JP2002276733A - Mounting structure of cover member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover member mounting structure capable of compatibly establishing a sealing performance and a vibration control property of cover member. SOLUTION: The mounting structure of the cover member 10 installed on an engine body 12 comprises a gasket 13 installed between the engine body 12 and cover member 10 apart from them and for sealing the gap between the cover body 10 and engine body 12 to prevent the engine oil staying in the internal space between them from leaking out and vibration control members 15 and 16 installed in a position outside the internal space sealed by the gasket 13 and for suppressing vibrations from being transmitted to the cover member 12 from the side with engine body 10.

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 a cover member mounted on a vibrating body serving as a vibration source.
The present invention relates to a seal structure in which a cover member is required to have a vibration-proof property.

[0002]

2. Description of the Related Art Generally, when a cover member such as a rocker cover is attached to an engine body such as a cylinder head or the like, a gasket or a seal washer is used in order to secure the airtightness of an internal space in which a liquid material such as engine oil is stored. A sealing material is used. Further, in an engine body in which an intake / exhaust valve or the like is interposed, a driving sound and a sitting sound of the valve are generated. For this reason, it is necessary to take measures to reduce the transmission of vibration from the engine body side, which is a vibration source, and to suppress external radiation of sound (for example, see Japanese Patent Application Laid-Open No. 9-21346).

FIG. 15 is an explanatory view of a mounting structure of a cover member in the prior art. A cover member 100 such as a rocker cover is fixed to an engine body 120 such as a cylinder head by a fastener 110 such as a bolt.
A gasket 130 having a sealing function is interposed around an internal space (a space in which engine oil is stored) which is formed between the cover member 100 and the engine main body 120 and requires hermeticity. In addition, a seal washer 140 is fitted in a mounting portion of the fastener 110 to seal between the fastener 110 and the cover member 100. The seal washer 140 includes a seal portion 140a formed of a substantially cylindrical elastic body, and a flat-ring-shaped washer washer 140b attached above the seal portion 140a and pressing the seal portion 140a. By applying an appropriate surface pressure to the gasket 130 by tightening the fastener 110, the engine oil accumulated in the internal space between the cover member 100 and the engine body 120 is removed from the gasket 1.
Leakage from the 30 attachment sites is prevented. At the same time, the seal of the mounting portion of the fastener 110 and the cover member 1
00 is suppressed.

[0004]

However, in the cover member mounting structure in the prior art, the gasket 13 is not provided.
There is a possibility that oil leakage may occur during operation of the engine from the area sealed by the seal washer 140 or the seal washer 140. Since the engine speed changes over a wide range, it is considered that there is a resonance mode in which vibration transmitted from the engine body 120 to the cover member 100 is excited in a certain speed range. When this mode occurs,
The surface pressure on the gasket 130 decreases momentarily, and the mounting portion of the gasket 130 and the seal washer 140
The engine oil may leak from the mounting part of Gasket 130 and seal washer 140
In addition, not only the sealing performance but also the anti-vibration performance is required, but it is not easy to achieve both of these performances by design in the conventional structure.

Particularly, in the case of a horizontally opposed engine (the horizontal direction in FIG. 15 corresponds to the vertical direction of the engine), high-temperature engine oil is unevenly distributed below the engine (for example, right side in FIG. 15). (Left side in the figure). If such temperature non-uniformity occurs, the push-up force of the gasket 130 differs depending on the location, and a momentary force is generated in the cover member 100, which may cause oil leakage. Therefore, the gasket 130 and the seal washer 140 are required to have higher sealing performance and anti-vibration performance than engines other than the horizontally opposed engine.

In the conventional mounting structure, the gasket 1
There is also a problem that the durability of the seal 30 and the seal washer 140 is likely to be reduced (set). This is because it is considered that these members 130 and 140 are subjected to a repetitive load of an extremely short cycle. In addition to the high-temperature environment generated when the engine is running, the repetitive load that is not static and continues to be applied over time may haveten the deterioration of the durability of the gasket 130 and the seal washer 140.

As a countermeasure against the above-mentioned problem, as shown in FIG.
It is conceivable to adopt a structure in which the cover member 100 is not carried by itself. In this structure, the cover member 100 is brought into direct contact with the engine body 120, and the gasket 130 is completely sealed in the cover member 100. Further, a flange portion is formed on the entire periphery of the washer washer 140b constituting the seal washer 140, and this flange portion is brought into contact with the cover member 100 to completely seal the seal portion 140a in the washer washer 140b. Then, a metal lock washer 150 is added, and the fastener 110 is added thereto.
To take charge of all locks.

