EP1058777B1 - Oil pickup system for an internal combustion engine, notably a single-cylinder diesel engine - Google Patents

Description

The invention relates to an oil intake system for an internal combustion engine according to the preamble of claim 1.

An important criterion for the maximum permissible inclination when operating internal combustion engines is the lubricating oil system. If a critical inclination is exceeded Internal combustion engine, it is important to avoid the oil pump Air sucks in and that the deep in the crankcase Engine parts hit in the oil, causing the engine to heat up Lubricating oil leads and also the oil reflux e.g. from the rocker arm housing hindered in the oil pan. After all, oil can in case of strong inclinations through the crankcase ventilation get into the combustion air intake system, which in extreme cases in diesel engines to engine damage can lead to a no longer controllable speed increase.

Extreme sloping positions of the internal combustion engine occur, for example when used as a vehicle drive. there an attempt was made to address the above issues Avoid the oil level using a deeper oil pan was lowered. Through particularly deeply trained oil pans Although the disadvantages listed largely succeed avoid. Such special oil pans cause high Manufacturing costs and limit the use of the engine because of its larger space requirement.

In a known oil intake system (FR-A 2196004) the entry mentioned type are the control valves each at the inner ends of the oil intake pipes, i.e. close to the center the oil pan. There is therefore a risk that the control valves only respond with a delay, so that a suction of Residual air volumes must be accepted.

The present invention is therefore based on the object to provide an oil intake system which the Avoids the disadvantages mentioned above and which in particular sensitive enough to also suck in air To be avoided reliably in the case of strong inclinations.

This task is accomplished through an oil intake system with the features of claim 1 solved. Advantageous embodiments are described in the subclaims.

According to the invention, the oil intake system has at least three Oil intake pipes with at least four intake heads are connected to the oil pump via a suction pipe and the in the oil pan are arranged in such a way that the Internal combustion engine sucking air through in the oil intake pipes arranged control valves is prevented. there the control valves are advantageous than known per se Plate valves (DE-C-711575 or DE-B-1054292) are formed and arranged so that when "normal" horizontal Position of the oil pan are open. With extreme inclination the oil pan, however, are only those control valves opened, which are wetted with oil. All other control valves remain closed. The oil intake system according to The present invention is in existing internal combustion engines easy to retrofit by simply using the oil pan and the normal suction basket are to be dismantled and the latter through the oil intake system according to the present invention is replace. The regulation of the control valves can be mechanical or in another suitable manner.

The fact that in the present invention, the control valves slidable under gravity on sliding rods arranged valve plates and arranged on the pipe ends Having valve seats will be simple, but still sensitive responsive mechanical Gravity control of the valves implemented. In addition to the desired automatic opening and closing positions of the control valves, depending on the inclined position, has these Gravity control also has a "fail-safe" function because a simultaneous closing of all valves by the Arrangement of two valve plates on a common one Push rod is safely prevented.

An advantageous embodiment of the invention provides that three oil intake pipes are arranged in an H-shape and the have two suction heads on each side tube. By this arrangement ensures that in any tilt position There is enough oil at least at one corner of the oil pan is to ensure a suction of oil without air. The In this case, for example, the intake manifold can be centered over a Flange with the connecting pipe between the two Side tubes can be arranged.

Further advantageous embodiments of the invention Oil intake system can by the X, Z or square arrangement of the oil intake pipes are formed. It is important that at all corners of the oil pan, in which the oil level can collect at inclined positions, there is at least one suction head. Depending on the shape the oil pan can do this, for example, by a triangular, polygonal or star - shaped arrangement of the Oil intake pipes may be possible.

Another advantageous embodiment of the present Invention provides that the suction heads against one Have the floor facing the suction opening. Without one such a design would have to have no air to suck, a minimum oil level the size of the Pipe diameter are available. An even lower oil level is only in accordance with the oil intake openings below the advantageous embodiment possible.

