NL1037790C2

NL1037790C2 - Mechanism for converting a reciprocating movement into a rotational movement and vice versa, device comprising such a mechanism, method of balancing such a mechanism or device.

Info

Publication number: NL1037790C2
Application number: NL1037790A
Authority: NL
Inventors: Jacob Vaalburg
Original assignee: Vaalburg Res B V
Priority date: 2009-03-09
Filing date: 2010-03-09
Publication date: 2010-12-27
Also published as: NL1037790A

Description

Mechanism for converting a reciprocating movement into a rotational movement and vice versa, device comprising such a mechanism, method of balancing such a mechanism or device.

5 This invention relates to a mechanism for converting a reciprocating movement into a rotational movement and vice versa, device comprising such a mechanism, method of making and use of such a mechanism or device. Application of such mechanisms is e.g. in (piston)engines, (piston)pumps, (piston)compressors, (valve)actuators, control and movements in automated fabrication processes, sawing machines, windscreen wiper drive mechanisms etc., etc.

10 Although the invention can be used for many applications e.g. as mentioned above, the invention will be described with reference to the application in the field of piston engines. The invention is however in no way limited to this application.

Prior art.

15

Such mechanisms or devices suitable for piston engines are e.g. known from EP-A-0 708 274.

In figure 20 of this document a conventional crank-connecting rod mechanism is shown. A major drawback of this mechanism is that the connecting rod does not move in a straight line but rather in a pendulum like way, thereby introducing extra vibrations and side forces on the 20 cylinder wall. Another drawback is the complicated form of the crankshaft which is therefore relatively expensive to produce.

Furthermore, this document describes a mechanism whereby the connecting rod is attached eccentrically to a gear wheel, the gear wheel being mounted on a crank and tumable in a stationary ring with internal teeth. Although the movement of the connecting rod is rectilinear, it 25 is not easy to install the ring with internal teeth in the engine block. Also the fabrication costs of such a ring are relatively high. Furthermore, a crankshaft is still needed which is complicated to make.

In US-A-4 077 267 several elliptical gear wheels are used, whereby a central elliptical wheel is kept in engagement with four other elliptical wheels (connected to the pistons) by means of 30 connecting links. Also in this embodiment extra vibrations due to the non linear motion but pendulum like movement of these links arise. Furthermore, the fabrication of the elliptical wheels is relatively complicated.

In FR-A-2 443 575 a connecting rod connects to a crankshaft to which latter a second crankshaft is connected via eccentrical gear wheels. Here, the connecting rod does not move 1 03 77 90 2 rectilinearly and a non favourable crankshaft is needed.

In FR-A-2 545 890 a connecting rod connects to a crank between two eccentrically arranged gear wheels with sliding bearings. These gear wheels are engaged with an eccentrical gear wheel having a fixed bearing and are kept into engagement with connecting elements which are 5 formed around the outer circumference of the eccentrical wheels. Apart from the enormous friction that occurs, the connecting elements do not move rectilinearly but like a pendulum and cause beside the connecting rods extra vibrations.

DE-A-3232974 describes a mechanism for converting a reciprocating movement into a rotational movement and vice versa, using at least three gearwheels one of which is freely rotateable 10 around the axis through its centre. One embodiments shows the connection of the wheels to three crankshafts, which are difficult to manufacture.

Another embodiment shows the freely rotateable wheel being provided at its rotational axis through its centre with a difficult to produce crankshaft. The other wheels are coupled in their rotation by further means in the form of a surrounding belt. This belt establishes only a frictional 15 connection between the wheels, which allows for slip of the belt and relative movement of the centres of the wheels with respect to each other, especially when the belt tension is decreasing due to wear, resulting in a malfunctioning of the mechanism.

Finally, DE-A-4430423 describes a similar mechansim using two excentrically rotating gear wheels, only one having a fixed excentrical rotating axis, whereby the wheels are kept engaged 20 by a connecting rod connecting the centres of the wheels. In one example it is described that a third gear wheel can be arranged for guiding the freely roataing wheel. How this third wheel is kept engaged with the other wheels is not disclosed and it is even recommended not to use three (or more) wheels. Other embodiments show rods with grooves in which pins are guided which result in enormous frictional losses. Always connections are provided at the rotational axis 25 through the centre of the freely rotating wheel resulting in limitations to connect the reciprocating member at both sides of the freely rotating wheel.

