JP2008248720A - Oil supply device for intake/exhaust valve stem of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce occurrence of failure to enhance reliability, and largely reduce a manufacturing cost and a maintenance cost. <P>SOLUTION: An oil supply device comprises: a main valve 11 performing intake/exhaust; an auxiliary valve 21 switching between intake and exhaust passages 3, 4; a main valve air piston 14 for restoration operation of operation of the main valve; an auxiliary valve air piston 24 for restoration operation of the operation of switching operation of the auxiliary valve; an air spring chamber 26 storing working air of the main valve air piston and the auxiliary valve air piston; a seal 30 interposed between the main valve stem 12 and the auxiliary valve stem 22; and an oil supply part forcibly supplying lubricating oil in the air spring chamber. The oil supply part comprises: a check valve 34 opened when hydraulic pressure of the lubricating oil supplied from a hydraulic pressure control mechanism 10 exceeds predetermined pressure P<SB>0</SB>; an outer cylinder part 36, and an inner fitting part 37 fitted in the outer cylinder part with a minute clearance from the outer cylinder part; and a nozzle 35 supplying the lubricating oil into the air spring chamber through the minute clearance. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an oil supply device for an intake / exhaust valve stem of an internal combustion engine.

  In a low-speed diesel engine as an example of an internal combustion engine, as shown in FIG. 7, the intake / exhaust valve opening operation is performed by a hydraulic cylinder 101 operated by high-pressure oil pressure pushing the valve stem 102 downward in the drawing. It is. The valve closing operation is performed by the air piston 103 attached to the valve stem 102 pulling up the valve stem 102 upward in the figure. That is, in this low-speed diesel engine, the air in the air spring chamber 104 formed below the air piston 103 is the operating source for the valve closing operation of the main valve.

  The valve stem 102 is slidably fitted in a circular stem support portion 106 fixed to the casing 105. In addition, a special seal ring 107 is interposed between the valve stem 102 and the stem support portion 106, and the air in the air spring chamber 104 is passed between the valve stem 102 and the stem support portion 106 by the seal ring 107. I try not to leak.

  Engine gas easily enters between the valve stem 102 and the stem support portion 106 from the intake / exhaust valve side. For this reason, the valve stem 102 is provided with wear prevention measures such as hard chrome plating. However, there is still a problem that abnormal wear due to the swing occurs in the portion where the seal ring 107 of the valve stem 102 swings.

  For this reason, in a conventional oil supply device for an intake / exhaust valve stem of an internal combustion engine, high-pressure lubricating oil supplied from a hydraulic control mechanism of a main valve is led to a control valve 110 provided in the upper part of the figure, and the control valve 110 is The seal ring is lubricated by supplying high-pressure lubricating oil between the valve stem 102 and the stem support 106 near the seal ring.

  As shown in FIGS. 8 and 9, in the control valve 110, when high-pressure engine lubricating oil is supplied from the hydraulic control mechanism of the main valve, the oil supply piston 111 in FIG. Acts against. Accordingly, the communication position of the groove 114 of the switching unit 113 is switched so as to communicate with the extrusion cylinder 115 in FIG. As a result, the high-pressure lubricating oil enters the inside of the push-out cylinder 115 against the urging force of the spring 116 in FIG. 8 and fills it.

  When the high-pressure hydraulic pressure supplied from the main valve hydraulic control mechanism is interrupted due to the end of the valve opening operation of the main valve, the communication position of the groove 114 of the switching unit 113 in FIG. It is switched to the oil passage that leads to At the same time, the high-pressure lubricating oil filled in the extrusion cylinder 115 in FIG. 8 is supplied to the oil passage leading to the seal ring by the biasing force of the spring 116. The supply of the lubricating oil to the seal ring is instantaneously performed only once for a single valve opening operation of the main valve.

  On the other hand, in a medium speed diesel engine as an example of an internal combustion engine, as disclosed in Japanese Patent Publication No. 8-16443 (Patent No. 2117087), the supply of fuel to the cylinder and the exhaust of gas from the cylinder are performed. There is a main valve to perform, and a sub-valve that switches between an intake passage and an exhaust passage leading to the main valve at the time of supply and exhaust, respectively, thereby enabling both intake and exhaust by one main valve .

  In an engine having a sub valve in this way, a hydraulic cylinder that is operated by high-pressure hydraulic pressure pushes the main valve stem and the sub valve stem to perform the main operation, and the main valve and the sub valve The return movement is performed by two air pistons attached to the main valve stem and the secondary valve stem, respectively. The main valve air piston and the sub-valve air piston work together to form one air spring chamber, and form an operating source for the return operation of the main valve and the sub-valve.

