Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
• • 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
  • F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
  • F01B1/06—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement
  • F01B1/062—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders in star or fan arrangement the connection of the pistons with an actuating or actuated element being at the inner ends of the cylinders
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
  • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
  • F04B1/0404—Details or component parts
  • F04B1/0452—Distribution members, e.g. valves
  • F04B1/0465—Distribution members, e.g. valves plate-like
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B19/00—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00
  • F04B19/02—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 having movable cylinders
  • F04B19/027—Machines or pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B1/00 - F04B17/00 having movable cylinders cylinders oscillating around an axis perpendicular to their own axis

Definitions

• the object of the invention is a radial piston eccentric motor/pump, which includes - a ring structure (1') and an axle (7) as an opposing member rotating in relation to it in bearings,
• operating medium signifies either liquid or gas and the matter is thus one of either pneumatic or hydraulic devices.
• the matter may also be one of a combustion motor.
• linear force member means a device, for example a hydraulic cylinder, which directs a force in a linear direction in relation to its attachment point.
• the motor may also be a so-called hub motor, in which the shaft remains stationary and the case revolves around it.
• Low-revolution hydraulic motors are required in various kinds of machines to rotate drums and other components of the machines with great power. Hydraulic motors of this kind have long been sought for landfill compactors, but motors of this kind have not been available. Therefore high-revolution hydraulic motors and reduction gearboxes as well as chain-drive transmissions to the rollers have been used in these.
• the intention of this invention is to create a general method, by means of which the mutual rotation of the aforesaid first and second joints is prevented.
• the intention of this invention is also to create such a motor, in which the aforementioned problems have been solved, and a motor with a great torque can be created by means of a simple construction.
• the intention of the invention is also to create a simple pump/compressor, operating at a good efficiency. It is also the intention of the invention to make it possible to locate the motor/pump in a small space.
• the charac ⁇ teristic features of two methods in accordance with the invention are presented in Patent Claims 1 and 2 and the characteristic features of a motor/pump that implements two separate methods in accordance with Patent Claim 1 are shown in Patent Claims 3 and 17.
• Patent Claim 4 shows another motor/pump using the method in accordance with Patent Claim 2. All the motors/pumps in accordance with the invention have a common tendency towards creating such an angle between the first and second joints that the force rotating the joints of the force collection, member are cancelled.
• the collector member attached to the crankshaft by bearings corresponds to an eccentrically set rolling or sliding ring surface, along which the corresponding joints are free to move.
• the self-centering of the rolling that takes place by means of pulling force presupposes that the first joint is closer to the centre point of the rolling ring surface than the centre point of the rolling component.
• the rolling ring surface must be directed against the pulling of the rolling component.
• the first joints are on the opposite side of the rolling ring surface to the corresponding rolling components, but not always.
• jointing thus signifies operational jointing.
• a unique case of jointing is formed by piston rod pins held beneath the circumference of the ring, which can always slide or roll along the surface of the circumference to such a position that the cylinder forces travel continuously through the centre of the crankshaft.
• the ends of the piston rod or cylinder are able to move in the direction of the ring and to direct the cylinder force to always travel through the centre of the crankshaft.
• the synchronization of the collector ring to the aforesaid angle can take mechanically. It is important that the cylinder either is not bent at all,.or that the bending load of the cylinder being used for locking remains a fraction of what it has been previously, because the collector member is rotated to such an angle in relation to the case that the resultant of the cylinder forces travels through the crankshaft and at the same time through the centre of the collector member and close to it.
• Cylinders in thrust tend to increase the deviation from the point of equilibrium. Controlling the rotation by means of pressure of the cylinders of the return side adjustment is quite complicated, on account of which a motor/pump with cylinders in thrust is preferably equipped with mechanical locking, which retains the rotation of the collector ring in the region of the average angle of equilibrium, when the forces to be carried mechanically remain a fraction of the previous ones.
• the cylinders are replaced by electrically operated linear spindle motors, in which case their precision of control can be combined with a great torque.
