JP4436337B2 - Oil pan and internal combustion engine - Google Patents

Description

  The present invention relates to an oil pan and an internal combustion engine.

Conventionally, an element called an oil pan is known as one of a plurality of sound generating parts that generate sound in an internal combustion engine. The oil pan is an element attached to the lower part of the internal combustion engine, and plays a role of an oil receiver that receives oil that is a lubricant in the internal combustion engine.
The oil pan is an element formed from a thin plate, and is formed in a shape in which the lid of the lunch box is turned over. That is, the oil pan is formed as a container composed of a bottom plate arranged to face the lower surface of the crankcase of the internal combustion engine and a side plate extending from the end of the bottom plate toward the crankcase.

Vibration generated in the internal combustion engine is transmitted to the oil pan through the crankcase. Due to the transmitted vibration, the side surface and the like of the oil pan are vibrated in the out-of-plane direction to generate sound.
In order to prevent the generation of sound from the oil pan, various technologies have been proposed, such as a technology for increasing the thickness of the oil pan and a technology for providing a stepped portion made of irregularities such as ribs on the oil pan. (For example, refer to Patent Document 1).
JP 2000-45789 A

However, the technique of increasing the thickness of the oil pan has a problem that it is difficult to sufficiently reduce the sound generated from the oil pan. Further, when the plate thickness is increased while keeping the outer dimensions of the oil pan the same, there is a problem that the amount of oil that can be stored in the oil pan decreases. On the other hand, if the plate thickness is increased while the amount of oil that can be stored in the oil pan is kept the same, the outer dimension of the oil pan becomes large, and the mountability of the internal combustion engine is reduced.
Moreover, in the technique of providing the step portion on the oil pan, there is a problem that it is difficult to sufficiently reduce the sound generated from the oil pan.
In the technique described in Patent Document 1, since the sound insulation structure is provided on the outer surface of the oil pan, there is a problem in that the outer dimensions of the oil pan are increased and the mountability of the internal combustion engine is deteriorated. On the other hand, when the sound insulation structure is provided with the same outer dimensions of the oil pan, there is a problem that the amount of oil that can be stored in the oil pan is reduced.

  The present invention has been made to solve the above-described problem, and an object thereof is to provide an oil pan and an internal combustion engine that can reduce the noise of the internal combustion engine without reducing the amount of oil stored in the oil pan. And

In order to achieve the above object, the present invention provides the following means.
An oil pan according to the present invention includes a bottom plate disposed to face a crankcase, and a side plate extending from an edge portion of the bottom plate toward the crankcase, and the edge portion on the crankcase side of the side plate. Is formed as a sinusoidal curved shape in a side view, and is formed with a suppressing portion that suppresses propagation of vibration from the crankcase to the side plate.

According to the present invention, since the suppressing portion is formed on the side plate, the propagation of vibration from the crankcase to the oil pan can be suppressed, and the sound emitted from the oil pan can be reduced.
The suppression unit reduces the propagation of vibration propagated from the crankcase to the oil pan, specifically, vibration in a direction substantially orthogonal to the surface of the side plate or the like (hereinafter referred to as an out-of-plane direction). Thus, the out-of-plane vibration of the side plate or the like can be reduced. Since the acoustic radiation radiated from the surface is proportional to the speed of the out-of-plane vibration, the acoustic radiation can be reduced and the sound emitted from the oil pan can be reduced by reducing the out-of-plane vibration of the side plate or the like. .
Since the suppression part is provided in the crank case vicinity area | region in a side plate, it can provide without reducing the amount of stored oil in an oil pan.
That is, since oil is stored in the region near the bottom plate of the oil pan, the amount of storage is not reduced by the suppressing portion provided in the region near the crankcase.

Suppression unit, since a rim portion formed in a curved shape at the tip of the side plate, it is possible to reduce the sound emitted from the oil pan.
Since the edge portion is formed in a curved shape, the strength of the side plate changes for each portion along with the curved shape. Therefore, the entire side plate is less likely to vibrate at the same frequency, and propagation of vibration from the crankcase to the oil pan is suppressed. As a result, the out-of-plane vibration of the side plate is weakened, so that the acoustic radiation from the side plate is reduced, and the sound emitted from the oil pan can be reduced.
Since the suppressing portion is an edge portion formed at the tip of the side plate, the amount of stored oil in the oil pan is not reduced. That is, since the edge part formed in the front-end | tip in a side plate is a suppression part, it does not affect the volume in an oil pan at all.

