JP5852561B2 - Lubricating oil pump, cylinder lubricating system, and internal combustion engine - Google Patents

Description

  The present invention relates to a cylinder lubricating oil pump and a lubricating oil pump for injecting cylinder lubricating oil into a quill hole of a cylinder of an internal combustion engine, in particular, a low-speed operation two-stroke large diesel engine, according to the preceding stage of each independent claim The present invention relates to a cylinder lubrication device having an internal combustion engine and an internal combustion engine.

  Large diesel engines are often used as power units for ships or in stationary operation, for example for driving large generators for the production of electric power. Here, in general, the engine is in continuous operation over a considerable period, which imposes a high burden on operation reliability and operation rate. For this reason, long intervals between services, low wear and the economic use of fuel and operating materials are especially important criteria for the operation of the machine. Among other things, the operating behavior of the pistons of such large-diameter low-speed operating diesel engines is directly related to the operating costs, with regard to the length of the interval between services, the utilization rate, and the consumption of lubricating oil, and therefore economically reasonable. Sex is also a determinant. Thus, the complexity of the problems associated with the lubrication of large diesel engines is becoming increasingly important.

  In large diesel engines, piston lubrication is performed by a reciprocating piston or cylinder wall lubrication device that reciprocates, thereby reducing friction between the piston and the sliding surface and wear of the sliding surface and piston ring. In order to minimize, lubricating oil is applied to the sliding surface of the cylinder wall. Thus, for modern engines, such as, for example, the WALTILA RTA engine, the wear on the running surface is less than 0.05 mm for 1000 hours of operation time. The amount of lubricant transferred is approximately 1.3 g / kWh or less and should be further reduced, but not the minimum for cost reasons, and wear should be minimized at the same time.

  With respect to the lubrication method as well as the actual operation of the lubrication device, completely different solutions of the lubrication system for lubricating the sliding surface are known. For example, the lubricating oil passes through the plurality of lubricating openings accommodated in the circumferential direction on the cylinder wall, and the lubricating oil is sprayed not only in the circumferential direction but also in the axial direction to the piston that has passed through the lubricating opening. Lubricating devices that are lubricated are known.

  Apart from the way in which the lubricating oil is supplied to the sliding surface of the cylinder wall, lubrication of the lubricating oil is an important point. For this reason, a wide variety of different oil lubrication pumps are known from the state of the art. In order to ensure uniform oil distribution to lubricate the cylinder quill of an internal combustion engine, known oil lubrication pumps drive a certain number of lubrication plungers attached or connected to the drive piston. It has a drive piston. The lubrication plunger is drivably disposed in the lubrication space so as to reciprocate delivery and return strokes over an operating stroke along the plunger axis. In the return stroke, a presettable amount of lubricating oil is filled in the lubrication space above the plunger. Simultaneously with receiving the injection signal, the drive piston starts to move, the lubricating oil is pressurized by the plunger driven by the driving piston, and the lubricating oil is supplied from the respective lubrication spaces to the respective lubricating quills.

  For example, such known cylinder oil lubrication pumps disclosed in Patent Documents 1, 2, or 3 are all very complicated in structure and are relatively expensive for the pump. Two-stroke marine diesel engines require a precisely timed, metered and independently supplied pulsed lubricating oil flow to multiple locations on the surface of each engine cylinder. Since each engine cylinder requires its own pump, such a pump must be manufactured as cheaply as possible and at the same time be as simple and reliable as possible. To meet this requirement, other pump proposals use only a single piston to supply multiple flows, but in this case it is not possible to guarantee a separate flow to each injection location in the engine cylinder. .

Swiss patent 673 506 German Patent No. 197 43 955 B4 European Patent Publication No. 1 386 063 A1

  The object of the present invention is therefore an improved cylinder for lubricating cylinder lubricating oil, the oil lubrication pump being simple in structure and more reliable like the pumps known from the state of the art, resulting in significant cost savings It is to propose an oil lubrication pump. It is also an object of the present invention to provide an improved cylinder lubrication device having an improved cylinder oil lubrication pump and an internal combustion engine having such a cylinder lubrication device.

  The subject matter of the invention which fulfills these objects is characterized by the features of the respective independent claims. Each dependent claim particularly relates to advantageous embodiments of the invention.

