JP4539611B2 - Oil passage structure of internal combustion engine - Google Patents

Description

  The present invention relates to an oil passage structure of an internal combustion engine that supplies oil to an oil pressure operating device attached to the internal combustion engine through an oil supply passage formed inside the internal combustion engine.

  In order to automatically adjust the tension of the timing chain of an internal combustion engine, it is often used to provide a tensioner that is operated by oil. The tensioner is supplied with oil discharged from an oil pump through an oil supply passage formed inside an internal combustion engine (specifically, a cylinder head or a cylinder block). When the timing chain is loosened, the plunger provided inside the cylinder of the tensioner protrudes by the urging force of the spring, and the timing chain is pressed. Also, with the movement of the plunger, the check valve is opened and oil flows into the cylinder. On the other hand, when the plunger is pressed by the timing chain and a force is applied in a direction that causes the plunger to be immersed in the cylinder, the check valve is closed and the outflow of oil from the cylinder is restricted. The tension of the timing chain is adjusted to be constant by the operation of the tensioner.

  By the way, when the internal combustion engine is started, since the rotational fluctuation of the engine output shaft is large, the fluctuation amount of the tension of the timing chain tends to be large. When the tension of the timing chain is reduced, the plunger protrudes, the check valve is opened, and the oil in the oil supply path is sucked into the cylinder.

  Here, the oil inside the cylinder leaks from between the cylinder and the plunger. Therefore, when the operation of the internal combustion engine is stopped and the oil supply to each part of the engine by the oil pump is stopped, the oil pressure inside the cylinder is reduced. Further, when the operation of the internal combustion engine is stopped, the oil in the oil supply path flows down by its own weight. Therefore, when the internal combustion engine is restarted, there is a risk that the amount of oil supplied to the tensioner will be insufficient during the period until the oil discharged from the oil pump reaches the tensioner through the oil supply path. If air is mixed into the tensioner due to the shortage, the tensioner will not perform its original function, and the tension of the timing chain cannot be adjusted properly. As a result, the vibration width of the timing chain increases. Noise will be generated.

  Thus, it has been proposed to provide an oil storage chamber in a portion of the internal combustion engine where the tensioner is attached. The oil storage chamber is formed by forming a recess in the internal combustion engine through which an oil supply path is communicated and attaching a tensioner so as to close the recess. Since the oil is stored in the oil storage chamber without flowing down even when the internal combustion engine is stopped, the oil in the oil storage chamber is sucked into the cylinder of the tensioner when the internal combustion engine is restarted. Thus, a decrease in the performance of the tensioner is suppressed.

  Even if the oil storage chamber is provided in this way, air is sucked into the tensioner when the oil level in the oil storage chamber decreases to the oil suction port of the tensioner when the internal combustion engine is restarted. Since the main parts (cylinder block and cylinder head) of the internal combustion engine are formed by die casting or other mold forming, the shape of the oil supply path and oil storage chamber is complicated for the convenience of the internal combustion engine. It cannot be made into a perfect shape. For this reason, the degree of freedom in setting the oil inlet passage formed in the oil supply passage in the oil storage chamber and the tensioner is low. Therefore, the volume of the oil storage chamber must be increased in order to reliably suppress the intake of air into the tensioner when the internal combustion engine is restarted regardless of the positions where the communication port and the oil suction port are formed.

  For such inconvenience, for example, as in the oil passage structure described in Patent Document 1, a partition wall is formed inside the oil storage chamber, and the upper portion in the vertical direction is between the communication port and the oil suction port. It is proposed that the communication port and the oil suction port communicate with each other in the lower portion.

In this structure, even if the oil level on the oil supply path side decreases when the internal combustion engine is restarted, the oil level on the tensioner side from the partition wall is not reduced unless the oil level decreases to the lower end of the partition wall. It will not drop. For this reason, it is possible to suppress the intrusion of air into the tensioner and, consequently, the performance degradation of the tensioner by the oil storage chamber having a relatively small capacity.
Japanese Patent No. 3141740

  In the above-described internal combustion engine, in order to prevent oil shortage at the time of restart, the formation position of the communication port of the oil supply path and the formation position of the oil suction port of the tensioner are taken into consideration. It is necessary to set the shape and the extended shape of the partition wall. For this reason, the oil storage chamber tends to have a complicated structure, and the molding thereof tends to be difficult. In addition, when the oil storage chamber has a complicated structure, it is difficult to reduce the volume of the oil storage chamber for the convenience of molding, and this is preferable because it contributes to limiting the space saving of the oil storage chamber. Absent.

  Such a situation is not limited to the tensioner described above, but in an oil passage structure of an oil pressure operating device that is operated by oil supplied through an oil supply passage and an oil storage chamber formed in the internal combustion engine, such as a lash adjuster. Are generally common.

  The present invention has been made in view of such circumstances, and an object of the present invention is to reduce the performance of the oil pressure operating device at the time of restarting the internal combustion engine while appropriately suppressing the shape of the oil storage chamber. Is to provide an oil passage structure of an internal combustion engine that can be set with a high degree of freedom.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to a first aspect of the present invention, oil is supplied to an oil pressure operating device attached to the internal combustion engine through an oil supply path formed inside the internal combustion engine, and communicated with the oil supply path. In an oil passage structure of an internal combustion engine provided with an oil storage chamber defined by the internal combustion engine and the oil pressure operating device, a hollow intermediate member is interposed between the internal combustion engine and the oil pressure operating device, Through holes are respectively formed in the wall portion on the oil pressure operating device side and the wall portion on the oil supply path side in the hollow portion of the intermediate member, and the oil storage chamber and the oil pressure operating device are connected through the through holes. The through hole of the wall portion on the oil supply path side is formed at a position above the through hole of the wall portion on the oil pressure operating device side in the vertical direction. And effect.