In this structure, the gasket 130 is embedded in the groove of the cover member 100 and is not exposed to the outside. Therefore, the gasket 130 is
It is not necessary to bear all the loads acting on the contact surface between the engine body 120 and the engine body 120. At the same time, the portion that directly contacts the high-temperature oil is reduced, and heat is also transmitted to the gasket 130 via the cover member 100.
Therefore, as compared with the structure of FIG.
Since the temperature environment of 0 can be lowered, it is advantageous in terms of sealing performance. However, on the other hand, since the cover member 100 is rigidly fixed to the engine body 120,
Vibration from the engine main body 120 side is easily transmitted directly to the cover member 100 side in contact therewith. Therefore, it is necessary to take some anti-vibration measures on the cover member 100 side.

The present invention has been made in view of such circumstances, and an object of the present invention is to achieve compatibility between sealing performance and vibration damping of a cover member with respect to a cover member mounting structure.

It is another object of the present invention to effectively suppress the vibration of the cover member with respect to the mounting structure of the cover member.

[0011]

According to a first aspect of the present invention, there is provided a mounting structure for a cover member mounted on an engine body, wherein the cover member is provided at a position separated between the engine body and the cover member. A gasket that seals so that the engine oil stored in the internal space between the cover member and the engine body does not leak,
Attachment of a cover member interposed at a portion located outside the internal space sealed by the gasket and having at least one vibration-proof member for suppressing transmission of vibration from the engine body side to the cover member side Provide structure.

Here, in the first aspect of the present invention, it is preferable that the gasket is further provided outside the mounting position, and further includes a fastener for fixing the cover member to the engine body. In this case, the vibration isolating member is interposed between the fastener and a mounting hole provided on the cover member side for inserting the fastener.

In a structure in which the cover is provided with a protrusion protruding toward the engine main body and provided outside the mounting position of the gasket, the second vibration isolating member is provided between the top of the protrusion and the engine. Preferably, it is interposed between the main body.

In the structure in which a projection protruding toward the cover member is provided on the engine body at the mounting position of the fastener, the vibration isolator inserts the fastener and the fastener provided on the cover member. It is preferable to be interposed between the mounting hole and the top of the protrusion.

Further, in the structure in which the cover has a projection protruding toward the engine body at the mounting position of the fastener, the second vibration isolating member is provided between the fastener and the top of the projection and the engine body. Is preferably interposed.

In the structure in which the projecting portion protruding toward the engine body is provided at the mounting position of the gasket on the cover member, the projecting portion is provided outside the mounting position of the gasket, and the top of the projecting portion is connected to the engine. It is desirable to further include a second vibration isolation member interposed between the main body and the main body.

According to a second aspect of the present invention, there is provided a mounting structure of a cover member mounted on an engine body, wherein the cover member is interposed between the engine body and the cover member and present between the cover member and the engine body. A gasket for sealing so that the engine oil stored in the internal space does not leak outside, and a cover member provided to be immersed in the engine oil stored in the internal space sealed by the gasket and transmitted to the cover member. And a vibration damping means for converting vibration energy into kinetic energy by stirring engine oil.

Here, in the second invention, it is preferable that the vibration damping means is provided in a vibration area surrounded by a fragile portion provided in the cover member.

In the second invention, the vibration damping means may be a vibration damping plate attached to a cover member.
Vibration suppression projections formed integrally with the cover member and protruding toward the engine body may be used.

According to a third aspect of the present invention, in a mounting structure of a cover member mounted on a vibrating body serving as a vibration source, the cover member is interposed in a separated portion between the vibrating body and the cover member.
A gasket that seals the liquid material stored in the internal space between the cover member and the vibrating body so as not to leak, and a gasket that is interposed in a portion located outside the internal space sealed by the gasket, Provided is a mounting structure of a cover member having at least one vibration-proof member that suppresses transmission of vibration to a cover member side.

