircumferential recesses 1B in the axial ends of that portion of therotor 1 containing thecylinders 4, the cylindrical walls of thecylinders 4 also havingtransverse slots 4A to receive the axial ends of thecam follower rollers 8, which are of substantially the same axial length as thepistons 5. Theguide rings 10 are located in position by means of securingbolts 11 passing through apertures 1C in the central portion of therotor 1 between thecylinders 4, as can be seen more clearly by reference to Figures 2 and 3. The distance between theguide rings 10 corresponds substantially to the diameter of thecylinders 4, and the portions of thepistons 5 adjacent the axial ends of therotor 1 are recessed as shown at 5C, in order to provide a clearance between thepistons 5 and theguide rings 10. - Referring to Figures 1 and 4, the
motor casing 2 is provided with hydraulic supply andreturn conduits annular channels 14 and 15 defined between themotor casing 2 and anannular valve insert 16. Thevalve insert 16 is axially slidable within themotor casing 2, being spring urged to the left, as viewed in Figure 1, by means of a series ofcompression springs 17 located withinbores 16A of the valve insert. Thesprings 17 maintain the position of the valve insert 16 during start up or reversal of the motor until the hydraulic pressure loading on the stepped portions of the valve insert is established. The valve insert is held against rotation within the valve casing by means of apeg 18. An end face 16B at the left-hand axial end of thevalve insert 16, as viewed in Figure 1, makes sliding engagement with a corresponding end face 1D of therotor 1, whereby, during rotation of therotor 1,hydraulic conduits 19 formed in therotor 1 and communicating with thecylinders 4, are respectively placed in communication with corresponding hydraulic supply andreturn conduits valve insert 16, theducts arcuate ports insert 16, and with theannular channels 14 and 15. Theconduits ports valve insert 16, as shown more clearly in Figure 3. Thus, eachpiston 15 is alternately driven outwardly towards thecam track 7 by hydraulic fluid supplied under pressure through theconduit 20, and returned towards the rotor axis by thecam track 7 to discharge hydraulic fluid through theexhaust conduits 21. It will be appreciated that by reversing the supply of hydraulic fluid to theports - From the above description it will be seen that there has been provided a novel construction of hydraulic motor, wherein the transmission of forces between the pistons of the motor and the outer peripheral cam track is effected by means of cam follower rollers, the cam follower rollers being reliably guided to maintain their axes in alignment with the rotor axis, by guide means so constructed and arranged that the cam follower rollers may be of increased axial length, whilst the friction between the end faces of the cam follower rollers and the guide means is reduced.
Claims (6)
1. A hydraulic motor comprising a rotor incorporating a plurality of radial cylinders, an outer casing provided with a circumferential cam track surrounding the periphery of said rotor, each cylinder of the rotor containing a piston having a cam follower in the form of a roller rotatably mounted within the piston with its rotary axis in alignment with the rotary axis of the rotor, the roller being arranged to engage said cam track, and valve means for supplying pressure fluid to and exhausting it from each of the cylinders of the roller in timed relation to the rotary movement thereof, characterised in that the axial length of each roller (8) is approximately the same as the diameter of the piston (5) within which it is located, that each cylinder (4) of the rotor has lateral recesses (4A) to receive the axial ends of the roller (8) mounted within the corresponding piston (5), that said rotor (1) is further provided with guide means (10) bounding said lateral recesses (4A) of the cylinder, and that the end faces of each cam follower roller are arranged to make sliding engagement with said guide means (10) whereby the roller (8) is maintained in axial alignment with the rotary axis of the rotor.
2. A motor as claimed in Claim 1, characterised in that the axial ends of said rotor (1) have circumferential recesses (1B) at the outer periphery of the rotor to define a central portion of generally cylindrical configuration, said central portion containing the outermost portions of said radial cylinders (4), that the axial dimension of said central portion substantially corresponds to the diameter of said radial cylinders (4), that said central portion contains a plurality of open ended axially extending grooves or slots (4A) extending across the outermost portions of said radial cylinders (4) to define said lateral recesses and that the said guide means (10) comprise a pair of annular guide rings located in said circumferential recesses to close the open ends of said grooves or slots (4A).
3. A motor as claimed in Claim 2, characterised in that the said guide rings (10) are held in place in said circumferential recesses (1B) by axially extending clamping bolts (11) extending through bores (1C) located in said rotor between the said radial cylinders (4).
4. A motor as claimed in any one of Claims 1 - 3, characterised in that the said pistons (5) are provided with diametrically opposed, recessed faces (5C) on their sides adjacent the axial ends of said rollers (8), whereby said pistons remain out of contact with said guide means (10).
5. A motor as claimed in Claim 4, characterised in that each piston incorporates a sealing ring (6) adjacent its inner end, said sealing ring being spaced from said recessed faces (5C) of the piston.
