JP2002054454A - Mounting structure of case member and device for feeding oil to power transmission mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide mounting structure where an internal combustion engine case member to cover a part exposed from an internal combustion engine body is firmly mounted on the internal combustion engine body. SOLUTION: Protrusion parts 41a, 41b, 41c, and 41d making contact with the internal combustion engine body are formed on the inner wall surface of an internal combustion engine case member 5 having its outer peripheral part fastened against the internal combustion engine body by a plurality of fastening means. The protrusion parts 41a, 41b, 41c, and 41d and the internal combustion engine body are coupled together by liquid seal member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for securely mounting a case member covering a portion exposed from an apparatus main body to the apparatus main body, particularly, a part exposed from an internal combustion engine main body, in which a power transmission mechanism and the like are arranged. More specifically, the present invention relates to an oil supply device for supplying lubricating oil to a power transmission mechanism.

[0002]

2. Description of the Related Art A cam chain case for covering a valve operating mechanism disposed at an end of a crankshaft of an internal combustion engine is disclosed in Japanese Patent Laid-Open No. 7-83.
As disclosed in Japanese Patent Application Laid-Open No. 069, the bolt is detachably and integrally attached to the internal combustion engine main body at a plurality of outer peripheral portions thereof with bolts.

The center portion of the cam chain case described in the above publication is easily elastically deformed in a direction perpendicular to the plane portion of the case. In particular, the center 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 in the portion was low, the center portion of the cam chain case was likely to cause vibration.

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 the cam chain case is screwed and tightened to the internal combustion engine body through the bolt bosses. With a bolt, the cam chain case central portion is integrally connected to the internal combustion engine body,
The vibration at the center was suppressed.

Further, Japanese Utility Model Laid-Open No. 4-91210 discloses that
There is disclosed a lubricating device that is disposed in a space formed by a cam chain case and an internal combustion engine main body and supplies lubricating oil to a timing chain (cam chain) that transmits rotation of a crankshaft to a camshaft. In this lubrication device,
A projection is formed on an oil pump body attached to the cylinder block, and the projection is directed to an oil passage communicating with an oil passage in the cylinder block, and the oil from the oil passage is directed to a portion of the timing chain that requires lubrication. The oil jet hole which blows off was formed. The oil passage in the cylinder block and the oil passage in the projection are connected via hollow pins fitted into both oil passages when the oil pump body is connected to the cylinder block.

[0006]

In the structure in which the cam chain case is mounted on the internal combustion engine main body, it is necessary to form a large number of bolt bosses at the center and the opening of the cam chain case, and further, it is necessary to form a large number of bolts. Is required, the number of parts is increased, and the number of steps for screwing and tightening the bolt is increased, which makes it difficult to reduce cost and weight.

Further, the conventional timing chain lubricating apparatus requires a hollow pin, so that the number of parts is increased and the number of assembly steps is also increased. Further, since a projection having an oil passage and an oil jet hole is formed, a bolt boss portion through which a bolt penetrates or is screwed into the cam chain case or the internal combustion engine body to suppress vibration of the cam chain case as described above. Is formed, the projections are formed in addition to the bolt bosses. Therefore, for example, as in the vicinity of a sprocket around which a cam chain is wound, both aspects of suppressing the vibration of the cam chain case and lubricating the cam chain are provided. For this reason, when it is necessary to dispose them both close to each other, the arrangement is restricted, and it may be difficult to form a bolt boss or a protrusion at an appropriate position.

[0008]

SUMMARY OF THE INVENTION The present invention relates to an improvement in a structure for mounting a case member and an oil supply device for a power transmission mechanism which overcome the above-mentioned difficulties.
At least one protruding portion that is in contact with the device main body is formed on the inner wall surface of the case member whose outer peripheral portion is fastened to the device main body by a plurality of fastening means, or the device body has At least one protruding portion that is in contact with the inner wall surface is formed, and the protruding portion and the device body or the case member are connected by a liquid seal member.