  Therefore, the present invention relates to a lubricating oil pump for injecting a presettable amount of cylinder lubricating oil into a lubricating quill hole of a cylinder of an internal combustion engine, particularly a two-stroke large diesel engine. The lubricating oil pump has a housing having a main hydraulic cylinder portion having a first axial end surface and a second axial end surface, and further has a primary piston portion in the main hydraulic cylinder portion. According to the invention, the primary piston parts form a lubrication volume for the injection bore and the injection piston arranged therein to fill a pre-settable amount of cylinder lubricating oil and to each other along the cylinder axis. It has an injection bore that receives the injection piston in such a way that it is relatively movable. Furthermore, the invention relates to a cylinder lubrication device and an internal combustion engine having a lubrication device according to the invention.

  In a variant of the advantageous embodiment, the primary piston parts are respectively connected to the respective injection pistons in such a way that the respective injection bores and the injection pistons arranged therein form a pre-settable quantity of cylinder lubricating oil. Has two or more injection bores to accept.

  The main hydraulic cylinder part usually has a main hydraulic cylinder bore, which is, for example, when the primary piston part or primary piston or piston plate is pressurized with working hydraulic oil and / or lubricated. To hydraulically drive the primary piston part or primary piston or piston plate in the main hydraulic cylinder bore and / or guide the primary piston part or primary piston along the cylinder axis in the main hydraulic cylinder bore And / or can be used to provide a sealing surface for the primary piston portion or primary piston.

  In an advantageous embodiment, the primary piston can be driven or moved by the secondary piston to perform the compression stroke and / or the refill stroke of the primary piston.

  The invention will be described in more detail with reference to the drawings.

2 is a special embodiment of a lubricating oil pump according to the invention. 2 is a second special embodiment of a lubricating oil pump according to the invention during pump refilling. 2 a second special embodiment of a lubricating oil pump according to the invention after a compression stroke;

  The primary piston 7 travels from end to end of the main hydraulic cylinder bore 4 with a stroke limited by the end surfaces 5, 6. At one end, the primary piston 7 has a plurality of closed injection (cylinder) bores 8 machined therein and into each injection bore 8 an injection piston 9 is inserted. Each injection piston 9 is fixed to the hydraulic cylinder housing 3 so that compression and vacuum are created within each injection bore 8 during the compression and refill strokes of the primary piston 7. Each injection bore 8 is connected via a small hole to its own axial groove V12 machined on the outer surface of the primary piston 7.

  During each trip of the primary piston 7, each axial groove V12 opens and closes with respect to the injection groove machined in the main hydraulic cylinder bore 4, and the lubricating oil 2 is applied to the injection bore 8 in which the lubricating volume V is established. It allows refilling and prevents the compressed oil 2 in each injection bore 8 from shorting back to the inlet side of the lubricating oil 2 circuit.

  During the compression stroke of the primary piston 7, the axial grooves V12 in the primary piston 7 are fed with compressed lubricating oil 2 from the injection bore 8, these grooves send the compressed lubricating oil 2 to the outlet check valve, From this check valve, a plurality of independent, metered, pulsating flows of lubricating oil 2 are produced.

  During the refill stroke of the primary piston 7, a vacuum is formed in each injection cylinder and this vacuum is used to replenish the injection bore 8 when the axial groove opens to the injection groove in the main hydraulic cylinder bore 4. .

  In an advantageous embodiment, the injection piston or injection pistons 9 do not move relative to the stationary surface 11 of the housing 3 and / or are fixed stationary to the stationary surface 11 of the housing 3. In a further advantageous embodiment, the primary piston part 7 is a primary piston 7 configured to reciprocate along the cylinder axis 10 in the main hydraulic cylinder bore 4 of the main hydraulic cylinder part.

  In another advantageous embodiment, the primary piston portion 7 does not move relative to the stationary surface 11 of the housing 3 and / or is fixed stationary to the stationary surface 11 of the housing 3. In a further advantageous embodiment, one injection piston or a plurality of injection pistons 9 are configured to be reciprocable along the cylinder axis 10 in the main hydraulic cylinder bore 4 of the main hydraulic cylinder part. One injection piston or a plurality of injection pistons 9 can be attached to the piston plate, for example, if necessary, and the piston plate can reciprocate along the cylinder axis 10 in the main hydraulic cylinder bore 4.