Object of the invention 30 The object of the invention is to realize a mechanism and a device for converting a reciprocating movement into a rotational movement and vice versa, a method of making and use of such a mechanism or device , such that at least one of the above drawbacks or complications is obviated or reduced.

3

Solution

These objects are achieved with a mechanism according to claims 1 and 2 and/or a method of balancing according to claim 14.

5 Especially, when starting from a mechanism according to the prior art as described in DE-A-4430423 the objects are achieved with the characterising features of claims 1 and 2.

Especially, because the second and third wheels are also positively coupled by further means, a reliable engagement of all wheels is achieved, whereby the position of the centres of the wheels 10 is kept at all times and disengagement of the second and third wheels from the first wheel is obviated.

Because the further means rotate together with the second and third wheels, the friction in the mechanism is kept to a minimum.

As an alternative solution magnetism can be used in order to keep the wheels engaged e.g. the 15 wheels could be magnetised so that they attract each other.

Preferably, several means for rotateable connection with rectilinear reciprocating members are arranged such that at least two means follow perpendicular rectilinear reciprocating movements. With this arrangement balancing of the mechanism connected to reciprocating members 20 becomes very easy.

Prefereably, the further means can be formed by centrical and/or excentrical gearwheels or ring gears. Also a chain, a toothed belt, hypoid gear wheels or any other transmission using positive engagement (different from frictional engagement) can be used. Also a simple rod e.g. with holes at its ends rotateably and positively connecting to shaft stubs on e.g. the second and third wheels 25 can be thought of.

In particular the wheels have a toothing which can be helical and preferably is a symmetrical helical toothing, e.g. a fish-bone toothing.

30 Preferably, the centres of the wheels stay arranged on a straight line during motion. With this arrangement embodiments can have a relatively small height.

The mechanism can be used in all kind of devices.

It can for example be used in a device like an engine, a pump, a compressor or combinations 4 thereof, whereby the rotational axis of the first wheel or both rotational axis of the second and third wheels are connected to at least one piston, possibly via a connecting rod, whereby preferably the connecting rod is fixedly mounted to or integral with the at least one piston, whereby the at least one pistons is arranged in at least one cylinder. Because the pistons do not 5 need to be hingely connected, a complicated hinge connection as used in conventional engines between connecting rod and piston can be obviated. Not only the piston(s) but also the connecting rods do make a pure rectilinear reciprocating movement. Vibrations causing noise and powerloss are herewith strongly reduced or even obviated.

Preferably, the device comprises means for cooling and/or lubrication, whereby in particular the 10 reciprocating parts comprised of the connecting rod and/or the piston have a channel for cooling and/or lubrication purposes.

Preferably, the compression ratio is adjustable by varying the position of the rotational axis (and thus the bearings) of the second and third wheels in the chassis of the device (or of the axis of the first wheel in the chassis, in case this axis has a fixed bearing) with respect to the position of 15 for example the cylinders.

Preferably, the compression ratio is adjustable by varying the distance between the rotational axis of the first wheel and the side of the at least one piston facing away from the first wheel or the distance between the rotational axis of the second and third wheel and the side of the at least one piston facing away from these wheels. This can be realized relatively easily, as the 20 reciprocating movement of the connecting rod and piston is purely rectilinear.

Preferably, the second and third wheels are mounted on straight shafts, whereby preferably along their length several second and third wheels are arranged with a different orientation with respect to each other. With this construction it is possible to combine several mechanisms having simple straight shafts and to fabricate embodiments in which vibrations of the mechanisms are balanced 25 or reduced.

By using straight shafts standard bearings can be applied. The bearing rings do not have to be split like the main bearings and big end bearings on the cranks of a crankshaft in a conventional engine. The use of ball bearings and roller bearings is therefore extremely advantageous. These 30 bearings have as a further advantage, that the efficiency is much higher than conventional hydrodynamic sliding bearings, especially with low temperatures and/or high rotational speeds. Furthermore, the mounting is substantially simplified because the bearings can be simply pushed over the straight shafts.

5

With the device according to the invention wear and internal friction are reduced to a minimum. The movement and the position of the engagement point of the connecting rod, in particular the eccentrical rotational axis of the first wheel, is dynamically determined. This engagement point, or this eccentrical rotational axis, makes a rectilinear reciprocating movement which is strictly 5 determined by the turning and the position of the second and third wheels. Side forces introduced by the connecting rod on the piston and thus side forces from the piston perpendicular to its rectilinear movement on the cylinder wall as in conventional engines are therefore not present in devices according to the invention.

