DE102005000034A1 - Rotary slide valve for opening and/or closing of liquid and/or gas conducting connection to combustion chamber, has sealing unit arranged with sealing lip such that lip in closed valve position is brought into position resting against body - Google Patents

Abstract

The valve has a sealing unit arranged proximate to a rotary body. The sealing unit is arranged with a flexible sealing lip (6) in such a manner that the lip in a closed position of the valve is brought into a position resting against the body by pressurization of a combustion chamber. The sealing unit is provided with an under cut (8), where section of the under cut regions lying near the chamber forms the lip. An independent claim is also included for a method for intake and/or exhaust of gases in an internal combustion engine.

Description

The The invention relates to a rotary valve for a motor vehicle, in particular a rotary valve for the inlet and outlet of a Internal combustion engine, equipped with a rotary valve Internal combustion engine and an associated method for the inlet or outlet of gases in an internal combustion engine.

in the Prior art are various types of rotary valve valve assemblies for internal combustion engines known.

valves internal combustion engines are used regardless of the thermodynamic process used the inlet for the air-fuel mixture and the outlet for the combustion gases synchronous with the orbital movement of the piston located in the combustion chamber to control. To date, these have been essentially conventional poppet valves used. However, these have numerous disadvantages. poppet valves with central plunger influence due to their geometry adversely the flow. Your control requires a comparatively large additional height of the internal combustion engine and leads due to the stop-limited movement of the valves and thus accompanying shock noises a comparatively high noise level. In case of disturbances the movement of the valve occur in most cases comparatively size damage on the combustion engine. To avoid these and other disadvantages, Rotary slide valves were developed in many different designs.

moreover have been making great efforts in the past made the internal combustion engines more environmentally friendly and at the same time more fuel-efficient to design. More and more functions are controlled electronically. The only remaining essential elements, the gas exchange valves, can so far only to a very small extent electronically influenced become. So phasing for the camshaft and reversible Cam profiles developed. After all, these allow a certain amount Influencing the gas exchange process depending on the respective operating state. Desirable however, is a fully variable valve control, where not only a shift in the timing - as in the camshaft adjustment - or a Switching between two possible Control time variants but rather a completely independent control the opening and closing times possible is. As a result, a throttle valve can be omitted, throttle losses by the pressure drop at the throttle valve, in particular in the partial load range the internal combustion engine can be avoided. A system with the possibility to electronic control of the valves was at FEV engine technology developed, wherein the movement of each conventional poppet valve by each a magnetic actuator is controlled. An equipped one Internal combustion engine is however comparatively expensive and can additionally, avoid the disadvantages associated with poppet valves. Et al are high demands on the exact control of the valve speed If the speed is too high, it may be too high noise or damage come. In addition, due to dynamic effects, the movement speed limited to the valves, so that these Control does not use in high-speed internal combustion engines is.

For now However, the seal of the rotary valves is not full Satisfaction solved. By the high pressures and temperatures when using the rotary valves in the and / or outlet channel an internal combustion engine are particularly demanding the seal provided for a sealing of the combustion chamber in the region of the usually provided rotational body of the Rotary slide valve ensures.

The US 6,578,538 B2 describes an internal combustion engine with at least one rotary valve in the inlet channel, which is constructed in the form of two sleeves. A mechanical adjustment of the sleeves to each other allows the adjustment of the opening duration of the rotary valve. The sealing of the combustion chamber in the region of the rotary slide valve takes place by means of a comparatively complicated seal consisting of several sealing rings, which is arranged on the rotary slide valve itself.

The US 5,626,107 discloses a rotary valve actuated by an electromagnetic actuator. The movement of the rotary valve is limited to an angular range. The sealing of the combustion chamber in the region of the valve is effected by a cylindrical boreholes up and down, but effected by means of a biased with a spring sealing element. This form of seal is particularly prone to failure and is not suitable due to its design for rotating rotary valves.

