JP5790484B2 - Oil jet - Google Patents

Description

  The present invention relates to an oil jet, and more particularly to an oil jet that cools a piston by injecting oil.

  Conventionally, for example, Patent Document 1 discloses an oil jet including a hollow portion into which oil flows from an oil flow path of an internal combustion engine, and a nozzle that injects cooling oil toward a piston through communication with the hollow portion. An oil jet is disclosed in which a hollow first opening / closing valve mechanism that opens and closes by oil pressure and a temperature-sensitive opening / closing second valve mechanism that opens and closes by oil temperature are provided. In this oil jet, the second valve mechanism is provided upstream of the first valve mechanism in the oil flow direction (that is, the hollow portion on the oil flow path side). Further, a shape memory alloy spring having a property of contracting at a low temperature is used for the second valve mechanism. When the shape memory alloy spring contracts, the second valve mechanism is actuated to block the oil flow in the hollow portion. Therefore, according to the oil jet, oil injection to the piston can be prohibited when the oil temperature is low. Therefore, for example, it is possible to prevent the piston from being overcooled by the low temperature oil immediately after the engine is started.

JP 2011-012650 A

  However, the above-mentioned oil jet has a disadvantage that oil injection cannot be performed unless the oil temperature rises to a high temperature due to the nature of the shape memory alloy spring. That is, even if the oil pressure is high, if the oil temperature is low, oil injection is prohibited. Here, the temperature increase rate of the piston does not completely coincide with the oil temperature increase rate. Therefore, if the oil injection is prohibited because the oil temperature is low even though the temperature of the piston is high, problems such as piston seizure and melting damage may occur.

  The present invention has been made in view of the above-described problems. That is, an object of the present invention is to provide an oil jet capable of accurately injecting oil corresponding to the temperature rise of the piston.

In order to achieve the above object, a first invention is an oil jet,
A main body having a hollow portion into which oil flows from an oil flow path of the internal combustion engine;
A nozzle that injects oil toward the piston by communication with the hollow portion;
A first shut-off means provided in the hollow portion and closed when the oil pressure is equal to or lower than a first set pressure, and shuts off the communication between the oil flow path and the nozzle;
Provided in the hollow portion, first to block the communication between the nozzle and the oil flow path is closed when the oil temperature is the preset temperature or less or oil pressure under the second set pressure of the lower pressure than the first set pressure 2 blocking means;
Equipped with a,
The first breaking means and the second blocking means is characterized that you have been placed in parallel with the oil passage.

The second invention is the first invention, wherein
Said second blocking means includes an oil temperature-closing means for opening when the oil temperature is equal to or higher than the set temperature, provided on the downstream side of the oil flow direction than the oil temperature closure means, said second set oil pressure And a hydraulic opening / closing means that opens when the pressure exceeds the pressure.

The third invention is the first or second invention, wherein
The set temperature is the oil temperature region of the temperature in the vicinity of 50 ° C., the second set pressure is characterized in that it is a pressure within 150kPa near the oil pressure range.

  According to the present invention, the communication between the oil passage and the nozzle of the internal combustion engine can be blocked by the first blocking means and the second blocking means. The first shut-off means is closed when the oil pressure is lower than the first set pressure, and the second shut-off means is closed when the oil temperature is lower than the set temperature or the oil pressure is lower than the second set pressure. . Therefore, when the oil pressure is equal to or higher than the first set pressure, or when the oil temperature is equal to or higher than the set temperature and the oil pressure is equal to or higher than the second set pressure, the oil is injected into the piston. Here, since the second set pressure is lower than the first set pressure, the second set pressure and the set temperature are appropriately set while setting the first set pressure as the pressure corresponding to the conventional oil injection pressure. By doing so, it is possible to inject oil that accurately corresponds to the temperature of the piston. Therefore, piston reliability can be improved.

It is a mimetic diagram for explaining the composition of an internal-combustion engine provided with oil jet 10 of an embodiment. 1 is a schematic cross-sectional view of an oil jet 10. FIG. It is a figure for demonstrating operation | movement of the oil jet 10 in a medium oil temperature and a medium hydraulic pressure area | region. It is a figure for demonstrating operation | movement of the oil jet 10 in a low oil temperature and a high hydraulic pressure area | region. It is a figure for demonstrating operation | movement of the oil jet 10 in a medium oil temperature and a high hydraulic pressure area | region. It is a figure for demonstrating operation | movement of the oil jet 10 in a middle oil temperature and a low hydraulic pressure area | region. It is a figure for demonstrating the injection characteristic by the oil jet 10 of this embodiment.