  According to the above configuration, since the through hole in the wall portion on the oil supply path side in the hollow portion of the intermediate member is formed at a position above the through hole in the wall portion on the oil pressure operating device side in the vertical direction, the internal combustion engine is stopped. Sometimes oil can be stored inside the hollow part. Therefore, when the internal combustion engine is restarted, the oil stored in the hollow portion is drawn into the oil pressure operating device. In addition, the amount of oil that can be drawn into the oil pressure operating device from the hollow portion when the internal combustion engine is restarted can be determined through the setting of the formation positions of the through holes and the shape of the hollow portion in the intermediate member. Therefore, if it is possible to attach an intermediate member formed in a shape that does not cause shortage of oil when the internal combustion engine is restarted, the shape (volume) of the oil storage chamber and the communication port of the oil supply path in the oil storage chamber The formation position can be freely set, and the degree of freedom in setting the shape and the formation position can be remarkably increased. Therefore, the shape of the oil storage chamber can be set with a high degree of freedom while it is possible to appropriately suppress the performance degradation of the oil pressure operating device when the internal combustion engine is restarted.

The gist of the invention according to claim 2 is that, in the oil passage structure of the internal combustion engine according to claim 1, the intermediate member is formed in a shape in which two plates are combined.
According to the said structure, the intermediate member of a hollow structure can be formed easily.

  According to a third aspect of the present invention, in the oil passage structure of the internal combustion engine according to the first or second aspect, the volume of the hollow portion of the intermediate member is larger than the volume of the portion of the oil reservoir chamber excluding the intermediate member. The gist is that it is set large.

  According to the above configuration, the space other than the hollow portion in the oil storage chamber can be reduced, and the oil storage chamber having a small capacity can suppress a decrease in performance of the oil pressure operating device when the internal combustion engine is restarted.

  According to a fourth aspect of the present invention, oil is supplied to an oil pressure operating device attached to the internal combustion engine through an oil supply path formed inside the internal combustion engine, and communicated with the oil supply path. In an oil passage structure of an internal combustion engine provided with an oil storage chamber defined by the internal combustion engine and the oil pressure operating device, an intermediate member is interposed between the internal combustion engine and the oil pressure operating device. The gist of the invention is that a through-hole that communicates the oil storage chamber and the oil pressure operating device is formed at a position below the communication port of the oil supply passage in the oil storage chamber in the vertical direction.

  According to the above configuration, the oil that is sucked from the oil reservoir into the hydraulic operating device through the setting of the formation position of the through hole in the intermediate member, regardless of the position of the oil suction port formed in the oil pressure operating device. The vertical position of the suction port can be set. Therefore, the degree of freedom for setting the position of the oil suction port can be remarkably increased as compared with a structure in which no intermediate member is provided. In addition, when setting the shape of the oil storage chamber and the formation position of the communication port of the oil supply path in the oil storage chamber so as not to cause a shortage of oil when the internal combustion engine is restarted, the setting of the shape and the formation position The degree of freedom about can be greatly increased. Therefore, the shape of the oil storage chamber can be set with a high degree of freedom while it is possible to appropriately suppress the performance degradation of the oil pressure operating device when the internal combustion engine is restarted.

  According to a fifth aspect of the present invention, in the oil passage structure of the internal combustion engine according to any one of the first to fourth aspects, an insertion hole is formed in each of the oil pressure operating device and the intermediate member, and the internal combustion engine. Screw holes are formed in the engine, screws are screwed into the screw holes through the insertion holes, the oil pressure operating device is attached to the internal combustion engine together with the intermediate member, and a burring is formed in the insertion hole of the intermediate member The gist is to be done.

  According to the above configuration, when the oil pressure operating device and the intermediate member are attached to the internal combustion engine, the intermediate member can be positioned, and hence the oil pressure operating device and the intermediate member 40 can be easily positioned with respect to the internal combustion engine. The workability concerning the attachment can be improved.

  The invention according to claim 6 is the oil passage structure of the internal combustion engine according to any one of claims 1 to 5, wherein the intermediate member is oil from between the internal combustion engine and the oil pressure operating device. Its gist is to have a function as a sealing material for sealing leakage.

  According to the above configuration, oil can be prevented from leaking from the oil storage chamber when the internal combustion engine is stopped, and the oil sucked into the oil pressure operating device can be suitably ensured when the internal combustion engine is restarted. Can do.

  According to a seventh aspect of the present invention, in the oil passage structure of the internal combustion engine according to any one of the first to sixth aspects, the internal combustion engine transmits power from a crankshaft to a camshaft via a winding transmission member. The gist is that the oil pressure operating device is a tensioner that adjusts the tension of the winding transmission member.

  According to the above configuration, it is possible to appropriately suppress the performance degradation of the tensioner when the internal combustion engine is restarted, and it is possible to suitably suppress the generation of vibration and noise of the winding transmission member such as the timing chain and the timing belt. .

(First embodiment)
Hereinafter, a first embodiment in which an oil passage structure of an internal combustion engine according to the present invention is embodied will be described.

Here, first, a schematic configuration of an internal combustion engine to which the oil passage structure according to the present embodiment is applied will be described with reference to FIG.
As shown in FIG. 1, a V-type engine is adopted as the internal combustion engine 10 according to the present embodiment. Each bank of the internal combustion engine 10 is provided with an intake camshaft 11 and an exhaust camshaft 12. The internal combustion engine 10 is provided with a timing chain 13 corresponding to each bank, and the timing chain 13 is wound around the intake camshaft 11, the exhaust camshaft 12, and the crankshaft 14, respectively. In the internal combustion engine 10, the power of the crankshaft 14 is transmitted via the timing chain 13, whereby the intake camshaft 11 and the exhaust camshaft 12 are rotationally driven. In the present embodiment, each timing chain 13 functions as a winding transmission member.

  In the vicinity of each timing chain 13, a tensioner device 15 is provided for adjusting the tension applied to the timing chain 13 to be constant. The tensioner device 15 includes a tension lever 16 and a tensioner 20.

