JP2004068822A - Mounting structure of case member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a case member capable of reducing the number of parts and assembling man-hours, having large freedom to set a shape and size of a projected part connected to an equipment main body or the case member and capable of forming the projected part in an effective position from a viewpoint of oscillation/noise restraint. <P>SOLUTION: An outer peripheral part of a timing cover is fastened on points 2, 3, 4 of an internal combustion engine main body with a plurality of bolts. A cam chain 10 is arranged in a space formed between the points 2, 3, 4 of the internal combustion engine main body and the timing cover. A projected part formed on an inner wall surface at a central part of the timing cover and projected parts 40a-40d formed on the internal combustion engine main body 2 are integrally connected to each other only by a liquid sealing member. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention is directed to an attachment structure for securely attaching a case member covering a portion exposed from the device main body to the device main body, and in particular, a case member covering the portion exposed from the internal combustion engine body and covering a portion where a power transmission mechanism and the like are arranged. It relates to the mounting structure.

As shown in Patent Document 1, a cam chain case that covers a valve operating mechanism disposed at an end of a crankshaft of an internal combustion engine is detachably integrated with a body of the internal combustion engine with bolts at a plurality of outer peripheral portions. Had been fitted.
JP-A-7-83069

Further, the central portion of the cam chain case described in Patent Document 1 is easily elastically deformed in a direction orthogonal to the case flat portion, and particularly in the central portion of the cam chain case through which the shaft portion of the water pump at the end face of the internal combustion engine passes. Since the rigidity of the peripheral portion of the through hole was low, the center portion of the cam chain case was liable to vibrate.

In order to prevent this, a plurality of bolt bosses are formed in the cam chain case so as to surround the through holes, and bolts that pass through the bolt bosses and are screwed and tightened to the internal combustion engine body are provided. The central portion of the cam chain case is integrally connected to the main body of the internal combustion engine, so that the vibration of the central portion is suppressed.

In the structure in which the cam chain case is attached to the internal combustion engine main body, it is necessary to form a large number of bolt bosses in the central portion and the opening of the cam chain case, and in addition to requiring a large number of bolts, the number of parts is increased, In addition, the number of steps for screwing and tightening the bolt is increased, and it has been difficult to reduce cost and weight.

The present invention relates to a mounting structure for a case member which overcomes such difficulties. The invention according to claim 1 is directed to an inner wall surface at a central portion of a case member whose outer peripheral portion is fastened to an apparatus main body by a plurality of fastening means. At least one protruding portion that is in contact with the device main body is formed, or at least one protruding portion that is in contact with an inner wall surface at a central portion of the case member is formed on the device main body; The protruding portion and the device main body or the case member are integrally connected only by a liquid seal member.

Since the invention according to claim 1 is configured as described above, the outer peripheral portion of the case member is firmly fastened by a plurality of fastening means, and at least the central portion of the case member protrudes from the inner wall surface. One protruding portion is in contact with the device main body via the liquid sealing member, or at least one protruding portion protruding from the device main body is formed on the inner wall surface at the central portion of the case main body via only the liquid sealing member. As the liquid seal member is abutted and hardens, the projecting portion of the case member or the device main body is firmly and integrally connected to the device main body or the case member only by the liquid seal member.

According to a second aspect of the present invention, in the mounting structure of the case member according to the first aspect, the device main body is an internal combustion engine main body, and an endless space is formed in a space formed between the internal combustion engine main body and the case member. A belt-shaped power transmission mechanism is arranged, and the protruding portion is provided in a space surrounded by the power transmission mechanism.

According to a third aspect of the present invention, in the mounting structure of the case member according to the first or second aspect, the case-side protruding portion, which is the protruding portion formed on the case member, also functions as an elongated rib. Or formed integrally with a rib formed on the inner wall surface of the case member.

According to the invention as set forth in claim 1, the liquid sealing member is not used, and the projecting portion is formed on the plane portion of the case member as compared with the case where the projecting portion is merely in contact with the device main body or the case main body. On the other hand, the bending stiffness in the direction orthogonal to the direction is significantly increased, and the case member is less likely to cause vibration.

Moreover, since there is no need for a fastening means for connecting the projecting portion of the case member to the device main body, the number of parts is reduced and the number of assembling steps is reduced, so that a large cost reduction and weight reduction can be achieved. Become.

