JP2011032935A - Oil pan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively reduce noise generated from a power unit by using an oil pan provided in the power unit. <P>SOLUTION: This oil pan 1 includes an oil storage section 10 formed into a shape opened to the side of the power unit and storing oil circulating in the power unit, and a chamber forming section 20 sectionally forming a chamber R in the oil storage section 10. The wall of the chamber forming section 20 is formed with openings B1-B6 opened to face the oil storage section 10 and communicating with the chamber R. The chamber R is so configured that the noise radiated from the power unit toward the oil storage section 10 is reduced by a resonance effect. The chamber forming section 20 is integrated with the wall of the oil storage section 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil pan provided in a power unit, and particularly belongs to the technical field of a structure for reducing noise generated from a power unit.

  Conventionally, a power device having a structure in which oil circulates has been provided with an oil pan for temporarily storing oil, and a structure that uses an oil pan to reduce noise generated from the power device is known. (For example, refer to Patent Document 1). A sound insulation cover is attached to the outside of the oil pan of Patent Document 1. A silencer chamber is formed between the sound insulation cover and the oil pan, and noise is reduced by resonating sound in this chamber.

JP 2000-45789 A

  By the way, since the oil pan is provided so as to cover a part of the power unit, noise generated in the power unit is radiated toward the oil pan. Therefore, even if a sound insulation cover is provided outside the oil pan as in Patent Document 1, the noise radiated from the power device as the sound source cannot be directly reduced, and the oil pan vibrates due to the radiated noise. However, the sound radiated to the outside of the oil pan due to the vibration can only be reduced. Further, when the oil pan vibrates, the vibration is transmitted to other members and the like, and the member may become a new noise source. Therefore, as shown in Patent Document 1, a silencer chamber is provided outside the oil pan. It is conceivable that the noise reduction effect is not sufficient only by providing it.

  The present invention has been made in view of such points, and an object of the present invention is to enable noise generated from the power unit to be effectively reduced using an oil pan provided in the power unit. is there.

  1st invention is an oil pan provided in a power unit, which is formed in a shape that opens to the power unit side and stores oil circulating in the power unit, and a chamber in the oil storage unit A chamber forming portion for partitioning and forming an opening in the wall portion of the chamber forming portion so as to face the oil storage portion and communicating with the chamber. The noise radiated from the oil reservoir toward the oil reservoir is reduced by a resonance effect, and the chamber forming portion is integrated with the wall of the oil reservoir.

  A second invention is characterized in that, in the first invention, a part of the wall portion of the chamber forming portion is constituted by the wall portion of the oil storage portion.

  According to a third invention, in the first or second invention, the oil reservoir is configured by combining the first divided body and the second divided body, and the first divided body includes a part of the chamber forming portion. A first chamber constituent part is formed, and a second chamber constituent part constituting another part of the chamber forming part is formed on the second divided body, and the first and second chamber constituent parts are combined. The chamber forming part is configured.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the oil reservoir is formed with a rib protruding into the oil reservoir, and a part of the wall portion of the chamber forming portion is constituted by the rib. It is characterized by being.

  According to a fifth invention, in any one of the first to fourth inventions, a partition wall for partitioning the chamber is formed inside the chamber forming portion.

  According to the first invention, when noise is radiated from the power unit into the oil reservoir, the sound wave enters the chamber through the opening of the chamber forming part and resonates, and the sound energy of the noise becomes thermal energy. Since the sound energy is reduced by the conversion, the noise radiated from the power unit can be directly reduced. Therefore, it can suppress that the wall part of an oil storage part vibrates, and can also suppress that other members vibrate. Furthermore, since the chamber forming part is integrated with the wall part of the oil storage part, the rigidity of the wall part of the oil storage part is improved and it is difficult to vibrate. By these things, noise can be reduced effectively.

  According to the second invention, since a part of the wall portion of the chamber forming portion is configured by the wall portion of the oil storage portion, the chamber forming portion and the oil storage portion are firmly integrated, and the oil storage portion The vibration of the wall can be sufficiently suppressed by further increasing the rigidity of the wall.

  According to the third invention, since the chamber forming part can be obtained by combining the first chamber constituting part and the second chamber constituting part, a hollow chamber forming part can be obtained easily. Further, by changing the shape of the first chamber component or the second chamber component, the volume of the chamber can be easily changed to selectively reduce noise in an arbitrary frequency band.