  Further, the above-mentioned main valve stem is fitted inside the hollow sub valve stem in an airtight and slidable manner, and between the main valve stem and the sub valve stem, the above low speed diesel engine is fitted. As in the case of the engine, a special seal ring is interposed, and this seal ring prevents air in the air spring chamber from leaking from between the main valve stem and the sub valve stem.

However, this seal ring is interposed between the main valve stem and the sub valve stem that reciprocally move relative to each other, and is not fixed to the casing or the like as in the case of the low-speed diesel engine described above. Therefore, direct lubrication to the seal ring is structurally difficult, and no special lubrication device is provided in the conventional medium-speed diesel engine, and slight lubrication entering the air spring chamber from around the main valve air piston. Oil is used, and the lubricating oil adheres to the main valve stem, whereby the seal ring is lubricated.
Japanese Patent Publication No. 8-16443

  As described above, a conventional oil supply device for an intake / exhaust valve stem of a low speed diesel engine supplies high-pressure engine lubricating oil supplied from a hydraulic control mechanism of a main valve from an oil supply piston 111, a switching unit 113, an extrusion cylinder 115, and the like. The control valve 110 is supplied to a seal ring 107 interposed between the valve stem 102 and the stem support portion 106 and lubricated.

  However, the control valve 110 includes a number of components such as springs 112 and 116 and a piston stopper in addition to movable parts such as the oil supply piston 111 and the push-out cylinder 115. For this reason, there are problems that malfunctions such as malfunctions are likely to occur, and manufacturing and maintenance costs are extremely high.

  On the other hand, in a conventional oil supply device for an intake / exhaust valve stem of a medium speed diesel engine having a main valve and a subvalve, as described above, it is interposed between the main valve stem and the subvalve stem that reciprocate relative to each other. It is structurally difficult to directly lubricate the sealed ring, and no special lubrication device is provided. For this reason, only a small amount of lubricating oil entering the air spring chamber from around the main valve air piston is utilized, and lubrication is merely performed by this lubricating oil.

  However, although the amount of lubricating oil entering the air spring chamber is originally small, the lubricating oil does not collect in the air spring chamber and leaks out from the surroundings of the sub-valve air piston. Prone to lack of lubricating oil. For this reason, wear prevention measures such as hard chrome plating are carried out on the main valve stem, but there is a problem that abnormal wear may occur if the output of the engine in the future is taken into consideration.

  Therefore, for an internal combustion engine having such a main valve and a sub valve, it is indispensable to introduce a lubricating device that is less likely to fail and highly reliable, and that is inexpensive to manufacture and maintain.

  The present invention has been made to solve such problems, and has a simple apparatus configuration and a small number of parts. Therefore, the occurrence of failure is low, the reliability is high, and the manufacturing and maintenance costs are greatly reduced. An object of the present invention is to provide an oil supply device for an intake / exhaust valve stem of an internal combustion engine.

  In order to solve the above-described problems, the means employed by the present invention includes a main valve that operates by a hydraulic control mechanism to perform intake and exhaust of an engine cylinder of an internal combustion engine, and an operation of the main valve through an intake and exhaust passage that leads to the engine cylinder. The main valve air piston that is fixed to the main valve stem to restore the operation of the main valve and the auxiliary valve stem that is fixed to the stem of the sub valve to perform the recovery operation of the sub valve switching operation A sub-valve air piston, a main valve air piston, a sub-valve air piston, and an air cylinder of the casing, and an air spring chamber for accommodating the main valve air piston and the operating air of the sub-valve air piston; and a main valve stem; An oil supply device for an intake / exhaust valve stem of an internal combustion engine having a seal interposed between the auxiliary valve stem and preventing air leakage from the air spring chamber. The oil supply section is further provided for forcibly supplying oil into the air spring chamber, and the oil supply section opens when the oil pressure of the lubricant supplied from the hydraulic control mechanism exceeds a predetermined pressure to seal the lubricant to the seal. It has a check valve to be supplied, an outer cylinder part, and an inner fitting part that is fitted inside the outer cylinder part with a minute gap, and supplies lubricating oil supplied from the check valve to the oil passage through the minute gap. And a nozzle to be used.