Unlike the conventional bolt boss of the related art, in which a hole through which the bolt penetrates or screws is formed, and thus has a larger diameter than the maximum outer diameter of the bolt, the protrusion is a space formed by the case member and the device body. Even if there is no room for the space due to the members arranged inside, since there is a large degree of freedom in setting the shape and size, for example, it is possible to form a rib-shaped elongated shape according to the space, Since there is little restriction on the disposition position of the portion and the protrusion can be formed at an effective position from the viewpoint of suppressing vibration and noise, noise due to vibration is effectively reduced.

According to the second aspect of the present invention, since the protrusion of the internal combustion engine case member is provided in the space surrounded by the endless belt-shaped power transmission mechanism, it does not adversely affect the operation of the power transmission mechanism. , And can be provided using a dead space.

According to the third aspect of the invention, the case-side protruding portion is integrally connected to the internal combustion engine body by the liquid seal member and also functions as a reinforcing rib, so that the vibration of the case member is effectively suppressed. . Or, since the rib formed on the case member is integrally connected to the device main body or the internal combustion engine main body via the case-side protruding portion integrally connected to the device main body or the internal combustion engine main body by the liquid seal member, Vibration of the case member is effectively suppressed.

Hereinafter, embodiments of the present invention illustrated in FIGS. 1 to 9 will be described.
First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. An internal combustion engine 1 is a DOHC (double overhead camshaft) type in-line four-cylinder four-stroke cycle internal combustion engine mounted on an automobile. The main body of the internal combustion engine 1 includes a cylinder block 2, a cylinder head 3 disposed above the cylinder block 2, and a crankcase 4 disposed below the cylinder block 2. The cylinder block 2, the cylinder head 3, and the crankcase 4 are integrally connected to each other by a nut screwed to a bolt or a stud bolt (not shown). A timing cover 5 which is a case member of the internal combustion engine will be described later on the surface illustrated in FIG. 2). Sea urchin, detachably adapted to be mounted together.

A crankshaft 6 is rotatably supported on the mating surface between the cylinder block 2 and the crankcase 4, and a piston (not shown) is slidably fitted on a cylinder (not shown) formed on the cylinder head 3. The piston and the crankshaft 6 are connected via a connecting rod (not shown). As the piston is reciprocated by the combustion gas generated in the combustion chamber of the cylinder, the crankshaft 6 Are driven to rotate clockwise in FIG.

Further, the cylinder head 3 is formed with an intake / exhaust port (not shown) communicating with the cylinder top of the cylinder block 2 and an intake / exhaust valve (not shown) for communicating or shutting off the intake / exhaust port. An intake / exhaust cam shaft 7 integral with an intake / exhaust cam for opening and closing the intake / exhaust valve is rotatably supported by the cylinder head 3, and a cam chain driven sprocket 8 is integrally fitted to the intake / exhaust cam shaft 7, Outside the cylinder block 2, an endless cam chain 10 as a power transmission mechanism is bridged over a cam chain drive sprocket 9 and the cam chain driven sprocket 8 integral with the crankshaft 6. A chain guide 11 is provided on one side (the right side in FIG. 2), and a chain tension is provided on the other side of the cam chain 10. The chain tensioner 12 is provided with a chain guide member 13 having an upper end pivotally attached to the cylinder head 3 and a lower portion of the chain guide member 13 pressed against the cam chain 10 to apply tension to the cam chain 10. And a lifter 14 attached to the cylinder block 2 so that the cam chain 10 rotates one time corresponding to two rotations of the crankshaft 6 while the cam chain 10 is tensioned without loosening. It is designed to rotate smoothly at a certain rate.

Further, a lubricating oil pump 15 is integrally provided on the lower surface of the cylinder block 2, and is endlessly connected to a pump drive sprocket 16 integrated with the crankshaft 6 and a pump driven sprocket 18 integrated with the lubricating oil pump 15 and the pump rotating shaft 17. A chain 19 is bridged, a chain guide 20 is provided on the other side of the chain 19 (the left side in FIG. 2), and a chain tensioner 21 is provided on one side of the chain 19. The tension is applied to the chain 19 by the elastic restoring force of the main body itself.

The upper portion of the cylinder block 2 is covered and sealed by a cylinder head cover 22, and the lower portion of the cylinder block 2 is covered by an oil pan 23. Lubricating oil in the internal combustion engine 1 is stored in the oil pan 23. It has become so.