  The tension lever 16 is formed in a bow shape, and is provided along the outer periphery of the timing chain 13 at a position between the crankshaft 14 and the camshafts 11 and 12. Note that one end (support portion 16a) of the tension lever 16 is supported by the cylinder block 10a, and swings in a direction approaching the timing chain 13 or a direction away from the timing chain 13 with the support portion 16a as a fulcrum. It is arranged to be possible.

  The tensioner 20 is provided so as to abut against the tension lever 16 and press the tension lever 16 together with the timing chain 13 in the inner circumferential direction of the timing chain 13. In the present embodiment, the tensioner 20 functions as an oil pressure operating device.

Next, a specific structure of the tensioner 20 will be described with reference to FIG.
As shown in FIG. 2, the tensioner 20 includes a main body 21, a cylinder 22 formed inside the main body 21, and a plunger 23 provided inside the cylinder 22 so as to be able to appear and retract.

  A spring 24 is provided inside the cylinder 22 and is always urged by the urging force of the spring 24 in a direction in which the plunger 23 protrudes from the cylinder 22, that is, a direction in which the timing chain 13 is pressed.

  Further, an oil supply path 31 communicated with an oil pump (not shown) is connected to the cylinder 22 via a check valve 25. The check valve 25 permits oil inflow from the oil supply path 31 to the inside of the cylinder 22, while prohibiting oil outflow from the cylinder 22 to the oil supply path 31. Thus, the oil is supplied into the cylinder 22 through the oil supply passage 31 and the check valve 25 to fill the cylinder 22.

  The tensioner 20 is operated by the oil (specifically, its pressure) and presses the tension lever 16 together with the timing chain 13 to automatically adjust the tension of the timing chain 13.

Next, an oil passage structure for supplying oil to one tensioner 20 (the tensioner 20 provided in the right bank as viewed in FIG. 1) will be described.
FIG. 3 schematically shows the oil passage structure.

  As shown in FIG. 3, a recessed portion 17 is formed in the attachment portion of the tensioner 20 in the internal combustion engine 10, and the tensioner 20 is attached so as to close the recessed portion 17. As a result, an oil storage chamber 32 is defined between the internal combustion engine 10 and the tensioner 20 by the recess 17 and the wall surface of the tensioner 20. Further, inside the cylinder block 10a of the internal combustion engine 10, an oil gallery 33 for supplying oil to each part of the internal combustion engine 10, and the oil gallery 33 and the oil storage chamber 32 (specifically, the concave portion 17) are communicated. The oil supply path 31 is formed. Further, a concave portion 26 is formed on the surface of the oil storage chamber 32 in the tensioner 20, and an oil suction port 27 for sucking oil into the cylinder 22 is opened in the concave portion 26.

  In the oil passage structure according to the present embodiment, the oil pump and the tensioner 20 are communicated with each other through the oil supply passage 31 and the oil storage chamber 32, and oil is supplied from the oil pump to the tensioner 20.

  By the way, when the operation of the internal combustion engine 10 is stopped, the operation of the oil pump is also stopped and the oil supply is stopped, so that the oil inside the oil supply path 31 flows down. As a result, part of the oil in the oil storage chamber 32 also flows down, so that the oil level in the oil storage chamber 32 is lowered.

FIG. 4 shows a side structure of the recess 17.
As shown in FIG. 4, the oil supply path 31 communicates with a vertically lower position in the concave portion 17. The oil supply path 31 is formed in a shape extending in the horizontal direction from the recess 17 (see FIG. 3), and communicates with an oil gallery for supplying oil to each part of the internal combustion engine 10. Therefore, when the operation of the internal combustion engine 10 is stopped, the oil level in the oil storage chamber 32 is lowered to the lower end in the vertical direction at the communication port 31a of the oil supply path 31 (the level indicated by the alternate long and short dash line in the figure). become. On the other hand, as indicated by a broken line in the figure, the oil suction port 27 formed in the tensioner 20 opens at a position above the communication port 31a in the vertical direction.

  Therefore, when the internal combustion engine 10 is restarted without any countermeasure being taken and the tension of the timing chain 13 (FIG. 2) becomes weak and the check valve 25 of the tensioner 20 is opened, air is introduced into the cylinder 22. Inhaled. In this case, the performance of the tensioner 20 is remarkably deteriorated, the vibration of the timing chain 13 is increased, and noise is generated.

  In view of this point, in the present embodiment, an intermediate member 40 is provided in the internal combustion engine 10 in order to store a sufficient amount of oil in the oil storage chamber 32 when the operation of the internal combustion engine 10 is stopped. Yes.

FIG. 5 shows a cross-sectional structure of the internal combustion engine 10 at the portion where the tensioner 20 is attached.
As shown in FIG. 5, an intermediate member 40 is provided between the internal combustion engine 10 and the tensioner 20. The intermediate member 40 has a hollow structure, and the volume of the hollow portion 41 of the intermediate member 40 is set larger than the volume of the oil storage chamber 32 excluding the intermediate member 40.

FIG. 6 shows a side structure of the intermediate member 40 along the line AA in FIG. 5, and FIG. 7 shows a side structure of the intermediate member 40 viewed from the direction of arrow B in FIG.
As shown in FIG. 6 and FIG. 7, the intermediate member 40 is formed in a shape in which a flat plate 42 and a plate 43 whose central portion protrudes are combined. By forming the intermediate member 40 in a shape in which the two plates are combined as described above, the hollow intermediate member 40 can be formed relatively easily. Through holes 42a and 43a are formed in portions corresponding to the walls of the hollow portions of the plates 42 and 43 to communicate the hollow portion 41 with the outside. Further, two insertion holes 44 are formed in the portion of the intermediate member 40 where the plates 42 and 43 are combined. The insertion holes 44 are formed with a burring 45 having a peripheral edge protruding in a cylindrical shape from the plate 42 side through burring.