• FIG 1 shows the principle of the method in accordance with the invention.
• Figure 2 shows a cross-section of a hydraulic motor equipped with pulling cylinders and installed at the end of a roller.
• Figure 3 shows a cross-section of the hydraulic motor in Figure 2 at the point II-II.
• Figure 4 shows the feed and distribution plates of the hydraulic motor in Figure 2.
• Figure 5 shows the geometry relating to optimal dimensioning.
• Figures 6 and 7 show a motor equipped with thrust cylinders.
• Figure 8 shows second kind of motor equipped with thrust cylinders.
• Figure 9 shows a third kind of motor equipped with thrust cylinders.
• Figure 10 shows a fourth kind of motor equipped with thrust cylinders.
• Figures 11 and 12 show a second kind of motor equipped with pulling cylinders.
• Figures 13 and 14 show a collector ring adapted to a cut crankshaft.
• Figure 15 shows a second type of collector ring construction.
• Figure 16 shows a third type of collector ring construction.
• Figures 17 and 18 show a fourth hydraulic motor equipped with pulling cylinders.
• Figures 19 - 21 show fifth type of hydraulic motor equipped with thrust cylinders, and details of it.
• Figures 22 - 25 show a sixth type of hydraulic motor equipped with thrust cylinders, and details of it.
• Figure 26 shows the hydraulic diagram of one pump.
• ball bearings 82 can be arranged in accordance with case C to roll along an external rolling surface 83, which is most advantageously attached to ring structure 1'.
• the axle 7 does not have a crank, but has attached to it a suitable disc, to which the linear force members 4' are attached by means of the joints 80.
• the first joints 13' are permanently attached to axle 7 and the rolling ring 83 attached to ring structure 1' carries the second joints 9'.
• the collector member for the eccentric forces is formed in various cases of either a collector member attached to the crankshaft by bearings, or by an eccentrically arranged rolling ring surface.
• pulling members are used that tend to rotate the joints that transmit forces to the collector member around its centre.
• the joints are permitted to rotate either together or singly, when a dynamic equilibrium is achieved, which is maintained, despite the rotational movement.
• the hydraulic motor in accordance with Figures 2 - 4 is a so-called hub motor, in which case the crankshaft 2 is attached to the frame 72 of the machine, and the case 1 rotates a roller 33.
• the case is supported to rotate on the ends 32 and 7 of the crankshaft 2 by means of the bearings 14 and 15.
• a collector ring 3' used as a collector member 3 is attached to crankshaft 2 by means of bearings 8 in such a way that it can rotate, to which the ends of the piston rods 10 of the hydraulic cylinders 4 are attached by means of joints 9.
• the end of each cylinder component 11 next to the piston rod 10 includes a forged end-piece 30, which also includes axle stubs 31 to secure the cylinder component to the case 1 with the aid of bearings 13.
• the feed and return lines 18, 18' for the hydraulic oil are brought to the feed plate 5 through an eccentric plate 20 that forms part of the crankshaft. Between plate 20 and feed plate 5 there is in addition an intermediate case 16, which is secured to the feed plate 5 in such a way that feed plate can move in the direction of the shaft.
• the feed plate 5 feeds hydraulic oil to a distribution plate 6 attached to the collector ring 3', and distributes it to the cylinders 4 through hose 29 and at the same time collects oil from them again through the distribution plate 6 back to the feed plate 5 and the return line. Later the operation of the distribution plate and the feed plate will be described in greater detail.
• FIG. 2 shows diagrammatically turning cylinder 19, one attachment point of which is attached to the eccentric plate 20 and the other to the intermediate case 16.
• the hydraulic cylinder 19 is double-acting and its thrust and traction connections are connected to the feed and return side lines. If it is desired to change the direction of revolution of the motor, the feed and return side pressure oil levels change and at the same time the turning cylinder 19 goes to its other extreme position, when the intermediate case 16 and with it the feed plate 5 turn by the selected angle round the crankshaft.
