JP2019206944A - Internal combustion engine - Google Patents

Abstract

To facilitate hardening of a liquid gasket to exert adhesive force while suppressing an increase in man-hour and cost.SOLUTION: An internal combustion engine includes: a first member attached to the internal combustion engine; a second member to be combined with and facing the first member; a first member-side boss formed protrusively toward the second member on a surface of the first member facing the second member; a second member-side boss formed protrusively toward the first member on a surface of the second member facing the first member; and a liquid gasket disposed between the first member-side boss and the second member-side boss. Further, the first member-side boss has a screw hole. The second member-side boss reaches from an outer wall of the second member to the liquid gasket and has a communication hole into which a fastening bolt fastened to the screw hole is inserted.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an internal combustion engine.

  Conventionally, a liquid gasket is used for each part of an internal combustion engine. For example, a liquid gasket formed between a first member having a first joint surface, a second member having a second joint surface opposite to the first joint surface, and the first joint surface and the second joint surface A seal structure provided with a reservoir is known (see, for example, Patent Document 1). The liquid gasket is hardened when moisture is supplied, and easily exhibits an adhesive force. In the seal structure disclosed in Patent Document 1, at least one of the first member and the second member is provided with a through hole that communicates with a reservoir of the liquid gasket.

JP 2018-44645 A

  However, the seal structure of Patent Document 1 requires a step of providing a through hole communicating with the reservoir of the liquid gasket, which may increase man-hours and costs.

  Accordingly, an object of the internal combustion engine disclosed in this specification is to cure the liquid gasket and to exert an adhesive force while suppressing an increase in man-hours and costs.

  An internal combustion engine disclosed in the present specification includes a first member mounted on the internal combustion engine, a second member that is opposed to the first member and combined with the first member, and the second member of the first member. A boss on the first member side formed by projecting toward the second member on the surface facing the member, and projecting toward the first member on the surface facing the first member of the second member A boss on the second member side, and a liquid gasket interposed between the boss on the first member side and the boss on the second member side, and the boss on the first member side is a screw. The boss on the second member side has a communication hole through which a fastening bolt that reaches the liquid gasket from the outer wall surface of the second member and is tightened into the screw hole is inserted.

  According to the internal combustion engine disclosed in the present specification, the liquid gasket can be cured and the adhesive force can be exerted while suppressing an increase in man-hours and costs.

FIG. 1 is an explanatory view schematically showing an internal combustion engine of an embodiment. FIG. 2 is an explanatory view showing the internal combustion engine facing surface side of the partition wall provided in the first cover included in the timing chain storage case provided in the internal combustion engine of the embodiment. FIG. 3 is an explanatory view showing the second cover facing surface side of the partition wall provided in the first cover included in the timing chain storage case provided in the internal combustion engine of the embodiment. FIG. 4 is an explanatory view showing a first cover facing surface of a second cover included in the timing chain storage case provided in the internal combustion engine of the embodiment. FIG. 5 is an explanatory view showing an outer wall surface of a second cover included in the timing chain storage case provided in the internal combustion engine of the embodiment. 6 is a cross-sectional view in which the construction portion of the liquid gasket is taken as a cross section at a position corresponding to the line XX shown in FIG. FIG. 7 is an example of a graph showing the curing rate of the liquid gasket.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, in the drawings, the dimensions, ratios, and the like of each part may not be shown so as to completely match the actual ones. In some cases, details are omitted in some drawings. In the following description, the front side and the rear side of the internal combustion engine are set as shown in FIG.

  First, a schematic configuration of the internal combustion engine 1 of the present embodiment will be described with reference to FIG. The internal combustion engine 1 includes a cylinder block 2 and a cylinder head 3 mounted on the upper side of the cylinder block 2. A crankshaft 4 is attached to the cylinder block 2. The crankshaft 4 extends from the front side to the rear side of the internal combustion engine 1. A sprocket 4 a is mounted on the front side of the crankshaft 4. Two camshafts 5 are attached to the cylinder head 3. The camshaft 5 extends from the front side to the rear side of the internal combustion engine. A sprocket 5 a is mounted on the front side of each camshaft 5. One of the two camshafts 5 drives the intake valve to open and close, and the other drives the exhaust valve to open and close.