The pistons will reciprocate purely rectilinearly, and not as in conventional engines, slap against 10 the cylinder walls due to changing side forces. Since the so called piston slap is not present, the noise produced will be lower.

For mechanisms according to the invention standard gear wheels, preferably with symmetrical helical teeth, can be used. The helical teeth help to reduce noise. With symmetrical teeth no side 15 forces are introduced by the teeth on the wheels during rotation.

Beside the standard gear wheels, simple straight shafts can be used, so that complicated crankshafts are redundant. Also complicated connecting rods and hinge connections of the pistons are not needed. The production costs are therefore substantially reduced.

When standard round gear wheels are used they can have a bearing or shaft arranged at 20 excentrical rotational axis i.e. axis which do not coincide with the centres of the wheels.

Such wheels can be easily balanced with respect to their rotational axis for example by adding extra mass on the wheel or by taking away mass at the side of the centre of the wheel.

By correctly balancing the wheels and/or the shafts on which the wheels are mounted vibrations in a mechanism or a device according to the invention can be reduced to a minimum. Further 25 seperate balancing shafts as often used in conventional engines are therefore not necessary anymore. With a symmetrical arrangement of the pistons vibrations of the reciprocating mass can also be eliminated. Therefore also the flywheel mass can be minimized.

The mechanisms and devices according to the invention have minimal vibrations and reduced wear which makes them very suitable for high revolutional speeds.

30 Normally, in the device according to the invention the rotational axis of the second and third wheels have a fixed bearing on a fixed chassis, whereas the eccentrical rotational axis of the first wheel reciprocates. At the axis of the second and third wheels the rotational input and/or output is arranged. A rectilinear drive or driven element engages the eccentrical rotational axis of the first wheel.

6

Of course, also the excentrical rotational axis of the first wheel can have a bearing on a fixed chassis and the eccentrical rotational axis of the second and third wheels can have a bearing on a moveable chassis part that reciprocates with respect to the fixed chassis. In this case a rectilinear drive or driven element engages the movable chassis part with thereon the bearings of the 5 rotational axis of the second and third wheels. The rotational input and /or output is then arranged at the first rotational axis.

The reciprocating part (with one or two wheels) is for efficiency reasons and depending on the circumstances made as light as possible and e.g. made of a relatively light metal, titanium, carbonfiber material or combinations of these materials.

10 When the wheels have positively engaging teeth there belongs to every position of the wheels only one predetermined position of the pistons, so that the mechanism is kinematically determined.

Slipping of the wheels is then impossible, so that the transmission of high power is possible.

15 The invention will now be explained with examples of embodiments according to the invention and will be described by using the following figures: figures la-lc, mechanism according to the invention figure 2a, coupling of the wheels (2,3) by means of the first wheel (1) and the wheels (1',2',3') figure 2b, coupling of the wheels (2,3) and wheels (2',3') by means of rods S 20 figure 3a, mechanism with a piston for e.g. Straight engines figures3b, two mechanisms coupled for V-engines figure 3c, mechanism with two pistons for boxer engines figure 3d, two mechanisms coupled with two pistons figure 3e, mechanism with piston reciprocating under different angles 25 figure 3f, mechanism with two wheels rotateably connected to a connecting rod with two pistons figure 3g, mechanism with four pistons and four wheels figure 3h, mechanism with three pistons and a ring gear figure 3i, mechanism with two set of pistons reciprocating perpendicularly, using a ring gear figure 4, several mechanisms with two pistons arranged next to each other (8 cylinder boxer) 30 figure 5, device according to the invention with variable compression ratio and cooling and/or lubrication.

In figures la-lca mechanism according to the invention is shown, comprising a first wheel (1) arranged between a second wheel (2) and a third wheel (3). The wheels have a radius r and at the 7 eccentrical rotational axis (lb,2b,3b) of the wheels shafts or bearings are arranged with an eccentricity e with respect to the centres (la,2a,3a) of the wheels. The eccentrical rotational axis (2b,3b) of the second and third wheels (2,3) are fixed at a constant distance 4r (see figure lc). The angular velocity of the second and third wheels (2,3) is the same but opposite to the angular 5 velocity of the first wheel (1).

Figures la-lc show three consecutive orientations of the wheels (1,2,3) respectively for angles phi=0,45 and 90 degrees when the wheels rotate from phi=0 to 360 degrees.