It is also advantageous that on the suction heads Filter screens are arranged. This will cause suction prevents contamination in the oil sump.

Finally, an advantageous embodiment provides that a check valve at the transition between the intake manifold and Oil pump seat is arranged to idle the Intake manifold and pump room closed when the engine is stopped prevent.

Fig. 1

eine schematische Draufsicht auf ein Ölansaugsystem gemäß der vorliegenden Erfindung im Schnitt;

Fig. 2

eine schematische Seitenansicht aus Richtung A-A in Fig. 1 im Schnitt, wobei sich die Ölwanne in horizontaler Lage befindet und

Fig. 3

eine Ansicht gemäß Fig. 2, jedoch bei gekippter Ölwanne.

An embodiment of the present invention is described below with reference to the accompanying drawings. In it show:

Fig. 1

a schematic plan view of an oil intake system according to the present invention in section;

Fig. 2

a schematic side view from the direction AA in Fig. 1 in section, wherein the oil pan is in a horizontal position and

Fig. 3

a view of FIG. 2, but with the oil pan tilted.

In Fig. 1 is an embodiment of an inventive Oil intake system shown, which in an oil pan 24th is installed. The oil pan 24 is located in one Oblique position, so that the oil level S1 only the Suction head 19 of the tube 28 is washed around. The H-shaped trained oil intake system consists of three Oil intake pipes 26, 27, 28, each one axially displaceable sliding rod 1, 2, 3 have valve plates 4 at each of their two ends, 5, 6, 7, 8, 9 are arranged. In the position shown the valves of the oil intake pipe 27 are open, although they are not wet with oil. To suck in air This is prevented by valve plate 4 and valve seat 30 formed valve of the tube 26 closed and that on arranged at the other end of the push rod Valve plate 5 and valve seat 31 formed valve opened. The valve rod 1 is via the axial bearings 10, 11 axially displaceable. The oil intake pipe 28 has how already mentioned, the opened by valve plate 8 and Valve seat 34 formed control valve and by Valve plate 9 and valve seat 35 formed closed Control valve on. Both valve plates 8, 9 are on the axially displaceable sliding rod 3 connected in the bearings 14, 15 is movably mounted. The two Side tubes 27, 28 also have filter screens 20, 21, 22, 23 on. Furthermore, the bearings 12, 13 of the slide rod 2 in Tube 27 shown. At the ends of the slide bar 2 are valve plates 6, 7 with the valve seats 32, 33 arranged.

The oil flow is shown in Fig. 1 by the arrows 36. The outlet opening 29 is also shown in FIG. 1, which are arranged centrally on the top of the suction pipe 26 is and with the suction pipe 43, not shown, also Oil pump 45, not shown, is connected. In the The inclined position shown moves the valve plates 5 and 8 due to gravity in their open position, the valve plates 4 and 9 via the slide rods 1 and 3 are moved to their closed position. This ensures that in the now only on Intake head 19 open intake system no air is sucked in becomes. The position of the valves in the oil intake pipe 27 is in the oblique position shown in Fig. 1 irrelevant, since the Tube 27 completely through the closed valve plate 4 from remaining oil intake system and thus in particular from the Exit opening 29 is uncoupled.