  Alternatively, the means adopted by the present invention includes an intake / exhaust valve that operates by a hydraulic control mechanism to intake and exhaust the engine cylinder of the internal combustion engine, and a recovery operation of the intake / exhaust valve fixed to the stem of the intake / exhaust valve. An air spring chamber formed by an air piston to be performed, an air cylinder of the casing and an air cylinder of the casing and containing the working air of the air piston, and interposed between the intake and exhaust valve stem and the casing and from the air spring chamber A seal for preventing air leakage, an oil passage that is disposed in the casing and supplies lubricating oil onto the intake and exhaust valve stems in the vicinity of the seal, and a lubricating oil supplied from a hydraulic control mechanism is supplied to the oil passage. An oil supply device for an intake / exhaust valve stem of an internal combustion engine having an oil supply portion for opening the oil supply portion when the oil pressure of the lubricating oil supplied from the hydraulic control mechanism exceeds a predetermined pressure. To seal Supplying a check valve, an outer cylinder part, and an inner fitting part fitted inside the outer cylinder part with a minute gap, and supplying lubricating oil supplied from the check valve into the air spring chamber through the minute gap And a nozzle to be used.

  In the oil supply device for the intake / exhaust valve stem of the internal combustion engine according to the present invention, the oil supply portion includes a check valve and a nozzle having an outer cylinder portion and an inner fitting portion. Compared with the oil supply device of the exhaust valve stem, the configuration of the device is simplified and the number of parts can be greatly reduced.

  In particular, the number of swinging or moving parts is extremely reduced. A general-purpose valve can also be used as a check valve. Therefore, the occurrence of failure is small and the reliability is high, and the manufacturing and maintenance costs are extremely low.

  In the case of the internal combustion engine having the main valve and the subvalve described above, the lubricating oil supplied into the air spring chamber becomes mist-like in the air spring chamber due to the reciprocating operation of the air piston, etc. It adheres to the valve stem. As a result, a sufficient amount of lubricating oil is supplied to the seal interposed between the main valve stem and the auxiliary valve stem or between the intake and exhaust valve stem and the casing, and abnormal wear of the intake and exhaust valve stem is prevented. Well prevented.

  The hydraulic control mechanism that supplies lubricating oil to the oil supply unit is preferably a hydraulic control mechanism that operates a main valve or an intake / exhaust valve. Thereby, the hydraulic control mechanism that operates the main valve or the intake / exhaust valve and the hydraulic control mechanism that supplies the lubricating oil to the oil supply unit can be integrated, and the hydraulic control mechanism can be simplified.

It is desirable that the oil supply unit supplies lubricating oil into the air spring chamber when the main valve or the intake / exhaust valve is operated by the hydraulic control mechanism. This eliminates the need for new hydraulic control for supplying lubricating oil to the oil supply section. In addition, when the hydraulic control mechanism that supplies the lubricating oil to the oil supply unit is the hydraulic control mechanism that operates the main valve or the intake / exhaust valve, the hydraulic control mechanism is generated when the main valve or the intake / exhaust valve operates. High hydraulic pressure can be used as it is.

  The oil supply unit preferably includes a filter on the upstream side of the nozzle. The nozzle supplies lubricating oil into the air spring chamber through a minute gap between the outer cylinder portion and the inner fitting portion. It is necessary to provide a filter on the upstream side of the nozzle so as not to cause clogging due to foreign matter mixing in the minute gap. By providing this filter, clogging of the nozzle can be prevented in advance.

  It is desirable that the outer cylinder part has an inner shape formed in a cylinder shape, and the inner fitting part has an outer shape formed in a columnar shape. By making a combination of simple cross-sectional shapes, manufacture and adjustment of the gap width are facilitated.

  In the case of the internal combustion engine having the main valve and the subvalve described above, it is desirable to provide a safety valve for discharging the excess amount of lubricating oil accommodated in the air spring chamber to the outside. If excess lubricating oil is stagnant in the air spring chamber, there is a possibility of oil leakage or mixing into the supply air. By providing the safety valve, it is possible to prevent such a problem from occurring.

  An oil supply device for an intake / exhaust valve stem of an internal combustion engine according to the present invention operates according to an operation of a hydraulic control mechanism to intake and exhaust an engine cylinder of the internal combustion engine, and an intake / exhaust passage leading to the engine cylinder according to the operation of the main valve A secondary valve that is fixed to the stem of the main valve to restore the operation of the main valve, and a secondary valve that is fixed to the stem of the secondary valve and restores the switching operation of the secondary valve. An air spring chamber formed by a valve air piston, a main valve air piston, a subvalve air piston, and an air cylinder of a casing, and containing operating air of the main valve air piston and the subvalve air piston; a main valve stem and a subvalve An oil supply device for an intake / exhaust valve stem of an internal combustion engine having a seal interposed between the stem and the air spring chamber to prevent air leakage from the air spring chamber. An oil supply unit for forcibly supplying oil into the air spring chamber is further provided, and the oil supply unit opens to supply the lubricant to the seal when the oil pressure of the lubricant supplied from the hydraulic control mechanism exceeds a predetermined pressure. A nozzle that has a check valve, an inner cylinder portion, and an inner fitting portion that is fitted in the inner cylinder portion with a minute gap, and supplies lubricating oil supplied from the check valve into the air spring chamber through the minute gap. With.

