EP0006915A1

EP0006915A1 - Rotary pistons machine

Info

Publication number: EP0006915A1
Application number: EP78900126A
Authority: EP
Inventors: Istvan Simon
Original assignee: Individual
Current assignee: Individual
Priority date: 1977-09-23
Filing date: 1979-04-09
Publication date: 1980-01-23
Also published as: US4311442A; WO1979000157A1; JPS5537587A; CH622582A5

Abstract

Dans une machine a pistons rotatifs comprenant un carter cylindrique et un arbre d'entrainement coaxial, le carter (5, 18, 19, 20, 21) est muni d'une chambre de rotation, dans laquelle sont disposes trois pistons rotatifs (15, 16, 17) en forme de secteur et pourvus de joints d'etancheite. Ces pistons sont juxtaposes et ont des vitesses angulaires a variation periodique de sorte que des volumes de travail dont la grandeur change periodiquement se forment entre les pistons rotatifs. A cet effet, l'arbre d'entrainement (1) comprend une came excentrique (1a) qui supporte un disque d'entrainement rotatif (3) a denture interieure (3a). Cette denture interieure (3a) s'engrene sur une roue dentee droite (4). Le disque rotatif (3) supporte des broches d'entrainement (8, 11, 14) qui sont chacune en liaison operationnelle avec un levier (7, 10, 13) et qui sont chacune reliees rigidement a un piston rotatif (15, 16, 17) par l'intermediaire d'un arbre creux (6, 9, 12).In a rotary piston machine comprising a cylindrical casing and a coaxial drive shaft, the casing (5, 18, 19, 20, 21) is provided with a rotation chamber, in which three rotary pistons (15, 16, 17) in the shape of a sector and provided with seals. These pistons are juxtaposed and have periodically varying angular velocities so that working volumes of periodically changing magnitude are formed between the rotating pistons. For this purpose, the drive shaft (1) comprises an eccentric cam (1a) which supports a rotating drive disc (3) with internal teeth (3a). This internal toothing (3a) meshes with a straight toothed wheel (4). The rotating disc (3) supports drive pins (8, 11, 14) which are each in operative connection with a lever (7, 10, 13) and which are each rigidly connected to a rotating piston (15, 16, 17) via a hollow shaft (6, 9, 12).

Description

Rotary lobe machine

The invention relates to a rotary piston machine with a cylinder-like housing and a shaft lying in the cylinder axis.

In the known rotary lobe machines, e.g. CH-PS 338'326, 369'623, US-PS 3.108.578, 3.246.835, 3.288.121, GB-PS 961.872 and 1.000.418, the working spaces have a crescent-like shape and the pistons partially roll

Movements, which makes sealing very difficult and poses almost insurmountable problems.

The problem therefore arose of creating a rotary lobe machine with work spaces which have a relatively favorable ratio between volume and surface area and are well sealed.

The rotary lobe machine according to the invention represents a solution to this problem and it is "characterized in that the housing encloses a rotation cavity in which at least two sector-like rotary lobes with angular velocities that change periodically with respect to one another are arranged one after the other, so that between the rotary piston form working spaces, the volume of which changes periodically, that the drive shaft carries an eccentric cam on which is mounted a rotating drive disk provided with internal toothing, the internal toothing of which is connected to a spur gear which is fixedly connected to the housing and coaxial with the drive shaft intervenes that the driving disk carries driving bolts, which are each operatively connected to a rotary piston lever and each rotary piston lever is connected non-rotatably to one of the rotary pistons via a hollow shaft lying coaxially with the drive shaft, and that the rotary pistons move in both radial directions and in both directions Axial directions are provided with seals.