  According to the fourth invention, since the wall portion of the chamber forming portion is configured using the ribs that reinforce the oil storage portion, the rigidity of the chamber forming portion can be improved and the vibration of the wall portion can be suppressed.

  According to the fifth aspect, it is possible to selectively reduce noise in an arbitrary frequency band by changing the volume of the chamber forming portion. Moreover, the rigidity of a chamber formation part can be improved by providing a partition wall, and a noise can also be reduced by this.

1 is a perspective view of an oil pan according to Embodiment 1. FIG. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. FIG. 3 is a diagram corresponding to FIG. 2 according to a first modification of the first embodiment. FIG. 3 is a diagram corresponding to FIG. 2 according to a second modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 3 according to a second modification of the first embodiment. FIG. 3 is a view corresponding to FIG. 1 according to the second embodiment. It is sectional drawing in the VIII-VIII line of FIG. It is sectional drawing in the IX-IX line of FIG. FIG. 10 is a view corresponding to FIG. 1 according to the third embodiment. It is sectional drawing in the XI-XI line of FIG. FIG. 12 is a diagram corresponding to FIG. 11 according to a modification of the third embodiment. FIG. 10 is a view corresponding to FIG. 1 according to a fourth embodiment. It is sectional drawing in the XIV-XIV line | wire of FIG. It is sectional drawing in the XV-XV line | wire of FIG. FIG. 6 is a diagram corresponding to FIG. 1 according to a first modification of the first embodiment. FIG. 6 is a view corresponding to FIG. 1 according to a second modification of the first embodiment. It is a longitudinal cross-sectional view of the oil pan concerning the modification 3 of Embodiment 4. FIG. It is a longitudinal cross-sectional view of the oil pan concerning the modification 4 of Embodiment 4. It is sectional drawing in the XVIII-XVIII line | wire of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows an oil pan 1 according to an embodiment of the present invention. Although not shown, the oil pan 1 is provided in a lower portion of an automobile engine (power unit), and has an oil storage unit 10 for temporarily storing oil circulating inside the engine, and an oil storage. The chamber 10 is provided with a chamber forming portion 20 for partitioning and forming a noise reducing chamber R. As shown in FIGS. 2 and 3, the oil pan 1 is configured by combining an upper member 2 and a lower member 3. Between the upper member 2 and the lower member 3, a chamber forming portion 20 is provided. The intermediate plate 4 as another member constituting the bottom wall portion 24 is disposed substantially horizontally. That is, the oil pan 1 consists of three parts.

  The oil reservoir 10 is formed in a substantially rectangular box shape that opens upward (engine side), and is long in the direction in which the crankshaft of the engine extends.

  The oil reservoir 10 includes a substantially rectangular bottom wall 11 and a peripheral wall 12 that rises from the peripheral edge of the bottom wall 11. A flange 13 extending outward is formed on the upper edge of the peripheral wall 12 continuously in the circumferential direction. A plurality of bolt insertion holes 13 a penetrating in the vertical direction are formed in the flange 13. The oil pan 1 is fixed to the engine by screwing bolts (not shown) inserted through the respective bolt insertion holes 13a into cylinder cylinder blocks of the engine.

  The lower member 3 is formed by molding a resin material. In the lower member 3, a bottom wall portion 11 of the oil storage portion 10 and a lower portion 12a of the peripheral wall portion 12 are integrally formed. A lower side joint portion 14 that protrudes outward and extends in the circumferential direction is formed on the upper edge portion of the lower portion 12a of the peripheral wall portion 12.

  A support plate portion 15 for supporting the intermediate member 4 from below is integrally formed on the bottom wall portion 11 of the lower member 3 so as to extend upward. The support plate portion 15 is spaced inward from the inner surface of the peripheral wall portion 12 and is formed so as to form a ring substantially parallel to the peripheral wall portion 12. The upper end portion of the support plate portion 15 is located at substantially the same height as the lower side joint portion 14. As shown in FIG. 2, the space | interval of the support plate part 15 and the inner surface of the lower part 12a of the surrounding wall part 12 is set so that the width direction one side of the oil pan 1 may become narrow compared with the other side.

  A through-hole 15 a that penetrates the support plate 15 in the thickness direction is formed in the lower portion of the support plate 15. The space inside the support plate portion 15, that is, the space surrounded by the support plate portion 15, and the space outside the support plate portion 15 communicate with each other through the through hole 15 a. The support plate portion 15 also functions as a rib for reinforcing the lower member 3 and can particularly improve the rigidity of the bottom wall portion 11 of the lower member 3.