  In the above invention, the wavelength of the curved shape of the edge portion is a wavelength of λ / 2 or more and λ or less with respect to the wavelength λ of the vibration mode of the crankcase when sound of a predetermined frequency is generated. desirable.

According to the present invention, since the wavelength of the curved shape of the edge is a wavelength not less than λ / 2 and not more than λ with respect to the wavelength λ of the vibration mode of the crankcase when sound of a predetermined frequency is generated. The sound emitted from the pan can be reduced.
Since the wavelength of the curved shape of the edge portion is a wavelength not less than λ / 2 and not more than λ with respect to the wavelength λ, the vibration related to the vibration mode of the crankcase when sound of a predetermined frequency is generated is From being transmitted to the oil pan. As a result, the out-of-plane vibration of the side plate is weakened, so that the sound radiation by the side plate is reduced, and the sound of a predetermined frequency emitted from the oil pan can be reduced.

  In the above invention, it is desirable that the wavelength of the curved shape of the edge is determined so that the resonance frequency in the oil pan and the resonance frequency in the crankcase are different.

According to the present invention, since the wavelength of the curved shape of the edge is determined so that the resonance frequency in the oil pan and the resonance frequency in the crankcase are different, the sound emitted from the oil pan can be reduced. .
That is, since the resonance frequency between the oil pan and the crankcase is different, it is difficult for vibration to propagate from the crankcase to the oil pan. As a result, the out-of-plane vibration of the side plate is weakened, so that the acoustic radiation from the side plate is reduced, and the sound emitted from the oil pan can be reduced.

  In the above invention, the restraining portion is a joint surface with the crankcase in the side plate, and the joint surface is formed to extend in a direction intersecting the direction along the surface of the side plate. It is desirable that

According to the present invention, since the joining surface is formed so as to extend in a direction intersecting with the direction along the surface of the side plate, the sound emitted from the oil pan can be reduced.
Since the joint surface extends in a direction intersecting with the direction along the surface of the side plate, a part of the vibration in the out-of-plane direction in the crankcase is converted into the vibration in the in-plane direction of the side plate. Therefore, the side plate is vibrated in the out-of-plane direction due to the remaining vibration. As a result, the acoustic radiation by the side plate is reduced, and the sound emitted from the oil pan can be reduced.
Since the suppressing portion is a contact surface that contacts the crankcase in the side plate, the amount of stored oil in the oil pan is not reduced. That is, since the contact surface of the side plate that contacts the crankcase is the suppressing portion, the volume in the oil pan is not affected at all.

  In the above invention, it is desirable that the restraining portion is a bent portion that bends the side plate in the direction of the bottom plate and is rotatable in a direction in which a tip portion intersects the surface of the side plate.

According to this invention, the sound emitted from an oil pan can be reduced by forming the bending part in the side plate.
Since the bent portion is rotatable in the direction in which the tip portion intersects the surface of the side plate, the bending portion absorbs the vibration in the out-of-plane direction transmitted from the crankcase by the turning operation of the tip portion. Can do. That is, by providing a bent portion on the side plate and making the side plate a flexible structure, vibration in the out-of-plane direction can be absorbed by the bent portion. Therefore, the vibration in the out-of-plane direction is not propagated to the side plate on the bottom plate side from the bent portion, or is attenuated and propagated to the side plate on the bottom plate side from the bent portion. As a result, the acoustic radiation by the side plate is reduced, and the sound emitted from the oil pan can be reduced.
Since the suppressing portion is a bent portion formed on the side plate, the amount of stored oil in the oil pan is not reduced. That is, since the bent part in the side plate is the suppressing part, the volume in the oil pan is not affected at all.

An oil pan according to the present invention includes a bottom plate disposed to face a crankcase, and a side plate extending from an edge portion of the bottom plate toward the crankcase, and the edge portion on the crankcase side of the side plate. Are bent toward the outside and bent toward the bottom plate side, and the vibration in the out-of-plane direction of the crankcase is converted into a rotational motion to suppress propagation of vibration from the crankcase to the side plate , and A bent portion having a joint surface to be joined to the crankcase is formed .