As shown in FIG. 3, an opening through which a crankshaft 6 can penetrate is provided below a timing cover 5 which seals one end surface of a main body of the internal combustion engine 1 including a cylinder block 2, a cylinder head 3 and a crankcase 4. 24 is formed, and an opening 25 for checking and replacing the variable valve timing solenoid of the valve operating system is formed in the upper part of the timing cover 5, and a lifter 14 of the chain tensioner 12 is formed in the opening 25. A maintenance opening 26 is formed at a corresponding location, and a lid 27 that seals an opening of a lubricating oil passage (not shown) of the cylinder block 2 is formed above the maintenance opening 26. Reference numeral 60 denotes a drive pulley for driving auxiliary equipment such as a generator and a water pump.

In the timing cover 5, a short cylindrical sensor fitting portion 29 that fits and supports a rotation detection sensor 28 that detects rotation of the crankshaft 6 from below the maintenance opening 26 toward the center of the opening 24. Is formed at a portion 29b near the opening 24 from the sensor fitting portion 29, and the inner surface thereof is formed to have a substantially semi-columnar shape, and the opening is formed with the sensor fitting portion 29 as a boundary. At a position 29a away from the opening 24, the outer surface thereof is formed in a substantially semi-columnar shape, and a mounting screw hole 30 is formed adjacent to the sensor fitting portion 29. The rotation detecting sensor 28 is inserted into the sensor fitting portion 29 from the lower position toward the center of the opening 24, and a screw 30a penetrating the base of the rotation detecting sensor 28 is screwed and tightened into the mounting screw hole 30 to detect rotation. The sensor 28 is mounted on the timing cover 5.

Further, as shown in FIG. 2, a large number of screw holes 31 for mounting the timing cover 5 are provided on both side edges forming the outer peripheral portions of the cylinder block 2, the cylinder head 3, and the crankcase 4. At both side edges forming the outer peripheral portion of the cover 5, mounting holes 33 are provided at boss portions 32 corresponding to the respective screw holes 31. The mounting holes 33 pass through the mounting holes 33 and are screwed into the screw holes 31. The timing cover 5 is removably attached to the cylinder block 2, the cylinder head 3, and the crankcase 4, which are the main body of the internal combustion engine 1, by bolts 34, which are fastening means.

Further, referring to FIGS. 3 and 4, an outer rib 35 that connects the adjacent bosses 32 in a straight line is formed on the upper portion of the outer surface of the timing cover 5, and the inner wall surface of the timing cover 5 has a cylinder. An inner rib 36 is formed from the boss 32 located on one side of the block 2, cylinder head 3 and crankcase 4 to the boss 32 located on the other side of the cylinder block 2, cylinder head 3 and crankcase 4. At the same time, a curved rib 37 is formed along the chain guide member 13 of the chain tensioner 12, and in a portion surrounded by the inner rib 36 and the curved rib 37, as shown in FIG. A concave portion 38 depressed inward and a convex portion 39 protruded outward are formed.

As shown in FIG. 2, the outer wall surface of the cylinder block 2 has four cross-hatched portions (where the function of the power transmission mechanism of the valve train is not impaired). Projections 40a, 40b, 40c, and 40d are formed on the inner wall surface of the timing cover 5, and are provided on the outer wall surface of the cylinder block 2 as shown in FIG. At four positions corresponding to the projected portions 40a to 40d, projecting portions 41a, 41b, 41c, and 41d, which are cross-hatched case-side projecting portions, are formed. When mounted on the cylinder head 3 and the crankcase 4, the contact surfaces B1, B2, B3, B4, which are the tip surfaces of the projections 40a to 40d, and the contact surfaces, which are the tip surfaces of the projections 41a to 41d. Liquid seal member for C1, C2, C3, C4, for example IPG (Formed In Place Gasket) 44 (see FIG. 6) is adapted to be applied. The FIPG 44 is made of, for example, a room-temperature-curable silicone rubber-based liquid sealing material.

Further, a plurality of side edges 42 provided on both side edges of the cylinder block 2, the cylinder head 3 and the crankcase 4 and connecting a number of bosses having screw holes 31 and a plurality of side edges provided on both side edges of the timing cover 5. The FIPG 44 is also applied to the side edge portion 43 connecting the boss portions 32 when the timing cover 5 is attached.