  The upper member 2 is formed by molding a resin material in the same manner as the lower member 3. In the upper member 2, an upper portion 12 b of the peripheral wall portion 12 of the oil storage portion 10 and a portion other than the bottom wall portion 24 of the chamber forming portion 20 are integrally formed. An upper side joint portion 17 to be joined to the lower side joint portion 14 is formed on the lower edge portion of the upper portion 12 b of the peripheral wall portion 12. The upper side joint portion 17 projects outward from the upper portion 12b of the peripheral wall portion 12, and projects downward to extend in the circumferential direction. The lower surface of the upper side joint portion 17 is welded to the upper surface of the lower side joint portion 14 using a welding method such as vibration welding over the entire circumference. As a result, oil is prevented from leaking from between the upper member 2 and the lower member 3. The upper side joint portion 17 and the lower side joint portion 14 may be welded by, for example, a welding method such as hot plate welding or may be bonded by an adhesive.

  On the inner peripheral side of the upper side joint portion 17, an outer stepped portion 17 a is formed over the entire circumference so that the outer peripheral portion of the intermediate plate 4 fits.

  As shown in FIG. 1, the chamber forming portion 20 is formed so as to form a tube extending in an annular shape along the inner surface of the peripheral wall portion 12 of the oil reservoir 10, and is intermediate in the vertical direction (depth direction) of the oil reservoir 10. Located in the department. The inside of the chamber forming unit 20 is a chamber R. The chamber R is partitioned into first to seventh chambers R1 to R7, details of which will be described later.

  As shown in FIG. 2, the chamber forming portion 20 has a substantially rectangular longitudinal section, and includes an upper wall portion 21, an outer peripheral wall portion 22, an inner peripheral wall portion 23, and a bottom wall portion 24.

  The upper wall portion 21 of the chamber forming portion 20 has a ring shape that extends substantially horizontally from the vicinity of the upper portion 12 b of the peripheral wall portion 12 of the oil storage portion 10 toward the inside of the oil storage portion 10 and along the peripheral wall portion 12. It extends to make. The inner peripheral wall portion 23 extends substantially vertically downward from the inner edge of the upper wall portion 21. An inner joint portion 25 to be joined to the support plate portion 15 is formed at the lower edge portion of the inner peripheral wall portion 23. The inner joint portion 25 has a shape that protrudes from the inner peripheral wall portion 23 toward the inside of the oil storage portion 10 and extends in the circumferential direction. The lower surface of the inner joint portion 25 is welded to the upper end portion of the support plate portion 15 using a welding method such as vibration welding. The inner joint portion 25 is formed with an inner step portion 25a having a shape into which the inner peripheral portion of the intermediate plate portion 4 is fitted. The inner step portion 25a and the outer step portion 17a are located at the same height.

  Further, the outer peripheral wall portion 22 of the chamber forming portion 20 is constituted by a part of the upper portion 12 b of the peripheral wall portion 12.

  As shown by broken lines in FIG. 1, first to seventh partition walls A1 to A7 extending in the vertical direction are formed at intervals in the circumferential direction inside the chamber forming portion 20, and these partition walls A1 The seventh to seventh chambers R are partitioned into first to seventh chambers R1 to R7. The first to seventh partition walls A1 to A7 are arranged at unequal intervals, and the volumes of the first to seventh chambers R1 to R7 are different from each other. The first to seventh partition walls A1 to A7 are integrally formed with the upper wall portion 21, the outer peripheral wall portion 22 and the inner peripheral wall portion 23, and the lower edge portions of the first to seventh partition walls A1 to A7 are intermediate. Each is in contact with the upper surface of the plate 4.

  First to seventh openings B1 to B7 communicating with the first to seventh chambers R1 to R7 are formed on the upper wall portion 21 of the chamber forming portion 20, and these first to seventh openings B1 are formed. ~ B7 faces the oil reservoir 10. The diameters of the first to seventh openings B1 to B7 are different from each other. Moreover, the annular protrusion part 27 which protrudes upwards is formed in the peripheral part of 1st-7th opening part B1-B7, respectively. The vertical dimensions of these annular protrusions 27 are different from each other.

  The first opening B1 and the first chamber R1 constitute one Helmholtz resonator. Similarly, the second opening B2 and the second chamber R2, the third opening B3, the third chamber R3, and the fourth opening. Helmholtz resonators are configured by B4 and the fourth chamber R4, the fifth opening B5 and the fifth chamber R5, the sixth opening B6 and the sixth chamber R6, and the seventh opening B7 and the seventh chamber R7, respectively. In the embodiment, a total of seven Helmholtz resonators are present in the oil reservoir 10.