According to the first aspect of the present invention, the outer peripheral portion of the case member is firmly fastened by a plurality of fastening means, and at least the projecting portion projects from the inner wall surface of the case member. One protruding portion is in contact with the device main body via the liquid sealing member, and as the liquid sealing member cures, the projecting portion of the case member or the device main body is firmly connected to the device main body or the case member. As a result, the bending rigidity of the case member in a direction perpendicular to the plane portion is significantly increased, and the case member is less likely to cause vibration.

[0010] Further, since fastening means for connecting the projecting portion of the case member to the device main body is not required or the number of parts as fastening means can be reduced, the number of parts can be reduced and assembly can be performed. The number of man-hours is also reduced, which enables a large cost reduction and weight reduction.

According to the second aspect of the present invention, the case-side projecting portion of the internal combustion engine case member is firmly connected to the internal combustion engine body in response to the hardening of the liquid seal member. The bending rigidity in the direction orthogonal to the plane portion of the internal combustion engine case member is significantly increased,
Vibration of the internal combustion engine case member is suppressed.

Further, according to the second aspect of the present invention, the bolt boss required for fastening the internal combustion engine case member to the internal combustion engine body with bolts is not required in a portion other than the outer peripheral portion of the internal combustion engine case member. , Or reduced, and does not require fastening means for connecting the protrusion of the internal combustion engine case member to the internal combustion engine body,
Or because the number of parts as fastening means can be reduced,
The number of parts is reduced and the number of assembly steps is reduced.
Large cost reduction and weight reduction are possible. Further, since a hole through which the bolt penetrates or screws is formed, unlike the conventional bolt boss portion having a diameter larger than the maximum outer diameter of the bolt, the protrusion is formed by the internal combustion engine case member and the internal combustion engine body. Even if there is no room for the space due to the members arranged in the space formed by the above, it is possible to set the shape and size, for example, such as a rib-shaped elongated shape according to the space, etc. Is large, there are few restrictions on the location of the protrusions, and the protrusions can be formed at effective positions from the viewpoint of suppressing vibration and noise.Therefore, noise due to vibration can be reduced without impairing the function of the internal combustion engine. Effectively reduce.

According to the present invention, even if the distance between the outer wall surface of the internal combustion engine main body and the inner wall surface of the internal combustion engine case member is large, the two protruding surfaces from the both wall surfaces are provided. A required portion of the internal combustion engine case member is firmly connected to the internal combustion engine main body with a projection and a hardened liquid sealing member interposed between the contact surfaces of the both projections, and Vibration is reliably suppressed.

Further, according to the third aspect of the present invention, a bolt boss required for fastening the internal combustion engine case member to the internal combustion engine body with bolts is not required in a portion other than the outer peripheral portion of the internal combustion engine case member. Or the number of the protrusions can be set freely, and the positions of the protrusions and the shapes of the protrusions can be freely set, and the noise due to vibration can be effectively reduced without impairing the function of the internal combustion engine. .

Further, in the invention according to the third aspect, since the contact surfaces of the two projecting portions are flush with the fastening surfaces of the internal combustion engine body and the internal combustion engine case member, the contact surfaces are fastened. Finishing of the surface is simplified and workability is greatly improved.

By configuring the invention as described in claim 4, the same functions and effects as those of the inventions of claims 1 and 2 are provided, and the following functions and effects are provided. That is, noise generated by the contact of the power transmission mechanism is reduced by the oil film formed by the lubricating oil injected from the injection hole of at least one lubricating projection attached to the power transmission mechanism. In addition, since the injection hole is formed in the lubrication projection that couples the internal combustion engine case member and the internal combustion engine body in order to suppress vibration of the internal combustion engine case member, a dedicated projection for forming the injection hole is provided. Does not require a large space as when separately formed, so from the viewpoints of both suppressing the vibration of the internal combustion engine case member and lubricating the power transmission mechanism, even when the protrusions and the injection holes are arranged close to each other. , They can be formed at appropriate locations. Furthermore, since the refueling projection connects the internal combustion engine case member and the internal combustion engine main body, the refueling projection has a width in the space between the internal combustion engine main body and the internal combustion engine case member over the entire width in the projection direction of the refueling projection. The position of the injection hole can be set by the nozzle, so the degree of freedom in setting the injection hole formation position and, consequently, the lubricating oil injection direction with respect to the power transmission mechanism is increased, and the power transmission is performed between the injection hole and the power transmission mechanism. The injection hole can be formed at a position where the oil supply to the power transmission mechanism is optimal, such as by forming the injection hole at a position avoiding a member obstructing the oil supply to the mechanism.