OMP1 A <> »WW11PPOO _, &>> An exemplary embodiment of the object of the invention is shown in the drawing. Show it:

FIG. 1 shows a vertical longitudinal section through the rotary piston machine,

FIG. 2 shows a horizontal section along the line II-II in FIG. 1 through the rotary piston machine, but with a section through the tongues of two rotary pistons,

FIG. 3 shows a cross section along the line III-III in FIG. 1, with a view of the drive plate,

FIG. 4 shows a cross section along the line IV-IV in FIG. 1, with a view of the piston lever,

FIG. 5 shows a cross section along the line V-V in FIG. 1, with a view of the rotary pistons,

FIG. 6 shows a view of the rotary piston with the outer hollow shaft, transverse to the axis,

FIG. 7 shows a floor plan for FIG. 6,

8 shows a view of the rotary piston for the central hollow shaft, transverse to the axis,

FIG. 9 shows a view of the rotary piston for the inner hollow shaft, transverse to the axis,

FIG. 10 shows the rotary piston of FIG. 9 with cutouts for the sealing elements, seen in the axial direction,

FIG. 11 the same rotary piston with attached sealing elements, seen in the axial direction,

FIG. 12 shows a section through the inner seal along the line XII-XII in FIG. 11, on a larger scale,

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OMP ^WIP FIG. 13 shows a floor plan for FIG. 12,

FIG. 14 shows a section through the outer seal along the line XIV-XIV in FIG. 11, on a larger scale,

FIG. 15 shows a side view of FIG. 14,

FIG. 16 shows a top view of the seal of FIG. 14,

FIG. 17, a rod seal,

FIG. 18 shows a cross section through the same,

Figures 19 to 22 schematically the adjustment of the rotary pistons to each other, or from each other by the drive plate, and

Figures 19a to 22a schematically the four-stroke process of a rotary piston internal combustion engine.

The rotary lobe machine shown in FIGS. 1 and 2 has an easily producible, cylinder-like housing 5, 18-21, in whose horizontal axis a drive shaft 1 is mounted. The rotary piston machine is provided as a four-stroke engine and is designed as an internal combustion engine according to FIGS. 19a to 22a. The housing 5, 18-21 delimits a cylindrical rotation space with a jacket part 18, an inner pressure wall 19 and an outer end wall 21. In this three sector-like rotary pistons 15, 16, 17 are accommodated one behind the other in their running direction around the drive shaft 1, which have angular speeds that change periodically with respect to one another. The working spaces remaining between the rotary pistons 15, 16, 17 (FIGS. 19-22) are enlarged and reduced as a result of the periodically changing angular velocities, corresponding to the working volume of known piston engines.

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OMPI The drive shaft 1 carries an eccentric cam la, on which a radial ball bearing 2 is inserted. The outer ring of the same sits in a recess of a driving disk 3, which is provided with an internal toothing 3a on its flange. This engages in the toothing 4a of a pinion 4, which is screwed coaxially to the drive shaft 1 on the gear-side end wall 5 (FIG. 1). The center of the driving disk 3 is the center of the eccentric cam la, which is why the axis of the driving disk 3 rotates about the housing axis and the driving disk 3 rotates in the direction of rotation of the drive shaft 1 (FIG. 3). In the driving plate 3, three driving pins 8, 11, 14 are rotatably mounted parallel to the housing axis. These are evenly distributed on the drive plate 3, so that they form the same radii with the center of the same and enclose the same angle (120 degrees). The driving pins 8, 11, 14 have projecting heads, each of which is provided with two parallel sliding surfaces. These heads each engage in a slot of a rotary piston lever 7, 10, 13, which levers are each secured to one of the hollow shafts 6, 9, 12 lying coaxially to the working shaft 1 by means of spline hubs (FIGS. 1 and 4). Each of these three hollow shafts 6, 9, 12 is non-rotatably connected at the opposite end to one of the three rotary pistons 15, 16, 17. These three rotary pistons 15, 16, 17 have hubs with the same outside diameter (FIGS. 6, 8, 9). In the case of the rotary piston 17, the hub is formed by the hollow shaft 12, which projects into the rotary piston 17 by a third of the piston width. The rotary piston 16 is formed with a spline hub 22 which lies in the center of the piston and occupies the second third of the piston width. The rotary piston 15 has a spline hub 23, the projecting part of which is mounted in the outer end wall 21 (FIG. 1), while the remaining part projects up to one third of the piston width into the rotary piston 15. The hollow shafts 6, 9 are with the. Wedge hubs 23, 22 connected in a rotationally fixed manner.