According to the present invention, since the restraint portion is provided, the vibration of the side plate due to the vibration propagated from the crankcase to the oil pan can be suppressed, and the sound emitted from the oil pan can be reduced.
The restraint portion can suppress the vibration of the side plate, specifically, the vibration in the out-of-plane direction of the side plate. Since the acoustic radiation radiated from the surface is proportional to the speed of the out-of-plane vibration, reducing the out-of-plane vibration of the side plate or the like can reduce the acoustic radiation and reduce the sound emitted from the oil pan. it can.
Since the restraining portion is provided on the inner surface of the side plate and can store oil therein, the amount of stored oil in the oil pan is not reduced.

  According to the present invention, since the oil pan of the present invention is provided, propagation of vibration from the crankcase to the oil pan can be suppressed, and sound emitted from the oil pan can be reduced. Further, the amount of stored oil in the oil pan is not reduced.

According to the oil pan and the internal combustion engine of the present invention, since the suppressing portion is formed on the side plate, the propagation of vibration from the crankcase to the oil pan can be suppressed, and the sound emitted from the oil pan can be reduced. There is an effect that can be done.
Since the suppression part is provided in the crank case vicinity area | region in a side plate, there exists an effect that the noise of an internal combustion engine can be reduced, without reducing the amount of stored oil in an oil pan.

[First Embodiment]
Hereinafter, an internal combustion engine according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a perspective view for explaining the outline of the internal combustion engine according to the present embodiment.
The internal combustion engine 1 according to the present invention is used for, for example, an agricultural machine such as a tractor or an internal combustion engine of a construction machine such as a forklift, but may be used for other purposes and is not particularly limited.
As shown in FIG. 1, the internal combustion engine 1 includes a crankcase 3 and an oil pan 5.
The crankcase 3 includes a piston (not shown), an output shaft 7 connected to the piston, and the like.
The oil pan 5 is a container coupled to the lower part of the crankcase 3 using bolts or the like, and temporarily stores oil used for lubricating the internal combustion engine 1 therein. The oil pan 5 is specifically formed by pressing a metal plate or the like.

FIG. 2 is a perspective view illustrating the configuration of the oil pan of FIG.
As shown in FIG. 2, the oil pan 5 includes a bottom plate 9, a side plate 11, a front plate 13, and a rear plate 15.
The bottom plate 9 is a plate disposed at a position facing the crankcase 3, and forms the bottom surface of the oil pan 5. The side plate 11, the front plate 13, and the rear plate 15 are plates that extend from the edge of the bottom plate 9 toward the crankcase 3, and form the side surfaces of the oil pan 5. The front plate 13 and the rear plate 15 are formed with arc-shaped recesses 17 corresponding to the output shaft 7 of the crankcase 3.
An edge portion (suppressing portion) 19 on the side of the crankcase 3 (upper side in FIG. 2) in the side plate 11 is formed as a sinusoidal curved shape. The edge 19 is formed so as to have a wavelength of λ / 2 or more and λ or less with respect to the wavelength λ of the vibration mode of the crankcase 3 when sound of a predetermined frequency is generated from the internal combustion engine 1.
Examples of the predetermined frequency include the frequency of the sound having the highest sound pressure level among the sounds generated from the internal combustion engine 1.

Next, the operation of the internal combustion engine 1 having the above configuration will be described.
When the internal combustion engine 1 is operated, the crankcase 3 is vibrated by the movement of the piston, the output shaft 7 and the like. The vibration in the crankcase 3 includes vibrations of various frequencies, and in particular, vibration that matches the vibration mode of the crankcase 3 becomes significant. Among these vibrations, sound is radiated from the surface in proportion to the speed of vibration in the out-of-plane direction on the surface of the crankcase 3 or the like.
Since the edge portion 19 is formed on the side plate 11 of the oil pan 5, the vibration of the crankcase 3 is hardly transmitted to the oil pan 5 coupled to the lower portion. When the vibration of the crankcase 3 is difficult to propagate to the oil pan 5, the vibration of the side plate 11 and the like is reduced.

According to said structure, since the edge part 19 is formed in the side plate 11, the propagation of the vibration from the crankcase 3 to the oil pan 5 can be suppressed, and the sound emitted from the oil pan 5 can be reduced. it can.
The edge portion 19 reduces the out-of-plane vibration of the side plate 11 and the like by reducing the propagation of vibration propagated from the crankcase 3 to the oil pan 5, specifically, out-of-plane vibration of the side plate 11 and the like. can do. Since the acoustic radiation radiated from the surface is proportional to the speed of the out-of-plane vibration, the acoustic radiation is reduced by reducing the out-of-plane vibration of the side plate 11 and the like, and the sound emitted from the oil pan 5 is reduced. Can do.