  The internal combustion engine 1 includes a timing chain 6 for transmitting the rotation of the crankshaft 4 to each camshaft 5. The timing chain 6 is stored in a timing chain storage case (hereinafter simply referred to as “storage case”) 7 attached to the front side end face of the internal combustion engine 1. In the present embodiment, the timing chain 6 which is an example of an endless transmission member is employed as a power transmission mechanism for transmitting the rotation of the crankshaft 4 to each camshaft 5. A transmission member may be employed. A timing gear can also be employed. Even when a timing belt or a timing gear is employed, a case similar to the storage case 7 is employed.

  The storage case 7 is attached to the cylinder block 2 and the cylinder head 3 by bolt fastening. The storage case 7 includes a first cover 10 fixed to the cylinder block 2 and the cylinder head 3. The storage case 7 is combined with the first cover 10 so as to face the first cover 10, and is disposed on the opposite side of the cylinder block 2 and the cylinder head 3 across the first cover 10. 30.

  As shown in FIG. 1, the timing chain 6 is accommodated in a space S defined by the first cover 10 and the second cover 30. The first cover 10 corresponds to a first member, and the second cover 30 corresponds to a second member.

  In the space S, a sprocket 4 a provided on the crankshaft 4 and each sprocket 5 a provided on each camshaft 5 are arranged. And the timing chain 6 is hung on each sprocket 4a, 5a. Thereby, the rotation of the crankshaft 4 is transmitted to each camshaft 5 via the timing chain 6. Oil is supplied into the space S.

  Here, the first cover 10 will be described with reference to FIGS. 2 and 3. FIG. 2 shows the internal combustion engine facing surface 111 side of the partition wall 11 provided in the first cover 10, and FIG. 3 shows the second cover facing surface 112 side of the first cover 10. The partition wall 11 of the first cover 10 is provided with a notch 12 provided so as to avoid contact with each camshaft 5 in the upper part, and provided with an insertion hole 13 through which the crankshaft 4 is inserted in the lower part. Yes.

  Of the internal combustion engine facing surface 111 of the partition wall 11, a block facing portion 11 </ b> L that is a portion facing the cylinder block 2 protrudes toward the cylinder block 2 and surrounds the crankshaft 4. Is provided. The opposing surface 14 a of the first flange 14 facing the cylinder block 2 is pressed against the cylinder block 2. Oil is supplied to the region surrounded by the first flange 14. When the first flange 14 is pressed against the cylinder block 2, a liquid gasket is applied between the facing surface 14 a and the cylinder block 2, and a sealing property between the cylinder block 2 and the first cover 10 is ensured.

  In addition, the partition wall 11 is located away from the first flange 14 toward the notch 12, and protrudes toward the cylinder head 3 at a head facing portion 11 </ b> H that is a portion facing the cylinder head 3. A second flange 15 surrounding each camshaft 5 is provided. The second flange 15 extends along the edge of the notch 12. The opposing surface 15 a of the second flange 15 facing the cylinder head 3 is pressed against the cylinder head 3. Oil is supplied to the region surrounded by the second flange 15. When the second flange 15 is pressed against the cylinder head 3, it is liquid between the opposed surface 15 a of the second flange 15 and the cylinder head 3 as well as between the opposed surface 14 a of the first flange 14 and the cylinder block 2. A gasket is applied. Thereby, the sealing performance between the cylinder head 3 and the first cover 10 and the sealing performance of the space S communicating through the notch 12 are ensured.

  Of the internal combustion engine facing surface 111 of the partition wall 11, cover-side ribs 16 a and 16 b projecting toward the cylinder block 2 are provided at an intermediate portion 11 M located between the first flange 14 and the second flange 15. Yes. In the present embodiment, two cover-side ribs 16a and 16b are provided side by side in the direction in which the camshaft 5 is arranged (the left-right direction in FIG. 2). As shown in FIG. 2, liquid gaskets 16 a 1 and 16 b 1 are applied to the cover-side ribs 16 a and 16 b and fixed to the cylinder block 2. Since the liquid gaskets 16a1 and 16b1 can exert an adhesive action, the first cover 10 can be bonded and fixed to the cylinder block 2.