  Alternatively, an oil supply device for an intake / exhaust valve stem of an internal combustion engine according to the present invention includes an intake / exhaust valve that operates by a hydraulic control mechanism to intake and exhaust an engine cylinder of the internal combustion engine, and an intake / exhaust that is fixed to the stem of the intake / exhaust valve. An air spring chamber, which is formed by an air piston for restoring the operation of the valve, an air piston and an air cylinder of the casing, and accommodates the working air of the air piston, and is interposed between the intake and exhaust valve stem and the casing A seal for preventing air leakage from the air spring chamber, an oil passage that is disposed in the casing and supplies lubricating oil onto the intake and exhaust valve stems in the vicinity of the seal, and lubrication supplied from the hydraulic control mechanism An oil supply device for an intake / exhaust valve stem of an internal combustion engine having an oil supply part for supplying oil to an oil passage, wherein the oil supply part is used when a hydraulic pressure of lubricating oil supplied from a hydraulic control mechanism exceeds a predetermined pressure. Open A check valve that supplies lubricating oil to the seal, and an outer cylinder part and an inner fitting part that is fitted inside the outer cylinder part with a minute gap, and the lubricating oil supplied from the check valve And a nozzle for supplying the air spring chamber through the gap.

  Therefore, the oil supply device for the intake / exhaust valve stem of the internal combustion engine according to the present invention has a simple configuration and a small number of parts. Therefore, the occurrence of failure is high and the reliability is high, and the manufacturing and maintenance costs are greatly reduced. There is an excellent effect of being able to.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out an oil supply device for an intake / exhaust valve stem of an internal combustion engine according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a simplified diagram showing the first embodiment, FIG. 2 is a front sectional view showing details of the fueling device, FIG. 3 is a front sectional view showing a check valve, and FIG. 4 is a front view showing a nozzle. Sectional drawing, FIG. 5 is a graph which shows operation | movement of a fueling apparatus, FIG. 6 is front sectional drawing which shows 2nd Embodiment.

  As a first embodiment, an oil supply device for an intake / exhaust valve stem of a medium speed diesel engine having a main valve and a sub valve as an example of an internal combustion engine will be described.

  As shown in FIG. 1, a main valve 11 that performs intake and exhaust of the engine cylinder 2 of the medium speed diesel engine 1 is provided. The main valve 11 is operated by the hydraulic control mechanism 10. A sub-valve 21 is provided that is operated by another hydraulic control mechanism 20 to switch the intake passage 3 and the exhaust passage 4 leading to the engine cylinder 2 according to the operation of the main valve 11.

  The sub valve 21 is operated by a hydraulic control mechanism 20 different from the main valve 11. The main valve 11 is opened by the main valve hydraulic cylinder 13 via the main valve stem 12, and the auxiliary valve 21 is switched between the intake and exhaust passages 3, 4 by the auxiliary valve hydraulic cylinder 23 via the auxiliary valve stem 22. Do.

  A main valve air piston 14 is fixed to the main valve stem 12. The main valve air piston 14 performs a recovery operation of the main valve 11. A sub valve air piston 24 is fixed to the stem 22 of the sub valve 21. The auxiliary valve air piston 24 performs a recovery operation of the auxiliary valve 21.

  One air spring chamber 26 is formed by the main valve air piston 14, the sub valve air piston 24, and the air cylinder 27 fixed to the casing. The air spring chamber 26 accommodates the operating air of the main valve air piston 14 and the sub valve air piston 24, and this operating air causes the recovery operation of the main valve 11 and the recovery operation of the sub valve 21.

  As shown in FIG. 2, a special seal ring (seal) 30 is interposed between the main valve stem 12 and the sub valve stem 22. The seal ring 30 is fixed to the auxiliary valve stem 22 by a retainer 31. For this reason, the seal surface of the seal ring 30 slides on the main valve stem 12 in response to the reciprocal relative movement of the main valve stem 12 and the sub valve stem 22. This seal ring 30 prevents air leakage from the air spring chamber 26.

  Lubricating oil of the engine 1 is supplied from the hydraulic control mechanism 10 of FIG. 1 to a lubricating oil inlet 32 disposed almost at the center of the casing 40. The lubricating oil supplied to the lubricating oil inlet 32 is supplied to the main valve hydraulic cylinder 13 through the oil passage 33 in the casing 40 to open the main valve 11.