[Structure of oil jet]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 1 is a schematic diagram for explaining a configuration of an internal combustion engine including an oil jet 10 according to an embodiment of the present invention. As shown in FIG. 1, the internal combustion engine 12 includes a cylinder block 16 having a piston 14 therein. An oil passage 18 through which oil discharged from an oil pump (not shown) flows is formed near the lower end of the cylinder block 16. In the present embodiment, as the oil pump, a mechanical oil pump that is driven at the engine speed and has predetermined discharge pressure / flow rate characteristics is used.

  The oil jet 10 is attached at a position where it can be injected toward the inner surface of the piston 14 in the oil passage 18. FIG. 2 is a schematic cross-sectional view of the oil jet 10. The oil jet 10 includes an oil jet main body 20 and an oil nozzle 22 attached to the oil jet main body 20 by brazing or the like. The oil jet main body 20 is formed with an opening 24 that opens to the oil passage 18 side and internal flow paths 26 and 28 that communicate with the opening 24. The internal flow paths 26 and 28 are independent flow paths, and communicate with an oil injection path 30 that is an internal flow path of the oil nozzle 22.

  The internal flow path 26 is provided with a pressure system pressure valve 32 that opens and closes the internal flow path 26 by moving up and down. The pressure system pressure valve 32 is urged in a direction to close the internal flow path 26 by an elastic member 34 (for example, a coil spring). However, when the oil pressure on the upstream side of the pressure system pressure valve 32 rises to a first set pressure (for example, 250 kPa) or more, a force exceeding the urging force by the elastic member 34 is applied, so the pressure system pressure valve 32 moves downward. . When the pressure system pressure valve 32 moves downward, the internal flow path 26 opens. If the internal flow path 26 is opened, the oil injection passage 30 and the opening 24 communicate with each other via the internal flow path 26. Below the elastic member 34, an adapter 36 that is fixed by press-fitting or the like that supports the pressure system pressure valve 32 and the elastic member 34 is provided.

  Like the internal flow path 26, the internal flow path 28 is provided with an oil temperature system pressure valve 38 that opens and closes the internal flow path 28 by moving up and down, and an elastic member 40 (for example, a coil spring). Above the oil temperature system pressure valve 38, an adapter 42 that is fixed by press-fitting or the like that supports the oil temperature system pressure valve 38 and the elastic member 40 is provided. The oil temperature system pressure valve 38 is urged in a direction to close the internal flow path 28 by an elastic member 40 (for example, a coil spring). However, when the oil pressure upstream of the oil temperature system pressure valve 38 rises to a second set pressure (for example, 150 kPa) or more, a force exceeding the urging force of the elastic member 40 is applied, so the oil temperature system pressure valve 38 is lowered downward. Moving.

  Further, a temperature-sensitive deformation member 44 (for example, a shape memory alloy or bimetal) is provided above the adapter 42. The temperature-sensitive deformation member 44 is provided so as to close the oil inlet 28 a of the internal flow path 28. However, when the temperature of the oil flowing through the oil passage 18 rises to a set temperature (for example, 50 ° C.) or higher, the temperature-sensitive deformation member 44 is deformed, so that the closed state of the oil inlet 28a is released. When the closed state of the oil inlet 28a is released, the opening 24 and the internal flow path 28 communicate with each other. In this case, when the oil temperature system pressure valve 38 further moves downward, the oil injection passage 30 and the opening 24 communicate with each other via the internal flow path 28.

[Operation of oil jet]
Next, the operation of the oil jet 10 will be described with reference to FIGS. 3 to 6 while corresponding to the oil temperature (hereinafter also referred to as “oil temperature”) and the oil pressure (hereinafter also referred to as “hydraulic pressure”). . In the following description, the low oil temperature region and the medium oil temperature region represent two temperature regions having the set temperature as a boundary, and the high oil pressure region, the medium oil pressure region, and the low oil pressure region are the first setting. It is assumed that three temperature regions having a boundary between the pressure and the second set pressure are represented.