To enable effective sealing, everyone is the

OP Provide piston 15, 16, 17 against its hub 23, '22, 12 with a recess 24 and radially above the hub with a tongue 25 (FIGS. 10, 11). The recess 24 is designed to receive a radially inwardly directed seal, while the tongue 25 and the outer jacket of the rotary pistons are provided for receiving an outwardly acting seal. The inward seal (Figures 11, 12 and 13) has two interdigitated angles 26. The side flanges 27 of the same are held in the radial direction in a form-fitting manner in lateral recesses 29 (FIGS. 9, 10) of the rotary pistons and are pressed against the housing walls 19 and 21 by curved leaf springs 30. The radially inner flanges 28 are comb-shaped and adapted to the curvature of the tongue 25, so that there is a small play between the flanges 28 and the tongue 25, which is sealed by the seal provided on the tongue 25 and acting radially outwards .

To accommodate the seal (FIGS. 14, 15 and 16) attached to the outer jacket of the rotary piston, a groove 31 is provided on the rotary line of the rotary piston and a recess 32 is provided on both sides of the rotary piston (FIGS. 9 and 10). A two-part sealing rod 33, 34 is slidably guided in the groove 31 (FIG. 16). Half of the two rod parts are offset, so that they have a common displacement surface lying in the radial direction and the cross sections of the offset parts together correspond to the cross section of the outer rod ends. The rod parts 33, 34 have a bore 35 in their longitudinal direction, in which a helical compression spring 36 is accommodated, which is prevented from falling out by a pin 37. The helical spring 36 presses the two rod ends against the housing walls 19 and 21, respectively. In addition, the two-part sealing rod 33, 34 is pressed against the housing jacket 18 by a curved leaf spring 38.

In the side recesses 32 (Figures 9 and 10)

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OMPI One seal 39, which corresponds to the shape of a circular displacement surface, is pushed in and is pressed against the housing walls 19 or 21 by a curved leaf spring 40 of the same shape. Both seals 39 are provided with a groove 41 for receiving the two-part sealing rod 33, 34 (FIG. 15). The seal attached to the outer jacket of the rotary piston corresponds in principle to the seal provided on tongue 25 (FIG. 11). These two seals are connected to one another by two rod seals 43 located on the side of the rotary piston and guided in grooves 42, the rod seals 43 projecting into recesses 44 in the seals 39 (FIG. 15). In a corresponding manner, the seal attached to the outer jacket of the rotary piston is connected by two rod seals 46 located laterally on the rotary piston and guided in grooves 45 (FIGS. 9, 10 and 11). The rod seals 43, 46 are pressed against the housing walls 19 and 21 by leaf springs 47 bent in a zigzag manner (FIGS. 17 and 18).

The mode of operation of the rotary piston movements is shown schematically in FIGS. 19-22. In Figure 19, the eccentric axis E is at the top. The internal toothing 3a of the driving disk 3 therefore engages below in the toothing 4a of the fixed pinion 4. While the driving pins 8, 11, 14 are at the same distance from the eccentric axis and lie at the same angle about the axis E, the rotary pistons are bel 7, 10, 13 directed radially to the housing axis A. The driving pins 8, 11, 14 in FIGS. 19-22 are, however, shown rotated by 60 degrees compared to FIGS. 1-4. The driving disk 3 in FIG. 19 presses the rotary piston levers 7, 13 upward with its bolts 8, 14, so that the rotary pistons 15 and 17 are moved relatively against one another at the top, the working space lying between these two rotary pistons being compressed to a minimum becomes. According to FIG. 19, this is at the beginning of the suction. The following working space between the rotary pistons 15 and 16 is compressed, while the third working space between the rotary pistons 16 and 17 expands. According to FIG. 20, the drive shaft 1 with the eccentric E has rotated 90 degrees with respect to FIG. 19. The working space between the pistons 15 and 17 has increased and that between the pistons 15 and 16 has decreased, while the working space between the pistons 16 and 17 has reached its maximum volume.