According to a fourth aspect of the present invention, there is provided a mounting structure of a cover member mounted on a vibrating body serving as a vibration source, wherein a cover member and a vibrating body are interposed at a portion where the vibrating body and the cover member abut. A gasket for sealing so that the liquid material stored in the internal space existing therebetween does not leak to the outside, and a cover member provided on the cover member so as to be immersed in the liquid material stored in the internal space sealed by the gasket. Provided is a mounting structure of a cover member having vibration damping means for converting vibration energy transmitted to a member into kinetic energy by stirring a liquid material.

[0022]

FIG. 1 is a sectional view of a main part of a horizontally opposed engine to which the present invention is applied. A cylinder formed in a cylinder block (not shown) extends horizontally and horizontally about the crankshaft, and has a cylinder head 1 mounted on its left and right tops. Further, a rocker cover 2 is fixed to a cylinder head 1 which is an engine body by a plurality of bolts 3.
As shown by hatching in the figure, the engine oil which is a liquid material is unevenly distributed below the internal space formed by the cylinder head 1 and the rocker cover 2 due to the structure of the horizontally opposed engine. As will be described in detail in the following embodiments, the cylinder head 1 and the rocker cover 2 are sealed with a sealing material such as a gasket so that the stored engine oil, which is a liquid material, does not leak outside. . In addition, anti-vibration measures are taken to reduce noise caused by vibration of the cylinder head 1 serving as a vibration source.

(First Embodiment) FIG. 2 is an explanatory diagram of a cover member mounting structure according to a first embodiment. A cover member 10 corresponding to the rocker cover 2 is fixed to an engine body 12 corresponding to the cylinder head 1 by a fastener 11 corresponding to the bolt 3. In the present embodiment, the cover member 10 is not rigidly fixed to the engine body 12, and the gasket 13 and the vibration isolating members 15, 16 are interposed between the members 10, 12. .

Specifically, the cover member 10 is continuously provided with a protruding portion 10a protruding toward the engine body 12, and the protruding portion 1a is provided at the center of the top of the protruding portion 10a.
A groove is formed along the extending direction of Oa. The gasket 13 is fitted along the groove of the protrusion 10a,
It is interposed in a separated space existing between the top of the projection 10a and the engine body 12. The gasket 13 exhibits an effective sealing performance by tightening the fastener 11 and applying an appropriate surface pressure to the gasket 13. As a result, the internal space between the engine body 12 and the cover member 10 is sealed, and the engine oil stored inside does not leak outside the portion where the gasket 13 is provided.

The gasket 13 for the oil seal has a sufficient height and an appropriate volume so as to appropriately fit on the top of the protrusion 10a and on both surfaces of the engine body 12. In addition, the gasket 13 has a distortion allowance of, for example, 95% necessary for exhibiting an effective sealing function.
%, It is preferable to use a relatively flexible and heat-resistant material having elasticity so that distortion of about% can be secured.

At a predetermined position outside the mounting position of the gasket 13 (hence, no engine oil is present), a vibration isolating member 15 and a vibration isolating member 16 are interposed. These vibration isolating members 15 and 16 are members that suppress transmission of vibration generated on the engine body 12 side, which is a vibration source, by driving the interposed intake and exhaust valves to the cover member 10 side. is there. Such vibration isolating members 15 and 16 are made of an elastic material (for example, rubber) harder than the gasket 13. It is preferable that the compression ratio of the gasket 13 is smaller than that of the related art. In this case, the rocker cover 2 is supported by being firmly tightened by the vibration isolating members 15 and 16, and the gasket can independently select a preferable compression ratio.

The cover member 10 has a mounting hole 10c having a predetermined inner diameter at a predetermined position outside the mounting position of the gasket 13. This mounting hole 10c
, A fastener 11 is inserted, and the outer diameter of the fastener 11 is smaller than the inner diameter of the mounting hole 10c. Therefore,
The fastener 11 and the mounting hole 10c on the cover member 10 are separated from each other, and a predetermined clearance exists between the two. The anti-vibration member 15 has a cylindrical shape with a convex cross section in the axial direction.
And intervening in a separated space existing between them.

The engine body 1 is attached to the edge of the cover member 10 located outside the mounting position of the vibration isolating member 15.
Protrusions 10b protruding toward two sides are provided continuously. At the center of the top of the protrusion 10b, a groove is formed along the direction in which the protrusion 10b extends. Anti-vibration member 16
Is fitted along the groove of the protruding portion 10b in a separated space existing between the top of the protruding portion 10b and the engine body 12. The mounting position of the vibration isolating member 16 does not necessarily need to be the entire circumference of the cover member 10,
It may be partially scattered in the vicinity of the fastener 11.