  FIG. 3 is a diagram for explaining the operation of the oil jet 10 in the middle oil temperature and middle oil pressure regions. As shown in FIG. 3, in the middle oil temperature range, the temperature sensitive deformation member 44 is deformed and the closed state of the oil inlet 28a is released. In the middle hydraulic pressure range, the pressure system pressure valve 32 is maintained in the biased state, but the oil temperature system pressure valve 38 moves downward. Therefore, as indicated by arrows in FIG. 3, the oil flowing through the oil passage 18 flows into the oil injection passage 30 via the opening 24 and the internal flow path 28. The inflowing oil is injected from the oil nozzle 22 toward the inner surface of the piston 14.

  FIG. 4 is a diagram for explaining the operation of the oil jet 10 in a low oil temperature and high oil pressure region. In the low oil temperature range, the temperature-sensitive deformation member 44 closes the oil inlet 28a, so that oil does not flow into the internal flow path 28. On the other hand, in the high hydraulic pressure region, the pressure system pressure valve 32 moves downward. Therefore, as indicated by arrows in FIG. 4, the oil flowing through the oil passage 18 flows into the oil injection passage 30 via the opening 24 and the internal flow path 26. The inflowing oil is injected from the oil nozzle 22 toward the inner surface of the piston 14.

  FIG. 5 is a diagram for explaining the operation of the oil jet 10 in the medium oil temperature and high hydraulic pressure regions. As shown in FIG. 5, in the middle oil temperature range, the temperature-sensitive deformation member 44 is deformed and the closed state of the oil inlet 28a is released. In the high hydraulic pressure region, both the pressure system pressure valves 32 and 38 move downward. Therefore, as indicated by arrows in FIG. 5, the oil flowing through the oil passage 18 flows into the oil injection passage 30 from the opening 24 via the internal flow paths 26 and 28. The inflowing oil is injected from the oil nozzle 22 toward the inner surface of the piston 14.

  FIG. 6 is a view for explaining the operation of the oil jet 10 in the medium oil temperature and low oil pressure regions. As shown in FIG. 6, in the middle oil temperature range, the temperature-sensitive deformation member 44 is deformed and the closed state of the oil inlet 28a is released, but since the oil pressure range is low, the oil temperature system pressure valve 38 is energized. State is maintained. Therefore, the oil flowing through the oil passage 18 can flow from the opening 24 to the intermediate point of the internal flow path 28, but does not flow into the oil injection passage 30 because the oil temperature system pressure valve 38 is closed. Further, since the pressure is in the low hydraulic pressure range, the urging state of the pressure system pressure valve 32 is also maintained. Therefore, oil injection is not performed.

  The operation of the oil jet 10 in the high oil temperature and high hydraulic pressure region is the same as the operation in the medium oil temperature and high hydraulic pressure region described with reference to FIG. That is, the oil flowing through the oil passage 18 flows into the oil injection passage 30 from the opening 24 via the internal flow paths 26 and 28 and is injected from the oil nozzle 22. Further, in the low oil temperature and low oil pressure regions, the temperature sensitive deformation member 44 closes the oil inlet 28a and the urging state of the pressure system pressure valve 32 is maintained, so that oil injection is not performed.

  Next, the injection characteristics of the oil jet 10 according to this embodiment will be described with reference to FIG. FIG. 7 (A) shows the oil jettable region of the oil jet 10 of the present embodiment, and FIG. 7 (B) shows the oil jettable region of the oil jet of Patent Document 1 as a comparison. It is a thing. As can be seen from this figure, according to the oil jet 10 of the present embodiment, it is possible to inject oil into the piston 14 not only in a high oil pressure and large oil flow rate region but also in a medium oil pressure and medium oil flow rate region. Further, as shown in FIG. 7A, if the temperature-sensitive deformation member 44 is deformed when the oil pressure reaches the second set pressure, oil injection (oil temperature in a higher oil pressure region than the second set pressure). System injection), oil injection (pressure system injection) in an oil pressure region higher than the first set pressure, and oil injection (oil temperature system injection + pressure system injection) in combination of both.