6. A motor as claimed in any one of Claims 1 - 5, characterised in that the said outer casing (2) is formed in two portions between which is clamped a portion defining the said cam track (7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8027617A GB2086991A (en) | 1980-08-26 | 1980-08-26 | Improvements in and relating to hydraulic motors |
GB8027617 | 1980-08-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0046691A2 true EP0046691A2 (en) | 1982-03-03 |
EP0046691A3 EP0046691A3 (en) | 1982-03-31 |
Family
ID=10515655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81303879A Withdrawn EP0046691A3 (en) | 1980-08-26 | 1981-08-25 | Improvements in and relating to hydraulic motors |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0046691A3 (en) |
JP (1) | JPS57119173A (en) |
GB (1) | GB2086991A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2586752A1 (en) * | 1985-09-05 | 1987-03-06 | Rexroth Mannesmann Gmbh | RADIAL PISTON MACHINE WITH REDUCED CONTACT VOLTAGES |
FR2651836A1 (en) * | 1989-09-14 | 1991-03-15 | Poclain Hydraulics Sa | MECHANISM, MOTOR OR PUMP, WITH PISTONS SUPPORTING SUPPORT ROLLS OF SAID PISTONS ON A CAM. |
FR2658869A1 (en) * | 1990-02-16 | 1991-08-30 | Rexroth Mannesmann Gmbh | RADIAL PISTON MACHINE AND MANUFACTURING METHOD THEREOF. |
EP0931932A3 (en) * | 1993-04-21 | 1999-09-22 | ZF FRIEDRICHSHAFEN Aktiengesellschaft | Hydrostatic-mechanical drive for a concrete mixer |
WO1999046504A3 (en) * | 1998-03-10 | 1999-12-09 | Mannesmann Rexroth Ag | Radial piston engine with guide rollers |
WO2000005502A1 (en) * | 1998-07-21 | 2000-02-03 | Mannesmann Rexroth Ag | Radial piston engine with roller guides |
EP1785622A1 (en) * | 2005-11-15 | 2007-05-16 | Weber-Hydraulik GmbH | Hydraulic pump |
FR3010744A1 (en) * | 2013-09-16 | 2015-03-20 | Poclain Hydraulics Ind | IMPROVED CYLINDER BLOCK FOR HYDRAULIC MACHINE HAVING OPTIMIZED RADIAL SIZE |
WO2018090159A1 (en) * | 2016-11-18 | 2018-05-24 | 秦皇岛正时乐液压设备有限公司 | Internally curved low-speed high-torque hydraulic motor with torque being output by means of rotation of housing |
CN108301964A (en) * | 2018-04-04 | 2018-07-20 | 上海波赫驱动***有限公司 | A kind of inner curve radial plunger type motor rotor assembly |
CN110242353A (en) * | 2019-07-17 | 2019-09-17 | 顾新钿 | A kind of air motor |
FR3136519A1 (en) * | 2022-06-13 | 2023-12-15 | Poclain Hydraulics Industrie | Enhanced Flow Hydraulic Machine |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE456517B (en) * | 1982-09-08 | 1988-10-10 | Hegglund & Soner Ab | HYDRAULIC RADIAL PISTON ENGINE |
FI73789C (en) * | 1983-12-07 | 1987-11-09 | Partek Ab | HYDRAULISK MOTOR. |
JPH0776077B2 (en) * | 1992-10-21 | 1995-08-16 | 株式会社川崎機械製作所 | Hydraulic motor for winding and unwinding drive of wire rope and driving method |
CN102493913B (en) * | 2011-12-13 | 2015-05-13 | 宁波德辰液压科技有限公司 | Shell turn type inner-curve radial plunger hydraulic motor |
KR101811422B1 (en) * | 2016-10-20 | 2017-12-21 | 박영선 | Fluid Motor |
Citations (7)
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---|---|---|---|---|
GB164180A (en) * | 1920-03-24 | 1921-06-09 | Harry Ralph Ricardo | Improvements in or relating to rotary pumps or compressors |
GB187227A (en) * | 1921-10-12 | 1923-12-27 | Wladimir De Wasmundt | Improvements in tangential cylinder engines |
GB1220146A (en) * | 1968-07-19 | 1971-01-20 | Davy & United Eng Co Ltd | Hydraulic motor |
FR2196674A5 (en) * | 1972-08-16 | 1974-03-15 | Newage Engineers Ltd | |
DE2332580A1 (en) * | 1973-06-27 | 1975-01-02 | Wepuko Hydraulik Gmbh | Hydraulic radial piston pump - has piston plunger guided in gudgeon pin sliding in shoes |
GB1391592A (en) * | 1971-05-19 | 1975-04-23 | Contractors Plant London Midla | Fluidpressure eg hydraulic motors |
FR2368619A1 (en) * | 1976-10-21 | 1978-05-19 | Automotive Prod Co Ltd | Hydrostatic cam and piston assembly - has ball pressed against recess wall to form sealed joint |