In figure la the position of the eccentrical rotational axis (lb) is at its most right position. When the wheels rotate to the position in figure lb, the eccentrical rotational axis (lb) has moved to the 10 left, whereas in figure lc the position of the eccentrical rotational axis (lb) has moved exactly to the middle between the eccentrical rotational axis (2b,3b) (point x). When the wheels rotate further the eccentrical rotational axis (lb) will be moved towards the most left position at phi is 180 degrees, and will be moved to the point x again when phi is 270 degrees. At phi is 360 degrees the eccentrical rotational axis (lb) is back at its most right position as for phi is 0 15 degrees.

Thus when the wheels rotate, the rotational axis (lb) reciprocates horizontally between the axis (2b,3b) with an amplitude 2e about the point x. The stroke of the rotational axis (lb) equals 4e. The first wheel rotates thereby around its centre (la), whereas the centre (la) rotates with a 20 radius e around the point x. For every angle phi the centre (la) lies on the horizontal line through the centres (2a,3a) of the second and third wheels (2,3). Thus during rotation the centres (la,2a,3a) of the wheels (1,2,3) do always stay arranged on a straight line.

The distance s between the rotational axis (lb,2b) of the first and second wheels and the distance between the rotational axis (lb,3b) of the first and and third wheels satisfies the formula s=2r-25 2e*cos(phi), in which phi is the rotational angle of the wheels.

Similar movements apply to other rotational axis (1 b') and (1 b") of the first wheel which, just like the rotational axis (lb), are located on a circle with radius e and with a centre (la), as indicated in figure lc. The rotational axis (lb') is shifted 180 degrees with respect to the axis (lb). When the wheels rotate, the rotational axis (lb') reciprocates vertically, under an angle of 30 90 degrees with the line between the rotational axis (2b) and (3b). A rotational axis (lb") located between the rotational axis (lb) and (lb') reciprocates along a rectilinear line (dashed line in figure lc) which makes an angle alpha with the line through the rotational axis (2b) and (3b) and which crosses the line through the rotational axis (2b) and (3b) in the middle at point x.

The wheels (1,2,3) are preferably of the same dimensions. The wheels are preferably standard 8 gear wheels with the same radius r. The wheels have preferably helical teeth. The helical teeth are preferably symmetrical with respect to a plane perpendicular to the rotational axis that divides the thickness of the wheel in two identical halves, e.g. as with fish bone toothing. In this manner, there are no side forces working on the wheels.

5

The wheels (2,3) are - apart from being connected via a the first wheel (1)- connected via further means, such that these wheels have always the same orientation and angular speed (see figure 2a). In this embodiment the further means are realized with centrical wheels (T,2',3') (i.e. wheels mounted rotatable at their centres) of the same dimensions. All the wheels, except the first wheel 10 (1) have in this case a fixed bearing on the chassis.

In embodiments in which the wheels (2,3) or (2',3') are attached at the ends of the shafts at the rotational axis (2b) or (3b), the further means can be realized with a simple rod S (see figure 2b). It also possible to realize the further means by means of excentrical gear wheels, i.e. gear wheels mounted rotatable about an eccentrical axis, such as for example with a second mechanism 15 according to the invention, as shown in figure 4.

In figure 4 four mechanisms I-IV are shown, each having a connecting rod (4). To each connecting rod (4) two pistons are connected (in the figure only the connecting rod (4) of the upper mechanism I is shown). Even when only two mechanisms Ι,Π are coupled next to each other, the second and third wheels of the first mechanism I are, apart from being coupled via the 20 first wheel of the first connecting rod, coupled via the first, second and third wheels of the second mechanism II, such that the second and third wheels of both mechanisms can never disengage.

The connecting rods are shown with grooves through which the wheels can pass. Also grooves perpendicular to the plane of he drawing are arranged here, so that the shafts at the rotational 25 axis (2b) and (3b) can pass through the rods. In some arrangements the connecting rods could be guided in these grooves. With the connecting rods extending on both sides of the first wheels, forces between the excentrical rotational shafts (lb) of the first wheels and the connecting rods can be transferred symetrically with respect to the central axis of the connecting rods, so that no couple is induced on the rods.

30 In figures 3a-3d examples are shown of different embodiments of devices according to the invention, which are in particular suitable for straight engines (figures 3a,3e), V- engines (figures 3b,3e), boxer engines (figures 3c,3d,3f,3g) or star engines (figures 3h,3i).