According to the fifth aspect of the present invention, since the injection hole is formed in the case-side projecting portion, the injection is made in the projecting direction of the case-side projecting portion and near the case member of the internal combustion engine. The range of the hole formation position can be easily expanded. Moreover, despite the fact that the main body side oil passage and the case side oil passage are connected at the contact surface, there is a liquid seal member connecting the case side protrusion and the body side protrusion on the corresponding contact surface. Without separately providing a seal member, it is possible to prevent leakage of lubricating oil from a connection portion between the main body side oil passage and the case side oil passage.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in FIGS. 1 to 9 will be described below.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. The internal combustion engine 1 is a DOHC (double overhead camshaft) type in-line four-cylinder four-stroke A cycle internal combustion engine, wherein a main body of the internal combustion engine 1 includes: a cylinder block 2;
It comprises a cylinder head 3 arranged above the cylinder block 2 and a crankcase 4 arranged below the cylinder block 2. The cylinder block 2, the cylinder head 3 and the crankcase 4 are provided with bolts or bolts (not shown). The cylinder block 2, the cylinder head 3, and the one end surface (the surface shown in FIG. 2) of the crankcase 4 are integrally connected to each other by a nut screwed to the stud bolt, and are internal combustion engine case members. The timing cover 5 is detachably and integrally attached as described later.

A crank shaft 6 is rotatably supported on the mating surface of the cylinder block 2 and the crank case 4, and a piston (not shown) slides on a cylinder (not shown) formed in the cylinder head 3. The piston and the crankshaft 6 are freely fitted, and 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 is driven to rotate clockwise in FIG.

Further, the cylinder head 3 is formed with an intake / exhaust port (not shown) communicating with the top of the cylinder of the cylinder block 2 and an intake / exhaust valve (not shown) for communicating or shutting off the intake / exhaust port. And
An intake / exhaust cam shaft 7 integrated 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 attached to the intake / exhaust cam shaft 7.
The cam chain drive sprocket 9 and the cam chain driven sprocket 8 integral with the crankshaft 6 are fitted outside the cylinder block 2 to form an endless cam chain as a power transmission mechanism.
10 is bridged, and one side of the cam chain 10 (right side in FIG. 2)
A chain tensioner 12 is provided on the other side of the cam chain 10. The chain tensioner 12 includes a chain guide member 13 having an upper end pivotally mounted on the cylinder head 3, and a chain guide member 13. 13 comprises a lifter 14 attached to the cylinder block 2 so as to press the lower portion of the cam 13 toward the cam chain 10 to apply tension to the cam chain 10. The cam chain 10 is tensioned without loosening. The intake and exhaust camshaft 7 is smoothly rotated at a rate of one rotation in response to two rotations of the shaft 6.

Further, a lubricating oil pump 15 is integrally provided on the lower surface of the cylinder block 2 to
And a pump driven sprocket 18 integral with the lubricating oil pump 15, the pump rotating shaft 17 and the pump drive sprocket 18.
A chain guide 20 is provided on the other side (the left side in FIG. 2) of the chain 19, and a chain tensioner 21 is provided on one side of the chain 19. Tension is applied.

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 so that the lubricating oil in the internal combustion engine 1 is supplied to the oil pan 23. Are stored.