  As is well known, the frequency band of sound resonating with each Helmholtz resonator is the volume of the Helmholtz resonator, the volume of the first to seventh chambers R1 to R7, the vertical dimension of the first to seventh openings B1 to B7, and It can be changed depending on the opening diameter. In this embodiment, each Helmholtz resonator is designed so as to resonate with noise in a frequency band that is particularly uncomfortable for the occupant among engine noise.

  The volumes of the first to seventh chambers R1 to R7 may be the same. Similarly, the vertical dimension and diameter of the first to seventh openings B1 to B7 may be the same.

  The intermediate plate 4 constitutes the bottom wall portion 24 of the chamber forming portion 20 as described above, and is formed by molding a resin material. The intermediate plate 4 has an annular shape corresponding to the shape of the chamber R. The width of the intermediate plate 4 is set to be approximately the same as the interval between the inner step portion 25a and the outer step portion 17a. The inner peripheral portion of the intermediate plate 4 is fitted into the inner stepped portion 25a, and the outer peripheral portion is fitted into the outer stepped portion 17a. In this state, the intermediate plate 4 has a posture extending substantially horizontally.

  The inner peripheral portion of the intermediate plate 4 is supported from below by the upper end portion of the support plate portion 15 in a state of being fitted to the inner step portion 25a, and the outer peripheral portion of the intermediate plate 4 is in a state of being fitted to the outer step portion 17a. It is supported from below by the upper end portion of the lower portion 12a of the peripheral wall portion 12. That is, as for the intermediate | middle board 4, an inner peripheral part and an outer peripheral part are each clamped by the up-down direction.

  The inner peripheral portion and the outer peripheral portion of the intermediate plate 4 may be welded to the upper member 2 and the lower member 3. By welding, the upper member 2 and the lower member 3 and the intermediate plate 4 can be firmly integrated, and the strength of the oil pan 1 as a whole can be improved.

  A plurality of oil discharge holes 4 a are formed in the intermediate plate 4 so as to penetrate in the vertical direction when oil is accumulated in the chamber R. The diameter of the oil discharge hole 4a is set to be sufficiently smaller than the diameters of the first to seventh openings B1 to B7, so that the resonance effect of the Helmholtz resonator is not impaired. The oil discharge hole 4a may be constituted by a slit. Alternatively, a cutout may be formed in the intermediate plate 4 and the oil discharge hole may be configured using this cutout.

  Next, the case where the oil pan 1 configured as described above is used by being attached to an engine will be described. Although not shown, an oil suction pipe is provided in the oil storage section 10 of the oil pan 1, and oil is sucked from the oil suction pipe and circulates through each part of the engine.

  The oil circulated through each part of the engine is returned to the oil reservoir 10 from an oil return pipe (not shown). The downstream end of the oil return pipe is positioned above the oil reservoir 10 and in the inner portion of the oil reservoir 10 than the chamber forming portion 20. Accordingly, the oil is mainly returned to the space inside the support plate portion 15.

  During engine operation, noise is radiated from the cylinder block into the oil reservoir 10. The sound waves enter the first to seventh chambers R1 to R7 through the first to seventh openings B1 to B7 of the chamber forming unit 20 and resonate using air as a medium, and the sound energy of noise is converted into thermal energy. As a result, the sound energy is reduced. Thereby, the noise radiated | emitted from the engine can be reduced directly and it can suppress that the bottom wall part 11 and the surrounding wall part 12 of the oil storage part 10 vibrate. As a result, vibrations of other members around the oil pan 1 can also be suppressed.

  Furthermore, since the chamber formation part 20 is integrated with the peripheral wall part 12 of the oil storage part 10, the rigidity of the peripheral wall part 12 of the oil storage part 10 improves, and it becomes difficult to vibrate.

  Moreover, the oil dripped from the upper part of the oil storage part 10 may enter 1st-7th opening part B1-B7. The oil that has entered the first to seventh openings B1 to B7 enters the first to seventh chambers R1 to R7, but the oil that has entered the first to seventh chambers R1 to R7 The oil is discharged downward from the oil discharge hole 4 a, passes through the through hole 15 a of the support plate portion 15, and is returned to the space inside the support plate portion 15. Therefore, the first to seventh chambers R1 to R7 are not filled with oil.