The number of teeth between the fixed pinion toothing 4a relates to the number of teeth of the toothing 3a of the driving disk 3 as two to three. With a 90 degree rotation of the shaft 1 with the eccentric E, the driving disk 3 rolls 2 / 3x90 = 60 degrees on the fixed pinion 4, so that the driving disk 3 with the rotary pistons and the working spaces move by approx. 90-60 = 30 degrees turns forward. When shaft 1 is rotated by 180 degrees, the working spaces therefore rotate by 180-120 = 60 degrees in accordance with FIG. 21. The working space between pistons 15 and 16 has assumed its smallest volume, while the working space between pistons 16 and 17 reduced again. According to FIG. 22, the working space between the pistons 17 and 15 has taken up its largest volume.

With a complete revolution of the drive shaft 1 there is again a piston position according to FIG. 19, but with the difference that the working space between the pistons 16 and 17 takes up a minimum volume. Each of the three work rooms then turned through 120 degrees. With three full revolutions of the drive shaft 1, each of the working spaces rotates through 360 degrees.

In the design of the three-piston engine as a four-stroke internal combustion engine according to FIGS. 19a to 22a, each of the three working spaces suffers every four cycles with three full revolutions of the drive shaft 1: intake - compression - expansion - ejection. The ignition takes place after the compression (FIG. 21a).

The rotational effect of the pistons 15, 16, 17 on the drive shaft le 1 during the expansion can be seen from the force plan in FIG. 22. The force F1 of the rotary piston 16, together with the force F2 of the rotary piston 15, results in the resultant R on the eccentric E, a torque being generated in the clockwise direction.

So that the intake port 47 does not have to be placed too close to the outlet port 48 (FIG. 19a), indentations 49 are provided on the rotary pistons 15, 16, 17 (FIG. 7).

If the four-stroke rotary engine is designed as a suction or pressure pump, as a compressor or as a steam engine, there are two inlet ports and two outlet ports.

The rotary lobe machine described can be designed with two, three, four or six rotary lobes.

OMPI

Claims

Claims:

1. Rotary piston machine with a cylinder-like housing and a drive shaft lying in the cylinder axis, characterized in that the housing (5, 18-21) encloses a rotation cavity in which at least two sector-type rotary pistons (15, 16, 17) with angular velocities that change periodically with respect to one another, so that working spaces are formed between the rotary pistons, the volumes of which change periodically so that the drive shaft (1) carries an eccentric cam (la) on which a rotating, with the internal toothing (3a) bearing plate (3) is mounted, which engages with its internal toothing (3a) in a housing (5, 18-21) fixed to the drive shaft (1) coaxial spur gear (4) that the driving plate (3) carries driving bolts (8, 11, 14), which are operatively connected to a rotary piston lever (7, 10, 13) and each rotary piston lever (7, 10, 13) via a coaxial shaft to the drive shaft (1) lying End hollow shaft (6, 9, 12) with one of the rotary pistons (15, 16, 17) is rotatably connected, and that the rotary pistons (15, 16, 17) ^■ are provided with seals in both radial directions and in both axial directions.

2. Rotary piston machine according to claim 1, characterized in that it is a four-stroke engine with a tooth ratio of two to three of the external toothing (4a) of the fixed pinion (4) for the internal toothing (3a) of the driving disk rolling on the pinion (4). 3) is formed.

3. Rotary piston machine according to claim 2, character- ized in that the driving bolts (8, 11, 14) on the driving disk (3) with the center thereof at the same radii enclose the same central angle of 120 degrees.

-BUREAlT

OMPI

4. Rotary piston machine according to claim 3, characterized ge indicates that the driving pins (8, 11, 14) in the driving plate (3) are rotatably mounted and with their heads in a longitudinal slot of the rotary piston lever (7, 10, 13) sliding stuck.

5. Rotary piston machine according to claim 4, characterized ge indicates that the rotary piston levers (7, 10, 13) via the hollow shafts (6, 9, 12) by splined splines with the rotary pistons (15, 16, 17) connected in a rotationally fixed manner are.