The oil passage 33 branches in the middle, and a check valve (oil supply unit) 34 is disposed on the branch passage. As will be described later, the check valve 34 opens when the hydraulic pressure from the hydraulic control mechanism 10 of the main valve 11 exceeds a predetermined pressure P ₀ .

  An example of the check valve 34 is shown in FIG. The check valve 34 includes a body 45, a coil spring 47, a boblet 48 that is urged by the coil spring 47 and seats on the seat 46 of the body 45, and a retainer 48 that fixes the coil spring 47. Therefore, the sliding or moving parts are only the bobets 48, and the configuration is simple and the number of parts is small. For this reason, there are few failures and high reliability.

A nozzle (oil supply unit) 35 is attached to the casing 40. The nozzle 35 is for supplying lubricating oil into the air spring chamber 26, and as shown in FIG. It has an inner fitting part 37 whose outer shape is cylindrical. Thus, by making the cross-sectional shapes of the outer cylinder part 36 and the inner fitting part 37 simple, the manufacture and adjustment of the gap width are facilitated. However, the cross-sectional shapes of the outer cylinder part and the inner fitting part are not necessarily limited to a circular shape.

  A minute gap of about 2 μ is formed between the outer cylinder part 36 and the inner fitting part 37. A filter 38 is disposed on the upstream side of the nozzle 35. A safety valve 39 is disposed at the bottom of the air spring chamber 26 and is fixed to the casing 40.

  The operation of the oil supply device for the intake / exhaust valve stem of the medium speed diesel engine 1 will be described. In FIG. 2, the auxiliary valve 21 is in a position where the engine cylinder 2 and the exhaust passage 4 are communicated with each other by the working air in the air spring chamber 26.

As indicated by the solid line in FIG. 5, when the hydraulic control mechanism 10 of the main valve 11 generates a high pressure, the hydraulic pressure in the main valve hydraulic cylinder 13 rapidly increases. This high hydraulic pressure activates the main valve hydraulic cylinder 13 to open the main valve 11. While the main valve 11 is open, the hydraulic pressure is lower than the initial pressure, but changes at a substantially constant pressure exceeding the predetermined pressure P ₀ .

  Corresponding to the operation of the main valve 11, as shown by a two-dot chain line in FIG. 5, the sub valve 21 is operated by the hydraulic pressure from the hydraulic control mechanism 20 of the sub valve 21, and the engine cylinder 2, the intake passage 3, To communicate. As a result, the engine 1 supplies air to the engine cylinder 2.

On the other hand, the check valve 34 in FIG. 2 opens while the hydraulic pressure from the hydraulic control mechanism 10 of the main valve 11 exceeds the predetermined pressure P ₀ . As a result, high-pressure lubricating oil is supplied to the nozzle 35 through the filter 38 in FIG. The lubricating oil supplied to the nozzle 35 is dropped (supplied) into the air spring chamber 26 of FIG. 2 through a minute gap between the outer cylinder portion 36 and the inner fitting portion 37.

  The lubricating oil dropped into the air spring chamber 26 is atomized in the air spring chamber 26 by the reciprocating operation of the main valve air piston 14 and the sub valve air piston 24 and adheres onto the main valve stem 12. By the reciprocating operation of the main valve stem 12, the seal ring 30 interposed between the main valve stem 12 and the sub valve stem 22 is lubricated.

  The lubricating oil dropped into the air spring chamber 26 has a very small gap between the outer cylinder portion 36 and the inner fitting portion 37 of about 2 μm, so that the hydraulic pressure from the hydraulic control mechanism 10 of the main valve 11 becomes high. Nevertheless, it is extremely small. However, by forcibly supplying the lubricating oil into the air spring chamber 26 in this way, a sufficient amount of lubricating oil is supplied to the seal ring 30 as compared with the conventional case, and abnormal wear of the main valve stem 12 is well prevented. The

  The filter 38 shown in FIG. 4 filters foreign matters in the lubricating oil so that the minute gap between the outer cylinder portion 36 and the inner fitting portion 37 of the nozzle 35 is not clogged. The safety valve 39 discharges the excess amount of lubricating oil stored in the air spring chamber 26 to the outside. As a result, oil leakage from the air spring chamber 26 and contamination of the lubricating oil into the supply air can be prevented in advance.