  As described above, according to the oil pan 1 according to the first embodiment, noise radiated from the engine toward the oil reservoir 10 can be directly reduced, and the bottom wall 11 and the peripheral wall of the oil reservoir 10 can be reduced. It can suppress that the part 12 vibrates. Furthermore, since the chamber forming part 20 is integrated with the peripheral wall part 12 of the oil storage part 10 and the rigidity of the peripheral wall part 12 of the oil storage part 10 is improved, vibration of the peripheral wall part 12 can be suppressed. By these things, noise can be reduced effectively.

  Further, since the outer peripheral wall portion 22 of the chamber forming portion 20 is configured by the peripheral wall portion 12 of the oil storage portion 10, the chamber forming portion 20 and the oil storage portion 10 can be firmly integrated, and the rigidity of the oil storage portion 10 can be further increased. The vibration of the peripheral wall portion 12 can be sufficiently suppressed by further increasing.

  Moreover, since partition wall A1-A7 was provided in the chamber formation part 20, the rigidity of the chamber formation part 20 can be improved, and a noise can also be reduced by this.

  Further, since the upper wall portion 21 of the chamber forming portion 20 functions as a rib of the upper member 2, the rigidity of the oil pan 1 can be improved.

  In the first embodiment, the chamber forming portion 20 is formed in an annular shape so as to be along the inner surface of the peripheral wall portion 12 of the oil storage portion 10, and the central portion is formed so as to penetrate in the vertical direction. The central portion may be closed. As a closing method, the upper wall portion 21 of the chamber forming portion 20 may be extended to the center portion, or a closing plate or the like as another member may be attached. Further, when the central portion is closed as described above, a hole for allowing oil to flow downward is provided in the closed portion.

  Further, as in Modification 1 shown in FIG. 4, the annular protrusion 27 on the peripheral edge of the first opening B <b> 1 may be protruded below the upper wall 21. The same applies to the annular protrusions 27 of the second to seventh openings B2 to B7. By projecting the annular protrusion 27 downward, when the obstacle X is above the chamber forming part 20, the vertical dimension of the annular protrusion 27 can be ensured long while avoiding the obstacle X.

  In the first modification, the annular projecting portion 27 at the peripheral edge of the sixth opening B <b> 6 is projected in both the upper and lower directions of the upper wall portion 21. The annular protrusions 27 of the first to fifth and seventh openings B1 to B5 and B7 can be made the same.

  Moreover, you may form the bulging part 30 which bulges downward in the intermediate | middle board 4 like the modification 2 shown in FIG.5 and FIG.6. The bulging part 30 is formed in the site | part corresponding to the bottom wall part 24 of 1st-7th chamber R1-R7, respectively, and the volume of 1st-7th chamber R1-R7 is formed by formation of the bulging part 30. Can be enlarged. The oil discharge hole 4 a is formed in the bulging portion 30. By changing the bulging amount of the bulging portion 30, the volumes of the first to seventh chambers R1 to R7 can be made different from each other. The bulging portion 30 may be formed so as to correspond to the bottom wall portion 24 of any one of the first to seventh chambers R1 to R7.

(Embodiment 2)
7 to 9 show an oil pan 1 according to Embodiment 2 of the present invention. The oil pan 1 according to the second embodiment is different from that according to the first embodiment in the number of chambers R and the positions where the openings communicating with the chambers are formed. The same reference numerals are assigned to the same parts, and the description thereof is omitted. Different parts will be described in detail.

  That is, in Embodiment 2, the chamber R is partitioned by the first to fifth partition walls A1 to A5. Accordingly, the first to fifth chambers R1 to R5 are formed in the chamber forming portion 20. The first to fifth openings B <b> 1 to B <b> 5 are formed in the inner peripheral wall portion 23 of the chamber forming portion 20, and the annular projecting portion 27 is also formed in the inner peripheral wall portion 23. In this Embodiment 2, since each annular protrusion 27 protrudes in a substantially horizontal direction, it is difficult for oil dropped from above to enter the first to fifth openings B1 to B5.

  Therefore, according to the oil pan 1 of the second embodiment, the noise radiated from the engine toward the oil reservoir 10 can be directly reduced by the chamber R as in the first embodiment, and the oil reservoir 10 It can suppress that the surrounding wall part 12 vibrates. Furthermore, since the chamber forming part 20 is integrated with the peripheral wall part 12 of the oil storage part 10 and the rigidity of the peripheral wall part 12 of the oil storage part 10 is improved, vibration of the peripheral wall part 12 can be suppressed. By these things, noise can be reduced effectively.