As shown in FIG. 3, a crankshaft 6 passes through a lower portion of a timing cover 5 that 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. The opening 25 is formed at the top of the timing cover 5 for checking and replacing the variable valve timing solenoid of the valve operating system.
A maintenance opening 26 is formed at a position corresponding to the lifter 14 of the chain tensioner 12, and a lubricating oil passage (not shown) of the cylinder block 2 is provided above the maintenance opening 26.
A lid 27 is formed to seal the opening. 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 for fitting and supporting a rotation detection sensor 28 for detecting rotation of the crankshaft 6 is formed from below the maintenance opening portion 26 toward the center of the opening portion 24. At a portion 29b near the opening 24 from the portion 29, the inner surface of the portion 29b protrudes outward and is formed in a substantially semi-cylindrical shape, and at a portion 29a separated from the opening 24 with the sensor fitting portion 29 as a boundary, the inside is The outer surface is formed in a substantially semi-columnar shape, and a mounting screw hole 30 is formed adjacent to the sensor fitting portion 29, and the center of the opening 24 is positioned from a position below the maintenance opening 26. The rotation detection sensor 28 is inserted into the sensor fitting portion 29 facing
A screw 30a penetrating the base of the rotation detection sensor 28 is screwed and tightened into a mounting screw hole 30, so that the rotation detection sensor 28 is mounted on the timing cover 5.

Further, as shown in FIG. 2, a timing cover 5 is provided on both side edges forming the outer peripheral portions of the cylinder block 2, the cylinder head 3 and the crankcase 4.
There are provided a large number of screw holes 31 for attaching the screw holes.
A mounting hole 33 is provided in the boss 32 corresponding to
The timing cover 5 is detachably 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 serving as fastening means that pass through the mounting holes 33 and are screwed into the screw holes 31. It has become.

Referring to FIGS. 3 and 4, an outer rib 35 is formed on the outer surface of the timing cover 5 to connect the adjacent bosses 32 linearly. An inner rib 36 is formed to connect the boss 32 located on one side of the cylinder block 2, the cylinder head 3 and the crankcase 4 to the boss 32 located on the other side of the cylinder block 2, the cylinder head 3 and the crankcase 4. In addition, 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. 5 are formed with concave portions 38 depressed inward and convex portions 39 protruded outward.

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). , The protruding portion 40 which is a main body side protruding portion protruding outward
a, 40b, 40c, and 40d are formed, and on the inner wall surface of the timing cover 5, as shown in FIG.
At four positions corresponding to the position d, projecting portions 41a, 41b, 41c, and 41d, which are case-side projecting portions provided with a cross-shaped hatch, are formed, and the timing cover 5 is connected to the cylinder block 2, the cylinder head 3, and the crank. When attaching to the case 4, the contact surfaces B1, B2, B3, and B4, which are the tip surfaces of the projections 40a to 40d, and the contact surfaces C1, C2, and C3, which are the tip surfaces of the projections 41a to 41d. Liquid sealing member such as FIP for C4
G (Formed In Place Gasket) 44 (see FIG. 6) is applied. The FIPG 44 is made of, for example, a room-temperature-curable silicone rubber-based liquid sealing material.

A side edge 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;
Many bosses provided on both side edges of the timing cover 5
FIPG 44 is also applied to the side edge 43 connecting the 32 when the timing cover 5 is attached.

Further, as shown in FIG. 6, the contact surfaces B1 to B4 of the projections 40a to 40d of the cylinder block 2
And the contact surfaces of the cylinder block 2, the cylinder head 3 and the side edges 42 of the crankcase 4 are formed so as to be located on the same plane, and the projections 41a to 41d of the timing cover 5 are in contact with each other. The surfaces C1 to C4 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.

The projections 40a and 40b and the projections 41a and 41b
It extends in the radial direction 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 has a long contact surface. It is a rib-shaped protrusion having a thin shape. With this shape,
Since the protrusions 41a and 41b also function as reinforcing ribs of the timing cover 5, vibration of the timing cover 5 around the crankshaft 6 due to vibration of the crankshaft 6 in the rotation axis direction is effectively suppressed.

