US1984447A - Pump - Google Patents

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Publication number
US1984447A
US1984447A US656637A US65663733A US1984447A US 1984447 A US1984447 A US 1984447A US 656637 A US656637 A US 656637A US 65663733 A US65663733 A US 65663733A US 1984447 A US1984447 A US 1984447A
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Prior art keywords
impeller
disc
guide
casing
outlet
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Expired - Lifetime
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US656637A
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English (en)
Inventor
Wicha Alois
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EROSPHA Inc
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EROSPHA Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C9/00—Oscillating-piston machines or engines
    • F01C9/005—Oscillating-piston machines or engines the piston oscillating in the space, e.g. around a fixed point

Definitions

  • This invention relates to a fluid actuating device and particularly relates to pumps for liquids and gases and to compressors for gases and vapors and other similar apparatus.
  • An object of the present invention is toprovide a spherical engine and particularly a durable pump which may be operated directly from a rotating shaft to give a continuous feed and/or to exert a continuous suction, which will be compact, light in weight and relatively inexpensive and which will have very few parts and not require costly lubricating installations or be readily subject to disadjustments.
  • a fluid actuator or a pump which, although it is directly driven from a rotating shaft, has a very high mechanical efliciency and will have a metering action; which may be driven over a wide range of rotational speeds;
  • valves which will be devoid of valves; which may be readily reversed; and which will produce both a substantially continuous suction at its inlet and a substantially continuous pressure at its outlet, all without the use of complicated or auxiliary mechanical apparatus, such as air bells, resilient diaphragm devices, and so forth.
  • an altogether novel type of pump consisting of a casing, the interior chamber of which may take the form of a spherical section or segment with a peripheral spherical surface and hat or, conical side walls; an oscillating piston or impeller disc, the oscillating movement of which takes place both horizontally and vertically Within said casing about a fixed center; a drive shaft which has an eccentric driving hearing for the impeller disc caming said impeller to undergo said movement within the casing resulting in substantially, continuous movement of fluid from the inlet to the outlet; and a guide member mounted in said casing and received'in a slot or socket in one edge of the impeller disc preventing the impeller disc from rotating while permitting relative pivotal and sliding movement whereby said impeller will partake of said oscillating movement both laterally and vertically.
  • the impeller disc the sides of which may be flat or outwardly converging or diverging, closely conforms to the spherical interior surface of the interior chamber along its entire periphery.
  • the interior chamber will be symmetrically divided into two compartments which will be separated from each other by the impeller.
  • the oscillating movement of the disc will continuously rotate these compartments within the casing.
  • the guide member is positioned between the inlet and outlet ports of the pump and constructed or associated with other elements, so as to prevent direct communication therebetween. As the compartments pass across the guide member, they will be divided thereby. During this passage they will decrease in volume on the approach or outlet side of the guide member, compressing and/or expelling fluid through the outlet port; and at the same time they will increase in volume on the removal or inlet side of the guide member, sucking fluid in through the inlet port.
  • a compartment After a compartment has passed entirely across the guide toward the inlet and has been filled with fluid or liquid, it'will be cut off from the inlet by the close adjuxtaposition between the side of the impeller disc and the side Wall of the interior chamber. After cut-off from the inlet and before being opened to the outlet, the compartment will not be divided by the guide member. Continued movement will then open the compartment to the outlet and it will remain in communication with such outlet until it has passed onto the other side of the guide member.
  • This guide member which, as stated before, preferably projects into a slot or socket formed in the impeller disc has a constant sliding and/or rolling contact in respect to impeller disc and considerable friction and strain may be engenr stantially eliminate undesirable acceleration and deceleration of the impeller masses during operation of the pump.
  • This guide element in one embodiment may take the form of a fragment of an annular spherical section. In another embodiment it may take the form of a truncated cone.
  • a guide member taking the form of a. truncated cone is utilized, a section or sections of an annular plate are utilized in conjunction with the guide member to prevent communication from the inlet to the outlet except through the rotating compartments.
  • Figs. 1 to 22 relate to one embodiment, Fig. 1 being a front sectional view upon the line 1*1 of Fig. 2; Fig. 2 being a side sectional View upon the line 2-2 of Fig. 1; Fig. 3 being a t'op'view in fragmentary section of the casing with the cover removed and the impeller in a different position; Fig. 4 being a top plan view of the guide member, and Figs. 4a and 41; being, respectively, front and side elevations; Figs. 5 and 6 being perspective views of the opened casing showing the impeller disc in position; Figs. 7 and 8 being front and side elevations of the impeller disc, Fig. -8 being in fragmentary section; Fig. 9 being a side elevation of the shaft member; and Figs. 10 to 22 being diagrammatic views illustrating the operation of the pump.