• the feed plate 5 is turned to the same direction in which distribution plate 6 is compared with the cylinder distribution of the case. In connection with the change in direction the state of equilibrium of the collector ring 3' moves to the opposite side, which is taken into account by turning the feed plate.
• the difference of angle a in the state of equilibrium in relation to the distribution of cylinders is about 10°, that is, the movement of the feed plate from one side to the other is a total of 20°.
• the difference in angle ⁇ of the state of equilibrium of the collector ring 3' and thus also of the distribution plate 6 is not constant, but varies for example in the hydraulic motor in accordance with this example from 10° - 12°. Because the difference of angle also depends on the operating pressure, more precise compensation can be achieved by adding springs to either side of the piston of the hydraulic cylinder, by means of which compensation takes place dependent on the pressure.
• a feed and distribution plate is shown in Figures 4a and 4b, in which the grooves 23 of the distribution plate 5 are located opposite the openings 25 in the feed plate 6.
• the aforementioned feed and return lines 18 are connected to the connection 21 of the feed plate 5, from which they gain access to the main channel 22. From there they are divided into corresponding feed and exit channels 23', Now they thus pass through the feed side channel 23 to their openings 25, which are in this area and thus in turn for operation.
• a channel leads from these openings 25 to connection 26, to which the hoses 29 leading to the corresponding hydraulic cylinders are connected.
• Correspon- dingly the openings 25 of the distribution plate 6 in the area of the return side channel 23' feed the return oil from the corresponding hydraulic cylinders.
• Case 1 acts advantageously as an oil tank, in which case the case oil cools the hydraulic devices.
• the accompanying example motor can naturally be adapted by selecting a different number of hydraulic cylinders or by placing two or more series of cylinders or this type in parallel on the same crankshaft.
• the bearing load can be considerably reduced by setting the cranks of the different series of cylinder in different directions.
• a motor/pump can be constructed to fit the smallest possible space by dimensioning it in accordance with the following formulae, which were discovered when developing the invention.
• Figure 5 shows schematically the geometry that determines the greatest swept volume of the cylinder.
• the theoretical stroke volume of a single cylinder is shown by broken lines. Its height is s and radius r and distance from the axis of rotation x. Seen from the axis of rotation the swept volume appears in the angle 2 ⁇ .
• R c the minimum value of the extreme distance of the swept volume, when the revolution volume q, the number of cylinders, and the constant c that determines the cylinder construction are given.
• the revolution volume q can be derived from the following formula:
• R c is obtained as a function of x, which is derived and set to a value of zero in order to obtain the extreme value point:
• Figures 6 and 7 show a hub motor equipped with thrust hydraulic cylinders.
• the same reference numbers as in the above are used for the operationally same components, in which case the following components have been dealt with above: case 1, crankshaft 2, its ends 32 and 7, collector ring 3', hydraulic cylinder 4, cylinder case 11, piston 12, piston rod 10 and jointing 9, feed and distribution plates 5 and 6, eccentric plate 20, and turning cylinder 19.
• the cylinder case is attached, in relation to the piston rod, to the case by joint 34 at its opposite end.
• the changes in angle of the thrust forces are then smaller during revolution than those in the former, which is significant especially in the case of a hydraulic motor equipped with thrust cylinders.
• the distribution plate 6 distributes hydraulic oil to the channel 35 of the piston rod 10.
• the lower end of the piston rod 10 is forged into a transverse pin 36, at the opposite end of which is the piston 37 which is larger than the channel, and which rests against the pressure bearing 38, which in turn rests on the opposite eccentric plate of the crankshaft.
• the transverse pin 36 presses the distribution plate 6 against the feed plate 5 with the desired force that depends on the pressure of the system.
• Figure 8 shows various means of locking the collector ring 3' with the case at a certain stage.