  In the second embodiment, an opening and an annular protrusion may be formed on the upper wall portion 21 of the chamber forming portion 20 as in the first embodiment.

  Further, the number of chambers formed in the chamber forming unit 20 is not limited to the above-described number.

(Embodiment 3)
10 and 11 show an oil pan 1 according to Embodiment 3 of the present invention. The oil pan 1 of the third embodiment is such that oil is allowed to actively flow into the chamber R, an oil suction pipe 38 is provided in the oil pan 1, and an intermediate plate 4 is omitted. Therefore, the portions different from those in the first embodiment will be described in detail below.

  That is, the oil pan 1 according to the third embodiment includes an upper member 2 and a lower member 3. A plate portion 36 extending substantially parallel to the bottom wall portion 11 is formed at the lower portion of the upper member 2. By providing the plate portion 36 on the upper member 2, the rigidity of the upper member 2 can be increased.

  The plate portion 36 is formed with an oil circulation hole 36a penetrating in the vertical direction. The oil dropped on the upper surface of the plate portion 36 flows through the oil circulation hole 36a and flows downward.

  In addition, an upper chamber constituent part (first chamber constituent part) 37 constituting the upper part of the chamber forming part 20 is formed on the plate part 36. The upper chamber constituting portion 37 is formed by bulging the plate portion 36 upward, and an opening B that opens to face the oil storage portion 10 is formed on the upper wall portion. Further, the lower part of the upper chamber constituting part 37 is open. An annular projecting portion 27 projecting upward is formed at the peripheral edge of the opening B of the upper wall portion of the upper chamber constituting portion 37. In this embodiment, the chamber R is composed of one room.

  An oil suction pipe 38 is formed in the plate portion 36. The oil suction pipe 38 protrudes in both the upper and lower directions of the plate portion 36, and a pipe communicating with the suction side of the oil pump (not shown) is connected to the upper end portion.

  On the other hand, a lower chamber constituent part (second chamber constituent part) 40 constituting the lower part of the chamber forming part 20 is formed on the bottom wall part 11 of the lower member 3. The lower chamber constituting portion 40 is configured by a rib that protrudes upward from the bottom wall portion 11 and extends in an annular shape, and an upper end portion thereof coincides with a lower end portion of the upper chamber constituting portion 37. A through hole 40 a communicating with the chamber R is formed in the lower portion of the lower chamber constituting portion 40.

  In the third embodiment, the oil is stored below the plate portion 36, is sucked from the oil suction pipe 38, circulates through each part of the engine, and is returned to the upper surface of the plate portion 36. The oil returned to the upper surface of the plate part 36 flows below the plate part 36 through the oil circulation hole 36a. The oil below the plate portion 36 flows into the chamber R from the through hole 40 a of the lower chamber constituting portion 40. The amount of air in the chamber R changes depending on the amount of oil flowing in, and as a result, the resonant frequency band changes. That is, the frequency band in which noise can be reduced can be positively controlled by the oil surface height.

  Further, the upper chamber constituting portion 37 is integrated with the peripheral wall portion 12 of the oil reservoir 10 via the plate portion 36, and the lower chamber constituting portion 40 that is a rib constitutes the side wall of the oil reservoir 10. The rigidity of the peripheral wall 12 and the bottom wall 11 of the oil reservoir 10 can be sufficiently increased.

  Therefore, according to the oil pan 1 of the third embodiment, the noise radiated from the engine toward the oil reservoir 10 can be directly reduced, as in the first embodiment, and the peripheral wall portion of the oil reservoir 10 can be reduced. It can suppress that 12 vibrates. Furthermore, since the chamber forming part 20 is integrated with the peripheral wall part 12 of the oil storage part 10 and the rigidity of the peripheral wall part 12 of the oil storage part 10 is improved, vibration of the peripheral wall part 12 can be suppressed. By these things, noise can be reduced effectively.

  Further, since the upper chamber constituting portion 37 and the lower chamber constituting portion 40 are combined to constitute the chamber R, the hollow chamber forming portion 20 can be easily obtained.

  Note that the plate portion 36 may be separated from the upper member 2 as in the modification shown in FIG. Thereby, the freedom degree of the shape setting of the upper chamber structure part 37 and the oil suction pipe 38 can be raised.

  In the third embodiment, a plurality of chambers R can be provided.