  • Figs. 31 to 37 show another embodiment, Fig-.31 being a side view in fragmentary section of the open casing; Fig. 32 being a side sectional view upon the line 32-32 of Fig. 31; Fig. 33 being a bottom view of the impeller disc; Figs. 34 and 35 being, respectively, side end top views of the split guide; Fig. 36 being a perspective view showing the slot in the impeller disc, and Fig. 37 being 2. diagrammatic perspective view illustrating the operation of the guide.
  • Figs. 38 and 39 show still another embodiment, Fig. 38 being a side sectional view, and Fig. 39 being a top view.
  • Fig. 40 is a diagrammatic view of an embodiment similar to the embodiments of Figs. 23 to 30 and 31 to 37 illustrating the mathematical relationships.
  • the pump shown in Figs. 1 to 3, 5 and 6 com" prises a casing C, the shaft member 21, the impeller disc 31 and the guide member 34.
  • the upper part of the casing 0 (Figs. 1, 3, 5 and 6) is provided with ports 17 and 18 for the intake and the outlet of a fluid medium which is to be pumped and acted upon by the mechanism.
  • the intake and outlet pipes 19 and 20 are carried by the'cover 75, into which they are threaded at 76.
  • the cover is secured to the horizontal flange 77 of the casing C by the bolts 78 passing through the openings 79 (see Figs. 3, 5 and 6).
  • each of the two halves 14 and 15 of the casing are provided with horizontal axial extensions'80 providedwith openings 80 into which are fitted the bearing sleeves 81, the bearing sleeves 81 receiving the bearing ends 22 and 23 of the main drive shaft 21 (see also Fig. 9)
  • the middle oblique eccentric or cam portion 24 of the shaft 21 forms a bearing for the impeller 31 and is positioned so that its center point will at all times coincide with the center point 82 of the casing C and the center of the spherical section I.
  • the sphericals'ections 25 and 26 Connected between the central eccentric cam portion 24 and the end portions zz and 23 of the shaft are the sphericals'ections 25 and 26, which are each of the same shape and dimension and are symmetrically positioned within the interior chamber I on both sides of the center point 82.
  • Thespherical sectors 25 and 26 are provided with vertical flat surfaces 29 and 30 transverse to the axis of the shaft 21, said flat surfaces 29 and 30 bearing against the sides 84' of the chamber 1.
  • the inside faces of the spherical sections 25 and '26 are transverse to the axis of the eccentric. These faces 32, together with the peripheral surfaces 83, bear against the impeller 31.
  • the impeller disc is shown inside of the casing in Figs. 1, 2, 3 and 5, and removed therefrom in Figs. 7 and 8.
  • the impeller disc 31 has two outwardly converging truncated or frusto-conic'al propelling surfaces 84 which at their outer peripheries are joined together-by the spherical surface 85 which closely conforms with the surface 85 of the interior of the chamber I (see Figs. 2 and 5).
  • the impeller disc 31 is provided with the bearing surfaces 24', 32 and 83, which bear upon thecorrespondingly numbered surfaces on the shaft (see particular-1y Fig. 9)
  • the guide member 34 (see Figs. 4, 4a and 412) takes the form of a fragmentary spherical segment and has inwardly converging side walls which contactwith the side walls 35' of the slot 34 (Fig. '7).
  • the inside surface 36 of the guide member 34, as well as the exterior surface 87 are taken from the surface of a sphere, while the end surfaces 88 of the guide member are taken from the surface of a cylinder.
  • the cylindrical side surfaces 88 contact or conform closely with the side walls 84' of the chamber I of the casing C and prevent any communication from the inlet to the outlet across the top of the chamber I.
  • the side walls of the chamber I are provided with recesses 88' to receive the ends of guide 34, so that there will be a surface instead of a linear contact or conformation therebetween to prevent liquid or fluid communication.
  • the spherical surface 87 of the guide closely contacts with the top of the chamber I, while the lower spherical surface 36 contacts both with the correspondingly shaped 7 surface 36' at the bottom of the slot of the impeller disc (see Figs. 7 and 8) and with the spherical surfaces 27 and 28 on the shaft 21.