The US 5,329,897 shows an inter alia electromechanically actuated rotary valve in an internal combustion engine, wherein the charge exchange channel of the lateral surface of the rotating body to its surface, which is perpendicular to the axis of rotation leads. Furthermore, the use of several rotary valves as well as the use of a rotary valve for the inlet and outlet tract ge shows. The sealing of the combustion chamber in the region of the rotary slide valves is effected by a rotary valve in the lateral surface integrated, flexible, provided with a hole sealing element. With a corresponding pressure in the combustion chamber, this continues through the hole between the sealing element and the rotary valve and causes beyond the rest position outward curvature of the sealing element, resulting in a seal. This construction is particularly complex and prone to failure.

The US 5,579,730 discloses a cylindrical rotary valve with two circumferential, optionally Teflon (r) coated sealing strips. This system is particularly susceptible to wear in comparison.

The US 5,878,707 relates to a cylindrical, movable element between the rotary valve and the combustion chamber, which prevents the unwanted escape of the air-fuel mixture or the combustion gases from the combustion chamber by being pressed against the rotary valve.

In the US 6,308,677 B1 An internal combustion engine with a rotary valve is described, in which the sealing against gases emerging from the combustion chamber is achieved by means of sealing rings between the running surface of the rotary valve and the cylinder head. This system is particularly susceptible to wear. Furthermore, the hot gases penetrate comparatively very far and cause disadvantageous to a heating of the rotary valve.

Further, the US 6,755,171 B1 an internal combustion engine, each having a rotary valve in the inlet and Auslaßtrakt, wherein at least one of the valves has a special form of the passage channel with turbine-like inlet. The sealing takes place on the lateral surface of the rotary slide valve by a plurality of sealing rings. Again, this system is particularly susceptible to wear. Furthermore, the hot gases in turn penetrate comparatively very far and cause disadvantageous to a heating of the rotary valve.

The US 5,205,251 discloses an internal combustion engine with rotary valve. The valve has a structure of two sleeves, which are rotatably supported against each other, whereby by varying the angular velocity of the sleeves to each other, the opening and closing cycles of the valve are affected. The valves are driven by the crankshaft.

The US 2003/0116108 A1 as well as those originating from the same inventor WO 02/097244 A1 likewise discloses an electromotive or crankshaft operated rotary valve in an internal combustion engine, into which an intake or outlet channel is integrated.

Task of invention

It is therefore an object of the present invention, a rotary valve and a method for sealing a rotary valve create, by the sealing comparatively effective, low-wear, uncomplicated and thus realized economically from an economic point of view becomes.

These The object is achieved by a Rotary slide valve with the features of claim 1 and by a Method solved with the features of claim 10.

The inventive rotary valve is to open or closing a liquid or used gas-conducting connection to a room on a motor vehicle. For example, it can be used as a closure of a liquefied petroleum gas container become. The rotary valve has at least one flow channel in a rotatably mounted rotary body of the rotary valve on. The rotation body can be formed substantially cylindrical or cylindrical, conical or frustoconical be.

Of the body of revolution may be provided with one or more flow channels. For example are the openings the flow channel in the lateral surface of the rotational body arranged.

Of the Flow channel extends in an alternative embodiment from an end face of the Rotating body, d. H. from the rotational axis direction end of the rotary body to Lateral surface. This has the advantage that through the rotation of the body of revolution not unnecessarily two openings changed in cross section and thus the flow behavior is negatively affected.

Adjacent to the rotational body, a sealing element is arranged. The rotary valve is according to the invention designed such that by a rotational movement of the rotary body, the rotary valve is to be moved to an open position to make the connection with the room by means of the flow channel. This allows gases or liquids to be introduced into or out of the room or led out. The rotary body can be rotated, for example, by an electric motor, ball bearings being provided for supporting the rotary body, for example. By a further rotational movement of the rotary body, the rotary valve is to move to a closed position to the connection of the Durchströ closing channel. For example, if one or more flow channels for the inlet and outlet provided, the closed or open state refers to each responsible for the inlet and outlet flow channels, ie the rotation body is brought by rotation in a position that the one or more passageways are closed for the inlet, then in one embodiment, the passageways provided for the outlet are opened and vice versa.

According to the invention the aforesaid sealing element has a flexible sealing lip designed in such a way is that the Sealing lip at least in the closed position of the rotary valve by Pressurization of the space in a voltage applied to the rotating body Position is. For example, the pressurization of the Room through the filling of the room over that Rotary slide valve reached. By this configuration of the sealing element is a particularly simple and effective sealing of the rotary valve or the above to be filled or emptying room reached. Troublesome spring constructions may be due to the flexible design and pressure-controlled movement of the sealing lip advantageous omitted.