As shown in FIG. 5, when the hydraulic pressure from the hydraulic control mechanism 10 of the main valve 11 becomes equal to or lower than a predetermined pressure P ₀ corresponding to the operation of the main valve 11, the check valve 34 in FIG. 2 is closed. Thereby, the supply of the lubricating oil from the nozzle 35 into the air spring chamber 26 is stopped.

  At the same time, the supply of hydraulic pressure from the hydraulic control mechanism 20 of the auxiliary valve 21 is cut off, and the auxiliary valve 21 returns to the position where the engine cylinder 2 and the exhaust passage 4 are communicated again by the operation of the auxiliary valve air piston 24.

As described above, the amount of lubricating oil supplied into the air spring chamber 26 by one opening operation of the main valve 11 is mainly the gap width between the outer cylinder portion 36 and the inner fitting portion 37 of the nozzle 35. However, it varies depending on the hydraulic pressure value supplied from the hydraulic control mechanism 10 of the main valve 11 and the setting method of the predetermined pressure P ₀ .

  According to the oil supply device for the intake / exhaust valve stem of the medium speed diesel engine 1 described above, the oil supply unit for forcibly supplying the lubricating oil supplied from the hydraulic control mechanism 10 of the main valve 11 into the air spring chamber 26 is provided. Since the oil supply portion includes the check valve 34 and the nozzle 35 having the outer cylinder portion 36 and the inner fitting portion 37, the configuration of the apparatus becomes extremely simple and the number of parts is small.

  In particular, the number of sliding or moving parts is extremely small. A general-purpose valve can also be used as a check valve. Therefore, the occurrence of failure is small and the reliability is high, and the manufacturing and maintenance costs are extremely low. Furthermore, since the hydraulic control mechanism for supplying the lubricating oil to the nozzle 35 is the hydraulic control mechanism 10 that operates the main valve 11, the apparatus is further simplified as compared with the case where a separate hydraulic control mechanism is provided. be able to.

  Further, since the lubricating oil is supplied to the nozzle 35 when the hydraulic control mechanism 10 of the main valve 11 is supplied, the extremely high hydraulic pressure for operating the main valve 11 can be used as it is, and the lubricating oil is supplied to the nozzle 35. This eliminates the need for new hydraulic control for the hydraulic control mechanism 10 for supplying the pressure. Thereby, simplification of the apparatus and reduction of the number of parts can be further promoted.

  As a second embodiment, an oil supply device for an intake / exhaust valve stem of a low-speed diesel engine that performs intake / exhaust by only an intake / exhaust valve as an example of an internal combustion engine will be described.

  The low-speed diesel engine 50 has an intake / exhaust valve (not shown) that is operated by a hydraulic control mechanism 51. In addition, an air piston 53 is provided to restore the above operation by the hydraulic control mechanism of the intake / exhaust valve, and the air piston 53 is fixed to the stem 52 of the intake / exhaust valve. Therefore, unlike the above-described medium-speed diesel engine 1, the low-speed diesel engine 50 does not correspond to the auxiliary valve 21, the auxiliary valve stem 22, the auxiliary valve hydraulic cylinder 23, and the auxiliary valve air piston 24 of FIG. .

  An air spring chamber 54 is formed by the air piston 53 and the air cylinder 56 of the casing 55 and accommodates the working air of the air piston 53. A special seal ring (seal) 57 is interposed between the intake / exhaust valve stem 52 and the stem support portion 58 fixed to the casings 55 and 65 to prevent air leakage from the air spring chamber 54. The seal ring 57 is attached to the stem support portion 58 by the retainer 66, that is, to the casings 55 and 65 side.

  An oil passage 64 is disposed across the inside of the casing 55. The oil passage 64 extends through the stem support 58 to the intake / exhaust valve stem 52 in the vicinity of the seal ring 57, and can supply lubricating oil onto the intake / exhaust valve stem 52.

A check valve (oil supply unit) 59 is disposed at the top. As will be described later, the check valve 59 opens when the hydraulic pressure from the hydraulic control mechanism 51 of the intake / exhaust valve exceeds a predetermined pressure P ₀ . A nozzle (oil supply unit) 60 is interposed between the check valve (oil supply unit) 59 and the oil passage 64.

Similarly to the nozzle 35 shown in FIG. 4 described above, the nozzle 60 includes an outer cylinder portion 61 whose inner shape is a cylinder, and an inner fitting portion 62 whose outer shape is fitted into the outer cylinder portion 61. A minute gap of about 2 μ is formed between the outer cylinder part 61 and the inner fitting part 62. A filter 63 is disposed on the upstream side of the nozzle 60.

  The operation of the oil supply device for the intake / exhaust valve stem of the low speed diesel engine 50 will be described focusing on the difference from the oil supply device for the intake / exhaust valve stem of the medium speed diesel engine 1 described above.

