WO2012159750A2

WO2012159750A2 - Rotary piston engine having side plates

Info

Publication number: WO2012159750A2
Application number: PCT/EP2012/002202
Authority: WO
Inventors: Karl Knaus; Michael Steinbauer; Robert Berger
Original assignee: Avl List Gmbh
Priority date: 2011-05-23
Filing date: 2012-05-23
Publication date: 2012-11-29
Also published as: AT511486A1; DE112012002235A5; WO2012159750A3; AT511486B1

Abstract

The invention relates to a rotary piston engine, comprising a housing that has a substantially trochoidal cut-out. At least one rotary piston is arranged rotatably on an eccentric shaft in said cut-out. Viewed in the axial direction of the eccentric shaft, the housing is delimited by at least one side plate. Said side plate has a central bore that accommodates the eccentric shaft. At least one sealing device is provided on at least one end face. Said sealing device slides on the inner surface of said side plate during operation. A plurality of side plate grooves are provided on the inner surface of the side plate. Said side plate grooves run substantially helically from an outer region of the side plate toward the central bore. Piston points are located opposite the side plate grooves on the rotary piston. The projection of the speed vector of the piston point on the tangent of the course of the side plate groove in said piston point has a radially inward directed component. A radially inward directed fluid flow is achieved by a movement of the piston in cooperation with the side plate grooves in a lubricant present between the rotary piston and the side plate, and thus the sealing action of the sealing device is improved.

Description

ROTARY PISTON ENGINE WITH SIDE PANELS

The present invention relates to a rotary piston machine and more particularly to a rotary engine.

In the following the invention will be described with reference to a rotary engine in which a substantially triangular rotary piston rotates on an eccentric shaft arranged in a motor housing. The invention is also applicable to a rotary piston with two, four or more piston corners. Furthermore, the invention may also be applied to rotary piston engines having two, three or more

juxtaposed pistons are used.

In machines and systems, it is customary, in particular to reduce friction and to reduce wear, to supply components moving against one another, at least in the region of their contact points, with lubricant. It is generally desirable to hold the lubricant in certain predefined areas with the aid of sealing devices.

or keep away from other areas.

From the prior art are rotary piston machines, in particular

Rotary piston engines known in which a combustion chamber by a

Housing, in particular a trochoidal portion of the housing, two side plates and a housing movably mounted rotary piston is formed. The movable rotary piston is sealed in particular with respect to the side plates by means of sealing devices, in particular so-called curved strips. During operation of these rotary piston machines, it may happen that

Lubricant passes past these sealing devices into the combustion chamber. During the combustion of the fuel / air mixture, the lubricant leads to undesirable effects.

The invention is based on the object, the design of a

Rotary piston machine in the field of these sealing devices to improve.

This object is achieved by the teaching of independent claim 1. Preferred developments of the invention are the subject of the dependent claims. A rotary engine has a housing with a substantially

trochoidenförmige recess on. In this recess at least one rotary piston is rotatably mounted on an eccentric shaft. The housing is, as viewed in the axial direction of the eccentric shaft, limited by at least one side plate. This side plate has a central bore, these being the

Eccentric shaft receives. At least one sealing device is provided on at least one end face of the rotary piston. This sealing device slides during operation on the inner surface of this side plate. On the inner surface of the side plate is preferably provided a plurality, but at least one, side plate grooves. These side plate grooves extend substantially helically from an outer portion of the side plate toward the central bore. The side plate grooves are opposed to piston points on the rotary piston. In this case, the side plate groove is oriented such that the projection of the

Velocity vector of such a piston point on the tangent of the

History of the side plate groove, having a radially inwardly directed component. In this case, a radially inwardly directed Fludidstrom is achieved by the movement of the piston in cooperation with the side plate grooves in a, located between the rotary piston and the side plate lubricant, and thus improves the sealing effect of the sealing device.

A rotary piston engine in the sense of the invention is understood to mean a device which, in particular, serves to convert chemical energy of a fuel into mechanical energy within a combustion chamber. For this purpose, a chemical reaction of fuel and in particular oxygen of the ambient air takes place in the combustion chamber of the internal combustion engine. Preferably, the drives

Internal combustion engine to a generator, which serves in particular the conversion of mechanical energy into electrical energy.