(Embodiment 4)
FIGS. 13-15 shows the oil pan 1 concerning Embodiment 4 of this invention. The oil pan 1 of the fourth embodiment differs from that of the first embodiment in that an oil return pipe 46 and an oil suction pipe 47 are provided, and the shape of the chamber R. Different parts will be described in detail.

  The chamber R is formed in a wide range so as to cover substantially the entire bottom wall 11 of the oil reservoir 10 from above. Inside the chamber forming portion 20, first to sixth partition walls A1 to A6 that partition the chamber R into first to sixth chambers R1 to R6 are provided. The upper wall 21 is formed with first to sixth openings B1 to B6 corresponding to the first to sixth chambers R1 to R6 of the chamber R, and the first to sixth openings B1 to B6. An annular protrusion 27 protruding upward from the peripheral edge is formed.

  Further, as shown in FIG. 14, an oil circulation hole 45 extending downward is formed in the upper wall portion 21 of the chamber forming portion 20, and the oil circulation hole 45 is a through hole 4 b formed in the intermediate plate 4. It communicates with the space below the intermediate plate 4 via

  As shown in FIG. 15, the oil return pipe 46 is formed integrally with the upper wall portion 21 and protrudes in both the upper and lower directions of the upper wall portion 21. The lower end portion of the oil return pipe 46 communicates with a space below the intermediate plate 4 through the through hole 4 b of the intermediate plate 4.

  The oil suction pipe 47 is also integrally formed with the upper wall portion 21 and protrudes in both the upper and lower directions of the upper wall portion 21. The intermediate plate 4 is formed with a pipe portion 4 c for communicating the oil suction pipe 47 with a space below the intermediate plate 4. The pipe part 4 c extends downward from the intermediate plate 4, and the lower end part is located in the vicinity of the bottom wall part 11 of the oil storage part 10.

  In the fourth embodiment, the oil circulated through the engine is returned from the oil return pipe 46 to the oil reservoir 10 and then sucked from the oil suction pipe 47.

  Further, since the upper wall portion 21 of the chamber forming portion 20 is integrated with the peripheral wall portion 12 of the oil storage portion 10, the rigidity of the peripheral wall portion 12 is increased.

  Therefore, according to the oil pan 1 of the fourth embodiment, as in the first embodiment, noise radiated from the engine toward the oil reservoir 10 can be directly reduced, and the peripheral wall portion of the oil reservoir 10 can be reduced. It can suppress that 12 vibrates. Furthermore, since the chamber forming part 20 is integrated with the peripheral wall part 12 of the oil storage part 10 and the rigidity of the peripheral wall part 12 of the oil storage part 10 is improved, vibration of the peripheral wall part 12 can be suppressed. By these things, noise can be reduced effectively.

  Further, as in Modification 1 shown in FIG. 16, the second, fourth, and fifth partition walls A <b> 2, A <b> 4, and A <b> 5 are protruded upward from the upper wall portion 21 of the chamber forming portion 20, 12 may be integrated. Accordingly, the second, fourth, and fifth partition walls A2, A4, and A5 function as ribs of the upper wall portion 21, and the rigidity of the oil pan 1 can be increased. The second partition wall A2 extends in the minor axis direction of the oil reservoir 10, and is formed so as to connect the vicinity of the bolt insertion holes 13a, 13a on both sides of the flange 13 in the minor axis direction. The fourth and fifth partition walls A5 extend in the longitudinal direction of the oil reservoir 10, and are formed so as to connect the vicinity of the bolt insertion holes 13a and 13a on both sides of the flange 13 in the longitudinal direction. Since the bolt insertion hole 13a is fastened to the engine, the strength is high, and by connecting the vicinity of the high bolt insertion hole 13a with the second, fourth and fifth partition walls A2, A4, A5, The effect of reinforcing the oil pan 1 is sufficiently obtained. The projecting heights of the second, fourth, and fifth partition walls A2, A4, and A5 may be set so that the center side of the oil reservoir 10 is lowered, and in this way, the engine interior is located above the oil reservoir 10. If there are other parts, interference with the parts can be avoided. The first and third partition walls A1 and A3 may also protrude upward like the second partition wall A2.

  Moreover, you may form the upper wall part 21 of the chamber formation part 20 in the shape of a mortar so that the center part may be located lowest like the modification 2 shown in FIG. That is, the peripheral edge portion of the upper wall portion 21 is located in the vicinity of the upper surface of the flange 13 over the entire periphery, and is formed so as to incline downward from there toward the central portion. This makes it possible to lower the position of the annular projecting portion 27 in the vicinity of the center portion of the upper wall portion 21 as compared with the peripheral edge portion of the upper wall portion 21. Interference with parts can be avoided. Further, in the second modification, as in the first modification, the first to fifth partition walls A1 to A5 may be protruded upward to connect the vicinity of the bolt insertion holes 13a of the flange 13 to each other.