When the intake / exhaust valve hydraulic control mechanism 51 generates a high hydraulic pressure, the check valve 59 is opened only while the hydraulic pressure from the hydraulic control mechanism 51 exceeds the predetermined pressure P ₀ . Thereby, high-pressure lubricating oil is supplied to the nozzle 60 through the filter 63. The lubricating oil supplied to the nozzle 60 is supplied to the oil passage 64 after its flow rate is adjusted through a minute gap between the outer cylinder portion 61 and the inner fitting portion 62.

  Since the cross-sectional area of the oil passage 64 is formed larger than the cross-sectional area of the minute gap between the outer cylinder portion 61 and the inner fitting portion 62 of the nozzle 60, the lubricating oil that has passed through the nozzle 60 is on the downstream side. The flow rate is not further restricted by the oil passage 64.

  The lubricating oil pushed out from the oil passage 64 onto the intake / exhaust valve stem 52 in the vicinity of the seal 57 adheres to the surface of the intake / exhaust valve stem 52. The lubricating oil adhering to the surface of the intake / exhaust valve stem 52 lubricates between the seal ring 57 and the intake / exhaust valve stem 52 when the intake / exhaust valve stem 52 reciprocates.

  Thus, according to the oil supply device for the intake / exhaust valve stem of the low-speed diesel engine described above, the oil supply portion includes the check valve 59 and the nozzle 60 having the outer cylinder portion 61 and the inner fitting portion 62. Compared to a conventional oil supply device for an intake / exhaust valve stem of a low-speed diesel engine, the structure of the device is simple and the number of parts is small.

  In particular, the number of sliding or moving parts is extremely small. A general-purpose valve can also be used as a check valve. Therefore, the occurrence of failure is low and the reliability is high, and the manufacturing and maintenance costs can be greatly reduced. Others are the same as in the case of the oil supply device for the intake / exhaust valve stem of the medium-speed diesel engine 1 described above, and a description thereof will be omitted.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible, and it goes without saying that the present invention is not excluded from the scope of the present invention. For example, the internal combustion engine is not necessarily limited to the above-described medium speed diesel engine or low speed diesel engine, and can be implemented for various internal combustion engines. In addition, the hydraulic control mechanism for supplying hydraulic pressure to the oil supply device is not necessarily limited to the hydraulic control mechanism of the main valve or the intake / exhaust valve, and an independent or other hydraulic control mechanism can be used.

1 is a simplified diagram showing a first embodiment of an oil supply device for an intake / exhaust valve stem of an internal combustion engine according to the present invention. It is front sectional drawing which shows the detail of a fueling apparatus. It is front sectional drawing which shows a non-return valve. It is front sectional drawing which shows a nozzle. It is a graph which shows operation | movement of a fueling apparatus. It is front sectional drawing which shows 2nd Embodiment. It is front sectional drawing which shows the oil supply apparatus of the intake / exhaust valve stem of the conventional internal combustion engine. It is sectional drawing which shows the control part of FIG. It is sectional drawing which shows the control part seen from arrow AA of FIG.

Explanation of symbols

1 Medium-speed diesel engine (internal combustion engine)
2 Engine cylinder 3 Intake passage 4 Exhaust passage 10 Hydraulic control mechanism 11 Main valve 12 Main valve stem 13 Main valve hydraulic cylinder 14 Main valve air piston 20 Hydraulic control mechanism 21 Sub valve 22 Sub valve stem 23 Sub valve hydraulic cylinder 24 Sub valve air Piston 26 Air spring chamber 27 Air cylinder 30 Seal ring (seal)
31 Retainer 32 Lubricating oil inlet 33 Internal oil passage 34 Check valve (oil supply section)
35 Nozzle (oil supply part)
36 outer cylinder part 37 inner fitting part 38 filter 39 safety valve 40 casing 50 low speed diesel engine (internal combustion engine)
51 Hydraulic Control Mechanism 52 Intake / Exhaust Valve Stem 53 Air Piston 54 Air Spring Chamber 55 Casing 56 Air Cylinder 57 Seal Ring (Seal)
58 Stem support part 59 Check valve (oil supply part)
60 nozzles (oil supply part)
61 Outer cylinder part 62 Inner fitting part 63 Filter 64 Oil path 65 Casing 66 Retainer 101 Hydraulic cylinder 102 Valve stem 103 Air piston 104 Air spring chamber 105 Casing 106 Stem support part 107 Seal ring 110 Control valve 111 Oil supply piston 112 Spring 113 Switching part 114 Groove 115 Extrusion cylinder 116 Spring P ₀ Predetermined pressure