Further, as shown in FIG. 6, the contact surfaces B1 to B4 of the protruding portions 40a to 40d of the cylinder block 2 and the contact surfaces of the side edges 42 of the cylinder block 2, the cylinder head 3 and the crankcase 4. Are formed so as to be located on the same plane, and the contact surfaces C1 to C4 of the protrusions 41a to 41d of the timing cover 5 and the contact surface of the side edge 43 of the timing cover 5 are the same. It is formed so as to be located on a plane.

The protruding portions 40a, 40b and the protruding portions 41a, 41b are arranged with respect to the rotation axis of the crankshaft 6 from a position near the crankshaft 6 and adjacent to the outer periphery of the pump drive sprocket 16 having a larger diameter than the cam chain drive sprocket 9. And a rib-shaped protrusion having a contact surface having an elongated shape. With this shape, the protrusions 41a and 41b also function as reinforcing ribs of the timing cover 5, so that the vibration of the timing cover 5 around the crankshaft 6 due to the vibration of the crankshaft 6 in the rotation axis direction is effectively suppressed. Is done.

Since the first embodiment shown in FIGS. 1 to 6 is configured as described above, the FIPG 44 made of a room-temperature-curable silicone rubber-based liquid sealing material is brought into contact with the projections 40 a to 40 d of the cylinder block 2. The FIPG 44 is applied to the surfaces B1 to B4 and the contact surfaces C1 to C4 of the protrusions 41a to 41d of the timing cover 5, and the FIPG 44 is applied to the side edges 42 of the cylinder block 2, the cylinder head 3 and the crankcase 4, and the timing cover 5 Is applied to the contact surface of the side edge 43 of the timing cover 5, the side edge 43 of the timing cover 5 is applied to the side edge 42 of the cylinder block 2, the cylinder head 3, and the crankcase 4. Is screwed into the screw holes 31 of the cylinder block 2, the cylinder head 3, and the crankcase 4, and the timing cover 5 is attached to the internal combustion engine 1. It can be attached to one end surface of the cylinder block 2, the cylinder head 3, and the crankcase 4 as the main body. Therefore, the contact surfaces of the side edge portions 42 and the side edge portions 43 both form fastening surfaces.

As the FIPG 44 reacts with moisture in the air and hardens, the side edge 43 of the timing cover 5 is integrally connected to the cylinder block 2, the cylinder head 3 and the side edge 42 of the crankcase 4. In addition, since the projections 41a to 41d of the timing cover 5 are integrally connected to the projections 40a to 40d of the cylinder block 2, the cylinder head 3, and the crankcase 4, both rigidities of the timing cover 5 are significantly increased. In addition, the timing cover 5 is less likely to vibrate due to an exciting force orthogonal to the plane portion.

For this reason, even if a large vibration is generated in the cam chain 10 circulated between the cylinder block 2, the cylinder head 3, and the crankcase 4 and the timing cover 5, the timing cover 5 does not generate a large elastic deformation and the noise is reduced. Is also unlikely to occur.

The space surrounded by the cylinder block 2, the cylinder head 3, the crankcase 4, and the timing cover 5, which is the main body of the internal combustion engine 1, is defined by the side edges 42 of the cylinder block 2, the cylinder head 3, and the crankcase 4, and the timing cover 5. Since the cylinder head cover 22 and the oil pan 23 are in close contact with the FIPG 44 interposed between the cylinder head cover 5 and the side edge 43, and the upper and lower end surfaces of the timing cover 5 are in close contact with each other, Noise is less likely to leak outside.

Further, the contact surfaces B1 to B4 of the protrusions 40a to 40d of the cylinder block 2 and the contact surfaces of the side edges 42 of the cylinder block 2, the cylinder head 3 and the crankcase 4 are located on the same plane. The contact surfaces C1 to C4 of the protrusions 41a to 41d of the timing cover 5 and the contact surface of the side edge 43 of the timing cover 5 are formed so as to be located on the same plane. Therefore, the processing of the contact surfaces of the protruding portions 40a to 40d, the side edge portions 42 and the protruding portions 41a to 41d, and the side edge portions 43 becomes extremely simple, and the productivity is high.

