WO2019042649A1

WO2019042649A1 - Oil-separating and engine-ventilating device

Info

Publication number: WO2019042649A1
Application number: PCT/EP2018/069126
Authority: WO
Inventors: Jorge Soares; Christian Meyer; Heiko Bock
Original assignee: Polytec Plastics Germany Gmbh & Co. Kg
Priority date: 2017-09-01
Filing date: 2018-07-13
Publication date: 2019-03-07
Also published as: DE102017215365B4; DE102017215365A1

Abstract

An oil-separating and engine-ventilating device for internal combustion engines serves for separating oil from a gas-oil mixture or for ventilating the engine, depending on the operating state. For this purpose, the housing has at least one gas inlet opening (20) which is connectable to the crankcase, wherein a gas-oil mixture can flow in through the gas inlet opening (20). At least one gas outlet (32) is mounted downstream of at least one oil separator (22) in the direction of flow. Furthermore, at least one ventilating inlet (34) is provided which is connectable to the intake region of the engine. The ventilating outlets which are connected to the crankshaft housing correspond according to the invention to the gas inlets (20). Furthermore, at least one valve device (40) is arranged between the ventilating inlets (34) and the ventilating outlets (20).

Description

Oil Separator and Engine Ventilation Unit

The invention relates to a Ölabscheide- and engine ventilation device.

To clean crankcase ventilation gases, the use of oil separators is known to clean the escaping gas-oil mixture of oil. In this case, a phase separation is carried out by the small oil droplets, which have an order of lpm or less are deposited. In known oil separators, for example, a strong deflection of the gas-oil mixture, wherein the deflected stream is directed against a baffle, so that the fine oil droplets impinge on the baffle and unite there to larger drops. Larger drops of oil are then no longer entrained by the flow and are thereby separated from the gas-oil mixture. Such separation of oil discharged from the crankcase gas-oil mixture is required in particular when operating an internal combustion engine under full load.

Regardless of the cleaning of the crankcase ventilation gas, it must be ensured that the negative pressure in the engine is within a defined range. The object of the invention is to provide a cost Ölabscheide- and engine ventilation device.

The object is achieved according to the invention by a Ölabscheide- and engine ventilation device according to claim 1.

The Ölabscheide- and engine ventilation device for internal combustion engines according to the invention comprises a housing. The housing may have a plurality of housing parts. In particular, the housing has two housing halves. The housing has at least one gas inlet connectable to a crankcase of the internal combustion engine for supplying a gas-oil mixture. Furthermore, the housing has at least one gas outlet which can be connected to an intake region of the engine. At least one oil separator is arranged upstream of at least one gas outlet in the flow direction, so that the oil is separated from the gas-oil mixture between the at least one gas inlet and the at least one gas outlet and gas purified by the gas outlet can be supplied to the intake region of the engine.

According to the invention, the housing further comprises at least one ventilation inlet, the ventilation inlet is connectable to the intake of the engine, so that flows from the intake of the engine gas through the ventilation insert into the housing of the oil separation and motor ventilation device. Furthermore, the housing has at least one ventilation outlet which can be connected to the crankshaft housing of the internal combustion engine in order to ventilate the engine. Furthermore, at least one valve device is arranged between the ventilation inlet and the at least one ventilation outlet. The valve device is preferably designed such that starting from a predetermined negative pressure within the engine opening of the valve device and thus a venting of the engine takes place.

According to the invention, it is thus particularly advantageous that both the oil separation and the ventilation take place via one component or both the minimum at least one oil separator and the at least one ventilation device are arranged within a housing of a Ölabscheide- and motor ventilation device. As a result, the space is significantly reduced.

In a particularly preferred embodiment, the gas outlet for the purified gas-oil mixture before a throttle device of the intake of the engine is connected thereto. In particular, the connection is made directly with or in front of an exhaust turbocharger. In a particularly preferred embodiment, the ventilation inlet is connected to a region of the intake region of the engine which, in the main flow direction of the intake region, is also preferably arranged upstream of a throttle device upstream of an exhaust gas turbocharger. In a particularly preferred embodiment, it is the same line that is connected to the gas outlet of the oil separation and ventilation device. At least the particular more gas outlets of the device according to the invention and in particular a plurality of ventilation inlets can be merged into a common pipe or a common line, which is then connected to the corresponding preferred intake of the engine.

In order to create the most compact, space-saving design of the oil separation and motor ventilation device according to the invention, it is preferred that the at least one ventilation inlet is arranged between at least two gas outlets. If several ventilation inlets are provided, it is preferred that each of the ventilation inlets is arranged between at least two gas outlets. It is particularly preferred that the at least one ventilation inlet is surrounded by a plurality of gas outlets, wherein in turn when providing a plurality of ventilation inlets each ventilation inlet is surrounded by a plurality of gas outlets.

In a particularly preferred embodiment of the invention, two ventilation inlets are provided, which are preferably each between at least two gas outlets are arranged and are particularly preferably surrounded by a plurality of gas outlets.