Since the first embodiment shown in FIGS. 1 to 6 is constructed as described above, the FIPG 44 made of a room-temperature-curable silicone rubber-based liquid sealing material is connected to the protrusions 40a to 40d of the cylinder block 2. And the FIPG 44 is applied to the contact 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. After application 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, and Mounting hole 33
When the bolt 34 that has passed through is screwed and tightened into the screw hole 31 of the cylinder block 2, the cylinder head 3, and the crankcase 4, the timing cover 5 can Can be mounted on one end. 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 the moisture in the air and hardens, the side edge 43 of the timing cover 5 is integrated with the cylinder block 2, the cylinder head 3 and the side edge 42 of the crankcase 4. And the protrusions 41a to 41d of the timing cover 5 are integrally connected to the protrusions 40a to 40d of the cylinder block 2, the cylinder head 3, and the crankcase 4, so that both rigidities of the timing cover 5 are reduced. As a result, the timing cover 5 becomes less likely to vibrate with respect to an exciting force perpendicular to the plane.

For this reason, the cylinder block 2, the cylinder head 3, the crankcase 4 and the timing cover 5
Even if a large vibration occurs in the cam chain 10 sent between the timing cover 5 and the timing cover 5, the timing cover 5 does not cause a large elastic deformation and noise is hardly generated.

The space surrounded by the cylinder block 2, the cylinder head 3, the crankcase 4, which is the main body of the internal combustion engine 1, and the timing cover 5 is a side edge 42 of the cylinder block 2, the cylinder head 3, and the crankcase 4. And the F provided between the timing cover 5 and the side edge 43.
Closed with IPG44 and timing cover 5
Cylinder head cover 22 and oil pan
Because the 23 is closely attached, the noise of the cam chain 10 that is circulated in the space is less likely to leak to the outside.

Further, the protrusion 40a of the cylinder block 2
The contact surfaces B1 to B4 of the cylinder cover 2, the cylinder head 3, and the contact surfaces of the side edges 42 of the crankcase 4 are formed so as to be located on the same plane. Contact surfaces C1 to C4 of the protrusions 41a to 41d
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.
a to 40d, side edges 42 and protrusions 41a to 41d, side edges 43
The processing of the contact surface is 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 wide, the central portion of the timing cover 5 projects from the inner wall surface of the timing cover 5 to a location requiring reinforcement. Protrusion
Four projections 41a to 41d are formed, and the contact surfaces C1 to C4 of the projections 41a to 41d project from the outer wall surface of the cylinder block 2 by the hardened liquid sealing member FIPG44.
Since the timing cover 5 is firmly connected to the contact surfaces B1 to B4 of 40a to 40d, the rigidity and strength of the timing cover 5 are significantly increased, and the vibration resistance and noise insulation are greatly improved.

The projecting portions 41a to 41 of the timing cover 5
d protrudes at a position irrelevant to the inner rib 36 of the timing cover 5, but at a place where the function of the power transmission mechanism is not impaired, the inner rib 36 is protruded toward the cylinder block 2 to The inner rib 36 may be integrally joined to the corresponding rib-shaped protrusion via the FIPG 44. With such a configuration, the joint area of the FIPG 44 is increased, and the timing cover 5 is more firmly joined. Can be connected to the cylinder block 2.

The protruding portions 40a of the cylinder block 2
Since the protrusion 40d and the protrusions 41a to 41d of the timing cover 5 do not need to be formed in a boss for screwing the bolt, that is, since a hole through which the bolt penetrates or screw is formed, the maximum of the bolt can be obtained. Unlike the boss of the prior art having a diameter larger than the outer diameter, the protrusions 40a to 40d and the protrusions 41a to 41d are formed by the cylinder block 2, the cylinder head 3, the crankcase 4, and the timing cover 5. If there is no space due to members such as the cam chain 10, the cam chain drive sprocket 9, the pump drive sprocket 16, the chain 19, and the chain tensioner 12 which are arranged in the space, Since the degree of freedom in setting the shape and size is large, for example, it can be formed into an elongated shape, the protrusions 40a to 4 0d and protrusions 41a to 41
There are few restrictions on the arrangement position of d, and the projections 40a to 40d and the projections 41a to
Since 41d can be formed, noise can be more effectively cut 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.

Further, the protrusion 40a of the cylinder block 2
To 40d and the protruding portions 41a to 41d of the timing cover 5 can be formed in a boss shape as required.