Furthermore, even if the distance between the outer wall surface of the cylinder block 2 and the inner wall surface of the timing cover 5 is large, a projecting portion that protrudes from the inner wall surface of the timing cover 5 at a location requiring reinforcement at the center of the timing cover 5. Four projections 41a to 41d are formed, and the contact surfaces C1 to C4 of the projections 41a to 41d are brought into contact with the projections 40a to 40d projecting from the outer wall surface of the cylinder block 2 by the FIPG 44 of the hardened liquid sealing member. Since the timing cover 5 is strongly connected to the surfaces B1 to B4, the rigidity and strength of the timing cover 5 are significantly increased, and the vibration resistance and the noise insulation are greatly improved.

Although the projections 41a to 41c of the timing cover 5 are provided at positions not related to the inner rib 36 of the timing cover 5, the inner rib 36 is connected to the cylinder block 2 at a position where the function of the power transmission mechanism is not impaired. And the inner rib 36 may be integrally joined to the corresponding rib-shaped projection of the cylinder block 2 via the FIPG 44. With such a configuration, the joining area of the FIPG 44 can be increased. Thus, the central portion of the timing cover 5 can be more firmly connected to the cylinder block 2.

Further, the projections 40a to 40d of the cylinder block 2 and the projections 41a to 41d of the timing cover 5 do not need to be formed as bosses for screwing the bolts, that is, the bolts penetrate or screw. Since the holes are formed, the projections 40a to 40d and the projections 41a to 41d are different from the boss portion of the prior art described above in which the diameter is larger than the maximum outer diameter of the bolt. The cam chain 10, cam chain drive sprocket 9, pump drive sprocket 16, chain 19 and chain tensioner 12 which are arranged in the space formed by the case 4 and the timing cover 5 can be used even when there is not enough space. , Its shape and size etc. can be made into a rib-like elongated shape according to its space Since the degree of freedom of setting is large, there are few restrictions on the arrangement positions of the protruding portions 40a to 40d and the protruding portions 41a to 41d, and the protruding portions 40a to 40d and the protruding portions 41a to 41 Since 41d can be formed, noise can be more effectively shut off and vibration of the timing cover 5 can be suppressed at a position where the function of the power transmission mechanism of the valve train is not impaired.

Furthermore, the protrusions 40a to 40d of the cylinder block 2 and the protrusions 41a to 41d of the timing cover 5 can be formed in a boss shape as required.

Moreover, the protrusions 40a to 40d of the cylinder block 2 or the protrusions 41a to 41d of the timing cover 5 are preferably formed on the same plane as the side edge 42 of the cylinder block 2 or the side edge 43 of the timing cover 5, respectively. Although it is advantageous in terms of workability, by setting the protrusions 41a to 41d of the timing cover 5 to be slightly longer than the side edges 43 of the timing cover 5, the timing cover 5 can be easily fastened to the cylinder block 2. The joining between the protrusions 40a to 40d of the cylinder block 2 and the protrusions 41a to 41d of the timing cover 5 can be further strengthened.

Further, since the protruding portion 41c is formed in the concave portion 38 (see FIG. 6) of the timing cover 5, the length of the protruding portion 41c can be shortened to facilitate processing. The protruding portion 40c of the block 2 can be accurately contacted. This is particularly effective in a structure in which the protrusions 40a to 40d and the protrusions 41a to 41d are provided on the cylinder block 2, the cylinder head 3, and the timing cover 5, respectively.

Further, the projection 41d of the timing cover 5 is formed integrally with the rib 36 provided on the inner wall surface of the timing cover 5 as shown in FIG. As a result, the vibration reduction effect of the timing cover 5 is greatly improved.

Furthermore, since the protruding portions 41a and 41c of the timing cover 5 are provided in a space surrounded by the cam chain 10 which is an endless power transmission mechanism, the operation of the cam chain 10 is not adversely affected, and It can be provided near the drive unit by utilizing the dead space.

Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment differs from the first embodiment mainly in the projection 40a and the projection 41a, and has basically the same configuration except for the above. Therefore, the description of the same parts as those of the first embodiment is omitted or simplified, and the same reference numerals are used for the same members as those of the first embodiment.