  • the lateral faces 25 of the guide converge toward the center point 82 of the casing C and of the shaft 21.
  • Theguide member is provided with a central opening 89 (see Figs. 4, 4a and 4b) into which projects the pivot stud 37.
  • This stud is provided with a flange. 90 which fits into the recess 90' in the casing and is bolted to the casing C by the screws 91.
  • Fig. 10 illustrates diagrarmnatically the turning of the impeller disc
  • Figs. 11 to 22 show top, front and side views of the impeller disc in each one ofthe positions designated on Fig. 10, namely I, II, III and IV.
  • Figs. 11, 12 and 13 are, respectively, top, front and side views of the impeller disc in position I; Figs. 14, 15 and 16 are corresponding views in position II; Figs. 1'7, 13 and 19 are corresponding views in position III; and Figs. 21, 22 and 23 are corresponding views in position IV.
  • Figs. 11, 14, 17 and 20 approximately correspond diagrammatically to Fig. 3; Figs. 12, 15, 18 and 21 to Fig. 1; and Figs. 13, 16, 19 and 22 to Fig. 2.
  • the impeller disc 31 will be caused to sweep backwardly and forwardly both horizontally and vertically across the interior chamber I with the result that the impeller disc 31 will partake of an oscillation.
  • the axes about which the impeller tends to swing will also tend to rotate about the fixed center point 82 of the casing, impeller disc and the shaft, the horizontal axis of the impeller disc 31 tending to swing in a horizontal plane (see Figs.
  • the impeller disc 31 will divide the interior I of the casing G into two chambers 92 and 93 which are symmetrically disposed in respect to the center point 82 of the pump.
  • the chamber 92 occupies the right side of the casing while the chamber 93 occupies the left side of the casing.
  • the chamber 92 occupies the top side of the casing while the chamber 93 occupies the bottom side of the casing, and in Figs. 20, 21 and 22 the chamber 92 occupies the left side of the casing while the chamber 93 occupies the right side of the casing.
  • These chambers are successively opened and closed to the inlet 17 and to the outlet 18 so that fluid or liquid which is received through the inlet 17 will be carried to the outlet 18.
  • These compartments 92 and 93 will transfer liquid or fluid through the lower half of the casing from the inlet 17 to the outlet 18 and will be prevented from transferring fluid or liquid reversely from the outlet to the inlet in the upper half of the chamber I by the oscillating guide 34.
  • Figs. 11, 14, 17 and 20 the compartments 92 and 93 must move through and will be divided by the guide member.
  • the compartment 93 is moving to the left and is bisected by the guide 34, while in Fig. 14 both compartments are divided by the guide 34.
  • Fig. 17 only the compartment 92 is divided by the guide, and as the compartment 92 moves to the left, the greater part of its volume also moves to the left of the guide member 34, decreasing the amount of said volume on the right of the guide member.
  • the area or line 95 isal ways symmetrically disposed diametrically directly opposite to the area or line 94 in respect to the center point 82;
  • the compartment 92 is be- 1 ing moved through the guide 34 so that it is increasing in volume in respect to the inlet 1'7 and liquid or fluid is being sucked into the opening.
  • the area of the inlet port 17 and the outlet port 18 should be always such that the chamhere 92: and 93' may substantially immediately fill with liquid or fluid as they are increased in volume in communication with the inlet and/or emptied of fluid or liquid as they are decreased in volume in communication with the outlet 18. Otherwise, there would be a tendency for the impeller disc, in the case of uncompressible liquids, to create a vacuum in the inlet side and to compress liquid: on the outlet side, which would reduce the eificiency of the pump.
  • the velocity of the movement of the impeller disc 31 is substantially uniform at all times, there being no minimum or maximum velocity, merely a change in direction.
  • the impeller is preferably so designed that its center of gravity coincides with this central point 82.
  • the shaft bearings of the impeller 24, 32' and. 33' maybe replaced by ball or roller bearings andmaybe made similarly converging towards the center of the pump structure as more fully shown in my copending application, Serial No. 656,639, flied Feb. 13, 1933.
  • Figs. 23' to 30 is shown a somewhat diiferent embodiment in: which the impeller disc 42 has outwardly diverging. side walls 45 and is provided with. a conical guide 38 having an integral pivotal stud. 40. This stud bears in a socket in the housing. 41, which. housing is connected. by the screws 96 to the casing C.