  Further, the partition wall 11 is provided with a bolt boss 17 through which a fastening bolt for fixing the storage case 7 to the cylinder block 2 is inserted at a position on the left side of the cover-side ribs 16a and 16b in FIG.

  Referring to FIG. 3, a third flange 18 is provided on the second cover facing surface 112 of the partition wall 11 so as to protrude toward the second cover 30 and substantially along the outer edge of the partition wall 11. A surface 18a of the third flange 18 facing the second cover 30 is joined to a fourth flange 35 provided on the second cover 30 described later via a liquid gasket. Thereby, the sealing performance between the cylinder head 3 and the first cover 10 and the sealing performance of the space S communicating through the notch 12 are ensured.

  Referring to FIG. 3, the first cover 10 includes a first boss 19, a second boss 20, a third boss 21, a fourth boss 22, and a fifth boss 23. The first boss 19 to the fifth boss 23 are formed so as to protrude toward the second cover 30. The first boss 19 to the fifth boss 23 are examples of a first member-side boss.

  The first boss 19 includes a facing surface 19a to which a liquid gasket is applied. The first boss 19 includes a screw hole 19b having a screw formed on the inner peripheral surface. The screw hole 19b has a bottom, and the bottom 19c appears on the internal combustion engine facing surface 111 side shown in FIG. The second boss 20, the third boss 21, and the fourth boss 22 are also provided with opposing surfaces 20a, 21a, and 22a, and screw holes 20b, 21b, and 22b, respectively. Moreover, each screw hole 20b, 21b, 22b is provided with bottom part 20c, 21c, 22c. Unlike the other bosses, the fifth boss 23 is provided with a facing surface 23a and a screw hole 23b like the other bosses. However, the screw hole 23b is a through hole and does not have a bottom portion.

  The first boss 19 to the fifth boss 23 are brought into contact with the sixth boss 36 to the tenth boss 40 provided on the second cover 30, which will be described later, and are bonded with a liquid gasket and bolted. Is done. This bonding and bolting will be described later.

  Next, the second cover 30 will be described with reference to FIGS. 4 and 5. 4 shows the first cover facing surface 311 of the cover side wall 31 provided in the second cover 30, and FIG. 5 shows the outer wall surface 312 of the cover side wall 31 provided in the second cover 30.

  The cover side wall 31 of the second cover 30 is provided with an insertion hole 33 into which the end of the crankshaft 32 is inserted and supported. The cover side wall 31 is provided with insertion holes 33 and 34 for supporting the end portions of the camshaft 5.

  The second cover 30 includes a sixth boss 36 to a tenth boss 40 on the first cover facing surface 311. The sixth boss 36 to the tenth boss 40 are formed so as to protrude toward the first cover 10. The sixth boss 36 to the tenth boss 40 are examples of the second member-side boss.

  The sixth boss 36 to the tenth boss 40 are brought into contact with the first boss 19 to the fifth boss 23, and are bonded by a liquid gasket and bolted. Thereby, the vibration of the 2nd cover 30 resulting from the vibration accompanying engine operation and generation | occurrence | production of noise are suppressed.

  The sixth boss 36 has a facing surface 36 a that faces the facing surface 19 a of the first boss 19 when the first cover 10 and the second cover 30 are combined. Similarly, the seventh boss 37 has a facing surface 37 a that faces the facing surface 20 a of the second boss 20, and the eighth boss 38 has a facing surface 38 a that faces the facing surface 21 a of the third boss 21. Further, the ninth boss 39 has a facing surface 39 a that faces the facing surface 22 a of the fourth boss 22, and the tenth boss 40 has a facing surface 40 a that faces the facing surface 23 a of the fifth boss 23.