In the second embodiment, as will be described later, the projecting portion 50 that is the main body-side projecting portion and the projecting portion 51 that is the case-side projecting portion respectively correspond to the projecting portions 40a and 41a of the first embodiment. Since it has the passages 52 and 53, it is formed as a projection with an oil passage. Each of the protrusions 50, 51 has a columnar portion 50a, 51a having a substantially circular cross-sectional shape, and rib-like portions 50b, 51b extending radially outward from the outer peripheral surface of the columnar portion toward the cylinder head 3 side. Consists of

One end of the protruding portion 50 forms an opening 52a that opens to a contact surface B5 with the protruding portion 51, and the other end has a semicircular bearing hole for supporting a main bearing 55 formed in the cylinder block 2. An oil passage 52, which is a main body-side oil passage, is formed which is connected to an arc-shaped supply passage 54 formed by a circumferential groove formed on the peripheral wall surface and extending in the circumferential direction. The supply passage 54 supplies lubricating oil between the end journal 6 a of the crankshaft 6 and the main bearing 55 supported by the cylinder block 2 and the bearing cap 56, and supplies a main gallery (formed in the cylinder block 2). (Not shown).

On the other hand, in the protruding portion 51, one end constitutes an opening 53a that opens to the contact surface C5 with the protruding portion 50, and is connected to the oil passage 52 at the contact surface B5, and the other end of the protruding portion 51 An oil passage 53, which is a case-side oil passage that becomes a closed portion 53b closed at the base end, is formed. Therefore, the oil passage 53 is an oil passage communicating with the supply passage 54 via the oil passage 52. In addition, the lubricating oil is supplied to the protruding portion 51 from the vicinity of the closed portion 53b of the oil passage 53 so as to supply the cam chain 10 and the cam chain drive sprocket 9 with lubricating oil. An injection hole 57 for injecting lubricating oil is formed to face the cam chain 10 and the cam chain drive sprocket 9 (in the direction of the arrow in the figure). Therefore, the protrusion 51 is a refueling protrusion in which the oil passage 53 and the injection hole 57 are formed.

Since the injected lubricating oil has the injection holes 57 formed so as to have a component in a direction toward the cylinder block 2, a part of the injected lubricating oil is adjacent to the cam chain drive sprocket 9. , And is also supplied to the pump drive sprocket 16 and the chain 19 arranged near the cylinder block 2.

The FIPG 44 is applied to the contact surfaces B5 and C5 of the projecting portions 50 and 51, and the contact surfaces B5 and C5 around the openings 52a and 53a of the oil passages 52 and 53 in the columnar portions 50a and 51a. C5 is applied over the entire circumference, but is applied in such a manner that the FIPG 44 does not enter the oil passages 52, 53 as much as possible when the projections 50, 51 abut.

As described above, the oil passages 52 and 53 leading to the lubricating oil supply passage 54 are formed in the protrusion 50 and the protrusion 51 connected by the FIPG 44, and the lubricating oil in the oil passage 53 is further supplied to the protrusion 51 by the cam chain. According to the second embodiment in which the oil supply device for the cam chain 10 and the cam chain drive sprocket 9 is formed by forming the injection hole 57 that injects the oil toward the cam chain 10 and the cam chain drive sprocket 9, the first embodiment The same operation and effect as those described above are obtained, and the following operation and effect are obtained.

The lubricating oil discharged from the lubricating oil pump 15 and supplied to the supply path 54 via the main gallery is supplied to the oil path 53 via the oil path 52, and the cam chain 10 and cam Injection is directed toward the chain drive sprocket 9. The oil film formed by the injected lubricating oil adhering to the cam chain 10 and the cam chain drive sprocket 9 reduces the meshing sound which is the contact sound between the cam chain 10 and the cam chain drive sprocket 9. Due to the oil film formed by the injected lubricating oil adhering to the chain 19 and the pump drive sprocket 16, the meshing noise between the chain 19 and the pump drive sprocket 16 is reduced, and the noise is reduced.

In addition, since the injection hole 57 is formed in the protruding portion 51 that joins the timing cover 5 and the cylinder block 2 in order to suppress the vibration of the timing cover 5, a special projection for forming the injection hole 57 is provided. Since a large space is not required unlike the case where a separate portion is formed, both the viewpoint of suppressing the vibration of the timing cover 5 and lubricating the cam chain 10 as in the vicinity of the cam chain drive sprocket 9 around which the cam chain 10 is wound. Therefore, even when it is preferable that the protruding portions 51 and the injection holes 57 are disposed close to each other, they can be formed at appropriate positions.

Further, since the projection 51 couples the timing cover 5 and the cylinder block 2 by being coupled with the projection 50, the projection 51 is provided in a space formed between the timing cover 5 and the cylinder block 2. In the projecting direction, the range of the formation position of the injection hole 57 near the timing cover 5 can be easily expanded, and the cam chain 10 and the cam chain drive sprocket 9 near the formation position of the injection hole 57 and the timing cover 5 can be easily obtained. , The degree of freedom in setting the lubricating oil injection direction is increased.