  Each lubrication volume V can be connected to a lubrication oil inlet V1 in order to supply a pre-settable amount of the lubrication oil 2 into the lubrication volume V irrespective of the above-described embodiments and variations of the embodiments. The lubrication volume V can further be connected to the lubrication oil outlet V2 respectively for supplying a pre-settable amount of the lubrication oil 2 to one lubrication quill hole or to a plurality of lubrication quill holes. The connecting pipe V12 is preferably provided to extend between the lubricating oil inlet V1 and the lubricating oil outlet V2 so that the lubricating volume V can be alternately connected to the lubricating oil inlet V1 or the lubricating oil outlet V2.

  One injection piston or a plurality of injection pistons 9 is a cylinder of a pre-settable quantity, with compression of the lubricating oil 2 being made in one injection bore or a plurality of injection bores 8 during the compression stroke of the primary piston part 7. The lubricating oil 2 is advantageously fixed to the fixing surface 11 in such a way that it is supplied to one or more lubricating quill holes in the cylinder of the internal combustion engine.

  During the refilling stroke of the primary piston portion 7, a vacuum is created in one injection bore or a plurality of injection bores 8 and a presettable amount of cylinder lubricating oil 2 is contained in one injection bore or a plurality of injection bores 8. It may be further advantageous to fix one injection piston or a plurality of injection pistons 9 to the fixed surface 11 in such a way that they are fed into the lubricating volume V of the cylinder.

  In a variant of the advantageous embodiment, the first working surface 701 and / or the second working surface 702 of the primary piston 7 can be pressurized by the working hydraulic oil 12 in order to carry out the compression stroke of the primary piston 7. In a further advantageous embodiment variant, the first working surface 701 and / or the second working surface 702 of the primary piston 7 can be pressurized by the working hydraulic oil 12 in order to carry out a refilling stroke of the primary piston 7. .

  In another advantageous embodiment variant, the first working surface 701 and / or the second working surface 702 of the primary piston 7 are spring-loaded to perform the compression stroke and / or the refilling stroke of the primary piston 7. Can be pressed.

  One injection piston or a plurality of injection pistons 9 can be applied, for example, to the first axial end surface 5 or the second axial end surface 6 of the main hydraulic cylinder bore 4, irrespective of the above-described embodiments and variations of the embodiments. Can be stationary and fixed. One injection piston or a plurality of injection pistons 9 can further be an integral part of the housing 3 or can be removably fixed to the housing 3.

  In a further advantageous embodiment variant, the primary piston 7 can perform a compression stroke on the first axial end surface 5 and at the same time a refilling stroke on the second axial end surface 6. A double-acting primary piston that can be implemented or vice versa.

  The lubrication volume V can be advantageously adjusted independently of the embodiments described above and variations of the embodiments.

  2A and 2B show a second special embodiment of a lubricating oil pump according to the invention, FIG. 2A represents a lubricating oil pump during refilling of the pump, and FIG. 2B represents a lubricating oil pump after a compression stroke. . In the illustrated embodiment, a lubricating oil pump 1 for injecting a pre-settable amount of cylinder lubricating oil into a lubricating quill hole of a cylinder of an internal combustion engine such as a two-stroke large diesel engine has a first axial end surface. 5 and a housing 3 having a main hydraulic cylinder part 4 having a second axial end surface 6 and a primary piston part 7 in the main hydraulic cylinder part 4. According to the invention, the primary piston part 7 forms a lubricating volume V for injecting a pre-settable amount of cylinder lubricating oil 2 by each of the injection bores 8 and the injection pistons 9 arranged therein, and cylinder shafts. 10 has at least one injection bore 8 each receiving an injection piston 9 in such a way that it can be moved relative to each other along.

  In an advantageous embodiment, the first working surface 701 and / or the second working surface 702 of the primary piston 7 can be pressurized by a spring to perform the compression stroke and / or the refill stroke of the primary piston 7.