• the same reference numbers as in the above are used for the operationally similar components, these being: case 1, crankshaft 2, collector ring 3', hydraulic cylinders 4, hydraulic cylinders' jointing 9 and 34, hydraulic cylinder case 11, piston 12, and piston rod 10.
• case 1, crankshaft 2, collector ring 3' hydraulic cylinders 4, hydraulic cylinders' jointing 9 and 34, hydraulic cylinder case 11, piston 12, and piston rod 10.
• the twist can be limited by means of some intermediate device with a fixed dimension, which may be a spring 41, cable 42, or a hydraulic cylinder carrying pulling with a piston and having a fixed dimension.
• the cable 42 is located inside spring 41 and thus a compact pulling device 40 is created.
• the task of the spring is, however, mainly to keep the loose cable in a compact packet, out of the way of the hydraulic cylinders.
• the upper hydraulic cylinder is marked with the reference number 4.1, and it is at the moment shown rarrying the pulling loading at the end of the stroke.
• the sealing of the feed and distribution plates 5 and 6 against each other is here of the same kind as in the form of applica * n shown in Figure 1.
• the distribution plate 6 is locked to rotate with the case 1 and it includes piston 17, which rests against the case.
• the surface opposite this in the distribution plate 6 presses it against the feed plate 5, which rests in turn on the eccentric plate 20 of the crankshaft.
• Pressure bearing 49 is outside of the case, in which case axial loads do not act on bearings 15 and 14.
• the locking of the collector 3' takes place by means of gearwheel transmission, which includes the circumferential toothing 43 in the collector 3', the gearwheels 44 and 45 secured to the crankshaft, toothed ring 46 belonging to the case, and the adjustment gearwheel 47 equipped with handle 48.
• the toothed ring 46 can at first be thought of remaining in place, when the gearwheels 45 and 44 of the gearwheel transmission transmits the rotation of the case to the collector ring 3' at the same angular velocity.
• the toothed ring 46 of the case is attached to the case in such a way that it can be rotated and it can be adjusted by means of gearwheel 47 by turning it by handle 48. Suitable control devices, which are not shown here, are attached to this handle 48.
• the gearwheel 47 and thus the toothed ring 46 can be turned, when at the same time the collector ring 3' can be rotated in the desired way in relation to the case. A turning is then obtained in the correct direction depending on the direction of rotation and the turning can be even controlled in such a way that the position of the collector ring 3' remains continually at the point of equilibrium during the entire revolution.
• Figure 10 shows another alternative way of using an intermediate device of a fixed dimension in order to lock the collector ring 3'.
• the same reference numbers as above are used for similar parts, these being: case 1, crankshaft 2, collector ring 3', hydraulic cylinder 4, its case 11, piston 12, and piston rod 10.
• FIGS. 11 and 12 show a new method of locking the collector ring and a hydraulic oil distribution device.
• the same . reference numbers as above are used for the operationally similar components, these being: case 1, crankshaft 2, its bearing axles 32 and 7, collector ring 3', hydraulic cylinder 4, its case 11, piston 12, piston rod 10, its jointing 9, the lower end 30 of the hydraulic cylinder, and the axle pin 31.
• the collector ring 3' includes a lug 52 in which there is a link 58.
• the axle pin 31 of the upper hydraulic cylinder 4 is adapted to fit this link 58, the length of which corresponds to the length of stroke.
• the collector ring can then rotate round the ring along with the crankshaft 2, but it does not turn in relation to case 1.
• the lug is set at a fixed angle, when a change of direction is not possible.
• a motor that changes direction of rotation can, however, easily be created in such a way that the lug is jointed to turn to a limited extent, for example ⁇ 9°, and it is secured to an extreme position in accordance with the direction of rotation by means of a hydraulic cylinder.
• the hydraulic oil distribution device 53 is suitable for low revolution pump and motors.
• the distribution device 53 consists of a valve block 57, which contains hydraulic oil feed and return channels 18 and 18' as well a spring-loaded spindle valve 55 for each cylinder, the feed openings of which are each connected by separate hoses 56 to each cylinder through the cylinder axle pin 31 and the end section 30.