In these embodiments the first wheel (1) is rotatably connected to connecting rod (4) at an eccentrical rotational axis (lb) e.g. by means of a bearing or shaft. In the examples the 9 connecting rod (4) is non hingedly connected to a piston (5) or two pistons (5,6). The pistons are respectively guided in a cylinder (7) or cylinders (7,8). The first wheel (1) is always arranged between a second and third eccentrical wheel (2,3) which have eccentrical rotational axis (2b,3b), at which axis (2b,3b) the wheels have a fixed bearing on a chassis. When transmission 5 chains or belts are used to drive a camshaft of the engine, these chains or belts can also be used as the further means for coupling the second and third wheels (2,3) in their rotation.

In figures 3a-3c the rotational axis of the wheels cross the line of symmetry of the cylinders.

In figure 3d the rotational axis of the wheels cross a line parallel to the lines of symmetry of the cylinders. In this embodiment, possible unbalance between the axis is cancelled out and side 10 forces in particular perpendicular to the movement of the pistons are completely obviated. Also the connecting rod can be kept short such that the cylinders can be arranged between the wheels. The rotational axis (2b,3b) can then be arranged in the vicinity of the cylinderheads, so that possibly present overhead camshafts can be driven directly with further gear wheel transmissions. Transmission chains or belts are then not needed anymore.

15 In figures 3a-3c, the connecting rods (4) can also be arranged parallel to and completely next to the line that crosses the axis (2b) and (3b) perpendicularly. A groove or slot in the connecting rods for the axis (2b) and (3b) is then not necessary, so that the assembly of the device is simplified.

In the embodiment according to figure 3e the connecting rod is attached to the rotational axis 20 (lb'), such that the piston reciprocates vertically. With this construction the length of the connecting rod can be minimized. Furthermore, the connecting rod can be extended like in figure 3c, so that two pistons can act on the connecting rod.

The choice of rotational axis (lb,lb',lb") where the connecting rod is rotatably connected to the first wheel determines the angle alpha of the reciprocating movement with respect to the line 25 through the rotational axis (2b,3b). The connecting rod can be connected to the first wheel at any rotational axis (lb”) between the axis (lb) and (lb') and lying on the circle with radius r and centre (la). The angle alpha can therefore be chosen according to the circumstances, which allows for a flexible design.

Figure 3f shows an embodiment having further means in the form of a gear wheel (Γ) whereby 30 two wheels (1,1') are rotateaby connected to one connecting rod. The connecting rod is guided in a very stable manner, so that the pistons can act with a minimum force on the cilinder walls (not shown).

Figure 3g shows a similar embodiment with four pistons using only four wheels.

Figure 3h shows an embodiment comprising futher means in the form of a gear ring (14), the 10 mechanism having only one fixed rotational axis (lb). One connecting rod is connected to two wheels (2,3). The vertical connecting rod could be extended so as to be guided by a shaft at the axis (lb).

Figure 3i also shows an embodiment comprising a gear ring used as further means, the 5 mechanism having only one fixed rotational axis (lb). The connecting rods of the vertically reciprocating pistons can e.g. be connected at the front of the wheel (1) and connecting rods of the horizontally recipocating pistons can e g. be connected behind the wheel (1). This embodiment is particularly easy to balance with only one mass on the first wheel counter balancing the forces of the connecting rods and pistons.

10 Also the mechanisms of all other embodiments can be easily balanced even when used alone. In case there is no set of connecting rods whereby the rods move in perpendicular directions the balancing can be easily achieved by the method comprising amongst others the step of mounting a counter balancing mass at a location on the at least one wheel which is provided with the means for rotateable connection with a rectilinear reciprocating member, whereby said 15 location and the means for rotateable connection with a rectilinear reciprocating member are point symmetrical with respect to the centre of the at least one wheel (1,2,3). Furthermore, mass can be added with respect to at least one fixedly rotateble shaft, preferably on an excentrically mounted wheel on that shaft at the side opposite of the centre, or by taking away mass at the side of the centre of the wheel.

20

The devices as described with reference to figures 3a-3i can be arranged alone or in any combination next to each other. By arranging embodiments next to each other balancing can often already be achieved without adding balancing masses.

25 In figure 4 an example of this is shown, with several devices according to figure 3c placed next to each other. Forces and moments due to the reciprocating movements are balanced and thus vibrations are kept to a minimum.