Under a rotary piston according to the invention, a rotary piston is to be understood, which rotates during operation of the rotary piston engine in the housing about an eccentrically mounted shaft (eccentric shaft) and thereby

in particular performs a planet-like movement. The housing accommodates the rotary piston or pistons in a substantially trochoid-shaped recess and is preferably formed by two lateral one-piece or multi-part

Housing cover, also referred to as side plates, covered. Preferably, the rotary piston and / or the housing and / or the

Housing cover a material from the following group, which alloys with iron, alloys with aluminum, alloys with magnesium, steel,

Having oxide ceramics with aluminum, non-oxide ceramics with carbides or nitrides of aluminum or silicon.

In the context of the invention, a side plate groove is to be understood as meaning a recess opposite at least one area of the inner surface of the side plate. there

Is lowered production method, or that the inner surface of the

Side plate relative to the groove bottom of the side plate groove, in particular by a coating method is raised. Further preferably, the runs

Side plate groove from radially outside to radially inside on the side plate.

Under a piston point in the context of the invention is a place on the

To understand rotary piston, which is the side plate groove opposite.

In this case, the position of the piston point changes on the rotary piston when it moves relative to the side plate and thus with respect to the side plate groove.

Hereinafter, preferred developments of the invention will be described.

In a preferred embodiment, the side panel notch is fabricated using a pawn-to-die method of manufacture. Preferably, these production methods are a production method with a specific cutting edge but preferably a production method with an undefined cutting edge.

Greasing Method D-J & I & making a side plate groove are honing, grinding, milling and engraving in particular.

In a further preferred embodiment, the side plate groove is produced by a manufacturing process which involves a blast treatment. Such a manufacturing method may preferably have a particle beam, such a particle beam is preferably a sand jet or a beam which metal or ceramic particles. As a carrier medium for these particles is used preferably a fluid stream. In such a manufacturing method, a compaction or removal of near-surface material layers of the side plates is achieved by the kinetic energy of the particles and thereby generates a side plate groove. Such a manufacturing method with blast treatment may preferably also have an electron or laser beam. By a laser or electron beam method, in particular a particularly precise and / or narrow side plate groove can be produced.

In a further preferred embodiment, the side plate groove is produced by a material application method. Preferably is under one

Material application method, the application of a further layer of material,

especially on the inner surface of the side plate, to understand. Further

Preferably, these production methods are to be understood as meaning those which have, in particular, process or method steps such as physical vapor deposition, chrome plating, nickel plating, build-up welding or the like. By such a material application method can be achieved that the inner surface other material properties, in particular a better sliding or

Has heat resistance.

In a further preferred embodiment, the side plate groove by a forming manufacturing process, in particular a cold-forming

Manufacturing process, generated. Further preferably, among such

Manufacturing process embossing, forging, pressing or the like to understand. In particular, by such a manufacturing method, a side plates with side plate groove can be produced with high efficiency.

In a preferred embodiment, the side plate groove has a groove depth NT, which is preferably greater than 0.1 μm, preferably greater than 1 μm and particularly preferably greater than 5 μm and / or more preferably less than 100 μm, preferably less than 50 μm and more preferably less than 10 pm. By a side plate groove in the described embodiment can be achieved in particular that at low production costs sufficient

Promotional effects for the lubricant can be achieved. In a preferred embodiment, the side plate groove has a groove width NB, which is preferably greater than 1 μητι, preferably greater than 10 pm and more preferably greater than 100 m and / or more preferably less than 1000 pm, preferably less than 300 pm and more preferably less than 150 pm. By means of a side plate groove in the described embodiment, it can be achieved, in particular, that a sufficient conveying effect for the lubricant can be achieved with a low manufacturing outlay.