Thereby, that the Pressurizing the space a concern of the sealing lip to the body of revolution causes the sealing lip at reduced pressure compared also pressed with reduced pressure to the rotary body. Of the Wear on the sealing lip and thus on the sealing element thus falls particularly low from, if doing a rotary motion, in particular high-frequency rotation of the rotational body is made. Further, the friction to overcome the rotation of the body of revolution is advantageously reduced.

at A further advantageous embodiment is the sealing element the rotary valve of the invention with one away from the rotational body running undercut provided. The section closer to the room the undercut portion of the sealing element forms the sealing lip. As a result, the flexible sealing lip can be produced in a particularly simple and cost-effective manner become.

Of the on the side of the rotary valve, lying away from the room Section of the undercut portion of the sealing element is at an embodiment designed such that it the deflection of as Sealing lip acting section limited, or the bent Sealing lip supports, being a possible damage or blocking the rotary valve due to the so achieved Limiting the deflection is prevented to a maximum extent.

According to one Another advantageous embodiment is the sealing element with a Recess for the flow channel provided, wherein the sealing lip in the recess circumferentially, in the region of lateral surface of the rotational body is arranged. For example, the sealing lip is annular and encloses in open Position the opening the flow channel in the lateral surface of the rotational body. This is advantageous with the immediate contact area of the rotating body to be closed Space on a minimum area reduced. This is for example advantageous to large temperature differences between space and rotation body to avoid adverse effects on the inlet or outlet.

is for example the space a combustion chamber of an internal combustion engine, Thus, by this design of the sealing lip advantageously the surface of the Reduced contact area between combustion gases and rotating body be to a relatively high heating of the rotating body cause. A thereby caused adverse effect on the combustion process, such as Example increased NOx emission is reduced or even avoided.

at A further advantageous embodiment is the sealing element designed such that the sealing lip is not in contact with the rotational body during a rotational movement of the rotational body, or is spaced therefrom. This reduces the friction and the wear especially advantageous.

Of the body of revolution is in a further advantageous embodiment of the in the rotation axis direction pointing end areas or in the region of its end faces at least flattened in a contact region of the sealing lip or curved or rounded. Preferably, it is provided that the sealing lip on the Area of rounding leads, So that the circumferential line of the sealing surface has no unsteady corners. This ensures that the system the sealing lip is particularly continuous and even, in particular under wear and Dichtigkeitsgesichts disadvantageous erratic courses of the Sealing lip avoided.

According to one further advantageous embodiment is the sealing element at least in the region which bears against the rotational body, with a wear-reducing Coating provided. For example, the sealing lip with Teflon (r) coated.

The rotary valve according to the invention is advantageously arranged in one of the previously described embodiment in an internal combustion engine, wherein the space is a combustion chamber of the internal combustion engine or of an internal combustion engine. This can generally be a any single or multi-cylinder combustion engine act, for example, an engine of the gasoline or diesel type. The internal combustion engine may be designed as a reciprocating or rotary piston engine. The sealing of the combustion chamber in the closed position located rotary valve is so particularly effective. The so designed rotary valve is also inexpensive to manufacture. Since generally in internal combustion engines, the valves are operated at high speeds, make the low wear and the reduced friction of the rotary valve according to the invention particularly advantageous for example in long service life and reduced consumption noticeable. In addition, the other advantages in the design of the rotary valve valve reasonable benefits of this valve come into play, such as comparatively low noise, low space expansion, low susceptibility and relatively low consequential damage, such as destroyed piston in valve failure.