  In a further advantageous embodiment, the primary piston 7 can be driven or moved by a secondary piston 72, as shown in FIGS. 2A and 2B, in order to perform the compression stroke and / or the refill stroke of the primary piston 7. It is. The secondary piston 72 can be configured to reciprocate along the cylinder axis 10 within the secondary hydraulic cylinder bore 42, for example, and the secondary hydraulic cylinder bore typically has a smaller diameter than the main hydraulic cylinder bore 4. At the same time, it is preferable that the hydraulic oil 12 can be pressurized to perform a driving motion along the cylinder shaft 10.

  The lubricating oil pump 1 may optionally have a sensor 2a that monitors the pulsating flow of the lubricating oil 2 of the pump, regardless of the above-described embodiments and variations of the embodiments.

  With respect to additional design items and possible advantageous embodiments and variations of the embodiments, within the scope of the first embodiment, reference is made to the design items, embodiments and variations described above.

  The function of the lubricating oil pump 1 according to the second special embodiment is described in detail below using FIGS. 2A and 2B. 2A and 2B, the primary piston 7 is connected to the secondary piston 72 so that the primary piston 7 can reciprocate along the cylinder shaft 10 within the main hydraulic cylinder bore 4.

  At one end, the primary piston 7 has a plurality of closed injection (cylinder) bores 8 which can be machined, for example, in the primary piston and in each injection bore 8. 9 is inserted. Since each injection piston 9 is fixed to the hydraulic cylinder housing 3, during the compression and refill stroke of the primary piston 7, compression and vacuum are respectively created inside each injection bore 8. Each injection bore 8 is connected via a small hole to its own axial groove V12 machined on the outer surface of the primary piston 7.

  In the refill position of the primary piston 7, each axial groove V12 opens with respect to the injection groove machined in the main hydraulic cylinder bore 4 and into the injection bore 8 with a lubrication volume V established as shown in FIG. 2A. It is possible to refill the lubricating oil 2.

  During the compression stroke of the primary piston 7, the secondary piston 72 is pressurized by the working hydraulic oil 12 in order to carry out a driving movement along the cylinder shaft 10 and thus to drive the primary piston 7. When the primary piston 7 is moving, the axial groove V12 in the primary piston 7 is normally closed with respect to the injection groove so that the compressed oil 2 in each injection bore 8 is on the inlet side of the lubricating oil 2 circuit. To prevent short circuit to return. At the same time, the axial groove V12 in the primary piston 7 is supplied with the compressed lubricating oil 2 from the injection bore 8, which sends the compressed lubricating oil 2 to the outlet check valve from which the lubricating oil Two independent, metered, pulsatile flows each occur.

  The compression stroke of the primary piston 7 is adjusted by the second end surface 6 of the main hydraulic cylinder bore 4 and / or via the secondary piston 72 and / or as shown in FIG. 2B. Limited by an adjustable stop device that makes it possible. The stop device can have, for example, a pin with a thread.

  During the refilling stroke of the primary piston 7, it is recognized that the hydraulic fluid 12 acting on the secondary piston 72 is released, while the second working surface 702 of the primary piston 7 performs the refilling stroke of the primary piston 7. Pressurized by a spring. During the movement of the primary piston, a vacuum is formed in each injection cylinder 8 and this vacuum is injected when the primary piston reaches the refill position and the axial groove V12 opens with respect to the injection groove in the main hydraulic cylinder bore 4. Used to refill the bore 8.

  The refilling stroke of the primary piston 7 is caused by the first end surface 5 of the main hydraulic cylinder bore 4 and / or via the secondary hydraulic piston 72 at the end surface of the secondary hydraulic cylinder bore 42 and / or Limited by or with an adjustable stop device which makes it possible to adjust the lubricating volume V. The stop device can have, for example, a pin with a thread.

  The present invention further includes a cylinder lubrication device having a lubricating oil pump 1 according to any of the above-described embodiments and variations of the embodiments. In an advantageous embodiment of the cylinder lubrication device, a pressurizable oil supply connected to the lubricating oil inlet V1 of the lubricating oil pump 1 is provided. The pressurizable oil supply can be, for example, a common rail accumulator.

Furthermore, the present invention includes an internal combustion engine such as a two-stroke large diesel engine having a lubricating oil pump 1 according to any of the above-described embodiments and variations of the embodiments, or having a cylinder lubricating device according to the above-described embodiments. .