In a preferred embodiment, the side plate groove does not extend in the radial direction over the entire inner surface of the side plate. Further preferably, the side plate groove may be bounded radially outwardly by an inner envelope. This inner envelope results from the movement of the rotary piston and the position of an outer sealing device on the rotary piston. Further preferably, a boundary of the side plate groove is provided only in certain areas of the side plate. Preferably, such areas are characterized by positions of the rotary piston in which these from the working space a high gas pressure loads, such positions of the piston are in particular those in which a fuel / air mixture is expanded in the combustion chamber or immediately before it is expanded and so that it is almost completely compressed. A high gas pressure rests on the rotary piston, in particular when the pressure in the combustion chamber is 10 bar or higher. The inner envelope is to be understood in particular as the projection of the points of the outer sealing device on the inner surface of the side plate, these points being characterized in that they have the smallest approximation to the central bore during one complete revolution of the rotary piston in the housing. By this configuration of the side plate groove can be avoided that the outer sealing device sweeps over the side plate groove, and thus a

Drainage effect under the sealing device is formed by

Lubricant can penetrate into the combustion chamber.

In a preferred embodiment, the side plate groove does not extend in the radial direction over the entire inner surface of the side plate. Further preferably, the side plate groove is bounded in the radial direction inwardly by an outer envelope. This outer envelope results from the movement of the rotary piston and the position of an inner sealing device and the position of a Sealing bolt or a Dichtbolzenausnehmung on the rotary piston. As the outer envelope, in particular, the projection of the points of the aforementioned devices with the closest approach to the central bore during a complete revolution of the rotary piston in the housing to understand the inner surface of the side plate. This configuration of the side plate groove can be avoided that the inner sealing device or the

Dichtbolzenausnehmung the side plate groove sweeps, and thus a

Drainage effect arises under this device through.

In a preferred embodiment, two adjacent side plate grooves are at least partially spaced by a distance AN. Further

Preferably, this distance AN between two adjacent side plate grooves is not undershot. Preferably, this distance AN is greater than the groove width NB preferably greater than 25 times NB and particularly preferably greater than 100 times NB and / or more preferably less than 10,000 NB, less than 2000 NB and most preferably less than 500 NB. In this case, the distance NB is preferably such that a sufficient number of

Side plate grooves is provided on the side plate in order to ensure a sufficient conveying effect in the lubricant and thus, in particular in the case of the outer sealing means to achieve an improved seal.

Further advantages, features and applications of the present invention will become apparent from the following description taken in conjunction with the figures.

It shows:

1: the inner surface of a side plate with spiral Seitenplatten- grooves which extend in the radial direction over the entire inner surface,

2: the rotary piston within the trochoidenförmigen recess of

housing,

Fig. 3: the groove width and groove depth of a side plates 4: the inner surface of a side plate with spiral side plate grooves, which do not run over the entire inner surface but are limited by an inner envelope,

Figure 1 shows a side plate 1 with side plate grooves 2, which are arranged on the inner surface 11 of the side plate. In the side plate grooves 2 lubricant 12 flows in the radial direction inwardly to the central bore 5. The eccentric shaft (not shown) rotates in the direction of arrow 6. Der

Piston point 10 moves in the illustrated moment in the direction of the speed sector 13. The piston point 10 selected here lies between the projection of the inner sealing device 3, the projection of the outer

Sealing device 4 and in the region of the side plate groove 2. In particular by the movement of the rotary piston (not shown) is a flow of

Lubricant 12 caused in the side plate grooves 2. The side plate grooves 2 are spaced at least by the distance AN. By means of a large distance AN 9, a good sealing effect of the sealing devices (not shown) is achieved. The flow of the lubricant 12 in the radial direction inwards is in particular caused by the fact that the projection 15 of the

Velocity vector 13 on the tangent 14 of the profile of the side plate groove 2 has a radially inwardly directed component.

FIG. 2 shows a circular piston 18 in the trochoidal recess 16 of the housing 17. This rotary piston 18 has outer sealing devices 22, an inner sealing device 23 and a plurality of sealing bolts 19 each having a sealing bolt recess 20. The rotary piston 18 leads in this

Trochoidenförmigen recess 16, among other things guided by the

Eccentric shaft 21, a planet-like movement. Envelopes for the sealing devices 19, 20, 22 and 23 result from this particular type of movement. This envelope defines a particularly preferred range for the devices

Arrangement of the side plate grooves (not shown) on the side plate 1.

FIG. 3 shows a section through a side plate 1. In the area of the inner surface 11 of the side plate, the side plate grooves 2 are arranged. The side plate grooves have a groove depth NT. The width of the side plate Grooves 2 is indicated by the groove width NB. Two side plate grooves 2 are spaced by the slot spacing AN.