Further, although the oil passage 52 and the oil passage 53 are connected at the contact surfaces B5 and C5, the contact surfaces B5 and C5 are provided around the openings 52a and 53a of the oil passages 52 and 53. Since there is a FIPG 44 connecting the protrusions 50 and 51 over the entire circumference, the leakage of the lubricating oil from the connection between the oil passages 52 and 53 can be achieved without separately providing a sealing member such as an O-ring. Can be prevented.

In the above embodiments, the present invention is applied to the timing cover 5 that covers the power transmission mechanism of the valve train, but may be applied to the cylinder head cover 22 or the oil pan 23 instead of the timing cover 5.

The cylinder block 2 that constitutes the main body of the internal combustion engine 1 is provided with four projections 40a to 40d, and the timing cover 5 is provided with four projections 40a to 40d. And at least one timing cover 5 may be provided.

Further, the protrusion may be provided on only one of the main body of the internal combustion engine 1 and the timing cover 5, and the protrusion may be coupled to the other of the main body of the internal combustion engine 1 and the other of the timing cover 5 by the FIPG 44. . Further, at least one of the protrusions can be a lubrication protrusion, in which case, in the space between the main body of the internal combustion engine 1 and the timing cover 5, the protrusion has a full width in the protrusion direction. Since the position of the injection hole 57 can be set within the range, the degree of freedom in setting the formation position of the injection hole 57 and, consequently, the injection direction of the lubricating oil to the cam chain 10 is increased, and the distance between the injection hole 57 and the cam chain 10 is increased. Therefore, the injection hole 57 can be formed at a position where the oil supply to the cam chain 10 is optimal, such as by forming the injection hole 57 at a position avoiding a member that hinders oil supply to the cam chain 10.

Further, in the first embodiment, the case member is the timing cover 5 of the internal combustion engine 1, but may be a device other than the internal combustion engine 1, in which case the case member is fastened to the main body of the device. You.

In the second embodiment, the protrusion with an oil passage is one of a plurality of protrusions 40 a to 40 c and 50 formed on the cylinder block 2 and a plurality of protrusions 41 a to 41 c and 51 formed on the timing cover 5. Each of the projections 50 and 51 was a single projection, but if necessary, a plurality of the projections 40a to 40c and 50 were made to be projections with an oil passage, and a plurality of the projections 41a to 41c and 51 were made to have an oil passage. It is good also as a projection part and a lubrication projection part. Further, by forming an injection hole in the projecting portion 50 to function as a lubricating projecting portion, the lubricant oil is injected from the injection hole 57 of the projecting portion 51, and the lubricating oil is supplied to the cam chain 10 and the cam chain drive sprocket 9. You may make it inject. In the space surrounded by the chain 19, a projection similar to the projection 50 is formed on the crankcase 4, and a projection similar to the projection 51 is formed on the timing cover 5. Lubricating oil may be injected into 19 and pump drive sprocket 16.

In the second embodiment, in order to reliably prevent the FIPG 44 from entering the oil passages 52 and 53, for example, each of the protrusions 50 and 51 may be formed in a shape as shown in FIG. . That is, the contact surface B5 of the protruding portion 50 has a stepped contact portion formed by forming a cylindrical convex portion 50a1 having an outer diameter smaller than the columnar portion 50a around the opening 52a in the columnar portion 50a. As a result, the contact surface B5 is located on the same plane as the contact surfaces of the side edges 42 of the cylinder block 2, the cylinder head 3, and the crankcase 4, and the FIPG 44 is applied. A first abutting surface B5a and a second abutting surface B5b of the protruding portion 50a1 which is a leading end surface parallel to the first abutting surface B5a and abuts against an abutting surface C5b of a concave portion 51a1 of the protruding portion 51 described later. Consists of

Further, the contact surface C5 of the protruding portion 51 has a larger diameter than the opening 53a around the opening 53a in the columnar portion 51a, and has a larger diameter than the outer diameter of the protruding portion 50a1 so that the protruding portion 50a1 is fitted. The concave portion 51a1 is formed by a bottomed circular hole having a slightly larger diameter to form a stepped contact surface, whereby the contact surface C5 is formed on the side edge portion 43 of the timing cover 5. A first contact surface C5a on which the FIPG 44 is applied and a bottom surface of the concave portion 51a1 parallel to the first contact surface C5a, It comprises a contact surface B5b and a second contact surface C5b that contacts.