FIG. 8 shows an enlarged part of the cross-sectional structure of the internal combustion engine 10 at the portion where the tensioner 20 is attached.
As shown in FIG. 8, screw holes 18 are formed in the internal combustion engine 10 at positions corresponding to the insertion holes 44 of the intermediate member 40. Further, insertion holes 28 are formed at positions corresponding to the respective insertion holes 44 of the tensioner 20. The screw 19 is screwed into the screw hole 18 through the insertion hole 28 of the tensioner 20 and the insertion hole 44 of the intermediate member 40. By screwing the screw 19 into the screw hole 18 in this way, the tensioner 20 is attached to the internal combustion engine 10 together with the intermediate member 40.

  During this attachment, the burring 45 formed in the insertion hole 44 of the intermediate member 40 is engaged with the insertion hole 28 of the tensioner 20. Therefore, compared to the case where the burring 45 is not formed, when the tensioner 20 and the intermediate member 40 are attached to the internal combustion engine 10, the positioning of the intermediate member 40 with respect to the tensioner 20, and consequently the positioning of the tensioner 20 and intermediate member 40 with respect to the internal combustion engine 10. Can be easily performed.

FIG. 9 shows an enlarged part of the cross-sectional structure of the intermediate member 40.
As shown in FIG. 9, the plate 42 is formed by forming a coating layer L2 of an elastic material (for example, nitrile rubber) on the surface of a base material L1 formed of a steel plate or the like. The covering layer L2 functions as a sealing material when the intermediate member 40 is attached to the internal combustion engine 10. Specifically, the coating layer L2 prevents oil leakage from between the plates 42 and 43 to the outside of the hollow portion 41 (FIG. 5) and oil leakage from between the intermediate member 40 and the tensioner 20 to the outside. Is done.

  By providing such an intermediate member 40, during operation of the internal combustion engine 10, the oil discharged from the oil pump is “oil supply passage 31 → the through hole 43 a of the plate 43 → the hollow portion 41 → the through hole 42 a of the plate 42 → It flows in the order of the recess 26 of the tensioner 20 → the oil suction port 27 of the tensioner 20, and is sucked into the tensioner 20.

In FIG. 10, the figure which looked at the intermediate member 40 from the plate 42 side is shown.
FIG. 10 also shows the vertical direction in a state where the intermediate member 40 is attached to the internal combustion engine 10.

  As shown in FIG. 10, the through hole 42 a of the plate 42 is formed at a position near the lower end in the vertical direction in the hollow portion 41. On the other hand, the through hole 43 a of the plate 43 is formed at a position near the upper end of the hollow portion 41 in the vertical direction. As described above, in the present embodiment, the through hole 42 a of the plate 42 of the intermediate member 40 is formed at a lower position in the vertical direction than the through hole 43 a of the plate 43.

  Here, the through hole 42 a of the plate 42 communicates with the cylinder 22 of the tensioner 20 via the recess 26 and the oil suction port 27 of the tensioner 20. When the operation of the internal combustion engine 10 is stopped, although oil leaks from between the cylinder 22 and the plunger 23 and the oil pressure inside the cylinder 22 is reduced, the inside of the cylinder 22 is filled with oil. It is in the state that was done. Therefore, the oil in the hollow portion 41 of the intermediate member 40 does not flow out from the through hole 42a of the plate 42 to the tensioner 20 side.

  On the other hand, the through-hole 43 a of the plate 43 communicates with the oil supply path 31. If the oil in the oil supply passage 31 flows down when the operation of the internal combustion engine 10 is stopped, the oil in the oil storage chamber 32 also flows down accordingly. At this time, the oil in the hollow portion 41 of the intermediate member 40 flows out from the through hole 43a of the plate 43 to the oil supply path 31 side.

  However, in the present embodiment, the through hole 43 a of the plate 43 of the intermediate member 40 is formed at a position above the communication port 31 a of the oil supply passage 31 in the oil storage chamber 32 in the vertical direction. Therefore, when the operation of the internal combustion engine 10 is stopped, although the oil in the oil storage chamber 32 flows down to the outside, the oil is stored in the intermediate member 40 (hollow portion 41). In the present embodiment, the through hole 42 a of the plate 42 of the intermediate member 40 is formed at a lower position in the vertical direction than the through hole 43 a of the plate 43. Therefore, when the internal combustion engine 10 is restarted, the oil stored in the hollow portion 41 of the intermediate member 40 is sucked into the tensioner 20 through the through hole 42a of the plate 42. As a result, when the internal combustion engine 10 is restarted, air is suppressed from being sucked into the cylinder 22 of the tensioner 20, and a decrease in performance of the tensioner 20 is suppressed.

  In the oil passage structure according to the present embodiment, when the operation of the internal combustion engine 10 is stopped, the oil level of the hollow portion 41 of the intermediate member 40 is the lower end of the through-hole 43a of the plate 43 (indicated by a one-dot chain line in the figure). To the level shown). Further, when the oil level of the hollow portion 41 becomes lower than the upper end of the through hole 42a of the plate 42 (level indicated by a two-dot chain line in the drawing), air is sucked into the tensioner 20 when the internal combustion engine 10 is restarted. become. Therefore, in the present embodiment, the tensioner 20 is not inhaled by the tensioner 20 when the internal combustion engine 10 is restarted through the setting of the formation positions of the through holes 42a and 43a in the intermediate member 40 and the shape of the hollow portion 41. It is possible to set an upper limit value of the amount of oil that can be inhaled to 20.

  In view of this point, in the present embodiment, the positions where the through holes 42a and 43a are formed and the shape of the hollow portion 41 are set so that a sufficient amount of oil can be secured. As a result, the intake of air into the cylinder 22 of the tensioner 20 when the internal combustion engine 10 is restarted, and thus the performance degradation of the tensioner 20 is appropriately suppressed.

  Further, in the present embodiment, since the volume of the hollow portion 41 of the intermediate member 40 is set larger than the volume of the oil storage chamber 32 excluding the intermediate member 40 as described above, the hollow in the oil storage chamber 32 is set. A space other than the portion 41 can be reduced. As a result, it is possible to suppress the performance deterioration of the tensioner 20 when the internal combustion engine 10 is restarted with the small-capacity oil storage chamber 32.