Since the sinusoidal wavelength at the edge 19 is a wavelength that is not less than λ / 2 and not more than λ with respect to the wavelength λ of the vibration mode of the crankcase 3 when sound of a predetermined frequency is generated, the oil pan 5 The sound emitted can be reduced.
Since the edge portion 19 is formed in a sine wave shape, the strength of the side plate 11 varies from portion to portion as the sine wave shape is formed. Therefore, the entire side plate 11 is less likely to vibrate at the same frequency, and vibration propagation from the crankcase 3 to the oil pan 5 is suppressed. In particular, the vibration related to the wavelength λ of the vibration mode of the crankcase 3 is difficult to propagate from the crankcase 3 to the oil pan 5. As a result, since the out-of-plane vibration of the side plate 11 is weakened, the acoustic radiation by the side plate 11 is reduced, and the sound of a predetermined frequency emitted from the oil pan 5 can be reduced.

Since the edge portion 19 is formed at the tip of the crankcase 3 in the side plate, the amount of stored oil in the oil pan 5 is not reduced.
That is, the oil is stored in the vicinity of the bottom plate of the oil pan 5, so that the storage amount is not reduced by the edge 19 formed at the tip of the crankcase 3.

As described above, the edge portion 19 may have a sinusoidal shape, and may have a shape having a wavelength of λ / 2 or more and λ or less with respect to the wavelength λ of the vibration mode of the crankcase 3. The sine wave shape 19 may be a sine wave shape having a wavelength different from the resonance frequency of the oil pan and the resonance frequency of the crankcase, and is not particularly limited.
With such a configuration, it is possible to reduce the sound emitted from the oil pan 5. That is, since the resonance frequency between the oil pan 5 and the crankcase 3 is different, vibration is hardly transmitted from the crankcase 3 to the oil pan 5. As a result, the out-of-plane vibration of the side plate 11 becomes weak, so that the acoustic radiation by the side plate 11 is reduced, and the sound emitted from the oil pan 5 can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. 3 and FIG.
The basic configuration of the internal combustion engine of the present embodiment is the same as that of the first embodiment, but the configuration of the oil pan is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the configuration of the oil pan will be described using FIG. 3 and FIG. 4, and description of other components will be omitted.
FIG. 3 is a perspective view illustrating the configuration of the internal combustion engine according to the present embodiment. FIG. 4 is a partial cross-sectional view illustrating the configuration of the oil pan of FIG.
In addition, the same code | symbol is attached | subjected about the component same as 1st Embodiment, and the description is abbreviate | omitted.

As shown in FIG. 3, the internal combustion engine 101 includes a crankcase 103 and an oil pan 105.
The crankcase 103 includes a piston (not shown), an output shaft 7 connected to the piston, and the like.
As shown in FIG. 4, the oil pan 105 is a container coupled to the lower part of the crankcase 103 using bolts 104 or the like, and temporarily stores oil used for lubricating the internal combustion engine 101 therein. It is.

As shown in FIG. 4, the oil pan 105 includes a bottom plate 9, a side plate 111, a front plate 13, and a rear plate 15 (see FIG. 3).
The side plate 111 is a plate extending from the edge of the bottom plate 9 toward the crankcase 103 and forms a part of the side surface of the oil pan 105. An oil pan joint surface (joint surface, suppressing portion) 105A that is inclined toward the outside of the oil pan 105 toward the crank case 103 is formed at the tip of the side plate 111 on the crank case 103 side (upper side in FIG. 4). Yes. That is, the oil pan joining surface 105 </ b> A is formed to extend in a direction intersecting with the direction along the surface of the side plate 111.
On the other hand, the surface of the crankcase 103 that contacts the oil pan joint surface 105A is a crankcase joint surface 103A that slopes inward of the crankcase 103 toward the oil pan 105 in accordance with the inclination of the oil pan joint surface 105A. ing.
The bolt 104 is arranged in accordance with the inclination of the oil pan joint surface 105A and the crankcase joint surface 103A.