In the present embodiment, the mounting position of the vibration isolating members 15 and 16 interposed between the cover member 10 and the engine body 12 is located outside the mounting position of the gasket 13. In other words, the vibration isolating members 15 and 16 are
3 and is provided outside the internal space (sealed sealed space) in which the engine oil is stored. Therefore, it is installed outside this internal space,
For the anti-vibration members 15 and 16 that do not come into contact with the engine oil, there is basically no need to consider the sealing performance, and design (material selection, volume setting, etc.) focusing on the anti-vibration function of the cover member 10 is performed. Just do it. In the case of the present embodiment, the engine body 12, the fastening tool 11, the cover member 10
In the transmission path of the vibration transmitted in this order, there is a vibration isolating member 15 having a vibration isolating function. The engine body 12
The vibration transmission path from the cover member 10 to the projecting portion 10b of the cover member 10 includes a vibration damping member 16 having a vibration damping function (and a vibration damping member 1).
5) exists. Therefore, the external radiation of the valve driving sound and the sitting sound generated on the engine body 12 side can be effectively suppressed by the vibration isolating members 15 and 16. On the other hand, as for the gasket 13 which comes into contact with the engine oil, the vibration proof function is handled by the vibration proof members 15 and 16, so that the vibration load is reduced. Therefore, the gasket 13 can be designed with emphasis on the oil seal function. Thus, the gasket 13 and the vibration isolating member 1
Separating the functions of each of 5 and 16 increases the degree of freedom in designing the sealing performance and the anti-vibration performance, so that these performances can be compatible.

Further, according to this embodiment, the accuracy of the mating surface between the engine body 12 and the cover member 10 may be coarser than the conventionally required level, which is advantageous in cost. Furthermore, by using a material of high hardness for the vibration isolating members 15 and 16, the caulking torque of the fastener 11 can be set higher than before, and the gasket 13 side can be set to a lower torque load than before.

According to the present embodiment, the cover member 1
An effective anti-vibration effect can be obtained without increasing the thickness of 0. Therefore, as compared with the method of increasing the plate thickness, an effective anti-vibration effect can be obtained with a slight structural modification without increasing the weight of the cover member 10.

(Second Embodiment) FIG. 3 is an explanatory diagram of a cover member mounting structure according to a second embodiment. As in the first embodiment, the present embodiment also separates the functions of the gasket and the vibration isolating member, but has a configuration that focuses on reducing the total number of components. Note that FIG.
The same reference numerals are given to members that are substantially the same as those described in (1), and details thereof are omitted here (the same applies to embodiments described later).

The protruding portion 1 protruding toward the cover member 10 at the mounting position of the fastening tool 11 is mounted on the engine body 12.
2a is formed. An anti-vibration washer 17 serving as an anti-vibration member is interposed between the fastener 11, the mounting hole 10 c provided on the cover member 10 side, and the top of the protruding portion 12 a provided on the engine body 12 side. . Here, a vibration-proof washer 17 having high hardness is used similarly to the first embodiment, and a vibration-tight washer 17 in which the tightening dimensions are easily managed is selected. First
The anti-vibration member 16 used in the embodiment is deleted, and the role of the anti-vibration washer 17 on the fastener 11 side is taken. In addition, as for a luxury vehicle, a packing for sound insulation and vibration proof may be inserted as necessary.

In order to facilitate the work of assembling the anti-vibration washer 17 formed of a hard elastic material, the anti-vibration washer 17 is cut or, as shown in FIG. An appropriate method such as preparing the washer 17a and the convex cylindrical grommet 17b as separate members is adopted.

According to the present embodiment, as in the first embodiment, the functions of the gasket 13 and the vibration-proof washer 17 are separated from each other, thereby achieving both the sealing performance and the vibration-proof performance. It becomes possible. Further, since the vibration isolating member 16 used in the first embodiment is not used, the total number of components can be reduced, which is advantageous in terms of cost.

(Third Embodiment) FIG. 5 is an explanatory diagram of a cover member mounting structure according to a third embodiment. As in the above-described embodiment, the functions of the gasket and the vibration isolating member are separated, but the configuration is focused on minimizing structural changes of the engine body 12.