Claims (9)

A main valve (11) that operates by a hydraulic control mechanism (10) to intake and exhaust the engine cylinder (2) of the internal combustion engine (1), and an intake and exhaust passage (3, 4) that communicates with the engine cylinder are connected to the main valve. A sub-valve (21) that switches according to the operation of the main valve, a main valve air piston (14) that is fixed to the stem (12) of the main valve and that restores the operation of the main valve, A sub-valve air piston (24) fixed to the stem (22) to restore the switching operation of the sub-valve; a main valve air piston; the sub-valve air piston; and an air cylinder of the casing (40) ( 27) and is interposed between the main valve stem and the sub-valve stem, and is interposed between the air spring chamber (26) for accommodating the working air of the main valve air piston and the sub-valve air piston. Sky from air spring chamber An oil supply device for an intake / exhaust valve stem of an internal combustion engine provided with a seal (30) for preventing leakage further includes an oil supply part for forcibly supplying lubricating oil supplied from a hydraulic control mechanism into the air spring chamber. And a check valve (34) that opens when the oil pressure of the lubricating oil supplied from the hydraulic control mechanism exceeds a predetermined pressure (P ₀ ) and supplies the lubricating oil to the seal. ), And an inner fitting part (37) that is fitted in the outer cylinder part with a minute gap provided therein, and the lubricating oil supplied from the check valve is passed through the minute gap through the minute gap. An oil supply device for an intake / exhaust valve stem of an internal combustion engine, comprising a nozzle (35) for supplying the air spring chamber. 2. The intake and exhaust of the internal combustion engine according to claim 1, wherein the hydraulic control mechanism that supplies the lubricating oil to the oil supply unit is the hydraulic control mechanism (10) that operates the main valve (11). Valve stem oiling device. The internal combustion engine according to claim 1 or 2, wherein the oil supply section supplies the lubricating oil into the air spring chamber (26) during the operation of the main valve by the hydraulic control mechanism (10). Inlet / exhaust valve stem oiling device. An intake / exhaust valve that operates by a hydraulic control mechanism (51) to intake and exhaust the engine cylinder of the internal combustion engine (50), and a recovery of the operation of the intake / exhaust valve fixed to the stem (52) of the intake / exhaust valve An air spring chamber (54) formed by an air piston (53) for performing an operation, an air cylinder (56) of the air piston and a casing (55), and containing the working air of the air piston; A seal (57) interposed between the valve stem and the casing to prevent air leakage from the air spring chamber, and an intake / exhaust valve stem disposed in the casing and in the vicinity of the seal An oil supply device for an intake / exhaust valve stem of an internal combustion engine, comprising: an oil passage (64) for supplying lubricating oil to the oil passage; and an oil supply portion for supplying the oil supplied from a hydraulic control mechanism to the oil passage. Oil portion includes a check valve (59) for supplying the lubricating oil to the valve opening when the hydraulic pressure of the lubricating oil supplied from the hydraulic control mechanism exceeds a predetermined pressure (P ₀₎ to the seal, It has an outer cylinder part (61) and an inner fitting part (62) fitted in the outer cylinder part by providing a minute gap, and the lubricating oil supplied from the check valve is passed through the minute gap to the oil passage. An oil supply device for an intake / exhaust valve stem of an internal combustion engine, comprising a nozzle (60) for supply. 5. The intake / exhaust valve stem of the internal combustion engine according to claim 4, wherein the hydraulic control mechanism that supplies the lubricating oil to the oil supply unit is the hydraulic control mechanism (51) that operates the intake and exhaust. Refueling device. The internal combustion engine according to claim 4 or 5, wherein the oil supply section supplies the lubricating oil into the air spring chamber (54) during the operation of the intake / exhaust valve by the hydraulic control mechanism (51). Oil supply device for intake and exhaust valve stem of engine. The oil supply portion of the intake and exhaust valve stem of the internal combustion engine according to any one of claims 1 to 6, wherein the oil supply portion includes a filter (38, 63) upstream of the nozzle (35, 60). apparatus. The outer cylinder portion (36, 61) has an inner shape formed in a cylindrical shape, and the inner fitting portion (37, 62) has an outer shape formed in a cylindrical shape. An oil supply device for an intake / exhaust valve stem of an internal combustion engine according to any one of the above. The safety valve (39) for discharging the surplus amount of the lubricating oil accommodated in the air spring chamber (26) to the outside is provided. An oil supply device for an intake / exhaust valve stem of an internal combustion engine according to any one of the above.