The The invention further relates to an internal combustion engine with at least a rotary valve according to a the previously described embodiments and with the associated benefits, wherein the rotary valve in the inlet and / or Auslaßtrakt the Combustion engine is arranged. For example, the rotational body is at a reciprocating engine arranged in the combustion chamber above the piston, wherein the rotation axis of the rotation body is substantially perpendicular extends to the piston movement. The lateral surface of the rotational body is adjacent to the combustion chamber in one embodiment.

at an advantageous embodiment is the sealing element in one piece formed with a seal of the internal combustion engine, wherein the sealing element can be made particularly inexpensive. For example the sealing element integrated into the cylinder head gasket and forms together with the lateral surface of the rotational body of the rotary valve the completion of the combustion chamber on the of Piston remote side of the combustion chamber. The sealing lip can through the gasket or an undercut portion of the gasket are provided.

at In a further advantageous embodiment, the sealing element arranged between the cylinder head and cylinder block. This can do that Sealing element can be produced inexpensively. It is for example in the form of a sheet, e.g. is designed as a gasket sheet and is due to the clamping arrangement between cylinder head and cylinder block held. For additional Seal can also be provided a sealing element.

at a further embodiment is the sealing element in one piece formed with the cylinder head of the internal combustion engine. For example, points the cylinder head on the side of the room away from the piston or the combustion chamber from a recess, to which the lateral surface of the rotating body adjacent the rotary valve. In the recess, for example a circumferential, from the cylindrical body of revolution (Roll) tangentially pioneering undercut provided so that the Combustion chamber lying portion of the cylinder head acts as a sealing lip. The undercut is, for example, at a distance of 0.5 to 2 mm from the top of the combustion chamber. By integration of the sealing element or the sealing lip in the cylinder head can the Combustion engine with rotary valve produced particularly inexpensive become. The valve located on the side of the rotary valve, from the combustion chamber outlying portion of the undercut portion of the sealing element is configured in one embodiment, that it the deflection of as Limited sealing lip portion, wherein damage or Blockage of the rotary valve due to the limit thus reached the deflection is prevented to a maximum extent.

The The invention further relates to a method for the inlet and outlet of gases in an internal combustion engine. It is by a rotary motion one with a flow channel provided rotating body an open one Position reached to in this position by means of the flow channel To direct gases into and out of the combustion chamber. By another rotary motion becomes the rotation body moved to a closed position to the position in this position To seal the combustion chamber or the combustion chamber. There will be a flexible sealing lip of a sealing element in the closed position of the rotational body by pressurizing the combustion chamber in a voltage applied to the rotary body Positioned. The rotation of the rotating body can be continuous in one direction or sections with direction reversal. By the method according to the invention becomes a particularly effective, low-wear and low-friction mode of action achieved a rotary valve in an internal combustion engine.

Further advantageous embodiments of the invention are in the dependent claims and the following description of the figures.

It shows:

1 a sectional view of the rotary valve of the invention in an internal combustion engine.

The only 1 shows a rotary valve, which has a cylindrical, roller-shaped rotary body 1 having. Through the rotation body 1 runs as a passage designed flow channel 2 for those in a room 3 preferably a combustion chamber, to be admitted or omitted from the combustion chamber gases. In the illustrated embodiment, openings of the flow channel 2 in the lateral surface of the rotating body 1 intended. Alternatively, the flow channel 2 from an axial side of the rotating body 1 angularly to the remote on the lateral surface of the rotating body 1 lead the opening. In general, the rotational body 1 in an in 1 not shown cylinder head valve bore rotatably disposed, so that a small free space between the opposite surfaces of the bore and the rotating body 1 remains. In the 1 Alignment shown corresponds to the closed position of the rotary valve, since the flow channel 2 in the orientation shown no gas-conducting connection to the combustion chamber 3 essentially comprising a cylinder wall 4 , which in the present case is only intended to be indicated by sections, is limited.

The flow channel 2 will be by twisting the body of revolution 1 periodically align each for the inlet and outlet tract such that gases through the flow channel 2 in the combustion chamber 3 introduced or combustion gases are led out. The periodic and timely opening of the rotary valve allows the flow of a specified amount of air or an air-fuel mixture, depending on whether the fuel is supplied by injection or by means of a carburettor, through the rotary body 1 in the combustion chamber 3 and the expulsion of the combustion gases from there into a Ausschubleitung not shown during the intake and Ausschubakte the engine.

The lateral surface of the rotating body 1 serves to close the combustion chamber 3 during the combustion and compression stroke of the cycle. To a leak-free closing the rotary valve or a leak-free closure of the combustion chamber 3 to ensure is a flexible sealing lip 6 as part of a sealing element 7 intended.