  Furthermore, in the present embodiment, the shape of the oil storage chamber 32 and the oil storage chamber 32 can be provided as long as the intermediate member 40 formed in a shape that does not cause oil shortage when the internal combustion engine 10 is restarted can be attached. The formation position of the communication port 31a of the oil supply passage 31 and the formation position of the oil suction port 27 of the tensioner 20 can be freely set. Therefore, the degree of freedom for setting the shape and forming position can be remarkably increased.

  Therefore, the shape of the oil storage chamber 32 can be set with a high degree of freedom while it is possible to appropriately suppress a decrease in performance of the tensioner 20 when the internal combustion engine 10 is restarted.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) A hollow intermediate member 40 is interposed between the internal combustion engine 10 and the tensioner 20. Further, through holes 42 a and 43 a are formed in the plate 42 on the tensioner 20 side and the plate 43 on the oil supply path 31 side in the hollow portion 41 of the intermediate member 40, respectively. It was set above the vertical direction from the formation position of the through hole 42a. Therefore, the shape of the oil storage chamber 32 can be set with a high degree of freedom while it is possible to appropriately suppress a decrease in performance of the tensioner 20 when the internal combustion engine 10 is restarted.

(2) Since the intermediate member 40 is formed in a shape in which two plates are combined, the hollow intermediate member 40 can be easily formed.
(3) Since the volume of the hollow portion 41 of the intermediate member 40 is larger than the volume of the portion of the oil storage chamber 32 excluding the intermediate member 40, the tensioner 20 when the internal combustion engine 10 is restarted with the small capacity of the oil storage chamber 32. The performance degradation can be suppressed.

  (4) The burring 45 is formed in the insertion hole 44 of the intermediate member 40. Therefore, when attaching the tensioner 20 and the intermediate member 40 to the internal combustion engine 10, the tensioner 20 and the intermediate member 40 can be easily positioned with respect to the internal combustion engine 10, and workability related to the attachment can be improved. .

  (5) Since the intermediate member 40 having the function of the sealing material is provided, oil leaks from between the plates 42 and 43 to the outside of the hollow portion 41 and between the intermediate member 40 and the tensioner 20 to the outside. Oil leakage can be prevented, and the oil sucked into the tensioner 20 when the internal combustion engine 10 is restarted can be suitably secured.

The embodiment described above may be modified as follows.
In addition to or instead of the burring 45, a burring having a shape in which the peripheral edge of the insertion hole 44 protrudes in a cylindrical shape from the plate 43 side may be formed. According to this configuration, when the intermediate member is attached to the internal combustion engine 10, the newly formed burring is engaged with the screw hole 18 of the internal combustion engine 10, thereby easily positioning the intermediate member with respect to the internal combustion engine 10. Can do.

-Burring of the intermediate member may be omitted.
In the above embodiment, the intermediate member has a function as a sealing material by using the plate 42 having the coating layer L2. Instead, as shown in FIGS. 11 and 12, the intermediate member 50 is formed of an elastic material (for example, nitrile rubber) between the plates 52 and 53 and the surface of the plate 52 on the tensioner 20 (FIG. 12) side. By providing the sealed members 56 and 57, the intermediate member 50 may have a function as a sealing material. 11 shows a side structure of the intermediate member 50, and FIG. 12 shows a cross-sectional structure of the intermediate member 50 along the line CC in FIG.

  -If the shape of an intermediate member is hollow shape, it will not be restricted to the shape which put together two plates, but can be changed arbitrarily. For example, the shape which combined the plate and the block which has a recessed part, the shape which match | combined the two blocks in which the recessed part was formed in at least one, etc. are employable.

-You may set the volume of the hollow part of an intermediate member smaller than the volume of the part except the intermediate member in the oil storage chamber 32. FIG.
In place of the intermediate member, as shown in FIG. 13, pipes 60 and 61 extending inside the oil storage chamber 32 may be attached to the oil suction port 27 of the tensioner 20 and the communication port 31 a of the oil supply path 31. Good. By providing such pipes 60, 61, during operation of the internal combustion engine 10, the oil discharged from the oil pump is “oil supply passage 31 → pipe 60 → oil storage chamber 32 → pipe 61 → oil intake port of the tensioner 20. 27 ”in order, and is sucked into the tensioner 20.

FIG. 14 shows a view of the recess 17 of the internal combustion engine 10 as viewed from the tensioner 20 side. FIG. 14 also shows the vertical direction.
As shown in FIG. 14, each pipe 60, so that the opening position of the pipe 61 communicating with the oil suction port 27 is below the opening position of the pipe 60 communicating with the oil supply path 31 in the vertical direction. 61 is provided. Specifically, the pipe 60 is attached to the oil supply path 31 so as to extend upward in the vertical direction in the oil storage chamber 32. The pipe 61 is attached to the oil suction port 27 so as to extend downward in the vertical direction in the oil storage chamber 32.

  By providing such pipes 60 and 61, a part of the oil in the oil storage chamber 32 flows down through the pipe 60 and the oil supply passage 31 when the operation of the internal combustion engine 10 is stopped, but in the oil storage chamber 32. Oil remains and is stored. When the internal combustion engine 10 is restarted, the oil stored in the oil storage chamber 32 is sucked into the tensioner 20 (FIG. 13) via the pipe 61. As a result, when the internal combustion engine 10 is restarted, air is suppressed from being sucked into the cylinder 22 of the tensioner 20, and a decrease in performance of the tensioner 20 is suppressed.

  Here, in the above configuration, when the operation of the internal combustion engine 10 is stopped, the oil level in the oil storage chamber 32 is lowered to the lower end of the opening of the pipe 60 (level indicated by a one-dot chain line in the drawing). Further, when the oil level in the oil storage chamber 32 becomes lower than the upper end of the opening of the pipe 61 (level indicated by a two-dot chain line in the drawing), air is sucked into the tensioner 20 when the internal combustion engine 10 is restarted. become. Therefore, in the above-described configuration, the oil that can be sucked into the tensioner 20 without causing the tensioner 20 to suck air when the internal combustion engine 10 is restarted through the setting of the shapes of the pipes 60 and 61 and the shape of the oil storage chamber 32. It is possible to set an upper limit for the amount.