  • the truncated conical guide member 38 may be considered as a frustro-conical section taken from a spherical annulus.
  • the outer spherical portion 97 of the guide member contacts with the interior wall of the casing and the inner spherical surface 39 of the guide member slides over the spherical surface 98 at the bottom of the slot 43 in the impeller disc 42.
  • the sides 44 of the slot 43 contact with the side of the frustro-conical guide 38, said guide rolling or sliding through said slot during the oscillation of the impeller disc upon movement of the shaft 21.
  • the conical surfaces of the guide 38, as well as the walls 44 of the slot 43, converge toward the center point 82 of the mechanism.
  • the oscillating impeller disc 42 with its outwardly diverging walls 45 takes the form of a spherical sector.
  • the interior I of the casing C also takes the form of a spherical section, conical projections 102 being provided at opposite sides of said casing. These projections have central openings to permit of the location of the bearing sleeves 81 for the shaft 21. i
  • the periphery of the impeller disc 42 will contact over a wide area 99 with the interior I of the casing C, with the result that leakage across the periphery disc will be decreased, as compared with the embodiment shown in Fig. 1.
  • the sides of the impeller disc 42 on the other hand will obliquely lay against the sides of the interior chamber I along the conical surfaces 100 on the side of the disc 42 and 101 on the sides of the projections 102.
  • the conical guide 38 does not also con tact with the Walls of the casing to prevent direct communication'between the inlet and outlet ports, it is necessary to provide the wings 46 on either side of said guide 38 (see Figs. 23, 25, 26 and 27). These wings take the form of annular sections and fit into slots 47 in the conical bearing portions 102 of the casing C (see particularly Fig. 26). The inner surfaces 103 of these wings 46 are curved so as to contact closely with the sides of the conical guide 38.
  • Figs. 28 and 30 are shown diagrammatically the different relative positions of the impeller disc 42, the wings 46 and the conical guide 38.
  • the operation and fluid actuating movement of the impeller disc 42 is substantially. the same as shown in Figs. 10 to 22.
  • the impeller will similarly oscillate both laterally and vertically.
  • the conical guide 38 and the wings 46 will divide the pumping compartments, as they pass through the guide and preventing direct communication from the outlet to the inlet.
  • the impeller disc 59 is also provided with outwardly diverging side surfaces 104.
  • the disc is driven by the eccentric portion 55 of the shaft 56.
  • the shaft 56 terminates within the casing C in the ball element 63--64.
  • the ball element includes the spherical sections 63 and 64, the opposite sides of said sections hearing at 105 and 106 against spherical cavities in the side of the casing.
  • the guide member (see Figs. 31, 34, 35 and 37) includes a plate 50 having a support stud 51,
  • the guide member also includes the split frustro-conical members 48 and 49, the outer surfaces of which contact with the interior surfaces 60 and 61 of the slot 108 in the impeller disc 59 (see Fig. 36), and the inner spherical surface 109 of which contacts with the spherical surface 109 at the bottom of the slot 108.
  • Fig. 37 diagrammatically illustrates the sliding movement of the split conical members 48 and 49 in respect to the plate 50.
  • the guide portions 48 and 49 may slide with respect to the plate 50 and will turn with respect to the impeller disc 59.
  • the rotary friction between the guide elements 48 and 49 and the impeller 59 and within the guide between the relatively sliding surfaces 53 and 54, and 57 and 58, will be reduced to a minimum.
  • guide member 34 functions as an oscillating wall which has to overcome a considerable pressure caused by the fluid passing through the casing of the pump.
  • movable walls 46 take the place of the oscillating wall of the first-named modification, and only the center portion of that wall, namely conical guide member 38, continues to oscillate, so that the strain caused by the pressure of the liquid against the guide member is largely eliminated.
  • FIG. 38 and 39 there are shown two impeller discs and 151 included in a casing with inlet ports and outlet ports 16]. consisting of three sections 152, 153 and 154. The sections 152, 153 and 154 are joined together by the flanges 155 and the bolts 156.
  • the interior chambers of the casing I include two spherical segments or sections 157, each of which cooperates with one ofthe impeller discs 150 and 151 to form a pump chamber.