By the in the combustion chamber 3 Forming compression pressure is the sealing lip 6 in a to the lateral surface of the rotating body 1 brought close position and thus closes the combustion chamber 3 from.

In the embodiment shown, the sealing element 7 formed integrally with a cylinder head gasket. Alternatively, the sealing element 7 also be part of a cylinder head. The sealing lip 6 is by one of the rotational body 1 away leading undercut 8th in the sealing element 7 , ie the cylinder head gasket, created.

The one from the combustion chamber 3 lying, undercut area 9 (in 1 the above the undercut 8th lying area) serves the sealing lip 6 as a support and prevents too much sagging of the sealing lip 6 that could potentially cause damage.

The sealing lip 6 is designed or arranged such that the sealing lip 6 in the relaxed state of the combustion chamber 3 not on the lateral surface of the rotating body 1 is present or spaced from this, so that during a rotational movement of the rotary body 1 advantageous friction and wear are reduced.

Claims (10)

Rotary slide valve for opening or closing a liquid or gas-conducting connection to a room ( 3 ), which rotatably mounted rotary body ( 1 ), with at least one flow channel provided therein ( 2 ), with an adjacent to the rotational body ( 1 ) arranged sealing element ( 7 ), wherein the rotary valve is designed such that the rotary valve by a rotary movement of the rotary body ( 1 ) is to be moved to an open position, by means of the flow channel ( 2 ) the connection with the room ( 3 ) and that by a further rotational movement of the rotary body, the rotary valve is to be moved to a closed position to the connection of the flow channel ( 2 ) with the room ( 3 ), characterized in that the sealing element ( 7 ) with a flexible sealing lip ( 6 ) is configured such that the sealing lip ( 6 ) at least in the closed position of the rotary valve by pressurizing the space ( 3 ) in one to the rotary body ( 1 ) position is to bring. Rotary slide valve according to claim 1, characterized in that the sealing element ( 7 ) with a substantially tangential to the body of revolution ( 1 ) away undercut ( 8th ), whereby the room ( 3 ) closer portion of the undercut portion of the sealing element ( 7 ) the sealing lip ( 6 ). Rotary slide valve according to claim 1 or 2, characterized in that the sealing element ( 7 ) is provided with a recess for the flow channel, wherein the sealing lip ( 6 ) the recess circumferentially, in the region of the lateral surface of the rotary body ( 1 ) is arranged. Rotary slide valve according to one of the preceding claims, characterized in that the sealing element ( 7 ) is designed such that the sealing lip ( 6 ) during a rotational movement of the rotary body ( 1 ) of the rotary body ( 1 ) is spaced. Rotary slide valve according to one of the preceding claims, characterized in that the rotary body ( 1 ) at the end regions pointing in the direction of the rotation axis at least in a contact region of the sealing lip ( 6 ) is flattened or curved. Rotary slide valve according to one of the preceding claims, characterized in that the sealing element ( 7 ) at least in the region which on the rotary body ( 1 ) is applied, provided with a wear-reducing coating. Combustion engine with at least one rotary valve according to one of the preceding claims, wherein the rotary valve is arranged in the inlet and / or outlet tract of the internal combustion engine. characterized by a sealing element ( 7 ) formed integrally with a gasket of the internal combustion engine. Combustion engine according to claim 7, characterized in that the sealing element ( 7 ) is disposed between a cylinder head and a cylinder block. Combustion engine according to claim 7, characterized in that the sealing element ( 7 ) is formed integrally with a cylinder head of the internal combustion engine. Method for the inlet or outlet of gases into an internal combustion engine, in particular according to one of the preceding claims, wherein, by means of a rotary movement, one with a flow channel ( 2 ) provided rotational body ( 1 ) designed rotary valve, in particular according to one of the preceding claims, an open position is reached, by means of the flow channel ( 2 ) Gases into or out of a room ( 3 ) or a combustion chamber, wherein the rotational body ( 1 ) is moved by a further rotational movement into a closed position to the space ( 3 ), characterized in that a flexible sealing lip ( 6 ) a sealing element ( 7 ) in the closed position of the rotary body ( 1 ) by pressurizing the room ( 3 ) in one to the rotary body ( 1 ) adjacent position is brought.