  The sixth boss 36 is provided with a communication hole 36b. Here, with reference to FIG.6 and FIG.7, the communicating hole 36b is demonstrated. The seventh boss 37 to the tenth boss 40 are also provided with communication holes 37b, 38b, 39b, 40b, respectively, but these basic structures are common to the communication holes 36b. The communication hole 36b will be described as a representative.

  Referring to FIG. 6, the sixth boss 36 is disposed in a state in which the facing surface 36 a faces the facing surface 19 a of the first boss 19. A liquid gasket 42 is interposed between the facing surface 19a and the facing surface 36a. Here, generally known, for example, FIPG (Formed In Place Gasket) can be used as the liquid gasket 42. As the FIPG here, for example, a silicon rubber-based adhesive component such as TB1280E or TB1280D manufactured by ThreeBond Co., Ltd. is preferably used.

  Referring to FIG. 7, it can be seen that when the liquid gasket is placed in a high humidity environment, the curing speed thereof is increased. The liquid gasket 42 interposed between the first boss 19 and the sixth boss 36 is disposed in the space S to which oil is supplied. For this reason, when no measures are taken, the liquid gasket 42 is placed in an environment with low humidity, and it is considered that the curing and bonding speed of the liquid gasket 42 decreases. If the hardening and adhesion of the liquid gasket 42 do not proceed, the second cover 30 is not properly fixed to the first cover 10, and it is difficult to suppress the generation of vibration and noise in the second cover 30.

  Therefore, in the present embodiment, the liquid gasket 42 can come into contact with the atmosphere by providing the communication hole 36b. The communication hole 36 b reaches the liquid gasket 42 from the outer wall surface 312 side of the second cover 30. The shaft hole 41b of the fastening bolt 41 for bolting the sixth boss 36 to the first boss 19 is inserted into the communication hole 36b, but between the inner wall of the communication hole 36b and the shaft part 41b of the fastening bolt 41. Since the atmosphere can enter, the liquid gasket 42 can come into contact with the atmosphere. As a result, the liquid gasket 42 is cured and can exhibit an adhesive force.

  The bolt head 41a of the fastening bolt 41 is pressed against the second cover 30, but no gasket or the like is provided between the bolt head 41a and the second cover 30, and the atmosphere is And the second cover 30 can pass. Therefore, the atmosphere can enter the communication hole 36b.

  The fastening bolt 41 is inserted into the communication hole 36 b, passes through the layer of the liquid gasket 42, and is screwed into the screw hole 19 b of the first boss 19. Thereby, the second cover 30 is fixed to the first cover 10.

  As described above, moisture is required for the liquid gasket to be cured and to exert the adhesive force. In this embodiment, the penetration through which the bolt is inserted into the liquid gasket arranged in an environment where oil is supplied. Water is supplied using the holes. Therefore, it is not necessary to provide a hole only for supplying moisture to the liquid gasket. As a result, the liquid gasket can be cured and the adhesive force can be exhibited while suppressing an increase in man-hours and costs.

  In this embodiment, liquid gaskets are used in many places other than the liquid gasket 42 interposed between the first boss 19 and the sixth boss 36. For example, as shown in FIG. 2, liquid gaskets 16a1 and 16b1 are also applied to the cover-side ribs 16a and 16b. However, the cover-side ribs 16a and 16b are provided at positions where they can come into contact with the atmosphere. For this reason, the liquid gaskets 16a1 and 16b1 can be cured by moisture in the atmosphere and exhibit adhesive strength. In addition, the liquid gasket applied to the first flange 14 and the second flange 15 and the liquid gasket applied between the third flange 18 and the fourth flange 35 can also come into contact with the atmosphere, and are caused by moisture in the atmosphere. It can be cured and bonded.

  In the first cover 10 of the present embodiment, the first flange 14 and the second flange 15 are separated from each other. For this reason, in the first cover 10, the intermediate part 11 </ b> M, which is a part located between the first flange 14 and the second flange 15, has a small area in contact with the cylinder block 2 and the cylinder head 3. Therefore, in the first cover 10, the intermediate part 11 </ b> M is a part having lower rigidity than the peripheral part of the first flange 14 and the peripheral part of the second flange 15.