  • Figs. 38 and 39 there are three pumping compartments 162, 163 and 164. These compartments all function to transfer fluid or liquid from the inlet tothe outlet ports, and it is evident that any number of these impeller discs 150 and 151 may be connected together as indicated in Figs. 38 and 39 for a multiple pump having as much capacity as desired.
  • the impeller discs 150 and 151 and the guides 158 roll or move upon each other at their adjacent surfaces instead of rolling and moving over the side wall of the cas-
  • the impeller 31 in the course of its oscillating movement causes a displacement of fluid both when it moves toward the wall of the casing C and when it moves away from the wall of the casing C.
  • the fluid is forced out of the casing through the outlet or is forced from one part of the interior chamber of the casing to another part of the interior chamber of the casing.
  • the displacement action of the oscillating impellerof the present invention diiiers substantially from the displacement action of the piston of a. reciprocating pump in that whereas the motion of the reciprocating piston causes a linear movement of fluid to the end of a cylinder, in the device of the present application on the other hand, the displacement action of the impeller causes a rotational movement of. the fluid from the inlet to the outlet along the face of the impeller.
  • the guide with its adjuncts extending between the side walls of the chamber I causes the oscillating action to draw in fluid from the inlet and toforce fluid out through the outlet.
  • the volume for containing fluid or liquid within the casing the device will always be substantially constant since it will be equivalent to the volume of the interior chamber minus the volume of the impeller and the volume of the guide with its adjuncts.
  • the impeller will divide the chamber into two symmetrically positioned pumping chambers which, although they are of substantially constant volume throughout operation of the device (except for the volume of the guide or its adjuncts which may project into them) they nevertheless will have portions of varying volumetric capacity in communication with the inlet increasing while the volume in communication with the outlet is decreasing.
  • the guide is a fixed fluid impelling device which moves relatively through thecompartments on opposite sides of the impeller to increase their volume on one side, causing drawing in of liuqid from the inlet and to decrease their volume on the other side, causing discharge of liquid through the outlet.
  • This action is quite diiferentfrom the action of a reciprocating piston pump in which there is a fixed piston and a movable cylinder, in that in the present invention the displacement member or the, guide member moves continuously through the compartments, one after the other without the abrupt reversals as occur in all reciprocating pumps.
  • the shaft may be rotated in either direction, and that as a result of such reverse rotation the inlets and oule'ts will be siml larly reversed.
  • the discharge output of the device is proportional to the speed of rotation of the shaft, while the head or height of delivery is independent of the speed of rotation.
  • FIG. 40 The diagrammatic sketch in Fig. 40 shows the various important dimensions to be determined when calculating the pump with a diverging impeller as shown in Figs. 23 and 33.
  • the maximum interior radius of the pumping compartment may be taken 75 min, while the'minimum interior radius may be taken as 57.5 mm.
  • Ra is the interior radius of the chamber I where it contacts with the outer peripheral surface of the impeller, while Hz is theradius of the shaft ball element 25 and 26 of Fig. 23 and 63 and 64 of Fig. 32.
  • the half angle of the casing a may be taken as 42 while the half angle of the impeller 5 may be taken as 17.
  • the half angle of oscillation 'y will be equal to the difference or 25.
  • the guide member is made converging, as is also the slot in the impeller disc and the separating wall and guide member may be combined in one member as shown in Figs. 4, 4a and 41), or they may be separated as shown in the embodiments of Figs. 23 to 37.
  • a casing with side walls and with a. continuous spherical peripheral wall and an impeller disc therein, means to impart an oscillating movement to said disc about a fixed center point, and a tapered guide engaging said disc to prevent rotation thereof while it is being oscillated by said means, the relatively sliding surfaces of said guide and said disc converging toward the center point of said casing.
  • a casing with side walls and with a continuous spherical peripheral wall and an impeller disc therein, a shaft on which said disc is mounted, means to drive said shaft to cause said disc to undergo an oscillating movement about a fixed center point, and a guide for said disc, said guide preventing rotation of said disc but permitting relative sliding and pivotal movementof said disc, said guide and disc being so arranged that their relative sliding bearing contact surface will converge toward said center point.
  • a casing with sidewalls and with a continuous spherical peripheral wall and an impeller disc therein, a shaft on which said disc is mounted, means to drive said shaft to cause said disc to undergo an oscillating movement about a fixed center point and having an eccentric bearing portion for said disc, and a guide for said disc, said guide preventing rotation of said disc but permitting relative sliding and pivotal movement of said disc, said guide and disc being so arranged that their relative sliding bearing contact surface will converge toward said center point.