6. Rotary piston machine according to claim 1, characterized ge indicates that each of the rotary pistons (15, 16, 17) over its hub (23, 22, 12) has a recess (24) for receiving a tongue (25) of the adjacent rotary piston and on the opposite side has the tongue (25).

7. Rotary piston machine according to claim 6, characterized in that on the recess (24) a radially inward seal, on the tongue (25) and on the outer jacket of each rotary piston (15, 16, 17) one each to the outside Acting seal is provided, and that the seal attached to the outer jacket is connected by laterally acting seals to the seal on the recess (24) and on the tongue (25).

8. Rotary piston machine according to claim 7, characterized ge indicates that the inwardly directed seal at the recess (24) has two sealing angles (26) with flanges (28) lying radially inward, intermeshing and with on both sides on Rotary pistons (15, 16, 17) in recesses

(29) radially held by curved leaf springs

(30) are laterally pressed out flanges (27).

A. W1PO

9. Rotary piston machine according to claim 7, characterized ge indicates that the radially outwardly acting seals on the outer jacket of the rotary piston (15, 16, 17) and on the tongue (25) thereof are each provided with a two-part sealing rod (33, 34) , the two parts of which are offset on the mutually facing longitudinal sides in such a way that they have a common displacement surface, and that the two rod parts (33, 34) are bent under the laterally outwardly acting pressure of a helical spring (36) Leaf spring (38) stand.

10. Rotary piston machine according to claim -7, characterized ge indicates that on both sides of the rotary piston (15, 16, 17) in the sealing rods (33, 34) each, by a curved leaf spring (40) outwardly pressed seal (39 ) is provided which has a groove (41) for receiving the rod parts (33, 34) and recesses (44) for receiving lateral rod seals (43, 46) under the pressure of a zigzag leaf spring (47). having.

11. Rotary piston machine according to claim 2, characterized ge indicates that it is designed as an internal combustion engine, as a suction or pressure pump, as a compressor or as a steam engine.

12. Rotary piston machine according to claim 2, characterized ge indicates that it has two, three, four or six rotary pistons. CHANGED CLAIMS (received at the International Bureau on February 7, 1979 (February 7, 1979))

1. Rotary piston machine, with a cylinder-like housing and a drive shaft lying in the cylinder axis, the housing enclosing a rotation cavity in which at least two sector-type rotary pistons are arranged one after the other with angular velocities that change periodically with respect to one another, so that between the rotary piston form working spaces, the volume of which changes periodically, the drive shaft carrying an eccentric cam on which is mounted a rotating drive disk provided with internal toothing, which with its internal toothing is connected to a spur gear which is firmly connected to the housing and coaxial with the drive shaft engages, the driver disk carrying driver bolts, which are each operatively connected to a rotary piston lever and each rotary piston lever is connected non-rotatably to one of the rotary pistons via a hollow shaft lying coaxially with the drive shaft, and wherein the rotary pistons are provided with seals, thereby identifying them Chnet that the seals acting radially outwards on the outer casing of the rotary piston (15, 16, 17) and on the tongue (25) thereof are each provided with a two-part sealing rod (33, 34), the two of which Parts are offset on the mutually facing longitudinal sides in such a way that they have a common displacement surface, and that the two rod parts (33, 34) are subjected to an axially acting pressure of a helical spring (36) and a radially acting curved leaf spring ( 38) stand. 2. Rotary piston machine according to claim 1, characterized in that the rotary piston levers (7, 10, 13) via the hollow shafts (6, 9, 12) by spline connections with the rotary pistons (15, 16, 17) are rotatably connected.

OP

INARTICLE 19 CERTIFICATE

In response to the International Search Report dated December 8, 1978, I am sending you revised Claims 1 and 2, which are delimited from the references and clarify the invention, with the request that these be used as a basis for further examination.

Due to lack of novelty, the old claims 2, 3, 4, 6, 7, 8, 10, 11 and 12 have been omitted.

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