In addition, the protrusion 40a of the cylinder block 2
40d or the protrusions 41a to 41d of the timing cover 5 are more 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 from the viewpoint of workability. , Projection of timing cover 5
By setting the lengths 41a to 41d slightly longer than the side edges 43 of the timing cover 5, the projections 40a to 40d of the cylinder block 2 and the projections of the timing cover 5 when the timing cover 5 is fastened to the cylinder block 2 are formed. 41a-41
The bonding with d can be further strengthened.

The recess 38 of the timing cover 5 (FIG. 6)
(See FIG. 2), the length of the protrusion 41c is short, so that machining is easy, and even when the protrusion 41c is formed thin, the protrusion 40c of the cylinder block 2 can be formed.
c can be accurately contacted. Especially on the cylinder block 2, cylinder head 3 and timing cover 5,
This is effective in a structure in which the protrusions 40a to 40d and the protrusions 41a to 41d are provided.

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

Further, the projecting portion of the timing cover 5
41a and 41c are provided in the space surrounded by the cam chain 10 which is an endless belt-shaped power transmission mechanism, so that the operation of the cam chain 10 is not adversely affected and the drive space of the drive unit is utilized by utilizing the dead space. It can be provided nearby.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the first
The present embodiment is different from the embodiment mainly in the projecting portion 40a and the projecting portion 41a, and has basically the same configuration in other respects. 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, the projecting portion 50 which is the main body side projecting portion and the projecting portion 51 which is the case side projecting portion respectively correspond to the projecting portions 40a and 41a of the first embodiment.
As will be described later, is formed as a projection with an oil passage because it has oil passages 52 and 53. And each projecting part 50, 51
Are composed of columnar portions 50a and 51a having a substantially circular cross-sectional shape, and rib-like portions 50b and 51b extending radially outward from the outer peripheral surface of the columnar portion toward the cylinder head 3 side.

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

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

The injection holes 57 are formed so that the injected lubricating oil has a component in the direction toward the cylinder block 2, and a part of the injected lubricating oil is transmitted to the cam chain drive sprocket 9. It is also supplied to the pump drive sprocket 16 and the chain 19 which are arranged adjacent to the cylinder block 2.

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

As described above, the oil passages 52 and 53 communicating with 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 formed in the protrusion 51. According to the second embodiment in which an injection hole 57 for injecting oil toward the cam chain 10 and the cam chain drive sprocket 9 is formed to form an oil supply device for the cam chain 10 and the cam chain drive sprocket 9, The same functions and effects as those of the first embodiment are provided, and the following functions and effects are provided.

The lubricating oil discharged from the lubricating oil pump 15 and supplied to the supply path 54 through the main gallery is
The oil is supplied to the oil passage 53 through the injection hole 57 of the projection 51 and is injected toward the cam chain 10 and the cam 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 forms the cam chain 10
The engagement sound, which is the contact sound between the drive shaft and the cam chain drive sprocket 9, is reduced. Similarly, the oil film formed by the injected lubricating oil adhering to the chain 19 and the pump drive sprocket 16 causes the chain 19 and the pump drive sprocket The meshing noise with 16 is reduced, and the noise is reduced.

The injection holes 57 are formed in the protruding portions 51 connecting the timing cover 5 and the cylinder block 2 in order to suppress the vibration of the timing cover 5.
Since a large space is not required unlike the case where a dedicated projection for forming the injection hole 57 is separately formed, the timing cover 5 is provided near the cam chain drive sprocket 9 around which the cam chain 10 is wound. From the viewpoints of both vibration suppression and lubrication of the cam chain 10, the protrusion 51
Also, when it is preferable that the injection holes 57 are disposed close to each other, they can be formed at appropriate positions.

Furthermore, since the projection 51 connects the timing cover 5 and the cylinder block 2 by being connected to the projection 50, the space formed between the timing cover 5 and the cylinder block 2 In the projecting direction of the projecting portion 51, the range of the formation position of the injection hole 57 near the timing cover 5 can be easily expanded.
The degree of freedom in setting the lubricating oil injection direction for the cam chain drive sprocket 9 and the cam chain drive sprocket 9 is further increased.