  • an impeller disc having a transverse slot therein, a shaft with an eccentric element carrying said disc, means to drive said shaft to cause said disc to undergo an oscillating movement about a fixed center point, and a guide located in said slot, said guide preventing rotation of said disc but permitting relative sliding and pivotal movement of said disc, said guide and disc being so arranged that their relative sliding bearing contact surface will converge toward said center point.
  • an impeller disc having a slot therein, a shaft with a cam element carrying said disc, means to drive said shaft to cause said disc to undergo an oscillating movement about a fixed center point, and a guide taking the form of a segment of a spherical sector, said guide preventing rotation of said disc but permitting relative sliding and pivotal movement of said disc, said guide and disc being so arranged that their relative sliding bearing contact surface will converge toward said center point.
  • an impeller disc having a slot therein, a shaft with an oblique offset portion carrying said disc, means to drive said shaft to cause said disc to undergo an oscillating movement about a fixed center point, and a conical guide member extending into said slot, said guide preventing rotation of said disc but permitting relative sliding and pivotal movement of said disc, said guide and disc being so arranged that their relative sliding bearing contact surface will converge toward said center point.
  • a casing with side walls and with a continuous spherical peripheral wall and an impeller disc therein having a slot, a shaft having an oblique portion forming a bearing for said disc, means to drive said shaft to cause said disc to undergo an oscillating movement about a fixed center point, the side walls of said slot converging toward said center point of the piston, and a guide fitting in said slot and sliding therein with corresponding contacting converging side walls, said guide preventing rotation of said disc but permitting relative sliding and pivotal movement of said disc, said guide and disc being so arranged that their relative sliding bearing contact surface will converge toward said center point.
  • a casing having an interior chamber, an impelling piston positioned obliquely therein, means to impart an oscillating movement to said piston about a fixed center point, and a guide engaging said piston to prevent rotation thereof while it is being oscillated by said means, said impeller being provided with a transverse slot and said slot receiving said guide, said guide including a separating wall extending transversely across said chamber at one side thereof and through said slot, the contacting surfaces of said slot and said transverse Wall converging towards the center of the casing.
  • a casing having an interior chamber, an impelling piston positioned obliquely therein, means to impart an oscillating movement to said piston about a fixed center point, and a guide engaging said piston to prevent rotation thereof while it is being oscillated by said means, said impeller being provided with a transverse slot and said slot receiving said guide, said guide including a separating wall extending transversely across said chamber at one side thereof and through said slot, the side surfaces of said separating wall closely contacting with the side surfaces of said slot, said contacting surfaces converging towards the center of the casing and the end surfaces of said wall contacting with the side walls of said interior chamber.
US656637A 1933-02-13 1933-02-13 Pump Expired - Lifetime US1984447A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942384A (en) * 1973-09-17 1976-03-09 Parker Swashplate Limited Swashplate machines
EP0550044A1 (en) * 1991-12-31 1993-07-07 Leonard Meyer Nutating internal combustion engine
US5685702A (en) * 1992-12-16 1997-11-11 Manfred Hofmann Swash-plate machine
US20100122685A1 (en) * 2008-11-20 2010-05-20 Warsaw Univ. Of Life Sciences Spherical two stroke engine system
WO2016120655A1 (en) * 2015-01-30 2016-08-04 Pumpsystems Gmbh Wobble plate pump, designed for easy maintenance

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3942384A (en) * 1973-09-17 1976-03-09 Parker Swashplate Limited Swashplate machines
EP0550044A1 (en) * 1991-12-31 1993-07-07 Leonard Meyer Nutating internal combustion engine
US5685702A (en) * 1992-12-16 1997-11-11 Manfred Hofmann Swash-plate machine
US5897301A (en) * 1992-12-16 1999-04-27 Reis; Fritz Swash-plate machine
US20100122685A1 (en) * 2008-11-20 2010-05-20 Warsaw Univ. Of Life Sciences Spherical two stroke engine system
US8689766B2 (en) * 2008-11-20 2014-04-08 Wieslaw Julian Oledzki Spherical two stroke engine system
WO2016120655A1 (en) * 2015-01-30 2016-08-04 Pumpsystems Gmbh Wobble plate pump, designed for easy maintenance

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