The operation of the internal combustion engine 101 having the above configuration will be described.
The vibration generated in the crankcase 103 when the internal combustion engine 101 is operated is propagated to the oil pan 105 via the joint between the crankcase joint surface 103A and the oil pan joint surface 105A.
At this time, the vibration in the out-of-plane direction in the crankcase 103 is such that the oil pan joint surface 105A is inclined, so that the vibration in the out-of-plane direction with respect to the oil pan joint surface 105A Direction) and vibration.

According to the above configuration, the oil pan joining surface 105A is formed so as to extend in a direction intersecting the direction along the surface of the side plate 111, so that the sound emitted from the oil pan 105 is reduced. Can do.
Since the oil pan joining surface 105A extends in a direction intersecting the direction along the surface of the side plate 111, a part of the vibration in the out-of-plane direction in the crankcase 103 is converted into the vibration in the in-plane direction of the side plate 111. Is done. Therefore, the side plate 111 is vibrated in the out-of-plane direction due to the remaining vibration. As a result, the acoustic radiation by the side plate 111 is reduced, and the sound emitted from the oil pan 105 can be reduced.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the internal combustion engine of the present embodiment is the same as that of the first embodiment, but the configuration of the oil pan is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the configuration of the oil pan will be described with reference to FIG. 5, and description of other components and the like will be omitted.
FIG. 5 is a partial cross-sectional view illustrating the configuration of the oil pan in the internal combustion engine according to the present embodiment.
In addition, the same code | symbol is attached | subjected about the component same as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 5, the oil pan 205 of the internal combustion engine 201 is a container coupled to the lower part of the crankcase 3 using a bolt 204 or the like, and temporarily uses oil used for lubricating the internal combustion engine 201 therein. It is to be stored.

The oil pan 205 includes a bottom plate 9, a side plate 211, a front plate (not shown), and a rear plate (not shown).
The side plate 211 is a plate extending from the edge of the bottom plate 9 toward the crankcase 3 and forms a part of the side surface of the oil pan 205. A bent portion (suppressing portion) 213 that is bent toward the outside of the oil pan 205 and bent toward the bottom plate 9 is formed at the tip of the side plate 211 on the crankcase 3 side. A joining surface 215 joined to the crankcase 3 and the bolt 204 is formed at the tip of the bent portion 213.
Although not shown, the bent portion 213 is formed on the front plate and the rear plate in the same manner as the side plate 211.

The operation of the internal combustion engine 201 having the above configuration will be described.
Vibration generated in the crankcase 3 when the internal combustion engine 201 is operated is propagated to the oil pan 205 through the joint surface 215.
Since the vibration in the out-of-plane direction of the crankcase 3 is converted into a rotational motion at the bent portion 213, it is not propagated to the side plate 211 or the like, or is attenuated and propagated before the bent portion 213.

According to said structure, the sound emitted from the oil pan 205 can be reduced by forming the bending part 213 in the side plate 211. FIG.
Since the bent portion 213 is rotatable in the direction in which the tip end intersects the surface of the side plate 211, the out-of-plane vibration transmitted from the crankcase 3 is caused by the turning operation of the tip portion. Can be absorbed. That is, by providing the bent portion 213 on the side plate 211 and making the side plate 211 have a flexible structure, vibration in the out-of-plane direction can be absorbed by the bent portion 213. Therefore, the vibration in the out-of-plane direction is not propagated to the side plate 211 on the bottom plate 9 side from the bent portion 213 or is attenuated and propagated to the side plate 211 on the bottom plate 9 side from the bent portion 213. As a result, the acoustic radiation by the side plate 211 is reduced, and the sound emitted from the oil pan 205 can be reduced.

  Since the propagation of vibration from the crankcase 3 to the oil pan 205 is suppressed by the bent portion formed in the side plate 211, the amount of stored oil in the oil pan 205 is not reduced. That is, by providing the side plate 211 with the bent portion, the volume in the oil pan 205 is not affected at all.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the internal combustion engine of the present embodiment is the same as that of the first embodiment, but the configuration of the oil pan is different from that of the first embodiment. Therefore, in the present embodiment, only the configuration periphery of the oil pan will be described with reference to FIGS. 6 to 8, and description of other components and the like will be omitted.
FIG. 6 is a perspective view for explaining the outline of the internal combustion engine according to the present embodiment.
In addition, the same code | symbol is attached | subjected about the component same as 1st Embodiment, and the description is abbreviate | omitted.