  Therefore, in the above configuration, the shape of the pipes 60 and 61 and the shape of the oil storage chamber 32 may be set so that a sufficient amount of oil can be secured. As a result, air suction into the cylinder 22 of the tensioner 20 when the internal combustion engine 10 is restarted, and thus performance degradation of the tensioner 20 can be appropriately suppressed.

  Further, according to the above configuration, the shape of the oil storage chamber 32, the position where the communication port 31a is formed in the oil storage chamber 32, and the oil suction port 27 in the tensioner 20 are compared with the configuration in which the pipes 60 and 61 are not provided. The degree of freedom of setting when setting the formation position to avoid oil shortage when the internal combustion engine 10 is restarted can be remarkably increased.

  Therefore, the configuration of the oil storage chamber 32 can be set with a high degree of freedom while the performance of the tensioner 20 can be appropriately suppressed even when the internal combustion engine 10 is restarted with the above configuration.

  The oil passage structure according to the embodiment includes an oil passage for supplying oil to an oil pressure operating device attached to the internal combustion engine through an oil supply passage and an oil storage chamber formed in the internal combustion engine. If it is a structure, it can apply after changing the structure suitably. Examples of such oil pressure operating devices include a tensioner that adjusts the tension of the timing belt, a tensioner that adjusts the tension of the timing belt, and a lash adjuster that adjusts the valve clearance.

(Second Embodiment)
Hereinafter, a second embodiment that embodies an oil passage structure of an internal combustion engine according to the present invention will be described focusing on differences from the first embodiment.

The present embodiment and the first embodiment differ in the opening position of the oil supply passage in the oil storage chamber and the shape of the intermediate member.
First, the opening position of the oil supply path in the oil storage chamber will be described.

FIG. 15 shows a side surface structure of a recess formed in a tensioner mounting portion in an internal combustion engine. FIG. 15 also shows the vertical direction.
As shown in FIG. 15, an oil supply path 71 is formed inside the cylinder block 70 a of the internal combustion engine 70. The oil supply path 71 communicates with an oil pump (both not shown) through an oil gallery, and is open at a recess 17 formed in the internal combustion engine 70. The oil supply path 71 is open at an upper position in the vertical direction in the recess 17. The oil supply path 71 is formed in a shape extending in the horizontal direction from the recess 17.

  Here, when the operation of the internal combustion engine 70 is stopped, the oil level in the oil storage chamber 32 reaches the lower end in the vertical direction at the communication port 71a of the oil supply passage 71 (level indicated by a one-dot chain line in the figure). It begins to decline. On the other hand, as indicated by a broken line in the figure, the oil suction port 27 of the tensioner 20 is opened at a position slightly above the communication port 71a. Therefore, if the internal combustion engine 70 is restarted without any countermeasure being taken, air is sucked into the tensioner 20 and the performance of the tensioner 20 is significantly reduced.

  In view of this point, in the present embodiment, an intermediate member is provided in the internal combustion engine 70 in order to store a sufficient amount of oil in the oil storage chamber 32 when the operation of the internal combustion engine 70 is stopped. Yes.

FIG. 16 shows a cross-sectional structure of the internal combustion engine 70 at the portion where the tensioner 20 is attached.
As shown in FIG. 16, in the present embodiment, the tensioner 20 is attached so as to close the recess 17 of the internal combustion engine 70. As a result, an oil storage chamber 32 is defined between the internal combustion engine 70 and the tensioner 20. An intermediate member 80 is provided between the internal combustion engine 70 and the tensioner 20.

Next, the shape of the intermediate member 80 will be described.
FIG. 17 shows a side structure of the intermediate member 80, and FIG. 18 shows a side structure of the intermediate member 80 viewed from the direction of arrow D in FIG.

  As shown in FIGS. 17 and 18, the intermediate member 80 is formed in a flat plate shape. The intermediate member 80 is formed with a through hole 81. Furthermore, two insertion holes 82 are formed at the edge of the intermediate member 80, and a burring 83 having a shape in which the peripheral edge protrudes in a cylindrical shape is formed in the insertion holes 82 through burring. .

FIG. 19 shows an enlarged part of a cross-sectional structure of the internal combustion engine 70 at the portion where the tensioner 20 is attached.
As shown in FIG. 19, screw holes 18 are formed in the internal combustion engine 70 at positions corresponding to the respective insertion holes 82 of the intermediate member 80. Further, insertion holes 28 are formed at positions corresponding to the respective insertion holes 82 of the tensioner 20. The screw 19 is screwed into the screw hole 18 through the insertion hole 28 of the tensioner 20 and the insertion hole 82 of the intermediate member 80. By screwing the screw 19 into the screw hole 18 in this way, the tensioner 20 is attached to the internal combustion engine 70 together with the intermediate member 80.

  In this attachment, the burring 83 formed in the insertion hole 82 of the intermediate member 80 is engaged with the insertion hole 28 of the tensioner 20. Therefore, when the tensioner 20 and the intermediate member 80 are attached to the internal combustion engine 70 as compared with the case where the burring 83 is not formed, the positioning of the intermediate member 80 with respect to the tensioner 20, and consequently the positioning of the tensioner 20 and the intermediate member 80 with respect to the internal combustion engine 70. Can be easily performed.

  In addition, as the intermediate member 80, what formed the coating layer with the elastic material (for example, nitrile rubber) on the surface of the base material formed with the steel plate etc. is employ | adopted. This covering layer functions as a sealing material when the intermediate member 80 is attached to the internal combustion engine 70. Specifically, this coating layer prevents oil leakage between the internal combustion engine 70 and the intermediate member 80 and between the tensioner 20 and the intermediate member 80.