• the spindle valves 55 are operated by a counter-wheel 54 attached to the axle end 7, and which is raised for about half of the diameter. By means of this each spindle valve is pressed inwards by turning 170°, when the corresponding hydraulic cylinders are connected to the feed line and correspondingly the protruding spindles direct the hydraulic oil from the cylinders to the return channel.
• the difference of angle of the position of equilibrium is not constant, but oscillates on either side of an average value.
• One attempt is to entirely remove the torque that affects the collector member, when it should follow precisely the difference of angle of equilibrium in relation to the case during rotation.
• Another attempt which is generally in contradiction to the first is to achieve an even volume of flow, when an even output moment is obtained from a motor, and an even output is obtained from a pump.
• the collector member should rotate under forced control or by means of a control circuit in a manner corresponding to the stated objective.
• This control requires a sensor device, by means of which the relative positions of the case, collector member, and crankshaft can be ascertained.
• the collector member has always been a ring type in that it is attached to the crankshaft by bearings.
• a wheel attached to the crankshaft by bearings in accordance with Figures 13 - 19 can, however, also be used as a collector member.
• cranks 2' which are attached to the case by bearings by means of the axles 7', correspond operationally to a crankshaft.
• Wheels 3 which here are formed of short lengths of axle, and which are used as a collector member, are attached by bearings to crank 2'.
• Axle pins 69 which act as a joint 9' together with the end of piston rod 10, are attached to the circumference of the opposite collector wheels 3".
• FIG 15 shows another example of the form of the collector wheel 3".
• collector wheel 3 recalls the aforementioned collector rings, because a protrusion that is operationally similar to the aforementioned wheel is formed in the axle of the combined collector wheel 3", the ends of the piston rod 10 being attached to this by means of joints 9.
• the collector wheel 3" is attached by bearings to the opposite cranks 2", which here form operationally the said crankshaft.
• Figure 20 shows one solution for bringing the joints 9 of the piston rods as close as possible to the centre of a crankshaft 2 of this kind.
• components that operationally have been dealt with previously are given the same reference numbers, i.e. crankshaft 2, collector ring 3', piston rod 10 and its jointing 9, eccentric plate 20, and crankshaft bearing axles 32 and 7.
• the halves 67 of the collector ring 3' as a first pair, the crankshaft 2, and as a second pair the pin 68 of the piston rod 10 are manufactured in such a way that bearing metal pairs are created directly.
• Suitable lubrication for example splash lubrication or pressure lubrication can be combined with this solution.
• Figures 17 and 18 show still another form of application of a hydraulic motor equipped with pulling cylinders, in which a construction is used that deviates from that used in previous versions and in particular uses the principle in accordance with section B of Figure 1.
• This case is one of a double row motor.
• the same reference numbers as previously are used for operationally similar components, these being case 1, its bearings 14 and 15, crankshaft 2, its eccentric plate 20 and bearing axles 32 and 7, hydraulic cylinder 4, piston rod 10, and jointing 13 of the hydraulic cylinder 4 to the case 1.
• the collector member 3 of the forces is formed by the ring series which holds the ends 74 of the piston rods 10, together with the rolling bearings of the pins 74.
• the outer rings 76 are attached to the eccentric plates 20 of the crankshaft 2, but they may also be freely rotating if suitably shaped. In the centre there is a freely rotating ring 73 equipped with a support rib. Between these there remains an opening the width of a piston rod 10.
• the lateral pin 74 of the piston rod 10 is equipped with sleeve bearings 75, which are free to roll along the internal circum ⁇ ference 77 of rings 76 and 73. This arrangement means that each cylinder takes up its own equilibrium angle of difference independently of the others. The pulling forces of the cylinders travel continually through the centre of the crankshaft. The ring series collects the cylinder forces and transfers the resultant force given by them to the crankshaft.
• the ring surfaces need not be continuous if the rings rotate, because the movement of the sleeves circumferentially is only 10° - 20°, depending on the case.