In the figure it is clearly shown, that the axis (lb,2b,3b) coincide with simple straight shafts. On the shafts the gear wheels are mounted with shifted angles with respect to each other. The second 30 and third gear wheels of the first and fourth mechanism (I,IV) are shifted 180 degrees with respect to the second and third wheels of the second and third mechanism (Π,ΙΙΙ). When the pistons of the mechanisms I and IV move to the right, the pistons of the mechanisms II and III move to the left and vice versa.

Because of the purely rectilinear reciprocating movement of the connecting rod, it is relatively 11 easy to vary even during the motion the length of the connecting rod or to adjust the piston relatively to the connecting rod so that the compression ratio can be varied. Furthermore, it is relatively easy to arrange a cooling and/or lubrication for the bearing of the first wheel on the connecting rod and/or the pistons.

5 An example hereof is shown in figure 5. An axial piston pump (10) pumps oil into the hollow connecting rod (4), so that oil can flow from the pump (10) to the rotational axis (lb) and the piston for cooling and lubrication, whereby in this case the piston of the pump is formed by the connecting rod (4) itself. The connecting rod is composed of two parts which are connected by a screw thread (4'). By turning the left connecting rod part (4") by means of a rack mechanism (9), 10 this part will be axially adjusted with respect to the right connecting rod part. Thus the length between the rotational axis (lb) of the first wheel and the piston (5) is varied, so that the compressed volume and as a consequence the compression ratio will be varied. The length can of course also be varied hydraulically or electromagnetically.

Furthermore, the compression ratio can be varied by varying the position of the bearings of the 15 axis (2b) and (3b) on the fixed chassis (or of the axis (lb) on the fixed chassis, in case this axis has a fixed bearing therein) with respect to the position of the cylinders (7,8). This is indicated with arrow P in figure 5.

What is claimed is: 20 1. Mechanism for converting a reciprocating movement into a rotational movement and vice versa, the mechanism comprising at least three wheels (1,2,3) working together, at least a first wheel (1) with a centre (la) which wheel is rotatable around a first excentrical rotational axis (lb,lb',lb”) and at least second and third wheels (2,3) with respective second and third centres (2a,3a) which wheels are 25 rotatable around respective second and third excentrical rotational axis (2b,3b), whereby the first wheel (1) is arranged with respect to the second and third wheels (2,3) such that during rotation of the wheels (1,2,3) the position of the centres (la,2a,3a) of the wheels with respect to each other stays the same and the excentrical rotational axis (lb, lb', lb") of the first wheel (1) reciprocates rectilinearly with 30 respect to the excentrical rotational axis (2b,3b) of the second and third wheels (2,3); the second and third wheels (2,3) being positively coupled in their rotation via the first wheel (i); at least one wheel (1,2,3) is provided with means for rotateable connection with a rectilinear reciprocating member at a location of a crossing with at least one of its excentrical rotational 12 axis (lb,lb',2b,3b) and the at least one wheel being rotateable around an axis through its centre (la,2a,3a), characterized in that, the second and third wheels (2,3) are also positively coupled in their rotation via further means 5 (1',2-,3',14), and the at least one wheel (1,2,3) which is provided with means for rotateable connection with a rectilinear reciprocating member is not provided with means for a rotateable connection at the axis through its centre (la,2a,3a).

10 2. Mechanism for conversion of a reciprocating movement into a rotational movement and vice versa, the mechanism comprising at least three wheels (1,2,3) working together, at least a first excentrical wheel (1) with a centre (la) which wheel is rotatable around a first excentrical rotational axis (lb,lb',lb”) and at least second and third wheels (2,3) with respective second and third centres (2a,3a) which wheels are 15 rotatable around respective second and third excentrical rotational axis (2b,3b), whereby the first wheel (1) is arranged with respect to the second and third wheels (2,3) such that during rotation of the wheels (1,2,3) the position of the centres (la,2a,3a) of the wheels with respect to each other stays the same and the excentrical rotational axis (lb, lb', lb") of the first wheel (1) reciprocates rectilinearly with 20 respect to the excentrical rotational axis (2b,3b) of the second and third wheels (2,3); the second and third wheels (2,3) being positively coupled in their rotation via the first wheel (i); at least one wheel (1,2,3) is provided with means for rotateble connection with a rectilinear reciprocating member at a location of the crossing with at least one of its excentrical rotational 25 axis (lb,2b,3b) and the at least one wheel being rotateable around an axis through its centre (la,2a,3a), characterized in that, at least two wheels are coupled by means of magnetism, so that the wheels can not disengage from each other.