  By providing such an intermediate member 80, during operation of the internal combustion engine 70, the oil discharged from the oil pump is “oil supply path 71 (FIG. 16) → through port 81 of the intermediate member 80 → concave portion 26 of the tensioner 20 → The oil flows in the order of “the oil suction port 27 of the tensioner 20” and is sucked into the tensioner 20.

FIG. 20 shows a side structure of the recess 17 of the internal combustion engine 70. FIG. 20 also shows the vertical direction.
As shown in FIG. 20, the through hole 81 (shown by a broken line in the drawing) of the intermediate member 80 is formed at a position near the lower end in the vertical direction of the recess 17.

  Here, the through hole 81 of the intermediate member 80 is communicated with the cylinder 22 of the tensioner 20 through the recess 26 and the oil suction port 27 of the tensioner 20 (see FIG. 16). Therefore, the oil in the oil storage chamber 32 does not flow out from the through hole 81 of the intermediate member 80 to the tensioner 20 side. On the other hand, in the present embodiment, the through hole 81 of the intermediate member 80 is formed at a lower position in the vertical direction than the communication port 71 a of the oil supply passage 71 in the oil storage chamber 32. Therefore, when the operation of the internal combustion engine 70 is stopped, although a part of the oil in the oil storage chamber 32 flows down through the oil supply passage 71, the oil remains in the oil storage chamber 32. This will be stored.

  When the internal combustion engine 70 is restarted, the oil stored in the oil storage chamber 32 is sucked into the tensioner 20 through the through hole 81 of the intermediate member 80. Thereby, when the internal combustion engine 70 is restarted, the intake of air into the tensioner 20 is suppressed, and the performance degradation of the tensioner 20 is suppressed.

  In the oil passage structure according to the present embodiment, when the operation of the internal combustion engine 70 is stopped, the oil level in the oil storage chamber 32 is the lower end of the communication port 71a of the oil supply passage 71 (indicated by a one-dot chain line in FIG. 20). To the level shown). Further, when the oil level in the oil storage chamber 32 becomes lower than the upper end of the through-hole 81 of the intermediate member 80 (level indicated by a two-dot chain line in the drawing), air is sucked into the tensioner 20 when the internal combustion engine 70 is restarted. Will come to be. Therefore, in the present embodiment, when the internal combustion engine 70 is restarted, the formation position of the through hole 81 in the intermediate member 80, the shape of the oil storage chamber 32, and the formation position of the communication port 71a in the oil storage chamber 32 are set. It is possible to set an upper limit value of the amount of oil that can be inhaled by the tensioner 20 without causing the tensioner 20 to inhale air.

  In view of this point, in the present embodiment, the formation position of the through hole 81, the shape of the oil storage chamber 32, and the formation position of the communication port 71a are provided so that a sufficient amount of oil can be secured. Is set. As a result, air suction into the tensioner 20 when the internal combustion engine 70 is restarted, and thus performance degradation of the tensioner 20 are appropriately suppressed.

  Further, according to the present embodiment, through the setting of the formation position of the through-hole 81 in the intermediate member 80, the oil is supplied from the oil storage chamber 32 to the tensioner 20 regardless of the position of the oil suction port 27 formed in the tensioner 20. It is possible to set the vertical position of the oil inlet through which the oil is sucked. Therefore, the degree of freedom for setting the position of the oil inlet can be remarkably increased as compared with the structure in which the intermediate member 80 is not provided. Furthermore, in setting the shape of the oil storage chamber 32 and the formation position of the communication port 71a in the oil storage chamber 32 so as not to cause a shortage of oil when the internal combustion engine 70 is restarted, these shapes and formation The degree of freedom for setting the position can be remarkably increased.

  Therefore, the shape of the oil storage chamber 32 can be set with a high degree of freedom while it is possible to appropriately suppress a decrease in performance of the tensioner 20 when the internal combustion engine 70 is restarted.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) An intermediate member 80 is interposed between the internal combustion engine 70 and the tensioner 20, and a through-hole that communicates the oil storage chamber 32 and the tensioner 20 at a position below the communication port 71 a in the intermediate member 80 in the vertical direction. 81 was formed. Therefore, the shape of the oil storage chamber 32 can be set with a high degree of freedom while it is possible to appropriately suppress a decrease in performance of the tensioner 20 when the internal combustion engine 70 is restarted.

  (2) The burring 83 is formed in the insertion hole 82 of the intermediate member 80. Therefore, when the tensioner 20 and the intermediate member 80 are attached to the internal combustion engine 10, the tensioner 20 and the intermediate member 80 can be easily positioned with respect to the internal combustion engine 10, and workability related to the attachment can be improved. .

  (3) Since the intermediate member 80 having the function of the sealing material is provided, oil leakage between the internal combustion engine 70 and the intermediate member 80 or between the tensioner 20 and the intermediate member 80 can be prevented. The oil sucked into the tensioner 20 when the internal combustion engine 70 is restarted can be suitably secured.

The embodiment described above may be modified as follows.
-You may make it change at least one of each burring 83 to the burring of the shape which made the peripheral edge of the insertion hole 82 protrude cylindrically in the internal combustion engine 70 side. According to this configuration, when the intermediate member is attached to the internal combustion engine 70, the intermediate member is easily positioned with respect to the internal combustion engine 70 by engaging the burring whose projection direction is changed with the screw hole 18 of the internal combustion engine 70. be able to.

-Burring of the intermediate member may be omitted.
In the above embodiment, an intermediate member having a coating layer is used to give the intermediate member a function as a sealing material. Instead, as shown in FIGS. 21 and 22, by providing seal members 96 and 97 made of an elastic material (for example, nitrile rubber) on both surfaces of the intermediate member 90, the intermediate member 90 is used as a sealing material. You may make it give the function of. 21 shows a side structure of the intermediate member 90, and FIG. 22 shows a cross-sectional structure of the intermediate member 90 along the line EE of FIG.