-
1980
- 1980-08-26 GB GB8027617A patent/GB2086991A/en not_active Withdrawn
-
1981
- 1981-08-25 EP EP81303879A patent/EP0046691A3/en not_active Withdrawn
- 1981-08-26 JP JP13394681A patent/JPS57119173A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB164180A (en) * | 1920-03-24 | 1921-06-09 | Harry Ralph Ricardo | Improvements in or relating to rotary pumps or compressors |
GB187227A (en) * | 1921-10-12 | 1923-12-27 | Wladimir De Wasmundt | Improvements in tangential cylinder engines |
GB1220146A (en) * | 1968-07-19 | 1971-01-20 | Davy & United Eng Co Ltd | Hydraulic motor |
GB1391592A (en) * | 1971-05-19 | 1975-04-23 | Contractors Plant London Midla | Fluidpressure eg hydraulic motors |
FR2196674A5 (en) * | 1972-08-16 | 1974-03-15 | Newage Engineers Ltd | |
DE2332580A1 (en) * | 1973-06-27 | 1975-01-02 | Wepuko Hydraulik Gmbh | Hydraulic radial piston pump - has piston plunger guided in gudgeon pin sliding in shoes |
FR2368619A1 (en) * | 1976-10-21 | 1978-05-19 | Automotive Prod Co Ltd | Hydrostatic cam and piston assembly - has ball pressed against recess wall to form sealed joint |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2180011A (en) * | 1985-09-05 | 1987-03-18 | Rexroth Mannesmann Gmbh | Radial piston engine |
FR2586752A1 (en) * | 1985-09-05 | 1987-03-06 | Rexroth Mannesmann Gmbh | RADIAL PISTON MACHINE WITH REDUCED CONTACT VOLTAGES |
FR2651836A1 (en) * | 1989-09-14 | 1991-03-15 | Poclain Hydraulics Sa | MECHANISM, MOTOR OR PUMP, WITH PISTONS SUPPORTING SUPPORT ROLLS OF SAID PISTONS ON A CAM. |
US5081906A (en) * | 1989-09-14 | 1992-01-21 | Poclain Hydraulics | Mechanism, motor pump, incorporating pistons supporting, rollers for abutment of said pistons on a cam |
FR2658869A1 (en) * | 1990-02-16 | 1991-08-30 | Rexroth Mannesmann Gmbh | RADIAL PISTON MACHINE AND MANUFACTURING METHOD THEREOF. |
GB2241749A (en) * | 1990-02-16 | 1991-09-11 | Rexroth Mannesmann Gmbh | Radial piston engine |
US5179889A (en) * | 1990-02-16 | 1993-01-19 | Mannesmann Rexroth Gmbh | Radial piston engine |
GB2241749B (en) * | 1990-02-16 | 1994-11-16 | Rexroth Mannesmann Gmbh | Radial piston engine |
EP0931932A3 (en) * | 1993-04-21 | 1999-09-22 | ZF FRIEDRICHSHAFEN Aktiengesellschaft | Hydrostatic-mechanical drive for a concrete mixer |
US6494127B1 (en) | 1998-03-10 | 2002-12-17 | Mannesmann Rexroth Ag | Radial piston engine with guide rollers |
WO1999046504A3 (en) * | 1998-03-10 | 1999-12-09 | Mannesmann Rexroth Ag | Radial piston engine with guide rollers |
WO2000005502A1 (en) * | 1998-07-21 | 2000-02-03 | Mannesmann Rexroth Ag | Radial piston engine with roller guides |
US6443047B1 (en) | 1998-07-21 | 2002-09-03 | Bosch Rexroth Ag | Radial piston engine with roller guides |
EP1785622A1 (en) * | 2005-11-15 | 2007-05-16 | Weber-Hydraulik GmbH | Hydraulic pump |
FR3010744A1 (en) * | 2013-09-16 | 2015-03-20 | Poclain Hydraulics Ind | IMPROVED CYLINDER BLOCK FOR HYDRAULIC MACHINE HAVING OPTIMIZED RADIAL SIZE |
WO2018090159A1 (en) * | 2016-11-18 | 2018-05-24 | 秦皇岛正时乐液压设备有限公司 | Internally curved low-speed high-torque hydraulic motor with torque being output by means of rotation of housing |
CN108301964A (en) * | 2018-04-04 | 2018-07-20 | 上海波赫驱动***有限公司 | A kind of inner curve radial plunger type motor rotor assembly |
CN110242353A (en) * | 2019-07-17 | 2019-09-17 | 顾新钿 | A kind of air motor |
CN110242353B (en) * | 2019-07-17 | 2024-03-15 | 顾新钿 | Pneumatic motor |
FR3136519A1 (en) * | 2022-06-13 | 2023-12-15 | Poclain Hydraulics Industrie | Enhanced Flow Hydraulic Machine |
WO2023242502A1 (en) * | 2022-06-13 | 2023-12-21 | Poclain Hydraulics Industrie | Hydraulic machine with improved flow rate |
Also Published As
Publication number | Publication date |
---|---|
GB2086991A (en) | 1982-05-19 |
EP0046691A3 (en) | 1982-03-31 |
JPS57119173A (en) | 1982-07-24 |
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