More specifically, the engine body 1 shown in FIG.
Instead of the protrusion 12a on the second side, the cover member 10 is provided with a protrusion 10d protruding toward the engine body 12 at the mounting position of the fastener 11. In addition to the vibration isolating member 15 described above, the fastening tool 11 and the protrusion 1 provided on the cover member 10 side are provided at the mounting position of the fastening tool 11.
0d and the engine body 12 between the vibration isolator 18
Is interposed. Here, in order to easily assemble the vibration isolating member 18, as shown in FIG.
Is preferably divided into two cylindrical members 18a and 18b. In that case, for one member 18a,
It is previously fitted into the protruding portion 10d on the cover member 10 side.

According to this embodiment, for the same reason as in the second embodiment, the total number of components can be reduced. At the same time, there is no need to change the structure of the engine body 12 itself, such as the cylinder head, and it is possible to achieve both sealing performance and anti-vibration performance simply by changing the cover member 10 side.

(Fourth Embodiment) FIG. 7 is an explanatory view of a cover member mounting structure according to a fourth embodiment. As in the above-described embodiment, the functions of the gasket and the vibration isolating member are separated, but the configuration is such that the assembling work of the cover member can be facilitated and the parts management can be simplified.

A vibration isolating member 15 is provided at a position where the fastener 11 is mounted. At the same time, instead of the vibration isolating member 16 around the cover member 10, a vibration isolating member 19 is provided near the outside of the mounting position of the gasket 13. Specifically, the width of the protruding portion 10a formed to protrude toward the cover member 10 is increased, and outside the groove for fitting the gasket 13 of the protruding portion 10a, along the extending direction of the protruding portion 10a, A groove for fitting the vibration isolating member 19 is newly formed. The vibration isolating member 19
The protruding portion 10a is fitted along a groove outside the protruding portion 10a, and is interposed in a separated space existing between the top of the protruding portion 10a and the engine body 12.

Here, the tightening torque load of the tightening tool 11 is handled by the vibration isolating member 19, and the gasket 13 has a sufficient amount and height to absorb the bending. That is, the gasket 13 is configured to have a margin so as not to cause sag. The anti-vibration member 19 is made of a material having a high hardness and plays a role as a stopper. In order to fulfill this role effectively, it is preferable to set the interval between the fastener 11 and the vibration isolating member 19 as narrow as possible.

According to the present embodiment, the cover member 1 is provided in the vicinity of the gasket 13 by providing the vibration isolator 19 having the same role as the vibration isolator 16 used in the first embodiment.
0 can be easily assembled and parts management can be simplified.
Note that the vibration isolating member 19 only needs to be able to carry the tightening torque of the fastener 11, or may be provided only in the vicinity of the fastener 11. Further, it is not always necessary to have uniform dimensions over the entire circumference of the cover member 10. Note that a fin or the like may be provided between the gasket 13 and the vibration isolating member 19 so as not to cause a displacement.

(Fifth Embodiment) FIG. 8 is an explanatory diagram of a cover member mounting structure according to a fifth embodiment. The cover member 10 is fixed to the cylinder head 1 by the fastener 11.
Are fixed to the engine main body 12 corresponding to. The differences from the above-described first to fourth embodiments are that no vibration damping member is provided and that the cover member 10 is rigidly fixed to the engine body 12 (the sixth embodiment described later). The same applies to the embodiment). The gasket 13 is fitted along the groove of the projection 10a,
Between the top of the engine and the engine body 12 without being exposed. Therefore, since the vibration generated on the engine body 12 side is directly transmitted to the cover member 10 side, it is necessary to take some measures regarding valve driving and external radiation of seating noise.

In this embodiment, the cover member 1 is formed by an appropriate method such as providing a groove or a bellows on the inner periphery of the cover member 10.
0, a continuous and thin fragile portion 10e is formed.
The vibration region 10f surrounded by the fragile portion 10e can be displaced in the width direction with the fragile portion 10e as a fulcrum. Note that the vibration region 10f is formed between the cover member 10 and the engine body 1.
2 and corresponds to the internal space in which the engine oil is formed and stored therein.

The vibration region 1 is located on the inner wall side of the cover member 10 (the inner space side where the engine oil is stored).
At approximately the center of 0f, the brake plate 30 is fixed with bolts 31. The brake plate 30 is a member for absorbing vibration transmitted from the engine body 12 to the cover member 10, and for example, a plate member having a radial shape or a porous shape can be used. The shape of the damping plate 30 is appropriately designed by changing the length, the size of the hole, and the distribution so as to adopt a shape capable of absorbing the vibration in accordance with the distribution of the frequency characteristics of the vibration.