  Further, as in the third modification shown in FIG. 18, the oil other than the opening B of the chamber R may be sealed using the oil that has flowed into the chamber R. That is, the intermediate plate 4 is formed with a communication hole 50 communicating with a space below the intermediate plate 4 and an annular groove 51 extending so as to surround the communication hole 50. The height of the inner peripheral wall 51a of the annular groove 51 is set lower than the height of the outer peripheral wall 51b. In the annular groove 51, oil that has entered from the opening B is accumulated.

  On the other hand, the upper member 2 is formed with a vertical plate portion 53 extending downward from the upper wall portion 21. The vertical plate portion 53 has a tubular shape larger than the communication hole 50, and a lower end portion thereof is inserted into the annular groove 51.

  In the third modification, when oil flows into the annular groove 51 and the lower end portion of the vertical plate portion 53 is immersed in the oil in the annular groove 51, the oil is between the lower end portion of the vertical plate portion 53 and the inner surface of the annular groove 51. Sealed by. Thereby, compared with the case where it is not sealed, the volume of the chamber R becomes small and the frequency band of the sound to resonate changes. When the oil in the chamber R becomes excessive, the oil flows out from the communication hole 50 beyond the inner peripheral wall 51a of the annular groove 51.

  Further, as in Modification 4 shown in FIGS. 19 and 20, the chamber R is partitioned into first and second chambers R1 and R2, and the first and second chambers R1 and R2 form long passages, respectively. The plates 55 and 56 may be provided inside the first and second chambers R1 and R2. Moreover, in this modification 4, the cross-sectional areas are set to be substantially the same from one end in the length direction to the other end of the first and second chambers R1, R2. When the plates 55 and 56 are provided inside the first and second chambers R1 and R2, the sound silencing effect in the high frequency region is enhanced as compared with the case where the plates 55 and 56 are not provided.

  Moreover, although the said Embodiment 1-4 demonstrated the oil pan 1 provided in an engine, it is not restricted to this, For example, it is also possible to apply this invention to the oil pan provided in the automatic transmission of a motor vehicle. The present invention can be applied to oil pans for various power machines.

  The chamber forming unit 20 can also be provided at the upper end of the oil storage unit 10.

  As described above, the oil pan according to the present invention can be provided, for example, in an engine mounted on an automobile.

1 Oil pan 2 Upper member (first divided body)
3 Lower member (second divided body)
DESCRIPTION OF SYMBOLS 10 Oil storage part 11 Bottom wall part 12 Perimeter wall part 20 Chamber formation part 21 Upper wall part 23 Inner peripheral wall part 24 Outer peripheral wall part 27 Annular protrusion part 37 Upper chamber structure part (1st chamber structure part)
40 Lower chamber component (second chamber component, rib)
A partition wall B opening R chamber

Claims (5)

An oil pan provided in the power unit,
An oil storage portion that is formed in a shape that opens to the power device side and stores oil circulating through the power device;
A chamber forming section for defining a chamber in the oil storage section;
An opening is formed in the wall of the chamber forming portion so as to face the oil reservoir and communicates with the chamber, and the chamber is radiated from the power unit toward the oil reservoir. Configured to reduce noise by the resonance effect,
The oil pan, wherein the chamber forming portion is integrated with a wall portion of the oil storage portion. The oil pan according to claim 1,
An oil pan, wherein a part of a wall portion of the chamber forming portion is constituted by a wall portion of an oil storage portion. The oil pan according to claim 1 or 2,
The oil reservoir is configured by combining the first divided body and the second divided body,
The first divided body is formed with a first chamber constituent part that constitutes a part of the chamber forming part,
In the second divided body, a second chamber constituent part that constitutes another part of the chamber forming part is formed,
An oil pan, wherein the chamber forming part is configured by combining the first and second chamber constituent parts. The oil pan according to any one of claims 1 to 3,
The oil reservoir is formed with ribs that project into the oil reservoir,
An oil pan, wherein a part of a wall portion of the chamber forming portion is constituted by the rib. The oil pan according to any one of claims 1 to 4,
An oil pan, wherein a partition wall for partitioning the chamber is formed inside the chamber forming portion.

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