Although the oil passage 52 and the oil passage 53 are connected by the contact surfaces B5 and C5, the contact surfaces B5 and C5
Projections 50 are provided around the entire circumference of the openings 52a, 53a
Since there is the FIPG 44 that couples the lubricating oil to the protruding portion 51, it is possible to prevent the leakage of the lubricating oil from the connection portion between the oil passage 52 and the oil passage 53 without separately providing a sealing member such as an O-ring.

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

The cylinder block 2 constituting 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.
At least one projection may be provided on each of the main body of the internal combustion engine 1 and the timing cover 5.

The protrusion is provided on only one of the main body of the internal combustion engine 1 and the timing cover 5, and the protrusion is provided on the main body of the internal combustion engine 1 and the timing cover 5.
May be bound by FIPG44.
Further, at least one of such 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 formation position of the injection hole 57, and eventually the cam chain
The degree of freedom in setting the lubricating oil injection direction with respect to 10 is increased, and the injection hole 57 is formed at a position avoiding members that hinder oil supply to the cam chain 10 because it is located between the injection hole 57 and the cam chain 10. For example, the injection hole 57 can be formed at a position where oil supply to the cam chain 10 is optimal.

In the first embodiment, the case member is the timing cover 5 of the internal combustion engine 1. However, the case member may be a device other than the internal combustion engine 1. In this case, the case member may be the main body of the device. Is concluded.

In the second embodiment, the plurality of protrusions 40 formed on the cylinder block 2
a to 40c, 50 and one of the plurality of protrusions 41a to 41c, 51 formed on the timing cover 5 respectively.
0, 51, but if necessary, a plurality of protrusions 40a to 40c, 50 are used as protrusions with oil passages, and a plurality of protrusions 41a to 41c, 51 are protrusions with oil passages and used for refueling. It may be a projection. Further, by forming an injection hole in the projecting portion 50 to function as a lubrication 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 protrusion similar to the protrusion 50 is formed on the crankcase 4, and a protrusion similar to the protrusion 51 is formed on the timing cover 5. Lubricating oil may be injected to 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 protruding portions 50 and 51 may be shaped as shown in FIG. That is, the contact surface B5 of the protrusion 50
Around the opening 52a in the columnar portion 50a, a cylindrical convex portion 50a1 having an outer diameter smaller than that of the columnar portion 50a is formed, thereby forming a stepped contact surface. The 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 first contact surface B5 on which the FIPG 44 is applied.
a, and a second contact surface B5b of the protrusion 50a1 which is a tip surface parallel to the first contact surface B5a and which contacts a contact surface C5b of a recess 51a1 of the protrusion 51 described later.

The contact surface C5 of the projecting portion 51 is
Around the opening 53a, the concave portion 51a1 has a larger diameter than the opening 53a, and has a bottomed circular hole having a diameter slightly larger than the outer diameter of the convex portion 50a1 so that the convex portion 50a1 is fitted. Is formed to form a stepped contact surface, whereby the contact surface C5 is located on the same plane as the contact surface of the side edge 43 of the timing cover 5, and the FIPG 44 is The first contact surface C5a to be applied and the first contact surface C5a of the concave portion 51a1
And a second contact surface C5b that contacts the second contact surface B5b of the protrusion 50.

Therefore, the openings 52a, 53a of the two oil passages 52, 53
Are the first contact surfaces B5a and C5a to which FIPG 44 is applied,
The second contact surface B5 at a different position in the center line direction of the columnar portion
b, 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, C5a abut,
FIP applied to both first contact surfaces B5a and C5a before being cured
G44 does not enter the oil passages 52, 53 from the openings 52a, 53a. As described above, the protrusion 50a1 of the protrusion 50 and the recess 51a1 of the protrusion 51 are respectively formed by the liquid seal members F
An intrusion prevention structure for preventing the IPG 44 from invading the oil passages 52 and 53 is provided.

In each of the above embodiments, the power transmission mechanism is a valve transmission power transmission mechanism. However, the power transmission mechanism may be a driving power transmission mechanism such as an auxiliary machine other than the valve transmission system. Although a chain is used as the transmission mechanism, a gear or a belt may be used instead of the chain.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention and is a front view of an internal combustion engine provided with a case member mounting structure of the present invention.