FIG. 9 is an explanatory view of the braking plate 30 having a radial shape. The brake plate 30 has a large number of arms 30b of different lengths extending radially around a mounting hole 30a of a bolt 31. Since the braking plate 30 having such a shape has a wide frequency characteristic, even if the vibration frequency varies widely with a change in the engine speed, the arm 30b having a different length can cope with each frequency band.

FIG. 10 is an explanatory view of a perforated braking plate 30. The brake plate 30 is provided with a large number of holes 30c in order to easily receive the viscous resistance of the engine oil. Also, in order to respond to a wide range of changes in vibration frequency,
The holes 30c are set to various diameters.

In the vibration damping plate 30 having such a shape, only the portion below the engine (right side in FIG. 8) is immersed in the engine oil at the time of low engine rotation. On the other hand, when the engine is running at high speed, the amount of the engine oil increases, so that almost the entire brake plate 30 is immersed in the engine oil. The vibration transmitted from the engine main body 12 to the cover member 10 is transmitted to the damping plate 30 via the bolts 31 to try to vibrate the damping plate 30. However, since the damping plate 30 is immersed in the engine oil, the vibration energy is consumed for stirring the engine oil due to the viscous resistance of the engine oil. That is, the vibration energy is converted into kinetic energy by the damping plate 30. The stirring of the engine oil by the damping plate 30 is easily absorbed as the vibration speed increases,
Easy to disappear.

As described above, according to the present embodiment, since the cover member 10 is in direct contact with the engine body 12,
The vibration on the engine body 12 side is directly transmitted to the cover member 10. However, the vibration region 10 of the cover member 10
Most of the vibration energy is consumed for stirring the engine oil by the action of the damping plate 30 attached to f. By such conversion into kinetic energy, the cover member 1
Vibration and noise transmitted to the zero side can be effectively suppressed from being radiated to the outside.

As a modification of the structure of FIG. 8, FIG.
As shown in FIG.
It is also possible to attach 0 (the same applies to the sixth embodiment described below). However, from the viewpoint of improving the conversion efficiency to kinetic energy, a vibration region 30f that is easily vibrated by the fragile portion 10e is provided, and the vibration damping plate 30 is provided there.
It is preferable to attach

(Sixth Embodiment) FIG. 12 is an explanatory diagram of a cover member mounting structure according to a sixth embodiment. In the present embodiment, instead of using the damping plate 30 described in the fifth embodiment, a large number of damping projections 4 are provided on the inner wall side of the fragile portion 10e.
0 is provided integrally. The vibration damping projection 40 is a portion that absorbs vibration transmitted from the engine body 12 to the cover member 10.

The shape of the braking projection 40 may be, for example, a cylindrical pin shape as shown in FIG. In this case, the height or thickness of the pin is preferably set in various ways according to the distribution of the vibration frequency characteristics, and may be tapered so that the tip of the pin is easily shaken. Further, it is desirable that the pins are arranged in a checkerboard shape or a houndstooth check pattern. Further, as shown in FIG. 14, the braking projection 40 may be formed in a flat plate shape. The width, thickness, or shape of the flat plate is preferably set variously according to the distribution of the vibration frequency characteristics, and is preferably arranged in a matrix or a staggered lattice. In addition, the braking protrusion 40 is
In addition to the flat plate shape, a strip shape or a trapezoid shape may be used, and these may be appropriately cut. In any case, it is preferable that the braking projections 40 have variations so that vibrations in a wide range can be effectively absorbed in accordance with the distribution of the vibration frequency characteristics.

When the vibration damping projection 40 having a small pin shape as shown in the top view of FIG. 13A and the perspective view of FIG. 13B is used, the vibration energy transmitted to the cover member 10 is obtained. As a result, the pin tip swings and vibrates. Thereby, the engine oil is agitated, and the vibration energy can be effectively absorbed. In addition, FIG.
In the case where the thin plate-shaped partition shown in the top view and the perspective view of FIG. 2B is used as the damping member 40, the vibration energy can be effectively absorbed by the same principle.