• the ring surfaces can be shaped to deviate from the cylindrical, if it is desired to advantageously alter the direction of the forces, among other things in order to even out the moment.
• FIGS. 19 and 20 show yet another radial piston eccentric motor, which corresponds to the case in section C of Figure 1.
• the same reference numbers as previously are used for operationally similar components, these being: case 1, hydraulic cylinder 4, its casing 11, piston 12, piston rod 10, and feed and return lines 18 and 18'.
• the eccentric force collector member is here located in the case and is formed of eccentric plate 20, the circum ⁇ ference surface of which is formed by rolling surface 83.
• the axle is straight and is marked by reference number 7 and the case is suspended from it by means of bearings 14 and 15, as previously.
• the force collector member 3 is mainly formed by the eccentric rolling ring surface 83.
• Ring plates 87 and 88 which carry the cylinder cases are attached to axle 7, their lower ends having specially formed end pieces 85. These include pins 80 adapted to the aforesaid ring plates 87 and 88. The cylinders 4 are free to swing on these pins 80.
• the lateral bar 86 attached to the pin 10 of the piston rod is able to move inside the above end piece 85 and it pulls the bridge piece 81 by means of the bolts 81. This is free to slide outside of the cylinder casing and has attached to it ball bearings 82, which are arranged to roll along the rolling surface 83 of the eccentric plate 20, which is attached to case 1.
• Auxiliary distribution plate 91 is installed inside axle 7 for the feed and removal of oil, in between feed plate 7 end plates 92 of distribution plate 6. The are locked in place by means of retaining rings 93. Auxiliary distribution plate 91 and distribution plate 6 are immovably attached to axle 7. Feed plate 7 on the other hand rotates with case 1, to which it is attached by means of plate 98 and axle 99. Pipes going through ring plate 87 are connected to distribution plates 6. Hoses 29, one end of which is connected to the feed connection of the cylinder are connected to the pipes on the outer circumference of the disc.
• FIG 21 shows the construction of the distribution plates in greater detail.
• the construction of feed plate 5 and distribution plate 6 corresponds essentially to the construction of the form of application in Figure 3.
• the feed plate 5 is, however, rotated by means of the axle and high-pressure oil is fed to it through the permanently attached auxiliary distribution plate 91.
• the feed and return pipes 18 and 18' are connected to the connections 95 and 95' of the auxiliary distribution plate 91. From these channels are led to concentric channels 96 and 96' on the opposite side.
• In feed plate 5 there are opposing eccentric channels 97 and 97', from which there are channels leading to the distribution level proper, in which there are feed and return grooves 23 and 23'.
• the distribution plate includes openings 25 that travels along the circumference of the grooves 23 of the distribution plate, and which lead to the feed pipe of each cylinder, these being connected to the connection 26.
• distribution plate 6 there are cylinder bores 24 on the opposite side, in which pistons are used in a manner corresponding to that in the form of application in Figure 3, which, when they are pressed against end plate 92, create an internal reaction force in the distribution plate, by means of which the distribution plate 6, the feed plate 5, the auxiliary distribution plate 91, and the opposing end plate 92 press tightly against one another.
• the critical component from the point of view of strength and durability i.e. the ball bearings that roll along the circumference surface 83, can be located on the outer circumference, and they can be made quite large without the size of the motor having to be increased on account of this.
• Figures 22 - 25 show another radial piston eccentric motor corresponding to the use in accordance with section C of Figure 1.
• the operationally similar components are given the same reference numbers as above in Figures 19 - 20, these being case 1, axle 7, ring plates 87 and 88, bearings 14 and 15, rolling ring surface 83, rolling bearings 82, hydraulic cylinder 4, its case 11, piston 12, piston rod 10, feed and return lines 18 and 18', distribution and feed plates 91, 5, and 6, feed plate turning axle 99, end plate 98, and connection hoses 29.