Claims (16)

A housing having a main hydraulic cylinder portion having a first axial end surface and a second axial end surface for injecting a pre-settable amount of cylinder lubricating oil into a lubricating quill hole of a cylinder of an internal combustion engine; Further, a lubricating oil pump having a primary piston portion in the main hydraulic cylinder portion,
The primary piston portion forms a lubrication volume for each of the injection bores and the injection piston disposed therein to inject the preset amount of the cylinder lubricating oil, and each of the injection bores and the injection pistons At least two injection bores each receiving said injection piston in such a way as to be movable relative to each other along a cylinder axis;
Each injection bore is connected through a small hole to an axial groove machined in the outer surface of the primary piston portion, and during the relative movement, each axial groove is in the main hydraulic cylinder portion. Connected and disconnected respectively to the machined injection groove,
The injection piston does not move relative to a stationary surface of the housing and / or is fixed stationary to the stationary surface of the housing;
Lubricating oil pump. The primary piston portion is a primary piston configured to be capable of reciprocating along the cylinder axis in a main hydraulic cylinder bore of the main hydraulic cylinder portion;
The lubricating oil pump according to claim 1. The injection piston is configured to reciprocate along the cylinder axis in a main hydraulic cylinder bore of the main hydraulic cylinder portion, and one injection piston or a plurality of the injection pistons are arranged in the main hydraulic cylinder bore in the main hydraulic cylinder bore. Ru mounted on reciprocable piston plate along the axis,
The lubricating oil pump according to claim 1 or 2. The lubrication volume is connectable to a lubrication oil inlet to supply the pre-settable amount of the lubrication oil into the lubrication volume, and / or the lubrication volume is the presettable amount of Connectable to a lubricating oil outlet to supply the lubricating oil to the lubricating quill hole;
The lubricating oil pump according to any one of claims 1 to 3.   Lubrication according to claim 4, wherein the axial groove is provided between the lubricating oil inlet and the lubricating oil outlet so that the lubricating volume can be alternately connected to the lubricating oil inlet or the lubricating oil outlet. Oil pump. During the compression stroke of the primary piston portion, compression of the lubricating oil is made in the injection bore and the presettable amount of the cylinder lubricating oil is supplied to the lubricating quill hole of the cylinder of the internal combustion engine. In such a way, the injection piston is fixed to a fixed surface,
The lubricating oil pump according to any one of claims 1 to 5. The first working surface and / or the second working surface of the primary piston can be pressurized with working hydraulic fluid to perform a compression stroke of the primary piston and / or the primary piston of the primary piston. The first working surface and / or the second working surface can be pressurized by the working hydraulic fluid to perform a refill stroke of the primary piston.
The lubricating oil pump according to any one of claims 1 to 6. The first working surface or the second working surface of the primary piston can be pressurized by a spring to perform the compression stroke and / or the refill stroke of the primary piston.
The lubricating oil pump according to any one of claims 1 to 7. The primary piston is movable by a secondary piston to perform a compression stroke or refill stroke of the primary piston;
The lubricating oil pump according to any one of claims 1 to 8. The secondary piston is configured to reciprocate along the cylinder axis in a secondary hydraulic cylinder bore, the secondary hydraulic cylinder bore having a smaller diameter than the main hydraulic cylinder bore, and a driving motion along the cylinder axis Can be pressurized with hydraulic oil to perform
The lubricating oil pump according to claim 9. The injection piston is fixed stationary on the second axial end surface of the main hydraulic cylinder bore, or the injection piston is fixed stationary on the first axial end surface of the main hydraulic cylinder bore To be
The lubricating oil pump according to any one of claims 1 to 10. The primary piston can perform a compression stroke on the first axial end surface and at the same time a refill stroke on the second axial end surface, or vice versa. This is a double acting primary piston.
The lubricating oil pump according to any one of claims 1 to 11. The lubricating volume is adjustable;
The lubricating oil pump according to any one of claims 1 to 12.   A cylinder lubricating device having the lubricating oil pump according to any one of claims 1 to 13. A pressurizable oil supply source connected to a lubricating oil inlet of the lubricating oil pump is provided, and the pressurizable oil supply source is a common rail accumulator;
The cylinder lubricating device according to claim 14. An internal combustion engine having the lubricating oil pump according to any one of claims 1 to 13, or having the cylinder lubricating device according to claim 14 or 15.

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