As shown in FIG. 6, the internal combustion engine 301 includes a crankcase 303 and an oil pan 305.
The crankcase 303 includes a piston (not shown), an output shaft connected to the piston, and the like.
The oil pan 305 is a container coupled to the lower portion of the crankcase 303 using bolts or the like, and temporarily stores oil used for lubricating the internal combustion engine 301 therein. The oil pan 305 is specifically formed by pressing a metal plate or the like.

FIG. 7 is a perspective view illustrating the configuration of the oil pan of FIG. FIG. 8 is a partial cross-sectional view illustrating the configuration of the oil pan of FIG.
As shown in FIG. 7, the oil pan 305 includes a bottom plate 9, a side plate 311, a front plate (side plate) 313, and a rear plate (side plate) 315.
The side plate 311, the front plate 313, and the rear plate 315 are plates extending from the edge of the bottom plate 9 toward the crankcase 303 and form the side surfaces of the oil pan 305. As shown in FIG. 8, a porous material layer (restraining portion) 317 formed of a porous material is formed on the entire inner surfaces of the side plate 311, the front plate 313, and the rear plate 315. The porous material layer 317 may be fixed to the side plate 311, the front plate 313, and the rear plate 315 with an adhesive, or may be fixed by welding, and is not particularly limited.

Next, the operation of the internal combustion engine 301 having the above configuration will be described.
When the internal combustion engine 301 is operated, vibration is generated in the crankcase 303 due to the movement of the piston, the output shaft, and the like. The vibration in the crankcase 303 includes vibrations of various frequencies, and in particular, vibration that matches the vibration mode of the crankcase 303 becomes significant. Of these vibrations, sound is radiated from the surface in proportion to the speed of vibration in the out-of-plane direction on the surface of the crankcase 303 or the like.
The vibration of the crankcase 303 is propagated to the oil pan 305 coupled to the lower part. However, since the porous material layer 317 is fixed to the inner surface of the side plate 311 and the like of the oil pan 305, the side plate 311 and the like are porous. Compared to the case where the material layer 317 is not provided, vibration is less likely.

According to the above configuration, since the porous material layer 317 is provided, the vibration of the side plate 311 and the like due to the vibration propagated from the crankcase 303 to the oil pan 305 can be suppressed, and the sound emitted from the oil pan 305 is generated. Can be reduced.
The porous material layer 317 can suppress vibration of the side plate 311 and the like, specifically, vibration in the out-of-plane direction of the side plate 311 and the like. Since the acoustic radiation radiated from the surface is proportional to the speed of the out-of-plane vibration, the acoustic radiation is reduced by reducing the out-of-plane vibration of the side plate 311 and the like, and the sound emitted from the oil pan 305 is reduced. be able to. In particular, by providing the porous material layer on the entire inner surface of the side plate, it is possible to further reduce the sound emitted from the oil pan as compared with a method of providing a rib or the like on a part of the side plate. In particular, by providing the porous material layer 317 over the entire inner surface of the side plate 311 or the like, it is possible to further reduce the sound emitted from the oil pan 305 as compared with a method in which a rib or the like is provided on a part of the side plate 311 or the like.

  The porous material layer 317 is provided on the inner surface of the side plate 311 and the like and has a space inside, and oil can be stored in this space. Therefore, the amount of stored oil in the oil pan 305 is not reduced.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG. 9 and FIG.
The basic configuration of the internal combustion engine of the present embodiment is the same as that of the first embodiment, but the configuration of the oil pan is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the configuration of the oil pan will be described using FIG. 9 and FIG. 10, and description of other components will be omitted.
FIG. 9 is a perspective view illustrating the configuration of the oil pan of the internal combustion engine according to the present embodiment. FIG. 10 is a partial cross-sectional view illustrating the configuration of the oil pan of FIG.
In addition, the same code | symbol is attached | subjected about the component same as 1st Embodiment, and the description is abbreviate | omitted.