• the force collector member 3 is formed mainly of the eccentric rolling ring surface 83.
• each hydraulic cylinder 4 forms a mechanism implemented by means of the thrust cylinders, which pull together the rolling ring surface 83, locking case 1 and operational joints 80 connected to axle 7.
• the operational joint 80 is not formed by an actual pin held by bearings in a fixed place, but is formed by the combined action of the segment 104 of the sliding ring surface 107 attached to axle 7 and sliding shoe 106 attached to the hydraulic cylinder case 11.
• the operational joints 80 are brought closer to the centre line of axle 7 than when using ordinary joint bearings.
• Bridge piece 105 the protruding edges of the sides of which include the aforesaid sliding shoes 106, is attached to the lower end of case 11.
• axle 7 includes ring plates 87 and 88, the outer edges of which here include flanges 103.
• Internal segments 104 are attached to these at each cylinder.
• Pulling piece 111 which forms a bogie with sequential rolling bearings 82, gives a very large settling power to the sliding shoe 106 by means of the deterrnining sliding shoe of segment 104.
• bogie 111 gives considerable assistance to the joint to settle in a stable position.
• Some cylinder may suffer a loss of pressure because of a pipe fracture or other cause.
• a support ring which prevents them from detaching from segment 104, can be used beneath bridge pieces 105.
• Rolling bearings 82 are fitted to axle pins 110, which are attached to pulling piece 111, the lower part 112 of which rotates beneath the piston rod 10 and arch piece 113.
• Arch piece 113 creates such a form in the lower part 112 of pulling piece 111 that it carried all loads purely as tensile stress, and shear stress doe not appear at all.
• Axle pins 110 extend partly cut beside cylinder case 11 from the first rolling bearing 82 to the corresponding bearing on the other side, Figure 24. There is also a partly cut sleeve 120 set on top of axle pins 110, which prevents the upper part of pulling piece 111 from bending against one another.
• Each rolling ring surface 83 is formed of a ring attached eccentrically to plate 101.
• Plate 101 is secured to loops 109 of case 1 by means of adapted pins 108 and adjustment plates 89, which are further attached to one another by means of cover plate 100. The adjustment of the eccentric is described in greater detail later.
• a stepless gearbox can be very simply arranged for a motor of this kind by altering the length of stroke by means of internal eccentrics.
• Figure 25 shows the construction of an eccentric adjustment gearbox and three adjustment positions simplified. Part of case 1 and its loop 109 formed in the side plate are marked in the Figure. The adjustment eccentric ring 89 is set farthest out and once brake device 114 is released it is free to rotate inside case 1 round the centre point 119 of this. Inside the adjustment eccentric ring 89, against the sliding ring surface 116, is plate 101, which carries ring 102 forming rolling ring surface 83. Plate 101 includes pin 108 set in loop 109 of case 1, which prevents plate 101 from rotating in relation to the case.
• a particularly advantageous adjustment geometry is achieved by setting the centre point 117 of sliding ring surface 116 that lies against adjustment eccentric ring 89 to the side of the straight line between the pin 108 and the centre point 118 of the rolling ring surface 83.
• the figure shows, by means of an arrow against the rolling ring, the upper dead centre, the place of which varies but little in the adjustment region -51° - +51° of the adjustment eccentric ring.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)
• Hydraulic Motors (AREA)
• Transmission Devices (AREA)

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• 1991
  • 1991-06-11 FI FI912790A patent/FI912790A/fi not_active Application Discontinuation
  • 1991-11-11 PL PL29542491A patent/PL295424A1/xx unknown
  • 1991-11-11 JP JP3517699A patent/JPH07504243A/ja active Pending
  • 1991-11-11 WO PCT/FI1991/000338 patent/WO1992008892A1/en not_active Application Discontinuation
  • 1991-11-11 AU AU87580/91A patent/AU8758091A/en not_active Abandoned
  • 1991-11-11 EP EP91918720A patent/EP0557316A1/en not_active Withdrawn

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