  The oil passage structure according to the embodiment includes an oil passage for supplying oil to an oil pressure operating device attached to the internal combustion engine through an oil supply passage and an oil storage chamber formed in the internal combustion engine. If it is a structure, it can apply after changing the structure suitably. Examples of such oil pressure operating devices include a tensioner that adjusts the tension of the timing belt, a tensioner that adjusts the tension of the timing belt, and a lash adjuster that adjusts the valve clearance.

1 is a schematic diagram showing a schematic configuration of an internal combustion engine to which an oil passage structure according to a first embodiment embodying the present invention is applied. Sectional drawing which shows the cross-section of a tensioner. 1 is a schematic diagram illustrating a schematic configuration of an oil passage structure according to a first embodiment. The side view which shows the side structure of a recessed part. Sectional drawing which shows the cross-section of the internal combustion engine in the attachment part of a tensioner. The side view which shows the side structure of the intermediate member along the AA line of FIG. The side view which shows the side structure of the intermediate member seen from the arrow B direction of FIG. The expanded sectional view which expands and shows a part of sectional structure of the internal combustion engine in the attachment part of a tensioner. The expanded sectional view which expands and shows a part of sectional structure of an intermediate member. The side view which shows the side structure of an intermediate member. The side view which shows the side structure of the intermediate member concerning the modification of 1st Embodiment. Sectional drawing which shows the cross-section of the intermediate member along CC line | wire of FIG. Sectional drawing which shows the cross-section of the oil passage structure concerning the other modification of 1st Embodiment. The side view which shows the side structure of the recessed part of the internal combustion engine in the modification. The side view which shows the side structure of the recessed part of the internal combustion engine with which 2nd Embodiment which actualized this invention is applied. Sectional drawing which shows the cross-section of the internal combustion engine in the attachment part of a tensioner. The side view which shows the side structure of an intermediate member. The side view which shows the side structure of the intermediate member seen from the arrow D direction of FIG. The expanded sectional view which expands and shows a part of sectional structure of the internal combustion engine in the attachment part of a tensioner. The side view which shows the side structure of the recessed part of an internal combustion engine. The side view which shows the side structure of the intermediate member concerning the modification of 2nd Embodiment. Sectional drawing which shows the cross-section of the intermediate member along the EE line | wire of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10,70 ... Internal combustion engine, 10a, 70a ... Cylinder block, 11 ... Intake camshaft, 12 ... Exhaust camshaft, 13 ... Timing chain, 14 ... Crankshaft, 15 ... Tensioner device, 16 ... Tension lever, 17 ... Recessed part, DESCRIPTION OF SYMBOLS 18 ... Screw hole, 19 ... Screw, 20 ... Tensioner, 21 ... Main body, 22 ... Cylinder, 23 ... Plunger, 24 ... Spring, 25 ... Check valve, 26 ... Recess, 27 ... Oil inlet, 28 ... Insertion hole, 31, 71 ... oil supply path, 31 a, 71 a ... communication port, 32 ... oil storage chamber, 33 ... oil gallery, 40, 50, 80, 90 ... intermediate member, 41 ... hollow portion, 42, 43, 52, 53 ... Plate, 42a, 43a, 81 ... through hole, 44, 82 ... insertion hole, 45, 83 ... burring, 50 ... intermediate member, 56, 57, 96, 9 ... seal member, 60, 61 ... pipe.

Claims (7)

Oil is supplied to an oil pressure operating device attached to the internal combustion engine through an oil supply passage formed inside the internal combustion engine, and communicates with the oil supply passage and is also connected to the internal combustion engine and the oil pressure operating device. In an oil passage structure of an internal combustion engine comprising an oil storage chamber defined by
A hollow intermediate member is interposed between the internal combustion engine and the oil pressure operating device,
Through holes are respectively formed in the wall portion on the oil pressure operating device side and the wall portion on the oil supply path side in the hollow portion of the intermediate member, and the oil storage chamber and the oil pressure operating device are connected through the through holes. Communicated,
An oil passage structure for an internal combustion engine, wherein the through hole in the wall portion on the oil supply path side is formed at a position vertically above the through hole in the wall portion on the oil pressure operating device side. The oil passage structure of the internal combustion engine according to claim 1,
The intermediate member is formed in a shape in which two plates are combined. An oil passage structure for an internal combustion engine, wherein: The oil passage structure of the internal combustion engine according to claim 1 or 2,
An oil passage structure for an internal combustion engine, wherein the volume of the hollow portion of the intermediate member is set to be larger than the volume of the portion of the oil reservoir chamber excluding the intermediate member. Oil is supplied to an oil pressure operating device attached to the internal combustion engine through an oil supply passage formed inside the internal combustion engine, and communicates with the oil supply passage and is also connected to the internal combustion engine and the oil pressure operating device. In an oil passage structure of an internal combustion engine comprising an oil storage chamber defined by
An intermediate member is interposed between the internal combustion engine and the oil pressure operating device,
The intermediate member is formed with a through-hole communicating with the oil storage chamber and the oil pressure operating device at a position below the communication port of the oil supply passage in the oil storage chamber in the vertical direction. An oil passage structure for an internal combustion engine. Insertion holes are respectively formed in the oil pressure operating device and the intermediate member, and screw holes are formed in the internal combustion engine, and screws are screwed into the screw holes through the insertion holes. The intermediate member is also attached to the internal combustion engine,
The oil passage structure of the internal combustion engine according to any one of claims 1 to 4, wherein a burring is formed in the insertion hole of the intermediate member. In the oil passage structure of the internal combustion engine according to any one of claims 1 to 5,
The intermediate member has a function as a sealing material for sealing oil leakage from between the internal combustion engine and the oil pressure operating device. In the oil passage structure of the internal combustion engine according to any one of claims 1 to 6,
The internal combustion engine transmits power from a crankshaft to a camshaft via a winding transmission member,
The oil pressure structure of the internal combustion engine, wherein the oil pressure operating device is a tensioner that adjusts a tension of the winding transmission member.

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