As shown in FIG. 9, the oil pan 405 of the internal combustion engine 401 includes a bottom plate 9, a side plate 411, a front plate (side plate) 413, and a rear plate (side plate) 415.
The side plate 411, the front plate 413, and the rear plate 415 are plates that extend from the edge of the bottom plate 9 toward the crankcase (see FIG. 6), and form the side surface of the oil pan 405. As shown in FIG. 10, a honeycomb structure layer (restraint portion) 417 formed from a honeycomb structure is formed on the entire inner surfaces of the side plate 411, the front plate 413, and the rear plate 415. The honeycomb structure layer 417 may be fixed to the side plate 411, the front plate 413, and the rear plate 415 with an adhesive, or may be fixed by welding, and is not particularly limited.

Next, the operation of the internal combustion engine 401 having the above configuration will be described.
The vibration generated in the crankcase when the internal combustion engine 401 is operated is propagated to the oil pan 405 coupled to the lower portion. The honeycomb structure layer 417 is fixed to the inner surface of the side plate 411 and the like of the oil pan 405. Therefore, the side plates 411 and the like are less likely to vibrate compared to the case where the honeycomb structure layer 417 is not provided.

  According to the above configuration, by providing the honeycomb structure layer 417, vibration of the side plate 411 and the like due to vibration propagated from the crankcase to the oil pan 405 can be suppressed, and sound emitted from the oil pan 405 is reduced. be able to. In addition, the honeycomb structure layer 417 can more effectively restrain vibrations in the out-of-plane direction of the side plate 411 and the like, and further reduce the sound emitted from the oil pan 405, compared to the porous material layer 317. Can do.

The honeycomb structure layer 417 has a space inside, and oil can be stored in this space. Therefore, the amount of stored oil in the oil pan 405 is not reduced.
Since the honeycomb structure layer 417 has a regular arrangement as compared with the porous material layer 317, the honeycomb structure layer 417 is easily provided on the inner surface of the side plate 411 or the like.

1 is a perspective view illustrating an outline of an internal combustion engine according to a first embodiment of the present invention. It is a perspective view explaining the structure of the oil pan of FIG. It is a perspective view explaining the structure of the internal combustion engine which concerns on the 2nd Embodiment of this invention. It is a fragmentary sectional view explaining the structure of the oil pan of FIG. It is a fragmentary sectional view explaining the structure of the oil pan in the internal combustion engine which concerns on the 3rd Embodiment of this invention. It is a perspective view explaining the outline of the internal combustion engine which concerns on the 4th Embodiment of this invention. It is a perspective view explaining the structure of the oil pan of FIG. It is a fragmentary sectional view explaining the structure of the oil pan of FIG. It is a perspective view explaining the structure of the oil pan of the internal combustion engine which concerns on the 5th Embodiment of this invention. It is a fragmentary sectional view explaining the structure of the oil pan of FIG.

Explanation of symbols

1, 101, 201, 301, 401 Internal combustion engine 3, 103, 303 Crankcase 5, 105, 205, 305, 405 Oil pan 9 Bottom plate 11, 111, 211, 311, 411 Side plate 19 Edge portion (suppressing portion)
105A Oil pan joint surface (joint surface, suppression part)
213 Bent part (suppressing part)
313,413 Front plate (side plate)
315, 415 Rear plate (side plate)
317 Porous material layer (restraint part)
417 Honeycomb structure layer (restraint part)

Claims (5)

A bottom plate disposed opposite to the crankcase;
A side plate extending from the edge of the bottom plate toward the crankcase,
The edge of the side plate on the side of the crankcase is formed as a sinusoidal curved shape in a side view, and is formed with a suppressing portion that suppresses vibration propagation from the crankcase to the side plate. Oil pan to do. Claim wavelength curved shape of the edge, characterized in that for a wavelength lambda of a vibration mode of the crankcase at the time of sound of a predetermined frequency is generated, lambda / 2 or more, the wavelength of lambda less The oil pan according to 1 . The oil pan according to claim 1 , wherein the wavelength of the curved shape of the edge is determined so that a resonance frequency in the oil pan is different from a resonance frequency in the crankcase. A bottom plate disposed opposite to the crankcase;
A side plate extending from the edge of the bottom plate toward the crankcase,
The edge of the side plate on the crankcase side is bent toward the outside and bent toward the bottom plate, and the vibration from the out-of-plane direction of the crankcase is converted into a rotational motion by moving the crankcase from the crankcase. An oil pan, characterized in that a bent portion having a joint surface to be joined to the crankcase is formed while suppressing propagation of vibration to a side plate. A crankcase,
An oil pan according to any one of claims 1 to 4 ,
An internal combustion engine comprising:

Images