FIG. 4 shows a side plate 1 with a central bore 5. On the inner surface 11 a plurality of side plate grooves 2 are arranged. These

Side plate grooves 2 extend, starting at the outer edge of the

Side plate 1, not over the entire area of the inner surface 11 of

Side Plate 1. The side plate grooves 2 in this embodiment are bounded radially inward by an outer envelope 24 of the inner sealing device (not shown). In this embodiment, in particular, the sealing effect of the inner sealing device (not shown) is improved.

Claims

claims

Rotary piston engine with a housing (17), which has a substantially trochoidenförmige recess (16), in which at least

a rotary piston (18)

an eccentric shaft is rotatably arranged,

wherein the housing (17), seen in the axial direction of the eccentric shaft, by at least

a side plate (1) is completed, which

a central bore (5) which receives this eccentric shaft, and

wherein at least

an end face of the rotary piston at least

a sealing device (22, 23) is provided, which slides during operation on the inner surface of this side plate (1)

characterized,

in that a plurality of side plate grooves (2) are provided on this inner surface of this side plate (1), which run substantially helically from the outer region of the side plate (1) substantially towards the central bore (5),

that the rotary piston (18) at least in one of the side plate groove (2) opposite piston point (10) moves so that

the projection (15) of the velocity vector (13) of the piston point (10) on the tangent of the profile of the side plate groove (2) in this piston point (10)

having a radially inwardly directed component.

Rotary piston engine according to claim 1, characterized in that the side plate groove (2) is produced by a machining process with a certain or indefinite cutting edge, in particular by honing, grinding, milling, engraving or the like.

3. Rotary piston engine according to claim 1, characterized in that the side plate groove (2) is produced by a manufacturing process, which includes a jet treatment, in particular with a laser, electron or particle beam.

Rotary piston engine according to claim 1, characterized in that the side plate groove (2) is produced by a material application process, which in particular process or process steps such as Physical Vapor Deposition, chrome plating, nickel plating or the like.

Rotary piston engine according to claim 1, characterized in that the side plate groove (2) is produced with a forming, in particular cold-forming manufacturing process, preferably by embossing, forging, pressing or the like.

Rotary piston engine according to one of the preceding claims, characterized in that

the side plate groove (2) has a depth which is at least greater than 0.1 μm, preferably greater than 1 μm and particularly preferably greater than 5 μm and / or more preferably less than 100 μm, preferably less than 50 μm and especially preferably less than 10 μηι.

the side plate groove (2) has a groove width NB which is at least greater than 1 μηι, preferably greater than 10 μηα and particularly preferably greater than 100 μηη and / or more preferably less than 1000 μιη, preferably less than 300 μιη and particularly preferably less than 150 μηη.

8. Rotary piston engine according to one of the preceding claims, characterized in that

the side plate groove (2) extends in the radial direction preferably only in a specific region of the side plate (1),

wherein the side plate groove (2) in the radial outward direction preferably by an inner envelope (24), which results from the movement of the rotary piston (18) and the position of an outer sealing means (22) of the rotary piston (18),

is limited.

the side plate groove (2) in the radial direction preferably only in a certain area of the side plate (1),

wherein the side plate groove (2) in the radially outward direction preferably by an inner envelope (24), which consists of the movement of the rotary piston (18) and the position of a sealing bolt (19) or in the sealing bolt (19) arranged sealing bolt - recess (20),

is limited. Rotary piston engine according to one of the preceding claims, characterized in that

the side plate groove (2) in the radial direction preferably extends only in a certain area of the side plate (1),

the side plate groove (2) being radially inwardly, preferably through the outer envelope (24) resulting from the movement of the rotary piston (18) and the location of an inner sealing means (23) of the rotary piston (18),

is limited.

two adjacent side plate grooves (2) are at least partially spaced by a distance AN,

wherein this distance AN is at least greater than the groove width NB, preferably greater than 25 times NB and particularly preferably greater than 100 times NB and / or more preferably less than 10,000 NB, preferably less than 2000 NB, and more preferably less than 500 times NB.