30 3.Mechanism according to claim 1 or 2, characterized in that, several means for rotateable connection with rectilinear reciprocating members are arranged such that at least two means follow perpendicular rectilinear reciprocating movements.

13 4.Mechanism according to claim 1, characterized in that the further means (Γ,2',3',14) are formed by centrical gear wheels and/or excentrical gearwheels, by hypoid gear wheels, a ring gear, a toothed belt, a chain or a rod.

5 5.Mechanism according to at least one of the preceding claims, characterized in that the wheels have a toothing, preferably a helical toothing, which is especially symmetrical.

6. Mechanism according to at least one of the preceding claims, characterized in that the centres (la,2a,3a) of the wheels (1,2,3) stay arranged on a straight line.

10 7. Device comprising at least one mechanism according to at least one of the preceding claims Ι ό.

8. Device, for example an engine, a pump, a compressor or combination thereof, according to 15 claim 7, whereby the rotational axis of the first wheel (lb, lb', lb") or both rotational axis (2b,3b) of the second and third wheels are connected to at least one piston (5,6) preferably via a connecting rod (4), whereby preferably the connecting rod is fixedly mounted to or integral with at least one piston (5,6), whereby the at least one piston is arranged in at least one cylinder (7,8).

20 9. Device according to claim 8, characterized in that, the connecting rod (4) comprises two open grooves perpendicular to each, the first groove for allowing a shaft to pass through and the second groove for allowing a gear wheel, perpendicularly arranged to the shaft, to pass through.

25 10. Device according to claim 8 or claim 9, characterized in that the connecting rod and/or the piston have a channel for cooling and/or lubrication.

11. Device according to at least one of claims 8-10, characterized in that the compression ratio is 30 adjustable by varying the position of the bearings of the axis (2b,3b) of the second and third wheels in the chassis of the device (or of the axis (lb) of the first wheel in the chassis, in case this axis has a fixed bearing) with respect to the position of for example the cylinders (7,8).

12. Device according to at least one of claims 8-11, characterized in that the compression ratio is 14 adjustable by varying the distance between the rotational axis of the first wheel (lb,lb',lb") and the side of the at least one piston facing away from the first wheel (or the distance between the rotational axis of the second and third wheel and the side of the at least one piston facing away from these wheels (2,3), when the axis (lb) has a fixed bearing).

5 13. Device according to at least one of claims 7-12, characterized in that, the second and third wheels are mounted on straight shafts, whereby along their length several second or third wheels (2,3) are arranged preferably with a different angular orientation with respect to each other.

10 14. Method of balancing the mechanism according to least one of claims 1-6 or the device according to at least one of claims 7-13, comprising amongst others the step of mounting a counter balancing mass at a location on the at least one wheel which is provided with the means for rotateable connection with a rectilinear reciprocating member, whereby said 15 location and the means for rotateable connection with a rectilinear reciprocating member are point symmetrical with respect to the centre of the at least one wheel (1,2,3) and the step of adding mass with respect to at least one fixedly rotateble shaft, preferably on an excentrically mounted wheel on that shaft at the side opposite of the centre or by taking away mass at the side of the centre of the wheel.

20 25 30 103 77 90

Claims

1. Mechanism for converting a reciprocating movement into a rotating movement and vice versa without crankshaft, the mechanism comprising at least three co-operating wheels (1,2,3), with at least a first wheel (1) with center ( 1 a) which is rotatable about a first eccentric axis of rotation (lb, lb ', lb ") and at least second and third wheels (2,3) with respective second and third centers (2a, 3a), which wheels are rotatable about second and third third eccentric axes of rotation (2b, 3b), the first wheel (1) being arranged relative to the second and third wheels (2,3) such that during rotation of the wheels (1,2,3) the position of the center points (1a, 2a, 3a) of the wheels remains the same relative to each other and the eccentric axis of rotation (1b, 1b ', 1b ") of the first wheel (1) reciprocates linearly with respect to the eccentric axis of rotation (2b, 3b) of the second and third wheels (2,3); the second and third wheels (2, 3) are formally coupled in their rotation via the first wheel (1); at least one wheel (1,2,3) is provided with means for a rotatable connection with a linear reciprocating part at the location of an intersection of at least one of its eccentric rotary axes (1b, 1b ', 2b, 3b) and the at least one wheel is rotatable about an axis through its center point (1a, 2a, 3a), characterized in that the second and third wheels (2, 3) are also form-locked in rotation via further means (1, 2 ', 3') , 14), and the at least one wheel (1,2,3) provided with the means for a rotatable connection to a reciprocating part is not provided with means for a rotatable connection at the axis through its center point (1a, 2a, 3a).