Furthermore, it is preferred that the at least one valve device has a passage opening which is closed by a valve plate. If a plurality of valve openings are provided, it is preferred that one passage opening is provided per valve device, which is in each case closed by a valve plate. It is particularly preferred that in particular two valve plates are formed by a common spring element. In the preferred embodiment, the spring element is a spring plate. The spring plate, which is preferably flat in the unmounted state is preferably fixed by a clamping element in the housing of the Ölabscheide- and motor ventilation device that acts on each valve plate a biasing force. As a result, the valve plates are pressed against an edge region of the passage opening and thus close the passage openings. An opening of these passage openings takes place at a corresponding pressure difference, that is to say in particular when a predetermined negative pressure limit is reached within the engine. In this state, then a venting of the engine.

The at least one oil separator, which serves in particular under full load for cleaning the gas-oil mixture discharged from the crankshaft housing, has in a preferred embodiment a channel which tapers in the direction of flow. This serves to increase the flow velocity. In the case of several oil separators, each oil separator preferably has such a tapering channel.

The at least one oil separator further preferably has a deflecting element, by means of which a deflection of the gas-oil mixture takes place. The deflection is preferably carried out in the range of 90 ° ± 20 °. Subsequently, the diverted gas-oil mixture preferably flows against a baffle or the like, to separate the oil or to deposit the oil to realize from the gas-oil mixture. This results in a separation of the oil, as unite fine oil droplets to larger drops of oil and thus are no longer entrained by the air flow. These are then considered isolated.

In a particularly preferred embodiment, the deflection elements are designed such that they additionally close a flow opening of the oil separator pressure-dependent. The flow opening is preferably formed at the end of the tapered channel. The closing is preferably carried out in such a way that the deflecting element is designed as a spring element, in particular as a spring plate. Here, it is again preferred that the spring element is flat in the non-assembled state and held by a biasing member such as a web or a rib in the assembled state in the housing of Ölabscheide- and motor ventilation device such that the spring element with a biasing force against the at least one Flow opening is pressed.

Serves the invention Ölabscheide- and engine ventilation device for separating oil from the gas-oil mixture, which is supplied from the crankcase, the valve means of the aeration devices are closed. The deflection of the oil separator are open so that it is done by a corresponding deflection of the gas-oil mixture and separation of the oil. If the Ölabscheide- and motor ventilation device operated in its ventilation function, the deflection of the oil separator are arranged such that they close the flow opening. Due to the relatively high negative pressure in the engine compartment, the ventilation devices are opened, so that gas discharged from the intake region flows into the crankcase for ventilation.

The invention has the particular advantage that two functions are combined with one another by the oil separation and motor ventilation device according to the invention. This allows a very compact design achieved become . Furthermore, the construction is designed such that a low assembly cost and also a low material consumption can be achieved. Since only one component has to be tested for both functions (oil separation and ventilation), the testing effort is also reduced.

The invention will be explained in more detail with reference to a preferred embodiment with reference to the accompanying drawings. Show it :

1 is a schematic exploded perspective view of the parts of an embodiment according to the invention of the oil separation and motor ventilation device,

2 is a schematic longitudinal sectional view of the Ölabscheide- and motor ventilation device at rest,

Fig. 3 is a schematic longitudinal sectional view of the Ölabscheide- and engine ventilation device during engine ventilation and

Fig. 4 is a schematic longitudinal sectional view of the Ölabscheide- and engine ventilation device in the state as an oil separator.

The separation and motor ventilation device according to the invention has two housing halves 10, 12. Between these, an intermediate element 14 and two spring plates 16, 18 are arranged.

In the assembled state is shown in FIGS. 2 to 4 in different operating states each show a longitudinal section.

The housing part 10 has a plurality of gas inlets 20 which are connectable to the crankcase. The intermediate element 14 is designed such that it forms channels 24 for the formation of oil separators 22. The channels 24 are formed so as to taper downwardly in the flow direction of a gas-oil mixture entering through the gas inlets 20 in FIG. This results in an acceleration of the gas-oil mixture. The channels 24 form respective flow openings 26 at their outlets. These can each be closed by deflecting elements 28. The deflection elements 28 are formed by the spring plate 18, so that in the illustrated embodiment, all deflecting elements 28 are formed by a single component 18. The housing part 12 has a web or a rib 30, which presses against the spring plate 18, so that the deflection elements 28 are pressed against the flow openings 26 or close them.

Further, the housing member 12 with the flow openings 24 corresponding gas outlets 32, which are connectable to a suction of the engine.

Furthermore, in the illustrated embodiment, the housing component 12 has two ventilation inlets 34, wherein each ventilation inlet 34 is in each case surrounded by gas outlets 32 (FIG. 1). The intermediate element 14 of the housing has channels 36 corresponding to the ventilation inlets 34, each of which forms a passage opening 38. The passage opening 38 is in each case closed by a valve plate 40. The two valve plates 40 are part of the common spring plate 16 (FIG. 1). To produce a biasing force, which serves to make the spring plates 40 close the passage opening 38, the housing part 10 has a web or a rib 42.