FIG. 2 schematically shows the oil intake system from FIG. 1 in a side cut, which is on the crankcase 52 attached oil pan 24 is in the horizontal position, i.e. the oil level S2 is parallel to the tub floor 40. In in this position are the valve plates 4, 5 of the tube 26 both open, i.e. lifted off the valve seats 30, 31. The pipes 27 and 27 connected to pipe 26 via flanges 25 28 and the slide rods 2, 3 are in section shown. Are also in the two side tubes 27, 28 both valves open so that all four suction heads 16, 17, 18, 19 oil is sucked in. Between the Crankcase 52 and the oil pan 24 is also one Fixed support plate 41, which has a plurality of openings 42, that allow unhindered oil flow. In the middle the plate 41 has a suction pipe 43 for an oil pump 45, as shown, a gear pump, the Housing is attached to the plate 41. That from the pump 45 oil pumped to the point of use of the machine into a pressure pipe 46. The suction pipe 43 is at the lower end formed as a flange 44 which for attaching a elongated, parallel to the bottom 40 of the tub 24 arranged, hollow and cylindrical tube 26 is used. The Tube 26 has a mounting flange for this purpose 49. Inside the flange 44 is on a pin 50 tiltable plate valve 51 is provided, which in the rest position the machine rests on the flange 49 and the Reflux of the oil from the suction pipe 43 and the pump 45 prevented. In the tube 26 is a slide rod 1 Slidably mounted axially parallel. To the required Smooth running of the rod 1 during its To secure displacement movement, two bearings 10, 11, e.g. Ball bearing, in two perforated cross flanges 47, 48 of the Tube 26 provided. The rod 1 carries one at each end flat valve plate 4, 5, each with a Valve seat 30, 31 formed annular surface at each end of the tube 26 cooperates.

Fig. 3 shows the oil intake system according to FIG. 2, but in tilted position so that the oil level S3 in the right lower corner. This is the case, for example, when a vehicle drives up a steep slope and the Oil pan 24 an approximately at an angle of 45 ° to the horizontal assumes an inclined position. The oil collects in the lower right corner of the oil pan 24, the oil level S3 again lies horizontally. The rod 1 takes Effect of gravity the position shown in Fig. 2 in which the valve plate 5 from the valve seat 31 is moved away and the oil supply to the pump 45 via that in oil fully immersed tube 28 and the arranged thereon Suction heads 18, 19 takes place. The oil pump 45 can also in this extreme inclination of a vehicle and thus also the oil pan 24 of the internal combustion engine no air, but just suck in oil.

Claims (6)

1. Oil suctioning system for a combustion engine, especially a one-cylinder diesel motor, incorporating an oil sump (24) and an oil conveying pump (45), whereby the suctioning system further incorporates at least three oil suctioning pipes (26, 27, 28) with at least four suctioning heads (16, 17, 18, 19), whereby the same are connected to the oil conveying pump (45) via a suctioning pipe (43), and whereby the same are positioned within the oil sump (24) in such a way that the suctioning of air through the control valves allocated to the oil suctioning pipes is prevented during a tilting of the combustion engine, and whereby the control valves are activated with the aid of displacement rods (1, 2, 3) displaced with the aid of gravity, and whereby the control valves incorporate valve closure elements that co-operate with valve seats (30, 31, 32, 33, 34, 35), characterised in that the valve closure elements are formed by valve plates (4, 5, 6, 7, 8, 9) which co-operate with the valve seats (30, 31, 32, 33, 34, 35), and in that the pipe ends and the control valves are positioned in the comers of the oil sump, whereby two valve plates each are connected with one displacement rod.
2. Oil suctioning system according to Claim 1, characterised in that three oil suctioning pipes (26, 27, 28) are positioned in a H-shaped formation, and in that the two side pipes (27, 28) each incorporate two suctioning heads (16, 17, 18, 19) at their ends.
3. Oil suctioning system according to Claim 1, characterised in that the oil suctioning pipes are arranged in an X-, Z- or square-shaped formation.
4. Oil suctioning system according to Claim 1, characterised in that the suctioning heads (16, 17, 18, 19) each incorporate a suction opening facing in the direction of the sump floor (40).
5. Oil suctioning system according to Claim 1, characterised in that filter sieves (20, 21, 22, 23) are located at the suctioning heads (16, 17, 18, 19).
6. Oil suctioning system according to Claim 1, characterised in that a non-return valve (29, 51) is located between the suctioning pipe and the oil pump, for the preventing of an emptying of the suctioning and pump space when the motor is idling.

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