2. Mechanism for converting a reciprocating movement into a rotating movement and vice versa without crankshaft, the mechanism comprising at least three cooperating wheels (1,2,3), with at least a first wheel (1) with center ( la) that is rotatable about a first eccentric axis of rotation (lb, lb ', lb ") and at least second and third wheels (2,3) with respective second and third centers (2a, 3a), which wheels are rotatable about second and third eccentric axes of rotation (2b, 3b), wherein the first wheel (1) is arranged relative to the second and third wheels (2,3) such that during rotation of the wheels (1,2,3) the position of the centers (1a, 2a, 3a) of the wheels remains the same relative to each other and the eccentric axis of rotation (1b, 1b ', 1b ") of the first wheel (1) reciprocates linearly with respect to the eccentric axis of rotation (2b, 3b) of the second and third wheels (2,3); The second and third wheels (2, 3) are formally coupled in their rotation via the first wheel (1); at least one wheel (1,2,3) is provided with means for a rotatable connection with a linear reciprocating part at the location of an intersection of at least one of its eccentric rotary axes (1b, 1b ', 2b, 3b) and the at least one wheel is rotatable about an axis through its center (1a, 2a, 3a), characterized in that at least two wheels are coupled by means of magnetism, so that the wheels cannot become detached from each other.

3. Mechanism as claimed in claim 1 or 2, characterized in that a plurality of means for a rotatable connection with linear reciprocating parts are arranged so that at least two means follow perpendicular linear reciprocating movements.

Mechanism according to claim 1, characterized in that the further means (1 ', 2', 3 ', 14) are formed by centric and / or eccentric gears, by hypoid gears, an annular gear, a toothed belt, a chain or a rod. 15

Mechanism according to at least one of the preceding claims, characterized in that the wheels have a toothing, which is preferably slanted and which is in particular symmetrical.

Mechanism according to at least one of the preceding claims, characterized in that the centers (1a, 2a, 3a) of the wheels (1,2,3) remain positioned in a straight line.

Device provided with at least one mechanism according to at least one of the preceding claims 1-6. 25

Device, for example a motor, a pump, a compressor or a combination thereof, according to claim 7, wherein the axis of rotation (1b, 1b ', 1b ") of the first wheel or the two axis of rotation (2b, 3b) of the second and third wheels is connected to at least one piston (5, 6), preferably via a piston rod, the piston rod preferably being rigidly connected or integral with the at least one piston, and wherein the at least one piston in at least one cylinder (7) , 8).

Device as claimed in claim 8, characterized in that the piston rod (4) has two open grooves which are perpendicular to each other, the first groove for passing through an axis and the second groove for a gear wheel perpendicular to the shaft, by letting.

Device as claimed in claim 8 or 9, characterized in that the piston rod and / or the piston are provided with channels for lubrication and / or cooling. 5

Device according to at least one of claims 8-10, characterized in that the compression ratio is adjustable by the position of the rotational axes (2b, 3b) of the second and third wheels (2,3) in the chassis of the device ( or vary the axle (lb) of the first wheel in the chassis, in the case that this axle has a fixed bearing) with respect to, for example, the position of the cylinders (7,8).

Device according to at least one of claims 8 to 11, characterized in that the compression ratio is adjustable by varying the distance between the axis of rotation (lb, lb ', lb ") of the first wheel and the distance away from the first wheel side of the at least one piston (or the distance between the axis of rotation of the second and third wheel, respectively, and the side of the at least one piston remote from these wheels, in the case that the shaft (1b) is fixedly mounted).

13. Device as claimed in at least one of claims 7-12, characterized in that the second and third wheels are mounted on straight axes, wherein a plurality of second or third wheels (2,3) on them along their length, preferably with an angular rotation be arranged relative to each other.

14. Mechanism according to at least one of claims 1-6 or device according to at least one of claims 7-13, characterized in that a counterweight at a location on the at least one wheel (1,2,3), which is provided with means for rotatable connection to a linear reciprocating part, which location and the means for rotatable connection to a linear reciprocating part point are symmetrical with respect to the center point (1a, 2a, 3a) of the at least one wheel and that weight relative to at least one fixed rotating shaft can be added, preferably on an eccentric wheel mounted on that shaft on the side opposite the side of the center, or weight can be removed on the side of the center of that center wheel.