  By the way, the cylinder head 3 and the cylinder block 2 may be thermally expanded due to heat generation in the internal combustion engine 1, or the cylinder block 2 and the cylinder head 3 may be contracted due to cooling of the internal combustion engine 1 when the engine is stopped. . At this time, if the deformation amount of the cylinder block 2 and the deformation amount of the cylinder head 3 are different from each other, a portion where the first flange 14 faces and a portion where the second flange 15 faces are It is assumed that the positional relationship is shifted.

  In the present embodiment, the intermediate portion 11M is deformed, so that it is easy to cope with a positional shift between the portion of the internal combustion engine 1 facing the first flange 14 and the portion facing the second flange 15. . As a result, it is possible to prevent the first flange 14 from separating from the cylinder head 3 and the second flange 15 from separating from the cylinder block 2, thereby ensuring the sealing performance.

  On the other hand, if vibrations caused by engine operation are transmitted to the first cover 10 without taking any measures, the intermediate portion 11M having lower rigidity than the periphery of the first flange 14 and the periphery of the second flange 15 vibrates. , Noise may occur.

  In this respect, in this embodiment, the rigidity of the intermediate portion 11M is increased by providing the cover side ribs 16a and 16b in the intermediate portion 11M. Therefore, even if vibrations from the cylinder block 2 and the cylinder head 3 are transmitted to the first cover 10 via the first flange 14 and the second flange 15, the vibration of the intermediate portion 11M can be suppressed. Thereby, generation | occurrence | production of the noise in the internal combustion engine 1 can be suppressed.

  Furthermore, in the present embodiment, the liquid gasket 16a1 is interposed between the cover-side rib 16a and the cylinder block 2, and the liquid gasket 16b1 is also interposed between the cover-side rib 16b and the cylinder block 2. For this reason, since the vibration of the intermediate part 11M of the first cover 10 can be attenuated by the elastic deformation of the liquid gaskets 16a1 and 16b1, the effect of suppressing the generation of noise due to the vibration of the intermediate part 11M can be enhanced. .

  The second cover 30 is also bonded to the first cover 10 with a liquid gasket and bolted. At this time, the liquid gasket is arranged in an environment where oil is supplied, but moisture in the atmosphere is supplied to the liquid gasket using a communication hole through which the fastening bolt is inserted. Thereby, after the first cover 10 and the second cover 30 are assembled, the liquid gasket is quickly cured to obtain an adhesive force. Thereby, generation | occurrence | production of the vibration of the 2nd cover 30 and noise can be suppressed.

  The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited to these. Various modifications of these embodiments are within the scope of the present invention, and It is apparent from the above description that various other embodiments are possible within the scope.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Cylinder block 3 Cylinder head 6 Timing chain 7 Timing chain storage case 10 1st cover 14 1st flange 15 2nd flange 16a, 16b Cover side rib 18 3rd flange 19 1st boss | hub 19b, 20b, 21b, 22b 23b Screw hole 20 2nd boss 21 3rd boss 22 4th boss 23 5th boss 30 2nd cover 31 Cover side wall 311 1st cover opposing surface 312 Outer wall surface 35 4th flange 36 6th boss 36b, 37b, 38b, 39b, 40b Communication hole 37 7th boss 38 8th boss 39 9th boss 40 10th boss 41 Bolt 41a Bolt head 41b Bolt shaft portion 42 Liquid gasket

Claims (1)

A first member mounted on the internal combustion engine;
A second member combined with the first member so as to face the first member;
A boss on the first member side formed by projecting toward the second member on the surface of the first member facing the second member;
A boss on the second member side formed to protrude toward the first member on the surface of the second member facing the first member;
A liquid gasket interposed between the boss on the first member side and the boss on the second member side,
The boss on the first member side is provided with a screw hole, and the boss on the second member side reaches the liquid gasket from the outer wall surface of the second member, and is connected to the fastening bolt that is tightened in the screw hole. Internal combustion engine with holes.

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