  If the above-described three types of oil injection are possible, the oil injection can be performed before the piston 14 is heated, as well as when the piston 14 is heated. That is, in the intermediate oil temperature and intermediate oil pressure regions, it is assumed that the throttle is greatly opened by the high gear in the warm-up process, and the temperature of the piston 14 is rising or high. In this regard, according to the oil jet 10 of the present embodiment, since the oil is injected in the region, it can be cooled before the piston 14 is heated or at a high temperature.

  In addition, oil injection is possible even under operating conditions in which the temperature of the piston 14 increases rapidly. The temperature of the piston 14 is correlated with the number of explosions of the internal combustion engine 12 (that is, the engine speed) and the throttle opening. If the number of explosions is large or the throttle opening is large, the temperature of the piston 14 increases. For this reason, for example, during rapid acceleration after starting the engine or traveling on a high load uphill, the piston 14 may become hot even though the oil temperature is low. In this regard, according to the oil jet 10 of the present embodiment, since the oil is injected also in the region, the piston 14 can be cooled.

  Further, for example, in the case of a constant speed and light load traveling up to about 30 km / h, that is, in a low oil temperature and low hydraulic pressure region such as a medium oil temperature and low hydraulic pressure region or idling, no oil is injected. Therefore, overcooling of the piston 14 due to oil injection can be prevented in an area where the piston 14 is not required to be cooled.

  Thus, according to the oil jet 10 of the present embodiment, oil injection that accurately corresponds to the temperature of the piston 14 can be performed. Therefore, piston reliability can be improved.

  In the above embodiment, the first set pressure is 250 kPa, the second set pressure is 150 kPa, and the set temperature is 50 ° C., but these are eigenvalues adapted to the operating state of the internal combustion engine. The numerical value itself is not limited. In other words, in the present invention, the elastic members 34 and 40 and the temperature-sensitive deformation member 44 can be appropriately selected to set values close to these set values.

In the above embodiment, the opening 24 and the internal channels 26 and 28 are the “hollow portion” in the first invention, and the pressure system pressure valve 32, the elastic member 34, and the adapter 36 are in the first invention. The oil temperature system pressure valve 38, the elastic member 40, the adapter 42, and the temperature-sensitive deformation member 44 correspond to the “first blocking means” and the “second blocking means” in the first invention, respectively.
Further, in the above embodiment, the temperature sensitive deformation member 44 is the “oil temperature type opening / closing means” in the second invention, and the oil temperature system pressure valve 38 and the elastic member 40 are the “hydraulic type opening / closing means in the second invention. It corresponds to “means”.

DESCRIPTION OF SYMBOLS 10 Oil jet 12 Internal combustion engine 18 Oil passage 20 Oil jet main body 22 Oil nozzle 24 Opening part 26,28 Internal flow path 28a Oil inflow port 32 Pressure system pressure valve 34,40 Elastic member 36,42 Adapter 38 Oil temperature system pressure valve 44 Temperature-sensitive deformation member

Claims (3)

A main body having a hollow portion into which oil flows from an oil flow path of the internal combustion engine;
A nozzle that injects oil toward the piston by communication with the hollow portion;
A first shut-off means provided in the hollow portion and closed when the oil pressure is equal to or lower than a first set pressure, and shuts off the communication between the oil flow path and the nozzle;
Provided in the hollow portion, first to block the communication between the nozzle and the oil flow path is closed when the oil temperature is the preset temperature or less or oil pressure under the second set pressure of the lower pressure than the first set pressure 2 blocking means;
Equipped with a,
The first breaking means and said second shut-off means, the oil jet which is characterized that you have been placed in parallel with the oil passage. Said second blocking means includes an oil temperature-closing means for opening when the oil temperature is equal to or higher than the set temperature, provided on the downstream side of the oil flow direction than the oil temperature closure means, said second set oil pressure The oil jet according to claim 1, further comprising a hydraulic opening / closing means that opens when the pressure exceeds the pressure. The set temperature is the oil temperature region of the temperature in the vicinity of 50 ° C., an oil jet according to claim 1 or 2, wherein the second set pressure is characterized in that it is a pressure within 150kPa near the oil pressure range.

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