As described above, according to the present embodiment, since the cover member 10 is in contact with the engine body 12, the vibration on the engine body 12 side is directly transmitted to the cover member 10. This vibration is transmitted to the vibration damping projection 40 formed integrally with the vibration region 10f of the cover member 10. By providing the damping projections 40, the area of the cover member 10 that comes into contact with engine oil can be increased. Further, most of the vibration energy is converted into kinetic energy by stirring the engine oil by the vibration of the vibration damping projection 40. Further, by integrally forming the vibration damping projection 40 on the cover member 10,
Since the apparent thickness of the cover member 10 increases, transmitted sound can be effectively shielded. As a result, the radiation of sound from the cover member 10 to the outside can be effectively suppressed.

In this embodiment, since the vibration damping projections 40 are formed integrally with the cover member 10, there is no need to prepare the vibration damping plate 30 described in the fifth embodiment as a separate member. Therefore, there is an effect that the total number of parts can be reduced and cost reduction including work efficiency can be achieved.

In each of the above-described embodiments, the rocker cover has been described as an example of the cover member. However, the cover member is not limited to the rocker cover, and various cover members including an oil pan and the like can be used. The present invention can be widely applied to such a mounting structure of a cover member.

In each of the embodiments described above, the engine body (cylinder head) is used as an example of the vibrating body serving as the vibration source.
Was explained. The application to an engine with particularly demanding requirements for weight reduction and cost is the most preferred embodiment of the present invention. However, the present invention is not limited to this, and a cover member in which a liquid material represented by oil, gasoline, water, or the like is stored in the internal space and vibration countermeasures are required from the vibrating body side serving as a vibration source It can be widely applied to the mounting structure.

[0058]

According to the present invention, a gasket and a vibration isolating member are provided between a vibrating body such as an engine body, which is a vibration source, and a cover member in a state of being separated from each other.
The mounting position of the vibration isolating member is outside the internal space in which the liquid such as engine oil is stored, and does not directly contact the liquid. Therefore, a sealing function like a gasket is basically not required for the vibration isolating member, and the vibration isolating function of the cover member has priority. On the other hand, as for the gasket which comes into direct contact with the liquid material, the vibration-proof function is handled by the vibration-proof member, so that the vibration load is reduced. Therefore, sealing performance is prioritized in gasket design.
In this way, by separating the functions of the gasket and the vibration isolating member, the degree of freedom in designing the sealing performance and the vibration isolating performance is increased, and it is possible to achieve both of these performances.

Further, the vibration energy transmitted to the cover member is converted into the kinetic energy of stirring the liquid material by separately attaching the vibration damping plate to the cover member or integrally forming the vibration damping projection on the cover member. Convert. Thereby, since the vibration energy transmitted from the vibrating body as the vibration source to the cover member can be effectively absorbed, the vibration of the cover member can be effectively reduced, and the external radiation of sound from the cover member can be effectively reduced. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a horizontally opposed engine.

FIG. 2 is an explanatory diagram of a mounting structure of a cover member according to the first embodiment.

FIG. 3 is an explanatory diagram of a cover member mounting structure according to a second embodiment.

FIG. 4 is an explanatory view of a washer and a grommet constituting a vibration isolating washer.

FIG. 5 is an explanatory diagram of a cover member mounting structure according to a third embodiment.

FIG. 6 is an explanatory diagram of a configuration of a vibration isolation member according to a third embodiment.

FIG. 7 is an explanatory diagram of a cover member mounting structure according to a fourth embodiment.

FIG. 8 is an explanatory diagram of a mounting structure of a cover member according to a fifth embodiment.

FIG. 9 is an explanatory diagram of a radial-shaped damping plate according to a fifth embodiment.

FIG. 10 is an explanatory view of a perforated braking plate according to a fifth embodiment.

FIG. 11 is an explanatory diagram of a mounting structure of a cover member having no fragile portion.

FIG. 12 is an explanatory diagram of a cover member mounting structure according to a sixth embodiment.

FIG. 13 is an explanatory view of a cylindrical vibration-damping projection according to a sixth embodiment.

FIG. 14 is an explanatory view of a plate-shaped vibration damping projection according to the sixth embodiment.

FIG. 15 is an explanatory view of a mounting structure of a cover member in a conventional technique.