Therefore, the openings 52a, 53a of the two oil passages 52, 53 have the second contact surfaces B5b located at positions different from the first contact surfaces B5a, C5a to which the FIPG 44 is applied in the center line direction of the columnar portion. , C5b, when the timing cover 5 is connected to the cylinder block 2, the cylinder head 3, and the crankcase 4, even if the first contact surfaces B5a and C5a contact, the first contact surfaces The FIPG 44 applied to B5a and C5a before being cured does not enter the oil passages 52 and 53 from the openings 52a and 53a. As described above, the protrusion 50a1 of the protrusion 50 and the recess 51a1 of the protrusion 51 constitute an intrusion prevention structure for preventing the FIPG 44, which is a liquid seal member, from entering the oil passages 52 and 53, respectively.

In each of the above embodiments, the power transmission mechanism is a valve transmission power transmission mechanism, but may be a drive transmission power transmission mechanism such as an auxiliary machine other than the valve transmission system. Although chains were used, gears or belts could be used instead of chains.

1 is a front view of an internal combustion engine including a case member mounting structure according to a first embodiment of the present invention. FIG. 2 is a front view showing a state where a timing cover is removed in FIG. 1. FIG. 4 is an external view of a timing cover. It is an inside view of a timing cover. FIG. 5 is a longitudinal sectional view cut along the line VV of FIG. 3. FIG. 6 is a transverse sectional view taken along the line VI-VI of FIG. 3. FIG. 6 is a front view of a main part when a timing cover is removed similarly to FIG. 2, showing the second embodiment of the present invention. FIG. 8 is a vertical sectional view taken along a line VIII-VIII in FIG. 7 with a timing cover attached. It is a principal part enlarged view of the protrusion part when the shape of the protrusion part of 2nd Embodiment is changed.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Cylinder block, 3 ... Cylinder head, 4 ... Crank case, 5 ... Timing cover, 6 ... Crank shaft, 7 ... Intake / exhaust cam shaft, 8 ... Cam chain driven sprocket, 9 ... Cam chain drive sprocket , 10 cam chain, 11 chain guide, 12 chain tensioner, 13 chain guide member, 14 lifter, 15 lubricating oil pump, 16 pump drive sprocket, 17 pump rotary shaft, 18 pump driven sprocket, 19… Chain, 20… Chain Guide, 21… Chain Tensioner, 22… Cylinder Head Cover, 23… Oil Pan, 24, 25… Opening, 26… Maintenance Opening, 27… Lid, 28… Rotation Detection Sensor, 29 ... Sensor fitting part, 30 ... Mounting screw hole, 31 ... Screw hole, 32 ... Boss part, 33 ... Mounting hole, 34 ... Bolt, 35 ... Outer rib, 36 ... Inner 37, curved ribs, 38, concave portions, 39, convex portions, 40a to 40d, 41a to 41d, projecting portions, 42, 43, side edge portions, 44, FIPG, 50, 51, projecting portions, 52, 53, Oil passage, 54 ... supply passage, 55 ... main bearing, 56 ... bearing cap, 57 ... injection hole, 60 ... drive pulley,
B1 to B5, C1 to C5 ... Contact surfaces.

Claims (3)

At least one protruding portion that is in contact with the device main body is formed on an inner wall surface at a central portion of a case member whose outer peripheral portion is fastened to the device main body by a plurality of fastening means. At least one protruding portion that is in contact with an inner wall surface at a central portion of the case member is formed, and the protruding portion and the device body or the case member are integrally connected only by a liquid seal member. The mounting structure of the case member. The device main body is an internal combustion engine main body, and an endless belt-shaped power transmission mechanism is disposed in a space formed between the internal combustion engine main body and the case member, and the projection is surrounded by the power transmission mechanism. The case member mounting structure according to claim 1, wherein the case member mounting structure is provided in a closed space. The case-side protrusion, which is the protrusion formed on the case member, is formed in an elongated rib shape that also functions as a reinforcing rib, or is formed integrally with a rib formed on an inner wall surface of the case member. The case member mounting structure according to claim 1 or 2, wherein

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