FIG. 2 is a front view showing a state where a timing cover is removed in FIG. 1;

FIG. 3 is an external view of a timing cover.

FIG. 4 is an inner view of the timing cover.

FIG. 5 is a vertical 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. 7 shows a second embodiment of the present invention and is a front view of relevant parts when a timing cover is removed similarly to FIG. 2;

FIG. 8 is a vertical sectional view taken along the line VIII-VIII in FIG. 7 with the timing cover attached.

FIG. 9 is an enlarged view of a main part of the protrusion when the shape of the protrusion according to the second embodiment is changed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Cylinder block, 3 ... Cylinder head, 4 ... Crank case, 5 ... Timing cover, 6
... Crank shaft, 7 ... Intake and 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 ... Lubrication oil pump, 16 ... Pump drive sprocket, 17 ... Pump rotation 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 holes, 34 bolts, 35 outer ribs, 36 inner ribs, 37 ...
Curved ribs, 38 ... concave, 39 ... convex, 40a-40d, 41a-41
d: Projection, 42, 43 ... Side edge, 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-B5, C1-C5 ... contact surface.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02B 77/00 F02B 77/00 Z (72) Inventor Atsushi Tanaka 1-4-1 Chuo, Wako-shi, Saitama F-term in Honda R & D Co., Ltd. (reference) 3G013 BB30 BC08 BD01 CA06

Claims (5)

[Claims] At least one protruding portion that is in contact with the device main body is formed on an inner wall surface of a case member whose outer peripheral portion is fastened to the device main body by a plurality of fastening means. Wherein at least one protruding portion which is in contact with an inner wall surface of the case member is formed, and the protruding portion is connected to the device main body or the case member by a liquid seal member. Mounting structure. 2. An internal wall surface of an internal combustion engine case member, the outer periphery of which is fastened to the internal combustion engine body by a plurality of fastening means, is formed with at least one case-side projecting portion abutting on the internal combustion engine body. An internal combustion engine case member mounting structure, wherein the case-side protruding portion and the internal combustion engine main body are connected by a liquid seal member. 3. At least one body-side protrusion is formed on an outer wall surface of the internal combustion engine body at a position corresponding to the case-side protrusion, and the case-side protrusion and the body-side protrusion are formed. Is flush with the fastening surface between the internal combustion engine body and the internal combustion engine case member, and the liquid seal member is interposed on the contact surface between the case-side projection and the body-side projection. The mounting structure for an internal combustion engine case member according to claim 2, wherein 4. An inner wall surface of an internal combustion engine case member whose outer peripheral portion is fastened to the internal combustion engine body by a plurality of fastening means, wherein at least one projecting portion abutting on the internal combustion engine body is formed, or The internal combustion engine main body is formed with at least one protruding portion that is in contact with an inner wall surface of the internal combustion engine case member, and the protruding portion is connected to the internal combustion engine main body or the internal combustion engine case member by a liquid seal member. At least one of the projecting portions is a lubricating projecting portion. The lubricating projecting portion has an oil passage communicating with a lubricating oil supply passage formed in the internal combustion engine main body, and a lubricating oil in the oil passage. To
Refueling the power transmission mechanism, wherein an injection hole for injecting toward a power transmission mechanism disposed in a space formed between the internal combustion engine body and the internal combustion engine case member is formed. apparatus. 5. At least one case-side protrusion is formed on an inner wall surface of the internal combustion engine case member, and at least one case-side protrusion is formed on an outer wall surface of the internal combustion engine body at a position corresponding to the case-side protrusion. One body-side protrusion is formed, and the case-side protrusion and the body-side protrusion are connected by the liquid seal member interposed between the contact surfaces of the two, and the oiling protrusion is connected to the case-side protrusion. A projecting portion, wherein the oil passage is connected to the body-side oil passage formed on the body-side projection coupled to the lubrication projecting portion at the abutting surface, and through the body-side oil passage. The oil supply device for a power transmission mechanism according to claim 4, wherein the oil passage is a case-side oil passage that communicates with the supply passage, and the injection hole is connected to the case-side oil passage.