FIG. 16 is an explanatory view of a mounting structure of a cover member in a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Rocker cover 3 Bolt 10 Cover member 11 Fastening tool 12 Engine main body 13 Gasket 15, 16, 18, 19 Vibration-proof member 17 Vibration-proof washer 20 Cover member 30 Braking plate 31 Bolt 40 Vibration-suppression projection

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sumio Kiriki 3-9-6 Osawa, Mitaka City, Tokyo Inside Subaru Research Institute, Inc. (72) Inventor Minoru Kagawa 3-9-6 Osawa, Mitaka City, Tokyo Stock In Subaru Research Laboratory (72) Inventor Yasunobu Ninomiya 3-9-6 Osawa, Mitaka-shi, Tokyo F-term in Subaru Research Laboratories (Reference) 3G024 AA72 BA21 FA02 FA08 GA26 3J048 AA01 AC01 BA06 EA01

Claims (12)

[Claims] 1. A mounting structure for a cover member mounted on an engine body, wherein the cover member is interposed in a space between the engine body and the cover member, and is provided in an internal space between the cover member and the engine body. A gasket for sealing so that stored engine oil does not leak; and a gasket interposed in a portion located outside the internal space sealed by the gasket, and vibration transmitted from the engine body side to the cover member side. A cover member mounting structure comprising at least one vibration isolating member for suppressing noise. 2. The apparatus according to claim 2, further comprising: a fastener mounted outside the mounting position of the gasket and fixing the cover member to the engine body, wherein the vibration isolating member includes the fastener and the cover member. The cover member mounting structure according to claim 1, wherein the cover member is provided between the mounting member and a mounting hole for inserting the fastener. 3. The cover member is provided outside the mounting position of the gasket and has a protruding portion protruding toward the engine main body, between the top of the protruding portion and the engine main body. The mounting structure for a cover member according to claim 2, further comprising a second vibration isolating member interposed in the cover member. 4. The engine body has a protrusion protruding toward the cover member at a position where the fastener is mounted, and the vibration isolating member is provided on the fastener and the cover member. 3. The cover member mounting structure according to claim 2, wherein the cover member is interposed between a mounting hole for inserting a fastener and a top of the protrusion. 5. The cover member has a protrusion protruding toward the engine body at a position where the fastener is mounted, and is interposed between the fastener, the top of the protrusion, and the engine body. 3. The cover member mounting structure according to claim 2, further comprising a second vibration isolation member. 6. The cover member has a protruding portion protruding toward the engine main body at a mounting position of the gasket, and is provided outside the mounting position of the gasket at the protruding portion. The mounting structure for a cover member according to claim 2, further comprising a second vibration isolating member interposed between the top of the engine and the engine body. 7. A mounting structure for a cover member mounted on an engine body, wherein an internal space is interposed between a portion where the engine body and the cover member are in contact with each other and between the cover member and the engine body. A gasket for sealing the engine oil stored in the cover member so as not to leak outside; and a gasket provided to the cover member so as to be immersed in the engine oil stored in the internal space sealed by the gasket and transmitted to the cover member. And damping means for converting the vibration energy into kinetic energy by stirring the engine oil. 8. The mounting structure for a cover member according to claim 7, wherein said vibration damping means is provided in a vibration area surrounded by a fragile portion provided on said cover member. 9. The vibration control device according to claim 7, wherein the vibration control means is a vibration control plate attached to the cover member.
The mounting structure of a cover member described in the above. 10. The cover member according to claim 7, wherein said vibration damping means is a vibration damping projection integrally formed on said cover member and projecting toward said engine body. Mounting structure. 11. A mounting structure for a cover member mounted on a vibrating body serving as a vibration source, wherein the cover member is interposed in a separated portion between the vibrating body and the cover member, and between the cover member and the vibrating body. A gasket that seals so that the liquid stored in the internal space does not leak, and a gasket that is interposed in a portion located outside the internal space sealed by the gasket and that vibrates from the vibrator side to the cover member side. An attachment structure for a cover member, comprising: at least one vibration isolation member that suppresses transmission. 12. A mounting structure for a cover member mounted on a vibrating body serving as a vibration source, wherein a cover member is interposed between the vibrating body and the vibrating body while being interposed between the vibrating body and the vibrating body. A gasket for sealing so that the liquid material stored in the existing internal space does not leak outside, and provided on the cover member so as to be immersed in the liquid material stored in the internal space sealed by the gasket, And a vibration damping means for converting vibration energy transmitted to the cover member into kinetic energy by stirring the liquid material.