If the oil separation and motor ventilation device according to the invention serves as a ventilation device, gas flows into the ventilation inlets 34 (FIG. 3). Due to the prevailing in this state in the engine compartment vacuum, the valve plates 40 are pressed against the biasing force generated by the web 42 in Fig. 3 upwards, so that the through hole 38 is open. In this way, the gas passes through the passage opening to the ventilation outlets 20. In the illustrated embodiment, the ventilation outlets 20 are identical to the gas inlets 20, so that the corresponding openings serve as aeration outlet or as a gas inlet depending on the operating condition. Of course, these could also be separate openings in the housing component 10.

The deflecting elements 28 of the oil separators 22 are closed in the operating state shown in FIG. 3, in which the motor is ventilated. If the oil separation and engine ventilation device fulfills the function of the oil separator, the flow conditions are as shown in Fig. 4. Here, a mixture of gas and oil enters through the now serving as gas inlet openings 20 openings in the housing member 10 a. Due to the pressure difference, the deflecting elements 28 are lifted off the flow-through openings 26, so that the gas-oil mixture flows through the channel 24 and is accelerated in the direction of the flow-through openings. Due to the deflecting element 28, the gas-oil mixture initially deflects by 90 ° outwards in the direction of a baffle 44 at least partially surrounding the deflecting elements 28. The baffle 9a and 9b again turn the gas flow 90 ° in FIG. 4 downwards the gas outlets 32 deflected. Due to the double deflection of the gas-oil mixture in the illustrated embodiment, the oil is separated, since the fine oil droplets unite on an inner side of the baffle 44 to form larger drops of oil and these are no longer entrained by the gas flow.

Claims

claims

Oil separation and engine ventilation device for internal combustion engines, comprising a housing (10, 12) with at least one connectable to a crankcase gas inlet (20) for a gas-oil mixture, at least one connectable to a suction of the engine gas outlet (32), at least one in Direction of flow of the gas-oil mixture the gas outlet (32) upstream oil separator (22), at least one connectable to the intake of the engine ventilation inlet (34), at least one connectable to the crankcase ventilation outlet (20) and at least one between the Ventilation inlet (34) and the ventilation outlet (20) arranged valve means (40).

Oil separation and engine ventilation device for internal combustion engines according to claim 1, characterized in that the at least one ventilation inlet (34) between at least two gas outlets (32) is arranged.

3. oil separation and engine ventilation device for internal combustion engines according to claim 1 or 2, that the at least one ventilation inlet (34) of a plurality of gas outlets (32) is surrounded.

4. Ölabscheide- and engine ventilation device for internal combustion engines according to one of claims 1 to 3, characterized in that two ventilation inlets (34) are provided, which are preferably each arranged between at least two gas outlets (32) and more preferably surrounded by a plurality of gas outlets (32) ,

5. Ölabscheide- and engine ventilation device for internal combustion engines according to one of claims 1 to 4, characterized in that a plurality of valve means (40) are provided, wherein in particular each valve means (40) has a through opening (38) occlusive valve plate (40).

6. Ölabscheide- and engine ventilation device for internal combustion engines according to claim 5, characterized in that in particular two valve plates (40) by a common spring element (16) in particular spring plate (16) are formed.

7. Ölabscheide- and engine ventilation device for internal combustion engines according to claim 6, characterized in that the spring element (16) is biased by preferably a single biasing element (42) for defined contact with the passage openings (38).

8. Ölabscheide- and engine ventilation device for internal combustion engines according to one of claims 1 to 7, characterized in that the at least one oil separator (22) has a tapered in the flow direction channel (24) for increasing the flow velocity.

9. Ölabscheide- and engine ventilation device for internal combustion engines according to one of claims 1 to 8, characterized in that the at least one oil separator (22) has a deflecting element (28) for deflection of the gas-oil mixture.

10. Ölabscheide- and engine ventilation device for internal combustion engines according to claim 9, characterized in that the deflecting element (28) in addition to a flow opening (26) of the oil separator (22) closes pressure-dependent.

11. Ölabscheide- and engine ventilation device for internal combustion engines according to claim 9 or 10, characterized in that the deflecting element (28) as a spring element (18) in particular spring plate (18) is formed.

12. Ölabscheide- and engine ventilation device for internal combustion engines according to claim 11, characterized in that the spring element (18) more in particular all flow openings (26) of a plurality of oil separator (22) closes.

13. Ölabscheide- and motor ventilation device for internal combustion engines according to claim 11 or 12, characterized in that the spring element (18) is biased by preferably a single biasing member (30) for defined contact with the flow openings (26).

14. Ölabscheide- and engine ventilation device for internal combustion engines according to one of claims 1 to 13, characterized in that the housing has at least two housing parts (10, 12).